External electromagnetic valve double-valve-system structure of CDC shock absorber

Abstract

The external electromagnetic valve double-valve-system structure of the CDC shock absorber comprises a shell, an electromagnetic valve module and a mechanical valve module, the electromagnetic valve module and the mechanical valve module are arranged in the shell, the mechanical valve module is communicated with an oil way of the electromagnetic valve module, and a buffering cavity is formed between the mechanical valve module and the electromagnetic valve module. Wherein the mechanical valve module comprises a fixing screw rod, a stop seat, a valve body and a valve body seat, the stop seat, the valve body and the valve body seat are arranged from top to bottom, the fixing screw rod penetrates through and is fixedly connected with the stop seat, the valve plate seat, the valve body and the valve body seat, the valve body is provided with a plurality of axial through holes around the fixing screw rod, and the axial through holes enable damping oil to flow into the buffer cavity. The damping force range of the shock absorber is further expanded through the two valve structures, more balance points can be obtained between comfort and operation stability, the requirements for damping force under various road conditions are effectively met, and the function of the shock absorber is fully exerted.

Description

Technical Field

[0001] The utility model belongs to the technical field of CDC shock absorbers, and in particular relates to a CDC shock absorber external electromagnetic valve double valve system structure. Background Art

[0002] Currently, the solenoid valves used in shock absorbers on the market are almost all pure solenoid valve structures, that is, the opening of the internal valve core, valve plate, or spring is controlled by the electromagnetic coil, thereby controlling the magnitude of the damping force. The CDC shock absorber's solenoid valve structure achieves adjustable damping force, but it is difficult to take into account the tension and compression damping ratio. Because the solenoid valve must directly withstand the repeated impact of the internal high-pressure oil during the shock absorber's tension and compression process, the tiny and delicate parts inside the solenoid valve cannot meet the requirements of long-term, repeated and rapid operation, and are prone to long-term failure, affecting the function of the shock absorber and even posing a safety hazard. It is necessary to improve the solenoid valve structure of existing CDC shock absorbers. Utility Model Content

[0003] In order to solve the above technical problems, the purpose of the utility model is to provide a CDC shock absorber external solenoid valve dual-valve system structure. Through the two valve structures, the damping force range of the shock absorber is further expanded, more balance points can be achieved between comfort and handling stability, and the demand for damping force under various road conditions can be effectively responded to, so that the function of the shock absorber can be fully exerted.

[0004] In order to achieve the above-mentioned purpose of the utility model, the technical solution adopted by the utility model is as follows:

[0005] The utility model proposes a CDC shock absorber external solenoid valve dual valve system structure, comprising a housing, a solenoid valve module and a mechanical valve module arranged in the housing, the mechanical valve module being in oil communication with the solenoid valve module, and a buffer chamber being formed between the mechanical valve module and the solenoid valve module;

[0006] Among them, the mechanical valve module includes a fixed screw and a stop seat, a valve body and a valve body seat arranged from top to bottom. The fixed screw passes through the stop seat, the valve plate seat, the valve body and the valve body seat and is fixedly connected. The valve body is provided with multiple axial through holes around the fixed screw, and the axial through holes allow the damping oil to flow into the buffer chamber.

[0007] Preferably, the mechanical valve module also includes a valve plate seat, which is located between the stop seat and the valve body. The valve plate seat and the valve body are provided with multiple layers of first valve plates, and the first valve plates are located on the axial through hole. A second valve plate is also provided between the first valve plate and the valve body, and the second valve plate is a slotted valve plate. The oil flows into the buffer chamber through the axial through hole and the slotted valve plate.

[0008] Preferably, the first valve disc comprises three layers, and the diameters of the three layers of the first valve disc increase from top to bottom, with the first valve disc located at the bottom being located above the axial through hole.

[0009] Preferably, the inner cavity of the shell is divided into an upper mounting groove opening upward and a lower mounting groove opening downward, the bottom of the upper mounting groove is connected to the bottom of the lower mounting groove through a connecting hole, the components connecting the shell and the shock absorber, the solenoid valve module and the mechanical valve module are installed in the shell.

