DOUBLE-CRANKSHAFT VARIABLE COMPRESSION RATIO ENGINE

Abstract

Disclosed is a reciprocating piston engine, comprising a combined structure with an optimized double-crankshaft and variable compression ratio pistons, characterized in that the variable compression ratio piston is a piston serving as a double-acting hydraulic cylinder, a control valve bush of a slide-valve type directional control valve is fixed in a central mounting hole of the inner piston, and a control valve core is mounted in a rotatory sliding or nut-ball screw manner in a central mounting hole in the inner surface of the piston top; and the double-crankshaft engine is formed by two reverse rotating crankshafts which are coupled by gears to be in synchronous reverse rotation motion together, each piston being connected to a connecting rod shaft of two crankshafts, and a piston control valve driving mechanism being mounted between the two crankshafts.

Claims

1. A reciprocating piston engine, comprising an optimized structure in which a double-crankshaft engine is combined with a variable compression ratio piston, wherein the variable compression ratio piston adopts an outer piston as a cylinder sleeve (401) of a double-acting hydraulic cylinder, and a ring-shaped cover plate (403) is fixed on an opening of the cylinder sleeve (401); an inner piston rod (4026) penetrates through the middle of the cover plate (403); the space of the cylinder sleeve is divided by an inner piston (402) of the double-acting hydraulic cylinder into an upper hydraulic cylinder and a lower hydraulic cylinder (4021, 4022); control valve sleeves (502a, 502b, 502c, 502d, 502e, 502f) of a slide-valve-type directional control valve are fixed in a central installation hole (4023) of the inner piston; control valve elements (501a, 501b, 501c, 501d, 501e, 501f) are installed in a central installation hole (4011) on the inner surface of the piston top in a rotating and sliding manner or by virtue of a nut and a lead screw; a drive rod (808) is installed on a control valve element of the slide-valve-type directional valve of a variable compression ratio piston, a slide sleeve (807) sliding rectilinearly is installed on a lower portion of the drive rod, and a rotating drive mechanism (800) is arranged on the lower portion to drive the slide sleeve (807); the double-crankshaft engine is coupled with the crankshafts rotating synchronously in opposite directions through gears; each piston is connected with a connecting rod shaft of the two crankshafts; a position for the drive rod (808, 807) of the variable compression ratio piston to pass through is reserved in the middle of crankshafts and connecting rods of the double-crankshaft engine, and a piston control valve drive mechanism (800) is installed between the two crankshafts; each crankshaft of the double-crankshaft engine is respectively provided with a flywheel (204); when the directional control valve is at a balanced state, the directional valve is at a closed state; when the valve element is rotated and a valve element oil inlet and a valve element oil outlet move up relatively, the valve element oil outlet is communicated with the upper hydraulic cylinder, and the working liquid of the variable compression ratio piston is low-pressure liquid, and lubricating oil of an engine lubricating system is directly used as the working liquid of the variable compression ratio piston.

2. The reciprocating piston engine according to claim 1, characterized in that each crankshaft is respectively provided with a flywheel (204).

3. The reciprocating piston engine according to claim 1, characterized in that a completely symmetric structure is adopted in the scattered flywheels, i.e. each cylinder of the crankshaft is provided with two counterweights, and each counterweight is additionally provided with a flywheel.

4. The reciprocating piston engine according to claim 1, characterized in that the scattered flywheels adopt a weight-reducing structure of embodiment 1, i.e., the two crankshafts corresponding to each air cylinder are respectively provided with a crankshaft arm (203) with a counterweight and a crankshaft arm (204) both with a counterweight and a flywheel, and different crankshaft arms on the two crankshafts are alternately distributed.

5. The reciprocating piston engine according to claim 1, characterized in that the scattered flywheels adopt a weight-reducing structure of embodiment 2, i.e., the two crankshafts corresponding to each air cylinder are respectively provided with a crankshaft arm (203) with a counterweight, and different crankshaft arms on the two crankshafts are alternately distributed.

6. The reciprocating piston engine according to claim 1, characterized in that the piston and the connecting rod are connected through three shafts, and an inner piston push rod (4026) of the piston is in sliding fit with the connecting rod (701) through a three-hole connector to connect the connect rod.

7. The reciprocating piston engine according to claim 1, characterized in that embodiment 1 of a slide-valve-type directional valve control valve of a variable compression ratio piston is: a three-position three-way axis-moving self-pumping variable compression ratio piston control valve; the structure of the main control valve is equivalent to a three-position three-way directional valve; the valve sleeve (502a) is provided with two annular grooves (5022, 5023); an upper annular groove is an upper cylinder annular groove (5022) communicated with the upper hydraulic cylinder; the lower annular groove is a lower cylinder lower annular groove (5023) communicated with the lower hydraulic cylinder; a valve sleeve sealing section (5025) is provided between the upper annular groove and the lower annular groove; a valve element (501a) is of a hollow type; a hydraulic oil outlet (5011) is provided in the middle portion of the valve element; the hydraulic oil outlet (5011) is communicated with a central hole (5012) of the valve element; the hydraulic oil inlet in the middle portion of the valve element may be an independent porous form, and may also be provided with an annular groove; the diameter or the height of the hydraulic oil outlet in the middle portion of the valve element is smaller than or equal to the height (5025) of the valve sleeve sealing section; two ends of the valve element are respectively provided with hydraulic oil inflow holes (5013, 5014); check valves (503, 504) are installed in each hydraulic oil inflow hole; liquid in the check valve flows outwards from the check valve; an outlet of an upper check valve (503) is communicated with the upper hydraulic cylinder, and a lower check valve (504) is communicated with the lower hydraulic cylinder; a check valve (505) is installed on the top of the drive rod of the valve element, and the liquid flow direction of the check valve is from bottom to top; the valve element is installed in the valve sleeve in a sliding manner, the valve sleeve is fixed on the inner piston; the valve element (501a) is installed in the central installation hole (4011) on the inner surface of the piston top by virtue of a nut (4012) and a lead screw (5018); the check valves (503, 504, 505) adopt circlip-type horizontal moving check valves; a safety device is arranged on the piston to eliminate the safety danger when in heat expansion of the hydraulic oil; the control valve element (501a) is provided with a decompression longitudinal hole (5017) for communicating the space of the valve element installation hole (4011) and exterior, and the longitudinal hole (5017) is not communicated with the central hole (5012), thereby reducing the pressure generated by the leakage of little hydraulic oil, and reducing an operating force of the control valve element.

