Damping valve and shock absorber

Abstract

A damping valve and a shock absorber. The damping valve comprises an electromagnetic valve housing, a valve rod, a pilot valve structure, a main valve core, a valve cover, a safety valve structure and an elastic member. At least part of the valve rod is located in the electromagnetic valve housing and is configured to move along the extension direction of the axis; the valve cover is sleeved outside the valve rod and connected with the electromagnetic valve housing; the safety valve structure is located between the pilot valve structure and the valve cover and is configured to move along the extension direction of the axis; the elastic member is connected between the valve cover and the safety valve structure; the valve rod comprises a rod end face towards the main valve core, and the pilot valve structure comprises a pressing surface opposite to the rod end face; in the state that the valve rod is farthest away from the main valve core, the rod end face of the valve rod and the pressing surface of the pilot valve structure can be separated from each other, and the safety valve structure is abutted against the pilot valve structure under the force of the elastic member to apply an action force towards the main valve core to the pilot valve structure. In this way, the safety and use comfort of the damping valve can be balanced.

Description

Technical Field

[0001] At least one embodiment of this utility model relates to a damping valve and a vibration damper. Background Technology

[0002] The damping valve is one of the core control components of a vibration damper. The damping valve can provide variable damping force by adjusting the flow resistance of the damping fluid, thereby suppressing vibration, stabilizing pressure, or regulating motion speed to adapt to different working conditions. Utility Model Content

[0003] At least one embodiment of this utility model provides a damping valve and a vibration damper.

[0004] At least one embodiment of this utility model provides a damping valve, comprising: a solenoid valve housing having an axis; a valve stem, a pilot valve structure, and a main valve core, arranged sequentially along the extension direction of the axis; at least a portion of the valve stem is located within the solenoid valve housing, and the valve stem is configured to move along the extension direction of the axis; wherein the damping valve further comprises a valve cover, a safety valve structure, and an elastic element, the valve cover being sleeved outside the valve stem and connected to the solenoid valve housing; the safety valve structure being located between the pilot valve structure and the valve cover, and... It is configured to move along the extension direction of the axis; the elastic element is connected between the valve cover and the safety valve structure; the valve stem includes a stem end face facing the main valve core, and the pilot valve structure includes a pressure surface opposite to the stem end face; in the state where the valve stem is furthest away from the main valve core, the stem end face of the valve stem and the pressure surface of the pilot valve structure can be separated from each other, and the safety valve structure abuts against the pilot valve structure under the force of the elastic element to apply a force toward the main valve core to the pilot valve structure.

[0005] For example, according to at least one embodiment of the present invention, the damping valve further includes an electromagnetic drive unit, which includes a valve armature located inside the solenoid valve housing for driving the valve stem to move along the extension direction of the axis; when the electromagnetic drive unit is energized, the safety valve structure is attracted by the electromagnetic drive unit to abut against the valve cover, and the valve armature drives the valve stem to move toward the pilot valve structure in the extension direction of the axis so that the stem end face abuts against the pressure surface; when the electromagnetic drive unit is de-energized, the valve stem is in the state furthest away from the main valve core.

[0006] For example, according to at least one embodiment of the present invention, in the power-off state, and at least when the safety valve structure and the pilot valve structure are in contact, the maximum distance between the rod end face and the pressure surface in the extension direction of the axis is a first distance; the travel of the safety valve structure is greater than the first distance.

[0007] For example, according to at least one embodiment of the present invention, the damping valve further includes an elastic structure configured to provide an elastic force to the valve stem away from the main valve core in the power-off state, so that the valve stem is in the state furthest away from the main valve core.

[0008] For example, according to at least one embodiment of the present invention, the safety valve structure includes an abutment portion protruding toward the pilot valve structure, the abutment portion being configured to abut against the pilot valve structure; the orthographic projection of the abutment portion on a plane perpendicular to the axis is annular.

[0009] For example, according to at least one embodiment of the present invention, the safety valve structure is provided with an annular groove on the outer side of the abutment portion, and the edge of the orthographic projection of the pilot valve structure on a plane perpendicular to the axis is located within the orthographic projection of the annular groove on the plane.

[0010] For example, according to at least one embodiment of the present invention, there is a receiving cavity between the valve cover and the main valve core, and the safety valve structure is located in the receiving cavity to divide the receiving cavity into two sub-cavities; the safety valve structure includes a fluid passage configured to communicate with the two sub-cavities.

[0011] For example, according to at least one embodiment of the present invention, there is a gap between the sidewall of the fluid channel and the outer wall of the safety valve structure.

