Dual valve shock absorber and vehicle

Abstract

The utility model relates to a kind of double valve shock absorber and vehicle, double valve shock absorber includes inner tube, intermediate cylinder, outer tube, first damping device, second damping device and the piston placed in inner tube, piston will the inner cavity of inner tube be divided into rodless chamber and rod chamber, intermediate cylinder and outer tube between being equipped with the balance chamber for accommodating gas and hydraulic medium, double valve shock absorber further include the first base and second base of hydraulic connection inner tube, intermediate cylinder, outer tube, first damping device, second damping device, first damping device is connected with rodless chamber and balance chamber by first base and second base and hydraulic pressure, second damping device is connected with rod chamber and balance chamber by first base and second base and hydraulic pressure, so that first damping device and second damping device can be placed in same axial position.The utility model places two damping devices in same axial position by first base and second base, reduces the number of intermediate cylinder, make structure more compact, applicable to the scene of limited installation space.

Description

Technical Field

[0001] This utility model relates to a dual-valve vibration damper, and more particularly to a compact dual-valve damper. Background Technology

[0002] Dual-valve shock absorbers have been widely used in various fields in recent years due to their excellent performance in vibration reduction and energy absorption. For example, in automotive shock absorption systems, dual-valve shock absorbers can improve vehicle handling and comfort by adjusting the damping force at different stages.

[0003] However, dual-valve shock absorbers typically employ a three-layer cylindrical structure. To achieve communication between different cavities, two separate intermediate cylinders are usually required. This results in the two damping devices being installed in a staggered manner in the axial direction, leading to larger radial and axial dimensions at the installation positions of the damping devices. Consequently, dual-valve shock absorbers are often limited in application in scenarios with limited installation space, such as automobiles. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide an improved dual-valve vibration damper, which has a simple structure and can realize the installation of two damping devices in the same axial position.

[0005] To address the aforementioned technical problems, this utility model provides a dual-valve vibration damper, comprising: an inner cylinder, an intermediate cylinder, an outer cylinder, a first damping device, a second damping device, and a piston disposed within the inner cylinder. The piston divides the inner cylinder's cavity into a rodless chamber and a rod chamber. A balance chamber for accommodating gas and hydraulic media is provided between the intermediate cylinder and the outer cylinder. In this utility model, the dual-valve vibration damper further includes a first base and a second base hydraulically connecting the inner cylinder, intermediate cylinder, outer cylinder, first damping device, and second damping device. The first damping device is hydraulically connected to the rodless chamber and the balance chamber via the first and second bases, and the second damping device is hydraulically connected to the rod chamber and the balance chamber via the first and second bases, thereby enabling the first and second damping devices to be installed in the same axial position. In this utility model, the first and second damping devices being installed in the same axial position means that they do not need to be completely misaligned; they can partially or completely overlap axially. It does not mean that the first and second damping devices must be completely overlapped. The dual-valve vibration damper has the most compact axial dimensions when the first and second damping devices are completely aligned axially. In some applications, the first and second damping devices can also be installed with axial misalignment by adjusting the axial dimensions of the first base.

[0006] According to a preferred embodiment of the present invention, the first damping device includes a first port and a second port, and the second damping device includes a third port and a fourth port. The first port is hydraulically connected to the rodless chamber, the third port is hydraulically connected to the rod-type chamber via a connecting cavity between the inner cylinder and the intermediate cylinder, and the second and fourth ports are respectively hydraulically connected to the balance chamber. The first and second damping devices can be designed as solenoid valves, and the "hardness" of the dual-valve vibration damper is controlled by adjusting the pressure drop generated by the first and second damping devices through current regulation.

[0007] According to a preferred embodiment of this utility model, the gap between the first base and the second base after assembly forms an intermediate cavity. The intermediate cavity and the connecting cavity are hydraulically connected through a first connecting hole, and the intermediate cavity and the third port are hydraulically connected through a second connecting hole. This independent intermediate cavity design achieves a simple hydraulic connection between the connecting cavity and the third port, while maintaining a good seal between the connecting cavity and other working cavities.

