JPH1159556A - Drive device of electrically driven bicycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric bicycle in which an electric driving device is miniaturized and reduced in weight, and the electric driving is easily mounted on a frame of a regular bicycle now in use. SOLUTION: A motor 5, a reduction mechanism 32, a unidirectional clutch 33, a torque clutch 34 and a transmission mechanism to a hub outer cylinder 35 are built in a hub inner cylinder 4 in which a screw shaft 30 is fixed to a bottom plate 29 by providing a flange 31, a flange 7 is provided in its clearance part to open a screw hole 8, a brake cover 1 to which the screw shaft 2 is fixed by providing the flange 7 is projected outside from a front side after an input terminal 9 of a motor 5 is covered with an insulation material 10, and fitted by a screw 11. Screw shafts 2, 30 are fixed to the frame 23 of a bicycle by nuts 24, and an extended side end part of the brake cover 1 is fixed to a chain stay by a nut using a band piece.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auxiliary wheel driving device for an electric bicycle.

[0002]

2. Description of the Related Art An input drive system and an electric drive system are provided in parallel, and an electric wheel drive device is operated in accordance with the torque of the stepping force for traveling by the pedaling force of an occupant, thereby reducing the stepping force. Currently on the market.

[0003] However, when these bicycles get off the bicycle and walk, the assist does not work and the weight of the vehicle is 5 times that of a normal bicycle.
Because it is too heavy, there is a drawback that people who are weaker than those who go over hills and steps are burdensome.

[0004] A one-way clutch is provided between the master shaft and the slave shaft of the electric drive device. When the master shaft is stopped, the one-way clutch idles and the slave shaft rotated by the stepping force is electrically driven. Although the load is not connected without connecting to the motor or deceleration mechanism of the device, when the bicycle is retracted, the one-way clutch connects and rotates the motor, so a load occurs and the load becomes heavy when retreating There were drawbacks.

[0005]

SUMMARY OF THE INVENTION The object of the present invention is to make an electric driving device smaller and lighter, and to easily attach it to a frame of an ordinary bicycle currently used and convert it to an electric bicycle. I have.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems and the like, the present invention provides a hub for driving wheels having a double structure of a hub inner cylinder and a hub outer cylinder, and a motor, a speed reduction mechanism,
Install the one-way clutch, the transmission mechanism to the hub outer cylinder, etc., cover it with a brake cover, insulate the input terminal of the motor from the front of the brake cover, and wire it out.

[0007] A disk for mounting a brake drum and spokes is provided on the outer periphery of the hub outer cylinder, a sprocket having a one-way clutch mounted on a bottom plate is mounted on the hub outer cylinder, and the sprocket is rotatably mounted on the hub inner cylinder. Are connected by a transmission mechanism using

[0008] A screw shaft provided on the hub inner cylinder and the brake cover is fixed to the bicycle frame with a nut, and the side end of the brake cover is fixed to a chain stay using a metal band or the like.

In the present invention, it is convenient to use a one-way clutch which is connected to the shaft only when the motor shaft rotates, for the one-way clutch incorporated in the hub inner cylinder. Further, a torque clutch is incorporated between the motor shaft of the hub inner cylinder and the hub outer cylinder.

[0010]

The driving device of the present invention configured as described above has the following features.
In terms of shape, there is no great difference from the conventional internal transmission type hub of ordinary vehicles, and the mounting method can be easily mounted on the conventional frame just by tightening the nut.

The brake cover of the present invention, besides the brake function, fixes the motor in the hub inner cylinder, dissipates heat generated by the motor, and receives torque generated when the wheels are driven.

In addition, by using a one-way clutch in which the shafts are connected only when the motor shaft rotates as the one-way clutch of the driving device, the motor shaft is lightly retracted without being rotated when the bicycle is retracted. Can be.

Further, since the torque clutch is incorporated in the drive device, the motor shaft is not locked even if the drive device operates while the wheels are stopped.

