Shock absorber

Abstract

The utility model belongs to the technical field of shock absorbers, and particularly relates to a shock absorber. The cylinder body assembly comprises an outer cylinder and an inner cylinder which is sleeved in the outer cylinder in a manner of being incapable of moving relatively, the outer cylinder defines an axial direction and comprises a first end and a second end, a first cavity is defined between the outer cylinder and the inner cylinder, and a second cavity is defined by the inner cylinder; the movable rod assembly penetrates through the cylinder body assembly and can move between a first position and a second position in the axial direction, the movable rod assembly comprises a first rod piece and a second rod piece, the second rod piece can be synchronously and movably connected to the first rod piece in the axial direction, the first rod piece protrudes out of the first end, and the second rod piece protrudes out of the second end. The second rod piece protrudes out of the second end; the first buffering unit comprises a pushing and abutting piece and at least one first communication channel, the pushing and abutting piece is arranged on the first rod piece and located in the first cavity, and the at least one first communication channel is communicated with the first cavity and the second cavity. The buffering device is long in buffering stroke and good in supporting effect.

Description

Technical Field

[0001] The utility model belongs to the technical field of shock absorbers, and particularly relates to a shock absorber. Background Art

[0002] A shock absorber is an essential device for a vehicle body, mainly used to absorb the continuous up-and-down vibrations generated by the vehicle body as it bumps on the road surface during travel, so that the rider has a more comfortable riding experience. When in operation, the shock absorber converts the impact force between the vehicle body and the road surface into heat energy and consumes it through the resistance generated when the internal fluid flows through components such as a pushing member and damping holes, thereby achieving the purpose of buffering and shock absorption.

[0003] However, in existing shock absorbers, one end of the damping cylinder and one end of the pushing member are respectively fixed to the vehicle body, resulting in a short stroke of the pushing member, insufficient buffering effect, and poor supporting strength of the shock absorber, unable to provide the expected buffering effect, and there are deficiencies that need to be improved urgently.

[0004] Therefore, it is necessary to provide a novel and progressive shock absorber to solve the above problems. Summary of the Utility Model

[0005] To solve the defects and deficiencies of the prior art; the purpose of the utility model is to provide a shock absorber for a vehicle body with a simple structure, reasonable design and convenient use, having a long buffering stroke and good supporting effect.

[0006] To achieve the above object, the utility model provides a shock absorber, including: a cylinder assembly, a movable rod assembly and a first buffer unit. The cylinder assembly is provided on a vehicle body in a non-relatively movable manner. The cylinder assembly includes an outer cylinder and an inner cylinder that is non-relatively movably sleeved inside the outer cylinder. The outer cylinder defines an axial direction and includes a first end and a second end. A first chamber is formed between the outer cylinder and the inner cylinder, and the inner cylinder defines a second chamber. The first chamber and the second chamber are used to store a fluid. The movable rod assembly passes through the cylinder assembly and can move relative to the cylinder assembly along the axial direction between a first position and a second position. The movable rod assembly includes a first rod and a second rod. The second rod is connected to the first rod in a synchronously movable manner along the axial direction. The first rod protrudes from the first end, and the second rod protrudes from the second end. The first buffer unit includes a pushing member and at least one first connecting channel. The pushing member is provided on the first rod and is located in the first chamber. The at least one first connecting channel connects the first chamber and the second chamber. Wherein, when the movable rod assembly moves from the first position towards the second position, the movable rod assembly moves towards the side provided with the second end. The first rod drives the pushing member to move along the axial direction, and the pushing member pushes the fluid to flow from the first chamber to the second chamber through the at least one first connecting channel. Description of the Drawings

[0007] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be described in detail by the following specific embodiments and the accompanying drawings.

[0008] Figure 1 It is a perspective view of an embodiment of the present invention.

[0009] Figure 2 It is an exploded view of an embodiment of the present invention.

[0010] Figure 3 It is a sectional view of an embodiment of the present invention.

[0011] Figure 4 It is an operation schematic diagram when the embodiment of the present invention moves to a second position.

