A damper

Abstract

The present application belongs to the technical field of vibration reduction, and discloses a kind of shock absorber.The shock absorber monitors the temperature change of shock absorber medium in real time by detection piece, and automatically adjusts the spacing between one-way valve core and fastening plug using driving assembly, so that the damping force of shock absorber can be self-adaptively adjusted with medium temperature change.When the medium temperature rises and causes viscosity to reduce, the gap between one-way valve core and fastening plug is automatically reduced, and the damping force is increased to maintain the damping performance;When the medium temperature decreases and causes viscosity to increase, the gap between one-way valve core and fastening plug is automatically increased, to avoid the damping force being too large and affecting the damping comfort.The automatic adjustment mechanism effectively solves the problem of damping force fluctuation caused by temperature change in traditional shock absorber, so that the vehicle can maintain stable damping effect under different environmental temperatures.

Description

Technical Field

[0001] This invention relates to the field of vibration reduction technology, and more particularly to a vibration damper. Background Technology

[0002] Shock absorbers are the core component of a vehicle's suspension system. Their function is to suppress the rebound oscillations after the springs absorb the shocks and to buffer road impacts. During driving, the reciprocating motion generated by the shock-absorbing springs filtering road vibrations is attenuated by the damping force generated by the shock absorber, and the vibration energy is converted into heat energy and dissipated. Existing shock absorbers achieve damping through the flow of internal media. When the vehicle frame and axle move relative to each other, the piston inside the shock absorber moves back and forth in the cylinder, causing the internal media to flow through narrow orifices between different chambers. The friction between the media and the inner wall, as well as the intermolecular friction, together create the damping force, thereby achieving the vibration reduction effect.

[0003] The damping force is closely related to the density of the medium, which changes significantly with temperature. As vehicle travel time increases, the heat generated by the continuous operation of the shock absorber raises the temperature of the internal medium and lowers its density, resulting in a decrease in damping force, weakened damping effect, and increased vehicle bumps, affecting comfort and handling stability. Although some shock absorbers have damping adjustment functions, the adjustment structure is complex and cumbersome to operate, requiring specialized tools or vehicle disassembly. This makes it impossible to quickly and accurately adjust according to real-time changes in medium temperature, making it difficult to compensate for the decrease in damping force and ensuring that the shock absorber is always in optimal working condition. Summary of the Invention

[0004] The purpose of this invention is to provide a shock absorber that solves the problems of existing shock absorbers where the damping force weakens due to the decrease in medium density caused by temperature rise, and where adjustment is complex and cannot be made in real time and accurately. This invention aims to improve the stability and reliability of shock absorption and ensure vehicle comfort and handling.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A vibration damper includes a cylinder and a piston assembly. The piston assembly is slidably disposed within the inner cavity of the cylinder and divides the inner cavity into a first chamber and a second chamber. The piston assembly includes a piston body having a first fluid passage communicating between the first chamber and the second chamber. The vibration damper further includes:

[0007] A piston rod assembly includes a piston rod body and an adjusting rod. The piston rod body passes through the piston body and is fixedly connected to the piston body. The interior of the piston rod body forms a movable cavity that communicates with the first chamber. The adjusting rod is axially movable within the movable cavity. The side wall of the piston rod body has a first liquid passage hole that communicates with the movable cavity and the first liquid passage.

[0008] The regulating assembly includes a fastening plug and a one-way valve core arranged in sequence. The fastening plug is fixed to the first end of the piston rod and has a second liquid passage communicating with the first chamber. The one-way valve core is slidably arranged in the movable chamber and can be spaced apart from the fastening plug to form a liquid passage communicating with the first liquid passage hole.

[0009] The device includes a detection element for detecting the temperature of a medium and a drive assembly for communicating with the detection element. The drive assembly is disposed on the piston rod and can drive the adjusting rod to move axially along the piston rod and move the one-way valve core to adjust the distance between the one-way valve core and the fastened plug.

[0010] As an alternative to the vibration damper, the adjustment assembly also includes an adjustment core assembly, the two ends of which are elastically connected to the one-way valve core and the adjustment rod, respectively. The adjustment core assembly can selectively conduct, so that the medium flows into the first liquid passage through the second liquid passage, the one-way valve core and the adjustment core assembly.

[0011] The adjusting core assembly includes an adjusting seat, a core body, and a first elastic member. The adjusting seat has a third liquid passage that communicates with the second liquid passage. The core body has a fourth liquid passage that communicates with the movable cavity. The core body and the first elastic member are disposed in the third liquid passage. The inner wall of the third liquid passage has a first limiting part. The two ends of the first elastic member abut against the first limiting part and the core body, respectively. The core body can move along the third liquid passage to make the third liquid passage communicate with or cut off the fourth liquid passage.

[0012] As an alternative to the vibration damper, the side wall of the adjusting seat is provided with a second liquid passage hole, which is connected to the movable cavity. The side wall of the core is provided with a third liquid passage hole, which is connected to the fourth liquid passage channel. The core can move along the third liquid passage channel so that the second liquid passage hole and the third liquid passage hole are connected.

[0013] As an alternative to the vibration damper, the side wall of the movable cavity is provided with a second limiting part to limit the axial displacement of the adjusting seat along the movable cavity.

