Piston structure, shock absorber, and vehicle

Abstract

This invention relates to the field of vehicle technology, specifically to a piston structure, a shock absorber, and a vehicle. The piston structure includes a piston body, a first wall plate, and a flow divider. An annular flow channel is formed between the first wall plate and the piston body. The flow divider is disposed within the annular flow channel and surrounds the piston body. The flow divider includes a first inner circumferential surface, a first outer circumferential surface, and an arc-shaped end face. Along the direction from the first inner circumferential surface to the arc-shaped end face, the first inner circumferential surface and the first outer circumferential surface gradually move away from each other. The arc-shaped end face is a convex arc surface that protrudes away from the first inner circumferential surface. The piston structure proposed in this application can be used to achieve a greater damping effect on the wheel during the shock absorber's extension process than during its compression process, thereby improving the shock absorber's damping effect and resulting in better vehicle ride comfort.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, specifically to piston structures, shock absorbers, and vehicles. Background Technology

[0002] Typically, shock absorbers are used in vehicles to connect the vehicle body and wheels, absorbing and mitigating vibrations transmitted from the wheels to the body when the vehicle is traveling on bumpy roads. A shock absorber typically includes a cylinder and a piston. The piston is located inside the cylinder, which divides the cylinder into two hydraulic chambers filled with hydraulic oil, magnetorheological fluid, or other types of liquid fluid. When the wheel vibrates up and down relative to the vehicle body, it moves the piston relative to the cylinder, compressing the liquid fluid in the two hydraulic chambers to provide damping force against the wheel's vibrations. However, liquid fluid is incompressible, therefore it needs to be able to flow between the two hydraulic chambers.

[0003] In existing technology, a throttle orifice is provided on the piston, connecting two hydraulic chambers. When the piston moves relative to the cylinder, it forces the liquid fluid in the hydraulic chambers into the throttle orifice, thus allowing the liquid fluid to flow between the two chambers. However, when the liquid fluid flows between the two chambers through the throttle orifice, the damping effect provided by the shock absorber on the wheel vibration is the same during both the compression and extension processes. This results in poor vibration damping performance and a less comfortable ride. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this application is to provide a piston structure that aims to solve the problem of how to improve the vibration reduction effect of the shock absorber.

[0005] In a first aspect, this application provides a piston structure, which includes a piston body, a first wall plate, and a flow divider. The first wall plate is disposed around the piston body along the circumference of the piston body, and an annular flow channel is formed between the first wall plate and the piston body. The flow divider is disposed within the annular flow channel and is disposed around the piston body.

[0006] The flow divider includes a first inner circumferential surface, a first outer circumferential surface, and an arc-shaped end face. Along the axial direction of the piston body, one end of the first inner circumferential surface is connected to one end of the first outer circumferential surface, and the arc-shaped end face connects the other end of the first inner circumferential surface and the other end of the first outer circumferential surface. Along the direction from the first inner circumferential surface to the arc-shaped end face, the first inner circumferential surface and the first outer circumferential surface gradually move away from each other, and the arc-shaped end face is a convex arc surface that protrudes away from the first inner circumferential surface.

[0007] Based on the aforementioned technical means, this application provides a piston structure comprising a piston body and a first wall plate. The first wall plate is arranged circumferentially around the piston body, and an annular flow channel is formed between the first wall plate and the piston body. Thus, when the piston structure moves within the shock absorber, the fluid in the shock absorber can flow through the annular flow channel, enabling the shock absorber to achieve compression and tension. During this process, the kinetic energy of the wheel is converted into the thermal energy of the fluid, thereby providing damping force for the vibration of the wheel.

[0008] By incorporating a flow divider within the piston structure, the flow divider is positioned within an annular flow channel and surrounds the piston body. This allows fluid to be diverted along the length of the damper from one end of the annular flow channel to the other. The flow divider comprises a first inner circumferential surface, a first outer circumferential surface, and an arc-shaped end face. Along the axial direction of the piston body, one end of the first inner circumferential surface is connected to one end of the first outer circumferential surface, and the arc-shaped end face connects the other ends of the first inner and outer circumferential surfaces. Thus, the first inner circumferential surface, the first outer circumferential surface, and the arc-shaped end face together constitute the outer surface of the flow divider. The end of the flow divider containing the arc-shaped end face is the first flow divider end, and the end opposite the arc-shaped end face is the second flow divider end; that is, the end where the first and second inner circumferential surfaces connect is the second flow divider end.

[0009] By setting a direction along the first inner circumferential surface pointing towards the arc-shaped end face, the first inner circumferential surface and the first outer circumferential surface gradually move away from each other, and the arc-shaped end face is a convex arc surface that protrudes away from the first inner circumferential surface. Thus, when the fluid flows from the first branching end to the second branching end in the annular flow channel, assuming the fluid flow direction is the first direction, the fluid is split at the arc-shaped end face, forming two branches. These two branches can then flow along the first inner circumferential surface and the first outer circumferential surface respectively, and converge at the second branching end. Because the first inner circumferential surface and the first outer circumferential surface gradually move away from each other, the angle between the flow directions of the two branches when they converge is small. This results in a smaller collision and impact when the two branches converge, thereby generating smaller eddies and reducing the resistance experienced by the fluid during flow.

[0010] When the fluid flows from the second branch end to the first branch end in the annular flow channel, assuming the flow direction of the fluid is the second direction, the fluid is split at the second branch end to form two branches. After that, both branches can flow along the arc-shaped end face and merge together. Since the arc-shaped end face is a convex arc surface that protrudes away from the first inner circumference surface, the angle between the flow directions of the two branches is large when they merge. This makes the collision and impact degree when the two branches merge together greater, thereby generating a larger vortex, so that the fluid experiences relatively greater resistance during the flow process.

[0011] If the fluid flows in the first direction, it corresponds to the compression process of the shock absorber, and the fluid flows in the second direction, it corresponds to the extension process of the shock absorber. This means that the damping experienced by the shock absorber during compression is less than the damping experienced during extension. Therefore, when the vehicle is traveling on a bumpy road, such as when going over a speed bump, the shock absorber can be compressed quickly, thus preventing the vibration of the wheels from being transmitted to the vehicle body. The rebound of the shock absorber, i.e., the extension, is relatively slow. This avoids the occupants from frequently and rapidly swaying up and down with the vehicle body, improving the shock absorption effect and making the vehicle ride more comfortable.

[0012] In some embodiments, the arc-shaped end face is tangent to the first inner peripheral surface and also tangent to the first outer peripheral surface.

[0013] Based on the above technical means, the transition between the arc-shaped end face and the first inner circumferential surface, as well as between the arc-shaped end face and the first outer circumferential surface, can be more natural and smooth. This allows the two branches formed by the diversion component when the fluid flows in the first direction to flow smoothly along the first inner circumferential surface and the first outer circumferential surface, respectively, and to converge together, so as to smoothly form a smaller vortex and generate less resistance to the fluid. It also allows the two branches formed by the diversion component when the fluid flows in the second direction to flow smoothly along the arc-shaped end face, so as to smoothly form a larger vortex and generate greater resistance to the fluid.

