A dual-motor dual-adjustable damping force device

Abstract

This invention discloses a dual-motor, dual-adjustment damping force device, belonging to the field of hydraulic vibration damper damping adjustment technology. It includes a pressure regulating valve seat, within which a pressure regulating valve assembly is installed. The power input end of the pressure regulating valve assembly is connected to a dual-motor drive assembly via gear meshing. The pressure regulating valve seat contains a tension channel and a compression channel, respectively connected to the pressure regulating valve assembly. An oil circuit volume adjustment assembly is installed behind the pressure regulating valve seat. The pressure regulating valve assembly, the tension channel, and the compression channel are all connected to the oil circuit volume adjustment assembly. A first check valve and a second check valve, respectively, are installed in the tension channel and the compression channel, allowing oil to flow only from the oil circuit volume adjustment assembly to the pressure regulating valve seat. This invention employs the aforementioned dual-motor, dual-adjustment damping force device, which has a compact and reliable structure. It enables completely independent adjustment of damping force under tension and compression conditions, effectively reducing vibration and impact, and significantly improving equipment operation smoothness and component durability.

Description

Technical Field

[0001] This invention relates to the field of hydraulic damper damping adjustment technology, and in particular to a dual-motor dual-adjustment damping force device. Background Technology

[0002] Currently, in the field of hydraulic shock absorber damping adjustment technology, the damping force adjustment performance of shock absorbers directly affects the ride comfort, handling stability, and component lifespan of equipment (such as vehicles and construction machinery). Existing technologies mostly employ a single-motor-driven, single-regulating-valve structure for hydraulic shock absorber damping adjustment, which can only achieve damping force adjustment under a single tensile or compressive condition, or indirectly achieve coordinated damping adjustment under tensile and compressive conditions through a mechanical linkage mechanism. This approach has many limitations.

[0003] (1) Poor adjustment independence: In the single motor drive mode, the damping force adjustment of the tension and compression conditions is related to each other. It is impossible to make independent and precise personalized adjustments according to the actual working conditions, and it is difficult to take into account the damping needs of different road conditions (such as bumpy roads and flat roads) or load conditions.

[0004] (2) Insufficient adjustment accuracy and range: The through hole diameter of the traditional mechanical linkage adjustment mechanism is fixed, the damping force adjustment range is limited, and damping sudden change is easy to occur during the adjustment process, resulting in a harsh damping effect and an inability to achieve a smooth transition.

[0005] (3) Weak adaptability of oil circuit: During the stretching and compression cycle of hydraulic damper, the extension and retraction of piston rod will cause dynamic changes in oil circuit volume. Existing devices lack an effective adaptive compensation mechanism for oil circuit volume, which is prone to problems such as oil pressure fluctuation, cavitation or damping failure, affecting the stability of regulation.

[0006] (4) Limited reliability and lifespan: Some devices do not take into account the high temperature transmission problem generated by the hydraulic oil during operation. High temperature can easily lead to performance degradation or damage of the drive motor (servo motor); at the same time, the unidirectional flow structure design is unreasonable, which can easily cause oil backflow interference and reduce the effectiveness of damping adjustment.

[0007] Therefore, there is an urgent need for a damping force adjustment device that can achieve independent and precise adjustment under tension and compression conditions, has adaptive oil circuit volume compensation, and has a reliable structure, in order to overcome the shortcomings of existing technologies. Summary of the Invention

[0008] The purpose of this invention is to provide a dual-motor, dual-adjustment damping force device with a compact and reliable structure. It can achieve completely independent adjustment of damping force under tension and compression conditions, effectively reduce vibration and impact, and significantly improve the smoothness of equipment operation and the durability of components.