[0014] As an alternative to the vibration damper, the adjustment assembly includes a second elastic element, the two ends of which are respectively connected to the one-way valve core and the adjustment seat.

[0015] As an alternative to the shock absorber, the adjustment assembly includes a third elastic element, the two ends of which are respectively connected to the adjustment seat and the adjustment rod.

[0016] As an alternative to the shock absorber, the piston rod assembly also includes a sealing ring, and the side wall of the adjusting rod near the adjusting assembly is provided with a sealing groove, and the sealing ring is fitted inside the sealing groove.

[0017] As an alternative to the shock absorber, the drive assembly includes a motor and a cam. The motor is fixedly connected to the piston rod, and the output end of the motor is connected to the cam. The profile surface of the cam abuts against the adjusting rod.

[0018] As an alternative to the shock absorber, the end face of the cam away from the motor has a protrusion, and the piston rod has a groove, with the protrusion and the groove rotatably engaging.

[0019] As an alternative to the vibration damper, the piston assembly further includes a first valve plate and a second valve plate, which are respectively disposed at both ends of the piston body. The first valve plate is located in the first chamber, and the second valve plate is located in the second chamber.

[0020] The first liquid passage includes a first liquid outlet, a second liquid outlet, and a third liquid outlet. The first liquid outlet is connected to the first liquid orifice. The first valve plate can adjust the opening degree of the second liquid outlet, and the second valve plate can adjust the opening degree of the third liquid outlet.

[0021] Beneficial effects:

[0022] The shock absorber provided by this invention monitors the temperature change of the damping medium in real time through a detection element and automatically adjusts the gap between the one-way valve core and the fastening plug using a drive component, enabling the damping force of the shock absorber to adaptively adjust with changes in medium temperature. When the medium temperature rises and causes a decrease in viscosity, the gap between the one-way valve core and the fastening plug is automatically reduced, increasing the damping force to maintain damping performance; when the medium temperature decreases and causes an increase in viscosity, the gap between the one-way valve core and the fastening plug is automatically increased to avoid excessive damping force affecting damping comfort. This automatic adjustment mechanism effectively solves the problem of damping force fluctuation caused by temperature changes in traditional shock absorbers, enabling vehicles to maintain stable damping performance under different ambient temperatures. In addition, the shock absorber adopts a design with a built-in adjustment mechanism in the piston rod assembly, which is compact in structure and has high adjustment precision. While ensuring reliability and durability, it achieves dynamic optimization of damping performance, improving the smoothness of vehicle driving and handling stability. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the vibration damper provided in an embodiment of the present invention;

[0024] Figure 2 yes Figure 1 A magnified view of position A in the middle;

[0025] Figure 3 This is a first schematic diagram of the adjustment component provided in an embodiment of the present invention;

[0026] Figure 4This is a second schematic diagram of the adjustment component provided in an embodiment of the present invention;

[0027] Figure 5 This is a third schematic diagram of the adjustment component provided in an embodiment of the present invention;

[0028] Figure 6 This is a fourth schematic diagram of the adjustment component provided in an embodiment of the present invention;

[0029] Figure 7 This is a schematic diagram of the structure of the driving component provided in an embodiment of the present invention;

[0030] Figure 8 yes Figure 7 A cross-sectional diagram of the BB position.

[0031] In the picture:

[0032] 1. Cylinder; 11. Liquid inlet; 12. First chamber; 13. Second chamber;

[0033] 2. Piston assembly; 21. Piston body; 22. First valve plate; 23. Second valve plate; 211. First liquid passage; 2111. First liquid port; 2112. Second liquid port; 2113. Third liquid port;

[0034] 3. Piston rod assembly; 31. Piston rod body; 32. Adjusting rod; 33. Sealing ring; 311. Movable cavity; 312. First liquid passage hole; 313. Second limiting part; 314. Groove; 321. Sealing groove;

[0035] 4. Adjustment assembly; 41. Fastening plug; 42. One-way valve core; 43. Adjustment core assembly; 44. Second elastic element; 45. Third elastic element; 411. Second liquid passage; 431. Adjustment seat; 432. Core body; 433. First elastic element; 4311. Third liquid passage; 4312. First limiting part; 4313. Second liquid passage hole; 4321. Fourth liquid passage; 4322. Third liquid passage hole;

[0036] 5. Test items;

[0037] 6. Drive assembly; 61. Motor; 62. Cam; 63. Protrusion; 64. Motor mount. Detailed Implementation

