shock absorption device

Abstract

This disclosure discloses a shock-absorbing device, comprising an outer cylinder, an inner cylinder, a tie rod, and a float plug. The outer cylinder has first and second open ends; the inner cylinder has a first end and an open second end, the second end of which can slidably penetrate the outer cylinder and seal against the inner wall of the second open end. The end of the tie rod penetrating the outer cylinder has a radially inwardly facing stop. The tie rod is located inside the outer cylinder and includes a rod portion and a boss. The end of the rod portion away from the boss is sealed to the first open end. The rod portion, the inner cylinder, and the outer cylinder define a first oil chamber for containing hydraulic oil. The boss extends into the inner cylinder and is sealed. When the inner cylinder slides to a preset position, the boss can abut against the stop. The rod portion is a hollow structure with multiple through holes communicating with the first oil chamber. The float plug is slidably sealed inside the inner cylinder, on the side of the boss away from the stop, dividing the interior of the inner cylinder into an air chamber and a second oil chamber communicating with the inner cavity of the tie rod. When the inner cylinder reciprocates, hydraulic oil can flow through the first oil chamber, the inner chamber, and the second oil chamber, and compress the air chamber.

Description

Technical Field

[0001] This disclosure relates to the field of vibration reduction technology, and more specifically, to a vibration reduction device. Background Technology

[0002] Currently, most automobile suspension systems are equipped with shock absorbers to dampen vibrations during driving and ensure a smooth ride. Hydraulic shock absorbers are the most widely used. However, existing shock absorbers have complex structures, are difficult to manufacture, and are prone to detachment, potentially leading to safety accidents.

[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0004] This disclosure provides a shock absorption device with a simple structure, easy processing, and tight fit between components, making it less prone to detachment and providing a high safety factor.

[0005] According to one aspect of this disclosure, a shock-absorbing device is provided, comprising:

[0006] The outer cylinder has a through first open end and a second open end;

[0007] The inner cylinder has a sealed first end and an open second end. The second end is slidably inserted into the outer cylinder and is sealed to the inner wall of the second open end. The end of the inner cylinder that is inserted into the outer cylinder is provided with a stop portion that extends radially inward.

[0008] A pull rod is disposed inside the outer cylinder. The pull rod includes a rod portion and a boss extending radially outward along the rod portion. One end of the rod portion away from the boss is sealed and connected to the first open end. The rod portion, the inner cylinder, and the outer cylinder define a first oil chamber for receiving hydraulic oil. The boss extends into the inner cylinder and is sealed and connected to the inner cylinder. When the inner cylinder slides to a preset position, the boss can abut against the stop portion. The rod portion is a hollow structure and has multiple through holes communicating with the first oil chamber.

[0009] A float plug is slidably and sealingly fitted inside the inner cylinder and located on the side of the boss away from the stop portion. The float plug divides the internal space of the inner cylinder into an air chamber and a second oil chamber that communicates with the inner cavity of the pull rod. When the inner cylinder is slid back and forth, the hydraulic oil can flow in the first oil chamber, the inner cavity and the second oil chamber, and compress the air chamber.

[0010] In one exemplary embodiment of this disclosure, the shock absorption device further includes:

[0011] A steel sleeve is fitted around the outer periphery of the rod and is located between the stop and the boss.

[0012] The anti-collision pad is fitted around the outer periphery of the rod and is located between the steel sleeve and the boss.

[0013] In one exemplary embodiment of this disclosure, the shock absorption device further includes:

[0014] The first sealing element is located inside the first open end and is sealed to the inner wall of the first open end; the first sealing element has a first mounting port that extends through the first sealing element along the axial direction of the outer cylinder.

[0015] The first connector includes a connecting rod and a connector that are connected to each other. The connecting rod passes through the first mounting port and is sealed to the mounting port. The connector abuts against the side of the first sealing member away from the inner cylinder. The end of the rod away from the boss is sleeved on the outer periphery of the end of the connecting rod away from the connector and is connected to the end of the connector.

[0016] In an exemplary embodiment of this disclosure, the outer cylinder includes a first segment and a second segment connected to each other, the second end of the inner cylinder passes through the second segment and is disposed within the first segment, the diameter of the second segment is larger than the diameter of the first segment, and a step is formed between the second segment and the first segment, the interior of the second segment is provided with circumferentially distributed grooves, and an annular receiving groove is defined between the second segment and the outer wall of the inner cylinder; the shock absorption device further includes:

[0017] The second sealing ring is fitted around the outer periphery of the inner cylinder and located in the annular receiving groove, with one end of the second sealing ring abutting against the stepped portion;

[0018] The retaining ring is partially embedded in the annular receiving groove and protrudes from the top surface of the annular receiving groove;

[0019] A stop ring is disposed within the annular receiving groove and located between the retaining ring and the second sealing ring.

[0020] In one exemplary embodiment of this disclosure, there are multiple through holes, and the multiple through holes are evenly distributed on the sidewall of the rod.

[0021] In one exemplary embodiment of this disclosure, the outer peripheral surface of the boss is provided with an annular groove, and the shock absorption device further includes:

[0022] The first sealing ring is disposed within the annular groove.