[0012] Figure 5 For Figure 4 the partial enlarged view in

[0013] Figure 6 It is an operation schematic diagram when the embodiment of the present invention moves to a first position.

[0014] Figure 7 For Figure 6 the partial enlarged view in

[0015] Explanation of reference numerals: 1: shock absorber, 10: cylinder block assembly, 11: outer cylinder, 111: first end, 112: second end, 113: first chamber, 114: first cover, 115: second cover, 12: inner cylinder, 121: second chamber, 13: positioning ring, 14: second washer, 15: third elastic member, 20: movable rod assembly, 21: first rod, 211: third connecting channel, 22: second rod, 221: fourth connecting channel, 23: connecting member, 231: second connecting channel, 30: first buffer unit, 31: pushing member, 32: first connecting channel, 33: buffer member, 331: fifth chamber, 332: perforation, 34: first washer, 35: second elastic member, 40: second buffer unit, 41: valve assembly, 411: valve body, 411a: first side portion, 411b: second side portion, 412: first shielding assembly, 413: second shielding assembly, 414: compression flow channel, 415: rebound flow channel, 416: elastic abutting member, 417: valve plate, 418: diaphragm, 42: third chamber, 43: fourth chamber, 50: damping adjustment mechanism, 51: adjusting rod needle, 52: adjusting port, 53: sleeve, 54: first elastic member. Detailed Description of the Embodiment

[0016] To make the objectives, technical solutions and advantages of the present utility model clearer and more explicit, the present utility model will be described below through specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present utility model. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessarily confusing the concept of the present utility model.

[0017] Here, it should also be noted that in order to avoid obscuring the present utility model with unnecessary details, only the structures and / or processing steps closely related to the solution according to the present utility model are shown in the drawings, while other details less relevant to the present utility model are omitted.

[0018] Referring to Figure 1 As shown, the following technical solution is adopted in this specific embodiment: The shock absorber 1 of the present utility model includes a cylinder block assembly 10, a movable rod assembly 20 and a first buffer unit 30.

[0019] The cylinder block assembly 10 is provided on a vehicle body in a non-relative moving manner. The cylinder block assembly 10 includes an outer cylinder 11 and an inner cylinder 12 that is non-relative movable and sleeved inside the outer cylinder 11. The outer cylinder 11 defines an axial direction and includes a first end 111 and a second end 112. A first chamber 113 is defined between the outer cylinder 11 and the inner cylinder 12. The inner cylinder 12 defines a second chamber 121. The first chamber 113 and the second chamber 121 are for storing a fluid. The movable rod assembly 20 passes through the cylinder block assembly 10 and can move relative to the cylinder block assembly 10 along the axial direction between a first position and a second position. The movable rod assembly 20 includes a first rod 21 and a second rod 22. The second rod 22 is connected to the first rod 21 in a synchronously movable manner along the axial direction. The first rod 21 protrudes from the first end 111, and the second rod 22 protrudes from the second end 112. The first buffer unit 30 includes a pushing member 31 and at least one first connecting channel 32. The pushing member 31 is provided on the first rod 21 and is located in the first chamber 113. The at least one first connecting channel 32 connects the first chamber 113 and the second chamber 121.

[0020] When the movable rod assembly 20 moves from the first position towards the second position, the movable rod assembly 20 moves towards the side where the second end 112 is provided. The first rod 21 drives the pushing member 31 to move along the axial direction. The pushing member 31 pushes the fluid to flow from the first chamber 113 to the second chamber 121 through the at least one first connecting channel 32, as Figure 4As shown; conversely, when the movable rod assembly 20 moves from the second position towards the first position, the movable rod assembly 20 moves towards the side provided with the first end 111, and the first rod 21 drives the pushing member 31 to move along the axial direction, so that the fluid flows from the second chamber 121 to the first chamber 113 through the at least one first connecting channel 32, as Figure 6 shown. Thereby, a damping effect can be generated among the pushing member 31, the first chamber 113, the second chamber 121 and the at least one first connecting channel 32 when the movable rod assembly 20 moves, achieving the purposes of buffering and shock absorption. For example, the vehicle body can be a single-wheeled electric vehicle, the cylinder block assembly 10 can be arranged on a body of the single-wheeled electric vehicle, and the second rod 22 can be connected to a footrest of the unicycle, and the footrest can move relative to the body. By the configuration that the movable rod assembly 20 penetrates through the cylinder block assembly 10, the buffering stroke of the shock absorber 1 can be increased, and the supporting effect is good.