[0010] More preferably, the solenoid valve module includes a coil assembly, a valve core assembly and an oil circuit assembly, the valve core assembly is arranged in the coil assembly, and the oil circuit assembly is connected to the valve core assembly.

[0011] More preferably, the coil assembly includes a coil shell and a coil, the coil shell is fixedly arranged in the upper mounting groove of the outer shell, a downward-opening valve core mounting groove is provided in the coil shell for connecting with the valve core assembly, the valve core mounting groove is connected to the connecting hole of the outer shell, and the coil is arranged in the coil shell and is located outside the valve core mounting groove.

[0012] More preferably, the valve core assembly integrally passes through the upper mounting groove and the lower mounting groove of the housing and is connected to the coil assembly;

[0013] The valve core assembly includes a valve core housing, a valve core body, and a valve core base. The valve core housing is installed into the valve core mounting groove of the coil housing from the lower mounting groove upwards. The valve core housing and the valve core mounting groove of the coil housing are interference fit. The valve core housing is provided with a valve core movable groove with an opening facing downward. The valve core body is located in the valve core movable groove. The valve core base is provided at the opening of the valve core movable groove. The bottom end of the valve core body passes through the valve core base.

[0014] More preferably, the valve core assembly further comprises a valve core sleeve, which is interference fitly arranged at the top of the valve core movable groove of the valve core housing, and the top end of the valve core sleeve of the valve core body is clearance fit.

[0015] More preferably, the oil circuit assembly includes a circulation housing and a valve core limiting cover, a circulation valve plate, a circulation valve plate seat, a spring, a spring base and a housing limiting cover arranged in the circulation housing;

[0016] A first flat groove is provided on the top surface of the circulation housing, and a second flat groove is provided on the side surface. The first flat groove is connected to the second flat groove to form a flow channel. The top of the circulation housing is embedded in the lower mounting groove of the shell. The circulation housing and the shell are interference fit. A stepped mounting hole is provided along the axis of the circulation housing. The diameter of the stepped mounting hole increases from top to bottom. The top of the stepped mounting hole is connected to the first flat groove. A plurality of oil through holes are provided radially on the circumferential side surface of the circulation housing. The oil through holes are located below the shell and are connected to the stepped mounting hole.

[0017] The stepped mounting hole is aligned with the valve core movable groove of the valve core housing, the valve core limiting cover is arranged at the top of the stepped mounting hole with clearance fit, the valve core limiting cover is provided with a first through hole along the axis, the valve core limiting cover is provided with a plurality of second through holes around the first through hole, the bottom end of the valve core body is embedded in the first through hole, and the second through holes connect the stepped mounting hole with the first flat groove;

[0018] The circulation valve plate is arranged below the valve core limiting cover, the circulation valve plate seat is arranged below the circulation valve plate, the circulation valve plate seat is provided with a third through hole along the axis, the spring base is arranged below the circulation valve plate seat, the spring base is provided with a spring mounting groove opening upwards, the spring is arranged in the spring mounting groove and is located between the circulation valve plate seat and the spring base, the bottom surface of the spring mounting groove is provided with a fourth through hole along the axis so that the spring mounting groove is connected with the step mounting groove, the bottom surface of the spring base is also provided with a plurality of semicircular grooves, the housing limiting cover is arranged in the step mounting hole with an interference fit, and is located below the spring base, the housing limiting cover is provided with a fifth through hole along the axis, the top surface of the housing limiting cover is also provided with a plurality of semicircular grooves, the semicircular grooves of the spring base and the housing limiting cover correspond to form an oil passage, there is a gap between the spring base and the housing limiting cover, the oil passage is connected with the gap, and the oil passage is also connected with the oil through hole on the side;

[0019] The valve body is fixedly arranged in the circulation housing and is located below the housing limit cover. A buffer chamber is formed between the valve body and the housing limit cover.

