JP2000264213A - Power-driven monowheel dolly - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power-driven monowheel dolly of simple confuguration at a low cost capable of running with power both in the forward and reverse direction. SOLUTION: A power-driven monowheel dolly is furnished with one driving wheel 12 in the center of vehicle across the width, and the vehicle is equipped with a motor 13 to drive the wheel 12 through a power transmitting mechanism 14. The power transmitting mechanism 14 includes a forward-reverse changeover mechanism 90 in the neighborhood of the axle 81 bearing the wheel 12, wherein the changeover mechanism 90 changes over the wheel operation between the forward and reverse.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a powered single wheel carrier.

[0002]

2. Description of the Related Art Hand-operated single-wheeled or two-wheeled vehicles, which are commonly called "cat cars" (cats), are used in various places such as construction sites and agricultural lands because they are small and turn around. . However, in such a one- and two-wheeled vehicle having such a simple structure, a heavy burden is imposed on an operator who carries heavy objects or climbs uphill. In order to reduce the burden on the worker, it is conceivable to make the one- and two-wheeled vehicles run on their own with the power of an engine or the like. As such a vehicle, for example, Japanese Utility Model Publication No. 51-25250, "Motorized Wheeled single-wheeled vehicles ".

According to the prior art described above, according to FIG. 1 of the publication, a prime mover 25 (numbers quoted in the publication; the same applies hereinafter), a speed reducer 23 and a driving roller are applied to a single wheel carrier. The power unit 21 includes a power unit 21 capable of swinging up and down, and the wheels 3 are optionally rotated by the power of the prime mover 25. When the self-propelled wheeled vehicle is driven by itself, the drive roller 21 is pressed against the outer peripheral surface of the wheel 3 by depressing the clutch pedal 27 and swinging the power unit clockwise, and the wheel 3 is rotated by the power of the motor 25. Run forward. When the single wheel carrier is manually pushed, the drive roller 21 is separated from the outer peripheral surface of the wheel 3 by operating the clutch lever 39 and swinging the power unit counterclockwise. As a result, the vehicle can be manually pushed forward or backward.

[0004]

In a construction site or a greenhouse, the work space is narrow and the road surface has irregularities and undulations. In order to reduce the labor, there are times when it is desired to make the hand-operated single-wheeled vehicle run with power even during backward running, as in forward running. For example, when transporting crops or the like in a field, it is more likely to travel backward than to travel forward, and it is preferable to drive the vehicle at the time of forward travel and reverse travel in order to reduce labor.

[0005] However, the above-mentioned prior art uses an engine whose output shaft can rotate only in one direction as the motor 25, and is a hand-carried single wheeled vehicle with a motor that can run by itself only during forward running. On the other hand, it is conceivable to replace the prime mover 25 with a motor capable of rotating forward and reverse. In this case, a rotation switching device for electrically switching the rotation direction of the motor is required. However, when the rotation direction of the motor is frequently switched electrically, the starting load acts on the motor more frequently than when the motor is used only in one direction. Therefore, a motor one rank larger must be used. I can't get it. Moreover, if the rotation direction of the motor is electrically switched by the rotation switching device, the control system becomes complicated. For these reasons, the motor and the control system become expensive, and it is not always advantageous, and there is room for improvement.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a low-cost one-wheeled vehicle with a simple structure that can be driven by power both forward and backward.

[0007]

According to one aspect of the present invention, there is provided a vehicle having one drive wheel in a center portion of a width of a vehicle.
In a single wheel carrier equipped with a drive source for driving the drive wheels of the vehicle via a power transmission mechanism, the power transmission mechanism mechanically moves the drive wheels forward and backward near an axle supporting the drive wheels. A forward / backward switching mechanism for switching is provided.

A power transmission mechanism for transmitting power from a driving source to driving wheels is provided with a forward / reverse switching mechanism, and the forward / backward switching mechanism mechanically switches the driving wheels between forward and reverse. Even if the drive source is an engine, the drive wheels can be switched between forward and reverse. In addition, even when the drive source is a motor and the forward / backward operation is frequently repeated, the rotation direction of the motor is not changed. No problem. Since the forward / reverse switching mechanism is arranged near the axle, the power single wheeled vehicle is relatively small.

