JPH0567525U - Power transmission device for electric vehicle - Google Patents

Abstract

(57) [Summary] [Purpose] Power transmission for electric vehicles suitable for solar cars, etc., capable of forward / backward movement and inertia-free running, and with a very simple mechanism, can be made compact and lightweight. Provide the device. A freewheel 2 capable of driving an axle 1 in a forward direction is attached to the axle 1, and a driving motor is linked to a sprocket 5 of an outer ring portion 4 of the freewheel 2 via a chain. A cylindrical one-way clutch 8 that transmits the driving force when the outer ring portion 4 is rotationally driven in the reverse direction to the inner ring tubular body 3 is axially slid on the end portion of the inner ring tubular body 3 of the free wheel 2. It is movably fitted. A clutch drive unit 11 of the reverse clutch 10 is provided at an end of the outer ring portion 4, and a clutch driven unit 12 of the reverse clutch is fixed on the one-way clutch 8 so as to face the clutch drive unit 11.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a power transmission device for a lightweight electric vehicle such as a solar car.

[0002]

[Prior Art]

 For electric vehicles that require relatively small power and small motors to drive the wheels, such as a solar car, use a large and heavy power transmission mechanism such as that used in internal combustion engine vehicles. You cannot do it.

[0003]

[Problems to be solved by the device]

 Therefore, in this type of electric vehicle, a free wheel (a wheel that has a sprocket and can be driven to rotate only in one direction) is attached to the axle, similar to the power transmission mechanism of a bicycle, and the space between the motor and the free wheel is set. A power transmission device connected by a chain is used.

However, with a device having a structure in which a freewheel attached to an axle is driven by a chain or the like, inertial traveling is possible and there is no problem in forward traveling, but it is attempted to reverse the motor by rotating the motor in reverse. However, since it is a freewheel, there was a problem that the sprocket spins in the air and cannot reverse.

The present invention has been made to solve the above-mentioned problems, and it is possible to perform forward / backward and forward inertia-free traveling, and it is possible to manufacture a compact and lightweight structure with a very simple mechanism. The purpose of the present invention is to provide a power transmission device for an electric vehicle that is suitable for a solar car and the like.

[0006]

[Means for Solving the Problems]

 Therefore, in the power transmission device for an electric vehicle of the present invention, a freewheel capable of driving the axle in the forward direction is attached to the axle, and a driving motor is attached to a sprocket on the outer ring portion of the freewheel via a chain. A cylindrical one-way clutch that is linked and that transmits the driving force when the outer ring part is rotationally driven in the reverse direction to the inner ring cylinder is slidable in the axial direction on the end part of the inner ring cylinder of the freewheel. The clutch drive part of the reverse clutch is provided at the end of the outer ring part, and the clutch driven part of the reverse clutch is fixed on the one-way clutch so as to face the clutch drive part. A reverse operation link mechanism is connected to the portion via an actuating fork so as to slide the clutch driven portion in the axial direction to connect and disconnect the clutch.

[0007]

[Action]

 When an electric vehicle travels forward, the outer wheel portion of the freewheel is rotationally driven in the forward direction by the motor, and the axle is driven in the same direction to travel forward.

When the motor is stopped on a downhill or the like, the inner wheel cylinder of the freewheel runs idle and runs inertially.

When traveling in reverse, the reverse operation link mechanism is operated, the clutch driven part of the reverse clutch is slid in the axial direction, the clutch driven part is connected to the clutch drive part, and the motor is reversely rotated. The reverse rotation force of the motor is transmitted to the outer ring portion of the freewheel, causing it to rotate in the reverse direction.

The rotational force in the reverse direction of the outer ring portion is transmitted to the one-way clutch via the clutch drive section and the clutch driven section of the reverse clutch, and the one-way clutch transfers the rotational drive force in the reverse direction to the inner ring tubular body. Is transmitted to the axle via the, and the axle is rotationally driven in the reverse direction.

[0011]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a front view with a half section of a power transmission device in a lightweight electric vehicle such as a solar car. Reference numeral 1 is an axle of a vehicle, on which a freewheel 2 is mounted.

