JP2001245936A - Wheelchair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wheelchair in which the brake is automatically applied in backward direction without generating retreating, even if advancing is interrupted at the time of going up on a slope. SOLUTION: A wheel 1 is constituted to be rotated via a planetary gear type internal gear differential mechanism M.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wheelchair which is safe and can be rotated by a passenger with a small force.

[0002]

2. Description of the Related Art Conventionally, in a wheelchair, even if the occupant tries to go out alone, there is a sloping road, so that an uphill cannot be climbed only by the force of an arm, and on a downhill, acceleration is fearful and fearful. I could not go out alone because I had to go down while applying the brakes. Also, the wheelchair is equipped with a manual brake. There is a problem that it is dangerous for a disabled person to go uphill with a wheelchair.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a safe wheelchair which does not retreat even if the vehicle stops moving forward on an uphill or the like. For the purpose, the first gist is that the wheel is configured to rotate via a planetary gear type internal gear hysteresis mechanism.
The second gist is that the planetary gear type internal tooth hysteresis mechanism includes:
A shaft body having an eccentric cam portion rotated by receiving a driving force;
An oscillating gear having external teeth loosely fitted to the outer periphery of the eccentric cam portion, and an inner gear set to a greater number of teeth than the outer teeth of the oscillating gear and meshing with the outer teeth of the oscillating gear. A wheel having teeth and connected to the wheel, and an internal tooth having the same number of teeth as the external teeth of the oscillating gear and having the same diameter as the internal teeth of the wheel and meshing with the external teeth of the oscillating gear. And a fixed gear fixed non-rotatably to the vehicle body. A third aspect is that the driving force is transmitted from a manual ring rotated by a rider's hand.

[0004]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a vertical cross-sectional configuration diagram of a shaft portion of a wheel on one side of a wheelchair, and FIG. 2 is a schematic cross-sectional configuration diagram taken along line AA of FIG. 1 showing an arrangement state of a planetary gear type internal gear differential mechanism. is there.

In the figure, a shaft 3 is rotatably mounted in the center of a wheel plate 2 of a wheel 1 of a wheelchair.
An axle 4 is loosely inserted in the center of the wheelchair, and the axle 4 is provided between the left and right wheels 1 and 1 of the wheelchair. A curved arm 5 is provided around the left end of the shaft 3 in the figure.
Is provided with a manual ring 6 at the end thereof, and a driving force is generated when a person riding in a wheelchair turns the manual ring 6 by hand.

An eccentric cam portion 3a is integrally formed on the right end side of the shaft body 3 in the drawing, and an oscillating gear 8 having external teeth 8a on the outside is loosely fitted around the eccentric cam portion 3a. The internal teeth 9a formed inside the wheel 9 connected to the wheel plate 2 are meshed with the external teeth 8a of the swing gear 8, and the meshing state is shown in FIG. The left half of the external teeth 8a of the oscillating gear 8 meshes with the internal teeth 9a of the wheel 9, and the external teeth 8a of the oscillating gear 8 The internal teeth 10a are meshed with the right half in FIG. 1 of the external teeth 8a of the oscillating gear 8, and the external teeth 8a of the oscillating gear 8 , The wheel 9 and the rocking plate 10 are simultaneously meshed with the respective internal teeth 9a, 10a. It is. The fixed gear 10 is integrally engaged and fixed to a case 7 fixed to the vehicle body side of the wheelchair.
0 and is arranged so as to surround the outer circumference of the wheel 9,
The axle 4 is provided laterally in the case 7 so as to penetrate therethrough.

The number of internal teeth 9a of the wheel 9 is set to be slightly larger than the number of external teeth 8a of the oscillating gear 8, and the internal teeth 10a of the fixed gear 10 With the same number of teeth as the number of external teeth 8a of the oscillating gear 8, the outer diameter of the tooth profile is set to the same size as the outer diameter of the tooth profile of the internal teeth 9a of the wheel 9. When rotated at a high speed, the eccentric cam portion 3a formed on the right end side of the shaft body 3 also rotates at a constant speed,
The oscillating gear 8 engaged with the outer periphery of the eccentric cam portion 3a is rotated while sequentially meshing with the internal teeth 10a of the fixed gear 10 meshed with the external teeth 8a. However, since the number of the external teeth 8a of the oscillating gear 8 and the number of the internal teeth 10a of the fixed gear 10 are the same, the same teeth are always meshed with each other.
a around the outer peripheral axis, that is, rotation, is prevented.
Is performed around the center of the axis with the eccentric amount of the eccentric cam 3a as a radius, that is, only the revolution is performed at a constant speed.

As shown in FIG. 1, the left half of the external teeth 8a of the oscillating gear 8 is meshed with the internal teeth 9a of the wheel 9, and the revolving locus circular motion of the external teeth 8a of the oscillating gear 8. , And the rotation is transmitted to the wheel 9 by the difference in the number of teeth. At this time, the number of the internal teeth 9a of the wheel 9 is slightly larger than the number of the external teeth 8a of the swing gear 8, so that the
Is set to perform deceleration rotation corresponding to the gear ratio. Further, since the oscillating gear 8 is prevented from rotating, the rotational force from the wheel 9 is transmitted to the shaft body 3 via the eccentric cam 3a.
Can not be transmitted to. In this manner, the rotational force from the shaft 3 is transmitted to the wheel 9, but the eccentric cam 3 a of the shaft 3, the swing gear 8, the wheel 9, The fixed gear 10 is arranged to form a planetary gear type internal gear differential mechanism M.