[0020] Beneficial effects:

[0021] The mechanical valve module of the utility model itself has the function of adjusting the damping force of the shock absorber. The mechanical valve module cooperates with the solenoid valve module to further expand the damping force range of the shock absorber, and can achieve more balance points between comfort and handling stability, effectively respond to the demand for damping force under various road conditions, and enable the shock absorber to fully play its role. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1Shown is a schematic structural diagram of the utility model;

[0023] Figure 2 Shown is a schematic diagram of the coil assembly;

[0024] Figure 3 Shown is a schematic diagram of the housing;

[0025] Figure 4 Shown is a schematic diagram of the valve core housing and valve core base;

[0026] Figure 5 Shown is a schematic diagram of a flow housing;

[0027] Figure 6 Shown is a schematic diagram of the valve core limit cover and the flow valve seat;

[0028] Figure 7 Shown is a schematic diagram of the spring base and the housing limit cover;

[0029] Figure 8 Shown is a schematic diagram of a mechanical valve module;

[0030] Figure 9 Schematic diagram of the first flow channel and the second flow channel is shown, wherein ① is the first flow channel and ② is the second flow channel;

[0031] Figure 10 The figure shows the damping force corresponding to different actuation speeds of the utility model in the 0A state;

[0032] Figure 11 The figure shows the damping force corresponding to different actuation speeds of the present invention in the 1.6A state.

[0033] Reference numerals: 1-housing, 2-solenoid valve module, 3-mechanical valve module, 4-buffer chamber;

[0034] 11-first O-ring, 12-threaded surface, 13-upper mounting groove, 14-lower mounting groove, 15-connecting hole;

[0035] 21-coil assembly, 211-coil housing, 212-coil, 213-gasket, 214-circlip, 215-valve core mounting groove;

[0036] 22-valve core assembly, 221-valve core housing, 222-valve core body, 223-valve core base, 224-valve core sleeve, 225-second O-ring, 226-valve core movable groove;

[0037] 23- oil circuit assembly, 231- circulation housing, 232- valve core limiting cover, 233- circulation valve plate, 234- circulation valve plate seat, 235- spring, 236- spring base, 237- housing limiting cover, 238- semicircular groove;

[0038] 2311 - oil through hole, 2312 - stepped mounting hole, 2313 - first flat slot, 2314 - second flat slot, 2321 - first through hole, 2322 - second through hole, 2341 - third through hole, 2361 - spring mounting slot, 2362 - fourth through hole, 2371 - fifth through hole;

[0039] 31-valve body, 32-stop seat, 33-valve disc seat, 34-valve body seat, 35-fixing screw, 36-second valve disc, 37-first valve disc, 38-axial through hole. DETAILED DESCRIPTION

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without inventive work.

[0041] As shown in the figure, the present invention proposes a CDC shock absorber external solenoid valve dual-valve system structure, including a housing 1 and a solenoid valve module 2 and a mechanical valve module 3 arranged in the housing 1. The mechanical valve module 3 is connected to the oil circuit of the solenoid valve module 2 to play a buffering and failure protection role. The structure of the present invention is described in detail below.

[0042] As shown in the figure, the inner cavity of the housing 1 is divided into an upwardly opening upper mounting groove 13 and a downwardly opening lower mounting groove 14. The bottom of the upper mounting groove 13 is connected to the bottom of the lower mounting groove 14 through a connecting hole 15. The components connecting the housing 1 to the shock absorber, the solenoid valve module 2, and the mechanical valve module 3 are installed within the housing 1, forming a single unit. The outer surface of the housing 1 is provided with a threaded surface 12 to facilitate fixed connection with the shock absorber. Furthermore, a first O-ring 11 is provided along the outer surface of the housing 1 along the circumference to ensure the sealing performance of the utility model after connection with the shock absorber.

[0043] like Figure 1-11 As shown, the solenoid valve module 2 includes a coil assembly 21, a valve core assembly 22 and an oil circuit assembly 23. It is easy to understand that the valve core assembly 22 is arranged in the coil assembly 21, and the oil circuit assembly 23 is connected to the valve core assembly 22. When the coil 212 is energized, the valve core body 222 moves to control the opening and closing and the opening degree of the oil circuit assembly 23, thereby controlling the movement of the oil.

