An oil seal air release device for a shock absorber

Abstract

The application provides an oil seal degassing device for a shock absorber, and belongs to the technical field of vehicle shock absorbers. The oil seal degassing device for a shock absorber provides an integrated installation carrier for the insertion part and the force applying part through the embedded body, and does not need to rely on large production line equipment. The force applying part can directly receive manual external force, so as to push the insertion part to be embedded between the oil seal and the piston rod. The thickness of the insertion part gradually increases from bottom to top, which can ensure that the insertion part is smoothly inserted downward, and can form a gradually expanding gap between the oil seal and the piston rod, so as to realize the degassing of the working cavity and achieve simple and convenient operation. The above gap is used to directly and slowly discharge the excess gas in the working cavity through the upper part of the oil seal, which will not cause the cavity gas to be instantaneously completely discharged, and will not disturb the stable gas-liquid state in the working cavity, thereby saving the processes of recharging and secondary standing, greatly shortening the test cycle, and significantly improving the test efficiency.

Description

Technical Field

[0001] This application belongs to the field of automotive shock absorber technology, and more specifically, relates to an oil seal venting device for shock absorbers. Background Technology

[0002] Shock absorbers in a car's suspension system are installed at the suspension connection between the vehicle frame and the wheels. They function to suppress vibrations and maintain vehicle stability. Their structural design directly affects damping performance and operational stability. A shock absorber typically consists of a cylinder, a piston, and a piston rod. One end of the piston rod extends outside the shock absorber to connect to the component to be damped (such as the vehicle suspension), while the other end is fixed to the piston and placed inside the cylinder. The cylinder contains a closed working chamber filled with oil and gas. The damping effect is achieved by the damping effect of the oil flowing through the cylinder channels during the reciprocating motion of the piston.

[0003] To verify the damping performance and sealing reliability of the shock absorber under actual working conditions, a pneumatic pressure test is required. During the test, the working chamber needs to be filled with gas at the corresponding pressure value according to the specific product parameters, and it needs to be left to stand for 24-36 hours to allow the gas pressure and sealing state inside the chamber to stabilize. Afterwards, to meet the pressure requirements of the test, the working chamber needs to be re-filled and deflated to eliminate the inflation error.

[0004] In existing technologies, special equipment on the production line is usually used to vent the working chamber. However, this equipment will release all the gas in the chamber at once and then refill it with an adjusted amount of gas. This requires the chamber to stand for another 24-36 hours to stabilize the state of the chamber again. This process greatly prolongs the test cycle of the vibration damper, resulting in a significant reduction in test efficiency and seriously affecting the research and development and testing progress of vibration damper products. Utility Model Content

[0005] The purpose of this application is to provide an oil seal venting device for vibration dampers, which can solve the technical problem in the prior art that after venting the working chamber, it is necessary to refill it and allow it to stand for a second time, which leads to a significant increase in the test cycle and a reduction in test efficiency.

[0006] To achieve the above objectives, the technical solution adopted in this application is: to provide an oil seal venting device for a shock absorber, including an insert body, the insert body having an insertion portion, the thickness of the insertion portion gradually increasing from bottom to top, so that after being inserted from top to bottom between the oil seal and the piston rod of the shock absorber, a gradually expanding gap is formed between the oil seal and the piston rod to achieve venting; The insert body also has a force-applying part, which is connected to the insertion part. The force-applying part is used to receive external force to push the insertion part into the oil seal and the piston rod.

[0007] In existing technologies, specialized equipment on the production line is typically used to vent the working chamber. However, using this equipment requires fully opening the lip of the oil seal, which instantly releases all the gas inside the chamber. The chamber is then refilled with an adjusted inflation rate. After refilling, the chamber needs to stand for 24-36 hours to stabilize, significantly extending the testing cycle of the vibration damper, resulting in a substantial decrease in testing efficiency and delaying the research and development and testing progress of vibration damper products.

[0008] The beneficial effects of the oil seal venting device for vibration dampers provided in this application are as follows: Compared with the prior art, the oil seal venting device for vibration dampers in this application provides an integrated installation carrier for the insertion part and the force application part, without relying on large production line equipment; the force application part can directly bear manual external force, which can push the insertion part to be inserted between the oil seal and the piston rod. At the same time, the thickness of the insertion part gradually increases from bottom to top, which can not only ensure that the insertion part is smoothly inserted downward, but also form a gradually expanding gap between the oil seal and the piston rod to achieve venting of the working chamber. The operation is simple and convenient; the excess gas in the working chamber is slowly discharged directly through the gap above the oil seal, which will not cause the gas in the chamber to be completely emptied at once, nor will it disturb the stable gas-liquid state in the working chamber, thereby eliminating the process of refilling and secondary settling, greatly shortening the test cycle and significantly improving the test efficiency.

