Wheel chair rear wheel damping device

Abstract

The utility model discloses a wheel chair rear wheel damping device which comprises a side frame body, a spring damper and a wheel chair rear wheel, the middle of the wheel chair rear wheel is connected with an axle core, the spring damper inclines forwards, and an upper end connector of the spring damper is connected to the rear upper portion of the side frame body through an upper hinge device. A rear shaft rod arranged backwards is hinged to the lower middle section of the rear portion of the side frame body through a middle hinge device, a lower end connector of the spring shock absorber is connected to the rear shaft rod through a lower hinge device, a wheel shaft through hole is formed in the rear shaft rod, and the wheel shaft core penetrates through the wheel shaft through hole and is fixedly connected with the wheel shaft through hole. The spring shock absorbers can be flexibly connected to different positions of the rear portion of the side frame body and are suitable for wheelchair rear wheels with different diameters, and all parts are convenient to install and replace.

Description

TECHNICAL FIELD

[0001] The utility model relates to a wheelchair technical field, concretely is a wheelchair rear wheel damping device. BACKGROUND

[0002] 1、The existing Chinese patent document publication number: CN 219878483U Disclosed is a castor damping device, which comprises a castor, a chair side frame, a protruding screw shaft core transversely penetrating the center of the castor, and an active connection between the screw shaft core and the center of the castor; the chair side frame comprises at least a vertical rod and a lower horizontal rod, the bottom of the vertical rod is fixedly connected to the lower horizontal rod, a damping device is active connected between the vertical rod and the lower horizontal rod, and the screw shaft core is transversely fixedly connected to the damping device; the damping device comprises a transverse damping connecting piece and a vertical damping cylinder, the transverse damping connecting piece is arranged transversely, the vertical damping cylinder is arranged longitudinally, the front end of the transverse damping connecting piece is active connected to the vertical rod, and the rear end is active connected to the telescopic rod of the vertical damping cylinder; the cylinder seat of the vertical damping cylinder is active connected to the lower horizontal rod; the screw shaft core is transversely fixedly connected to the transverse damping connecting piece; the lower horizontal rod is fixedly connected upward to an ear, and the ear is active connected to the cylinder seat of the vertical damping cylinder.

[0003] The above-mentioned damping device cannot adapt to rear wheels with different diameters, and has a narrow application range; the damping device is arranged below the screw shaft core, which lifts the weight of the wheelchair and the gravity of the person sitting on the wheelchair, and the damping effect is not ideal.

[0004] 2、The existing Chinese patent document publication number: CN219743151U discloses a damping mechanism for a wheelchair and a wheelchair, which comprises a sleeve, a support, a shock absorber, a spring, a locking piece and a connecting rod, two sleeves are slidingly installed on the legs of the seat and locked by the locking piece, the support is installed on one of the sleeves, one end of the connecting rod is hinged to the other sleeve, one end of the shock absorber is hinged to the other end of the connecting rod, the other end of the shock absorber is hinged to the support, the spring is installed on the shock absorber, and the wheel shaft is installed on the connecting rod.

[0005] The above-mentioned damping mechanism for a wheelchair and the wheelchair change the straight-up and straight-down damping movement into a mixed movement of vertical movement and horizontal movement, effectively avoiding the large fluctuation and hard impact feeling brought to the user when the wheelchair is damped, but the locking piece is prone to wear after long-term use, resulting in poor damping effect of the product, and even possible locking failure, which may cause safety problems. UTILITY MODEL CONTENTS

[0006] To solve the above technical problems, the utility model provides a kind of wheelchair rear wheel shock absorber of different diameters and safe, durable, which can be applied to different diameters of rear wheel.By being arranged in rear axle rod in rear lower segment of side frame body hinge and being connected with spring shock absorber lower end, spring shock absorber can be connected in different positions of rear lower segment of side frame body rear, suitable for different diameters of rear wheel.The solution to the above technical problems is:

[0007] A kind of wheelchair rear wheel shock absorber, including side frame body, spring shock absorber, wheelchair rear wheel, the middle of the wheelchair rear wheel is connected with wheel axle core, the upper end joint of spring shock absorber is inclined forward, it is connected in the rear upper portion of side frame body by upper hinge device, the rear axle rod arranged rearward is hinged in rear lower segment of side frame body rear portion by middle hinge device, the lower end joint of spring shock absorber is connected in the rear axle rod by lower hinge device, wheel axle through-hole is equipped on the rear axle rod, the wheel axle core penetrates the wheel axle through-hole and is fixedly connected.

