JP2002053091A - Bicycle transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor-driven transmission device for a bicycle having a motor-driven transmission gear switching mechanism, which eliminates a drawback that a battery cannot be shifted during running due to battery exhaustion. SOLUTION: An output of a generator provided as a lighting power source is connected to a motor via a rectifier, and is also used as a driving power source.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission gear switching device for a bicycle.

[0002]

2. Description of the Related Art The conventional method and principle shown in FIGS. 3 and 4 will be described. Two large and small chain rings 22 and 23 fixed to the crankshaft 2 directly connected to the foot pedal
There is a method of shifting by shifting the position of a chain guide 25 for rewinding the chain 24, and converting the motor power into a linear motion to shift the chain guide 25 and moving between two predetermined positions. Let me. The speed is high when the chain is wound around the large chain ring 22, and the speed is low when the chain is replaced around the small chain ring 23. Chain rings are not two-stage, but four
It is arranged in the order of the number of teeth at approximately
5 can be moved between the four positions, and the chain can be wound around four chain guides having different numbers of teeth.

[0003] A chain guide 25 is a spur gear (not shown) that is a component of the reduction mechanism 10 in the power unit 12.
The rack gear 20 meshes with the extending portion of the rack gear 20.
The sensor 11 is attached to the spur gear of the reduction mechanism 19, and functions to detect the rotation angle, transmit a signal to the controller 9, and stop the motor 8 from the operation. The sensor 11 is set so that the shift position of the chain guide is determined by cooperation between the cyst switch and the controller.

[0004] As a power source of the motor 8, four batteries 32 housed in a battery holder 31 are mounted on the body frame 1 of the bicycle. The battery 32 has to be checked and replaced, which is inconvenient.

[0005]

As described above, there has been a disadvantage that the capacity of the battery is depleted and the shift cannot be suddenly performed during traveling. It has been a problem to eliminate this drawback and to realize a device that drives the motor by another means to change the speed.

[0006]

SUMMARY OF THE INVENTION The present invention focuses on using a lighting generator mounted on a front wheel or a rear wheel as a power supply source for a motor. Chain rewinding comprising a motor driven and stopped by a controller and a sensor in response to operation of a shift switch mounted on a steering handle, a speed reduction mechanism connected to the motor, and a chain guide transmitted from the speed reduction mechanism. As a power source for the means, a generator for lighting is also used. For the installed generator, an AC generator is used because of its maintenance and cost advantages. On the other hand, a motor suitable for precise control such as control is a DC motor, and DC is suitable as a power source for a controller and a sensor of the motor. By branching and connecting the output of the machine, one generator could be used for two purposes.

The power supply to the motor is controlled in response to the operation of a shift switch connected to a controller having a rectifier interposed on the input side and in response to a signal from a sensor. By shifting the position of the guide, the gear change is achieved.

[0008]

FIG. 1 is a system diagram showing the structure of a bicycle transmission according to the present invention, FIG. 2a is a front view showing a main part of the above-mentioned device, and FIG. 2b is a side view thereof. In these figures, reference numeral 1 denotes a vehicle body frame, in which an upper portion has a saddle, and a lower end is provided with a hanger portion 3 for holding a crankshaft 2, and a crank with a foot pedal is fixed to the crankshaft 2. A speed change power unit 12 is attached to a lower position in the middle of the body frame 1. Lighting equipment 4
Is connected to a generator 6 via a switch 5.

The generator 6 is mounted on a front wheel or rear wheel hub. Electric power supplied from the generator 6 to the motor 8 in accordance with the operation of the shift switch 7 attached to the steering handle is controlled and supplied by the controller 9. Motor 8
Is connected to a speed reducing mechanism 10 composed of a plurality of gears, and a sensor 11 is mounted so as to mesh with a driven gear at the final stage, which is an element of the speed reducing mechanism. The signal is transmitted to the motor 8
Operate to stop.

[0010] Motor 8, controller 9, reduction mechanism 10
And the speed change power unit 12 is constituted by the sensor 11,
Mounted on the vehicle body frame 1, the output of the speed change power unit 12 shifts the position of the chain guide 25 and shifts the chain 24 to achieve the speed change. The speed change power unit 12 is obtained by removing a battery from the conventional power unit.

The generator 6 generates AC power, and the switch 5
Power is supplied to the lighting fixture 4 through the power supply. However, in order to use the power as the power source of the above-mentioned power transmission unit, the rectifier 13 converts AC into DC and supplies power to the controller 9, the motor 8, and the sensor 11. Need to be supplied as For this purpose, a rectifier 13 is connected to the input side of the controller to rectify the output of the hub generator 6, and a capacitor for smoothing a DC voltage and a voltage for suppressing voltage fluctuation to be small. It is also effective to interpose a control element on the input side of the controller.

[0012]

According to the present invention, a battery is not required as in the prior art. Since the power supply function of the lighting and the power supply function of the motor for driving the transmission can be obtained from one AC generator, the conventional disadvantage that the gear cannot be changed suddenly during traveling is eliminated. Since the batteries, which are consumables, have been removed, the need for inspection and replacement is eliminated, which helps to rationalize costs and contributes to environmental protection and resource saving, and has great industrial value.

[Brief description of the drawings]

FIG. 1 is a system diagram of a transmission showing an embodiment according to the present invention.

FIGS. 2A and 2B are a front view and a side view of a main part showing an embodiment according to the present invention.

FIG. 3 is a system diagram of a conventional transmission.

FIG. 4 is a front view and a side view of a main part of a conventional transmission.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body frame 2 Crankshaft 3 Hanger 4 Lighting equipment 5 Switch 6 Generator 7 Shift switch 8 Motor 9 Controller 10 Reduction mechanism 11 Sensor 12 Transmission power unit 13 Rectifier 20 Rack gear 22 Chain ring (large) 23 Chain ring (small) 24 Chain 25 Chain guide 32 Battery

Claims (1)

[Claims] 1. A bicycle transmission having a speed reduction mechanism connected to a motor driven in response to a shift switch operation, a chain guide transmitted from the speed reduction mechanism, a sensor for controlling the motor, and a controller. A bicycle transmission, wherein a rectifier is interposed on an input side, and a generator for a lighting power source is also used as a power supply source of the motor.