[0008] According to a preferred embodiment of this utility model, the second connecting hole is located on the first base. The first base also has a third connecting hole for hydraulically connecting the second port to the balance cavity and a fourth connecting hole for hydraulically connecting the fourth port to the balance cavity. The first base and the second base also have a fifth connecting hole and a sixth connecting hole for hydraulically connecting the first port to the rodless cavity, respectively. Through the above design, the first base and the second base achieve the connection of each cavity and port with a simple structure, and the first base and the second base constituting the intermediate cavity have a simple shape and low cost.

[0009] According to a preferred embodiment of the present invention, a first annular wall extending axially outward is provided at one axial end of the first base, and a second base is placed radially inside the first annular wall. By providing the first annular wall, the coaxiality of the second base can be ensured when installing the second base, and a radially outer seal can be provided for the intermediate cavity.

[0010] More preferably, a second annular wall that matches the shape of the first annular wall is provided on the radially outer side of the second base, and a sealing ring is placed between the second annular wall and the first annular wall. By providing the second annular wall, the sealing ring on the radially outer side of the first base and the second base can be placed between the first annular wall and the second annular wall to achieve a seal between the balance cavity and the intermediate cavity.

[0011] According to a preferred embodiment of this utility model, a base spacer is disposed between the first base and the second base to maintain the axial distance between the first base and the second base and to seal the radially inner side of the intermediate cavity. The base spacer is simple to process and assemble, and has good sealing performance. As an alternative, the first base and the second base can also be installed at an interval by setting a stepped surface at the bottom of the second base to ensure the axial space of the intermediate cavity. The installation positions of the first base and the second base on the radially inner side can be sealed by means of adhesive bonding or interference fit.

[0012] According to a preferred embodiment of this utility model, the first damping device includes a first base valve body and a first solenoid valve. When the hydraulic medium flows from the first port to the second port, the first base valve body and the first solenoid valve operate in series, and the pressure drop generated by the first base valve body is less than the pressure drop generated by the first solenoid valve. The second damping device includes a second base valve body and a second solenoid valve. When the hydraulic medium flows from the third port to the fourth port, the second base valve body and the second solenoid valve operate in series, and the pressure drop generated by the second base valve body is less than the pressure drop generated by the second solenoid valve. By setting an additional base valve body with a relatively small spring preload, the spring preload can be finely adjusted within a small range, thereby achieving precise adjustment of the pressure drop generated by the damping device. The base valve body can also be set only on the first damping device or the second damping device.

[0013] Furthermore, the aforementioned technical problems can also be solved by vehicles equipped with any of the aforementioned dual-valve shock absorbers. Due to the adoption of the aforementioned optimized, simple and compact dual-valve shock absorber, the vehicle can more flexibly arrange the dual-valve shock absorber at a lower cost when designing the suspension system. Attached Figure Description

[0014] The preferred embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. These preferred embodiments do not limit the overall concept of the present invention.

[0015] Figure 1 This is a cross-sectional view of a dual-valve vibration damper in the prior art; Figure 2 This is a cross-sectional view of a preferred embodiment of the present invention; Figure 3 This is a partial cross-sectional view of a preferred embodiment of the present invention; Figure 4 This is a cross-sectional view of the first damping device according to a preferred embodiment of the present invention.

[0016] In this utility model, unless otherwise specified, "axial", "radial" and "circumferential" are all relative to the dual-valve vibration damper. Detailed Implementation

[0017] Figure 1A prior art dual-valve vibration damper is shown, comprising an inner cylinder 3', two axially offset intermediate cylinders 4', an outer cylinder 5', a first damping device 6', a second damping device 7', and a piston 8'. The piston 8' divides the inner cylinder 3' into a lower rodless chamber 31' and an upper rod chamber 32'. The inner side of the outer cylinder 5' is a balance chamber 51' for storing or replenishing the hydraulic medium of each working chamber. Figure 1 As shown, in order to enable the first damping device 6' to be hydraulically connected to the rodless chamber 31' and the balance chamber 51' respectively, and the second damping device 7' to be hydraulically connected to the rod chamber 32' and the balance chamber 51' respectively, the dual-valve damper is provided with two intermediate cylinders 4'. Since the two intermediate cylinders 4' need to be arranged at intervals in the axial direction, the first damping device 6' and the second damping device 7' cannot be placed in the same axial position, resulting in a large axial dimension of the damping device installation position.

