Lightweight brake device for electric wheelchair

Abstract

This invention relates to the field of wheelchair braking technology, specifically to a lightweight braking device for electric wheelchairs. It effectively solves the problems of existing braking devices being unable to maintain parking on slopes for extended periods and causing injury due to excessive speed when the wheelchair rolls. The device includes a wheelchair body with a linkage shaft rotatably connected to its right side. Wheel hubs are fixedly connected to the front and rear sides of the linkage shaft. A fixed disc, coaxial with the linkage shaft, is fixedly connected to the front of the wheelchair body. Swing rods are hinged to the left and right sides of the front end of the fixed disc. By setting up the linkage shaft, the wheel hubs, fixed disc, swing rods, brake blocks, and parking assembly allow the wheelchair to stop on flat ground or a slope. The parking assembly can then lock the brake blocks against the inner wall of the wheel hub, securing the wheel hub and preventing rotation. This achieves parking and prevents the wheelchair from rolling, without requiring continuous pulling by the user, thus providing lightweight braking.

Description

Technical Field

[0001] The invention relates to the technical field of wheelchair brakes, and in particular to a lightweight brake device for an electric wheelchair. Background Art

[0002] The brake device of an electric wheelchair is an important system to ensure the safety of the user and control the movement of the wheelchair. Its main function is to provide a stable and reliable braking effect to prevent the wheelchair from moving forward or sliding. The existing electric wheelchair is mainly driven by the motor to move the whole during use, and the brake device is mostly an electronic brake. When the battery of the electric wheelchair is powered off, it is easy to slip, and when it slips, the speed is too fast to be controlled, and it is easy to cause personal injury. When it is necessary to park on a slope or other sloped place, the existing brake device requires the patient to hold the handle for a long time to fix the tire, which has a great loss of physical strength and is not light enough, which needs to be solved urgently. Summary of the invention

[0003] In view of the above situation, in order to overcome the defects of the prior art, the purpose of the present invention is to provide a lightweight braking device for an electric wheelchair, which effectively solves the problem that the existing braking device cannot park the vehicle on a slope for a long time and the vehicle may be easily injured due to excessive speed when sliding.

[0004] The technical solution is as follows: the present invention comprises a wheelchair body, wherein the right side of the wheelchair body is rotatably connected with a linkage shaft, the front and rear sides of the linkage shaft are respectively fixedly connected with wheel hubs, the front side of the wheelchair body is fixedly connected with a fixed plate coaxial with the linkage shaft, the left and right sides of the front end of the fixed plate are respectively hinged with swing levers, a brake block is hinged with one end of the swing lever, a parking assembly is provided on the front side of the fixed plate, the parking assembly can drive the brake block to contact the inner wall of the wheel hub through the swing lever, a centrifugal disk is fixedly connected to the rear side of the linkage shaft, a toggle assembly is provided on the outer side of the centrifugal disk, both the centrifugal block and the toggle lever can contact with the toggle assembly, a support plate is fixedly connected to the lower side of the wheelchair body, the upper end of the support plate is fixedly connected with a speed limiting assembly, the toggle assembly and the speed limiting assembly cooperate to limit the speed of the linkage shaft, and a driving assembly is provided on the upper end of the support plate.

[0005] The parking assembly includes a ratchet, an L-shaped support rod is rotatably connected to the rear side of the ratchet, two left and right opposite driving grooves are provided on the ratchet, and connecting rods are respectively provided on the left and right sides of the ratchet, one end of the connecting rod is fixedly connected to a driving pin located in the driving groove on the corresponding side, and the other end of the connecting rod is hinged to the swing rod on the corresponding side, an operating rod is hinged to the front end of the fixed plate, a movable groove is provided in the middle of the operating rod, the rear end of the ratchet is eccentrically fixedly connected to a movable pin located in the movable groove, the front end of the fixed plate is fixedly connected to a fixing frame, and the front end of the fixing frame is provided with a ratchet block which can move left and right and can cooperate with the ratchet.

