A cdc shock absorber damping valve

Abstract

The application relates to a CDC shock absorber damping valve, belonging to the technical field of damping valves, which comprises an outer shell, a valve sleeve assembly and a top rod assembly, the valve sleeve assembly is fixed on the outer shell, the top rod assembly can reciprocate relative to the valve sleeve assembly, the valve sleeve assembly is provided with a valve port, a main discharge port and an auxiliary discharge port which are communicated with the valve port respectively, the top rod assembly is provided with a follow-up valve core for opening and closing the main discharge port, the main discharge port is in a closed state when the damping valve is not powered, and the main discharge port is in an open state when the damping valve is powered, and the output end of the auxiliary discharge port is provided with a pressure relief valve assembly for generating reverse support. The application integrates the pressure relief valve assembly through the auxiliary discharge port, can continuously generate reverse support in a zero-current state, eliminates abnormal shaking caused by insufficient suspension support in low-speed driving, and improves the stability of the vehicle body. The working mode of the pressure relief valve assembly replaces electromagnetic force to maintain the basic pressure, so that the vehicle can be in a power-off state during normal driving period, thereby reducing energy consumption.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of damping valves, in particular to a CDC shock absorber damping valve. BACKGROUND

[0002] The CDC (Continuous Damping Control) continuous damping control system is a key technology for improving the dynamic performance of a vehicle by adjusting the damping force of a shock absorber in real time. In this system, the CDC shock absorber damping valve, as the core executive component, controls the oil flow cross section through the electromagnetic valve to achieve stepless adjustment of the damping force. Its performance directly affects the handling stability and ride comfort of the vehicle, especially in the field of new energy vehicles, the requirements for energy consumption and precision are more stringent.

[0003] The existing shock absorber damping valve includes an outer shell, a valve sleeve assembly and a top rod assembly, wherein the top rod assembly is composed of a top pin and a top rod in linkage cooperation. When energized, the electromagnetic force drives the top pin to move in the direction of the valve port, and the oil flow is adjusted by changing the fitting distance between the sealing end of the top pin and the valve port, thereby realizing linear control of the damping force of the shock absorber.

[0004] For the above-mentioned shock absorber damping valve, the inventors believe that the structure has the following fundamental defects in the zero current (i.e. no power) state: due to the inability to establish effective pressure support in the initial position, when the vehicle is driving at low speed or encounters a small flow condition, the shock absorber loses the ability to support the vehicle body, resulting in the risk of instability of the vehicle body posture. SUMMARY

[0005] In order to improve the pressure loss problem in the zero current state and improve the shock absorption stability of the vehicle in various conditions, the present application provides a CDC shock absorber damping valve.

[0006] The CDC shock absorber damping valve provided by the present application adopts the following technical scheme:

[0007] A CDC shock absorber damping valve, comprising an outer shell, a valve sleeve assembly and a top rod assembly, the valve sleeve assembly is fixed on the outer shell, the top rod assembly can reciprocate relative to the valve sleeve assembly, the valve sleeve assembly is provided with a valve port and a main discharge port and an auxiliary discharge port respectively communicated with the valve port;

[0008] The top rod assembly is provided with a follow-up valve core for opening and closing the main discharge port, when the damping valve is not powered, the main discharge port is in a closed state, when the damping valve is powered, the main discharge port is in an open state;

[0009] The output end of the auxiliary discharge port is provided with a pressure relief valve assembly for generating reverse support.

[0010] Optionally, the pressure relief valve assembly comprises a mounting shell, a top head and a supporting spring, the mounting shell is provided with a pressure relief hole near one end of the auxiliary discharge port, the mounting shell is provided with a mounting inner cavity in communication with the pressure relief hole, the top head is in sliding fit with the side wall of the mounting inner cavity, one end of the supporting spring is connected with the end of the mounting inner cavity away from the pressure relief hole, and the other end of the supporting spring is connected with the top head.

[0011] Optionally, the top rod assembly comprises a top rod member and a moving iron core fixed on the top rod member, and the outer shell is provided with a coil inside the outer shell.

