Shock absorber and vehicle

Abstract

The utility model discloses a kind of shock absorber and vehicle, shock absorber includes: cylinder body assembly, piston rod assembly and damping adjusting valve assembly, damping adjusting valve assembly is installed in the outer circumferential wall of cylinder body assembly and includes valve seat and valve body assembly, valve seat includes first valve seat end wall, first valve seat end wall is connected in the axial direction of valve seat circumferential wall and near one side of working cavity, valve body assembly includes the limiting convex ring being set around valve body assembly, limiting convex ring and first valve seat end wall are in the axial direction of valve body assembly and abut, the outer circumferential side of valve body assembly and valve seat circumferential wall between define oil return passage, oil return passage is located in the axial direction of limiting convex ring and deviates from the side of first valve seat end wall, limiting convex ring is formed with valve oil outlet hole, at least part of valve oil outlet hole is staggered with first valve seat end wall and is used to communicate oil return passage with lower working cavity. According to the shock absorber of the utility model embodiment, the axial height of damping adjusting valve assembly can be shortened, and vehicle assembly interference can be avoided.

Description

Technical Field

[0001] This utility model relates to the field of vehicles, and in particular to a shock absorber and a vehicle. Background Technology

[0002] The vehicle's suspension is equipped with shock absorbers, which include damping adjustment valves. These valves regulate the flow of damping oil to adjust the damping capacity of the piston rod assembly, thereby reducing the impact of vehicle bumps on the cab during driving. The damping adjustment valve typically includes an inlet passage, a throttling passage, and a return passage. The damping oil in the cylinder block enters the throttling passage through the inlet passage, is throttled there, and then returns to the cylinder block through the return passage. The damping adjustment valve is usually fixed to the outer wall of the cylinder block assembly via a valve seat.

[0003] In related technologies, to ensure communication between the return oil passage within the damping regulating valve and the cylinder block, the valve seat of the damping regulating valve is typically spaced apart from the valve body assembly located within the valve seat in the axial direction to form a valve outlet passage. However, this arrangement increases the axial dimension of the damping regulating valve. Consequently, when installing a shock absorber with this damping regulating valve into a vehicle, it can affect the layout of other structures near the shock absorber, potentially causing interference problems. Therefore, improvements are needed. Utility Model Content

[0004] This utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one objective of this utility model is to provide a shock absorber with a damping regulating valve assembly disposed on its outer side wall. By providing a valve oil outlet hole on a limiting protrusion ring of the valve body assembly, and by having the limiting protrusion ring directly abut against the end wall of the first valve seat, it is unnecessary to form a valve oil outlet channel by spaced at least a portion of the end wall of the first valve seat from the limiting protrusion ring. This reduces the axial length of the damping regulating valve assembly, lowers the possibility of interference between the damping regulating valve assembly and other structures on the vehicle, avoids assembly interference, and facilitates the layout of other structures near the shock absorber.

[0005] This utility model also proposes a vehicle that includes the above-mentioned shock absorber.

[0006] A vibration damper according to a first aspect of the present invention includes: a cylinder assembly defining a working chamber; a piston rod assembly movably disposed in the working chamber in a vertical direction, the piston rod assembly including a piston rod and a piston, the piston being sleeved on the outer periphery of the piston rod and dividing the working chamber into an upper working chamber and a lower working chamber disposed in a vertical direction; and a damping regulating valve assembly mounted on the outer periphery of the cylinder assembly and including a valve seat and a valve body assembly, the valve seat having an mounting cavity, the valve body assembly being disposed in the mounting cavity, the valve seat including a valve seat peripheral wall and a first valve seat end wall, the valve seat peripheral wall surrounding the outer periphery of the valve body assembly, and the first valve seat end wall being connected to a portion of the valve seat peripheral wall in an axial direction close to the working chamber. The valve body assembly is formed as an annular ring surrounding the valve body assembly. The valve body assembly includes a limiting protrusion ring surrounding the valve body assembly. The limiting protrusion ring abuts against the end wall of the first valve seat in the axial direction of the valve body assembly. An oil inlet channel is formed inside the valve body assembly, and the oil inlet channel communicates with the upper working chamber. An oil return channel is defined between the outer peripheral side of the valve body assembly and the peripheral wall of the valve seat. The oil return channel is located on the side of the limiting protrusion ring away from the end wall of the first valve seat in the axial direction. A valve outlet hole is formed on the limiting protrusion ring. At least a portion of the valve outlet hole is offset from the end wall of the first valve seat and is used to communicate the oil return channel and the lower working chamber. A throttling channel with an adjustable flow area is formed on the peripheral wall of the valve body assembly, and the throttling channel communicates the oil inlet channel and the oil return channel.

[0007] According to the present invention, the damper has a damping regulating valve assembly provided on its outer side wall. By setting a valve oil outlet hole on the limiting protrusion ring of the valve body assembly and making the limiting protrusion ring directly abut against the end wall of the first valve seat, it is not necessary to form a valve oil outlet channel by separating at least a portion of the end wall of the first valve seat from the limiting protrusion ring. This reduces the length of the damping regulating valve assembly in the axial direction, reduces the possibility of interference between the damping regulating valve assembly and other structures on the vehicle, avoids vehicle assembly interference, and is beneficial to the layout of other structures near the damper.

[0008] According to some embodiments of the present invention, the valve oil outlet hole penetrates the outer peripheral surface of the limiting protrusion ring; or, the valve oil outlet hole is spaced apart from the outer peripheral surface of the limiting protrusion ring.

[0009] According to some embodiments of the present invention, a plurality of valve oil outlet holes are formed on the limiting protrusion ring, and the plurality of valve oil outlet holes are arranged at intervals along the circumferential direction of the limiting protrusion ring; and / or, the surface of the first valve seat end wall facing the limiting protrusion ring is a first surface, and the first surface is an annular shape extending along the circumferential direction of the limiting protrusion ring.

[0010] According to some embodiments of this utility model, the portion of the limiting protrusion ring that contacts the end wall of the first valve seat is an abutment portion. The dimension of the abutment portion in the radial direction of the limiting protrusion ring is t3. There is a fitting gap between the outer peripheral surface of the limiting protrusion ring and the inner peripheral surface of the valve seat peripheral wall. The width dimension of the fitting gap in the radial direction of the limiting protrusion ring is t2. Wherein, the value of t2 ranges from 0.2 to 1.0 mm and / or t2 < t3.