[0006] The left end of the ratchet block is fixedly connected to a balance rod, a compression spring is sleeved on the balance rod and is located between the ratchet block and the fixed frame, a connecting buckle is fixedly connected to the left end of the balance rod, a sliding groove is provided on the operating rod, a sliding block is slidably connected in the sliding groove, a connecting rod that can be inserted into the connecting buckle is fixedly connected to the lower end of the sliding block, and a rotatable winding frame is provided on the left side of the operating rod.

[0007] The winding frame is connected to the slider via a steel cable, a spur gear is fixedly connected to the front end of the winding frame, a moving ring is slidably connected to the left side of the operating rod, and a rack that can mesh with the spur gear is fixedly connected to the right end of the moving ring.

[0008] The toggle assembly includes a slide rod, the upper end of the slide rod is fixedly connected to a centrifugal block, the upper side of the slide rod is sleeved with a tension spring located between the centrifugal disk and the centrifugal block, the lower end of the slide rod is fixedly connected to a toggle rod, and a compression spring located between the centrifugal disk and the toggle rod is provided below the slide rod. The upper end of the support plate is fixedly connected to a bracket, and a U-shaped moving frame is slidably connected to the bracket. The upper end of the centrifugal block can contact the upper side of the moving frame, the lower end of the toggle rod can contact the lower side of the moving frame, and the upper right end of the moving frame is fixedly connected to a connecting pin.

[0009] The speed limiting assembly includes a support plate, the right end of which is rotatably connected to two spur gears that are opposite to each other and mesh with each other, the right ends of the two spur gears are respectively fixedly connected to connecting rods, the outer wall of the clamping rod is fixedly connected to a U-shaped clamping rod, the opposite ends of the two clamping rods are respectively fixedly connected to speed reduction blocks, a connecting groove is opened on the rear side of the upper clamping rod, the connecting pin is located in the connecting groove, and two tension springs are provided between the two connecting rods.

[0010] A rubber layer is fixedly connected to the middle of the linkage shaft, and the upper and lower sides of the rubber layer can respectively contact the speed reduction blocks on the corresponding sides.

[0011] The driving assembly comprises two front-to-back symmetrical driving motors, the output ends of the driving motors are fixedly connected with small gears, and the front and back sides of the linkage shaft are respectively fixedly connected with large gears that can mesh with the small gears on the corresponding sides.

[0012] The front and rear sides of the wheelchair body are respectively provided with brake assemblies, and the brake assembly includes a mounting block, which is fixedly connected to the wheelchair body, an extrusion rod is hinged on the mounting block, and the extrusion rod can contact the outer wall of the wheel hub on the corresponding side, and an arc-shaped brake rod is hinged on the mounting block, and a straight plate is hinged at the lower end of the brake rod, and the lower end of the straight plate is hinged to the extrusion rod.

[0013] The front and rear sides of the wheelchair body are respectively fixedly connected with connecting frames, the connecting frames are fixedly connected with extension rods, and the extension rods are rotatably connected with anti-tilt wheels.

[0014] The present invention sets a linkage shaft, and when the wheel hub, the fixed plate, the swing rod, the brake block and the parking assembly can be stopped on flat ground or a place with a certain slope, the parking assembly can be used to release and lock the brake block and the inner wall of the wheel hub tightly, so as to fix the wheel hub and prevent it from rotating, thereby achieving the purpose of parking and preventing the vehicle from slipping. There is no need for the user to pull continuously, thus achieving the purpose of light braking.

[0015] The present invention can limit the rotation speed of the linkage shaft by arranging a centrifugal disk, a toggle assembly and a speed limiting assembly. When the wheelchair body stalls during use, the centrifugal disk rotates too fast, which can trigger the toggle assembly to drive the speed reduction block in the limit assembly to release the rubber layer, thereby achieving the purpose of reducing the rotation speed of the linkage shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is the main axonometric drawing of the present invention.

