Wheelchair front wheel structure

Abstract

The utility model discloses a wheelchair front wheel structure which comprises a fixing frame, rotating seats are arranged at the two ends of the lower surface of the fixing frame, supporting arms are rotationally connected to the two ends of the lower surface of the fixing frame through the rotating seats, driving motors are installed at the bottoms of the supporting arms, and the power output ends of the driving motors are connected with gear boxes. The front wheel structure comprises a front wheel and a rear wheel, the front wheel is provided with a gear box, the power output end of the gear box penetrates through the cavity wall of the supporting arm, the power output end of the gear box is in transmission connection with a triangular arm, and a climbing wheel is rotationally arranged on the triangular arm. The electric telescopic rod stretches out, the front portion of the wheelchair can be jacked up through the lifting wheel, the wheelchair can conveniently pass through a barrier-free crossing, meanwhile, when the wheelchair moves, two sets of climbing wheels make contact with the ground all the time, friction force between the wheelchair and the ground is increased, enough steering force can be obtained when the wheelchair steers, pointing is more accurate, and control is more sensitive.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical equipment, and in particular relates to a front wheel structure of a wheelchair. Background Art

[0002] A wheelchair is a chair with wheels that can help replace walking. It is an important means of transportation for the injured, sick, and disabled to recover at home, be transported around, see a doctor, and go out for activities. Wheelchairs not only meet the needs of the physically disabled and those with limited mobility, but more importantly, they facilitate family members to move and take care of patients, allowing patients to exercise and participate in social activities with the help of wheelchairs. Electric wheelchairs are upgraded from traditional manual wheelchairs by adding high-performance power drive devices, intelligent control devices, batteries, and other components.

[0003] The front wheels of existing electric wheelchairs are steering wheels with a small diameter. When the electric wheelchair passes through barrier-free crossings or other road conditions, the small-sized front wheels will not be able to pass through high curbs or obstacles. Utility Model Content

[0004] The utility model aims to solve the shortcomings in the prior art and proposes a wheelchair front wheel structure.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A wheelchair front wheel structure is designed, comprising a fixed frame, wherein two ends of the lower surface of the fixed frame are provided with rotating seats, and the two ends of the lower surface of the fixed frame are rotatably connected to a support arm through the rotating seats, a driving motor is installed at the bottom of the support arm, and the power output end of the driving motor is connected to a gear box, and the power output end of the gear box penetrates the cavity wall of the support arm, and the power output end of the gear box is transmission-connected to a triangular arm, and a climbing wheel is rotatably provided on the triangular arm;

[0007] An electric telescopic rod is installed in the middle of the fixing frame, and a lifting wheel is rotatably connected to the piston rod end of the electric telescopic rod.

[0008] Preferably, the fixing frame is in a T-shaped structure, and the electric telescopic rod is installed on a cross arm of the fixing frame.

[0009] Preferably, a driving shaft is rotatably provided on the upper surface of the fixing frame through a bracket, and both ends of the driving shaft are fixedly connected with a worm.

[0010] Preferably, the surface of the worm is drivingly connected with a worm wheel, the bottom of the worm wheel is welded with a transmission rod, and the bottom of the transmission rod passes through the cavity wall of the fixed frame and is connected with the top of the support arm.

[0011] Preferably, a steering motor is installed in the middle of the upper surface of the fixing frame, and a driving gear is connected to the power output end of the steering motor.

[0012] Preferably, a driven gear is installed in the middle of the driving shaft, and the driving gear is meshed and connected with the driven gear.

[0013] The utility model provides a wheelchair front wheel structure, which has the following beneficial effects:

[0014] 1. In this new type, the driving motor drives the triangular arm through the gear box. When the triangular arm rotates, the climbing wheels can alternately contact the ground, which can simulate the human body taking steps forward. When encountering a higher barrier-free crossing, the electric telescopic rod can be extended to lift the front of the wheelchair through the lifting wheel, and the climbing wheel will fall after passing the curb, so that the wheelchair can have a climbing function when moving forward, and can easily pass through the barrier-free crossing.

