An electric wheelchair

Abstract

This invention relates to the technical field of mobility tools and discloses an electric wheelchair, including a controller, a seat, front wheels, rear wheels, and a support transmission assembly. The support transmission assembly includes a base bracket, a main support frame, a front connecting rod, and a rear drive push rod. The front connecting rod and the rear drive push rod are arranged sequentially in a front-rear direction. The upper end of the main support frame is rotatably connected to the seat, and the lower end is connected to the front wheels. The front end of the base bracket is rotatably connected to the lower end of the main support frame, and the rear end is connected to the rear wheels. The two ends of the front connecting rod are respectively connected to the seat and the lower end of the main support frame. The two ends of the rear drive push rod are rotatably connected to the upper end of the main support frame and the base bracket, respectively. The seat is equipped with an angle sensor, and the controller is electrically connected to the angle sensor, the front connecting rod, and the rear drive push rod. This electric wheelchair improves safety when going up and down slopes and meets the user's need to reach items at high places.

Description

Technical Field

[0001] This invention relates to the technical field of transportation tools, and in particular to an electric wheelchair. Background Technology

[0002] Currently, common electric wheelchairs simply add power to traditional wheelchairs, driving the rear wheels forward and backward. However, the instability problem of traditional wheelchairs on inclines and declines remains unresolved. When going up or down slopes, the seat tilts, causing a shift in the wheelchair's center of gravity and increasing the risk of falls. Furthermore, existing wheelchairs can only be raised and lowered from their initial position (sitting height) or below, which is insufficient for users with leg disabilities to reach items at higher places. Summary of the Invention

[0003] With the aim of at least solving one of the technical problems existing in the prior art, the purpose of this invention is to provide an electric wheelchair that automatically adjusts the center of gravity forward and backward according to the slope and maintains the seat angle unchanged, thereby improving support stability and safety of use, and allowing users to ride comfortably and safely when going up and down slopes as if riding on flat ground.

[0004] To achieve the above objectives, the present invention provides an electric wheelchair, including a controller, a seat, front wheels, rear wheels, and a support transmission assembly;

[0005] The support transmission assembly includes a base bracket, a main support frame, a front connecting rod, and a rear drive push rod. The front connecting rod and the rear drive push rod are arranged sequentially in the front-rear direction. The upper end of the main support frame is rotatably connected to the seat, and the lower end is connected to the front wheel. The front end of the base bracket is rotatably connected to the lower end of the main support frame, and the rear end is connected to the rear wheel. The two ends of the front connecting rod are respectively connected to the seat and the lower end of the main support frame. The two ends of the rear drive push rod are rotatably connected to the upper end of the main support frame and the base bracket, respectively.

[0006] The seat is equipped with an angle sensor, and the controller is electrically connected to the angle sensor, the front connecting rod, and the rear drive push rod.

[0007] As a preferred embodiment, the seat includes a transmission base and a seat cushion. The transmission base is fixed to the rear of the seat cushion, the front connecting rod is rotatably connected to the front end of the transmission base, the upper end of the main support frame is rotatably connected to the rear end of the transmission base, and the angle sensor is fixed to the transmission base or the seat cushion.

[0008] As a preferred embodiment, the rear wheel includes a driving component and a rear wheel body, the driving component being connected to the rear wheel in a transmission manner, and the rear wheel body being rotatably connected to the base bracket.

[0009] As a preferred embodiment, the base bracket includes a lower connecting rod and a support connecting rod. There are at least two lower connecting rods. The support connecting rod is connected between the two lower connecting rods. The front ends of the two lower connecting rods are rotatably connected to the two sides of the main support frame, respectively. The lower end of the rear drive push rod and the rear wheel are rotatably connected to the support connecting rod.

[0010] As a preferred embodiment, the support link includes a middle link and a rear link. The rear wheel is rotatably connected to the rear link. The rear ends of the two lower links are respectively fixedly connected to the two ends of the rear link in the width direction. The middle link is located in front of the rear link and is connected between the two lower links. The lower end of the rear drive push rod is rotatably connected to the middle link.

[0011] As a preferred embodiment, the rear wheel includes an upper bracket, a lower base plate, a rear wheel body, and a buffer component. One end of the lower base plate is rotatably connected to the rear connecting rod, and the other end of the lower base plate is connected to the rear wheel body and the lower end of the buffer component. The upper end of the buffer component is connected to the upper bracket, and the upper bracket is connected to the rear end of the lower connecting rod.