The freewheel 2 is composed of an inner ring tubular body 3 fixed to the axle 1 and an outer ring part 4 having a sprocket 5 provided on the outer periphery thereof. The outer ring part 4 includes two one-way clutches 6 and one The roller bearing 7 is fitted onto the inner ring cylinder 3 so as to be rotatable only in one direction. A motor is linked to the sprocket 5 via a chain (not shown), and the freewheel 2 is rotationally driven, for example, in the direction of arrow A (forward direction) in FIG. Driven in the direction.

As shown in FIG. 4, the one-way clutch 6 used here has a cam surface formed inside a shell-shaped outer ring 6 a, and a large number of rollers 6 b are abutted on the cam surface inside. The structure is such that it is biased by the spring 6c. This one-way clutch 6 has no inner ring, and the roller 6b directly contacts the shaft (here, the inner ring cylinder 3 of the free wheel 2).

The one-way clutch 6 is formed to be very small and lightweight, and when the outer ring 6a is rotationally driven in the direction of arrow D in FIG. 4, the roller 6b is pressed against the shaft and the shaft is rotationally driven in the same direction. Conversely, when the outer ring 6a is rotationally driven in the direction of arrow C, the pressing of the roller 6b against the shaft is released, and the one-way clutch 6 idles on the shaft.

A clutch drive unit 11 of the reverse clutch 10 is provided at the left end of the outer wheel portion 4 of the freewheel 2. The reverse clutch 10 is formed in a dog clutch type, and the clutch driving unit 11 is configured by circumferentially providing a clutch gear on the front surface of a flange type ring unit.

On the other hand, the clutch driven portion 12 of the reverse clutch 10 is axially slidably fitted onto the left end portion of the inner ring cylinder 3 of the free wheel 2 via the one-way clutch 8. The clutch driven portion 12 is configured by providing a similar clutch gear that meshes with the clutch gear of the clutch drive portion 11 at the right end portion of the tubular body, and the outer ring of the one-way clutch 8 is fixed to the inner peripheral surface of the tubular body. To be done.

The one-way clutch 8 is constructed in the same manner as the one-way clutch 6 of FIG. 4 described above, and the one-way clutch 6 is mounted so that its rotational driving direction is opposite to that of the one-way clutch 6 of the free wheel 2.

That is, when the one-way clutch 6 of the freewheel 2 rotationally drives the outer ring portion 4 in the direction A of FIG. 1, the rotational force is transmitted to the inner ring tubular body 3, that is, the axle 1, but the clutch driven portion. When the clutch driven part 12 is driven in the B direction (reverse direction) of FIG. 1, the one-way clutch 8 of 12 transmits the rotational force to the inner ring tubular body 3, that is, the axle 1, so that the one-way clutch 6 is opposite to the one-way clutch 6. It is installed in the direction.

A groove is circumferentially formed in the outer peripheral portion of the clutch driven portion 12, and the tip of the operating fork 13 is engaged with the groove while allowing the clutch driven portion 12 to rotate. The actuating fork 13 has a base portion slidably held by a shaft 14 parallel to the axle 1, and is movable in the axial direction of the axle 1. The shaft 14 is supported on both sides by fixing portions 15, and a coil spring 16 is fitted onto the shaft 14 to urge the operating fork 13 to the left side in FIG.

Further, the operation fork 13 is connected to a link wire 17 which serves as a reverse operation link mechanism, and an end portion of the link wire 17 is connected to an operation pedal 18. Therefore, when the operation pedal 18 is depressed, the actuating fork 13 moves to the right side in FIG. 1 via the link wire 17, and the clutch driven portion 12 of the reverse clutch 10 slides in the meshing direction together with the one-way clutch 8. The one-way clutch 8 is slidable in the axial direction when the inner rollers are not pressed against the inner ring tubular body 3.

Next, the operation of the power transmission device configured as described above will be described.

