Variable damping shock absorber and motor vehicle

Abstract

The invention discloses a variable-damping shock absorber and a motor vehicle, and the variable-damping shock absorber comprises a damping tube filled with a damping medium; the piston rod is arranged in the damping tube and does telescopic motion in the axial direction of the damping tube; the working piston is connected with the piston rod and divides the internal space of the damping tube into a first working cavity and a second working cavity, and two damping medium control loops are formed between the first working cavity and the second working cavity; the first electromagnetic valve and the second electromagnetic valve are arranged on the two damping medium control loops respectively, a first one-way valve is arranged at the front end of the first electromagnetic valve, and a second one-way valve is arranged at the front end of the second electromagnetic valve. Damping can be independently adjusted when the damping shock absorber stretches out and draws back, meanwhile, the response time can be obviously shortened through the structure, and vehicle controllability and riding experience are greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of shock absorbers, and in particular to a variable damping shock absorber and a motor vehicle. Background Art

[0002] Shock absorbers are crucial components in a vehicle's suspension system. Their primary function is to reduce vibration and bumps while driving, improving driving comfort and vehicle stability. By connecting the suspension system to the vehicle body, shock absorbers convert road shock and vibration into heat or mechanical energy, mitigating vibrations.

[0003] Some existing damping shock absorbers are implemented using dual valve control technology, such as Figure 1 As shown, since there is only one compression-recovery path for the damping liquid controlled by the solenoid valve, one solenoid valve is arranged on the compression side and the other solenoid valve is arranged on the recovery side, it belongs to the series dual-valve control technology, in which the adjustment of the two solenoid valves will affect the damping of the path, and the decoupling adjustment of compression and recovery cannot be achieved. In addition, the disturbance of one of the solenoid valves will affect the output of the damping force value of compression or recovery. During the control process, the current of the two valves needs to be combined, which will increase the difficulty of control and is not conducive to adjustment and matching. Summary of the Invention

[0004] The purpose of the present invention is to provide a variable damping shock absorber and a motor vehicle to address the above-mentioned shortcomings of existing damping shock absorbers using dual-valve control technology. This solution can realize independent adjustment of the damping when the damping shock absorber is extended and retracted. At the same time, this structure can significantly improve the response time, greatly improving the vehicle's controllability and riding experience.

[0005] The present invention is achieved through the following technical solutions:

[0006] In a first aspect, the present invention provides a variable damping shock absorber, comprising:

[0007] a damping tube, the interior of which is filled with a damping medium;

[0008] A piston rod is disposed in the damping tube and is capable of telescopic movement along the axial direction of the damping tube;

[0009] a working piston connected to the piston rod and dividing the internal space of the damping tube into a first working chamber and a second working chamber, wherein two damping medium control circuits are formed between the first working chamber and the second working chamber;

[0010] The first solenoid valve and the second solenoid valve are arranged in parallel on two damping medium control circuits. The first one-way valve is arranged in series on the circuit controlled by the first solenoid valve, and the second one-way valve is arranged in series on the circuit controlled by the second solenoid valve. The first solenoid valve and the second solenoid valve are directly or indirectly connected to the first working chamber and the second working chamber.

[0011] In some embodiments, the damper tube comprises:

[0012] A working cylinder and an outer cylinder, wherein the outer cylinder is sleeved on the outside of the working cylinder and has a radial gap with the working cylinder, and a communicating hole is provided in the first working chamber of the working cylinder;

[0013] a dual-valve mounting base, one side of which is connected to one end of the damping tube, and the first solenoid valve and the second solenoid valve are mounted on the dual-valve mounting base;

[0014] The working piston is arranged in the working cylinder, and the side of the working piston away from the dual-valve mounting base and the radial gap together form the first working chamber, and the side of the working piston facing the dual-valve mounting base forms the second working chamber.

