Oil leakage prevention assembly of automobile shock absorber

Abstract

The invention relates to the field of automobile shock absorbers, in particular to an oil leakage prevention assembly of an automobile shock absorber, which comprises a guider main body, a groove and a suspension valve groove are arranged on the inner wall of the upper end of the guider main body, and the groove and the suspension valve groove are processed and formed on the upper part of the inner wall of the guider main body. The suspension valve groove is formed in the inner wall of the guider body in a post-processing mode, a fixed sealing structure of a traditional shock absorber guider is broken through, and the essential difference between the suspension valve groove and an existing guider is the dynamic response capacity of the suspension valve groove. Precise control over oil overflowing is achieved through the alternate effect of mechanical blocking and releasing, specifically, under the high-pressure working condition, the O-shaped ring is pushed by oil pressure to be tightly attached to the groove wall, an oil leakage path is instantly blocked, under the low-pressure working condition, the O-shaped ring falls back to allow oil to overflow through the oil return hole, and internal circulation is formed to lubricate the inner wall of the guider; therefore, the contradiction that traditional plugging type sealing cannot meet the requirements of high-pressure sealing and lubrication is solved.

Description

Technical Field

[0001] The invention belongs to the field of automobile shock absorbers, and in particular relates to an anti-oil leakage component of an automobile shock absorber. Background Art

[0002] As the core component of the vehicle suspension system, the performance of automobile shock absorbers directly affects the vehicle's driving stability and ride comfort. During the reciprocating motion of the shock absorber, the internal oil is subjected to periodic high-pressure loads, which can easily lead to seal failure and oil leakage after long-term operation, seriously affecting the service life of the shock absorber and the safety performance of the vehicle.

[0003] In the prior art, some products use an open-type leak-proof ring structure on the upper part of the guide and the guide bearing to alleviate the oil leakage problem. The leak-proof ring forms a certain obstruction to the flow of oil through mechanical contact, which can reduce oil leakage under normal working conditions. However, when the oil pressure inside the shock absorber exceeds the threshold, the open-type leak-proof ring cannot form an effective seal, resulting in continuous oil leakage. At the same time, the wear caused by long-term reciprocating motion will further reduce the sealing performance, shortening the average service life of existing products, making it difficult to meet the needs of long-term stable operation of vehicles. In addition, the traditional sealing design adopts a plugging method, which fails to take into account the coordinated needs of lubrication and sealing, resulting in accelerated wear of key moving parts due to lack of lubrication, further exacerbating the risk of oil leakage. Summary of the invention

[0004] In order to overcome the problems of sealing failure, increased wear and insufficient lubrication of the existing automobile shock absorber oil leakage prevention assembly under high pressure conditions, an automobile shock absorber oil leakage prevention assembly is proposed.

[0005] The technical solution of the present invention is: an automobile shock absorber oil leakage prevention component, comprising: a guide body, the inner wall of the upper end of which is provided with a groove;

[0006] A suspension valve groove is formed on the upper portion of the inner wall of the guide body and surrounds the inner wall of the guide body;

[0007] An O-ring is installed in the suspension valve groove. When the oil flow produces pressure changes during the operation of the automobile shock absorber, the O-ring moves up and down in the suspension valve groove;

[0008] The first oil return hole is arranged on the inner wall of the guide body, is a circular hole with a diameter of 2.5 mm, and is 3 in number and evenly distributed in a row;

[0009] An oil seal, the outer wall of which is arranged in contact with the inner wall of the groove of the guide body;

[0010] A piston is slidably disposed inside the working cylinder and connected to the lower part of the piston rod;

[0011] A bottom valve, fixedly installed below the working cylinder and located below the piston;

[0012] The second oil return hole is set at 5mm directly below the floating valve groove, is a round hole with a diameter of 2.5mm, and has 3 holes evenly distributed in a row;

[0013] An oil collecting space is formed below the oil seal and at the upper end of the first oil return hole.

[0014] Furthermore, the depth of the floating valve groove is 3 mm, the width is 3 mm, the outer diameter of the O-ring is 2.65 mm, and the floating valve groove and the outer diameter of the O-ring are loosely matched.

[0015] Furthermore, the first oil return hole is located below the floating valve groove, and the vertical distance between the first oil return hole and the floating valve groove is 10 mm.

[0016] Furthermore, the outer diameter of the guide body is 37±0.05 mm.

[0017] Furthermore, the O-ring and the oil seal are made of high-density materials.

[0018] Furthermore, the piston is made of a high pressure-resistant sealing material.

[0019] Furthermore, the bottom valve is made of high-strength and wear-resistant material.