That is, in the wheelchair of this embodiment, a planetary gear type internal tooth hysteresis mechanism M is incorporated in the shaft portion, and in such a wheelchair, a person riding in the wheelchair manually operates the manual ring 6. Is rotated in the forward direction, the driving force is transmitted to the shaft body 3 via the arm 5, the shaft body 3 rotates in the forward direction, and the rotation is loosely engaged with the eccentric cam portion 3a of the shaft body 3. The oscillating gear 8 revolves around the axle 4 while the rotation of the oscillating gear 8 is prevented from rotating because the fixed gear 10 meshing with the external teeth 8a cannot rotate.
The internal teeth 9a of the wheel 9 meshing with the a are decelerated and rotated in the forward direction, whereby the reduced driving force is transmitted from the wheel 9 to the wheel 1 via the wheel plate 2, and the wheel 1 is rotated in the forward direction. It will be.

As described above, since the swing gear 8 is prevented from rotating even when the forward movement is interrupted when the wheel 1 is moved forward, for example, when the vehicle 1 moves uphill, in the ascending direction, as described above, The rotational force from the wheel 1 is blocked by the fixed gear 10 and cannot be reversely rotated, and the planetary gear type internal gear differential mechanism M performs self-tensioning to prevent the wheelchair from retreating and apply a brake in the retreating direction. The state can be created automatically, so that the wheelchair does not retreat even if you stop moving forward on the uphill, and the wheelchair can hold the stopped state well even if the brake operation is delayed, and safety is improved. Is guaranteed.

In this embodiment, the planetary gear type internal tooth hysteresis mechanism M is illustrated only in the shaft portion of one of the wheels, but the planetary gear type internal tooth hysteresis mechanism M is mounted on the left and right sides of the wheelchair. Provided on each of the wheels to generate a more reliable self-tensioning action.

[0012]

According to the wheelchair of the present invention, the wheels are configured to rotate via a planetary gear type internal gear hysteresis mechanism.
The wheels can be turned forward and backward by a small force, and stop automatically when you release your hand. Therefore, even if you stop moving forward on an uphill road, you will not retreat, and you can accelerate even on a downhill road. And safety can be ensured.

Further, the planetary gear type internal tooth hysteresis mechanism includes a shaft body having an eccentric cam portion rotated by receiving a driving force, an oscillating gear having external teeth loosely fitted on an outer periphery of the eccentric cam portion. The number of teeth of the oscillating gear is set to be greater than the number of external teeth of the oscillating gear, and the internal gear is engaged with the outer teeth of the oscillating gear; It is connected to the wheel by being composed of a fixed gear that has the same number of teeth as the internal teeth of the wheel and has internal teeth that mesh with the external teeth of the oscillating gear and that is fixed non-rotatably to the vehicle body side The rotated wheel can be rotated with a small force, and the rotation of the wheel in the backward direction can be prevented well.

Further, since the driving force is transmitted from the manual ring which is rotated by the occupant's hand, a very small manual wheelchair in which the occupant rotates the manual ring by hand and moves forward. The vehicle can move forward and backward by force and stop automatically when the hand is released, so that the vehicle can be properly prevented from retreating on an uphill and stop moving forward on a downhill, thereby ensuring safety.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional configuration view of a shaft portion of a wheel on one side of a wheelchair.

FIG. 2 is a diagram showing an arrangement state of a planetary gear type internal gear hysteresis mechanism.
FIG. 2 is a sectional view taken along line AA of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wheel 2 Wheel plate 3 Shaft body 3a Eccentric cam part 4 Axle 5 Arm 6 Manual ring 7 Case 8 Oscillating gear 8a External teeth 9 Wheel 9a Internal teeth 10 Fixed gear 10a Internal teeth M Planetary gear type internal gear differential mechanism

Claims (3)

[Claims] 1. A wheelchair, wherein wheels are configured to rotate via a planetary gear type internal gear hysteresis mechanism. 2. The planetary gear type internal gear hysteresis mechanism includes a shaft body having an eccentric cam portion that is rotated by receiving a driving force, and an oscillating member having external teeth loosely fitted on an outer periphery of the eccentric cam portion. Gears,
A wheel which is set to a greater number of teeth than the external teeth of the oscillating gear and has internal teeth meshing with the external teeth of the oscillating gear and which is connected to the wheel; It is constituted by a fixed gear which is set to the same diameter as the internal teeth of the wheel with the same number of teeth, has internal teeth engaged with the external teeth of the oscillating gear, and is fixed non-rotatably to the vehicle body side. The wheelchair according to claim 1, characterized in that: 3. The wheelchair according to claim 2, wherein the driving force is transmitted from a manual ring rotated by a rider's hand.