Passive damping valve for automobile shock absorber

Abstract

The utility model discloses a passive damping valve for an automobile shock absorber, which is used for being mounted on a piston rod of the shock absorber and comprises a piston, a first valve plate group, a second valve plate group and a pair of fixing blocks, and an axial mounting through hole suitable for being mounted on the piston rod is formed in the center of the piston. The piston is provided with a first end face and a second end face which are oppositely arranged, the piston is provided with a plurality of first flow channels and at least one second flow channel which penetrate through the first end face and the second end face, and the number of the first flow channels is larger than that of the second flow channels. Positioning holes coaxial with the axial mounting through hole are formed in the center positions of the first valve plate group and the second valve plate group, and the first valve plate group is fixed to the first end face of the piston, completely covers an outlet of the first flow channel and partially covers an inlet of the second flow channel. The two-way damper can achieve two-way damping, is compact in structure, and facilitates light-weight design of the damper.

Description

Technical Field

[0001] This utility model relates to a passive damping valve for automotive shock absorbers, belonging to the field of automotive shock absorption technology. Background Technology

[0002] Currently, hydraulic suspension requires the introduction of basic damping to attenuate vehicle body vibrations, facilitating vibration control. Passive valve systems can provide the necessary basic damping force to the hydraulic shock absorbers. However, existing passive valve systems on the market are bulky, difficult to install and arrange, and increase the weight of the shock absorbers, hindering system weight reduction.

[0003] A search of existing technologies revealed a Chinese patent (publication number CN217502416U) disclosing a piston assembly, a hydraulic damper, and a stepper for a hydraulic damper. This patent achieves a damping effect through the cooperation of a valve plate and a retaining ring. However, it was found that this method is only suitable for providing unidirectional damping force and cannot meet the needs of automotive shock absorbers. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a passive damping valve for automobile shock absorbers. It can achieve bidirectional damping, has a compact structure, and is conducive to the lightweight design of shock absorbers.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is: a passive damping valve for automotive shock absorbers, used for mounting on the piston rod of the shock absorber, comprising:

[0006] A piston, wherein the piston has an axial mounting through hole at its center suitable for mounting on the piston rod, the piston has a first end face and a second end face disposed opposite to each other, and the piston has a plurality of first flow channels and at least one second flow channel passing through the first end face and the second end face, wherein the number of first flow channels is greater than the number of second flow channels;

[0007] The first valve plate group and the second valve plate group are provided with positioning holes coaxial with the axial mounting through hole at their center positions. The first valve plate group is fixed to the first end face of the piston and completely covers the outlet of the first flow channel and partially covers the inlet of the second flow channel. The second valve plate group is fixed to the second end face of the piston and completely covers the outlet of the second flow channel and partially covers the inlet of the first flow channel.

[0008] A pair of fixing blocks, each fixing block having a mounting hole coaxial with the axial mounting through hole, the fixing blocks being respectively mounted on the first end face and the second end face of the piston, the fixing blocks being adapted to fix the corresponding first valve plate group and the second valve plate group;

[0009] When the first valve plate assembly is deformed by the fluid pressure from the first flow channel, it is adapted to form a flow gap from the second end face to the first end face; when the second valve plate assembly is deformed by the fluid pressure from the second flow channel, it forms a flow gap from the first end face to the second end face.

[0010] Furthermore, the passive damping valve for automotive shock absorbers also includes a base flow channel, which extends through the first end face of the piston and the inlet of the second flow channel, and the base flow channel is located outside the radial coverage area of ​​the first valve plate group and the second valve plate group.

[0011] Furthermore, the inner diameter of the base flow channel is smaller than the inner diameter of the second flow channel.