[0009] To achieve the above objectives, the present invention provides a dual-motor dual-adjustment damping force device, comprising a pressure regulating valve seat, a pressure regulating valve assembly installed inside the pressure regulating valve seat, the power input end of the pressure regulating valve assembly being disposed in a gearbox fixedly connected to the front end of the pressure regulating valve seat, a dual-motor drive assembly connected to the pressure regulating valve assembly via gear meshing on the gearbox; the pressure regulating valve seat having a tension channel and a compression channel respectively communicating with the pressure regulating valve assembly; an oil circuit volume regulating assembly installed behind the pressure regulating valve seat, the pressure regulating valve assembly, the tension channel, and the compression channel all communicating with the oil circuit volume regulating assembly, and a first check valve and a second check valve respectively installed in the tension channel and the compression channel, allowing only oil to flow from the oil circuit volume regulating assembly to the pressure regulating valve seat.

[0010] Preferably, the pressure regulating valve assembly includes a compression pressure regulating valve and a tension pressure regulating valve. The tension pressure regulating valve is sleeved on the front end of the compression pressure regulating valve, and an oil passage chamber is provided between the compression pressure regulating valve and the tension pressure regulating valve. The tension pressure regulating valve has tension adjustment oil passage holes of different diameters circumferentially opened on the side wall of the oil passage chamber, and the outer side of the tension adjustment oil passage holes communicates with the tension channel. The compression pressure regulating valve has a fourth oil passage hole on the side wall of the oil passage chamber, and the interior of the rear end of the compression pressure regulating valve is configured as a cavity structure communicating with the fourth oil passage hole. The side wall of the rear end of the compression pressure regulating valve has compression adjustment oil passage holes of different diameters circumferentially opened, and the outer side of the compression adjustment oil passage holes communicates with the compression channel.

[0011] Preferably, the front ends of the compression regulating valve and the tension regulating valve are respectively connected to a driven compression regulating gear and a driven tension regulating gear located in the gearbox;

[0012] The dual-motor drive assembly includes a compression pressure regulating servo and a tension pressure regulating servo respectively connected to the outside of the gearbox. The power output ends of the compression pressure regulating servo and the tension pressure regulating servo are respectively connected to an active compression regulating gear and an active tension regulating gear located inside the gearbox. The active compression regulating gear is meshed with the driven compression regulating gear, and the active tension regulating gear is meshed with the driven tension regulating gear.

[0013] Preferably, the outer sides of the compression pressure regulating servo and the tension pressure regulating servo are fitted with motor covers fixed to the outer wall of the gearbox.

[0014] Preferably, a pressure regulating valve inner cover installed at the tail of the pressure regulating valve seat is provided between the pressure regulating valve seat and the oil circuit volume regulating assembly. The pressure regulating valve inner cover has a through first oil passage hole, a second oil passage hole and a third oil passage hole. The two ends of the first oil passage hole are respectively connected to the inner cavity of the compression pressure regulating valve and the oil circuit volume regulating assembly. The two ends of the second oil passage hole are respectively connected to the stretching channel and the oil circuit volume regulating assembly. The two ends of the third oil passage hole are respectively connected to the compression channel and the oil circuit volume regulating assembly.

[0015] Preferably, the first check valve is installed in the tension channel between the tension adjustment oil passage and the second oil passage, and the second check valve is installed in the compression channel between the compression adjustment oil passage and the third oil passage.

[0016] Preferably, the oil circuit volume regulating assembly includes an oil circuit volume regulating chamber fixedly connected to the pressure regulating valve seat. A slide valve is slidably disposed in the middle of the oil circuit volume regulating chamber. The front end of the slide valve is configured as a damping hydraulic oil chamber that communicates with the pressure regulating valve assembly, the tension channel, and the compression channel. The rear end of the slide valve is configured as a sealed gas regulating chamber.

[0017] Preferably, the gas regulating chamber is filled with nitrogen gas.

[0018] Preferably, a heat insulation plate is provided between the pressure regulating valve seat and the gearbox.

[0019] Preferably, the tension channel is connected to the tension oil pipe of the hydraulic damper, and the compression channel is connected to the compression oil pipe of the hydraulic damper.