[0021] The inner cylinder 12 is entirely located inside the outer cylinder 11 and is coaxially arranged with the outer cylinder 11; in the axial direction, a length of the second chamber 121 is less than a length of the first chamber 113 and is at least 1 / 2 of the length of the first chamber 113, which can reduce the overall volume of the shock absorber 1 and also helps to provide a damping effect. In this embodiment, the inner cylinder 12 is located on the side of the outer cylinder 11 close to the second end 112, and the at least one first connecting channel 32 is located on the side of the inner cylinder 12 close to the second end 112, increasing the movable stroke of the pushing member 31 and the flow stroke of the fluid in the first chamber 113, and the buffering effect is better. There is a gap between the pushing member 31 and an inner peripheral wall of the outer cylinder 11 to allow the fluid to move towards the side of the first chamber 113 relatively close to the first end 111 at a relatively slow speed, with a simple structure and convenient assembly. In other embodiments, the pushing member can also be fluid-sealedly connected to the inner peripheral wall of the outer cylinder in the circumferential direction, and a plurality of communication holes are additionally provided to allow the fluid to flow through both sides thereof, and the same effect can also be achieved.

[0022] Preferably, the first buffer unit 30 further includes a buffer member 33 disposed between the outer cylinder 11 and the inner cylinder 12. A fifth chamber 331 is defined between the buffer member 33 and an outer peripheral surface of the inner cylinder 12. The buffer member 33 is provided with a plurality of through holes 332 communicating the first chamber 113 and the fifth chamber 331. The at least one first connecting channel 32 penetrates through the inner cylinder 12 and communicates the second chamber 121 and the fifth chamber 331, so as to increase the flow resistance of the fluid. In this embodiment, the plurality of through holes 332 and the at least one first connecting channel 32 are offset in a radial direction of the inner cylinder 12. The number of the plurality of through holes 332 is greater than the number of the at least one first connecting channel 32. The aperture of each through hole 332 is greater than the aperture of each first connecting channel 32, effectively increasing the flow path of the fluid and increasing the flow resistance of the fluid between the first chamber 113 and the second chamber 121.

[0023] With reference to Figure 3 , the buffer member 33 is located on a side of the inner cylinder 12 close to the second end 112. The first buffer unit 30 further includes a first washer 34 and a second elastic member 35. The first washer 34 is clamped between a side of the buffer member 33 away from the second end 112 and the inner cylinder 12. The second elastic member 35 elastically abuts between the pushing member 31 and the first washer 34. The first washer 34 ensures that the fluid can only enter the fifth chamber 331 through the plurality of through holes 332. The second elastic member 35 can support the weight of the pedal and its related components. The outer cylinder 11 further includes a first cover 114 and a second cover 115. The first cover 114 and the second cover 115 are respectively fluid-sealedly covered on the first end 111 and the second end 112. The inner cylinder 12 is screwed to the buffer member 33, and the buffer member 33 is screwed to the second cover 115, which is convenient for assembly and maintenance and has good connection strength.

