Variable damping double-valve shock absorber

Abstract

The utility model discloses a variable damping double-valve shock absorber, which relates to the technical field of shock absorbers, and comprises a cylinder body, a guider arranged at one end of the cylinder body, a connecting block arranged at the other end of the cylinder body, and a piston assembly arranged in the cylinder body, the cylinder body comprises an inner cylinder, a middle cylinder and an outer cylinder which are sequentially arranged from inside to outside, a gap between the inner cylinder and the middle cylinder forms a transition cavity, a gap between the middle cylinder and the outer cylinder forms an oil storage chamber, and the transition cavity is communicated with the recovery chamber through an inner hole; the transition cavity is in one-way communication with the compression chamber through a recovery channel located on the connecting block, and a one-way valve and a recovery electromagnetic valve are arranged on the recovery channel. The compression chamber is in one-way communication with the transition cavity through a compression channel located on the connecting block, and a one-way valve and a compression electromagnetic valve are arranged on the compression channel. Due to the arrangement of the middle cylinder, connection of the double-valve restoring and compressing oil way and the electromagnetic valve is achieved, and the double-valve restoring and compressing device has the advantages of being lower in cost and simpler in structure.

Description

Technical Field

[0001] This utility model relates to the field of vibration damper technology, and more specifically to the field of variable damping dual-valve vibration damper technology. Background Technology

[0002] Shock absorbers are used to suppress the oscillations caused by the rebound of springs after absorbing shocks, as well as impacts from the road surface. They are widely used in automobiles to accelerate the attenuation of vibrations in the chassis and body, thereby improving the ride comfort of the vehicle. Dual-valve shock absorbers are one type of shock absorber.

[0003] Existing dual-valve control technology has only one path in the compression-reduction path of the damped fluid flow controlled by solenoid valves. One solenoid valve is placed on the compression side and the other on the reduction side. This is a series dual-valve control technology. The adjustment of both solenoid valves will affect the damping of the path, and decoupled adjustment of compression and reduction cannot be achieved. Furthermore, the disturbance of one solenoid valve will affect the output damping force value of compression or reduction. During the control process, the current of the two valves needs to be combined, which increases the control difficulty and is not conducive to calibration and matching.

[0004] Patent publication number CN111237377B discloses the following: an adjustable shock absorber and a vehicle having such a shock absorber, comprising: an outer tube, at least one intermediate tube, and an inner tube arranged coaxially with each other; a concentric compensation chamber configured between the outer tube and the intermediate tube for receiving hydraulic fluid and gas; a piston rod having a piston movably arranged in the inner tube and dividing the interior of the inner tube into a first working chamber and a second working chamber; at least one first damping valve and at least one separate second damping valve, wherein these damping valves are arranged on the outer wall, and wherein the first working chamber is fluidly connected to the compensation chamber through the first damping valve to adjust the pressure level, and the second working chamber is fluidly connected to the compensation chamber through the second damping valve to adjust the traction level. In this design, the compression chamber is connected to the liquid storage chamber, and the recovery chamber is also connected to the liquid storage chamber. Compensation in the recovery chamber must be achieved through the liquid storage chamber. The principle is simple, but the structure is difficult to implement. Furthermore, the flow path of this patent is not clearly distinguished, and it is easy to lose the ability to independently adjust the recovery solenoid valve and the compression solenoid valve after the check valve malfunctions. The components of this patent are not highly independent, resulting in high assembly difficulty and manufacturing cost. This patent cannot effectively prevent air from entering the first working chamber (recovery chamber) and adversely affecting the damping force.

[0005] The patent with publication number CN107850165B is an existing dual-valve control technology. Although it achieves decoupled adjustment of recovery and compression in principle, the long axial dimension of the outer tube is not conducive to the assembly of parts outside the damper outer tube. In addition, three isolation devices need to be installed in the inner tube of the damper, namely the isolation sealing device, the bottom valve sealing device, and the air chamber piston, all of which are installed in one tube, making the assembly difficult. Utility Model Content

[0006] The purpose of this invention is to address the problem that existing dual-valve control technology cannot achieve separate adjustment of the compression and recovery strokes. This invention provides a variable damping dual-valve vibration damper. This structure can distinguish and achieve separate adjustment of the vibration damper's compression and recovery strokes, while simultaneously achieving a non-separated oil-gas solution.

