Progressive shock absorber compression hydraulic buffer assembly and shock absorber using the assembly

Abstract

This invention discloses a progressive shock absorber compression hydraulic damping assembly, comprising a floating piston, a piston valve, and a spring. The piston valve includes a first boss and a second boss, with a throttling orifice on the second boss. The floating piston is an annular structure with a central channel, including a mounting portion, a connecting portion, and a flow portion. The flow portion has a short flow groove and a long flow groove. This progressive shock absorber compression hydraulic damping assembly, when applied to a shock absorber, provides hydraulic damping. Through the specific structure of the floating piston and piston valve, it achieves a graded throttling function, adapting to and adjusting the damping force, thereby significantly improving vehicle stability during driving. It is also easy to implement and helps control costs. Furthermore, this invention also provides a compression hydraulic damping shock absorber using this assembly.

Description

Technical Field

[0001] This invention relates to the field of automotive shock absorber technology, specifically to a progressive shock absorber compression hydraulic buffer assembly and a shock absorber using the assembly. Background Technology

[0002] During vehicle operation, the shock absorber, as a core component, plays a crucial role in absorbing road impact energy and suppressing vehicle body vibration. Its performance directly affects the vehicle's ride comfort and handling stability.

[0003] In the working stroke of a shock absorber, the buffering stage at the end of the compression stroke is particularly crucial. When a vehicle travels over bumpy roads, the shock absorber piston moves rapidly towards the bottom of the cylinder. Conventional shock absorbers use a spring on the underside of the piston to cushion the impact and prevent it from bottoming out under extreme conditions. However, the spring only provides cushioning; during the recovery stroke, the spring's compressive potential energy is converted back into kinetic energy, failing to eliminate vibration and causing continuous, large wheel bounces. To improve damping capacity, the conventional approach is to increase the piston valve's opening threshold, but this results in a stiffer shock absorber and reduced comfort. For a shock absorber, if the damping force gradually increases with the compression stroke, providing lower damping force at the beginning and higher damping force at the end, thus eliminating the severe vibrations caused by extreme conditions, it will undoubtedly gain market favor. In theory, electronically controlled shock absorbers can adjust the damping force by regulating the opening of the solenoid valve, thus achieving the aforementioned capabilities. However, electronically controlled shock absorbers are expensive and suitable for use in high-end vehicles, but they are not economical and are not conducive to cost control. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this application provides a progressive shock absorber compression hydraulic damping assembly. This progressive shock absorber compression hydraulic damping assembly, applied in a shock absorber, provides hydraulic damping and, through a specially structured floating piston and piston valve, achieves graded throttling, adaptively adjusting the damping force to significantly improve vehicle stability during driving. Furthermore, it is easy to implement and helps control costs. In addition, this application also provides a compression hydraulic damping shock absorber employing this assembly.

[0005] For the buffer component, the technical solution of this application is as follows:

[0006] A progressive shock absorber compression hydraulic buffer assembly includes a floating piston, a piston valve, and a spring disposed inside a working cylinder. The piston valve has compression damping valve plates and recovery damping valve plates arranged in groups on both sides of its valve seat. The outer contour of the piston valve seat has a stepped structure, sequentially including a first boss and a second boss. The second boss slides with the working cylinder and has a set of throttling orifices. The spring is located at the bottom of the working cylinder. The floating piston is located between the spring and the piston valve. The floating piston has an annular structure with a central channel, including a mounting part, a connecting part, and a flow part arranged in sequence. The mounting part abuts against the spring. Both the mounting part and the flow part slide with the working cylinder. The inner circumferential surface of the flow section is provided with a set of short flow grooves and a set of long flow grooves opened along the axial direction; the outer circumferential diameter of the first boss is adapted to the inner circumferential diameter of the flow section; during the compression stroke of the damper, when the outer circumferential surface of the first boss is in contact with the inner circumferential surface of the flow section and does not completely cover the short flow grooves, the oil in the lower chamber first passes through the short flow grooves and long flow grooves, and then through the throttling orifice, and enters the upper chamber; when the outer circumferential surface of the first boss completely covers the short flow grooves, the oil passes through the long flow grooves and the throttling orifice in sequence and enters the upper chamber; when the inner bottom surface of the flow section abuts against the lower end surface of the first boss, the oil in the lower chamber pushes open the compression damping valve plate on the piston valve and enters the upper chamber.