[0012] As a preferred embodiment, the lower connecting rod includes a flat section and an inclined section, the front end of the flat section is connected to the lower end of the inclined section, and the upper end of the inclined section is connected to the lower end of the main support frame.

[0013] As a preferred embodiment, the main support frame includes an upper end rod, a lower end rod, and a main side rod. The upper end rod and the lower end rod extend along the width direction, and the two ends of the upper end rod and the lower end rod are respectively connected to the main side rod. The upper end rod, the lower end rod, and the main side rod are interconnected to form a closed frame structure. The upper end of the rear drive push rod is rotatably connected to the upper end rod, the lower end of the front connecting rod is rotatably connected to the lower end rod, and the front end of the lower side connecting rod is rotatably connected to the main side rod.

[0014] As a preferred embodiment, the front wheel includes a front wheel body and a pedal, the pedal being rotatably connected to the front wheel body at both ends in the width direction, and the rear end of the pedal being connected to the main support frame.

[0015] As a preferred embodiment, the front wheel body is an omnidirectional wheel.

[0016] As a preferred embodiment, the support transmission assembly includes a flat ground walking state, an uphill state, and a downhill state. When the support transmission assembly moves from the flat ground walking state to the uphill state, the rear drive push rod extends; when the support transmission assembly moves from the flat ground walking state to the downhill state, the rear drive push rod shortens.

[0017] As a preferred embodiment, the support transmission assembly includes a lifting state and a folding state. When the support transmission assembly moves from the flat ground walking state to the lifting state, the rear drive push rod and the front connecting rod extend respectively; when the support transmission assembly moves from the flat ground walking state to the folding state, the rear drive push rod and the front connecting rod shorten respectively.

[0018] Compared with existing technologies, the electric wheelchair of this invention has the following advantages: When the user sits on the seat, the front wheels are rotatably connected to the rear end of the base bracket, and the rear wheels are rotatably connected to the front end of the main support frame, thus meeting the wheelchair's mobility requirements. The support transmission assembly is used to support the seat and change its angle and height. When the seat tilts uphill or downhill, an angle sensor is connected to it. This sensor acquires information about the seat's angle changes and sends this information to a controller. The controller then controls the front connecting rod and / or the rear drive push rod to extend and retract, thereby changing the seat's angle and height. Specifically, the support and transmission assembly includes a base bracket, a main support frame, a front connecting rod, and a rear drive push rod. The lower end of the front connecting rod is rotatably connected to the lower end of the main support frame, and the upper end of the front connecting rod is rotatably connected to the seat. The upper end of the main support frame is rotatably connected to the seat, and the upper end of the front connecting rod is located in front of the upper end of the main support frame. The front connecting rod, the seat, and the main support frame form an inverted triangular support structure. The front end of the base bracket is rotatably connected to the lower end of the main support frame. The upper end of the rear drive push rod is rotatably connected to the upper end of the main support frame, and the lower end of the rear drive push rod is rotatably connected to the base bracket. The lower end of the rear drive push rod is located behind the lower end of the main support frame. The rear drive push rod, the main support frame, and the base bracket form a triangular support structure. When walking on a flat surface, the seat is simultaneously supported by the inverted triangular support structure and the double triangular support structure, resulting in strong structural stability. When the seat is going uphill, the controller extends the rear drive push rod to compensate for the seat's angle, moving the seat forward to adjust its center of gravity and maintain a parallel or nearly parallel position to the ground, while the length of the front connecting rod remains unchanged. When the seat is going downhill, the controller shortens the rear drive push rod to compensate for the seat's angle, moving the seat backward to maintain a parallel or nearly parallel position to the ground, while the length of the front connecting rod remains unchanged. During the uphill or downhill process, the rear drive push rod adjusts its length to compensate for the seat's angle; only the triangular support structure changes, while the inverted triangular support structure remains constant to ensure the seat's support stability during angle compensation. Therefore, the support transmission assembly forms a double-triangular structure, achieving seat angle compensation during uphill and downhill movements and ensuring the seat's support stability. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention.

[0020] Figure 2 This is a rear view of the overall structure of an embodiment of the present invention.

[0021] Figure 3 This is a front view of the overall structure of an embodiment of the present invention.

[0022] Figure 4 This is a schematic diagram of the connection structure between the support transmission component and the transmission base in an embodiment of the present invention.

[0023] Figure 5 This is a schematic diagram of the main support frame in an embodiment of the present invention.

[0024] Figure 6 This is a schematic diagram of the base support structure according to an embodiment of the present invention.