According to a second aspect of the present invention, the forward / reverse switching mechanism rotatably mounts a forward driven bevel gear and a reverse driven bevel gear on an axle supporting a wheel so as to face each other. A drive bevel gear driven by a drive source is meshed, a forward clutch and a reverse clutch are provided on opposing surfaces of the forward and backward driven bevel gears, and a radially protruding clutch pin is provided in the middle of the axle in the longitudinal direction. Movably mounted along
This clutch pin is resiliently repelled toward the end of the axle by an elastic member, and a bottomed vertical hole concentric with the axle is provided on the end surface of the axle,
The shift rod is fitted into this vertical hole so as to be able to move forward and backward, and the insertion end of this shift rod is brought into contact with the clutch pin, so that the clutch pin is moved in the same direction by the forward and backward movement of the shift rod. Is selectively applied to the forward clutch nail or the reverse clutch nail.

[0010] By moving the shift rod forward and backward, the clutch pin is moved in the longitudinal direction of the axle to selectively engage the forward clutch pawl or the reverse clutch pawl, and the power of the driving source is supplied to the driven driven bevel gear or the reverse. The driven wheels can be transmitted from the driven bevel gear to the axle to drive the drive wheels forward or backward. Since the clutch pins projecting radially from the axle are directly hooked on the forward clutch claws or the reverse clutch claws, the number of parts constituting the clutch is small, and the structure of the clutch can be simplified. Therefore,
The forward / reverse switching mechanism has a relatively simple configuration.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. Note that "before", "after",
“Left”, “right”, “up”, and “down” follow the direction seen from the worker, where Fr is the front side, Rr is the rear side, L is the left side, R is the right side, and CL is the vehicle width center (body center). Is shown. Also, the drawings should be viewed in the direction of reference numerals.

FIG. 1 is a perspective view of a power single wheel carrier according to the present invention. The single-wheeled power vehicle 10 has only one wheel 12 mounted at the center of the vehicle body frame 11 in the vehicle width direction. The motor 13 and the power transmission mechanism 14 for transmitting the power of the motor 13 to the wheels 12 are mounted on the vehicle body frame 11 and the left and right batteries 15L , 15
R, the left and right operation handles 16L, 16R are extended rearward from the body frame 11, and left and right ground stands 17L, 17R are provided at the lower rear portion of the body frame 11.
The loading bed 18 and the loading fence 1 are located above the body frame 11.
This is a walk-type, hand-operated, single-wheeled electric vehicle (commonly referred to as a “cat car”) to which the vehicles 9 and 19 are attached.

The powered single wheel carrier 10 is a carrier that can be manually pushed by lifting the left and right operation handles 16L and 16R so that the ground stands 17L and 17R are lifted from the ground. Left and right operation handles 16L, 16
R is a bar handle extending rearward and upward from the vehicle body frame 11, and has grips 21L and 21R attached to its ends. Further, the left operation handle 16L includes the brake lever 22, and the right operation handle 16R includes the operation lever mechanism 30.

FIG. 2 is a side view of the power single wheel carrier according to the present invention. The power transmission mechanism 14 includes a first reduction mechanism 50 connected to the motor 13 as a driving source, and a first reduction mechanism 50.
, And a second reduction mechanism 70 connected to the transmission shaft 68. The transmission mechanism is a shaft drive type transmission mechanism. The transmission mechanism transmits the power of the motor 13 to the drive wheels via the axle 81. Is transmitted to the wheels 12. The first reduction mechanism 50 reduces the rotation of the motor 13, and the second reduction mechanism 70 further reduces the output rotation of the first reduction mechanism 50 and transmits the output rotation to the axle 81. The first reduction mechanism 50 is disposed near the motor 13,
The second reduction mechanism 70 is arranged near the wheel 12. The axle 81 is a shaft that supports the wheels 12. The body frame 11 includes a motor bracket 24 for mounting the motor 13 with a speed reducer, and left and right axle brackets 25L and 25R for mounting the second reduction mechanism 70 and a bearing described later.

