CN219281805U - Wear-resistant hydraulic tappet - Google Patents

Abstract

The utility model discloses a wear-resistant hydraulic tappet which comprises a tappet body, a plunger and a ball seat, wherein the plunger and the ball seat are arranged in the tappet body, a first oil inlet hole is formed in the side wall of the tappet body, the plunger comprises a plunger body, an upper layer wear-resistant ring and a lower layer wear-resistant ring, a second oil inlet hole communicated with the first oil inlet hole is formed in the side wall of the plunger body, the upper layer wear-resistant ring which is in sliding connection with the inner wall of the tappet body is arranged at the upper part of the plunger body, and the lower layer wear-resistant ring which is in sliding connection with the inner wall of the tappet body is arranged at the lower part of the plunger body; the ball seat is connected with the upper end of the plunger body; the lower end of the tappet body is provided with a roller component which is used for being contacted and matched with a cam. The upper layer wear-resistant ring and the lower layer wear-resistant ring with better wear resistance are arranged to replace the plunger body to be in contact with the inner wall of the tappet body, so that the plunger body can be protected, the upper layer wear-resistant ring and the lower layer wear-resistant ring are convenient to assemble and disassemble, and the cost is saved.

Description

Wear-resistant hydraulic tappet

Technical Field

The utility model relates to the technical field of hydraulic lifters, in particular to a wear-resistant hydraulic lifter.

Background

In a piston engine, a hydraulic tappet is arranged between a cam and a valve push rod, so that the valve clearance can be automatically compensated, related parts for adjusting the valve clearance are eliminated, the structure is greatly simplified, and noise and impact caused by the valve clearance are eliminated. The hydraulic tappet comprises a tappet body, a plunger, a ball seat, a plunger spring, a check valve spring and the like. The tappet body and the plunger are provided with oil holes which are communicated with corresponding oil holes on the engine body. The ball seat is a supporting seat of the push rod.

When the cam rotates, the hydraulic tappet is driven to move, the lower end face of the tappet body is always in contact with the cam, sliding friction exists between the tappet body and the cam, and abrasion of the tappet body is easy to cause. The plunger is axially moved in the tappet body, so that friction between the inner wall of the tappet body and the plunger generates abrasion, and the service life of the plunger is influenced especially in the case of impurities.

The foregoing is not necessarily a prior art, and falls within the technical scope of the inventors.

Disclosure of Invention

Based on this, it is necessary to provide a wear-resistant hydraulic lifter in view of the above-mentioned technical problems.

In order to achieve the above purpose, the utility model provides a wear-resistant hydraulic tappet, which comprises a tappet body, a plunger and a ball seat, wherein the plunger and the ball seat are all arranged in the tappet body, a first oil inlet hole is formed in the side wall of the tappet body, the plunger comprises a plunger body, an upper layer wear-resistant ring and a lower layer wear-resistant ring, a second oil inlet hole communicated with the first oil inlet hole is formed in the side wall of the plunger body, the upper layer wear-resistant ring which is in sliding connection with the inner wall of the tappet body is arranged at the upper part of the plunger body, and the lower layer wear-resistant ring which is in sliding connection with the inner wall of the tappet body is arranged at the lower part of the plunger body; the ball seat is connected with the upper end of the plunger body; the plunger body is internally provided with a cavity for containing hydraulic oil, the cavity is communicated with the second oil inlet hole, a containing cavity is formed between the tappet body and the bottom of the plunger, the bottom of the plunger body is provided with a third oil inlet hole which is communicated with the cavity and the containing cavity, and a one-way valve which is used for preventing the hydraulic oil in the containing cavity from flowing from the third oil inlet hole to the cavity is arranged in the containing cavity; the lower end of the tappet body is provided with a roller component which is used for being contacted and matched with a cam.

Preferably, the top of the plunger body is provided with a containing groove, and the lower part of the ball seat is fixedly arranged in the containing groove.

Preferably, a first annular edge and a second annular edge are formed on the outer wall of the plunger body, the first annular edge is located above the second oil inlet hole, the second annular edge is located below the second oil inlet hole, and the first annular edge, the second annular edge and the plunger body form an oil groove communicated with the first oil inlet hole and the second oil inlet hole.

Preferably, the diameter of the upper part of the ball seat is larger than the outer diameter of the plunger body, and the upper abrasion-resistant ring is clamped between the first ring edge and the top of the ball seat.