[0014] In some embodiments, the intersection of the first outer peripheral surface and the first cross section of the diverter is a straight line or a convex arc surface that protrudes away from the first inner peripheral surface, and the first cross section is coplanar with the axis of the diverter.

[0015] According to the above technical means, when the fluid flows in the first direction or the second direction, the tributary flowing through the first outer peripheral surface can smoothly merge with the tributary flowing through the first inner peripheral surface and form a vortex of corresponding size, which generates resistance to the fluid.

[0016] In some embodiments, the intersection of the first inner peripheral surface and the first cross section of the diverter is a straight line or a convex arc surface protruding away from the first outer peripheral surface, and the first cross section is coplanar with the axis of the diverter.

[0017] According to the above-mentioned technical means, when the fluid flows along the first direction or the second direction, the tributary flowing through the first inner circumferential surface can smoothly merge with the tributary flowing through the first outer circumferential surface and form a vortex of corresponding size, which generates resistance to the fluid.

[0018] In some embodiments, the end of the flow divider where the arcuate end face is located is a first flow divider end, and the end opposite to the arcuate end face is a second flow divider end. Along the axial direction of the piston body, the piston body has a first end and a second end, the second end being used to connect to the piston rod. The flow divider includes a first flow divider and a second flow divider. Along the axial direction of the piston body, the first flow divider and the second flow divider are arranged sequentially, with the first flow divider end of the first flow divider located on the side of the second flow divider facing the first end, and the first flow divider end of the second flow divider located on the side of the second flow divider facing the first end. Along the radial direction of the piston body, the first flow divider is located inside the second flow divider, and the first flow divider end of the first flow divider is located inside the second flow divider end, while the first flow divider end of the second flow divider is located outside the second flow divider end.

[0019] According to the aforementioned technical means, by setting the piston body to include a first end and a second end, with the second end used to connect to the piston rod, the piston body can move under the drive of the piston rod. By setting the flow divider to include a first flow divider and a second flow divider, and arranging the first flow divider and the second flow divider sequentially along the axial direction of the piston body, multiple flow dividers are set in the annular flow channel. As can be seen from the previous analysis, the difference between the compression damping and the tension damping of the vibration damper can increase with the increase of the number of flow dividers. Therefore, arranging the first flow divider and the second flow divider sequentially, while making reasonable use of the space of the annular flow channel, helps to increase the difference between the compression damping and the tension damping of the vibration damper, thereby improving the vibration damping effect of the vibration damper.

[0020] By configuring the first flow divider to be located inside the second flow divider along the radial direction of the piston body, with the first flow divider end of the first flow divider located inside the second flow divider end and the first flow divider end of the second flow divider located outside the second flow divider end, a relatively large amount of fluid in the annular channel will flow along the channel between the outer circumferential surface of the first flow divider and the inner circumferential surface of the second flow divider, while a relatively small amount of fluid will flow along the channel between the inner circumferential surface of the first flow divider and the piston body, and the channel between the outer circumferential surface of the second flow divider and the first wall plate. When the fluid flowing along the channel between the inner circumferential surface of the first distributor and the piston body and the fluid flowing along the channel between the outer circumferential surface of the second distributor and the first wall plate merge with the fluid flowing along the channel between the outer circumferential surface of the first distributor and the inner circumferential surface of the second distributor, the overall tendency of the fluid to flow in the first direction is minimally affected. Furthermore, since the second end of the piston body is used to connect the piston rod, the fluid flowing in the first direction corresponds to the compression process of the damper, thus helping to reduce the compression damping of the damper.

[0021] When the fluid flows in the second direction, a relatively small amount of fluid in the annular channel flows along the channel between the outer circumference of the first distributor and the inner circumference of the second distributor, while a relatively large amount of fluid flows along the channels between the inner circumference of the first distributor and the piston body, and between the outer circumference of the second distributor and the first wall plate. When the fluid flowing along the channel between the inner circumference of the first distributor and the piston body, and the fluid flowing along the channel between the outer circumference of the second distributor and the first wall plate, converge with the fluid flowing along the channel between the outer circumference of the first distributor and the inner circumference of the second distributor, this significantly influences the overall tendency of the fluid to flow in the second direction. Furthermore, since the second end of the piston body is used to connect the piston rod, the fluid flow in the second direction corresponds to the stretching process of the damper, thus contributing to a larger stretching damping of the damper.

[0022] In some embodiments, the annular flow channel includes a flow channel body, a first flow-dividing cavity, and a second flow-dividing cavity. The first flow-dividing cavity is recessed from the inner circumferential surface of the flow channel body away from the outer circumferential surface of the flow channel body, and the second flow-dividing cavity is recessed from the outer circumferential surface of the flow channel body away from the inner circumferential surface of the flow channel body. The first flow-dividing end of the first flow-dividing member is located within the first flow-dividing cavity, and the first flow-dividing end of the second flow-dividing member is located within the second flow-dividing cavity.

[0023] According to the above technical means, by setting an annular flow channel including a main body, a first diversion cavity, and a second diversion cavity, and with the first diversion end of the first diversion component located in the first diversion cavity and the first diversion end of the second diversion component located in the second diversion cavity, when the fluid flows in the first direction, a relatively large amount of fluid in the annular flow channel will flow along the main body, while a relatively small amount of fluid will flow along the first and second diversion cavities. This results in less fluid being diverted by the arc-shaped end faces of the first and second diversion components. When the fluid flowing along the main body merges with the fluid flowing along the first and second diversion cavities, the overall tendency of the fluid to flow in the first direction is minimized. The vortex formed after the fluid merges at the second diversion end of the diversion component is smaller, thus contributing to a smaller compressive damping of the shock absorber.

[0024] When the fluid flows in the second direction, because the first branching end of the first branching member is inclined inward relative to the second branching end, and the first branching end of the second branching member is inclined outward relative to the second branching end, the fluid in the annular flow channel will come into contact with the second branching ends of the first and second branching members and be branched. This results in a relatively large amount of fluid entering the first and second branching chambers, reducing the amount of fluid flowing along the main body of the flow channel. At this time, the angle between the flow direction of the fluid flowing along the main body of the flow channel and the flow direction of the fluid flowing along the first branching chamber or the flow direction of the fluid flowing along the second branching chamber is larger. As a result, the impact between the fluid flowing along the main body of the flow channel and the fluid flowing along the first and second branching chambers is larger, generating a larger vortex. This has a significant impact on the overall tendency of the fluid to flow in the second direction, thus helping to make the tensile damping of the shock absorber larger.

[0025] In some embodiments, the first diversion cavity is inclined in a direction that gradually moves away from the outer peripheral surface of the flow channel body along the direction from the second end to the first end.

[0026] According to the above-mentioned technical means, the first diversion cavity is set at an angle so that when the fluid flows in the second direction, after the diversion component diverts the fluid, the inner wall surface of the first diversion cavity can also guide the fluid, making it easier and smoother for the fluid to enter the first diversion cavity. Furthermore, when the fluid entering the first diversion cavity flows to the arc-shaped end face of the diversion component, under the combined guiding effect of the arc-shaped end face and the inner wall surface of the first diversion cavity, it will enter the main body of the flow channel along the radial direction of the piston body and merge with the fluid in the main body of the flow channel. This can generate a greater impact force on the fluid in the main body of the flow channel, thereby generating a larger vortex and better increasing damping.