[0015] In some embodiments, the dual-valve mounting base is provided with a first mounting hole and a second mounting hole separated from each other, the first solenoid valve and the first one-way valve are arranged in the first mounting hole, and a first working chamber A and a first solenoid valve leakage storage chamber are formed, the second solenoid valve and the second one-way valve are arranged in the second mounting hole, and a second working chamber A and a second solenoid valve leakage storage chamber are formed.

[0016] In some embodiments, the dual-valve mounting base is provided with a first working chamber A inlet channel, a first working chamber A leakage channel, a second working chamber A inlet channel, a second working chamber A leakage channel and an oil storage channel, the first working chamber A inlet channel connects the first working chamber with the first working chamber A, the first working chamber A leakage channel connects the first solenoid valve leakage storage chamber with the second working chamber, the second working chamber A inlet channel connects the second working chamber with the second working chamber A, the second working chamber A leakage channel connects the second solenoid valve leakage storage chamber with the first working chamber, and the oil storage channel connects the second working chamber with the liquid storage chamber.

[0017] In some embodiments, an annular boss is provided on the dual-valve mounting base, which is adapted to the radial gap between the working cylinder and the outer tube. The inlet of the first working chamber A and the drain port of the second working chamber A are arranged on the annular boss. The drain port of the first working chamber A, the inlet of the second working chamber A and the mouth of the oil storage channel are arranged in the inner area of the annular boss.

[0018] In some embodiments, a piston valve group is provided on the working piston, and the piston valve group includes a restoring passive valve and a compression second passive valve. The restoring passive valve is used to open during the restoring stroke to allow the damping medium in the first working chamber to flow to the second working chamber, and the compression second passive valve is used to open during the compression stroke to allow the damping medium in the second working chamber to flow to the first working chamber.

[0019] In some embodiments, an air chamber outer cylinder is further included, wherein an air chamber piston is provided in the air chamber outer cylinder, and the air chamber piston separates the air chamber outer cylinder to form the liquid storage cavity and the air chamber.

[0020] In some embodiments, the outer cylinder of the air chamber may be provided on the other side of the dual-valve mounting base and arranged coaxially with the damping tube, the side of the air chamber piston facing the dual-valve mounting base forms a liquid storage cavity, and the other side of the air chamber piston forms an air chamber; or the outer cylinder of the air chamber is arranged on the side wall of the damping tube.

[0021] In some embodiments, a bottom valve assembly is provided at one end of the working cylinder connected to the dual-valve mounting base, and the bottom valve assembly includes a bottom valve seat, a first passive compression valve and a restoration compensation valve. The first passive compression valve is used to open during the compression stroke to allow the damping medium in the second working chamber to flow to the liquid storage chamber through the oil storage channel, and the restoration compensation valve is used to open during the restoration stroke to allow the damping medium in the liquid storage chamber to flow to the second working chamber through the oil storage channel.

[0022] In some embodiments, the bottom valve seat is embedded in the dual-valve mounting base, and a second working chamber annular groove is provided on the end of the bottom valve seat connected to the dual-valve mounting base. The second working chamber annular groove is connected to the first working chamber A drainage channel and the second working chamber A inlet channel, and the other end of the bottom valve seat is provided with a second working chamber drainage hole connected to the second working chamber annular groove.

[0023] In some embodiments, the first one-way valve and the second one-way valve include a valve sleeve, a spring, a valve plate and a valve cover, and the spring, valve plate and valve cover are sequentially sleeved in the seat hole of the valve sleeve. The valve cover is provided with a one-way valve inlet channel, and the damping medium generates pressure on the valve plate through the one-way valve inlet channel to push the spring to compress and realize valve opening.

[0024] In a second aspect, the present invention provides a motor vehicle comprising the variable damping shock absorber according to the first aspect.

