High-pressure fuel pump actuator used in engine

Abstract

A high-pressure fuel pump actuator used in an engine, which is used in a fuel injection system of an engine, is mounted on between a driving cam and a fuel pump plunger. The pump actuator includes a guide sleeve, a U-shaped holder, and a pin shaft roller set. The U-shaped holder is formed by stamping the steel plate integrally. The guide sleeve uses a special windowing manner. Both ends of the pin shaft do not need riveting. The structure of the present invention has less number of parts and integrated functions, which can notably reduce the entire weight, the inertial force, the friction, and the abrasion. The operation is steady. The efficiency of the engine is improved.

Claims

1. A high-pressure fuel pump actuator used in an engine, which is used in a fuel injection system of an engine, is mounted on between a driving cam and a fuel pump plunger, wherein the pump actuator includes a guide sleeve, a U-shaped holder, and a pin shaft roller set, wherein the pin shaft roller set is mounted on the U-shaped holder, and wherein the U-shaped holder is mounted in the guide sleeve; wherein symmetrical positions on a left and a right side walls of the guide sleeve are provided with windows, wherein a left and a right side walls are provided with two flanges respectively, wherein the U-shaped holder includes a bottom plate and side plates that are located on a left and a right side of the bottom plate, wherein upon assembly, the side plate is locked between two flanges; wherein an internal wall of the guide sleeve is provided with a ring groove which recesses inwardly, wherein a back side of the bottom plate is provided with a tail portion whose end surface is arc-shaped, wherein upon assembly, the tail portion is locked in the ring groove.

2. The high-pressure fuel pump actuator used in an engine of claim 1, wherein the U-shaped holder is molded integrally and is incorporated with a spline locking block.

3. The high-pressure fuel pump actuator used in an engine of claim 1, wherein the guide sleeve is molded integrally, wherein the window is provided in a middle position, and wherein an upper portion and a lower portion of the window are of a cylinder structure.

4. The high-pressure fuel pump actuator used in an engine of claim 3, wherein the flange is formed by bending a part of material in the window inwardly.

5. The high-pressure fuel pump actuator used in an engine of claim 3, wherein the pin shaft roller set includes a pin shaft, a roller, and a roller pin, wherein the roller pin is located between the pin shaft and the roller, wherein upon assembly, the pin shaft is provided in an axle hole of the U-shaped holder, wherein the pin shaft is in a suspending state which does not loose in a whole mechanism without hardness assembly; wherein the location of the guide sleeve of the window is arranged to limit the pin shaft axially, such that the pin shaft does not slip out.

6. The high-pressure fuel pump actuator used in an engine of claim 1, wherein the tail portion of the U-shaped holder can completely or partially contact the ring groove of the guide sleeve; wherein a fitting manner of the tail portion and the ring groove can be: a structure of the ring groove being that an internal wall of the guide sleeve recesses inwardly to form a groove, wherein upon assembly, the tail portion is locked in the groove, and wherein the tail portion and the groove are nested in an interference fitting; or the structure of the ring groove being that the internal wall of the guide sleeve is stamped inwardly to form a pair of spaced ribs, wherein the tail portion is pressed between the two ribs through elastic deformation, such that the tail portion is fixed by clamping.

7. The high-pressure fuel pump actuator used in an engine of claim 6, wherein a side wall of the guide sleeve at a lower end of the groove deforms to form a throat.

8. The high-pressure fuel pump actuator used in an engine of claim 6, wherein a side wall of the guide sleeve at a lower end of the groove is provided with a plurality of elastic notches.

9. The high-pressure fuel pump actuator used in an engine of claim 1, wherein a bottom surface of the bottom plate can be a planar structure or a curved surface structure.

10. The high-pressure fuel pump actuator used in an engine of claim 1, wherein the bottom surface of the bottom plate is provided with a protruding platform which projects downwardly, wherein a surface of the protruding platform can be a planar structure, or a curved surface structure; or the bottom surface of the bottom plate is provided with a concave platform which recesses upwardly and inwardly, wherein a surface of the concave platform can be a planar structure or a curved surface structure.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a schematic diagram of the operation of the invention.

(2) FIG. 2 is an assembly drawing of one embodiment of the invention.

(3) FIG. 3 is an explosive view of FIG. 2.

(4) FIG. 4 is a schematic diagram showing the pin shaft the assembly relationship of the present invention.

(5) FIG. 5 is a schematic diagram showing the assembly relationship of the U-shaped holder and guide sleeve in Embodiment 1 of the present.

(6) FIG. 6 is a schematic diagram showing the assembly relationship of the U-shaped holder and guide sleeve in Embodiment 2 of the present.

(7) FIG. 7 is a schematic diagram showing the assembly relationship of the U-shaped holder and guide sleeve in Embodiment 3 of the present.

(8) FIG. 8 is a schematic diagram showing the assembly relationship of the U-shaped holder and guide sleeve in Embodiment 4 of the present.

(9) In the drawings:

(10) 1, guide sleeve; 1.1, flange; 1.2, ring groove; 1.2.1, groove; 1.2.2, rib; 1.2.3, throat; 1.2.4, elastic notch; 1.3, notch; 1.4, window; 2, the U-shaped holder, 2.1, bottom plate; 2.2, side plate; 2.3, axle hole; 2.4, tail portion; 2.5, spline locking block; 3, pin shaft roller set; 3.1, pin shaft; 3.2, roller; 3.3, roller pin; 4, driving cam; 5, fuel pump plunger.

DETAILED DESCRIPTION

(11) The present invention is further described through embodiments and drawings hereinafter.

