A frequency-responsive piston valve system

Abstract

The present invention relates to the technical field of automotive shock absorbers, specifically a frequency-responsive piston valve system. The system comprises a base valve system, a piston rod end, and a frequency-responsive valve system. The base valve system is sleeved onto the piston rod end, the frequency-responsive valve system is disposed on one side of the base valve system, a bushing is disposed on one side of the base valve system, a variable throttle is disposed in the middle of the bushing, a throttle inlet is disposed at one end of the bushing, and an oil passage is disposed between the variable throttle and the throttle inlet. A spacer ring is sleeved on the left outer diameter surface of the bushing, the base valve system is disposed on one side of the spacer ring, and a plurality of spring valve discs are disposed on the other side of the spacer ring. Centering rings and compensating valve discs are disposed between the plurality of spring valve discs. A piston valve body is disposed on the right side of the rightmost spring valve disc, the piston valve body is provided with an oil seal groove, and an oil seal is provided between the conical shell and the piston valve body. Compared with the prior art, the present invention is applicable to shock absorber operating conditions with high lateral forces.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile shock absorbers, in particular to a frequency response piston valve system. Background Art

[0002] As a core component of the vehicle chassis, automotive shock absorbers primarily function to attenuate the vibrations and impacts generated during vehicle operation. Ideally, the damping force of a shock absorber should not exhibit sudden changes such as oscillations or jumps. The damping requirements for different vehicle vibration frequencies vary. A vehicle with a characteristic frequency of approximately 1Hz requires a higher damping level for better handling. A wheel with a characteristic frequency of approximately 12Hz requires a lower damping level for better comfort. Enabling frequency-responsive damping in automotive shock absorbers can address the conflict between driving stability, handling, and ride comfort.

[0003] The damping force of an automotive shock absorber is primarily achieved through the internal piston valve system and the bottom valve system, which controls the flow and pressure of the shock absorber oil within the inner cylinder. The frequency-responsive piston valve system can achieve either improved ride comfort while maintaining driving stability or improved driving stability while maintaining driving comfort, depending on the requirements. Summary of the Invention

[0004] To address the aforementioned technical issues, the present invention designs a frequency-responsive piston valve system. This system increases the damping force during the shock absorber's restoring stroke under low-frequency excitation. When the piston rod stretches or compresses, it drives the frequency-responsive piston valve system to reciprocate. The oil in the shock absorber's inner barrel circulates through various channels in the frequency-responsive valve system, generating a damping force that improves ride comfort or enhances driving stability while maintaining driving comfort.

[0005] The present invention provides a frequency-responsive piston valve system, comprising a basic valve system, a piston rod end, and a frequency-responsive valve system. The basic valve system is sleeved on the piston rod end, and a frequency-responsive valve system is provided on one side of the basic valve system. The frequency-responsive valve system comprises a bushing, a spacer ring, a spring valve plate, a centering ring, a compensation valve plate, a piston valve body, a stop ring, a covering valve plate, an oil seal, and a conical shell. A bushing is provided on one side of the basic valve system, a variable throttle port is provided in the middle of the bushing, a throttle inlet is provided at one end of the bushing, an oil passage is provided between the variable throttle port and the throttle inlet, a spacer ring is sleeved on the left outer diameter surface of the bushing, and the spacer ring is provided on the left outer diameter surface of the bushing. A basic valve system is provided on one side, and several spring valve plates are provided on the other side of the spacer ring. Centering rings and compensation valve plates are provided between the several spring valve plates. A piston valve body is provided on the right side of the rightmost spring valve plate, and a circulation groove is provided at one end of the piston valve body. A stop ring and a covering valve plate are provided inside the circulation groove. An oil seal groove is provided on the piston valve body, and an oil seal is provided in the oil seal groove. A conical shell is provided on the outside of the piston valve body, and the conical shell and the piston valve body are sealed by an oil seal. A pressure chamber is provided between the conical shell and the piston valve body, a throttling channel is provided on the piston valve body, and a nut is provided on one side of the conical shell.