[0025] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0026] The present invention forms two damping medium control circuits between the first working chamber and the second working chamber of the shock absorber, and respectively sets a first solenoid valve and a second solenoid valve on the two damping medium control circuits. At the same time, a first one-way valve and a second one-way valve are connected in series at the front ends of the first solenoid valve and the second solenoid valve. In this way, when one of the paths is controlled, the other path cannot flow due to the cut-off effect of the one-way valve. The adjustment of the solenoid valve on the path will not affect the damping force value, thereby achieving independent decoupling adjustment of compression and recovery. Since the generation of damping is directly related to the pressure establishment process, the damping can be established more quickly, improving the response time of the system closed-loop control, thereby breaking through the limitation of the single valve response time of the existing technology. At the same time, there is only one working cylinder, which constructs a shorter oil channel, reduces manufacturing costs, and achieves oil and gas isolation to avoid air emulsification when the oil is agitated. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following briefly introduces the drawings required for use in the examples. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be considered as limiting the scope. A person of ordinary skill in the art can also derive other relevant drawings based on these drawings without inventive effort. In the drawings:

[0028] Figure 1 Schematic diagram of an existing damping shock absorber using dual-valve control technology;

[0029] Figure 2 It is a front view of the variable damping shock absorber in the present invention;

[0030] Figure 3 for Figure 2 AA section diagram in;

[0031] Figure 4 for Figure 2 The stereogram after AA sectioning;

[0032] Figure 5 for Figure 2 BB section diagram in;

[0033] Figure 6 for Figure 5 A partial schematic diagram of the first one-way valve;

[0034] Figure 7 for Figure 5 A partial schematic diagram of the second one-way valve;

[0035] Figure 8 for Figure 2 The three-dimensional drawing of the dual valve mounting base assembly;

[0036] Figure 9 for Figure 8 Explosion diagram of

[0037] Figure 10 for Figure 8 Schematic diagram of C-direction rotation of the dual valve mounting base;

[0038] Figure 11 for Figure 10 Schematic diagram of JJ section;

[0039] Figure 12 for Figure 10 Schematic diagram of HH section in;

[0040] Figure 13 for Figure 3 A partial schematic diagram of the location of the piston valve group and bottom valve assembly.

[0041] Markings and corresponding parts names in the accompanying drawings:

[0042] 1-damping tube, 11-working cylinder, 111-connecting hole, 12-outer cylinder, 13-guide device, 14-oil seal, 15-first working chamber, 16-second working chamber, 2-piston rod, 21-working piston, 211-recovery passive valve, 212-compression second passive valve, 22-buffer spring assembly, 3-dual valve mounting base, 31-first working chamber A, 311-first working chamber A inlet channel, 3111-first working chamber A inlet, 312-first working chamber A leakage channel, 3121-first working chamber A leakage port, 32-first solenoid valve leakage storage chamber, 33-second working chamber A, 331-second working chamber A inlet channel, 3311-second working chamber A inlet, 332-second working chamber A leakage channel , 3321-the second working chamber A leakage port, 34-the second solenoid valve leakage storage chamber, 35-oil storage channel, 41-the first solenoid valve, 411-the first solenoid valve inlet, 412-the first solenoid valve outlet, 42-the second solenoid valve, 421-the second solenoid valve inlet, 422-the second solenoid valve outlet, 51-the first one-way valve, 52-the second one-way valve, 531-the valve sleeve, 532-the spring, 533-the valve plate, 534-the valve cover, 535-the sealing ring, 536-the one-way valve inlet channel, 61-the outer cylinder of the air chamber, 62-the air chamber piston, 63-the liquid storage chamber, 64-the air chamber, 71-the bottom valve seat, 711-the second working chamber ring groove, 712-the second working chamber leakage hole, 72-the compression first passive valve, 73-the recovery compensation valve. DETAILED DESCRIPTION

[0043] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with examples and drawings. The exemplary embodiments of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0045] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0046] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0047] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists, A and B exist at the same time, and B exists. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0048] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0049] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces), unless otherwise clearly and specifically defined.

