JP2011147767A - Wheelchair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain smooth braking with small sensory shock upon braking a wheelchair in which a rider rotates a rim handle to transmit drive force to main wheels. <P>SOLUTION: In the wheelchair, a decelerator 20 to decelerate rotation of a rim handle 40 is set between a main wheel 10 and a rim handle 40, and a brake mechanism braking the main wheel 10 by pressing the rim handle 40 against the main wheel 10 side is set between the decelerator 20 and the rim handle 40. The brake mechanism has such structure that a brake pad 26a and a brake disk 42 are attached to opposite faces of the decelerator 20 with an output side attached to the main wheel 10 and the rim handle 40, and is provided with a spring 43 for separating the brake pad 26a and the brake disk 42 upon not-braking time. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a human-powered wheelchair that is operated and traveled by a passenger, and more particularly to a technique that enables a brake operation without releasing a hand from a rim handle.

  Conventionally, Patent Document 1 discloses a wheelchair having a rim handle and a brake mechanism. This technology is characterized by a structure in which a disc brake is interposed between the main wheel and the rim handle, and the rim handle is pivotally supported on the shaft of the main wheel so that the rim handle can be moved in the axial direction. According to this structure, when the rim handle is pressed to the main wheel side, the brake pad and the brake disc come into surface contact to brake the main wheel, and the brake operation can be performed without releasing the hand from the rim handle. Is.

  By the way, in the above technology, the rotation of the rim handle is pressed against the main wheel side, so that the relative rotation difference between the main wheel and the rim handle is large, and the sensible shock experienced by the passenger during braking is large. there were. When reducing this sensation shock, the pressing force of the rim handle will be adjusted, but for the disabled and elderly people who are difficult to adjust the force, the sensation shock received each time the brake is operated may cause fatigue. .

Utility Model Registration No. 3019779

  The problem to be solved by the present invention is to solve these conventional problems and to obtain smooth braking with less sensation shock during braking.

The configuration of the present invention that solves this problem is as follows.
1) In a human-powered wheelchair in which the rider rotates the rim handle to transmit the driving force to the main wheel, a transmission is provided between the main wheel and the rim handle to shift the rotation of the rim handle and transmit it to the main wheel. The wheelchair is equipped with a brake mechanism that can brake the main wheel when the rim handle is pressed against the main wheel between the transmission and the rim handle. 2) The brake mechanism is attached to the main wheel. The wheelchair described in 1) above, wherein a brake pad and a brake disc are attached to the opposite surfaces of the transmission and the rim handle, and a spring is provided to separate the brake pad and the brake disc when not braking. The wheelchair described in 1) or 2) above, in which the machine is provided with a switching means for switching the input side and the output side to be linked and disconnected. The transmission decelerates the rotation of the rim handle and transmits it to the main wheel. The wheelchair described in any one of 1) to 3) 5) The transmission can be attached to and detached from the main wheel. The wheelchair described in any one of 1) to 4) above. The wheelchair described in 5) above, which is detachably attached to the spoke. 7) The transmission includes an input shaft coupled to the rim handle, a sun gear interlocked with the input shaft by a key, and a mesh with the sun gear. A planetary gear reducer comprising a planetary gear that rotates and revolves, a rotatable planetary gear carrier that supports the planetary gear, and a gear case that has an internal gear that meshes with the planetary gear. Is fixed to the wheel axle, a fixed disk is installed in the transmission, the fixed disk is attached to the wheel axle, the gear case is attached to the main wheel, and the planetary gear carrier is attached to the fixed disk. Against The wheelchair 8 according to any one of 1) to 6) above, wherein a first switching means for fixing or separating is provided and a second switching means for fixing or separating the planetary gear carrier with respect to the gear case is provided. The wheelchair described in 7) above, wherein the rim handle is provided with a one-way clutch that idles during forward rotation.

  According to the configuration described in 1) of the present invention, when the rim handle is pressed to the main wheel side during traveling, the main wheel tends to be braked by the brake mechanism. Therefore, the relative rotation difference between the main wheel and the rim handle becomes smaller compared to when the rim handle of the prior art is pressed against the main wheel while stopped. Braking is relieved, the vehicle is decelerated smoothly, and the sensation shock received during braking is reduced. If the rim handle comes into contact with another structure (wall, furniture, etc.) or a passerby while traveling, the rim handle moves to the main wheel by the reaction and sudden braking is applied instantly. Absorbs impacts on structures and passers-by to prevent damage to structures and passers-by injuries, and reduces the impact on passengers.