[0009] In one possible implementation, the insert body further includes a connecting portion, which is an elongated member, and the insertion portion is located at the lower end of the connecting portion. The thickness of the connecting portion is not less than the thickness of the upper end of the insertion portion. The force-applying part is located at the upper end of the connecting part and has a force-applying plane, which is perpendicular to the length direction of the connecting part.

[0010] In the above technical solution, the connecting part serves as an intermediate connecting component between the insertion part and the force-applying part, and also undertakes the function of stably transmitting external force from the force-applying part to the insertion part; the thickness of the connecting part is not less than the thickness of the upper end of the insertion part, which can provide sufficient rigid support; the force-applying plane provides a flat force-bearing area, and its perpendicular setting to the length direction of the connecting part ensures that the external force on the force-applying part can be effectively transmitted to the insertion part along the insertion direction of the insertion part, thereby ensuring that the insertion part is stably inserted.

[0011] In some embodiments, the insertion part and the connecting part are integrally connected. The insertion part has an inner contact surface and an outer pressure surface that are disposed opposite to each other. The inner contact surface is disposed towards the piston rod, and the outer pressure surface gradually slopes towards the inner contact surface from top to bottom. The inner contact surface is flush with the side of the connecting part facing the piston rod, and the outer pressure surface is flush with the side of the connecting part away from the piston rod.

[0012] In the above technical solution, the outer pressure surface gradually slopes towards the inner contact surface from top to bottom, forming a wedge-shaped guide structure. This allows the inclined surface to guide the insertion part to easily insert between the oil seal and the piston rod during insertion, reducing insertion resistance. The integral connection between the insertion part and the connecting part, and the flush arrangement of the inner contact surface, outer pressure surface, and two corresponding side surfaces of the connecting part, enable the integral processing and molding of the insertion part and the connecting part, significantly improving processing convenience.

[0013] In some embodiments, the inner contact surface is a concave arc surface, which is used to fit against the outer peripheral surface of the piston rod; the outer pressure surface is a convex arc surface, which is adapted to the inner peripheral surface of the oil seal.

[0014] In the above technical solution, the concave arc surface increases the contact area between the inner contact surface and the outer circumferential surface of the piston rod, enabling the insertion part to move more stably downward along the outer circumferential surface of the piston rod and avoiding the deflection of the insertion part. The convex arc surface is perfectly matched with the inner circumferential surface of the oil seal, which can evenly distribute the extrusion force during insertion to the entire contact area of ​​the inner circumference of the oil seal, avoiding excessive local stress and thus protecting the inner circumferential surface of the oil seal from being crushed and damaged.

[0015] In some embodiments, the insertion portion has a first side and a second side disposed opposite to each other, the first side and the second side being disposed at an angle to the inner surface, and the first side and the second side being inclined towards each other from top to bottom.

[0016] In the above technical solution, the first side and the second side are inclined to each other from top to bottom, so that the cross-sectional size of the insertion part gradually decreases from top to bottom, and finally forms a wedge-shaped tip that is wide and thick at the top and thin at the bottom. This can accurately align with the contact surface of the interference fit between the oil seal and the piston rod. The test personnel only need to apply a small external force to complete the alignment and insertion of the insertion part, which greatly improves the smoothness of operation.

[0017] In some embodiments, the force-applying part includes a force-applying block, which is integrally connected to the upper end of the connecting part, and the force-applying plane is the upper surface of the force-applying block.

[0018] In the above technical solution, the integrated connection between the force-applying block and the connecting part strengthens the overall structural rigidity, ensuring that the force-applying block and the connecting part always maintain a fixed relative position, and ensuring that the external force can be accurately transmitted to the insertion part along the length direction of the connecting part, avoiding the risk of misaligned insertion.

[0019] In some embodiments, the connecting portion is further provided with a reinforcing portion, which supports the bottom of the force-applying block.

[0020] In the above technical solution, the reinforcing part can evenly distribute the external force borne by the force-applying block to a larger area of ​​the connecting part, avoiding stress concentration at the connection between the connecting part and the force-applying block and thus preventing fracture, and significantly improving the rigidity and fatigue resistance of the overall structure.

[0021] In some embodiments, the reinforcing part includes two reinforcing ribs, which are respectively connected to the two side end faces of the connecting part, and the top of the reinforcing ribs is connected to the bottom of the force-applying block.

[0022] In the above technical solution, the two reinforcing ribs can simultaneously transfer the external force borne by the force-applying block to the connection part from both sides of the width direction of the connection part, avoiding stress concentration caused by unilateral force, significantly improving the bending and fracture resistance of the connection position between the force-applying block and the connection part, and extending the overall service life of the venting device.