[0006] Furthermore, the basic valve system includes a restoring valve plate, a main valve body, a compression valve plate, a pivot valve plate, and a gasket. The spacer ring abuts against the restoring valve plate. One side of the restoring valve plate is provided with the main valve body, the compression valve plate, the pivot valve plate, and the gasket abuts against the step surface of the piston rod end.

[0007] Furthermore, the main valve body is provided with a plurality of restoration bypass holes and a plurality of compression bypass holes, the plurality of restoration bypass holes and the plurality of compression bypass holes are cross-evenly distributed, and a piston skin is sleeved on the outer side of the main valve body.

[0008] Furthermore, an oil guide groove is provided on the end of the piston rod.

[0009] Furthermore, the oil guide groove is communicated with the circulation groove through a variable throttle port, the oil guide groove is communicated with the pressure chamber through a throttle inlet, and the pressure chamber is communicated with the circulation groove through a throttle channel.

[0010] Furthermore, a main gasket is provided on one side of the conical shell, and the main gasket is connected to the conical shell through a nut.

[0011] Furthermore, the cross section of the oil seal is X-shaped.

[0012] Compared with the existing technology, the present invention increases the damping force of the shock absorber's restoring stroke under low-frequency excitation by adopting a frequency-responsive valve system. When the piston rod is stretched or compressed, it will drive the frequency-responsive piston valve system to reciprocate, and the oil in the shock absorber inner tube will flow through various channels of the frequency-responsive valve system to form a damping force. It has strong versatility and can be applied to strut shock absorbers, double-tube shock absorbers and single-tube shock absorbers, and can be applied to shock absorber working conditions with high lateral forces. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is the overall structural diagram of the frequency response piston valve system of the present invention.

[0014] Figure 2 This is a structural diagram of the frequency response valve system of the frequency response piston valve system of the present invention.

[0015] Figure 3 This is an exploded diagram of the frequency response valve system structure of the frequency response piston valve system of the present invention.

[0016] Figure 4 This is the basic valve system diagram of the frequency response piston valve system of the present invention.

[0017] Figure 5 This is an exploded diagram of the basic valve system of the frequency response piston valve system of the present invention.

[0018] Figure 6 This is a structural diagram of the bushing of the frequency response piston valve system of the present invention.

[0019] Figure 7 The piston valve body structure of the frequency response piston valve system of the present invention Figure 1 .

[0020] Figure 8 The piston valve body structure of the frequency response piston valve system of the present invention Figure 2 .

[0021] Figure 9 This is a structural diagram of the oil seal of the frequency response piston valve system of the present invention.

[0022] Figure 10 This is a structural diagram of the main valve body of the frequency response piston valve system of the present invention.

[0023] Figure 11 This is a side view of the main valve body of the frequency response piston valve system of the present invention. Figure 1 .

[0024] Figure 12 This is a side view of the main valve body of the frequency response piston valve system of the present invention. Figure 2 .

[0025] Figure 13 This is a structural diagram of the piston rod end of the frequency response piston valve system of the present invention.

[0026] Figure 14 This is the oil flow diagram for the recovery stroke of the frequency response piston valve system of the present invention.

[0027] Figure 15 This is the oil flow diagram during the compression stroke of the frequency response piston valve system of the present invention.

[0028] Figure 16 This is a diagram showing the final position of the piston valve body during the recovery stroke of the frequency response piston valve system of the present invention.

[0029] Figure 17 This is an application diagram of the frequency response piston valve system of the present invention.

[0030] Figure 18 This is a velocity curve diagram of the damping force of the frequency-responsive piston valve system of the present invention and the non-frequency-responsive valve system.

[0031] Figure 19 This is a frequency response valve system damping force velocity curve diagram of the frequency response piston valve system of the present invention. DETAILED DESCRIPTION

[0032] The present invention will now be further described with reference to the accompanying drawings.