[0007] Compared with existing technologies, the progressive shock absorber compression hydraulic buffer assembly of this application, when applied to a shock absorber, can play a hydraulic buffering role and achieve a graded throttling function through the cooperation of a floating piston and a piston valve: ① In the initial buffering stage, the outer peripheral surface of the first boss on the piston valve is in contact with the inner peripheral surface of the flow section but does not completely cover the short flow groove. The oil in the lower chamber first passes through the short flow groove and the long flow groove, and then enters the upper chamber through the throttling orifice; ② In the enhanced buffering stage, the outer peripheral surface of the first boss on the piston valve completely covers the short flow groove. The oil in the lower chamber enters the upper chamber sequentially through the long flow groove and the throttling orifice; ③ In the powerful buffering stage, the inner bottom surface of the flow section abuts against the front end of the first boss. The oil in the lower chamber pushes the valve plate on the piston valve into the upper chamber. In this way, the damping force is gradually increased to cope with different degrees of road impact, and the damping force is adaptively adjusted, thereby significantly improving the vehicle body stability under driving conditions. Moreover, it does not require complex electronic control components, is easy to implement, and is conducive to cost control.

[0008] As an optimization, in the aforementioned progressive shock absorber compression hydraulic buffer assembly, a gap exists between the outer peripheral surface of the connecting part and the inner peripheral surface of the working cylinder, forming a cavity. This structure reduces the resistance between the floating piston and the inner wall of the working cylinder, facilitates assembly, and also helps reduce wear.

[0009] As an optimization, in the aforementioned progressive shock absorber compression hydraulic buffer assembly, both ends of the spring are fixedly connected to the bottom cover of the shock absorber and the mounting part of the floating piston, respectively. This structure provides stable guidance and reduces abnormal noise and wear. Furthermore, for ease of manufacturing, the bottom of the working cylinder is provided with a pressure plate detachably connected to the bottom cover, which fixes the lower end of the spring. Even further, the pressure plate is bolted to the bottom cover. This structure facilitates the installation, removal, and replacement of the pressure plate.

[0010] As an optimization, in the aforementioned progressive shock absorber compression hydraulic buffer assembly, the bottom end of the mounting part is provided with a spring mounting groove, and a notch baffle is provided on the spring mounting groove. The notch baffle is used to limit the upper end of the spring. With this structure, both ends of the spring are fixed, further stabilizing the guidance, reducing abnormal noise and wear.

[0011] As an optimization, in the aforementioned progressive shock absorber compression hydraulic buffer assembly, the spring mounting groove is provided with an arc-shaped boss, and the spring is provided with an arc-shaped groove. The arc-shaped boss and the arc-shaped groove form a locking structure for circumferentially limiting the floating piston. This structure prevents the floating piston from rotating and generating abnormal noise.

[0012] As an optimization, in the aforementioned progressive shock absorber compression hydraulic buffer assembly, the outer peripheral surface of the mounting part is provided with a first sealing groove, and the outer peripheral surface of the flow part is provided with a second sealing groove. Both the first and second sealing grooves are provided with sealing rings. This structure improves sealing performance and also serves to guide and center the components, reduce wear, and lower noise.

[0013] As an optimization, for ease of assembly, the sealing ring in the aforementioned progressive shock absorber compression hydraulic buffer assembly has an open structure.

[0014] Regarding the vibration damper, the technical solution of this application is as follows:

[0015] A compression hydraulic damper includes the aforementioned progressive damper compression hydraulic damping assembly, a working cylinder, and a gas-liquid combination cylinder communicating with the bottom of the working cylinder. The gas-liquid combination cylinder is equipped with a sliding oil-gas isolation piston, which divides the interior of the gas-liquid combination cylinder into a gas chamber and a liquid chamber. The liquid chamber is communicating with the bottom of the working cylinder.