[0027] In some embodiments, the second diversion cavity is inclined in a direction that gradually moves away from the inner circumferential surface of the flow channel body along the direction from the second end to the first end.

[0028] According to the aforementioned technical means, the second diversion chamber is inclined in this way. When the fluid flows in the second direction, after the diversion component diverts the fluid, the inner wall surface of the second diversion chamber can also guide the fluid, making it easier and smoother for the fluid to enter the second diversion chamber. Furthermore, when the fluid entering the second diversion chamber flows to the arc-shaped end face of the diversion component, under the combined guiding effect of the arc-shaped end face and the inner wall surface of the second diversion chamber, it will enter the main flow channel along the radial direction of the piston body and merge with the fluid in the main flow channel. This generates a greater impact force on the fluid in the main flow channel, thereby producing a larger vortex and better increasing damping.

[0029] In some embodiments, the diverter further includes a plurality of connecting portions, which are spaced apart circumferentially along the diverter and are all connected to the arcuate end face. The connecting portion of the first diverter is connected to the inner circumferential surface of the annular flow channel, such that the arcuate end face of the first diverter has a gap with the inner circumferential surface of the annular flow channel, and the second diverting end of the first diverter has a gap with the outer circumferential surface of the annular flow channel. The connecting portion of the second diverter is connected to the outer circumferential surface of the annular flow channel, such that the arcuate end face of the second diverter has a gap with the outer circumferential surface of the annular flow channel, and the second diverting end of the second diverter has a gap with the inner circumferential surface of the annular flow channel.

[0030] According to the above technical means, by setting the flow divider to include multiple connecting parts, the flow divider can be connected to the piston body or the first wall plate through the connecting parts, so that the flow divider is firmly fixed in the annular flow channel. By setting the connecting part of the first flow divider to connect with the inner circumferential surface of the annular flow channel, so that the arc-shaped end face of the first flow divider and the inner circumferential surface of the annular flow channel have a gap, a branch flowing through this gap can be divided in the fluid, so that when the fluid flows in the first direction or the second direction, different branches collide and generate resistance, which helps to achieve that the compressive damping of the shock absorber is less than the tensile damping. By setting the connecting part of the second flow divider to connect with the outer circumferential surface of the annular flow channel, so that the arc-shaped end face of the second flow divider and the outer circumferential surface of the annular flow channel have a gap, a branch flowing through this gap can be divided in the fluid, so that when the fluid flows in the first direction or the second direction, different branches collide and generate resistance, which also helps to achieve that the compressive damping of the shock absorber is less than the tensile damping.

[0031] In some embodiments, there are multiple first diverter components and multiple second diverter components, and the multiple first diverter components and multiple second diverter components are arranged alternately along the axial direction of the piston body.

[0032] Based on the aforementioned technical means, and as can be seen from the foregoing analysis, the difference between the compression damping and the tension damping of the shock absorber can increase with the increase of the number of diverter components. Therefore, multiple first diverter components and multiple second diverter components are set, and these components are arranged alternately along the axial direction of the piston body. This helps to increase the difference between the compression damping and the tension damping of the shock absorber and improve the damping effect of the shock absorber by making reasonable use of the space of the annular flow channel.

[0033] In some embodiments, the piston body includes a body and a second wall plate, with the annular flow channel formed between the second wall plate and the first wall plate. The second wall plate is disposed around and connected to the body, and the second wall plate and the body form a receiving cavity. The piston structure further includes a magnetic element housed within the receiving cavity.

[0034] According to the above technical means, by setting the piston body to include a body and a second wall plate, and the second wall plate and the body to form a receiving cavity, and the magnetic component is set in the receiving cavity, when the fluid is a magnetorheological fluid, the viscosity of the magnetorheological fluid can be changed by applying magnetic forces of different magnitudes to the magnetorheological fluid through the magnetic component, thereby changing the compression damping and tensile damping of the vibration damper. This allows the vibration damper to be applicable to working scenarios with different damping requirements, thus improving the vibration damping effect of the vibration damper in the corresponding working scenarios.

[0035] In some embodiments, the first wall panel is provided with a first slot, the piston body includes a body and a snap-fit ​​protrusion connected to the body, the snap-fit ​​protrusion snaps into the first slot, and the snap-fit ​​protrusion is provided with a first flow channel communicating with the annular flow channel.

[0036] According to the above-mentioned technical means, the first wall plate is provided with a first slot, and the piston body includes a snap-fit ​​protrusion connected to the body. The snap-fit ​​protrusion snaps into the first slot, thus realizing the connection between the first wall plate and the piston body. By providing a first flow channel communicating with the annular flow channel on the snap-fit ​​protrusion, the fluid can flow smoothly through the piston structure through the annular flow channel and the first flow channel, so that the vibration damper can achieve compression and tension.

[0037] Secondly, embodiments of this application provide a vibration damper, including any of the piston structures described above.

[0038] Thirdly, this application provides a vehicle including any of the above-described shock absorbers. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of this application or the background art, the accompanying drawings used in the embodiments of this application will be described below.

[0040] Figure 1 A schematic diagram of a vehicle provided for some embodiments of this application; Figure 2 for Figure 1 A schematic diagram of the shock absorbers in the vehicle shown. Figure 3 for Figure 2 A schematic diagram of the piston structure in the shock absorber shown. Figure 4 for Figure 3The diagram shows the piston structure when fluid flows from the first branch end to the second branch end. Figure 5 for Figure 3 The diagram shows the piston structure when fluid flows from the second branch end to the first branch end. Figure 6 for Figure 3 A schematic diagram of the first flow divider in the piston structure shown; Figure 7 for Figure 6 The front view of the first diversion component shown; Figure 8 for Figure 6 A cross-sectional view of the first diversion component shown; Figure 9 for Figure 3 A schematic diagram of the second flow divider in the piston structure shown; Figure 10 for Figure 9 The front view of the second diverter shown; Figure 11 for Figure 9 A cross-sectional view of the second diverter shown; Figure 12 for Figure 3 A magnified view of a portion of the piston structure shown near its first end; Figure 13 for Figure 3 The image shows a magnified view of the piston structure near its second end.

[0041] Explanation of reference numerals in the attached figures: 100 - Vehicle; 20 - Wheel; 30 - Body; 10-Shock absorber; 1-Piston structure; 11-Piston body; 111-First end; 112-Second end; 113-Body body; 114-Second wall plate; 115-Snap-fit ​​protrusion; 1151-First flow channel; 12-First wall plate; 121-First slot; 13-Flow divider; 131-First inner circumferential surface; 132-First outer circumferential surface; 133-Arc-shaped end face; 134-First flow divider end; 135-Second flow divider end; 136-First flow divider; 137-Second flow divider; 138-Connecting part; 139-Notch; 14-Annular flow channel; 141-Flow channel body part; 142-First flow divider cavity; 143-Second flow divider cavity; 15-Magnetic component; 2-Cylinder; 3-Piston rod; V1-Receiving cavity. Detailed Implementation

[0042] The terms “first,” “second,” etc., are used for descriptive purposes only and have no sequential or technical meaning, nor should they be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0043] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. "Fixed connection" refers to a connection where the relative positional relationship remains unchanged after connection. "Rotary connection" refers to a connection where the two parts can rotate relative to each other after connection. "Sliding connection" refers to a connection where the two parts can slide relative to each other after connection.