  According to the configuration described in 2) of the present invention, the brake pad and the brake disc are separated by the spring unless the rim handle is pressed against the main wheel with a force greater than the biasing force of the spring. It is possible to reduce braking during operation and reduce driving loss.

  According to the configuration described in 3) of the present invention, the switching means switches the input side and the output side of the transmission to interlock with each other, so that the passenger can travel by operating by himself. When the switching means switches between the input side and the output side of the transmission, the rim handle can be freely rotated when the assistant pushes the wheelchair, and the passenger holds the rim handle while driving and takes the posture. It can be stabilized. At this time, the brake operation is also possible by pressing the rim handle toward the main wheel at the will of the passenger.

  According to the configuration described in 4) of the present invention, since the rotation of the rim handle is decelerated and transmitted to the main wheel, the wheelchair can be easily moved forward and backward with a small force.

  According to the configuration of the fifth and sixth aspects of the present invention, it can be retrofitted to an existing wheelchair and can be implemented at low cost.

  According to the configuration described in 7) of the present invention, when the planetary gear carrier is separated from the fixed disk by the first switching means and the planetary gear carrier is separated from the gear case by the second switching means, the rim handle is rotated in any direction. Also, the passenger can hold the rim handle when the assistant pushes the wheelchair and can stabilize the posture. Further, when the planetary gear carrier is separated from the fixed disk by the first switching means and the planetary gear carrier is fixed to the gear case by the second switching means, the main wheel rotates in the same direction at a gear ratio of 1: 1 when the rim handle rotates, You can move forward and backward with the same handling as a conventional wheelchair. Further, when the planetary gear carrier is fixed to the fixed disk by the first switching means, and the planetary gear carrier is separated from the gear case by the second switching means, the main wheel decelerates and rotates forward when the rim handle rotates backward, with a small force. The wheelchair can be moved forward and backward easily. In this way, the travel mode can be switched freely.

  According to the configuration described in 8) of the present invention, since the driving force is transmitted only when the rim handle is rotated backward and the main wheel rotates forward, the reciprocating operation can be performed while holding the rim handle and holding the fixed position. Can be advanced and braked to improve operability.

It is a side view of the wheelchair of Example 1. It is an exploded view of the reduction gear of Example 1. FIG. It is an exploded view of the brake mechanism of Example 1. FIG. It is a partially cutaway side view showing the assembled state of the speed reducer and brake mechanism of the first embodiment. It is a partially cutaway side view showing a braking state of the brake mechanism of the first embodiment. 6 is a graph showing a difference in rotation between the main wheel and the rim handle during braking according to the first embodiment. It is an exploded view of the reduction gear of Example 2. FIG. It is a partially notched sectional view which shows the assembly state of the reduction gear and brake mechanism of Example 2. FIG. It is explanatory drawing which shows detachment | leave of the pin of Example 2. FIG. It is explanatory drawing which shows switching of the driving mode by lever operation of Example 2. FIG. It is explanatory drawing which shows operation | movement of the reduction gear of Example 2. FIG. It is an exploded view of the reduction gear of Example 3. FIG.

  DESCRIPTION OF EMBODIMENTS Hereinafter, modes for carrying out the present invention will be specifically described with reference to each embodiment and drawings.

(Embodiment 1) FIG. 1 is a side view of a wheelchair of Embodiment 1, FIG. 2 is an exploded view of a reduction gear of Embodiment 1, FIG. 3 is an exploded view of a brake mechanism of Embodiment 1, and FIG. FIG. 5 is a partially cutaway side view showing a braking state of the brake mechanism of the first embodiment, and FIG. 6 is a main wheel during braking of the first embodiment. It is a graph which shows the rotation difference of a rim handle.

  In the figure, 1 is a frame, 2 is an auxiliary wheel, 3 is a chair, 4 is a grip, 5 is a footrest, 6 is a parking brake, 10 is a main wheel, 11 is a spoke, 12 is a hub, 20 is a reduction gear (shift) ), 21 is a planetary gear carrier, 21a is a planetary gear shaft, 21b is a notch, 22 is a planetary gear, 23 is a gear case, 23a is an internal gear, 23b is a stopper hole, 24 is a sun gear, 24a is a shaft hole, 24b is a key groove, 25 is an input shaft, 25a is a screw hole, 25b is a spline, 25c is a key, 26 is a front lid, 26a is a brake pad, 27 is a rear lid, 28 is a stopper (switching means), 30 is a bracket, 31 is a U bolt, 40 is a rim handle, 40a is a spoke, 41 is a boss, 42 is a brake disk, 43 is a spring, 44 is a cover, and 45 is a screw.

