Damping device and wheelchair
By combining a bracket, drive unit, swing arm, and elastic element, the installation space and safety issues of wheelchair shock absorption devices are solved, achieving a safe and stable shock absorption effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN ROBOSPECTRA TECHNOLOGY CO LTD
- Filing Date
- 2024-12-03
- Publication Date
- 2026-07-24
AI Technical Summary
Existing wheelchair shock absorption devices require a certain amount of installation space and a corresponding installation structure, and spring shock absorption may result in low safety.
It adopts a combination structure of bracket, drive device, swing arm and elastic element. The drive device drives the wheel to rotate, which drives the swing arm to lift or lower synchronously. When the elastic element stretches or contracts, it converts the kinetic energy of the wheel into potential energy. The limit rod restricts the radial movement of the elastic element to avoid excessive deformation.
It improves the safety and stability of the shock absorption device, avoids excessive lifting or lowering of the wheels, and enhances ride comfort.
Smart Images
Figure CN224540477U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of mechanical equipment technology, and in particular to a shock absorption device and a wheelchair. Background Technology
[0002] People with disabilities and the elderly often need wheelchairs for mobility due to mobility issues, frailty, or other reasons. To ensure the comfort of wheelchair users, a shock-absorbing structure is essential. When installing a shock-absorbing structure on a wheelchair, a specific installation space and corresponding mounting structure must be designed. For example, when using spring-based shock absorbers, the springs may experience radial displacement, leading to compromised safety of the shock-absorbing device. Utility Model Content
[0003] This application provides a shock-absorbing device and a wheelchair, which can improve the safety of the shock-absorbing device.
[0004] This application provides a shock absorption device, comprising: The bracket is provided with a first limiting rod; A drive device is fixedly connected to the bracket, and the output end of the drive device is connected to the wheel. The drive device is used to drive the wheel to rotate relative to the bracket. A swing arm, which is fixed to the drive device, has one end rotatably connected to the bracket, and the other end of the swing arm is provided with a connecting part; An elastic element is hollow inside. One end of the elastic element is connected to the connecting part. One end of the first limiting rod extends into the elastic element from the other end of the elastic element. The other end of the elastic element abuts against or is fixedly connected to the bracket. The elastic element extends or contracts along the extension direction of the first limiting rod when the swing arm rotates.
[0005] Optionally, when the elastic member retracts to a first preset length, the first limiting rod abuts against the connecting portion to restrict the movement of the wheel relative to the bracket.
[0006] Optionally, the connecting part includes a connecting seat and a second limiting rod. The connecting seat is connected to the other end of the swing arm and extends to one side of the swing arm. One end of the second limiting rod is connected to the connecting seat, and the other end of the second limiting rod extends into the elastic member from one end of the elastic member. One end of the elastic member abuts against or is fixedly connected to the connecting seat. When the elastic member retracts to a first preset length, the first limiting rod abuts against the connecting seat to restrict the movement of the wheel relative to the bracket.
[0007] Optionally, the bracket is provided with a limiting part, and the limiting part and the first limiting rod are respectively located on both sides of the swing arm. When the elastic member extends to the second preset length, the limiting part abuts against the swing arm to restrict the movement of the wheel relative to the bracket.
[0008] Optionally, the limiting part is located below the swing arm, and the first limiting rod is located above the swing arm.
[0009] Optionally, the swing arm includes a first support arm, a second support arm, and a connecting arm. The connecting arm is fixedly connected to the driving device. One end of the first support arm is connected to the connecting arm, and the other end of the first support arm is connected to the connecting part. One end of the second support arm is connected to the connecting arm, and the other end of the second support arm is rotatably connected to the bracket. The first support arm and the second support arm extend in different directions.
[0010] Optionally, the outer contour of the driving device is a curved surface, the connecting arm is a curved rod, the concave side of the connecting arm is attached to and connected to the outer surface of the driving device, one end of the first support arm is connected to one end of the connecting arm, and one end of the second support arm is connected to the convex side of the connecting arm.
[0011] Optionally, the first support arm and the second support arm form an obtuse angle, and the acute angle formed by the first support arm and the second support arm is located on the side of the swing arm away from the drive device.
[0012] Optionally, the elastic element is a spring, a hollow air bladder, or a hollow sheet.
