Piston assembly and shock absorber

Abstract

The utility model relates to the technical field of shock absorbers, and particularly provides a piston assembly and a shock absorber. The piston assembly comprises a cylinder barrel, a piston arranged in an inner cavity of the cylinder barrel in a sliding mode, a control valve and a filtering device, wherein the control valve and the filtering device are arranged on a piston body of the piston. Wherein the plug body divides the inner cavity into a first working cavity and a second working cavity, the plug body is provided with a first channel for oil liquid in the inner cavity to flow between the first working cavity and the second working cavity, and the control valve is used for regulating and controlling the flow speed of the oil liquid passing through the first channel; the filtering device is arranged adjacent to the control valve and filters oil entering the control valve. According to the piston assembly, on the basis that oil liquid needs to pass through the second channel in the control valve, the filtering device is arranged outside the control valve, impurities in the oil liquid are prevented from entering the control valve, the possibility that the second channel in the control valve is blocked can be effectively reduced, and therefore the operation stability of the piston assembly is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of vibration damper technology, and in particular to a piston assembly. Additionally, this utility model also relates to a vibration damper. Background Technology

[0002] As people's demands for vehicle ride comfort continue to increase, shock absorbers, as key components affecting vehicle damping effect and comfort, are of paramount importance; especially in motorcycles, the role of shock absorbers in their ride comfort is particularly crucial.

[0003] In existing technologies, shock absorbers can adjust their damping force in real time and precisely according to different road conditions and driving conditions, effectively reducing vehicle vibration. For example, electronically controlled shock absorbers contain solenoid valves, whose opening and closing are typically controlled by the vehicle's ECU (Electronic Control Unit). By changing the opening degree of the solenoid valve, the rate at which oil flows through the valve can be adjusted, thereby changing the damping force of the shock absorber. This process is almost real-time, with the solenoid valve adjusting at a frequency of hundreds of times per second, ensuring that the shock absorber can quickly adjust its damping force according to road conditions and driving conditions to provide the most suitable damping force.

[0004] However, cleanliness is a crucial indicator in the first hydraulic channel controlled by the solenoid valve. Excessive impurities can cause solenoid valve malfunction, affecting the normal operation of the entire damping system. During the operation of the shock absorber, impurities may enter the solenoid valve, jamming the valve core and preventing it from functioning properly. This results in the shock absorber failing to adjust its damping force as expected, affecting vehicle comfort and handling. In severe cases, it may even cause other vehicle malfunctions and threaten the safety of riders. Therefore, a feasible solution is urgently needed to address the issue of impurities entering the first hydraulic channel of the solenoid valve. Utility Model Content

[0005] In view of this, the present invention aims to provide a piston assembly to reduce the possibility of blockage in the second channel inside the control valve of the piston assembly.

[0006] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0007] A piston assembly includes a cylinder, a piston slidably disposed in the inner cavity of the cylinder, and a control valve and a filter device disposed at the piston body; the piston body divides the inner cavity into a first working chamber and a second working chamber, and the piston body is provided with a first channel for oil in the inner cavity to flow between the first working chamber and the second working chamber; the control valve is used to regulate the flow rate of the oil through the first channel; the filter device is arranged adjacent to the control valve and filters the oil entering the control valve.

[0008] Furthermore, the plug body has a first assembly groove on the side facing the second working chamber, the first channel is located at the bottom of the first assembly groove, and the control valve is located at the opening of the first assembly groove; the control valve has a second channel with controllable flow rate inside, and the first inlet and the second inlet at both ends of the second channel are respectively connected to the first assembly groove and the second working chamber.

[0009] Furthermore, the filtering device includes a first filter element disposed in the first assembly groove, the first filter element being positioned between the first channel and the first inlet / outlet.

[0010] Furthermore, the first filter element includes an annular frame and a first filter screen disposed on the annular frame; a boss is provided on the side wall of the first assembly groove, and the annular frame is pressed against the boss by the control valve.