[0038] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0039] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0040] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0041] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0042] A type of shock absorber, such as Figures 1-8As shown, the shock absorber includes a cylinder 1, a piston assembly 2, a piston rod assembly 3, an adjusting assembly 4, a detection element 5, and a drive assembly 6. The piston assembly 2 is slidably disposed within the inner cavity of the cylinder 1, dividing the inner cavity into a first chamber 12 and a second chamber 13. The piston assembly 2 includes a piston body 21, which has a first fluid passage 211 connecting the first chamber 12 and the second chamber 13. The piston rod assembly 3 includes a piston rod body 31 and an adjusting rod 32. The piston rod body 31 passes through the piston body 21 and is fixedly connected to the piston body 21. The interior of the piston rod body 31 forms a movable cavity 311 communicating with the first chamber 12. The adjusting rod 32 is axially movable within the movable cavity 311. The side wall of the piston rod body 31 has a connection between the movable cavity 311 and the piston rod body 32. The first liquid passage 211 has a first liquid passage hole 312; the adjusting assembly 4 includes a fastening plug 41 and a one-way valve core 42 arranged in sequence. The fastening plug 41 is fixed to the first end of the piston rod 31 and has a second liquid passage 411 communicating with the first chamber 12. The one-way valve core 42 is slidably arranged in the movable chamber 311 and can be spaced apart from the fastening plug 41 to form a liquid passage communicating with the first liquid passage hole 312; the detection element 5 is used to detect the medium temperature; the driving assembly 6 is communicatively connected to the detection element 5; the driving assembly 6 is arranged on the piston rod 31 and can drive the adjusting rod 32 to move along the axial direction of the piston rod 31, and drive the adjusting core assembly 43 and the one-way valve core 42 to move, so as to adjust the distance between the one-way valve core 42 and the fastening plug 41.

[0043] The temperature change of the damper medium is monitored in real time by the detection component 5, and the gap between the one-way valve core 42 and the fastening plug 41 is automatically adjusted by the drive component 6, so that the damping force of the damper can be adaptively adjusted according to the temperature change of the medium. When the medium temperature rises and the viscosity decreases, the gap between the one-way valve core 42 and the fastening plug 41 is automatically reduced to increase the damping force and maintain the damping performance; when the medium temperature drops and the viscosity increases, the gap between the one-way valve core 42 and the fastening plug 41 is automatically increased to avoid excessive damping force affecting the damping comfort. This automatic adjustment mechanism effectively solves the problem of damping force fluctuation caused by temperature changes in traditional dampers, so that the vehicle can maintain a stable damping effect under different ambient temperatures. In addition, the damper adopts a design with an integrated adjustment mechanism in the piston rod assembly 3, which is compact in structure and has high adjustment precision. While ensuring reliability and durability, it realizes dynamic optimization of damping performance, improving the smoothness of vehicle driving and handling stability.

[0044] Specifically, such as Figures 1-6As shown, cylinder 1 includes a liquid inlet 11 connected to the first chamber 12. A detection element 5 is fixed to the side wall of the liquid inlet 11. The detection element 5 monitors the temperature of the medium inside the damper in real time and transmits the signal to the drive assembly 6. When the drive assembly 6 drives the adjusting rod 32 to move according to the temperature signal, the one-way valve core 42 moves closer to or further away from the fastening plug 41, changing the annular gap between the one-way valve core 42 and the fastening plug 41. Since this annular gap is directly opposite the first liquid passage 312, when the medium enters the first liquid passage 312 from the first chamber 12 through the second liquid passage 411, it flows through this annular gap to the first liquid passage 211. When the annular gap decreases, the flow velocity of the medium passing through the annular gap increases significantly. According to Bernoulli's principle, the hydrostatic pressure decreases, creating a stronger throttling effect. This forces more medium to pass through the first fluid passage 211 on the piston body 21, significantly increasing the flow resistance and thus increasing the damping force. Conversely, when the annular gap increases, the medium flow velocity decreases, the throttling effect weakens, and more medium directly enters the first fluid passage 211 through the annular gap, reducing the flow resistance and correspondingly decreasing the damping force. This design translates temperature changes into precise adjustments to the geometry, enabling the vibration damper to maintain stable dynamic response characteristics under different operating conditions.

[0045] In this embodiment, the detection element 5 is a temperature sensor (thermocouple sensor or resistance temperature detector). The temperature sensor captures temperature changes, and the drive component 6 performs adjustment actions according to the temperature signal. The adjusted damping state will indirectly affect the flow of the medium and temperature stability, thereby ensuring that the vibration damper can maintain the preset performance indicators under different temperature environments.

[0046] like Figure 2 and Figure 3As shown, the regulating assembly 4 also includes a regulating core assembly 43. Both ends of the regulating core assembly 43 are elastically connected to the one-way valve core 42 and the regulating rod 32, respectively. The regulating core assembly 43 can selectively conduct, allowing the medium to flow through the second liquid passage 411, the one-way valve core 42, and the regulating core assembly 43 into the first liquid passage hole 312. The regulating core assembly 43 includes an regulating seat 431, a core 432, and a first elastic element 433. The regulating seat 431 is provided with a third liquid passage 4311 communicating with the second liquid passage 411. The body 432 is provided with a fourth liquid passage 4321 that communicates with the movable cavity 311. The core 432 and the first elastic member 433 are disposed within the third liquid passage 4311. The inner wall of the third liquid passage 4311 is provided with a first limiting part 4312. The two ends of the first elastic member 433 abut against the first limiting part 4312 and the core 432, respectively. The core 432 can move along the third liquid passage 4311 to make the third liquid passage 4311 communicate with or close the fourth liquid passage 4321. The third liquid passage 4311 of the adjusting seat 431 provides a moving track for the core 432, while the first limiting part 4312 restricts the position of the first elastic member 433, enabling it to stably apply elastic force to the core 432. The elastic force of the first elastic member 433 also makes the movement of the core 432 smoother, avoiding violent shaking of the core 432 due to sudden pressure changes, and ensuring the continuity of damping force adjustment.

