Double-valve shock absorber and suspension system

Abstract

The invention provides a double-valve shock absorber and a suspension system.The shock absorber comprises a liquid storage barrel and a piston rod, an energy storage device cavity and a working cylinder are arranged in the liquid storage barrel, the interior of the working cylinder is divided into a recovery cavity and a compression cavity through a piston on the piston rod, and a safety valve is arranged on the piston; a bottom valve is arranged on the working cylinder; a rebuilt valve and a compression valve are arranged outside the liquid storage cylinder, the rebuilt valve comprises a first one-way electromagnetic valve and a rebuilt oil cavity, the rebuilt oil cavity is communicated with a rebuilt cavity, the rebuilt oil cavity is communicated with the energy storage device cavity through the first one-way electromagnetic valve, the compression valve comprises a second one-way electromagnetic valve and a compressed oil cavity, and the compressed oil cavity is communicated with the energy storage device cavity. The compressed oil liquid cavity is communicated with the recovery cavity through a second one-way electromagnetic valve, and the recovery oil liquid cavity is communicated with the compressed oil liquid cavity through conveying equipment. Stepless damping adjustment can be achieved, the wheels can be actively lifted, damping can be adjusted in real time according to different driving conditions when a vehicle is applied, the height of a vehicle body is adjustable, and the driving experience is optimized.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle shock absorbers, and in particular to a double-valve shock absorber and a suspension system. Background Art

[0002] Automobile shock absorbers are an important part of the automobile suspension system. Based on the damping effect, they can reduce the vibration and impact of the vehicle when driving on uneven roads, thereby ensuring the stability of the vehicle. The damping and stiffness of traditional automobile shock absorbers cannot be changed once the design is finalized, and the road condition adaptability is poor. With the development of the automobile industry, in order to improve the comfort, handling and stability of the vehicle and optimize the driving experience, the suspension system with adjustable body height is widely used, but the hydraulic shock absorber in the existing suspension system cannot adjust the body height. Summary of the invention

[0003] In order to solve the problems in the background technology and realize a shock absorber capable of steplessly adjusting damping and actively adjusting the height of the vehicle body, the present invention proposes a double-valve shock absorber and suspension system with a simple and reliable structure and no complicated pipelines. The technical solution is as follows: A double-valve shock absorber, comprising a liquid storage cylinder, an accumulator cavity and a working cylinder are arranged in the liquid storage cylinder, a piston rod and a piston are arranged in the working cylinder, one end of the piston rod is connected to the piston, and the other end of the piston rod extends out of the liquid storage cylinder, the piston divides the inside of the working cylinder into a recovery cavity and a compression cavity, a bottom valve for connecting / blocking the accumulator cavity and the compression cavity is arranged on the working cylinder, the compression cavity is located on a side of the piston close to the bottom valve, and a safety valve for connecting / blocking the recovery cavity and the compression cavity is arranged on the piston; A recovery valve and a compression valve are respectively provided outside the liquid storage cylinder, the recovery valve comprises a first one-way solenoid valve and a recovery crude oil chamber, the recovery crude oil chamber is communicated with the recovery chamber, the input end and the output end of the first one-way solenoid valve are respectively connected to the recovery crude oil chamber and the accumulator chamber, when the first one-way solenoid valve is opened, the recovery crude oil chamber and the accumulator chamber are communicated, the compression valve comprises a second one-way solenoid valve and a compression oil chamber, the compression oil chamber is communicated with the accumulator chamber, the input end and the output end of the second one-way solenoid valve are respectively connected to the compression oil chamber and the recovery chamber, when the second one-way solenoid valve is opened, the compression oil chamber and the recovery chamber are communicated, a conveying device is connected between the recovery crude oil chamber and the compression oil chamber, when the conveying device performs a conveying action, the recovery crude oil chamber and the compression oil chamber are communicated. Preferably, the working cylinder is fixed in the liquid storage barrel, and a cavity is formed between the working cylinder and the liquid storage barrel; A sealing ring is provided between the working cylinder and the liquid storage cylinder. The cavity between the working cylinder and the liquid storage cylinder is divided into a liquid storage cavity and the energy storage chamber by the sealing ring. A through hole is provided on the working cylinder. The liquid storage cavity and the recovery cavity are connected through the through hole. The sealing ring is located between the bottom valve and the through hole.

[0004] Preferably, the recovery valve further includes a first liquid through hole and a second liquid through hole, the recovery crude oil liquid chamber is connected with the liquid storage chamber through the first liquid through hole, the output end of the first one-way solenoid valve is connected with the accumulator chamber through the second liquid through hole, and the input end of the first one-way solenoid valve is connected with the recovery crude oil liquid chamber, and when the first one-way solenoid valve is opened, the recovery crude oil liquid chamber and the accumulator chamber are connected.

