HIGH PRESSURE OIL PUMP ROLLER TAPPET

Abstract

A high-pressure oil pump roller tappet, used for automobile fuel injection system, mounted between the driving cam and the tappet. The roller tappet includes a shell, a holder, a roller, and a pin. Planes A are arranged on both sides of the seam on lateral sides of the shell. Holes I are arranged at symmetrical positions on two planes A. Holes II are arranged on symmetrical positions on vertical plates. The roller is located in the middle of the pin. Welding has no requirement on the thickness of the plate. The weight can be controlled effectively, reducing inertia force, friction, and wear, improving engine efficiency. The shell and holder are designed as being separate, ensuring that the shell subjects to lateral force as little as possible when the holder subjects to a force, such that the shell is less likely to vibrate. Thus, the shell avoids the abrasion.

Claims

1. A high-pressure oil pump roller tappet, used in an automobile fuel injection system, mounted between a driving cam (5) and a tappet (6), wherein: the roller tappet comprises a shell (1), a holder (2), a roller (3), and a pin (4); wherein the shell (1) whose main structure is a cylindrical housing is made by bending a steel plate in a surrounding way; wherein planes A (1.2) that are in parallel and symmetrical with each other are arranged on both sides of a seam (1.4) on lateral sides of the shell; wherein holes I (1.1) are arranged at symmetrical positions on the two planes A (1.2), wherein the holder (2) is of a U-shape, holes II (2.1) are arranged at symmetrical positions on vertical plates; wherein the roller (3) is located in the middle of the pin (4), and wherein two ends of the pin (4) passes through the holes I (1.1) and the holes II (2.1) respectively.

2. The high-pressure oil pump roller tappet according to claim 1, wherein steel plates on the both ends of the seam (1.4) are pre-stamped to form inward recesses, and welding spots (1.3) are provided therein.

3. The high-pressure oil pump roller tappet according to claim 2, wherein a locking block is arranged on the seam (1.4) between the welding spots (1.3) or on the shell 1 opposing the seam (1.4); wherein the locking block is a sector cylinder made by stamping, which protrudes from the shell; and wherein the locking block can be a short locking block I (1.5) or a long locking block II (1.7).

4. The high-pressure oil pump roller tappet according to claim 1, wherein all lateral planes of the shell (1) on which the planes A (1.2) located are of planar structure.

5. The high-pressure oil pump roller tappet according to claim 1, wherein a lower portion of a lateral plane on which the plane A (1.2) is located is of a cylindrical structure.

6. The high-pressure oil pump roller tappet according to claim 5, wherein the plane A (1.2) is stamped inwardly to form a bayonet (1.6) between the plane A (1.2) and a lower portion of the cylindrical structure; and wherein two vertical plates of the holder (2) can pass through the bayonet (1.6).

7. The high-pressure oil pump roller tappet according to claim 1, wherein the baseplate of the holder (2) can be a baseplate I (2.2) with a projecting curved surface structure or a baseplate II (2.3) with a planar structure.

8. The high-pressure oil pump roller tappet according to claim 7, wherein a groove (2.4) is arranged on the underside of the baseplate of the holder (2), and wherein a boss (2.5) is formed on the upper side of the baseplate of the holder accordingly.

9. The high-pressure oil pump roller tappet according to claim 1, wherein a plurality of ribs (2.6) are arranged on bending parts between vertical plates and baseplates of the holder (2).

10. The high-pressure oil pump roller tappet according to claim 1, wherein both ends of the pin (4) can be a plane B (4.1) or a curved surface (4.2), and wherein a curvature of the curved surface (4.2) is the same as that of the shell (1).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0025] FIG. 1 is a schematic diagram of the operation of the invention.

[0026] FIG. 2 is an assembly drawing of one embodiment of the invention.

[0027] FIG. 3 is an explosive view of FIG. 2.

[0028] FIG. 4 is a schematically structural diagram of Embodiment 1 of the housing of the invention.

[0029] FIG. 5 is a schematically structural diagram of Embodiment 2 of the housing of the invention.

[0030] FIG. 6 is a schematically structural diagram of Embodiment 3 of the housing of the invention.

[0031] FIG. 7 is a schematically structural diagram of Embodiment 4 of the housing of the invention.

[0032] FIG. 8 is the schematically structural diagram of Embodiment 1 of the holder of the invention.

[0033] FIG. 9 is a schematically structural diagram of Embodiment 2 of the holder of the invention.

[0034] FIG. 10 is a schematically structural diagram of Embodiment 3 of the holder of the invention.

[0035] FIG. 11 is a bottom structural view of FIG. 10.

[0036] FIG. 12 is a schematically structural diagram of Embodiment 4 of the holder of the invention.

[0037] FIG. 13 is the bottom schematically a structural view of FIG. 12.

[0038] FIG. 14 is the schematically structural diagram of Embodiment 5 of the holder of the invention.

[0039] FIG. 15 is the schematically structural diagram of Embodiment 1 of the pin of the invention.

[0040] FIG. 16 is the schematically structural diagram of Embodiment 2 of the pin of the invention.