[0007] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0008] This utility model provides a variable damping dual-valve shock absorber, including a cylinder body, a guide disposed at one end of the cylinder body, a connecting block disposed at the other end of the cylinder body, and a piston assembly disposed inside the cylinder body. The piston of the piston assembly divides the inside of the cylinder body into a compression chamber and a recovery chamber. The cylinder body includes an inner cylinder, an intermediate cylinder and an outer cylinder arranged sequentially from the inside to the outside. The gap between the inner cylinder and the intermediate cylinder forms a transition chamber, and the gap between the intermediate cylinder and the outer cylinder forms an oil reservoir. The transition chamber and the recovery chamber are connected through an inner hole.

[0009] The transition chamber is unidirectionally connected to the compression chamber via a recovery channel located on the connecting block. The recovery channel is equipped with a check valve and a recovery solenoid valve. The compression chamber is unidirectionally connected to the transition chamber via a compression channel located on the connecting block. The compression channel is equipped with a check valve and a compression solenoid valve.

[0010] Specifically, a transition chamber is formed between the inner cylinder and the intermediate cylinder, and the recovery chamber is connected to the transition chamber. Therefore, the presence of the intermediate cylinder allows the transition chamber and the recovery chamber to flow together, forming a combined recovery chamber. The compression chamber and the combined recovery chamber are independently regulated by compression solenoid valves and recovery solenoid valves, each equipped with a one-way valve. (The one-way valve can be integrated into the compression solenoid valve or the recovery solenoid valve, or located on the compression pipe before or after the compression solenoid valve, or on the recovery pipe before or after the recovery solenoid valve.) The one-way structure on the bottom valve allows changes in the gas volume in the oil reservoir to compensate for changes in the piston rod volume. A connecting block is located on the side of the bottom valve away from the cylinder body. The connecting block, through its orifice configuration, connects the compression stroke, the recovery stroke, and the compression chamber to the oil reservoir. The intermediate cylinder connects the dual-valve recovery and compression oil circuits to the solenoid valves, resulting in lower cost and a simpler structure.

[0011] In one embodiment, the system further includes an oil storage pipeline system connecting the oil storage chamber and the compression chamber, wherein the oil storage chamber, the oil storage pipeline system, and the oil storage chamber form a controllable independent passage.

[0012] The oil storage chamber near the connecting block is connected to the compression chamber via an oil storage pipeline system, enabling one-way liquid inflow and one-way liquid outflow between the oil storage chamber and the compression chamber.

[0013] Specifically, the oil storage pipeline system includes a first oil storage hole, a second oil storage hole, and an oil storage pipeline connecting the first and second oil storage holes. The first oil storage hole is connected to the compression chamber via a pipeline equipped with a one-way valve. In one embodiment, it also includes an oil storage pipeline system, which enables one-way liquid inflow and one-way liquid outflow between the oil storage chamber and the compression chamber on the side of the oil storage chamber near the connecting block.

[0014] Specifically, the oil storage pipeline system includes a first oil storage hole, a second oil storage hole, and an oil storage pipeline connecting the first oil storage hole and the second oil storage hole. The first oil storage hole is connected to the compression chamber through a pipeline equipped with a one-way valve.

[0015] In one embodiment, the inner cylinder, the intermediate cylinder, and the outer cylinder are arranged coaxially. The connecting block has three connecting portions near one end of the cylinder body, and the inner cylinder, intermediate cylinder, and outer cylinder are respectively inserted into the corresponding connecting portions to form a mating connection.

[0016] Specifically, the inner cylinder, intermediate cylinder, and outer cylinder are arranged coaxially. The connecting block has three concentric annular grooves near the cylinder body. The inner cylinder, intermediate cylinder, and outer cylinder are respectively inserted into the corresponding annular grooves and connected by interference fit or welding.

