Solenoid valve for precisely adjustable damping force vibration damper

Abstract

This invention discloses a solenoid valve for a shock absorber with precisely adjustable damping force, comprising a solenoid valve housing and a solenoid valve cavity housing. The solenoid valve cavity housing contains, in sequence, a control valve core, a valve plate, and an inner valve core. The solenoid valve housing also contains a coil and a valve stem. The outer end of the inner valve core has an inner valve core flow channel hole, and the periphery of the inner valve core has an inner valve core circumferential hole. The periphery of the solenoid valve cavity housing has a housing circumferential hole corresponding to the position of the inner valve core circumferential hole. The opening degree of the first flow channel between these two holes is controllable. The valve plate has a tapered hole, and the control valve core has a tapered structure corresponding to the tapered hole of the valve plate. The overlap degree of the third flow channel between these two is controllable. This invention enables two-stage adjustment of the damping fluid outflow, resulting in a wider range of damping force adjustment, more linear and precise adjustment, significantly improving the comfort and smoothness of vehicle driving.

Description

Technical Field

[0001] This invention relates to a pump valve, specifically to a shock absorber solenoid valve used in automotive suspension damping systems. Background Technology

[0002] Continuously adjustable shock absorbers (also known as CDC shock absorbers) used in semi-active automotive suspensions aim to regulate the damping force of the shock absorber under different currents by operating a solenoid valve. This, in turn, adjusts the stiffness of the shock absorber and the amplitude of vibrations in the vehicle chassis, resulting in a more comfortable ride. Since the vehicle chassis needs appropriate damping performance at certain times, semi-active suspension is chosen to achieve this. A commonly used semi-active suspension is the CDC electromagnetic suspension, whose control core is the CDC shock absorber solenoid valve. During driving on different road surfaces, the suspension control unit (ECU) adjusts the damping force of the CDC shock absorber via different currents through the solenoid valve, based on the road bumps, ensuring a smooth ride and stable handling under various road conditions.

[0003] Currently, shock absorber solenoid valves include a solenoid valve housing and a solenoid valve cavity housing. The solenoid valve cavity housing contains a control valve core, a valve plate, and an inner valve core, arranged sequentially. The solenoid valve housing also contains a coil and a valve stem. The inner valve core has an inner valve core flow channel hole. A second flow channel is formed between the outer surface of the solenoid valve cavity housing and the inner surface of the solenoid valve housing. A third flow channel is formed between the control valve core and the valve plate. The inner valve core flow channel hole, the second, and the third flow channels supply the damping fluid. However, the solenoid valve cavity housing and the inner valve core are only fitted together by the inner valve core, while the control valve core (cylindrical) and the valve plate (with a circular hole) are simply connected. This results in insufficient adjustment range, non-linear adjustment of the damping force and flow resistance of the shock absorber, affecting the comfort and smoothness of the vehicle's ride. Furthermore, the solenoid valve housing is connected externally by welding, making installation and disassembly inconvenient. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a damper solenoid valve with a large damping force adjustment range and precise linear adjustment.

[0005] The objective of this invention is achieved through the following technical solution: a solenoid valve for a damping force-adjustable shock absorber, comprising a solenoid valve housing and a solenoid valve cavity housing, wherein a control valve core, a valve plate, and an inner valve core are sequentially installed inside the solenoid valve cavity housing; a coil and a valve stem are installed inside the solenoid valve housing; the valve stem is connected to the control valve core; the outer end of the inner valve core has an inner valve core flow channel hole; a circumferential hole for the inner valve core is provided on the periphery of the inner valve core; and a circumferential hole for the outer shell corresponding to the position of the circumferential hole for the inner valve core is provided on the periphery of the solenoid valve cavity housing.

[0006] The solenoid valve cavity shell has a circumferential groove on its periphery and at the joint with the solenoid valve shell, and the inner end of the solenoid valve cavity shell has an inner end groove.

[0007] A limit cap is installed at the outer end of the solenoid valve cavity housing. A first step is provided on the inner wall of the solenoid valve cavity housing at the junction with the inner end of the inner valve core, for better limiting the left and right movement of the inner valve core. The valve plate has a tapered hole, and the control valve core has a tapered surface structure corresponding to the tapered hole of the valve plate. The outer connecting part of the solenoid valve housing has a threaded structure to facilitate external installation, connection, and disassembly. A second step is provided on the inner wall of the solenoid valve cavity housing at the junction with the valve plate, for easier installation and limiting / positioning of the valve plate.