[0015] 2. In this new model, the steering motor drives the worm wheel through the worm, and the worm wheel drives the supporting arm to rotate under the cooperation of the rotating seat through the transmission rod, so as to control the steering of the wheelchair. The worm wheel and the worm have a self-locking function, which can improve the stability of the climbing wheels and avoid the climbing wheels from swinging under the influence of the road surface on rugged roads. At the same time, there are three groups of climbing wheels and they are rotatably installed on the triangular arm. When the wheelchair moves, there are always two groups of climbing wheels in contact with the ground, which increases the friction with the ground, so that the wheelchair can obtain sufficient steering force when turning, and the pointing is more precise and the control is more sensitive. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of a wheelchair front wheel structure proposed by the utility model;

[0017] Figure 2 A schematic diagram of the steering drive structure of a wheelchair front wheel structure proposed by the utility model;

[0018] Figure 3 A schematic diagram of a triangular arm driving structure of a wheelchair front wheel structure proposed by the utility model;

[0019] Figure 4 This is a front view structural schematic diagram of a wheelchair front wheel structure proposed by the utility model.

[0020] In the figure: 1. fixed frame; 2. rotating seat; 3. supporting arm; 4. driving motor; 5. gear box; 6. triangular arm; 7. climbing wheel; 8. electric telescopic rod; 9. lifting wheel; 10. driving shaft; 11. worm; 12. worm wheel; 13. driven gear; 14. steering motor; 15. driving gear. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0022] Reference Figure 1-4 A wheelchair front wheel structure, comprising a fixing frame 1, wherein two ends of the lower surface of the fixing frame 1 are provided with a rotating seat 2, and two ends of the lower surface of the fixing frame 1 are rotatably connected to a support arm 3 through the rotating seat 2, a driving motor 4 is installed at the bottom of the support arm 3, and a gear box 5 is connected to the power output end of the driving motor 4, and the power output end of the gear box 5 passes through the cavity wall of the support arm 3, and the power output end of the gear box 5 is transmission-connected to a triangular arm 6, and a climbing wheel 7 is rotatably provided on the triangular arm 6;

[0023] An electric telescopic rod 8 is installed in the middle of the fixing frame 1 , and a lifting wheel 9 is rotatably connected to the piston rod end of the electric telescopic rod 8 . The fixing frame 1 is in a T-shaped structure, and the electric telescopic rod 8 is installed on the cross arm of the fixing frame 1 .

[0024] It should be noted that the driving motor 4 drives the triangular arm 6 through the gear box 5. When the triangular arm 6 rotates, the climbing wheel 7 can alternately contact the ground, which can simulate a human body taking steps forward. When encountering a higher barrier-free crossing, the electric telescopic rod 8 can be extended to lift the front of the wheelchair through the lifting wheel 9, and the climbing wheel 7 will fall after passing the curb, so that the wheelchair can have a climbing function when moving forward, and can easily pass through the barrier-free crossing.

[0025] like Figure 2 and Figure 3 As shown, a driving shaft 10 is rotatably provided on the upper surface of the fixed frame 1 through a bracket, and worms 11 are fixedly connected at both ends of the driving shaft 10. A worm wheel 12 is drivingly connected to the surface of the worm 11. A driving rod is welded to the bottom of the worm wheel 12. The bottom of the driving rod passes through the cavity wall of the fixed frame 1 and is connected to the top of the support arm 3. A steering motor 14 is installed in the middle of the upper surface of the fixed frame 1. A driving gear 15 is connected to the power output end of the steering motor 14. A driven gear 13 is installed in the middle of the driving shaft 10, and the driving gear 15 is meshed and connected with the driven gear 13.