[0025] Figure 7 This is a schematic diagram of the rear wheel structure in an embodiment of the present invention.

[0026] Figure 8 This is a schematic diagram of the overall structure of the present invention in an uphill state.

[0027] Figure 9 This is a schematic diagram of the overall structure of the embodiment of the present invention in a downhill state.

[0028] Figure 10 This is a schematic diagram of the overall structure of the present invention in the lifted state.

[0029] Figure 11 This is a schematic diagram of the overall structure of an embodiment of the present invention in a folded state.

[0030] In the picture:

[0031] 10. Seat; 11. Angle sensor; 12. Transmission base; 13. Seat cushion;

[0032] 20. Front wheel; 21. Front wheel assembly; 22. Pedal;

[0033] 30. Rear wheel; 31. Drive unit; 32. Rear wheel body; 33. Upper bracket; 34. Lower base plate; 35. Buffer component;

[0034] 40. Support transmission assembly; 41. Base bracket; 42. Lower side connecting rod; 421. Smooth section; 422. Inclined section; 43. Middle connecting rod; 44. Rear connecting rod; 45. Main support frame; 46. Upper end rod; 47. Lower end rod; 48. Main side rod; 49. Front connecting rod; 50. Rear drive push rod; 51. Support connecting rod. Detailed Implementation

[0035] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0036] In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" used to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to 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 invention.

[0037] In the description of this invention, it should be understood that the terms "connected," "linked," and "fixed," etc., used in this invention should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or a welded connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly defined. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0038] It should be noted that in this case, the front-back direction is the direction of travel of the wheelchair, and the direction perpendicular to the direction of travel of the wheelchair and the left and right hands of the user sitting in the seat is the width direction.

[0039] like Figures 1 to 10 As shown, an electric wheelchair according to a preferred embodiment of the present invention includes a controller, a seat 10, a front wheel 20, a rear wheel 30, and a support transmission assembly 40.

[0040] The support transmission assembly 40 includes a base bracket 41, a main support frame 45, a front connecting rod 49, and a rear drive push rod 50. The front connecting rod 49 and the rear drive push rod 50 are arranged sequentially in the front-rear direction. The upper end of the main support frame 45 is rotatably connected to the seat 10, and the lower end is connected to the front wheel 20. The front end of the base bracket 41 is rotatably connected to the lower end of the main support frame 45, and the rear end is connected to the rear wheel 30. The two ends of the front connecting rod 49 are respectively connected to the seat 10 and the lower end of the main support frame 45. The two ends of the rear drive push rod 50 are rotatably connected to the upper end of the main support frame 45 and the base bracket 41, respectively.

[0041] The seat 10 is equipped with an angle sensor 11, and the controller is electrically connected to the angle sensor 11, the front connecting rod 49 and the rear drive push rod 50 respectively.

[0042] In the electric wheelchair of this invention, the user sits on the seat 10, the front wheels 20 are rotatably connected to the rear end of the base bracket 41, and the rear wheels 30 are rotatably connected to the front end of the main support frame 45 to meet the needs of wheelchair movement. The support transmission assembly 40 is used to support the seat 10 and change the angle and height of the seat 10. When the seat 10 tilts uphill or downhill, an angle sensor 11 is connected to the seat 10. The angle sensor 11 acquires the angle change information of the seat 10 and sends the angle change information to the controller. The controller controls the front connecting rod 49 and / or the rear drive push rod 50 to extend and retract to change the angle and height of the seat 10. Specifically, the support transmission assembly 40 includes a base bracket 41, a main support frame 45, a front connecting rod 49, and a rear drive push rod 50. The lower end of the front connecting rod 49 is rotatably connected to the lower end of the main support frame 45, and the upper end of the front connecting rod 49 is rotatably connected to the seat 10. The upper end of the main support frame 45 is rotatably connected to the seat 10, and the upper end of the front connecting rod 49 is located in front of the upper end of the main support frame 45. Figure 4 As shown, the front connecting rod 49, seat 10, and main support frame 45 form an inverted triangular support structure. The front end of the base bracket 41 is rotatably connected to the lower end of the main support frame 45, the upper end of the rear drive push rod 50 is rotatably connected to the upper end of the main support frame 45, and the lower end of the rear drive push rod 50 is rotatably connected to the base bracket 41. The lower end of the rear drive push rod 50 is located behind the lower end of the main support frame 45. Figure 4 As shown, the rear drive push rod 50, main support frame 45, and base bracket 41 form a triangular support structure. When walking on flat ground, the seat 10 is simultaneously supported by the inverted triangular support structure and the double triangular support structure, resulting in strong structural stability. When the seat 10 is going uphill, the controller controls the rear drive push rod 50 to extend and compensate for the angle of the seat 10, causing the seat 10 to move forward to adjust its center of gravity and maintain a parallel or nearly parallel state with the ground, while the length of the front connecting rod 49 remains unchanged. When the seat 10 is going downhill, the controller controls the rear drive push rod 50 to shorten and compensate for the angle of the seat 10, causing the seat 10 to move backward and maintain a parallel or nearly parallel state with the ground, while the length of the front connecting rod 49 remains unchanged. During the uphill or downhill process of the seat 10, the length of the rear drive push rod 50 is adjusted to achieve angle compensation for the seat 10. Only the triangular support structure changes, while the inverted triangular support structure remains unchanged to ensure the support stability of the seat 10 during the angle compensation process. Therefore, as Figures 1 to 4 As shown, the support transmission assembly 40 forms a double triangular structure, which compensates for the angle of the seat 10 during the process of going up and down slopes, and ensures the support stability of the seat 10.