[0008] Further of preferred technical scheme: the rear axle rod and the side frame body are arranged in the same axial direction;The rear axle rod is horizontally arranged;The lower end of the spring shock absorber is below the wheel axle through-hole, and the lower end of the spring shock absorber is kept in the same vertical line with the wheel axle through-hole.

[0009] Further of preferred technical scheme: the side frame body includes an upper horizontal rod and a rear vertical rod, the rear section of the upper horizontal rod is fixedly connected to the rear vertical rod;The middle hinge device includes a rear elbow, a rear hinge stud, a screw assembly and a U-shaped lug joint fixedly connected to the front end of the rear axle rod, the rear elbow is connected to the bottom end of the rear vertical rod and is integrally formed by extending rearward from the bottom end of the rear vertical rod;The rear hinge stud is fixedly connected to the rear end of the rear elbow, and the rear hinge stud is inserted into the U-shaped mouth of the U-shaped lug joint;The screw assembly passes through the right side of the U-shaped lug joint, the rear hinge stud, the left side of the U-shaped lug joint and is fixedly connected by a nut.

[0010] Further of preferred technical scheme: the left and right ends of the rear hinge stud have a wider cross section;The left and right sides of the U-shaped lug joint are lug plates, and the left and right sides of the lug plates clamp the rear hinge stud with a wider cross section at the left and right ends.

[0011] Further of preferred technical scheme: the upper hinge device includes an upper U-shaped lug plate and an upper bolt assembly, the upper U-shaped lug plate is fixedly connected to the rear portion of the middle section of the rear vertical rod;The upper end joint of the spring shock absorber is inserted into the U-shaped mouth of the upper U-shaped lug plate, the upper bolt assembly transversely passes through the upper U-shaped lug plate and the upper end joint of the spring shock absorber to be fixedly connected, and the upper end joint of the spring shock absorber is hingedly connected to the upper U-shaped lug plate.

[0012] The lower articulation device comprises a lower U-shaped lug plate and a lower bolt assembly, the lower U-shaped lug plate is fixedly connected to the top of the rear axle rod; the lower end joint of the spring shock absorber is inserted into the U-shaped mouth of the lower U-shaped lug plate, the lower bolt assembly is fixedly connected by penetrating the lower U-shaped lug plate and the lower end joint of the spring shock absorber, and the lower end joint of the spring shock absorber is articulately connected with the lower U-shaped lug plate.

[0013] The rear vertical rod, the rear axle rod and the spring shock absorber are arranged in a triangular shape.

[0014] Further preferred technical solutions: the side frame body comprises an upper cross rod and a rear vertical rod, the rear section of the upper cross rod is fixedly connected to the rear vertical rod; the middle articulation device comprises a stud joint short rod, a rear articulation stud joint, a screw rod assembly and a U-shaped lug joint fixedly connected to the front end of the rear axle rod, the front end of the stud joint short rod is connected to the middle section of the rear vertical rod, the stud joint short rod is arranged rearward, the rear articulation stud joint is fixedly connected to the rear end of the stud joint short rod in a transverse manner, and the rear articulation stud joint is inserted into the U-shaped mouth of the U-shaped lug joint; the screw rod assembly is fixedly connected by penetrating the right side of the U-shaped lug joint, the rear articulation stud joint, the left side of the U-shaped lug joint and a nut.

[0015] Further preferred technical solutions: the left and right ends of the rear articulation stud joint have a wider cross section; the left and right sides of the U-shaped lug joint are lug plates, and the lug plates on the left and right sides clamp the rear articulation stud joint with a wider cross section at the left and right ends.