[0011] According to some embodiments of the present invention, the cylinder assembly defines a working chamber, an intermediate chamber, and an oil reservoir that are spaced apart from each other. The intermediate chamber is located on the outer periphery of the working chamber, and the oil reservoir is located on the outer periphery of the intermediate chamber. The peripheral wall of the upper working chamber is provided with a working chamber oil outlet, which connects the upper working chamber and the intermediate chamber. The peripheral wall of the intermediate chamber is provided with an intermediate chamber oil outlet, and the peripheral wall of the oil reservoir is provided with an oil reservoir side hole. The oil reservoir side hole and the intermediate chamber oil outlet are located along the diameter of the cylinder assembly. The valve body assembly is arranged in a relatively opposite direction. One axial end of the valve body assembly extends into the oil storage chamber through the oil storage chamber side hole and is connected to the oil outlet hole of the intermediate chamber. The oil outlet hole of the intermediate chamber connects the oil inlet channel and the intermediate chamber. The valve seat is located outside the cylinder body assembly, and the first valve seat end wall is connected to the outer peripheral wall of the oil storage chamber. The inner peripheral side of the first valve seat end wall defines a valve seat bottom hole, which communicates with the oil storage chamber side hole. At least a portion of the valve outlet hole is opposite to and communicates with the valve seat bottom hole in the axial direction of the valve seat.

[0012] According to some embodiments of the present invention, the outer peripheral wall of the intermediate cavity is provided with a connector, the connector is located on the outer peripheral side of the oil outlet hole of the intermediate cavity and is arranged around the oil outlet hole of the intermediate cavity, one axial end of the valve body assembly is inserted into the connector, the outer peripheral wall of the valve body assembly forms a limiting boss, the limiting boss is located on the side of the connector away from the oil outlet hole of the intermediate cavity in the axial direction of the valve body assembly, at least a portion of the limiting boss is arranged opposite to the connector in the axial direction of the valve body assembly, and the limiting boss is located between the connector and the limiting protrusion ring, and the limiting protrusion ring protrudes out of the limiting boss in the radial outward direction of the valve body assembly.

[0013] According to some embodiments of the present invention, a sealing ring is provided between the inner peripheral wall of the connector and the outer peripheral wall of the valve body assembly; a receiving groove is formed on the outer peripheral wall of the valve body assembly, the receiving groove is arranged around the valve body assembly, the sealing ring is accommodated in the receiving groove, and the width of the receiving groove along the axial direction of the valve body assembly is greater than the width of the sealing ring along the axial direction of the valve body assembly in its natural state.

[0014] According to some embodiments of the present invention, the valve body assembly includes a valve body, a valve core, a valve cover, and a bridging seat. The bridging seat is connected to the oil outlet of the intermediate cavity and includes the limiting protrusion ring. The valve cover is located on the side of the bridging seat away from the oil outlet of the intermediate cavity in the axial direction, and the valve cover and the bridging seat abut against each other in the axial direction of the valve seat. The bridging seat and the valve cover have the oil inlet channel formed on them. The valve body is located on the side of the bridging seat away from the oil outlet of the intermediate cavity in the axial direction. At least a portion of the valve cover... The valve core is movably disposed within the valve body along the axial direction of the valve seat and located on the side of the valve cover away from the bridge seat in the axial direction. The valve core and the valve cover define the throttling channel. The valve body includes a first valve body portion and a second valve body portion arranged along the axial direction of the valve body. The first valve body portion is located on the side of the second valve body portion closer to the bridge seat. The first valve body portion is spaced apart from the peripheral wall of the valve seat to form the oil return channel. The second valve body portion is connected and fixed to the peripheral wall of the valve seat.

[0015] According to some embodiments of the present invention, a sealing protrusion is formed on the axial side of the bridging seat facing the valve cover. The sealing protrusion is annular and surrounds the oil inlet channel. The sealing protrusion abuts against the valve cover in the axial direction of the valve seat.

[0016] According to some embodiments of the present invention, in the direction from the bridging seat to the valve cover, the width of the sealing protrusion in the radial direction of the bridging seat gradually decreases.

[0017] A vehicle according to a second aspect of the present invention includes: an axle; a vehicle body; and a shock absorber according to a first aspect of the present invention, wherein one of the cylinder assembly and the piston rod assembly is connected to the axle, and the other of the cylinder assembly and the piston rod assembly is connected to the vehicle body.

[0018] The vehicle according to the present invention, by including the shock absorber according to the first aspect of the present invention, reduces the length of the damping adjustment valve assembly in its axial direction, which can reduce the possibility of interference between the damping adjustment valve assembly and other structures on the vehicle, avoid vehicle assembly interference, and facilitate the layout of other structures near the shock absorber.

[0019] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a partial cross-sectional view of a vibration damper according to some embodiments of the present invention; Figure 2 yes Figure 1 Enlarged view of point A in the image; Figure 3 yes Figure 1 Enlarged view of point B in the image; Figure 4 yes Figure 1 A diagram showing the fit between the valve seat and the bridge seat. Figure 5 yes Figure 4 A three-dimensional schematic diagram of the bridging connector in the diagram; Figure 6 yes Figure 5 Front view of the bridge connector; Figure 7 yes Figure 5 A cross-sectional view of the bridging seat in the middle; Figure 8 This is a diagram showing the fit between the valve seat and the bridge seat according to other embodiments of the present invention; Figure 9 yes Figure 8 A three-dimensional schematic diagram of the bridging connector in the diagram; Figure 10 yes Figure 9 Front view of the bridge connector; Figure 11 yes Figure 9 A cross-sectional view of the bridging seat in the diagram.

[0021] Figure label: 100. Vibration damper; 1. Cylinder block assembly; 12. Working chamber; 121. Upper working chamber; 122. Lower working chamber; 123. Oil outlet of working chamber; 13. Intermediate chamber; 131. Oil outlet of intermediate chamber; 132. Connector; 14. Oil reservoir; 141. Side hole of oil reservoir; 2. Piston rod assembly; 21. Piston rod; 22. Piston; 3. Damping regulating valve assembly; 31. Valve seat; 311. Mounting cavity; 312. Valve seat peripheral wall; 313. First valve seat end wall; 314. First surface; 315. Valve seat bottom hole; 32. Valve body assembly; 33. Bridging seat; 331. Limiting protrusion; 332. Valve oil outlet; 333. Oil return passage; 334. Fitting clearance; 335. Abutment part; 336. Limiting boss; 337. Receiving groove; 338. Sealing protrusion; 339. Second surface; 34. Valve core; 341. Throttling passage; 35. Valve cover; 351. Oil inlet passage; 36. Valve body; 361. First valve body part; 362. Second valve body part; 37. Sealing ring. Detailed Implementation

[0022] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0023] The following is for reference. Figures 1-11 A vibration damper 100 according to an embodiment of the present utility model is described.