[0033] See also Figure 1-19 The present invention is a frequency-responsive piston valve system, comprising a basic valve system 1, a piston rod end 2, and a frequency-responsive valve system 3. The basic valve system 1 is sleeved on the piston rod end 2, and a frequency-responsive valve system 3 is provided on one side of the basic valve system 1. The frequency-responsive valve system 3 comprises a bushing 4, a spacer ring 5, a spring valve disc 6, a centering ring 7, a compensation valve disc 8, a piston valve body 9, a stop ring 10, a covering valve disc 11, an oil seal 12, and a conical shell 13. A bushing 4 is provided on one side of the basic valve system 1, a variable throttle port 14 is provided in the middle of the bushing 4, a throttle inlet 15 is provided at one end of the bushing 4, and an oil passage 16 is provided between the variable throttle port 14 and the throttle inlet 15. A spacer ring 5 is sleeved on the left outer diameter surface of the bushing 4, and one side of the spacer ring 5 A basic valve system 1 is provided, and several spring valve discs 6 are provided on the other side of the spacer ring 5. Centering rings 7 and compensation valve discs 8 are provided between the several spring valve discs 6. A piston valve body 9 is provided on the right side of the rightmost spring valve disc 6, and a circulation groove 17 is provided on the left end of the piston valve body 9. A stop ring 10 and a covering valve disc 11 are provided inside the circulation groove 17. An oil seal groove 18 is provided on the piston valve body 9, and an oil seal 12 is provided in the oil seal groove 18. A conical shell 13 is provided on the outside of the piston valve body 9, and the conical shell 13 and the piston valve body 9 are sealed by the oil seal 12. A pressure chamber 19 is provided between the conical shell 13 and the piston valve body 9, a throttling channel 20 is provided on the piston valve body 9, and a nut 21 is provided on one side of the conical shell 13.

[0034] The basic valve system 1 includes a restoring valve disc 22, a main valve body 23, a compression valve disc 24, a pivot valve disc 25, and a gasket 26. The spacer ring 5 abuts the restoring valve disc 22. The main valve body 23, compression valve disc 24, pivot valve disc 25, and gasket 26 are sequentially arranged on one side of the restoring valve disc 22. The gasket 26 abuts against the stepped surface of the piston rod end 2. The main valve body 23 is provided with a plurality of restoring bypass holes 27 and a plurality of compression bypass holes 28, which are evenly distributed in a crosswise pattern. A piston sleeve 29 is sleeved on the outer side of the main valve body 23. The piston rod end 2 is provided with an oil guide groove 30. The oil guide groove 30 communicates with the flow groove 17 through the variable throttle 14. The oil guide groove 30 communicates with the pressure chamber 19 through the throttle inlet 15. The pressure chamber 19 communicates with the flow groove 17 through the throttle channel 20. A main gasket 31 is provided on one side of the conical shell 13, and the main gasket 31 is connected to the conical shell 13 via a nut 21. The cross section of the oil seal 12 is X-shaped.

[0035] When implementing:

[0036] As attached Figure 17 As shown, the present invention is mounted on the piston rod tip 2 of the shock absorber and placed within the shock absorber's inner cylinder, which is then placed inside the outer cylinder. When the piston rod stretches or compresses, it drives the frequency-responsive piston valve system to reciprocate. The oil in the shock absorber's inner cylinder circulates through the various channels of the frequency-responsive piston valve system, generating a damping force.

[0037] The present invention comprises a basic valve system 1, a piston rod end 2, and a frequency response valve system 3.

[0038] The piston rod end 2 is located at the end of the piston rod and is provided with a step surface. An oil guide groove 30 is axially provided along the outer diameter of the cylindrical surface of the end from the step surface to form an oil flow channel.

[0039] The basic valve system 1 comprises a restoring valve disc 22, a main valve body 23, a compression valve disc 24, a pivot valve disc 25, and a gasket 26. The gasket 26 contacts the stepped surface of the piston rod end 2 and is located at the top of the actual valve system structure. According to the current diagram, the pivot valve disc 25, the compression valve disc 24, the main valve body 23, and the restoring valve disc 22 are installed in sequence from left to right. The pivot valve disc 25 is the smallest and serves as the valve opening fulcrum for the compression valve disc 24. The compression valve disc 24 includes 3 to 5 circular valve discs. The damping force of the compression stroke can be adjusted by adjusting the number, diameter, and thickness of these valve discs. The main valve body 23 is provided with 6 restoring bypass holes 27 and 3 compression bypass holes 28. The restoring bypass holes 27 are arranged in groups of two and are evenly distributed on the main valve body 23 in a cross pattern with the compression bypass holes 28. The outer diameter of the main valve body 23 is covered with a piston skin 29, a polymer diaphragm that reduces friction between the main valve body 23 and the inner wall of the inner cylinder. The restoring valve disc 22 includes three to five circular discs, and the damping force of the restoring stroke can be adjusted by adjusting the number, diameter, and thickness of these discs.

