A multi-stage electronically controlled damping valve and an electronically controlled shock absorber using the same

Abstract

The present application relates to a kind of multistage electric control damping valve and the electric control shock absorber using the damping valve.The multistage electric control damping valve includes overflow valve assembly, pilot valve assembly and damping valve body, overflow valve assembly includes overflow valve sleeve, overflow valve core and spring, pilot valve assembly includes several high-speed switch valve.Overflow valve and high-speed switch valve are located in the installation cavity of damping valve body, and are sealedly connected with installation cavity.Damping valve body is provided with multiple oil ports, and is provided with oil flow channel inside, and is communicated with the oil inlet and oil outlet of overflow valve, high-speed switch valve.Multistage electric control damping valve is sealedly connected with the damping valve seat on shock absorber, and by controlling the opening and closing of high-speed switch valve, the multistage adjustment of shock absorber damping characteristic can be realized.The oil inlet of the multistage electric control damping valve of the present application is adjacent to the oil outlet of shock absorber rod cavity, cancels the intermediate cavity structure of traditional electric control shock absorber, so that the structure of shock absorber is more compact, and response is more rapid.

Description

TECHNICAL FIELD

[0001] The present application relates to the mechanical technical field, and more particularly to a multi-stage electric control damping valve and an electric control shock absorber using the damping valve. BACKGROUND

[0002] The size of the damping force of the vehicle shock absorber directly determines the operating stability and ride comfort of the chassis suspension, but the operating performance and comfort often contradict the demand for damping force. When the damping force of the shock absorber is large, the operating performance of the automobile suspension is better, but the ride comfort is reduced, which is suitable for situations such as rapid acceleration, rapid braking, sharp turning, and passing through potholed road surfaces, and is conducive to reducing the roll, pitch, and wheel hopping of the vehicle body. When the damping force of the shock absorber is small, the ride comfort of the automobile is improved, but the operating performance is correspondingly reduced, which is suitable for rough mountain roads. An adjustable shock absorber can select the appropriate damping coefficient according to the road conditions, vehicle speed, load, and movement mode, not only can make the wheels and the road surface fit at any time, but also can ensure that the vehicle body is as stable as possible, and achieve the balance of operating performance and comfort, which is the future development direction of vehicle shock absorbers. The core component of the continuous adjustment damping shock absorber of the prior art is a proportional flow valve, which realizes the continuous change of the flow area of the throttle hole through high-precision valve core position control, so as to realize the continuous adjustment of the damping force. Although the continuous damping adjustment technology can obviously improve the suspension performance, such products may produce damping force drift over time, and the processing precision, manufacturing cost, calibration difficulty, and control difficulty are always high.

[0003] For example, the patent with publication number CN109185382A discloses an internal electromagnetic valve type variable damping shock absorber, which comprises a liquid storage cylinder, a working cylinder is arranged in the liquid storage cylinder, a C liquid flow cavity is formed between the liquid storage cylinder and the working cylinder, and a piston rod assembly that can slide relative to the working cylinder is arranged in the working cylinder; the lower end of the liquid storage cylinder is connected with the upper end of the combination fork to form a seal, the outer part of the upper end is provided with an end cover, and the inner part is provided with an oil seal guide assembly; the upper end of the working cylinder is in abutment with the oil seal guide assembly; the piston rod assembly comprises a hollow piston rod, the upper end of the piston rod extends out of the upper end of the liquid storage cylinder, and an internal electromagnetic valve assembly is arranged at the end of the piston rod and connected thereto through a wire; the end of the internal electromagnetic valve assembly is connected with a piston damping valve, and the piston damping valve divides the working cylinder into an A liquid flow cavity and a B liquid flow cavity.

[0004] However, since the variable damping actuator of such a shock absorber is inside the shock absorber, the structure is compact, but it is inconvenient to maintain, and since an internal structure is adopted, the matching precision of the parts and the control precision of the actuator are required to be high, which leads to processing difficulties. Therefore, under the premise of ensuring performance, how to greatly reduce the use cost of the damping adjustable shock absorber and improve the product reliability has become a problem to be solved at present.

[0005] In addition, on the one hand, due to the difference in understanding of the skilled in the art; on the other hand, due to the fact that the applicant has studied a large number of literatures and patents when making the invention, but limited by the size and has not listed all the details and contents, but this is not the invention does not have these prior art characteristics, on the contrary, the invention has all the characteristics of the prior art, and the applicant reserves the right to add relevant prior art in the background art. SUMMARY

[0006] In order to overcome the shortcomings of the prior art, the present application provides a multi-stage electric control damping valve and an electric control shock absorber using the damping valve, which realizes the damping adjustment of the vehicle suspension in a more reliable manner with less cost.

[0007] The present application provides a multi-stage electric control damping valve. The multi-stage electric control damping valve at least comprises a damping valve body. The damping valve body is provided with an overflow valve mounting cavity and a plurality of high-speed switch valve mounting cavities. An oil passage is arranged between the overflow valve mounting cavity and each high-speed switch valve mounting cavity. An oil outlet is arranged in the high-speed switch valve mounting cavity and communicates with the outside of the damping valve body. The oil passage and the oil outlet form at least two parallel pilot oil paths.

[0008] Preferably, the plurality of high-speed switch valve mounting cavities are used to mount high-speed switch valves with different oil passage diameters. The overflow valve mounting cavity is used to mount an overflow valve assembly. The high-speed switch valves control the on-off of the pilot oil paths by keeping open or closed, thereby adjusting the opening difficulty of the overflow valve assembly.

[0009] Preferably, the multi-stage electric control damping valve adjusts the opening difficulty of the overflow valve assembly in series by adjusting the number of open high-speed switch valves to adjust the flow capacity of the pilot oil paths.

[0010] Preferably, the present application adjusts the opening degree of the damping valve by controlling the opening and closing state of the high-speed switch valve to adjust the flow capacity of the pilot oil path, thereby changing the flow efficiency of the damping oil in the damping valve. Preferably, the present application divides the flow efficiency of the damping oil in the damping valve in series by adjusting the number of open high-speed switch valves, thereby expanding the range of damping adjustment.