8. The reciprocating piston engine according to claim 1, characterized in that Embodiment 2 of the slide-valve-type directional control valve installed on the variable compression ratio piston is: a three-position three-way spiral-groove self-pumping variable compression ratio piston control valve; a main control valve structure is equivalent to a three-position three-way directional valve; the valve sleeve (502b) is provided with two groups of longitudinal grooves (5022a, 5023a); an upper longitudinal groove is an upper cylinder longitudinal groove (5022a) communicated with the upper hydraulic cylinder, the lower longitudinal groove is a lower cylinder lower longitudinal groove (5023a) communicated with the lower hydraulic cylinder; a sealing section (5025) is provided between the upper longitudinal groove and the lower longitudinal groove; the valve element (501b) is of a hollow type; a hydraulic oil outflow hole (5011) is formed in the middle portion of the valve element and communicated with the central hole (5012) of the valve element; the outer cylindrical surface of the middle portion of the valve element is provided with a spiral groove (5011a); the hydraulic oil outflow hole (5011) in the middle portion of the valve element is disposed in the spiral groove (5011a); at an intersected surface of the valve sleeve longitudinal groove and the spiral groove, when the valve sleeve sealing section is disposed in the middle of the spiral groove, the valve sleeve sealing section (5025) can completely seal the spiral groove (5011a); both ends of the valve element are respectively provided with hydraulic oil inflow holes (5013, 5014); check valves are (503, 504) installed in each hydraulic oil inflow hole (5013, 5014); liquid in the check valve flows outwards from the valve element; an outlet of an upper check valve (503) is communicated with the upper hydraulic cylinder; a lower check valve (504) is communicated with the lower hydraulic cylinder; the check valve (505) is installed on the top of the drive rod of the valve element; the valve element (501b) is installed in the valve sleeve (502b) in a sliding manner; the valve sleeve (502b) is fixed on the inner piston; the valve element (501b) is installed in a central installation hole (4011) of the inner surface of the piston top in a rotating and sliding manner by virtue of a positioning nut (4012a) and a positioning step (5018a); the liquid of the check valve flows from bottom to top; the check valves (503, 504, 505) adopt circlip-type horizontal moving check valves; a safety device is arranged on the piston so as to eliminate the safety danger caused by the heat expansion of the hydraulic oil; the control valve element (501b) is provided with a decompression longitudinal hole (5017) for communicating the space of the installation hole (4011) and the exterior; and the longitudinal hole (5017) is not communicated with the central hole (5012), thereby reducing the pressure generated by the leakage of little hydraulic oil, and reducing the operating force of the control valve element.

9. The reciprocating piston engine according to claim 1, characterized in that a solution 1 of the safety device of the variable piston is that a safety valve (506) is installed on the valve sleeve, an inlet of the safety valve is communicated with the lower hydraulic cylinder, an outlet extends out of the piston, and opening pressure of the safety valve is higher than the working pressure of the lower hydraulic cylinder when the engine is at a highest rotation speed.

10. The reciprocating piston engine according to claim 1, characterized in that a solution 2 of the safety device of the variable piston is that: a sealing ring (4031) between an inner piston rod (4026) and a hydraulic cylinder cover plate (403) is changed to a split-ring type, and the safety of the hydraulic cylinder is guaranteed by virtue of the slow leakage of an opening.

11. The reciprocating piston engine according to claim 1, characterized in that the circlip-type horizontal moving check valves (503, 504, 505) respectively consist of valve seats (5031, 5041, 5054), valve elements (5032, 5042, 5057) and return springs (5033, 5043, 5056); in the process of opening and closing of the check valve, the moving direction of each valve element is perpendicular to that of an engine piston and return springs (5033, 5043, 5056) of the check valve are split-ring structures.

12. The reciprocating piston engine according to claim 1, characterized in that Embodiment 3 of a slide-valve-type directional control valve installed on a variable compression ratio piston is: a three-groove slide-sleeve three-position four-way external-liquid-type variable compression ratio piston control valve; a main valve structure is equivalent to a three-groove valve sleeve three-position four-way slide valve; a valve sleeve (502c) is provided with three annular grooves (5021, 5022, 5023); a middle annular groove is an upper cylinder annular groove (5022) communicated with the upper hydraulic cylinder, and a lower cylinder upper annular groove (5021) and a lower cylinder lower annular groove (5023) are communicated with the lower hydraulic cylinder; a valve element is of a hollow structure; an upper portion of the valve element is provided with a hydraulic oil inlet (5013) provided with a circlip-type horizontal check valve (503); liquid of the check valve flows outwards from the center of the valve element, and the check valve is communicated with a central hole (5012) of the valve element; a hydraulic oil outlet (5011) is provided in the middle portion, and the hydraulic oil outlet (5011) extends out of the piston; two sealing sections (5024, 5025) are arranged among the three annular grooves on the valve sleeve; the height of an upper sealing section (5024) is greater than or equal to the height of the annular groove (5015) at the hydraulic oil inlet on the valve element; the height of a lower sealing section (5025) is greater than or equal to the diameter of the hydraulic oil outlet (5011) in the middle portion of the valve element; the valve element (501c) is installed in the valve sleeve (502c) in a sliding manner, and the valve sleeve (502c) is fixed on the inner piston; the valve element (501c) is installed in a central installation hole (4011) on the inner surface of the piston top by virtue of a nut (4012) and a lead screw (5018); a control valve element (501c) is provided with a decompression longitudinal hole (5017a) for communicating the space of the installation hole (4011) and the central hole (5012) of the valve element, thereby reducing the pressure generated by the leakage of little hydraulic oil, and reducing the operating force of the control valve element.

13. The reciprocating piston engine according to claim 1, characterized in that Embodiment 4 of a slide-valve-type directional control valve installed on a variable compression ratio piston is: a two-groove slide-sleeve three-position four-way external-liquid-type variable compression ratio piston control valve; a main valve structure is equivalent to a two-groove valve sleeve three-position four-way slide valve; a valve sleeve (502d) is provided with two annular grooves (5022, 5023); an upper annular groove is an upper cylinder annular groove (5022) communicated with the upper hydraulic cylinder; a lower annular groove is a lower cylinder lower annular groove (5023) communicated with the lower hydraulic cylinder; a valve element (501d) is of a hollow structure; the valve element (501d) is provided with two groups of hydraulic oil inlets (5013, 5014) and a group of hydraulic oil outlets (5011); circlip-type annular grooves (5015, 5016) are provided on the outer circumference of the hydraulic oil inlets (5013, 5014) and provided with circlip-type horizontal moving check valves (503, 504); the flow direction of the check valve is from the center of the valve element to the outside, and the check valve is communicated with a central hole (5012) of the central rod; hydraulic oil outflow holes (5011) are provided in the middle; a sealing section (5025) is provided between the two annular grooves on the valve sleeve; valve element sealing sections (50112, 50113) are provided among three groups of flow passages of the valve element; the height of the valve sleeve sealing section (5025) is greater than or equal to the height of the hydraulic oil outflow hole (5011), and the heights of the valve element sealing sections (50112, 50113) are greater than or equal to the heights of the valve sleeve annular grooves (5022, 5023); the valve element (501d) is installed in the central installation hole (4011) on the inner surface of the piston top by virtue of a nut (4012) and a lead screw (4018); a control valve element (501d) is provided with a decompression longitudinal hole (5017a) for communicating the space of the installation hole (4011) and the central hole (5012) of the valve element, thereby reducing the pressure generated by the leakage of little hydraulic oil, and reducing the operating force of the control valve element.