[0018] Figures 2 to 4 A preferred embodiment of the present invention is shown. For example... Figures 2 to 4 As shown, the dual-valve vibration damper designed according to this utility model includes an inner cylinder 3, an intermediate cylinder 4, an outer cylinder 5, a first damping device 6, a second damping device 7, a piston installed in the inner cylinder 3, and a first base and a second base that hydraulically connect the inner cylinder 3, the intermediate cylinder 4, the outer cylinder 5, the first damping device 6, and the second damping device 7. The piston 8 divides the inner cylinder 3 of the dual-valve vibration damper radially inward into a lower rodless cavity 31 and an upper rod cavity 32. The rod cavity 32 is hydraulically connected to the connecting cavity 41 between the inner cylinder 3 and the intermediate cylinder 4 through a seventh connecting hole 33 on the inner cylinder 3. The intermediate cylinder 4 and the outer cylinder 5 are connected to a balance cavity 51 for containing gas and hydraulic media. The first damping device 6 includes a first port 61 and a second port 62. The second damping device 7 includes a third port 71 and a fourth port 72. The first port 61 is hydraulically connected to the rodless cavity 31, the third port 71 is hydraulically connected to the connecting cavity 41, and the second port 62 and the fourth port 72 are hydraulically connected to the balance cavity 51, respectively. With the first base 1 and the second base 2, the first damping device 6 and the second damping device 7 can be installed in the same axial position. Simultaneously, the number of intermediate cylinders 4 is reduced from two to one, decreasing the number of parts, simplifying assembly, and helping to control costs. In this invention, "the first damping device 6 and the second damping device 7 can be installed in the same axial position" means that the first damping device 6 and the second damping device 7 do not need to be completely misaligned; they can partially or completely overlap axially. It does not mean that the first damping device 6 and the second damping device 7 must be completely overlapped. When the first damping device 6 and the second damping device 7 are completely overlapped axially, the axial dimensions of the dual-valve vibration damper are the most compact. In some applications, the axial misalignment of the first damping device 6 and the second damping device 7 can also be achieved by adjusting the axial dimensions of the first base.

[0019] like Figure 2 and Figure 3 As shown, the gap between the first base 1 and the second base 2 after assembly forms an intermediate cavity 21. The intermediate cavity 21 is hydraulically connected to the connecting cavity 41 through a first connecting hole 22, and the intermediate cavity 21 is hydraulically connected to the third port 71 through a second connecting hole 101. Through this design, the bottom end of the connecting cavity 41 is achieved in a simple form with an independent intermediate cavity 21. Figure 2 and Figure 3 The hydraulic connection between the lower end of the cavity 41 and the third port 71, while maintaining a good seal between the connecting cavity 41 and other working cavities.

[0020] like Figure 2 and Figure 3 As shown, the first base 1 has a third connecting hole 102 for hydraulically connecting the second port 62 to the balance cavity 51, a second connecting hole 101 for hydraulically connecting the third port 71 to the intermediate cavity 21, and a fourth connecting hole 103 for hydraulically connecting the fourth port 72 to the balance cavity 51. The first base 1 and the second base 2 also have a fifth connecting hole 104 and a sixth connecting hole 23 for hydraulically connecting the first port 61 to the rodless cavity 31, respectively. Through the above design, the first base 1 and the second base 2 achieve the connection of each cavity and port with a simple structure. Furthermore, the first base 1 and the second base 2 constituting the intermediate cavity 21 have a simple shape and can be processed separately and then assembled, resulting in low cost.