[0023] In some embodiments, the insertion part is further provided with an air guide channel, the upper opening of which is located above the insertion part and communicates with the outside, for exporting gas from the working chamber of the shock absorber.

[0024] In the above technical solution, the air guide channel can directly discharge the gas in the working chamber of the shock absorber from the upper opening located above the insertion part, avoiding the problem of poor exhaust and unstable speed caused by the air release gap formed by the insertion of the insertion part being blocked by oil stains, thus ensuring a stable and efficient air release process.

[0025] In some embodiments, the air guiding channel is an air guiding groove, which is disposed on the inner surface and extends upward through the force-applying block to form the upper opening of the air guiding channel.

[0026] In the above technical solution, the air guide groove can directly receive the gas in the working chamber of the shock absorber and discharge it from the upper opening located on the force application block. The exhaust path is short and will not be blocked or obstructed, ensuring the smoothness of the exhaust path. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a structural schematic diagram of an oil seal venting device for a shock absorber in use, provided in an embodiment of this application. Figure 2 Examples of this application Figure 1 A schematic diagram of the cross-sectional structure; Figure 3This is a schematic diagram of the structure of an oil seal venting device for a shock absorber provided in an embodiment of this application; Figure 4 This is a schematic diagram of the structure of an oil seal venting device for a shock absorber from another angle, provided in an embodiment of this application. Figure 5 This is a schematic diagram of the usage state of another embodiment of the oil seal venting device for a shock absorber provided in this application.

[0029] In the picture: 1. Insertion body; 11. Insertion part; 111. Inner contact surface; 112. Outer pressure surface; 113. First side surface; 114. Second side surface; 12. Force application part; 121. Force application plane; 122. Force application block; 123. Movable block; 124. Insertion rod; 125. Spring retainer; 13. Connecting part; 2. Air guide groove; 3. Reinforcing rib block; 10. Oil seal; 101. Tightening spring; 102. Upper lip; 103. Lower lip; 20. Piston rod; 30. Cylinder body. Detailed Implementation

[0030] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0031] It should be noted that when an element is referred to as being "set on" another element, it can be directly on or indirectly on that other element. It should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0032] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0033] For ease of description, the up and down direction defined in the embodiments of this application refers to the attached... Figure 1 The displayed up and down direction can be selected when the shock absorber is deflated. The cylinder 30 of the shock absorber is placed stably on the workbench plane. At this time, the piston rod 20 extends upward, that is, one side of the piston rod 20 is up and the other side of the cylinder 30 is down.

[0034] As a core component in automotive suspension systems used to suppress vibrations and shocks, the structural design of a shock absorber directly affects its damping performance and operational stability. A shock absorber typically consists of a cylinder, a reciprocating piston, and a piston rod connecting the piston. One end of the piston rod extends outside the shock absorber to connect to the component to be damped (such as the vehicle suspension), while the other end, connected to the piston, is placed inside the cylinder. The cylinder contains a closed working chamber filled with oil and gas. The damping effect is achieved through the damping action of the oil flowing through the cylinder's channels during the piston's reciprocating motion.

[0035] Because the working chamber needs to be kept closed to prevent oil and gas leakage, an oil seal is specially installed at the part of the piston rod that extends out of the cylinder. This oil seal is the core of the shock absorber's sealing system. The oil seal typically has an upper lip and a lower lip, which are press-fitted to the outer circumference of the piston rod to form a basic sealing structure. At the same time, a tightening spring is also fitted around the outer circumference of the upper and lower lips of the oil seal. The tightening spring applies a continuous radial compressive force to the corresponding lip through its own elasticity, forcing the lip to fit tightly against the outer circumference of the piston rod, further enhancing the sealing performance and ensuring that the medium in the working chamber does not leak along the gap between the piston rod and the cylinder.

[0036] During the production of vibration dampers, air pressure tests are required to verify their damping performance and sealing reliability under actual operating conditions. Because the damping force requirements vary for different specifications of vibration dampers, the working chamber must be filled with gas at a pressure corresponding to the specific product parameters during testing. Since the gas is compressed during inflation, causing its temperature to rise, and temperature changes directly affect gas pressure, and the oil and gas also need to undergo a pressure equilibrium process, the chamber must be left to stand for 24-36 hours after inflation to allow the air pressure within the working chamber to stabilize, thereby ensuring the accuracy of subsequent damping force and other test data.

[0037] In addition, during inflation, the actual inflation volume may differ from the test requirements due to environmental factors and the amount of oil in the working chamber of the shock absorber. Usually, the actual inflation volume is greater than the test requirements, which will lead to errors in subsequent test data such as damping force. Therefore, after the air pressure stabilizes, the working chamber needs to be deflated and adjusted.