[0024] Reference Figures 1-3 According to the first aspect of the present invention, the shock absorber 100 includes: a cylinder assembly 1, a piston rod assembly 2, and a damping regulating valve assembly 3.

[0025] The cylinder assembly 1 defines a working chamber 12. The piston rod assembly 2 is movably disposed in the working chamber 12 in the vertical direction. The piston rod assembly 2 includes a piston 22, a rod 21, and a piston 22. The piston 22 is sleeved on the outer periphery of the piston 22 rod 21 and divides the working chamber 12 into an upper working chamber 121 and a lower working chamber 122 disposed in the vertical direction.

[0026] The damping regulating valve assembly 3 is mounted on the outer peripheral wall of the cylinder assembly 1 and includes a valve seat 31 and a valve body assembly 32. The valve seat 31 has a mounting cavity 311, and the valve body assembly 32 is disposed in the mounting cavity 311. The valve seat 31 includes a valve seat peripheral wall 312 and a first valve seat end wall 313. The valve seat peripheral wall 312 surrounds the outer peripheral side of the valve body assembly 32, and the first valve seat end wall 313 is connected to the side of the valve seat peripheral wall 312 in the axial direction near the working cavity 12 and is formed as an annulus surrounding the valve body assembly 32. The valve body assembly 32 includes a limiting protrusion 331 surrounding the valve body assembly 32. The limiting protrusion 331 abuts against the first valve seat end wall 313 in the axial direction of the valve body assembly 32. An oil inlet channel 351 is formed inside the valve body assembly 32, which communicates with the upper working chamber 121. An oil return channel 333 is defined between the outer peripheral side of the valve body assembly 32 and the valve seat peripheral wall 312. The oil return channel 333 is located on the side of the limiting protrusion 331 away from the first valve seat end wall 313 in the axial direction. A valve outlet hole 332 is formed on the limiting protrusion 331. At least a portion of the valve outlet hole 332 is offset from the first valve seat end wall 313 and is used to connect the oil return channel 333 and the lower working chamber 122. A throttling channel 341 with an adjustable flow area is formed on the peripheral wall of the valve body assembly 32, which connects the oil inlet channel 351 and the oil return channel 333.

[0027] For example, the valve seat 31 and the valve body assembly 32 are connected by threads. When assembling the damping regulating valve assembly 3 with the cylinder assembly 1, the first valve seat end wall 313 of the valve seat 31 is first welded to the cylinder assembly 1. Then, the valve body assembly 32 is inserted into the valve body 36 from the side of the valve seat 31 away from the cylinder assembly 1 in the axial direction. While rotating the valve body assembly 32, the valve body assembly 32 is moved toward the cylinder assembly 1 until the limiting protrusion 331 and the first valve seat end wall 313 abut against each other in the axial direction of the valve body assembly 32. Then the valve body assembly 32 is installed in place.

[0028] Reference Figure 2 , Figure 2 The dashed line in the figure represents the flow direction of the damping oil within the damping regulating valve assembly 3.

[0029] For example, when the shock absorber 100 is working, the piston 22 rod 21 drives the piston 22 to move upward, causing the volume of the upper working chamber 121 to decrease and the volume of the lower working chamber 122 to increase. The damping oil in the upper working chamber 121 enters the valve body assembly 32 through the oil inlet channel 351, and then enters the throttling channel 341. The valve body assembly 32 adjusts the flow area of ​​the throttling channel 341 to adjust the flow speed of the damping oil, thereby adjusting the magnitude of the damping force on the piston 22 assembly. After the damping oil flows out of the throttling channel 341, it enters the return oil channel 333, and then the damping oil leaves the return oil channel 333 through the valve outlet hole 332 on the limiting protrusion ring 331 and enters the lower working chamber 122.

[0030] For example, when the piston rod assembly 2 moves downward, the piston rod 21 drives the piston 22 to move downward. As the piston rod assembly 2 moves downward as a whole, the volume occupied by the piston rod assembly 2 in the working chamber 12 increases, resulting in a decrease in the volume of damping oil in the working chamber 12. The damping oil in the upper working chamber 121 enters the valve body assembly 32 through the oil inlet channel 351, and then enters the throttling channel 341. The valve body assembly 32 adjusts the flow area of ​​the throttling channel 341 to adjust the flow rate of the damping oil, thereby adjusting the magnitude of the damping force on the piston 22 assembly. After flowing out of the throttling channel 341, the damping oil enters the return oil channel 333, and then leaves the return oil channel 333 through the valve outlet hole 332 on the limiting protrusion ring 331 and enters the lower working chamber 122.

[0031] By making the first valve seat end wall 313 annular around the valve body assembly 32, the fixed connection between the first valve seat end wall 313 and the cylinder assembly 1 can be more complete, thereby improving the structural strength of the first valve seat end wall 313 and the reliability of the valve seat 31.

[0032] In related technologies, the circumferential portion of the first valve seat end wall 313 is axially away from the limiting protrusion ring 331 to form a valve oil outlet hole 332. In order to ensure smooth return of damping oil in the return oil channel 333, the length of the valve oil outlet hole 332 in the axial direction needs to be long enough, but this setting occupies too much space in the axial direction. By forming a valve outlet hole 332 on the limiting convex ring 331, the oil in the return oil channel 333 can flow back from the return oil channel 333 into the lower working chamber 122 through the valve outlet hole 332 on the limiting convex ring 331. In this way, the return oil flow rate can be adjusted by only adjusting the size of the valve outlet hole 332 on the limiting convex ring 331 in the radial direction. The flow rate of the valve outlet hole 332 is not restricted by the axial direction of the valve outlet hole 332. Therefore, while ensuring the smooth return of the damping oil flowing through the valve outlet hole 332, it is possible to avoid the valve outlet hole 332 occupying too much space in the axial direction, reduce the possibility of interference between the damping regulating valve assembly 3 and other structures on the vehicle, avoid vehicle assembly interference, and facilitate the layout of other structures near the shock absorber 100.

[0033] For example, the valve seat 31 is located on the outer periphery of the oil return channel 333. To ensure sufficient structural strength and prevent leakage, the valve seat 31 is typically manufactured using a cold forging process. However, to reduce costs, the limiting ring 331 housed within the valve seat 31 can be manufactured using powder metallurgy, formed by pressing and sintering with a powder metallurgy mold. Therefore, placing the valve outlet 332 on the limiting ring 331 is simpler and less costly than placing it on the valve seat 31.