[0016] Further preferred technical solutions: the rear section of the upper cross rod is a section behind the connecting point between the rear vertical rod and the upper cross rod.

[0017] Further preferred technical solutions: the upper articulation device comprises an upper U-shaped lug plate and an upper bolt assembly, the upper U-shaped lug plate is fixedly connected to the bottom of the rear section of the upper cross rod; the upper end joint of the spring shock absorber is inserted into the U-shaped mouth of the upper U-shaped lug plate, the upper bolt assembly is fixedly connected by penetrating the upper U-shaped lug plate and the upper end joint of the spring shock absorber, and the upper end joint of the spring shock absorber is articulately connected with the upper U-shaped lug plate.

[0018] The lower articulation device comprises a lower U-shaped lug plate and a lower bolt assembly, the lower U-shaped lug plate is fixedly connected to the top of the rear axle rod; the lower end joint of the spring shock absorber is inserted into the U-shaped mouth of the lower U-shaped lug plate, the lower bolt assembly is fixedly connected by penetrating the lower U-shaped lug plate and the lower end joint of the spring shock absorber, and the lower end joint of the spring shock absorber is articulately connected with the lower U-shaped lug plate.

[0019] The rear vertical rod, the rear axle rod and the spring shock absorber form a triangular layout.

[0020] Further of the preferred technical solutions: the spring shock absorber is inclined forward by an angle of 15° to 75°.

[0021] The wheelchair rear wheel damping device has the following advantages: 1. The spring shock absorber can be connected flexibly at different positions at the rear of the side frame, and is suitable for wheelchair rear wheels with different diameters. 2. The design that the lower end of the spring shock absorber is kept on the same vertical line with the wheel shaft through hole can effectively absorb the force of the oblique and horizontal vibration, relieve the vibration, achieve good buffering effect, and make the product more stable and safe. 3. The rear hinged column head is provided with a wide cross section at the left and right ends, which effectively increases the connection area of the U-shaped lug joint and the rear hinged column head, and prevents left and right shaking. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a rear right perspective view of the product embodiment one of the utility model;

[0023] Figure 2 It is a front right perspective view of the product embodiment one of the utility model;

[0024] Figure 3 It is a left view of the product embodiment one of the utility model;

[0025] Figure 4 It is a right view of the product embodiment one of the utility model;

[0026] Figure 5 It is a rear right split view of the product embodiment one of the utility model;

[0027] Figure 6 It is a front right split view of the product embodiment one of the utility model

[0028] Figure 7 It is a rear right perspective view of the product embodiment two of the utility model;

[0029] Figure 8 It is a front right perspective view of the product embodiment two of the utility model;

[0030] Figure 9 It is a left view of the product embodiment two of the utility model;

[0031] Figure 10 It is a right view of the product embodiment two of the utility model;

[0032] Figure 11 It is a rear right split view of the product embodiment two of the utility model;

[0033] Figure 12The front right split view of the second embodiment of the utility model is shown.

[0034] The side frame body (1), spring shock absorber (2), wheelchair rear wheel (3), wheel shaft core (4), upper hinge device (5), upper U-shaped lug plate (5.1), upper bolt assembly (5.2), middle hinge device (6), rear elbow (6.1), rear hinge stud (6.2), screw rod assembly (6.3), U-shaped lug joint (6.4), stud connecting short rod (6.5), lower hinge device (7), lower U-shaped lug plate (7.1), lower bolt assembly (7.2), rear axle rod (8), wheel shaft through hole (9), upper cross rod (10), rear vertical rod (11) DETAILED DESCRIPTION