[0038] In existing technologies, specialized equipment on the production line is typically used to vent the working chamber. However, using this equipment requires fully opening the lip of the oil seal, instantly releasing all the gas inside the chamber. The chamber is then refilled with an adjusted inflation rate until the stable pressure reaches the target pressure value required for the test. After refilling, the chamber still needs to be left to stand for 24-36 hours to stabilize before subsequent tests can be conducted. These two prolonged standing periods significantly extend the testing cycle of the vibration damper, resulting in a substantial decrease in testing efficiency and delaying the research and development and testing progress of the vibration damper product.

[0039] To resolve the above issues, please refer to the following: Figures 1 to 5 The present application provides a description of an oil seal venting device for a shock absorber. The shock absorber oil seal venting device includes an insert body 1, which has an insertion portion 11. The thickness of the insertion portion 11 gradually increases from bottom to top, so that after being inserted from top to bottom between the oil seal 10 and the piston rod 20 of the shock absorber, a gradually expanding gap is formed between the oil seal 10 and the piston rod 20 to achieve venting. The insert body 1 also has a force-applying portion 12, which is connected to the insertion portion 11. The force-applying portion 12 is used to receive external force to push the insertion portion 11 into the space between the oil seal 10 and the piston rod 20.

[0040] This application provides an oil seal venting device for a vibration damper. Compared with the prior art, the insert body 1 provides an integrated mounting carrier for the insertion part 11 and the force application part 12, eliminating the need for large production line equipment. The force application part 12 can directly bear manual external force, which can push the insertion part 11 to be inserted between the oil seal 10 and the piston rod 20. At the same time, the thickness of the insertion part 11 gradually increases from bottom to top, which can ensure that the insertion part 11 is smoothly inserted downwards and form a gradually expanding gap between the oil seal 10 and the piston rod 20 to achieve venting of the working chamber. The operation is simple and convenient. The excess gas in the working chamber is slowly discharged directly through the gap above the oil seal 10, which will not cause the gas in the chamber to be completely emptied at once, nor will it disturb the stable gas-liquid state in the working chamber. This eliminates the need for refilling and secondary settling, greatly shortens the test cycle, and significantly improves the test efficiency.

[0041] It should be noted that after the initial inflation of the shock absorber's working chamber is completed and it has been allowed to stand for 24-36 hours, the oil in the working chamber remains at the bottom while the gas floats at the top, achieving effective gas-liquid separation. At this time, with the insertion of the insertion part 11, controllable micro-gaps are formed between the upper lip 102 of the oil seal 10 and the piston rod 20, and between the lower lip 103 and the piston rod 20, respectively. This allows excess gas in the working chamber to slowly escape along these gaps, facilitating precise control of the venting volume without creating impact force or disturbing the separation of the oil and gas.

[0042] When the venting volume reaches the target value, the insertion part 11 is smoothly pulled out by applying reverse force to the force application part 12. Under the action of the radial force of the tightening spring 101, the upper lip 102 and lower lip 103 of the oil seal 10 can automatically restore the interference fit with the piston rod 20, ensuring the integrity and sealing performance of the original sealing structure, thereby completing the venting. Throughout the venting process, the uniformity of air pressure and the sealing state in the working chamber remain stable. The air pressure conditions in the chamber after venting can effectively meet the preset test requirements, and subsequent air pressure-related tests can be carried out directly. This completely eliminates the steps of refilling and second settling after venting using production line equipment (dedicated equipment for production lines) in the existing technology, greatly shortening the test cycle of the vibration damper and ensuring the smooth progress of the research and development and testing of the vibration damper product.

[0043] It is understood that the venting device in this embodiment can adjust the gap size by controlling the insertion depth of the insertion part 11: the deeper the insertion, the larger the gap, the faster the venting speed, and the greater the exhaust volume; the shallower the insertion, the smaller the gap, the smoother the venting, and the easier it is to control the exhaust volume. The adjustment of the gap size makes the venting process controllable, enabling precise adjustment of the exhaust volume and venting speed of the shock absorber's working chamber, quickly stabilizing the air pressure to the test target value, reducing repeated pressure correction operations, and ensuring the reliability of the test data.

[0044] Additionally, it should be noted that in the existing technology, in order to avoid the impact of secondary inflation and static placement on the test progress, a flathead screwdriver can also be used to vent the working chamber of the shock absorber. The specific operation is to insert the flathead screwdriver between the upper lip of the oil seal and the piston rod, and pry the flathead screwdriver outward to open the upper lip of the oil seal. Then, use another, smaller flathead screwdriver to insert into the lower lip of the oil seal to vent the air.

[0045] To ensure a tight seal between the damper oil seal 10 and the piston rod 20, the outer circumferential surface of the piston rod 20 requires a high degree of surface roughness during machining. During the venting process of inserting a flathead screwdriver, scratches can easily occur on the surface of the piston rod 20, damaging the sealing surface and leading to oil and gas leakage during subsequent damper operation, thus affecting the damping function.