[0012] For example, according to at least one embodiment of the present invention, the solenoid valve housing includes a housing end face facing the safety valve structure; the fluid passage includes an opening facing the housing end face, the opening communicating with the sub-cavity; during the movement stroke of the safety valve structure, there is a gap between the opening and the housing end face.

[0013] For example, according to at least one embodiment of the present invention, the damping valve further includes a valve sleeve located on one side of the solenoid valve housing; wherein at least a portion of the main valve core is located within the valve sleeve, and the main valve core is configured to reciprocate along the extension direction of the axis;

[0014] The safety valve structure includes a protrusion that protrudes toward the valve sleeve, and the orthographic projection of the protrusion is annular on a plane perpendicular to the axis.

[0015] For example, according to at least one embodiment of the present invention, the pilot valve structure includes a pilot valve plate and a positioning seat, the pilot valve plate being connected to the side of the positioning seat facing the main valve core; the positioning seat includes a limiting groove, the bottom wall of the limiting groove including the pressure surface, and one end of the valve stem including the rod end face extending into the limiting groove.

[0016] For example, according to at least one embodiment of the present invention, the positioning seat includes a main body and a cylindrical extension. The main body is used to accommodate the pilot valve plate. The cylindrical extension is connected to the side of the main body away from the pilot valve plate and extends in a direction away from the pilot valve plate. The side of the cylindrical extension away from the main body includes the limiting groove. The safety valve structure is sleeved on the cylindrical extension.

[0017] For example, according to at least one embodiment of the present invention, one end of the valve stem including the rod end face is in clearance fit with the limiting groove.

[0018] At least one embodiment of the present invention provides a vibration damper, including a damping valve according to any of the above examples. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments will be briefly introduced below. Obviously, the drawings described below only involve some embodiments of this utility model, and are not intended to limit this utility model.

[0020] Figure 1 This is a schematic diagram of a damping valve provided in at least one embodiment of the present invention.

[0021] Figure 2 for Figure 1 A magnified view of a portion of point P is shown. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the described embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects.

[0024] The features "parallel," "perpendicular," and "identical" used in this invention include those strictly defined as "parallel," "perpendicular," and "identical," as well as those containing a certain degree of error, such as "approximately parallel," "approximately perpendicular," and "approximately identical." These terms represent acceptable deviations for a specific value, taking into account measurement and errors associated with the measurement of a particular quantity (i.e., limitations of the measurement system). In embodiments of this invention, "center" can include a strictly geometrically centered location and an approximate center location within a small area surrounding the geometrically centered location. For example, "approximately" can mean within one or more standard deviations, or within 10% or 5% of the value.

[0025] At least one embodiment of this utility model provides a damping valve, which includes a solenoid valve housing, a valve stem, a pilot valve structure, and a main valve core. The solenoid valve housing has an axis. The valve stem, pilot valve structure, and main valve core are arranged sequentially along the extension direction of the axis; at least a portion of the valve stem is located within the solenoid valve housing, and the valve stem is configured to move along the extension direction of the axis; the damping valve also includes a valve cover, a safety valve structure, and an elastic element. The valve cover is sleeved outside the valve stem and connected to the solenoid valve housing; the safety valve structure is located between the pilot valve structure and the valve cover and is configured to move along the extension direction of the axis; the elastic element is connected between the valve cover and the safety valve structure; the valve stem includes a stem end face facing the main valve core, and the pilot valve structure includes a pressure surface opposite to the stem end face; in the state where the valve stem is furthest from the main valve core, the stem end face of the valve stem and the pressure surface of the pilot valve structure can be separated from each other, and the safety valve structure abuts against the pilot valve structure under the force of the elastic element to apply a force toward the main valve core to the pilot valve structure.

[0026] At least one embodiment of this utility model also provides a vibration damper, including the above-described damping valve.

[0027] At least one embodiment of the damping valve and shock absorber provided by this utility model allows the valve stem end face to be separated from the pressure surface of the pilot valve structure when the valve stem is furthest from the main valve core (e.g., when the electromagnetic drive part of the damping valve is de-energized). The valve stem no longer applies a force toward the main valve core to the pilot valve structure. In this case, by providing a safety valve structure and an elastic element connected between the valve cover and the safety valve structure, the pilot valve structure can be independently controlled by the elastic element through the safety valve structure. For example, the safety valve structure can abut against the pilot valve structure under the force applied by the elastic element, thereby applying a force toward the main valve core to the pilot valve structure from the safety valve structure. When the pilot valve structure is independently controlled by the elastic element in the de-energized state, it is unaffected by the valve stem and other elastic structures connected to the valve stem. This makes the damping valve safer and more reliable in the de-energized state, and the safety in the de-energized state and the comfort of the vehicle using the damping valve can be balanced by adjusting the independently controlled elastic element.

