JPS62134391A - Drive for pedal propulsion car - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a pedal-propelled drive device suitable for simple vehicles such as transport vehicles and wheelchairs.

<Conventional technology and its problems> Transport vehicles widely used for transporting materials in factories, and simple vehicles such as wheelchairs used for physically disabled or sick people, cannot be operated by a single worker or an attendant. It is common to drive by hand, and in the case of a wheelchair, it is also possible to drive by hand by operating the main wheels by the user himself. However, hand-cranked wheelchairs have problems in that they cause a lot of fatigue for the user, their hands are occupied while moving, and they are not suitable for people with hand disabilities. In addition to these human-powered vehicles, self-propelled simple vehicles equipped with battery-powered motors are also manufactured, but such self-propelled vehicles are generally expensive and heavy. There is a problem that the vehicle becomes large.6 The present invention was made with attention to this problem, and it provides a pedal propulsion system suitable for obtaining an inexpensive, lightweight, self-propelled simple vehicle that can be driven by depressing the pedals. The purpose is to provide a drive device for a vehicle.

Means for Solving the Problems> In order to achieve the above object, a drive device for a pedal-propelled vehicle according to the present invention includes a pair of left and right pedals that repeat reciprocating motion;
The hub includes a pair of left and right connecting members that independently transmit the depression force applied to each pedal to a hub, and a drive wheel supported by the hub. A hub axle fixed to the main body of the vehicle, a pair of left and right drive bodies rotatably supported by the hub axle and rotated in a forward direction and a backward direction by each of the connecting members, and a pair of left and right drive bodies rotatably supported by the hub axle. one hub shell, a pair of left and right forward one-way clutches that transmit the forward rotation of each drive body to the hub shell, and a pair of left and right forward clutches that transmit the reverse rotation of each drive body to the hub shell, respectively. The vehicle is equipped with a reverse one-way clutch, and a release member that selectively releases the rotation transmission action of each of these one-way clutches.

<Operation> In the present invention, the driving wheels are driven by the depression force applied to each pair of left and right pedals that repeatedly make reciprocating motion. The direction of rotation of the drive wheels can be arbitrarily selected between forward and reverse by selectively releasing the rotation transmission action of the forward one-way clutch and the reverse one-way clutch, and the rotation transmission action can be simultaneously released. For example, the driving wheels can be set in a free state, and a simple vehicle such as a transport vehicle or a wheelchair can be obtained, which can be driven by operating the pedals with two feet. In addition, by linking the left and right pedals so that they move in opposite directions and depressing them alternately, it is possible to apply continuous, uninterrupted driving force to the drive wheels, allowing pedal propulsion to run with a small pedal force. vehicle is obtained.

<Example> Next, a first example regarding the wheelchair shown in the drawings and a second example regarding the transport vehicle will be described.

(A) Overall schematic structure of the first embodiment FIGS. 1 and 2 are a side view and a plan view of a 1 m long structure with the sheet removed. In the figure, (1) is the main frame,
(2) is a manual operation unit formed above the rear part of the main frame (1), (3a) and (3b) are a pair of manually operated main axles attached to both sides of the rear part of the main frame (1), (4a)
) (4b) is a pair of flexible leg shafts attached to both sides of the front part of the main frame (1), and their basic structure is similar to that of a general wheelchair.

(5) is a drive mechanism provided at the bottom of the main frame (1), and includes an auxiliary frame (6), a hub part (7), a pedal part (8), chains (9a) (9b), etc. (10) is a drive wheel attached to this hub portion (7). Note that, although each wheel is of a spoke type, for example, spokes are not shown in any of the wheels. This drive wheel (10) is the main wheel (
3a) (3b), and as shown in Fig. 3, its grounding point (10') is connected to the main wheels (3a) (3b).
The grounding points (3a') and (3b') are arranged at exactly the midpoint of the interval between them.