IN THE DRAWINGS

[0041] 1 shell; 1.1 hole I; 1.2 plane A; 1.3 welding spot; 1.4 seam; 1.5 locking block I; 1.6 bayonet; 1.7 locking block II; 2 holder; 2.1 hole II; 2.2 baseplate I; 2.3 baseplate II; 2.4 groove; 2.5 boss; 2.6 rib; 3 roller; 4 pin; 4.1 plane B; 4.2 curved surface; 5 driving cam; 6 tappet.

DETAILED DESCRIPTION

[0042] The present invention is further illustrated by embodiments and drawings hereinafter:

[0043] The embodiment is: as shown in FIGS. 1 to 3, a high-pressure oil pump roller tappet, which is used for an automobile fuel injection system, is mounted between a driving cam 5 and a tappet 6. The roller tappet includes a shell 1, a holder 2, a roller 3, and a pin 4. The shell 1 whose main structure is a cylindrical housing is made by bending a steel plate in a surrounding way. Planes A 1.2 that are in parallel and symmetrical with each other are arranged on both sides of a seam 1.4 on lateral sides of the shell. Holes I 1.1 are arranged at symmetrical positions on the two planes A 1.2. The holder 2 is of a U-shaped. Holes II 2.1 are arranged at symmetrical positions on vertical plates. The roller 3 is located in the middle of the pin 4. Two ends of the pin 4 pass through the holes I 1.1 and the holes II 2.1 respectively.

[0044] The steel plates on both ends of the seam 1.4 are pre-stamped to form inward recesses, and welding spots 1.3 are provided therein. A locking block is arranged on the seam 1.4 between the welding spots 1.3 or on the shell 1 opposing the seam 1.4. The locking block is a sector cylinder made by stamping, which protrudes from the shell. The length of the locking block can be adjusted between the two welding spots to fit sizes of different oil pump cylinders.

[0045] In the embodiment of the invention, the shell 1, the holder 2, and the pin 4 have many different variations.

[0046] Among them, variations of the shell 1 include:

Embodiment 1

[0047] As shown in FIG. 4, all of the lateral planes of the shell 1 on which the planes A 1.2 located are of the planar structure. The locking block is a short locking block I 1.5.

Embodiment 2

[0048] As shown in FIG. 5, the lower portion of the lateral plane of the shell 1 on which the plane A 1.2 is located is a cylindrical structure. The locking block is the short locking block I 1.5

Embodiment 3

[0049] As shown in FIG. 6, the lower portion of the lateral plane of the shell 1 on which the plane A 1.2 is located is of the cylindrical structure. The plane A 1.2 is stamped inwardly, and thereby a bayonet 1.6 is formed between the plane A 1.2 and the lower portion of the cylindrical structure. The vertical plates of the holder 2 can pass through the bayonet 1.6. The locking block is the short locking block I 1.5

Embodiment 4

[0050] As shown in FIG. 7, the lateral planes on the shell 1 on which the planes A 1.2 are located are all of the planar structure. The difference with respect to Embodiment 1 is that the locking block is a long locking block 111.7.

[0051] Obviously, the structure of the locking block I 1.7 in Embodiment 4 of the shell 1.7 can also be applied to Embodiment 2 and Embodiment 3

[0052] Moreover, in Embodiment 1 and Embodiment 4 of the shell 1, the weight can be reduced by punching holes in the plane A 1.2.

[0053] Among them, variations of the holder 2 include:

Embodiment 1

[0054] As shown in FIG. 8, the baseplate of the holder 2 is the baseplate I 2.2 which has a projecting curved structure.

Embodiment 2

[0055] As shown in FIG. 9, the baseplate of the holder 2 is the baseplate 112.3 which has a planar structure.

Embodiment 3

[0056] As shown in FIG. 10 and FIG. 11, the baseplate of the holder 2 is the baseplate I 2.2 which has a projecting curved structure. A groove 2.4 is arranged on the underside of the baseplate I 2.2. A boss 2.5 is formed on the upper side of the baseplate I 2.2 accordingly.

Embodiment 4

[0057] As shown in FIG. 12 and FIG. 13, the baseplate of the holder 2 is the baseplate II 2.3 which has a planar structure. A groove 2.4 is arranged on the underside of the baseplate II 2.3. A boss 2.5 is formed on the upper side of the baseplate II 2.3 accordingly.

Embodiment 5

[0058] As shown in FIG. 14, the baseplate of the holder 2 is the baseplate II 2.3 which has a planar structure. The difference with respect to Embodiment 2 lies in that a plurality of the ribs 2.6 are arranged on bending parts between the vertical plates and the baseplate of the holder 2.

[0059] Obviously, the structure of the rib 2.6 in Embodiment 5 of the holder 2 can also be applied to Embodiment 1, Embodiment 3, and Embodiment 4.

[0060] Among them, variations of the pin 4 include:

Embodiment 1

[0061] As shown in FIG. 15, both ends of the pin 4 are of planes B 4.1.

Embodiment 2

[0062] As shown in FIG. 16, both ends of the pin 4 are of curved surfaces 4.2. The curvature of the curved surface 4.2 is the same as that of the shell 1.

[0063] Moreover, if necessary, when assembling, various embodiments of the shell 1, the holder 2, and the pin 4 as described above can be combined freely.

[0064] The above is only the embodiments of the invention, but the structural features of the invention are not limited thereto. The invention can be used in similar production. Any changes or modifications made by a person with ordinary skill in this art that fall in the field of the invention, are within the patent scope of the invention.