[0028] The damping valve and vibration damper are described below with reference to the accompanying drawings and through some embodiments.

[0029] Figure 1 This is a schematic diagram of a damping valve provided in at least one embodiment of the present invention. Figure 2 for Figure 1 A magnified view of a portion of point P is shown.

[0030] refer to Figure 1 and Figure 2 The damping valve includes a solenoid valve housing 110, a valve stem 200, a pilot valve structure 300, and a main valve core 400. The solenoid valve housing 110 has an axis AX, and the valve stem 200, pilot valve structure 300, and main valve core 400 are arranged sequentially along the extension direction of the axis AX. For example, the pilot valve structure 300 is located between the valve stem 200 and the main valve core 400. At least a portion of the valve stem 200 is located within the solenoid valve housing 110, and the valve stem 200 is configured to move along the extension direction of the axis AX. For example, the valve stem 200 may be partially within the solenoid valve housing 110 and partially outside the solenoid valve housing 110. However, the invention is not limited to this; for example, in other examples, the valve stem may be entirely located within the solenoid valve housing.

[0031] refer to Figure 1 and Figure 2The damping valve also includes a valve cover 500, a safety valve structure 600, and an elastic element 700. The valve cover 500 is fitted over the valve stem 200 and connected to the solenoid valve housing 110. The safety valve structure 600 is located between the pilot valve structure 300 and the valve cover 500 and is configured to move along the extension direction of the axis AX. The elastic element 700 connects the valve cover 500 and the safety valve structure 600. The valve stem 200 includes a stem end face 201 facing the main valve core 400, and the pilot valve structure 300 includes a pressure surface 301 opposite to the stem end face 201. For example, the stem end face 201 and the pressure surface 301 are disposed opposite each other in the extension direction of the axis AX.

[0032] refer to Figure 1 and Figure 2 When the valve stem 200 is furthest away from the main valve core 400, the stem end face 201 of the valve stem 200 and the pressure surface 301 of the pilot valve structure 300 can be separated from each other, and the safety valve structure 600 abuts against the pilot valve structure 300 under the force of the elastic element 700, so as to apply a force toward the main valve core 400 to the pilot valve structure 300.

[0033] In the damping valve provided in this embodiment of the present invention, when the valve stem 200 is furthest from the main valve core 400 (for example, when the electromagnetic drive unit 800 of the damping valve is de-energized), the stem end face 201 of the valve stem 200 can be separated from the pressure surface 301 of the pilot valve structure 300, and the valve stem 200 no longer applies a force toward the main valve core 400 to the pilot valve structure 300. At this time, by providing a safety valve structure 600 and an elastic member 700 connected between the valve cover 500 and the safety valve structure 600, the pilot valve structure 300 can be independently controlled by the elastic member 700 through the safety valve structure 600. For example, the safety valve structure 600 can abut against the pilot valve structure 300 under the force applied by the elastic member 700, thereby applying a force toward the main valve core 400 to the pilot valve structure 300 by the safety valve structure 600. When the pilot valve structure 300 is independently controlled by the elastic element 700 in the power-off state, it is not affected by the valve stem 200 and other elastic structures 900 connected to the valve stem 200. This makes the damping valve safer and more reliable in the power-off state. Furthermore, the safety in the power-off state and the comfort of the vehicle using the damping valve can be balanced by adjusting the independently controlled elastic element 700.

[0034] Specifically, refer to Figure 1 and Figure 2Referring to the example described later, for instance, when the electromagnetic coil 820 of the electromagnetic drive unit 800 is suddenly de-energized, the valve stem 200 can be furthest away from the main valve core 400. In the event of a sudden power failure, the cooperation between the safety valve structure 600 and the elastic element 700 prevents the pilot valve structure 300 from failing due to the loss of the force applied by the valve stem 200. In other words, the pilot valve structure 300 will not directly lose control of the main valve core 400 due to the separation of the stem end face 201 of the valve stem 200 from it. The safety valve structure 600 can apply uniform and stable pressure to the pilot valve structure 300, which can continue to maintain stable pressure feedback and prevent the opening between the main valve core 400 and the pilot valve structure 300 from exceeding the set range. Moreover, the position of the valve stem 200 is uncertain during a sudden power failure. By decoupling the valve stem 200 from the pilot valve structure 300 in the event of a power failure, the deterioration of the controllability of the pilot valve structure 300 due to coupling between the valve stem 200 and the pilot valve structure 300 can be prevented. This improves the control stability of the damping valve and enhances the user's comfort experience.