(B) Structure of the steering mechanism The flexible leg shafts (4a) (4b) have a well-known structure in which the axle is supported at a position eccentric to the turning axis, but one of the flexible leg shafts (4a) In this case, a steering handle (93) is connected to a holding frame (82) that eccentrically supports the steering wheel, and this flexible leg shaft (4a) is used as a steering shaft. The steering handle (93) is located at the front upper part of the main frame (1) and can be easily operated by the user. Figure 4 shows this steering mechanism (81
) is shown below.

That is, a stud bolt (83) is vertically fixed to the upper end of the holding frame (82), a lower cone (84) is formed at the lower part of the stud bolt (83), and an upper cone (85) is formed at the upper part of the stud bolt (83), which is fixed to the lock nut (86). ), and press-fit the dog members (88) into the upper and lower ends of the pipe (87), which is fixed to the main frame (1) by appropriate means, and each cone (84) (
The stud bolt (83) is rotatably attached to the pipe (87) and therefore the main frame (1) by supporting the stud bolt (85) with the bowl member (88) via the ball (89). The other h-legged ring (4b) has the same structure up to this point, and this free leg shaft (4b) is simply a driven type free leg shaft.

As shown in FIG. 4(b), a non-circular protrusion (85a) is formed on the upper surface of the upper cone (85), and a connecting pipe (91 )
Fit the flange part (91a) of the connecting pipe (91)
By screwing the medium bolt (92) passed through the medium locking part (91b) of the connecting pipe (
91) and a stud bolt (83). Furthermore, the steering handle (9
Insert the stem (94) of 3) by the desired dimension, and then attach the thin member (95) at the tip of the stem (94) to the upper bolt (96).
The stem (94) is fixed to the connecting pipe (91) by pulling it apart and expanding the tip of the stem (94) from the inside. Thereby, the steering handle (93) is connected to the holding frame (82), and the direction of the flexible leg shaft (4a) can be controlled by operating the steering handle (93).

Note that the steering handle (93) is not annular as shown in the figure, but may have another shape, such as a bar shape. Moreover, this steering mechanism (81) can also be provided on the other free leg shaft (4b) if necessary.

(C) Operation of Steering Mechanism Next, the operation of the steering mechanism (81) mentioned above will be explained.

FIG. 5 shows the free leg shafts (4a) and (4b) viewed from above. Now, if you turn the steering wheel (93) counterclockwise, for example, the flexible leg shaft (4a) will rotate counterclockwise around the axis of the stud bolt (83), and the wheelchair will move to the left while traveling. bend to the free leg axis (4b
) follows this and rotates counterclockwise, allowing steering to the left without any problem. The solid line in FIG. 5(b) shows this state. Also, on the contrary, the steering wheel (93)
When you turn clockwise, the flexible leg shaft (4a) rotates clockwise as shown by the chain line, and following this, the flexible leg shaft (4b) also rotates clockwise, allowing you to steer to the right. It is done without any problems. The above is an explanation of the case where the steering operation is performed while the vehicle is moving forward, but the same steering operation is possible even when the vehicle is moving backward.

Note that if both of the pair of front wheels are swivel axles as in this embodiment, the steering operation is possible even when the vehicle is stopped. That is, when the steering wheel (93) is turned counterclockwise, for example, while stopped, the free leg shaft (4a) moves to its grounding point (4a').
) around the main frame (1) as a fulcrum.
The front part of the is swung to the left.

For this reason, the other free leg shaft (4b) is also attached to the stud pole 1.
~(83) moves to the left, so its grounding point (4b
') as a fulcrum and rotates counterclockwise.
) will face in substantially the same direction as the free leg axis (4a), which is the steering wheel. Therefore, the wheelchair starts traveling while turning left from the beginning of the RL.