[0020] Therefore, the beneficial effects of the above-mentioned dual-motor dual-adjustment damping force device in this invention are as follows:

[0021] (1) Dual independent adjustment for wider adaptability: The system adopts dual motors for independent drive, namely a compression pressure regulating servo motor and a tension pressure regulating servo motor, which correspond to the compression pressure regulating valve and the tension pressure regulating valve respectively, so as to realize the completely independent adjustment of damping force under tension and compression conditions. The damping parameters of a single or dual working condition can be flexibly adjusted according to the actual working conditions (such as vehicle acceleration, braking, turning or different road conditions), taking into account both smoothness and handling, and adapting to a variety of usage scenarios.

[0022] (2) High adjustment accuracy and rich range of levels: Both the compression pressure regulating valve and the tension pressure regulating valve are circumferentially equipped with multiple sets of oil passage holes of different diameters. The valve is rotated by a motor to achieve the switching of different passage holes. The damping force adjustment range is rich and the switching is smooth without sudden change. At the same time, the gear meshing transmission structure has high transmission efficiency and precise positioning, which further improves the accuracy and repeatability of damping adjustment.

[0023] (3) Adaptive oil circuit volume and strong stability: An oil circuit volume adjustment component with a nitrogen-filled gas adjustment chamber is set up. The oil circuit volume change caused by the extension and retraction of the piston rod of the hydraulic damper is compensated by the sliding of the slide valve, ensuring that the oil pressure in the oil circuit is constant and avoiding problems such as cavitation and pressure fluctuation. With the cooperation of the one-way valve design in the tension channel and the compression channel, the oil flow direction is strictly limited, ensuring that the damping adjustment process is not disturbed by the oil backflow and improving the operating stability of the device.

[0024] (4) Reliable structure and long service life: A heat insulation plate is added between the pressure regulating valve seat and the gearbox to effectively isolate the high temperature generated by the hydraulic oil during operation, avoid the drive servo motor from decaying or being damaged due to high temperature, and extend the service life of the motor; a motor guard is set on the outside of the motor to prevent external impurities from entering and improve the anti-interference ability of the device; each component adopts modular assembly, which is compact, easy to disassemble and assemble, and easy to maintain.

[0025] (5) High efficiency of damping adjustment and excellent shock absorption effect: The design of the oil passage chamber and multiple oil passage holes ensures smooth oil flow and small damping force loss; the combination of independent control of dual motors and multi-level adjustment can quickly respond to changes in working conditions, achieve precise matching of damping force, effectively reduce vibration and impact during equipment operation, and improve driving smoothness and service life of parts.

[0026] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0027] Figure 1 This is a cross-sectional schematic diagram of an embodiment of a dual-motor dual-adjustable damping force device according to the present invention;

[0028] Figure 2 This is a schematic diagram of the connection between a dual-motor dual-adjustable damping force device and a hydraulic shock absorber according to the present invention;

[0029] Figure 3 This is a schematic diagram of the AA-plane cross-section of a dual-motor dual-adjustable damping force device according to the present invention;

[0030] Figure 4 This is a schematic diagram of the BB cross-section of a dual-motor dual-adjustable damping force device according to the present invention;

[0031] Figure 5 This is a schematic diagram of the connection structure of the compression pressure regulating servo and the tension pressure regulating servo of the dual-motor dual-adjustment damping force device of the present invention.

[0032] Figure Labels

[0033] 1. Pressure regulating valve seat; 2. Tension channel; 3. First check valve; 4. Pressure regulating valve inner cover; 5. First oil passage hole; 61. Second oil passage hole; 62. Third oil passage hole; 7. Compression channel; 8. Second check valve; 9. Compression pressure regulating valve; 10. Driven compression adjusting gear; 11. Fourth oil passage hole; 12. Compression adjusting oil passage hole; 13. Tension pressure regulating valve; 14. Driven tension adjusting gear; 15. Tension adjusting oil passage hole; 151. Oil passage chamber; 16. Motor cover; 17. Compression pressure regulating servo; 171. Active compression adjusting gear; 18. Tension pressure regulating servo; 181. Active tension adjusting gear; 19. Gearbox; 20. Heat insulation plate; 21. Oil circuit volume regulating chamber; 22. Spool valve; 23. Damping hydraulic oil chamber; 24. Gas regulating chamber; 25. Hydraulic shock absorber; 26. Tension oil pipe; 27. Compression oil pipe. Detailed Implementation

[0034] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0035] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0036] Example 1:

[0037] like Figure 1 As shown, the present invention provides a dual-motor dual-adjustment damping force device, including a pressure regulating valve seat 1, which provides installation positions for various parts of the entire damping force device. The pressure regulating valve seat 1 is equipped with a pressure regulating valve assembly, which is used to adjust the oil damping force of the hydraulic damper 25 under tension and compression conditions, and is the core component of the entire damping force device.