[0011] Furthermore, the piston rod includes a rod body located in the second working chamber and a connecting portion located at one end of the rod body near the piston body; the connecting portion is provided with a second mounting groove on the side facing the piston body, and the end of the control valve away from the piston body is inserted into the second mounting groove; the second inlet / outlet is opened on the side wall of the control valve and is located between the connecting portion and the piston body.

[0012] Furthermore, the filtration device includes a cylindrical second filter element, which is fitted onto the control valve, with both ends of the second filter element abutting against the plug and the connecting portion, respectively.

[0013] Furthermore, the second filter element includes a cylindrical frame and a second filter screen disposed on the cylindrical frame.

[0014] Furthermore, along the circumference of the cylindrical frame, a plurality of windows are spaced apart on the cylindrical frame, and each of the windows is provided with the second filter screen.

[0015] Furthermore, the two ends of the control valve are respectively screwed to the openings of the first assembly groove and the second assembly groove.

[0016] Compared with the prior art, this utility model has the following advantages:

[0017] (1) The piston assembly of this utility model has a control valve installed at the piston body to regulate the flow rate of the oil flowing through the first channel on the piston body, or to directly close the control valve to cut off the first channel, thereby changing the flow velocity of the oil flowing between the first working chamber and the second working chamber, which can effectively control the up-and-down movement speed of the piston in the cylinder. When the piston assembly is used as a shock absorber, the regulation of the flow velocity of the oil at the first channel can change the damping performance of the shock absorber. Since the oil flowing through the first channel needs to pass through the second channel inside the control valve, by installing a filter device outside the control valve to prevent impurities in the oil from entering the control valve, the possibility of blockage in the second channel inside the control valve can be effectively reduced, thereby ensuring the operational stability of the piston assembly.

[0018] (2) A first assembly groove is provided on the plug body, which can enclose the end of the control valve near the plug body into the first assembly groove and realize a reliable connection between the control valve and the plug body; then a first channel is provided at the bottom of the first assembly groove, and the first inlet and the second inlet on the control valve are connected to the first assembly groove and the second working chamber respectively, so that the oil flow between the first working chamber and the second working chamber must pass through the second channel in the control valve before it can flow through the first channel, thereby effectively playing the role of the control valve in regulating the flow rate.

[0019] (3) A first filter element is installed in the first assembly groove to form a barrier filter between the first channel and the first inlet / outlet, which can prevent impurities in the oil on the first working chamber side from entering the second channel of the control valve through the first inlet / outlet; and the first assembly groove provides good installation conditions for the first filter element.

[0020] (4) The first filter element adopts a disc-shaped structure and supports the first filter screen through an annular frame. This not only ensures the blocking and filtering effect of the first filter element, but also facilitates the fixed installation of the annular frame through the boss on the side plate of the first assembly slot and the abutment action of the control valve.

[0021] (5) A connecting part is provided at the end of the piston rod. By providing a second assembly groove on the connecting part, the control valve can be partially inserted into the second assembly groove, thus accommodating most of the volume of the control valve. This allows the control valve to be well assembled between the piston rod and the piston body, and the connection between the piston rod and the piston body is achieved through the control valve. Based on the above assembly structure, the second inlet and outlet are set on the side wall of the control valve. The second inlet and outlet can communicate with the second working chamber through the gap between the connecting part and the inner wall of the inner cavity, thereby forming a flow path with controllable flow between the first working chamber and the second working chamber.

[0022] (6) The second filter element is designed as a cylinder. By fitting the second filter element onto the outside of the control valve, the second inlet and outlet can be blocked and filtered. In terms of assembly and fixing, while completing the connection assembly of the connecting part and the control valve, the connecting part and the plug body clamp and fix the second filter element from the top and bottom ends, thereby ensuring the assembly stability and convenience of the second filter element. Moreover, since the top and bottom ends of the second filter element are respectively sealed to the plug body and the connecting part, the oil entering and exiting the second inlet and outlet must pass through the second filter element, thereby effectively preventing impurities in the oil on the second working chamber side from entering the control valve through the second inlet and outlet.