14. The reciprocating piston engine according to claim 1, characterized in that Embodiment 5 of a slide-valve-type directional control valve installed on a variable compression ratio piston is: a three-position four-way spiral-groove longitudinally-distributed variable compression ratio piston control valve; a main control valve structure is equivalent to a three-groove valve sleeve three-position four-way slide valve; a valve sleeve (502e) is provided with three groups of longitudinal grooves (5021a, 5022a, 5023a); a middle longitudinal groove is an upper cylinder longitudinal groove (5022a) communicated with the upper hydraulic cylinder; a lower cylinder upper longitudinal groove (5021a) and a lower cylinder lower longitudinal groove (5023a) are communicated with the lower hydraulic cylinder; a valve element (501e) has a shape of a tube with a central hole; the top and the bottom of the outer cylindrical surface of the valve element are respectively provided with a group of spiral grooves (5013a, 5011ae); an upper spiral groove (5013a) is communicated with a hydraulic oil inlet (5013) and communicated with the central hole (5012) of the valve element; a lower spiral groove (5011ae) is communicated with a hydraulic oil outlet (5011e) and communicated with an external space through a longitudinal hole (50111); two sealing sections (5024, 5025) are provided between the upper longitudinal annular grooves of the valve sleeve; at an intersected surface of the valve sleeve (502e) longitudinal groove and the spiral groove (5013a, 5011ae), when the valve sleeve sealing sections are disposed in the middle of the spiral groove, the sealing sections can completely seal the spiral groove; the valve element (501e) is installed in the valve sleeve (502e) in a sliding manner, the valve sleeve (502e) is fixed on the inner piston; the valve element (501e) is installed in a central installation hole (4011) on the inner surface of the piston top by virtue of a positioning nut (4012a) and a positioning step (5018a); a check valve (505), i.e., the circlip-type horizontal check valve, is installed on the top of a drive rod, a control valve element (501e) is provided with a decompression longitudinal hole (5017) for communicating the space of the installation hole (4011) and the exterior, and the decompression longitudinal hole (5017) is not communicated with the central hole (5012), thereby reducing the pressure generated by the leakage of little hydraulic oil, and reducing the operating force of the control valve element.

15. The reciprocating piston engine according to claim 1, characterized in that Embodiment 6 of a slide-valve-type directional control valve installed on a variable compression ratio piston: a three-position four-way spiral-groove circumferentially-distributed variable compression ratio piston control valve; a valve sleeve (502f) is provided with four groups of longitudinal grooves, and the top and the bottom of the valve sleeve are respectively provided with two groups of longitudinal grooves; the upper longitudinal grooves are divided into an upper cylinder upper longitudinal groove (5022af) communicated with the upper hydraulic cylinder and a lower cylinder upper longitudinal groove (5021af) communicated with the lower hydraulic cylinder; the lower longitudinal grooves are divided into an upper cylinder lower longitudinal groove (5022af1) communicated with the upper hydraulic cylinder and a lower cylinder lower longitudinal groove (5023af1) communicated with the lower hydraulic cylinder; two groups of spiral grooves (5011af, 5013af) are arranged on the circumference of the outer cylindrical surface of the valve element (501f), one group of spiral grooves are hydraulic oil inlets (5013af) communicated with a central hole (5012) of the valve element, and the other group of spiral grooves are hydraulic oil outlets (5011af) communicated with the external space; two sealing sections (5024f, 5025f) are provided between the upper longitudinal annular grooves of the valve sleeve; at an intersected surface of the valve sleeve (502f) longitudinal groove and the spiral groove (5011af, 5013af), when the valve sleeve sealing sections are provided in the middle of the spiral grooves, the sealing sections can completely seal the spiral grooves; the valve element (501f) is installed in the valve sleeve (502f) in a sliding manner, the directions of the lower cylinder upper longitudinal groove (5021af) and the upper cylinder lower longitudinal groove (5022af1) correspond to the hydraulic oil inlets (5013f) of the valve element (501f), and the directions of the lower cylinder lower longitudinal groove (5023af1) and the upper cylinder upper longitudinal groove (5022af) correspond to the hydraulic oil inlets (5011f) of the valve element (501f); the valve sleeve (502f) is fixed on the inner piston, and the valve element (501e) is installed in the central installation hole (4011) on the inner surface of the piston top by virtue of a positioning nut (4012a) and a positioning step (5018a); a check valve (505) is installed on the top of a drive rod; a control valve element (501f) is provided with a longitudinal hole (5017) for communicating the space of the installation hole (4011) and the exterior, and the longitudinal hole (5017) is not communicated with the central hole (5012), thereby eliminating the pressure generated by the leakage of little hydraulic oil, and reducing the operating force of the control valve element.

Description

DESCRIPTION OF THE DRAWINGS

[0029] The present utility model is further described below in combination with drawings and embodiments:

[0030] FIG. 1 is a three-dimensional diagram showing a double-crankshaft variable compression ratio engine, a crankshaft connecting rod and a piston:

[0031] FIG. 2 is a horizontal section diagram showing a double-crankshaft variable compression ratio engine along a crankshaft main shaft;

[0032] FIG. 3 is a diagram showing a location relationship of a double-crankshaft variable compression ratio engine piston, a connecting rod, a crankshaft and a piston drive mechanism;

[0033] FIG. 4 is a diagram showing a coupling location relationship of an inner gear ring and an outer gear ring of double crankshafts;

[0034] FIG. 5 is a schematic diagram showing simplified coupling of gears of a double-crankshaft variable compression ratio engine;

[0035] FIG. 6 is a perspective diagram showing a three-shaft-type connector;

[0036] FIG. 7 is a perspective diagram showing a connecting rod;

[0037] FIG. 8 is a perspective diagram showing a piston pin;

[0038] FIG. 9 is a perspective diagram showing a flywheel-free crankshaft arm;

[0039] FIG. 10 is a perspective diagram showing a crankshaft arm with a flywheel;

[0040] FIG. 11 shows a drive rod on a variable compression ratio piston control valve;

[0041] FIG. 12 shows a drive slide sleeve on a variable compression ratio piston control valve;

[0042] FIG. 13 is a local diagram showing a drive and switch mechanism of a variable compression ratio piston control valve;

[0043] FIG. 14 is a sectional view showing a three-position three-way axial moving self-pumping variable compression ratio piston;

[0044] FIG. 15 is a sectional view showing a three-position three-way axial moving self-pumping variable compression ratio piston control valve;