[0011] According to a preferred embodiment, the multi-stage electric control damping valve further comprises an overflow valve assembly arranged in the overflow valve mounting cavity. Preferably, the overflow valve assembly at least comprises an overflow valve sleeve, an overflow valve core and a spring. Preferably, the overflow valve core is nested inside the overflow valve sleeve, the spring is arranged in the overflow valve mounting cavity, one end of the spring is in contact with the end face of the overflow valve mounting cavity, and the other end of the spring is connected with the overflow valve core.

[0012] The overflow valve assembly allows the shock-absorbing oil to flow through the overflow oil passage by the movement of the overflow valve spool within the overflow valve sleeve, thereby playing a shock-absorbing role.

[0013] According to a preferred embodiment, the high-speed on-off valve mounting cavity penetrates through the damping valve body, and the overflow valve mounting cavity forms a groove on the damping valve body. Preferably, the overflow valve mounting cavity is provided with a mounting groove on the end face within the damping valve body for mounting the spring.

[0014] When the overflow valve assembly is mounted to the overflow valve mounting cavity, the spring is in a compressed state, and the end face of the overflow valve spool abuts against the end face of the overflow valve sleeve cavity under the elastic force of the spring, preventing the oil from flowing out of the overflow valve sleeve, resulting in the failure of the damping valve.

[0015] According to a preferred embodiment, the overflow valve sleeve is partially nested into the overflow valve mounting cavity and partially disposed outside the overflow valve mounting cavity. The overflow valve sleeve is provided with an inner cavity. The inner cavity is configured with an oil inlet at one end of the overflow valve sleeve disposed outside the overflow valve mounting cavity. The one end of the overflow valve sleeve disposed outside the overflow valve mounting cavity is configured with an overflow port penetrating through the side wall of the overflow valve sleeve. The oil inlet and the overflow port are in communication to form an overflow oil passage.

[0016] According to a preferred embodiment, the overflow valve spool is disposed within the cavity of the overflow valve sleeve and can move along the axial direction of the cavity. Preferably, in the absence of oil flow, the end face of the overflow valve spool abuts against the end face of the overflow valve sleeve cavity under the action of the spring, blocking the overflow oil passage.

[0017] According to a preferred embodiment, several high-speed on-off valve mounting cavities are used to mount high-speed on-off valves with different oil passage diameters. The high-speed on-off valves are used to control the opening and closing of the pilot oil passage.

[0018] Preferably, in the case of adjusting the damping, the high-speed on-off valve controls the ease of movement of the shock-absorbing oil to push the overflow valve spool within the overflow valve sleeve by controlling the opening and closing of the pilot oil passage, thereby adjusting the pressure required for the shock-absorbing oil to push the overflow valve spool to allow the shock-absorbing oil to flow through the overflow oil passage, and thereby achieving damping adjustment.

[0019] Preferably, when the pilot oil paths are all cut off by the high-speed switch valves, the back pressure of the overflow valve core increases, that is, the pressure on the pilot oil path side of the overflow valve assembly increases, the pressure difference between the two sides of the overflow valve core decreases, at this time the overflow valve core is not easy to be pushed open by the oil, the oil in the pilot oil path cannot flow, the pressure of the pilot oil path naturally increases, and the damping force of the shock absorber is stronger; when a high-speed switch valve is opened to make a pilot oil path connected, part of the oil in the pilot oil path can flow, the pressure in the pilot oil path is reduced, the pressure difference between the two sides of the overflow valve core increases, at this time the overflow valve core is more likely to be pushed open by the oil, and the damping force of the shock absorber is weaker; when all the high-speed switch valves are opened to make the pilot oil paths all open, the oil in the pilot oil path can flow out easily, the pressure of the pilot oil path naturally decreases to the lowest, and the damping force of the shock absorber is weakest.

[0020] The existing electric control damping valve often adopts a stepless adjustment mode to adjust the flow efficiency of the shock absorbing oil in the damping valve, that is, the existing electric control damping valve often adjusts the size of the shock absorbing oil flow channel by adjusting the opening degree of the valve, so as to adjust the flow efficiency of the shock absorbing oil in the damping valve to realize damping adjustment. This mode not only needs precise current control, but also has high requirements for the machining precision and structural design of the valve. In addition, in the case of long-term use, the data drift caused by the current control of the control unit on the electric control damping valve reduces the reliability of the damping valve, and needs to be calibrated regularly.

[0021] Preferably, the present application sets a plurality of pilot oil paths through the high-speed switch valve, and divides the flow efficiency of the shock absorbing oil in the damping valve into a series based on the number of pilot oil paths, thereby expanding the range of damping adjustment. When adjusting the damping, the present application can adjust the flow efficiency of the shock absorbing oil in the damping valve by adjusting the opening number of the high-speed switch valve. In the process of adjusting the damping, the present application only needs to control the opening and closing state of the high-speed switch valve, so that the drift does not occur even in long-term use, thereby enhancing the reliability of the damping valve.

[0022] The technical scheme of the present application is: a multi-stage electric control damping valve, comprising an overflow valve assembly, a pilot valve assembly and a damping valve body, the overflow valve assembly comprises an overflow valve sleeve, an overflow valve spool and a spring; the pilot valve assembly comprises several high-speed on-off valves; the damping valve body is provided with an overflow valve mounting cavity and several high-speed on-off valve mounting cavities, an oil passing channel is arranged between the overflow valve mounting cavity and each high-speed on-off valve mounting cavity, and an oil outlet communicating with the outside of the damping valve body is arranged in the high-speed on-off valve mounting cavity; a pilot oil path in multiple parallel paths is formed between the oil passing channel and the oil outlet. The overflow valve and the high-speed on-off valve are arranged in the corresponding mounting cavities on the damping valve body and are in sealing connection with the mounting cavities; the high-speed on-off valve is used for controlling the on-off of the pilot oil path. The advantage is that the application uses a high-speed on-off valve as a regulating element, which is low in cost, easy to process, fast in response, strong in anti-pollution ability, long in service life, and high in reliability; the oil inlet of the multi-stage electric control damping valve of the application is adjacent to the oil outlet of the shock absorber rod cavity, the intermediate cavity structure of the traditional electric control shock absorber is cancelled, the structure of the shock absorber is more compact, and the response is more rapid. By arranging different throttle diameters of the high-speed on-off valves, the application can realize significant expansion of the damping adjustment stages with fewer high-speed on-off valves, and realize wide-range damping adjustment.