[0023] (7) A cylindrical frame is designed for the second filter element, which provides a good support foundation for the arrangement of the second filter screen. The cylindrical frame can realize the assembly and fixation of the second filter element and support the second filter screen, while the second filter screen can play a reliable filtering role.

[0024] (8) Multiple windows are opened at intervals on the cylindrical frame, and a second filter screen is laid on each window to form a stable frame structure; the windows are opened at intervals on the cylindrical frame, the structure is simple, and it is easy to process and form the cylindrical frame.

[0025] (9) Both ends of the control valve are connected to the plug body and the plug rod by screw connection. This connection method is not only stable and reliable, making the control valve form a stable connection between the plug body and the plug rod, but also provides a good arrangement for the assembly of the control valve between the plug body and the connection part, which is convenient for the assembly operation of the plug rod, control valve, plug body and filter device.

[0026] Another objective of this invention is to provide a vibration damper that employs the piston assembly described herein. The vibration damper of this invention possesses the technical advantages of the aforementioned piston assembly. Attached Figure Description

[0027] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of this utility model. The illustrative embodiments and descriptions of this utility model are used to explain this utility model. The directional terms such as front / back, up / down, etc., used therein are only used to indicate relative positional relationships and do not constitute an improper limitation of this utility model. In the drawings:

[0028] Figure 1 This is a cross-sectional structural diagram of the piston assembly described in an embodiment of the present utility model;

[0029] Figure 2 for Figure 1 A magnified view of the area shown in section A;

[0030] Figure 3 This is a three-dimensional structural diagram of the first filter element described in an embodiment of the present utility model;

[0031] Figure 4 This is a three-dimensional structural diagram of the second filter element described in an embodiment of the present utility model;

[0032] Figure 5 This is a schematic diagram of the overall structure of the vibration damper described in this embodiment of the utility model;

[0033] Figure 6 for Figure 5 A schematic diagram of the oil flow direction at part B during the piston's downward movement;

[0034] Figure 7 for Figure 5 The diagram shows the direction of oil flow at part B during the piston's upward movement.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1. Cylinder barrel; 11. First working chamber; 12. Second working chamber;

[0037] 2. Plug rod; 20. Connecting part; 200. Second assembly slot; 21. Rod body;

[0038] 3. Control valve; 30. Valve seat; 31. Second channel; 311. First inlet / outlet; 312. Second inlet / outlet; 32. Valve core;

[0039] 4. Plug body; 40. First assembly groove; 400. Boss; 41. First channel; 42. Sealing ring;

[0040] 5. Filtering device; 51. First filter element; 511. Annular frame; 512. First filter screen; 52. Second filter element; 521. Cylindrical frame; 522. Second filter screen;

[0041] 6. Controller; 7. Sensor. Detailed Implementation

[0042] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0043] In the description of this utility model, it should be stated that if terms such as "upper," "lower," "left," "right," "front," "back," "inner," and "outer" appear, they 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 do not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0044] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model in light of the specific circumstances. The limiting terms such as "first," "second," "A," "B," "C," and "D" appearing in the description of this utility model are merely for distinguishing similar features in different locations, attributions, or uses, in order to avoid ambiguity and confusion, and should not be construed as indicating or implying relative importance.

[0045] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0046] Example 1

[0047] This embodiment relates to a piston assembly that can reduce the possibility of blockage in the second passage 31 inside the control valve 3 in the piston assembly; an exemplary structure is as follows: Figure 1 and Figure 2 As shown.

[0048] Overall, the piston assembly includes a cylinder 1, a piston slidably disposed within the inner cavity of the cylinder 1, and a control valve 3 and a filter device 5 disposed at the piston body 4. The piston body 4 divides the inner cavity into a first working chamber 11 and a second working chamber 12, and has a first channel 41 for oil in the inner cavity to flow between the first working chamber 11 and the second working chamber 12. The control valve 3 regulates the flow rate of the oil through the first channel 41; simultaneously, the filter device 5 is arranged adjacent to the control valve 3 and filters the oil entering the control valve 3.