[0035] refer to Figure 1 and Figure 2 For example, when the pilot valve structure 300 is subjected to a force toward the main valve core 400, the pilot valve structure 300 can directly abut against the main valve core 400, or it can have an opening between it and the main valve core 400 under the action of the damping fluid. This utility model does not limit this.

[0036] refer to Figure 1 For example, the elastic element 700 can be a spring. However, the present invention is not limited to this; for example, the elastic element 700 can also be other elements that can provide elastic force to the safety valve structure 600.

[0037] refer to Figure 1 and Figure 2 For example, the safety valve structure 600 may include a first mounting groove 602 facing the valve cover 500. In the extending direction of axis AX, the distance between the bottom wall of the first mounting groove 602 and the valve cover 500 can be the maximum distance between the safety valve structure 600 and the valve cover 500. An elastic element 700 may be connected between the bottom wall of the first mounting groove 602 and the valve cover 500. Providing a recessed first mounting groove 602 increases the space available to accommodate the elastic element 700. This improves the design flexibility of the elastic element 700, thereby enhancing the performance of the damping valve.

[0038] refer to Figure 1 and Figure 2For example, the valve cover 500 may include a second mounting groove 501 facing the safety valve structure 600. In the extension direction of axis AX, the distance between the bottom wall of the second mounting groove 501 and the safety valve structure 600 can be the maximum distance between the safety valve structure 600 and the valve cover 500. An elastic element 700 may be connected between the bottom wall of the second mounting groove 501 and the safety valve structure 600. Providing a recessed second mounting groove 501 increases the space available to accommodate the elastic element 700. This improves the design flexibility of the elastic element 700, thereby enhancing the performance of the damping valve.

[0039] refer to Figure 1 and Figure 2 It is understood that only the first mounting slot 602 can be provided, only the second mounting slot 501 can be provided, or both the first mounting slot 602 and the second mounting slot 501 can be provided. This utility model does not impose any restrictions as long as it is beneficial to improving the performance of the damping valve.

[0040] refer to Figure 1 and Figure 2 In some examples, the safety valve structure 600 includes an abutment portion 620 protruding toward the pilot valve structure 300, the abutment portion 620 being configured to abut against the pilot valve structure 300. In a plane perpendicular to the axis AX, the orthographic projection of the abutment portion 620 is annular. Thus, the annular abutment portion 620 can apply a more uniform force circumferentially to the pilot valve structure 300, thereby improving the stability, consistency, and control accuracy of the damping valve.

[0041] refer to Figure 1 and Figure 2 Referring to the examples described later, for instance, the abutment portion 620 may abut against the positioning seat 320 in the pilot valve structure 300. For example, the abutment portion 620 and the positioning seat 320 may have a clearance fit.

[0042] refer to Figure 1 and Figure 2 In some examples, the safety valve structure 600 has an annular groove 640 on the outer side of the abutment portion 620, and the edge of the orthographic projection of the pilot valve structure 300 on a plane perpendicular to the axis AX lies within the orthographic projection of the annular groove 640 on the plane. That is, the safety valve structure 600 can abut against the central region of the pilot valve structure 300. Compared to a scheme where the safety valve structure abuts against the edge region of the pilot valve structure, Figure 1 and Figure 2 The safety valve structure 600 shown applies a force to the central region of the pilot valve structure 300, which helps to improve the reliability of the safety valve structure 600.

[0043] refer to Figure 1In some examples, the damping valve also includes an electromagnetic drive unit 800, which includes a valve armature 820 located within the solenoid valve housing 110, for driving the valve stem 200 to move along the extension direction of the axis AX. The electromagnetic drive unit 800 also includes other structures, which will be discussed later and will not be elaborated here.

[0044] refer to Figure 1 When the electromagnetic drive unit 800 is energized, the safety valve structure 600 is attracted by the electromagnetic drive unit 800 to abut against the valve cover 500. The valve armature 810 drives the valve stem 200 to move toward the pilot valve structure 300 in the extension direction of the axis AX so that the stem end face 201 abuts against the pressure surface 301. For example, when energized, the electromagnetic drive unit 800 can generate an electromagnetic driving force, thereby attracting the safety valve structure 600 and driving the safety valve structure 600 to remain abut against the valve cover 500 under the action of the electromagnetic driving force. At the same time, the valve stem 200 moves toward the pilot valve structure 300 under the action of the electromagnetic driving force until it abuts against the pilot valve structure 300, and applies a force toward the main valve core 400 to the pilot valve structure 300.