[0023] In one exemplary embodiment of this disclosure, the float plug has an opening that extends through the float plug in a direction parallel to the axial direction of the inner cylinder; the shock absorption device further includes:

[0024] A second sealing element is disposed inside the opening. The second sealing element is detachably connected to the opening, and when the second sealing element is connected to the opening, it also seals with the opening.

[0025] In one exemplary embodiment of this disclosure, the shock absorption device further includes:

[0026] A dust cover is fitted around the outer circumference of the inner cylinder and blocks the opening of the annular receiving groove.

[0027] In one exemplary embodiment of this disclosure, the shock absorption device further includes:

[0028] An outer tube is located inside the outer cylinder and is sleeved on the outer periphery of the rod. One end of the outer tube is connected to the boss and can rotate relative to the boss, while the other end is connected to the first sealing member. The outer tube is provided with a plurality of damping holes, which are staggered from the through holes in the axial direction of the outer tube.

[0029] In one exemplary embodiment of this disclosure, the first end of the inner cylinder is provided with a third sealing member, which is at least partially inserted into the first end and is sealed to the inner wall of the first end.

[0030] The vibration damping device disclosed herein utilizes the sliding of the inner cylinder within the outer cylinder, combined with the hollow structure of the tie rod and the placement of a float plug. The overall structure is simple, and the components are regularly shaped and easy to manufacture. Furthermore, the tight fit between the components prevents them from detaching, resulting in a high safety factor. This design allows hydraulic oil to flow smoothly between the first oil chamber, the tie rod's inner cavity, and the second oil chamber. The air chamber can compress and reset with vibration, ensuring sufficient stroke to dampen vibration while avoiding excessive enlargement of the outer cylinder, thus reducing the overall volume and meeting the installation requirements in confined spaces.

[0031] During vibration damping, when a heavy object presses down, the inner cylinder moves downward, compressing the first oil chamber. Hydraulic oil in the first oil chamber enters the inner cavity of the tie rod and the second oil chamber through the through-hole, further pushing the float to compress the air chamber. The air chamber is compressed, its volume decreases, and the pressure inside increases after gas compression. When the weight decreases, the inner cylinder rises, and the float inside the inner cylinder, due to the pressure of the gas (i.e., it is elastic, acting as a spring), is forced to move closer to the second oil chamber. At this time, hydraulic oil in the second oil tank and the tie rod cavity flows to the first oil chamber through the through-hole. This process repeats, and the hydraulic oil flows between the various cavities (including the first oil chamber, the inner cavity, and the second oil chamber), generating a stable damping force. During this process, the elastic effect generated by the compression of the air chamber further buffers vibration energy, preventing sudden changes in damping force. Furthermore, the stop and the boss cooperate to limit the sliding range of the inner cylinder, preventing it from falling off and helping to improve the safety factor. In this disclosure, the elastic effect of the gas and the damping effect of the damping orifice work together to achieve a good vibration damping effect.

[0032] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0033] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0034] Figure 1 This is a schematic diagram of a shock-absorbing device in one embodiment of the present disclosure.

[0035] Figure 2 This is a schematic diagram of the outer cylinder in an embodiment of this disclosure.

[0036] Figure 3 This is a schematic diagram of the inner cylinder in an embodiment of this disclosure.

[0037] Figure 4 This is a schematic diagram of the pull rod in an embodiment of this disclosure.

[0038] Figure 5 This is a schematic diagram of the first sealing element in an embodiment of this disclosure.

[0039] Figure 6 This is a schematic diagram of the float in an embodiment of this disclosure.

[0040] Figure 7 This is a schematic diagram of the outer tube in one embodiment of the present disclosure.

[0041] Explanation of reference numerals in the attached figures

[0042] 1. Outer cylinder; 10. Snap ring; 101. First open end; 102. Second open end; 103. First section; 104. Second section; 105. Stepped portion; 106. Snap ring groove; 107. First oil chamber; 11. Stop ring; 12. First sealing ring; 13. Second sealing element; 131. Third rubber ring; 14. Dust cover; 15. Third sealing element; 151. First rubber ring; 152. Second connecting portion; 153. Second connecting hole; 2. Inner cylinder; 201. First end; 202. Second end; 203. Stop ring 3. Tie rod; 301. Rod part; 302. Boss; 303. Inner cavity; 304. Through hole; 305. Annular groove; 4. Float plug; 41. Sealing groove; 42. Second rubber ring; 401. Air cavity; 402. Second oil cavity; 403. Opening; 5. Steel sleeve; 6. Anti-collision pad; 7. First sealing component; 701. First mounting port; 8. First connector; 801. Connecting rod; 802. Connecting head; 803. First connecting part; 804. First connecting hole; 9. Second sealing ring; 20. Outer tube; 2001. Damping hole. Detailed Implementation

[0043] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore detailed descriptions of them will be omitted. Furthermore, the drawings are merely illustrative of this disclosure and are not necessarily drawn to scale.