[0049] It should be noted that, based on the above-mentioned overall design concept, the technical solution of this utility model can adopt a variety of different specific implementation structures, forms, or configuration sequences. For example, the above-mentioned filtration device 5 can adopt various filter media such as filter element, filter screen, and filter cloth; the specific arrangement sequence and assembly method of control valve 3, plug body 4, and plug rod 2 can also be flexibly adjusted. For parts required for the implementation of the overall solution but not covered in the above-mentioned overall setup, reasonable and flexible design can be carried out by referring to mature setup methods in the field and the actual situation during implementation. The specific implementation schemes described below in this embodiment are only one of the many solutions that can be formed by the above-mentioned combinations and variations. In actual implementation, those skilled in the art can make flexible adjustments and improvements based on the actual situation. Obviously, the many solutions that can be formed by the above-mentioned combinations and variations, as well as the specific implementation schemes of this embodiment, are all within the protection scope of this utility model.

[0050] Specifically, such as Figure 2 and combined Figure 1 As shown, the plug body 4 in this embodiment is provided with a plurality of sealing rings 42 on its circumferential surface, so that the plug body 4 can slide up and down in the inner cavity while ensuring the sealing between the plug body 4 and the inner wall of the inner cavity, preventing oil from flowing through the gap between the plug body 4 and the inner wall of the inner cavity.

[0051] The plug body 4 has a first assembly groove 40 on the side facing the second working chamber 12. The aforementioned first channel 41 is located at the bottom of the first assembly groove 40, and the control valve 3 is located at the opening of the first assembly groove 40. Based on the above configuration, the control valve 3 in this embodiment has a second channel 31 with controllable flow rate inside. The first inlet / outlet 311 and the second inlet / outlet 312 at both ends of the second channel 31 are respectively connected to the first assembly groove 40 and the second working chamber 12.

[0052] By providing a first assembly groove 40 on the plug body 4, the end of the control valve 3 near the plug body 4 can be contained within the first assembly groove 40, thus achieving a reliable connection between the control valve 3 and the plug body 4. Furthermore, a first channel 41 is provided at the bottom of the first assembly groove 40, and the first inlet / outlet 311 and the second inlet / outlet 312 on the control valve 3 are respectively connected to the first assembly groove 40 and the second working chamber 12. This ensures that the oil flow between the first working chamber 11 and the second working chamber 12 must pass through the second channel 31 in the control valve 3 before it can flow through the first channel 41, thereby effectively utilizing the flow rate regulation function of the control valve 3.

[0053] Of course, the control valve 3 mentioned above can be an existing mature solenoid valve product; in this embodiment, the control valve 3 includes a valve seat 30 with a second channel 31 and a valve core 32 controlled by a circuit. The valve core 32 moves axially in the control valve 3 to adjust the size of the valve port, thereby changing the flow rate of the oil through the second channel 31.

[0054] Regarding the specific configuration of the filtration device 5, in addition to using various filter media such as filter cartridges, filter cloths, and filter screens, its specific structural form can also have many different solutions. In this embodiment, as shown... Figure 2 and Figure 3As shown, the filtering device 5 in this embodiment includes a first filter element 51 disposed in the first assembly groove 40. The first filter element 51 blocks the flow between the first channel 41 and the first inlet / outlet 311, thereby filtering the oil entering the control valve 3 through the first inlet / outlet 311. The placement of the first filter element 51 within the first assembly groove 40 creates a barrier filtration between the first channel 41 and the first inlet / outlet 311, preventing impurities in the oil on the first working chamber 11 side from entering the second channel 31 of the control valve 3 through the first inlet / outlet 311. Furthermore, the first assembly groove 40 provides favorable installation conditions for the first filter element 51.

