THROTTLE

Abstract

A throttle (1) comprising a housing (10, 4) and a throttle body (2), wherein a flow channel (11) is provided in the housing (10, 4), which extends along a longitudinal axis, wherein the throttle body (2) is arranged in the flow channel (11) so as to be rotatable about a transverse axis (A), wherein the transverse axis (A) intersects the longitudinal axis at an angle of 90 degrees, wherein the size of at least one through-opening formed between the housing (10,4) and the throttle body (2) is variable, wherein the throttle body (2) is arranged in a transverse channel (12) which extends along the transverse axis (A), which projects at least partially beyond the circumference of the flow channel (11) and which is closed at its two ends, and wherein the throttle body (2) extends along the transverse axis (A) as far as the two ends of the transverse channel (12) and extends at least partially as far as the circumference of the transverse channel (12).

Claims

1. A throttle (1) comprising a housing (10, 4) and a throttle body (2), wherein a flow channel (11) is provided in the housing (10, 4) extending along a longitudinal axis (L), wherein the throttle body (2) is arranged in the flow channel (11) so as to be rotatable about a transverse axis (A), wherein the transverse axis (A) intersects the longitudinal axis (L) at an angle of 90 degrees, wherein the size of at least one through-opening formed between the housing (10, 4) and the throttle body (2) can be varied by rotation of the throttle body (2), characterized in that the throttle body (2) is arranged in a transverse channel (12) which extends along the transverse axis (A), which projects at least partially beyond the circumference of the flow channel (11) and which is closed at its two ends, and in that the throttle body (2) extends along the transverse axis (A) as far as the two ends of the transverse channel (12) and extends at least partially as far as the circumference of the transverse channel (12).

2. The throttle (1) according to claim 1, wherein the diameter of the transverse channel (12) is equal to the diameter of the flow channel (11).

3. The throttle (1) according to claim 1, wherein the throttle body (2) comprises a centric recess (20) with which it is arranged on a shaft (3).

4. The throttle (1) according to claim 3, wherein the centric recess (20) is a bore.

5. The throttle (1) according to claim 3, comprising a fixation (30) with which a relative movement between the throttle body (2) and the shaft (3) can be prevented.

6. The throttle (1) according to claim 3, comprising two bearings (31) with which the shaft (3) is mounted on both sides in the housing (10, 4).

7. The throttle (1) according to claim 3, wherein the throttle body (2) comprises a stop (32) which projects along the transverse axis (A) beyond an end face of the throttle body (2).

8. The throttle (1) according to claim 7, wherein the stop (32) extends along the transverse axis in a region located in the projection of the fixation (30) in the mounting direction which is opposite the shaft (3).

9. The throttle (1) according to claim 3, wherein the throttle body (2) extends at least to two mutually opposite generatrixes (21) of a cylindrical body whose axis of rotation is congruent with the transverse axis (A).

10. The throttle (1) according to claim 3, wherein the throttle body (2) comprises a cylindrical body, in the circumferential surface of which at least one groove-shaped recess (22) is provided, which extends at least partially along the circumference, from at least one of the generatrixes (21), wherein the center plane of the recess (22) is parallel to the end faces of the throttle body (2).

11. The throttle (1) according to claim 10, wherein the at least one recess (22) of the throttle body (2) comprises a substantially triangular cross-section, whereby the at least one recess (22) comprises two adjacent flanks (220).

12. The throttle (1) according to claim 11, wherein a transition region (221) between two adjacent flanks (220) of the at least one recess (22) of the throttle body (2) is of rounded design and forms a groove base.

13. The throttle (1) according to claim 10, wherein the at least one recess (22) comprises two sections, wherein a first section adjoins one of the generatrixes (21) and therein the radial distance (R) from the transverse axis (A) to the recess continuously decreases from the generatrix (21), and wherein a second section adjoins the first section, wherein the recess (22) in the second section extends in a direction which is parallel to a straight line (G) which intersects the transverse axis (A) and the generatrixes (21) perpendicularly.

14. The throttle (1) according to claim 1, comprising a drive (5) which is operatively connected to the throttle body (2) and can rotate it about the transverse axis (A).

15. The throttle (1) according to claim 1, comprising a return element (6) which counteracts a rotation of the throttle body (2) at least in one direction.