FIG. 3 is a plan view of the single-wheeled power vehicle according to the present invention, in which the wheels 12 are arranged at the center of the vehicle width of the body frame (the center in the vehicle width direction) CL, and the two batteries 15L, 15R
Are arranged on the left and right sides of the vehicle body frame 11, and the motor 13 is arranged on the right side from the vehicle width center CL. The vehicle body frame 11 has a key switch 27 and a battery level indicator 28 mounted on a mounting plate 26 at the rear, and a potentiometer 40 mounted below the carrier 18.

FIGS. 4 (a) and 4 (b) are diagrams showing the construction and operation of the operating lever mechanism and potentiometer according to the present invention. As shown in (a), the operation lever mechanism 30 is configured such that the operation lever 33 is attached to the case 31 via the shaft 32, the thumb F of the right hand H is put on the operation lever 33, and the operation lever 33 is turned clockwise in FIG. 34 is pulled from left to right in the figure, and has an automatic return mechanism.

The potentiometer 40 is a variable resistor in which a lever 43 is attached to a case 41 via a shaft 42. By turning the lever 43 with a throttle wire 34, the shaft 42 rotates and a built-in slide (not shown). The shaft 42 is provided with an auto return mechanism for moving a contact point. The auto return mechanism plays a role of always returning the shaft 42 to the neutral position. The potentiometer 40 is directly connected to the motor 13 shown in FIG. 1, and the potentiometer 40 controls the voltage of the motor 13.

(A) When the operating lever 33 is rotated clockwise in the drawing from the neutral state by the thumb F, the lever 43 of the potentiometer 40 rotates clockwise as shown in FIG. Generates a supply voltage according to the amount of rotation. As a result, the supply voltage to the motor 13 increases.
Thereafter, when the thumb F is removed from the operation lever 33, the operation lever 33 returns to the position (a) by the action of the attached auto return mechanism, and returns the throttle wire 34. As a result, the potentiometer 40 also returns to the neutral position (a) by the action of the attached auto return mechanism, and the supply voltage is reduced to zero. The motor 13 stops when the supply voltage is zero, and rotates at a high speed as the supply voltage increases.

FIG. 5 is a cross-sectional view of the power transmission mechanism according to the present invention, showing the connection relationship between the first reduction mechanism 50, the transmission shaft 68, the second reduction mechanism 70, and the axle 81. First reduction mechanism 50
Is the first small gear 5 connected to the output shaft 13a of the motor 13.
1, a first large gear 52 that meshes with the first small gear 51, an intermediate shaft 53 that spline-connects and supports the first large gear 52, and a second shaft that is connected to the intermediate shaft 53 via a bidirectional clutch 54. A second small gear 55 meshing with the second small gear 55;
A large gear 56, a bearing 57 for rotatably supporting the second large gear 56, a housing 58 for accommodating the gears 51, 52, 55, 56, the intermediate shaft 53, the bearing 57, and the like, and a lid 59. This is a two-stage speed reduction mechanism.

The bidirectional clutch 54 includes (1) the motor 13
When the motor 13 is rotated, power can be transmitted from the intermediate shaft 53 to the second small gear 55, and (2) a clutch mechanism that enables the second small gear 55 to rotate bidirectionally when the motor 13 is stopped. Power transmission from the second small gear 55 to the intermediate shaft 53 is not possible. The presence or absence of the bidirectional clutch 54 is optional. The second large gear 56 is connected to one end 6 of the transmission shaft 68.
8a is spline-coupled and the housing 5
The brake mechanism 61 is mounted on a hub 56a protruding from the hub 8. In the figure, 62 and 63 are bearings.

The second reduction mechanism 70 includes a transmission shaft 68 and an axle 81 which are arranged crossing each other, and the other end 6 of the transmission shaft 68.
A small bevel gear (drive bevel gear) 71 spline-coupled to 8b, and two large bevel gears (forward driven bevel gear 72 and reverse driven bevel gear 73) rotatably mounted near one end 81a of axle 81 so as to face each other;
Housing 7 for housing these bevel gears 71 to 73
4, a drive shaft bearing 75 that supports the vicinity of the other end 68b of the transmission shaft 68, a first bearing 76 that supports one end 81a of the axle 81, and a second bearing 77 that supports the middle of the axle 81. This is a one-stage gear reduction mechanism.