[0017] In one embodiment, the inner cylinder engages with the guide near the piston rod via an over-sealing method;

[0018] The intermediate cylinder is fitted with the guide near the piston rod by interference or clearance sealing.

[0019] In one embodiment, an oil seal is also provided on the outside of the guide. The oil seal is axially contacted and fitted with the guide. The rubber part of the oil seal is deformed by the constriction method to achieve a seal with the guide. After the oil seal and the guide are sealed together, a gas passage with a check valve is formed in the middle. The check valve unidirectionally guides the gas passage from the recovery chamber to the oil storage chamber.

[0020] Specifically, the one-way venting and oil-blocking structure formed by the guide and oil seal facilitates the smooth removal of gas from the oil, reduces the impact of foaming, and achieves stable damping force. A well-designed one-way venting and oil-blocking structure can effectively prevent abnormalities from occurring during the operation of a variable damping force shock absorber.

[0021] In one embodiment, the guide is provided with a first vent hole communicating with the recovery chamber, and the guide is provided with a second vent hole communicating with the oil storage chamber. The first vent hole is connected to the second vent hole through a gas passage with a check valve.

[0022] Specifically, in the normal operating state of the variable damping force shock absorber, when the piston rod is far from the ground relative to the connecting block, and the piston rod moves along the axis towards the guide, the gas in the recovery chamber, due to its lower density, accumulates near the guide and is forced to move by the pressure generated by the movement of the oil. It pushes open the check valve through the first exhaust port and enters the oil reservoir through the second exhaust port, thus avoiding sudden changes in force value when the variable damping force shock absorber moves. At the same time, the extremely small exhaust gap effectively hinders the flow of oil, ensuring the relative stability of the recovery force.

[0023] When the piston rod moves away from the guide along the axis, the pressure in the oil reservoir increases. When the gas passes through the second exhaust port, it is blocked by the check valve to prevent a sudden change in the force value when the damping force variable damper moves.

[0024] In one embodiment, an airbag is provided on the guide located in the oil storage chamber, and the guide is provided with an inflation port for inflating the airbag.

[0025] Specifically, the guide is provided with an air inlet that communicates with the interior of the oil storage chamber, and a ring belt that communicates with the air inlet is provided on the guide located in the oil storage chamber. An air bladder is provided on the ring belt through a locking ring.

[0026] Specifically, a solution is proposed that uses a locking ring to secure the airbag and guide, thereby achieving oil-gas separation, and eliminates the exhaust structure of the guide, achieving sealing through existing stable sealing technology.

[0027] In one embodiment, the guide is provided with an air inlet communicating with the interior of the oil reservoir. An annular separator for dividing the oil reservoir is provided in the oil reservoir. The outer wall of the annular separator is slidably sealed with the inner wall of the oil reservoir, and the inner wall of the annular separator is slidably sealed with the outer wall of the intermediate cylinder. The annular separator includes an inner annular hard layer, soft layers disposed on the inner and outer sides of the hard layer, and smooth layers disposed on the surface of each soft layer.

[0028] Specifically, the hard layer provides the main strength and hardness support; the soft layer absorbs the machining errors and non-flatness of the outer and intermediate cylinders; the smooth layer reduces the coefficient of sliding friction, making the axial movement of the separation parts smoother and avoiding excessive friction that would affect the performance of the vibration damper; the hard layer is suitable for metals, plastics and other materials with high hardness and strength; the soft layer is suitable for other sealing materials such as rubber, plastics and PTFE; the smooth layer is also suitable for materials such as PTFE and plastics.

[0029] In one embodiment, the inner hole opening is located near the guide side and must not be higher than the lowest plane position of the guide.

[0030] In one embodiment, the system further includes a bottom valve and a first sealing gasket and a second sealing gasket disposed on the side of the bottom valve near the connecting block.

[0031] Specifically, the first sealing gasket is a sealing structure used to isolate the compression chamber from the recovery chamber, and the second sealing gasket is a sealing structure used to separate the compression chamber from the liquid storage chamber.