[0013] Optionally, the driving device is a drive motor, the motor shaft of the drive motor is fixedly connected to the wheel, and the motor shaft of the drive motor drives the wheel to rotate.
[0014] Optionally, the drive device includes a drive motor and a power output shaft. The motor shaft of the drive motor is fixedly connected to the power output shaft, and the power output shaft is fixedly connected to the wheel. The motor shaft of the drive motor drives the power output shaft to rotate, thereby causing the wheel to rotate.
[0015] The shock absorption device provided in this application includes: a bracket with a first limiting rod on it; a driving device fixedly connected to the bracket, with its output end connected to a wheel, and the driving device used to drive the wheel to rotate relative to the bracket; a swing arm fixed to the driving device, with one end of the swing arm rotatably connected to the bracket and the other end of the swing arm having a connecting portion; and an elastic element hollow inside, with one end of the elastic element connected to the connecting portion, one end of the first limiting rod extending into the elastic element from the other end of the elastic element, and the other end of the elastic element abutting against or fixedly connected to the bracket, and the elastic element extending or contracting along the extension direction of the first limiting rod when the swing arm rotates. When the wheel rises or falls in response to changes in the road surface, the shock absorption device of this application drives the drive unit and its swing arm to rise or fall synchronously. The other end of the swing arm rotates relative to the bracket, thereby causing the swing arm to compress or stretch the elastic element. When the elastic element stretches or contracts, it converts the kinetic energy of the wheel into potential energy, preventing the wheel from rising or falling too much and achieving the shock absorption function. Furthermore, since the first limiting rod extends into the elastic element, it can guide the elastic element to contract and prevent the elastic element from moving radially along the first limiting rod, thereby improving the safety of the shock absorption device. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments 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.
[0017] Figure 1 This is a schematic diagram of the structure of the shock absorption device provided in the embodiments of this application.
[0018] Figure 2 This is a schematic diagram of the structure of the shock absorption device provided in the embodiment of this application when the tire is removed.
[0019] Figure 3 This is a schematic diagram of the structure of the shock absorption device provided in the embodiment of this application when the wheel is removed.
[0020] Figure 4 This is another structural schematic diagram of the shock absorption device provided in the embodiments of this application when the wheel is removed.
[0021] Figure 5 This is a schematic diagram of the structure of the wheel side of the shock absorption device provided in the embodiment of this application.
[0022] Figure 6 This is a schematic diagram of the structure of the wheelchair provided in an embodiment of this application.
[0023] Explanation of reference numerals in the attached figures 11-Bracket 112-First Limiting Rod 113-Limiting Part 12-Drive device 121-Drive motor 13-Wheel 132-Rim 131-Tire 139-Power Take-Off Shaft 14-Elastic element 15-Swing arm 151-First support arm 152-Second support arm 153-Connecting arm; 154-Connecting seat; 155-Second limit rod 156-Connecting part 20-Wheelchair 21-Front Wheel 22-Battery Compartment 23-Side bar 24-Roller Detailed Implementation The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.
[0024] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, 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 indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0025] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0026] This application provides a shock-absorbing device. This shock-absorbing device is installed on the bottom of a wheelchair to absorb shocks. It should be noted that the shock-absorbing device provided in this application can be used in wheelchairs, strollers, bicycles, electric vehicles, motorcycles, scooters, and other mobility devices. See Figures 1-4 In this embodiment, the shock absorption device includes a bracket 11, a drive device 12, a swing arm 15, and an elastic element 14. The bracket 11 is provided with a first limiting rod 112; the drive device 12 is fixedly connected to the bracket 11, and its output end is fixedly connected to a wheel 13. The drive device 12 is used to drive the wheel 13 to rotate relative to the bracket 11; the swing arm 15 is fixed to the drive device 12, one end of the swing arm 15 is rotatably connected to the bracket 11, and the other end of the swing arm 15 is provided with a connecting portion 156; the elastic element 14 is hollow inside, one end of the elastic element 14 is connected to the connecting portion 156, one end of the first limiting rod 112 extends into the elastic element 14 from the other end, and the other end of the elastic element 14 abuts against or is fixedly connected to the bracket 11. When the swing arm 15 rotates, the elastic element 14 extends or contracts along the extending direction of the first limiting rod 112.