[0034] By setting at least a portion of the valve outlet hole 332 to be offset from the first valve seat end wall 313, the first valve seat end wall 313 can be prevented from blocking the valve outlet hole 332, thus preventing the damping oil in the return oil channel 333 from flowing back to the lower working chamber 122, thereby connecting the valve outlet hole 332 with the return oil channel 333 and the lower working chamber 122.

[0035] By abutting the limiting protrusion 331 against the first valve seat end wall 313 in the axial direction of the valve body assembly 32, the limiting protrusion 331 and the valve seat 31 end wall can be directly connected. This eliminates the need for the valve outlet hole 332 between the limiting protrusion 331 and the first valve seat end wall 313, which occupies the axial length, as is done in related technologies. This reduces the length of the damping regulating valve assembly 3 in the axial direction, lowers the possibility of interference between the damping regulating valve assembly 3 and other structures on the vehicle, avoids vehicle assembly interference, and is beneficial for the layout of other structures near the shock absorber 100.

[0036] According to the present invention, the damper 100 has a damping regulating valve assembly 3 provided on its outer side wall. By providing a valve oil outlet hole 332 on the limiting protrusion 331 of the valve body assembly 32 and making the limiting protrusion 331 directly abut against the first valve seat end wall 313, it is not necessary to form a valve oil outlet channel by spaced apart from at least a portion of the first valve seat end wall 313 and the limiting protrusion 331. This reduces the length of the damping regulating valve assembly 3 in the axial direction, which can reduce the possibility of interference between the damping regulating valve assembly 3 and other structures on the vehicle, avoid vehicle assembly interference, and facilitate the layout of other structures near the damper 100.

[0037] According to some embodiments of the present invention, the valve oil outlet 332 penetrates the outer peripheral surface of the limiting protrusion ring 331; or, the valve oil outlet 332 is spaced apart from the outer peripheral surface of the limiting protrusion ring 331.

[0038] For example, refer to Figures 4-7 The valve oil outlet 332 penetrates the outer peripheral surface of the limiting protrusion ring 331. A portion of the valve oil outlet 332 is offset from the first valve seat end wall 313 to avoid the first valve seat end wall 313 completely blocking the valve oil outlet 332.

[0039] For example, refer to Figures 8-11 The valve oil outlet 332 is spaced apart from the outer peripheral surface of the limiting protrusion ring 331, and the valve oil outlet 332 is completely offset from the end wall 313 of the first valve seat.

[0040] By allowing the valve oil outlet 332 to penetrate the outer peripheral surface of the limiting protrusion ring 331, the opening length of the valve oil outlet 332 in the radial direction can be increased, and the opening area of ​​the valve oil outlet 332 can be increased, allowing the damping oil to smoothly return to the lower working chamber 122 through the valve oil outlet 332. By separating the valve oil outlet 332 from the outer peripheral surface of the limiting protrusion ring 331, the limiting protrusion ring 331 can form a complete ring on the outside of the valve oil outlet 332, increasing the contact area between the limiting protrusion ring 331 and the first valve seat end wall 313, and making the contact between the limiting protrusion ring 331 and the first valve seat end wall 313 more sufficient.

[0041] Reference Figure 6 and Figure 10 According to some embodiments of this utility model, a plurality of valve oil outlet holes 332 are formed on the limiting protrusion ring 331, and the plurality of valve oil outlet holes 332 are arranged at intervals along the circumference of the limiting protrusion ring 331. By forming a plurality of valve oil outlet holes 332 on the limiting protrusion ring 331, and arranging the plurality of valve oil outlet holes 332 at intervals along the circumference of the limiting protrusion ring 331, the total area on the limiting protrusion ring 331 for the flow of damping oil can be increased, so that the damping oil can flow smoothly back to the lower working chamber 122, and the problem of difficulty in oil return caused by blockage of a single valve oil outlet hole 332 can be reduced.

[0042] Reference Figure 2 According to some embodiments of this utility model, the surface of the first valve seat end wall 313 facing the limiting protrusion ring 331 is the first surface 314, which is an annular shape extending along the circumferential direction of the limiting protrusion ring 331. By making the first surface 314 an annular shape extending along the circumferential direction of the limiting protrusion ring 331, that is, the first surface 314 abuts against the limiting protrusion ring 331 in the circumferential direction, there is no need for the first surface 314 to form a valve oil outlet hole 332 occupying the axial length, as is done in related technologies. This reduces the possibility of interference between the damping regulating valve assembly 3 and other structures on the vehicle, avoids vehicle assembly interference, and is beneficial to the layout of other structures near the shock absorber 100.

[0043] Reference Figure 2 According to some embodiments of the present invention, there is a fitting gap 334 between the outer peripheral surface of the limiting protrusion ring 331 and the inner peripheral surface of the valve seat peripheral wall 312. The width dimension of the fitting gap 334 in the radial direction of the limiting protrusion ring 331 is t2, wherein the value of t2 ranges from 0.2 to 1.0 mm.

[0044] When connecting the valve body assembly 32 to the cylinder assembly 1, in order to ensure a seal between the outer peripheral wall of the valve body assembly 32 and the outer peripheral wall of the cylinder assembly 1, a connector 132 is usually provided on the cylinder assembly 1, and the side of the valve body assembly 32 closest to the cylinder assembly 1 is connected to the connector 132. During actual installation and fixing, the axis of the connector 132 and the axis of the valve seat 31 may not necessarily be completely coincident. By making the width dimension t2 of the fitting clearance 334 in the radial direction of the limiting protrusion ring 331 range from 0.2 to 1.0 mm, the connector 132 and the valve body assembly 32 can be concentrically arranged, ensuring a good sealing effect between the valve body assembly 32 and the cylinder assembly 1. This also allows the valve body assembly 32 and the valve seat 31 to be misaligned, enabling the first valve seat end wall 313 to fully abut against the limiting protrusion ring 331 and simplifying the installation of the valve body assembly 32 and the valve seat 31.