[0017] Figure 2 It is a front view schematic diagram of the wheelchair body in the present invention.

[0018] Figure 3 It is a rear view schematic diagram of the parking assembly in the present invention.

[0019] Figure 4 It is a schematic front view of the ratchet in the present invention.

[0020] Figure 5 It is a right side schematic diagram of the present invention.

[0021] Figure 6 It is a rear view schematic diagram of the speed limiting assembly in the present invention.

[0022] Figure 7 It is a right side schematic diagram of the centrifugal disk in the present invention.

[0023] Figure 8 It is a left schematic view of the centrifugal disk in the present invention.

[0024] Fig. 9 It is a rear view schematic diagram of the drive assembly in the present invention.

[0025] Fig.10 It is a front view schematic diagram of the brake assembly in the present invention.

[0026] Fig.11 The present invention Figure 2 A is an enlarged view of the middle image.

[0027] In the figure: 1, wheelchair body; 2, linkage shaft; 3, wheel hub; 4, fixed plate; 5, swing rod; 6, brake block; 7, parking assembly; 8, centrifugal plate; 9, toggle assembly; 10, support plate; 11, drive assembly; 12, ratchet; 13, support rod; 14, drive slot; 15, connecting rod; 16, drive pin; 17, operating rod; 18, movable slot; 19, movable pin; 20, fixed frame; 21, ratchet block; 22, balance bar; 23, connecting buckle; 24, slider; 25, connecting rod; 26, winding frame; 27, steel cable; 28 , spur gear; 29, moving ring; 30, rack; 31, slide rod; 32, centrifugal block; 33, lever; 34, bracket; 35, moving frame; 36, connecting pin; 37, support plate; 38, spur gear; 39, connecting rod; 40, clamping rod; 41, speed reduction block; 42, connecting groove; 43, rubber layer; 44, driving motor; 45, small gear; 46, large gear; 47, brake assembly; 48, mounting block; 49, extrusion rod; 50, brake rod; 51, straight plate; 52, connecting frame; 53, extension rod; 54, anti-tilt wheel. DETAILED DESCRIPTION

[0028] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0029] Depend on Figures 1 to 8 The wheelchair body 1 includes a linkage shaft 2 which is rotatably connected to the right side of the wheelchair body 1, and wheel hubs 3 are fixedly connected to the front and rear sides of the linkage shaft 2 respectively; a fixed plate 4 which is coaxial with the linkage shaft 2 is fixedly connected to the front side of the wheelchair body 1, and swing rods 5 are hinged to the left and right sides of the front end of the fixed plate 4 respectively, and a brake block 6 is hinged to one end of the swing rod 5; a parking assembly 7 is provided on the front side of the fixed plate 4, and the parking assembly 7 can drive the brake block 6 to contact the inner wall of the wheel hub 3 through the swing rod 5; a centrifugal plate 8 is fixedly connected to the rear side of the linkage shaft 2, and a toggle assembly 9 is provided on the outer side of the centrifugal plate 8, and both the centrifugal block 32 and the toggle rod 33 can contact the toggle assembly 9; a support plate 10 is fixedly connected to the lower side of the wheelchair body 1, and a speed limiting assembly is fixedly connected to the upper end of the support plate 10, and the toggle assembly 9 cooperates with the speed limiting assembly to limit the speed of the linkage shaft 2, and a driving assembly 11 is provided on the upper end of the support plate 10.