[0044] like Figure 1 and 2 As shown, the coil assembly 21 is entirely disposed within the upper mounting groove 13 of the housing 1. The coil assembly 21 includes a coil housing 211 and a coil 212. The coil housing 211 is fixedly disposed within the upper mounting groove 13 of the housing 1. A downwardly opening valve core mounting groove 215 is provided within the coil housing 211 for connection to the valve core assembly 22. The valve core mounting groove 215 communicates with the communicating hole 15 of the housing 1. The coil 212 is disposed within the coil housing 211 and is located outside the valve core mounting groove 215. It is easy to understand that the coil 212 is wound within the coil housing 211, and the contact pins of the coil 212 extend from the top of the coil housing 211.

[0045] The coil assembly 21 further includes a gasket 213 , which is disposed in the coil housing 211 .

[0046] A retaining spring 214 is provided on the outer surface of the coil housing 211, and the coil housing 211 is fixedly connected to the housing 1 via the retaining spring 214. It is easy to understand that a groove adapted to the retaining spring 214 is provided on the circumferential side surface of the coil housing 211, and a groove adapted to the retaining spring 214 is also provided on the inner wall of the upper mounting groove 13 of the housing 1. The retaining spring 214 secures the coil housing 211 to the housing 1.

[0047] As shown in the figure, the valve core assembly 22 as a whole passes through the upper mounting groove 13 and the lower mounting groove 14 of the housing 1 and is connected to the coil assembly 21. Under the action of the coil assembly 21, the valve core assembly 22 achieves the effect of controlling the size of the oil circuit.

[0048] The valve core assembly 22 includes a valve core housing 221 , a valve core body 222 , and a valve core base 223 .

[0049] The valve core housing 221 is inserted upward from the lower mounting groove 14 into the valve core mounting groove 215 of the coil housing 211. The valve core housing 221 and the coil housing 211 form an interference fit. Preferably, a second O-ring 225 is disposed between the valve core housing 221 and the top surface of the lower mounting groove 14. The valve core housing 221 is fixedly connected to the housing 1 and the coil housing 211 through an interference fit to ensure the sealing performance of the vibration damping oil. Oil flows between the valve core assembly 22 and the lower mounting groove 14 of the housing 1. The second O-ring 225 prevents oil from entering the upper mounting groove 13 and the coil assembly 21 through the connecting hole 15 of the housing 1, preventing oil leakage.

[0050] The valve core housing 221 is provided with a valve core movable groove 226 with an opening facing downward, the valve core body 222 is in the valve core movable groove 226, the valve core base 223 is provided at the opening of the valve core movable groove 226, and the bottom end of the valve core body 222 passes through the valve core base 223, wherein the valve core body 222 is slidably connected to the valve core housing 221, the valve core base 223 is fixedly connected to the valve core housing 221, and the valve core base 223 and the valve core body 222 are clearance-fitted, that is, the valve core body 222 can move along the valve core movable groove 226, and when the valve core body 222 moves down a sufficient distance, the valve core base 223 limits the valve core body 222 from continuing to move downward.

[0051] Furthermore, the valve core assembly 22 also includes a valve core sleeve 224, which is interference fitly arranged on the top of the valve core movable groove 226 of the valve core housing 221, and the top valve core sleeve 224 of the valve core body 222 is clearance fit, effectively reducing the wear and abnormal noise risk caused by the valve core body 222 during operation.

[0052] like Figure 1 As shown, in the present invention, the valve core body 222 includes a rod-shaped portion and a cylindrical portion. The cylindrical portion is fixedly arranged outside the rod-shaped portion and has a clearance fit with the valve core housing 221. When the valve core body 222 moves, the cylindrical portion and the rod-shaped portion first move within the valve core movable groove 226. When the cylindrical portion moves downward and contacts the valve core base 223, the cylindrical portion is restricted by the valve core base 223. Both the rod-shaped portion and the cylindrical portion are provided with through holes along the axial direction to facilitate the passage of oil.