That is, the free leg shaft (4b), which is not a steering shaft, can be connected to the steering handle (9) even if a steering connection mechanism is not particularly provided.
In response to the operation 3), the direction changes in the same direction following the free leg axis (4a) which is the steering axis, and a certain degree of steering operation is possible not only while traveling but also while stopped. Therefore, a user sitting in a wheelchair can arbitrarily steer the vehicle when traveling using the drive mechanism described later, and can also use the main axle (3a) during coasting when traveling with one hand.
b) It also becomes possible to steer the vehicle without operating it, or to change direction at will when the vehicle is being pushed by an attendant. In addition, in Fig. 5(b), the left and right free leg axes (4a) and (4b) are drawn in parallel, but when actually traveling, the free leg axes (4b) will move according to the difference in turning radius. This automatically follows the rotation angle while maintaining a rotation angle that is slightly different from that of the free leg axis (4a).

CD) Structure and operation of the hub portion FIGS. 6 to 11 show an example of the hub portion (7), which is one of the components of the drive mechanism (5).
(11) is a hub shell, (12a) and (12b) are sprockets, and (13a) and (13b) are drive bodies.

The hub shell (11) has a cylindrical shape, each having a collar (17) with spoke holes (16) at both ends of its outer diameter, and the drive wheel (10) is connected to the hub shell (11) by spokes (20). Drive bodies (13a) (13b) are inserted into this hub shell (11) from both ends, and the hub shell (11)
A bearing ball (21) is inserted between the bearing races formed at the entrances of both inner diameter ends of the drive bodies (13a and 13b) and the bearing races formed at the intermediate outer diameter portions of the driving bodies (13a) and (13b), and the bearing balls (21) are rotatably supported.

The drive bodies (13a) (13b) have their centers aligned with the hub shaft (22).
) is penetrated, and a bearing ball (24) is inserted between the bearing race formed at the entrance at both ends of the inner diameter and the bearing race of the cone (23) screwed onto the hub shaft (22), so that it can rotate freely. The large diameter part of the end is supported by the hub shell (1
1) protrudes to the outside from both sides, and a sprocket (
12a') (12b) are fixed. Hub axle (
22) is attached to the auxiliary frame (6) in the same way as a normal bicycle.
), and the auxiliary frame (6) is fixed to the main frame (1).
are fixed accordingly.

(35a) (35b) is a part of the ratchet 1 for advancement provided on both ends of the inner peripheral surface of the hub shell (11); (130
a) (130b) is a retraction ratchet part provided on the inner peripheral surface of the hub shell (11) in parallel with and in the opposite direction to the ratchet parts (35a) (35b); (36a) (36
b) is disposed in the groove formed in the drive body (13a) (13b) and is pivotally attached by a pin (37), and the drive body (13
When the ratchet part (35a) (aH13b) rotates forward, the ratchet part (35a) (
: 115b) to transmit the driving force by engaging with the claw, (131a
) (131b) is a pawl that is similarly pivoted by the pin (37) and engages with the ratchet portions (130a) (130b) to transmit driving force when the drive bodies (13a) (13b) are reversed. These claws (36a) (36b) and claws (1
31a) and (131b) are provided with springs (38) and (132), respectively, which bias rotational force in the engagement direction, but springs (3g) and (132) are not shown in FIG. , as shown in FIGS. 9 to 11. In addition, winter melon (3
6a) (36b) (131a) (131b) are provided symmetrically in pairs, but only one of them is shown in Figures 9 to 11. (1:15a)
135b) are the ratchet part (35a) and the pawl (3), respectively.
6a), and ratchet part (35b) and pawl (36b)
It shows a forward one-way clutch consisting of (13
6a) (136b) are ratchet parts (130a), respectively.
), pawl (131a), and ratchet part (130b)
This shows a one-way reverse clutch consisting of a claw (t3tb) and a pawl (t3tb).

(133a) (133b) is a slider that is slidably inserted into the hub axle (22), (40) is a slider (
133a) and (133b) are return springs, and (41) is a control lever that operates the slider (1:13a) (133b). Slider (133a) and (133b
) are claws (36a) (131a) and (36b), respectively.
) (131b), and the slider (133a) is provided with two large diameter portions (133a') corresponding to the spacing between the claws (36a) (131a).
Also, the slider (133b) has a claw (36b) (13
1b) One large diameter part (13:ll) with a length matching the interval of
b') is provided.