[0032] Compared with patent document CN111237377B, the flow path of this solution is clearly distinguished, avoiding the loss of the recovery and compression solenoid valve's independent adjustment capability after the check valve malfunctions; the components of this solution are more independent in their sub-assemblies, making assembly easier and reducing manufacturing costs; the exhaust structure of this solution can effectively prevent air from entering the first working chamber (recovery chamber) and causing adverse effects on the damping force.

[0033] The beneficial effects of this utility model are as follows:

[0034] 1. A transition chamber is formed between the inner cylinder and the intermediate cylinder. The recovery chamber is connected to the transition chamber. Therefore, the presence of the intermediate cylinder allows the transition chamber and the recovery chamber to flow together to form a combined recovery chamber. The compression chamber and the combined recovery chamber are independently regulated by compression solenoid valves and recovery solenoid valves, each equipped with a one-way valve. The one-way structure on the bottom valve allows changes in the gas volume in the oil reservoir to compensate for changes in the piston rod volume. A connecting block is located on the side of the bottom valve away from the cylinder body. The connecting block connects the compression stroke, the recovery stroke, and the compression chamber and oil reservoir through the setting of the holes. The intermediate cylinder connects the oil circuits for dual-valve recovery and compression to the solenoid valves, resulting in lower cost and a simpler structure.

[0035] 2. In normal operation of the variable damping force shock absorber, the piston rod is far from the ground relative to the connecting block. When the piston rod moves along the axis towards the guide, the gas in the recovery chamber, due to its lower density, accumulates near the guide and is forced to move by the pressure generated by the oil movement. It pushes open the check valve through the first exhaust port and enters the oil reservoir through the second exhaust port, preventing sudden changes in force value when the variable damping force shock absorber moves. At the same time, the extremely small exhaust gap effectively hinders the flow of oil. When the piston rod moves away from the guide along the axis, the pressure in the oil reservoir increases. When the gas passes through the second exhaust port, it is blocked by the check valve, preventing sudden changes in force value when the variable damping force shock absorber moves.

[0036] 3. The check valve is composed of a complete solenoid valve (compression solenoid valve, reset solenoid valve) with independent adjustment capability.

[0037] 4. The first sealing gasket is a sealing structure used to isolate the compression chamber from the recovery chamber, and the second sealing gasket is a sealing structure used to seal the compression chamber from the liquid storage chamber. The first sealing gasket and the second sealing gasket are simple and reliable. Attached Figure Description

[0038] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of the appearance structure of this utility model;

[0040] Figure 2 This is a schematic diagram of the exhaust structure formed by the guide and the oil seal.

[0041] Figure 3 yes Figure 2 Schematic diagram of the center guide;

[0042] Figure 4 This is a schematic diagram of the guide with an inflation port and an air bladder;

[0043] Figure 5 This is a schematic diagram of the structure of the guide with an air inlet and an oil reservoir with an annular separator;

[0044] Figure 6 yes Figure 5 Schematic diagram of the middle separator;

[0045] Figure 7 yes Figure 2 A cross-sectional view of the overall structure of this utility model;

[0046] Figure 8 yes Figure 4 A cross-sectional view of the overall structure of this utility model;

[0047] Figure 9 yes Figure 6 A cross-sectional view of the overall structure of this utility model;

[0048] Figure 10 This is a schematic diagram of an oil storage pipeline system.

[0049] Reference numerals: 1-Piston rod, 2-Piston, 3-Bottom valve, 4-Second oil reservoir, 5-Oil reservoir pipe, 6-Connecting block, 7-First oil reservoir, 8-Compression chamber, 9-Recovery chamber, 10-Oil reservoir, 11-Inner cylinder, 12-Intermediate cylinder, 13-Outer cylinder, 14-Inner bore, 15-Compression solenoid valve, 16-Recovery solenoid valve, 17-First check valve, 18-Second check valve, 19-Guide, 191-First exhaust port, 192-Second exhaust port, 20-Inflation port, 21-Ring belt, 22-Air bladder, 23-Oil seal, 24-Check valve, 25-Annular separator. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0051] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0052] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0053] In the description of the embodiments of this utility model, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0054] Example 1