[0045] refer to Figure 1 When the electromagnetic drive unit 800 is de-energized, the valve stem 200 is in the state furthest away from the main valve core 400. For example, the safety valve structure 600 can move away from the valve cover 500 under the elastic force of the elastic element 700 to abut against the pilot valve structure 300. For example, in the de-energized state, the electromagnetic drive unit 800 does not generate electromagnetic driving force, and the valve stem 200 will not exert a force toward the main valve core 400 on the pilot valve structure 300 under the action of electromagnetic driving force. At the same time, the safety valve structure 600 separates from the valve cover 500 under the action of the elastic element 700 and abuts against the pilot valve structure 300 to replace the valve stem 200 in exerting a force toward the main valve core 400 on the pilot valve structure 300.

[0046] refer to Figure 1 and Figure 2 In some examples, the damping valve also includes an elastic structure 900 configured to provide an elastic force to the valve stem 200 away from the main valve core 400 in the de-energized state, so that the valve stem 200 is in the state furthest from the main valve core 400. Thus, in the de-energized state, the valve stem 200 can be reset by the elastic force of the elastic structure 900, the stem end face 201 of the valve stem 200 separates from the pressure surface 301 of the pilot valve structure 300, and the valve stem 200 is no longer used to control the opening degree of the pilot valve structure 300 and the main valve core 400.

[0047] refer to Figure 1For example, the elastic structure 900 can be a spring. However, the present invention is not limited to this; for example, the elastic structure 900 can also be other structures that can provide elastic force to the valve stem 200.

[0048] refer to Figure 1 For example, multiple elastic structures 900 can be provided. For example, the elastic structure 900 can be connected between the valve armature 810 and the solenoid valve housing 110 along the extension direction of the axis AX. For example, a bushing 10 can be provided between the valve cover 500 and the valve stem 200 to guide the movement of the valve stem 200 in the extension direction of the axis AX, and the elastic structure 900 can be connected between the bushing 10 and the valve armature 810 along the extension direction of the axis AX.

[0049] refer to Figure 1 and Figure 2 It is understandable that only one elastic structure 900 may be provided. As long as the elastic structure 900 can provide an elastic force to the valve stem 200 to reset the valve stem 200, this utility model does not limit the number or placement of the elastic structures 900.

[0050] refer to Figure 1 For example, the electromagnetic drive unit 800 may include an electromagnetic coil 820, which may be sleeved on the outside of the solenoid valve housing 110. When the electromagnetic coil 820 is energized, the valve armature 810 can move along the extension direction of the axis AX of the solenoid valve housing 110 in the energized state of the electromagnetic drive unit 800.

[0051] refer to Figure 1 For example, the valve stem 200 can be fixedly connected to the valve armature 810. For example, the valve stem 200 can pass through the valve armature 810.

[0052] refer to Figure 1 For example, the solenoid valve housing 110 includes a magnetically conductive part 111 and a magnetically shielding part 112, with the magnetically shielding part 112 connected between the valve cover 500 and the magnetically conductive part 111. In the energized state, the safety valve structure 600 can be attracted to the valve cover 500, and the safety valve structure 600 does not exert a force on the pilot valve structure 300 towards the main valve core 400. After the safety valve structure 600 is attracted to the valve cover 500, the electromagnetic driving force increases, thereby driving the valve armature 810 to move towards the valve cover 500.

[0053] refer to Figure 1 For example, in the power-off state, the electromagnetic coil 820 no longer generates electromagnetic driving force, the valve armature 810 is reset under the elastic force of the elastic structure 900, and the valve armature 810 separates from the valve cover 500. The safety valve structure 600 can separate from the valve cover 500 under the elastic force of the elastic element 700 and abut against the pilot valve structure 300.

[0054] refer to Figure 2 In some examples, under power-off conditions, and at least when the safety valve structure 600 is abutting against the pilot valve structure 300, the maximum distance between the rod end face 201 and the pressure surface 301 in the direction of extension of the axis AX is a first distance D1. The stroke of the safety valve structure 600 is greater than the first distance D1. Therefore, it can be ensured that the control of the pilot valve structure 300 by the valve stem 200 is not interfered with during the stroke of the safety valve structure 600. It is understood that under power-off conditions, and when the safety valve structure 600 is abutting against the pilot valve structure 300, the distance between the rod end face 201 and the pressure surface 301 in the direction of extension of the axis AX can be determined based on the position of the main valve core 400.