[0035] The utility model provides a kind of wheelchair rear wheel damping device, including side frame body 1, spring shock absorber 2, wheelchair rear wheel 3, the middle of the wheelchair rear wheel 3 is connected with integrated wheel shaft core 4 across movably.The spring shock absorber 2 is inclined forward, and its upper end joint is hingedly connected in the rear upper portion of the side frame body 1 by upper hinge device 5, the rear middle lower section of the side frame body 1 is hingedly arranged rear axle rod 8 by middle hinge device 6, and the lower end joint of the spring shock absorber 2 is connected in the rear axle rod 8 by lower hinge device 7, the rear axle rod 8 is equipped with wheel shaft through hole 9, the end of the wheel shaft core 4 is equipped with thread, and the wheel shaft core 4 is fixedly connected by nut and passes through the wheel shaft through hole 9.Spring shock absorber can be flexibly connected in different positions of the rear portion of side frame body, is suitable for different diameter wheelchair rear wheel, and each component is convenient to install and replace;When the product works, when wheelchair rear wheel 3 passes through pit, bump, bump, uneven road, its vibration source is transmitted to rear axle rod 8 by wheel shaft core 4, then is transmitted to spring shock absorber 2 by rear axle rod 8, is damped by spring shock absorber 2, in the vibration process, rear axle rod 8 is up and down by middle hinge device 6, and the both ends of spring shock absorber 2 are active by upper hinge device 5 and lower hinge device 7;Spring shock absorber 2 is supported and fixed by side frame body 1 and rear axle rod 8;The above structure is suitable for the installation of large wheel wheelchair rear wheel 3, and is suitable for the installation of small wheel wheelchair rear wheel 3, can be installed with different diameter wheelchair rear wheel, whether the installation of large wheel wheelchair rear wheel 3 or small wheel wheelchair rear wheel 3, its stress is balanced, when pit, bump, bump, uneven road is encountered, balanced damping effect is reached, and its damping effect is good.The wheel shaft core 4 of the product wheelchair rear wheel 3 is above spring shock absorber 2, and the weight of wheelchair and the gravity of person are pressed down by spring shock absorber 2, and the damping state is handled in long-term normal state, and its damping effect is good.

[0036] The rear axle rod 8 and the side frame body 1 of this invention are arranged along the same axis, which facilitates the installation of the wheel axle core 4. The rear axle rod 8 is horizontally arranged, so that the rear wheel 3 of the wheelchair is initially installed horizontally. The lower end of the spring shock absorber 2 is below the wheel axle through hole 9, and the lower end of the spring shock absorber 2 is on the same vertical line as the wheel axle through hole 9. The rear wheel 3 of the wheelchair supports the weight of the wheelchair and the gravity of the person sitting behind it, while the wheel axle core 4 is the center point of weight and gravity support. The lower end of the spring shock absorber 2 is below the wheel axle core 4, so the spring shock absorber 2 acts as the central support for the weight of the wheelchair and the person's gravity. It has good support stability and firmness, direct vibration source transmission, and better vibration absorption, so the shock absorption effect is good. This design allows the forces of oblique and lateral vibrations to effectively absorb and cancel each other, alleviate vibration, and achieve a good buffering effect.

[0037] Example 1

[0038] like Figures 1-6 As shown, a wheelchair rear wheel shock absorption device includes a side frame body 1, a spring shock absorber 2, and a wheelchair rear wheel 3. An integrally formed wheel axle core 4 is movably connected through the middle of the wheelchair rear wheel 3. The spring shock absorber 2 is tilted forward, and its upper end is hinged to the upper rear part of the side frame body 1 via an upper hinge device 5. A rear axle rod 8 is hinged to the lower rear section of the side frame body 1 via a middle hinge device 6. The lower end of the spring shock absorber 2 is connected to the rear axle rod 8 via a lower hinge device 7. The rear axle rod 8 has a wheel axle through hole 9, and the wheel axle core 4 has a threaded end. The wheel axle core 4 passes through the wheel axle through hole 9 and is fixedly connected by a nut.

[0039] The rear axle rod 8 and the side frame body 1 of this utility model are arranged in the same axial direction, which facilitates the installation of the wheel axle core 4; the rear axle rod 8 is arranged horizontally, so that the rear wheel 3 of the wheelchair is installed horizontally in the initial state; the lower end of the spring shock absorber 2 is below the wheel axle through hole 9, and the lower end of the spring shock absorber 2 and the wheel axle through hole 9 are kept on the same vertical line.

