Piston structure of a motor vehicle shock absorber

Abstract

The utility model discloses a piston structure of automobile shock absorber, including piston cylinder, piston rod and oil seal spare, and one end of piston rod is located in the piston cylinder and is equipped with the piston, and the annular lateral wall of piston cylinder is close to upper end and is fixedly connected with first fixed sheet, and the annular lateral wall of piston rod is close to lower extreme and is fixedly connected with second fixed sheet, and first fixed sheet and second fixed sheet are fixedly connected with the same shock absorber spring between them. The utility model provides the limiting of several rolling slide pearls on annular fixed block to piston rod, makes it can along piston cylinder move stably, and is sealed and fixed to oil seal spare by annular sealing block and annular connecting block, prevents the friction gap of piston rod and piston cylinder contact part, improves the buffering effect and prevents the oil from appearing from the friction gap, and the oil filling hole is arranged from inside to outside gradually decreasing through the inner diameter, and the arc flow limiting sheet and sealing plug of polyurethane rubber product cooperate and provide sealing to the oil filling hole, prevent the leakage caused by oil flow under pressure.

Description

Technical Field

[0001] This utility model relates to the field of automotive shock absorber technology, and in particular to a piston structure for an automotive shock absorber. Background Technology

[0002] The shock absorber is an important vibration damping component in the car suspension system. It is mainly composed of components such as pistons and springs. The piston of the shock absorber is its core working component. The piston consists of piston rod, piston cylinder and seals, and is installed in the shock absorber cylinder. The piston rod and piston cylinder work together to realize the reciprocating motion of oil, thereby absorbing road vibrations.

[0003] In actual use, the pistons of existing automotive shock absorbers have friction gaps at the contact points between the piston rod and the cylinder block. This not only affects the cushioning effect but also causes oil to leak out from the friction gaps. Furthermore, the oil filling holes in the cylinder wall lack a sealing structure, making it prone to leakage when the oil flows under pressure. This paper proposes a piston structure for automotive shock absorbers to solve the above problems. Utility Model Content

[0004] To address the shortcomings and defects in existing technologies, this utility model proposes a piston structure for an automotive shock absorber. This structure solves the technical problems in existing automotive shock absorber pistons where friction gaps exist at the contact points between the piston rod and the cylinder during actual use. These gaps not only affect the cushioning effect but also cause oil to leak out. Furthermore, the cylinder wall lacks a sealing structure in its oil filling holes, making it prone to leakage when the oil flows under pressure.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A piston structure for an automotive shock absorber includes a piston cylinder, a piston rod, and an oil seal. A piston is located at one end of the piston rod inside the piston cylinder. A first fixing plate is fixedly connected to the annular sidewall near the upper end of the piston cylinder, and a second fixing plate is fixedly connected to the annular sidewall near the lower end of the piston rod. A damping spring is fixedly connected between the first and second fixing plates and is sleeved onto the piston cylinder. The upper end of the oil seal has a guide assembly for the piston rod, and the lower end of the oil seal has a sealing assembly. The sealing assembly is fixedly connected to the lower end of the piston cylinder. An oil filling hole is provided on the annular inner wall near the top surface of the piston cylinder.

[0006] Preferably, the guide assembly includes an annular fixing block fixedly connected to the upper end of the oil seal. A plurality of rolling beads are embedded in the annular inner wall of the annular fixing block. The plurality of rolling beads are arranged in a circular pattern with equal spacing. The plurality of rolling beads roll and abut against the annular side wall of the piston rod.

[0007] Preferably, the sealing assembly includes an annular sealing block fixedly connected to the lower end of the oil seal, an annular connecting block fixedly connected to the lower end of the annular sealing block, an annular slot provided at the lower end of the piston cylinder, the annular connecting block inserted into the annular slot, four circular grooves provided at the lower end of the annular connecting block away from the center, and locking bolts passing through each of the four circular grooves, and the four locking bolts being threadedly connected to the lower end of the piston cylinder.

[0008] Preferably, the oil seal, the annular fixing block, and the annular sealing block are all made of fluororubber, and the rolling ball and the annular connecting block are all made of corrosion-resistant alloy.

[0009] Preferably, two symmetrically distributed arc-shaped flow limiting plates are fixedly connected to the annular inner wall of the oil filling hole. Both arc-shaped flow limiting plates have circular holes facing the annular sidewall of the oil filling hole. A sealing plug is inserted through the circular hole and the sealing plug is in sealing contact with the oil filling hole.

[0010] Preferably, the inner diameter of the oil filling hole decreases from the inside to the outside, and the arc-shaped flow restrictor and the sealing plug are both polyurethane rubber products.