[0014]

Embodiments will be described with reference to the drawings.
FIGS. 1 and 2 show a state in which an auxiliary wheel drive device according to the present invention is mounted on a frame 23 of a bicycle, and a motor is provided in a hub inner cylinder 4 in which a screw shaft 30 is fixed to a bottom plate 29 by providing a flange 31. 5, speed reduction mechanism 32, one-way clutch 33,
A torque clutch 34 and a transmission mechanism 35 to a hub outer cylinder 36 are assembled, a flange 7 is provided in the frontage thereof, a screw hole 8 is opened, and a brake cover 1 in which the screw shaft 2 is provided with the flange 3 is fixed. Then, the input terminal 9 of the motor 5 is covered with an insulator 10, is put out from the front, and is attached with a screw 11.

Since large forces such as vibrations and loads are applied to the screw shafts 2 and 30, it is preferable to firmly fix the flanges 3 and 31 to the installation portions by welding or the like.

A sprocket 38 having a one-way clutch 37 mounted on a bottom plate 39 is fixed to the hub outer cylinder 36, a disk 40 for attaching spokes is provided on the outer periphery, and the brake drum 6 is formed in the opening, and the ball bearings 14, 41 are formed. To be rotatably mounted on the hub inner cylinder 4.

The brake cover 1 has a band brake 13 with a lining 12 fixed to a fixed shaft 15 at one end and a fixed shaft 18 of a lever 17 rotatably mounted to the shaft 16 of the brake cover 1 at another end. When the brake wire 19 is fixed to the lower portion of the lever 17 with a nut 20 and the compression coil spring 21 is operated so as to press, the band brake 13 tightens the brake drum 6,
At the same time, the lever 17 presses the microswitch 22 to cut off the power to the motor 5.

When a rim brake is used for a driven wheel, the above-mentioned brake mechanism can be omitted.

Further, in the embodiment, the present drive device is used for the rear wheel, but can be used for the front wheel, and can be used for a wheelchair or the like.

The bicycle frame 23 has screw shafts 2, 3
0 is fixed with a nut 24, and the extended side end 25 of the brake cover 1 is fixed to a chain stay 26 with a nut 28 using a band fitting 27, which is exactly the same as the conventional method of mounting the rear wheel. In addition, the chain stay 26 receives the torque when the brake is applied during running and the torque when the drive device is operated from the side end portion 25.

FIG. 3 shows the speed reducing mechanism 32 of the embodiment.
The sun gear 43 attached to the motor shaft 42 has a turntable 4
The planetary gear 46 fitted on the pin 45 fixed to the pin 4 meshes with the internal gear 47 provided on the hub inner cylinder 4 to reduce the rotation of the rotating disk 44. Depending on the rotation speed of the motor shaft 42, it is better to reduce the speed by one step.

FIG. 4 shows a part of the one-way clutch 33 of the embodiment. A rotating disk 48 similar to the rotating disk 44 which rotates together with the planetary gear 46 is provided with a spacer 49, has a groove 50 in the middle, and is fixed with screws or the like. And the claw 51 at the open end in the groove 50.
A plurality of centrifugal clicks 52 provided with a
Then, the centrifugal click 52 is connected to the rotation link 54 by a link 55.
Is connected with pins 56 and 57, and another centrifugal link 52 is connected.
a is installed in the same manner.

A ball bearing 59 is provided in a cylindrical shaft 58 of the rotary disk 48 to support a rotary shaft 60, and a rotary link 54 is rotatably mounted outside the cylindrical shaft 58.

A clutch disk 62 provided with internal teeth 61 on the outer circumference of the rotary disks 44 and 48 is rotatably mounted on a rotary shaft 60,
The rotating discs 44 and 48 rotate and the centrifugal force causes the centrifugal click 52.
Is rotated, and the pawl 51 is engaged with the internal teeth 61. This movement synchronizes another centrifugal click 52a via the link 55 and the rotating link 54, and the pawls 51 and 51a are simultaneously engaged with the internal teeth and the clutch is engaged. The board 62 is rotated.

