Chain wheel with pressure reducing holes and pressure reducing pieces

Abstract

A chain wheel with decompression holes and decompression pieces belongs to the technical field of chain wheels and comprises a chain wheel body, a plurality of decompression holes are evenly distributed on one side, close to a tooth root, of the chain wheel body around the axis, and the decompression pieces are arranged in the decompression holes. Impact force borne by the chain wheel body can be relieved through the pressure relief holes, the pressure relief pieces made of nitrile rubber are arranged in the pressure relief holes, and the nitrile rubber is installed in the pressure relief holes in an injection molding mode due to the fact that the nitrile rubber has the characteristics of high heat resistance, abrasion resistance, hardness and elasticity. The overall appearance size of the chain wheel can be prevented from being changed due to deformation of the decompression holes, impact loads are digested, and the service life of the chain wheel is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of sprockets, and in particular relates to a sprocket provided with a pressure relief hole and a pressure relief sheet. Background Art

[0002] The engine timing system, balance shaft system, and oil pump system rely on sprockets to drive the chain transmission, and the thickness of the transmission sprocket inside the engine is relatively thin. The sprocket will be subjected to huge impact force under extreme conditions such as ultra-high engine speed operation and large gear speed difference. When a 2.85mm thick sprocket is subjected to a large load impact in this situation, the sprocket will wear or even break. Utility Model Content

[0003] In view of the problems of the prior art, the invention discloses a sprocket with a pressure relief hole and a pressure relief sheet, aiming at improving the fatigue strength and service life of the engine sprocket.

[0004] To achieve the above purpose, the technical solution of this novel invention is:

[0005] A sprocket with pressure relief holes and pressure relief plates comprises a sprocket body. A side of the sprocket body close to the tooth root is provided with a plurality of pressure relief holes evenly distributed around an axis. Pressure relief plates are arranged in the pressure relief holes.

[0006] Preferably, there are four pressure relief holes, and the pressure relief sheet is made of nitrile rubber material.

[0007] Preferably, the inner and outer ends of the pressure reducing hole are first arc-shaped structures coaxial with the sprocket body, and the left and right ends are second arc-shaped structures.

[0008] Preferably, the pressure relief sheet comprises an arc-shaped block for filling the pressure relief hole.

[0009] Preferably, the outer edges of the upper and lower ports of the pressure reducing hole are respectively provided with fixing grooves, and the upper and lower ends of the arc-shaped block are respectively integrally formed with fixing sheets that are engaged with the fixing grooves.

[0010] Preferably, the pressure reducing sheet is installed in the pressure reducing hole by injection molding.

[0011] Preferably, the sprocket body is a 34T standard toothed sprocket with a thickness of 2.85 mm and is precision-punched from 20CrMo material.

[0012] The beneficial effects of the sprocket with pressure relief holes and pressure relief plates are as follows:

[0013] (1) The new type increases the service life of the sprocket under extreme conditions and is particularly suitable for use in engines.

[0014] (2) The new type improves the fatigue strength of the sprocket as a whole in any scenario.

[0015] (3) The pressure relief hole provided in the present invention not only has a pressure relief effect, but also replaces the function of the weight reduction hole, thereby reducing the weight of the sprocket. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 , schematic diagram of the assembly structure of the new model.

[0017] Figure 2 , schematic diagram of the structure of the new pressure relief sheet.

[0018] Figure 3 , a schematic diagram of the structure of the new sprocket body.

[0019] 1. Sprocket body; 2. Pressure relief hole; 3. Fixing groove; 4. Pressure relief plate; 41. Arc block; 42. Upper fixing plate; 43. Lower fixing plate. DETAILED DESCRIPTION

[0020] The following description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0021] The following embodiments may be understood as a part of a local structure or method that is expressed separately in the present invention, or may be understood as a combination of the embodiments to explain the connotation of a larger structure or method of the present invention.

[0022] Example 1

[0023] A sprocket with a pressure relief hole and a pressure relief sheet, such as Figure 1-3 As shown, it comprises a sprocket body 1 , wherein a plurality of pressure relief holes 2 are evenly distributed around the axis on one side of the sprocket body 1 close to the tooth root, and a pressure relief sheet 4 is arranged in the pressure relief hole 2 .

[0024] Example 2

[0025] like Figure 2 , 3 As shown, there are four pressure reducing holes 2, and the pressure reducing sheet 4 is made of nitrile rubber material.

[0026] Example 3

[0027] like Figure 3 As shown, the inner and outer ends of the pressure reducing hole 2 are first arc-shaped structures coaxial with the sprocket body 1, and the left and right ends are second arc-shaped structures.

[0028] Example 4

[0029] like Figure 2As shown, the pressure relief sheet 4 includes an arc-shaped block 41 for filling the pressure relief hole 2 .

[0030] Example 5

[0031] like Figure 2 , 3 As shown, the outer edges of the upper and lower ports of the pressure reducing hole 2 are respectively provided with fixing grooves 3, and the upper and lower ends of the arc block 41 are respectively integrally formed with fixing plates engaged with the fixing grooves, namely an upper fixing plate 42 and a lower fixing plate 43.

[0032] Example 6

[0033] like Figure 1-3 As shown, the pressure reducing sheet 4 is installed in the pressure reducing hole 2 by injection molding.

[0034] Example 7

[0035] like Figure 3 As shown, the sprocket body 1 is a 34T standard toothed sprocket with a thickness of 2.85 mm and is precision punched from 20CrMo material.

[0036] The novel device can relieve the impact force exerted on the sprocket body by setting a pressure relief hole, and a pressure relief sheet made of nitrile rubber is installed in the pressure relief hole. Since nitrile rubber has strong heat resistance, wear resistance, hardness and elasticity, it is installed in the pressure relief hole by injection molding, which can suppress the deformation of the pressure relief hole that causes changes in the overall appearance size of the sprocket, absorb the impact load, and thus extend the service life of the sprocket.

Claims

1. A sprocket with a pressure relief hole and a pressure relief sheet, characterized by: The sprocket body comprises a sprocket body, wherein a plurality of pressure relief holes are evenly distributed around the axis on one side of the sprocket body close to the tooth root, and pressure relief plates are arranged in the pressure relief holes.

2. A sprocket with a pressure relief hole and a pressure relief sheet as claimed in claim 1, characterized in that: There are four pressure reducing holes, and the pressure reducing sheet is made of nitrile rubber material.

3. A sprocket with a pressure relief hole and a pressure relief sheet as claimed in claim 2, characterized in that: The inner and outer ends of the pressure reducing hole are first arc-shaped structures coaxial with the sprocket body, and the left and right ends are second arc-shaped structures.

4. A sprocket with a pressure relief hole and a pressure relief sheet as claimed in claim 3, characterized in that: The pressure relief sheet comprises an arc-shaped block for filling the pressure relief hole.

5. A sprocket with a pressure relief hole and a pressure relief sheet as claimed in claim 4, characterized in that: The outer edges of the upper and lower ports of the pressure reducing hole are respectively provided with fixing grooves, and the upper and lower ends of the arc-shaped block are respectively integrally formed with fixing sheets which are clamped with the fixing grooves.

6. A sprocket with a pressure relief hole and a pressure relief sheet as claimed in any one of claims 1 to 5, characterized in that: The pressure reducing sheet is installed in the pressure reducing hole by injection molding.

7. A sprocket with a pressure relief hole and a pressure relief sheet as claimed in any one of claims 1 to 5, characterized in that: The sprocket body is a 34T standard toothed sprocket with a thickness of 2.85mm and is formed by precision punching of 20CrMo material.

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