[0012] Furthermore, a specific structure of a first flow channel is provided, the first flow channel including a plurality of through first guide holes spaced apart along the circumferential direction of the piston, and a fan-shaped flow channel disposed on the first end face of the piston and communicating with the first guide holes, the fan-shaped flow channel corresponding one-to-one with the first guide holes;

[0013] The inlet end of the first guide hole is located within the coverage area of ​​the first valve plate group, and the outlet end of the first guide hole is located within the coverage area of ​​the second valve plate group;

[0014] The fan-shaped drainage channel has a connecting portion and an edge portion. The connecting portion of the fan-shaped drainage channel is connected to the corresponding first guide hole and is located within the coverage area of ​​the first valve plate group. The edge portion of the fan-shaped drainage channel extends outside the coverage area of ​​the first valve plate group.

[0015] Furthermore, a specific structure of the second flow channel is provided, the second flow channel including a plurality of through second guide holes spaced apart along the circumferential direction of the piston, and a guide groove disposed on the second end face of the piston and communicating with the second guide holes, the guide groove corresponding one-to-one with the second guide holes;

[0016] The inlet end of the second guide hole is located within the coverage area of ​​the second valve plate group, and the outlet end of the second guide hole is located within the coverage area of ​​the first valve plate group;

[0017] The flow channel includes a connecting portion and an edge portion. The connecting portion communicates with the corresponding second flow hole and is located within the coverage area of ​​the second valve plate group. The edge portion extends outside the coverage area of ​​the second valve plate group.

[0018] Furthermore, a specific structure for a second valve plate group is provided, the second valve plate group comprising a plurality of coaxially stacked valve plates, the outer diameter of the valve plates decreasing sequentially from the side closer to the piston to the side farther away from the piston.

[0019] Furthermore, the first valve plate group includes eight coaxially stacked valve plates.

[0020] By adopting the above technical solution, this utility model has the following beneficial effects:

[0021] In this invention, the first and second flow channels on the piston constitute the main flow channels for hydraulic oil in the shock absorber. The number of first flow channels exceeds the number of second flow channels, giving the shock absorber different damping characteristics under different operating conditions. When hydraulic oil flows from the first end face to the second end face through the first flow channel, it pushes the second valve plate assembly to deform and form a flow gap, generating greater resistance. When hydraulic oil flows from the second end face to the first end face through the second flow channel, it pushes the first valve plate assembly to deform and form a flow gap, generating less resistance. The deformation of the first and second valve plate assemblies changes with the hydraulic oil pressure, thereby achieving appropriate basic damping force under different operating conditions. The first and second valve plate assemblies are installed and fixed using a fixing block, ensuring stability during long-term operation.

[0022] In addition, a base flow channel is provided through the piston to provide a flow path for hydraulic oil before the valve plate opens, ensuring fluid stability under low flow rate conditions. At the same time, the second valve plate group adopts a stacked valve plate structure with progressively decreasing outer diameters, which not only enhances the precision of damping adjustment but also optimizes the structural strength and lightweight characteristics of the entire device, making it easy to integrate into the shock absorber and reducing the overall weight.

[0023] In summary, this utility model significantly improves the adaptability and reliability of the shock absorber by integrating and lightweighting the first and second valve plate groups, and effectively reduces production and usage costs. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural schematic diagram of the passive damping valve for automotive shock absorbers according to this utility model.

[0025] Figure 2 This is an exploded view of the passive damping valve for automotive shock absorbers according to this utility model.

[0026] Figure 3 This is a front view of the passive damping valve for automotive shock absorbers according to this utility model.

[0027] Figure 4 for Figure 3 Sectional view of AA in the middle;

[0028] Figure 5 This is a rear view of the passive damping valve for automotive shock absorbers according to this utility model.