[0044] Although relative terms such as "up" and "down" are used in this specification to describe the relative relationship of one component of an icon to another, these terms are used only for convenience, such as according to the orientation of the examples shown in the accompanying drawings. It is understood that if the device of the icon is flipped upside down, the component described as "up" will become the component described as "down." When a structure is "up" of another structure, it may mean that the structure is integrally formed on the other structure, or that the structure is "directly" mounted on the other structure, or that the structure is "indirectly" mounted on the other structure through another structure.

[0045] The terms “a,” “one,” “the,” “the,” and “at least one” are used to indicate the presence of one or more elements / components / etc.; the terms “including” and “having” are used to indicate an open-ended inclusion and to mean that there may be other elements / components / etc. in addition to the listed elements / components / etc.; the terms “first,” “second,” and “third,” etc., are used only as markers and are not a limitation on the number of objects.

[0046] This disclosure provides a vibration damping device that can be applied to various scenarios requiring vibration attenuation, such as automotive suspension systems, motorcycle vibration damping systems, bicycle vibration damping components, machine tool vibration damping installations, motor vibration damping, train carriage vibration damping, and marine equipment vibration damping.

[0047] like Figures 1-3 As shown, the shock absorption device includes an outer cylinder 1, an inner cylinder 2, a tie rod 3, and a float 4, wherein:

[0048] The outer cylinder 1 has a through first open end 101 and a second open end 102;

[0049] The inner cylinder 2 has a sealed first end 201 and an open second end 202. The second end 202 is slidably inserted into the outer cylinder 1 and is sealed to the inner wall of the second open end 102. The end of the inner cylinder 2 that is inserted into the outer cylinder 1 is provided with a stop portion 203 that extends radially inward.

[0050] The pull rod 3 is disposed inside the outer cylinder 1. The pull rod 3 includes a rod portion 301 and a boss 302 extending radially outward along the rod portion 301. The end of the rod portion 301 away from the boss 302 is sealed and connected to the first open end 101. The rod portion 301, the inner cylinder 2, and the outer cylinder 1 define a first oil chamber 107 for receiving hydraulic oil. The boss 302 extends into the inner cylinder 2 and is sealed and connected to the inner cylinder 2. When the inner cylinder 2 slides to a preset position, the boss 302 can abut against the stop portion 203. The rod portion 301 is a hollow structure and has multiple through holes 304 communicating with the first oil chamber 107.

[0051] The float plug 4 is slidably sealed inside the inner cylinder 2 and is located on the side of the boss 302 away from the stop part 203. The float plug 4 divides the internal space of the inner cylinder 2 into an air chamber 401 and a second oil chamber 402 that communicates with the inner cavity 303 of the pull rod 3. When the inner cylinder 2 slides back and forth, hydraulic oil can flow in the first oil chamber 107, the inner cavity 303 and the second oil chamber 402, and compress the air chamber 401.

[0052] The shock absorption device disclosed herein utilizes the sliding of the inner cylinder 2 within the outer cylinder 1, combined with the hollow structure of the tie rod 3 and the placement of the float plug 4. The overall structure is simple, and the components are regularly shaped and easy to manufacture. During shock absorption, when a heavy object presses down, the inner cylinder 2 descends, compressing the first oil chamber 107. The hydraulic oil in the first oil chamber 107 enters the inner cavity 303 of the tie rod 3 and the second oil chamber 402 through the through hole 304, thereby pushing the float plug 4 to compress the air chamber 401. The air chamber 401 is compressed, its volume decreases, and the pressure inside the air chamber 401 increases after gas compression. When the weight decreases, the inner cylinder 2 rises, and the float plug 4 within the inner cylinder 2, due to the pressure of the gas (i.e., it is elastic, replacing a spring), is forced to move towards the side closer to the second oil chamber 402. At this time, the hydraulic oil in the second oil chamber and the inner cavity 303 of the tie rod 3 flows to the first oil chamber 107 through the through hole 304. This process repeats, with hydraulic oil flowing between the various chambers (including the first oil chamber 107, the inner chamber 303, and the second oil chamber 402) to generate stable damping force. During this process, the elastic effect generated by the compression of the air chamber 401 further buffers vibration energy and prevents sudden changes in damping force. Furthermore, the stop 203 and the boss 302 cooperate to limit the sliding range of the inner cylinder 2, preventing it from falling off and contributing to a higher safety factor. In this disclosure, the combined effect of gas elasticity and the damping effect of the damping orifice achieves a good vibration reduction effect.

[0053] The following is a detailed description of the components and specific details of the shock absorption device disclosed herein:

[0054] The outer cylinder 1 can serve as an external support structure for the shock absorption device. The outer cylinder 1 has a through first open end 101 and a second open end 102. The material of the outer cylinder 1 can be a metallic material, such as aluminum, carbon steel, alloy steel, etc., to ensure that it has sufficient strength and rigidity to withstand various forces generated during vibration.

[0055] In one exemplary embodiment of this disclosure, please continue to refer to Figure 1 and Figure 2 As shown, the outer cylinder 1 may include a first section 103 and a second section 104 connected to each other. The first section 103 and the second section 104 may be manufactured using an integral molding process, such as welding or forging. The axes of the first section 103 and the second section 104 are collinear, and the diameter of the second section 104 is larger than the diameter of the first section 103, so that a step portion 105 is formed between the second section 104 and the first section 103. The step portion 105 can be used to position and support the subsequently installed second sealing ring 9.