[0046] In this embodiment, the insert body 1 is made entirely of rigid plastic (such as PA66, POM, and other engineering plastics), which has a lower hardness than the piston rod 20. Even if it rubs against the surface of the piston rod 20 during insertion, it will not cause surface scratches, thus protecting the sealing effect of the damper. In addition, the rigid plastic insert body 1 has good bending strength and rigidity, and can fully withstand the external force on the force application part 12, ensuring that the insert body 1 will not bend or deform under force, ensuring the accurate insertion of the insertion part 11, and improving the reliability of the venting device.

[0047] Specifically, the thickness of the insertion part 11 gradually increases from bottom to top, and it can be designed as a wedge-shaped thin sheet to facilitate insertion. Small, stable, expanding gaps are sequentially created between the upper lip 102 of the oil seal 10 and the piston rod 20, and between the lower lip 103 and the piston rod 20, allowing gas in the damper's working chamber to slowly escape along these gaps, thus achieving venting. All edges of the insertion part 11 must be rounded (without sharp edges) to prevent excessive wear on the outer peripheral surface of the piston rod 20.

[0048] The force-applying part 12 needs to be designed as a structure that can withstand force, such as a disc or a handle. Testers can apply external force to the force-applying part 12 by manually pressing or by using a simple tool (such as a wrench to assist in pushing). This external force can be evenly transmitted to the insertion part 11, pushing it to insert between the oil seal 10 and the piston rod 20 to form the aforementioned gap.

[0049] In summary, the venting device in this embodiment integrates the insertion part 11 and the force application part 12 onto the insert body 1. It has a simple structure, is easy to operate, and is easy to manufacture, inexpensive, reliable, and has low requirements for the operating environment, making it more adaptable. During operation, venting adjustment can be completed simply by pushing the insertion part 11 between the oil seal 10 and the piston rod 20 through the force application part 12, eliminating the need for specialized equipment on production lines and adapting to diverse usage scenarios in production lines or laboratories.

[0050] For some possible implementations, please refer to [link / reference]. Figure 1 and Figure 3 The insert body 1 also includes a connecting part 13, which is a long strip-shaped component. An insertion part 11 is provided at the lower end of the connecting part 13, and the thickness of the connecting part 13 is not less than the thickness of the upper end of the insertion part 11. A force-applying part 12 is provided at the upper end of the connecting part 13 and has a force-applying plane 121, which is perpendicular to the length direction of the connecting part 13.

[0051] The elongated connecting part 13 serves as an intermediate connecting member between the insertion part 11 and the force-applying part 12, and at the same time bears the role of stably transmitting external force from the force-applying part 12 to the insertion part 11; the thickness of the connecting part 13 is not less than the thickness of the upper end of the insertion part 11, which can provide sufficient rigid support, and transmit the external force on the force-applying part 12 to the insertion part 11 evenly and without loss, ensuring that the insertion part 11 is inserted smoothly and will not cause problems such as bending under force and scraping the oil seal 10 or piston rod 20.

[0052] The force application plane 121 provides a flat and large force-bearing area (which can be a circular or square plane). The force application plane 121 is perpendicular to the length direction of the connecting part 13, which means that the external force applied by the tester will be directly transmitted to the insert part 11 along the length direction of the connecting part 13 (i.e. the insertion direction of the insert part 11) without generating a lateral component force. This further prevents the insert part 11 from tilting to one side due to uneven force, thereby preventing it from scraping the outer peripheral surface of the piston rod 20 or the upper lip 102 and lower lip 103 of the oil seal 10.

[0053] In addition, the elongated design creates a reasonable lever arm distance between the upper force-applying part 12 and the lower insertion part 11, which makes it easier for the test personnel to apply force. Moreover, the venting gap can be formed without applying excessive external force, which helps to reduce hand fatigue of the test personnel during the venting operation.

[0054] Specifically, the force application surface 121 can also be treated with anti-slip measures, such as knurling or adding rubber pads, to prevent the hand from slipping and causing the venting device to fall off when force is applied.

[0055] In some possible embodiments, please refer to Figure 1 , Figure 3 and Figure 4 The insertion part 11 and the connecting part 13 are integrally connected. The insertion part 11 has an inner contact surface 111 and an outer pressure surface 112 that are disposed opposite to each other. The inner contact surface 111 is disposed facing the piston rod 20, and the outer pressure surface 112 gradually slopes towards the inner contact surface 111 from top to bottom. The inner contact surface 111 is flush with the side of the connecting part 13 facing the piston rod 20, and the outer pressure surface 112 is flush with the side of the connecting part 13 away from the piston rod 20.