[0008] With this invention, the damping fluid enters through the inner valve core flow channel hole of the inner valve core. The outflow of the damping fluid is controlled by the opening of the first flow channel formed between the circumferential hole of the inner valve core and the circumferential hole of the outer shell through the displacement of the inner valve core. It can also be controlled by the overlap of the third flow channel formed between the conical structure of the control valve core and the conical hole of the valve plate, thereby forming a two-stage regulation of the outflow of the damping fluid. This makes the damping force adjustment range larger, the adjustment more linear and more precise, and significantly improves the comfort and smoothness of the car ride. Attached Figure Description

[0009] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0010] Figure 1 This is a schematic diagram of the structure of the present invention.

[0011] Figure 2 for Figure 1 A schematic diagram of the control valve core.

[0012] Figure 3 for Figure 1 A schematic diagram of the internal valve core.

[0013] Figure 4 for Figure 3 Cross-sectional view of the inner valve core.

[0014] Figure 5 for Figure 1 A schematic diagram of the structure of the solenoid valve cavity shell.

[0015] Figure 6 for Figure 5 Cross-sectional view of the solenoid valve cavity shell. Detailed Implementation

[0016] Reference Figures 1 to 6As can be seen, the present invention relates to a damping force precisely adjustable shock absorber solenoid valve for automotive suspension damping systems, comprising a solenoid valve housing 1 and a solenoid valve cavity housing 6. The solenoid valve cavity housing 6 contains, in sequence, a control valve core 2 (and a control valve core spring 8), a valve plate 3, and an inner valve core 4 (and an inner valve core spring 7). The solenoid valve housing 1 contains a coil 13 and a valve stem 12, the valve stem 12 being connected to the control valve core 2. The outer end of the inner valve core 4 has an inner valve core flow channel hole 42. The periphery of the inner valve core 4 (i.e., the inner valve core wall surface 43) is provided with several inner valve core circumferential holes 41. The periphery of the solenoid valve cavity housing 6 is provided with several housing circumferential holes 61 corresponding to the positions of the inner valve core circumferential holes. The solenoid valve cavity housing 6 has a circumferential groove 63 on its periphery, at the point where it connects with the solenoid valve housing (which facilitates the formation of a second flow channel 15 between it and the solenoid valve housing). The inner end of the solenoid valve cavity housing 6 has an inner end groove 62. The solenoid valve housing 1 has an inwardly protruding section that fits between the solenoid valve cavity housing 6 and the coil 13, strengthening the assembly between the solenoid valve housing and the solenoid valve cavity housing. The circumferential groove 63 and the circumferential hole 61 on the periphery of the solenoid valve cavity housing 6 are staggered and do not affect each other.

[0017] A limiting cap 5 (for limiting the outer end of the inner valve core) is installed at the outer end of the solenoid valve cavity housing 6. A first step 64 (for limiting the inner end of the inner valve core 4) is provided on the inner wall of the solenoid valve cavity housing 6 at the junction with the inner end of the inner valve core 4. The valve plate 3 has a tapered hole 30, and the control valve core 2 has a tapered structure 22 corresponding to the tapered hole of the valve plate (and a control valve core flow channel hole 21 on its side). The outer connecting part of the solenoid valve housing 1 has a threaded structure 31 to facilitate external installation, connection, and disassembly. A second step 65 is provided on the inner wall of the solenoid valve cavity housing 6 at the junction with the valve plate 3 for installing the valve plate and limiting and positioning it.