  As shown in FIG. 1, the wheelchair of the first embodiment includes a frame 1, an auxiliary wheel 2 that assists in changing the direction of the wheelchair, a chair 3, a grip 4 that is held when an assistant pushes the wheelchair, A footrest 5 on which a foot is placed, a parking brake 6 that stops the wheelchair when not in use and when getting on and off, a main wheel 10 having spokes 11, a rim handle 40 that drives and brakes the main wheel 10, and a rim handle 40 The speed reducer 20 is configured to decelerate the rotation and transmit it to the main wheel 10.

  As shown in FIG. 2, the speed reducer 20 is pivotally supported by a planetary gear carrier 21 in which three planetary gear shafts 21 a are projected and a plurality of notches 21 b are formed on the outer edge, and the planetary gear shaft 21 a of the planetary gear carrier 21. Three planetary gears 22, a gear case 23 in which an internal gear 23 a that meshes with the planetary gear 22 is formed on the inner surface and a stopper hole 23 b is formed on the outer surface, and a key groove 24 b in the shaft hole 24 a and three planetary gears. A sun gear 24 that meshes with the gear 22, an input shaft 25 that includes a spline 25b having a screw hole 25a on the end surface, and a key 25c that engages with a key groove 24b of the sun gear 24, and a brake pad 26a on the outer surface. The front lid 26 for closing the front of the gear case 23, the rear lid 27 for closing the rear of the gear case 23, and the stopper hole 23b of the gear case 23 are inserted into the planetary gear carrier 21. It is constituted by a stopper 28 which allows locking releasably notch 21b. In addition, if the reduction gear 20 and the input shaft 25 are replaced, it will become a gearbox and can be used for competition.

  As shown in FIG. 3, the rim handle 40 is a brake that constitutes a disc brake by combining a boss 41 into which the spline 25b of the input shaft 25 is fitted and a brake pad 26a that is integrally provided in the boss 41 and that is included in the speed reducer 20. A disc 42, a spring 43 that separates the brake disc 42 from the brake pad 26 a when not braked, a cover 44 that covers the boss 41, the brake disc 42 and the spring 43, and a screw that fixes the cover 44 to the screw hole 25 a of the input shaft 25. 45. A slight play is formed between the spline 25b and the boss 41 so that the boss 41 can slide smoothly in the axial direction.

  Hereinafter, the assembly procedure will be described with reference to FIGS. First, the bracket 30 is attached to the back surface of the reduction gear 20, and the reduction gear 20 is attached to the main wheel 10 by fixing the bracket 30 to the spoke 11 of the main wheel 10 with the U bolt 31. Next, the boss 41 of the rim handle 40 is fitted into the spline 25b of the input shaft 25 so that the brake disk 42 and the brake pad 26a face each other, the boss 41 and the brake disk 42 are covered with the cover 44 via the spring 43, and the screw 45 is screwed into the screw hole 25 a from the outside of the cover 44 to fix the cover 44 to the input shaft 25. The other main wheel 10 is assembled in the same procedure. In this way, it can be easily retrofitted to an existing wheelchair.

  Hereinafter, the usage method of a wheelchair is demonstrated. Although the rim handle 40 can be moved in the axial direction, the rim handle 40 is normally positioned outside by the pulling force of the spring 43, and the brake pad 26a and the brake disc 42 are separated and do not brake. When the rider operates by himself / herself, the stopper 28 is inserted into the stopper hole 23b of the gear case 23 and locked in the notch 21b of the planetary gear carrier 21, and the planetary gear carrier 21 and the gear case 23 are rotated together. To a state.

  When the rim handle 40 is rotated in this state, the driving force is transmitted to the boss 41 and the input shaft 25 of the speed reducer 20 so that the sun gear 24 rotates, and the planetary gear 22 rotates while the sun gear 24 rotates. The force is decelerated and transmitted to the gear case 23, and the main wheel 10 rotates and travels at the decelerated rotational speed. Therefore, the wheelchair can be easily moved forward and backward with a small force.