[0055] refer to Figure 2 For example, in the power-off state, and at least when the safety valve structure 600 abuts against the pilot valve structure 300, the safety valve structure 600 and the solenoid valve housing 110 may be in the extension direction of the axis AX. Figure 2 The second spacing D2 shown indicates that the safety valve structure 600 and the valve cover 500 can be in the extension direction of the axis AX. Figure 2 The third spacing D3, the second spacing D2, and the third spacing D3 shown are all greater than the first spacing D1. It can be understood that the second spacing D2 and the third spacing D3 can be the spacing designed for the damping valve in its initial state, and the second spacing D2 and the third spacing D3 determine the maximum stroke of the safety valve structure 600. For example, the first spacing D1 can be designed to be smaller than the second spacing D2 and smaller than the third spacing D3.

[0056] refer to Figure 2 During the operation of the damping valve, there can be a certain opening between the pilot valve structure 300 and the main valve core 400. Consequently, the second distance D2 between the safety valve structure 600, which abuts against the pilot valve structure 300, and the solenoid valve housing 110, as well as the third distance D2 between the safety valve structure 600 and the valve cover 500, will also change accordingly.

[0057] refer to Figure 2 For example, the second gap D2 can be the gap between the safety valve structure 600 and the magnetic shielding part 112 in the extension direction of the axis AX. For example, the third gap D3 can be less than or equal to the second gap D2. Thus, in the energized state, it can be ensured that the safety valve structure 600 and the valve cover 500 are stably attracted together.

[0058] For example, depending on actual design needs, the second spacing can also be designed to be smaller than the third spacing, and this utility model does not impose any restrictions on this.

[0059] refer to Figure 1 and Figure 2In some examples, a receiving cavity A is provided between the valve cover 500 and the main valve core 400, and a safety valve structure 600 is located within the receiving cavity A to divide the receiving cavity A into two sub-cavities (e.g., Figure 1 and Figure 2 (See sub-cavities A1 and A2 shown). The safety valve structure 600 includes a fluid passage 610 configured to connect the two sub-cavities. By providing the fluid passage 610, gas flow is allowed during the movement of the safety valve structure 600 within the receiving cavity A along the extension direction of the axis AX, for venting purposes. This improves the flow smoothness of the damping fluid within the damping valve and optimizes the dynamic response speed of the safety valve structure 600.

[0060] refer to Figure 1 and Figure 2 There is a gap between the sidewall of the fluid passage 610 and the outer wall of the safety valve structure 600. That is, there is a certain thickness between the sidewall of the fluid passage 610 and the outer wall of the safety valve structure 600. Therefore, a higher precision fluid passage 610 can be formed during processing at a lower cost. For example, the radial dimensional accuracy of the fluid passage 610 is easier to control, which is beneficial to improving the stability, consistency, and control accuracy of the damping valve. Furthermore, the processing method is also simpler.

[0061] Of course, in other examples, a recess can also be formed on the outer wall of the safety valve structure to allow for contact with, for example, other features on the outer wall of the safety valve structure. Figure 1 The damping valve shown has a channel formed between the inner walls of its outer shell 01 and other structures, but this utility model does not limit this.

[0062] For example, refer to Figure 1 Referring to the examples described later, the housing 01 of the damping valve can be connected between the solenoid valve housing 110 and the valve sleeve 120. For example, the safety valve structure 600 can move within the housing 01 along the extension direction of the axis AX.

[0063] For example, refer to Figure 1 and Figure 2 The fluid channel 610 can extend along the extension direction of the axis AX to shorten the flow path of the damping fluid between sub-cavities A1 and A2, thereby accelerating the response speed of the safety valve structure 600.

[0064] However, this invention is not limited to this. Depending on actual needs, the fluid channel can be designed in other shapes. For example, the extension direction of the fluid channel can intersect the extension direction of the axis. For example, the fluid channel can extend obliquely. For example, the fluid channel can extend spirally. Of course, the fluid channel can have other design methods, and this invention does not limit these.

[0065] For example, there can be one or more fluid channels. If there are multiple fluid channels, they can be arranged at intervals around the circumference of the safety valve structure. This invention does not limit the number or location of the fluid channels.

[0066] refer to Figure 1 In some examples, the solenoid valve housing 110 includes a housing end face 101 facing the safety valve structure 600, and the fluid passage 610 includes an opening 601 facing the housing end face 101, which communicates with a sub-chamber. During the movement of the safety valve structure 600, there is a gap between the opening 601 and the housing end face 101. This allows for continuous flow of damping fluid within the two sub-chambers, enabling the safety valve structure 600 to maintain pressure balance throughout its movement.