[0027] In this embodiment, when the elastic member 14 retracts to the first preset length, the first limiting rod 112 abuts against the connecting part 156 to restrict the movement of the wheel 13 relative to the bracket 11.
[0028] In some embodiments of this application, the bracket 11 is a rigid component that serves to support and mount parts. The bracket 11 can be made of materials such as steel, iron, aluminum, or alloys, possessing high rigidity and strength, and is not easily deformed upon impact, thus ensuring the overall stability of the wheelchair. The specific structure and shape of the bracket 11 are not limited here, and can be selectively designed according to the wheelchair's appearance and the layout of its internal components.
[0029] In this embodiment, the drive device 12 includes a drive motor 121 and a power output shaft 139. The motor shaft of the drive motor 121 is fixedly connected to the power output shaft 139, and the power output shaft 139 is fixedly connected to the wheel 13. The motor shaft of the drive motor 121 drives the power output shaft 139 to rotate, thereby causing the wheel 13 to rotate around the power output shaft 139. The drive motor 121 is fixedly connected to the bracket 11.
[0030] Furthermore, the motor shaft of the drive motor 121 and the power output shaft 139 are connected via a transmission mechanism to rotate synchronously. The motor shaft of the drive motor 121 and the power output shaft 139 can be directly coaxially connected for synchronous rotation; alternatively, they can be discoaxially connected via a transmission mechanism such as a conveyor belt or chain for synchronous rotation. When the wheel 13 travels on an uneven or bumpy road surface, the wheel 13 will rise or fall accordingly. Since the motor shaft of the drive motor 121 in the drive device 12 is fixedly connected to the power output shaft 139, and the power output shaft 139 is connected to the wheel 13, and the drive motor 121 is fixedly connected to the bracket 11, when the wheel 13 rises or falls accordingly with the change of the road surface, the wheel 13 drives the drive device 12 and the swing arm 15 on it to rise or fall synchronously. One end of the swing arm 15 is rotatably connected to the bracket 11, and the other end of the swing arm 15 rotates relative to the bracket 11, thereby causing the swing arm 15 to compress or stretch the elastic member 14. When the elastic member 14 stretches or contracts, it converts the kinetic energy of the wheel 13 into potential energy, preventing the wheel 13 from rising or falling too much, thus achieving the shock absorption function. Furthermore, since the first limiting rod 112 extends into the elastic member 14, it can guide the elastic member 14 to contract, preventing the elastic member 14 from moving radially along the first limiting rod 112, thereby improving the shock absorption effect. When the elastic element 14 retracts to the first preset length, the first limiting rod 112 abuts against the connecting part 156 to restrict the movement of the wheel 13 relative to the bracket 11, so as to prevent the elastic element 14 from being damaged due to excessive retraction.
[0031] In another embodiment, the drive device 12 is a drive motor, the motor shaft of the drive motor is fixedly connected to the wheel 13, and the motor shaft of the drive motor drives the wheel 13 to rotate.
[0032] When the drive unit 12 drives the power output shaft 139 to rotate, it causes the wheel 13 to rotate relative to the bracket 11 around the power output shaft 139. The wheel 13 rotates counterclockwise relative to the bracket 11 around the power output shaft 139 to roll forward, or rotates clockwise relative to the bracket 11 around the power output shaft 139 to roll backward. The output end of the drive unit 12 can provide rotational force, and the output end of the drive unit 12 can only rotate relative to the drive unit 12, and the output end of the drive unit 12 translates with the drive unit 12.
[0033] The wheel 13 includes a hub 132 and a tire 131 surrounding the outer side of the hub 132. The tire 131 can be made of rubber. The hub 132 is connected to the power output shaft 139. When the drive device 12 drives the power output shaft 139 to rotate, it drives the hub 132 to rotate, which in turn drives the tire 131 to rotate, thereby causing the wheel 13 to rotate relative to the bracket 11 around the power output shaft 139.