[0053] The oil circuit assembly 23 includes a circulation housing 231 , a valve core limiting cover 232 , a circulation valve plate 233 , a circulation valve plate seat 234 , a spring 235 , a spring base 236 and a housing limiting cover 237 .

[0054] like Figure 5 As shown, a first flat groove 2313 is provided on the top surface of the circulation shell 231, and a second flat groove 2314 is provided on the side surface. The first flat groove 2313 is connected to the second flat groove 2314 to form a flow channel. The top of the circulation shell 231 is embedded in the lower mounting groove 14 of the shell 1. The circulation shell 231 and the shell 1 are interference fit. A stepped mounting hole 2312 is provided along the axis of the circulation shell 231. The diameter of the stepped mounting hole 2312 increases from top to bottom. The top of the stepped mounting hole 2312 is connected to the first flat groove 2313. A plurality of oil through holes 2311 are radially provided on the circumferential side surface of the circulation shell 231. The oil through holes 2311 are located below the shell 1 and are connected to the stepped mounting holes 2312. Therefore, the flow channel from the bottom end of the stepped mounting hole 2312 to the surface of the circulation shell 231 can form an oil passage, and the bottom end of the stepped mounting hole 2312 to the oil through hole 2311 also forms an oil passage.

[0055] The stepped mounting hole 2312 is aligned with the valve core movable groove 226 of the valve core housing 221. The valve core stopper cover 232 is loosely mounted on the top of the stepped mounting hole 2312. The valve core stopper cover 232 defines a first through hole 2321 along its axis. The valve core stopper cover 232 defines a plurality of second through holes 2322 around the first through hole 2321. The bottom end of the valve core body 222 is embedded in the first through hole 2321. The second through holes 2322 connect the stepped mounting hole 2312 with the first flat groove 2313. As the valve core body 222 continues to descend, it pushes the valve core stopper cover 232 downward.

[0056] The circulation valve plate 233 is arranged below the valve core limit cover 232. The circulation valve plate 233 is provided with multiple through holes to facilitate the passage of oil. The circulation valve plate seat 234 is arranged below the circulation valve plate 233 to limit the movement distance of the circulation valve plate 233. The circulation valve plate seat 234 is provided with a third through hole 2341 along the axis. The spring base 236 is arranged below the circulation valve plate seat 234. The spring base 236 is provided with a spring mounting groove 2361 that opens upward. The spring 235 is arranged in the spring mounting groove 2361 and is located between the circulation valve plate seat 234 and the spring base 236. The bottom surface of the spring mounting groove 2361 is provided with a fourth through hole 2362 along the axis. , so that the spring mounting groove 2361 is connected to the step mounting groove, and a plurality of semicircular grooves 238 are further provided on the bottom surface of the spring base 236. The shell limiting cover 237 is interference fit in the step mounting hole 2312 and is located below the spring base 236. The shell limiting cover 237 is provided with a fifth through hole 2371 along the axis, and a plurality of semicircular grooves 238 are also provided on the top surface of the shell limiting cover 237. The semicircular grooves 238 of the spring base 236 and the shell limiting cover 237 correspond to form an oil passage. There is a gap between the spring base 236 and the shell limiting cover 237, and the oil passage is connected to the gap, and the oil passage is also connected to the oil through hole 2311 on the side.

[0057] The circulation valve plate 233, the circulation valve plate 233 and the spring mounting groove 2361 are all fitted with the circulation housing 231. Under the action of the downward movement of the valve core body 222, the valve core limit cover 232 moves downward to apply pressure to the circulation valve plate 233, thereby applying pressure to the circulation valve plate seat 234. The function of the spring 235 is to bear the oil thrust from the bottom to the top.