The hub shaft (22) is provided with a through hole (22c) through which the rods (42-1) and (42-2) are inserted, and each end of the rod (42-1) and (42-2) is connected to the hub. shaft(
22) through the elongated holes (22a) (22b) in the diametrical direction.
) are provided, and sliders (133a) (133b)
Bottles (43a) (43b) passing through the rods (43a) (43b) in the diametrical direction are inserted into the elongated holes (22a) (22b), respectively, and the tips of the rods (42-1) (42-2) are inserted into the bins (43a) (
43b). The control lever (41) is attached to the bracket 1-(44) by a shaft (45), and its tip is in contact with the head of the rod (42-1). By pushing the rods (42-1) (42-2) against the force of the spring (40), the sliders (133a) (133b) move into the elongated holes (2).
2a) It is possible to move within the range according to (22b). In addition, (46) is an intermediate collar fitted into the central part of the hub shaft (22), and the driver (13a) (13
b) It supports the inner end surface portion of the bottle (37) and prevents the bottle (37) from coming out. This intermediate collar (46) can also be formed integrally with the hub axle (22).

FIG. 6(a) shows sliders (133a) (133b)
is located on the left side of the figure and is a one-way forward clutch (13
5a) (135b) is inserted, and the large diameter part (133a) of the slider (133a) (1:J:lb)
a') (133b') is the claw (36a) (36b
). Therefore, the claw (36a) (
36b) to the ratchet part (35a) as shown in Figure 9(a).
) (35b), while the claw (1:31a) (
Push the rear end of this claw (131a) (13
1b) is tilted, and the engagement with the ratchet parts (130a) (130b) is released as shown in (b) of the figure. Therefore, the forward rotation of the drive bodies (13a) (13b) also causes the hub shell (11) to rotate forward, and the wheelchair moves forward. Also.

Even when the drive bodies (13a) and (13b) stop or rotate in reverse, the hub shell (11) can continue to rotate forward, allowing coasting without any problems, and making it possible to drive by hand or push by hand without using pedals. Of course, running is also possible.

Furthermore, although the pedal portion (8) has a structure that allows the pedal to reciprocate as will be described later, there is no problem with this reciprocating movement of the pedal.

In Fig. 6(b), the control lever (41) is rotated clockwise to push in the rods (42-1) and (42-2), and the sliders (133a and 133b) are positioned to the rightmost position for reversing. One-way clutch (136a) (136b
) is included. That is, as shown in FIG. 10, at this time, the large diameter portion (133
a') (133b') is the claw (131a) (13
1b), and this claw (131a)
(131b) is ratchet 1 part (130a) (1:
1Ob). Therefore, the driving body (13a)
By the reverse rotation of (13b), the hub shell (11) rotates in the opposite direction, making it possible to move the wheelchair backwards, and of course, coasting backwards, hand-cranking or hand-pushing without using pedals is possible. It is.

By the way, when the left and right pedals are interlocked so that their reciprocating motions are performed in opposite directions, as in the embodiment shown in FIG.
If you try to reversely rotate the left and right sprockets at the same time when 135a) (135b) is engaged, the left and right pedals will try to move in the opposite direction and push against each other, making it impossible to rotate the two sprockets simultaneously in reverse. In this state, it is impossible to retreat and it is inconvenient.

Therefore, in this embodiment, the slider (133a) (13
3b), disengage all clutches and remove the hub shell (1).
1) is in a free state, allowing forward and backward movement without pedal operation.

Figure 6(c) shows this state, and the rod (
42-1) and (42-2) are pushed to the intermediate position, and both the forward and reverse one-way clutches are disengaged. That is, the slider (133a) (133
b) is in the middle position, and the large diameter part (
133a') (133b') has all the pawls tilted to release the engagement with each ratchet part. Therefore,
The hub shell (11) is separated from the drive mechanism and becomes free, allowing it to rotate freely.