[0012] Optionally, the top rod member comprises a top rod body and a top needle for changing the opening degree of the valve port, the moving iron core is fixed on the top rod body, the top needle is arranged at one end of the top rod body close to the valve port, the follow-up valve core is arranged on the top needle, a pilot spring is sleeved outside the top needle, one end of the pilot spring abuts against the valve sleeve assembly, and the other end of the pilot spring abuts against the follow-up valve core.

[0013] Optionally, the valve sleeve assembly comprises an iron core sleeve and a valve seat sleeve fixed on the inner side of the outer shell, the valve port is arranged on the valve seat sleeve, the main discharge port and the auxiliary discharge port are arranged on the iron core sleeve, and the pressure relief valve assembly is detachably connected with the valve seat sleeve.

[0014] Optionally, the valve seat sleeve is provided with a mounting groove matched with the mounting shell, one side of the top head away from the discharge hole is provided with a guide rod, the supporting spring is sleeved outside the guide rod, the mounting groove is provided with a through hole through which the guide rod passes, and one side of the valve seat sleeve close to the mounting groove is provided with a stop gap for stopping the guide rod.

[0015] Optionally, the outer shell is fixed with a guide sleeve, a magnetism guiding seat is fixedly assembled in the guide sleeve, a guide shaft sleeve is fixed in the magnetism guiding seat, the top rod body is slidably arranged in the guide shaft sleeve, a limiting step is arranged at one end of the guide sleeve away from the top needle, a limiting stop edge is arranged on the iron core sleeve and extends into the guide sleeve, a ring-shaped groove is arranged on one side of the guide sleeve close to the outer shell, and an O-shaped sealing ring is arranged in the ring-shaped groove.

[0016] Optionally, a first discharge gap is formed between the outer side of the limiting stop edge and the inner wall of the guide sleeve, one end of the first discharge gap is in communication with the valve port, and the other end of the first discharge gap is in communication with the auxiliary discharge port.

[0017] Optionally, the valve seat sleeve is provided with a guide ring on one side close to the limiting stop edge, the follow-up valve core is in sliding fit with the inner side of the guide ring, a second discharge gap is formed between the inner side of the limiting stop edge and the outer wall of the guide ring, one end of the second discharge gap is in communication with the valve port, and the other end of the second discharge gap is in communication with the main discharge port.

[0018] Optionally, a magnetic isolation sleeve is arranged in the outer housing, and the magnetic isolation sleeve is arranged between the moving iron core and the coil.

[0019] In summary, the present application includes at least one of the following beneficial technical effects:

[0020] 1. The pressure relief valve assembly integrated through the auxiliary discharge port can generate a continuous reverse support force in a zero-current state, eliminating abnormal shaking caused by insufficient suspension support force during low-speed driving, and improving the shock stability of the vehicle in various working conditions. By replacing the traditional electromagnetic force to maintain the basic pressure mode, the system can be in a power-off state during normal driving period, significantly reducing the overall energy consumption load of the vehicle suspension system, while avoiding the control signal drift problem caused by small current fluctuations.

[0021] 2. The pressure relief valve assembly independently bears the function of establishing initial support pressure. The first discharge gap does not need to rely on the extremely small opening of the traditional scheme to achieve flow resistance control. The design constraints of the first discharge gap are completely removed, and its size can be fully enlarged to the extent that allows conventional contaminants carried by oil to pass freely, thereby eliminating the risk of stuck spool caused by impurity retention. After the first discharge gap is enlarged, the oil flow boundary layer resistance decreases simultaneously, which is conducive to reducing the viscous energy consumption during the actuation of the damping valve, and further delaying the performance degradation trend of the valve sealing material under long-term thermal load. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a schematic diagram of the overall structure of a CDC shock absorber damping valve according to Embodiment 1 of the present application.

[0023] Figure 2 is a schematic diagram of the structure of the valve sleeve assembly and the pressure relief valve assembly according to Embodiment 1 of the present application.

[0024] Figure 3 is a schematic diagram of the structure of the top rod assembly according to Embodiment 1 of the present application.

[0025] Figure 4 is Figure 2 is a partial enlarged view of position A in FIG. 6.