(12) One Embodiment is: as shown in FIGS. 1 to 3, a high-pressure fuel pump actuator used in an engine, which is used for the fuel injection system in an engine, is mounted between driving cam 4 and fuel pump plunger 5 in the cylinder head of the engine. The pump actuator includes guide sleeve 1, U-shaped holder 2, and pin shaft roller set 3. Guide sleeve 1 is a cylinder structure, which is made from the integral forming process. U-shaped holder 2 is also made from the integral forming process. Pin shaft roller set 3 is mounted on U-shaped holder 2. U-shaped holder 2 is mounted in guide sleeve 1.

(13) The symmetrical positions on the left and the right side walls of guide sleeve 1 are provided with windows 1.4. The left and the right internal walls of guide sleeve 1 are respectively provided with two flanges 1.1. U-shaped holder 2 includes bottom plate 2.1. The left and the right side of bottom plate 2.1 are respectively provided with a piece of upward side plate 2.2. After assembly, side plate 2.2 is locked between two flanges 1.1. Positions on the same horizontal level on two pieces of side plate 2.2 are respectively provided with axle holes 2.3 that are used to mount and support pin shaft roller set 3.

(14) The internal wall of guide sleeve 1 is provided with ring groove 1.2 which recesses inwardly. The bottom of the front side of guide sleeve 1 is provided with notch 1.3. The back side of bottom plate 2.1 is provided with tail portion 2.4 whose end surface is arc-shaped. The front side of bottom plate 2.1 is provided with a projecting spline locking block 2.5. After assembly, tail portion 2.4 is locked in ring groove 1.2. Spline locking block 2.5 is locked in notch 1.3, and projects out of the outer wall of guide sleeve 1.

(15) Referring to FIG. 4, pin shaft roller set 3 includes pin shaft 3.1, roller 3.2 and roller pin 3.3. Roller pin 3.3 is located between pin shaft 3.1 and roller 3.2. After assembly, pin shaft 3.1 is provided in axle hole 2.3 of U-shaped holder. Pin shaft 3.1 is in a suspending state which does not loose in the whole mechanism without hardness assembly.

(16) The number of notch 1.3 in the above embodiment can be two. The bottom of the back side of guide sleeve 1 is provided with notch 1.3 which is the same as that on the front side, wherein both notches are in a pass-through state.

(17) In the embodiments of the present invention, the are shape of the end surface of tail portion 2.4 may have different variations. The purpose that the end surface of tail portion 2.4 completely or partially contacts ring groove 1.2 is achieved.

(18) Moreover, bottom plate 2.1 in the embodiment of the present invention also has different variations.

(19) Embodiment 1 of bottom plate 2.1: bottom plate 2.1 directly pushes against fuel pump plunger 5. the bottom surface of bottom plate 2.1 can be a planar structure or a curved surface structure.

(20) Embodiment 2 of bottom plate 2.1: the bottom surface of bottom plate 2.1 is provided with a protruding platform which projects downwardly. The protruding platform is formed by stamping. The mechanism pushes against fuel pump plunger 5 through the protruding platform. The surface of the protruding platform can be a planar structure or a curved surface structure.

(21) Embodiment 3 of bottom plate 2.1: the bottom surface of bottom plate 2.1 is provided with a concave platform which recesses inwardly. The concave platform is formed by stamping. The mechanism pushes against fuel pump plunger 5 through the concave platform. The surface of the concave platform can be a planar structure or a curved surface structure.

(22) Moreover, in the embodiments of the present invention, the structure of ring groove 1.2 also has different variations. Accordingly, the fitting manner with tail portion 2.4 also has different variations. Details are shown as follows:

(23) Embodiment 1 of fitting manner: referring to FIG. 5, the structure of ring groove 1.2 is that groove 1.2.1 is formed by internal wall recessing inwardly at the mounting position on guide sleeve 1. Tail portion 2.4 and groove 1.2.1 are nested in an interference fitting.

(24) Embodiment 2 of fitting manner: referring to FIG. 6, the structure of ring groove 1.2 is that a pair of open-ended trumpet-shaped ribs 1.2.2 are formed by inwardly stamping the upper and the lower sidewalls at the mounting position on guide sleeve 1. Tail portion 2.4 and ribs 1.2.2 fit with each other using the manner shown in the Figure.

(25) Embodiment 3 of fitting manner: referring to FIG. 7, the differences from Embodiment 1 are as follows. The downside of groove 1.2.1 of guide sleeve 1 is provided with throat 1.2.3 formed by spin riveting. The structure in which throat 1.2.3 is connected to groove 1.2.1 and is bent inwardly towards guide sleeve 1 is formed. After assembly tail portion 2.4 and groove 1.2.1 are connected by riveting. Finally, they fit with each other using the manner shown in the Figure.

(26) Embodiment 4 of fitting manner: referring to FIG. 8, it is suitable for the situation in which the height of guide sleeve 1 is high. The differences from Embodiment 1 are as follows. The downside of groove 1.2.1 of guide sleeve 1 is provided with elastic notch 1.2.4 formed by stamping. Specifically, cutting along the lower edge of groove 1.2.1 is performed. The portion of guide sleeve 1 below the cutting line is stamped inwardly. Elastic notch 1.2.4 can be one or more. Tail portion 2.4 and elastic notch 1.2.4 fit with each other using the manner shown in the Figure.

(27) The above are only the embodiments of the invention, but the structural features of the invention are not limited thereto. The invention can be used in similar products. Any change or modification made by a person with ordinary skill in this art that falls within the scope of the invention, are covered by the patent scope of the invention.