[0023] According to a preferred embodiment, one of the end faces of the overflow valve sleeve is provided with an oil inlet, and the other end is in the form of an opening; the side face of the overflow valve sleeve is provided with annularly distributed overflow ports, and the inside is provided with a cavity; the diameter of the cavity is greater than the diameter of the oil inlet; an overflow oil path is formed between the oil inlet and the overflow ports.

[0024] According to a preferred embodiment, the overflow valve spool is arranged in the cavity of the overflow valve sleeve and can move along the axis direction of the cavity; an oil passing hole is arranged between the two end faces of the overflow valve spool, and the overflow oil path and the pilot oil path are communicated through the oil passing hole.

[0025] According to a preferred embodiment, the spring is arranged in the overflow valve mounting cavity, one end of the spring is in contact with the end face of the overflow valve mounting cavity, and the other end is in contact with one of the end faces of the overflow valve spool. In the state without oil flow, the other end face of the overflow valve spool is tightly attached to the end face of the cavity under the pressure of the spring, and the overflow oil path is cut off.

[0026] According to a preferred embodiment, the pilot valve comprises several high-speed on-off valves with different oil passing hole diameters, and the high-speed on-off valves are normally open or normally closed.

[0027] An electronically controlled shock absorber comprises the multi-stage electronically controlled damping valve as claimed in any one of the preceding claims, and a damping valve seat, a piston rod, an oil seal, a guide, an outer cylinder, an inner cylinder, a piston valve, a bottom valve, and an eye.

[0028] According to a preferred embodiment, the damping valve seat is arranged between the guide and the inner cylinder through the piston rod and is in sealed connection with the outer cylinder, the inner cylinder and the guide. The piston rod extends through the guide and into the inner cylinder. The inner cylinder is arranged inside the outer cylinder, and a gap between the inner cylinder and the outer cylinder forms an oil storage cavity. The bottom valve is arranged at the bottom of the inner cylinder. The piston valve is connected to the bottom of the piston rod, and the piston valve divides the inner cavity of the inner cylinder into a rod cavity containing the piston rod and a rodless cavity not containing the piston rod.

[0029] According to a preferred embodiment, the multi-stage electronically controlled damping valve is mounted to the electronically controlled shock absorber through the damping valve seat. The damping valve seat is provided with a through hole having a diameter larger than that of the piston rod, and an annular oil passage is formed between the inner wall of the through hole and the piston rod. One end of the annular oil passage is in communication with the rod cavity, and the other end is blocked by the guide.

[0030] According to a preferred embodiment, the damping valve seat is provided with a damping valve mounting cavity for mounting the multi-stage electronically controlled damping valve. A rod cavity oil port is arranged between the damping valve mounting cavity and the annular oil passage. A first oil return hole is arranged at the upper end of the damping valve mounting cavity and is in communication with the damping valve mounting cavity and the upper cavity of the damping valve seat.

[0031] According to a preferred embodiment, the multi-stage electronically controlled damping valve is in sealed connection with the damping valve mounting cavity. The oil inlet is in communication with the rod cavity oil port. The overflow port and the oil outlet are in communication with the first oil return hole.

[0032] According to a preferred embodiment, a second oil return hole is arranged between the upper cavity of the damping valve seat and the oil storage cavity of the shock absorber. Oil sequentially passes through the first oil return hole, the upper cavity of the damping valve seat, the second oil return hole and the oil storage cavity to form an oil return oil path.

[0033] The present application has the following advantages:

[0034] 1. The high-speed on-off valve is used as a regulating element in the present application, which has low cost, easy processing, rapid response, strong anti-pollution ability, long service life, no drift after long-term use, and high reliability.

[0035] 2. The oil inlet of the multi-stage electronically controlled damping valve of the present application is adjacent to the oil outlet of the rod cavity of the shock absorber, which cancels the intermediate cavity structure of the traditional electronically controlled shock absorber, making the structure of the shock absorber more compact and the response more rapid.

[0036] 3. By setting different throttle diameters of high-speed on-off valves, the number of high-speed on-off valves can be reduced to significantly expand the number of damping adjustment stages, and a wide range of damping adjustment can be achieved, such as 2 stages of adjustment by 1 high-speed on-off valve, 4 stages of adjustment by 2 high-speed on-off valves, 8 stages of adjustment by 3 high-speed on-off valves, and so on. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 is a structure sectional view of a multi-stage electric control damping valve using double high-speed on-off valves according to a preferred embodiment of the present application;

[0038] Figure 2 is a structure sectional view of a damping valve body using double high-speed on-off valves according to a preferred embodiment of the present application;

[0039] Figure 3 is a schematic diagram of an overflow valve sleeve according to a preferred embodiment of the present application;

[0040] Figure 4 is a schematic diagram of an overflow valve core according to a preferred embodiment of the present application;

[0041] Figure 5 is a schematic diagram of a high-speed on-off valve according to a preferred embodiment of the present application;

[0042] Figure 6 is a schematic diagram of internal oil flow of a multi-stage electric control damping valve using double high-speed on-off valves according to a preferred embodiment of the present application;

[0043] Figure 7 is a schematic diagram of a multi-stage electric control damping valve using double high-speed on-off valves according to a preferred embodiment of the present application;

[0044] Figure 8 is a structure schematic diagram of an electric control shock absorber using double high-speed on-off valves according to a preferred embodiment of the present application;

[0045] Figure 9 is a front view schematic diagram of an electric control shock absorber using double high-speed on-off valves according to a preferred embodiment of the present application;

[0046] Figure 10 is a side view schematic diagram of an electric control shock absorber using double high-speed on-off valves according to a preferred embodiment of the present application;

[0047] Figure 11 is a structure schematic diagram of a damping valve seat using double high-speed on-off valves according to a preferred embodiment of the present application;

[0048] Figure 12Figure 1 is a schematic diagram of oil flow in a shock absorber using a multi-stage electrically controlled damping valve with double high-speed on-off valves according to a preferred embodiment of the present application.