[0026] Figure 5 is a schematic diagram of the structure of the adjustment assembly according to Embodiment 2 of the present application.

[0027] Explanation of reference signs: 1, outer shell; 11, coil; 12, magnetic isolation sleeve; 13, guide sleeve; 131, limiting step; 132, O-shaped sealing ring; 2, valve sleeve assembly; 21, iron core sleeve; 211, main discharge port; 2111, second discharge gap; 212, auxiliary discharge port; 2121, first discharge gap; 213, limiting stop edge; 22, valve seat sleeve; 221, valve port; 222, mounting groove; 2221, through hole; 223, stop gap; 224, guide ring; 3, ejector rod assembly; 31, ejector rod; 311, ejector rod body; 3111, magnetic guide seat; 312, ejector pin; 3121, follow-up valve core; 313, pilot spring; 32, moving iron core; 4, pressure relief valve assembly; 41, mounting shell; 411, pressure relief hole; 412, mounting inner cavity; 42, top head; 43, support spring; 44, guide rod; 5, adjusting assembly; 51, adjusting washer; 52, adjusting bolt. DETAILED DESCRIPTION

[0028] The following Figures 1-5 , the application is further described in detail.

[0029] Example 1

[0030] The application embodiment 1 discloses a CDC shock absorber damping valve. Referring to Figure 1 , a CDC shock absorber damping valve, comprising an outer shell 1, a valve sleeve assembly 2 and an ejector rod assembly 3, the valve sleeve assembly 2 is fixed on the outer shell 1, the ejector rod assembly 3 can reciprocate relative to the valve sleeve assembly 2, the valve sleeve assembly 2 is provided with a valve port 221 and a main discharge port 211 and an auxiliary discharge port 212 which are communicated with the valve port 221 respectively. The ejector rod assembly 3 is provided with a follow-up valve core 3121 for opening and closing the main discharge port 211, when the damping valve is not powered, the main discharge port 211 is in a closed state, when the damping valve is powered, the main discharge port 211 is in an open state; the output end of the auxiliary discharge port 212 is provided with a pressure relief valve assembly 4 for generating reverse support.

[0031] When the damping valve is in a non-powered (zero current) state, the follow-up valve core 3121 drives the main discharge port 211 to close, the oil path of the auxiliary discharge port 212 is activated, the high-pressure oil flows into the auxiliary discharge port 212 through the valve port 221, and then flows to the pressure relief valve assembly 4, when the oil extrudes the pressure relief valve assembly 4, the pressure relief valve assembly 4 generates reverse support, so that the vehicle body weight can be lifted in the idling / low-speed working condition.

[0032] When the damping valve is in the energized state, the follow-up valve core 3121 drives the main discharge port 211 to open. Due to the arrangement of the pressure relief valve assembly 4, the flow resistance of the main discharge port 211 is much lower than that of the output end of the auxiliary discharge port 212, and the oil is switched to the main circuit. High-pressure oil flows directly to the main discharge port 211 through the valve port 221, and the auxiliary discharge port 212 is idle. At this time, the pressure relief valve assembly 4 remains open, but there is no substantial oil flow.

[0033] The application can generate a sustained reverse support force in the zero-current state through the pressure relief valve assembly 4 integrated with the auxiliary discharge port 212, eliminate abnormal shaking caused by insufficient suspension support force during low-speed driving, and improve the shock stability of the vehicle in all working conditions. By replacing the traditional electromagnetic force to maintain the basic pressure mode, the system can be in a power-off state during normal driving period, which can greatly reduce the overall energy consumption load of the suspension system of the new energy vehicle, and avoid the problem of control signal drift caused by small current fluctuations.

[0034] Referring to Figure 2 , the pressure relief valve assembly 4 includes a mounting shell 41, a top head 42, and a support spring 43. The mounting shell 41 is provided with a pressure relief hole 411 at one end close to the auxiliary discharge port 212. The mounting shell 41 is provided with a mounting inner cavity 412 in communication with the pressure relief hole 411. The top head 42 is in sliding fit with the side wall of the mounting inner cavity 412. One end of the support spring 43 is connected to the bottom wall of the mounting inner cavity 412 away from the pressure relief hole 411, and the other end of the support spring 43 is connected to the side of the top head 42 away from the discharge hole. In this embodiment, the support spring 43 is a compression spring.