[0044] The terms "parallel" and "perpendicular" are relative to the current technological level, not absolute mathematical definitions. Slight deviations are permissible; approximations of parallelism or perpendicularity are acceptable. For example, "A and B are parallel" means that A and B are parallel or approximately parallel, with the angle between them ranging from 0 to 5 degrees. Similarly, "A and B are perpendicular" means that A and B are perpendicular or approximately perpendicular, with the angle between them ranging from 85 to 95 degrees.

[0045] The embodiments of this application will now be described with reference to the accompanying drawings.

[0046] See Figure 1 Some embodiments of this application provide a vehicle 100. The vehicle 100 can be a fuel-powered vehicle, a pure electric vehicle, a hybrid vehicle, etc., and this application does not specifically limit it.

[0047] In some embodiments, the vehicle 100 includes a body 30, wheels 20, and a shock absorber 10. The body 30 provides a passenger space for occupants to drive the vehicle 100; the wheels 20 are connected to the body 30 so that the vehicle 100 can be driven by the rotation of the wheels 20; the shock absorber 10 is disposed between the body 30 and the wheels 20, with one end of the shock absorber 10 connected to the body 30 and the other end connected to the wheels 20. The shock absorber 10 can be compressed and stretched when the wheels 20 move up and down relative to the body 30, while providing damping force to absorb and reduce the vibration transmitted from the wheels 20 to the body 30.

[0048] In some embodiments, see Figure 2 The shock absorber 10 includes a cylinder 2, a piston structure 1, and a piston rod 3. The piston structure 1 is located inside the cylinder 2 and is sealed to the inner circumferential surface of the cylinder 2, dividing the cylinder 2 into a rod chamber and a rodless chamber. The piston structure 1 is capable of moving axially within the cylinder 2. One end of the piston rod 3 is located in the rod chamber and connected to the piston structure 1, while the other end of the piston rod 3 is connected to the vehicle body 30. The cylinder 2 is connected to the wheel 20. Hydraulic oil, magnetorheological fluid, or other types of liquid fluid are contained in the rod chamber and the rodless chamber.

[0049] The piston structure 1 has a flow channel connecting the rod chamber and the rodless chamber. When the wheel 20 vibrates up and down relative to the vehicle body 30, the wheel 20 drives the cylinder 2 to move up and down, causing the piston structure 1 to move up and down relative to the cylinder 2, thus stretching and compressing the shock absorber 10. During the stretching and compression process, the piston squeezes the liquid fluid to flow between the rod chamber and the rodless chamber, thereby providing damping force to the vibration of the wheel 20, so as to absorb and reduce the vibration of the wheel 20, thus providing a good driving experience for the occupants.

[0050] However, if the shock absorber provides the same amount of damping to the wheel during both extension and compression, it will cause a problem when the vehicle is traveling on bumpy roads, such as when going over speed bumps. First, the shock absorber is rapidly compressed to prevent wheel vibrations from being transmitted to the vehicle body. Then, because the shock absorber provides the same amount of damping to the wheel during both extension and compression, it will rapidly extend. Since the extension and compression of the shock absorber corresponds to the up-and-down movement of the vehicle body, this will cause the occupants to be frequently and rapidly jolted up and down with the vehicle, resulting in a poor driving experience.

[0051] Therefore, in order to further improve the vibration reduction effect of the shock absorber, please refer to... Figure 3 and Figure 4 Some embodiments of this application provide a piston structure 1. The piston structure 1 includes a piston body 11, a first wall plate 12, and a flow divider 13. The first wall plate 12 is disposed circumferentially around the piston body 11, and an annular flow channel 14 is formed between the first wall plate 12 and the piston body 11. The flow divider 13 is disposed within the annular flow channel 14 and surrounds the piston body 11. The annular flow channel 14 connects the rod-side chamber and the rodless chamber of the vibration damper 10.

[0052] The flow divider 13 includes a first inner circumferential surface 131, a first outer circumferential surface 132, and an arc-shaped end face 133. Along the axial direction of the piston body 11, one end of the first inner circumferential surface 131 is connected to one end of the first outer circumferential surface 132, and the arc-shaped end face 133 is connected between the other end of the first inner circumferential surface 131 and the other end of the first outer circumferential surface 132. Along the direction from the first inner circumferential surface 131 to the arc-shaped end face 133, the first inner circumferential surface 131 and the first outer circumferential surface 132 gradually move away from each other, and the arc-shaped end face 133 is a convex arc surface that protrudes away from the first inner circumferential surface 131.

[0053] This application provides a piston structure 1 comprising a piston body 11 and a first wall plate 12. The first wall plate 12 is arranged circumferentially around the piston body 11, and an annular flow channel 14 is formed between the first wall plate 12 and the piston body 11. Thus, when the piston structure 1 moves within the shock absorber 10, the fluid in the shock absorber 10 can flow through the annular flow channel 14, allowing the shock absorber 10 to achieve compression and tension, converting the kinetic energy of the wheel 20 into the thermal energy of the fluid during this process. Therefore, the shock absorber 10 can provide damping force for the vibration of the wheel 20.

[0054] By including a flow divider 13 within the annular flow channel 14 and surrounding the piston body 11, the piston structure 1 allows fluid to flow from one end of the annular flow channel 14 to the other along the length of the damper 10, thus being diverted by the flow divider 13. The flow divider 13 includes a first inner circumferential surface 131, a first outer circumferential surface 132, and an arc-shaped end face 133. Along the axial direction of the piston body 11, one end of the first inner circumferential surface 131 is connected to one end of the first outer circumferential surface 132, and the arc-shaped end face 133 connects the other ends of the first inner circumferential surface 131 and the first outer circumferential surface 132. Thus, the first inner circumferential surface 131, the first outer circumferential surface 132, and the arc-shaped end face 133 together constitute the outer surface of the flow divider 13. Among them, the end of the diverter 13 with the arc-shaped end face 133 is the first diverter end 134, and the end opposite to the arc-shaped end face 133 is the second diverter end 135. That is, the end where the first inner circumferential surface 131 and the first outer circumferential surface 132 of the diverter 13 are connected is the second diverter end 135.

[0055] By setting a direction along the first inner circumferential surface 131 pointing towards the arc-shaped end face 133, the first inner circumferential surface 131 and the first outer circumferential surface 132 gradually move away from each other, and the arc-shaped end face 133 is a convex arc surface that protrudes away from the first inner circumferential surface 131. Thus, when the fluid flows from the first branch end 134 to the second branch end 135 in the annular flow channel 14, let's assume that the flow direction of the fluid at this time is the first direction (e.g., Figure 12 (See direction X shown in the image) Figure 4 After being split at the arc-shaped end face 133, the fluid forms two branches. These two branches can then flow along the first inner circumferential surface 131 and the first outer circumferential surface 132 respectively, and converge at the second split end 135. Since the first inner circumferential surface 131 and the first outer circumferential surface 132 gradually move away from each other, the angle between the flow directions of the two branches when they converge is small. This results in a smaller collision and impact when the two branches converge, thereby generating a smaller vortex and reducing the resistance experienced by the fluid during flow.