[0056] Please continue reading Figure 2As shown, the second segment 104 has circumferentially distributed slots 106 inside. The cross-sectional shape of the slots 106 can be rectangular, trapezoidal or arc-shaped, etc. The specific dimensions can be designed according to the specifications of the retaining springs 10 subsequently installed in them, so as to ensure that the retaining springs 10 can be stably embedded in the slots 106.

[0057] The inner cylinder 2 serves as a moving part within the shock absorber. The inner cylinder 2 has a sealed first end 201 and an open second end 202. Please continue reading... Figure 1 As shown, the second end 202 of the inner cylinder 2 is slidably inserted into the outer cylinder 1. For example, the second end 202 of the inner cylinder 2 can pass through the second section 104 of the outer cylinder 1 and extend into the first section 103. The second end 202 of the inner cylinder 2 is sealed to the inner wall of the second open end 102 of the outer cylinder 1 to prevent hydraulic oil from leaking from the gap between them. The material of the inner cylinder 2 can also be a metal material, such as stainless steel, aluminum alloy, etc.

[0058] In an exemplary embodiment of this disclosure, after the inner cylinder 2 passes through the second open end 102 of the outer cylinder 1, an annular receiving groove (not shown in the figure) is defined between the second section 104 and the outer wall of the inner cylinder 2. The annular receiving groove is provided with components such as a second sealing ring 9, a snap ring 10 and a stop ring 11 to achieve sealing and limiting between the inner cylinder 2 and the outer cylinder 1.

[0059] For example, the second sealing ring 9 is fitted around the outer periphery of the inner cylinder 2 and located within the annular receiving groove, with one end of the second sealing ring 9 abutting against the stepped portion 105. The material of the second sealing ring 9 can be rubber. The stop ring 11 can also be located within the annular receiving groove and between the retaining spring 10 and the second sealing ring 9. The material of the stop ring 11 can be a metal material, such as carbon steel or stainless steel. The stop ring 11 can be used to position and support the second sealing ring 9, preventing the second sealing ring 9 from shifting or deforming due to the pressure of hydraulic oil during operation. At the same time, it can also evenly transmit the force of the retaining spring 10 to the second sealing ring 9, ensuring that the sealing surfaces between the second sealing ring 9 and the inner cylinder 2 and the outer cylinder 1 always remain tightly fitted.

[0060] The retaining ring 10 can be partially embedded in the annular receiving groove and protrude from the top surface of the annular receiving groove. The retaining ring 10 can be made of stainless steel and has a certain rigidity. The retaining ring 10 can be used to axially limit the stop ring 11 and the second sealing ring 9 to prevent the stop ring 11 and the second sealing ring 9 from falling out of the annular receiving groove, ensuring the stability and reliability of the sealing structure between the inner cylinder 2 and the outer cylinder 1.

[0061] In one exemplary embodiment of this disclosure, the shock-absorbing device further includes a dust cover 14, which is fitted around the outer periphery of the inner cylinder 2 and seals the opening 403 of the annular receiving groove. The dust cover 14 can be made of rubber or plastic material, possessing good flexibility and dustproof performance. The dust cover 14 can prevent external dust, mud, moisture, and other impurities from entering the annular receiving groove, avoiding impurities adhering to components such as the second sealing ring 9, the retaining spring 10, and the stop ring 11, thus affecting the working performance and service life of these components. Simultaneously, it can prevent impurities from entering the sliding mating surface between the inner cylinder 2 and the outer cylinder 1, reducing sliding friction resistance and preventing wear of components.

[0062] In one exemplary embodiment of this disclosure, please continue to refer to Figure 1 and Figure 3 As shown, the end of the inner cylinder 2 that passes through the outer cylinder 1, i.e., the end near the second end 202, is provided with a stop portion 203 extending radially inward. The stop portion 203 can be integrally formed with the inner cylinder 2, such as by turning, or it can be fixed to the inner wall of the inner cylinder 2 by welding or threaded connection. The stop portion 203 can be annular in shape, and its inner diameter should be smaller than the inner diameter of the inner cylinder 2 and larger than the outer diameter of the rod portion 301 of the tie rod 3, so as to ensure that the rod portion 301 of the tie rod 3 can pass smoothly through the stop portion 203. At the same time, when the inner cylinder 2 slides to the preset position, the stop portion 203 can abut against the boss 302 of the tie rod 3, thereby limiting the sliding range of the inner cylinder 2 and preventing the inner cylinder 2 from falling off.