[0021] During the compression stroke of the dual-valve damper, the piston 8 moves downward. The hydraulic medium in the rodless chamber 31 enters the first port 61 of the first damping device 6 through the sixth connecting hole 23 and the fifth connecting hole 104. After generating a large pressure drop, it flows out from the second port 62 and enters the balance chamber 51 through the third connecting hole 102. The hydraulic medium in the balance chamber 51 enters the fourth port 72 of the second damping device 7 through the fourth connecting hole 103. After generating a small pressure drop, it flows out from the third port 71, enters the connecting chamber 41 through the second connecting hole 101, the intermediate chamber 21, and the first connecting hole 22, and then enters the rod chamber 32 through the seventh connecting hole 33. During the rebound stroke of the dual-valve damper, the piston 8 moves upward. The hydraulic medium in the rod chamber 32 enters the connecting chamber 41 through the seventh connecting hole 33, and then enters the third port 71 of the second damping device 7 after passing through the first connecting hole 22, the intermediate chamber 21, and the second connecting hole 101. After generating a large pressure drop, it flows out from the fourth port 72 and enters the balance chamber 51 through the fourth connecting hole 103. The hydraulic medium in the balance chamber 51 enters the second port 62 of the first damping device 6 through the third connecting hole 102. After generating a small pressure drop, it flows out from the first port 61 and enters the rodless chamber 31 through the fifth connecting hole 104 and the sixth connecting hole 23.

[0022] like Figure 2 and Figure 3As shown, in a preferred embodiment, a base spacer 10 is disposed between the first base 1 and the second base 2 to maintain the axial distance between the first base 1 and the second base 2 and to seal the radially inner side of the intermediate cavity 21. In other embodiments, the first base 1 and the second base 2 can be installed at an interval by providing a stepped surface at the bottom of the second base 2 to ensure the axial space of the intermediate cavity 21. The installation positions of the first base 1 and the second base 2 on the radially inner side can be sealed by means of adhesive bonding or interference fit. The implementation of the base spacer 10 is simpler to process and assemble, and has better sealing performance.

[0023] like Figure 2 and Figure 3 As shown, in a preferred embodiment, the first base 1 has a first annular wall 105 extending axially outward at one axial end. A second base 2 is placed radially inner to the first annular wall 105, and a second annular wall 24, matching the shape of the first annular wall 105, is placed radially outer to the second base 2. A sealing ring 9 is placed between the second annular wall 24 and the first annular wall 105. By providing the second annular wall 24, the sealing ring 9 on the radially outer sides of the first base 1 and the second base 2 can be placed between the first annular wall 105 and the second annular wall 24, achieving a seal between the balance cavity 51 and the intermediate cavity 21.

[0024] like Figure 2 and Figure 4 As shown, in a preferred embodiment, the first damping device 6 includes a first base valve body 63 and a first solenoid valve 64. When the hydraulic medium flows from the first port 61 to the second port 62, the first base valve body 63 and the first solenoid valve 64 operate in series, and the pressure drop generated by the first base valve body 63 is less than the pressure drop generated by the first solenoid valve 64. The second damping device 7 includes a second base valve body 73 and a second solenoid valve 74. When the hydraulic medium flows from the third port 71 to the fourth port 72, the second base valve body 73 and the second solenoid valve 74 operate in series, and the pressure drop generated by the second base valve body 73 is less than the pressure drop generated by the second solenoid valve 74. In the damping devices 6 and 7 of the dual-valve vibration damper, the spring preload or stiffness of the solenoid valves 64 and 74 typically affects the damping force of the damper by several hundred Newtons. Therefore, it is difficult to precisely adjust the pressure drop generated by the damping devices 6 and 7. By setting additional base valve bodies 63 and 73 with relatively small spring preloads, the spring preload can be finely adjusted within a range of, for example, a few Newtons (e.g., by setting springs with different preloads or stiffnesses), thereby achieving precise adjustment of the pressure drop generated by the damping devices 6 and 7. In other embodiments, base valve bodies 63 and 73 may be provided only on the first damping device 6 or the second damping device 7.