[0005] Preferably, the compression valve further includes a third liquid hole and a fourth liquid hole, the compression oil chamber is connected to the accumulator chamber through the fourth liquid hole, the output end of the second one-way solenoid valve is connected to the liquid storage chamber through the third liquid hole, and the input end of the second one-way solenoid valve is connected to the compression oil chamber, and when the second one-way solenoid valve is opened, the compression oil chamber and the liquid storage chamber are connected.

[0006] Preferably, the first one-way solenoid valve includes a first one-way valve and a first CDC solenoid valve, one end of the first CDC solenoid valve is connected to the re-oil liquid chamber, the other end of the first CDC solenoid valve is connected to the input end of the first one-way valve, the output end of the first one-way valve is connected to the accumulator chamber, and when the first CDC solenoid valve is opened, the re-oil liquid chamber and the accumulator chamber are connected.

[0007] Preferably, the second one-way solenoid valve includes a second one-way valve and a second CDC solenoid valve, one end of the second CDC solenoid valve is connected to the compression oil chamber, the other end of the second CDC solenoid valve is connected to the input end of the second one-way valve, the output end of the second one-way valve is connected to the restoration chamber, and when the second CDC solenoid valve is opened, the compression oil chamber is connected to the restoration chamber.

[0008] Preferably, a floating piston and a nitrogen chamber are further provided in the liquid storage cylinder, and the accumulator chamber and the nitrogen chamber are separated by the floating piston.

[0009] Preferably, the conveying equipment is a gear pump, the recovery valve is provided with a first gear pump port connected to the recovery oil liquid chamber, the compression valve is provided with a second gear pump port connected to the compression oil liquid chamber, and the gear pump is connected to the first gear pump port and the second gear pump port respectively.

[0010] A suspension system comprises the dual-valve shock absorber according to any one of claims 1 to 7, wherein the suspension system further comprises an active wheel lifting mode, an active wheel lowering mode, a compression damping mode and a restoring damping mode.

[0011] Preferably, the active wheel lifting mode is as follows: the first one-way solenoid valve and the second one-way solenoid valve are normally open, and when the wheel is lifted, the first one-way solenoid valve and the second one-way solenoid valve are energized and closed, the shock absorber oil in the compression chamber enters the accumulator chamber through the bottom valve, and then enters the compression oil chamber from the accumulator chamber, the conveying device conveys the shock absorber oil from the compression oil chamber to the recovery oil chamber, the shock absorber oil enters the recovery chamber from the recovery oil chamber, the pressure in the recovery chamber increases, and the liquid storage cylinder is pushed upward, thereby realizing the wheel lifting; The active wheel lowering mode is as follows: the first one-way solenoid valve and the second one-way solenoid valve are normally open. When the wheel is lowered, the first one-way solenoid valve and the second one-way solenoid valve are powered on and closed, and the shock absorber oil in the recovery chamber enters the recovery oil liquid chamber. The conveying device conveys the shock absorber oil in the recovery oil liquid chamber to the compression oil liquid chamber. The shock absorber oil enters the accumulator chamber from the compression oil liquid chamber, and then flows into the compression chamber through the bottom valve. The pressure in the compression chamber increases, pushing the liquid storage cylinder downward, thereby achieving wheel lowering. The compression damping mode is as follows: the first one-way solenoid valve and the second one-way solenoid valve are normally open, the first one-way solenoid valve and the second one-way solenoid valve are both energized and are respectively in the damping state currently required by the vibration damping system, during compression damping, the piston rod and the piston move downward, the shock absorber oil in the compression chamber enters the accumulator chamber through the bottom valve, and then enters the compression oil chamber from the accumulator chamber, at this time, the second one-way solenoid valve is energized and opened, the opening of the second one-way solenoid valve is adjusted to a suitable size according to the required damping, the shock absorber oil in the compression oil chamber enters the recovery chamber through the second one-way solenoid valve, and at the same time, the shock absorber oil in the compression oil chamber enters the recovery oil chamber through the conveying equipment, and the shock absorber oil then enters the recovery chamber from the recovery oil chamber, so as to realize the compression damping force of the shock absorber; The recovery damping mode is as follows: the first one-way solenoid valve and the second one-way solenoid valve are normally open, the first one-way solenoid valve and the second one-way solenoid valve are both energized and are respectively in the damping state currently required by the vibration reduction system, when the damping is restored, the piston rod and the piston move upward, and the shock absorber oil in the recovery chamber enters the recovery crude oil chamber, at this time, the first one-way solenoid valve is energized and opened, the first one-way solenoid valve is adjusted to a suitable size according to the required damping, the shock absorber oil in the recovery crude oil chamber enters the accumulator chamber through the first one-way solenoid valve, and at the same time, the shock absorber oil in the recovery crude oil chamber enters the compression oil chamber through the conveying equipment, and the shock absorber oil then enters the accumulator chamber from the compression oil chamber, and enters the compression chamber through the bottom valve, so as to realize the recovery damping force of the shock absorber.