[0067] refer to Figure 1 In some examples, the damping valve also includes a valve sleeve 120 located on one side of the solenoid valve housing 110. At least a portion of the main valve spool 400 is located within the valve sleeve 120, and the main valve spool 400 is configured to reciprocate along the extension direction of axis AX. For example, the main valve spool 400 may be completely located within the valve sleeve 120. Alternatively, the main valve spool 400 may be partially located within the valve sleeve 120 and partially outside the valve sleeve 120.

[0068] refer to Figure 1 and Figure 2 In some examples, the safety valve structure 600 includes a protrusion 630 that protrudes toward the valve sleeve 120, and the orthographic projection of the protrusion 630 on a plane perpendicular to the axis AX is annular. Therefore, during the movement of the safety valve structure 600, the area of ​​the outer wall of the safety valve structure 600 guided by the housing 01 of the damping valve is larger, and the guiding process is more stable, thereby improving the movement accuracy of the safety valve structure 600.

[0069] For example, refer to Figure 1 and Figure 2 The inner wall of the housing 01 is clearance-fitted with the outer wall of the safety valve structure 600 so as to guide the reciprocating motion of the safety valve structure 600 in the extension direction of the axis AX.

[0070] refer to Figure 2 In some examples, the pilot valve structure 300 includes a pilot valve disc 310 and a positioning seat 320, with the pilot valve disc 310 connected to the side of the positioning seat 320 facing the main valve spool 400. For example, the pilot valve disc 310 can be configured to limit the opening between itself and the main valve spool 400. For example, the pilot valve disc 310 can be a resilient disc.

[0071] refer to Figure 2In some examples, the positioning seat 320 includes a limiting groove 321, the bottom wall of which includes a pressure surface 301, and one end of the valve stem 200, including the rod end face 201, extends into the limiting groove 321. Thus, the limiting groove 321 can be used to restrict the relative movement of the valve stem 200 and the pilot valve structure 300 in the radial direction of the valve stem 200, that is, to guide the movement between the valve stem 200 and the pilot valve structure 300 to occur as much as possible only in the extension direction of the axis AX, thereby improving the stability of the relative movement between the valve stem 200 and the pilot valve structure 300, and also helping to improve the control accuracy and response speed of the pilot valve structure 300.

[0072] refer to Figure 2 In some examples, the positioning seat 320 includes a main body 322 and a cylindrical extension 323. The main body 322 is used to accommodate the pilot valve plate 310, and the cylindrical extension 323 is connected to the side of the main body 322 away from the pilot valve plate 310 and extends in a direction away from the pilot valve plate 310. The side of the cylindrical extension 323 away from the main body 211 includes a limiting groove 321. The safety valve structure 600 is sleeved on the cylindrical extension 323. Thus, the movement of the safety valve structure 600 in the extension direction of the axis AX can be guided by the cylindrical extension 323, thereby improving the stability and response speed of the safety valve structure 600.

[0073] For example, refer to Figure 2 The main body 322 can be a disc-shaped structure.

[0074] For example, in conjunction with the foregoing example, the abutment portion 620 of the safety valve structure 600 can be sleeved on the cylindrical extension portion 323 of the positioning seat 320 so that the movement between the safety valve structure 600 and the pilot valve structure 300 occurs as much as possible only in the extension direction of the axis AX.

[0075] refer to Figure 2 In some examples, one end of the valve stem 200, including the stem end face 201, is clearance-fitted with the limiting groove 321. This ensures smooth movement between the valve stem 200 and the pilot valve structure 300. Simultaneously, damping fluid can flow between the valve stem 200 and the limiting groove 321 to reduce or even eliminate movement resistance between the valve stem 200 and the pilot valve structure 300, and also helps reduce wear and abnormal noise.

[0076] At least one embodiment of this utility model also provides a vibration damper, including the above-described damping valve.

[0077] Since the damper according to the embodiment of this utility model uses the above-mentioned damping valve, it also has corresponding beneficial technical effects, which will not be described in detail here.

[0078] The following points need to be explained:

[0079] (1) The accompanying drawings of the embodiments of this utility model only involve the structures involved in the embodiments of this utility model. Other structures can be referred to the general design.

[0080] (2) Where there is no conflict, features of the same embodiment and different embodiments of the present invention can be combined with each other.

[0081] The above description is merely an exemplary embodiment of the present invention and is not intended to limit the scope of protection of the present invention. The scope of protection of the present invention is determined by the appended claims.