[0025] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

[0026] List of reference numerals 1. First base 101 Second connecting hole 102 Third connecting hole 103 Fourth connecting hole 104 Fifth connecting hole 105 First Ring Wall 2 Second base 21 intermediate cavity 22 First connecting hole 23 Sixth connecting hole 24 Second Ring Wall 3, 3' inner cylinder 31, 31' rodless cavity 32, 32' rod-shaped cavity 33 Seventh connecting hole 4, 4' intermediate tube 41 Connecting cavity 5. 5' outer cylinder 51, 51' balance chamber 6, 6' First damping device 61 First Port 62 Second Port 63 First Basic Valve Body 64 First Solenoid Valve 7, 7' Second damping device 71 Third Port 72 fourth port 73 Second Basic Valve Body 74 Second Solenoid Valve 8, 8' piston 9 sealing rings 10 base spacers

Claims

1. A dual-valve vibration damper, comprising an inner cylinder (3), an intermediate cylinder (4), an outer cylinder (5), a first damping device (6), a second damping device (7), and a piston (8) disposed within the inner cylinder (3), wherein, The piston (8) divides the inner cavity of the inner cylinder (3) into a rodless cavity (31) and a rod cavity (32). A balance cavity (51) for accommodating gas and hydraulic medium is provided between the intermediate cylinder (4) and the outer cylinder (5). The dual-valve damper also includes a first base (1) and a second base (2) that hydraulically connect the inner cylinder (3), the intermediate cylinder (4), the outer cylinder (5), the first damping device (6), and the second damping device (7). The first damping device (6) is hydraulically connected to the rodless cavity (31) and the balance cavity (51) through the first base (1) and the second base (2). The second damping device (7) is hydraulically connected to the rod cavity (32) and the balance cavity (51) through the first base (1) and the second base (2), so that the first damping device (6) and the second damping device (7) can be placed in the same axial position.

2. The dual-valve vibration damper according to claim 1, characterized in that, The first damping device (6) includes a first port (61) and a second port (62), and the second damping device (7) includes a third port (71) and a fourth port (72). The first port (61) is hydraulically connected to the rodless cavity (31), the third port (71) is hydraulically connected to the rod cavity (32) through the connecting cavity (41) between the inner cylinder (3) and the intermediate cylinder (4), and the second port (62) and the fourth port (72) are respectively hydraulically connected to the balance cavity (51).

3. The dual-valve vibration damper according to claim 2, characterized in that, The first base (1) and the second base (2) form an intermediate cavity (21) after assembly.

4. The dual-valve vibration damper according to claim 3, characterized in that, The intermediate cavity (21) and the connecting cavity (41) are hydraulically connected through the first connecting hole (22), and the intermediate cavity (21) and the third port (71) are hydraulically connected through the second connecting hole (101).

5. The dual-valve vibration damper according to claim 4, characterized in that, The second connecting hole (101) is located on the first base (1). The first base (1) also has a third connecting hole (102) that hydraulically connects the second port (62) to the balance cavity (51) and a fourth connecting hole (103) that hydraulically connects the fourth port (72) to the balance cavity (51). The first base (1) and the second base (2) also have a fifth connecting hole (104) and a sixth connecting hole (23) that hydraulically connect the first port (61) to the rodless cavity (31).

6. The dual-valve vibration damper according to claim 4, characterized in that, The first base (1) has an axially outwardly extending first annular wall (105) at one axial end, and the second base (2) is arranged radially inside the first annular wall (105).

7. The dual-valve vibration damper according to claim 6, characterized in that, The second base (2) has a second annular wall (24) on the radially outer side that matches the shape of the first annular wall (105), and a sealing ring (9) is placed between the second annular wall (24) and the first annular wall (105).

8. The dual-valve vibration damper according to claim 4, characterized in that, A base spacer (10) is disposed between the first base (1) and the second base (2) to maintain the axial distance between the first base (1) and the second base (2) and to seal the radially inner side of the intermediate cavity (21).

9. The dual-valve vibration damper according to any one of claims 2 to 8, characterized in that, The first damping device (6) includes a first base valve body (63) and a first solenoid valve (64). When the hydraulic medium flows from the first port (61) to the second port (62), the first base valve body (63) and the first solenoid valve (64) work in series. The pressure drop generated by the first base valve body (63) is less than the pressure drop generated by the first solenoid valve (64). The second damping device (7) includes a second base valve body (73) and a second solenoid valve (74). When the hydraulic medium flows from the third port (71) to the fourth port (72), the second base valve body (73) and the second solenoid valve (74) work in series. The pressure drop generated by the second base valve body (73) is less than the pressure drop generated by the second solenoid valve (74).

10. A vehicle having a dual-valve shock absorber according to any one of claims 1-9.

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