[0012] The beneficial effects of the present invention are as follows: the present invention provides a shock absorber that can achieve stepless damping adjustment and can actively raise and lower wheels. The application of the present invention can realize real-time damping adjustment of the vehicle according to different driving conditions, improve the driving comfort and controllability of the vehicle, and the vehicle body height can be adjusted, further optimizing the driving experience.

[0013] The present invention is provided with two electromagnetic valves, a restoring valve and a compression valve. The two electromagnetic valves can separately adjust the restoring damping force and the compression damping force, so that the damping adjustment is more controllable and the vibration reduction effect is further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 Schematic diagram of the recovery valve structure of the present invention.

[0015] Numbers in the figure: 1, piston rod; 2, liquid storage cylinder; 3, through hole; 4, recovery chamber; 5, working cylinder; 6, safety valve; 7, piston; 8, sealing ring; 9, third liquid hole; 10, second one-way valve; 11, second CDC solenoid valve; 12, second gear pump port; 13, fourth liquid hole; 14, bottom valve; 15, floating piston; 16, nitrogen chamber; 17, second liquid hole; 18, first gear pump port; 19, first one-way valve; 20, first CDC solenoid valve; 21, first liquid hole; 22, accumulator chamber; 23, compression chamber; 24, guide; 25, tightening nut; 26, valve body; 27, first valve sleeve; 28, second valve sleeve; 29, gear pump; 30, liquid storage chamber; 31, recovery oil chamber; 32, compression oil chamber. DETAILED DESCRIPTION

[0016] In order to make the present invention clearer and more understandable, the technical solution of the present invention is further described in detail below in combination with the accompanying drawings and embodiments. It should be understood that the given embodiment is only one of the implementation methods and does not represent all embodiments.

[0017] In this article, the terms "inside, outside, up, down" and so on are established based on the positional relationship shown in the drawings. Depending on the different drawings, the corresponding positional relationship may also change accordingly. Therefore, they cannot be understood as an absolute limitation on the scope of protection.

[0018] Combined with Figure 1 and attached Figure 2A double valve shock absorber comprises a liquid storage cylinder 2, a working cylinder 5 is fixed in the liquid storage cylinder 2, a distance is maintained between the working cylinder 5 and the liquid storage cylinder 2, the distance between the working cylinder 5 and the liquid storage cylinder 2 forms an annular cavity, a bottom valve 14 for connecting / blocking an accumulator cavity 22 and a compression cavity 23 is provided at the bottom of the working cylinder 5, a sealing ring 8 is provided between the working cylinder 5 and the liquid storage cylinder 2, a floating piston 15 is provided in the liquid storage cylinder 2 below the working cylinder 5, the internal space of the liquid storage cylinder 2 between the floating piston 15 and the sealing ring 8 forms an accumulator cavity 22, and the floating piston 15 and the storage cylinder 2 are connected to each other. The internal space of the liquid storage cylinder 2 between the bottom walls of the liquid cylinder 2 forms a nitrogen chamber 16, in which high-pressure nitrogen is provided. The floating piston 15 isolates the damping oil and the high-pressure nitrogen in the accumulator chamber 22. Compared with the bladder structure adopted by the traditional shock absorber accumulator, the floating piston 15 structure is simpler. The cavity between the working cylinder 5 and the liquid storage cylinder 2 is divided into a liquid storage chamber 30 and the accumulator chamber 22 by a sealing ring 8. A through hole 3 is provided on the working cylinder 5. The liquid storage chamber 30 and the recovery chamber 4 are connected through the through hole 3. The sealing ring 8 is located between the bottom valve 14 and the through hole 3.

[0019] A piston rod 1 and a piston 7 are provided in the working cylinder 5. One end of the piston rod 1 is slidably arranged in the working cylinder 5 and connected to the piston 7. The other end of the piston rod 1 slides and extends to the outside of the liquid storage cylinder 2. The piston 7 divides the interior of the working cylinder 5 into a recovery chamber 4 and a compression chamber 23. The compression chamber 23 is located on the side of the piston 7 close to the bottom valve 14. A safety valve 6 for connecting / blocking the recovery chamber 4 and the compression chamber 23 is provided on the piston 7. The pressure of the compression chamber 23 and the recovery chamber 4 is limited by switching the safety valve 6.

[0020] A recovery valve and a compression valve are respectively provided outside the liquid storage cylinder 2, and the two valves are relatively located on both sides of the liquid storage cylinder 2. The recovery valve includes a first liquid through hole 21, a second liquid through hole 17, a first one-way solenoid valve and a re-oil crude oil liquid chamber 31. The re-oil crude oil liquid chamber 31 is connected with the liquid storage chamber 30 through the first liquid through hole 21. The first one-way solenoid valve includes a first one-way valve 19 and a first CDC solenoid valve 20. One end of the first CDC solenoid valve 20 is connected with the re-oil crude oil liquid chamber 31, and the other end of the first CDC solenoid valve 20 is connected with the input end of the first one-way valve 19. The output end of the first one-way valve 19 is connected with the accumulator chamber 22 through the second liquid through hole 17. The compression valve includes a third liquid hole 9, a fourth liquid hole 13, a second one-way solenoid valve and a compression oil chamber 32, the compression oil chamber 32 is connected to the accumulator chamber 22 through the fourth liquid hole 13, the second one-way solenoid valve includes a second one-way valve 10 and a second CDC solenoid valve 11, one end of the second CDC solenoid valve 11 is connected to the compression oil chamber 32, the other end of the second CDC solenoid valve 11 is connected to the input end of the second one-way valve 10, and the output end of the second one-way valve 10 is connected to the liquid storage chamber 30 through the third liquid hole 9.