[0011] Compared with the prior art, the advantages of this utility model are as follows: 1. The piston rod is limited by several rolling balls on the annular fixed block, so that it can move smoothly along the piston cylinder. The oil seal is sealed and fixed by the annular sealing block and the annular connecting block to prevent friction gaps at the contact point between the piston rod and the piston cylinder, thereby improving the buffering effect and preventing oil from leaking out from the friction gaps.

[0012] 2. The oil filling holes are arranged with decreasing inner diameter from the inside to the outside, and the arc-shaped flow restrictor and sealing plug of polyurethane rubber products provide a seal for the oil filling holes to prevent oil leakage caused by pressure flow. Attached Figure Description

[0013] Figure 1 This is a perspective view of the piston structure of an automotive shock absorber according to the present invention. Figure 2 for Figure 1 A magnified view of a section at point A in the middle; Figure 3 This is a schematic diagram of the oil seal, guide assembly, and sealing assembly of the piston structure of an automotive shock absorber proposed in this utility model. Figure 4 for Figure 1 A magnified view of a section at point B in the middle; Figure 5 This is a schematic diagram of the arc-shaped flow-limiting plate and sealing plug of the piston structure of an automobile shock absorber proposed in this utility model.

[0014] In the diagram: 1 Piston cylinder, 2 Piston rod, 3 Oil seal, 4 Piston, 5 First fixing plate, 6 Second fixing plate, 7 Shock absorber spring, 8 Oil filling hole, 9 Annular fixing block, 10 Rolling ball, 11 Annular sealing block, 12 Annular connecting block, 13 Annular slot, 14 Circular groove, 15 Locking bolt, 16 Arc-shaped flow restrictor, 17 Circular hole, 18 Sealing plug. Detailed Implementation

[0015] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0017] Reference Figure 1-5 A piston structure for an automotive shock absorber includes a piston cylinder 1, a piston rod 2, and an oil seal 3. A piston 4 is located at one end of the piston rod 2 inside the piston cylinder 1. A first fixing plate 5 is fixedly connected to the annular sidewall near the upper end of the piston cylinder 1, and a second fixing plate 6 is fixedly connected to the annular sidewall near the lower end of the piston rod 2. A shock-absorbing spring 7 is fixedly connected between the first fixing plate 5 and the second fixing plate 6, and the shock-absorbing spring 7 is sleeved on the piston cylinder 1. A guide assembly for the piston rod 2 is provided at the upper end of the oil seal 3. The guide assembly includes an annular fixing block 9 fixedly connected to the upper end of the oil seal 3. A plurality of rolling balls 10 are embedded in the annular inner wall of the annular fixing block 9. The rolling balls 10 are evenly spaced and arranged in a circular pattern. Each rolling ball 10 rolls and abuts against the annular sidewall of the piston rod 2. The rolling balls 10 in the annular fixing block 9 provide a limiting position for the piston rod 2, allowing it to move smoothly along the piston cylinder 1.

[0018] The lower end of the oil seal 3 is provided with a sealing assembly, which is connected and fixed to the lower end of the piston cylinder 1. The sealing assembly includes an annular sealing block 11 fixedly connected to the lower end of the oil seal 3. An annular connecting block 12 is fixedly connected to the lower end of the annular sealing block 11. The lower end of the piston cylinder 1 is provided with an annular slot 13, and the annular connecting block 12 is inserted into the annular slot 13. The lower end of the annular connecting block 12 away from the center is provided with four circular grooves 14. Each of the four circular grooves 14 is provided with a locking bolt 15, and all four locking bolts 15 are threadedly connected to the lower end of the piston cylinder 1. Both the annular fixing block 9 and the annular sealing block 11 are made of fluororubber, while the rolling ball 10 and the annular connecting block 12 are made of corrosion-resistant alloy. The annular fixing block 9, the oil seal 3, and the annular sealing block 11 are inserted into the piston cylinder 1, so that the annular connecting block 12 on the annular sealing block 11 is inserted into the annular slot 13 at the lower end of the piston cylinder 1. Four locking bolts 15 are respectively installed through the four circular slots 14 and screwed into the piston cylinder 1 to prevent friction gaps at the contact points between the piston rod 2 and the piston cylinder 1, thereby improving the buffering effect and preventing oil from leaking out from the friction gaps.