The axle 81 has the other end 81b supported by a bearing 82, and the wheel 12 connected to the center in the longitudinal direction by a pin 83. The wheel 12 and the axle 81 can rotate integrally. By the way, the power transmission mechanism 14 is provided with a forward / reverse switching mechanism (forward / reverse switching clutch) 90 that mechanically switches the wheels 12 between forward and reverse in the vicinity of the axle 81.

FIG. 6 is a sectional view of the second speed reduction mechanism according to the present invention, and shows the second speed reduction mechanism 70 shown in FIG. 5 in an enlarged manner. The other end 68b of the transmission shaft 68 is attached to the second reduction mechanism 70 so as to be immovable in the axial direction by a retaining ring 78 or a step of the shaft. One end 81a of the axle 81 is attached to the second reduction mechanism 70 so as to be immovable in the axial direction due to a step of the shaft. Driven bevel gears 72, 73 for forward and backward travel
Are rotated in opposite directions by meshing with the drive bevel gear 71.

The housing 74 is formed by stacking two symmetrical housing halves 74A and 74B together, forming a box shape, and fixing them with four bolts and nuts 79 (only one is shown in this drawing). It is. Since the two symmetrical housing halves 74A and 74B are combined,
The assembly of the second reduction mechanism 70 is easy.

Next, the forward / reverse switching mechanism 90 will be described. The forward / reverse switching mechanism 90 includes a forward clutch pawl 9 integrally formed with the forward / reverse driven bevel gears 72 and 73.
1 and the reverse clutch claws 92 and the forward clutch claws 9
The basic configuration is a combination of a clutch pin 93 that selectively engages the first or reverse clutch pawl 92, a shift rod 94 that operates the clutch pin 93, and a compression spring 95 that resiliently pushes the clutch pin 93 toward the shift rod 94. .

More specifically, the axle 81 has one end 8
A vertical hole 81d is formed in the end surface 81c of the shaft 1a and concentrically with the axle 81, and a through hole 8 penetrating radially in the middle of the longitudinal direction.
1e is opened. The vertical hole 81d is a round hole with a bottom. The through hole 81e is a long hole that is long in the longitudinal direction of the axle 81 and crosses the vertical hole 81d.

The clutch pin 93 is a round bar longer than the axle diameter, and is fitted into the through hole 81e so as to be movable in the longitudinal direction of the axle 81 but not in the circumferential direction of the axle 81. The position of the through hole 81e is an intermediate position between the forward / reverse clutch claws 91 and 92. The width of the through hole 81e in the longitudinal direction of the axle 81 is large enough to allow the clutch pin 93 to move so as to hang on both the forward / reverse clutch claws 91 and 92.

The shift rod 94 is a round bar fitted into the vertical hole 81d so as to be able to advance and retreat, and the insertion end 94a is brought into contact with the peripheral surface of the clutch pin 93, and the shift lever 102 is connected to the exposed end 94b via the fork end 101. Are swingably connected. The fork end 101 or the shift lever 102 is swingably attached to the housing 74 via a bracket 103. The compression spring 95 is an elastic member that is inserted into the bottom of the vertical hole 81d and resiliently pushes the clutch pin 93 toward the one end 81a of the axle 81.

The forward clutch pawl 91 of the forward driven bevel gear 72 and the reverse clutch pawl 92 of the reverse driven bevel gear 73 are opposed to each other, and are arranged at a predetermined distance from each other. The end of the clutch pin 93 projecting from 81e is detachably hooked. The distance between the driven bevel gears 72 and 73 for forward / reverse movement is determined by the cylindrical distance collar 9 concentric with the axle 81.
6 is held. The distance collar 96 also functions as a stopper for the clutch pin 93 by surrounding the axle 81. As is apparent from the above description, it can be said that the forward / reverse switching mechanism 90 is disposed near the axle 81. In the figure, 104 is a connecting pin, 111 and 112 are oil seals, and 113 is a thrust washer.

FIG. 7 is an exploded perspective view of the forward / reverse switching mechanism according to the present invention.
e, the clutch pin 93 is fitted,
Is springed by the compression spring 95. There are a plurality of reverse clutch pawls 92... Are arranged concentrically and annularly in a side view, and a clutch recess 98 into which the clutch pin 93 fits is provided between the respective reverse clutch claws 92. .. Are provided. The same applies to the forward clutch claws 91.