[0040] The frequency-responsive valve system 3 comprises a bushing 4, a spacer ring 5, a spring valve disc 6, a centering ring 7, a compensating valve disc 8, a piston valve body 9, a stop ring 10, a cover valve disc 11, an oil seal 12, and a conical shell 13. The bushing 4 is mounted on the piston rod end 2 and has three steps. The bushing 4 contains a chamber, a variable throttle 14 on the side, and a throttle inlet 15 on the right side, connecting to an oil passage. The spacer ring 5 is mounted on the outer diameter of the leftmost step of the bushing 4, contacting the restoring valve disc 22. The spring valve disc 6 is mounted on the other side. Centering rings 7 and compensating valve discs 8 are located between the spring valve discs 6. The spring valve discs 5 include two or three circular discs, and the damping force of each stroke segment can be adjusted by adjusting the number, diameter, and thickness of these discs. The piston valve body 9 is mounted to the right of the spring valve disc 6 and mounted on the outer diameter of the three steps of the bushing 4. Inside the piston valve, a stop ring 10 and a cover valve disc 11 are mounted on the outer diameter of the secondary step of the bushing 4. An oil seal groove 18 is provided on the side of the piston valve body 9 for mounting an oil seal 12. The oil seal 12 has an X-shaped cross-section. A conical housing 13 is located to the right of the piston valve body 9 and fits over the piston rod end 2. The oil seal 12 seals the conical housing 13 and the piston valve body 9. A pressure chamber 19 is provided between the conical housing 13 and the piston valve body 9.

[0041] The variable throttle port 14, the throttle inlet 15, the pressure chamber 19 and the throttle channel 20 form a connected oil passage. A main gasket 31 is provided on one side of the conical shell 13. The main gasket 31 is tightened by a nut 21 to fix and lock the entire valve system.

[0042] After the valve system is installed, the nut 21 and the piston rod end 2 are riveted with a punch to break the thread and prevent the nut from rotating and loosening.

[0043] Frequency-responsive piston valve train operation results in frequency-dependent variations in the damping force, which are achieved by a frequency-dependent additional spring force on the restoring side of the basic valve train 1 .

[0044] As attached Figure 14 As shown, when the piston rod moves in the restoring direction, the pressure in the working chamber on the left side of the piston valve body 9 directs oil through the oil guide groove 30 in the piston rod end 2 to the throttle inlet 15. Through this small throttle inlet 15, the pressure chamber 19 is filled. The filling rate depends on the area ratio between the throttle inlet 15 and the outlet of the throttle channel 20. The pressure generated in the pressure chamber 19 acts on the right end face of the piston valve body 9, generating a force that causes the piston valve body 9 to move, overcoming the resistance of the spring valve disc 6 and preloading it through the centering ring 7. The resulting additional force is transmitted to the restoring valve disc 22 of the basic valve system 1 via the spacer ring 5.

[0045] The movement of the piston valve body 9 is finally limited by the stop ring 10, so the maximum additional force is limited, and this position is called the "end position". Figure 16 shown.

[0046] The piston movement of the piston valve body 9 is a key technology of the present invention.

[0047] When the shock absorber recovers at low frequencies, the oil has ample time to flow through the throttle inlet 15, filling the pressure chamber 19 and moving the piston valve body 9 to the aforementioned "end position." Under these conditions, the damping force is the sum of the spring force of the restoring valve disc 22 of the basic valve system 1 and the additional force generated by the leftward displacement of the piston valve body 9. This additional force strengthens the spring force of the restoring valve disc 22, increasing the damping force in the recovery direction, thus achieving high damping force at low frequencies.

[0048] When the shock absorber recovers at high frequency, there is a correlation between the excitation frequency and the filling amount of the pressure chamber 19. The higher the frequency and the smaller the filling amount, the smaller the displacement of the piston valve body 9, the smaller the additional force generated, and the amplitude of the increase in the damping force in the recovery direction becomes smaller, thus achieving the purpose of high frequency and low damping force.