[0024] The shock absorber 1 further includes a second buffer unit 40. The second buffer unit 40 includes a valve assembly 41 that is non-relatively movably disposed on the movable rod assembly 20. The valve assembly 41 is located in the second chamber 121 and divides the second chamber 121 into a third chamber 42 and a fourth chamber 43. The movable rod assembly 20 further includes a connecting member 23 connected between the first rod member 21 and the second rod member 22. The connecting member 23 is provided with a second connecting passage 231 therethrough. Two ports of the second connecting passage 231 communicate with the third chamber 42 and the fourth chamber 43 respectively. In this embodiment, one end of the first rod member 21 connected to the connecting member 23 is provided with a third connecting passage 211. The third connecting passage 211 axially communicates with the second connecting passage 231 and radially communicates with the third chamber 42. One end of the second rod member 22 connected to the connecting member 23 is provided with a fourth connecting passage 221. The fourth connecting passage 221 axially communicates with the second connecting passage 231 and radially communicates with the fourth chamber 43. The structure is simple and convenient for processing. The valve assembly 41 is sleeved on the connecting member 23. The connecting member 23 is respectively screwed to the first rod member 21 and the second rod member 22, which is convenient for assembly.

[0025] The cylinder block assembly 10 further includes a positioning ring 13, a second washer 14 and a third elastic member 15. The positioning ring 13 is screwed to one end of the inner cylinder 12 facing the pushing member 31. The second washer 14 and the third elastic member 15 are located between the positioning ring 13 and the connecting member 23. The second washer 14 is sleeved between the first rod member 21 and the inner cylinder 12 and the first rod member 21 can drive the second washer 14 to move along the axial direction. The third elastic member 15 abuts between the second washer 14 and the connecting member 23. A gap is maintained between the second washer 14 and an inner peripheral surface of the inner cylinder 12, allowing the fluid to flow through and providing fluid resistance. The third elastic member 15 can push the second washer 14 to reset when the movable rod assembly 20 moves towards the first position.

[0026] The valve assembly 41 includes a valve body 411, a first shielding assembly 412 and a second shielding assembly 413. The valve body 411 includes a first side portion 411a facing the third chamber 42, a second side portion 411b facing the fourth chamber 43, and a plurality of compression flow channels 414 and a plurality of rebound flow channels 415 axially penetrating between the first side portion 411a and the second side portion 411b. The plurality of compression flow channels 414 and the plurality of rebound flow channels 415 are alternately arranged along the circumferential direction of the valve body 411 and are not connected to each other. The first shielding assembly 412 is disposed on the first side portion 411a and only shields the plurality of compression flow channels 414 without shielding the plurality of rebound flow channels 415. The second shielding assembly 413 is disposed on the second side portion 411b and shields the plurality of rebound flow channels 415 without shielding the plurality of compression flow channels 414. Specifically, the first shielding assembly 412 is provided with an elastic member 416 and a valve plate 417. The valve plate 417 is movably sleeved on the connecting member 23. The elastic member 416 elastically abuts between the connecting member 23 and the valve plate 417 to make the valve plate 417 normally cover the plurality of rebound flow channels 415. The second shielding assembly 413 includes a plurality of diaphragms 418 arranged in a stack. The radial dimensions of at least two of the plurality of diaphragms 418 are different, and preferably gradually decrease toward the side away from the first side portion 411a to avoid excessive deformation.

[0027] When the movable rod assembly 20 moves toward the first position, the second elastic member 35 is compressed and the fluid moves from the first chamber 113 toward the second chamber 121. When the fluid reaches a predetermined pressure, the fluid can push against the valve plate 417 and elastically deform the elastic member 416. The fluid can enter the third chamber 42 from the fourth chamber 43 through the plurality of compression flow channels 414 and the second communication channel 231, as Figure 5 shown. The volume of the third chamber 42 gradually increases and the volume of the fourth chamber 43 gradually decreases, thereby providing resistance when the shock absorber 1 is compressed and reducing the impact force. When the movable rod assembly 20 moves toward the second position, the second elastic member 35 stretches and resets and the fluid moves from the second chamber 121 toward the first chamber 113. The fluid can push against the plurality of diaphragms 418 to elastically deform them. The fluid can flow back from the third chamber 42 to the fourth chamber 43 through the plurality of rebound flow channels 415 and the second communication channel 231, as Figure 7 shown, thereby providing resistance when the shock absorber 1 rebounds and reducing the vibration amplitude.