Preferably, an upper ring groove is formed in the outer wall of the plunger body and located at the inner side of the upper wear-resistant ring, and an upper sealing ring in sealing connection with the upper wear-resistant ring is installed in the upper ring groove.

Preferably, the number of the upper ring grooves is two, one upper ring groove is positioned on the inner side of the upper part of the upper wear-resistant ring, and the other upper ring groove is positioned on the inner side of the lower part of the upper wear-resistant ring.

Preferably, an end cover is fixed at the bottom of the plunger body, the diameter of the end cover is larger than that of the plunger body, and the lower abrasion-resistant ring is clamped between the second ring edge and the end cover.

Preferably, a lower ring groove is formed in the outer wall of the plunger body and located at the inner side of the lower wear-resistant ring, and a lower sealing ring in sealing connection with the lower wear-resistant ring is installed in the lower ring groove.

Preferably, the number of the lower ring grooves is two, one lower ring groove is positioned on the inner side of the upper part of the lower wear-resistant ring, and the other lower ring groove is positioned on the inner side of the lower part of the lower wear-resistant ring.

Preferably, the roller assembly comprises a roller shaft, a roller bearing and a roller, wherein the roller shaft is fixedly connected with the tappet body, and the roller is rotatably arranged on the roller shaft through the roller bearing.

Compared with the prior art, the technical scheme has the following beneficial effects:

the upper layer wear-resistant ring and the lower layer wear-resistant ring are in contact with the inner wall of the tappet body to replace the contact of the plunger body with the outer wall of the tappet body, so that the plunger body can be protected, and the upper layer wear-resistant ring and the lower layer wear-resistant ring are made of wear-resistant materials, so that the wear resistance is improved;

the upper layer wear-resistant ring can be detached by sequentially detaching the clamp spring and the ball seat; after the end cover is detached, the lower layer wear-resistant ring can be detached, and the upper layer wear-resistant ring and the lower layer wear-resistant ring are convenient to assemble and disassemble and simple to operate;

the upper layer wear-resistant ring is inserted into the upper part of the plunger body, so that the lower end of the upper layer wear-resistant ring is abutted against the edge of the upper layer ring, then the ball seat is installed, the edge of the upper part of the ball seat exceeds the edge of the upper part of the plunger body, the upper layer wear-resistant ring can be prevented from moving upwards, the upper layer wear-resistant ring is fixed, and the upper layer wear-resistant ring is firmly fixed; the lower layer wear-resistant ring is inserted into the lower part of the plunger body, the upper end of the lower layer wear-resistant ring is abutted against the edge of the lower layer ring, then the end cover is installed, the edge of the upper part of the end cover exceeds the edge of the lower part of the plunger body, the lower layer wear-resistant ring can be prevented from moving downwards, the lower layer wear-resistant ring is fixed, and the lower layer wear-resistant ring is firmly fixed;

the production cost of the upper layer wear-resistant ring and the lower layer wear-resistant ring is far lower than that of the plunger body, and compared with the replacement of the plunger body, the replacement of the upper layer wear-resistant ring and the lower layer wear-resistant ring saves more cost.

Drawings

FIG. 1 is a schematic diagram of an embodiment of the present utility model;

FIG. 2 is a schematic view of the structure of the plunger body;

in the figure, 1, a tappet body; 11. a first oil inlet hole; 12. a receiving chamber; 13. a limit groove; 2. a plunger; 21. a plunger body; 211. a second oil inlet hole; 212. a cavity; 213. a third oil inlet hole; 214. a receiving groove; 215. a first annular edge; 216. a second annular edge; 217. an upper ring groove; 218. a lower ring groove; 219. a chute; 22. an upper wear ring; 23. a lower wear ring; 24. an upper seal ring; 25. an end cap; 26. a lower seal ring; 3. a ball seat; 4. a one-way valve; 41. a valve ball; 42. a valve seat; 43. a first compression spring; 44. a second compression spring; 5. a roller assembly; 51. a roller shaft; 52. needle roller bearings; 53. a roller; 6. and (5) clamping springs.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.