When the motor 5 stops and the rotating disks 44 and 48 stop and only the clutch disk 62 rotates from the connected state as described above, the claws 51 and 51a are pushed inward by the internal teeth 61 and 61a. , The nails 51 and 51a are the internal teeth 6
Centrifugal clicks 52, 52 at positions not in contact with
a stops and the state shown in FIG. 4 is reached. In this state, the rotating disks 44, 4
8 is not connected.

FIG. 5 shows an embodiment of a portion of the torque clutch 34. A disk 66 in which internal teeth 63 are arranged on the back surface of a clutch disk 62 and a plurality of elastic pieces 65 having claws 64 are provided inside the disk 66.
Are fixed to the rotating shaft 60 by providing a pinion 67 on the back surface, and the pawl 64 is pressed against the valley 68 of the internal teeth 63 by elasticity, and the two are connected and rotated. When a torque is applied, the pawl 64 is pushed inward, comes off the valley 68 of the internal teeth 63, slides out, and the connection between the two is released.

FIG. 6 shows an embodiment of a transmission mechanism 35 for transmitting the power of the motor 5 of the hub inner cylinder 4 to the hub outer cylinder 36. A plurality of pins 69 are fixed to the bottom plate 29 of the hub inner cylinder 4.
The gear 70 is fitted into the pin 69 by meshing with the pinion 67, a part of the gear is brought out of the cutout portion 71 opened in the hub inner cylinder 4, and meshes with the internal gear 72 provided on the hub outer cylinder 36. The end of 69 is fixed to the shaft stopper 73 to stabilize the gear 70. Thus, when the pinion 67 of the disk 66 rotates, the gear 70 rotates, and the internal gear 72 and the hub outer cylinder 36 can be rotated.

FIGS. 7 and 8 show the centrifugal click 52 of the one-way clutch 33 used in the embodiment tuned by another method. FIG. 7 shows the pawls 51b and 51c at the open ends and the other ends. The centrifugal clicks 52b and 52c provided with the arm 74 are pivotally supported 53b and 53c on the turntable 48b, and the link 55b is connected to the open end and the end of the arm 74 by the pins 56b and 57.
b, and internal teeth 61 provided on a clutch disc 62 on the outer periphery thereof.
b and 61c are installed so that the two centrifugal clicks 52b and 52c move synchronously.

FIG. 8 shows a centrifugal click 5 using a gear 75.
2d, 52e are tuned, and centrifugal click 5
A sector gear 76 is formed on 2d and 52e toward the axis, and meshes with a gear 75 attached to the cylindrical shaft 58a.
The clutch disks 62 provided with the internal teeth 61d and 61e are provided symmetrically with the shaft supports 53c and 53e on the rotating disk 48c. The rotating disk 60a freely rotates in the cylindrical shaft 58a.
Fixed to.

The one-way clutch using the centrifugal click shown in FIGS. 7 and 8 has the same function as the one-way clutch shown in FIG.

FIG. 9 shows an embodiment in which the torque clutch 34 is provided on the outer side of the hub inner cylinder 4.
The ring gear 7 is rotatably mounted in the hub outer cylinder 36.
7 is provided with a crown 78 on the side surface thereof so that the bottom plate 3 of the hub outer cylinder 36 is provided.
The compression coil spring 80 attached to the outer periphery of the hub inner cylinder 4 presses the mountain teeth 79 formed at 9a.

Thus, when an unacceptable torque is applied between the ring gear 77 and the hub outer cylinder 36, the compression coil spring 80 is pressed to move the ring gear 77, and the crown 7
8 slides over the mountain tooth 79 and the connection between the two is released.

[0033]

Since the present invention is configured as described above, it has the following effects.

By simply screwing the screw shaft and the side end of the brake cover to the frame, the drive device can be mounted on a conventional bicycle, and a variety of electric bicycles can be obtained at low cost.

By incorporating the drive mechanism in the hub inner cylinder, it is possible to reduce the weight and size of the drive device and suppress an increase in the weight of the vehicle body.

By using a brake cover as a lid of the hub inner cylinder, heat generated by the motor is dissipated, driving torque is easily received, and attachment to the frame is simplified.

By using a one-way clutch whose rotation is transmitted to the slave shaft only when the motor operates in the one-way clutch of the driving device, the bicycle can be retreated lightly without rotating the motor when the bicycle is retracted, and the bicycle is taken out of the bicycle parking area. It is not inconvenient at times.