[0016] Compared with the prior art, the compression hydraulic damper of this application can realize the function of graded throttling. During the compression stroke, by gradually reducing the flow area of ​​the oil, it adapts and adjusts the damping force, thereby significantly improving the vehicle body stability under driving conditions. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the structure of the progressive shock absorber compression hydraulic buffer assembly in this application;

[0018] Figure 2 yes Figure 1 The front view;

[0019] Figure 3 This is a cross-sectional view of the initial buffering stage in this application;

[0020] Figure 4 This is the cross section in the reinforced buffer phase of this application. Figure 1 ;

[0021] Figure 5 This is the cross section in the reinforced buffer phase of this application. Figure 2 ;

[0022] Figure 6 This is a cross-sectional view of the application in the strong buffering stage;

[0023] Figure 7 This is a schematic diagram of the floating piston structure in this application. Figure 1 ;

[0024] Figure 8 This is a schematic diagram of the floating piston structure in this application. Figure 2 ;

[0025] Figure 9 This is a schematic diagram of the spring structure in this application;

[0026] Figure 10 This is a schematic diagram of the sealing ring structure in this application;

[0027] Figure 11 This is a schematic diagram of the structure of the compression hydraulic buffer damper in this embodiment.

[0028] The labels in the attached diagram are as follows: 1-Floating piston, 11-Mounting part, 111-Spring mounting groove, 112-Notch baffle, 113-Arc-shaped boss, 114-First sealing groove, 12-Connecting part, 13-Flow part, 131-Short flow groove, 132-Long flow groove, 133-Second sealing groove, 134-Inner bottom surface, 14-Central channel; 2-Piston valve, 21-First boss, 211-Front end face, 22-Second boss, 221-Throttle orifice; 3-Spring, 31-Arc-shaped groove; 4-Piston rod; 5-Working cylinder; 6-Cavity; 7-Pressure plate; 8-Sealing ring; 9-Gas-liquid combination cylinder; 10-Bottom cover. Detailed Implementation

[0029] The present application will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present application. In the following embodiments, content not described in detail or shown in detail in the accompanying drawings is common knowledge in the art.

[0030] Example (see) Figures 1 to 11 ):

[0031] A compression hydraulic damper includes a progressive damper compression hydraulic damping assembly, a working cylinder 5, and a gas-liquid combination cylinder 9 connected to the bottom of the working cylinder 5. The gas-liquid combination cylinder 9 is provided with a sliding oil-gas isolation piston, which divides the interior of the gas-liquid combination cylinder 9 into a gas chamber and a liquid chamber. The liquid chamber is connected to the bottom (lower chamber) of the working cylinder 5.

[0032] In this embodiment, the progressive shock absorber compression hydraulic buffer assembly includes a floating piston 1, a piston valve 2, and a spring 3 disposed inside the working cylinder 5; the piston valve 2 has compression damping valve plates and recovery damping valve plates arranged in groups on both sides of its valve seat (similar to the prior art, the piston valve 2 divides the working cylinder 5 into an upper chamber and a lower chamber, and the valve seat has compression damping oil channels and recovery damping oil channels; the compression damping valve plates and compression damping oil channels are used together to form a compression valve, and the recovery damping valve plates and recovery damping oil channels are used together to form a recovery valve); the outer contour of the piston valve 2's valve seat has a stepped structure, sequentially including a first boss 21 and a second boss 22; the second boss 22 is in sliding engagement with the working cylinder 5. It is provided with a set of throttling orifices 221; the spring 3 is located at the bottom of the working cylinder 5; the floating piston 1 is located between the spring 3 and the piston valve 2; the floating piston 1 is an annular structure with a central channel 14, including a mounting part 11, a connecting part 12 and a flow part 13 arranged in sequence, the mounting part 11 abuts against the spring 3; the mounting part 11 and the flow part 13 are both slidably engaged with the working cylinder 5; the inner circumferential surface of the flow part 13 is provided with a set of short flow grooves 131 and a set of long flow grooves 132 opened along the axial direction; the outer circumferential diameter of the first boss 21 is adapted to the inner circumferential diameter of the flow part 13 (the first boss 21 can form a close fit with the flow part 13).

[0033] In this embodiment, a gap exists between the outer peripheral surface of the connecting part 12 and the inner peripheral surface of the working cylinder 5, forming a cavity 6. This structure reduces the resistance between the floating piston 1 and the inner wall of the working cylinder 5, which is beneficial for assembly and also helps to reduce wear.