[0047] In this embodiment, as Figures 2-6 As shown, the adjusting seat 431 is convex in shape and has a through convex third liquid passage 4311. A first limiting part 4312 formed at the change in its inner diameter cooperates with a similarly convex core 432 and a first elastic member 433 fitted onto the small diameter position of the core 432, forming the adjusting core assembly 43. The first elastic member 433 is fitted onto the small diameter position of the core 432, with its two ends abutting against the first limiting part 4312 and the stepped surface of the core 432, respectively. This provides a stable elastic force while preventing lateral displacement of the first elastic member 433 due to the spatial limitation at the small diameter position of the core 432, ensuring that the elastic force direction is always axial, making the movement of the core 432 within the third liquid passage 4311 smoother. The convex structure of the core 432 ensures that its large diameter position fits snugly against the corresponding section of the third liquid passage 4311, guaranteeing guidance during movement. One end of the fourth liquid passage 4321 extends through the end face of the core 432 at the large diameter position, and the other end of the fourth liquid passage 4321 is located on the side wall of the core 432 at the small diameter position. The diameter of the end face of the core 432 at the small diameter position is larger than the diameter of the third liquid passage 4311 at the small diameter position. As the core 432 moves axially, the third liquid passage 4311 can be opened and closed.

[0048] Specifically, the small-diameter end of the core 432 is designed as a conical structure with a smooth transition of the conical surface; correspondingly, the connection between the small diameter of the first limiting part 4312 and the third liquid passage 4311 is also processed into a matching conical surface to ensure that the two can form a sealed contact when they are fitted together.

[0049] like Figures 3-6 As shown, the side wall of the adjusting seat 431 is provided with a second liquid passage 4313, which is connected to the movable cavity 311. The side wall of the core 432 is provided with a third liquid passage 4322, which is connected to the fourth liquid passage 4321. The core 432 can move along the third liquid passage 4311 to connect the second liquid passage 4313 and the third liquid passage 4322. By moving the core 432 within the third liquid passage 4311, the dynamic change of the connection state between the two passages is achieved, thereby precisely controlling the flow resistance of the medium. When the core 432 moves and increases the overlapping area of ​​the second liquid passage 4313 and the third liquid passage 4322, more medium can flow through the channel formed by these two holes, and the overall flow resistance decreases accordingly, which can effectively avoid excessive damping force due to changes in medium characteristics. When the core 432 moves and decreases the overlapping area of ​​the two holes, the medium passing through the channel decreases, and more medium needs to pass through other damping channels, increasing the flow resistance, which can prevent the damping force from being excessively reduced due to changes in medium characteristics.

[0050] like Figures 2-6 As shown, the side wall of the movable cavity 311 is provided with a second limiting part 313, which is used to limit the axial displacement of the adjusting seat 431 along the movable cavity 311. As the main body of the adjusting core assembly 43, the positional stability of the adjusting seat 431 directly affects the fitting accuracy between the core 432 and the one-way valve core 42. By limiting the axial movement of the adjusting seat 431, the second limiting part 313 ensures that the adjusting seat 431 is always within the preset working range, avoiding excessive displacement of the adjusting seat 431 due to the driving of the adjusting rod 32 or the impact of the medium, thereby ensuring that the relative position of the third liquid passage 4311 and the fourth liquid passage 4321 is always within the effective adjustment range, providing a basis for the stable adjustment of the damping force. Furthermore, the presence of the second limiting part 313 makes the position of the adjusting seat 431 more fixed, so that the preload of the first elastic element 433 can act more stably on the core 432, avoiding adjustment deviation caused by the unstable force of the first elastic element 433, thereby ensuring the matching accuracy of the overlap of the two liquid passages with factors such as temperature and pressure, and finally achieving reliable control of the damping characteristics of the shock absorber.

[0051] like Figures 2-6As shown, the regulating component 4 includes a second elastic element 44, with its two ends connected to the one-way valve core 42 and the regulating seat 431, respectively. When the driving component 6 moves the regulating rod 32, the regulating seat 431 shifts accordingly. The second elastic element 44 will stretch or compress due to the change in the relative position between the one-way valve core 42 and the regulating seat 431. The force generated by this elastic deformation will assist the one-way valve core 42 in quickly responding to position adjustment, ensuring that the gap between the one-way valve core 42 and the fastening plug 41 can accurately match the changes in medium characteristics caused by temperature changes. For example, when the temperature rises sharply, the gap will be reduced more quickly to maintain damping force and avoid performance fluctuations caused by adjustment lag. At the same time, the second elastic element 44 can also buffer instantaneous fluctuations in medium pressure. When the vehicle encounters bumps and the medium pressure suddenly increases, the one-way valve core 42 will be subjected to an outward thrust. At this time, the second elastic element 44 will be compressed to absorb part of the impact force, preventing the one-way valve core 42 from rigidly colliding with the fastening plug 41 and protecting the component structure. When the pressure decreases, the rebound force of the elastic element will pull the one-way valve core 42 back to its original position, ensuring that the gap returns to a reasonable range and maintaining the stability of the damping adjustment. This bidirectional elastic connection allows the one-way valve core 42 to have sufficient flexibility to respond to external changes during adjustment, while maintaining precise coordination with other components under elastic constraints. This makes the operation of the entire adjustment assembly 4 smoother and the change of damping force more stable, further improving the adaptability and reliability of the shock absorber under complex working conditions.