[0029] Figure 6 for Figure 5 Cross-sectional view of the middle section (BB);

[0030] Figure 7 This is a three-dimensional structural diagram of the piston of the passive damping valve for automotive shock absorbers according to this utility model. Detailed Implementation

[0031] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0032] like Figure 1-7 As shown, a passive damping valve for automotive shock absorbers, for mounting on the piston rod of the shock absorber, includes:

[0033] Piston 1 has an axial mounting through hole 11 at its center, which is suitable for mounting on a piston rod. Piston 1 has a first end face 12 and a second end face 13 that are arranged opposite to each other. Piston 1 has a plurality of first flow channels 14 and at least one second flow channel 15 that pass through the first end face 12 and the second end face 13, wherein the number of first flow channels 14 is greater than the number of second flow channels 15.

[0034] The first valve plate group 21 and the second valve plate group 22 are both provided with positioning holes 23 coaxial with the axial mounting through hole 11 at their center positions. The first valve plate group 21 is fixed to the first end face 12 of the piston 1 and completely covers the outlet of the first flow channel 14 and partially covers the inlet of the second flow channel 15. The second valve plate group 22 is fixed to the second end face 13 of the piston 1 and completely covers the outlet of the second flow channel 15 and partially covers the inlet of the first flow channel 14.

[0035] A pair of fixing blocks 4, each fixing block 4 having a mounting hole 41 coaxial with the axial mounting through hole 11, the fixing blocks 4 are respectively mounted on the first end face 12 and the second end face 13 of the piston 1, and the fixing blocks 4 are adapted to fix the corresponding first valve plate group 21 and second valve plate group 22.

[0036] When the first valve plate group 21 is deformed by the fluid pressure from the first flow channel 14, it is adapted to form a flow gap from the second end face 13 to the first end face 12; when the second valve plate group 22 is deformed by the fluid pressure from the second flow channel 15, it forms a flow gap from the first end face 12 to the second end face 13.

[0037] In this embodiment, as Figure 1-7As shown, the first flow channel 14 and the second flow channel 15 on piston 1 constitute the main flow channels for hydraulic oil in the shock absorber. The number of first flow channels 14 is greater than the number of second flow channels 15, giving the shock absorber different damping characteristics under different operating conditions. When hydraulic oil flows from the first end face 12 to the second end face 13 through the first flow channel 14, it pushes the second valve plate assembly 22 to deform and form a flow gap, generating greater resistance. When hydraulic oil flows from the second end face 13 to the first end face 12 through the second flow channel 15, it pushes the first valve plate assembly 21 to deform and form a flow gap, generating less resistance. The deformation of the first valve plate assembly 21 and the second valve plate assembly 22 changes with the hydraulic oil pressure, thereby achieving appropriate basic damping force under different operating conditions. The first valve plate assembly 21 and the second valve plate assembly 22 are installed and fixed by the fixing block 4, ensuring stability during long-term operation.

[0038] A pair of fixing blocks 4 includes a first fixing block and a second fixing block. The first fixing block is mounted on the first end face 12, and the second fixing block is mounted on the second end face 13. In this embodiment, the first flow channel 14 has six channels, and the second flow channel 15 has three channels. In some embodiments, the specific number of the first flow channel 14 and the second flow channel 15 can be set according to actual needs.

[0039] Specifically, such as Figure 1-7 As shown, the passive damping valve for automotive shock absorbers also includes a base flow channel 16, which passes through the first end face 12 of the piston 1 and the inlet of the second flow channel 15. The base flow channel 16 is located outside the radial coverage area of ​​the first valve plate group 21 and the second valve plate group 22.

[0040] Specifically, such as Figure 1 and Figure 3 As shown, the inner diameter of the base flow channel 16 is smaller than the inner diameter of the second flow channel 15.

[0041] In this embodiment, as Figure 1-4 and Figure 6 As shown, since the base flow channel 16 is located outside the radial coverage area of ​​the first valve plate group 21 and the second valve plate group 22, the hydraulic oil can bypass the valve plate 31 and flow directly, ensuring the operation of the shock absorber under low-speed conditions. The inner diameter of the base flow channel 16 is smaller than the inner diameter of the second flow channel 15, which limits the flow rate of hydraulic oil through the base flow channel 16. When the shock absorber operates at a high flow rate, the hydraulic oil mainly flows through the first flow channel 14 and the second flow channel 15. At this time, the influence of the base flow channel 16 on the overall damping characteristics is relatively small.