[0055] like Figures 1 to 10 As shown, this embodiment provides the following: Figures 1 to 10 As shown, this embodiment provides a variable damping dual-valve shock absorber, including a cylinder body, a guide 19 disposed at one end of the cylinder body, a connecting block 6 disposed at the other end of the cylinder body, and a piston 2 assembly disposed inside the cylinder body. The piston 2 of the piston 2 assembly divides the inside of the cylinder body into a compression chamber 8 and a recovery chamber 9. The cylinder body includes an inner cylinder 11, an intermediate cylinder 12 and an outer cylinder 13 arranged sequentially from the inside to the outside. The gap between the inner cylinder 11 and the intermediate cylinder 12 forms a transition chamber, and the gap between the intermediate cylinder 12 and the outer cylinder 13 forms an oil reservoir 10. The transition chamber and the recovery chamber 9 are connected through an inner hole 14.

[0056] The transition chamber is unidirectionally connected to the compression chamber 8 via a recovery channel located on the connecting block 6. The recovery channel is equipped with a one-way valve and a recovery solenoid valve 15. The compression chamber 8 is unidirectionally connected to the transition chamber via a compression channel located on the connecting block 6. The compression channel is equipped with a one-way valve and a compression solenoid valve 16.

[0057] Specifically, the inner cylinder 11 and the intermediate cylinder 12 form a transition chamber, and the recovery chamber 9 is connected to the transition chamber. Therefore, the presence of the intermediate cylinder 12 allows the transition chamber and the recovery chamber 9 to pass through and jointly form the combined recovery chamber 9. The compression chamber 8 and the combined recovery chamber 9 are independently regulated by a compression solenoid valve 16 and a recovery solenoid valve 15, both equipped with one-way valves. (The one-way valve can be integrated into the compression solenoid valve 16 or the recovery solenoid valve 15, or it can be located on the compression pipe before or after the compression solenoid valve 16, or it can be located on the recovery pipe before or after the recovery solenoid valve 15.) The one-way structure on the bottom valve 3 allows the change in gas volume in the oil reservoir 10 to compensate for the change in piston rod 1 volume. A connecting block 6 is provided on the side of the bottom valve 3 away from the cylinder body. The connecting block 6 connects the compression stroke, the recovery stroke, and the compression chamber 8 and the oil reservoir 10 through the setting of the hole. The intermediate cylinder 12 connects the oil circuit of the dual-valve recovery and compression to the solenoid valve, resulting in lower cost and simpler structure.

[0058] Example 2

[0059] like Figure 10 As shown, this embodiment is a further optimization based on embodiment 1, specifically:

[0060] It also includes an oil storage pipeline system 5, through which the oil storage chamber 10 near the connecting block 6 achieves one-way liquid inlet and one-way liquid outlet between the oil storage chamber 10 and the compression chamber 8.

[0061] Specifically, the oil storage pipeline 5 system includes a first oil storage hole 7, a second oil storage hole 4, and an oil storage pipeline 5 connecting the first oil storage hole 7 and the second oil storage hole 4. The first oil storage hole 7 is connected to the compression chamber 8 through a pipeline with a one-way valve.

[0062] Example 3

[0063] This embodiment is a further optimization based on embodiment 2, specifically:

[0064] The inner cylinder 11, the intermediate cylinder 12, and the outer cylinder 13 are arranged coaxially. The connecting block 6 has three concentric annular grooves near the cylinder body. The inner cylinder 11, the intermediate cylinder 12, and the outer cylinder 13 are respectively inserted into the corresponding annular grooves and connected by interference fit or welding.

[0065] The inner cylinder 11 is fitted with the guide 19 on the side near the piston rod 1 by means of interference or clearance sealing;

[0066] The intermediate cylinder 12 is fitted with the guide 19 on the side near the piston rod 1 by means of interference or clearance sealing.