[0026] It should be noted that the steering motor 14 drives the worm wheel 12 through the worm 11, and the worm wheel 12 drives the support arm 3 to rotate under the cooperation of the rotating seat 2 through the transmission rod, so as to control the steering of the wheelchair. The worm wheel 12 and the worm 11 have a self-locking function, which can improve the stability of the climbing wheel 7 and prevent the climbing wheel 7 from swinging under the influence of the road surface on rugged roads. At the same time, there are three groups of climbing wheels 7 and they are rotatably installed on the triangular arm 6. When the wheelchair moves, there are always two groups of climbing wheels 7 in contact with the ground, which increases the friction with the ground and enables the wheelchair to obtain sufficient steering force when turning, so that the pointing is more precise and the control is more sensitive.

[0027] Working principle: When in use, the climbing wheel 7 is installed at the wheelchair steering wheel installation position through the fixing frame 1, the steering motor 14 drives the worm wheel 12 through the worm 11, and the worm wheel 12 drives the support arm 3 to rotate under the cooperation of the rotating seat 2 through the transmission rod, so as to control the steering of the wheelchair. The worm wheel 12 and the worm 11 are matched with a self-locking function, which can improve the stability of the climbing wheel 7 and prevent the climbing wheel 7 from swinging under the influence of the road surface on a rugged road. At the same time, there are three sets of climbing wheels 7 and they are rotatably installed on the triangular arm 6. When the wheelchair moves, there are always two sets of climbing wheels 7. The climbing wheels 7 are in contact with the ground, increasing the friction with the ground, so that the wheelchair can obtain sufficient steering force when turning, with more precise pointing and more sensitive control. The driving motor 4 drives the triangular arm 6 through the gear box 5. When the triangular arm 6 rotates, the climbing wheels 7 can alternately contact the ground, which can simulate the human body taking steps forward. When encountering a higher barrier-free crossing, the electric telescopic rod 8 is extended to lift the front of the wheelchair through the lifting wheel 9, and the climbing wheel 7 falls after passing the curb, so that the wheelchair has a climbing function when moving forward, and can easily pass through the barrier-free crossing.

[0028] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A wheelchair front wheel structure, comprising a fixing frame (1), characterized in that: Rotating seats (2) are provided at both ends of the lower surface of the fixing frame (1), and the two ends of the lower surface of the fixing frame (1) are rotatably connected to a support arm (3) through the rotating seats (2). A driving motor (4) is installed at the bottom of the support arm (3), and the power output end of the driving motor (4) is connected to a gear box (5). The power output end of the gear box (5) penetrates the cavity wall of the support arm (3), and the power output end of the gear box (5) is drivingly connected to a triangular arm (6), and a climbing wheel (7) is rotatably provided on the triangular arm (6); An electric telescopic rod (8) is installed in the middle of the fixing frame (1), and a lifting wheel (9) is rotatably connected to the piston rod end of the electric telescopic rod (8).

2. A wheelchair front wheel structure according to claim 1, characterized in that: The fixing frame (1) is in a T-shaped structure, and the electric telescopic rod (8) is mounted on a cross arm of the fixing frame (1).

3. A wheelchair front wheel structure according to claim 2, characterized in that: A driving shaft (10) is rotatably provided on the upper surface of the fixing frame (1) through a bracket, and both ends of the driving shaft (10) are fixedly connected to a worm (11).

4. A wheelchair front wheel structure according to claim 3, characterized in that: The surface of the worm (11) is drivingly connected to a worm wheel (12), the bottom of the worm wheel (12) is welded with a transmission rod, and the bottom of the transmission rod passes through the cavity wall of the fixed frame (1) and is connected to the top of the support arm (3).

5. A wheelchair front wheel structure according to claim 4, characterized in that: A steering motor (14) is installed in the middle of the upper surface of the fixing frame (1), and a driving gear (15) is connected to the power output end of the steering motor (14).

6. A wheelchair front wheel structure according to claim 5, characterized in that: A driven gear (13) is installed in the middle of the driving shaft (10), and the driving gear (15) is meshed and connected with the driven gear (13).

Images