[0056] When the fluid flows from the second branch end 135 to the first branch end 134 in the annular flow channel 14, let's assume that the flow direction of the fluid at this time is the second direction (e.g., Figure 13 (The direction Y shown in the text) See Figure 5 After the fluid is split at the second branch end 135, it forms two branches. Both branches can then flow along the arc-shaped end face 133 and merge together. Since the arc-shaped end face 133 is a convex arc surface that protrudes away from the first inner circumferential surface 131, the angle between the flow directions of the two branches is large when they merge. This results in a greater degree of collision and impact when the two branches merge, which can generate a larger vortex, so that the fluid experiences relatively greater resistance during the flow process.

[0057] When the fluid flows in the first direction, it corresponds to the compression process of the shock absorber 10; when the fluid flows in the second direction, it corresponds to the extension process of the shock absorber 10. This means that the damping experienced by the shock absorber 10 during compression is less than the damping experienced during extension. Therefore, when the vehicle 100 is traveling on a bumpy road, such as when passing over a speed bump, the shock absorber 10 can be compressed quickly, thereby preventing the vibration of the wheel 20 from being transmitted to the vehicle body 30. The rebound of the shock absorber 10, i.e., the extension, is relatively slow. This can prevent the occupants from frequently and rapidly swaying up and down with the vehicle body 30, improve the damping effect of the shock absorber 10, and make the ride comfort of the vehicle 100 better.

[0058] It should be noted that the terms "smaller eddies and smaller drag" and "larger eddies and larger drag" mentioned above are all relative. That is, the eddies and drag generated by the fluid flowing in the first direction are smaller than those generated by the fluid flowing in the second direction, and the eddies and drag generated by the fluid flowing in the second direction are larger than those generated by the fluid flowing in the first direction.

[0059] In some embodiments, the arc-shaped end face 133 is tangent to the first inner circumferential surface 131 and the first outer circumferential surface 132. This makes the transition between the arc-shaped end face 133 and the first inner circumferential surface 131, and between the arc-shaped end face 133 and the first outer circumferential surface 132, more natural and smooth. This allows the two branches formed by the diversion member 13 when the fluid flows in the first direction to flow smoothly along the first inner circumferential surface 131 and the first outer circumferential surface 132 respectively, and to converge together, so as to smoothly form a smaller vortex and generate less resistance to the fluid. It also allows the two branches formed by the diversion member 13 when the fluid flows in the second direction to flow smoothly along the arc-shaped end face 133, so as to smoothly form a larger vortex and generate greater resistance to the fluid.

[0060] In some other embodiments, the arc-shaped end face may not be tangent to either the first inner circumferential surface or the first outer circumferential surface. This also allows for the confluence of the two branches.

[0061] In some embodiments, the intersection of the first outer peripheral surface and the first cross-section of the diverter is a straight line or a convex arc surface protruding away from the first inner peripheral surface, and the first cross-section is coplanar with the axis of the diverter. Thus, when the fluid flows in the first direction or the second direction, the tributary flowing through the first outer peripheral surface can smoothly merge with the tributary flowing through the first inner peripheral surface, forming a vortex of a corresponding size, which generates resistance to the fluid.

[0062] In some embodiments, the intersection of the first inner circumferential surface and the first cross-section of the diverter is a straight line or a convex arc surface protruding away from the first outer circumferential surface, and the first cross-section is coplanar with the axis of the diverter. Thus, when the fluid flows along the first direction or the second direction, the tributary flowing through the first inner circumferential surface can smoothly merge with the tributary flowing through the first outer circumferential surface, forming a vortex of a corresponding size, which generates resistance to the fluid.

[0063] In this application, the intersection line of the first outer peripheral surface and the first cross section of the diverter is used as a straight line, and the intersection line of the first inner peripheral surface and the first cross section of the diverter is used as a straight line for illustrative purposes.

[0064] In some embodiments, see Figure 3 as well as Figures 6 to 11 The piston body 11 has a first end 111 and a second end 112, the second end 112 being used to connect the piston rod 3. The flow divider 13 includes a first flow divider 136 and a second flow divider 137, that is, there can be two flow dividers 13, namely the first flow divider 136 and the second flow divider 137.

[0065] Along the axial direction of the piston body 11, the first diverter 136 and the second diverter 137 are arranged in sequence, and the first diverter end 134 of the first diverter 136 is located on the side of the second diverter end 135 facing the first end 111, and the first diverter end 134 of the second diverter 137 is located on the side of the second diverter end 135 facing the first end 111.

[0066] Along the radial direction of the piston body 11, the first diverter 136 is located inside the second diverter 137, and the first diverter end 134 of the first diverter 136 is located inside the second diverter end 135, while the first diverter end 134 of the second diverter 137 is located outside the second diverter end 135.

[0067] That is, the maximum radial dimension of the first diverter 136 is smaller than the minimum radial dimension of the second diverter 137. Furthermore, the first diverting end 134 of the first diverter 136 is inclined inward relative to the second diverting end 135, and the first diverting end 134 of the second diverter 137 is inclined outward relative to the second diverting end 135.

[0068] By configuring the piston body 11 to include a first end 111 and a second end 112, with the second end 112 used to connect to the piston rod 3, the piston body 11 can move under the drive of the piston rod 3. By configuring the flow divider 13 to include a first flow divider 136 and a second flow divider 137, and arranging the first flow divider 136 and the second flow divider 137 sequentially along the axial direction of the piston body 11, multiple flow dividers 13 are configured in the annular flow channel 14. As can be seen from the previous analysis, the difference between the compressive damping and tensile damping of the damper 10 can increase with the increase of the number of flow dividers 13. Therefore, arranging the first flow divider 136 and the second flow divider 137 sequentially, while making reasonable use of the space of the annular flow channel 14, helps to increase the difference between the compressive damping and tensile damping of the damper 10, thereby improving the damping effect of the damper 10.

[0069] By configuring the first diverter 136 to be located inside the second diverter 137 along the radial direction of the piston body 11, and the first diverting end 134 of the first diverter 136 to be located inside the second diverting end 135, and the first diverting end 134 of the second diverter 137 to be located outside the second diverting end 135, when the fluid flows in the first direction, a relatively large amount of fluid in the annular channel 14 will flow along the channel between the outer peripheral surface of the first diverter 136 and the inner peripheral surface of the second diverter 137, while a relatively small amount of fluid will flow along the channel between the inner peripheral surface of the first diverter 136 and the piston body 11, and the channel between the outer peripheral surface of the second diverter 137 and the first wall plate 12. When the fluid flowing along the channel between the inner circumferential surface of the first diverter 136 and the piston body 11 and the fluid flowing along the channel between the outer circumferential surface of the second diverter 137 and the first wall plate 12 merge with the fluid flowing along the channel between the outer circumferential surface of the first diverter 136 and the inner circumferential surface of the second diverter 137, the overall tendency of the fluid to flow in the first direction is less affected. Since the second end 112 of the piston body 11 is used to connect the piston rod 3, the fluid flowing in the first direction corresponds to the compression process of the damper 10, so this helps to make the compression damping of the damper 10 smaller.