[0020] Beneficial effects of the present invention:

[0021] 1. The present invention forms a suspension valve groove on the inner wall of the guide body, breaking through the fixed sealing structure of the traditional shock absorber guide. The essential difference between the suspension valve groove and the existing guide lies in its dynamic response capability: when the shock absorber is working, the oil pressure changes drive the O-ring to move up and down in the groove, and the oil overflow is precisely controlled by the alternating action of mechanical blocking and release. Specifically, under high-pressure conditions, the O-ring is pushed by the oil pressure to stick to the groove wall, instantly blocking the oil leakage path. Under low pressure, the O-ring falls back to allow the oil to overflow through the first oil return hole, forming an internal circulation to lubricate the inner wall of the guide, thereby solving the contradiction that the traditional plugging seal cannot take into account both high-pressure sealing and lubrication requirements;

[0022] 2. The post-processing technology of the suspension valve groove and the loose fit relationship with the O-ring not only ensure the flexible movement ability of the O-ring, but also form a dynamic sealing surface through contact stress. Its sealing performance is significantly better than the passive contact method of the existing open-type leak-proof ring. At the same time, the post-processing technology allows the groove position to be accurately located on the formed guide body, avoiding the limitations of the traditional integral structure in processing accuracy and cost;

[0023] 3. The dynamic sealing mechanism is combined with the uniform design of the first oil return hole to construct a unique oil circulation system: after lubricating the contact surface between the piston and the guide, the oil flows back to the working chamber through the first oil return hole, which not only reduces the risk of external leakage, but also avoids abnormal wear caused by insufficient lubrication. Combined with the self-lubricating properties of high-density oil-containing materials, the wear rate of key moving parts is greatly reduced, significantly extending the service life of the shock absorber;

[0024] 4. Since the O-ring can be deformed, when the hydraulic oil is under low pressure, some hydraulic oil overflows to lubricate the oil seal. Under high pressure conditions, when the oil pressure increases, the O-ring is lifted up and pressed against the groove wall, blocking the oil leakage channel. At this time, the oil can only flow through the internal circulation. The oil returns to the oil storage cylinder through the second oil return hole just below the suspension valve groove, forming a forced circulation, so that the oil completes the circulation without contacting the oil seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Shown is a cross-sectional view of the present invention;

[0026] Figure 2 Shown is a cross-sectional view of the O-ring of the present invention;

[0027] Figure 3 The present invention is shown Figure 2 A local enlarged schematic diagram of point A in FIG.

[0028] Figure 4 What is shown is a schematic diagram of the three-dimensional structure of the present invention.

[0029] The markings in the attached figure are: 1. guide body; 2. suspension valve groove; 3. O-ring; 4. first oil return hole; 5. oil seal; 6. piston; 7. bottom valve; 8. second oil return hole; 9. oil collecting space. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0031] See also Figures 1-4 The present invention provides an embodiment: an automobile shock absorber oil leakage prevention component, comprising:

[0032] The guide body 1 has a groove on its upper inner wall;

[0033] The suspension valve groove 2 is formed on the upper part of the inner wall of the guide body 1 and surrounds the inner wall of the guide body 1;

[0034] An O-ring 3 is installed in the suspension valve groove 2. When the oil flow produces pressure changes during the operation of the automobile shock absorber, the O-ring 3 moves up and down in the suspension valve groove 2;

[0035] The first oil return holes 4 are arranged on the inner wall of the guide body 1 and are circular holes with a diameter of 2.5 mm. There are three of them and they are evenly distributed in a row.

[0036] The oil seal 5 has an outer wall which is fitted with the inner wall of the groove of the guide body 1;

[0037] A piston 6 is slidably disposed inside the working cylinder and connected to the lower part of the piston rod;

[0038] A bottom valve 7 is fixedly installed below the working cylinder and is located below the piston 6;

[0039] The second oil return hole 8 is set at 5mm directly below the floating valve groove 2, is a circular hole with a diameter of 2.5mm, and has 3 holes evenly distributed in a row;

[0040] An oil collecting space 9 is formed below the oil seal 5 and at the upper end of the first oil return hole 4 .

[0041] When the automobile shock absorber is working, the O-ring 3 in the suspension valve groove 2 on the upper part of the inner wall of the guide body 1 moves up and down due to the change of oil pressure, instantly blocking the oil overflow, realizing internal circulation to prevent oil leakage, when the oil pressure increases, the O-ring 3 moves upward to block the channel above the suspension valve groove 2, when the pressure decreases, the O-ring 3 moves downward to open the channel to allow the oil to flow back, and the three first oil return holes 4 with a diameter of 2.5 mm evenly distributed on the guide body 1 allow a small amount of oil to flow back to the inside of the shock absorber to maintain oil balance, the outer wall of the oil seal 5 fits with the inner wall of the groove of the guide body 1, the upper part of the side wall of the piston 6 fits with the inner wall of the oil seal 5, and the bottom valve 7 is fixed to the bottom surface of the inner wall of the guide body 1 and is located below the piston 6. They together constitute a multi-layer sealing structure to prevent oil leakage in all directions and ensure stable operation of the shock absorber.