[0034] In this embodiment, the bottom of the working cylinder 5 is provided with a pressure plate 7 that is detachably connected to the bottom cover 10, and the pressure plate 7 fixes the lower end of the spring 3. With this structure, one end of the spring 3 is fixed to the bottom of the working cylinder 4, which can guide the compression direction of the spring 3 and avoid skewing. After being fixed, the spring 3 will not move around randomly, reducing the risk of collision with surrounding parts, reducing wear, and also reducing noise generation.

[0035] In this embodiment, the pressure plate 7 and the bottom cover 10 are connected by bolts. This structure facilitates the installation, removal, and replacement of the pressure plate 7.

[0036] In this embodiment, the two ends of the spring 3 are fixedly connected to the bottom cover 10 of the shock absorber and the mounting part 11 of the floating piston 1, respectively. The bottom end of the mounting part 11 is provided with a spring mounting groove 111, and a notch baffle 112 is provided on the spring mounting groove 111. The notch baffle 112 is used to limit the upper end of the spring 3. With this structure, both ends of the spring 3 are fixed, which further stabilizes the guidance, reduces abnormal noise and wear. The spring 3 can be screwed into the spring mounting groove 111 and limited by the notch baffle 112, so that the spring 3 is reliably connected to the floating piston 1.

[0037] In this embodiment, the spring mounting groove 111 is provided with an arc-shaped boss 113, and the spring 3 is provided with an arc-shaped groove 31. The arc-shaped boss 113 and the arc-shaped groove 31 form a locking structure for circumferentially limiting the floating piston 1. This structure ensures the reliability of the connection between the spring 3 and the floating piston 1 and prevents the floating piston 1 from rotating and producing abnormal noise.

[0038] In this embodiment, the outer peripheral surface of the mounting part 11 is provided with a first sealing groove 114, and the outer peripheral surface of the flow part 13 is provided with a second sealing groove 133. Both the first sealing groove 114 and the second sealing groove 133 are provided with sealing rings 8. This structure improves sealing performance and also serves to guide and center the object, reduce wear, and lower noise.

[0039] In this embodiment, the sealing ring 8 has an open structure. This structure facilitates the installation, removal, and replacement of the sealing ring 8.

[0040] During the compression stroke of the shock absorber, a portion of the oil flows from the lower chamber into the liquid chamber of the gas-liquid combined cylinder 9, and a portion flows into the upper chamber of the working cylinder 5. The oil flowing into the upper chamber has different flow paths depending on the different buffering stages, including:

[0041] ①In the initial buffering stage, the outer peripheral surface of the first boss 21 of the piston valve 2 is in contact with the inner peripheral surface of the flow section 13 and does not completely cover the short flow groove 131. The oil flows from the lower cavity where the spring 3 is located through the central channel 14 into the short flow groove 131 and the long flow groove 132, and then through the throttling hole 221 to the upper cavity where the piston rod 4 is located.

[0042] ②In the enhanced buffering stage, the outer circumferential surface of the first boss 21 of the piston valve 2 completely covers the short flow groove 131. The oil flows from the lower chamber where the spring 3 is located, first through the central channel 14 into the long flow groove 132, and then through the throttle orifice 221 to the upper chamber where the piston rod 4 is located. (In the enhanced buffering stage, since the short flow groove 131 does not flow with oil, the oil flow area is smaller, and the damping force is greater than in the initial buffering stage.)

[0043] ③ During the strong buffering stage, the inner bottom surface 134 of the flow section 13 and the front end surface 211 of the first protrusion 21 abut against each other to form a sealing structure (at this time, the oil can no longer flow from the short flow groove 131 and the long flow groove 132). The oil in the lower chamber enters the piston valve 2 through the central channel 14, and then pushes open the compression damping valve plate on the piston valve 2 and flows into the upper chamber (during the strong buffering stage, the oil needs to push open the compression damping valve plate, and the damping force is the greatest, which is used to filter the large-amplitude vibration generated by the bumpy road surface).

[0044] The foregoing general description of the invention and its specific embodiments should not be construed as a limitation on the technical solution of the invention. Those skilled in the art, based on the disclosure of this application, can add, reduce, or combine the disclosed technical features in the foregoing general description and / or specific embodiments (including examples) without departing from the constituent elements of the invention, to form other technical solutions within the scope of protection of this application.