[0050] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0051] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0052] Example 1

[0053] Please refer to Figure 2-13 , a variable damping shock absorber provided in an embodiment of the present application includes:

[0054] A damping tube 1, the interior of which is filled with a damping medium;

[0055] The piston rod 2 is disposed in the damping tube 1 and is capable of telescopic movement along the axial direction of the damping tube 1;

[0056] A working piston 21 is connected to the piston rod 2 and divides the internal space of the damping tube 1 into a first working chamber 15 and a second working chamber 16. Two damping medium control circuits are formed between the first working chamber 15 and the second working chamber 16.

[0057] The first solenoid valve 41 and the second solenoid valve 42 are respectively provided on two damping medium control circuits, and a first one-way valve 51 is provided at the front end of the first solenoid valve 41 , and a second one-way valve 52 is provided at the front end of the second solenoid valve 42 .

[0058] According to some embodiments of the present application, the damping tube 1 includes:

[0059] The working cylinder 11 and the outer cylinder 12 are sleeved on the outside of the working cylinder 11 with a radial gap between the outer cylinder 12 and the working cylinder 11. The working cylinder 11 is provided with a connecting hole 111 on the side wall near the protruding end of the piston rod to connect the inner and outer sides of the side wall of the working cylinder 11;

[0060] A dual-valve mounting base 3, one side of which is connected to the working cylinder 11 and one end of the outer tube 12, and the first solenoid valve 41 and the second solenoid valve 42 are mounted on the dual-valve mounting base 3;

[0061] The working piston 21 is arranged in the working cylinder 11, and the side of the working piston 21 facing away from the dual-valve mounting base 3 and the radial gap together form the first working chamber 15, and the side of the working piston 21 facing the dual-valve mounting base 3 forms the second working chamber 16.

[0062] According to some embodiments of the present application, an outdoor outer cylinder 61 is provided on the other side of the dual-valve mounting base 3, and the outdoor outer cylinder 61 is coaxially arranged with the outer tube 12. An air chamber piston 62 is provided in the outdoor outer cylinder 61, and the air chamber piston 62 separates the outdoor outer cylinder 61 into a liquid storage chamber 63 and an air chamber 64, and the side of the air chamber piston 62 facing the dual-valve mounting base 3 is the liquid storage chamber 63, and the other side of the air chamber piston 62 is the air chamber 64.

[0063] According to some embodiments of the present application, the dual-valve mounting base 3 is provided with a first mounting hole and a second mounting hole separated from each other, the first solenoid valve 41 and the first one-way valve 51 are arranged in the first mounting hole, and a first working chamber A31 and a first solenoid valve leakage storage chamber 32 are formed, the second solenoid valve 42 and the second one-way valve 52 are arranged in the second mounting hole, and a second working chamber A33 and a second solenoid valve leakage storage chamber 34 are formed.

[0064] Specifically, the axes of the first and second mounting holes are parallel to each other and perpendicular to the axis of the damping tube 1. This arrangement ensures that the axes of the first and second solenoid valves 41, 42 are perpendicular to the axis of the damping tube 1 after installation. In other words, the first and second solenoid valves 41, 42 are radially inserted into the dual-valve mounting base 3 along the damping tube 1. The first working chamber A31 is located at the inlet of the first one-way valve 51. The outlet of the first one-way valve 51 is connected to the first solenoid valve inlet 411, and the first solenoid valve outlet 412 is connected to the first solenoid valve leakage storage chamber 32. The second working chamber A33 is located at the inlet of the second one-way valve 52. The outlet of the second one-way valve 52 is connected to the second solenoid valve inlet 421, and the second solenoid valve outlet 422 is connected to the second solenoid valve leakage storage chamber 34.