[0040] The utility model discloses a side frame body 1 includes upper cross bar 10, rear vertical pole 11, the rear section of upper cross bar 10 is downwardly welded fixedly integrated connection rear vertical pole 11, middle part articulation device 6 includes rear elbow 6.1, rear articulation column head 6.2, screw rod assembly 6.3 and the U-shaped lug joint 6.4 of fixed integrated connection in rear axle 8 front end, rear elbow 6.1 is connected in rear vertical pole 11 bottom end, and rear elbow 6.1 is formed by the bottom end integrated type rear vertical pole 11 rear extension, rear articulation column head 6.2 is laterally welded fixedly integrated in the rear end of rear elbow 6.1, and rear articulation column head 6.2 is inserted in the U-shaped mouth of U-shaped lug joint 6.4, screw rod assembly 6.3 passes through the right side of U-shaped lug joint 6.4, rear articulation column head 6.2, the left side of U-shaped lug joint 6.4 and is fixedly connected by the nut.

[0041] The utility model discloses the left and right ends of rear articulation column head 6.2 have relatively wide cross section, and the left and right sides of U-shaped lug joint 6.4 are lug plate, and the left and right sides lug plate clamping left and right ends relatively wide cross section rear articulation column head 6.2. The design of the left and right ends of rear articulation column head having relatively wide cross section cooperates with lug plate, effectively increases the area of the connection of U-shaped lug joint and rear articulation column head, prevents left and right shaking.

[0042] The utility model discloses upper articulation device 5 includes upper U-shaped lug plate 5.1 and upper bolt assembly 5.2, upper U-shaped lug plate 5.1 fixed welding / integrally formed connection in rear vertical pole 11 middle section rear part, the upper end joint of spring shock absorber 2 is inserted in the U-shaped mouth of upper U-shaped lug plate 5.1, and upper bolt assembly 5.2 traverses upper U-shaped lug plate 5.1 and the upper end joint of spring shock absorber 2 and is connected fixed (that is: in the upper U-shaped lug plate 5.1 and the upper end joint of spring shock absorber 2 set up through -hole, and upper bolt assembly 5.2 passes through from through -hole, and is fixedly connected by the bolt rod of upper bolt assembly 5.2 and nut cooperation), and the upper end joint of spring shock absorber 2 is articulatedly connected between upper U-shaped lug plate 5.1, and upper U-shaped lug plate 5.1 clamping spring shock absorber 2's upper end joint prevents left and right shaking of the upper end of spring shock absorber 2.

[0043] The lower articulation device 7 comprises a lower U-shaped lug plate 7.1 fixedly welded / integrally connected at the top of the rear axle 8, and a lower bolt assembly 7.2, the lower end joint of the spring shock absorber 2 is inserted into the U-shaped opening of the lower U-shaped lug plate 7.1, and the lower bolt assembly 7.2 is connected and fixed across the lower U-shaped lug plate 7.1 and the lower end joint of the spring shock absorber 2 (that is, a through hole is formed in the lower U-shaped lug plate 7.1 and the lower end joint of the spring shock absorber 2, and the lower bolt assembly 7.2 passes through the through hole and is fixedly connected by the bolt rod and the nut of the lower bolt assembly 7.2), and the lower end joint of the spring shock absorber 2 is hingedly connected with the lower U-shaped lug plate 7.1. The lower U-shaped lug plate 7.1 clamps the lower end joint of the spring shock absorber 2 to prevent the lower end of the spring shock absorber 2 from shaking left and right.

[0044] The rear vertical rod 11, the rear axle 8 and the spring shock absorber 2 form a triangular layout, which is more stable according to the principle of engineering mechanics.

[0045] The forward inclination angle of the spring shock absorber 2 is 15° to 75°, and is preferably 30° to 45°.