[0063] In one exemplary embodiment of this disclosure, please continue to refer to Figure 1 As shown, the first end 201 of the inner cylinder 2 is provided with a third sealing member 15. The third sealing member 15 is at least partially inserted into the first end 201 of the inner cylinder 2 and is sealed to the inner wall of the first end 201 of the inner cylinder 2 to achieve sealing of the first end 201 of the inner cylinder 2. The third sealing member 15 can be made of metal or high-strength engineering plastic, and its shape can be columnar or disc-shaped. Regarding the connection method with the inner cylinder 2, the third sealing member 15 can be fixed to the first end 201 of the inner cylinder 2 by means of threaded connection, interference fit or welding. At the same time, in order to ensure sealing performance, a first rubber ring 151 is provided between the third sealing member 15 and the inner wall of the inner cylinder 2. The first rubber ring 151 can be embedded in the third sealing member 15 and can surround the outer circumference of the third sealing member 15. The top surface of the first rubber ring 151 contacts the inner circumferential surface of the first end 201 of the inner cylinder 2 to seal the third sealing member 15 and the first end 201 of the inner cylinder 2, thereby preventing gas leakage in the gas chamber 401.

[0064] In one exemplary embodiment of this disclosure, the third sealing member 15 further includes a second connecting portion 152, on which a second connecting hole 153 is provided, through which the shock-absorbing device can be adapted and connected to other components.

[0065] like Figure 1 and Figure 4 As shown, the tie rod 3 is disposed inside the outer cylinder 1. The tie rod 3 includes a rod portion 301 and a boss 302 extending radially outward along the rod portion 301. The rod portion 301 and the boss 302 can be integrally formed, such as by forging or machining, to ensure the connection strength and coaxiality between the two. The rod portion 301 is a hollow structure, and an inner cavity 303 is formed inside it.

[0066] In an exemplary embodiment of this disclosure, the rod portion 301, the inner cylinder 2, and the outer cylinder 1 define a first oil chamber 107 for receiving hydraulic oil. The rod portion 301 is provided with a plurality of through holes 304 communicating with the first oil chamber 107. These through holes 304 are evenly distributed on the sidewall of the rod portion 301. This design allows for a more uniform and smooth flow of hydraulic oil from the first oil chamber 107 into the inner chamber 303 or from the inner chamber 303 into the first oil chamber 107, preventing unstable damping force due to excessively fast or slow local hydraulic oil flow rates. The diameter of the through holes 304 can be adjusted according to the damping coefficient required by the shock absorber. If a larger damping force is required, the diameter of the through holes 304 can be appropriately reduced; if a smaller damping force is required, the diameter of the through holes 304 can be appropriately increased.

[0067] In one exemplary embodiment of this disclosure, please continue to refer to Figure 1 As shown, the boss 302 can extend into the inner cylinder 2 and is sealed to the inner wall of the inner cylinder 2 to prevent hydraulic oil in the first oil chamber 107 from leaking through the contact interface between the inner cylinder 2 and the boss 302. Figure 1 and Figure 4 As shown, the outer circumferential surface of the boss 302 is provided with an annular groove 305, and a first sealing ring 12 is provided in the annular groove 305. The first sealing ring 12 can be made of oil-resistant rubber material, such as nitrile rubber, fluororubber, etc. When the boss 302 is installed in the inner cylinder 2, the first sealing ring 12 can fit tightly with the inner wall of the inner cylinder 2 to form an effective sealing surface, preventing hydraulic oil from leaking from the gap between the boss 302 and the inner cylinder 2.

[0068] In one exemplary embodiment of this disclosure, the boss 302, in addition to its sealing function, can also cooperate with the stop portion 203 of the inner cylinder 2 to limit the sliding range of the inner cylinder 2. When the inner cylinder 2 slides to a preset position inside the outer cylinder 1, the stop portion 203 can abut against the boss 302, thereby preventing the inner cylinder 2 from continuing to slide away from the pull rod 3, thus preventing the inner cylinder 2 from falling off.

[0069] In one exemplary embodiment of this disclosure, the end of the rod 301 away from the boss 302 is sealed to the first open end 101 of the outer cylinder 1. Please continue to see Figure 1 As shown, the shock absorption device also includes a first sealing element 7 and a first connector 8. The first sealing element 7 is located inside the first open end 101 of the outer cylinder 1 and is sealed to the inner wall of the first open end 101. The first sealing element 7 can be made of metal or high-strength engineering plastic, and its shape matches the internal shape of the first open end 101 of the outer cylinder 1. For example, the cross-section of the portion of the first sealing element 7 that extends into the first open end 101 can be cylindrical. The first sealing element 7 can be fixed to the inner wall of the outer cylinder 1 by interference fit, threaded connection, or welding.

[0070] In one exemplary embodiment of this disclosure, such as Figure 5 As shown, the first sealing member 7 has a first mounting port 701 extending axially through the outer cylinder 1, for mounting the first connector 8. The first connector 8 includes a connecting rod 801 and a connector 802 connected to each other, which can be an integral structure. The connecting rod 801 passes through the first mounting port 701 and is sealed to it. The connector 802 abuts against the side of the first sealing member 7 away from the inner cylinder 2 to axially position the first connector 8. A second sealing ring 702 can be provided between the connecting rod 801 and the first mounting port 701 to ensure sealing performance and prevent hydraulic oil leakage.

[0071] In one exemplary embodiment of this disclosure, the first connector 8 further includes a first connecting portion 803, which is connected to the connector 802. The first connecting portion 803 is provided with a first connecting hole 804, through which the shock-absorbing device can be adapted and connected to other components.