[0038] The power input end of the pressure regulating valve assembly is located inside a gearbox 19 fixedly connected to the front end of the pressure regulating valve seat 1. A dual-motor drive assembly, connected to the pressure regulating valve assembly via gear meshing, is mounted on the gearbox 19 to provide the necessary driving force for the operation of the pressure regulating valve assembly. The pressure regulating valve seat 1 internally has a tension channel 2 and a compression channel 7 respectively communicating with the pressure regulating valve assembly. Figure 2 As shown, the tension channel 2 is connected to the tension oil pipe 26 of the hydraulic damper 25, and the compression channel 7 is connected to the compression oil pipe 27 of the hydraulic damper 25, which is used to transmit the adjustment effect of the pressure regulating valve assembly to the hydraulic damper 25 (the hydraulic damper 25 in this embodiment adopts the existing technology, so the structural parts of the hydraulic damper 25 will not be described in detail).

[0039] An oil circuit volume adjustment assembly is installed behind the pressure regulating valve seat 1, which enables adaptive adjustment of the oil circuit volume of the hydraulic damper 25 under different operating conditions, and also allows the tension channel 2 and the compression channel 7 to form a circulation loop. The pressure regulating valve assembly, tension channel 2, and compression channel 7 are all connected to the oil circuit volume adjustment assembly, and the tension channel 2 and compression channel 7 are respectively equipped with a first check valve 3 and a second check valve 8 that only allow oil to flow from the oil circuit volume adjustment assembly to the pressure regulating valve seat 1. This ensures that the oil inside the pressure regulating valve seat 1 is always regulated by the pressure regulating valve assembly under different operating conditions, thus ensuring the effective regulation of oil damping by the damping force device.

[0040] The specific structure is as follows:

[0041] Among them, such as Figure 1 As shown, the pressure regulating valve assembly includes a compression pressure regulating valve 9 and a tension pressure regulating valve 13. The tension pressure regulating valve 13 is sleeved on the front end of the compression pressure regulating valve 9, and the compression pressure regulating valve 9 and the tension pressure regulating valve 13 are tightly fitted together, preventing oil from flowing through the contact portion between them. An oil passage chamber 151 is provided between the compression pressure regulating valve 9 and the tension pressure regulating valve 13 to ensure smooth oil flow at all times.

[0042] The tension regulating valve 13 is located on the side wall of the oil passage chamber 151, and has tension regulating oil passage holes 15 of different diameters circumferentially opened. The outer side of the tension regulating oil passage hole 15 is connected to the tension channel 2. For example Figure 3 As shown, in this embodiment, there are 8 tension adjustment oil passage holes 15 with different diameters on the side wall of the tension regulating valve 13, which can realize the adjustment of 8 levels of hydraulic resistance under the tension condition of the hydraulic damper 25 (the number of corresponding tension adjustment oil passage holes 15 can also be set as needed).

[0043] The compression regulating valve 9 has a fourth oil passage hole 11 on the side wall of the oil passage chamber 151. The interior of the rear end of the compression regulating valve 9 is configured as a cavity structure communicating with the fourth oil passage hole 11. The side wall of the rear end of the compression regulating valve 9 has compression regulating oil passage holes 12 of different diameters circumferentially opened. The outer side of the compression regulating oil passage hole 12 is connected to the compression channel 7. Figure 4 As shown, in this embodiment, there are 8 compression adjustment oil passage holes 12 with different diameters on the side wall of the compression regulating valve 9, which can realize the adjustment of 8 levels of hydraulic resistance under the compression condition of the hydraulic damper 25 (the number of corresponding compression adjustment oil passage holes 12 can also be set as needed).