[0056] The integrated connection design of the insertion part 11 and the connecting part 13 enhances the overall structural rigidity. The outer pressure surface 112 gradually slopes from top to bottom towards the inner contact surface 111, forming a wedge-shaped guide structure, which is adapted to the design of the insertion part 11 having a gradually increasing thickness from bottom to top. During insertion, the inclined surface can guide the insertion part 11 to easily insert between the oil seal 10 and the piston rod 20, reducing insertion resistance.

[0057] The inner surface 111 of the insertion part 11 is flush with the side (inner side) of the connecting part 13 facing the piston rod 20, that is, the two are smoothly connected. When inserted, the inner surface 111 and the inner side of the connecting part 13 can simultaneously fit against the outer peripheral surface of the piston rod 20, which plays a guiding and supporting role for the insertion part 11, while preventing the connecting part from protruding or sinking and scraping the outer peripheral surface of the piston rod 20, thus protecting the sealing structure of the shock absorber.

[0058] The outer pressure surface 112 of the insertion part 11 is flush with the side (outer side) of the connecting part 13 that is away from the piston rod 20. This means that the outer side of the connecting part 13 is also gradually inclined inward from top to bottom, and the inclination angles of the two are the same. This allows the outer pressure surface 112 of the insertion part 11 and the outer side of the connecting part 13 to maintain a smooth transition connection without protrusions. On the one hand, this can prevent the connection position from protruding and damaging the upper lip 102 of the oil seal 10. On the other hand, when it is necessary to increase the exhaust volume, the connecting part 13 can act as an extension of the insertion part 11. By increasing the external force, the connecting part 13 can be further inserted between the oil seal 10 and the piston rod 20, thereby achieving a larger insertion depth and forming a larger venting gap to increase the exhaust volume.

[0059] In addition, the integral connection between the insertion part 11 and the connecting part 13, and the flush arrangement of the inner contact surface 111, the outer pressure surface 112 and the two corresponding side surfaces of the connecting part 13, can realize the integral processing and forming of the insertion part 11 and the connecting part 13, which greatly improves the convenience of processing.

[0060] In some specific embodiments, the inner contact surface 111 is a concave arc surface, which is used to fit against the outer peripheral surface of the piston rod 20; the outer pressure surface 112 is a convex arc surface, which is adapted to the inner peripheral surface of the oil seal 10.

[0061] The concave arc surface increases the contact area between the inner contact surface 111 and the outer peripheral surface of the piston rod 20, which guides the insertion part 11 to move more stably downward along the outer peripheral surface of the piston rod 20, avoiding the deflection of the insertion part 11 and helping to accurately control the venting gap. The convex arc surface is perfectly matched with the inner peripheral surface of the oil seal 10, which can evenly distribute the squeezing force during insertion to the entire contact area of ​​the inner peripheral surface of the oil seal 10, avoiding excessive local stress, thereby protecting the inner peripheral surface of the oil seal 10 from being squeezed and damaged, and ensuring that the oil seal 10 can completely restore its sealing effect after venting.

[0062] Correspondingly, the inner surface of the connecting part 13 can be set as an arc surface with the same curvature as the concave arc surface; the outer surface of the connecting part 13 can also be set as an arc surface with the same curvature as the convex arc surface, so as to facilitate the integral molding of the insert part 11 and the connecting part 13.

[0063] In some embodiments, please refer to Figure 3 and Figure 4 The insertion part 11 has a first side 113 and a second side 114 that are arranged opposite to each other. The first side 113 and the second side 114 are respectively arranged at an angle to the inner surface 111. The first side 113 and the second side 114 are inclined to each other from top to bottom.

[0064] It should be noted that the angle between the first side surface 113 and the second side surface 114 and the inner surface 111 can be a right angle, or an acute or obtuse angle close to a right angle, such as 85°, 88°, 93° or 95°, etc., depending on the specific processing requirements.

[0065] The first side 113 and the second side 114 are inclined towards each other from top to bottom, so that the cross-sectional dimension of the insertion part 11 (perpendicular to the axial direction of the piston rod 20) gradually decreases from top to bottom, eventually forming a wedge-shaped tip that is wide and thick at the top and thin at the bottom. This allows for precise alignment with the interference fit contact surface between the oil seal 10 and the piston rod 20. The test personnel only need to apply a small amount of external force to complete the alignment and insertion of the insertion part 11, which greatly improves the smoothness of operation.

[0066] Furthermore, the connecting part 13 also has two opposing side end faces in the width direction. The first side face 113 and the second side face 114 are respectively flush with the side end faces of the corresponding side of the connecting part 13, so as to facilitate the integral molding of the insertion part 11 and the connecting part 13 and simplify the processing procedure.

[0067] In some embodiments, please refer to Figure 3 and Figure 4 The force-applying part 12 includes a force-applying block 122, which is integrally connected to the upper end of the connecting part 13, and the force-applying plane 121 is the upper surface of the force-applying block 122.