[0021] The recovery crude oil chamber 31 and the compression oil chamber 32 are connected through a conveying device. Specifically, the conveying device is a gear pump 29. The recovery valve is provided with a first gear pump port 18 connected to the recovery crude oil chamber 31. The compression valve is provided with a second gear pump port 12 connected to the compression oil chamber 32. The gear pump 29 is connected to the first gear pump port 18 and the second gear pump port 12 respectively.

[0022] Specifically, the first one-way solenoid valve and the second one-way solenoid valve are normally open. When the first one-way solenoid valve is opened, the re-oil chamber 31 and the accumulator chamber 22 are connected, and the shock absorber oil can flow from the re-oil chamber 31 into the accumulator chamber 22, but cannot flow from the accumulator chamber 22 into the re-oil chamber 31; when the second one-way solenoid valve is opened, the compression oil chamber 32 and the recovery chamber 4 are connected, and the shock absorber oil can flow from the compression oil chamber 32 into the recovery chamber 4, but cannot flow from the recovery chamber 4 into the compression oil chamber 32.

[0023] Specifically, the dual-valve shock absorber includes an active state and a passive state. In the active state, the conveying device performs a conveying action, and the conveying device provides the initial power for the flow of oil. The first one-way solenoid valve and the second one-way solenoid valve are both powered on and closed, the bottom valve 14 is opened, the accumulator chamber 22 and the compression chamber 23 are connected, and the safety valve 6 is closed; In the passive state, the piston rod 1 and the piston 7 move to provide the initial power for the oil flow, the first one-way solenoid valve and the second one-way solenoid valve are both in the open state, the conveying equipment performs the conveying action, the bottom valve 14 is opened, the accumulator chamber 22 and the compression chamber 23 are connected, and the safety valve 6 is closed.

[0024] More specifically, the active state includes an active wheel lifting state and an active wheel lowering state. In the active wheel lifting state, the conveying device conveys the shock absorber oil from the compression oil chamber 32 to the recovery oil chamber 31; In the active wheel lowering state, the conveying device conveys the shock absorber oil from the recovery oil liquid chamber 31 to the compression oil liquid chamber 32 .

[0025] The passive state includes a compression damping state and a restoring damping state. In the compression damping state, the piston rod 1 and the piston 7 move downward, the first one-way solenoid valve is in an open state and maintains the original opening, and the opening of the second one-way solenoid valve is adjusted to a suitable size according to the required damping. By changing the opening of the second one-way solenoid valve, the flow rate of the shock absorber oil in the compression oil chamber 32 when entering the restoring chamber 4 is changed, and the conveying device conveys the shock absorber oil from the compression oil chamber 32 to the restoring oil chamber 31; In the restoring damping state, the piston rod 1 and the piston 7 move upward, the second one-way solenoid valve is in an open state and maintains the original opening, the opening of the first one-way solenoid valve is adjusted to a suitable size according to the required damping, and the flow rate of the shock absorber oil in the restoring crude oil chamber 31 when entering the accumulator chamber 22 is changed by changing the opening of the first one-way solenoid valve, and the conveying equipment conveys the shock absorber oil from the restoring crude oil chamber 31 to the compression oil chamber 32.

[0026] Specifically, the opening and closing and opening size of the first CDC solenoid valve 20 are the opening and closing and opening size of the first one-way solenoid valve, and the first one-way valve 19 ensures the one-way flow of the shock absorber oil; the opening and closing and opening size of the second CDC solenoid valve 11 are the opening and closing and opening size of the second one-way solenoid valve, and the second one-way valve 10 ensures the one-way flow of the shock absorber oil.

[0027] The first one-way valve 19 and the first CDC solenoid valve 20, the second one-way valve 10 and the second CDC solenoid valve 11 are all arranged in series, which can realize secondary adjustment of the damping force. Specifically, the first one-way valve 19 and the second one-way valve 10 both adopt soft valves. When the soft valves are adopted, the flow of oil can flush open the valve plate of the soft valve, and there is no need to realize the opening and closing of the one-way valve through electric control. The first CDC solenoid valve 20 and the second CDC solenoid valve 11 control the size of the solenoid valve hole through PWM (pulse width modulation), that is, control the opening size of the solenoid valve, thereby adjusting the damping force of the shock absorber.