[0043] As one embodiment, the total length of the front connecting rod 49 remains unchanged, making the overall structure of the support transmission assembly 40 simpler and reducing production costs.

[0044] As one embodiment, such as Figure 1 and Figure 4 As shown, the main support frame 45, the front connecting rod 49, and the rear drive push rod 50 are respectively tilted backward. Under the premise that the front connecting rod 49 and the rear drive push rod 50 are of the same model, the range of motion of the support transmission assembly 40 in the front-back direction and the height direction can be increased, that is, the compensation range of the seat 10 angle and the lifting height of the seat 10 can be increased, which can meet the usage requirements of greater slope and the range of height access.

[0045] Furthermore, such as Figures 1 to 3 As shown, the seat 10 includes a transmission base 12 and a seat cushion 13. The transmission base 12 is fixed to the rear of the seat cushion 13. A front connecting rod 49 is rotatably connected to the front end of the transmission base 12. The upper end of the main support frame 45 is rotatably connected to the rear end of the transmission base 12. An angle sensor 11 is fixed to either the transmission base 12 or the seat cushion 13. The seat cushion 13 is fixedly connected to the transmission base 12, and the angle sensor 11 is fixed to either the seat cushion 13 or the transmission base 12, keeping the relative position of the angle sensor 11 and the seat cushion 13 unchanged. The front connecting rod 49 is rotatably connected to the front end of the transmission base 12, and the main support frame 45 is rotatably connected to the rear end of the transmission base 12. The transmission base 12 provides installation space for the front drive rod and the main support frame 45. At the same time, the transmission base 12, the main support frame 45, and the front connecting rod 49 form an inverted triangular support structure. The transmission base 12 is fixed to the rear of the seat cushion 13, causing the center of gravity of the seat cushion 13 to be biased towards the rear of the wheelchair, improving the walking stability of the seat 10.

[0046] Furthermore, such as Figures 1 to 3 As shown, the rear wheel 30 includes a driving component 31 and a rear wheel body 32. The driving component 31 is connected to the rear wheel 30 in a transmission manner, and the rear wheel body 32 is rotatably connected to the base bracket 41. The driving component 31 drives the rear wheel body 32 to rotate. In this embodiment, the rear wheel body 32 acts as the driving wheel, and the front wheel body 21 acts as the driven wheel. The front wheel 20 is driven forward by the rear wheel 30. The main support frame 45, the front connecting rod 49, and the rear drive push rod 50 are respectively tilted backward, so that the center of gravity of the seat 10 is set backward, reducing the load on the front wheel 20 and the friction between the front wheel 20 and the ground. This reduces the resistance encountered by the front wheel 20 when turning, improves the wheelchair's handling efficiency and user experience, and when the driving component 31 pushes the front wheel body 21 forward, under the action of the rear driving force, the front wheel is more likely to climb upward when it is impacted, which helps to improve the wheelchair's obstacle crossing ability.

[0047] As one embodiment, such as Figures 1 to 3 As shown, rear wheels 30 are rotatably connected to both sides of the base bracket 41 to improve the stability of the wheelchair.