Claims

1. A progressive shock absorber compression hydraulic buffer assembly, characterized in that: The system includes a floating piston (1), a piston valve (2), and a spring (3) located inside the working cylinder (5). The piston valve (2) has compression damping valve plates and restoration damping valve plates arranged in groups on both sides of its valve seat. The outer contour of the piston valve (2) has a stepped structure, including a first boss (21) and a second boss (22). The second boss (22) slides with the working cylinder (5) and has a set of throttling orifices (221). The spring (3) is located at the bottom of the working cylinder (5). The floating piston (1) is located between the spring (3) and the piston valve (2). The floating piston (1) is an annular structure with a central channel (14), including a mounting part (11), a connecting part (12), and a flow part (13) arranged in sequence. The mounting part (11) abuts against the spring (3). The mounting part (11) and the flow part (13) are both slidably engaged with the working cylinder (5). The inner circumferential surface of the flow part (13) is provided with a set of short flow grooves (131) and a set of long flow grooves (132) opened along the axial direction. The outer circumferential diameter of the first boss (21) is adapted to the inner circumferential diameter of the flow part (13). During the compression stroke of the shock absorber, when the outer peripheral surface of the first boss (21) is in contact with the inner peripheral surface of the flow section (13) and does not completely cover the short flow groove (131), the oil in the lower cavity first passes through the short flow groove (131) and the long flow groove (132), and then through the throttling hole (221) to enter the upper cavity; when the outer peripheral surface of the first boss (21) completely covers the short flow groove (131), the oil passes through the long flow groove (132) and the throttling hole (221) in sequence to enter the upper cavity; when the inner bottom surface (134) of the flow section (13) and the lower end surface (211) of the first boss (21) abut against each other, the oil in the lower cavity pushes open the compression damping valve plate on the piston valve (2) and enters the upper cavity.

2. The progressive shock absorber compression hydraulic buffer assembly according to claim 1, characterized in that: There is a gap between the outer peripheral surface of the connecting part (12) and the inner peripheral surface of the working cylinder (5), forming a cavity (6).

3. The progressive shock absorber compression hydraulic buffer assembly according to claim 2, characterized in that: The two ends of the spring (3) are fixedly connected to the bottom cover (10) of the shock absorber and the mounting part (11) of the floating piston (1), respectively.

4. The progressive shock absorber compression hydraulic buffer assembly according to claim 3, characterized in that: The bottom of the working cylinder (5) is provided with a pressure plate (7) that is detachably connected to the bottom cover (10), and the pressure plate (7) fixes the lower end of the spring (3).

5. The progressive shock absorber compression hydraulic buffer assembly according to claim 4, characterized in that: The pressure plate (7) is connected to the bottom cover (10) by bolts.

6. The progressive shock absorber compression hydraulic buffer assembly according to claim 5, characterized in that: The bottom end of the mounting part (11) is provided with a spring mounting groove (111), and a notch baffle (112) is provided on the spring mounting groove (111). The notch baffle (112) is used to limit the upper end of the spring (3).

7. The progressive shock absorber compression hydraulic buffer assembly according to claim 6, characterized in that: The spring mounting groove (111) is provided with an arc-shaped boss (113), and the spring (3) is provided with an arc-shaped groove (31). The arc-shaped boss (113) and the arc-shaped groove (31) form a locking structure for circumferentially limiting the floating piston (1).

8. The progressive shock absorber compression hydraulic buffer assembly according to any one of claims 1-7, characterized in that: The outer peripheral surface of the mounting part (11) is provided with a first sealing groove (114), and the outer peripheral surface of the flow part (13) is provided with a second sealing groove (133). Both the first sealing groove (114) and the second sealing groove (133) are provided with sealing rings (8).

9. The progressive shock absorber compression hydraulic buffer assembly according to claim 8, characterized in that: The sealing ring (8) has an open structure.

10. A compression hydraulic damper, comprising a working cylinder (5) and a gas-liquid combined cylinder (9) communicating with the bottom of the working cylinder (5), wherein the gas-liquid combined cylinder (9) is provided with a sliding oil-gas isolation piston, the oil-gas isolation piston dividing the interior of the gas-liquid combined cylinder (9) into a gas chamber and a liquid chamber, the liquid chamber communicating with the bottom of the working cylinder (5); characterized in that: The vibration damper has a progressive vibration damper compression hydraulic buffer assembly as described in any one of claims 1-9.

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