[0028] Specifically, the recovery valve includes a valve body 26, in which a first valve sleeve 27 and a second valve sleeve 28 are fixed in sequence along the axial direction. The valve body 26, the first valve sleeve 27 and the second valve sleeve 28 are coaxially arranged, and an annular recovery crude oil liquid chamber 31 is formed between the outer side walls of the first valve sleeve 27 and the second valve sleeve 28 and the inner wall of the valve body 26. The first liquid hole 21 passes through the valve body 26 and the first valve sleeve 27, and the first liquid hole 21 communicates with the liquid storage chamber 30 and the inside of the first valve sleeve 27. The second liquid hole 17 passes through the valve body 26, and the second liquid hole 17 communicates with the accumulator chamber 22 and the recovery crude oil liquid chamber 31; the first valve sleeve 27 is connected to the second valve sleeve 28 at the junction, and the first valve sleeve 2 A first one-way valve 19 is fixed in the valve body 26, the input end of the first one-way valve 19 is located at one end of the first valve sleeve 27 and the second valve sleeve 28 connected, the output end of the first one-way valve 19 is located at one end of the first valve sleeve 27 close to the first liquid hole 21, the side wall of the second valve sleeve 28 is provided with an opening, a first CDC solenoid valve 20 is fixed in the second valve sleeve 28, one end of the first CDC solenoid valve 20 is located at the connection between the second valve sleeve 28 and the first valve sleeve 27, and the other end of the first CDC solenoid valve 20 is located in the second valve sleeve 28; the first gear pump port 18 is arranged on the side wall of the valve body 26, and is communicated with the re-oil liquid chamber 31, and the gear pump 29 is connected to the first gear pump port 18 through a pipeline.

[0029] The compression valve has the same structural form as the restoring valve. The restoring valve and the compression valve are symmetrical in position. The structures of the restoring valve and the compression valve are symmetrical along the axes of the two valves.

[0030] Specifically, a guide 24 is provided in the liquid storage cylinder 2, and the piston rod 1 is slidably connected to the liquid storage cylinder 2 through the guide 24, and the guide 24 is located at the upper position of the liquid storage cylinder 2. More specifically, one end of the liquid storage cylinder 2 provided with the guide 24 is closed by an end cover, and the end cover is fixedly connected to the liquid storage cylinder 2 by tightening a nut 25. The guide 24 can limit the sliding path of the piston rod 1 and ensure the stability and smoothness of the sliding of the piston rod 1.

[0031] Specifically, the top of the working cylinder 5 is interference fit with the liquid storage cylinder 2 and is fixed by welding.

[0032] A suspension system comprises the dual-valve shock absorber according to any one of claims 1 to 7, wherein the suspension system further comprises an active wheel lifting mode, an active wheel lowering mode, a compression damping mode and a restoring damping mode.

[0033] Specifically, the active wheel lifting mode is as follows: the first one-way solenoid valve and the second one-way solenoid valve are normally open. When the wheel is lifted, the first one-way solenoid valve and the second one-way solenoid valve are powered on and closed, and the shock absorber oil in the compression chamber 23 enters the accumulator chamber 22 through the bottom valve 14, and then enters the compression oil chamber 32 from the accumulator chamber 22. The conveying device conveys the shock absorber oil from the compression oil chamber 32 to the recovery oil chamber 31, and the shock absorber oil enters the recovery chamber 4 from the recovery oil chamber 31. The pressure of the recovery chamber 4 increases, pushing the liquid storage cylinder 2 to move upward, thereby realizing the wheel lifting; More specifically, the active mode is as follows: the first CDC solenoid valve 20 and the second CDC solenoid valve 11 are normally open. When the wheel is lifted, the first CDC solenoid valve 20 and the second CDC solenoid valve 11 are powered on and closed, the shock absorber oil in the compression chamber 23 enters the accumulator chamber 22 through the bottom valve 14, and then enters the compression oil chamber 32 from the accumulator chamber 22 through the fourth liquid hole 13, the gear pump 29 transports the shock absorber oil in the compression oil chamber 32 from the first gear pump port 18 to the recovery oil chamber 31 through the second gear pump port 12, the shock absorber oil enters the liquid storage chamber 30 from the recovery oil chamber 31 through the first liquid hole 21, and then enters the recovery chamber 4 from the liquid storage chamber 30 through the through hole 3, the pressure of the recovery chamber 4 increases, and the liquid storage cylinder 2 is pushed to move upward, thereby realizing the wheel lifting.