Since the torque clutch is provided between the motor shaft of the hub inner cylinder and the hub outer cylinder, when the wheels stop and the hub outer cylinder stops, even if the motor is energized, this portion idles. The motor shaft does not lock, preventing overheating. This is because, as a characteristic of the DC motor, as the number of rotations decreases, the electric resistance of the winding decreases and the current flows excessively, and if the current continues to flow while the rotation is stopped, the winding burns out.

Further, when the driving device is operated at the time of starting the bicycle, the torque clutch slips to prevent a sudden start, thereby enabling smooth running.

The one-way clutch which moves a plurality of centrifugal clicks in synchronism as shown in FIGS. 4, 7, and 8 does not operate under the influence of acceleration such as gravity or vibration, and needs to press the claws inward by a spring. Because there is no, the pawl spreads at very low speed rotation (about 60 rotations per minute) and connects to the slave shaft, and multiple claws synchronize with the internal teeth, so there is no worry about one-sided, and there is no slippage and reliable Can transmit the rotation.

[Brief description of the drawings]

FIG. 1 is a front view of an embodiment according to the present invention.

FIG. 2 is a side sectional view of FIG.

FIG. 3 is a front sectional view of a speed reduction mechanism of the embodiment.

FIG. 4 is a front sectional view of a one-way clutch portion of the embodiment.

FIG. 5 is a front sectional view of a torque clutch portion of the embodiment.

FIG. 6 is a front sectional view of a transmission mechanism portion of the embodiment.

FIG. 7 is a front sectional view of the embodiment of the one-way clutch.

FIG. 8 is a front sectional view of the embodiment of the one-way clutch.

FIG. 9 is a front sectional view of the embodiment of the torque clutch.

[Description of sign]

DESCRIPTION OF SYMBOLS 1 Brake cover 2, 30 Screw shaft 3, 7, 31 Flange 4 Hub inner cylinder 5 Motor 6 Brake drum 9 Input terminal 13 Band brake 14, 59, 41 Ball bearing 17 Lever 23 Frame 27 Band fitting 29, 39 Bottom plate 32 Reduction mechanism 33 One-way clutch 34 Torque clutch 35 Transmission mechanism 36 Hub outer cylinder 44, 48 Rotating disc 47, 72, 72a Internal gear 52, 52a, 52b, 52c, 52d, 52e Centrifugal click 60 Rotating shaft 62 Clutch disc 70, 75 Gear 77 ring gear

Claims (5)

[Claims] 1. A hub inner cylinder is made hollow, and a screw shaft is fixed to a bottom plate of the hub inner cylinder and a brake cover serving as a lid of an opening.
A hub outer cylinder is installed rotatably around the screw shaft outside the hub inner cylinder, and a drive mechanism consisting of a motor is incorporated in the hub inner cylinder, and the drive rotation is transmitted to the hub outer cylinder to drive the wheels. Drive device for an electric bicycle. 2. A motor, a speed reduction mechanism, a one-way clutch, and a transmission mechanism from the hub inner cylinder to the hub outer cylinder are incorporated in the hub inner cylinder, and the opening thereof is covered with a brake cover. 2. The electric bicycle driving device according to claim 1, wherein a sprocket provided with a one-way clutch is provided on a bottom plate of the hub outer cylinder after being insulated and outside. 3. The electric bicycle driving device according to claim 2, wherein a one-way clutch that transmits the rotation to the hub outer cylinder only when the motor shaft rotates is mounted on the one-way clutch in the hub inner cylinder. 4. The electric bicycle drive device according to claim 2, wherein a torque clutch is incorporated between the motor shaft and the hub outer cylinder. 5. A plurality of centrifugal clicks each having a claw provided at an interval between two rotary disks serving as original shafts are rotatably supported at equal intervals, and the centrifugal clicks are linked or geared. A one-way clutch which is mounted so as to operate in synchronism by using an internal gear provided on a clutch disc which is driven by the outer periphery of the clutch disc.