[0045] Reference Figure 2According to some embodiments of this utility model, the portion of the limiting protrusion 331 that contacts the first valve seat end wall 313 is an abutment portion 335. The radial dimension of the abutment portion 335 in the limiting protrusion 331 is t3. There is a fitting gap 334 between the outer peripheral surface of the limiting protrusion 331 and the inner peripheral surface of the valve seat peripheral wall 312. The width dimension of the fitting gap 334 in the radial direction of the limiting protrusion 331 is t2, where t2 < t3. By making the width dimension t2 of the fitting gap 334 in the radial direction of the limiting protrusion 331 smaller than the dimension t3 of the abutment portion 335 in the radial direction of the limiting protrusion 331, the limiting protrusion 331 can fully abut against the first valve seat end wall 313 in the circumferential direction, avoiding insufficient abutment or disengagement of the limiting protrusion 331 from the first valve seat end wall 313, which would cause the limiting protrusion 331 to fall off.

[0046] Reference Figure 1 and Figure 2 According to some embodiments of the present invention, the cylinder assembly 1 defines a working chamber 12, an intermediate chamber 13, and an oil storage chamber 14 that are spaced apart from each other. The intermediate chamber 13 is located on the outer periphery of the working chamber 12, and the oil storage chamber 14 is located on the outer periphery of the intermediate chamber 13. The peripheral wall of the upper working chamber 121 is provided with a working chamber oil outlet 123, which connects the upper working chamber 121 and the intermediate chamber 13. The peripheral wall of the intermediate chamber 13 is provided with an intermediate chamber oil outlet 131, and the peripheral wall of the oil storage chamber 14 is provided with an oil storage chamber side hole 141. The oil storage chamber side hole 141 and the intermediate chamber oil outlet 131 are located along the cylinder assembly. The cylinder body assembly 32 is radially opposite to the cylinder body assembly 1. One axial end of the valve body assembly 32 extends into the oil storage chamber 14 through the oil storage chamber side hole 141 and is connected to the intermediate chamber oil outlet hole 131. The intermediate chamber oil outlet hole 131 connects the oil inlet channel 351 and the intermediate chamber 13. The valve seat 31 is located outside the cylinder body assembly 1 and the first valve seat end wall 313 is connected to the outer peripheral wall of the oil storage chamber 14. The inner peripheral side of the first valve seat end wall 313 defines the valve seat bottom hole 315. The valve seat bottom hole 315 is connected to the oil storage chamber side hole 141. At least a portion of the valve outlet hole 332 is opposite to and connected to the valve seat bottom hole 315 in the axial direction of the valve seat 31.

[0047] By defining a mutually separated intermediate cavity 13 and working cavity 12 within the cylinder assembly 1, and connecting the intermediate cavity 13 and the upper working cavity 121 through an oil outlet, and connecting the oil outlet 131 of the intermediate cavity with the oil inlet channel 351 of the valve body assembly 32, the piston 22 head can fully seal against the inner wall of the working cavity 12 during the up-and-down movement of the piston rod assembly 2, thus avoiding affecting the sealing effect of the piston 22 head. At the same time, the damping oil in the working cavity 12 can enter the intermediate cavity 13 through the oil outlet, and then enter the valve body assembly 32 and be throttled by the valve body assembly 32.

[0048] By defining the valve seat bottom hole 315 on the inner circumferential side of the first valve seat end wall 313, and connecting the valve seat bottom hole 315 with the oil storage chamber side hole 141, the damping oil in the return oil channel 333 can pass through the valve outlet hole 332, and then pass through the valve seat bottom hole 315 and the oil storage chamber side hole 141 in sequence, and finally enter the oil storage chamber 14.

[0049] For example, the bottom wall of the lower working chamber 122 has a bottom channel that connects the lower working chamber 122 and the oil reservoir 14. The cylinder assembly 1 also includes a bottom valve, which is a one-way valve located in the bottom channel. The bottom valve allows damping oil to flow into the working chamber 12 only through the oil reservoir 14.

[0050] For example, the piston 22 has a piston 22 channel, which connects the upper working chamber 121 and the lower working chamber 122. The cylinder assembly 1 also includes a piston 22 valve, which is a one-way valve and is located in the piston 22 channel. The piston 22 valve allows the damping oil to flow into the upper working chamber 121 only through the lower working chamber 122.

[0051] For example, refer to Figure 2 , Figure 2 The dashed line in the figure represents the flow direction of the damping oil within the damping regulating valve assembly 3.

[0052] For example, when the piston rod assembly 2 moves upward, the piston rod 21 drives the piston 22 to move upward, which reduces the volume of the upper working chamber 121 and increases the volume of the lower working chamber 122. The damping oil in the upper working chamber 121 enters the intermediate chamber 13 through the working chamber oil outlet 123, and then enters the oil inlet channel 351 through the intermediate chamber oil outlet 131. Subsequently, it enters the throttling channel 341 from the oil inlet channel 351. The valve body assembly 32 adjusts the flow area of ​​the throttling channel 341 to adjust the flow speed of the damping oil, thereby adjusting the magnitude of the damping force on the piston 22 assembly. After the damping oil flows out of the throttling channel 341, it enters the return oil channel 333. Then, the damping oil leaves the return oil channel 333 through the valve outlet hole 332 on the limiting protrusion ring 331, and enters the oil storage chamber 14 through the bottom hole 315 of the valve seat and the side hole 141 of the oil storage chamber in sequence, which increases the oil pressure in the oil storage chamber 14. The damping oil opens the bottom valve and enters the lower working chamber 122 from the oil storage chamber 14 through the bottom channel.

[0053] For example, when the piston rod assembly 2 moves downward, the piston rod 21 drives the piston 22 to move downward, which reduces the volume of the lower working chamber 122 and increases the oil pressure in the lower working chamber 122. The damping oil in the lower working chamber 122 pushes open the piston 22 valve and moves from the lower working chamber 122 to the upper working chamber 121 through the piston 22 channel. As the piston rod assembly 2 moves downward as a whole, the volume occupied by the piston rod assembly 2 in the working chamber 12 increases, which reduces the volume left for the damping oil in the working chamber 12. The damping oil enters the oil inlet channel 351 through the oil outlet 131 of the intermediate cavity, and then enters the throttling channel 341 from the oil inlet channel 351. The valve body assembly 32 adjusts the flow area of ​​the throttling channel 341 to adjust the flow rate of the damping oil, thereby adjusting the magnitude of the damping force on the piston 22 assembly. After the damping oil flows out of the throttling channel 341, it enters the return oil channel 333. Then, the damping oil leaves the return oil channel 333 through the valve outlet hole 332 on the limiting protrusion ring 331, and enters the oil storage chamber 14 through the bottom hole 315 of the valve seat and the side hole 141 of the oil storage chamber in sequence, which increases the oil pressure in the oil storage chamber 14. The damping oil opens the bottom valve and enters the lower working chamber 122 from the oil storage chamber 14 through the bottom channel.