[0067] Example 4

[0068] like Figure 2 and Figure 3 As shown, this embodiment is a further optimization based on embodiment 3, specifically:

[0069] It also includes an oil seal 23 located on the outside of the guide 19. The oil seal 23 is axially contacted and engaged with the guide 19. The rubber structure of the oil seal 23 is deformed by the closing method to achieve a seal with the guide 19. After the oil seal 23 is sealed and connected with the guide 19, a gas passage with a check valve 24 is formed in the middle. The check valve 24 unidirectionally guides the gas passage from the recovery chamber 9 to the oil storage chamber 10.

[0070] Specifically, the one-way venting and oil-blocking structure formed by the guide 19 and the oil seal 23 facilitates the smooth removal of gas from the oil, reduces the impact of foaming, and obtains stable damping force. A good one-way venting and oil-blocking structure can effectively prevent abnormalities from occurring during the operation of the variable damping force shock absorber.

[0071] Example 5

[0072] like Figure 2 , Figure 3 and Figure 7 As shown, this embodiment is a further optimization based on embodiment 4, specifically:

[0073] The guide 19 is provided with a first vent 191 that communicates with the recovery chamber 9, and a second vent 192 that communicates with the oil storage chamber 10. The first vent 191 is connected to the second vent 192 through a gas passage with a check valve 24.

[0074] Specifically, in the normal working state of the variable damping force damper, that is, when the piston rod 1 is far away from the ground relative to the connecting block 6, when the piston rod 1 moves along the axis close to the guide 19, the gas in the recovery chamber 9, due to its lower density, accumulates on the side close to the guide 19 and is forced to move by the pressure generated by the movement of the oil. It pushes open the check valve 24 through the first exhaust port 191 and enters the oil reservoir 10 through the second exhaust port 192, thus avoiding a sudden change in the force value when the variable damping force damper moves. At the same time, the extremely small exhaust gap effectively hinders the flow of oil.

[0075] When the piston rod 1 moves away from the guide 19 along the axis, the pressure in the oil reservoir 10 increases. When the gas passes through the second exhaust port 192, it is blocked by the check valve 24 to prevent a sudden change in the force value when the damping force variable damper moves.

[0076] Example 6

[0077] like Figure 2 This embodiment is a further optimization based on embodiment 4, specifically:

[0078] The inner hole 14 shall not be lower than the lowest plane of the guide 19 and the transition cavity that is close to the connecting block 6.

[0079] It also includes a bottom valve 3 and a first sealing gasket 25 and a second sealing gasket 26 disposed on the side of the bottom valve 3 near the connecting block 6.

[0080] Specifically, the first sealing gasket 25 is a sealing structure used to isolate the compression chamber from the recovery chamber, and the second sealing gasket 26 is a sealing structure used to separate the compression chamber from the liquid storage chamber.

[0081] Example 7

[0082] like Figure 4 and Figure 8 As shown, this embodiment is a further optimization based on any one of Embodiments 1 to 3, specifically:

[0083] The guide is provided with an air inlet that communicates with the interior of the oil storage chamber, and a ring belt that communicates with the air inlet is provided on the guide located in the oil storage chamber. An air bladder is provided on the ring belt through a locking ring.

[0084] Specifically, a locking ring is used to fix the airbag and guide, achieving oil-gas separation, and the exhaust structure of the guide is eliminated, with sealing achieved radially.

[0085] Example 8

[0086] like Figure 5 and Figure 9 As shown, this embodiment is a further optimization based on any one of Embodiments 1 to 3, specifically:

[0087] The guide is provided with an air inlet communicating with the interior of the oil reservoir. An annular separator 25 for dividing the oil reservoir is provided in the oil reservoir. The outer wall of the annular separator 25 is slidably sealed with the inner wall of the oil reservoir, and the inner wall of the annular separator is slidably sealed with the outer wall of the intermediate cylinder. The annular separator 25 includes an inner annular hard layer, soft layers disposed on the inner and outer sides of the hard layer, and smooth layers disposed on the surface of each soft layer.