[0046] Embodiment Two

[0047] As shown in Figures 7-12 A wheelchair rear wheel damping device, other features are the same as embodiment one, the difference is:

[0048] The large-wheel wheelchair rear wheel 3 has a large diameter, and the structure of the embodiment is mainly suitable for use of the large-wheel wheelchair rear wheel 3. The middle articulation device 6 is to be installed at a proper position of the rear vertical rod 11, and the upper articulation device 5 is to be installed at a proper position of the upper cross rod 10. The middle articulation device 6 comprises a stud connecting short rod 6.5, a rear articulation stud 6.2, a screw rod assembly 6.3 and a U-shaped lug joint 6.4 fixedly and integrally connected at the front end of the rear axle 8. The rear vertical rod 11, the stud connecting short rod 6.5 and the rear articulation stud 6.2 are made of metal. The stud connecting short rod 6.5 is welded at the middle section of the rear vertical rod 11. The stud connecting short rod 6.5 is arranged rearward. The rear articulation stud 6.2 is fixedly welded / integrally connected at the rear end of the stud connecting short rod 6.5.

[0049] The upper articulation device 5 comprises an upper U-shaped lug plate 5.1 and an upper bolt assembly 5.2. The upper U-shaped lug plate 5.1 is fixedly welded / integrally connected at the bottom of the rear section of the upper cross rod 10.

[0050] The rear section of the upper cross rod 10 is a section behind the connecting point of the rear vertical rod 11 and the upper cross rod 10.

[0051] When the wheelchair rear wheel diameter is larger, this design can be used flexibly.

Claims

1. A wheelchair rear wheel damping device, comprising a side frame body (1), a spring damper (2), a wheelchair rear wheel (3), a wheel shaft core (4) connected in the middle of the wheelchair rear wheel (3), and the spring damper (2) is inclined forward, and the upper end joint is connected to the upper rear part of the side frame body (1) through upper hinge device (5), characterized in that: The rear lower section of the side frame body (1) is hinged with a rear axle rod (8) arranged backward through a middle hinge device (6), the lower end joint of the spring shock absorber (2) is connected with the rear axle rod (8) through a lower hinge device (7), the rear axle rod (8) is provided with an axle through hole (9), and the axle core (4) penetrates through the axle through hole (9) and is fixedly connected.

2. The wheelchair rear wheel shock absorbing device of claim 1, wherein: The rear axle rod (8) and the side frame body (1) are arranged in the same axial direction; the rear axle rod (8) is horizontally arranged; the lower end of the spring shock absorber (2) is below the axle through hole (9), and the lower end of the spring shock absorber (2) and the axle through hole (9) are kept in the same vertical line.

3. The wheelchair rear wheel shock absorbing device according to claim 1 or 2, characterized in that: The side frame body (1) comprises an upper cross rod (10) and a rear vertical rod (11), the rear section of the upper cross rod (10) is fixedly connected with the rear vertical rod (11); the middle hinge device (6) comprises a rear elbow (6.1), a rear hinge stud (6.2), a screw rod assembly (6.3) and a U-shaped lug joint (6.4) fixedly connected with the front end of the rear axle rod (8), the rear elbow (6.1) is connected with the bottom end of the rear vertical rod (11) and is integrally formed by the bottom end of the rear vertical rod (11) extending backward; the rear hinge stud (6.2) is fixedly connected with the rear end of the rear elbow (6.1) in the transverse direction, the rear hinge stud (6.2) is inserted into the U-shaped mouth of the U-shaped lug joint (6.4), the screw rod assembly (6.3) penetrates through the right side of the U-shaped lug joint (6.4), the rear hinge stud (6.2), the left side of the U-shaped lug joint (6.4) and is fixedly connected by a nut.

4. The wheelchair rear wheel shock absorbing device of claim 3, wherein: The left and right ends of the rear hinge stud (6.2) have a wider cross section; the left and right sides of the U-shaped lug joint (6.4) are lug plates, and the left and right sides of the lug plates clamp the rear hinge stud (6.2) with a wider cross section at the left and right ends.