[0045] FIG. 16 is a structural diagram showing a three-position three-way axial moving self-pumping variable compression ratio piston control valve element;

[0046] FIG. 17 is a structural diagram showing a three-position three-way axial moving self-pumping variable compression ratio piston control valve sleeve;

[0047] FIG. 18 shows a circlip-type external-liquid input check valve;

[0048] FIG. 19 is a structural diagram showing a three-position three-way spiral-groove self-pumping variable compression ratio piston;

[0049] FIG. 20 is a sectional view showing a three-position three-way spiral-groove self-pumping variable compression ratio piston control valve;

[0050] FIG. 21 is a sectional view showing a three-position three-way spiral-groove self-pumping variable compression ratio piston control valve sleeve;

[0051] FIG. 22 is a perspective view showing a three-position three-way spiral-groove self-pumping variable compression ratio piston control valve element;

[0052] FIG. 23 is a sectional view showing a three-position three-way spiral-groove self-pumping variable compression ratio piston control valve element;

[0053] FIG. 24 is a sectional view showing a three-groove slide-sleeve three-position four-way external-liquid-type variable compression ratio piston control valve;

[0054] FIG. 25 is a structural diagram showing a three-groove slide-sleeve three-position four-way external-liquid-type variable compression ratio piston control valve sleeve;

[0055] FIG. 26 is a sectional view showing a two-groove slide-sleeve three-position four-way external-liquid-type variable compression ratio piston control valve;

[0056] FIG. 27 is a structural diagram showing a two-groove slide-sleeve three-position four-way external-liquid-type variable compression ratio piston control valve sleeve;

[0057] FIG. 28 is a structural diagram showing a two-groove slide-sleeve three-position four-way external-liquid-type variable compression ratio piston control valve element;

[0058] FIG. 29 is a sectional view showing a three-position four-way spiral-groove longitudinally-distributed variable compression ratio piston control valve;

[0059] FIG. 30 is a sectional view showing a three-position four-way spiral-groove longitudinally-distributed variable compression ratio piston control valve sleeve (showing an upper hydraulic cylinder flow passage);

[0060] FIG. 31 is a sectional view showing a three-position four-way spiral-groove longitudinally-distributed variable compression ratio piston control valve sleeve (showing a lower hydraulic cylinder flow passage);

[0061] FIG. 32 is a perspective view showing a three-position four-way spiral-groove longitudinally-distributed variable compression ratio piston control valve element;

[0062] FIG. 33 is a sectional view showing a three-position four-way spiral-groove circumferentially-distributed variable compression ratio piston control valve (liquid flows in);

[0063] FIG. 34 is a sectional view showing a three-position four-way spiral-groove circumferentially-distributed variable compression ratio piston control valve (liquid flows out);

[0064] FIG. 35 is a perspective view showing a three-position four-way spiral-groove circumferentially-distributed variable compression ratio piston control valve element;

[0065] FIG. 36 is a structural diagram showing a three-position four-way spiral-groove circumferentially-distributed variable compression ratio piston control valve sleeve (showing an upper hydraulic cylinder flow passage); and

[0066] FIG. 37 is a structural diagram showing a three-position four-way spiral-groove circumferentially-distributed variable compression ratio piston control valve sleeve (showing a lower hydraulic cylinder flow passage).

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

[0067] FIG. 1-FIG. 3 show an overall structure of a crankshaft connecting rod and piston of a double-crankshaft variable compression ratio engine; in order to make the diagrams simple and clear, only one piston and connecting rod mechanism is drawn; the overall structure of the double-crankshaft variable compression ratio crankshaft connecting rod and piston is as follows: two sets of parallel flywheel crankshafts (200) are installed on a cylinder body (101); the two sets of parallel flywheel crankshafts are coupled together by virtue of gears (300); a three-shaft connector (600) is used for connecting the lower portion of a variable piston (400) and small ends of two connecting rods (700) by virtue of a rotating and sliding way of shafts and holes; big ends of the two connecting rods are installed on a crankshaft connecting rod shaft in a rotating and sliding manner, and a variable piston drive mechanism (800) is installed between the two connecting rods.

[0068] The cylinder body (101) is divided by three middle cylinder body separation plates (103) into four spaces; two rows of main shaft installation holes (104) are distributed on the middle cylinder body separation plates (103) and two end plates; a crankshaft arm end with a flywheel of the main shaft installation hole (104) is of a sleeve structure; a connecting rod main shaft installation hole (102) is arranged on a position of the cylinder body corresponding to a connecting rod main shaft and used for installing the connecting rod main shaft and an anti-thrust mechanism; the portion of the cylinder body at the main shaft may be manufactured by two portions and may also be manufactured as an integrated type according to the present embodiment.

[0069] A main shaft (201) with a taper angle on two ends is in interference fit with a central hole (2031) of a flywheel-free crankshaft arm (203) and with a central hole (2041) of a flywheel crankshaft arm (204) by virtue of main shaft tightening screws (205); a connecting rod shaft hole (2032) of the flywheel-free crankshaft arm (203) and a connecting rod shaft hole (2042) of the flywheel crankshaft arm (204) are connected together by virtue of a connecting rod main shaft (202), while the fitting way may be in interference fit, and may also be in sliding fit, and the sliding fit is selected in the present embodiment; the flywheel-free crankshaft arm (203) (FIG. 2) is of a blind-hole type, while a flywheel (2043) of the flywheel crankshaft arm (204) has thick edges and a thin middle portion; an annular gap (105) is reserved between the flywheel and each cylinder body separation plate (103); an anti-thrust screw (205) is installed on the flywheel crankshaft arm to form a complete crankshaft; and the crankshaft with the crankshaft arms installed oppositely is installed in the installation hole (104) of the cylinder body.

[0070] A gear (304) and a gear (306) are respectively fixed on the main shaft through tightening screws (305), (307), an outer gear ring (301) and an inner gear ring (302) are fixed together to form an inner and outer gear ring or are integrated, the outer gear ring (301) is engaged with the gear (306), the inner gear ring (302) is engaged with the gear (304), a tooth ratio of the outer gear ring (301) to the gear (306) is equal to a tooth ratio of the inner gear ring (302) to the gear (304), and the inner and outer gear rings are provided with a power output shaft (303).

[0071] FIG. 5 is a schematic diagram showing the simplified coupling of the gears of the double-crankshaft variable compression ratio engine; and the coupling of the inner gear ring and the outer gear ring is simplified to be the coupling of two identical gears.

[0072] FIG. 6 shows a structure of a three-hole connector (600); the three-hole connector is formed by integrating two angular plates (601) respectively with three shaft holes by virtue of a connecting plate (602); a through hole (603) for a valve element drive rod (808) is formed in the middle of the connecting plate (602); a larger shaft hole is a piston pin hole (604), two smaller shaft holes are connecting rod small-end shaft holes (605), and preferably, an opening portion in the middle of the three-hole connector is of a structure enlarged outwards.