[0034] The active wheel lowering mode is as follows: the first one-way solenoid valve and the second one-way solenoid valve are normally open. When the wheel is lowered, the first one-way solenoid valve and the second one-way solenoid valve are powered on and closed, and the shock absorber oil in the recovery chamber 4 enters the recovery crude oil chamber 31. The conveying device conveys the shock absorber oil in the recovery crude oil chamber 31 to the compression oil chamber 32. The shock absorber oil enters the accumulator chamber 22 from the compression oil chamber 32, and then flows into the compression chamber 23 through the bottom valve 14. The pressure in the compression chamber 23 increases, pushing the liquid storage cylinder 2 downward, thereby achieving wheel lowering. More specifically, the active wheel lowering mode is as follows: the first CDC solenoid valve 20 and the second CDC solenoid valve 11 are normally open. When the wheel is lowered, the first CDC solenoid valve 20 and the second CDC solenoid valve 11 are powered on and closed, the shock absorber oil in the recovery chamber 4 enters the liquid storage chamber 30 through the through hole 3, and then enters the recovery oil liquid chamber 31 from the liquid storage chamber 30 through the first liquid hole 21, the gear pump 29 transports the shock absorber oil in the recovery oil liquid chamber 31 from the second gear pump port 12 to the compression oil liquid chamber 32 through the first gear pump port 18, the shock absorber oil enters the accumulator chamber 22 from the compression oil liquid chamber 32 through the fourth liquid hole 13, and then flows into the compression chamber 23 through the bottom valve 14, the pressure in the compression chamber 23 increases, and the liquid storage cylinder 2 is pushed downward, thereby achieving wheel lowering.

[0035] The compression damping mode is as follows: the first one-way solenoid valve and the second one-way solenoid valve are normally open, the first one-way solenoid valve and the second one-way solenoid valve are both energized and are respectively in the damping state currently required by the damping system, during compression damping, the piston rod 1 and the piston 7 move downward, the shock absorber oil in the compression chamber 23 enters the accumulator chamber 22 through the bottom valve 14, and then enters the compression oil chamber 32 from the accumulator chamber 22, at this time, the second one-way solenoid valve is energized and opened, the opening of the second one-way solenoid valve is adjusted to a suitable size according to the required damping, the shock absorber oil in the compression oil chamber 32 enters the recovery chamber 4 through the second one-way solenoid valve, and at the same time, the shock absorber oil in the compression oil chamber 32 enters the recovery oil chamber 31 through the conveying equipment, and the shock absorber oil then enters the recovery oil chamber 4 from the recovery oil chamber 31, so as to realize the compression damping force of the shock absorber; More specifically, the compression damping mode is as follows: the first CDC solenoid valve 20 and the second CDC solenoid valve 11 are normally open, the first CDC solenoid valve 20 and the second CDC solenoid valve 11 are both energized and are respectively in the damping state currently required by the damping system, during compression damping, the piston rod 1 and the piston 7 move downward, the shock absorber oil in the compression chamber 23 enters the accumulator chamber 22 through the bottom valve 14, and then enters the compression oil chamber 32 from the accumulator chamber 22 through the fourth liquid hole 13, at this time, the second CDC solenoid valve 11 is energized to open, and the opening of the second CDC solenoid valve 11 is adjusted to a suitable size according to the required damping (based on According to the algorithm, the size of the CDC solenoid valve opening is changed), the shock absorber oil in the compression oil chamber 32 enters the liquid storage chamber 30 through the second CDC solenoid valve 11, the second one-way valve 10 and the third liquid through hole 9 in sequence, and the shock absorber oil then enters the recovery chamber 4 from the liquid storage chamber 30 through the through hole 3. At the same time, the gear pump 29 transports the shock absorber oil in the compression oil chamber 32 from the first gear pump port 18 to the recovery crude oil chamber 31 through the second gear pump port 12, and the shock absorber oil then enters the liquid storage chamber 30 from the recovery crude oil chamber 31, and then enters the recovery chamber 4 from the liquid storage chamber 30 through the through hole 3, so as to realize the compression damping force of the shock absorber.

[0036] The restoration damping mode is as follows: the first one-way solenoid valve and the second one-way solenoid valve are normally open, the first one-way solenoid valve and the second one-way solenoid valve are both energized and are respectively in the damping state currently required by the damping system, when restoring the damping, the piston rod 1 and the piston 7 move upward, and the shock absorber oil in the restoration chamber 4 enters the restoration crude oil chamber 31, at this time, the first one-way solenoid valve is energized and opened, the first one-way solenoid valve is adjusted to a suitable size according to the required damping, the shock absorber oil in the restoration crude oil chamber 31 enters the accumulator chamber 22 through the first one-way solenoid valve, and at the same time, the shock absorber oil in the restoration crude oil chamber 31 enters the compression oil chamber 32 through the conveying equipment, and the shock absorber oil then enters the accumulator chamber 22 from the compression oil chamber 32, and enters the compression chamber 23 through the bottom valve 14, so as to realize the restoration damping force of the shock absorber; More specifically, the recovery damping mode is as follows: the first CDC solenoid valve 20 and the second CDC solenoid valve 11 are normally open, the first CDC solenoid valve 20 and the second CDC solenoid valve 11 are both energized and are respectively in the damping state currently required by the damping system, when the damping is recovered, the piston rod 1 and the piston 7 move upward, the shock absorber oil in the recovery chamber 4 enters the liquid storage chamber 30 through the through hole 3, and then enters the recovery oil liquid chamber 31 from the liquid storage chamber 30 through the first liquid through hole 21, at this time, the first CDC solenoid valve 20 is energized to open, and the opening of the first CDC solenoid valve 20 is adjusted to according to the required damping. The shock absorber oil in the recovery crude oil chamber 31 sequentially passes through the first CDC solenoid valve 20, the first one-way valve 19 and the second liquid hole 17 into the accumulator chamber 22. At the same time, the gear pump 29 delivers the shock absorber oil in the recovery crude oil chamber 31 from the second gear pump port 12 to the compression oil chamber 32 through the first gear pump port 18. The shock absorber oil then enters the accumulator chamber 22 from the compression oil chamber 32 through the fourth liquid hole 13, and then enters the compression chamber 23 through the bottom valve 14, so as to realize the recovery damping force of the shock absorber.