[0034] In this embodiment, the bracket 11 is provided with a limiting part 113. The limiting part 113 and the first limiting rod 112 are respectively located on both sides of the swing arm 15. When the elastic member 14 extends to the second preset length, the limiting part 113 abuts against the swing arm 15 to restrict the movement of the wheel 13 relative to the bracket 11. The limiting part 113 can be a rod parallel to the power output shaft 139, and can be set according to specific circumstances. This application does not limit it. When the wheel 13 rises or falls in response to changes in the road surface, the wheel 13 drives the drive device 12 and its swing arm 15 to rise or fall synchronously. One end of the swing arm 15 is rotatably connected to the bracket 11, so that the swing arm 15 squeezes or stretches the elastic member 14. When the elastic member 14 contracts to the first preset length, the first limit rod 112 abuts against the connecting part 156 to restrict the movement of the wheel 13 relative to the bracket 11, so as to avoid damage caused by the elastic member 14 contracting too short. When the elastic member 14 extends to the second preset length, the limit part 113 abuts against the swing arm 15 to restrict the movement of the wheel 13 relative to the bracket 11, so as to avoid damage caused by the elastic member 14 extending too long, thus providing protection when the elastic member 14 is extended or retracted.
[0035] In this embodiment, the limiting part 113 is located below the swing arm 15, and the first limiting rod 112 is located above the swing arm 15. When the wheel 13 rises accordingly with changes in the road surface, the swing arm 15 rotates counterclockwise, thereby causing the swing arm 15 to compress the elastic member 14. When the elastic member 14 contracts to a first preset length, the first limiting rod 112 abuts against the connecting part 156 to restrict the movement of the wheel 13 relative to the bracket 11, preventing the elastic member 14 from being damaged due to excessive contraction. When the wheel 13 falls accordingly with changes in the road surface, the swing arm 15 rotates clockwise, thereby causing the swing arm 15 to stretch the elastic member 14. When the elastic member 14 extends to a second preset length, the limiting part 113 abuts against the swing arm 15 to restrict the movement of the wheel 13 relative to the bracket 11, preventing the elastic member 14 from being damaged due to excessive extension, thus providing protection during the extension and retraction of the elastic member 14. Since one end of the swing arm 15 is connected to the elastic element 14, placing the first limiting rod 112 above the swing arm 15 provides ample space for installing the connecting elastic element 14, facilitating its installation. In other embodiments, the limiting part 113 can be positioned above the swing arm 15, with the first limiting rod 112 located below the swing arm 15; the specific placement depends on the situation.
[0036] In this embodiment, the swing arm 15 includes a first support arm 151, a second support arm 152, and a connecting arm 153. The connecting arm 153 is fixedly connected to the drive device 12. One end of the first support arm 151 is connected to the connecting arm 153, and the other end of the first support arm 151 is connected to the connecting portion 156. One end of the second support arm 152 is connected to the connecting arm 153, and the other end of the second support arm 152 is rotatably connected to the bracket 11. The first support arm 151 and the second support arm 152 extend in different directions. The different extension directions of the first support arm 151 and the second support arm 152 of the swing arm 15 allow for more flexible installation of the elastic element 14.
[0037] In this embodiment, the outer contour of the drive device 12 is curved, and the connecting arm 153 is a curved rod. The concave side of the connecting arm 153 is attached to and connected to the outer surface of the drive device 12. One end of the first support arm 151 is connected to one end of the connecting arm 153, and one end of the second support arm 152 is connected to the convex side of the connecting arm 153. By connecting the drive device 12 with the curved connecting arm 153, the connection stability between the swing arm 15 and the drive device 12 can be improved, thereby improving the stability of the shock absorption device.
[0038] In this embodiment, the first support arm 151 and the second support arm 152 form an obtuse angle, and the acute angle formed by the first support arm 151 and the second support arm 152 is located on the side of the swing arm 15 away from the drive device 12. When the position of the first support arm 151 remains unchanged, the second support arm 152 moves closer to the first limiting rod 112, thus saving more space.
[0039] In this embodiment, the elastic element 14 is a spring, a hollow air bladder, or a hollow sheet.
[0040] See Figure 5 In this embodiment of the application, the connecting part 156 includes a connecting seat 154 and a second limiting rod 155. The connecting seat 154 is connected to the other end of the swing arm 15 and extends to one side of the swing arm 15. One end of the second limiting rod 155 is connected to the connecting seat 154, and the other end of the second limiting rod 155 extends into the elastic member 14 from one end of the elastic member 14. One end of the elastic member 14 abuts against or is fixedly connected to the connecting seat 154. When the elastic member 14 retracts to the first preset length, the first limiting rod 112 abuts against the connecting seat 154 to restrict the movement of the wheel 13 relative to the bracket 11.