[0072] In one exemplary embodiment of this disclosure, the end of the rod 301 away from the boss 302 is sleeved on the outer periphery of the end of the connecting rod 801 away from the connector 802, and is connected to the end of the connector 802. For example, it can be connected by means of threaded connection, pin connection or snap-fit ​​connection. In this example embodiment, a threaded connection is preferred, that is, the inner wall of the end of the rod 301 is provided with internal thread, and the outer wall of the end of the connecting rod 801 is provided with external thread. The rod 301 and the connecting rod 801 are detachably connected by threaded engagement.

[0073] Please continue reading Figure 1As shown, the float plug 4 is slidably and sealingly fitted inside the inner cylinder 2, and is located on the side of the boss 302 away from the stop portion 203. The float plug 4 divides the internal space of the inner cylinder 2 into an air chamber 401 and a second oil chamber 402, wherein the air chamber 401 is located on the side of the float plug 4 away from the boss 302, and the second oil chamber 402 is located on the side of the float plug 4 closer to the boss 302, and the second oil chamber 402 is connected to the inner cavity 303 of the pull rod 3. The float plug 4 can be made of metal or high-strength engineering plastic, and its outer peripheral surface can be precision machined to ensure good surface accuracy and cylindricity, so as to ensure that the float plug 4 can slide smoothly inside the inner cylinder 2, while maintaining good sealing performance with the inner wall of the inner cylinder 2.

[0074] In one exemplary embodiment of this disclosure, such as Figure 6 As shown, the outer circumferential surface of the float plug 4 is provided with a sealing groove 41, and the sealing groove 41 is provided with a second rubber ring 42. When the float plug 4 slides in the inner cylinder 2, the second rubber ring 42 can fit tightly against the inner wall of the inner cylinder 2, preventing the gas in the air chamber 401 from entering the second oil chamber 402, and also preventing the hydraulic oil in the second oil chamber 402 from entering the air chamber 401, ensuring the independence of the air chamber 401 and the second oil chamber 402.

[0075] In one exemplary embodiment of this disclosure, the float 4 is provided with an opening 403, which extends through the float 4 in a direction parallel to the axial direction of the inner cylinder 2. During the assembly of the shock absorber, hydraulic oil can be filled into the first oil chamber 107 and / or the inner cavity 303 through the opening 403, and the pressure of the hydraulic oil can be adjusted or released when needed.

[0076] Please continue reading Figure 1 As shown, the shock absorption device also includes a second sealing element 13, which is disposed within the opening 403 and is detachably connected to the opening 403. The material of the second sealing element 13 can be metal or high-strength engineering plastic, and its shape matches the shape of the opening 403; for example, it can be cylindrical or conical. The detachable connection between the second sealing element 13 and the opening 403 can be a threaded connection, an interference fit, or a snap-fit ​​connection, etc.

[0077] In one exemplary embodiment of this disclosure, when the second sealing member 13 is connected to the opening 403, it provides a sealing fit with the opening 403. For example, a third rubber ring 131 is provided between the second sealing member 13 and the side wall of the opening. The third rubber ring 131 can prevent gas in the air chamber 401 from leaking through the gap between the second sealing member 13 and the opening 403, and can also prevent hydraulic oil in the second oil chamber 402 from leaking through the gap between the second sealing member 13 and the opening 403.

[0078] During the vibration damping process, when the inner cylinder 2 reciprocates within the outer cylinder 1, it causes the float 4 within the inner cylinder 2 to move along with it. Simultaneously, hydraulic oil flows through the first oil chamber 107, the inner cavity 303 of the tie rod 3, and the second oil chamber 402. Specifically, when the inner cylinder 2 slides towards the first open end 101, it compresses the volume of the first oil chamber 107, causing the hydraulic oil within it to be pressurized. This pressure then flows through the through hole 304 on the rod 301 into the inner cavity 303 of the tie rod 3, and then from the inner cavity 303 into the second oil chamber 402. As the volume of hydraulic oil in the second oil chamber 402 increases, it pushes the float 4 away from the boss 302, thereby compressing the gas in the air chamber 401. The gas pressure in the air chamber 401 increases accordingly, generating elastic force and buffering the vibration.

[0079] When the inner cylinder 2 slides away from the first open end 101, the volume of the first oil chamber 107 increases, creating a negative pressure. At this time, the compressed gas in the air chamber 401, due to its elastic force, pushes the float 4 towards the boss 302, thereby squeezing the hydraulic oil in the second oil chamber 402 into the inner cavity 303 of the pull rod 3, and then flowing back from the inner cavity 303 through the through hole 304 to the first oil chamber 107, completing the circulation of the hydraulic oil. During the circulation of the hydraulic oil, the friction between the hydraulic oil and the walls of the channels such as the through hole 304 and the inner cavity 303, as well as the internal friction between the hydraulic oil molecules, will generate damping force. The damping force, together with the elastic force of the air chamber 401, can effectively dampen vibration and ensure the stable operation of the shock absorption device.