16. The throttle (1) according to claim 1, comprising at least one adapter with a channel extending along the longitudinal axis (L), which at its one end has the same dimensions as the flow channel (11) formed in the housing (10, 4) and is connected with this end to the housing (10, 4) at least at one inlet-side end of the flow channel (11), and which on its opposite side has smaller dimensions.

17. A system comprising an engine (90) having a crankcase (91), an oil separator (92), a throttle (1) according to one of the preceding claims, and a turbocharger (94), wherein the crankcase (91), the oil separator (92), the throttle (1), and the turbocharger (94) are interconnected by conduits in a closed circuit.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Exemplary embodiments of the present invention are explained in further detail below with reference to figures. These are for explanatory purposes only and are not to be construed restrictively. The figures show as follows:

[0026] FIG. 1 shows a perspective view of a throttle according to the invention;

[0027] FIG. 2 shows a sectional view through the longitudinal and transverse axes of FIG. 1;

[0028] FIG. 3 shows a section of a cross-sectional view through the transverse axis of FIG. 1 perpendicular to the sectional view of FIG. 2;

[0029] FIG. 4 shows a perspective view of a first embodiment of a throttle body according to the invention;

[0030] FIG. 5 shows a perspective view of a second embodiment of a throttle body according to the invention;

[0031] FIG. 6 shows a sectional view of FIG. 5 in a center plane perpendicular to the transverse axis; and

[0032] FIG. 7 shows a system having a throttle according to the invention.

DETAILED DESCRIPTION OF THE INVENTION

[0033] FIG. 1 shows a perspective view of a throttle 1 according to the invention, FIG. 2 shows a sectional view through the longitudinal and transverse axes of FIG. 1 and FIG. 3 shows a section of a sectional view through the transverse axis of FIG. 1 perpendicular to the sectional view of FIG. 2. The throttle 1 comprises a housing 10 with a cover 4 and a throttle body 2, wherein a flow channel 11 is provided in the housing 10 and extends along a longitudinal axis L. The throttle body 2 is arranged rotatably about a transverse axis A in the flow channel 11. The transverse axis A intersects the longitudinal axis L at an angle of 90 degrees. The throttle body 2 is arranged in a transverse channel 12 which extends along the transverse axis A, which projects at least partially beyond the circumference of the flow channel 13 and which is closed at its two ends. The throttle body 2 extends along the transverse axis A to the two ends of the transverse channel 12 and extends at least partially to the circumference of the transverse channel 12. On the engine side, the transverse channel 12 is closed by the cover 4. The cover 4 is screwed to the housing 10. The diameter of the transverse channel 12 is the same as that of the flow channel 11. The throttle body 2 is arranged on a shaft 3, which is rotatably mounted on both sides in the housing 10 or in the cover 4 by means of plain bearings 31. A screw 32 is screwed into the throttle body from one end face of the throttle body 2 along the transverse axis A. The screw head projects along the transverse axis A beyond the end face and serves as a stop. The screwed-in end of the screw 32 projects behind the screwed-in set screw 30 into the threaded hole into which the set screw 30 was screwed, thus preventing it from falling out of the throttle body if it should have come loose. The shaft 3 is operatively connected to a drive 5. The drive 5 is screwed to the cover 4.

[0034] The drive 5 is surrounded by a closed, cylindrical cooling jacket 7 with cooling fins, which is screwed to the housing 10 by a cooling jacket cover 80. An electrical connection 50 for the drive 5 is provided on the cooling jacket cover 80. The drive 5 is designed as an electric motor. For example, as a stepper motor with an electronics unit, wherein the electronics unit can comprise a control system, a closed-loop control system and a bus communication system. A return element 6 is arranged on the side of the shaft 3 opposite the motor 5 in a recess in the housing 10 and is operatively connected to the shaft. The return element 6 shown is a spiral spring which is connected in its inner region to the shaft 3 and in its outer region to the housing 10. The recess in which the spiral spring 6 is located is accessible from the outside, closed by a cover 8 and sealed by a closed circumferential seal 81. Further seals 81, between the shaft 3 and the cover 4, between the cover 4 and the housing 10 and between the housing 10 and the cooling jacket 7, prevent gas from being drawn in from the surroundings in the event of a negative pressure in the throttle 1, or prevent gas from being discharged into the surroundings in the event of an excess pressure in the throttle 1.