[0030] As shown in the figure, a linkage shaft 2, a wheel hub 3, a fixed plate 4, a swing rod 5, a brake block 6 and a parking assembly 7 are provided. When the vehicle can stop on a flat ground or a place with a certain slope, the parking assembly 7 can be used to release the brake block 6 and the inner wall of the wheel hub 3 tightly and then lock it, so as to fix the wheel hub 3 to prevent it from rotating, thereby achieving the purpose of parking and preventing the vehicle from slipping. The vehicle does not need to be pulled continuously by the user, thereby achieving the purpose of light braking. A centrifugal disc 8, a toggle assembly 9 and a speed limiting assembly are provided. The centrifugal disc 8 can be used to drive the speed limiting assembly through the toggle assembly 9 to limit the rotation speed of the linkage shaft 2. When the wheelchair body 1 stalls during use, the centrifugal disc 8 rotates too fast, which can trigger the toggle assembly 9 to drive the speed reduction block 41 in the limit assembly to release the rubber layer 43, thereby achieving the purpose of reducing the rotation speed of the linkage shaft 2. When the speed drops, the toggle assembly 9 can be used again to drive the speed reduction block 41 away from the rubber layer 43, so that the vehicle can be used normally. In this way, the stalling situation can be avoided, resulting in failure to decelerate in time and causing personal injury. A driving assembly 11 is provided to facilitate the movement of the wheelchair.

[0031] The parking assembly 7 includes a ratchet 12, the rear side of the ratchet 12 is rotatably connected to an L-shaped support rod 13, the ratchet 12 is provided with two left and right opposite driving grooves 14, the left and right sides of the ratchet 12 are respectively provided with connecting rods 15, one end of the connecting rod 15 is fixedly connected to a driving pin 16 located in the driving groove 14 on the corresponding side, the other end of the connecting rod 15 is hinged to the swing rod 5 on the corresponding side, an operating rod 17 is hinged to the front end of the fixed plate 4, a movable groove 18 is provided in the middle of the operating rod 17, the rear end of the ratchet 12 is eccentrically fixedly connected to a movable pin 19 located in the movable groove 18, the front end of the fixed plate 4 is fixedly connected to a fixing frame 20, and the front end of the fixing frame 20 is provided with a ratchet block 21 which can move left and right and can cooperate with the ratchet 12.

[0032] As shown in the figure, the ratchet 12, the support rod 13, the driving groove 14, the connecting rod 15 and the driving pin 16 are arranged so that the rotation of the ratchet 12 can be used to drive the two connecting rods 15 to swing away from each other through the driving groove 14 and the driving pin 16, thereby achieving the purpose of driving the upper ends of the two swing rods 5 to swing away from each other, so that the brake block 6 can be closely contacted with the inner wall of the wheel hub 3 to play a braking and parking role. The operating rod 17, the movable groove 18 and the movable pin 19 are arranged so that the operating rod 17 can be used to drive the ratchet 12 to rotate through the movable groove 18 and the movable pin 19. The operating rod 17 is long enough to use the lever principle to reduce the effort required by the operator, thereby achieving the purpose of light braking. The fixed frame 20 is arranged to provide support for the ratchet block 21. The ratchet block 21 is arranged to facilitate limiting the ratchet 12 and locking the wheel hub 3.

[0033] The left end of the ratchet block 21 is fixedly connected to a balance rod 22, and a compression spring 1 is sleeved on the balance rod 22 and is located between the ratchet block 21 and the fixed frame 20. The left end of the balance rod 22 is fixedly connected to a connecting buckle 23. A sliding groove is provided on the operating rod 17, and a slider 24 is slidably connected in the sliding groove. A connecting rod 25 that can be inserted into the connecting buckle 23 is fixedly connected to the lower end of the slider 24. A rotatable winding frame 26 is provided on the left side of the operating rod 17, and the winding frame 26 is connected to the slider 24 via a steel cable 27.

[0034] As shown in the figure, a balance bar 22 and a compression spring 1 are provided to ensure that the ratchet block 21 can limit the ratchet 12 in time, and the compression spring 1 can ensure that the ratchet block 21 is reset in time. A connecting buckle 23, a slider 24, a slide groove, a connecting rod 25 and a winding rack 26 are provided. When braking and parking, the connecting rod 25 can be inserted into the connecting buckle 23 during the downward pressing of the operating rod 17, and then the winding rack 26 can be used to drive the slider 24 to move left in the slide groove via the steel cable 27, and then the ratchet block 21 can be driven to move left via the connecting rod 25 and the connecting buckle 23, so that the limitation of the ratchet 12 can be released, and the operating rod 17 can be used to drive the parking assembly 7 to release the fixation of the wheel hub 3, thereby achieving the purpose of releasing the parking.

