High-sealing-performance side-load-resistant shock absorber piston

Abstract

The utility model discloses a shock absorber piston with high sealing performance and side load resistance, the piston is arranged inside a shock absorber cylinder body, the piston comprises a piston body and a piston ring, the piston body comprises an upper piston and a lower piston, and one side of the piston ring is embedded inside the peripheral walls of the upper piston and the lower piston in a surrounding mode. The hydraulic cylinder is characterized in that an annular elastic piece is arranged between the joint of the upper piston and the lower piston and the piston ring, the inner side of the annular elastic piece is embedded into the joint of the upper piston and the lower piston, and the other side of the annular elastic piece is elastically connected with the piston ring so that the piston ring can be attached to the inner wall of the cylinder body. By arranging the annular elastic piece, tiny gaps between the joint of the upper piston and the lower piston and the piston ring and between the piston ring and the inner wall of the cylinder body are filled, tight contact is formed, the overall sealing performance of the piston assembly is improved, meanwhile, when lateral loads are borne, the annular elastic piece can absorb and disperse additional force, and the service life of the piston assembly is prolonged. Therefore, direct impact on the piston body is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of automotive shock absorbers, and particularly relates to a high-sealing anti-side load shock absorber piston. Background Art

[0002] A matching vehicle type of an automotive shock absorber piston has a relatively large weight, and has high requirements for off-road performance and anti-side load. At the same time, as a high-end vehicle type, it has certain requirements for comfort. There are two existing traditional shock absorber piston sealing schemes. Among them, Scheme One adopts a scheme of a piston plus a PTFE piston ring. The outer diameter of the piston is processed with a tooth-shaped groove, and the piston ring is embedded in the tooth-shaped groove. The thickness of the piston ring from the tooth surface of the piston to the outer diameter of the piston is generally only about 0.35 mm, which has good sealing performance and comfort, and has a cost advantage, but the anti-side load ability is weak, and the piston ring is easy to fall off when the side load is large; Scheme Two adopts a scheme of a piston plus a metal piston ring. The metal piston ring has the advantages of wear resistance and resistance to large side loads, but the metal piston ring will wear the matching steel pipe, and the friction force is greater than that of the piston ring made of PTFE material, the sealing performance is also inferior to that of the PTFE piston ring, and the cost is relatively high. Summary of the Invention

[0003] By providing a high-sealing anti-side load shock absorber piston in an embodiment of the present application, by arranging an annular elastic member, the tiny gaps between the connection of the upper piston and the lower piston and the piston ring, and between the piston ring and the inner wall of the cylinder body are effectively filled, forming a closer contact interface, thereby improving the overall sealing performance of the piston assembly. At the same time, when subjected to a lateral load, the annular elastic member can absorb and disperse these additional forces, thereby reducing the direct impact on the piston body.

[0004] To achieve the above object, the utility model provides the following technical solution: A high-sealing anti-side load shock absorber piston is arranged inside a shock absorber cylinder body. The piston includes a piston body and a piston ring. The piston body includes an upper piston and a lower piston. One side of the piston ring is circumferentially embedded inside the outer peripheral walls of the upper piston and the lower piston. An annular elastic member is arranged between the connection of the upper piston and the lower piston and the piston ring. The inner side of the annular elastic member is embedded inside the connection of the upper piston and the lower piston, and the outer side of the annular elastic member is elastically connected to the piston ring so that the piston ring is closely attached to the inner wall of the cylinder body.

[0005] Compared with the prior art, the advantages of the utility model are as follows:

[0006] The existence of the annular elastic member effectively fills the tiny gaps between the connection of the upper piston and the lower piston and the piston ring, and between the piston ring and the inner wall of the cylinder body, forming a closer contact interface. This close contact significantly improves the overall sealing performance of the piston assembly, reduces the risk of performance degradation or failure caused by gas or liquid leakage, and ensures the stable operation of the shock absorber under different working conditions;

[0007] When subjected to lateral loads, the annular elastic member can exert its good elasticity and toughness to absorb and disperse these additional forces, thereby reducing the direct impact on the piston body. This design not only enhances the structural strength of the piston assembly but also extends its service life, especially being more reliable in the face of complex and changeable operating environments;

[0008] As a buffer layer, the annular elastic member can reduce the direct contact and collision between metal components during the piston movement, thereby reducing the resulting noise and vibration. This is of great significance for improving the NVH (Noise, Vibration, Harshness) performance of the whole vehicle and providing a more comfortable riding experience for passengers.