  When the assistant pushes the wheelchair, the stopper 28 is removed from the stopper hole 23b of the gear case 23 so that the planetary gear carrier 21 can freely rotate with respect to the gear case 23. In this state, even if the rim handle 40 is rotated, the planetary gear carrier 21 idles and the driving force is not transmitted to the gear case 23, so that the rider can hold the rim handle 40 and stabilize the posture while traveling. In addition, when the speed when being pushed is high and the passenger feels danger, the rider presses the rim handle 40 toward the main wheel 10 to apply the brake, and the speed can be arbitrarily reduced to a speed that feels safe.

  When braking, the palm is slid on the rim handle 40 and pressed against the main wheel 10 as shown in FIG. 5 to bring the brake pad 26a and the brake disc 42 into surface contact and brake the main wheel 10. At that time, the rim handle 40 is rotated in the same direction at a speed different from that of the main wheel 10 by the speed reducer 20 (see FIG. 6), so that the main wheel 10 and the rim handle are compared with the case where the braking side of the prior art is fixed. The rotation difference relative to 40 is reduced, braking is relaxed, and the wheelchair is decelerated smoothly. Therefore, even if a disabled person or an elderly person who is difficult to adjust force is braked, the experience shock received during braking is small or almost none, so that fatigue can be reduced and the user can ride comfortably. In addition, when the rim handle 40 comes into contact with another structure or a passerby while traveling, the rim handle 40 moves toward the main wheel 10 by the reaction, and sudden braking is instantaneously applied. The impact on the passerby can be absorbed to prevent damage to the structure and injury to the passerby, and to reduce the impact on the passenger.

(Embodiment 2) Embodiment 2 shown in FIGS. 7 to 11 is an example of a wheelchair having various traveling modes. FIG. 7 is an exploded view of the speed reducer of the second embodiment, FIG. 8 is a partially cutaway sectional view showing an assembled state of the speed reducer and the brake mechanism of the second embodiment, and FIG. FIG. 10 is an explanatory diagram showing the switching of the running mode by lever operation of the second embodiment, and FIG. 11 is an explanatory diagram showing the operation of the speed reducer of the second embodiment. In the figure, 13 is a wheel shaft, 21c is a pin hole, 26b is a pin disk, 26c is a pin, 26d is a tension spring, 27a is a fixed disk, 27b is a pin hole, 29a is a first switching lever (first switching means), 29b is a pressing piece, 29c is a second switching lever (second switching means), and 29d is a latching piece.

  The wheel shaft 13 of the wheelchair of the second embodiment is a fixed shaft that does not rotate, and is supported so that the main wheel 10 can freely rotate with respect to the wheel shaft 13. As shown in FIGS. 7 and 8, the speed reducer 20 has three pin holes 21 c in the planetary gear carrier 21 and three pin holes 27 b between the planetary gear carrier 21 and the rear cover 27. 27a is arranged. The fixed disk 27 a is attached to the wheel shaft 13, and the rear lid 27 is attached to the main wheel 10 through the wheel shaft 13.

  Between the front lid 26 and the planetary gear carrier 21, a pin disk 26b having three pins 26c projecting inward is disposed, and the pin 26c is inserted into the pin hole 21c of the planetary gear carrier 21. The pin disk 26b and the planetary gear carrier 21 are connected by a tension spring 26d and urged in the proximity direction, and the pin 26c can be inserted into and removed from the pin hole 27b of the fixed disk 27a by slightly sliding the pin disk 26b in the axial direction. I am doing so.

  A first switching lever 29a having a pressing piece 29b at the tip and a second switching lever 29c having a latching piece 29d at the tip are rotatably attached to the gear case 23. As shown in FIG. 9, the pressing piece 29b of the first switching lever 29a contacts the edge of the pin disk 26b, slides the pin disk 26b outward, and pulls out the pin 26c from the pin hole 27b of the fixed disk 27a. It can be done. The latching piece 29d of the second switching lever 29c can be latched on the notch 21b of the planetary gear carrier 21.