[0041] The first limiting rod 112 and the second limiting rod 155 extend into the elastic member 14 from both ends, guiding the elastic member 14 to contract simultaneously from both sides. This further prevents the elastic member 14 from moving radially along the first limiting rod 112, improving the shock absorption effect. When the elastic member 14 contracts to a first preset length, the first limiting rod 112 abuts against the second limiting rod 155, restricting the movement of the wheel 13 relative to the bracket 11 and preventing the elastic member 14 from contracting too short and causing damage.
[0042] See Figure 6 This application also provides a wheelchair, which includes any of the above-mentioned shock-absorbing devices. Specifically, the wheelchair includes a frame 20 and two shock-absorbing devices on both sides of the frame 20, with the wheels 13 in the shock-absorbing devices being the rear wheels of the wheelchair. The wheelchair also includes two front wheels 21. A battery compartment 22 is provided on the frame 20, located between the two shock-absorbing devices. A tail rod 23 extends from one side of the frame 20, with rollers 24 at both ends of the tail rod 23. When the wheelchair tilts backward, the rollers 24 at both ends of the tail rod 23 provide support.
[0043] Combination Figures 1 to 6 When wheel 13 is subjected to bumps and moves up and down, and when wheel 13 rises or falls accordingly with changes in the road surface, wheel 13 drives drive device 12 and its swing arm 15 to rise or fall synchronously. One end of swing arm 15 is rotatably connected to bracket 11. Swing arm 15 swings counterclockwise or clockwise relative to bracket 11. When swing arm 15 rotates clockwise, it can be understood as wheel 13 sinking when it encounters a pothole. When swing arm 15 swings counterclockwise, it can be understood as wheel 13 rising when it encounters a protrusion. The swing arm 15 rotates clockwise, causing it to stretch the elastic element 14. When the elastic element 14 extends to a second preset length, that is, when the swing arm 15 swings clockwise to a predetermined angle, the swing arm 15 abuts against the limiting part 113 to prevent the swing arm 15 from continuing to rotate clockwise and to avoid damage caused by excessive extension of the elastic element 14. The swing arm 15 rotates counterclockwise, causing it to stretch the elastic element 14. When the elastic element 14 contracts to a first preset length, that is, when the swing arm 15 swings counterclockwise to a predetermined angle, the first limiting rod 112 abuts against the swing arm 15 to restrict the movement of the wheel 13 relative to the bracket 11 and to avoid damage caused by excessive contraction of the elastic element 14. Therefore, the first limiting rod 112 and the limiting part 113 can limit the rotation angle of the swing arm 15, prevent the wheel 13 from moving too far up and down, thus preventing the wheelchair user from feeling the seat "bouncing up and down," and reduce interference between the wheel 13 and the vehicle body.
[0044] The shock absorption device provided in this application includes: a bracket with a first limiting rod on it; a power output shaft connected to a wheel; a drive device fixedly connected to the bracket, with its output end fixedly connected to the power output shaft, the drive device being used to drive the power output shaft to rotate and cause the wheel to rotate relative to the bracket around the power output shaft; a swing arm fixed to the drive device, one end of the swing arm being rotatably connected to the bracket, and the other end of the swing arm having a connecting portion; an elastic element hollow inside, one end of the elastic element being connected to the connecting portion, one end of the first limiting rod extending into the elastic element from the other end of the elastic element, the other end of the elastic element abutting against or fixedly connected to the bracket, the elastic element extending or contracting along the extension direction of the first limiting rod when the swing arm rotates, and the first limiting rod abutting against the connecting portion to restrict the movement of the wheel relative to the bracket when the elastic element contracts to a first preset length. The shock absorption device of this application, when the wheel rises or falls accordingly with changes in the road surface, drives the drive device and its swing arm to rise or fall synchronously. The other end of the swing arm rotates relative to the bracket, thereby causing the swing arm to compress or stretch the elastic element. When the elastic element stretches or contracts, it converts the kinetic energy of the wheel into potential energy, preventing the wheel from rising or falling too much, thus achieving the shock absorption function. Furthermore, since the first limiting rod extends into the elastic element, it can guide the elastic element to contract, preventing the elastic element from moving radially along the first limiting rod. When the elastic element contracts to the first preset length, the first limiting rod abuts against the connecting part to restrict the movement of the wheel relative to the bracket, preventing the elastic element from contracting too short and causing damage, thereby improving the safety of the shock absorption device.