[0035] Referring to Figure 1 and Figure 3 , the top rod assembly 3 includes a top rod 31 and a moving iron core 32 fixed on the top rod 31. The coil 11 is fixed in the outer shell 1 and is located outside the moving iron core 32. In this way, the electromagnetic coupling structure of the moving iron core 32 and the coil 11 realizes the millisecond displacement response of the top rod 31, and improves the real-time damping adjustment of the vehicle in the bending or jolt road conditions. The magnetic shield sleeve 12 is also fixed in the outer shell 1 and is located between the moving iron core 32 and the coil 11. In this way, the magnetic shield sleeve 12 blocks the magnetic flux path of the moving iron core 32, so that the electromagnetic driving force is improved, and a larger valve port 221 opening adjustment margin is realized under the same current.

[0036] Referring to Figure 2 and Figure 3The top rod member 31 includes a top rod body 311 and a top pin 312 for changing the opening degree of the valve port 221. The moving iron core 32 is fixed to the outer side wall of the top rod body 311. The top pin 312 is fixed to one end of the top rod body 311 close to the valve port 221. The follower valve core 3121 is integrally formed on the top pin 312. The through hole for the oil to pass through from the valve port 221 is formed on the non-circumferential side wall of the follower valve core 3121. The outer side of the top pin 312 is sleeved with a pilot spring 313. One end of the pilot spring 313 abuts against the valve sleeve assembly 2, and the other end abuts against the follower valve core 3121. In this embodiment, the pilot spring 313 is a compression spring. Under the preset pushing force of the pilot spring 313, the top rod body 311 is pushed to the stroke limit position when power off. At this time, the top pin 312 completely separates from the valve port 221, and the follower valve core 3121 closes the inlet of the main relief port 211, forcing the oil to turn to the pressure relief valve assembly 4 of the auxiliary relief port 212, and establishing zero current support pressure. After power on, the electromagnetic force overcomes the pilot spring 313 to drive the top rod body 311. The top pin 312 moves to the valve port 221 direction, gradually reduces the opening degree of the valve port 221, and the follower valve core 3121 synchronously releases the plugging of the main relief port 211. The main oil way is preferentially opened under the action of oil pressure difference. The continuous compression of the pilot spring 313 keeps the position feedback of the top pin 312, so that the opening degree of the valve port 221 is linearly mapped with the current value, and the precise control of damping force is realized.

[0037] With reference to Figure 1 And Figure 2 The valve sleeve assembly 2 includes an iron core sleeve 21 fixed to the inner side of the outer shell 1 and a valve seat sleeve 22. The valve port 221 is formed on the valve seat sleeve 22. The main relief port 211 and the auxiliary relief port 212 are formed on the iron core sleeve 21. The pressure relief valve assembly 4 is detachably connected with the valve seat sleeve 22. The valve seat sleeve 22 is provided with a mounting groove 222 matched with the installation shell 41. In this embodiment, the outer side of the installation shell 41 is provided with external threads, and the mounting groove 222 is provided with internal threads matched with the external threads, so as to realize the detachable assembly of the installation shell 41 and the mounting groove 222. The guide rod 44 is fixed to the side of the top head 42 away from the relief hole. The guide rod 44 is slidably arranged in the installation shell 41. The support spring 43 is sleeved on the outer side of the guide rod 44. The mounting groove 222 is provided with a through hole 2221 through which the guide rod 44 passes. The side of the valve seat sleeve 22 close to the mounting groove 222 is provided with a stop notch 223 for stopping the guide rod 44. The axial stroke of the guide rod 44 is mechanically constrained by the limiting notch, and the compression amount of the support spring 43 is controlled in the elastic deformation safety range, so as to avoid the failure of the spring caused by excessive compression due to over displacement of the top head 42.