When the electric vehicle travels forward, the outer wheel portion 4 of the freewheel 2 is rotationally driven in the forward direction by a motor (not shown), the axle 1 is driven in the same direction via the one-way clutch 6, and the vehicle travels forward. ..

When the drive of the motor is stopped on a downhill or the like, the inner ring cylinder 3 of the freewheel 2 idles due to the action of the one-way clutch 6 and the vehicle runs inertia free.

On the other hand, when traveling backward, the driver depresses the operation pedal 18 and moves the operating fork 13 to the right side in FIG. 1 via the link wire 17. By this movement of the operating fork 13, the clutch driven portion 12 of the reverse clutch 10 slides to the right side in FIG. 1 together with the one-way clutch 8, and the clutch driven portion 12 meshes with the clutch driving portion 11 to connect the clutch.

Then, when the motor is started in the reverse rotation direction, the outer ring portion 4 of the freewheel 2 is rotationally driven in the reverse direction (arrow B direction in FIG. 1), and the driving force of the reverse clutch 10 is connected. The one-way clutch 8 is transmitted to the one-way clutch 8 via the clutch drive unit 11 and the clutch driven unit 12, and the one-way clutch 8 transmits the rotational driving force in the reverse direction to the axle 1 via the inner ring cylinder 3 and the axle 1 to the reverse direction. Driven to rotate. As a result, while the operation pedal 18 is depressed and the motor rotates in the reverse direction, the electric vehicle runs backward.

Although the dog clutch type is used as the reverse clutch 10 in the above embodiment, various clutches such as a synchronizer type clutch can be used.

[0028]

[Effect of the device]

 As described above, according to the power transmission device for an electric vehicle of the present invention, the free wheel capable of driving the axle in the forward direction is attached to the axle, and the driving motor is connected to the sprocket on the outer ring portion of the free wheel. A cylindrical one-way clutch that transmits the driving force to the inner ring cylinder when the outer ring part is rotationally driven in the reverse direction is axially mounted on the end of the inner ring cylinder of the freewheel. The clutch drive part of the reverse clutch is provided at the end of the outer ring part, and the clutch driven part of the reverse clutch is fixed on the one-way clutch so as to face the clutch drive part. , The reverse operation link mechanism is connected to the clutch driven part via the operating fork so as to slide the clutch driven part in the axial direction to connect and disconnect the clutch. With proceeds during a possible inertia practice, by connecting the reverse clutch by operating the backward operating linkage, it is possible to perform reverse running.

Further, since it can be configured by only providing a reverse clutch and a small one-way clutch with a simple structure in a part of the free wheel, the power transmission device can be manufactured in a small and lightweight structure, and the driving power of a solar car or the like can be reduced. Ideal for small and light electric vehicles.

[Brief description of drawings]

FIG. 1 is a front view with a half section of a power transmission device showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a partial cross-sectional explanatory view of a one-way clutch.

[Explanation of symbols]

1-Axle, 2-Freewheel, 3-Inner ring cylinder, 4-Outer ring part, 5-Sprocket, 6, 8-One way clutch, 10-Reverse clutch, 11-Clutch drive part, 12
-Clutch driven part, 13-operating fork, 17-link wire, 18-operation pedal.

Claims (1)

[Scope of utility model registration request] 1. A freewheel capable of driving an axle in a forward direction is attached to an axle, a driving motor is linked to a sprocket of an outer ring portion of the freewheel via a chain, and an inner ring tubular body of the freewheel is attached. A tubular one-way clutch that transmits the driving force when the outer ring portion is rotationally driven in the reverse direction to the inner ring tubular body is axially slidably fitted over the end portion, and the one-way clutch is slidable in the axial direction. A clutch drive unit of a reverse clutch is provided at an end of the clutch, and a clutch driven unit of the reverse clutch is fixed on the one-way clutch so as to face the clutch drive unit, and the clutch driven unit is reversely moved to the clutch driven unit via an operating fork. A power transmission device for an electric vehicle, wherein an operation link mechanism is connected so as to slide the clutch driven part in an axial direction to connect and disconnect the clutch.