The clutch lever (30) shown in FIGS. 1 and 2 controls the angle of the control lever (41) to move forward and backward as described above.

It is provided to arbitrarily switch between three types of free states, and it consists of a clutch lever (30) and a control lever (
41) by a wire (31).

In addition, the large diameter part (133a') (133b') and the claw (3
The surfaces where 6a) (36b) and (131a) (131b) come into contact with each other are tapered, and the slider (13
3a) (133b) to ensure smooth movement.

Further, (32) shown in FIGS. 1 and 2 is a brake lever, and a brake (34) operated via a wire (33) is provided on the drive wheel (10). These brake mechanisms can be those for ordinary bicycles, and are provided separately from a brake mechanism (not shown) of the type that presses down the tires of the main wheels that are generally provided in wheelchairs.

(E) Structure and operation of pedal section FIG. 12 shows an embodiment of a pedal section (8) that generates driving force, and this will be explained below.

(51) is a closed gear box provided at the lower front of the main frame (1) (not shown), and two gears (52a) and (52b) are meshed within the gear box (51). ,gear(
Crankshaft (53a) with 52a) (52b) attached
(53b) on both sides of the gear box (51).
4) to protrude left and right in opposite directions, and attach sprockets (55a) (55b) and cranks (55b) to the protruding ends.
56a) Fix (56b) and crank (56a)
Pedals (8a) and (8b) are attached to the tips of (56b), respectively. Sprocket (55a) (55b)
A long arc-shaped hole (57) is provided between the bottom and the center of each tooth, and when combined with a spindle pin (58) protruding from the gear box (51), the crank (56a)
(56b) can rotate within a certain range including the horizontal direction, and the sprockets (55a) (55b) and the sprockets (12a) (12
Between b) and t, drive chains (9aH9b) are respectively hung.

In this embodiment, the left and right cranks (511; a) (56
b) are interlocked, so the elongated hole (57) only needs to be on one of the sprockets (55a) (55b), and such rotation range regulation is limited to 1, for example, the gear (52a) (55b).
This can be done by other means, such as by providing 2b) with a non-toothed portion.

The pedal section (8) of this embodiment has such a configuration, and when one of the left and right pedals (8a) (8b) is depressed, the other goes up, so by alternately stepping on these pedals, the driving force is transferred to the chain. (9a) (9b) to the hub part (7), and the drive body (13a) (13b) of the hub part (7)
) are alternately driven in the forward and reverse directions to rotate the hub shell (11), that is, the drive wheel (10), and the wheelchair can be moved forward or backward depending on the operation of the clutch lever (30). It is. At this time.

Since the pedals (8a) and (8b) reciprocate in a direction perpendicular to the direction of depression, that is, in this example, within a certain range including the horizontal direction, the pedals (8a) and (8b) reciprocate within a certain range, including the horizontal direction, so that the pedals (8a) and (8b) can efficiently and uninterruptedly generate driving force. can be converted to . In addition, the range of movement of the legs at this time is smaller than that of a normal bicycle, where the trajectory of the pedals follows a circular path, and moreover, it is sufficient to simply step on the pedals alternately without being aware of the rotation, so it is similar to using a wheelchair. It is possible to run it with sufficient leg strength.

(F) Structure and Operation of Second Embodiment FIGS. 13 and 14 show an embodiment of a bicycle-type transport vehicle having two front wheels.

One of the direction variable wheels (204a) (204b) provided on both sides of the front part of the main frame (201) is a holding frame (2g
2a) is eccentric free leg shaft, the other is maintenance I, 1 frame (2
82b) is a non-eccentric steering wheel, and a driving wheel (210) is provided at the rear of the main frame (201).