[0009] As an improvement, an elastic member groove for accommodating the annular elastic member is provided circumferentially at the connection of the upper piston and the lower piston. The elastic member groove provides an accurate positioning and installation space for the annular elastic member, ensuring that the annular elastic member can be accurately embedded in the designed position. This precise positioning not only helps to maintain the overall structural stability of the piston assembly but also ensures that the annular elastic member will not affect its performance due to position deviation during operation; through the design of the elastic member groove, the annular elastic member can fit more closely between the connection of the upper piston and the lower piston and the piston ring, thereby further optimizing the sealing effect. This close fit reduces the leakage path of gas or liquid and improves the sealing performance of the shock absorber.

[0010] As an improvement, a piston ring groove for accommodating the piston ring is provided circumferentially on the outer peripheral walls of the upper piston and the lower piston. The piston ring groove is communicated with the elastic member groove. The piston ring groove provides an accurate positioning and installation space for the piston ring, ensuring that the piston ring can be accurately embedded in the designed position. This precise positioning not only helps to maintain the overall structural stability of the piston assembly but also ensures that the piston ring will not affect its performance due to position deviation during operation.

[0011] As an improvement, the piston ring is a polytetrafluoroethylene piston ring. The polytetrafluoroethylene piston ring can be continuously used in a very wide temperature range (-180°C to 260°C) and can withstand the impact of instant high temperatures. This characteristic makes it particularly suitable for working in high-temperature environments such as high-temperature compressors and engines. Under high-temperature conditions, the polytetrafluoroethylene piston ring can still maintain stable sealing performance and mechanical strength; the surface of the polytetrafluoroethylene piston ring is very smooth and has a very low friction coefficient, which enables it to reduce friction loss when contacting the inner wall of the cylinder, improve the operation efficiency of the equipment. At the same time, the low friction coefficient also means less wear and a longer service life.

[0012] As an improvement, the upper piston is provided with a plurality of first oil suction holes along the circumference of the center hole, and the lower piston is provided with a second oil suction hole staggered with the first oil suction hole in the radial direction. The first oil suction hole and the second oil suction hole are connected at the connection between the upper piston and the lower piston through a first buffer groove on both sides. The first oil suction hole, the second oil suction hole and the first buffer groove constitute an oil suction channel. The first oil suction hole and the second oil suction hole are staggered, and the first oil suction hole and the second oil suction hole are connected at the connection between the upper piston and the lower piston through the first buffer groove on both sides. Such a design significantly increases the area of ​​the oil suction channel. A larger oil suction area means that more oil can be quickly sucked into the upper cavity of the cylinder from the lower cavity of the cylinder, thereby improving the working efficiency of the shock absorber. The shock absorber is suitable for vehicles with heavy weight and high requirements for passability and comfort, such as medium and large off-road vehicles and pickup trucks.

[0013] As an improvement, the distance between the side walls of the first oil suction hole is smaller than the distance between the side walls of the second oil suction hole. The flow direction of the oil entering the oil suction channel is from the second oil suction hole through the first buffer grooves on both sides and then into the first oil suction hole. The distance between the side walls of the second oil suction holes is larger, which facilitates the oil to enter the oil suction channel faster, thereby increasing the oil suction efficiency and making it more stable and reliable when subjected to high pressure and high-speed movement.

[0014] As an improvement, the upper piston is provided with a plurality of first oil unloading holes along the circumference of the center hole, and the lower piston is provided with a second oil unloading hole staggered with the first oil unloading hole in the radial direction. Both sides of the first oil unloading hole and the second oil unloading hole are connected through a second buffer groove at the connection between the upper piston and the lower piston. The first oil unloading hole, the second oil unloading hole and the second buffer groove constitute an oil unloading channel. The oil unloading channel and the oil suction channel are staggered along the circumference. The first oil unloading hole and the second oil unloading hole are staggered, and both sides of the first oil unloading hole and the second oil unloading hole are connected through the second buffer groove at the connection between the upper piston and the lower piston. Such a design significantly increases the area of ​​the oil unloading channel. A larger oil unloading area means that more oil can quickly flow from the upper cavity of the cylinder into the lower cavity of the cylinder, thereby improving the rebound efficiency of the shock absorber.

[0015] As an improvement, the distance between the side walls of the first oil unloading hole is greater than the distance between the side walls of the second oil unloading hole. The flow direction of the oil entering the oil unloading channel is from the first oil unloading hole through the second buffer grooves on both sides and then into the second oil unloading hole. The larger distance between the side walls of the first oil unloading hole means that the flow cross-sectional area of ​​the fluid is increased when entering the oil unloading channel, which reduces the resistance to fluid flow and allows the oil to enter more smoothly.