[0038] With reference to Figures 1-3The outer shell is fixedly assembled with a guide sleeve 13, the guide sleeve 13 is fixedly assembled with a magnetic guide seat 3111, the magnetic guide seat 3111 is press-fitted with a guide shaft sleeve 3112, a top rod body 311 is slidably arranged in the guide shaft sleeve 3112, and the guide sleeve 13 is integrally formed with a limiting step 131 at an end away from the ejector pin 312.

[0039] With reference to Figure 2 The iron core sleeve 21 is integrally formed with a limiting baffle 213 extending into the guide sleeve 13, an outer side of the limiting baffle 213 and an inner wall of the guide sleeve 13 form a first discharge gap 2121, one end of the first discharge gap 2121 is communicated with a valve port 221, and the other end of the first discharge gap 2121 is communicated with an auxiliary discharge port 212. In order to reduce the risk of oil leakage of the outer shell 1, a ring-shaped groove is formed on a side of the guide sleeve 13 close to the outer shell 1, and an O-shaped sealing ring 132 is installed in the ring-shaped groove. In this way, the pressure relief valve assembly 4 independently bears the function of establishing the initial supporting pressure, the first discharge gap 2121 does not need to rely on the extremely small opening of the traditional scheme to realize the flow resistance control, the design constraint of the first discharge gap 2121 is completely removed, and the size can be fully enlarged to the extent that the conventional contaminants carried by the oil can freely pass through, which structurally eliminates the risk of the follow-up valve core 3121 being stuck due to the retention of impurities; after the first discharge gap 2121 is enlarged, the oil flow boundary layer resistance is also reduced synchronously, which is beneficial to reduce the viscous energy consumption in the damping valve actuation process, and further delay the performance degradation trend of the valve sealing material under long-term thermal load.

[0040] With reference to Figure 2 and Figure 4, the valve seat sleeve 22 is integrally formed with a guide ring 224 on one side close to the limiting stop 213, the follow-up valve core 3121 is in sliding fit with the inner side of the guide ring 224, the inner side of the limiting stop 213 and the outer wall of the guide ring 224 form a second discharge gap 2111, one end of the second discharge gap 2111 is communicated with the valve port 221, the other end of the second discharge gap 2111 is communicated with the main discharge port 211, and the inlet of the second discharge gap 2111 is closed by the circumferential side wall of the follow-up valve core 3121. In this way, the axial sliding of the follow-up valve core 3121 in the inner side of the guide ring 224 forms dynamic opening and closing control of the inlet end of the second discharge gap 2111: when power off, the follow-up valve core 3121 moves axially backward to close the inlet of the second discharge gap 2111, forcing the oil flow to the first discharge gap 2121 and then to the pressure relief valve assembly 4 through the auxiliary discharge port 212, so as to form an initial support force in the zero current state; when power on, the follow-up valve core 3121 moves axially forward, the inlet of the second discharge gap 2111 is opened, and the oil enters the main discharge port 211 through the second discharge gap 2111 to form a low-resistance passage. The second discharge gap 2111 constitutes a front control flow channel of the main discharge port 211, and precise guidance of the follow-up valve core 3121 by the guide ring 224 realizes precise opening and closing control of the main discharge port 211.

[0041] The implementation principle of the embodiment 1 of the present application is: when the damping valve is in a non-powered (zero current) state, the follow-up valve core 3121 drives the main discharge port 211 to be closed, the oil path of the auxiliary discharge port 212 is activated, high-pressure oil flows into the auxiliary discharge port 212 through the valve port 221, and then flows to the pressure relief valve assembly 4, and when the oil extrudes the pressure relief valve assembly 4, the pressure relief valve assembly 4 generates a reverse support, so that the vehicle body weight can be lifted in the idling / low-speed working condition.

[0042] When the damping valve is in a powered state, the follow-up valve core 3121 drives the main discharge port 211 to be opened, and due to the setting of the pressure relief valve assembly 4, the flow resistance of the main discharge port 211 is much lower than that of the output end of the auxiliary discharge port 212, so the oil automatically switches to the main path, high-pressure oil directly flows to the main discharge port 211 through the valve port 221, and the auxiliary discharge port 212 is idle, at this time, the pressure relief valve assembly 4 remains in an open state, but there is no substantial oil flow.