[0049] List of reference signs

[0050] 100: multi-stage electrically controlled damping valve; 101: damping valve body; 102: overflow valve sleeve; 103: overflow valve spool; 104: spring; 105: pressure plate; 106: high-speed on-off valve; 107: coil; 108: oil inlet; 109: overflow port; 110: damping valve seat; 111: oil outlet; 112: oil passage; 113: overflow valve mounting cavity; 114: high-speed on-off valve mounting cavity; 115: through hole; 116: rod cavity oil port; 117: damping valve mounting cavity; 118: first oil return hole; 119: damping valve seat upper cavity; 120: second oil return hole; 121: oil passage hole; 122: high-speed on-off valve oil outlet; 123: high-speed on-off valve oil inlet; 200: electrically controlled shock absorber; 201: piston rod; 202: oil seal; 203: guide; 204: outer cylinder; 205: inner cylinder; 206: piston valve; 207: bottom valve; 208: ear; 209: rod cavity; 210: rodless cavity; 211: oil storage cavity. DETAILED DESCRIPTION

[0051] The present application will be described in detail below with reference to the accompanying drawings. Figures 1 to 12 A detailed description will be given. Example 1

[0052] The present embodiment provides a multi-stage electrically controlled damping valve. Referring to Figure 1 , preferably, the multi-stage electrically controlled damping valve can include an overflow valve assembly, a pilot valve assembly, and a damping valve body 101. Preferably, the overflow valve assembly includes an overflow valve sleeve 102, an overflow valve spool 103, and a spring 104. Preferably, the pilot valve assembly includes at least one high-speed on-off valve 106. Preferably, two high-speed on-off valves 106 can be provided in the pilot valve assembly in this embodiment. Preferably, the overflow valve assembly and the pilot valve assembly are mounted on the damping valve body 101.

[0053] As shown in Figure 2 , preferably, the damping valve body 101 is provided with an overflow valve mounting cavity 113 for mounting the overflow valve assembly and two high-speed on-off valve mounting cavities 114 for mounting the high-speed on-off valves 106, and the two high-speed on-off valve mounting cavities 114 are arranged on both sides of the overflow valve mounting cavity 113. Preferably, an oil passage 112 is provided between the overflow valve mounting cavity 113 and each high-speed on-off valve mounting cavity 114, and an oil outlet 111 is provided in the high-speed on-off valve mounting cavity 114 to communicate with the outside of the damping valve body 101. Preferably, two pilot oil paths in parallel are formed between the oil passage 112 and the oil outlet 111.

[0054] Referring toFigure 1 and Figure 2 Preferably, the overflow valve assembly and the high-speed on-off valve 106 are arranged in the corresponding installation cavities on the damping valve body 101 and are in sealing connection with the installation cavities.

[0055] Preferably, the overflow valve sleeve 102, the overflow valve spool 103 and the spring 104 are arranged in the overflow valve installation cavity 113. Preferably, the overflow valve spool 103 is nested inside the overflow valve sleeve 102. Preferably, the spring 104 is arranged in the overflow valve installation cavity 113, wherein one end of the spring 104 is in contact with the end face of the overflow valve installation cavity 113 and the other end is in contact with the overflow valve spool 103.

[0056] Referring to Figure 2 Preferably, the high-speed on-off valve installation cavity 114 penetrates the damping valve body 101 and the overflow valve installation cavity 113 is formed as a groove on the damping valve body 101.

[0057] Preferably, the overflow valve installation cavity 113 is provided with an installation groove for installing the spring 104 on the end face in the damping valve body 101.

[0058] Preferably, the oil passage 112 is arranged in the overflow valve installation cavity 113 and connects the high-speed on-off valve installation cavities 114 arranged on both sides of the overflow valve installation cavity 113.

[0059] Referring to Figure 1 and Figure 3, preferably, a part of the overflow valve sleeve 102 is arranged inside the overflow valve mounting cavity 113, and another part is arranged outside the overflow valve mounting cavity 113. Preferably, the overflow valve sleeve 102 can adopt a circular truncated cone structure with a step. Preferably, the overflow valve sleeve 102 can be partially nested into the overflow valve mounting cavity 113 by the way that the step surface is in contact with the surface of the damping valve body 101. Preferably, the overflow valve sleeve 102 is internally provided with a cavity, and the opening diameters of the cavity at both ends of the overflow valve sleeve 102 are different. Preferably, the opening diameter of the cavity at one end of the overflow valve sleeve 102 inside the overflow valve mounting cavity 113 is adapted to the size of the overflow valve spool 103, so that the overflow valve spool 103 can be installed inside the overflow valve sleeve 102. Preferably, the opening diameter of the cavity at the other end of the overflow valve sleeve 102 outside the overflow valve mounting cavity 113 is smaller than the size of the overflow valve spool 103, so as to avoid the overflow valve spool 103 from sliding out of the other end of the overflow valve sleeve 102 outside the overflow valve mounting cavity 113. Preferably, the opening of the cavity at the other end of the overflow valve sleeve 102 outside the overflow valve mounting cavity 113 can also form the oil inlet 108. Preferably, the other end of the overflow valve sleeve 102 outside the overflow valve mounting cavity 113 is provided with an overflow port 109 penetrating through the side wall of the overflow valve sleeve 102, so that part of the liquid entering the cavity of the overflow valve sleeve 102 from the oil inlet 108 can exit the overflow valve sleeve 102 from the side wall of the overflow valve sleeve 102.