[0052] like Figures 2-6 As shown, the adjusting component 4 includes a third elastic element 45, with its two ends connected to the adjusting seat 431 and the adjusting rod 32, respectively. When the driving component 6 moves the adjusting rod 32, the third elastic element 45 deforms with the relative displacement between the adjusting rod 32 and the adjusting seat 431. The elastic force generated by this deformation makes the displacement of the adjusting seat 431 smoother, preventing the rigid push of the adjusting rod 32 from causing excessive instantaneous force on the adjusting seat 431, thus protecting the mating structure between the adjusting seat 431 and the core 432 and reducing component wear. At the same time, the elastic force of the third elastic element 45 forms a preload force, ensuring that the adjusting seat 431 and the adjusting rod 32 always maintain an effective connection, preventing gaps caused by vibration or impact from affecting the adjustment accuracy. For example, when the vehicle is moving and there are bumps, the adjusting rod 32 may sway slightly due to vibration. The elasticity of the third elastic element 45 absorbs this swaying energy, preventing excessive interference with the position of the adjusting seat 431, ensuring the stable mating state between the core 432 and the liquid passage, and thus maintaining a stable output of damping force. In addition, when the drive assembly 6 stops operating, the preload of the third elastic element 45 can help the adjusting seat 431 and the adjusting rod 32 to remain in the preset position, preventing positional displacement due to gravity or other minor external forces, ensuring that the entire adjusting assembly 4 can maintain the best working state even when static, and improving the overall reliability of the shock absorber.

[0053] In this embodiment, the first end of the adjusting rod 32 is convex, and the third elastic element 45 is sleeved on the small diameter portion. The stepped surface formed by its large diameter provides axial limit for the third elastic element 45, preventing the elastic element from moving or falling off, and ensuring that the elastic force is stably transmitted along the axial direction. One end of the third elastic element 45 abuts against the stepped surface, and the other end is connected to the adjusting seat 431. When the driving component 6 pushes the adjusting rod 32 to move, the third elastic element 45 smoothly transmits the force to the adjusting seat 431 through compression or stretching, avoiding rigid impact. At the same time, the small diameter portion is adapted to the inner diameter of the third elastic element 45 to achieve precise radial positioning, reduce the sway of the elastic element, and make full use of the spatial advantage of the convex structure to make the component more compact. This allows the adjusting rod 32 to achieve effective displacement in a limited space, and avoids component interference caused by excessive displacement through elastic deformation buffering, ensuring the stability and efficiency of the adjusting system.

[0054] In this embodiment, the first elastic element 433 and the second elastic element 44 are springs, which need to move and extend flexibly with the movement of the components to provide continuous and variable elastic force to help the core 432 and the one-way valve core 42 adjust and buffer smoothly. The third elastic element 45 is a top spring, which is mainly responsible for pressing the adjusting seat 431 and the adjusting rod 32. It needs a stable preload to prevent the two from loosening and to ensure stable power transmission.

[0055] like Figure 2 As shown, the piston rod assembly 3 also includes a sealing ring 33. A sealing groove 321 is provided around the side wall of the adjusting rod 32 near the adjusting assembly 4, and the sealing ring 33 is fitted inside the sealing groove 321. The design of the sealing ring 33 on the adjusting rod 32, by tightly fitting the sealing ring 33 fitted inside the sealing groove 321 with the inner wall of the moving cavity 311 of the piston rod body 31, forms a reliable sealing structure, effectively preventing unnecessary leakage of the medium within the moving cavity 311. When the adjusting rod 32 moves axially, the sealing ring 33 always maintains tight contact with the side wall of the moving cavity 311, preventing the medium from leaking out from the gap between the adjusting rod 32 and the moving cavity 311, ensuring that the medium flows entirely along the preset liquid passage, thereby guaranteeing the accuracy of flow regulation. If leakage occurs, the actual amount of medium participating in damping regulation decreases, causing a deviation between the damping force and the expected value, affecting the shock absorber's response accuracy to temperature and road conditions. Simultaneously, the sealing ring 33 also reduces frictional loss during the movement of the adjusting rod 32. The annular structure of the sealing groove 321 provides a stable mounting base for the sealing ring 33, preventing the sealing ring 33 from shifting or falling off during the movement of the adjusting rod 32, thus ensuring the continuity of the sealing performance. The elastic material of the sealing ring 33 itself can form an effective seal when it comes into contact with the side wall of the movable cavity 311, and can also reduce the direct friction between the adjusting rod 32 and the cavity wall through its own deformation, making the movement of the adjusting rod 32 smoother, reducing the power loss of the drive assembly 6, and extending the service life of the components.