[0080] In one exemplary embodiment of this disclosure, please continue to refer to Figure 1 As shown, the shock absorption device also includes a steel sleeve 5 and a crash pad 6. Both the steel sleeve 5 and the crash pad 6 are fitted around the outer periphery of the rod portion 301 of the tie rod 3. The steel sleeve 5 is located between the stop portion 203 and the crash pad 6, and the crash pad 6 is located between the steel sleeve 5 and the boss 302. The steel sleeve 5 can be made of metal, such as carbon steel or stainless steel. The steel sleeve 5 can enhance the contact strength between the stop portion 203 and the crash pad 6, preventing the stop portion 203 from deforming or being damaged due to excessive local pressure when in contact with the crash pad 6. At the same time, it can also provide a certain positioning and support for the crash pad 6.

[0081] The anti-collision pad 6 can be made of rubber, which has good elasticity and cushioning properties. When the stop 203 and the boss 302 are about to collide, it can absorb the collision energy through its own elastic deformation, reducing the impact and preventing direct rigid collisions between metal parts. This reduces noise generation, protects the components of the shock absorber, and extends the service life of the shock absorber. The anti-collision pad 6 can be cylindrical or annular, with its inner diameter matching the outer diameter of the rod 301 to ensure that the anti-collision pad 6 can be tightly fitted onto the rod 301, preventing displacement during operation. The thickness and hardness of the anti-collision pad 6 can be adjusted according to the working pressure and impact force of the shock absorber to achieve the best cushioning effect.

[0082] In one exemplary embodiment of this disclosure, such as Figure 7 As shown, the shock-absorbing device of this disclosure may further include an outer tube 20, which is located inside the outer cylinder 1 and sleeved on the outer periphery of the rod portion 301; one end of the outer tube 20 is connected to the boss 302 and can rotate relative to the boss 302, and the other end is connected to the first sealing member 7; the outer tube 20 is provided with a plurality of damping holes 2001, and the damping holes 2001 and the through holes 304 are staggered in the axial direction of the outer tube 20. It should be noted that when the shock-absorbing device further includes the outer tube 20, the inner cylinder 2 may be sleeved on the outer periphery of the end of the outer tube 20 near the second open end 102. The steel sleeve 5 and the anti-collision pad 6 may also be sleeved on the outer periphery of the outer tube 20. The outer tube 20 may be integrally formed with the first sealing member 7; or, one end of the outer tube 20 may be embedded in the first sealing member 7.

[0083] In one exemplary embodiment of this disclosure, the outer tube 20 can rotate relative to the rod 301, thereby adjusting the distance between the damping hole 2001 and the through hole 304 to achieve the effect of adjusting the damping level. For example, the first connector 8 can be fixed, and the first sealing member 7 can be rotated, thereby causing the outer tube 20 to rotate relative to the pull rod 3. Alternatively, the first sealing member 7 can be fixed, and the first connector 8 can be turned clockwise, thereby causing the pull rod 3 to rotate relative to the outer tube 20 through the first connector 8.

[0084] The working principle of the shock absorption device disclosed herein is explained below:

[0085] When the first end 201 of the inner cylinder 2 is subjected to force, the inner cylinder 2 slides towards the first open end 101 of the outer cylinder 1. The sliding of the inner cylinder 2 compresses the volume of the first oil chamber 107, increasing the hydraulic oil pressure in the first oil chamber 107. The hydraulic oil flows into the inner cavity 303 of the tie rod 3 through the through hole 304 on the rod 301, and then flows into the second oil chamber 402 from the inner cavity 303. As the amount of hydraulic oil in the second oil chamber 402 increases, the hydraulic oil pushes the float 4 to slide away from the boss 302, compressing the gas in the air chamber 401. The gas pressure in the air chamber 401 increases, generating elastic force. At the same time, the friction between the hydraulic oil and the channel wall during the flow process, as well as the internal friction between the hydraulic oil molecules, generates damping force. The combined action of the elastic force and the damping force hinders the upward sliding of the inner cylinder 2, thereby reducing the transmission of vibration to the vehicle body and keeping the vehicle body relatively stable.

[0086] When the force acting on the first end 201 of the inner cylinder 2 disappears, the gas pressure in the inner cylinder 2 causes it to slide away from the first open end 101 of the outer cylinder 1. At this time, the volume of the first oil chamber 107 increases, creating a negative pressure. The compressed gas in the gas chamber 401, due to its elastic force, pushes the float 4 towards the boss 302, squeezing the hydraulic oil in the second oil chamber 402 into the inner cavity 303 of the tie rod 3, and then flowing back from the inner cavity 303 through the through hole 304 to the first oil chamber 107. During the hydraulic oil return process, a damping force is also generated, hindering the downward sliding of the inner cylinder 2, further damping the vibration, and allowing the vehicle body to smoothly return to its normal position.

[0087] Throughout the entire shock absorption process, the cooperation between the stop 203 and the boss 302 can limit the maximum sliding stroke of the inner cylinder 2, preventing the inner cylinder 2 from sliding excessively and colliding with other components; the steel sleeve 5 and the anti-collision pad 6 can reduce the impact and noise when the stop 203 and the boss 302 are about to contact; each sealing ring and sealing component can ensure the sealing performance of the shock absorption device, prevent hydraulic oil leakage and air leakage in the air chamber 401, and ensure that the shock absorption device can work stably and reliably.