[0068] The integral connection between the force-applying block 122 and the connecting part 13 strengthens the overall structural rigidity, ensuring that the force-applying block 122 and the connecting part 13 always maintain a fixed relative position. This ensures that external force can be accurately transmitted to the insertion part 11 along the length of the connecting part 13, avoiding the risk of misaligned insertion. Even if a large thrust is applied to the force-applying plane 121, the force-applying block 122 and the connecting part 13 will not bend or break, ensuring stable and continuous insertion action and improving the overall service life of the device.

[0069] In this embodiment, the force-applying block 122 is a cuboid component connected to the upper end of the connecting portion 13, located on one side of the piston rod 20. Further details can be found in the following sections. Figure 5 A movable block 123 can be connected to one side of the force-applying block 122, so that the movable block 123 is located on the other side of the piston rod 20. The force-applying plane 121 may include the upper surface of the force-applying block 122 and the upper surface of the movable block 123. When the radial clamping force between the oil seal 10 and the piston rod 20 is large, it is inconvenient for the tester to apply force to the force-applying block 122 with one hand. At this time, the movable block 123 can be selectively connected to the force-applying block 122 so that the tester can apply force from both sides of the piston rod 20 simultaneously with both hands to ensure stable force application.

[0070] Specifically, the movable block 123 is connected to one side of the force-applying block 122 via two connecting rods 124, which are located on opposite sides of the piston rod 20. Each connecting rod 124 has a spring-loaded locking post 125 that engages with the force-applying block 122. When connecting the movable block 123, the connecting rod 124 is inserted into the insertion hole on one side of the force-applying block 122. After insertion, the spring-loaded locking post 125 engages with the locking hole on the upper surface of the force-applying block 122, enabling quick and reliable connection of the movable block 123 and facilitating force application by the test personnel. After venting, the spring-loaded locking post 125 is pressed to disengage from the locking hole on the force-applying block 122, and simultaneously the movable block 123 is pulled outwards to disengage the connecting rod 124 from the insertion hole on the force-applying block 122, completing the quick disassembly of the movable block 123.

[0071] For some specific embodiments, please refer to Figure 3 and Figure 4 The connecting part 13 is also provided with a reinforcing part, which supports the bottom of the force-applying block 122.

[0072] The reinforcing part can evenly distribute the external force borne by the force-applying block 122 to a larger area of ​​the connecting part 13, avoiding stress concentration and fracture at the connection between the connecting part 13 and the force-applying block 122, and significantly improving the rigidity and fatigue resistance of the overall structure. At the same time, the reinforcing part supports the bottom of the force-applying block 122, which can keep the force-applying block 122 in a horizontal position, thereby keeping the force-applying plane 121 in a horizontal state, ensuring that the external force applied to the force-applying block 122 can be effectively transmitted downward to the insertion part 11, which helps to increase the stability of the venting operation.

[0073] Optionally, the reinforcing part can be a block structure or a triangular stiffening plate structure.

[0074] For example, the reinforcing part includes two reinforcing ribs 3, which are respectively connected to the two side end faces of the connecting part 13, and the top of the reinforcing ribs 3 is connected to the bottom of the force-applying block 122.

[0075] The two reinforcing ribs 3 can simultaneously transfer the external force borne by the force-applying block 122 to the connecting part 13 from both sides in the width direction of the connecting part 13, avoiding stress concentration caused by unilateral force application. This significantly improves the bending and fracture resistance of the connection between the force-applying block 122 and the connecting part 13, and extends the overall service life of the venting device. In addition, setting the reinforcing ribs 3 as block structures connected to the side end faces of the connecting part 13 facilitates the integral processing of the two reinforcing ribs 3 and the connecting part 13.

[0076] For some possible implementations, please refer to Figure 2 and Figure 4The insertion part 11 is also provided with an air guide channel. The upper opening of the air guide channel is located above the insertion part 11 and is connected to the outside, which is used to exhaust the gas in the working chamber of the shock absorber.

[0077] The air duct can directly guide the gas in the working chamber of the shock absorber out from the upper opening located above the insertion part 11, avoiding the problem of poor exhaust and unstable speed caused by the air release gap formed by the insertion part 11 being blocked by oil stains, thus ensuring a stable and efficient air release process.

[0078] Optionally, the upper opening of the air guide channel can be located on the connecting part 13 or on the force-applying block 122, as long as the working chamber of the shock absorber can be connected to the outside when the insertion part 11 is inserted between the oil seal 10 and the piston rod 20. The setting of the air guide channel does not change the thin structure of the insertion part 11, and ensures the stability and controllability of the venting process while ensuring that the insertion part 11 can be smoothly inserted to form a venting gap.