The variable direction wheels (204a) (204b) are attached to the main frame (201) with a structure similar to that of the first embodiment explained in FIG. , the steering handle (293) is connected to the steering mechanism (211) by a structure similar to that shown in FIG.
11). [The drive mechanism (205) that drives the driving wheels (21Q) includes a hub part (207), a pedal part (2
08) etc. This hub part (207) has the same structure as the hub part (7) explained in FIGS. 6 to 11, and the pedal part (208) has the same structure as the hub part (7) explained in FIG. 12. The same structure as (8) is used, and the pedal force applied to the pedals (208a) (208b) is controlled by the chain (2Q9a) (209
b) to the hub section (207). (23
Clutch lever 1 (232) operates the clutch of the hub part (7) via the wire (231).
233) to operate the brake (234).

This embodiment is configured as described above, and the user places the luggage (301) on the platform (300) and pedals (8a).
) (8b) to drive. Forward, backward, and free switching can be performed arbitrarily by operating the clutch lever (230), and the steering wheel (29:
3) to operate the variable direction wheel (204b) which is the steering axis.
If you change the direction, the flexible leg shaft (204a) will follow this and change direction in the same direction, so you can move in any direction.

<Effects of the Embodiment> As described above, the wheelchair of the first embodiment is equipped with a one-pedal type drive mechanism (5), and has left and right hand-operated main wheels (
3a) It is a self-propelled wheelchair with a drive wheel (10) provided between (3b). The user depresses the pedals (8a) (8b) and operates the steering wheel (93) to
It is possible to run in any direction, and it is also possible to coast or operate the brakes using the brake lever (32). Also, by operating the clutch lever (30), the drive wheel (10)
It can also be used in the same way as a regular wheelchair by cutting off the pedals, or by pressing the pedals to move backwards. In addition, the grounding point of the drive wheel (lO) is the main wheel (3
a) Since it is located in the center of the grounding point in (3b),
Since the driving force is applied to the center without being biased to the left or right, good straight-line performance is obtained, and when changing direction, the same driving force is applied to both the left and right, allowing for smooth turns, and the drive wheels (10) are not driven. Even when the vehicle is driven by hand, the drive wheels (10) are located in the center, so there is no need for either the left or right side to be heavy or to get in the way of changing direction.

Note 1: In the case of a normal wheelchair, the user has no opportunity to use his or her legs at all, but in this example, the force required to press the pedals is small and the wheelchair can be moved easily, so the user can use his or her legs. This provides a wheelchair that can be used for rehabilitation of disabled people.

In addition, the transport vehicle of the second embodiment runs by driving a single drive wheel (210) provided at the rear by a one-pedal drive mechanism (205), and a steering wheel (293).
) can be used to turn in any direction, and also to move backwards, allowing it to be used as a small-turning transport vehicle. Particularly in underground mines where fire must be avoided as the power is powered by foot pedals.

A transport vehicle suitable for use in a closed workplace where exhaust gas should be avoided can be obtained.

<Effects of the Invention> As is clear from the description of the above-mentioned embodiments, the drive device for a pedal-propelled vehicle of the present invention drives one drive wheel by the depression force applied to a pair of left and right pedals that repeat reciprocating motion. However, the rotational direction of the drive wheels can be arbitrarily selected by selectively releasing the rotation transmission action of the forward one-way clutch and the reverse one-way clutch, and at the same time, the rotation transmission action can be released to free the drive wheels. It is designed so that it can be used in the following situations. Therefore, it is possible to obtain an inexpensive and lightweight self-propelled simple vehicle such as a transport vehicle or a wheelchair that runs by operating the pedals with one foot without using mechanical power such as a motor. In addition, if the left and right pedals are linked so that they move in opposite directions and are stepped on alternately, it becomes possible to continuously apply driving force to the drive wheels without interruption, allowing the vehicle to drive with a small pedal force. Moreover, by operating the clutch, forward, backward, and free states can be arbitrarily selected, making it possible to obtain an easy-to-use pedal-propelled vehicle.In particular, when applied to a wheelchair, the wheelchair can be made suitable for people with disabilities who lack the strength to use one leg. This makes it easier to provide.