[0044] like Figure 5 As shown, the front ends of the compression regulating valve 9 and the tension regulating valve 13 are respectively connected to the driven compression regulating gear 10 and the driven tension regulating gear 14 located in the gearbox 19. The dual-motor drive assembly includes a compression pressure regulating servo motor 17 and a tension pressure regulating servo motor 18 (both compression pressure regulating servo motors 17 and 18 are specific angle regulating motors) connected to the outside of the gearbox 19. The power output ends of the compression pressure regulating servo motor 17 and the tension pressure regulating servo motor 18 are respectively connected to the active compression regulating gear 171 and the active tension regulating gear 181 located in the gearbox 19. The active compression regulating gear 171 is meshed with the driven compression regulating gear 10, and the active tension regulating gear 181 is meshed with the driven tension regulating gear 14, so that the compression pressure regulating servo motor 17 and the tension pressure regulating servo motor 18 provide driving force for the angle adjustment of the compression regulating valve 9 and the tension regulating valve 13, respectively.

[0045] The compression pressure regulating servo motor 17 and the tension pressure regulating servo motor 18 are fitted with motor covers 16 fixed to the outer wall of the gearbox 19. This effectively isolates the compression pressure regulating servo motor 17 and the tension pressure regulating servo motor 18 from the outside environment, preventing damage to them due to the intrusion of external substances. Both the compression pressure regulating servo motor 17 and the tension pressure regulating servo motor 18 are connected to the control system in the driver's cab via wiring. The control system allows for the adjustment of the operating status of the compression pressure regulating servo motor 17 and the tension pressure regulating servo motor 18.

[0046] Furthermore, when the hydraulic damper 25 operates for a long time, the hydraulic oil is prone to high temperature. In order to prevent the high temperature of the hydraulic oil from being transmitted to the compression pressure regulating servo motor 17 and the tension pressure regulating servo motor 18 and causing damage to the servo motors (the operating temperature of the servo motors generally does not exceed 80 degrees Celsius), in this embodiment, a heat insulation plate 20 is provided between the pressure regulating valve seat 1 and the gearbox 19, which can effectively isolate the high temperature inside the pressure regulating valve seat 1 and greatly improve the service life of the servo motors.

[0047] like Figure 1 As shown, a pressure regulating valve inner cover 4 installed at the tail of the pressure regulating valve seat 1 is provided between the pressure regulating valve seat 1 and the oil circuit volume regulating assembly. The pressure regulating valve inner cover 4 has a through first oil passage hole 5, a second oil passage hole 61, and a third oil passage hole 62. The two ends of the first oil passage hole 5 are connected to the inner cavity of the compression pressure regulating valve 9 and the oil circuit volume regulating assembly, respectively. The two ends of the second oil passage hole 61 are connected to the tension channel 2 and the oil circuit volume regulating assembly, respectively. The two ends of the third oil passage hole 62 are connected to the compression channel 7 and the oil circuit volume regulating assembly, respectively.

[0048] The first check valve 3 is installed in the tension channel 2 between the tension adjustment oil passage 15 and the second oil passage 61, ensuring that the opening or closing of the first check valve 3 will not affect the oil passage between the tension channel 2 and the pressure regulating valve assembly. Similarly, the second check valve 8 is installed in the compression channel 7 between the compression adjustment oil passage 12 and the third oil passage 62. Likewise, the opening or closing of the second check valve 8 will not affect the oil passage between the compression channel 7 and the pressure regulating valve assembly, thus ensuring the stable regulation of hydraulic pressure by the pressure regulating valve assembly under different operating conditions.