[0045] The shock absorption device and wheelchair provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.
Claims
1. A shock absorption device, characterized in that, include: The bracket is provided with a first limiting rod; A drive device is fixedly connected to the bracket, and the output end of the drive device is connected to the wheel. The drive device is used to drive the wheel to rotate relative to the bracket. A swing arm, which is fixed to the drive device, has one end rotatably connected to the bracket, and the other end of the swing arm is provided with a connecting part; An elastic element is hollow inside. One end of the elastic element is connected to the connecting part. One end of the first limiting rod extends into the elastic element from the other end of the elastic element. The other end of the elastic element abuts against or is fixedly connected to the bracket. The elastic element extends or contracts along the extension direction of the first limiting rod when the swing arm rotates.
2. The shock absorption device according to claim 1, characterized in that, When the elastic element retracts to a first preset length, the first limiting rod abuts against the connecting portion to restrict the movement of the wheel relative to the bracket.
3. The shock absorption device according to claim 2, characterized in that, The connecting part includes a connecting seat and a second limiting rod. The connecting seat is connected to the other end of the swing arm and extends to one side of the swing arm. One end of the second limiting rod is connected to the connecting seat, and the other end of the second limiting rod extends into the elastic member from one end of the elastic member. One end of the elastic member abuts against or is fixedly connected to the connecting seat. When the elastic member retracts to a first preset length, the first limiting rod abuts against the connecting seat to restrict the movement of the wheel relative to the bracket.
4. The shock absorption device according to claim 2, characterized in that, The bracket is provided with a limiting part, and the limiting part and the first limiting rod are respectively located on both sides of the swing arm. When the elastic element extends to the second preset length, the limiting part abuts against the swing arm to restrict the movement of the wheel relative to the bracket.
5. The shock absorption device according to claim 4, characterized in that, The limiting part is located below the swing arm, and the first limiting rod is located above the swing arm.
6. The shock absorption device according to claim 1, characterized in that, The swing arm includes a first support arm, a second support arm, and a connecting arm. The connecting arm is fixedly connected to the driving device. One end of the first support arm is connected to the connecting arm, and the other end of the first support arm is connected to the connecting part. One end of the second support arm is connected to the connecting arm, and the other end of the second support arm is rotatably connected to the bracket. The first support arm and the second support arm extend in different directions.
7. The shock absorption device according to claim 6, characterized in that, The outer contour of the drive device is curved, the connecting arm is a curved rod, the concave side of the connecting arm is attached to and connected to the outer surface of the drive device, one end of the first support arm is connected to one end of the connecting arm, and one end of the second support arm is connected to the convex side of the connecting arm.
8. The shock absorption device according to claim 6, characterized in that, The first support arm and the second support arm form an obtuse angle, and the acute angle formed by the first support arm and the second support arm is located on the side of the swing arm away from the drive device.
9. The shock absorption device according to claim 1, characterized in that, The elastic element is a spring, a hollow air bladder, or a hollow sheet.
10. The shock absorption device according to claim 1, characterized in that, The driving device is a drive motor, the motor shaft of the drive motor is fixedly connected to the wheel, and the motor shaft of the drive motor drives the wheel to rotate.
11. The shock absorption device according to claim 1, characterized in that, The drive device includes a drive motor and a power output shaft. The motor shaft of the drive motor is fixedly connected to the power output shaft, and the power output shaft is fixedly connected to the wheel. The motor shaft of the drive motor drives the power output shaft to rotate, thereby causing the wheel to rotate.
12. A wheelchair, characterized in that, The wheelchair includes the shock absorption device according to any one of claims 1-11.
13. The wheelchair according to claim 12, characterized in that, The wheelchair includes a frame and two shock-absorbing devices disposed on both sides of the frame, wherein the wheels of the shock-absorbing devices are the rear wheels of the wheelchair.