[Brief explanation of drawings]

1 to 12 show a first embodiment of the present invention. FIG. 1 is a side view with the seat removed, FIG. 2 is an open plan view, and FIG. 3 is a diagram showing the relationship between the drive wheels and the main wheels. (a) and (b) of FIG. 4 are a partially cutaway side view and a plan view of the upper cone of an embodiment of the steering mechanism, and (a) of FIG.
and (b) is an explanatory diagram of the operation of the steering mechanism. Figures 6 to 11 show an example of the structure of the hub part, Figures 6 (a) to 6 (c) are partially cutaway views, and Figure 7 is a broken plane of the main part. 8 are plan views of the same hub axle, and FIGS. 9 to 11 are explanatory views of the operation. Figure 12 shows an example of the structure of the pedal section. (,) is a side view, (b) is a front view, and (C) is a partially cutaway plan view taken along line CC in figure (b). 13 and 14 show a second embodiment, with FIG. 13 being a side view and FIG. 14 being a plan view. (3a) (3b) - main wheels, (3a') (3b
') - grounding point, (5) (205)... drive w1 structure,
(7) (207)...Hub part, (8) (208)
...Pedal section, (8a) (8b) (208a) (2
08b) - Pedal, (9a) (9b) (209a)
(209b) - Chain (connecting member), (10) (
210)... Drive wheel, (10')... Grounding point, (
11)...Hub shell, (13a') (13b)"
・Driver, (22)...Hub axle, (35a) (35b
) (130a) (130b) - Ratchet part, (3
6a) (36b) (1:111a) (131b)-
Claws, (133a) (133b) - Slider (release member), (133a') (133b') - Large diameter part, (1
35a) (1:15b) - Forward one-way clutch, (
136a) (136b)...One-way clutch for reverse.

Claims (6)

[Claims] (1) A pair of left and right pedals that repeat reciprocating motion, a pair of left and right connecting members that independently transmit the depression force applied to each pedal to a single hub part, and a pair of left and right pedals that are supported by the hub part. a pair of left and right drive wheels, the hub portion comprising: a hub axle fixed to the main body of the vehicle; and a pair of left and right wheels rotatably supported by the hub axle and rotated in forward and backward directions by the respective connecting members. a driving body, one hub shell rotatably supported by the hub shaft, a pair of left and right forward one-way clutches that transmit forward rotation of each of the driving bodies to the hub shell, and each driving body. A pedal comprising: a pair of left and right reverse one-way clutches that respectively transmit rotation in the reverse direction of the pedal to the hub shell; and a release member that selectively releases the rotation transmission action of each of the one-way clutches. Drive system for propulsion vehicles. (2) Each driving body is rotatably supported by the hub shaft, the hub shell is rotatably supported by each of these driving bodies,
2. The drive device for a pedal-propelled vehicle according to claim 1, wherein each one-way clutch is comprised of a ratchet portion formed on the inner circumferential surface of the hub shell and a pawl provided on the drive body. (3) The release member that releases the rotation transmission action of each one-way clutch is a slider that is slidably inserted into the hub shaft, and by controlling the position of this slider, a large 3. The drive device for a pedal-propelled vehicle according to claim 2, wherein the pawl is tilted at the diameter portion to selectively release the engagement between the pawl and the ratchet portion. (4) The drive device for a pedal-propelled vehicle according to claim 1, 2, or 3, wherein the pair of left and right connecting members that transmit the depression force applied to each pedal to the hub portion are chains. (5) A patent in which a pair of left and right pedals that repeat reciprocating motion are linked so that they move in opposite directions, so that when one drive body rotates in the forward direction, the other drive body rotates in the backward direction. A drive device for a pedal-propelled vehicle according to claim 1, 2, 3, or 4. (6) The vehicle is a wheelchair equipped with a pair of manually operated main wheels on the left and right, and a driving wheel is provided between the main wheels, and the grounding point of the driving wheel is on the main wheel. Claim 1 arranged so as to be located at the center of the grounding point
A drive device for a pedal-propelled vehicle according to item 1, 2, 3, 4, or 5.