[0043] The pressure relief valve assembly 4 integrated by the auxiliary discharge port 212 can generate a continuous reverse support force in the zero current state, eliminate abnormal shaking caused by insufficient suspension support force during low-speed driving, and improve the shock stability of the vehicle in all working conditions. By replacing the traditional electromagnetic force to maintain the basic pressure mode with the pressure relief valve assembly 4, the system can be in a power-off state during normal driving period, greatly reducing the overall energy consumption load of the new energy vehicle suspension system, and avoiding the problem of control signal drift caused by small current fluctuations.

[0044] In addition, the application independently bears the function of establishing the initial supporting pressure through the pressure relief valve assembly 4, the first discharge gap 2121 does not need to rely on the extremely small opening of the traditional scheme to realize the flow resistance control, the design constraint of the first discharge gap 2121 is completely removed, and the size can be fully enlarged to the extent that the conventional contaminants carried by the oil can freely pass through, thereby eliminating the risk of the follow-up valve core 3121 being stuck due to impurity retention from the structure; after the first discharge gap 2121 is enlarged, the oil flow boundary layer resistance is also reduced synchronously, which is beneficial to reduce the viscous energy consumption in the damping valve actuation process, and further delay the performance degradation trend of the sealing material in the valve under long-term thermal load.

[0045] Embodiment 2:

[0046] With reference to Figure 1 Embodiment two of the application discloses a CDC shock absorber damping valve. With reference to Figure 5 The difference between the second embodiment and the first embodiment is that the adjusting assembly 5 for adjusting the initial pre-compression amount of the supporting spring 43 is arranged in the mounting shell 41, the adjusting assembly 5 includes the adjusting washer 51 and a plurality of adjusting bolts 52, the adjusting washer 51 is arranged between the bottom wall of the mounting inner cavity 412 and the supporting spring 43, the plurality of adjusting bolts 52 are threadedly connected to the mounting shell 41, and the tail portions of the adjusting bolts 52 are all in abutment with the adjusting washer 51 after extending into the mounting inner cavity 412, the initial pre-compression amount of the supporting spring 43 can be changed by screwing the adjusting bolts 52 and then changing the length of the adjusting bolts 52 extending into the mounting inner cavity 412, and the longer the length of the adjusting bolts 52 extending into the mounting inner cavity 412, the greater the initial pre-compression amount of the supporting spring 43.

[0047] The size of the reverse supporting force output by the supporting spring 43 is calculated according to formula (1):

[0048] F=k·Δx+k·x0; formula (1)

[0049] Wherein, k is the elastic coefficient of the supporting spring 43, x0 is the initial pre-compression amount of the supporting spring 43, and Δx is the working compression amount of the supporting spring 43.

[0050] According to formula (1), under the zero flow condition, the initial supporting force F0 of the supporting spring 43 is k·x0, the F0 can be changed by adjusting x0, without the need to replace the supporting spring 43, and the initial static pre-load force of the pressure relief valve assembly 4 can be fine-tuned through the adjusting bolts 52.

[0051] The above are preferred embodiments of the application, which do not limit the protection scope of the application, therefore: any equivalent changes made on the structure, shape, principle of the application shall be covered within the protection scope of the application.