[0079] For example, the air guide channel is an air guide groove 2, which is located on the inner surface 111 and extends upward through the force-applying block 122 to form the upper opening of the air guide channel.

[0080] The air guide groove 2 is located on the inner contact surface 111 that fits with the piston rod 20, and extends upward along the integral connection structure of the insertion part 11, the connecting part 13, and the force application block 122. On the one hand, it can directly receive the gas in the working chamber of the shock absorber and discharge it from the upper opening on the force application block 122. The exhaust path is short and will not be blocked or obstructed, ensuring the smooth exhaust path. On the other hand, the recessed design of the air guide groove 2 on the inner contact surface 111 facilitates processing and shaping, and also facilitates observation of the air guide channel's unobstructed state. When dust, oil, or other impurities accumulate in the air guide groove 2, it is easy to clean in a timely manner to ensure the unobstructed air guide channel.

[0081] Specifically, the width of the air guide groove 2 can be 1mm-3mm, depending on the actual dimensions of the insertion part 11, with the main goal of not increasing the overall thickness of the insertion part 11, ensuring that the insertion part 11 can maintain a thin structure so as to smoothly insert between the oil seal 10 and the piston rod 20. The depth of the air guide groove 2 can gradually increase from bottom to top to adapt to the shape of the insertion part 11 and the connecting part 13, while ensuring the exhaust area of ​​the air guide channel.

[0082] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An oil seal venting device for a shock absorber, characterized in that, Includes an insert body (1) having an insertion portion (11) whose thickness gradually increases from bottom to top, so that after being inserted from top to bottom between the oil seal (10) and the piston rod (20) of the shock absorber, a gradually expanding gap is formed between the oil seal (10) and the piston rod (20) to achieve venting; The insert body (1) also has a force-applying part (12), which is connected to the insertion part (11). The force-applying part (12) is used to receive external force to push the insertion part (11) to be inserted between the oil seal (10) and the piston rod (20).

2. The oil seal venting device for a shock absorber as described in claim 1, characterized in that, The insert body (1) further includes a connecting part (13), which is a long strip-shaped component. The insertion part (11) is located at the lower end of the connecting part (13), and the thickness of the connecting part (13) is not less than the thickness of the upper end of the insertion part (11). The force-applying part (12) is located at the upper end of the connecting part (13) and has a force-applying plane (121), which is perpendicular to the length direction of the connecting part (13).

3. The oil seal venting device for a shock absorber as described in claim 2, characterized in that, The insertion part (11) and the connecting part (13) are integrally connected. The insertion part (11) has an inner contact surface (111) and an outer pressure surface (112) that are arranged opposite to each other. The inner contact surface (111) is arranged towards the piston rod (20), and the outer pressure surface (112) gradually slopes towards the inner contact surface (111) from top to bottom. The inner surface (111) is flush with the side of the connecting part (13) facing the piston rod (20), and the outer pressure surface (112) is flush with the side of the connecting part (13) away from the piston rod (20).

4. The oil seal venting device for a shock absorber as described in claim 3, characterized in that, The inner contact surface (111) is a concave arc surface, which is used to fit against the outer peripheral surface of the piston rod (20); the outer pressure surface (112) is a convex arc surface, which is adapted to the inner peripheral surface of the oil seal (10).

5. The oil seal venting device for a shock absorber as described in claim 3, characterized in that, The insertion part (11) has a first side (113) and a second side (114) arranged opposite to each other. The first side (113) and the second side (114) are respectively arranged at an angle to the inner surface (111). The first side (113) and the second side (114) are inclined to each other from top to bottom.

6. The oil seal venting device for a shock absorber as described in claim 3, characterized in that, The force-applying part (12) includes a force-applying block (122), which is integrally connected to the upper end of the connecting part (13), and the force-applying plane (121) is the upper surface of the force-applying block (122).

7. The oil seal venting device for a shock absorber as described in claim 6, characterized in that, The connecting part (13) is also provided with a reinforcing part, which is supported on the bottom of the force-applying block (122).

8. The oil seal venting device for a vibration damper as described in claim 7, characterized in that, The reinforcing part includes two reinforcing ribs (3), which are respectively connected to the two side end faces of the connecting part (13), and the top of the reinforcing ribs (3) is connected to the bottom of the force-applying block (122).

9. The oil seal venting device for a shock absorber as described in claim 6, characterized in that, The insertion part (11) is also provided with an air guide channel. The upper opening of the air guide channel is located above the insertion part (11) and communicates with the outside, and is used to export the gas in the working chamber of the shock absorber.

10. The oil seal venting device for a shock absorber as described in claim 9, characterized in that, The air guiding channel is an air guiding groove (2), which is located on the inner surface (111) and extends upward through the force-applying block (122) to form the upper opening of the air guiding channel.

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