[0016] As an improvement, a positioning boss is provided at the lower end of the upper piston, and a positioning groove is correspondingly provided at the upper end of the lower piston for the boss. The matching design of the positioning boss and the positioning groove can ensure the accurate position of the upper piston and the lower piston during installation, avoiding performance degradation or failures caused by position deviation; through simple docking installation, the tight connection between the upper piston and the lower piston can be achieved without complex adjustment and calibration work, improving the installation efficiency. Brief Description of the Drawings

[0017] The present utility model will be further described in detail below in conjunction with the drawings and specific embodiments:

[0018] Figure 1 Schematic cross-sectional view of a piston structure of a high-sealing anti-side load shock absorber Figure 1 ;

[0019] Figure 2 Schematic cross-sectional view of a piston structure of a high-sealing anti-side load shock absorber Figure 2 ;

[0020] Figure 3 Top view schematic diagram of the upper piston structure;

[0021] Figure 4 Bottom view schematic diagram of the lower piston structure.

[0022] The marks in the above figures are respectively: 1, piston ring; 2, upper piston; 2.1, positioning boss; 3, lower piston; 3.1, positioning groove; 4, annular elastic member; 5, elastic member groove; 6, piston ring groove; 7, oil suction channel; 7.1, first oil suction hole; 7.2, second oil suction hole; 7.3, first buffer groove; 8, oil discharge channel; 8.1, first oil discharge hole; 8.2, second oil discharge hole; 8.3, second buffer groove. Specific Embodiments

[0023] In the present utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "plane direction", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0024] Such as Figures 1 to 4As shown in the figure, a piston of a high-sealing anti-side load shock absorber is arranged inside the shock absorber cylinder block. The piston includes a piston body and a piston ring 1. The piston body includes an upper piston 2 and a lower piston 3. One side of the piston ring 1 is circumferentially embedded inside the outer peripheral walls of the upper piston 2 and the lower piston 3. A ring-shaped elastic member 4 is arranged between the connection of the upper piston 2 and the lower piston 3 and the piston ring 1. The inner side of the ring-shaped elastic member 4 is embedded inside the connection of the upper piston 2 and the lower piston 3, and the outer side of the ring-shaped elastic member 4 is elastically connected to the piston ring 1, so that the piston ring 1 is in close contact with the inner wall of the cylinder block.

[0025] A resilient member groove 5 for accommodating the ring-shaped elastic member 4 is arranged circumferentially at the connection of the upper piston 2 and the lower piston 3.

[0026] A piston ring groove 6 for accommodating the piston ring 1 is arranged circumferentially on the outer peripheral walls of the upper piston 2 and the lower piston 3, and the piston ring groove 6 is communicated with the resilient member groove 5.

[0027] Preferably, the piston ring 1 is a polytetrafluoroethylene piston ring.

[0028] A number of first oil suction holes 7.1 are arranged circumferentially along the central hole of the upper piston 2. The lower piston 3 is arranged with a second oil suction hole 7.2 offset in the radial direction from the first oil suction hole 7.1. The two sides of the first oil suction hole 7.1 and the second oil suction hole 7.2 are communicated through a first buffer groove 7.3 at the connection of the upper piston 2 and the lower piston 3. The first oil suction hole 7.1, the second oil suction hole 7.2 and the first buffer groove 7.3 form an oil suction channel 7. The distance between the side walls of the second oil suction hole 7.2 is greater than the distance between the side walls of the first oil suction hole 7.1.

[0029] A number of first oil discharge holes 8.1 are arranged circumferentially along the central hole of the upper piston 2. The lower piston 3 is arranged with a second oil discharge hole 8.2 offset in the radial direction from the first oil discharge hole 8.1. The two sides of the first oil discharge hole 8.1 and the second oil discharge hole 8.2 are communicated through a second buffer groove 8.3 at the connection of the upper piston 2 and the lower piston 3. The first oil discharge hole 8.1, the second oil discharge hole 8.2 and the second buffer groove 8.3 form an oil discharge channel 8, and the oil discharge channel 8 and the oil suction channel 7 are arranged circumferentially in a staggered manner.

[0030] The distance between the side walls of the first oil discharge hole 8.1 is greater than the distance between the side walls of the second oil discharge hole 8.2.

[0031] A positioning boss 2.1 is arranged at the lower end of the upper piston 2, and a positioning groove 3.1 corresponding to the boss is arranged at the upper end of the lower piston 3.

[0032] The inner side of the annular elastic member 4 is embedded inside the elastic member groove, and then the inner side of the piston ring is embedded inside the piston ring groove 6, so that the outer side of the annular elastic member 4 is elastically connected to the piston ring 1. The piston is arranged inside the shock absorber cylinder block, so that the outer side of the piston ring 1 is in close contact with the inner wall of the cylinder block.