The distance collar 96 is composed of two color division bodies 96A and 96B which are divided in the radial direction. These color division bodies 96A and 96B are overlapped to surround the axle 81 and elastically fit in the circumferential groove 96a on the outer peripheral surface. By fitting a retaining ring 97 having a

To assemble the distance collar 96,
(1) After assembling the clutch pin 93 and the compression spring 95 to the axle 81, (2) the distance collar 9 of the two-part cylinder body
6 (3) Forward / reverse clutch claws 91..., 9
(4) Positioning in the longitudinal direction between the opposed surfaces of the driven bevel gears 72 and 73 for forward / reverse movement, ) Retaining ring 9
Stop at 7. Therefore, with a simple configuration, the clutch pin 93
And the distance between the driven bevel gears 72 and 73 for forward / reverse movement can be easily maintained. As described above, the assembling work of the distance collar 96 is simple. Moreover, the clutch pin 93 fitted to the axle 81 can be selectively engaged with the forward / reverse clutch claws 91 and 92, so that the configuration of the clutch can be simplified.

Returning to FIG. 5 once, the shift lever 102 extends rearward of the vehicle via a joint 105 that allows only a swing in the vertical direction of the vehicle. Through, and grip 1 at the rear end
06. The mounting plate 26 is provided with a guide groove 26a for guiding the shift lever 102 in the left-right direction of the vehicle, and a positioning groove 26b at the center and both ends of the guide groove 26a. Such a fork end 101, a shift lever 102, a grip 106,
The assembly structure including the bracket 103 and the guide groove 26a of the mounting plate 26 forms an operation mechanism 100 for a forward / reverse switching mechanism.

Next, the operation of the forward / reverse switching mechanism 90 having the above configuration will be described with reference to FIGS. FIG. 8 is a diagram (part 1) for explaining the operation of the forward / reverse switching mechanism according to the present invention. The drive bevel gear 71 is always rotating in the clockwise direction ro. As a result, the forward driven bevel gear 72 always rotates in the counterclockwise direction (forward direction) rf, and the reverse driven bevel gear 73 is always rotated in the clockwise direction (reverse direction). Direction) rr. Now, since the shift lever 102 is in the neutral position N, the shift rod 94 is in a state where the clutch pin 93 is set to the neutral position shown in the figure. Therefore, the clutch pin 93 is not engaged with the forward / reverse clutch claws 91, 92, and is in the clutch off state. Therefore, the axle 81
Has stopped. At this time, the power single wheel carrier 10
(See FIG. 1) can be manually pushed forward or backward.

FIG. 9 is a diagram (part 2) for explaining the operation of the forward / reverse switching mechanism according to the present invention. When the shift lever 102 is switched to the forward operation position Fo and the shift rod 94 is pushed in, the shift rod 94 moves the clutch pin 93 against the elastic force of the compression spring 95. As a result, the clutch pin 93 is engaged with the forward clutch pawl 91 and the forward clutch is turned on. Accordingly, the power from the driving bevel gear 71 passes through the driven bevel gear 72 for forward movement → the clutch pawl 91 for forward movement → the clutch pin 93 → the through-hole 81e, and passes through the axle 8
It is transmitted to 1. At this time, the axle 81 rotates in the counterclockwise direction (forward direction) rf.
(See FIG. 1) can be driven forward by the driving force.

FIG. 10 is an operation explanatory view (3) of the forward / reverse switching mechanism according to the present invention. When the shift lever 102 is switched to the reverse operation position Ro and the shift rod 94 is pulled, the clutch pin 93 moves toward the one end 81a of the axle 81 by the elastic force of the compression spring 95. As a result, the clutch pin 93 is engaged with the reverse clutch pawl 92, and the reverse clutch is turned on. Therefore, the power from the drive bevel gear 71 is transmitted to the axle 81 via the driven bevel gear 73 for reverse travel → the clutch pawl 92 for reverse travel → the clutch pin 93 → the through hole 81e. At this time, the axle 81 rotates in the clockwise direction (reverse direction) rr.
0 (see FIG. 1) can be made to travel backward by the driving force.