Referring to fig. 1 and 2, an embodiment of the present application provides a wear-resistant hydraulic tappet, which includes a tappet body 1, a plunger 2 and a ball seat 3, wherein the plunger 2 and the ball seat 3 are all disposed in the tappet body 1, a first oil inlet 11 is disposed on a sidewall of the tappet body 1, the plunger 2 includes a plunger body 21, an upper wear-resistant ring 22 and a lower wear-resistant ring 23, a second oil inlet 211 communicated with the first oil inlet 11 is disposed on a sidewall of the plunger body 21, the upper wear-resistant ring 22 slidingly connected with an inner wall of the tappet body 1 is mounted on an upper portion of the plunger body 21, and the lower wear-resistant ring 23 slidingly connected with the inner wall of the tappet body 1 is mounted on a lower portion of the plunger body 21; the ball seat 3 is connected with the upper end of the plunger body 21, a limit groove 13 is formed in the inner wall of the upper part of the tappet body 1, a clamp spring 6 is clamped in the limit groove 13, the ball seat 3 is limited in the tappet body 1 by the clamp spring 6, and the ball seat 3 can be prevented from being pushed out of the tappet body 1 under the action of hydraulic pressure by the clamp spring 6; a cavity 212 for containing hydraulic oil is arranged in the plunger body 21, the cavity 212 is communicated with the second oil inlet hole 211, a containing cavity 12 is formed between the plunger body 1 and the bottom of the plunger 2, a third oil inlet hole 213 which is communicated with the cavity 212 and the containing cavity 12 is arranged at the bottom of the plunger body 21, and a one-way valve 4 which is used for preventing the hydraulic oil in the containing cavity 12 from flowing from the third oil inlet hole 213 to the cavity 212 is arranged in the containing cavity 12; the roller component 5 which is used for being matched with the cam in a contact way is arranged at the lower end of the tappet body 1, and the roller component 5 changes the sliding friction between the tappet body 1 and the cam into rolling friction so as to reduce abrasion.

The check valve 4 includes a valve ball 41, a valve seat 42, a first compression spring 43, a second compression spring 44, a chute 219 is disposed at the bottom of the plunger body 21, the valve seat 42 is slidably mounted in the chute 219, the valve ball 41 and the first compression spring 43 are located in the valve seat 42, the first compression spring 43 is connected with the valve ball 41 and the valve seat 42, the valve ball 41 is matched with the third oil inlet 213, the lower end of the second compression spring 44 is connected with the bottom of the accommodating cavity 12, and the upper end of the second compression spring 44 is connected with the valve seat 42. By arranging the chute 219, the valve seat 42 can be prevented from falling off the second pressure spring 44, so that the valve seat 42 keeps stably moving; by arranging the first pressure spring 43, the valve ball 41 is ensured to be abutted against the third oil inlet hole 213, so that the sealing performance of the third oil inlet hole 213 is better when the valve ball 41 seals the third oil inlet hole 213; meanwhile, the first pressure spring 43 is arranged to enable the valve ball 41 to be compressed firstly when being pressed downwards, so that the service life of the second pressure spring 44 is guaranteed.

The roller assembly 5 comprises a roller shaft 51, a needle bearing 52 and a roller 53, wherein the roller shaft 51 is fixedly connected with the tappet body 1, and the roller 53 is rotatably arranged on the roller shaft 51 through the needle bearing 52. The roller 53 is in direct contact with the cam. The rolling of the needle roller of the needle bearing 52 replaces the sliding friction between the tappet body 1 and the cam, so that the abrasion is reduced.

In order to facilitate the installation of the ball seat 3, the top of the plunger body 21 is provided with a containing groove 214, and the lower part of the ball seat 3 is fixedly installed in the containing groove 214.

In order to enable the first oil inlet 11 to be communicated with the second oil inlet 211, a first annular edge 215 and a second annular edge 216 are formed on the outer wall of the plunger body 21, the first annular edge 215 is located above the second oil inlet 211, the second annular edge 216 is located below the second oil inlet 211, and the first annular edge 215, the second annular edge 216 and the plunger body 21 form an oil groove which is communicated with the first oil inlet 11 and the second oil inlet 211.

To facilitate the installation of the upper wear ring 22, the diameter of the upper part of the ball seat 3 is larger than the outer diameter of the plunger body 21, and the upper wear ring 22 is clamped between the first annular edge 215 and the top of the ball seat 3.