[0055] Specifically, such as Figure 3 As shown, the first filter element 51 in this embodiment includes an annular frame 511 and a first filter screen 512 mounted on the annular frame 511. Meanwhile, a boss 400 is provided on the side wall of the first assembly groove 40. When the first filter element 51 is assembled in place, the annular frame 511 is pressed against the boss 400 by the control valve 3. The first filter element 51 adopts a disc-shaped structure, and the annular frame 511 supports the first filter screen 512, which not only ensures the blocking and filtering effect of the first filter element 51, but also facilitates the fixed installation of the annular frame 511 through the abutment action of the boss 400 on the side plate of the first assembly groove 40 and the control valve 3.

[0056] For the configuration of the piston rod 2, there are, of course, several different structural options available; for example, the piston rod 2 can be a conventional rod-shaped structure, directly fixed to the piston body 4, or fixed to the piston body 4 via a control valve 3; naturally, the end of the piston rod 2 furthest from the piston body 4 will protrude from the end of the cylinder 1 for connecting to components requiring vibration damping, such as the subframe. In this embodiment, as... Figure 2 and Figure 1 As shown, the plug rod 2 includes a rod body 21 located in the second working chamber 12, and a connecting part 20 located at one end of the rod body 21 near the plug body 4; at the same time, a second assembly groove 200 is provided on the side of the connecting part 20 facing the plug body 4, and the end of the control valve 3 away from the plug body 4 is inserted into the second assembly groove 200.

[0057] Based on the above configuration, the second inlet / outlet 312 is located on the side wall of the control valve 3, and the second inlet / outlet 312 is located between the connecting part 20 and the plug body 4; in this way, the oil in the second working chamber 12 can reach the second inlet / outlet 312 through the gap between the connecting part 20 and the inner wall of the inner cavity, and then enter the control valve 3.

[0058] A connecting portion 20 is provided at the end of the piston rod 2. By providing a second mounting groove 200 on the connecting portion 20, the control valve 3 can be partially inserted into the second mounting groove 200, thus accommodating most of the volume of the control valve 3. This allows the control valve 3 to be well assembled between the piston rod 2 and the piston body 4, and the connection between the piston rod 2 and the piston body 4 is achieved through the control valve 3. Based on the above assembly structure, a second inlet / outlet 312 is provided on the side wall of the control valve 3. The second inlet / outlet 312 can communicate with the second working chamber 12 through the gap between the connecting portion 20 and the inner wall of the cavity, thereby forming a flow path with controllable flow between the first working chamber 11 and the second working chamber 12.

[0059] Based on the assembly arrangement of the control valve 3, the connecting part 20, and the plug 4, the filter device 5 in this embodiment further includes a cylindrical second filter element 52. For example... Figure 2 and combined Figure 4 As shown, in this embodiment, the second filter element 52 is fitted onto the control valve 3, with both ends of the second filter element 52 abutting against the plug body 4 and the connecting part 20, respectively. The second filter element 52 is designed as a cylinder, and by fitting it onto the outside of the control valve 3, it can effectively block and filter the second inlet / outlet 312. In terms of assembly and fixing, while completing the connection assembly of the connecting part 20 and the control valve 3, the connecting part 20 and the plug body 4 clamp and fix the second filter element 52 from both the top and bottom ends, thus ensuring the assembly stability and convenience of the second filter element 52. Furthermore, since the top and bottom ends of the second filter element 52 abut and seal against the plug body 4 and the connecting part 20, the oil entering and exiting the second inlet / outlet 312 must pass through the second filter element 52, effectively preventing impurities in the oil on the second working chamber 12 side from entering the control valve 3 through the second inlet / outlet 312.

[0060] There are, of course, many different structural options for the second filter element 52; for example, a wire mesh can be used, which can be directly bent into a cylindrical shape, or thicker wires can be laid on the edge of the cylindrical wire mesh to form a cage-like skeleton structure.