FIG. 11 is a modified example of the operating mechanism for the forward / reverse switching mechanism according to the present invention. The operating mechanism 120 for the forward / reverse switching mechanism includes a clutch operating lever mechanism 121 operated by fingers of a hand, and a clutch operating lever. The operating force of the mechanism 121 is transmitted via the crank wire 125 to the shift rod 94.
And a crank mechanism 131 that advances and retracts.

The clutch operating lever mechanism 121 attaches a clutch operating lever 124 to the case 122 via a shaft 123, puts a thumb on the clutch operating lever 124, and turns the crank wire 125 clockwise in FIG. When the release lever 126 is pressed, an automatic return mechanism (not shown) automatically returns the clutch operation lever 124 from the position indicated by the imaginary line to the position indicated by the solid line in the figure. Clutch operating lever mechanism 12
1, for example, is attached to the left operation handle 16L in FIG. 1 as indicated by an imaginary line.

The crank mechanism 131 includes a case 132 and a crank lever 134 attached to a case 132 via a shaft 133.
Is turned to move the shift rod 94 forward and backward, and the shaft 133 is provided with an auto return mechanism. The auto return mechanism plays a role of always returning the shaft 133 to the neutral position. In the modification, the configuration and operation of the second speed reduction mechanism 70 and the forward / reverse switching mechanism 90 are the same as those shown in FIGS. 6 to 10, and are denoted by the same reference numerals, and description thereof will be omitted.

When the clutch operating lever 124 is at the forward position Fo shown by the solid line, the crank lever 134 is at the position shown by the solid line and pushes the shift rod 94. As a result, the shift rod 94 pushes the clutch pin 93 and engages with the forward clutch claw 91, and the forward clutch is turned on. At this time, since the axle 81 rotates in the counterclockwise direction (forward direction) rf, the powered single wheel carrier 10 (FIG. 1)
) Can be driven forward by the driving force.

Put a thumb on the clutch operation lever 124,
When the crank wire 125 is pulled by turning clockwise to switch to the reverse position Ro shown by the imaginary line, the crank lever 134 turns to the position shown by the imaginary line and pulls the shift rod 94. As a result, the clutch pin 93 moves toward the one end 81a of the axle 81 by the elastic force of the compression spring 95, engages the reverse clutch pawl 92, and turns on the reverse clutch. At this time, the axle 81 rotates in the clockwise direction (forward direction) rr, so that the power single wheeled vehicle 10 (see FIG. 1) can be moved backward by the driving force.

It should be noted that, in the above-described embodiments and the modifications, the drive source is not limited to the motor 13, but may be, for example, an engine. Further, the elastic member that rebounds from the clutch pin 93 is not limited to the compression spring 95.

[0043]

According to the present invention, the following effects are exhibited by the above configuration. According to a first aspect of the present invention, there is provided a single-wheel carrier equipped with one drive wheel, wherein a power transmission mechanism for transmitting power from a drive source to the drive wheels is provided with a forward / reverse switching mechanism. Is mechanically switched between forward and reverse, so that the drive wheels can be freely switched between forward rotation and reverse rotation even when only one output shaft of the drive source is rotated. be able to. Therefore, even if the drive source is an engine, the power single-wheel carrier can be switched between forward traveling and reverse traveling.

Further, even when the driving source is a motor and the forward / backward operation is frequently repeated, there is no need to switch the rotation direction of the motor, so that the starting load does not frequently act on the motor. Therefore, a relatively small motor can be used. Moreover, since the rotation direction of the motor is not switched by the control system, the control system has a simple configuration. Therefore, a low-cost motor or control system can be used, and the cost of the single-wheeled vehicle can be reduced.

Further, by arranging the forward / reverse switching mechanism near the axle, it is possible to make effective use of the empty space around the axle and to make the powered single-wheeled vehicle relatively small. Furthermore, since the vehicle is a one-wheeled vehicle, the vehicle body is tilted at the time of turning or the like, but since the forward / backward switching mechanism is disposed near the axle at a predetermined height, the forward / backward switching mechanism is grounded or turned. There is no need to worry about the radius increasing.