[0054] Reference Figure 1 and Figure 2 According to some embodiments of the present invention, the outer peripheral wall of the intermediate cavity 13 is provided with a connector 132. The connector 132 is located on the outer peripheral side of the oil outlet hole 131 of the intermediate cavity and is arranged around the oil outlet hole 131 of the intermediate cavity. One axial end of the valve body assembly 32 is inserted into the connector 132. The outer peripheral wall of the valve body assembly 32 forms a limiting boss 336. The limiting boss 336 is located on the side of the connector 132 away from the oil outlet hole 131 of the intermediate cavity in the axial direction of the valve body assembly 32. At least a portion of the limiting boss 336 is arranged opposite to the connector 132 in the axial direction of the valve body assembly 32. The limiting boss 336 is located between the connector 132 and the limiting ring 331. In the radial outward direction of the valve body assembly 32, the limiting ring 331 protrudes out of the limiting boss 336.

[0055] For example, when installing the shock absorber 100 as a whole, the side wall of the working chamber 12 is first placed inside the cylinder assembly 1, and the bottom of the working chamber 12 is fixedly connected to the bottom of the side wall of the working chamber 12. Then, the valve body assembly 32 is fixedly connected to the cylinder assembly 1. At this time, since the top of the side wall of the working chamber 12 is not fixedly connected, the side wall of the working chamber 12, together with the side wall of the intermediate chamber 13, may tilt and skew along the axial direction of the valve body assembly 32. This may cause the valve body assembly 32 to be inserted too deeply into the oil outlet hole 131 of the intermediate chamber, making it difficult to pull the valve body assembly 32 out of the oil outlet hole 131 of the intermediate chamber during maintenance or repair.

[0056] By forming a limiting boss 336 on the outer peripheral wall of the valve body assembly 32, and by setting at least a portion of the limiting boss 336 opposite to the connector 132 in the axial direction of the valve body assembly 32, when the side wall of the working chamber 12 and the side wall of the intermediate chamber 13 are inclined toward the valve body assembly 32, the limiting boss 336 abuts against the connector 132 in the axial direction. The limiting boss 336 limits the connector 132 in the axial direction of the valve body assembly 32, which can prevent the side wall of the intermediate chamber 13 from being too tilted, causing the valve body assembly 32 to be inserted too deeply into the oil outlet hole 131 of the intermediate chamber and difficult to pull out.

[0057] Reference Figure 2 According to some embodiments of this utility model, a sealing ring 37 is provided between the inner peripheral wall of the connector 132 and the outer peripheral wall of the valve body assembly 32. By providing a sealing ring 37 between the inner peripheral wall of the connector 132 and the outer peripheral wall of the valve body assembly 32, the sealing effect between the connector 132 and the valve body assembly 32 can be improved, reducing or preventing damping oil from leaking out through the gap between the connector 132 and the valve body assembly 32.

[0058] Furthermore, by providing a sealing ring 37, the sealing ring 37 experiences less pressure in the axial direction. In related technologies, the valve body assembly 32 is integrally vulcanized and coated with a layer of rubber on one side of the connector 132 to form a sealing layer. When the valve body assembly 32 is inserted into the connector 132, the rubber sealing layer experiences significant pressure in the axial direction, making it prone to damage and leading to seal failure. By providing a sealing ring 37 between the inner peripheral wall of the connector 132 and the outer peripheral wall of the valve body assembly 32, the sealing ring 37 experiences less pressure in the axial direction, reducing the risk of seal failure due to damage to the sealing ring 37.

[0059] Reference Figure 2 and Figure 5 According to some embodiments of the present invention, a receiving groove 337 is formed on the outer peripheral wall of the valve body assembly 32. The receiving groove 337 is arranged around the valve body assembly 32, and the sealing ring 37 is accommodated in the receiving groove 337. The width dimension of the receiving groove 337 along the axial direction of the valve body assembly 32 is greater than the width dimension of the sealing ring 37 along the axial direction of the valve body assembly 32 in its natural state.

[0060] For example, the natural state of the sealing ring 37 refers to the state in which the sealing ring 37 is not subjected to external forces such as compression or stretching.

[0061] For example, refer to Figure 2 The width dimension of the receiving groove 337 along the axial direction of the valve body assembly 32 is d3, and the width dimension of the sealing ring 37 along the axial direction of the valve body assembly 32 in its natural state is d4.

[0062] When the valve body assembly 32 is inserted into the connector 132, the sealing ring 37 is compressed in the radial direction of the valve body assembly 32, causing the size of the sealing ring 37 in the radial direction to decrease and the size of the sealing ring 37 in the axial direction to increase. By making the width of the receiving groove 337 in the axial direction of the valve body assembly 32 greater than the width of the sealing ring 37 in the axial direction of the valve body assembly 32 in its natural state, when the sealing ring 37 is compressed, the size of the sealing ring 37 in the axial direction of the valve body assembly 32 increases, and the force exerted by the sidewall of the receiving groove 337 on the sealing ring 37 in the axial direction of the valve body assembly 32 is smaller, or the sidewall of the receiving groove 337 is spaced apart from the sealing ring 37 in the axial direction of the valve body assembly 32, the pressure on the sealing ring 37 in the axial direction can be reduced, thus reducing the risk of sealing failure due to damage to the sealing ring 37.

[0063] Reference Figure 1 and Figure 2 According to some embodiments of the present invention, the valve body assembly 32 includes a valve body 36, a valve core 34, a valve cover 35, and a bridging seat 33. The bridging seat 33 is connected to the oil outlet hole 131 of the intermediate cavity and includes a limiting protrusion 331. The valve cover 35 is located on the side of the bridging seat 33 away from the oil outlet hole 131 of the intermediate cavity in the axial direction, and the valve cover 35 and the bridging seat 33 abut against each other in the axial direction of the valve seat 31. An oil inlet channel 351 is formed on the bridging seat 33 and the valve cover 35. The valve body 36 is located on the side of the bridging seat 33 away from the oil outlet hole 131 of the intermediate cavity in the axial direction. At least the valve cover 35... Part of the valve core 34 is located within the valve body 36. The valve core 34 is movably disposed within the valve body 36 along the axial direction of the valve seat 31 and is located on the side of the valve cover 35 away from the bridge seat 33 in the axial direction. A throttling channel 341 is defined between the valve core 34 and the valve cover 35. The valve body 36 includes a first valve body portion 361 and a second valve body portion 362 arranged along the axial direction of the valve body 36. The first valve body portion 361 is located on the side of the second valve body portion 362 near the bridge seat 33. The first valve body portion 361 is spaced apart from the valve seat peripheral wall 312 to form a return oil channel 333. The second valve body portion 362 is connected and fixed to the valve seat peripheral wall 312.