[0048] Furthermore, such as Figures 4 to 6 As shown, the base bracket 41 includes lower connecting rods 42 and support connecting rods 51. There are at least two lower connecting rods 42. The support connecting rods 51 are connected between the two lower connecting rods 42. The front ends of the two lower connecting rods 42 are rotatably connected to both sides of the main support frame 45. The lower end of the rear drive push rod 50 and the rear wheel 30 are rotatably connected to the support connecting rods 51. The front ends of the two lower connecting rods 42 are rotatably connected to both sides of the lower end of the main support frame 45. The support connecting rods 51 are connected between the two lower connecting rods 42 to form a bottom frame structure. The lower end of the rear drive push rod 50 is connected to the support connecting rods 51, and the upper end of the rear drive push rod 50 is connected to the upper end of the main support frame 45. The rear drive push rod 50 and the support connecting rods 51 form a T-shaped support structure for the main support frame 45, so that the rear drive push rod 50, the lower connecting rods 42 and the main support frame 45 form a triangular support structure. Based on the bottom frame structure, a T-shaped support structure and a triangular support structure are formed respectively, which improves the overall structural stability of the wheelchair.

[0049] Furthermore, such as Figures 4 to 6 As shown, the support link 51 includes a middle link 43 and a rear link 44 extending in the width direction. The rear wheel 30 is rotatably connected to the rear link 44. The rear ends of the two lower link 42 are fixedly connected to the two ends of the rear link 44 in the width direction. The middle link 43 is located in front of the rear link 44 and is connected between the two lower link 42. The lower end of the rear drive push rod 50 is rotatably connected to the middle link 43. The middle link 43 and the rear link 44 are respectively connected between the two lower links 42 to form the bottom frame structure. The lower end of the rear drive push rod 50 is rotatably connected to the middle link 43. The middle link 43 is located in front of the rear link 44. The rear drive push rod 50 and the middle link 43 form a rearward tilting T-shaped structure. Under the premise of the same model of rear drive push rod 50, the range of motion of the main support frame 45 in the front-rear direction and the height direction can be increased, that is, the compensation range of the seat 10 angle and the lifting height of the seat 10 can be increased, which can meet the requirements of use on larger slopes and the height range of access. At the same time, the rear wheel 30 is rotatably connected to the rear link 44. Since the rear wheel 30 generates a force in the height direction when walking over obstacles, it reduces the influence of the force in the height direction on the T-shaped support structure formed by the rear drive push rod 50 and the middle link 43, and improves the support stability of the T-shaped support structure.

[0050] Furthermore, such as Figure 7As shown, the rear wheel 30 includes an upper bracket 33, a lower base plate 34, a rear wheel body 32, and a buffer 35. One end of the lower base plate 34 is rotatably connected to the rear connecting rod 44 in the front-rear direction, and the other end of the lower base plate 34 is connected to the lower end of the rear wheel body 32 and the buffer 35, respectively. The upper end of the buffer 35 is connected to the upper bracket 33, and the upper bracket 33 is connected to the rear end of the lower connecting rod 42. The support transmission assembly 40 supports the seat 10, and the support transmission assembly 40 has a larger range of motion in the front-rear and height directions. The main support frame 45, the front connecting rod 49, and the rear drive push rod 50 are respectively tilted backward, so that the center of gravity of the seat 10 is more inclined to the rear end of the base bracket 41. The rear end of the base bracket 41 bears a greater supporting force, and the rear wheel 30 is connected to the rear end of the base bracket 41. When the rear wheel 30 crosses an obstacle, its height changes, and the rear wheel 30 exerts a force in the height direction on the rear end of the base bracket 41, making the rear end of the base bracket 41 prone to deformation. The upper bracket 33 is fixed to the rear end of the lower connecting rod 42. One end of the lower base plate 34 is rotatably connected to the rear connecting rod 44 in the front-rear direction. The rear wheel 32 is connected to the lower base plate 34, providing the rear wheel 30 with greater room for movement in the front-rear rotation angle and height direction, thus improving the obstacle-crossing ability of the rear wheel 32. At the same time, the lower base plate 34 and the upper bracket 33 are connected by a buffer 35, which reduces the force exerted by the rear wheel 30 on the rear connecting rod 44 and the lower connecting rod 42 in the height direction, preventing deformation of the rear connecting rod 44 in the width direction and deformation of the lower connecting rod 42 in the height direction, thereby improving the support stability of the base bracket 41. The buffer 35 is a prior art structure used to achieve the buffering effect.