[0042] Specifically, such as Figure 1-5 and Figure 7As shown, the first flow channel 14 includes a plurality of through first guide holes 141 spaced apart along the circumferential direction of the piston 1, and a fan-shaped guide groove 142 disposed on the first end face 12 of the piston 1 and connected to the first guide holes 141. The fan-shaped guide groove 142 corresponds one-to-one with the first guide holes 141.

[0043] The inlet end of the first guide hole 141 is located within the coverage area of ​​the first valve plate group 21, and the outlet end of the first guide hole 141 is located within the coverage area of ​​the second valve plate group 22.

[0044] The fan-shaped drainage channel 142 is provided with a connecting part and an edge part. The connecting part of the fan-shaped drainage channel 142 is connected to the corresponding first guide hole 141 and is located within the coverage area of ​​the first valve plate group 21. The edge part of the fan-shaped drainage channel 142 extends outside the coverage area of ​​the first valve plate group 21.

[0045] In this embodiment, as Figure 4 and Figure 6 As shown, during operation, hydraulic oil first enters through the fan-shaped guide groove 142 connected to the inlet end of the first guide hole 141. Since the outlet end is located within the coverage area of ​​the second valve plate group 22, the hydraulic oil pressure pushes the second valve plate group 22 to deform, forming a flow gap. The oil then flows out through the flow gap.

[0046] Specifically, such as Figure 1-7 As shown, the second flow channel 15 includes a plurality of through second flow guide holes 151 spaced apart along the circumferential direction of the piston 1, and a flow guide groove 152 disposed on the second end face 13 of the piston 1 and connected to the second flow guide holes 151. The flow guide groove 152 corresponds one-to-one with the second flow guide holes 151.

[0047] The inlet end of the second guide hole 151 is located within the coverage area of ​​the second valve plate group 22, and the outlet end of the second guide hole 151 is located within the coverage area of ​​the first valve plate group 21.

[0048] The flow channel 152 includes a connecting portion and an edge portion. The connecting portion communicates with the corresponding second flow hole 151 and is located within the coverage area of ​​the second valve plate group 22, while the edge portion extends beyond the coverage area of ​​the second valve plate group 22.

[0049] In this embodiment, as Figure 4 and Figure 6 As shown, during operation, hydraulic oil enters through the guide groove 152 connected to the inlet end of the second guide hole 151. Since the outlet end is located within the coverage area of ​​the first valve plate group 21, the hydraulic oil pressure pushes the first valve plate group 21 to deform, forming a flow gap. The hydraulic oil flows out through the flow gap.

[0050] Specifically, such as Figure 1-7As shown, the second valve plate group 22 includes seven coaxially stacked valve plates 31, and the outer diameter of the valve plates 31 decreases sequentially from the side closer to the piston 1 to the side farther away from the piston 1.

[0051] Specifically, such as Figure 2 and Figure 4 as well as Figure 6 As shown, the first valve plate group 21 includes eight coaxially stacked valve plates 31.

[0052] In this embodiment, as Figure 2 and Figure 4 as well as Figure 6 As shown, the first valve plate group 21 and the second valve plate group 22 can adjust the basic damping by modifying the number of stacked valve plates 31.