[0065] According to some embodiments of the present application, the dual-valve mounting base 3 is provided with a first working chamber A inlet channel 311, a first working chamber A leakage channel 312, a second working chamber A inlet channel 331, a second working chamber A leakage channel 332 and an oil storage channel 35, the first working chamber A inlet channel 311 connects the first working chamber 15 and the first working chamber A31, the first working chamber A leakage channel 312 connects the first solenoid valve leakage storage chamber 32 and the second working chamber 16, the second working chamber A inlet channel 331 connects the second working chamber 16 and the second working chamber A33, the second working chamber A leakage channel 332 connects the second solenoid valve leakage storage chamber 34 and the first working chamber 15, and the oil storage channel 35 connects the second working chamber 16 and the liquid storage chamber 63.

[0066] Specifically, an annular boss is provided on the dual-valve mounting base 3, which is adapted to the radial gap between the working cylinder 11 and the outer tube 12. The first working chamber A inlet 3111 and the second working chamber A drain port 3321 are arranged on the annular boss. The first working chamber A drain port 3121, the second working chamber A inlet 3311 and the mouth of the oil storage channel 35 are arranged in the inner area of the annular boss.

[0067] According to some embodiments of the present application, the working piston 21 is provided with a piston valve assembly, which includes a return passive valve 211 and a compression second passive valve 212. The return passive valve 211 is configured to open during the return stroke to allow the damping medium in the first working chamber 15 to flow into the second working chamber 16, and the compression second passive valve 212 is configured to open during the compression stroke to allow the damping medium in the second working chamber 16 to flow into the first working chamber 15. It should be noted that the structural principles of the return passive valve 211 and the compression second passive valve 212 are conventional and will not be further described here.

[0068] According to some embodiments of the present application, a bottom valve assembly is provided at one end of the working cylinder 11 connected to the dual-valve mounting base 3. The bottom valve assembly includes a bottom valve seat 71, a first compression passive valve 72, and a return compensation valve 73. The first compression passive valve 72 is configured to open during the compression stroke to allow the damping medium in the second working chamber 16 to flow through the oil storage channel 35 to the liquid storage chamber 63. The return compensation valve 73 is configured to open during the return stroke to allow the damping medium in the liquid storage chamber 63 to flow through the oil storage channel 35 to the second working chamber 16. It should be noted that the structural principles of the first compression passive valve 72 and the return compensation valve 73 are conventional and will not be further described herein.

[0069] According to some embodiments of the present application, the bottom valve seat 71 is embedded in the dual-valve mounting base 3, and a second working chamber annular groove 711 is provided on the end of the bottom valve seat 71 connected to the dual-valve mounting base 3, the first working chamber A leakage channel 312 and the second working chamber A inlet channel 331 are connected to the second working chamber annular groove 711, and the other end of the bottom valve seat 71 is provided with a second working chamber leakage hole 712, and the second working chamber leakage hole 712 connects the second working chamber 16 and the second working chamber annular groove 711.

[0070] Specifically, the bottom valve seat 71 is arranged in the inner area of the annular boss on the dual-valve mounting base 3, and the first working chamber A discharge port 3121, the second working chamber A inlet 3311 and the second working chamber annular groove 711 are arranged opposite to each other, so that the first working chamber A discharge channel 312 and the second working chamber A inlet channel 331 are connected to the second working chamber annular groove 711.

[0071] According to some embodiments of the present application, the first one-way valve 51 and the second one-way valve 52 each include a valve sleeve 531, a spring 532, a valve plate 533, a valve cover 534, and a sealing ring 535. The spring 532, valve plate 533, and valve cover 534 are sequentially mounted in the seat hole of the valve sleeve 531. The valve cover 534 is provided with a one-way valve inlet channel 536. The damping medium generates pressure on the valve plate 533 through the one-way valve inlet channel 536, thereby compressing the spring 532 to open the valve. There are two sealing rings 535, one of which is mounted on the outer circle of the valve sleeve 531 to seal the gap between the valve sleeve 531 and the first mounting hole / second mounting hole, thereby forming the first working chamber A31 / second working chamber A33. The other sealing ring 535 is provided on the end surface of the valve sleeve 531 that abuts the first solenoid valve 41 / second solenoid valve 42.