[0061] In this embodiment, as Figure 4 As shown, the second filter element 52 includes a cylindrical frame 521 and a second filter screen 522 mounted on the cylindrical frame 521. The cylindrical frame 521 designed for the second filter element 52 provides a good supporting foundation for the arrangement of the second filter screen 522. The cylindrical frame 521 can realize the assembly and fixation of the second filter element 52 and support the second filter screen 522, while the second filter screen 522 can play a reliable filtering role.

[0062] Specifically, still as Figure 4As shown, the cylindrical frame 521 of this embodiment is formed by bending a plate. Multiple windows are spaced apart along the circumference of the cylindrical frame 521, and a second filter screen 522 is provided in each window. The spaced openings of multiple windows on the cylindrical frame 521 and the placement of the second filter screen 522 in each window form a stable frame structure. Furthermore, the spaced openings of the windows on the cylindrical frame 521 result in a simple structure and facilitate the processing and forming of the cylindrical frame 521. Because the cylindrical frame 521 provides structural support, it prevents deformation of the second filter element 52 due to compression from the connecting part 20 after assembly. This prevents oil leakage at the second filter element 52, thus preventing the filtration function of the second filter element 52 from failing.

[0063] The annular frame 511 or cylindrical frame 521 mentioned above can be integrally injection molded from plastic material. The first filter screen 512 and the second filter screen 522 can be made of metal material to achieve an effective filtration effect.

[0064] Given the connection arrangement of the control valve 3 between the plug body 4 and the connecting part 20, the control valve 3 should naturally be designed as a cylindrical shape. The connection between the control valve 3 and the plug body 4, and the connection between the control valve 3 and the connecting part 20, can be achieved using different methods such as snap-fit ​​or screw connection. In this embodiment, the two ends of the control valve 3 are directly screwed into the openings of the first assembly groove 40 and the second assembly groove 200, respectively. Both ends of the control valve 3 are connected to the plug body 4 and the plug rod 2 by screw connection, which not only ensures a stable and reliable connection, allowing the control valve 3 to form a stable connection between the plug body 4 and the plug rod 2, but also provides a good arrangement for the assembly of the control valve 3 between the plug body 4 and the connecting part 20, facilitating the assembly operation of the plug rod 2, the control valve 3, the plug body 4, and the filter device 5.

[0065] In the actual assembly process, the first filter element 51 is first placed on the boss 400 in the first assembly groove 40, and then the control valve 3 is screwed to the groove opening of the first assembly groove 40, thereby pressing and fixing the first filter element 51; then the second filter element 52 is fitted onto the middle of the control valve 3, and the connecting part 20 is screwed onto the control valve 3. When the connecting part 20 is tightened in place, the second filter element 52 will be clamped by the connecting part 20 and the plug 4, thereby completing the installation and fixing of the second filter element 52 on the side of the control valve 3.

[0066] In summary, the piston assembly of this embodiment features a control valve 3 at the piston body 4 to regulate the flow rate of oil through the first channel 41 on the piston body 4, or to directly close the control valve 3 to cut off the first channel 41, thereby changing the flow velocity of the oil between the first working chamber 11 and the second working chamber 12. This effectively controls the vertical movement speed of the piston in the cylinder 1. When the piston assembly is used as a shock absorber, regulating the flow velocity of the oil at the first channel 41 can alter the damping performance of the shock absorber. Since the oil flowing through the first channel 41 must pass through the second channel 31 inside the control valve 3, a filter device 5 is installed outside the control valve 3 to prevent impurities in the oil from entering the control valve 3. This effectively reduces the possibility of blockage in the second channel 31 inside the control valve 3, thus ensuring the operational stability of the piston assembly.

[0067] Example 2

[0068] This embodiment relates to a vibration damper, and the vibration damper adopts the piston assembly provided in Embodiment 1; an exemplary structural configuration of the vibration damper is as follows: Figure 5 As shown.

