Automobile shock absorber with nonlinear rigidity recovery buffer block

Abstract

The utility model relates to the technical field of automobile shock absorbers, in particular to an automobile shock absorber with a nonlinear rigidity recovery buffer block. A circumferential installation groove is formed in one side in the shock absorber cylinder barrel, a supporting ring is installed, a recovery buffer block is installed on the side, close to the guider, of the supporting ring, a through hole is formed in the middle of the recovery buffer block, the upper end face and the lower end face of the recovery buffer block are of corrugated structures, the upper ends and the lower ends of the corrugated structures are the same in shape, and the highest point of the upper side and the highest point of the lower side are consistent in position. The axial section of the recovery buffer block is of a drum-shaped structure formed by combining an upper conical surface and a lower conical surface, the end faces of the two ends of the drum-shaped structure are small, and the end face of the middle of the drum-shaped structure is large. Compared with the prior art, the durability of the shock absorber recovery buffer block is improved, the service life of the part is prolonged, the axial deformation rigidity curve can be well adjusted, and the shock absorber is smoother in the stretching process.

Description

Technical Field

[0001] This utility model relates to the field of automotive shock absorber technology, specifically an automotive shock absorber with a nonlinear stiffness recovery buffer block. Background Technology

[0002] Traditional automotive shock absorber rebound blocks are circular washer-shaped, playing a crucial role during shock absorber operation. Specifically, when the shock absorber is under tension and the piston rod extends, the rebound block contacts the lower end of the top guide of the shock absorber, undergoing compression and deformation. However, with continuous vehicle operation, this frequent impact and compression causes the rebound block to gradually wear down and even deform, ultimately leading to its functional failure. Utility Model Content

[0003] To address the problems mentioned in the background art, this utility model provides an automotive shock absorber with a nonlinear stiffness restoring buffer block, comprising a shock absorber cylinder, a piston rod, a guide, a support ring, and a restoring buffer block. The shock absorber cylinder has a guide on its inner side at one end, and the piston rod passes through the guide, such that part of the piston rod is located inside the shock absorber cylinder and part is located outside the shock absorber cylinder. A circumferential mounting groove is formed on one side of the piston rod inside the shock absorber cylinder, and a support ring is mounted thereon. A restoring buffer block is mounted on the side of the support ring near the guide. The restoring buffer block has a through hole in the middle, and the upper and lower end faces of the restoring buffer block are corrugated structures. The upper and lower ends of the corrugated structure have the same shape, with the highest point on the upper side and the highest point on the lower side at the same position, and the lowest point on the upper side and the lowest point on the lower side at the same position. The axial cross-section of the restoring buffer block is a drum-shaped structure formed by the combination of two conical surfaces, with the two end faces being small and the middle end face being large.

[0004] A gap is provided between the shock absorber cylinder and the support ring.

[0005] The piston rod and the recovery buffer block are interference fit, meaning that the diameter of the through hole in the recovery buffer block is less than or equal to the outer diameter of the piston rod.

[0006] The support ring is a metal stamping part.

[0007] The material of the recovery buffer block is nitrile rubber.

[0008] Compared with the prior art, this invention achieves a line contact rather than a surface contact when the shock absorber's recovery buffer block and the lower end of the guide make contact. The gaps in the wavy surface allow the shock absorber oil to flow, forming a primary hydraulic buffer, which improves the durability of the shock absorber's recovery buffer block and extends the life of the component. Furthermore, the drum-shaped structure of the recovery buffer block, with its small end faces and large middle end face, allows for excellent adjustment of the axial deformation stiffness curve during compression, resulting in a smoother shock absorber tension process. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of this utility model;

[0010] Figure 2 This is a perspective view of the recovery buffer block in this utility model;

[0011] Figure 3 This is a side view of the recovery buffer block in this utility model;

[0012] Figure 4 This is a cross-sectional view of the recovery buffer block in this utility model;

[0013] Figure 5 This is a top view of the recovery buffer block in this utility model;

[0014] Figure 6 This is a stiffness curve diagram of the recovery buffer block in this utility model;