Claims

1. A CDC shock absorber damping valve characterized by: The application relates to a damping valve, which comprises an outer shell (1), a valve sleeve assembly (2) and a top rod assembly (3), the valve sleeve assembly (2) is fixed on the outer shell (1), the top rod assembly (3) can reciprocate relative to the valve sleeve assembly (2), the valve sleeve assembly (2) is provided with a valve port (221) and a main discharge port (211) and an auxiliary discharge port (212) which respectively communicate with the valve port (221), the top rod assembly (3) is provided with a follow-up valve core (3121) for opening and closing the main discharge port (211), the main discharge port (211) is in a closed state when the damping valve is not powered, and the main discharge port (211) is in an open state when the damping valve is powered, and the output end of the auxiliary discharge port (212) is provided with a pressure relief valve assembly (4) for generating reverse support. The pressure relief valve assembly (4) comprises a mounting shell (41), a top head (42) and a support spring (43), one end of the mounting shell (41) close to the auxiliary discharge port (212) is provided with a pressure relief hole (411), the mounting shell (41) is provided with a mounting inner cavity (412) which communicates with the pressure relief hole (411), the top head (42) is arranged in sliding fit with the side wall of the mounting inner cavity (412), one end of the support spring (43) is connected with the end of the mounting inner cavity (412) away from the pressure relief hole (411), and the other end of the support spring (43) is connected with the top head (42). The top rod assembly (3) comprises a top rod piece (31) and a moving iron core (32) fixed on the top rod piece (31), and the outer shell (1) is provided with a coil (11) on the outer side of the moving iron core (32). The top rod piece (31) comprises a top rod body (311) and a top pin (312) for changing the opening degree of the valve port (221), the moving iron core (32) is fixed on the top rod body (311), the top pin (312) is arranged at one end of the top rod body (311) close to the valve port (221), the follow-up valve core (3121) is arranged on the top pin (312), and the outer side of the top pin (312) is provided with a pilot spring (313), one end of the pilot spring (313) abuts against the valve sleeve assembly (2), and the other end of the pilot spring (313) abuts against the follow-up valve core (3121).

2. A CDC shock absorber damping valve according to claim 1, characterized in that: The valve sleeve assembly (2) comprises an iron core sleeve (21) fixed on the inner side of the outer shell (1) and a valve seat sleeve (22), the valve port (221) is arranged on the valve seat sleeve (22), the main discharge port (211) and the auxiliary discharge port (212) are arranged on the iron core sleeve (21), and the pressure relief valve assembly (4) is detachably connected with the valve seat sleeve (22).

3. A CDC shock absorber damping valve according to claim 2, characterized in that: The valve seat sleeve (22) is provided with a mounting groove (222) matched with the mounting shell (41), the top head (42) is provided with a guide rod (44) away from the discharge hole, the guide rod (44) is slidably arranged in the mounting shell (41), the supporting spring (43) is sleeved on the outer side of the guide rod (44), the mounting groove (222) is provided with a through hole (2221) for the guide rod (44) to pass through, and the valve seat sleeve (22) is provided with a stop notch (223) for stopping the guide rod (44) on the side close to the mounting groove (222).

4. A CDC shock absorber damping valve according to claim 3, characterized in that: The outer shell (1) is fixed with a guide sleeve (13), the guide sleeve (13) is fixedly provided with a magnetic guide seat (3111), the magnetic guide seat (3111) is fixedly provided with a guide shaft sleeve (3112), the top rod body (311) is slidably arranged in the guide shaft sleeve (3112), the guide sleeve (13) is provided with a limiting step (131) away from the ejector pin (312), the iron core sleeve (21) is provided with a limiting stop edge (213) extending into the guide sleeve (13), the guide sleeve (13) is provided with an annular groove on the side close to the outer shell (1), and an O-shaped sealing ring (132) is arranged in the annular groove.

5. A CDC shock absorber damping valve according to claim 4, characterized in that: The outer side of the limiting stop edge (213) and the inner wall of the guide sleeve (13) form a first discharge gap (2121), one end of the first discharge gap (2121) is communicated with the valve port (221), and the other end is communicated with the auxiliary discharge port (212).

6. A CDC shock absorber damping valve according to claim 4, characterized in that: The valve seat sleeve (22) is provided with a guide ring (224) on the side close to the limiting stop edge (213), the follow-up valve core (3121) is slidably arranged on the inner side of the guide ring (224), the inner side of the limiting stop edge (213) and the outer wall of the guide ring (224) form a second discharge gap (2111), one end of the second discharge gap (2111) is communicated with the valve port (221), and the other end is communicated with the main discharge port (211).

7. A CDC shock absorber damping valve according to claim 1, characterized in that: The outer shell (1) is provided with a magnetic isolation sleeve (12), and the magnetic isolation sleeve (12) is arranged between the moving iron core (32) and the coil (11).

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