JP2545913Y2 - Power transmission device for electric vehicles - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmission device for a light electric vehicle such as a solar car.

[0002]

2. Description of the Related Art In the case of an electric vehicle which needs to drive wheels by a small motor with a relatively small electric power, such as a solar car, a large and heavy power transmission such as used in a vehicle with an internal combustion engine is used. No mechanism can be used.

[0003]

Therefore, in this type of electric vehicle, a freewheel (a wheel having a sprocket and being rotatable only in one direction) is mounted on an axle in the same manner as a bicycle power transmission mechanism, and a motor is provided. A power transmission device in which a sprocket of a freewheel and a sprocket of the freewheel are connected by a chain or the like is used.

[0004] However, an apparatus having a structure in which a freewheel mounted on an axle is driven by a chain or the like enables inertial running and does not cause any problem in forward running. Because of the freewheel, the sprocket spins idling and there is a problem that it cannot reverse.

The present invention has been made in order to solve the above-mentioned problem, and enables forward / reverse and forward inertia-free traveling, and can be manufactured to be small and lightweight by a very simple mechanism. An object is to provide a power transmission device for an electric vehicle suitable for a solar car or the like.

[0006]

For this purpose, the power transmission device for an electric vehicle according to the present invention is provided with an inner wheel cylinder fixed to wheels.
And an outer ring with a sprocket on the outer periphery.
Externally fit the ring onto the inner ring cylinder via a one-way clutch
A freewheel that can drive the axle
Through a chain to the sprocket on the outer ring of the freewheel
Drive motor and freewheel inner ring
The outer ring is slidably fitted axially on the extended end of the cylindrical body.
The driving force when the part is rotated in the reverse direction is
Cylindrical one-way clutch that transmits power to the outer ring
The clutch drive unit of the reverse clutch provided in the
Fixed on the one-way clutch facing the clutch drive
Driven part of the reverse clutch and the operating fork
The clutch driven part is slid in the axial direction via
Reverse operation link mechanism connected so as to perform
It is comprised including.

[0007]

When the electric vehicle travels forward, the outer ring portion of the freewheel is rotationally driven by the motor in the forward direction.
The axle is driven in the same direction and travels forward.

[0008] When the motor is stopped on a downhill or the like, the inner wheel cylinder of the freewheel runs idle and performs inertial running.

When the vehicle travels backward, the reverse operation link mechanism is operated to slide the clutch driven portion of the reverse clutch in the axial direction, connect the clutch driven portion to the clutch drive portion, and reversely rotate the motor. The reverse rotation force of the motor is transmitted to the outer ring portion of the freewheel, and rotates it in the reverse direction.

The rotational force of the outer ring portion in the reverse direction is transmitted to the one-way clutch via the clutch driving portion and the clutch driven portion of the reverse clutch, and the one-way clutch transfers the rotational driving force in the reverse direction through the inner ring cylinder. To the axle, and the axle is rotationally driven in the reverse direction.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is 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 denotes an axle of an automobile, and a freewheel 2 is mounted on the axle 1.

The freewheel 2 comprises an inner race tube body 3 fixed to the axle 1 and an outer race portion 4 having a sprocket 5 provided on the outer periphery. The outer race portion 4 includes two one-way clutches 6.
And one roller bearing 7, is fitted on 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 driven by the motor in the forward direction, for example, as shown in FIG.
, And the axle 1 is driven in the same direction.

The one-way clutch 6 used here
As shown in FIG. 4, a cam surface is formed in a shell-shaped outer ring 6a, and a number of rollers 6b are disposed inside the outer ring 6a by being biased by a spring 6c so as to abut the cam surface. Structure. This one-way clutch 6 has no inner ring.
b directly abuts on the shaft (in this case, the inner wheel cylinder 3 of the freewheel 2).

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

At the left end of the outer race 4 of the freewheel 2, a clutch drive 11 for the reverse clutch 10 is provided. The reverse clutch 10 is formed in a dog clutch type, and the clutch drive unit 11 is configured by providing a clutch gear on the front surface of a flange-type ring unit on a circumference.

On the other hand, the left side of the inner wheel cylinder 3 of the freewheel 2
On the direction extension end , via a one-way clutch 8,
The clutch driven portion 12 of the reverse clutch 10 is fitted externally slidably in the axial direction. The clutch driven portion 12 is provided with a similar clutch gear meshing with the clutch gear of the clutch driving portion 11 at the right end of the cylinder, and the outer ring of the one-way clutch 8 is fixed to the inner peripheral surface of the cylinder. .