[0018] A first buffer space 9 is formed between the limiting cover 5, the inner valve core 4, and the solenoid valve cavity shell 6; a second buffer space 10 is formed between the inner valve core 4, the solenoid valve cavity shell 6, and the valve plate 3; and a third buffer space 11 is formed between the valve plate 3, the control valve core 2, and the solenoid valve cavity shell 6. The inner valve core circumferential hole 41 on the inner valve core 4 and the outer shell circumferential hole 61 on the solenoid valve cavity shell 6 form a first flow channel 14; a second flow channel 15 is formed between the outer surface of the solenoid valve cavity shell 6 and the inner surface of the solenoid valve shell 1; and a third flow channel 16 is formed between the control valve core 2 (its conical structure 22) and the valve plate 3 (its conical hole 30). The inner valve core 4 and the solenoid valve cavity housing 6 are fitted with a clearance fit to ensure normal left and right movement of the inner valve core; the solenoid valve cavity housing 6 is installed inside the solenoid valve housing 1, and the fit between the two is a tight fit; the valve plate 3 is installed on the second step 65 of the solenoid valve cavity housing, and its connection with the solenoid valve cavity housing 6 is a tight fit.

[0019] The working principle of this invention is as follows:

[0020] a) The damping fluid enters the first buffer space 9 through the limiting cover 5, and then enters the second buffer space 10 through the inner valve core flow channel hole 42 at the left end of the inner valve core 4. Part of the damping fluid flows out of the inner valve core and the outer shell of the solenoid valve cavity from the first flow channel 14, and another part of the damping fluid enters the third buffer space 11 through the third flow channel 16 formed between the tapered hole 30 of the valve plate 3 and the control valve core 2, and flows out from the second flow channel 15.

[0021] b) When the present invention is not powered on, the valve stem 12 is at its minimum displacement. The control valve core spring 8 pushes the control valve core 2 towards the end face of the valve stem 12. At this time, the third buffer space 11 is at the maximum opening of the third flow channel 16 formed by the conical structure 22 of the control valve core 2 and the conical hole 30 of the valve plate 3. The second buffer space 15 is subjected to the pressure of the damping fluid of the first buffer space 14 and the spring force. At this time, the inner valve core 4 is in force balance. The first flow channel 14 between the inner valve core peripheral hole 41 of the inner valve core and the outer shell peripheral hole 61 of the solenoid valve cavity is at its maximum opening position, and the damping force of the shock absorber is at its minimum value.

[0022] c) When the present invention is energized, as the current increases, the valve stem 12 moves towards the control valve core 2, increasing the force on the control valve core 2. When the electromagnetic force generated by the coil 13 is greater than the elastic force of the control valve core spring 8 and the damping force on the control valve core, the control valve core 2 moves towards the valve plate 3. The opening of the third flow channel 16 formed by the conical structure 22 of the control valve core and the valve plate gradually decreases. The gradual decrease of the third flow channel increases the internal pressure of the third buffer space 11, causing the internal pressure of the second buffer space 10 to also rise. The inner valve core 4 is always subjected to the left force, so the inner valve core 4 will move towards the direction of the limiting cover 5, causing the opening of the first flow channel 14 between the inner valve core circumferential hole 41 and the outer shell circumferential hole 61 of the solenoid valve cavity shell to decrease, that is, the oil output decreases, causing the damping force of the shock absorber to gradually increase.

[0023] d) When the current decreases, as the current gradually decreases, the control valve core 2 moves towards the coil 13 under the action of the control valve core spring 8. The third flow channel 16 formed by the conical structure 22 of the control valve core 2 and the valve plate 3 increases, the internal pressure of the third buffer space 11 decreases, and the pressure of the second buffer space 10 also decreases. The inner valve core 4 retracts towards the position of the valve plate 3, which increases the opening of the first flow channel 14 between the inner valve core circumferential hole 41 of the inner valve core 4 and the outer shell circumferential hole 61 of the solenoid valve cavity shell, i.e., the oil output increases, and the damping force of the shock absorber gradually decreases. Therefore, the flow rate of the damping fluid can be controlled by the opening of the first flow channel 14 formed between the inner valve core circumferential hole and the outer shell circumferential hole through the left and right displacement of the inner valve core 4, or by the overlap of the third flow channel 16 formed between the conical structure of the control valve core and the conical hole of the valve plate.