[0015] See Figures 1 to 4 1. Shock absorber cylinder, 2. Piston rod, 3. Guide, 4. Support ring, 5. Restoring buffer block, 6. Corrugated structure, 7. Drum-shaped structure. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] like Figure 1A type of automotive shock absorber with a nonlinear stiffness restoring buffer block includes a shock absorber cylinder 1, a piston rod 2, a guide 3, a support ring 4, and a restoring buffer block 5. The guide 3 is located on the inner side of one end of the shock absorber cylinder 1. The piston rod 2 passes through the guide 3, such that part of the piston rod 2 is located inside the shock absorber cylinder 1, and part is located outside the shock absorber cylinder 1. A circumferential mounting groove is formed on one side of the piston rod 2 inside the shock absorber cylinder 1, and the support ring 4 is mounted thereon. The restoring buffer block 5 is mounted on the side of the support ring 4 near the guide 3. The restoring buffer block 5 has a through hole in the middle. The upper and lower end faces are corrugated structures 6. The shapes of the upper and lower ends of the corrugated structure 6 are the same, with the highest and lowest points on the upper and lower sides being at the same positions and having the same thickness. In the free state, the corrugated gaps between the restoring buffer block 5, the support ring 4, and the guide 3 contain damping oil. The axial section of the restoring buffer block 5 is a drum-shaped structure 7 composed of two conical surfaces. The drum-shaped structure 7 has small end faces at both ends and a large end face in the middle, which allows it to effectively adjust the axial deformation stiffness curve during compression, making the shock absorber stretch more smoothly. As can be seen from the stiffness curve of the restoring buffer block, due to the design of the drum-shaped structure, the deformation of the restoring buffer block 5 slows down in the range of 3~6.5KN when the piston rod 2 is subjected to tension, no longer showing a linear change. This force range corresponds to the working condition of the shock absorber when the vehicle goes over a large pothole. At this time, the deformation of the restoring buffer block 5 is small, which can improve the passenger's ride comfort.

[0018] A gap is provided between the shock absorber cylinder 1 and the support ring 4, allowing the damping oil to flow through the gap.

[0019] The piston rod 2 and the recovery buffer block 5 are interference fit, that is, the diameter of the through hole of the recovery buffer block 5 is less than or equal to the outer diameter of the piston rod, which can fix the recovery buffer block 5 in the position of the piston rod 2.

[0020] The support ring 4 is a metal stamping part. The support ring 4 is a thin part that is nested on the outside of the piston rod 2 to limit the position of the recovery buffer block 5.

[0021] The material of the recovery buffer block 5 is nitrile rubber. Nitrile rubber has the characteristics of good oil resistance and high wear resistance, and is suitable for working conditions in shock absorbers containing damping oil and requiring contact friction.

[0022] In use, the restoring buffer block 5 is fitted onto the outside of the piston rod 2 and limited by the support ring 4. When the damper is stretched, the piston rod 2 moves outward. When stretched to its limit position, the restoring buffer block 5 will contact and compress with the guide 3 at the front end of the damper cylinder 1. Because the upper and lower end faces of the restoring buffer block 5 are corrugated, when the restoring buffer block 5 and the guide 3 first come into contact, it is not a surface contact but a line contact. The gaps in the corrugated structure allow the damper oil to flow, forming a primary hydraulic buffer. The damping oil can flow out from the corrugated structure of the restoring buffer block 5 through the gap between the support ring 4 and the damper cylinder 1. This improves the durability of the damper's restoring buffer block 5 and extends the life of this component.

Claims

1. A shock absorber for a vehicle with a non-linear stiffness restoring bump, comprising a shock absorber cylinder (1), a piston rod (2), a guide (3), a support ring (4), a restoring bump (5), characterized in that: The inner side of one end of the shock absorber cylinder (1) is provided with a guide (3), the piston rod (2) passes through the guide (3), so that a part of the piston rod (2) is arranged inside the shock absorber cylinder (1) and a part is arranged outside the shock absorber cylinder (1), a circumferential mounting groove is formed on one side of the piston rod (2) in the shock absorber cylinder (1) and a support ring (4) is mounted, the support ring (4) is provided with a recovery buffer block (5) near one side of the guide (3), the recovery buffer block (5) is provided with a through hole in the middle, the upper and lower end faces of the recovery buffer block (5) are corrugated structures (6), the shapes of the upper and lower ends of the corrugated structures (6) are the same, the positions of the uppermost points of the upper and lower ends are consistent, the positions of the lowermost points of the upper and lower ends are consistent, the axial section of the recovery buffer block (5) is a drum-shaped structure (7) combined by two tapered surfaces, the end faces of the drum-shaped structure (7) are small at both ends and large in the middle.

2. A shock absorber for a vehicle having a non-linear stiffness restoring bump according to claim 1, characterized in that: The gap is arranged between the shock absorber cylinder (1) and the support ring (4).

3. A shock absorber for a vehicle having a non-linear stiffness restoring bump according to claim 1, characterized in that: The piston rod (2) and the recovery buffer block (5) are in interference fit, that is, the diameter of the through hole of the recovery buffer block (5) is less than or equal to the outer diameter of the piston rod.

4. The automotive shock absorber with a non-linear stiffness restoring bump stop of claim 1, wherein: The support ring (4) is a metal stamping part.

5. The automotive shock absorber with a non-linear stiffness restoring bump stop of claim 1, wherein: The material of the recovery buffer block (5) is nitrile rubber.

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