Wear-resistant hydraulic tappet

Abstract

The utility model provides a wear-resistant hydraulic tappet, and belongs to the technical field of tappets. The problem that an existing hydraulic tappet is prone to abrasion is solved. The wear-resistant hydraulic tappet comprises a tappet body and a cam, a plunger is arranged in the tappet body, a one-way valve is arranged at the lower end of the plunger, a plunger return spring is arranged at the lower end of the plunger and located at the outer end of the one-way valve, oil inlet holes for oil feeding are formed in the tappet body and the plunger, a ball seat is arranged on the plunger, and a push rod is arranged on the ball seat. An oil storage layer is arranged in the ball seat, a plurality of oil outlet holes connected with the oil storage layer are formed in the ball seat, and balls are arranged on the oil outlet holes. The utility model has the advantage of wear resistance.

Description

Technical Field

[0001] The utility model belongs to the technical field of tappets and relates to a hydraulic tappet, in particular to a wear-resistant hydraulic tappet. Background Art

[0002] The hydraulic tappet uses the pressure of the engine lubricating oil to adjust its own length to compensate for the valve clearance caused by thermal expansion, wear and other factors in the valve transmission mechanism to a minimum. The hydraulic tappet can keep the engine valve mechanism in good airtightness during operation and ensure the smooth operation of the engine. During use, the inner wall of the tappet body and the plunger will be greatly worn due to the axial movement of the plunger in the tappet body, thus affecting the service life of the plunger.

[0003] When the existing hydraulic tappet is working, the contact mode between the ball seat of the hydraulic tappet and the push rod is generally direct surface contact, so the friction between the ball seat and the push rod is sliding friction. The sliding friction will cause the ball seat and the push rod to wear quickly, resulting in the problem of shortening the practical life of the hydraulic tappet. Summary of the invention

[0004] The utility model aims to provide a hydraulic tappet with long service life and wear resistance in view of the above problems existing in the prior art.

[0005] The purpose of the utility model can be achieved through the following technical solutions: a wear-resistant hydraulic tappet, comprising a tappet body and a cam, characterized in that a plunger is arranged inside the tappet body, a one-way valve is arranged at the lower end of the plunger, a plunger return spring is arranged at the lower end of the plunger and located at the outer end of the one-way valve, an oil inlet hole for oil inlet is provided on the tappet body and the plunger, a ball seat is provided on the plunger, a push rod is provided on the ball seat, an oil reservoir is provided inside the ball seat, a plurality of oil outlet holes connected to the oil reservoir are provided on the ball seat, and balls are provided on the plurality of oil outlet holes.

[0006] In the above-mentioned wear-resistant hydraulic tappet, a mounting groove is provided on the inner wall of the tappet body, and a limiting block for limiting the ball seat is installed on the mounting groove.

[0007] In the above-mentioned wear-resistant hydraulic tappet, an oil injection pipeline is provided on the ball seat, and the oil injection pipeline is connected to the oil storage layer and the inside of the plunger.

[0008] Compared with the prior art, the utility model has a plurality of balls on the ball seat, so that when the push rod is working, the sliding friction between the ball seat and the push rod is changed into rolling friction, thereby reducing the friction force. When the balls move, the oil will automatically be brought out from the oil outlet layer to lubricate the push rod, thereby reducing the friction force and increasing the service life of the push rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a cross-sectional structural schematic diagram of the utility model.

[0010] Figure 2 It is an enlarged schematic diagram of point A of the present utility model.

[0011] In the figure, 1. the push rod body; 2. the cam; 3. the plunger; 4. the one-way valve; 5. the plunger return spring; 6. the oil inlet hole; 7. the ball seat; 8. the push rod; 9. the oil reservoir; 10. the oil outlet hole; 11. the ball; 12. the mounting groove; 13. the limit block; 14. the oil filling pipe. DETAILED DESCRIPTION

[0012] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0013] like Figure 1 , Figure 2 As shown, the wear-resistant hydraulic tappet comprises a tappet body 1 and a cam 2, a plunger 3 is arranged inside the tappet body 1, a one-way valve 4 is arranged at the lower end of the plunger 3, a plunger return spring 5 is arranged at the lower end of the plunger 3 and at the outer end of the one-way valve 4, an oil inlet hole 6 for oil inlet is provided on the tappet body 1 and the plunger 3, a ball seat 7 is provided on the plunger 3, a push rod 8 is provided on the ball seat 7, an oil reservoir 9 is provided inside the ball seat 7, a plurality of oil outlet holes 10 connected to the oil reservoir 9 are provided on the ball seat 7, a plurality of oil outlet holes 10 are provided on the plurality of ball bearings 11, a plurality of ball bearings 11 are provided on the ball seat 7, so that the sliding friction between the ball seat 7 and the push rod 8 is changed into rolling friction when the tappet is working, thereby reducing friction, and when the ball bearings 11 move, oil is automatically brought out from the oil outlet layer to lubricate the push rod 8, thereby reducing friction and improving the service life of the tappet.

[0014] To be more specific, a mounting groove 12 is provided on the inner wall of the tappet body 1 , and a limiting block 13 for limiting the ball seat 7 is installed on the mounting groove 12 .

[0015] To be more specific, an oil injection pipeline 14 is provided on the ball seat 7 , and the oil injection pipeline 14 is connected to the oil reservoir 9 and the inside of the plunger 3 .

[0016] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0017] Although the terms such as tappet body 1, cam 2, plunger 3, check valve 4, plunger return spring 5, oil inlet hole 6, ball seat 7, push rod 8, oil reservoir 9, oil outlet hole 10, ball 11, mounting groove 12, stopper 13, oil injection pipeline 14 are used more frequently in this article, the possibility of using other terms is not excluded. The use of these terms is only for more convenient description and explanation of the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. A wear-resistant hydraulic tappet, comprising a tappet body (1) and a cam (2), characterized in that: The push rod body (1) is provided with a plunger (3) inside, a one-way valve (4) is provided at the lower end of the plunger (3), a plunger return spring (5) is provided at the lower end of the plunger (3) and outside the one-way valve (4), the push rod body (1) and the plunger (3) are provided with an oil inlet hole (6) for oil inlet, the plunger (3) is provided with a ball seat (7), the ball seat (7) is provided with a push rod (8), an oil reservoir (9) is provided inside the ball seat (7), a plurality of oil outlet holes (10) connected to the oil reservoir (9) are provided on the ball seat (7), and a plurality of oil outlet holes (10) are provided with balls (11).

2. A wear-resistant hydraulic tappet according to claim 1, characterized in that: An installation groove (12) is provided on the inner wall of the tappet body (1), and a limiting block (13) for limiting the ball seat (7) is installed on the installation groove (12).

3. The wear-resistant hydraulic tappet according to claim 1, characterized in that: An oil injection pipeline (14) is provided on the ball seat (7), and the oil injection pipeline (14) is connected to the oil storage layer (9) and the inside of the plunger (3).

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