[0042] See also Figures 1-3 In this embodiment, the depth of the floating valve groove 2 is 3 mm, the width is 3 mm, the outer diameter of the O-ring 3 is 2.65 mm, and the outer diameters of the floating valve groove 2 and the O-ring 3 are loosely matched to improve the uniformity of the sealing contact stress distribution.

[0043] See also Figures 1-3 In this embodiment, the first oil return hole 4 is located below the suspension valve groove 2, and the vertical distance from the suspension valve groove 2 is 10 mm. The 10 mm spacing forms a pressure gradient buffer zone, so that the oil return pressure difference is stabilized within the range of 0.2-0.5 MPa.

[0044] See also Figures 1-3 In this embodiment, the outer diameter of the guide body 1 is 37±0.05 mm, and the precise outer diameter matching makes the radial runout ≤0.03 mm, so that the sealing reliability under vibration conditions is improved.

[0045] See also Figures 1-3 In this embodiment, the O-ring 3 and the oil seal 5 are made of high-density materials, which improves the stability of the product.

[0046] See also Figures 1-3 In this embodiment, the piston 6 is made of a high pressure-resistant sealing material, which improves the stability and service life of the product.

[0047] See also Figures 1-3 In this embodiment, the bottom valve 7 is made of high-strength, wear-resistant material, and its micro-motion wear resistance life is enhanced.

[0048] Working principle: Initial state: When the shock absorber is not working, the O-ring 3 in the groove 2 of the suspension valve naturally falls to the bottom, and the first oil return hole 4 remains unobstructed;

[0049] Normal driving (low pressure): the oil passes through the suspension valve groove 2, the oil collecting space 9, the first oil return hole 4, the extension valve of the piston 6, the inner wall of the guide body 1, and the suspension valve groove 2 in sequence to form an internal circulation, directly lubricating the inner wall of the guide body 1 without passing through the oil seal 5;

[0050] Continuous bumpy road surface (high-pressure circulation): When the oil pressure increases, the O-ring 3 is lifted up and pressed against the wall of the groove 2, blocking the oil leakage channel. At this time, the oil can only flow through the internal circulation. The oil passes through the suspension valve groove 2 and then flows back to the oil storage cylinder through the oil return hole 8 just below the suspension valve groove 2, forming a forced circulation, so that the oil completes the internal circulation without contacting the oil seal 5.

Claims

1. An automobile shock absorber oil leakage prevention component, characterized in that: include: The guide body (1) has a groove formed on the inner wall of the upper end thereof; A suspension valve groove (2) is formed on the upper portion of the inner wall of the guide body (1) and surrounds the inner wall of the guide body (1); An O-ring (3) is installed in the suspension valve groove (2). When the flow of oil produces a pressure change during the operation of the automobile shock absorber, the O-ring (3) moves up and down in the suspension valve groove (2); The first oil return holes (4) are arranged on the inner wall of the guide body (1), are circular holes with a diameter of 2.5 mm, are 3 in number and are evenly distributed in a row; An oil seal (5), the outer wall of which is arranged to fit the inner wall of the groove of the guide body (1); A piston (6), the piston (6) is slidably disposed inside the working cylinder and connected to the lower part of the piston rod; A bottom valve (7) is fixedly installed below the working cylinder and is located below the piston (6); The second oil return hole (8) is arranged at 5 mm directly below the floating valve groove (2), is a circular hole with a diameter of 2.5 mm, and is 3 in number and evenly distributed in a row; An oil collecting space (9) is formed below the oil seal (5) and at the upper end of the first oil return hole (4).

2. The automobile shock absorber oil leakage prevention component according to claim 1, characterized in that: The depth of the floating valve groove (2) is 3 mm, the width is 3 mm, the outer diameter of the O-ring (3) is 2.65 mm, and the outer diameters of the floating valve groove (2) and the O-ring (3) are loosely matched.

3. The automobile shock absorber oil leakage prevention component according to claim 1, characterized in that: The first oil return hole (4) is located below the floating valve groove (2), and the vertical distance between the first oil return hole (4) and the floating valve groove (2) is 10 mm.

4. The automobile shock absorber oil leakage prevention component according to claim 1, characterized in that: The outer diameter of the guide body (1) is 37±0.05 mm.

5. The automobile shock absorber oil leakage prevention component according to claim 1, characterized in that: The O-ring (3) and the oil seal (5) are made of high-density materials.

6. The automobile shock absorber oil leakage prevention component according to claim 1, characterized in that: The piston (6) is made of a high pressure-resistant sealing material.

7. The automobile shock absorber oil leakage prevention component according to claim 1, characterized in that: The bottom valve (7) is made of high-strength, wear-resistant material.

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