[0060] Preferably, one end surface of the overflow valve sleeve 102 is provided with the oil inlet 108, and the other end is in the form of an opening. Preferably, the side surface of the overflow valve sleeve 102 is provided with annularly distributed overflow ports 109, and is internally provided with a circular cavity, preferably, the diameter of the circular cavity is larger than the diameter of the oil inlet 108. Preferably, the oil inlet 108 and the overflow port 109 form an overflow oil passage.

[0061] Referring to Figure 1 and Figure 4 , preferably, the overflow valve spool 103 is arranged in the cavity of the overflow valve sleeve 102, and can move along the axial direction of the cavity. Preferably, one end of the overflow valve spool 103 close to the end surface of the overflow valve mounting cavity 113 is connected with the spring 104 mounted on the end surface of the overflow valve mounting cavity 113, so that the overflow valve spool 103 is in contact with the oil inlet 108 under the action of the spring force of the spring 104. Referring to Figure 3 , preferably, the outer wall of the overflow valve spool 103 is provided with a step, and the step divides the outer wall of the overflow valve spool 103 into a first section with a smaller outer diameter and a second section with a larger outer diameter. Preferably, when the overflow valve spool 103 is in contact with the oil inlet 108 under the action of the spring force of the spring 104, the first section of the outer wall of the overflow valve spool 103 covers the area where the overflow port 109 is located.

[0062] Preferably, the oil overflow hole 121 is arranged between the two end faces of the overflow valve spool 103. Preferably, the oil overflow hole 121 has a diameter much smaller than that of the oil inlet 108, so that most of the oil passing through the oil inlet 108 contacts the end face of the overflow valve spool 103, and a small part of the oil passes through the oil overflow hole 121 into the interior of the overflow valve spool 103, and then flows through the oil passage 112. Preferably, the oil overflow hole 121 has a diameter much smaller than that of the oil inlet 108, so that the contact area of the oil with the overflow valve spool 103 is increased, facilitating the oil to apply force to the overflow valve spool 103 to move the overflow valve spool 103, so that the oil overflow passage is formed between the oil inlet 108 and the oil overflow port 109.

[0063] Preferably, the oil overflow hole 121 connects the oil inlet 108 and the oil passage 112, so that the oil overflow passage and the pilot oil passage are connected.

[0064] Preferably, the overflow valve spool 103 is arranged in the cavity of the overflow valve sleeve 102 and can move along the axis of the cavity.

[0065] Preferably, the oil overflow hole 121 is arranged between the two end faces of the overflow valve spool 103, and the oil overflow hole 121 connects the oil overflow passage and the pilot oil passage. The spring 104 is arranged in the overflow valve mounting cavity 113, one end of the spring 104 contacts the end face of the overflow valve mounting cavity 113, and the other end contacts one of the end faces of the overflow valve spool 103. In the state without oil flow, the other end face of the overflow valve spool 103 is in close contact with the end face of the cavity of the overflow valve sleeve 102 under the pressure of the spring 104, so as to block the oil overflow passage.

[0066] Preferably, the pilot valve assembly can include two high-speed on-off valves 106 with different oil passage diameters, and the two high-speed on-off valves 106 are normally closed. Preferably, the high-speed on-off valve inlet 123 or the high-speed on-off valve outlet 122 of the two high-speed on-off valves 106 have different diameters. Preferably, the high-speed on-off valve 106 is used to control the opening and closing of the pilot oil passage.

[0067] Referring to Figure 5 Preferably, the high-speed on-off valve 106 can include a coil 107, a high-speed on-off valve outlet 122, and a high-speed on-off valve inlet 123. Preferably, the high-speed on-off valve inlet 123 is connected to the oil passage 112, and the high-speed on-off valve outlet 122 is connected to the oil outlet 111.

[0068] Preferably, the high-speed on-off valve 106 is used to control the opening and closing of the high-speed on-off valve outlet 122 and the high-speed on-off valve inlet 123, that is, to control the opening and closing of the pilot oil passage. Preferably, the high-speed on-off valve 106 in this embodiment is a normally closed on-off valve. When the coil 107 is not powered, the high-speed on-off valve 106 is in a closed state, and the valve core inside the on-off valve is pressed against the high-speed on-off valve outlet 122 by the spring inside, cutting off the oil passage between the high-speed on-off valve inlet 123 and the high-speed on-off valve outlet 122, and further cutting off the pilot oil passage. When the coil 107 is powered, the high-speed on-off valve 106 is in an open state, and the valve core inside the high-speed on-off valve 106 is lifted by the electromagnetic force, connecting the oil passage between the high-speed on-off valve inlet 123 and the high-speed on-off valve outlet 122, so that the pilot oil passage is turned on.

[0069] Preferably, the high-speed on-off valve 106 is installed to the damping valve body 101 through the high-speed on-off valve mounting cavity 114. Preferably, the high-speed on-off valve outlet 122 and the high-speed on-off valve inlet 123 are installed to the inside of the high-speed on-off valve mounting cavity 114 through the pressure plate 105. The coil 107 is located outside the high-speed on-off valve mounting cavity 114. Preferably, the pressure plate 105 presses the high-speed on-off valve 106 tightly to avoid leakage of the oil flowing through the high-speed on-off valve 106. In this embodiment, the pressure plate 105 is screw-connected to the damping valve body 101.

[0070] Preferably, the multi-stage electrically controlled damping valve of this embodiment can be applied to a solenoid shock absorber. Most of the prior art solenoid shock absorbers adjust the damping value of the shock absorber by controlling the size of the flow passage of the damping oil inside the solenoid valve. The present application adjusts the opening difficulty of the flow passage of the damping oil by the high-speed on-off valve 106 to achieve the adjustment of the damping value of the shock absorber.