[0069] Of course, the above-mentioned piston assembly filter structure can be applied to conventional shock absorbers or to electronically controlled shock absorbers. When applied to electronically controlled shock absorbers, the control valve 3 installed in the piston assembly can be controlled by the signal sent by the control unit to regulate the flow of oil in the control valve 3.

[0070] Taking an electronically controlled shock absorber as an example, the entire electronically controlled shock absorber also requires a sensor 7 and a controller 6. The sensor 7 receives road surface information during vehicle movement and transmits this information signal to the controller 6. The controller 6 determines the damping force signal of the shock absorber based on preset parameters and quickly adjusts the opening of the control valve 3 to adjust the damping force of the shock absorber. The specific damping process of the shock absorber can be combined with... Figure 6 , Figure 7 As shown.

[0071] Based on the overall setup described above, the working principle and process of the vibration damper in this embodiment are as follows:

[0072] The recovery motion of the shock absorber is as follows Figure 6 As shown, during this movement, the piston 4 moves downwards relative to the cylinder 1, as indicated by the large arrow in the figure. That is, when the piston rod 2 extends outwards (to the bottom) of the cylinder 1, the oil in the second working chamber 12 is pressurized and enters the first working chamber 11 through the second channel 31 of the control valve 3 and the first channel 41 on the piston 4. The control valve 3 can adjust the magnitude of the restoring damping force by adjusting the flow rate of the oil in the second channel 31. The flow direction and path of the oil throughout the process are as follows: Figure 6 The curve with the small arrow is shown in the image.

[0073] The compression motion of the shock absorber, such as Figure 7 As shown, during this movement, the piston 4 moves upward relative to the cylinder 1, as indicated by the large arrow in the figure. That is, when the piston rod 2 retracts into the cylinder 1, the oil in the first working chamber 11 is pressurized and enters the second working chamber 12 through the first channel 41 on the piston 4 and the second channel 31 in the control valve 3. The control valve 3 can adjust the magnitude of the compression damping force by adjusting the flow rate of the oil in the second channel 31. The flow direction and path of the oil throughout the process are as follows: Figure 7 The curve with the small arrow is shown in the image.

[0074] Regarding the flow of oil during the recovery and compression strokes of the aforementioned shock absorber, it can be seen that the oil flows through the second channel 31 inside the control valve 3. Therefore, a first filter element 51 and a second filter element 52 are respectively installed at the first inlet / outlet 311 and the second inlet / outlet 312 of the control valve 3. This ensures that the oil flows through the filter device 5 before entering the control valve 3 during the compression and recovery strokes, preventing impurities in the oil from entering the control valve 3 and clogging the second channel 31, thereby ensuring the stable operation of the shock absorber and ensuring the effective vibration damping function.

[0075] Shock absorbers have a significant impact on vehicle stability. In urban driving, they filter out minor road bumps; at high speeds, they enhance vehicle stability, significantly improving the riding experience. Beyond four-wheeled vehicles, shock absorbers are widely used in motorcycles, where good handling is a crucial performance indicator. Shock absorbers respond quickly to dynamic changes in the motorcycle, such as during cornering, acceleration, and braking, adjusting damping promptly to maintain vehicle stability, improve handling precision and responsiveness, and enhance the rider's control over the vehicle.

[0076] During the operation of existing shock absorbers, impurities generated due to friction between the sealing ring 42 and the inner wall of the cavity may enter the control valve 3, thereby jamming the valve core 32 inside the control valve 3 and preventing it from functioning properly. This causes the shock absorber to fail to adjust the damping force as expected, affecting the vehicle's comfort and handling. For example, when the shock absorber needs to adjust the damping force in a timely manner according to different road conditions during vehicle operation, if the control valve 3 cannot open or close properly due to impurities blocking the second channel 31, it cannot provide appropriate damping force, resulting in a worse driving experience and potentially affecting the vehicle's stability.