[0056] In this embodiment, the adjusting rod 32 is provided with two sealing grooves 321 spaced apart along the axial direction. The design of the double sealing grooves 321 further enhances the sealing performance between the adjusting rod 32 and the moving cavity 311 of the piston rod body 31. The two sealing rings 33 are respectively embedded in the corresponding sealing grooves 321 and fit tightly against the side wall of the moving cavity 311, forming a double barrier, which can more effectively prevent the medium from leaking through the gap during the movement of the adjusting rod 32. When the adjusting rod 32 moves along the axial direction, the two sealing rings 33 will move synchronously. Even if one sealing ring 33 experiences slight wear or a decrease in sealing performance due to long-term use, the other sealing ring 33 can still maintain the sealing effect, avoiding the impact of medium leakage on the flow regulation accuracy, thereby extending the overall service life of the sealing structure.

[0057] like Figure 1 and Figure 7 As shown, the drive assembly 6 includes a motor 61 and a cam 62. The motor 61 is fixedly connected to the piston rod 31, and the output end of the motor 61 is connected to the cam 62. The profile surface of the cam 62 can abut against the adjusting rod 32. The fixed connection between the motor 61 and the piston rod 31 ensures the installation stability of the entire drive structure. When the motor 61 starts, the output end drives the cam 62 to rotate, and the profile surface of the cam 62 abuts against the adjusting rod 32. As the cam 62 rotates, its eccentric structure pushes the adjusting rod 32 to move axially. When the different positions of the cam 62 profile contact the adjusting rod 32, the resulting change in thrust is converted into the linear displacement of the adjusting rod 32. This design can efficiently convert the rotational motion of the motor 61 into the axial motion of the adjusting rod 32, thereby precisely controlling the gap between the one-way valve core 42 and the fastening plug 41. The profile design of cam 62 directly affects the displacement accuracy of adjusting rod 32. By optimizing the profile curve, the movement of adjusting rod 32 can correspond to the rotation angle of motor 61. For example, when the temperature change is small, cam 62 pushes adjusting rod 32 to produce a small displacement, while when the temperature changes significantly, it drives adjusting rod 32 to produce a larger displacement, achieving linear adjustment of damping force. In this embodiment, drive assembly 6 also includes motor mount 64, and motor 61 is installed in motor mount 64. Motor mount 64 is bolted or snap-fitted to piston rod body 31.

[0058] In this embodiment, motor 61 is a geared motor. The low-speed, high-torque characteristics of the geared motor are suitable for the damper adjustment requirements, and can provide stable thrust to overcome high-pressure resistance, ensuring smooth movement of the adjusting rod 32; the low speed, combined with the elastic element buffer, reduces damping force fluctuations.

[0059] like Figure 7 and Figure 8As shown, the end face of the cam 62 away from the motor 61 has a protrusion 63, and the piston rod body 31 has a groove 314. The protrusion 63 and the groove 314 are rotatably engaged. The protrusion 63 is embedded in the groove 314, forming an auxiliary support point, which can effectively limit the radial offset of the cam 62 during rotation, ensuring that the profile surface of the cam 62 always maintains a stable contact with the adjusting rod 32, avoiding uneven force or displacement deviation of the adjusting rod 32 due to cam 62 shaking, thereby ensuring the axial movement accuracy of the adjusting rod 32 and making the gap adjustment between the one-way valve core 42 and the fastening plug 41 more precise. At the same time, this rotatable engagement structure can also disperse the force generated when the cam 62 rotates. When the motor 61 drives the cam 62 to rotate, the cam 62 will be subjected to the reaction thrust of the adjusting rod 32. The engagement of the protrusion 63 and the groove 314 can transfer part of the force to the piston rod body 31, reducing the force burden on the output end of the motor 61, avoiding damage to the motor 61 due to long-term radial force, and extending the service life of the drive assembly 6. In addition, the cooperation between the protrusion 63 and the groove 314 can guide the rotation trajectory of the cam 62, making the rotation of the cam 62 more stable, reducing noise and component wear caused by vibration, ensuring the smoothness of the entire driving process, and thus improving the reliability and stability of the damper damping adjustment.

[0060] In this embodiment, as Figure 7 and Figure 8 As shown, the protrusion 63 is cylindrical and coaxial with the output shaft of the motor 61. A bearing is provided between the protrusion 63 and the groove 314. The inner ring of the bearing is fixedly connected to the protrusion 63, and the outer ring of the bearing is fixedly connected to the groove 314. The coaxiality of the cylindrical protrusion 63 with the output shaft of the motor 61 allows the axis of the cam 62 to be aligned with the axis of the adjusting rod 32 when the cam 62 rotates, ensuring accurate displacement of the adjusting rod 32. The bearing between the protrusion 63 and the groove 314 transforms sliding friction into rolling friction, reducing resistance and allowing the cam 62 to rotate more smoothly. It also disperses radial force, reduces wear, prevents the cam 62 from slipping, and makes the drive more stable.