[0051] Furthermore, such as Figure 7 As shown, the lower connecting rod 42 includes a smooth section 421 and an inclined section 422. The front end of the smooth section 421 is connected to the lower end of the inclined section 422, and the upper end of the inclined section 422 is connected to the lower end of the main support frame 45. Through the inclined section 422 connecting to the lower end of the main support frame 45, a portion of the force at the lower end of the main support frame 45 is transmitted along the inclined section to the smooth section 421 to disperse the force. The front wheel 20 is connected to the lower end of the main support frame 45, preventing force concentration and breakage at the connection between the main support frame 45 and the front wheel 20. Specifically, the rear end of the smooth section 421 is connected to one end of the rear connecting rod 44 in the width direction. As one embodiment, as... Figure 11 As shown, the inclined section 422 forms an angle α with the main support frame 45, and the angle α is set between 50° and 107°. As one embodiment, such as... Figure 11 As shown, the inclined section 422 and the gentle section 421 form an angle b, and the angle a is set at 138°-144°.

[0052] As one embodiment, such as Figure 4As shown, the middle connecting rod 43 is connected to the lower connecting rod 42 to form a connection point. The length from the connection point to the front end of the lower connecting rod 42 is 'a'. 1 / 5 of the total length of the lower connecting rod 42 ≤ a ≤ 1 / 3 of the total length of the lower connecting rod 42. The middle connecting rod 43 is located near the front end of the lower connecting rod 42, causing the rear drive push rod 50 to tilt backward. This shortens the distance between the middle connecting rod 43 and the main support frame 45 in the front-rear direction, making the bottom support force of the wheelchair more concentrated and improving the support stability of the wheelchair bottom during walking.

[0053] Furthermore, such as Figures 4 to 6 As shown, the main support frame 45 includes an upper end rod 46, a lower end rod 47, and a main side rod 48. The upper end rod 46 and the lower end rod 47 extend along the width direction. The two ends of the upper end rod 46 and the lower end rod 47 are respectively connected to the main side rod 48. The upper end rod 46, the lower end rod 47, and the two main side rods 48 are interconnected to form a closed frame structure. The upper end of the rear drive push rod 50 is rotatably connected to the upper end rod 46, the lower end of the front connecting rod 49 is rotatably connected to the lower end rod 47, and the front end of the lower side connecting rod 42 is rotatably connected to the main side rod 48. The upper rod 46, the lower rod 47, and the two main side rods 48 are connected to form a frame structure in the height direction, which improves the support strength of the seat 10 in the height direction. Based on the frame structure in the height direction, the lower end of the front connecting rod 49 is rotatably connected to the lower rod 47 to form a T-shaped support structure in the width direction, which improves the support stability of the seat 10 in the width direction. Based on the frame structure in the height direction, a T-shaped support structure and an inverted triangular structure formed by the front connecting rod 49, the main support frame 45, and the seat 10 are formed to improve the support stability of the front end of the wheelchair.

[0054] Furthermore, such as Figure 1 As shown, the front wheel 20 includes a front wheel body 21 and a pedal 22. The pedal 22 is rotatably connected to the front wheel body 21 at both ends in the width direction, and its rear end is connected to the main support frame. In one embodiment, the rear end of the pedal 22 is connected to a lower rod 47. The pedal 22 provides a footrest for the user, and the front wheel body 21 is rotatably connected to both sides of the pedal 22 in the width direction, improving the walking stability of the front wheel 20. The rear end of the pedal 22 is fixedly connected to the lower rod 47 to form a single unit, enhancing the overall connection between the support transmission assembly 40 and the front wheel 20, resulting in a more compact overall structure.

[0055] Furthermore, such as Figure 1 As shown, the front wheel 21 is an omnidirectional wheel. This makes lateral movement easier when the wheelchair is making side turns, and at the same time, it requires less driving force to achieve side turns, making it more maneuverable.

[0056] Furthermore, such as Figures 8 to 9As shown, the support transmission assembly 40 includes flat ground walking, uphill walking, and downhill walking modes. When the support transmission assembly 40 transitions from flat ground walking to uphill walking, the rear drive push rod 50 extends; when it transitions from flat ground walking to downhill walking, the rear drive push rod 50 shortens. In both uphill and downhill modes, the angle of the seat 10 can be compensated simply by extending the rear drive push rod 50 to adjust the support height of the main support frame 45 on the seat 10, ensuring that the seat 10 remains parallel or nearly parallel to the horizontal plane. The adjustment structure is simple and has low production costs. It should be noted that the uphill walking mode refers to the electric wheelchair tilting upwards relative to the horizontal direction, including but not limited to continuous or discontinuous uphill movements, such as climbing stairs. The downhill walking mode refers to the electric wheelchair tilting downwards relative to the horizontal direction, including but not limited to continuous or discontinuous downhill movements, such as descending stairs. The horizontal direction is perpendicular to the Earth's gravity.