In order to keep the upper layer wear-resistant ring 22 sealed with the outer wall of the plunger body 21, an upper layer ring groove 217 is arranged on the outer wall of the plunger body 21 and positioned at the inner side of the upper layer wear-resistant ring 22, and an upper layer sealing ring 24 in sealing connection with the upper layer wear-resistant ring 22 is arranged in the upper layer ring groove 217.

In order to improve the sealing effect between the upper layer wear-resistant ring 22 and the outer wall of the plunger body 21 and to balance the clearance between the upper layer wear-resistant ring 22 and the outer wall of the plunger body 21, two upper layer ring grooves 217 are provided, wherein one upper layer ring groove 217 is positioned at the inner side of the upper part of the upper layer wear-resistant ring 22, and the other upper layer ring groove 217 is positioned at the inner side of the lower part of the upper layer wear-resistant ring 22.

In order to facilitate the installation of the lower wear-resistant ring 23, an end cover 25 is fixed at the bottom of the plunger body 21, the diameter of the end cover 25 is larger than the outer diameter of the plunger body 21, and the lower wear-resistant ring 23 is clamped between the second ring edge 216 and the end cover 25.

In order to keep the lower wear-resistant ring 23 sealed with the outer wall of the plunger body 21, a lower ring groove 218 is formed in the outer wall of the plunger body 21 and positioned at the inner side of the lower wear-resistant ring 23, and a lower sealing ring 26 in sealing connection with the lower wear-resistant ring 23 is arranged in the lower ring groove 218.

In order to improve the sealing effect between the lower wear ring 23 and the outer wall of the plunger body 21, the clearance between the lower wear ring 23 and the outer wall of the plunger body 21 is balanced, two lower ring grooves 218 are provided, one lower ring groove 218 is located at the inner side of the upper part of the lower wear ring 23, and the other lower ring groove 218 is located at the inner side of the lower part of the lower wear ring 23.

In the actual working process, the cam rotates to push the roller 53 to rotate and lift, so as to drive the tappet body 1 to lift; hydraulic oil enters the oil groove through the first oil inlet hole 11 and then enters the cavity 212 through the second oil inlet hole 211, and along with the increase of the oil quantity of the cavity 212, the pressure is increased, so that the valve ball 41 is pushed to move downwards, and the hydraulic oil enters the accommodating cavity 12 through a gap between the valve ball 41 and the third oil inlet hole 213; as the oil quantity entering the accommodating cavity 12 is increased, the pressure in the accommodating cavity 12 is increased, a high-pressure cavity is formed in the accommodating cavity 12, and then the plunger 2 is pushed to move upwards, so that the movement of the push rod is completed;

the upper layer wear-resistant ring 22 and the lower layer wear-resistant ring 23 are contacted with the inner wall of the tappet body, so that the tappet body 21 is protected instead of the contact between the tappet body 21 and the outer wall of the tappet body, the upper layer wear-resistant ring 22 and the lower layer wear-resistant ring 23 can be made of wear-resistant materials, when the upper layer wear-resistant ring 22 and the lower layer wear-resistant ring 23 are worn and need to be replaced, the snap springs and the ball seat 3 can be detached in sequence, then the upper layer wear-resistant ring 22 can be detached, a new upper layer wear-resistant ring 22 is replaced and inserted into the upper part of the tappet body 21 to be abutted with the edge of the upper layer ring, then the ball seat 3 is installed, the edge of the upper part of the ball seat 3 exceeds the edge of the upper part of the tappet body 21, the upper layer wear-resistant ring 22 can be prevented from moving upwards, and the upper layer wear-resistant ring 22 is fixed; after the end cover 25 is detached, the lower layer wear-resistant ring 23 can be detached, a new lower layer wear-resistant ring 23 is replaced and inserted into the lower part of the plunger body 21 to be abutted with the lower layer ring edge, then the end cover 25 is installed, the edge of the upper part of the end cover 25 exceeds the edge of the lower part of the plunger body 21, the lower layer wear-resistant ring 23 can be prevented from moving downwards, and the lower layer wear-resistant ring 23 is fixed. By arranging the upper layer wear-resistant ring 22 and the lower layer wear-resistant ring 23, materials with better wear resistance, such as wear-resistant alloy and wear-resistant ceramic, the wear resistance is improved, and compared with the replacement of the plunger body 21, the replacement of the upper layer wear-resistant ring 22 and the lower layer wear-resistant ring 23 saves more cost.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