[0028] It should be specifically noted that the predetermined pressure required for the fluid to flow between the third chamber 42 and the fourth chamber 43 is bidirectionally adjustable. For example, the predetermined pressure required for the fluid to flow from the fourth chamber 43 to the third chamber 42 can be adjusted by selecting elastic members 416 with different elastic coefficients; the predetermined pressure required for the fluid to flow from the third chamber 42 to the fourth chamber 43 can also be adjusted by changing the number, thickness, and / or radial dimension of the plurality of diaphragms 418, thereby achieving the desired compression and rebound damping effects.

[0029] The shock absorber 1 further includes a damping adjustment mechanism 50. The damping adjustment mechanism 50 includes an adjustment rod needle 51 and an adjustment orifice 52. The fourth chamber 43 is located between the third chamber 42 and the first communication passage 32. The adjustment orifice 52 communicates between the second communication passage 231 and the third chamber 42. The adjustment rod needle 51 can be externally operated and move relative to the adjustment orifice 52 to change a radial cross-sectional area through which the fluid can flow through the adjustment orifice 52, thereby changing the flow rate of the fluid. Thus, when the radial cross-sectional area of the adjustment orifice 52 is smaller, the speed of the fluid flowing between the third chamber 42 and the fourth chamber 43 is slower and the damping is greater; conversely, when the radial cross-sectional area of the adjustment orifice 52 is larger, the speed of the fluid flowing between the third chamber 42 and the fourth chamber 43 is faster and the damping is smaller. In this embodiment, the adjustment rod needle 51 is disposed through the first rod member 21 and can be rotationally adjusted from one end of the first rod member 21; the damping adjustment mechanism 50 further includes a sleeve 53 and a first elastic member 54 located in the third communication passage 211. The sleeve 53 is screwed onto the first rod member 21 and is provided with the adjustment orifice 52. The first elastic member 54 elastically abuts between the adjustment rod needle 51 and the sleeve 53 to make the adjustment rod needle 51 tend to move away from the adjustment orifice 52, maintaining the flow passage unobstructed for the fluid to flow through.

[0030] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be encompassed by the present invention.

[0031] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment contains only an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A shock absorber, characterized in that include: A cylinder assembly is provided on a vehicle body so as not to be relatively movable, comprising an outer cylinder and an inner cylinder which is relatively non-movably sleeved inside the outer cylinder, the outer cylinder defines an axial direction and comprises a first end and a second end, a first chamber is formed between the outer cylinder and the inner cylinder, and a second chamber is formed between the inner cylinder, and a fluid is stored in the first chamber and the second chamber; A movable rod assembly is disposed in the cylinder assembly and can move relative to the cylinder assembly along the axial direction between a first position and a second position, comprising a first rod and a second rod, the second rod being connected to the first rod and being synchronously movable along the axial direction, the first rod protruding from the first end, and the second rod protruding from the second end; A first buffer unit, comprising a push member and at least one first connecting channel, wherein the push member is disposed on the first rod and located in the first chamber, and the at least one first connecting channel connects the first chamber and the second chamber; When the movable rod assembly moves from the first position to the second position, the movable rod assembly moves toward the side where the second end is provided, and the first rod member drives the push member to move along the axial direction, and the push member pushes the fluid to flow from the first chamber to the second chamber through the at least one first connecting channel.

2. A shock absorber according to claim 1, characterized in that: It also includes a second buffer unit, wherein the second buffer unit includes a valve component which is relatively immovably arranged on the movable rod component, the valve component is located in the second chamber and divides the second chamber into a third chamber and a fourth chamber.

3. A shock absorber according to claim 2, characterized in that: The movable rod assembly further comprises a connecting member connected between the first rod and the second rod, the connecting member is provided with a second connecting passage, and two ports of the second connecting passage are respectively connected to the third chamber and the fourth chamber.

4. A shock absorber according to claim 3, characterized in that: It also includes a damping adjustment mechanism, wherein the damping adjustment mechanism includes an adjustment rod needle and an adjustment port, the fourth chamber is located between the third chamber and the first connecting channel, the adjustment port is connected between the second connecting channel and the third chamber, the adjustment rod needle can be externally operated and moved relative to the adjustment port to change a radial cross-sectional area of ​​the adjustment port through which the fluid can flow.