[0073] FIG. 7 shows a structure of a connecting rod; the structure of the connecting rod is similar to that of an ordinary connecting rod; the connecting rod is formed by a connecting rod arm (701), a connecting rod small-end shaft hole (702) and a connecting rod big-end shaft hole (703); and the optimized connecting rod big end is of an integrated type, and the connecting rod small end is of a structure gradually thinned outwards.

[0074] FIG. 8 shows a structure of a piston pin; and the piston pin is divided into a piston pin main body (611), a weight-reducing hole (612) and a through hole (613) for the valve element drive rod (808).

[0075] FIG. 9 shows a structure of a flywheel-free crankshaft arm (203); the flywheel-free crankshaft arm is provided with a main shaft connecting hole (2031), a connecting rod main shaft hole (2032) and an eccentric weight (2033).

[0076] FIG. 10 shows a structure of a flywheel crankshaft arm (204); the flywheel crankshaft arm is provided with a main shaft connecting hole (2041), a connecting rod main shaft hole (2042) and an eccentric weight (2043), and a flywheel (2033) and the crankshaft arm are integrated.

[0077] FIG. 11-FIG. 13 show a structure of a variable compression ratio piston valve element steering drive mechanism, and the cooperation with relevant parts refers to FIG. 1 and FIG. 3; in the drawings, an upper drive rod (808) is of a tubular structure with a central through hole (8081), and circular-arc grooves (8082) are uniformly distributed from the middle-upper portion to the lower portion of the upper drive rod (808); a lower drive slide sleeve (807) is of a tubular structure with a drive rod positioning step (8071), a turbine positioning step (8072) and a turbine tightening screw thread (8073) and with a central through hole (8074); steel ball (or round-end rod) installation holes (8075) corresponding to the circular-arc grooves (8082) on the upper drive rod (808) are distributed on the top of the lower drive slide sleeve (807); the diameter of each circular-arc groove (8082) is identical to that of each installation hole (8075); steel balls or round-end rods in the installation holes (8075) are in sliding fit with the circular-arc grooves (8082); and the upper drive rod (808) can slide axially in the lower drive slide sleeve (807), and when the lower drive slide sleeve (807) is rotated, the upper drive rod (808) also rotates.

[0078] A hydraulic oil rail (801) is of a tubular structure with a central hole and is horizontally installed on the bottom of the cylinder body; a branch tube (8011) facing upwards is respectively arranged on a position corresponding to the center of each piston; the branch tube (8011) is also an installation sleeve of the lower drive slide sleeve (807); the lower drive slide sleeve (807) is installed in the branch tube (8011); the lower drive slide sleeve (807) is in rotating sliding fit with the branch tube (8011) and is positioned by virtue of the positioning step (8071) and the positioning screw (804); a turbine (805) is installed on the lower drive slide sleeve (807) and positioned by virtue of the positioning step (8071); the tightening screw (806) is installed on the turbine tightening screw thread (8073) and compresses and fixes the turbine (805); worms (803) with a quantity same with that of the pistons are distributed on a transverse drive rod (802) and are horizontally installed on the cylinder body; and the worms (803) are engaged with the turbine (805), and the control valve element can be driven to rotate by rotating the transverse drive rod (802).

[0079] The hydraulic oil rail (801) is communicated with lubricating oil of the engine, and the lubricating oil enters the valve element central hole (5012) through the hydraulic oil rail (801), the lower drive slide sleeve (807) and the upper drive rod (808).

[0080] The variable compression ratio piston valve element steering drive mechanism of the present embodiment adopts a turbine and worm transmission way; and according to a similar principle, the turbine and the worm are replaced by a gear and a worm, or replaced by a pair of bevel gears, the effect of the present embodiment can also be realized, thus is not repeated herein.

[0081] Embodiment 1 of a control valve: FIG. 14-FIG. 18 show a structure of a three-position three-way axial moving self-pumping variable compression ratio piston; the variable compression ratio piston is integrally of a double-acting hydraulic cylinder, the hydraulic cylinder comprises an outer piston (401) which is a cylinder body of the hydraulic cylinder; a hydraulic cylinder head (401) is fixed at an opening of the outer piston (401); the hydraulic cylinder is divided by an inner piston (402) into an upper hydraulic cylinder (4021) and a lower hydraulic cylinder (4022); the inner piston (402) is provided with a sealing ring (4024); the hydraulic cylinder head (401) is a cover plate with a central hole; an inner piston rod (4026) is installed to the hydraulic cylinder head in a sliding manner; a piston rod sealing ring (4031) is installed in an inner hole to realize the seal between the inner piston rod (4026) and the hydraulic cylinder head; the inner piston is provided with a lower hydraulic cylinder oil hole (4025) communicated with a lower cylinder oil passage of a control valve sleeve; the inner piston is provided with an installation hole (4023); the control valve sleeve (502a) is fixed in an installation hole (4023) arranged on the inner piston; a control valve element installation hole (4011) is arranged on the inner surface of the top of the outer piston; a lead screw nut (4012) of the axis-moving control valve element (501a) is fixed in the valve element installation hole (4011); a lead screw nut (4012) is installed on the control valve element lead screw (5018), and a sealing ring (4013) is arranged between the lead screw nut (4012) and the control valve element.

[0082] A control valve element (501b) of the three-position three-way axial moving self-pumping variable compression ratio piston is of a tubular structure with a central hole (5012); a group of valve element oil outlets (5011) is distributed in the middle of the control valve element in the radial direction; a group of valve element upper oil inlets (5013) is distributed at the upper end in the radial direction, and a group of valve element lower oil inlets (5014) is distributed at the lower end; a circlip-type spring groove (5015) is distributed at the outer circumference of the upper oil inlet (5013) of the control valve element, and a circlip-type spring groove (5016) is distributed at the outer circumference of the lower oil inlet (5013) of the control valve element; a slide-sleeve upper cylinder annular groove (5022a) and a valve sleeve lower cylinder lower annular groove (5023) are arranged in an inner hole of the control valve sleeve (502a); the valve sleeve upper cylinder annular groove (5022) is communicated with the upper hydraulic cylinder (4021) through a longitudinal groove (5022a), and the valve sleeve lower cylinder lower annular groove (5023) is communicated with the lower hydraulic cylinder through oil passages (5026, 5027, 5028, 4025); a safety valve (506) is installed in a safety valve installation hole (5029) on the valve sleeve, an inlet of the safety valve is communicated with the lower hydraulic cylinder, an outlet of the safety valve extends out of the piston, and the opening pressure of the safety valve (506) is higher than the working pressure of the lower hydraulic cylinder when the engine is at a highest rotation speed; a valve sleeve lower sealing section (5025) is provided between the upper cylinder annular groove (5022) and the lower cylinder lower annular groove (5023), and the height of the valve sleeve lower sealing section (5025) is greater than or equal to the height of the valve element oil outlet (5011); and the upper oil inlet (5013) of the control valve element and the lower oil inlet (5014) of the control valve element are always communicated with the valve sleeve upper cylinder annular groove (5022) and the valve sleeve lower cylinder lower annular groove (5023) during the working process.