Claims

1. A solenoid valve for a damping force-adjustable shock absorber, comprising a solenoid valve housing and a solenoid valve cavity housing, wherein a control valve core and a control valve core spring, a valve plate, an inner valve core and an inner valve core spring are sequentially installed inside the solenoid valve cavity housing; a coil and a valve stem are installed inside the solenoid valve housing, wherein the valve stem is connected to the control valve core, characterized in that: The outer end of the inner valve core has an inner valve core flow channel hole, and the periphery of the inner valve core has an inner valve core circumferential hole. The periphery of the solenoid valve cavity shell has a shell circumferential hole corresponding to the position of the inner valve core circumferential hole. The periphery of the solenoid valve cavity shell and the area where it connects with the solenoid valve shell have a shell circumferential slot, and the inner end of the solenoid valve cavity shell has a shell inner end slot. A limit cap is installed at the outer end of the solenoid valve cavity shell. A first step is provided on the inner wall of the solenoid valve cavity shell at the point where it connects with the inner end of the inner valve core, and a second step is provided on the inner wall of the solenoid valve cavity shell at the point where it connects with the valve plate. The valve plate has... The control valve core has a conical structure corresponding to the conical hole of the valve plate. A first buffer space is formed between the limiting cover, the inner valve core, and the outer shell of the solenoid valve cavity; a second buffer space is formed between the inner valve core, the outer shell of the solenoid valve cavity, and the valve plate; a third buffer space is formed between the valve plate, the control valve core, and the outer shell of the solenoid valve cavity; a first flow channel is formed between the circumferential hole on the inner valve core and the circumferential hole on the outer shell of the solenoid valve cavity; a second flow channel is formed between the outer surface of the solenoid valve cavity and the inner surface of the solenoid valve cavity; and a third flow channel is formed between the conical structure of the control valve core and the conical hole of the valve plate. Its working principle is as follows: a) The damping fluid enters the first buffer space from the limit cover, and then enters the second buffer space through the inner valve core flow channel hole at the left end of the inner valve core. Part of the damping fluid flows out of the inner valve core and the outer shell of the solenoid valve cavity from the first flow channel, and another part of the damping fluid enters the third buffer space through the third flow channel formed between the conical hole of the valve plate and the control valve core, and flows out from the second flow channel. b) When not powered on, the valve stem is at its minimum displacement. The control valve core spring pushes the control valve core to the end face of the valve stem. At this time, the third buffer space is at the maximum opening of the third flow channel formed by the conical structure of the control valve core and the conical hole of the valve plate. The second buffer space is subjected to the pressure of the damping fluid in the first buffer space and the spring force. At this time, the inner valve core is in force balance. The first flow channel between the inner valve core peripheral hole and the outer shell peripheral hole of the solenoid valve cavity is at the maximum opening position, and the damping force of the shock absorber is at its minimum value. c) When energized, as the current increases, the valve stem moves towards the control valve core, increasing the force on the control valve core. When the electromagnetic force generated by the coil is greater than the spring force of the control valve core and the damping force on the control valve core, the control valve core moves towards the valve plate. The opening of the third flow channel formed by the conical structure of the control valve core and the valve plate gradually decreases. This gradual decrease in the third flow channel increases the internal pressure of the third buffer space, causing the internal pressure of the second buffer space to also rise. The total force on the inner valve core is to the left, so the inner valve core will move towards the direction of the limit cover, causing the opening of the first flow channel between the inner valve core circumferential hole and the outer shell circumferential hole of the solenoid valve cavity to decrease, i.e., the oil output decreases, causing the damping force of the shock absorber to gradually increase. d) When the current decreases, as the current gradually decreases, the control valve core moves towards the coil under the action of the control valve core spring. The third flow channel formed by the conical structure of the control valve core and the valve plate increases, the internal pressure of the third buffer space decreases, and the pressure of the second buffer space also decreases. The inner valve core retracts towards the position of the valve plate, which increases the opening of the first flow channel between the inner valve core circumferential hole and the outer shell circumferential hole of the solenoid valve cavity shell, i.e., the oil output increases, and the damping force of the shock absorber gradually decreases. Therefore, the output flow of the damping fluid can be controlled by the opening of the first flow channel formed between the inner valve core circumferential hole and the outer shell circumferential hole through the left and right displacement of the inner valve core, or by the overlap of the third flow channel formed between the conical structure of the control valve core and the conical hole of the valve plate.

2. The solenoid valve for a precisely adjustable damping force damper as described in claim 1, characterized in that: The outer connection part of the solenoid valve housing has a threaded structure.

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