[0035] The front end of the winding frame 26 is fixedly connected to a spur gear 28 , the left side of the operating rod 17 is slidably connected to a moving ring 29 , and the right end of the moving ring 29 is fixedly connected to a rack 30 that can mesh with the spur gear 28 .

[0036] As shown in the figure, a spur gear 28, a movable ring 29 and a rack 30 are provided, so that the operator can use the movable ring 29 to drive the rack 30 to move to the right, and then drive the reeling shaft to reel in the steel cable 27 via the spur gear 28, thereby achieving the purpose of releasing the limit of the ratchet block 21 on the ratchet wheel 12.

[0037] The toggle assembly 9 includes a slide rod 31, the upper end of the slide rod 31 is fixedly connected to a centrifugal block 32, the upper side of the slide rod 31 is sleeved with a tension spring located between the centrifugal disk 8 and the centrifugal block 32, the lower end of the slide rod 31 is fixedly connected to a toggle rod 33, and a compression spring located between the centrifugal disk 8 and the toggle rod 33 is provided below the slide rod 31, the upper end of the support plate 10 is fixedly connected to a bracket 34, and a U-shaped moving frame 35 is slidably connected to the bracket 34, the upper end of the centrifugal block 32 can contact the upper side of the moving frame 35, the lower end of the toggle rod 33 can contact the lower side of the moving frame 35, and the upper right end of the moving frame 35 is fixedly connected to a connecting pin 36.

[0038] As shown in the figure, a slide bar 31, a centrifugal block 32, a tension spring, a lever 33, a second tension spring, a bracket 34 and a mobile frame 35 are provided, which can drive the centrifugal disc 8 to rotate when the linkage shaft 2 rotates. The centrifugal disc 8 can apply centrifugal force to the centrifugal block 32 when it rotates. When the speed is too fast, the centrifugal force is greater than the force of the tension spring and the second compression spring, and the centrifugal block 32 can be released from the mobile frame 35, prompting the mobile frame 35 to move upward. When it is not rotating, the mobile frame 35 is in the lower limit position under the action of gravity and the lever 33. At this time, the lever 33 3 and the centrifugal block 32 are not in contact with the moving frame 35. The weight of the centrifugal block 32 and the elastic force of the tension spring and the compression spring can be adjusted according to specific needs, so as to adjust the maximum moving speed of the wheelchair. The bracket 34 is provided to provide a trajectory for the moving frame 35 to move and prevent the moving frame 35 from tilting. The contact positions of the moving frame 35, the centrifugal block 32 and the lever 33 are all provided with inclined surfaces to avoid the problem of being unable to pass, resulting in the linkage shaft 2 directly stopping rotation after being stuck, causing emergency braking and serious consequences.

[0039] The speed limiting assembly includes a support plate 37, the right end of which is rotatably connected to two spur gears 38 that are opposite to each other and mesh with each other, the right ends of the two spur gears 38 are respectively fixedly connected to connecting rods 39, the outer wall of the clamping rod 40 is fixedly connected to a U-shaped clamping rod 40, the opposite ends of the two clamping rods 40 are respectively fixedly connected to speed reduction blocks 41, a connecting groove 42 is opened on the rear side of the upper clamping rod 40, the connecting pin 36 is located in the connecting groove 42, and a compression spring 3 is provided between the two connecting rods 39.