[0049] As attached Figure 18 、 19 As shown in the figure, the damping force of shock absorbers with and without frequency-responsive piston valve systems was tested using a dynamometer. The resulting damping force-velocity curves are compared to demonstrate that the damping force during the return stroke of the shock absorber with the frequency-responsive piston valve system significantly increases when excited in the 1Hz to 12Hz frequency range, achieving variable damping. This significantly balances the conflict between vehicle stability and handling and ride comfort.

[0050] In summary, the primary feature of the frequency-responsive piston valve system is its ability to increase the damping force during the shock absorber's restoring stroke under low-frequency excitation. Its versatility allows it to be applied to strut, twin-tube, and monotube shock absorbers, and it can be used in applications involving high lateral forces.

Claims

1. A frequency-responsive piston valve system, characterized in that: The invention comprises a basic valve system (1), a piston rod end (2), and a frequency response valve system (3), wherein the basic valve system (1) is sleeved on the piston rod end (2), and a frequency response valve system (3) is provided on one side of the basic valve system (1), and the frequency response valve system (3) comprises a bushing (4), a spacer ring (5), a spring valve plate (6), a centering ring (7), a compensation valve plate (8), a piston valve body (9), a stop ring (10), a covering valve plate (11), an oil seal (12), and a conical shell (13), wherein the basic valve system (1) A bushing (4) is provided on one side, a variable throttle port (14) is provided in the middle of the bushing (4), a throttle inlet (15) is provided at one end of the bushing (4), an oil passage (16) is provided between the variable throttle port (14) and the throttle inlet (15), a spacer ring (5) is sleeved on the left outer diameter surface of the bushing (4), a basic valve system (1) is provided on one side of the spacer ring (5), a plurality of spring valve plates (6) are provided on the other side of the spacer ring (5), a centering ring (7) and a compensation valve plate (8) are provided between the plurality of spring valve plates (6), a piston valve body (9) is provided on the right side of the rightmost spring valve plate (6), and the piston valve body ( 9) is provided with a circulation groove (17) at the left end, a stop ring (10) and a covering valve plate (11) are provided inside the circulation groove (17), an oil seal groove (18) is provided on the piston valve body (9), an oil seal (12) is provided in the oil seal groove (18), a conical shell (13) is provided on the outer side of the piston valve body (9), an oil seal (12) is provided between the conical shell (13) and the piston valve body (9), a pressure chamber (19) is provided between the conical shell (13) and the piston valve body (9), a throttling channel (20) is provided on the piston valve body (9), and a nut (21) is provided on one side of the conical shell (13); The piston rod end (2) is provided with an oil guide groove (30); The oil guide groove (30) is connected to the circulation groove (17) through the variable throttle port (14), the oil guide groove (30) is connected to the pressure chamber (19) through the throttle inlet (15), and the pressure chamber (19) is connected to the circulation groove (17) through the throttle channel (20).

2. A frequency-responsive piston valve system according to claim 1, characterized in that: The basic valve system (1) comprises a restoring valve disc (22), a main valve body (23), a compression valve disc (24), a pivot valve disc (25), and a gasket (26); the spacer ring (5) abuts against the restoring valve disc (22); one side of the restoring valve disc (22) is provided with the main valve body (23), the compression valve disc (24), the pivot valve disc (25), and a gasket (26) in sequence; the gasket (26) abuts against the step surface of the piston rod end (2).

3. The frequency-responsive piston valve system according to claim 2, characterized in that: The main valve body (23) is provided with a plurality of restoration bypass holes (27) and a plurality of compression bypass holes (28), wherein the plurality of restoration bypass holes (27) and the plurality of compression bypass holes (28) are evenly distributed in a cross pattern, and a piston skin (29) is sleeved on the outer side of the main valve body (23).

4. The frequency-responsive piston valve system according to claim 1, characterized in that: A main gasket (31) is provided on one side of the conical shell (13), and the main gasket (31) is connected to the conical shell (13) via a nut (21).

5. The frequency-responsive piston valve system according to claim 1, characterized in that: The cross section of the oil seal (12) is X-shaped.

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