[0088] Specifically, the hard layer provides the main strength and hardness support; the soft layer absorbs the machining errors and non-flatness of the outer and intermediate cylinders; the smooth layer reduces the coefficient of sliding friction, making the axial movement of the separation parts smoother and avoiding excessive friction that would affect the performance of the vibration damper; the hard layer is suitable for metals, plastics and other materials with high hardness and strength; the soft layer is suitable for other sealing materials such as rubber, plastics and PTFE; the smooth layer is also suitable for materials such as PTFE and plastics.

[0089] Compared with the patent document CN111237377B, the flow path of this solution is clearly distinguished, avoiding the loss of the recovery and independent adjustment capability of the compression solenoid valve 15 after the check valve 24 malfunctions; the components of this solution are more independent in their sub-assemblies, making assembly easier and reducing manufacturing costs; the exhaust structure of this solution can effectively prevent air from entering the first working chamber (recovery chamber 9) and causing adverse effects on the damping force.

Claims

1. A variable damping dual-valve shock absorber, comprising a cylinder, a guide (19) disposed at one end of the cylinder, a connecting block (6) disposed at the other end of the cylinder, and a piston assembly disposed inside the cylinder, wherein the piston (2) of the piston assembly divides the interior of the cylinder into a compression chamber (8) and a recovery chamber (9), characterized in that, The cylinder body includes an inner cylinder (11), an intermediate cylinder (12) and an outer cylinder (13) arranged sequentially from the inside to the outside. The gap between the inner cylinder (11) and the intermediate cylinder (12) forms a transition cavity, and the gap between the intermediate cylinder (12) and the outer cylinder (13) forms an oil reservoir (10). The transition cavity and the recovery chamber (9) are connected through an inner hole (14). The transition chamber is unidirectionally connected to the compression chamber through a recovery channel located on the connecting block (6), and the recovery channel is provided with a one-way valve and a recovery solenoid valve (16); the compression chamber (8) is unidirectionally connected to the transition chamber through a compression channel located on the connecting block (6), and the compression channel is provided with a one-way valve and a compression solenoid valve (15).

2. The variable damping dual-valve vibration damper according to claim 1, characterized in that, It also includes an oil storage pipeline system connecting the oil storage chamber (10) and the compression chamber (8), wherein the oil storage chamber (10), the oil storage pipeline system and the oil storage chamber (10) form a controllable independent passage; The oil storage chamber (10) near the connecting block (6) is connected by an oil storage pipeline system to enable one-way liquid inflow and one-way liquid outflow between the oil storage chamber (10) and the compression chamber (8).

3. The variable damping dual-valve vibration damper according to claim 1, characterized in that, The inner cylinder (11), the intermediate cylinder (12) and the outer cylinder (13) are arranged coaxially. The connecting block (6) has three connecting parts near the cylinder body. The inner cylinder (11), the intermediate cylinder (12) and the outer cylinder (13) are respectively inserted into the corresponding connecting parts to form a fit.

4. A variable damping dual-valve vibration damper according to claim 3, characterized in that, The intermediate cylinder (12) is sealed to the guide (19) on the side near the piston rod (1).

5. A variable damping dual-valve vibration damper according to claim 1, characterized in that, An airbag (22) is provided on the guide (19) located in the oil storage chamber (10), and an inflation port (20) for inflating the airbag (22) is also provided.

6. A variable damping dual-valve vibration damper according to claim 1, characterized in that, An air inlet (20) communicating with the interior of the oil storage chamber (10) is also provided. An annular separator (27) for dividing the oil storage chamber (10) is provided in the oil storage chamber (10). The outer wall of the annular separator (27) is slidably sealed with the inner wall of the oil storage chamber (10), and the inner wall of the annular separator (27) is slidably sealed with the outer wall of the intermediate cylinder (12).

7. A variable damping dual-valve vibration damper according to claim 6, characterized in that, The annular separator (27) includes an inner annular hard layer (251), soft layers (252) disposed on the inner and outer sides of the hard layer, and a smooth layer (253) disposed on the surface of each soft layer.

8. A variable damping dual-valve vibration damper according to claim 1, characterized in that, It also includes a bottom valve (3) and a first sealing gasket (25) and a second sealing gasket (26) disposed on the side of the bottom valve (3) near the connecting block (6).

Images