[0070] When the fluid flows in the second direction, a relatively small amount of fluid in the annular channel 14 flows along the channel between the outer peripheral surface of the first diverter 136 and the inner peripheral surface of the second diverter 137, while a relatively large amount of fluid flows along the channel between the inner peripheral surface of the first diverter 136 and the piston body 11, and the channel between the outer peripheral surface of the second diverter 137 and the first wall plate 12. When the fluid flowing along the channel between the inner peripheral surface of the first diverter 136 and the piston body 11, and the fluid flowing along the channel between the outer peripheral surface of the second diverter 137 and the first wall plate 12, merge with the fluid flowing along the channel between the outer peripheral surface of the first diverter 136 and the inner peripheral surface of the second diverter 137, this significantly affects the overall tendency of the fluid to flow in the second direction. Furthermore, since the second end 112 of the piston body 11 is used to connect the piston rod 3, the fluid flow in the second direction corresponds to the stretching process of the damper 10, thus contributing to a larger stretching damping of the damper 10.

[0071] In some other embodiments, the flow divider may consist only of a first flow divider, which is positioned closer to the inner circumferential surface of the annular flow channel than its outer circumferential surface. Alternatively, the flow divider may consist only of a second flow divider, which is positioned closer to the outer circumferential surface of the annular flow channel than its inner circumferential surface.

[0072] In some other embodiments, the first diversion end of the first diversion member is not tilted relative to the second diversion end, and the first diversion end of the second diversion member is not tilted relative to the second diversion end.

[0073] In some embodiments, see Figure 12 and Figure 13 The annular flow channel 14 includes a main flow channel portion 141, a first flow-dividing cavity 142, and a second flow-dividing cavity 143. The first flow-dividing cavity 142 is recessed from the inner circumferential surface of the main flow channel portion 141 away from the outer circumferential surface of the main flow channel portion 141, and the second flow-dividing cavity 143 is recessed from the outer circumferential surface of the main flow channel portion 141 away from the inner circumferential surface of the main flow channel portion 141. The first flow-dividing end 134 of the first flow-dividing member 136 is located in the first flow-dividing cavity 142, and the first flow-dividing end 134 of the second flow-dividing member 137 is located in the second flow-dividing cavity 143.

[0074] The annular flow channel 14 includes a main body 141, a first flow divider 142, and a second flow divider 143, with the first flow divider end 134 of the first flow divider 136 located in the first flow divider 142 and the first flow divider end 134 of the second flow divider 137 located in the second flow divider 143. In this way, when the fluid flows in the first direction, a relatively large amount of fluid in the annular flow channel 14 will flow along the main body of the flow channel 141, and a relatively small amount of fluid will flow along the first diversion cavity 142 and the second diversion cavity 143. Thus, less fluid is diverted by the arc-shaped end faces 133 of the first diversion member 136 and the second diversion member 137. When the fluid flowing along the main body of the flow channel 141 merges with the fluid flowing along the first diversion cavity 142 and the second diversion cavity 143, the influence on the overall trend of the fluid flowing in the first direction is small. The vortex formed after the fluid merges at the second diversion end 135 of the diversion member 13 is small, which helps to reduce the compression damping of the shock absorber 10.

[0075] When the fluid flows in the second direction, because the first diversion end 134 of the first diversion member 136 is inclined inward relative to the second diversion end 135, and the first diversion end 134 of the second diversion member 137 is inclined outward relative to the second diversion end 135, the fluid in the annular flow channel 14 will come into contact with the second diversion ends 135 of the first diversion member 136 and the second diversion member 137 and be diverted, resulting in a relatively large amount of fluid entering the first diversion cavity 142 and the second diversion cavity 143, reducing the fluid flowing along the main body of the flow channel 141, and at this time along The angle between the flow direction of the fluid flowing along the main body 141 and the flow direction of the fluid flowing along the first branch cavity 142 or the flow direction of the fluid flowing along the second branch cavity 143 is larger. This results in a greater impact between the fluid flowing along the main body 141 and the fluid flowing along the first branch cavity 142 and the second branch cavity 143 when they converge, generating a larger vortex. This has a greater impact on the overall flow tendency of the fluid along the second direction, thus helping to make the tensile damping of the shock absorber 10 greater.

[0076] In some examples, the second diversion end 135 of the first diversion member 136 and the second diversion end 135 of the second diversion member 137 are located within the main body of the flow channel 141. This makes it easier for the fluid to be diverted when flowing in the second direction, thereby making it easier for more fluid to enter the first diversion chamber 142 and the second diversion chamber 143.

[0077] In some other embodiments, the annular flow channel may include only the main body of the flow channel, or only the main body of the flow channel and the first branch cavity, or only the main body of the flow channel and the second branch cavity.

[0078] In some embodiments, see Figure 12 and Figure 13The first diversion cavity 142 is inclined in a direction gradually moving away from the outer peripheral surface of the main flow channel 141, pointing from the second end 112 to the first end 111. This inclined arrangement of the first diversion cavity 142 allows the fluid to flow more easily and smoothly into the first diversion cavity 142 after the diversion member 13 has diverted the fluid along the second direction. Consequently, when the fluid flowing into the first diversion cavity 142 reaches the arc-shaped end face 133 of the diversion member 13, under the combined guiding effect of the arc-shaped end face 133 and the inner wall surface of the first diversion cavity 142, it will enter the main flow channel 141 radially and merge with the fluid in the main flow channel 141. This generates a greater impact force on the fluid in the main flow channel 141, resulting in a larger vortex and increased damping.

[0079] In some other embodiments, the first diversion cavity may not be tilted; for example, the first diversion cavity may be a spherical groove structure.

[0080] In some embodiments, see Figure 12 and Figure 13 Along the direction from the second end 112 to the first end 111, the second diversion cavity 143 is inclined in a direction that gradually moves away from the inner circumferential surface of the main flow channel 141. This inclined arrangement of the second diversion cavity 143 allows the fluid to flow more easily and smoothly into the second diversion cavity 143 after being diverted by the diverting member 13 when the fluid flows in the second direction. Consequently, when the fluid entering the second diversion cavity 143 reaches the arc-shaped end face 133 of the diverting member 13, under the combined guiding effect of the arc-shaped end face 133 and the inner wall surface of the second diversion cavity 143, it will enter the main flow channel 141 radially inclined along the piston body 11 and merge with the fluid in the main flow channel 141. This generates a greater impact force on the fluid in the main flow channel 141, resulting in a larger vortex and thus better increasing damping.

[0081] In some other embodiments, the second diversion cavity may not be tilted; for example, the second diversion cavity may be a spherical groove structure.