[0057] Furthermore, the front connecting rod 49 is a telescopic drive push rod, meaning that both ends of the front connecting rod can extend and retract, allowing the length of the front connecting rod to be adjusted according to actual needs. When both the front connecting rod 49 and the rear drive push rod 50 extend simultaneously, the seat 10 is lifted to meet the user's need to retrieve items from higher places. When both the front connecting rod 49 and the rear drive push rod 50 retract simultaneously, the wheelchair can be folded to meet storage needs.

[0058] Furthermore, such as Figures 10 to 11 As shown, the support transmission assembly 40 includes a lifting state and a folding state. When the support transmission assembly 40 moves from the flat ground walking state to the lifting state, the rear drive push rod 50 and the front connecting rod 49 extend respectively; when the support transmission assembly 40 moves from the flat ground walking state to the folding state, the rear drive push rod 50 and the front connecting rod 49 shorten respectively. The support transmission assembly 40 can achieve uphill and downhill adjustment, as well as lifting and folding states, meeting more user needs.

[0059] In summary, this embodiment of the invention provides an electric wheelchair. A user sits on a seat 10, with the front wheels 20 rotatably connected to the rear end of the base bracket 41 and the rear wheels 30 rotatably connected to the front end of the main support frame 45, to meet the wheelchair's mobility requirements. The support transmission assembly 40 is used to support the seat 10 and change its angle and height. When the seat 10 tilts uphill or downhill, an angle sensor 11 is connected to the seat 10. The angle sensor 11 acquires information about the angle change of the seat 10 and sends this information to a controller. The controller then controls the front connecting rod 49 and / or the rear drive push rod 50 to extend and retract to change the angle and height of the seat 10. Specifically, the support transmission assembly 40 includes a base bracket 41, a main support frame 45, a front connecting rod 49, and a rear drive push rod 50. The lower end of the front connecting rod 49 is rotatably connected to the lower end of the main support frame 45, and the upper end of the front connecting rod 49 is rotatably connected to the seat 10. The upper end of the main support frame 45 is rotatably connected to the seat 10. The upper end of the front connecting rod 49 is located in front of the upper end of the main support frame 45. The front connecting rod 49, the seat 10, and the main support frame 45 form an inverted triangular support structure. The front end of the base bracket 41 is rotatably connected to the lower end of the main support frame 45. The upper end of the rear drive push rod 50 is rotatably connected to the upper end of the main support frame 45, and the lower end of the rear drive push rod 50 is rotatably connected to the base bracket 41. The lower end of the rear drive push rod 50 is located behind the lower end of the main support frame 45. The rear drive push rod 50, the main support frame 45, and the base bracket 41 form a triangular support structure. When walking on flat ground, seat 10 is supported simultaneously by an inverted triangular support structure and a triangular support structure, i.e., a double-triangular structure, resulting in strong structural stability. When seat 10 is going uphill, the controller controls the extension of the rear drive push rod 50 to compensate for the angle of seat 10, causing seat 10 to move forward to adjust its center of gravity and maintain a parallel or nearly parallel state with the ground, while the length of the front connecting rod 49 remains unchanged. When seat 10 is going downhill, the controller controls the shortening of the rear drive push rod 50 to compensate for the angle of seat 10, causing seat 10 to move backward and maintain a parallel or nearly parallel state with the ground, while the length of the front connecting rod 49 remains unchanged. During the uphill or downhill process of seat 10, the length of the rear drive push rod 50 is adjusted to achieve angle compensation for seat 10. Only the triangular support structure changes, while the inverted triangular support structure remains unchanged to ensure the support stability of seat 10 during the angle compensation process. Therefore, the support transmission assembly 40 forms a double-triangular structure, achieving angle compensation for seat 10 during uphill and downhill processes and ensuring the support stability of seat 10. The front connecting rod 49 and the rear drive push rod 50 extend simultaneously to lift the seat 10, allowing the user to retrieve items from higher places. The wheelchair can be folded down simultaneously by shortening the front connecting rod 49 and the rear drive push rod 50, meeting storage requirements.