[0064] By including a bridge seat 33 in the valve body assembly 32, and separating the bridge seat 33 from the valve cover 35, valve core 34, and valve body 36, individual components in the valve body assembly 32 can be more easily manufactured, improving manufacturing efficiency and reducing manufacturing costs.

[0065] When the valve body assembly 32 is in operation, the valve body 36 is connected to the valve seat 31, so that the valve body 36 is fixedly arranged relative to the valve seat 31, the valve cover 35 is fixedly arranged relative to the valve body 36, and the valve spool 34 is movably arranged in the valve body 36 along the axial direction of the valve seat 31. By adjusting the position of the valve spool 34 relative to the valve seat 31, the cross-sectional area of the throttling channel 341 can be adjusted, thereby adjusting the flow rate of damping oil and adjusting the damping capacity of the shock absorber 100.

[0066] For example, the first valve portion and the second valve body portion 362 are integrally formed.

[0067] For example, the second valve body portion 362 is connected to the inner peripheral wall of the valve seat 31 via threads.

[0068] For example, the above-mentioned limit boss 336 is formed on the outer peripheral wall of the bridge seat 33. The limit boss 336 is located on a side of the joint 132 away from the middle chamber oil outlet 131 in the axial direction of the valve body assembly 32, at least part of the limit boss 336 is arranged opposite to the joint 132 in the axial direction of the valve body assembly 32, the limit boss 336 is located between the joint 132 and the limit convex ring 331, and the limit convex ring 331 protrudes from the limit boss 336 in a radially outward direction of the valve body assembly 32.

[0069] For example, the above-mentioned accommodating groove 337 is formed on the bridge seat 33, the accommodating groove 337 is arranged around the bridge seat 33, and the sealing ring 37 is accommodated in the accommodating groove 337.

[0070] For example, the above-mentioned limit boss 336 and the accommodating groove 337 are formed on the bridge seat 33, an end of the bridge seat 33 away from the valve cover 35 in the axial direction of the valve body assembly 32 is a second surface 339, the minimum distance between the side wall of the accommodating groove 337 and the second surface 339 in the axial direction of the valve body assembly 32 is d1, the minimum distance between the limit boss 336 and the joint 132 in the axial direction of the valve body assembly 32 is d2, and d2 < d1. When the side wall of the middle chamber 13 is inclined and the bridge seat 33 is inserted into the oil outlet 131 of the middle chamber, the limit boss 336 abuts against the joint 132 in the axial direction of the valve body assembly 32, and the limit boss 336 exerts a limit effect on the joint 132 in the axial direction of the valve body assembly 32, preventing excessive inclination of the side wall of the middle chamber 13 from causing the side wall of the oil outlet 131 of the middle chamber to scratch the sealing ring 37, which would reduce the sealing effect.

[0071] Refer to Figure 2 and Figure 5According to some embodiments of the present invention, a sealing protrusion 338 is formed on the axial side of the bridging seat 33 facing the valve cover 35. The sealing protrusion 338 is annular and surrounds the oil inlet channel 351. The sealing protrusion 338 abuts against the valve cover 35 in the axial direction of the valve seat 31. By forming a sealing protrusion 338 on the axial side of the bridging seat 33 facing the valve cover 35, and by having the sealing protrusion 338 abut against the valve cover 35 in the axial direction of the valve seat 31, the contact area between the valve cover 35 and the bridging seat 33 can be reduced. This reduces the reduction in sealing effect between the valve cover 35 and the bridging seat 33 caused by unevenness on the surface of the valve cover 35 or the bridging seat 33 due to machining errors, and improves the sealing effect between the valve cover 35 and the bridging seat 33.

[0072] Furthermore, in the direction from the bridging seat 33 to the valve cover 35, the width of the sealing protrusion 338 in the radial direction of the bridging seat 33 gradually decreases. By making the width of the sealing protrusion 338 gradually decrease in the radial direction of the bridging seat 33 in the direction from the bridging seat 33 to the valve cover 35, the structural strength of the sealing protrusion 338 can be improved, preventing the sealing protrusion 338 from being damaged by pressure, and also preventing the sealing protrusion 338 from falling off the bridging seat 33 and causing sealing failure between the bridging seat 33 and the valve cover 35.

[0073] A vehicle according to a second aspect of the present invention includes: an axle, a body, and a shock absorber 100 according to a first aspect of the present invention, wherein one of a cylinder assembly 1 and a piston rod assembly 2 is connected to the axle, and the other of the cylinder assembly 1 and the piston rod assembly 2 is connected to the body.

[0074] Since many other components need to be installed near the axle, by including the shock absorber 100 according to the first aspect of the present invention in the vehicle, the possibility of interference between the damping adjustment valve assembly 3 and other structures on the vehicle can be reduced, thus avoiding vehicle assembly interference and facilitating the layout of other structures near the shock absorber 100.

[0075] For example, when a vehicle is moving, the bumps in the road cause the axle to vibrate up and down. Since one of the cylinder block assembly 1 and the piston rod assembly 2 is connected to the axle, and the other of the cylinder block assembly 1 and the piston rod assembly 2 is connected to the vehicle body, the piston rod assembly 2 vibrates up and down relative to the cylinder block assembly 1. Under the damping effect of the shock absorber 100, the intensity of the vibration transmitted from the axle to the vehicle body can be reduced, the amplitude of the vehicle body vibration can be reduced, and the comfort of passengers inside the vehicle body can be improved.

[0076] The vehicle according to the present invention, by including the shock absorber 100 according to the first aspect of the present invention, reduces the length of the damping adjustment valve assembly 3 in its axial direction, which can reduce the possibility of interference between the damping adjustment valve assembly 3 and other structures on the vehicle, avoid vehicle assembly interference, and facilitate the layout of other structures near the shock absorber 100.

[0077] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0078] In the description of this utility model, "first feature" and "second feature" may include one or more of the features.

[0079] In the description of this utility model, "multiple" means two or more.