  In the second embodiment, as shown in FIG. 10A, the first switching lever 29a is set to the locked position, the pin disk 26b is slid outward by the pressing piece 29b, and the pin 26c is removed from the pin hole 27b of the fixed disk 27a. . Further, the second switching lever 29c is set to the free position, and the latching piece 29d is removed from the notch 21b of the planetary gear carrier 21. As a result, the planetary gear carrier 21 is not fixed to the gear case 23 and the fixed disk 27a. Even if the rim handle 40 is rotated in any direction in this state, as shown in FIG. 11A, the planetary gear 22 rotates and the planetary gear carrier 21 idles. Accordingly, since the driving force is not transmitted to the gear case 23, a free mode in which the passenger can hold the rim handle 40 and stabilize the posture when the assistant pushes the wheelchair is set. If you feel that the speed is high when you push it, the passenger will apply the brakes by pressing the rim handle 40 toward the main wheel 10 as in the case of the first embodiment. it can.

  As shown in FIG. 10B, with the first switching lever 29a in the locked position, the pin disk 26b is slid outward by the pressing piece 29b, and the pin 26c is removed from the pin hole 27b of the fixed disk 27a. Further, the latching piece 29d is latched to the notch portion 21b of the planetary gear carrier 21 by setting the second switching lever 29c to the lock position. Thereby, the planetary gear carrier 21 is fixed to the gear case 23 and is not fixed to the fixed disk 27a. When the rim handle 40 is rotated forward in this state, as shown in FIG. 11B, the planetary gear 22 cannot rotate and revolves according to the rotation of the sun gear 24, and the gear case 23 rotates forward. Therefore, the main wheel 10 rotates in the same direction as the rotation direction of the rim handle 40 at a gear ratio of 1: 1, and a normal traveling mode is set in which the main wheel 10 can move forward and backward with the same handling as a conventional wheelchair. At the time of braking, the palm is pressed against the main wheel 10 while sliding on the rim handle 40, and the brake pad 26a and the brake disc 42 are brought into surface contact for braking. At that time, since the rim handle 40 rotates at the same speed as the main wheel 10, the sensible shock is equivalent to that of a conventional wheelchair.

  As shown in FIG. 10 (c), the first switching lever 29a is moved to the free position, the presser piece 29b is separated from the pin disk 26b, and the pin disk 26b is slid inward by the urging force of the tension spring 26d to fix the pin 26c. It is inserted into the pin hole 27b of the disk 27a. Further, the second switching lever 29c is set to the free position, and the latching piece 29d is removed from the notch 21b of the planetary gear carrier 21. As a result, the planetary gear carrier 21 is fixed to the fixed disk 27 a and is not fixed to the gear case 23. When the rim handle 40 is rotated in this state, the gear case 23 is decelerated and rotated in the direction opposite to the sun gear 24 by the rotation of the planetary gear 22 as shown in FIG. Therefore, the main wheel 10 is decelerated in the opposite direction to the rim handle 40 and is rotated forward, and the decelerating / boosting mode is set in which the wheelchair can be easily moved forward and backward with a small force. At the time of braking, braking is performed by pressing the palm toward the main wheel 10 while sliding the palm on the rim handle 40 as in the normal traveling mode. At that time, since the rim handle 40 is rotated at a speed different from that of the main wheel 10 by the speed reducer 20, the relative rotation difference between the main wheel 10 and the rim handle 40 is reduced as in the first embodiment, and braking is performed. It is alleviated and the wheelchair can be smoothly decelerated to reduce the shock.

  When the planetary gear carrier 21 is fixed to the fixed disk 27a with the first switching lever 29a in the free position and the planetary gear carrier 21 is fixed to the gear case 23 with the second switching lever 29c in the locked position, the main wheel 10 and the rim handle 40 are fixed. Both are fixed to the wheel shaft 13, and a parking mode in which the wheelchair does not travel can be set. As described above, in the second embodiment, the traveling mode can be freely switched. Other reference numerals and configurations are the same as those in the first embodiment.

(Embodiment 3) Embodiment 3 shown in FIG. 12 is an example in which the operability during traveling and braking of the wheelchair of Embodiment 2 is improved. FIG. 12 is an exploded view of the reduction gear according to the third embodiment. In the figure, 25d is a one-way clutch. The input shaft 25 of the third embodiment incorporates a one-way clutch 25d as shown in FIG. 12, and the spline 25b has a structure that rotates forward with respect to the main body portion of the input shaft 25 but does not rotate backward.