[0060] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make several improvements and substitutions without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. An electric wheelchair, characterized in that: Includes the controller, seat, front wheels, rear wheels, and supporting drivetrain components; The support transmission assembly includes a base bracket, a main support frame, a front connecting rod, and a rear drive push rod. The front connecting rod and the rear drive push rod are arranged sequentially in the front-rear direction. The upper end of the main support frame is rotatably connected to the seat, and the lower end is connected to the front wheel. The front end of the base bracket is rotatably connected to the lower end of the main support frame, and the rear end is connected to the rear wheel. The two ends of the front connecting rod are respectively connected to the seat and the lower end of the main support frame. The two ends of the rear drive push rod are respectively rotatably connected to the upper end of the main support frame and the base bracket. The front connecting rod, the seat, and the main support frame form an inverted triangular support structure, and the rear drive push rod, the main support frame, and the base bracket form a triangular support structure. The seat is equipped with an angle sensor, and the controller is electrically connected to the angle sensor, the front connecting rod, and the rear drive push rod, respectively. The controller controls the front connecting rod and / or the rear drive push rod to extend and retract.

2. The electric wheelchair according to claim 1, characterized in that: The seat includes a transmission base and a seat cushion. The transmission base is fixed to the rear of the seat cushion. The front connecting rod is rotatably connected to the front end of the transmission base. The upper end of the main support frame is rotatably connected to the rear end of the transmission base. The angle sensor is fixed to the transmission base or the seat cushion.

3. The electric wheelchair according to claim 1, characterized in that: The rear wheel includes a driving component and a rear wheel body. The driving component is connected to the rear wheel in a transmission manner, and the rear wheel body is rotatably connected to the base bracket.

4. The electric wheelchair according to claim 1, characterized in that: The base bracket includes a lower connecting rod and a support connecting rod. There are at least two lower connecting rods. The support connecting rod is connected between the two lower connecting rods. The front ends of the two lower connecting rods are rotatably connected to the two sides of the main support frame, respectively. The lower end of the rear drive push rod and the rear wheel are rotatably connected to the support connecting rod.

5. The electric wheelchair according to claim 4, characterized in that: The support link includes a middle link and a rear link. The rear wheel is rotatably connected to the rear link. The rear ends of the two lower links are fixedly connected to the two ends of the rear link in the width direction. The middle link is located in front of the rear link and is connected between the two lower links. The lower end of the rear drive push rod is rotatably connected to the middle link.

6. The electric wheelchair according to claim 5, characterized in that: The rear wheel includes an upper bracket, a lower base plate, a rear wheel body, and a buffer. One end of the lower base plate is rotatably connected to the rear connecting rod in the front-rear direction. The other end of the lower base plate is connected to the rear wheel body and the lower end of the buffer. The upper end of the buffer is connected to the upper bracket, and the upper bracket is connected to the rear end of the lower connecting rod.

7. The electric wheelchair according to claim 4, characterized in that: The lower connecting rod includes a flat section and an inclined section. The front end of the flat section is connected to the lower end of the inclined section, and the upper end of the inclined section is connected to the lower end of the main support frame.

8. The electric wheelchair according to claim 4, characterized in that: The main support frame includes an upper rod, a lower rod, and a main side rod. The upper rod and the lower rod extend along the width direction. The two ends of the upper rod and the lower rod are respectively connected to the main side rod. The upper rod, the lower rod, and the main side rod are interconnected to form a closed frame structure. The upper end of the rear drive push rod is rotatably connected to the upper rod. The lower end of the front connecting rod is rotatably connected to the lower rod. The front end of the lower side connecting rod is rotatably connected to the main side rod.

9. The electric wheelchair according to claim 1, characterized in that: The front wheel includes a front wheel body and a pedal. The pedal is rotatably connected to the front wheel body at both ends in the width direction, and the rear end of the pedal is connected to the main support frame.

10. The electric wheelchair according to claim 1, characterized in that: The support transmission assembly includes a flat ground walking state, an uphill state, and a downhill state. When the support transmission assembly moves from the flat ground walking state to the uphill state, the rear drive push rod extends; when the support transmission assembly moves from the flat ground walking state to the downhill state, the rear drive push rod shortens.

11. The electric wheelchair according to claim 10, characterized in that: The front connecting rod is a telescopic drive push rod.

12. The electric wheelchair according to claim 11, characterized in that: The support transmission assembly includes a lifting state and a folding state. When the support transmission assembly enters the lifting state, the rear drive push rod and the front connecting rod extend respectively. When the support transmission assembly enters the folding state from the flat ground walking state, the rear drive push rod and the front connecting rod shorten respectively.

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