The one-way clutch 8 is similar to the one-way clutch 8 shown in FIG.
The one-way clutch 6 of the freewheel 2 is configured in the same manner as the one-way clutch 6 of the freewheel 2.
It is installed so that it becomes the opposite direction.

That is, when the one-way clutch 6 of the freewheel 2 drives the outer ring portion 4 to rotate in the direction A in FIG. 1, the rotational force is transmitted to the inner wheel cylinder 3, that is, the axle 1. The one-way clutch 8 is mounted opposite to the one-way clutch 6 so that when the clutch driven part 12 is driven in the direction B (reverse direction) in FIG. 1, the rotational force is transmitted to the inner wheel cylinder 3, that is, the axle 1. You.

A groove is formed in the outer peripheral portion of the clutch driven portion 12 in the circumferential direction, and the tip of the operating fork 13 is engaged with the groove while allowing the clutch driven portion 12 to rotate. The operating fork 13 is slidably held at its base on a shaft 14 parallel to the axle 1 and is movable in the axial direction of the axle 1. Axis 1
4 is supported on both sides by a fixing portion 15 and its axis 1
A coil spring 16 is externally fitted to 4 and biases the operating fork 13 in the left side of FIG.

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

Next, the operation of the power transmission device having the above configuration will be described.

When the electric vehicle travels forward, the outer ring 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 wheel cylinder 3 of the freewheel 2 runs idle due to the action of the one-way clutch 6, and the vehicle performs inertia-free running.

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. Due to the movement of the operation fork 13, the clutch driven portion 12 of the reverse clutch 10 slides to the right in FIG. 1 together with the one-way clutch 8, and the clutch driven portion 12 meshes with the clutch drive portion 11 to connect the clutch.

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

In the above embodiment, the reverse clutch 1
Although a dog clutch type clutch was used for 0, various clutches such as a synchronizer type clutch can be used.

[0028]

As described above, according to the power transmission device for an electric vehicle of the present invention, the inner wheel cylinder fixed to the wheel is provided.
And an outer ring with a sprocket on the outer periphery.
Externally fit the ring onto the inner ring cylinder via a one-way clutch
A freewheel that can drive the axle
Through a chain to the sprocket on the outer ring of the freewheel
Drive motor and freewheel inner ring
The outer ring is slidably fitted axially on the extended end of the cylindrical body.
The driving force when the part is rotated in the reverse direction is
Cylindrical one-way clutch that transmits power to the outer ring
The clutch drive unit of the reverse clutch provided in the
Fixed on the one-way clutch facing the clutch drive
Driven part of the reverse clutch and the operating fork
The clutch driven part is slid in the axial direction via
Reverse operation link mechanism connected so as to perform
Because was configured with, with during forward are possible inertia practice, by connecting the reverse clutch by operating the backward operating linkage, it is possible to perform reverse running.

Further, since the power transmission device can be manufactured in a small and light weight because only a reverse clutch and a small one-way clutch with a simple structure are provided in a part of the freewheel, the driving power of a solar car or the like can be reduced. Ideal for small lightweight electric vehicles.

[Brief description of the 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 line II-II of FIG.

FIG. 3 is a sectional view taken along the line III-III of FIG. 1;

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

[Explanation of symbols]

1-axle, 2-freewheel, 3-inner cylinder, 4-outer ring, 5-sprocket, 6, 8-one-way clutch, 10-reverse clutch, 11-clutch drive, 12
-Clutch driven part, 13-Working fork, 17-Link wire, 18-Operating pedal.

Claims (1)

(57) [Scope of request for utility model registration] An inner ring cylinder fixed to a wheel;
And an outer ring portion provided on the outer peripheral portion.
The outer cylinder is externally fitted via a one-way clutch.
A chain is attached to a freewheel that can drive the axle in the forward direction , and a sprocket on the outer ring of the freewheel.
A driving motor that is linked through the shaft and an axially sliding portion on the extension end of the inner race cylinder of the freewheel.
The outer ring portion is rotatively driven in the reverse direction.
Cylindrical one-way for transmitting the driving force when
Clutch and a reverse drive clutch provided at an end of the outer ring portion.
A moving part, and the clutch driving part on the cylindrical one-way clutch.
Clutch driven portion of the reverse clutch fixed oppositely
And slide the driven portion of the clutch in the axial direction via the operating fork.
Reverse operation connected to engage and disengage the clutch
A power transmission device for an electric vehicle , comprising: a link mechanism .