[0083] The circlip-type horizontal moving check valves (503, 504) are installed in the upper and lower oil inlets (5013, 5014) of the control valve element, and the circlip-type horizontal moving check valves (503, 504) respectively consist of a valve seat (5031, 5041), a valve element (5032, 5042) and a circlip-type spring (5033, 5034).

[0084] A working hydraulic oil one-way inflow valve (505) is installed on the bottom of the control valve element; a circlip-type horizontal moving check valve is installed on a valve element (5051) of the working hydraulic oil one-way inflow valve (505); the horizontal moving check valve comprises a valve hole (5055), a valve seat (5054), a valve element (5057) and a circlip-type spring (5056); a flow direction of the horizontal moving check valve is from inside to outside; the upper portion of the valve element (5051) is provided with a radial hole (5059), a lower central hole (50511) and an upper central hole (50510) are arranged in the middle of the valve element (5051), and the lower central hole (50511) and the upper central hole (50510) are not communicated with each other; the valve element (5051) is sleeved with a valve sleeve (5052); the valve element (5051) and the valve sleeve (5052) can be in interference fit with each other to realize the seal; and as shown in FIG. 18, a sealing ring (5058) may also be installed, a gap (5059) is reserved between the valve element (5051) and the valve sleeve (5052), thereby realizing a purpose of working hydraulic oil flowing into the upper central hole from the lower central hole (50510) via the check valve.

[0085] The control valve element (501a) is provided with a longitudinal hole (5017) for communicating the space of the installation hole (4011) and the exterior; and the longitudinal hole (5017) is not communicated with the central hole (5012), thereby eliminating the pressure generated by the leakage of little hydraulic oil, and reducing the operating force of the control valve element.

[0086] Embodiment 2 of the control valve: FIG. 19-FIG. 23 show a structure of a three-position three-way spiral-groove self-pumping variable compression ratio piston; an overall structure of the variable compression ratio piston is integrally of a double-acting hydraulic cylinder; a control valve sleeve (502b) is fixed in an installation hole (4023) arranged on the inner piston; a control valve element installation hole (4011) is arranged on the inner surface of the top of the outer piston; a positioning step (5018a) of the control valve element (501b) is fixed in the valve element installation hole (4011) by virtue of a positioning nut (4012a); an anti-thrust mat (4014) is installed on the top of the control valve element, and the control valve element (501b) can rotate in the installation hole (4011).

[0087] The control valve element (501b) of the three-position three-way spiral-groove self-pumping variable compression ratio piston is of a tubular structure with a central hole (5012); a group of valve element oil outlets (5011) is distributed in the middle of the control valve element in the radial direction, a group of upper oil inlets (5013) is distributed at the upper end in the radial direction, and a group of lower oil inlets (5014) is distributed at the lower end; a circlip-type spring groove (5015) is distributed at the outer circumference of the upper oil inlet (5013) of the control valve element, and a circlip-type spring groove (5016) is distributed at the outer circumference of the lower oil inlet (5013) of the control valve element; the outer circumference of the control valve element (601b) is provided with a group of spiral grooves (5011a); the valve element oil outlet (5011) is disposed in the middle of the spiral groove (5011a); an inner hole of the control valve sleeve (502b) is provided with a slide-sleeve upper cylinder longitudinal groove (5022a) and a valve sleeve lower cylinder lower longitudinal groove (5023a), and the slide-sleeve upper cylinder annular groove (5022a) is communicated with the upper hydraulic cylinder (4021); the slide-sleeve lower cylinder lower annular groove (5023a) is communicated with the lower hydraulic cylinder through oil passages (5026, 5027, 5028); a safety valve (506) is installed in a safety valve installation hole (5029) on the valve sleeve, an inlet of the safety valve is communicated with the lower hydraulic cylinder, an outlet extends out of the piston, and the opening pressure of the safety valve (506) is higher than the working pressure of the lower hydraulic cylinder when the engine is at the highest rotation speed; a valve sleeve lower sealing section (5025) is provided between the upper cylinder longitudinal groove (5022a) and the lower cylinder lower longitudinal groove (5023a), and when the valve sleeve lower sealing section (5025) is disposed in the middle of the spiral groove (5011a), the valve sleeve lower sealing section (5025) can completely seal the spiral groove (5011a); and the upper oil inlets (5013) of the control valve element and the lower oil inlets (5014) of the control valve element are always communicated with the slide-sleeve upper cylinder annular groove (5022a) and the slide-sleeve lower cylinder lower annular groove (5023a) during the working process.

[0088] The circlip-type horizontal moving check valves (503, 504) are installed in the upper and lower oil inlets (5013, 5014) of the control valve element, and the circlip-type horizontal moving check valves (503, 504) respectively consist of a valve seat (5031, 5041), a valve element (5032, 5042) and a circlip-type spring (5033, 5034).

[0089] A working hydraulic oil one-way inflow valve (505) is installed on the bottom of the control valve element, and the structure of the working hydraulic oil one-way inflow valve is the same with the structure of the three-position three-way axial moving self-pumping variable compression ratio working hydraulic oil one-way inflow valve (505).

[0090] The control valve element (501b) is provided with a longitudinal hole (5017) for communicating the space of the installation hole (4011) and the exterior; and the longitudinal hole (5017) is not communicated with the central hole (5012), thereby eliminating the pressure generated by the leakage of little hydraulic oil, and reducing the operating force of the control valve element.

[0091] It can be seen from the above description that compared with the control valve element (501a), the control valve element (501b) is additionally provided with the spiral grooves (5011a), the installation way is changed from the installation by the nut and the lead screw to the rotating and sliding installation; and comparing the control valve sleeve (502b) and the control valve sleeve (502a), the upper cylinder annular groove (5022) and the lower cylinder lower annular groove (5023) are changed to the upper cylinder longitudinal groove (5022a) and the lower cylinder lower longitudinal groove (5023a), and other structures are identical.