[0019] The piston cylinder 1 has an oil filling hole 8 on its annular inner wall near the top surface. Two symmetrically distributed arc-shaped flow restrictors 16 are fixedly connected to the annular inner wall of the oil filling hole 8. Both arc-shaped flow restrictors 16 have circular holes 17 on their annular sidewalls facing the oil filling hole 8. A sealing plug 18 is inserted through the circular hole 17 and makes sealing contact with the oil filling hole 8. The inner diameter of the oil filling hole 8 decreases from the inside to the outside. Both the arc-shaped flow restrictors 16 and the sealing plug 18 are polyurethane rubber products. The oil filling hole 8, with its inner diameter decreasing from the inside to the outside, together with the arc-shaped flow restrictors 16 and the sealing plug 18 made of polyurethane rubber, provides a seal for the oil filling hole 8, preventing oil leakage due to pressure flow.

[0020] In use, the annular fixing block 9, oil seal 3, and annular sealing block 11 are inserted into the piston cylinder 1, so that the annular connecting block 12 on the annular sealing block 11 is inserted into the annular slot 13 at the lower end of the piston cylinder 1. Four locking bolts 15 are respectively inserted through the four circular slots 14 and screwed into the piston cylinder 1. This allows the rolling ball bearings 10 in the annular fixing block 9 to limit the piston rod 2, enabling it to move smoothly along the piston cylinder 1. The annular sealing block 11 and annular connecting block 12 seal and fix the oil seal 3, preventing friction gaps at the contact point between the piston rod 2 and the piston cylinder 1. This improves the buffering effect and prevents oil from leaking out of the friction gaps. The oil filling holes 8, with their inner diameter decreasing from the inside to the outside, are sealed by the arc-shaped flow restrictor 16 and sealing plug 18 made of polyurethane rubber, preventing oil leakage due to pressure flow.

[0021] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A piston structure for an automobile shock absorber, comprising a piston cylinder (1), a piston rod (2), and an oil seal (3), wherein a piston (4) is provided at one end of the piston rod (2) inside the piston cylinder (1), a first fixing plate (5) is fixedly connected to the annular side wall near the upper end of the piston cylinder (1), and a second fixing plate (6) is fixedly connected to the annular side wall near the lower end of the piston rod (2), wherein the same shock-absorbing spring (7) is fixedly connected between the first fixing plate (5) and the second fixing plate (6), and the shock-absorbing spring (7) is sleeved on the piston cylinder (1), characterized in that, The upper end of the oil seal (3) is provided with a guide assembly for the piston rod (2), and the lower end of the oil seal (3) is provided with a sealing assembly. The sealing assembly is connected and fixed to the lower end of the piston cylinder (1). The piston cylinder (1) has an oil filling hole (8) on the annular inner wall near the top surface.

2. The piston structure of an automotive shock absorber according to claim 1, characterized in that, The guide assembly includes an annular fixing block (9) fixedly connected to the upper end of the oil seal (3). A plurality of rolling beads (10) are embedded in the annular inner wall of the annular fixing block (9). The plurality of rolling beads (10) are arranged in a circular arrangement with equal spacing. The plurality of rolling beads (10) roll and abut against the annular side wall of the piston rod (2).

3. The piston structure of an automotive shock absorber according to claim 2, characterized in that, The sealing assembly includes an annular sealing block (11) fixedly connected to the lower end of the oil seal (3). An annular connecting block (12) is fixedly connected to the lower end of the annular sealing block (11). An annular slot (13) is provided at the lower end of the piston cylinder (1). The annular connecting block (12) is inserted into the annular slot (13). Four circular grooves (14) are provided at the lower end of the annular connecting block (12) away from the center. Locking bolts (15) are provided through each of the four circular grooves (14). All four locking bolts (15) are threadedly connected to the lower end of the piston cylinder (1).

4. The piston structure of an automotive shock absorber according to claim 3, characterized in that, The oil seal (3), the annular fixing block (9) and the annular sealing block (11) are all fluororubber products, and the rolling ball (10) and the annular connecting block (12) are all corrosion-resistant alloy products.

5. The piston structure of an automotive shock absorber according to claim 1, characterized in that, Two symmetrically distributed arc-shaped flow restrictors (16) are fixedly connected to the annular inner wall of the oil filling hole (8). Both arc-shaped flow restrictors (16) have circular holes (17) on the annular sidewall of the oil filling hole (8). A sealing plug (18) is inserted through the circular hole (17) and the sealing plug (18) is in sealing contact with the oil filling hole (8).

6. The piston structure of an automotive shock absorber according to claim 5, characterized in that, The inner diameter of the oil filling hole (8) decreases from the inside to the outside, and the arc-shaped flow restrictor (16) and the sealing plug (18) are both polyurethane rubber products.

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