[0037] While embodiments of the present invention have been shown and described, it will be apparent to those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A dual-valve shock absorber, comprising a liquid storage cylinder (2), wherein the liquid storage cylinder (2) is provided with an accumulator chamber (22) and a working cylinder (5), wherein the working cylinder (5) is provided with a piston rod (1) and a piston (7), wherein one end of the piston rod (1) is connected to the piston (7), and the other end of the piston rod (1) extends outside the liquid storage cylinder (2), characterized in that: The piston (7) divides the interior of the working cylinder (5) into a restoring chamber (4) and a compression chamber (23); the working cylinder (5) is provided with a bottom valve (14) for connecting / blocking the accumulator chamber (22) and the compression chamber (23); the compression chamber (23) is located on a side of the piston (7) close to the bottom valve (14); and the piston (7) is provided with a safety valve (6) for connecting / blocking the restoring chamber (4) and the compression chamber (23); A recovery valve and a compression valve are respectively provided outside the liquid storage cylinder (2), the recovery valve comprising a first one-way solenoid valve and a recovery crude oil liquid chamber (31), the recovery crude oil liquid chamber (31) being in communication with the recovery chamber (4), the input end and the output end of the first one-way solenoid valve being respectively connected to the recovery crude oil liquid chamber (31) and the accumulator chamber (22), when the first one-way solenoid valve is opened, the recovery crude oil liquid chamber (31) and the accumulator chamber (22) are in communication, the compression valve comprising a second one-way solenoid valve and a compression oil liquid chamber ( 32), the compression oil chamber (32) is in communication with the accumulator chamber (22), the input end and the output end of the second one-way solenoid valve are respectively connected to the compression oil chamber (32) and the recovery chamber (4), when the second one-way solenoid valve is opened, the compression oil chamber (32) is in communication with the recovery chamber (4), a conveying device is connected between the recovery oil chamber (31) and the compression oil chamber (32), and when the conveying device performs a conveying action, the recovery oil chamber (31) and the compression oil chamber (32) are in communication.

2. A dual-valve shock absorber according to claim 1, characterized in that: The working cylinder (5) is fixed in the liquid storage cylinder (2), and a cavity is formed between the working cylinder (5) and the liquid storage cylinder (2); A sealing ring (8) is provided between the working cylinder (5) and the liquid storage cylinder (2); the cavity between the working cylinder (5) and the liquid storage cylinder (2) is divided into a liquid storage cavity (30) and the accumulator cavity (22) by the sealing ring (8); a through hole (3) is provided on the working cylinder (5); the liquid storage cavity (30) and the recovery cavity (4) are connected by the through hole (3); and the sealing ring (8) is located between the bottom valve (14) and the through hole (3).

3. A dual-valve shock absorber according to claim 2, characterized in that: The recovery valve further comprises a first liquid through hole (21) and a second liquid through hole (17); the recovery crude oil liquid chamber (31) is connected to the liquid storage chamber (30) via the first liquid through hole (21); the output end of the first one-way solenoid valve is connected to the accumulator chamber (22) via the second liquid through hole (17); and the input end of the first one-way solenoid valve is connected to the recovery crude oil liquid chamber (31).

4. A dual-valve shock absorber according to claim 2, characterized in that: The compression valve further comprises a third liquid hole (9) and a fourth liquid hole (13); the compression oil chamber (32) is connected to the accumulator chamber (22) via the fourth liquid hole (13); the output end of the second one-way solenoid valve is connected to the liquid storage chamber (30) via the third liquid hole (9); and the input end of the second one-way solenoid valve is connected to the compression oil chamber (32).

5. A dual-valve shock absorber according to claim 1 or 3, characterized in that: The first one-way solenoid valve comprises a first one-way valve (19) and a first CDC solenoid valve (20); one end of the first CDC solenoid valve (20) is connected to the re-oil liquid chamber (31); the other end of the first CDC solenoid valve (20) is connected to the input end of the first one-way valve (19); the output end of the first one-way valve (19) is connected to the accumulator chamber (22); when the first CDC solenoid valve (20) is opened, the re-oil liquid chamber (31) and the accumulator chamber (22) are in communication.