[0061] like Figure 2As shown, the piston assembly 2 also includes a first valve plate 22 and a second valve plate 23, which are respectively disposed at both ends of the piston body 21. The first valve plate 22 is located in the first chamber 12, and the second valve plate 23 is located in the second chamber 13. The first liquid passage 211 includes a first liquid outlet 2111, a second liquid outlet 2112, and a third liquid outlet 2113. The first liquid outlet 2111 communicates with the first liquid passage hole 312. The first valve plate 22 can adjust the opening degree of the second liquid outlet 2112, and the second valve plate 23 can adjust the opening degree of the third liquid outlet 2113. When the piston assembly 2 moves towards the first chamber 12 (compression stroke), the pressure in the first chamber 12 increases, pushing the first valve plate 22 closer to the piston body 21, further narrowing (but not completely closing) the original gap of the second liquid outlet 2112. At this time, the resistance of the medium flowing through the narrowed gap increases, which increases the damping force of the compression stroke by limiting the flow area. At the same time, the pressure in the second chamber 13 decreases, and the gap between the second valve plate 23 and the piston body 21 widens under the action of the pressure difference, making the return flow of the medium through the third liquid outlet 2113 smoother and reducing the resistance in the stretching direction. When the piston assembly 2 moves towards the second chamber 13 (stretching stroke), the pressure direction reverses, and the second valve plate 23 moves closer to the piston body 21 under pressure, narrowing the gap of the third liquid outlet 2113 and increasing the damping force of the stretching stroke. Meanwhile, the gap between the first valve plate 22 and the piston body 21 widens under the reverse pressure, making the return flow of the medium through the second liquid outlet 2112 smoother and ensuring flexible response in the compression direction.

[0062] In this embodiment, the first and second valve plates are elastic valve plates. The elastic valve plates allow the changes in the opening degree of the second and third liquid passages to be linearly correlated with the pressure, resulting in more precise matching between the medium pressure and the damping force. Even under high-frequency vibration conditions, the valve plates can respond to pressure fluctuations through rapid elastic deformation, avoiding abrupt changes in the gap and ensuring the continuity and smoothness of the damping force adjustment.

[0063] In summary, the vibration damper provided in this embodiment, taking the movement of the piston assembly 2 towards the first chamber 12 as an example, involves a portion of the medium flowing directly through the first liquid passage 211 to the second chamber 13 via the gap between the first valve plate 22 and the second liquid outlet 2112, while another portion of the medium flows to the second chamber 13 via the regulating assembly 4. The working process of this portion of the medium flowing to the second chamber 13 via the regulating assembly 4 can be divided into the following two working conditions:

[0064] Operating Condition 1: When the temperature of the medium detected by sensor 5 does not exceed the threshold, the vibration damper adaptively adjusts according to the change in medium pressure, such as... Figures 3-5 As shown.

[0065] Phase 1 ( Figure 3As piston assembly 2 moves toward first chamber 12, the pressure in first chamber 12 increases, and the medium passes sequentially through the second liquid passage 411 of fastening plug 41, one-way valve core 42, third liquid passage 4311 of adjusting seat 431, and fourth liquid passage 4321 of core 432, and finally flows into the oil storage area between adjusting rod 32 and adjusting seat 431 (between adjusting seat 431 and sealing ring 33 in movable chamber 311). At this time, fastening plug 41 abuts against one-way valve core 42, and adjusting seat 431 abuts against and is limited by second limiting part 313.

[0066] Phase Two ( Figure 4 When the pressure of the medium in the oil storage area exceeds the elastic force of the first elastic element 433, the core 432 is pushed and compressed, causing the second liquid passage 4313 to connect with the third liquid passage 4322. The medium then flows into the first liquid passage 312 through the gap between the adjusting seat 431 and the cavity wall of the movable cavity 311, and then enters the second chamber 13 through the first liquid passage 211. At this time, the fastening plug 41 abuts against the one-way valve core 42, and the adjusting seat 431 abuts against the second limiting part 313 for limiting.

[0067] Phase Three ( Figure 5 As the pressure in the first chamber 12 continues to rise, the one-way valve core 42 is pushed by the medium in the second liquid passage 411, forming an annular gap with the fastening plug 41. Part of the medium passes through the annular gap, enters the first liquid passage 211 through the first liquid passage hole 312, and flows into the second chamber 13. At this time, the adjusting seat 431 abuts against the second limiting part 313 and is limited. Under the pre-tightening force of the first elastic member 433 and the second elastic member 44, the second liquid passage hole 4313 and the third liquid passage hole 4322 are intermittently misaligned and connected according to the medium pressure.

[0068] Operating Condition 2: When the temperature of the medium detected by the test piece 5 exceeds the threshold, such as... Figure 6 As shown. When the drive assembly 6 is activated, the cam 62 pushes the adjusting rod 32 to move axially, thereby driving the adjusting seat 431 and the core 432 to move synchronously. This adjusts the size of the annular gap between the one-way valve core 42 and the fastening plug 41, compensating for insufficient flow (or abnormal pressure loss, etc.) caused by the decrease in density due to the increase in medium temperature. At this time, the third liquid passage 4311 is blocked by the core 432, and the medium enters the first liquid passage 211 through the first liquid passage hole 312 through the annular gap and flows into the second chamber 13, thereby realizing the damping force adjustment under high temperature conditions.