[0040] As shown in the figure, the support plate 37, the spur gear 38, the connecting rod 39, the clamping rod 40 and the speed reduction block 41 are arranged so that the swing of one connecting rod 39 can be utilized to drive the other connecting rod 39 to swing synchronously relative to or opposite to each other through the meshing action of the two spur gears 38, thereby driving the speed reduction block 41 to move relative to or opposite to each other, thereby realizing contact with the rubber layer 43 for deceleration. The unknown connecting groove 42 and the connecting pin 36 can drive the upper connecting rod 39 to swing upward when the centrifugal force is large, thereby realizing the relative movement of the two speed reduction blocks 41, thereby achieving the purpose of deceleration. The arrangement of the compression spring three can serve the purpose of auxiliary deceleration. The total elastic force of the tension spring and the compression spring two is greater than the elastic force of the compression spring three, thereby ensuring that when the rotation speed does not reach the specified deceleration speed, the speed reduction block 41 will not come into contact with the rubber layer 43 to avoid affecting normal driving.

[0041] A rubber layer 43 is fixedly connected to the middle of the linkage shaft 2 , and the upper and lower sides of the rubber layer 43 can contact the speed reduction block 41 on the corresponding side respectively.

[0042] As shown in the figure, the rubber layer 43 can increase friction and improve wear resistance, thereby facilitating deceleration.

[0043] The driving assembly 11 includes two front-to-back symmetrical driving motors 44 , the output ends of the driving motors 44 are fixedly connected to small gears 45 , and the front and back sides of the linkage shaft 2 are respectively fixedly connected to large gears 46 that can mesh with the corresponding side small gears 45 .

[0044] As shown in the figure, the drive assembly 11 is provided so that the drive assembly 11 can be used to drive the wheelchair body 1 to move and provide moving power.

[0045] The wheelchair body 1 is provided with brake assemblies 47 on the front and rear sides respectively. The brake assembly 47 includes a mounting block 48, which is fixedly connected to the wheelchair body 1. An extrusion rod 49 is hinged on the mounting block 48, and the extrusion rod 49 can contact the outer wall of the wheel hub 3 on the corresponding side. An arc-shaped brake rod 50 is hinged on the mounting block 48, and a straight plate 51 is hinged at the lower end of the brake rod 50, and the lower end of the straight plate 51 is hinged to the extrusion rod 49.

[0046] As shown in the figure, the brake assembly 47 is provided to perform manual braking when the wheelchair body 1 is not powered, so that the wheelchair can decelerate normally during use.

[0047] The front and rear sides of the wheelchair body 1 are respectively fixedly connected with connecting frames 52 , an extension rod 53 is fixedly connected to the connecting frame 52 , and an anti-tilt wheel 54 is rotatably connected to the extension rod 53 .

[0048] As shown in the figure, the connection frame 52, the extension rod 53 and the anti-tilt wheel 54 can avoid the problem of overturning due to excessive backward tilt angle when the wheelchair needs to be lifted up during use, thereby improving the safety of the wheelchair.

[0049] When the present invention is in use, the drive motor 44 is started, and the drive motor 44 drives the wheelchair to move as a whole. When it is necessary to park, the operator can swing the operating lever 17 downward, and the operating lever 17 drives the ratchet 12 to rotate through the movable groove 18 and the movable pin 19. The ratchet 12 drives the connecting rods 15 on both sides to move in opposite directions through the driving groove 14 and the driving pin 16, and then the brake block 6 can be driven to closely contact with the inner wall of the wheel hub 3 through the swing rod 5, so that the wheel hub 3 is fixed and the purpose of parking is achieved. At this time, the ratchet block 21 is in a limited state with respect to the ratchet 12;

[0050] When it is necessary to release the parking, the moving ring 29 is moved backward, and the moving ring 29 drives the spur gear 28 to rotate through the rack 30, thereby driving the winding frame 26 to reel in the steel cable 27, and the slider 24 moves to the left. The connecting rod 25 pulls the ratchet block 21 to move to the left through the connecting buckle 23 and the balance bar 22, and the compression spring contracts. At this time, the ratchet 12 is released from the limit, and then the front side of the operating rod 17 is swung upward, the ratchet 12 rotates, and the connecting rods 15 on both sides move relatively, and the brake block 6 is no longer in close contact with the inner wall of the wheel hub 3, and the contact is limited to the wheel hub 3. Then, the moving ring 29 and the operating rod 17 are released to realize the release of the parking, and the wheelchair can continue to move;