[0082] In some embodiments, see Figure 6 and Figure 9The diverter 13 also includes a plurality of connecting portions 138, which are spaced apart circumferentially along the diverter 13 and are all connected to the arc-shaped end face 133. The connecting portion 138 of the first diverter 136 is connected to the inner circumferential surface of the annular channel 14, so that the arc-shaped end face 133 of the first diverter 136 and the inner circumferential surface of the annular channel 14 have a gap. For example, the connecting portion 138 of the first diverter 136 and the inner circumferential surface of the annular channel 14 can be connected by welding, snap-fitting, screwing, or other methods. The second diverting end 135 of the first diverter 136 has a gap with the outer circumferential surface of the annular channel 14. The connecting portion 138 of the second diverter 137 is connected to the outer circumferential surface of the annular channel 14, so that the arc-shaped end face 133 of the second diverter 137 and the outer circumferential surface of the annular channel 14 have a gap. For example, the connecting portion 138 of the second diverter 137 can be connected to the inner circumferential surface of the annular flow channel 14 by means of welding, snap-fitting, screwing, etc. The second diverting end 135 of the second diverter 137 has a gap with the inner circumferential surface of the annular flow channel 14.

[0083] The flow divider 13 also includes multiple connecting portions 138, allowing it to be connected to the piston body 11 or the first wall plate 12 via these portions, thus securing it firmly within the annular flow channel 14. The connecting portion 138 of the first flow divider 136 is connected to the inner circumferential surface of the annular flow channel 14, creating a gap between the arc-shaped end face 133 of the first flow divider 136 and the inner circumferential surface of the annular flow channel 14. This allows for the division of the fluid into branches flowing through this gap, enabling collisions and resistance between different branches as the fluid flows in the first or second direction. This helps to achieve a compressive damping of the damper 10 that is less than its tensile damping. By connecting the connecting portion 138 of the second diverter 137 to the outer peripheral surface of the annular flow channel 14, a gap is formed between the arc-shaped end face 133 of the second diverter 137 and the outer peripheral surface of the annular flow channel 14. This allows the flow of a branch through this gap to be divided in the fluid, so that when the fluid flows in the first or second direction, different branches collide and generate resistance. This also helps to achieve a compressive damping of the damper 10 that is less than its tensile damping.

[0084] In some examples, the shunt component can be integrally manufactured by casting, forging, or machining to achieve the connection between the connector and the curved end face. In other examples, the connector and the curved end face can also be connected by welding, snap-fitting, screwing, or other methods.

[0085] In some examples, see Figure 6 and Figure 9The flow divider 13 has a notch 139 to facilitate its placement on the piston body 11 or the first wall plate 12. In other examples, the flow divider includes multiple dispersed sub-components along its circumference, which also facilitates its placement on the piston body or the first wall plate. In this case, the sub-components can be connected to the piston body or the first wall plate by welding or snap-fitting.

[0086] In some examples, the connecting part can be a block structure, a plate structure, or other irregular structure, etc.

[0087] In some embodiments, see Figure 3 The number of first diverter 136 and second diverter 137 are both multiple, and the multiple first diverter 136 and multiple second diverter 137 are arranged alternately along the axial direction of the piston body 11. As can be seen from the above analysis, the difference between the compression damping and the tension damping of the damper 10 can increase with the increase of the number of diverter 13. Therefore, the number of first diverter 136 and second diverter 137 are both multiple, and the multiple first diverter 136 and multiple second diverter 137 are arranged alternately along the axial direction of the piston body 11. In this way, based on the reasonable use of the space of the annular flow channel 14, it helps to increase the difference between the compression damping and the tension damping of the damper 10, and improve the damping effect of the damper 10.

[0088] In some examples, the number of the first diverter and the second diverter can both be 2, 3 or 5, etc. In this application, the example is illustrated by having 3 of each of the first diverter 136 and the second diverter 137.

[0089] In some embodiments, see Figure 3 The piston body 11 includes a body 113 and a second wall plate 114, with an annular flow channel 14 formed between the second wall plate 114 and the first wall plate 12. The second wall plate 114 is disposed around the body 113 and connected to the body 113, forming a receiving cavity V1 with the body 113. The piston structure 1 also includes a magnetic element 15, which is housed within the receiving cavity V1.

[0090] By setting the piston body 11 to include a body 113 and a second wall plate 114, and the second wall plate 114 and the body 113 to form a receiving cavity V1, and the magnetic element 15 is disposed in the receiving cavity V1, when the fluid is a magnetorheological fluid, the viscosity of the magnetorheological fluid can be changed by applying magnetic forces of different magnitudes to the magnetorheological fluid through the magnetic element 15, thereby changing the compression damping and tensile damping of the vibration damper 10, so that the vibration damper 10 can be applied to working scenarios with different damping requirements, and the vibration damping effect of the vibration damper 10 in the corresponding working scenarios is improved.

[0091] In some examples, the body can be a cylindrical structure or a polygonal column structure, etc.

[0092] In some examples, the second wall plate 114 is connected to the body 113 by an interference fit between the hole and the shaft. In other examples, the inner circumferential surface of the second wall plate is provided with internal threads, and the outer circumferential surface of the body is provided with external threads, and the two are connected by threads.

[0093] In some embodiments, see Figure 3 The first wall plate 12 is provided with a first slot 121. The piston body 11 includes a body 113 and a snap-fit ​​protrusion 115 connected to the body 113. The snap-fit ​​protrusion 115 snaps into the first slot 121, and the snap-fit ​​protrusion 115 is provided with a first flow channel 1151 communicating with the annular flow channel 14. By providing the first slot 121 on the first wall plate 12 and the snap-fit ​​protrusion 115 connected to the body 113 on the piston body 11, the connection between the first wall plate 12 and the piston body 11 can be achieved. By providing the first flow channel 1151 communicating with the annular flow channel 14 on the snap-fit ​​protrusion 115, fluid can flow smoothly through the annular flow channel 14 and the first flow channel 1151 through the piston structure 1, so that the vibration damper 10 can achieve compression and tension.

[0094] In some examples, the snap-fit ​​protrusion can be a ring-shaped structure or a block-shaped structure, etc.

[0095] In some examples, the first panel 12 includes a first sub-part and a second sub-part, with the second sub-part connected to the side of the first sub-part near the second end 112 along the axial direction of the piston body 11. Exemplarily, the second sub-part may be an annular thin plate, and the end of the second sub-part away from the first sub-part may be bent toward the side near the piston body 11 to form a first groove 121.

[0096] In some examples, the piston body 11 also includes a pressure plate located at the first end 111 of the piston body 11. The first wall plate 12 is also provided with a second slot, in which the pressure plate is engaged and pressed against the first end 111 of the piston body 11 to further connect the piston body 11 and the first wall plate 12. The pressure plate is provided with a second flow channel communicating with the annular flow channel 14 to facilitate fluid flow within the cylinder 2.

[0097] In some examples, the first wall plate 12 further includes a third sub-section, which is connected to the side of the first sub-section near the first end 111 along the axial direction of the piston body 11. Exemplarily, the third sub-section can be an annular thin plate, and the end of the third sub-section away from the first sub-section can be bent towards the side near the piston body 11 to form a second groove. A portion of the pressure plate is engaged in the second groove to fix the pressure plate on the piston structure 1. The pressure plate is provided with a second flow channel communicating with the annular flow channel 14, so that fluid can flow smoothly through the second flow channel, the annular flow channel 14, and the first flow channel 1151 through the piston structure 1, so that the damper 10 can achieve compression and tension.