According to a second aspect of the present invention, the forward / reverse switching mechanism rotatably mounts a forward driven bevel gear and a reverse driven bevel gear on an axle supporting a wheel so as to face each other. A drive bevel gear driven by a drive source is meshed, a forward clutch and a reverse clutch are provided on opposing surfaces of the forward and backward driven bevel gears, and a radially protruding clutch pin is provided in the middle of the axle in the longitudinal direction. Movably mounted along
This clutch pin is resiliently repelled toward the end of the axle by an elastic member, and a bottomed vertical hole concentric with the axle is provided on the end surface of the axle,
A shift rod is fitted into this vertical hole so as to be able to move forward and backward, and the insertion end of this shift rod is brought into contact with the clutch pin, so that the shift pin moves forward and backward to move the clutch pin in the same direction, and the end of this clutch pin Is selectively applied to the forward clutch pawl or the reverse clutch pawl, so that the clutch pin radially protruding from the axle can be directly engaged with the forward clutch pawl or the reverse clutch pawl. Therefore, the number of parts constituting the clutch is small,
The configuration of the clutch can be simplified. As a result, the forward / reverse switching mechanism can have a relatively simple configuration.

[Brief description of the drawings]

FIG. 1 is a perspective view of a power single wheeled vehicle according to the present invention.

FIG. 2 is a side view of the power single-wheel carrier according to the present invention.

FIG. 3 is a plan view of a single-wheeled motor vehicle according to the present invention.

FIG. 4 is a configuration diagram and operation diagram of an operation lever mechanism and a potentiometer according to the present invention.

FIG. 5 is a sectional view of a power transmission mechanism according to the present invention.

FIG. 6 is a sectional view of a second speed reduction mechanism according to the present invention.

FIG. 7 is an exploded perspective view of a forward / reverse switching mechanism according to the present invention.

FIG. 8 is an operation explanatory view of a forward / reverse switching mechanism according to the present invention (part 1);

FIG. 9 is a view for explaining the operation of the forward / reverse switching mechanism according to the present invention (part 2).

FIG. 10 is a view for explaining the operation of the forward / reverse switching mechanism according to the present invention (part 3);

FIG. 11 is a modified example of the operation mechanism for the forward / reverse switching mechanism according to the present invention.

[Explanation of symbols]

Reference numeral 10 denotes a single wheel carrier, 12 denotes wheels as driving wheels, 1
3 ... motor as drive source, 14 ... power transmission mechanism, 50
.. First deceleration mechanism, 70 second deceleration mechanism, 71 drive bevel gear, 72 forward driven bevel gear, 73 reverse drive bevel gear, 81 axle, 81a axle end (one end), 81c end face, 81d: vertical hole, 81e: through hole,
90: forward / backward switching mechanism, 91: forward clutch pawl, 9
2. Clutch for backward movement, 93: Clutch pin, 94: Shift rod, 94a: Insertion end of the shift rod, 95: Compression spring as an elastic member, 102: Shift lever.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3D036 EB03 EB15 EB35 EC17 GH05 GJ15 3D039 AA02 AA03 AB17 AC04 AC12 AC21 AD11 3D050 AA01 BB03 DD01 EE07 EE12 GG06 JJ07 KK14

Claims (2)

[Claims] 1. A vehicle having one drive wheel in the center of the width of the vehicle,
In a single wheel carrier equipped with a drive source for driving the drive wheels through a power transmission mechanism in a vehicle, the power transmission mechanism moves the drive wheels forward and backward near an axle that supports the drive wheels. A power single-wheeled transport vehicle comprising a forward / reverse switching mechanism for mechanically switching. 2. The forward / reverse switching mechanism includes a forward driven bevel gear and a backward driven bevel gear rotatably mounted on an axle supporting the wheels so as to face each other, and the forward / reverse driven bevel gear is mounted on the forward / reverse driven bevel gear. A drive bevel gear driven by a drive source is meshed, a forward clutch and a reverse clutch are provided on opposing surfaces of the forward and backward driven bevel gears, and a radially protruding clutch pin is provided in the middle of the axle in the longitudinal direction. The clutch pin is movably mounted along the shaft, and this clutch pin is resiliently springed toward the end of the axle with an elastic member. The shift pin is moved in the same direction by moving the shift rod forward and backward by contacting the insertion end of the shift rod with the clutch pin. 2. The powered single wheeled vehicle according to claim 1, wherein an end of the latch pin is selectively engaged with a forward clutch claw or a reverse clutch claw.