[0051] When the wheelchair is traveling on a downhill road, it is easy to stall due to gravity. When stalling occurs, the rotation speed of the linkage shaft 2 increases, and the rotation speed of the centrifugal disc 8 increases synchronously. At this time, the centrifugal block 32 gradually extends out of the centrifugal disc 8 and contacts the upper side of the moving frame 35. The lever 33 moves toward the axis of the centrifugal disc 8 and no longer contacts the moving frame 35, and then drives the moving frame 35 to move upward. During the upward movement of the moving frame 35, the connecting pin 36 and the connecting groove 42 drive the upper connecting rod 39 to move upward. Under the action of the two spur gears 38, the two connecting rods 39 swing back to back. After the two reduction blocks 41 move relatively and contact the rubber layer 43, they begin to reduce the rotation speed of the linkage shaft 2 by increasing the friction force, ensuring that the rotation speed will not be too fast, thereby achieving the purpose of speed limit.

[0052] When the speed is reduced and stabilized, the lever 33 is acted upon by the tension spring and the compression spring 2 to gradually extend the centrifugal disc 8, and the centrifugal block 32 retracts the centrifugal disc 8, and then the moving frame 35 moves downward, and the two deceleration blocks 41 are no longer in contact with the rubber layer, and the vehicle can travel normally.

[0053] In the present invention, the driving motor 44 is a prior art and will not be described in detail here.

[0054] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A lightweight brake device for an electric wheelchair, comprising a wheelchair body (1), characterized in that: The right side of the wheelchair body (1) is rotatably connected to a linkage shaft (2), the front and rear sides of the linkage shaft (2) are respectively fixedly connected to wheel hubs (3), the front side of the wheelchair body (1) is fixedly connected to a fixed plate (4) coaxial with the linkage shaft (2), the front side of the fixed plate (4) is respectively hinged to swing rods (5) on the left and right sides of the front end, a brake block (6) is hinged to one end of the swing rod (5), and a parking assembly (7) is provided on the front side of the fixed plate (4), and the parking assembly (7) can drive the brake block (6) to engage with the wheelchair via the swing rod (5). The wheelchair body (1) is in contact with the inner wall of the wheel hub (3); a centrifugal disc (8) is fixedly connected to the rear side of the linkage shaft (2); a toggle assembly (9) is provided on the outer side of the centrifugal disc (8); both the centrifugal block (32) and the toggle rod (33) can contact the toggle assembly (9); a support plate (10) is fixedly connected to the lower side of the wheelchair body (1); a speed limiting assembly is fixedly connected to the upper end of the support plate (10); the toggle assembly (9) cooperates with the speed limiting assembly to limit the speed of the linkage shaft (2); and a driving assembly (11) is provided on the upper end of the support plate (10); The toggle assembly (9) comprises a slide bar (31), the upper end of the slide bar (31) is fixedly connected to a centrifugal block (32), the upper side of the slide bar (31) is sleeved with a tension spring located between the centrifugal disc (8) and the centrifugal block (32), the lower end of the slide bar (31) is fixedly connected to a toggle rod (33), a compression spring located between the centrifugal disc (8) and the toggle rod (33) is provided below the slide bar (31), the upper end of the support plate (10) is fixedly connected to a bracket (34), a U-shaped moving frame (35) is slidably connected to the bracket (34), the upper end of the centrifugal block (32) can contact the upper side of the moving frame (35), the lower end of the toggle rod (33) can contact the lower side of the moving frame (35), and the upper right end of the moving frame (35) is fixedly connected to a connecting pin (36); The speed limiting assembly comprises a support plate (37), the right end of the support plate (37) is rotatably connected to two spur gears (38) that are opposed to each other and mesh with each other, the right ends of the two spur gears (38) are respectively fixedly connected to connecting rods (39), the outer wall of the clamping rod (40) is fixedly connected to a U-shaped clamping rod (40), the opposite ends of the two clamping rods (40) are respectively fixedly connected to speed reduction blocks (41), the rear side of the upper clamping rod (40) is provided with a connecting groove (42), the connecting pin (36) is located in the connecting groove (42), and a compression spring (3) is provided between the two connecting rods (39); A rubber layer (43) is fixedly connected to the middle of the linkage shaft (2), and the upper and lower sides of the rubber layer (43) can respectively contact the speed reduction blocks (41) on the corresponding sides.