5. A shock absorber according to claim 3, characterized in that: The first rod member is connected to the connecting member at one end thereof and is provided with a third connecting channel, the third connecting channel is axially connected to the second connecting channel and radially connected to the third chamber, the second rod member is connected to the connecting member at one end thereof and is provided with a fourth connecting channel, the fourth connecting channel is axially connected to the second connecting channel and radially connected to the fourth chamber.

6. A shock absorber according to claim 3, characterized in that: The first buffer unit further includes a buffer member set between the outer tube and the inner tube, a fifth chamber is formed between the buffer member and an outer peripheral surface of the inner tube, the buffer member is penetrated by a plurality of through holes connecting the first chamber and the fifth chamber, and the at least one first connecting channel is penetrated by the inner tube and connects the second chamber and the fifth chamber.

7. A shock absorber according to claim 6, characterized in that: The plurality of through holes and the at least one first connecting channel are staggered in a radial direction of the inner cylinder, and the number of the plurality of through holes is greater than the number of the at least one first connecting channel.

8. A shock absorber according to claim 1, characterized in that: In the axial direction, a length of the second chamber is smaller than a length of the first chamber and is at least 1 / 2 of the length of the first chamber.

9. A shock absorber according to claim 1, characterized in that: The inner cylinder is entirely located inside the outer cylinder and is coaxially arranged with the outer cylinder.

10. A shock absorber according to claim 4, characterized in that: The first rod member is connected to the connecting member at one end thereof and is provided with a third connecting channel, the third connecting channel is axially connected to the second connecting channel and radially connected to the third chamber, the second rod member is connected to the connecting member at one end thereof and is provided with a fourth connecting channel, the fourth connecting channel is axially connected to the second connecting channel and radially connected to the fourth chamber; the valve assembly is sleeved on the connecting member, the connecting member is screwed to the first rod member and the second rod member respectively; the damping adjustment mechanism further comprises a sleeve located in the third connecting channel and a first elastic member, the sleeve is screwed on the first rod member and is provided with the adjustment port, the first elastic member is elastically against the adjustment rod The first buffer unit further comprises a buffer member disposed between the outer tube and the inner tube, a fifth chamber is formed between the buffer member and an outer peripheral surface of the inner tube, the buffer member is provided with a plurality of through holes connecting the first chamber and the fifth chamber, the at least one first connecting channel is disposed in the inner tube and connects the second chamber and the fifth chamber; the plurality of through holes and the at least one first connecting channel are offset in a radial direction of the inner tube, the number of the plurality of through holes is greater than the number of the at least one first connecting channel; the aperture of each of the through holes is greater than an aperture of each of the first connecting channels; the at least one first connecting channel is located on a side of the inner cylinder close to the second end; in the axial direction, a length of the second chamber is less than a length of the first chamber and is at least 1 / 2 of the length of the first chamber; the inner cylinder is located as a whole in the outer cylinder and is coaxially arranged with the outer cylinder; the inner cylinder is located on a side of the outer cylinder close to the second end, and the buffer is located on a side of the inner cylinder close to the second end; the first buffer unit further includes a first washer and a second elastic member, the first washer is clamped between a side of the buffer away from the second end and the inner cylinder, and the second elastic member is elastically pressed against the push The outer cylinder further comprises a first cover and a second cover, the first cover and the second cover are respectively covered on the first end and the second end in a fluid-tight manner, the inner cylinder is threadedly connected to the buffer, and the buffer is threadedly connected to the second cover; and the cylinder assembly further comprises a positioning ring, a second washer and a third elastic member, the positioning ring is threadedly arranged on one end of the inner cylinder facing the push member, the second washer and the third elastic member are located between the positioning ring and the connecting member, the second washer is sleeved between the first rod and the inner cylinder, and the third elastic member is elastically against the second washer and the connecting member.

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