[0077] To ensure the proper functioning of the shock absorber, the existing filtration method involves installing a control valve 3 and a filter device 5 on the outside of the cylinder 1. This significantly increases the structural size and production cost of the shock absorber. Furthermore, during use, the control valve 3 may malfunction due to the shedding of metal parts, rubber parts, and wall-mounted impurities inside the cylinder 1, greatly reducing the service life of the shock absorber.

[0078] This invention relates to a shock absorber that integrates the control valve 3 and the filter device 5 within the cylinder 1, between the plug rod 2 and the plug body 4. This not only results in higher filtration efficiency but also a simpler and more compact structure, offering advantages such as lighter weight and better economy. During operation, impurities such as iron filings, abrasive particles, and rubber particles generated by the shock absorber are blocked within the first working chamber 11 or the second working chamber 12, preventing blockage of the second channel 31 inside the control valve 3 and ensuring the reliability of the control valve 3's operation.

[0079] The above description is merely a preferred embodiment of this utility model. Detailed explanations of configurations, examples of specific structural arrangements, and descriptions of assembly and connection methods are provided to ensure sufficient disclosure so that those skilled in the art can better implement this utility model, and are not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A piston assembly, characterized in that: It includes a cylinder (1), a piston that is slidably disposed in the inner cavity of the cylinder (1), and a control valve (3) and a filter device (5) disposed at the piston plug (4); The plug (4) divides the inner cavity into a first working chamber (11) and a second working chamber (12), and the plug (4) is provided with a first channel (41) for the oil in the inner cavity to flow between the first working chamber (11) and the second working chamber (12). The control valve (3) is used to regulate the flow rate of the oil through the first channel (41). The filter device (5) is arranged adjacent to the control valve (3) and filters the oil entering the control valve (3).

2. The piston assembly according to claim 1, characterized in that: The plug (4) has a first assembly groove (40) on the side facing the second working chamber (12), the first channel (41) is located at the bottom of the first assembly groove (40), and the control valve (3) is located at the opening of the first assembly groove (40). The control valve (3) has a second channel (31) with controllable flow rate inside. The first inlet (311) and the second inlet (312) at both ends of the second channel (31) are respectively connected to the first assembly groove (40) and the second working chamber (12).

3. The piston assembly according to claim 2, characterized in that: The filtering device (5) includes a first filter element (51) disposed in the first assembly groove (40), the first filter element (51) being isolated between the first channel (41) and the first inlet / outlet (311).

4. The piston assembly according to claim 3, characterized in that: The first filter element (51) includes an annular frame (511) and a first filter screen (512) provided on the annular frame (511); a boss (400) is provided on the side wall of the first assembly groove (40), and the annular frame (511) is pressed against the boss (400) by the control valve (3).

5. The piston assembly according to any one of claims 2 to 4, characterized in that: The piston rod (2) includes a rod body (21) located in the second working chamber (12) and a connecting portion (20) located at one end of the rod body (21) near the piston body (4); The connecting part (20) is provided with a second mounting groove (200) on the side facing the plug (4), and the end of the control valve (3) away from the plug (4) is inserted into the second mounting groove (200); The second inlet (312) is opened on the side wall of the control valve (3) and is located between the connection part (20) and the plug (4).

6. The piston assembly according to claim 5, characterized in that: The filtering device (5) includes a cylindrical second filter element (52), which is fitted onto the control valve (3). The two ends of the second filter element (52) abut against the plug (4) and the connecting part (20), respectively.

7. The piston assembly according to claim 6, characterized in that: The second filter element (52) includes a cylindrical frame (521) and a second filter screen (522) disposed on the cylindrical frame (521).

8. The piston assembly according to claim 7, characterized in that: Along the circumference of the cylindrical frame (521), a plurality of windows are provided at intervals on the cylindrical frame (521), and each of the windows is provided with the second filter screen (522).

9. The piston assembly according to claim 5, characterized in that: The two ends of the control valve (3) are screwed to the openings of the first assembly groove (40) and the second assembly groove (200), respectively.

10. A vibration damper, characterized in that: The shock absorber employs the piston assembly described in any one of claims 1 to 9.

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