[0058] In the oil circuit assembly 23, oil flows through the first through-hole 2321, the third through-hole 2341, the fourth through-hole 2362, and the fifth through-hole 2371, the valve core stopper 232, the circulation valve disc 233, the circulation valve disc seat 234, the spring 235, and the housing stopper 237, allowing oil to flow from the bottom of the stepped mounting hole 2312 to the first flat slot 2313 outside the top. When the valve core body 222 enters the first through-hole 2321 of the valve core stopper 232, the amount of oil entering the first flat slot 2313 is reduced. Furthermore, the valve core body 222 continues to move downward, pushing the valve core stopper 232 downward, causing the circulation valve disc 233 to deform, further reducing the amount of oil passing through. The coordination of the coil assembly 21, the valve core assembly 22, and the oil circuit assembly 23 achieves control of oil flow.

[0059] It should be noted that the working process of the solenoid valve module 2 of the present invention is the same as that of the existing CDC shock absorber external solenoid valve.

[0060] In the present invention, the mechanical valve module 3 is arranged at the bottom of the stepped mounting hole 2312 in the circulation housing 231 and below the housing limit cover 237 . A buffer chamber 4 is formed between the mechanical valve module 3 and the housing limit cover 237 .

[0061] Specifically, such as Figure 8 As shown, the mechanical valve module 3 includes a fixed screw 35 and a stop seat 32, a valve plate seat 33, a valve body 31 and a valve body seat 34 arranged from top to bottom. The valve body 31 is fixedly arranged in the circulation shell 231. The fixed screw 35 passes through the stop seat 32, the valve plate seat 33, the valve body 31 and the valve body seat 34 and is fixedly connected. The valve body 31 is provided with a plurality of axial through holes 38 around the fixed screw 35 to facilitate the passage of oil. The valve plate seat 33 and the valve body are provided with multiple layers of first valve plates 37. The first valve plate 37 is on the axial through hole 38. A second valve plate 36 is also arranged between the first valve plate 37 and the valve body 31. The oil flows into the buffer chamber 4 through the axial through hole 38 and the slotted valve plate.

[0062] The first valve disc 37 is a conventional valve disc, and the second valve disc 36 is a slotted valve disc.

[0063] Under the action of the first valve plate 37 and the second valve plate 36, the mechanical valve module 3 limits the flow of oil when the shock absorber oil enters the buffer chamber 4. In combination with the buffer chamber 4, the mechanical valve module 3 itself has the function of adjusting the damping force of the shock absorber. The mechanical valve module 3 cooperates with the solenoid valve module 2 to further expand the damping force range of the shock absorber, and can achieve more balance points between comfort and handling stability, effectively respond to the demand for damping force under various road conditions, and enable the shock absorber to fully play its role.

[0064] like Figure 9The working principle of the present invention is as follows:

[0065] The vibration damping oil flow in this utility model mainly has two directions. The first flow path is from the bottom of the stepped mounting hole 2312 in the circulation housing 231 along the axial through hole 38 of the mechanical valve body 31, the buffer chamber 4, the fifth through hole 2371 of the housing stop cover 237, the gap formed between the housing stop cover 237 and the spring base 236, the oil passage, and the oil through hole 2311 of the circulation housing 231. The second flow path is from the bottom of the stepped mounting hole 2312 in the circulation housing 231 along the axial through hole 38 of the mechanical valve body 31, the buffer chamber 4, the fifth through hole 2371 of the housing stop cover 237, the fourth passage of the spring base 236, the spring mounting groove 2361, the third through hole 2341 of the circulation valve disc seat 234, the circulation valve disc 233, the first through hole 2321 and the second through hole 2322 of the valve core stop cover 232, and the flow path formed between the circulation housing 231 and the outer shell 1.