[0053] The specific embodiments described above further illustrate the technical problems, technical solutions, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A passive damping valve for a motor vehicle shock absorber for mounting on a piston rod of a shock absorber, characterized in that include: A piston (1) has an axial mounting through hole (11) at its center, which is suitable for mounting on the piston rod. The piston (1) has a first end face (12) and a second end face (13) arranged opposite to each other. The piston (1) has a plurality of first flow channels (14) and at least one second flow channel (15) that pass through the first end face (12) and the second end face (13), wherein the number of first flow channels (14) is greater than the number of second flow channels (15). The first valve plate group (21) and the second valve plate group (22) are provided with positioning holes (23) coaxial with the axial mounting through hole (11) at their center positions. The first valve plate group (21) is fixed to the first end face (12) of the piston (1) and completely covers the outlet of the first flow channel (14) and partially covers the inlet of the second flow channel (15). The second valve plate group (22) is fixed to the second end face (13) of the piston (1) and completely covers the outlet of the second flow channel (15) and partially covers the inlet of the first flow channel (14). A pair of fixing blocks (4), the fixing blocks (4) having mounting holes (41) coaxial with the axial mounting through hole (11), the fixing blocks (4) being respectively mounted on the first end face (12) and the second end face (13) of the piston (1), the fixing blocks (4) being adapted to fix the corresponding first valve plate group (21) and the second valve plate group (22); When the first valve plate group (21) is deformed by the fluid pressure from the first flow channel (14), it is adapted to form a flow gap from the second end face (13) to the first end face (12); when the second valve plate group (22) is deformed by the fluid pressure from the second flow channel (15), it forms a flow gap from the first end face (12) to the second end face (13).

2. The passive damping valve for automotive shock absorbers according to claim 1, characterized in that, It also includes a base flow channel (16), which penetrates the first end face (12) of the piston (1) and the inlet of the second flow channel (15), and the base flow channel (16) is located outside the radial coverage range of the first valve plate group (21) and the second valve plate group (22).

3. The passive damping valve for automotive shock absorbers according to claim 2, characterized in that, The inner diameter of the base flow channel (16) is smaller than the inner diameter of the second flow channel (15).

4. The passive damping valve for automotive shock absorbers according to claim 1, characterized in that, The first flow channel (14) includes a plurality of through first flow guide holes (141) spaced apart along the circumferential direction of the piston (1), and a fan-shaped flow guide groove (142) disposed on the first end face (12) of the piston (1) and connected to the first flow guide holes (141), wherein the fan-shaped flow guide groove (142) corresponds one-to-one with the first flow guide holes (141); The inlet end of the first guide hole (141) is located within the coverage area of ​​the first valve plate group (21), and the outlet end of the first guide hole (141) is located within the coverage area of ​​the second valve plate group (22). The fan-shaped drainage channel (142) is provided with a connecting part and an edge part. The connecting part of the fan-shaped drainage channel (142) is connected to the corresponding first guide hole (141) and is located in the coverage area of ​​the first valve plate group (21). The edge part of the fan-shaped drainage channel (142) extends to the outside of the coverage area of ​​the first valve plate group (21).

5. The passive damping valve for automotive shock absorbers according to claim 1, characterized in that, The second flow channel (15) includes a plurality of through second flow guide holes (151) spaced apart along the circumferential direction of the piston (1), and a flow guide groove (152) disposed on the second end face (13) of the piston (1) and communicating with the second flow guide holes (151), wherein the flow guide groove (152) corresponds one-to-one with the second flow guide holes (151); The inlet end of the second guide hole (151) is located within the coverage area of ​​the second valve plate group (22), and the outlet end of the second guide hole (151) is located within the coverage area of ​​the first valve plate group (21). The flow channel (152) includes a connecting portion and an edge portion. The connecting portion communicates with the corresponding second flow hole (151) and is located within the coverage area of ​​the second valve plate group (22). The edge portion extends outside the coverage area of ​​the second valve plate group (22).

6. The passive damping valve for automotive shock absorbers according to claim 1, characterized in that, The second valve plate group (22) includes a plurality of coaxially stacked valve plates (31), the outer diameter of which decreases sequentially from the side closer to the piston (1) to the side farther away from the piston (1).

7. The passive damping valve for automotive shock absorbers according to claim 1, characterized in that, The first valve plate group (21) includes eight coaxially stacked valve plates (31).

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