[0069] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A shock absorber comprising a cylinder (1) and a piston assembly (2) which is slidably provided in an inner cavity of the cylinder (1) and divides the inner cavity into a first chamber (12) and a second chamber (13), the piston assembly (2) comprising a piston body (21) provided with a first liquid passage (211) communicating the first chamber (12) and the second chamber (13), characterized in that, The shock absorber further comprises: a piston rod assembly (3) comprising a piston rod body (31) and an adjusting rod (32), the piston rod body (31) penetrating through the piston body (21) and being fixedly connected with the piston body (21), an inner portion of the piston rod body (31) being formed with a movable cavity (311) in communication with the first cavity (12), the adjusting rod (32) being movably arranged in the movable cavity (311), and a side wall of the piston rod body (31) being provided with a first liquid passage (312) in communication with the movable cavity (311) and the first liquid passage (211); an adjusting assembly (4) comprising a fastening plug (41) and a one-way valve core (42) arranged in sequence, the fastening plug (41) being fixed to a first end of the piston rod body (31) and being provided with a second liquid passage (411) in communication with the first cavity (12), and the one-way valve core (42) being slidably arranged in the movable cavity (311) and being capable of being spaced apart from the fastening plug (41) to form a liquid passage in communication with the first liquid passage (312); a detection member (5) for detecting a medium temperature and a driving assembly (6) in communication connection with the detection member (5), the driving assembly (6) being arranged on the piston rod body (31) and being capable of driving the adjusting rod (32) to move along an axial direction of the piston rod body (31) and driving the one-way valve core (42) to move so as to adjust a distance between the one-way valve core (42) and the fastening plug (41); the adjusting assembly (4) further comprises an adjusting core group (43), two ends of the adjusting core group (43) being elastically connected with the one-way valve core (42) and the adjusting rod (32) respectively, and the adjusting core group (43) being capable of being selectively conducted to allow the medium to flow into the first liquid passage (312) through the second liquid passage (411), the one-way valve core (42) and the adjusting core group (43); the adjusting core group (43) comprises an adjusting seat (431), a core body (432) and a first elastic member (433), the adjusting seat (431) is provided with a third liquid passage (4311) in communication with the second liquid passage (411), the core body (432) is provided with a fourth liquid passage (4321) capable of being conducted with the movable cavity (311), the core body (432) and the first elastic member (433) are arranged in the third liquid passage (4311), an inner wall of the third liquid passage (4311) is provided with a first limiting portion (4312), two ends of the first elastic member (433) are respectively abutted against the first limiting portion (4312) and the core body (432), and the core body (432) is capable of moving along the third liquid passage (4311) to make the third liquid passage (4311) conducted with or cut off from the fourth liquid passage (4321).

2. The damper of claim 1, wherein The side wall of the adjusting seat (431) is provided with a second liquid passing hole (4313) in communication with the movable cavity (311), and the side wall of the core (432) is provided with a third liquid passing hole (4322) in communication with the fourth liquid passing channel (4321), and the core (432) can move along the third liquid passing channel (4311) to make the second liquid passing hole (4313) and the third liquid passing hole (4322) communicate.

3. The damper of claim 1, wherein The side wall of the movable cavity (311) is provided with a second limiting part (313) for limiting the axial displacement of the adjusting seat (431) along the movable cavity (311).

4. The damper of claim 1, wherein The adjusting assembly (4) comprises a second elastic member (44), and two ends of the second elastic member (44) are connected to the one-way valve core (42) and the adjusting seat (431) respectively.

5. The damper of claim 1, wherein The adjusting assembly (4) comprises a third elastic member (45), and two ends of the third elastic member (45) are connected to the adjusting seat (431) and the adjusting rod (32) respectively.

6. The damper of claim 1, wherein The piston rod assembly (3) further comprises a sealing ring (33), and the side wall of one end of the adjusting rod (32) close to the adjusting assembly (4) is provided with a sealing groove (321), and the sealing ring (33) is sleeved in the sealing groove (321).

7. The damper of claim 1, wherein The driving assembly (6) comprises a motor (61) and a cam (62), the motor (61) is fixedly connected with the piston rod body (31), the output end of the motor (61) is connected with the cam (62), and the profile surface of the cam (62) abuts against the adjusting rod (32).

8. The damper of claim 7, wherein The end face of one end of the cam (62) away from the motor (61) is provided with a protruding part (63), the piston rod body (31) is provided with a groove (314), and the protruding part (63) is rotationally matched with the groove (314).

9. Damper according to any of claims 1-8, characterized in that The piston assembly (2) further comprises a first valve plate (22) and a second valve plate (23), the first valve plate (22) and the second valve plate (23) are arranged at two ends of the piston body (21) respectively, the first valve plate (22) is located in the first cavity (12), and the second valve plate (23) is located in the second cavity (13). The first liquid passing channel (211) comprises a first liquid passing opening (2111), a second liquid passing opening (2112) and a third liquid passing opening (2113), the first liquid passing opening (2111) is in communication with the first liquid passing hole (312), the first valve plate (22) can adjust the opening degree of the second liquid passing opening (2112), and the second valve plate (23) can adjust the opening degree of the third liquid passing opening (2113).

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