[0092] Embodiment 3 of a control valve: FIG. 24-FIG. 25 show a structure of a three-groove slide-sleeve three-position four-way external-liquid-type variable compression ratio piston control valve, and a control valve element (501c) is installed in an installation hole (4011) by adopting a nut (4012) and a lead screw (5018); the control valve element (501c) is provided with a group of radial valve element oil outlets (5011) and a group of valve element upper oil inlets (5013); the radial valve element oil outlet (5011) is not communicated with the central hole (5012), the valve element oil outlet (5011) is communicated with a longitudinal oil discharging port (50111), and the longitudinal oil discharging port (50111) discharges the hydraulic oil out of the piston; the valve element upper oil inlet (5013) is identical to that in embodiment 1 and embodiment 2; a circlip-type horizontal moving check valve (503) is installed in the valve element upper oil inlet (5013), and the circlip-type horizontal moving check valve (503) is identical to the circlip-type check valve of the embodiment 1 and embodiment 2 and consists of a valve seat (5031), a valve element (5032) and a circlip-type spring (5033); a sealing section (50112) is provided between the valve element upper oil inlet (5013) and the valve element oil outlet (5011) of the control valve element (501c); the inner hole of the control valve sleeve (502c) is provided with three annular grooves, i.e. a valve sleeve lower cylinder upper annular groove (5021), a valve sleeve upper cylinder annular groove (5022) and a valve sleeve lower cylinder lower annular groove (5023), and two sealing sections, i.e. an upper valve sleeve sealing section (5024) and a lower valve sleeve sealing section (5025) are arranged among the annular grooves; the valve sleeve upper cylinder annular groove (5022) is communicated with the upper hydraulic cylinder through a longitudinal hole (50221) and a radial hole (50222); the valve sleeve lower cylinder upper annular groove (5021) and the valve sleeve lower cylinder lower annular groove (5023) are communicated with the lower hydraulic cylinder through oil passages (5026, 5027, 5028); the height of the valve sleeve upper sealing section (5024) is greater than or equal to the height of a circlip-type spring groove (5015) on the outer circumference of the valve element upper oil inlet (5013), the height of the valve sleeve lower sealing section (5025) is greater than or equal to the height of the valve element oil outlet (5011), and the height of the valve element upper sealing section (50112) is greater than or equal to the height of the valve sleeve upper cylinder annular groove (5022); when the control valve element (501c) moves upwards, the valve sleeve lower cylinder upper annular groove (5021) is communicated with the valve element upper oil inlet (5013), the valve sleeve upper cylinder annular groove (5022) is communicated with the valve element oil outlet (5011), the hydraulic oil is discharged from the upper hydraulic cylinder and enters the lower hydraulic cylinder, the inner piston moves up, the valve sleeve (502c) is driven to move upwards, and finally the control valve is closed; and when the control valve element (501c) moves downwards, the valve sleeve lower cylinder lower annular groove (5023) is communicated with the valve element oil outlet (5011), the valve sleeve upper cylinder annular groove (5022) is communicated with the valve element oil inlet (5013), the oil enters the upper hydraulic cylinder and is discharged from the lower hydraulic cylinder, the inner piston moves down, the valve sleeve (502c) is driven to move upwards, and the control valve is finally closed, thereby realizing the movement of the inner piston along with the valve element.

[0093] The control valve element (501c) is provided with a longitudinal hole (5017a) for communicating the space of the installation hole (4011) and the central hole (5012), thereby eliminating the pressure generated by the leakage of little hydraulic oil, and reducing the operating force of the control valve element.

[0094] Embodiment 4 of a control valve: FIG. 26-FIG. 28 show a structure of a two-groove slide-sleeve three-position four-way external-liquid-type variable compression ratio piston control valve, and the control valve element (501d) is installed in an installation hole (4011) by adopting a nut (4012) and a lead screw (5018); the control valve element (501d) is provided with a group of radial valve element oil outlets (5011), a group of valve element upper oil inlets (5013) and a group of valve element lower oil inlets (5014); the upper oil inlet (5013) of the control valve element (501d) and the valve element lower oil inlet (5014) are provided with a circlip-type horizontal moving check valve (503, 504); the radial valve element oil outlet (5011) is not communicated with the central hole (5012), the valve element oil outlet (5011) is communicated with a longitudinal oil discharging port (50111), and the longitudinal oil discharging port (50111) discharges the hydraulic oil out of the piston; two sealing sections (50112, 50113) are provided between the valve element upper oil inlet (5013) and the valve element lower oil inlet (5014) of the control valve element (501d); the inner hole of a control valve sleeve (502d) is provided with two annular grooves, i.e. a valve sleeve lower cylinder lower annular groove (5023) and a valve sleeve upper cylinder annular groove (5022), and an upper valve sleeve sealing section (5024) is provided between the annular grooves; the valve sleeve upper cylinder annular groove (5022) is communicated with the upper hydraulic cylinder through the longitudinal groove (5022a), and the valve sleeve lower cylinder lower annular groove (5023) is communicated with the lower hydraulic cylinder through an oil passage (5028); the height of the valve sleeve lower sealing section (5024) is greater than or equal to the height of a circlip-type spring groove (5015) on the outer circumference of the valve element upper oil inlet (5013), the height of the valve sleeve lower sealing section (5025) is greater than or equal to the height of the valve element oil outlet (5011), and the height of the valve element upper sealing section (50112) is greater than or equal to the height of the valve sleeve upper cylinder annular groove (5022); the height of the valve element lower sealing section (50113) is greater than or equal to the height of the valve sleeve lower cylinder lower annular groove (5023); when the control valve element (501d) moves upwards, the valve sleeve upper annular groove (5022) is communicated with the valve element oil outlet (5013), the valve sleeve lower cylinder lower annular groove (5023) is communicated with the valve element lower oil inlet (5014), oil is discharged from the upper hydraulic cylinder and enters the lower hydraulic cylinder, the inner piston moves up, the valve sleeve (502d) is driven to move upwards, and finally the control valve is closed; when the control valve element (501d) moves downwards, the valve sleeve upper cylinder annular groove (5022) is communicated with the valve element upper oil inlet (5013), the valve sleeve lower cylinder lower annular groove (5023) is communicated with the valve element oil outlet (5011), the oil enters the upper hydraulic cylinder and is discharged from the lower hydraulic cylinder, the inner piston moves down, the valve sleeve (502d) is driven to move upwards, and finally the control valve is closed, thereby realizing the movement of the inner piston along with the valve element.

[0095] The control valve element (501d) is provided with a longitudinal hole (5017a) for communicating the space of the installation hole (4011) and the central hole (5012), thereby eliminating the pressure generated by the leakage of little hydraulic oil, and reducing the operating force of the control valve element.