[0072] According to some embodiments of the present application, the working cylinder 11 and the outer tube 12 are provided with a guide device 13 at one end away from the dual-valve mounting base 3. The guide device 13 is annular and has two circular outer peripheral walls, one of which is matingly connected to the inner wall of the working cylinder 11, and the other is matingly connected to the inner wall of the outer tube 12. The center of the guide device 13 has a through hole for the piston rod 2 to pass through, and an oil seal 14 is provided between the through hole and the piston rod 2. It should be noted that the structural principle of the guide device 13 is conventional and will not be further described here.

[0073] According to some embodiments of the present application, the piston rod 2 is provided with a buffer spring assembly 22, which is located within the working cylinder 11 and is used to provide a buffering effect during the return stroke. It should be noted that the structural principle of the buffer spring assembly 22 is conventional technology and will not be further described here.

[0074] The following is a detailed description of the transfer path of the damping medium in the return stroke and compression stroke of the variable damping shock absorber in the embodiment of the present application:

[0075] 1) Restoration stroke, that is, when the piston rod 2 is pulled out:

[0076] 11. A portion of the damping medium passes through the first working chamber 15 → the restoration passive valve 211 → the second working chamber 16;

[0077] 12. Another portion of the damping medium passes through the first working chamber 15 → the first working chamber A inlet 3111 → the first working chamber A inlet channel 311 → the first working chamber A31 → the one-way valve inlet channel 536 → pushes the valve plate 533 and the spring 532 → the first solenoid valve inlet 411 → the first solenoid valve 41 regulation → the first solenoid valve outlet 412 → the first solenoid valve leakage storage chamber 32 → the first working chamber A leakage channel 312 → the first working chamber A leakage port 3121 → the second working chamber annular groove 711 → the second working chamber leakage hole 712 → and returns to the second working chamber 16;

[0078] 13. At the same time, the damping medium passes through the first working chamber 15 → the second working chamber A drain port 3321 → the second working chamber A drain channel 332 → the second solenoid valve drain storage chamber 34 → the second solenoid valve outlet 422 → through the second solenoid valve 42 → the second solenoid valve inlet 421 → the valve plate 533 is cut off;

[0079] 14. At the same time, the damping medium passes through the liquid storage chamber 63 → the liquid storage channel 35 → the restoration compensation valve 73 → the second working chamber 16.

[0080] 2) Compression stroke, that is, when the piston rod 2 is pressed in:

[0081] 21. A portion of the damping medium passes through the second working chamber 16 → compresses the second passive valve 212 → first working chamber 15;

[0082] 22. A portion of the damping medium passes through the second working chamber 16 → compresses the first passive valve 72 → the liquid storage channel 35 → the liquid storage chamber 63;

[0083] 23. A portion of the damping medium passes through the second working chamber 16 → the second working chamber drain hole 712 → the second working chamber annular groove 711 → the second working chamber A inlet 3311 → the second working chamber A inlet channel 331 → the second working chamber A33 → the one-way valve inlet channel 536 → pushes open the valve plate 533 and the spring 532 → the second solenoid valve inlet 421 → the second solenoid valve 42 regulation → the second solenoid valve outlet 422 → the second solenoid valve discharge reservoir 34 → the second working chamber A drain port 3321 → returns to the first working chamber 15;

[0084] 24. At the same time, the damping medium passes through the second working chamber 16 → the first working chamber A discharge port 3121 → the first working chamber A discharge channel 312 → the first solenoid valve discharge storage chamber 32 → the first solenoid valve outlet 412 → through the first solenoid valve 41 → the first solenoid valve inlet 411 → the valve plate 533 is cut off.