[0049] The hydraulic circuit volume adjustment assembly includes an hydraulic circuit volume adjustment chamber 21 fixedly connected to the pressure regulating valve seat 1. A slide valve 22 is slidably disposed in the middle of the hydraulic circuit volume adjustment chamber 21, which can slide within the hydraulic circuit volume adjustment chamber 21 to adjust the hydraulic circuit volume. The front end of the slide valve 22 is configured as a damping hydraulic oil chamber 23, which is connected to the pressure regulating valve assembly, the tension channel 2, and the compression channel 7. This chamber can be considered as a transfer area for the oil inside the pressure regulating valve seat 1. The rear end of the slide valve 22 is configured as a sealed gas adjustment chamber 24, which is filled with inert gas. The gas in the gas adjustment chamber 24 changes its volume by moving the slide valve 22 depending on the pressure it receives, thereby adjusting the hydraulic circuit volume. In this embodiment, the gas adjustment chamber 24 is filled with nitrogen (other gases can also be used as needed), which enables the hydraulic circuit volume adjustment assembly to have excellent hydraulic circuit volume adjustment effect and ensures the stable operation of the hydraulic damper 25.

[0050] Working principle:

[0051] When the hydraulic damper 25 is in compression mode, the oil inside the hydraulic damper 25 flows into the pressure regulating valve seat 1 through the compression oil pipe 27 along the compression channel 7. Under the obstruction of the second check valve 8, the oil in the compression channel 7 can only enter the cavity of the compression regulating valve 9 through the compression regulating oil passage 12. Part of the oil flows into the tension channel 2 through the fourth oil passage 11-oil passage chamber 151-tension regulating oil passage 15, and another part flows into the tension channel 2 through the first oil passage 5-damping hydraulic oil chamber 23-second oil passage 61-first check valve 3. All the oil then flows back to the hydraulic damper 25 through the tension oil pipe 26. During the entire compression process, by adjusting the angle of the compression regulating valve 9 through the compression pressure regulating servo motor 17, different orifice sizes of the compression regulating oil passage 12 can be selected, thereby achieving the adjustment of the damping force under the compression mode of the hydraulic damper 25. In addition, since the hydraulic damper 25 is in compression condition, the piston rod of the hydraulic damper 25 occupies part of the oil volume. Under the action of oil pressure, the slide valve 22 automatically slides to the gas regulating chamber 24, ensuring the constant oil volume in the entire hydraulic circuit.

[0052] When the hydraulic damper 25 is in tension condition, the oil inside the hydraulic damper 25 flows into the pressure regulating valve seat 1 through the tension oil pipe 26 along the tension channel 2. The oil inside the tension channel 2, blocked by the first check valve 3, can only enter the oil passage chamber 151 through the tension adjustment oil passage hole 15, and then flows back into the hydraulic damper 25 through the fourth oil passage hole 11 – the inner cavity of the compression pressure regulating valve 9 – the first oil passage hole 5 – the damping hydraulic oil chamber 23 – the third oil passage hole 63 – the second check valve 8 – the compression channel 7 – the compression oil pipe 27. Throughout the tensioning process, by adjusting the angle of the tension pressure regulating valve 13 through the tension pressure regulating servo motor 18, different diameter tension adjustment oil passage holes 15 can be selected, thus achieving the adjustment of the damping force under the tensioning condition of the hydraulic damper 25. Furthermore, since the hydraulic damper 25 is under tension, the piston rod of the hydraulic damper 25 reduces its encroachment on the hydraulic oil circuit volume, and the pressure of the internal oil is relatively reduced, causing the slide valve 22 to automatically slide towards the damping hydraulic oil chamber 23, thus ensuring the constant oil volume in the entire hydraulic oil circuit.