[0035] FIG. 4 shows a perspective view of a first embodiment of a throttle body 2 according to the invention. The throttle body comprises a centric recess 20, with which it can be arranged on a shaft 3, with a cross-section complementary thereto. The recess 20 shown is a through-hole which extends from one end face to an opposite end face thereto. The throttle body 2 extends to two mutually opposite generatrixes 21 of a cylindrical body, the axis of rotation of which is congruent with the transverse axis A. The thickness of the throttle body increases from the generatrixes 21 to the central recess 20. The threaded hole 23 for screwing in the threaded pin 30 extends from the center of one of the two generatrixes 21 in a direction perpendicular to the transverse axis A to the centric recess 20. On the opposite side of the threaded hole 23, another hole 24 is provided for symmetry reasons, which is identical to the threadless part of the threaded hole 23. A further threaded hole 25 is arranged in one of the end faces and extends into the threadless part of the threaded hole 23. The further threaded hole 25 is arranged on a straight line G which intersects the transverse axis A and the generatrix 21 perpendicularly.

[0036] FIG. 5 shows a perspective view of a second embodiment of a throttle body 2 according to the invention, and FIG. 6 shows a sectional view of FIG. 5 in a center plane M perpendicular to the transverse axis A. As in the preceding embodiment, the throttle body 2 shown here comprises a central recess 20, a threaded bore 23 for screwing in the threaded pin, a corresponding symmetry bore 24 and a threaded bore 25 for screwing in the stop screw. In addition, the throttle body 2 shown comprises a cylindrical body, in the circumferential surface of which two groove-shaped recesses rotated by 180 degrees with respect to the transverse axis A are provided, each extending from a generatrix 21, along part of the circumference of the circumferential surface. The center plane M of the recesses is congruent with the center plane M of the two end faces of the throttle body 2. Each of the two recesses has a substantially triangular cross-section with two flanks 220 adjacent to each other. The transition region 221 between the two mutually adjacent flanks 220 is provided with a radius and forms a rounded groove base. Each of the two recesses 22 comprises two sections, wherein a first section adjoins the respective generatrix 21. In this first section, the radial distance R from the transverse axis A to the groove base of the recess 22 decreases continuously from the generatrix 21. This causes the width and depth of the groove to increase. A second section continuously adjoins the first section on the side opposite the generatrix 21. In the second section, the recess 22 extends in a direction which is parallel to a straight line G which intersects the transverse axis A and the generatrixes 21 perpendicularly. Thus, in the fully open state of the throttle body 2, the second section of the recess 22 is parallel to the longitudinal axis L of the flow channel 11.

[0037] FIG. 7 shows a system with a throttle 1 according to the invention. The system comprises an internal combustion engine 90 having a crankcase 91, an oil separator 92, a throttle 1 according to the invention and a turbocharger 94, which are connected to each other by conduits in a closed circuit. During operation of the internal combustion engine 90, blow-by gas 901 flows from the interior of the piston into the crank chamber located in the crankcase 91. An oil sump 900 is located in a lower portion of the crankcase 91 for lubricating the moving parts. During operation, oil vapor is generated. To prevent overpressure in the crankcase 91, air is exhausted from the crank chamber with the turbocharger 94 via the oil separator 92 and the throttle 1, creating a negative pressure in the crankcase 91. The blow-by gas 901 is forced into the crank chamber intermittently, creating pressure surges in the closed circuit, resulting in varying flow rates in the circuit. Since the oil separator 92 functions most effectively when the flow rate is as constant as possible, it is regulated by the throttle 1. The system further includes an air filter 93 through which fresh air is drawn in and a cooler 95 with which the fresh air compressed in the turbocharger 94 is cooled. The supercharged and cooled air is then fed to the combustion chambers of the internal combustion engine 90.

TABLE-US-00001 LIST OF REFERENCE SIGNS 1 Throttle 10 Housing 11 Flow channel 12 Transverse channel 2 Throttle body 20 Through-hole 21 Generatrix 22 Recess 220 Flank 221 Base 23 Fixing hole 24 Bore 25 Stop bore 3 Shaft 30 Fixation 31 Bearing 32 Stop 4 Flange 5 Drive 50 Connection 6 Return element 7 Cooling jacket 8 Cover 80 Cover 81 Seal 9 System 90 Motor 91 Housing 92 Oil separator 93 Air filter 94 Turbocharger 95 Cooler 900 Oil sump 901 Blow-by gas A Transverse axis G Straight line L Longitudinal axis M Center plane R Radius