6. A dual-valve shock absorber according to claim 1 or 4, characterized in that: The second one-way solenoid valve comprises a second one-way valve (10) and a second CDC solenoid valve (11); one end of the second CDC solenoid valve (11) is connected to the compression oil chamber (32); the other end of the second CDC solenoid valve (11) is connected to the input end of the second one-way valve (10); the output end of the second one-way valve (10) is connected to the recovery chamber (4); when the second CDC solenoid valve (11) is opened, the compression oil chamber (32) is connected to the recovery chamber (4).

7. A dual-valve shock absorber according to claim 1, characterized in that: A floating piston (15) and a nitrogen chamber (16) are also provided in the liquid storage cylinder (2), and the energy storage chamber (22) and the nitrogen chamber (16) are separated by the floating piston (15).

8. A dual-valve shock absorber according to claim 1, characterized in that: The conveying device is a gear pump (29); the recovery valve is provided with a first gear pump port (18) communicating with the recovery oil liquid chamber (31); the compression valve is provided with a second gear pump port (12) communicating with the compression oil liquid chamber (32); and the gear pump (29) is connected to the first gear pump port (18) and the second gear pump port (12), respectively.

9. A suspension system, characterized in that: The dual-valve shock absorber comprises the dual-valve shock absorber as described in any one of claims 1 to 7, wherein the suspension system further comprises an active wheel lifting mode, an active wheel lowering mode, a compression damping mode and a restoring damping mode.

10. A suspension system according to claim 9, characterized in that: The active wheel lifting mode is as follows: the first one-way solenoid valve and the second one-way solenoid valve are normally open; when the wheel is lifted, the first one-way solenoid valve and the second one-way solenoid valve are powered on and closed; the shock absorber oil in the compression chamber (23) enters the energy storage chamber (22) through the bottom valve (14), and then enters the compression oil chamber (32) from the energy storage chamber (22); the conveying device conveys the shock absorber oil from the compression oil chamber (32) to the recovery oil chamber (31); the shock absorber oil enters the recovery chamber (4) from the recovery oil chamber (31); the pressure of the recovery chamber (4) increases, pushing the liquid storage cylinder (2) to move upward, thereby achieving wheel lifting; The active wheel lowering mode is as follows: the first one-way solenoid valve and the second one-way solenoid valve are normally open; when the wheel is lowered, the first one-way solenoid valve and the second one-way solenoid valve are powered on and closed, the shock absorber oil in the recovery chamber (4) enters the recovery oil liquid chamber (31), the conveying device conveys the shock absorber oil in the recovery oil liquid chamber (31) to the compression oil liquid chamber (32), the shock absorber oil enters the accumulator chamber (22) from the compression oil liquid chamber (32), and then flows into the compression chamber (23) through the bottom valve (14), the pressure in the compression chamber (23) increases, pushing the liquid storage cylinder (2) to move downward, thereby achieving wheel lowering; The compression damping mode is as follows: the first one-way solenoid valve and the second one-way solenoid valve are normally open, the first one-way solenoid valve and the second one-way solenoid valve are both energized and respectively in the damping state currently required by the vibration damping system; during compression damping, the piston rod (1) and the piston (7) move downward, the shock absorber oil in the compression chamber (23) enters the energy storage chamber (22) through the bottom valve (14), and then enters the compression oil chamber (32) from the energy storage chamber (22); at this time, the second one-way solenoid valve is energized and opened, the opening of the second one-way solenoid valve is adjusted to a suitable size according to the required damping, the shock absorber oil in the compression oil chamber (32) enters the recovery chamber (4) through the second one-way solenoid valve, and at the same time, the shock absorber oil in the compression oil chamber (32) enters the recovery oil chamber (31) through the conveying equipment, and the shock absorber oil then enters the recovery oil chamber (4) from the recovery oil chamber (31), thereby realizing the compression damping force of the shock absorber; The recovery damping mode is as follows: the first one-way solenoid valve and the second one-way solenoid valve are normally open, the first one-way solenoid valve and the second one-way solenoid valve are both energized and respectively in the damping state currently required by the vibration reduction system; during the recovery damping, the piston rod (1) and the piston (7) move upward, and the shock absorber oil in the recovery chamber (4) enters the recovery crude oil chamber (31); at this time, the first one-way solenoid valve is energized and opened, and the first one-way solenoid valve is adjusted to a suitable size according to the required damping; the shock absorber oil in the recovery crude oil chamber (31) enters the accumulator chamber (22) through the first one-way solenoid valve; at the same time, the shock absorber oil in the recovery crude oil chamber (31) enters the compression oil chamber (32) through the conveying device; the shock absorber oil then enters the accumulator chamber (22) from the compression oil chamber (32), and enters the compression chamber (23) through the bottom valve (14), thereby realizing the recovery damping force of the shock absorber.

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