[0071] The prior art method of controlling the size of the flow passage of the damping oil inside the solenoid valve requires precise current control, while this embodiment does not require precise current control, only needs to keep the high-speed on-off valve 106 in two states of opening and closing, and the performance is more reliable. Preferably, this embodiment adjusts the opening difficulty of the flow passage of the damping oil by the high-speed on-off valve 106 to achieve the adjustment of the damping value of the shock absorber. Compared with the method of adjusting the size of the flow passage, the structure of this embodiment is relatively simple and does not require high-precision processing technology.

[0072] Referring to Figure 6, preferably, when oil enters the oil inlet 108, part of the oil overcomes the pressure of the spring 104, pushes open the overflow valve core 103, and flows out from the overflow port 109; the other part of the oil enters the pilot oil passage through the oil passage hole 121. The multi-stage electric control damping valve 100 can adjust the back pressure of the overflow valve core 103, i.e. the difficulty of opening the overflow valve, by controlling the on-off of the high-speed switch valve 106. Specifically, the difficulty of pushing open the overflow valve core 103 by the oil overcoming the pressure of the spring 104.

[0073] Preferably, the back pressure of the overflow valve core 103, i.e. the pressure on the side of the pilot oil passage of the overflow valve assembly. When all the pilot oil passages are cut off by the high-speed switch valve 106, the back pressure of the overflow valve core 103 rises, the pressure difference between the two sides of the overflow valve core 103 decreases, the overflow valve core 103 is not easy to be pushed open by the oil, the oil in the pilot oil passage cannot flow, and the pressure of the pilot oil passage naturally rises, so the damping force of the shock absorber is strong; when one of the high-speed switch valves 106 is opened to connect one of the pilot oil passages, part of the oil in the pilot oil passage can flow, the pressure in the pilot oil passage decreases, the pressure difference between the two sides of the overflow valve core 103 increases, the overflow valve core 103 is more likely to be pushed open by the oil, and the damping force of the shock absorber is weak; when all the high-speed switch valves 106 are opened to connect all the pilot oil passages, the oil in the pilot oil passage can flow easily, the pressure in the pilot oil passage naturally drops to the lowest, and the damping force of the shock absorber is the weakest.

[0074] For example, when both high-speed switch valves are closed, the pilot flow is the smallest, the overflow valve is the most difficult to open, and the damping of the multi-stage electric control damping valve is the largest; when both high-speed switch valves are opened, the pilot flow is the largest, the overflow valve is the easiest to open, and the damping of the multi-stage electric control damping valve is the smallest. When one of the high-speed switch valves is opened, the damping force of the damping valve is between the largest and the smallest.

[0075] Preferably, the packaged multi-stage electric control damping valve 100 is as shown in Figure 7 Preferably, the two coils 107 are arranged in the same plane on one side of the damping valve body 101, and the oil inlet 108, the overflow port 109 and the oil outlet 111 are arranged on the other side of the damping valve body 101. Preferably, the oil inlet 108 is formed as a protrusion on the end face of the damping valve body 101, and a plurality of overflow ports 109 are annularly arranged on the side wall of the protrusion. Preferably, a mounting hole is further arranged on the side of the damping valve body 101 where the oil inlet 108 is arranged. Example 2

[0076] This embodiment is a further improvement of Example 1, and the repeated contents will not be described again.

[0077] This embodiment provides an electric control shock absorber 200 using a multi-stage electric control damping valve. Referring to Figure 8 , Figure 9 and Figure 10Preferably, the electronically controlled shock absorber 200 can include the multi-stage electronically controlled damping valve 100, the damping valve seat 110, the piston rod 201, the oil seal 202, the guide 203, the outer cylinder 204, the inner cylinder 205, the piston valve 206, the bottom valve 207, the lug 208, the rod cavity 209, the rodless cavity 210, and the oil storage cavity 211. Preferably, the oil seal 202 is used to prevent the leakage of the oil and gas inside the shock absorber from the piston rod 201. Preferably, the electronically controlled shock absorber 200 is mounted on the vehicle suspension through the lug 208.

[0078] Preferably, the multi-stage electronically controlled damping valve 100 is mounted to the electronically controlled shock absorber 200 through the damping valve seat 110. Preferably, after the multi-stage electronically controlled damping valve 100 is mounted to the electronically controlled shock absorber 200, the two high-speed on-off valves can be at the same horizontal height.

[0079] The damping valve seat 110 is arranged between the guide 203 and the inner cylinder 205 through the piston rod 201, and is sealingly connected between the outer cylinder 204, the inner cylinder 205, and the guide 203.

[0080] Referring to Figure 11 and Figure 12 , the damping valve seat 110 is provided with a through hole 115 with a diameter larger than the diameter of the piston rod 201, and an annular oil passage is formed between the inner wall of the through hole 115 and the piston rod 201. One end of the annular oil passage is in communication with the rod cavity 209, and the other end is blocked by the guide 203.

[0081] Preferably, the damping valve seat 110 is further provided with a damping valve mounting cavity 117, and a rod cavity oil port 116 is arranged between the annular oil passage and the damping valve mounting cavity 117. The upper end of the damping valve mounting cavity 117 is provided with a first oil return hole 118, and the first oil return hole 118 is in communication with the damping valve mounting cavity 117 and the damping valve seat upper cavity 119.

[0082] The multi-stage electronically controlled damping valve 100 is sealingly connected with the damping valve mounting cavity 117, the oil inlet 108 is in communication with the rod cavity oil port 116, and the overflow port 109 and the oil outlet 111 are in communication with the first oil return hole 118. The second oil return hole 120 is arranged between the damping valve seat upper cavity 119 and the shock absorber oil storage cavity 211, and the oil sequentially passes through the first oil return hole 118, the damping valve seat upper cavity 119, the second oil return hole 120, and the oil storage cavity 211 to form an oil return oil passage. Preferably, the overflow oil passage formed by the oil inlet 108 and the overflow port 109 allows the oil that opens the overflow spool 103 to return to the oil storage cavity 211.