[0098] In some embodiments, the outer peripheral surface of the first wall plate 12 is used to seal against the inner peripheral surface of the cylinder 2. From one end of the first wall plate 12 along the axial direction of the piston body 11 to the other end, the outer diameter of the first wall plate 12 gradually increases and then gradually decreases. Thus, when the piston structure 1 is placed inside the cylinder 2, only the portion of the first wall plate 12 near the middle is in close contact with the inner wall of the cylinder 2, while the portion from the middle to both ends of the first wall plate 12 has a certain gap with the inner wall of the cylinder 2. This prevents the piston structure 1 from jamming relative to the cylinder 2 when it moves with the piston rod 3, thereby improving the overall reliability of the vibration damper 10, and thus improving its vibration damping effect.

[0099] It should be understood that the application of this application is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims. Those skilled in the art can understand that implementing all or part of the processes of the above embodiments and making equivalent changes according to the claims of this application still fall within the scope of this application.

Claims

1. A piston structure (1), characterized in that, For a shock absorber (10), the piston structure (1) includes a piston body (11), a first wall plate (12) and a flow divider (13). The first wall plate (12) is arranged around the piston body (11) in the circumferential direction, and an annular flow channel (14) is formed between the first wall plate (12) and the piston body (11). The flow divider (13) is disposed in the annular flow channel (14) and is arranged around the piston body (11). The flow divider (13) includes a first inner circumferential surface (131), a first outer circumferential surface (132), and an arc-shaped end face (133). Along the axial direction of the piston body (11), one end of the first inner circumferential surface (131) is connected to one end of the first outer circumferential surface (132), and the arc-shaped end face (133) is connected between the other end of the first inner circumferential surface (131) and the other end of the first outer circumferential surface (132). Along the direction from the first inner circumferential surface (131) to the arc-shaped end face (133), the first inner circumferential surface (131) and the first outer circumferential surface (132) gradually move away from each other, and the arc-shaped end face (133) is a convex arc surface that protrudes away from the first inner circumferential surface (131).

2. The piston structure (1) according to claim 1, characterized in that, The arc-shaped end face (133) is tangent to the first inner peripheral face (131) and tangent to the first outer peripheral face (132).

3. The piston structure (1) according to claim 1, characterized in that, The intersection of the first outer peripheral surface (132) and the first cross section of the diverter (13) is a straight line or a convex arc surface that protrudes away from the first inner peripheral surface (131), and the first cross section is coplanar with the axis of the diverter (13); And / or, the intersection of the first inner peripheral surface (131) and the first cross section of the diverter (13) is a straight line or a convex arc surface protruding away from the first outer peripheral surface (132), and the first cross section is coplanar with the axis of the diverter (13).

4. The piston structure (1) according to any one of claims 1-3, characterized in that, The end of the flow divider (13) with the arc-shaped end face (133) is the first flow divider end (134), and the end opposite to the arc-shaped end face (133) is the second flow divider end (135); along the axial direction of the piston body (11), the piston body (11) has a first end (111) and a second end (112), and the second end (112) is used to connect the piston rod (3); The flow divider (13) includes a first flow divider (136) and a second flow divider (137). Along the axial direction of the piston body (11), the first flow divider (136) and the second flow divider (137) are arranged in sequence, and the first flow divider end (134) of the first flow divider (136) is located on the side of the second flow divider end (135) facing the first end (111), and the first flow divider end (134) of the second flow divider (137) is located on the side of the second flow divider end (135) facing the first end (111). Along the radial direction of the piston body (11), the first diverter (136) is located inside the second diverter (137), and the first diverting end (134) of the first diverter (136) is located inside the second diverting end (135), while the first diverting end (134) of the second diverter (137) is located outside the second diverting end (135).

5. The piston structure (1) according to claim 4, characterized in that, The annular flow channel (14) includes a flow channel main body (141), a first flow branch cavity (142), and a second flow branch cavity (143). The first flow branch cavity (142) is recessed from the inner peripheral surface of the flow channel main body (141) away from the outer peripheral surface of the flow channel main body (141), and the second flow branch cavity (143) is recessed from the outer peripheral surface of the flow channel main body (141) away from the inner peripheral surface of the flow channel main body (141). The first diversion end (134) of the first diversion component (136) is located in the first diversion cavity (142), and the first diversion end (134) of the second diversion component (137) is located in the second diversion cavity (143).

6. The piston structure (1) according to claim 5, characterized in that, Along the direction from the second end (112) to the first end (111), the first diversion cavity (142) is inclined in a direction that gradually moves away from the outer peripheral surface of the main body of the flow channel (141); And / or, along the direction from the second end (112) to the first end (111), the second diversion cavity (143) is inclined in a direction gradually away from the inner circumferential surface of the main body of the flow channel (141).

7. The piston structure (1) according to claim 4, characterized in that, The diverter (13) also includes a plurality of connecting parts (138), which are spaced apart along the circumference of the diverter (13), and all of the connecting parts (138) are connected to the arc-shaped end face (133). The connecting portion (138) of the first diverter (136) is connected to the inner circumferential surface of the annular flow channel (14) so ​​that the arc-shaped end face (133) of the first diverter (136) has a gap with the inner circumferential surface of the annular flow channel (14), and the second diverting end (135) of the first diverter (136) has a gap with the outer circumferential surface of the annular flow channel (14); The connecting portion (138) of the second diverter (137) is connected to the outer peripheral surface of the annular flow channel (14) so ​​that the arc-shaped end face (133) of the second diverter (137) has a gap with the outer peripheral surface of the annular flow channel (14), and the second diverting end (135) of the second diverter (137) has a gap with the inner peripheral surface of the annular flow channel (14).

8. The piston structure (1) according to claim 4, characterized in that, The number of the first diverter (136) and the second diverter (137) are both multiple, and the multiple first diverters (136) and the multiple second diverters (137) are arranged alternately along the axial direction of the piston body (11).

9. The piston structure (1) according to any one of claims 1-3, characterized in that, The piston body (11) includes a body (113) and a second wall plate (114), and the second wall plate (114) forms the annular flow channel (14) between the first wall plate (12); the second wall plate (114) is arranged around the body (113) and connected to the body (113), and the second wall plate (114) and the body (113) form a receiving cavity (V1). The piston structure (1) further includes a magnetic element (15), which is housed within the receiving cavity (V1).

10. The piston structure (1) according to any one of claims 1-3, characterized in that, The first wall panel (12) is provided with a first slot (121). The piston body (11) includes a body (113) and a snap-fit ​​protrusion (115) connected to the body (113). The snap-fit ​​protrusion (115) snaps into the first slot (121), and the snap-fit ​​protrusion (115) is provided with a first flow channel (1151) communicating with the annular flow channel (14).

11. A vibration damper (10), characterized in that, Includes the piston structure (1) as described in any one of claims 1-10.

12. A vehicle (100), characterized in that, Includes the damper (10) as described in claim 11.

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