Claims (10)

1. The wear-resistant hydraulic tappet comprises a tappet body (1), a plunger (2) and a ball seat (3), wherein the plunger (2) and the ball seat (3) are arranged in the tappet body (1), a first oil inlet hole (11) is formed in the side wall of the tappet body (1), and the wear-resistant hydraulic tappet is characterized in that the plunger (2) comprises a plunger body (21), an upper layer wear-resistant ring (22) and a lower layer wear-resistant ring (23), a second oil inlet hole (211) communicated with the first oil inlet hole (11) is formed in the side wall of the plunger body (21), an upper layer wear-resistant ring (22) which is in sliding connection with the inner wall of the tappet body (1) is arranged on the upper portion of the plunger body (21), and a lower layer wear-resistant ring (23) which is in sliding connection with the inner wall of the tappet body (1) is arranged on the lower portion of the plunger body (21); the ball seat (3) is connected with the upper end of the plunger body (21); a cavity (212) for containing hydraulic oil is formed in the plunger body (21), the cavity (212) is communicated with the second oil inlet hole (211), a containing cavity (12) is formed between the plunger body (1) and the bottom of the plunger (2), a third oil inlet hole (213) for communicating the cavity (212) with the containing cavity (12) is formed in the bottom of the plunger body (21), and a one-way valve (4) for preventing the hydraulic oil in the containing cavity (12) from flowing from the third oil inlet hole (213) to the cavity (212) is arranged in the containing cavity (12); the lower end of the tappet body (1) is provided with a roller component (5) which is used for being in contact fit with a cam.

2. The wear-resistant hydraulic tappet according to claim 1, characterized in that the plunger body (21) is provided with a receiving groove (214) at the top, and the lower part of the ball seat (3) is fixedly mounted in the receiving groove (214).

3. The wear-resistant hydraulic tappet of claim 2, wherein a first annular edge (215) and a second annular edge (216) are formed on the outer wall of the plunger body (21), the first annular edge (215) is located above the second oil inlet hole (211), the second annular edge (216) is located below the second oil inlet hole (211), and the first annular edge (215), the second annular edge (216) and the plunger body (21) form an oil groove communicating the first oil inlet hole (11) and the second oil inlet hole (211).

4. A wear resistant hydraulic tappet according to claim 3, characterized in that the upper diameter of the ball seat (3) is larger than the outer diameter of the plunger body (21), and that the upper wear ring (22) is clamped between the first rim (215) and the top of the ball seat (3).

5. The wear-resistant hydraulic tappet according to claim 4, wherein an upper ring groove (217) is formed in the outer wall of the plunger body (21) and located inside the upper wear-resistant ring (22), and an upper sealing ring (24) in sealing connection with the upper wear-resistant ring (22) is mounted in the upper ring groove (217).

6. The wear-resistant hydraulic tappet of claim 5, wherein the upper ring grooves (217) are provided in two, wherein one upper ring groove (217) is located inside an upper portion of the upper wear ring (22), and the other upper ring groove (217) is located inside a lower portion of the upper wear ring (22).

7. A wear-resistant hydraulic tappet according to claim 3, characterized in that an end cap (25) is fixed to the bottom of the plunger body (21), the diameter of the end cap (25) is larger than the outer diameter of the plunger body (21), and the lower wear ring (23) is clamped between the second ring edge (216) and the end cap (25).

8. The wear-resistant hydraulic tappet according to claim 4, characterized in that a lower ring groove (218) is provided on the outer wall of the plunger body (21) and inside the lower wear ring (23), and a lower sealing ring (26) in sealing connection with the lower wear ring (23) is provided in the lower ring groove (218).

9. The wear-resistant hydraulic lifter according to claim 8, characterized in that the number of lower ring grooves (218) is two, wherein one lower ring groove (218) is located inside the upper portion of the lower wear ring (23) and the other lower ring groove (218) is located inside the lower portion of the lower wear ring (23).

10. The wear-resistant hydraulic tappet according to claim 1, characterized in that the roller assembly (5) comprises a roller shaft (51), a needle bearing (52) and a roller (53), the roller shaft (51) being fixedly connected to the tappet body (1), the roller (53) being rotatably mounted on the roller shaft (51) by means of the needle bearing (52).

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