[0066] The damping oil must flow through the mechanical valve module 3, the buffer chamber 4, and the fifth through hole 2371 of the housing limit cover 237 in all states. When the solenoid valve module 2 fails, the damping oil flows through two flow channels, which can effectively avoid the impact of the solenoid valve module 2 failure on the damping performance of the shock absorber. The function of the mechanical valve module 3 is always maintained. In the normal state of the solenoid valve module 2, when the solenoid valve module 2 is in a high current state (1.6A), such as Figure 11 As shown, the valve core assembly 22 applies pressure to the flow valve plate 233 to cut off the second flow channel, and the damping oil flows along the first flow channel. When the solenoid valve module 2 is in a low current state (0A), as shown in FIG. Figure 10 As shown, the vibration damping oil can flow along the first flow channel and the second flow channel.

[0067] The embodiments provided by the present invention are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only intended to help understand the core concept of the present invention. It should be noted that, for those skilled in the art, without departing from the principles of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A CDC shock absorber external solenoid valve dual valve system structure, characterized in that: The invention comprises a housing (1), and a solenoid valve module (2) and a mechanical valve module (3) arranged in the housing (1); the mechanical valve module (3) is in communication with an oil circuit of the solenoid valve module (2); and a buffer chamber (4) is formed between the mechanical valve module (3) and the solenoid valve module (2); The mechanical valve module (3) includes a fixed screw (35) and a stop seat (32), a valve body (31) and a valve body seat (34) arranged from top to bottom. The fixed screw (35) passes through the stop seat (32), the valve seat (33), the valve body (31) and the valve body seat (34) and is fixedly connected. The valve body (31) is provided with a plurality of axial through holes (38) around the fixed screw (35). The axial through holes (38) allow the damping oil to flow into the buffer chamber (4).

2. The CDC shock absorber external solenoid valve dual valve system structure according to claim 1 is characterized in that: The mechanical valve module (3) further comprises a valve disc seat (33), wherein the valve disc seat (33) is located between the stop seat (32) and the valve body (31), and the valve disc seat (33) and the valve body are provided with a plurality of layers of first valve discs (37), wherein the first valve disc (37) is located on the axial through hole (38), and a second valve disc (36) is further provided between the first valve disc (37) and the valve body (31), wherein the second valve disc (36) is a slotted valve disc, and oil flows into the buffer chamber (4) through the axial through hole (38) and the slotted valve disc.

3. The CDC shock absorber external solenoid valve dual valve system structure according to claim 2, characterized in that: The first valve disc (37) is composed of three layers, and the diameters of the three layers of the first valve disc (37) increase from top to bottom. The first valve disc (37) located at the bottom is located above the axial through hole (38).

4. The CDC shock absorber external solenoid valve dual valve system structure according to any one of claims 1 to 3, characterized in that: The inner cavity of the housing (1) is divided into an upper mounting groove (13) opening upward and a lower mounting groove (14) opening downward, the bottom of the upper mounting groove (13) is connected to the bottom of the lower mounting groove (14) through a connecting hole (15), and the components connected to the housing (1) and the shock absorber, the solenoid valve module (2) and the mechanical valve module (3) are installed in the housing (1).

5. The CDC shock absorber external solenoid valve dual valve system structure according to claim 4 is characterized in that: The solenoid valve module (2) comprises a coil assembly (21), a valve core assembly (22) and an oil circuit assembly (23); the valve core assembly (22) is arranged in the coil assembly (21), and the oil circuit assembly (23) is connected to the valve core assembly (22).

6. The CDC shock absorber external solenoid valve dual valve system structure according to claim 5, characterized in that: The coil assembly (21) comprises a coil housing (211) and a coil (212); the coil housing (211) is fixedly arranged in the upper mounting groove (13) of the housing (1); a downwardly opening valve core mounting groove (215) is arranged in the coil housing (211) for connecting with the valve core assembly (22); the valve core mounting groove (215) is communicated with the connecting hole (15) of the housing (1); and the coil (212) is arranged in the coil housing (211) and is located outside the valve core mounting groove (215).