[0085] The variable damping shock absorber in the embodiment of the present application is connected to the first mounting hole and the second mounting hole by constructing four openings on the dual-valve mounting base 3, so that two damping medium control circuits can be formed between the first working chamber 15 and the second working chamber 16 (such as the routes 12 and 23 in the above-mentioned damping medium transfer path). The first solenoid valve 41 serves the first working chamber 15, and the second solenoid valve 42 serves the second working chamber 16. A one-way valve is connected in series at the front end of each of the two solenoid valves to achieve decoupling adjustment of the damping in the two movement directions of the shock absorber, thereby improving the adjustability of the product (the existing dual-valve technology generally only opens two ports, and the two ports are a shared channel, which to a certain extent affects the damping adjustment in the movement direction of the shock absorber). At the same time, only one working cylinder is used to construct a shorter oil channel, reducing manufacturing costs, and achieving oil and gas isolation to avoid air emulsification when the oil is agitated.

[0086] In the embodiment of the present application, two damping medium control circuits are formed between the first working chamber 15 and the second working chamber 16 of the shock absorber, and a first solenoid valve 41 and a second solenoid valve 42 are respectively set on the two damping medium control circuits. At the same time, a first one-way valve 51 and a second one-way valve 52 are connected in series at the front ends of the first solenoid valve 41 and the second solenoid valve 42. In this way, when one of the paths is controlled, the other path cannot flow due to the cut-off effect of the one-way valve. The adjustment of the solenoid valve on the path will not affect the damping force value, thereby realizing independent decoupling adjustment of compression and recovery. Since the generation of damping is directly related to the pressure building process, the damping can be established more quickly, and the response time of the closed-loop control of the system is improved, thereby breaking through the limitation of the single-valve response time of the prior art.

[0087] Example 2

[0088] A motor vehicle provided in an embodiment of the present application includes the variable damping shock absorber described in Example 1.

[0089] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A variable damping shock absorber, characterized in that: include: A damping tube (1) is filled with a damping medium; A piston rod (2) is disposed in the damping tube (1) and is capable of telescopic movement along the axial direction of the damping tube (1); a working piston (21) connected to the piston rod (2) and dividing the internal space of the damping tube (1) into a first working chamber (15) and a second working chamber (16), wherein two damping medium control circuits are formed between the first working chamber (15) and the second working chamber (16); A first solenoid valve (41) and a second solenoid valve (42) are arranged in parallel on two damping medium control circuits. A first one-way valve (51) is arranged in series on the circuit controlled by the first solenoid valve (41), and a second one-way valve (52) is arranged in series on the circuit controlled by the second solenoid valve (42). The first solenoid valve (41) and the second solenoid valve (42) are directly or indirectly connected to the first working chamber (15) and the second working chamber (16).

2. The variable damping shock absorber according to claim 1, characterized in that: The damping tube (1) comprises: A working cylinder (11) and an outer cylinder (12), wherein the outer cylinder (12) is sleeved on the outside of the working cylinder (11) and has a radial gap with the working cylinder (11), and a communicating hole (111) is provided in the first working chamber (15) of the working cylinder (11); a double-valve mounting base (3), one side of which is connected to one end of the damping tube (1), and the first solenoid valve (41) and the second solenoid valve (42) are mounted on the double-valve mounting base (3); The working piston (21) is arranged in the working cylinder (11), and the side of the working piston (21) facing away from the dual-valve mounting base (3) and the radial gap together form the first working chamber (15), and the side of the working piston (21) facing the dual-valve mounting base (3) forms the second working chamber (16).

3. The variable damping shock absorber according to claim 2, characterized in that: The dual-valve mounting base (3) is provided with a first mounting hole and a second mounting hole separated from each other, the first solenoid valve (41) and the first one-way valve (51) are arranged in the first mounting hole, and a first working chamber A (31) and a first solenoid valve leakage storage chamber (32) are formed, the second solenoid valve (42) and the second one-way valve (52) are arranged in the second mounting hole, and a second working chamber A (33) and a second solenoid valve leakage storage chamber (34) are formed.