Claims

1. A damping valve, characterized in that, include: The solenoid valve housing has an axis; The valve stem, pilot valve structure, and main valve core are arranged sequentially along the extension direction of the axis; at least a portion of the valve stem is located within the solenoid valve housing, and the valve stem is configured to move along the extension direction of the axis. The damping valve further includes a valve cover, a safety valve structure, and an elastic element. The valve cover is sleeved outside the valve stem and connected to the solenoid valve housing. The safety valve structure is located between the pilot valve structure and the valve cover, and is configured to move along the extension direction of the axis; the elastic element is connected between the valve cover and the safety valve structure; The valve stem includes a stem end face facing the main valve core, and the pilot valve structure includes a pressure surface opposite to the stem end face; When the valve stem is furthest from the main valve core, the stem end face of the valve stem and the pressure surface of the pilot valve structure can be separated from each other, and the safety valve structure abuts against the pilot valve structure under the force of the elastic element to apply a force toward the main valve core to the pilot valve structure.

2. The damping valve according to claim 1, characterized in that, It also includes an electromagnetic drive unit, which includes a valve armature located inside the solenoid valve housing and is used to drive the valve stem to move along the extension direction of the axis. When the electromagnetic drive unit is energized, the safety valve structure is attracted by the electromagnetic drive unit to abut against the valve cover, and the valve armature drives the valve stem to move toward the pilot valve structure in the extension direction of the axis so that the end face of the stem abuts against the pressure surface; When the electromagnetic drive unit is de-energized, the valve stem is in the state furthest away from the main valve core.

3. The damping valve according to claim 2, characterized in that, In the power-off state, and at least when the safety valve structure and the pilot valve structure are abutting, the maximum distance between the rod end face and the pressure surface in the extension direction of the axis is the first distance; The travel distance of the safety valve structure is greater than the first spacing.

4. The damping valve according to claim 2, characterized in that, It also includes an elastic structure configured to provide an elastic force to the valve stem away from the main valve core in the power-off state, so that the valve stem is in the state furthest away from the main valve core.

5. The damping valve according to any one of claims 1-4, characterized in that, The safety valve structure includes an abutment portion protruding toward the pilot valve structure, the abutment portion being configured to abut against the pilot valve structure; On a plane perpendicular to the axis, the orthographic projection of the abutment portion is annular.

6. The damping valve according to claim 5, characterized in that, The safety valve structure has an annular groove on the outside of the abutment portion, and the edge of the pilot valve structure's orthographic projection on a plane perpendicular to the axis is located within the orthographic projection of the annular groove on that plane.

7. The damping valve according to any one of claims 1-4, characterized in that, There is a receiving cavity between the valve cover and the main valve core, and the safety valve structure is located in the receiving cavity to divide the receiving cavity into two sub-cavities; The safety valve structure includes a fluid passage configured to connect the two sub-chambers.

8. The damping valve according to claim 7, characterized in that, There is a gap between the sidewall of the fluid channel and the outer wall of the safety valve structure.

9. The damping valve according to claim 7, characterized in that, The solenoid valve housing includes a housing end face facing the safety valve structure; the fluid passage includes an opening facing the housing end face, the opening communicating with the sub-cavity; During the movement of the safety valve structure, there is a gap between the opening and the end face of the housing.

10. The damping valve according to any one of claims 1-4, characterized in that, It also includes a valve sleeve, located on one side of the solenoid valve housing; Wherein, at least a portion of the main valve core is located within the valve sleeve, and the main valve core is configured to reciprocate along the extension direction of the axis; The safety valve structure includes a protrusion that protrudes toward the valve sleeve, and the orthographic projection of the protrusion is annular on a plane perpendicular to the axis.

11. The damping valve according to any one of claims 1-4, characterized in that, The pilot valve structure includes a pilot valve plate and a positioning seat, wherein the pilot valve plate is connected to the side of the positioning seat facing the main valve core; The positioning seat includes a limiting groove, the bottom wall of which includes the pressure surface, and one end of the valve stem, including the rod end face, extends into the limiting groove.

12. The damping valve according to claim 11, characterized in that, The positioning seat includes a main body and a cylindrical extension. The main body is used to accommodate the pilot valve plate. The cylindrical extension is connected to the side of the main body away from the pilot valve plate and extends in a direction away from the pilot valve plate. The side of the cylindrical extension away from the main body includes the limiting groove. The safety valve structure is sleeved on the outside of the cylindrical extension.

13. The damping valve according to claim 11, characterized in that, One end of the valve stem, including the stem end face, is clearance-fitted with the limiting groove.

14. A vibration damper, characterized in that, Includes the damping valve according to any one of claims 1-13.

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