7. The CDC shock absorber external solenoid valve dual valve system structure according to claim 6, characterized in that: The valve core assembly (22) integrally passes through the upper mounting groove (13) and the lower mounting groove (14) of the housing (1) and is connected to the coil assembly (21); The valve core assembly (22) includes a valve core housing (221), a valve core body (222), and a valve core base (223). The valve core housing (221) is inserted into the valve core installation groove (215) of the coil housing (211) from the lower installation groove (14). The valve core housing (221) is interference-fitted with the valve core installation groove (215) of the coil housing (211). The valve core housing (221) is provided with a valve core movable groove (226) with an opening facing downward. The valve core body (222) is located in the valve core movable groove (226). The valve core base (223) is provided at the opening of the valve core movable groove (226). The bottom end of the valve core body (222) passes through the valve core base (223).

8. The CDC shock absorber external solenoid valve dual valve system structure according to claim 7, characterized in that: The valve core assembly (22) further includes a valve core sleeve (224), which is interference-fittedly arranged on the top of the valve core movable groove (226) of the valve core housing (221), and the top end of the valve core sleeve (224) of the valve core body (222) is clearance-fitted.

9. The CDC shock absorber external solenoid valve dual valve system structure according to claim 8, characterized in that: The oil circuit assembly (23) includes a circulation housing (231), a valve core limiting cover (232), a circulation valve plate (233), a circulation valve plate seat (33) (234), a spring (235), a spring base (236), and a housing limiting cover (237) arranged in the circulation housing (231); The top surface of the circulation shell (231) is provided with a first flat groove (2313), and the side surface is provided with a second flat groove (2314). The first flat groove (2313) and the second flat groove (2314) are communicated with each other to form a flow channel. The top of the circulation shell (231) is embedded in the lower mounting groove (14) of the shell (1). The circulation shell (231) and the shell (1) are interference-fitted. A stepped mounting hole (2312) is provided along the axis of the circulation shell (231). The diameter of the stepped mounting hole (2312) increases from top to bottom. The top of the stepped mounting hole (2312) is communicated with the first flat groove (2313). A plurality of oil through holes (2311) are radially provided on the circumferential side surface of the circulation shell (231). The oil through holes (2311) are located below the shell (1), and the oil through holes (2311) are communicated with the stepped mounting holes (2312). The stepped mounting hole (2312) is aligned with the valve core movable groove (226) of the valve core housing (221); the valve core limiting cover (232) is arranged at the top of the stepped mounting hole (2312) with clearance fit; the valve core limiting cover (232) is provided with a first through hole (2321) along the axis; the valve core limiting cover (232) is provided with a plurality of second through holes (2322) around the first through hole (2321); the bottom end of the valve core body (222) is embedded in the first through hole (2321); the second through holes (2322) connect the stepped mounting hole (2312) with the first flat groove (2313); The circulation valve plate (233) is arranged below the valve core limit cover (232), the circulation valve plate seat (33) (234) is arranged below the circulation valve plate (233), the circulation valve plate seat (33) (234) is provided with a third through hole (2341) along the axis, the spring base (236) is arranged below the circulation valve plate seat (33) (234), the spring base (236) is provided with a spring installation groove (2361) opening upward, the spring (235) is arranged in the spring installation groove (2361), and is located between the circulation valve plate seat (33) (234) and the spring base (236), the bottom surface of the spring installation groove (2361) is provided with a fourth through hole (2362) along the axis, so that the spring installation groove (2361) is in contact with the spring installation groove (2361). The stepped mounting groove is connected, the bottom surface of the spring base (236) is further provided with a plurality of semicircular grooves (238), the housing limit cover (237) is interference-fittedly arranged in the stepped mounting hole (2312) and is located below the spring base (236), the housing limit cover (237) is provided with a fifth through hole (2371) along the axis, the top surface of the housing limit cover (237) is also provided with a plurality of semicircular grooves (238), the semicircular grooves (238) of the spring base (236) and the housing limit cover (237) correspond to form an oil passage, there is a gap between the spring base (236) and the housing limit cover (237), the oil passage is connected with the gap, and the oil passage is also connected with the oil through hole (2311) on the side; The valve body (31) is fixedly arranged in the circulation housing (231) and is located below the housing limit cover (237). A buffer chamber (4) is formed between the valve body (31) and the housing limit cover (237).

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