[0080] In the description of this utility model, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0081] In the description of this utility model, the terms "above", "over" and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0082] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0083] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A vibration damper, characterized in that, include: A cylinder assembly, wherein a working chamber is defined within the cylinder assembly; A piston rod assembly is movably disposed in the working chamber in a vertical direction. The piston rod assembly includes a piston rod and a piston. The piston is sleeved on the outer periphery of the piston rod and divides the working chamber into an upper working chamber and a lower working chamber disposed in a vertical direction. A damping regulating valve assembly is mounted on the outer peripheral wall of the cylinder assembly and includes a valve seat and a valve body assembly. The valve seat has a mounting cavity, and the valve body assembly is disposed within the mounting cavity. The valve seat includes a valve seat peripheral wall and a first valve seat end wall. The valve seat peripheral wall surrounds the outer peripheral side of the valve body assembly. The first valve seat end wall is connected to the side of the valve seat peripheral wall in the axial direction near the working cavity and is formed as an annulus surrounding the valve body assembly. The valve body assembly includes a limiting protrusion surrounding the valve body assembly. The limiting protrusion and the first valve seat end wall are located within the valve body assembly. The valve body assembly has an oil inlet channel formed within it, which communicates with the upper working chamber. A return oil channel is defined between the outer periphery of the valve body assembly and the peripheral wall of the valve seat. The return oil channel is located on the side of the limiting protrusion ring that is axially away from the end wall of the first valve seat. A valve outlet hole is formed on the limiting protrusion ring. At least a portion of the valve outlet hole is offset from the end wall of the first valve seat and is used to communicate the return oil channel and the lower working chamber. A throttling channel with an adjustable flow area is formed on the peripheral wall of the valve body assembly, which communicates the oil inlet channel and the return oil channel.

2. The vibration damper according to claim 1, characterized in that, The valve oil outlet hole penetrates the outer peripheral surface of the limiting protrusion ring; or, the valve oil outlet hole is spaced apart from the outer peripheral surface of the limiting protrusion ring.

3. The vibration damper according to claim 1, characterized in that, The limiting protrusion ring has multiple valve oil outlet holes, which are arranged at intervals along the circumference of the limiting protrusion ring. And / or, the surface of the first valve seat end wall facing the limiting protrusion is a first surface, and the first surface is an annular shape extending along the circumferential direction of the limiting protrusion.

4. The vibration damper according to claim 1, characterized in that, The portion of the limiting protrusion that contacts the end wall of the first valve seat is an abutment portion. The dimension of the abutment portion in the radial direction of the limiting protrusion is t3. There is a fitting gap between the outer peripheral surface of the limiting protrusion and the inner peripheral surface of the valve seat peripheral wall. The width dimension of the fitting gap in the radial direction of the limiting protrusion is t2. Wherein, t2 ranges from 0.2 to 1.0 mm and / or t2 < t3.

5. The vibration damper according to any one of claims 1-4, characterized in that, The cylinder block assembly defines a working chamber, an intermediate chamber, and an oil reservoir that are spaced apart from each other. The intermediate chamber is located on the outer periphery of the working chamber, and the oil reservoir is located on the outer periphery of the intermediate chamber. The peripheral wall of the upper working chamber has an oil outlet hole that connects the upper working chamber and the intermediate chamber. The peripheral wall of the intermediate chamber has an oil outlet hole, and the peripheral wall of the oil reservoir has a side hole. The side hole and the oil outlet hole of the intermediate chamber are radially opposite to each other in the cylinder block assembly. One axial end of the valve body assembly extends into the oil reservoir through the side hole of the oil reservoir and is connected to the oil outlet of the intermediate cavity. The oil outlet of the intermediate cavity connects the oil inlet channel and the intermediate cavity. The valve seat is located outside the cylinder assembly and the first valve seat end wall is connected to the outer peripheral wall of the oil reservoir. The inner peripheral side of the first valve seat end wall defines a valve seat bottom hole. The valve seat bottom hole communicates with the side hole of the oil reservoir. At least a portion of the valve outlet hole is opposite to and communicates with the valve seat bottom hole in the axial direction of the valve seat.

6. The vibration damper according to claim 5, characterized in that, The outer peripheral wall of the intermediate cavity is provided with a connector, which is located on the outer peripheral side of the oil outlet of the intermediate cavity and surrounds the oil outlet of the intermediate cavity. One axial end of the valve body assembly is inserted into the connector. The outer peripheral wall of the valve body assembly forms a limiting boss. The limiting boss is located on the side of the connector away from the oil outlet of the intermediate cavity in the axial direction of the valve body assembly. At least a portion of the limiting boss is arranged opposite to the connector in the axial direction of the valve body assembly, and the limiting boss is located between the connector and the limiting ring. In the radially outward direction of the valve body assembly, the limiting ring protrudes from the limiting boss.

7. The vibration damper according to claim 6, characterized in that, A sealing ring is provided between the inner peripheral wall of the connector and the outer peripheral wall of the valve body assembly; a receiving groove is formed on the outer peripheral wall of the valve body assembly, the receiving groove is arranged around the valve body assembly, the sealing ring is accommodated in the receiving groove, and the width of the receiving groove along the axial direction of the valve body assembly is greater than the width of the sealing ring along the axial direction of the valve body assembly in its natural state.

8. The vibration damper according to claim 5, characterized in that, The valve body assembly includes a valve body, a valve core, a valve cover, and a bridging seat. The bridging seat is connected to the oil outlet of the intermediate cavity and includes the limiting protrusion ring. The valve cover is located on the side of the bridging seat away from the oil outlet of the intermediate cavity in the axial direction, and the valve cover and the bridging seat abut against each other in the axial direction of the valve seat. The bridging seat and the valve cover form the oil inlet channel. The valve body is located on the side of the bridging seat away from the oil outlet of the intermediate cavity in the axial direction. At least a portion of the valve cover is located within the valve body. The valve core is movably disposed within the valve body along the axial direction of the valve seat and is located on the side of the valve cover away from the bridging seat in the axial direction. The valve core and the valve cover define the throttling channel. The valve body includes a first valve body portion and a second valve body portion arranged along the axial direction of the valve body. The first valve body portion is located on the side of the second valve body portion closer to the bridging seat. The first valve body portion is spaced apart from the peripheral wall of the valve seat to form the oil return channel. The second valve body portion is connected and fixed to the peripheral wall of the valve seat.

9. The vibration damper according to claim 8, characterized in that, A sealing protrusion is formed on the axial side of the bridging seat facing the valve cover. The sealing protrusion is annular and surrounds the oil inlet channel. The sealing protrusion abuts against the valve cover in the axial direction of the valve seat.

10. A vehicle, characterized in that, include: Axle; Body; The shock absorber according to any one of claims 1 to 9, wherein one of the cylinder assembly and the piston rod assembly is connected to the axle, and the other of the cylinder assembly and the piston rod assembly is connected to the vehicle body.

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