[0088] It should be noted that when the shock absorption device also includes an outer tube 20, when the first end 201 of the inner cylinder 2 is subjected to force, the hydraulic oil between the outer tube 20 and the outer cylinder 1 can enter the gap between the outer tube 20 and the rod 301 through the damping hole 2001, forming damping through this gap. The hydraulic oil in the gap between the outer tube 20 and the rod 301 can enter the inner cavity 303 of the tie rod 3 through the through hole 304, thus forming secondary damping. That is, in this process, two damping processes can be formed through the setting of the damping hole 2001 and the through hole 304, resulting in better damping effect.

[0089] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the utility models disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

Claims

1. A shock absorption device, characterized in that, include: The outer cylinder has a through first open end and a second open end; The inner cylinder has a sealed first end and an open second end. The second end is slidably inserted into the outer cylinder and is sealed to the inner wall of the second open end. The end of the inner cylinder that is inserted into the outer cylinder is provided with a stop portion that extends radially inward. A pull rod is disposed inside the outer cylinder. The pull rod includes a rod portion and a boss extending radially outward along the rod portion. One end of the rod portion away from the boss is sealed and connected to the first open end. The rod portion, the inner cylinder, and the outer cylinder define a first oil chamber for receiving hydraulic oil. The boss extends into the inner cylinder and is sealed and connected to the inner cylinder. When the inner cylinder slides to a preset position, the boss can abut against the stop portion. The rod portion is a hollow structure and has multiple through holes communicating with the first oil chamber. A float plug is slidably and sealingly fitted inside the inner cylinder and located on the side of the boss away from the stop portion. The float plug divides the internal space of the inner cylinder into an air chamber and a second oil chamber that communicates with the inner cavity of the pull rod. When the inner cylinder is slid back and forth, the hydraulic oil can flow in the first oil chamber, the inner cavity and the second oil chamber, and compress the air chamber.

2. The shock absorption device according to claim 1, characterized in that, The shock absorption device also includes: A steel sleeve is fitted around the outer periphery of the rod and is located between the stop and the boss. The anti-collision pad is fitted around the outer periphery of the rod and is located between the steel sleeve and the boss.

3. The shock absorption device according to claim 1, characterized in that, The shock absorption device also includes: The first sealing element is located inside the first open end and is sealed to the inner wall of the first open end; the first sealing element has a first mounting port that extends through the first sealing element along the axial direction of the outer cylinder. The first connector includes a connecting rod and a connector that are connected to each other. The connecting rod passes through the first mounting port and is sealed to the mounting port. The connector abuts against the side of the first sealing member away from the inner cylinder. The end of the rod away from the boss is sleeved on the outer periphery of the end of the connecting rod away from the connector and is connected to the end of the connector.

4. The shock absorption device according to claim 1, characterized in that, The outer cylinder includes a first section and a second section connected to each other. The second end of the inner cylinder passes through the second section and is inserted into the first section. The diameter of the second section is larger than the diameter of the first section, and a step is formed between the second section and the first section. The interior of the second section has circumferentially distributed grooves. An annular receiving groove is defined between the second section and the outer wall of the inner cylinder. The shock absorption device further includes: The second sealing ring is fitted around the outer periphery of the inner cylinder and located in the annular receiving groove, with one end of the second sealing ring abutting against the stepped portion; The retaining ring is partially embedded in the annular receiving groove and protrudes from the top surface of the annular receiving groove; A stop ring is disposed within the annular receiving groove and located between the retaining ring and the second sealing ring.

5. The shock absorption device according to claim 1, characterized in that, The number of through holes is multiple, and the multiple through holes are evenly distributed on the sidewall of the rod.

6. The shock absorption device according to claim 1, characterized in that, The outer circumferential surface of the boss is provided with an annular groove, and the shock absorption device further includes: The first sealing ring is disposed within the annular groove.

7. The shock absorption device according to claim 1, characterized in that, The float plug has an opening that extends through it in a direction parallel to the axial direction of the inner cylinder; the shock absorption device further includes: A second sealing element is disposed inside the opening. The second sealing element is detachably connected to the opening, and when the second sealing element is connected to the opening, it also seals with the opening.

8. The shock absorption device according to claim 4, characterized in that, The shock absorption device also includes: A dust cover is fitted around the outer circumference of the inner cylinder and blocks the opening of the annular receiving groove.

9. The shock absorption device according to claim 3, characterized in that, The shock absorption device also includes: An outer tube is located inside the outer cylinder and is sleeved on the outer periphery of the rod. One end of the outer tube is connected to the boss and can rotate relative to the boss, while the other end is connected to the first sealing member. The outer tube is provided with a plurality of damping holes, which are staggered from the through holes in the axial direction of the outer tube.

10. The shock absorption device according to any one of claims 1-9, characterized in that, The first end of the inner cylinder is provided with a third sealing member, which is at least partially inserted into the first end and is sealed to the inner wall of the first end.

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