  In the third embodiment, the first switching lever 29a and the second switching lever 29c are set to the positions shown in FIG. 10C to enter the deceleration / boost travel mode, and the rim handle 40 is rotated backward to advance the wheelchair. In the middle of this, even if the rim handle 40 is stopped or rotated forward in the reverse direction, the input shaft 25 and the sun gear 24 continue to be rotated as they are by the one-way clutch 25d, and the wheelchair moves forward with inertia. Furthermore, if the rim handle 40 is once rotated forward and then reversed, the wheelchair is reaccelerated during the reverse rotation, and if this is repeated, the wheelchair continuously runs. As described above, since the driving force is transmitted only when the rim handle 40 is rotated backward, the rim handle 40 can be moved forward and backward by rowing the boat while holding the fixed position without changing the rim handle 40. The operability is improved as compared with the second deceleration / boost travel mode. Further, during braking, the one-way clutch 25d can be pressed against the main wheel 10 while holding the rim handle 40, and the operability of the brake is improved. Furthermore, a long lever (not shown) may be provided to project upward from the boss 41 of the rim handle 40, and the lever may be swung back and forth and left and right to allow forward and brake operations. When the rim handle 40 is rotated forward, the driving force is not transmitted by the one-way clutch 25d, so there is no reverse operation function. Other reference numerals and configurations are the same as those in the second embodiment.

  The technology of the present invention is used in a human-powered wheelchair in which a passenger rotates a rim handle to transmit a driving force to a main wheel.

1 Frame 2 Auxiliary Wheel 3 Chair 4 Grip 5 Footrest 6 Parking Brake 10 Main Wheel 11 Spoke 12 Hub 13 Wheel Shaft 20 Reducer (Transmission)
21 planetary gear carrier 21a planetary gear shaft 21b notch 21c pin hole 22 planetary gear 23 gear case 23a internal gear 23b stopper hole 24 sun gear 24a shaft hole 24b keyway 25 input shaft 25a screw hole 25b spline 25c key 25d one-way clutch 26 Lid 26a Brake pad 26b Pin disc 26c Pin 26d Tension spring 27 Rear lid 27a Fixed disc 27b Pin hole 28 Stopper (switching means)
29a First switching lever (first switching means)
29b Presser piece 29c Second switching lever (second switching means)
29d Hook 30 Bracket 31 U Bolt 40 Rim Handle 40a Spoke 41 Boss 42 Brake Disc 43 Spring 44 Cover 45 Screw

Claims (8)

  In a human-powered wheelchair in which a rider rotates a rim handle to transmit driving force to the main wheel, a transmission is provided between the main wheel and the rim handle to shift the rotation of the rim handle and transmit it to the main wheel. A wheelchair characterized in that a brake mechanism is provided between the transmission and the rim handle so as to brake the main wheel when the rim handle is pressed toward the main wheel.   The brake mechanism has a structure in which a brake pad and a brake disc are attached to the opposing surface of the transmission and the rim handle, the output side of which is attached to the main wheel, and a spring that separates the brake pad and the brake disc when not braking is provided. The wheelchair according to claim 1.   The wheelchair according to claim 1 or 2, wherein the transmission is provided with switching means for switching between interlocking and disconnecting between the input side and the output side.   The wheelchair according to claim 1, wherein the transmission decelerates the rotation of the rim handle and transmits it to the main wheel.   The wheelchair according to any one of claims 1 to 4, wherein the transmission is detachable from the main wheel.   The wheelchair according to claim 5, wherein the transmission is detachably attached to the spokes of the main wheel with a bracket.   The transmission has an input shaft connected to the rim handle, a sun gear that is linked to the input shaft by a key, a planetary gear that rotates and revolves by meshing with the sun gear, and a rotatable gear that supports the planetary gear. A planetary gear reducer composed of a planetary gear carrier and a gear case having an internal gear that meshes with the planetary gear, the main wheel being rotatably supported with respect to a fixed wheel shaft, and in the transmission A fixed disk is provided, the fixed disk is attached to the wheel shaft, the gear case is attached to the main wheel, and a first switching means for fixing or separating the planetary gear carrier with respect to the fixed disk is provided, and the planetary gear carrier is the gear case. The wheelchair in any one of Claims 1-6 which provided the 2nd switching means to fix or separate with respect to.   The wheelchair according to claim 7, wherein a one-way clutch is provided on the input shaft of the transmission so that the rim handle idles during forward rotation.

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