2. The portable brake device for an electric wheelchair according to claim 1, characterized in that: The parking assembly (7) comprises a ratchet (12), the rear side of the ratchet (12) is rotatably connected to an L-shaped support rod (13), the ratchet (12) is provided with two left and right opposite driving grooves (14), the left and right sides of the ratchet (12) are respectively provided with connecting rods (15), one end of the connecting rod (15) is fixedly connected to a driving pin (16) located in the driving groove (14) on the corresponding side, the other end of the connecting rod (15) is hinged to the swing rod (5) on the corresponding side, the front end of the fixed plate (4) is hinged to an operating rod (17), the middle part of the operating rod (17) is provided with a movable groove (18), the rear end of the ratchet (12) is eccentrically fixedly connected to a movable pin (19) located in the movable groove (18), the front end of the fixed plate (4) is fixedly connected to a fixing frame (20), the front end of the fixing frame (20) is provided with a ratchet block (21) which can move left and right and can cooperate with the ratchet (12).

3. The portable brake device for an electric wheelchair according to claim 2, characterized in that: The left end of the ratchet block (21) is fixedly connected to a balance rod (22), a compression spring is sleeved on the balance rod (22) and is located between the ratchet block (21) and the fixed frame (20), the left end of the balance rod (22) is fixedly connected to a connection buckle (23), a sliding groove is provided on the operating rod (17), a slider (24) is slidably connected in the sliding groove, a connection rod (25) which can be inserted into the connection buckle (23) is fixedly connected to the lower end of the slider (24), and a rotatable winding frame (26) is provided on the left side of the operating rod (17), and the winding frame (26) is connected to the slider (24) via a steel cable (27).

4. The portable brake device for an electric wheelchair according to claim 3, characterized in that: The front end of the winding frame (26) is fixedly connected to a spur gear (28), the left side of the operating rod (17) is slidably connected to a moving ring (29), and the right end of the moving ring (29) is fixedly connected to a rack (30) that can mesh with the spur gear (28).

5. The portable brake device for an electric wheelchair according to claim 1, characterized in that: The drive assembly (11) comprises two front-to-rear symmetrical drive motors (44), the output ends of the drive motors (44) being fixedly connected to pinions (45), and the front and rear sides of the linkage shaft (2) being respectively fixedly connected to large gears (46) that can mesh with the corresponding side pinions (45).

6. The portable brake device for an electric wheelchair according to claim 1, characterized in that: The wheelchair body (1) is provided with brake assemblies (47) on the front and rear sides respectively. The brake assembly (47) comprises a mounting block (48). The mounting block (48) is fixedly connected to the wheelchair body (1). An extrusion rod (49) is hinged on the mounting block (48). The extrusion rod (49) can contact the outer wall of the wheel hub (3) on the corresponding side. An arc-shaped brake rod (50) is hinged on the mounting block (48). A straight plate (51) is hinged on the lower end of the brake rod (50). The lower end of the straight plate (51) is hinged to the extrusion rod (49).

7. The portable brake device for an electric wheelchair according to claim 1, characterized in that: The front and rear sides of the wheelchair body (1) are respectively fixedly connected to connecting frames (52), an extension rod (53) is fixedly connected to the connecting frame (52), and an anti-tilt wheel (54) is rotatably connected to the extension rod (53).

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