[0033] When the piston is in the compression process, the piston rod drives the piston body so that the piston ring 1 slides downward relative to the inner wall of the cylinder block. The flow direction of the oil entering the oil absorption channel 7 is from the second oil absorption hole 7.2, flowing through the first buffer grooves 7.3 on both sides and then entering the first oil absorption hole 7.1. The oil is quickly sucked from the lower cavity of the cylinder block into the upper cavity of the cylinder block. When the piston is in the rebound process, the piston rod drives the piston body so that the piston ring 1 slides upward relative to the inner wall of the cylinder block. The flow direction of the oil entering the oil discharge channel 8 is from the first oil discharge hole 8.1, flowing through the second buffer grooves 8.3 on both sides and then entering the second oil discharge hole 8.2. The oil is quickly flowed from the upper cavity of the cylinder block into the lower cavity of the cylinder block.

[0034] The above has made an exemplary description of the present invention in combination with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above methods. As long as various non-substantive improvements are made by adopting the technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A high-sealing and anti-side-load shock absorber piston, which is arranged inside a shock absorber cylinder block. The piston comprises a piston body and a piston ring (1). The piston body includes an upper piston (2) and a lower piston (3). One side of the piston ring (1) is circumferentially embedded inside the outer peripheral walls of the upper piston (2) and the lower piston (3). It is characterized in that: A ring-shaped elastic member (4) is provided between the connection of the upper piston (2) and the lower piston (3) and the piston ring (1). The inner side of the ring-shaped elastic member (4) is embedded inside the connection of the upper piston (2) and the lower piston (3), and the outer side of the ring-shaped elastic member (4) is elastically connected to the piston ring (1) so that the piston ring (1) fits tightly against the inner wall of the cylinder block.

2. The high-sealing anti-side load shock absorber piston according to claim 1, characterized in that: An elastic member groove (5) for accommodating the ring-shaped elastic member (4) is provided circumferentially at the connection of the upper piston (2) and the lower piston (3).

3. The high-sealing anti-side load shock absorber piston according to claim 2, wherein: A piston ring groove (6) for accommodating the piston ring (1) is provided circumferentially on the outer peripheral walls of the upper piston (2) and the lower piston (3), and the piston ring groove (6) is communicated with the elastic member groove (5).

4. A high-sealing anti-side load shock absorber piston according to claim 1, characterized in that: The piston ring (1) is a polytetrafluoroethylene piston ring.

5. A high-sealing anti-side load shock absorber piston according to claim 1, characterized in that: A plurality of first oil suction holes (7.1) are provided circumferentially along the central hole of the upper piston (2). The lower piston (3) is provided with second oil suction holes (7.2) offset in the radial direction from the first oil suction holes (7.1). The two sides of the first oil suction holes (7.1) and the second oil suction holes (7.2) are communicated through a first buffer groove (7.3) at the connection of the upper piston (2) and the lower piston (3). The first oil suction holes (7.1), the second oil suction holes (7.2) and the first buffer groove (7.3) constitute an oil suction channel (7).

6. A high-sealing anti-side load shock absorber piston according to claim 5, characterized in that: The distance between the side walls of the second oil suction holes (7.2) is greater than the distance between the side walls of the first oil suction holes (7.1).

7. A high-sealing anti-side load shock absorber piston according to claim 5, characterized in that: A plurality of first oil discharge holes (8.1) are provided circumferentially along the central hole of the upper piston (2). The lower piston (3) is provided with second oil discharge holes (8.2) offset in the radial direction from the first oil discharge holes (8.1). The two sides of the first oil discharge holes (8.1) and the second oil discharge holes (8.2) are communicated through a second buffer groove (8.3) at the connection of the upper piston (2) and the lower piston (3). The first oil discharge holes (8.1), the second oil discharge holes (8.2) and the second buffer groove (8.3) constitute an oil discharge channel (8), and the oil discharge channel (8) and the oil suction channel (7) are arranged circumferentially in a staggered manner.

8. A high-sealing anti-side load shock absorber piston according to claim 7, characterized in that: The distance between the side walls of the first oil discharge holes (8.1) is greater than the distance between the side walls of the second oil discharge holes (8.2).

9. A high-sealing anti-side load shock absorber piston according to claim 1, characterized in that: A positioning boss (2.1) is provided at the lower end of the upper piston (2), and a positioning groove (3.1) corresponding to the boss is provided at the upper end of the lower piston (3).

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