[0083] Preferably, the shock absorber works at least including compression stroke and recovery stroke. Preferably, at the compression stroke, the piston rod 201 moves downward, the oil pressure of the rodless chamber 210 rises, the oil flows through the flow valve on the piston valve 206 into the rod chamber 209. The rod chamber 209 is occupied by the piston rod 201, so the increased volume of the rod chamber 209 is less than the decreased volume of the rodless chamber 210, due to the high opening pressure of the compression valve on the bottom valve 207, a small part of the oil pushes away the compression valve and flows back to the oil storage chamber 211, another part of the oil enters the multi-stage electric control damping valve 100 from the oil inlet 108 through the rod chamber oil port 116, and finally returns to the oil storage chamber 211 through the oil return oil way. The compression valve and the multi-stage electric control damping valve 100 together generate the damping force of the shock absorber in this process.

[0084] Preferably, at the recovery stroke, the piston rod 201 moves upward, the oil pressure of the rod chamber 209 rises, the flow valve on the piston valve 206 closes, part of the oil in the rod chamber 209 pushes away the recovery valve on the piston valve 206 and flows into the rodless chamber 210, another part of the oil enters the multi-stage electric control damping valve 100 from the oil inlet 108 through the rod chamber oil port 116, and finally returns to the oil storage chamber 211 through the oil return oil way. Due to the existence of the piston rod 201, the oil from the rod chamber 209 is not enough to supplement the increased volume of the rodless chamber 210, causing the pressure of the rodless chamber 210 to drop, at this time the oil in the oil storage chamber 211 pushes away the compensation valve on the bottom valve 207 and flows into the rodless chamber 210 to supplement. The recovery valve and the multi-stage electric control damping valve 100 together generate the damping force of the shock absorber in this process.

[0085] Therefore, whether it is recovery or compression stroke, oil passes through the multi-stage electric control damping valve 100, so that the damping force of the shock absorber can be adjusted by controlling the multi-stage electric control damping valve 100.

[0086] The embodiment adjusts the damping force of the shock absorber by controlling the multi-stage electric control damping valve 100. Preferably, the embodiment can adjust the damping force of the shock absorber by controlling the opening and closing state of the high-speed switch valve 106 in the multi-stage electric control damping valve 100 to adjust the opening difficulty of the flow channel of the shock absorbing oil.

[0087] Preferably, the embodiment can achieve significant expansion of the number of damping adjustment stages with fewer high-speed switch valves 106 by setting different orifice diameters of the high-speed switch valves 106, and achieve a wide range of damping adjustment, such as 2 stages of adjustment with 1 high-speed switch valve, 4 stages of adjustment with 2 high-speed switch valves, and 8 stages of adjustment with 3 high-speed switch valves.

[0088] Preferably, the embodiment can set N high-speed switch valves 106, and achieve damping adjustment with a stage number of 2 N .

[0089] Preferably, the multi-stage electric control damping valve 100 can be provided with two high-speed switching valves 106, i.e. a first high-speed switching valve and a second high-speed switching valve, and 4-stage damping force adjustment. Preferably, the throttling diameter of the first high-speed switching valve is larger than that of the second high-speed switching valve.

[0090] Preferably, the damping force of the shock absorber can include a first damping state in which the damping force gradually increases, a second damping state, a third damping state, and a fourth damping state.

[0091] Preferably, when the first high-speed switching valve is open and the second high-speed switching valve is open, the shock absorber is in the first damping state.

[0092] Preferably, when the first high-speed switching valve is open and the second high-speed switching valve is closed, the shock absorber is in the second damping state.

[0093] Preferably, when the first high-speed switching valve is closed and the second high-speed switching valve is open, the shock absorber is in the third damping state.

[0094] Preferably, when the first high-speed switching valve is closed and the second high-speed switching valve is closed, the shock absorber is in the fourth damping state.

[0095] Preferably, the multi-stage electric control damping valve 100 is connected with a control unit, and the control unit can adjust the damping stages of the shock absorber by controlling the switching states of the first high-speed switching valve and the second high-speed switching valve in the multi-stage electric control damping valve 100.

[0096] Preferably, the control unit is connected with sensor signals for detecting road conditions and vehicle conditions. Preferably, the sensors can include cameras, laser radars, etc. for identifying front road condition information. Preferably, the sensors can also include acceleration sensors, vehicle height sensors, etc. for detecting vehicle body states. Preferably, the vehicle body states can include vehicle height, vehicle speed, steering wheel angle, etc. Preferably, the control unit can determine the driver's intention through the vehicle speed, steering wheel angle, etc. Preferably, the control unit can generate control instructions to adjust the switching states of the high-speed switching valves 106 by comprehensively considering the front road condition information, vehicle body states, driver's intention, etc. through preset program algorithms, so as to adjust the damping force of the electric control shock absorber 200, and significantly improve the ride comfort, handling stability and safety of the vehicle.

[0097] The oil inlet 108 of the multi-stage electric control damping valve 100 of the embodiment is adjacent to the rod chamber oil outlet 116 of the shock absorber, and the intermediate cavity structure of the traditional electric control shock absorber is cancelled, so that the structure of the shock absorber is more compact, and the response is more rapid. The high-speed switch valve 106 is used as the adjustment basis in the application, which has low cost, easy processing, rapid response, strong anti-pollution ability, long service life, and high reliability, and will not drift after long-term use. By setting different throttle diameters of the high-speed switch valve 106, the number of high-speed switch valves 106 can be reduced to significantly expand the number of damping adjustment stages, and wide-range damping adjustment can be realized.

[0098] It should be noted that the above specific embodiments are exemplary, and those skilled in the art can think of various solutions under the inspiration of the disclosure of the present application, and these solutions also belong to the disclosed range of the present application and fall within the protection scope of the present application. Those skilled in the art should understand that the specification and drawings of the present application are illustrative and do not constitute a limitation on the claims. The protection scope of the present application is defined by the claims and their equivalents. Throughout the text, the features introduced by "preferably" are only optional ways, and should not be understood as necessarily provided, therefore the applicant reserves the right to abandon or delete the relevant preferred features at any time. The specification of the present application contains multiple inventive concepts, such as "preferably", "according to a preferred embodiment" or "optionally", which means that the corresponding paragraph discloses an independent concept, and the applicant reserves the right to file a divisional application according to each inventive concept.