[0096] Embodiment 5 of a control valve: FIG. 29-FIG. 32 show a structure of a three-position four-way spiral-groove longitudinally-distributed variable compression ratio piston control valve, and a control valve element (501e) is installed in an installation hole (4011) by adopting a positioning nut (4012a) and a positioning step (5018a); the control valve element (501e) is provided with a group of radial valve element oil outlets (5011e) and a group of valve element upper oil inlets (5013), and the valve element oil outlets (5011e) and the valve element upper oil inlets (5013) are distributed longitudinally; the outer circumference of the valve element is provided with two groups of spiral grooves (5011ae, 5013a); the radial valve element oil outlet (5011e) and the valve element upper oil inlet (5013) are disposed in the spiral grooves (5011ae, 5013a); the radial valve element oil outlet (5011e) is not communicated with the central hole (5012); the valve element oil outlet (5011e) is communicated with the longitudinal oil discharging port (50111), and the longitudinal oil discharging port (50111) discharges the hydraulic oil out of the piston; the bottom of the valve element is provided with the working liquid one-way inflow valve (505); an inner hole of the control valve sleeve (502e) is provided with three groups of longitudinal grooves, i.e. a valve sleeve lower cylinder upper annular groove (5021a), a valve sleeve upper longitudinal groove (5022a) and a valve sleeve lower cylinder lower longitudinal groove (5023a); two sealing sections, i.e. an upper valve sleeve sealing section (5024) and a lower valve sleeve sealing section (5025) are provided among the longitudinal grooves; the valve sleeve upper cylinder longitudinal groove (5022a) is communicated with the upper hydraulic cylinder through the longitudinal hole (50221), the radial hole (50222), the outer annular groove (50223) and the radial hole (50224), and the valve sleeve lower cylinder upper annular groove (5021a) and the valve sleeve lower cylinder lower annular groove (5023a) are communicated with the lower hydraulic cylinder through oil passages (50231, 50232, 50233, 50234, 50235, 50236, 50215); the height of the valve sleeve upper sealing section (5024) is greater than or equal to the height of the valve element upper oil inlet (5013), the height of the valve sleeve lower sealing section (5025) is greater than or equal to the height of the valve element oil outlet (5011), and the height of the valve element upper sealing section (50112) is greater than or equal to the height of the valve sleeve upper cylinder annular groove (5022a); when the control valve element (501e) rotates, a junction of the control valve element spiral groove and the valve sleeve longitudinal groove moves up relatively, the valve sleeve lower cylinder upper longitudinal groove (5021a) is communicated with the valve element upper oil inlet (5013), the valve sleeve upper cylinder longitudinal groove (5022a) is communicated with the valve element oil outlet (5011e), the oil is discharged from the upper hydraulic cylinder and enters the lower hydraulic cylinder, the inner piston moves up, the valve sleeve (502e) is driven to move upwards, and finally the control valve is closed; when the control valve element (501e) rotates, the junction of the control valve element spiral groove and the valve sleeve longitudinal groove moves down relatively, the valve sleeve lower cylinder lower longitudinal groove (5023a) is communicated with the valve element oil outlet (5011a), the valve sleeve upper cylinder longitudinal groove (5022a) is communicated with the valve element oil inlet (5013), the oil enters the upper hydraulic cylinder and is discharged from the lower hydraulic cylinder, the inner piston moves down, the valve sleeve (502e) is driven to move upwards, and finally the control valve is closed, thereby realizing the movement of the inner piston along with the valve element.

[0097] The control valve element (501e) is provided with a longitudinal hole (5017) for communicating the space of the installation hole (4011) and the exterior; and the longitudinal hole (5017) is not communicated with the central hole (5012), thereby eliminating the pressure generated by the leakage of little hydraulic oil, and reducing the operating force of the control valve element.

[0098] Embodiment 6 of a control valve: FIG. 33-FIG. 37 show a structure of a three-position four-way spiral-groove circumferentially-distributed variable compression ratio piston control valve, and a control valve element (501f) is installed in an installation hole (4011) by adopting a positioning nut (4012a) and a positioning step (5018a); the control valve element (501f) is provided with a group of valve element oil outlets (5011f) and a group of valve element oil inlets (5013f), and the valve element oil outlets (5011f) and the valve element upper oil inlets (5013f) are alternately distributed along the circumference; the outer circumference of the valve element is provided with two groups of spiral grooves (5011af, 5013af); the radial valve element oil outlet (5011f) and the valve element oil inlet (5013f) are disposed in the spiral grooves (5011af, 5013af); the radial valve element oil outlet (5011f) is not communicated with the central hole (5012); the valve element oil outlet (5011f) is communicated with a longitudinal oil discharging port (50111f), and the longitudinal oil discharging port (50111f) discharges the hydraulic oil out of the piston; the longitudinal oil discharging hole is also longitudinally communicated with the top of the valve element, thereby realizing an effect of eliminating the pressure in the installation hole (4011); the bottom of the valve element is provided with a working liquid one-way inflow valve (505); a control valve sleeve (502f) is provided with four groups of longitudinal grooves, the top and the bottom are respectively provided with two groups of longitudinal grooves, the two groups of circumferentially-distributed longitudinal grooves are respectively communicated with the upper hydraulic cylinder and the lower hydraulic cylinder, the upper group and the lower group of longitudinal grooves in the longitudinal direction are communicated with different hydraulic cylinders, two groups of longitudinal grooves control the inflow, and two groups of longitudinal grooves control the outflow; FIG. 33 shows a section of an inflow control direction, the upper longitudinal groove (5021af) is communicated with the lower hydraulic cylinder, the lower longitudinal groove (5022af) is communicated with the upper hydraulic cylinder, and the direction is opposite to the upper oil inlet (5013f) of the control valve element; FIG. 34 shows a section of an outflow control direction, the upper longitudinal groove (5022af1) is communicated with the upper hydraulic cylinder, the lower longitudinal groove (5021af1) is communicated with the lower hydraulic cylinder, and the direction is opposite to the control valve element oil outlet (5011f); the upper hydraulic cylinder is communicated with the upper longitudinal groove (5022af) and the lower longitudinal groove (5022f) by virtue of oil passages (50221, 50222f, 50223f), the lower hydraulic cylinder is communicated with the upper longitudinal groove (5021af) and the lower longitudinal groove (5021af1) by virtue of oil passages (50231f, 50232f, 50233f, 50234f, 50235f); when the control valve element (501f) rotates, a junction of the control valve element spiral groove and the valve sleeve longitudinal groove moves up relatively, the valve sleeve lower cylinder upper longitudinal groove (5021af) is communicated with the valve element upper oil inlet (5013f), the valve sleeve upper cylinder upper longitudinal groove (5022af1) is communicated with the valve element oil outlet (5011f), oil is discharged from the upper hydraulic cylinder and enters the lower hydraulic cylinder, the inner piston moves up, the valve sleeve (502f) is driven to move upwards, and finally the control valve is closed; when the control valve element (501f) rotates, the junction of the control valve element spiral groove and the valve sleeve longitudinal groove moves down relatively, the valve sleeve lower cylinder lower longitudinal groove (5023af1) is communicated with the valve element oil outlet (5011f), the valve sleeve upper cylinder longitudinal groove (5022af) is communicated with the valve element oil inlet (5013f), oil enters the upper hydraulic cylinder and is discharged from the lower hydraulic cylinder, the inner piston moves down, the valve sleeve (502f) is driven to move upwards, and finally the control valve is closed, thereby realizing the movement of the inner piston along with the valve element.