[0053] Therefore, the present invention adopts the above-mentioned dual-motor dual-adjustment damping force device, which has a compact and reliable structure. It can realize completely independent adjustment of damping force under tension and compression conditions, and achieve smooth, efficient and high-precision adjustment of damping force. It can effectively reduce vibration and impact, and greatly improve the smoothness of equipment operation and the durability of parts.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A dual motor dual adjustment damping force device characterized by: The device includes a pressure regulating valve seat, within which a pressure regulating valve assembly is installed. The power input end of the pressure regulating valve assembly is located in a gearbox fixedly connected to the front end of the pressure regulating valve seat. A dual-motor drive assembly, which is connected to the pressure regulating valve assembly via gear meshing, is mounted on the gearbox. The pressure regulating valve seat contains a tension channel and a compression channel, which are respectively connected to the pressure regulating valve assembly. An oil circuit volume regulating assembly is installed behind the pressure regulating valve seat. The pressure regulating valve assembly, the tension channel, and the compression channel are all connected to the oil circuit volume regulating assembly. A first check valve and a second check valve, which allow oil to flow only from the oil circuit volume regulating assembly to the pressure regulating valve seat, are respectively installed in the tension channel and the compression channel. The pressure regulating valve assembly includes a compression pressure regulating valve and a tension pressure regulating valve. The tension pressure regulating valve is sleeved on the front end of the compression pressure regulating valve, and an oil passage chamber is formed between the compression pressure regulating valve and the tension pressure regulating valve. The tension pressure regulating valve has tension adjustment oil passage holes of different diameters circumferentially opened on the side wall of the oil passage chamber, and the outer side of the tension adjustment oil passage holes communicates with the tension channel. The compression pressure regulating valve has a fourth oil passage hole on the side wall of the oil passage chamber. The interior of the rear end of the compression pressure regulating valve is configured as a cavity structure communicating with the fourth oil passage hole. The side wall of the rear end of the compression pressure regulating valve has compression adjustment oil passage holes of different diameters circumferentially opened, and the outer side of the compression adjustment oil passage holes communicates with the compression channel.

2. A dual motor dual adjustment damping force device according to claim 1, characterized in that: The front ends of the compression regulating valve and the tension regulating valve are respectively connected to the driven compression regulating gear and the driven tension regulating gear located in the gearbox. The dual-motor drive assembly includes a compression pressure regulating servo and a tension pressure regulating servo respectively connected to the outside of the gearbox. The power output ends of the compression pressure regulating servo and the tension pressure regulating servo are respectively connected to an active compression regulating gear and an active tension regulating gear located inside the gearbox. The active compression regulating gear is meshed with the driven compression regulating gear, and the active tension regulating gear is meshed with the driven tension regulating gear.

3. A dual motor dual adjustment damping force device according to claim 2, characterized by: The compression pressure regulating servo and the tension pressure regulating servo are fitted with motor covers fixed to the outer wall of the gearbox.

4. A dual motor dual adjustment damping force device according to claim 1, characterized by: A pressure regulating valve inner cover installed at the tail of the pressure regulating valve seat is provided between the pressure regulating valve seat and the oil circuit volume regulating assembly. The pressure regulating valve inner cover has a through first oil passage hole, a second oil passage hole and a third oil passage hole. The two ends of the first oil passage hole are respectively connected to the inner cavity of the compression pressure regulating valve and the oil circuit volume regulating assembly. The two ends of the second oil passage hole are respectively connected to the stretching channel and the oil circuit volume regulating assembly. The two ends of the third oil passage hole are respectively connected to the compression channel and the oil circuit volume regulating assembly.

5. The dual-motor dual-adjustment damping force device according to claim 4, characterized in that: The first check valve is installed in the tension channel between the tension adjustment oil passage and the second oil passage, and the second check valve is installed in the compression channel between the compression adjustment oil passage and the third oil passage.

6. The dual-motor dual-adjustment damping force device according to claim 4, characterized in that: The oil circuit volume regulating assembly includes an oil circuit volume regulating chamber fixedly connected to the pressure regulating valve seat. A slide valve is slidably disposed in the middle of the oil circuit volume regulating chamber. The front end of the slide valve is configured as a damping hydraulic oil chamber that communicates with the pressure regulating valve assembly, the tension channel, and the compression channel. The rear end of the slide valve is configured as a sealed gas regulating chamber.

7. The dual-motor dual-adjustment damping force device according to claim 6, characterized in that: The gas regulating chamber is filled with nitrogen gas.

8. The dual-motor dual-adjustment damping force device according to claim 1, characterized in that: A heat insulation plate is provided between the pressure regulating valve seat and the gearbox.

9. The dual-motor dual-adjustment damping force device according to claim 1, characterized in that: The tension channel is connected to the tension oil pipe of the hydraulic damper, and the compression channel is connected to the compression oil pipe of the hydraulic damper.

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