5. The wheelchair rear wheel shock absorbing device of claim 3, wherein: The upper hinge device (5) comprises an upper U-shaped lug plate (5.1) and an upper bolt assembly (5.2), the upper U-shaped lug plate (5.1) is fixedly connected with the rear part of the middle section of the rear vertical rod (11); the upper end joint of the spring shock absorber (2) is inserted into the U-shaped mouth of the upper U-shaped lug plate (5.1), the upper bolt assembly (5.2) penetrates through the upper U-shaped lug plate (5.1) and the upper end joint of the spring shock absorber (2) and is fixedly connected, and the upper end joint of the spring shock absorber (2) and the upper U-shaped lug plate (5.1) are hingedly connected; The lower hinge device (7) comprises a lower U-shaped lug plate (7.1) and a lower bolt assembly (7.2), the lower U-shaped lug plate (7.1) is fixedly connected with the top of the rear axle rod (8); the lower end joint of the spring shock absorber (2) is inserted into the U-shaped mouth of the lower U-shaped lug plate (7.1), the lower bolt assembly (7.2) penetrates through the lower U-shaped lug plate (7.1) and the lower end joint of the spring shock absorber (2) and is fixedly connected, and the lower end joint of the spring shock absorber (2) and the lower U-shaped lug plate (7.1) are hingedly connected; The rear vertical rod (11), the rear axle rod (8) and the spring shock absorber (2) form a triangular layout.

6. The wheelchair rear wheel shock absorbing device as set forth in claim 1 or 2, characterized by: The side frame body (1) comprises an upper cross rod (10) and a rear vertical rod (11), the rear section of the upper cross rod (10) is fixedly connected with the rear vertical rod (11); the middle hinge device (6) comprises a stud connecting short rod (6.5), a rear hinge stud (6.2), a screw rod assembly (6.3) and a U-shaped lug joint (6.4) fixedly connected with the front end of the rear axle rod (8), the front end of the stud connecting short rod (6.5) is connected with the middle section of the rear vertical rod (11), the stud connecting short rod (6.5) is arranged rearward, the rear hinge stud (6.2) is fixedly connected with the rear end of the stud connecting short rod (6.5) in a transverse manner, the rear hinge stud (6.2) is inserted into the U-shaped mouth of the U-shaped lug joint (6.4); the screw rod assembly (6.3) passes through the right side of the U-shaped lug joint (6.4), the rear hinge stud (6.2), the left side of the U-shaped lug joint (6.4) and is fixedly connected by a nut.

7. The wheelchair rear wheel shock absorbing device of claim 6, wherein: The left and right ends of the rear hinge stud (6.2) have a wider cross section; the left and right sides of the U-shaped lug joint (6.4) are lug plates, and the left and right sides of the lug plates clamp the rear hinge stud (6.2) with wider cross sections at the left and right ends.

8. The wheelchair rear wheel shock absorbing device of claim 6, wherein: The rear section of the upper cross rod (10) is a section behind the connecting point of the rear vertical rod (11) and the upper cross rod (10).

9. The wheelchair rear wheel shock absorbing device of claim 6, wherein: The upper hinge device (5) comprises an upper U-shaped lug plate (5.1) and an upper bolt assembly (5.2), the upper U-shaped lug plate (5.1) is fixedly connected with the rear section of the upper cross rod (10); the upper end joint of the spring shock absorber (2) is inserted into the U-shaped mouth of the upper U-shaped lug plate (5.1), the upper bolt assembly (5.2) passes through the upper U-shaped lug plate (5.1) and the upper end joint of the spring shock absorber (2) and is fixedly connected, and the upper end joint of the spring shock absorber (2) is hingedly connected with the upper U-shaped lug plate (5.1); The lower hinge device (7) comprises a lower U-shaped lug plate (7.1) and a lower bolt assembly (7.2), the lower U-shaped lug plate (7.1) is fixedly connected with the top of the rear axle rod (8); the lower end joint of the spring shock absorber (2) is inserted into the U-shaped mouth of the lower U-shaped lug plate (7.1), the lower bolt assembly (7.2) passes through the lower U-shaped lug plate (7.1) and the lower end joint of the spring shock absorber (2) and is fixedly connected, and the lower end joint of the spring shock absorber (2) is hingedly connected with the lower U-shaped lug plate (7.1); The rear vertical rod (11), the rear axle rod (8) and the spring shock absorber (2) form a triangular layout.

10. The wheelchair rear wheel shock absorbing device of claim 1 or 2, wherein: The forward inclination angle of the spring shock absorber (2) is 15° to 75°.

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