4. The variable damping shock absorber according to claim 3, characterized in that: The dual-valve mounting base (3) is provided with a first working chamber A inlet channel (311), a first working chamber A leakage channel (312), a second working chamber A inlet channel (331), a second working chamber A leakage channel (332) and an oil storage channel (35), wherein the first working chamber A inlet channel (311) connects the first working chamber (15) with the first working chamber A (31), the first working chamber A leakage channel (312) connects the first solenoid valve leakage storage chamber (32) with the second working chamber (16), the second working chamber A inlet channel (331) connects the second working chamber (16) with the second working chamber A (33), the second working chamber A leakage channel (332) connects the second solenoid valve leakage storage chamber (34) with the first working chamber (15), and the oil storage channel (35) connects the second working chamber (16) with the liquid storage chamber (63).

5. The variable damping shock absorber according to claim 4, characterized in that: The double-valve mounting base (3) is provided with an annular boss adapted to the radial gap between the working cylinder (11) and the outer cylinder (12); the first working chamber A inlet (3111) and the second working chamber A drain port (3321) are provided on the annular boss; the first working chamber A drain port (3121), the second working chamber A inlet (3311) and the mouth of the oil storage channel (35) are provided in the inner area of the annular boss.

6. The variable damping shock absorber according to any one of claims 1 to 5, characterized in that: The working piston (21) is provided with a piston valve group, which includes a restoring passive valve (211) and a compression second passive valve (212). The restoring passive valve (211) is used to open in a restoring stroke to allow the damping medium in the first working chamber (15) to flow into the second working chamber (16), and the compression second passive valve (212) is used to open in a compression stroke to allow the damping medium in the second working chamber (16) to flow into the first working chamber (15).

7. The variable damping vibration absorber according to claim 4 or 5, characterized in that: It also includes an air chamber outer cylinder (61), wherein an air chamber piston (62) is provided in the air chamber outer cylinder (61), and the air chamber piston (62) separates the air chamber outer cylinder (61) into the liquid storage cavity (63) and the air chamber (64).

8. The variable damping vibration absorber according to claim 7, characterized in that: The outdoor outer cylinder (61) can be provided on the other side of the dual-valve mounting base (3) and arranged coaxially with the damping tube (1); or the outdoor outer cylinder (61) can be arranged on the side wall of the damping tube (1).

9. The variable damping vibration absorber according to claim 7, characterized in that: A bottom valve assembly is provided at one end of the working cylinder (11) connected to the dual-valve mounting base (3), and the bottom valve assembly includes a bottom valve seat (71), a first compression passive valve (72) and a restoration compensation valve (73). The first compression passive valve (72) is used to open during a compression stroke to allow the damping medium in the second working chamber (16) to flow to the liquid storage chamber (63) through the oil storage channel (35), and the restoration compensation valve (73) is used to open during a restoration stroke to allow the damping medium in the liquid storage chamber (63) to flow to the second working chamber (16) through the oil storage channel (35).

10. The variable damping shock absorber according to claim 9, characterized in that: The bottom valve seat (71) is embedded in the double valve mounting base (3), and a second working chamber annular groove (711) is provided on one end of the bottom valve seat (71) connected to the double valve mounting base (3), and the second working chamber annular groove (711) is connected to the first working chamber A discharge channel (312) and the second working chamber A inlet channel (331), and the other end of the bottom valve seat (71) is provided with a second working chamber discharge hole (712) connected to the second working chamber annular groove (711).

11. The variable damping shock absorber according to any one of claims 1 to 5, characterized in that: The first one-way valve (51) and the second one-way valve (52) include a valve sleeve (531), a spring (532), a valve plate (533) and a valve cover (534). The spring (532), the valve plate (533) and the valve cover (534) are sequentially sleeved in the seat hole of the valve sleeve (531). The valve cover (534) is provided with a one-way valve inlet channel (536). The damping medium generates pressure on the valve plate (533) through the one-way valve inlet channel (536) to push the spring (532) to compress and realize valve opening.

12. A motor vehicle, characterized in that: The invention comprises the variable damping vibration absorber according to any one of claims 1 to 11.

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