Claims

1. An electronically controlled shock absorber characterized by comprising: The electric control shock absorber comprises a multi-stage electric control damping valve which is mounted to the electric control shock absorber through a damping valve seat (110); The electric control shock absorber further comprises a piston rod (201), an outer cylinder (204), and an inner cylinder (205) which is arranged inside the outer cylinder (204) and forms an oil storage cavity (211) with the outer cylinder (204); The damping valve seat (110) is provided with a through hole (115) with a diameter larger than that of the piston rod (201), and an annular oil passage is formed between the inner wall of the through hole (115) and the piston rod (201); The multi-stage electric control damping valve comprises a damping valve body (101), an overflow valve assembly, and a pilot valve assembly; The damping valve body (101) is provided with an overflow valve mounting cavity (113) and a plurality of high-speed on-off valve mounting cavities (114), and an oil passing passage (112) is arranged between the overflow valve mounting cavity (113) and each high-speed on-off valve mounting cavity (114); the oil passing passage (112) is arranged in the overflow valve mounting cavity (113) and penetrates through the overflow valve mounting cavity (113) to be connected with the high-speed on-off valve mounting cavities (114) arranged on both sides of the overflow valve mounting cavity (113); and an oil outlet (111) is arranged in the high-speed on-off valve mounting cavities (114) to communicate with the outside of the damping valve body (101); The overflow valve assembly at least comprises an overflow valve sleeve (102), an overflow valve spool (103), and a spring (104), wherein the overflow valve spool (103) is nested in the overflow valve sleeve (102), the spring (104) is arranged in the overflow valve mounting cavity (113), one end of the spring (104) is in contact with the end face of the overflow valve mounting cavity (113), the other end of the spring (104) is connected with the overflow valve spool (103), and an oil passing hole is arranged between the two end faces of the overflow valve spool; At least two parallel pilot oil paths are formed between the oil passing passage (112) and the oil outlet (111), and the oil passing hole (121) communicates the oil inlet (108) with the oil passing passage (112), so that the overflow oil path and the pilot oil path are communicated; The end of the overflow valve sleeve (102) outside the overflow valve mounting cavity (113) is provided with an overflow port (109) penetrating through the side wall of the overflow valve sleeve (102), and the oil inlet (108) and the overflow port (109) are communicated to form an overflow oil path; The damping valve seat (110) is provided with a damping valve mounting cavity (117) for mounting the multi-stage electric control damping valve, a rod cavity oil port (116) is arranged between the damping valve mounting cavity (117) and the annular oil passage, and a first oil return hole (118) is arranged at the upper end of the damping valve mounting cavity (117); and the first oil return hole (118) communicates the damping valve mounting cavity (117) with a damping valve seat upper cavity (119). The oil inlet (108) of the multi-stage electric control damping valve is communicated with the rod cavity oil port (116), and the overflow port (109) and the oil outlet (111) are communicated with the first oil return hole (118); The second oil return hole (120) is arranged between the damping valve seat upper cavity (119) and the oil storage cavity (211), and the oil flows through the first oil return hole (118), the damping valve seat upper cavity (119), the second oil return hole (120) and the oil storage cavity (211) in sequence to form an oil return oil circuit.

2. The electronically controlled shock absorber according to claim 1, characterized by The electric control shock absorber further comprises a guide (203), a piston valve (206) and a bottom valve (208), wherein, The piston rod (201) penetrates through the guide (203) and extends into the inner cylinder (205); The bottom valve (208) is arranged at the bottom of the inner cylinder (205); The piston valve (206) is connected to the bottom of the piston rod (201), and the piston valve (206) divides the inner cavity of the inner cylinder (205) into a rod cavity (209) containing the piston rod (201) and a rodless cavity (210) not containing the piston rod (201).

3. The electronically controlled shock absorber according to claim 2, characterized by One end of the annular oil passage is communicated with the rod cavity (209), and the other end is blocked by the guide (203).

4. The electric control shock absorber according to claim 3, wherein The plurality of high-speed switch valve mounting cavities (114) are used for mounting high-speed switch valves (106) with different oil passage diameters; The overflow valve mounting cavity (113) is used for mounting an overflow valve assembly; The high-speed switch valve (106) controls the opening and closing of the pilot oil circuit by being kept open or closed, thereby adjusting the opening difficulty of the overflow valve assembly.

5. The electronically controlled shock absorber according to claim 4, characterized by The multi-stage electric control damping valve adjusts the opening difficulty of the overflow valve assembly in stages by adjusting the opening number of the high-speed switch valve (106) to adjust the flow through of the pilot oil circuit.

6. The electronically controlled shock absorber according to claim 5, characterized by The high-speed switch valve mounting cavity (114) penetrates through the damping valve body (101), and the overflow valve mounting cavity (113) forms a groove on the damping valve body (101), wherein the overflow valve mounting cavity (113) is provided with a mounting groove for mounting the spring (104) on the end face in the damping valve body (101), and the overflow valve spool (103) is arranged in the cavity of the overflow valve sleeve (102) and can move along the axis direction of the cavity; Wherein, in the absence of oil flow, the overflow valve spool (103) is tightly attached to the end face of the cavity of the overflow valve sleeve (102) under the action of the spring (104), thereby blocking the overflow oil circuit.

7. The electronically controlled shock absorber according to claim 6, characterized by The overflow valve sleeve (102) is partially nested in the overflow valve mounting cavity (113) and partially arranged outside the overflow valve mounting cavity (113); The overflow valve sleeve (102) is provided with an inner cavity, The opening of the inner cavity at one end of the overflow valve sleeve (102) located outside the overflow valve mounting cavity (113) forms an oil inlet (108).

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