JP2000142547A - Drive unit device for power-assisted bicycle, and power- assisted bicycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drive unit device for a power-assisted bicycle which can be simply and easily fitted to an existing bicycle to be driven by a human- generated torque, and a power-assisted bicycle to be remodeled by mounting the drive unit on the existing bicycle. SOLUTION: A drive unit device 10 for a power-assisted bicycle to be fitted to a rear frame of a bicycle and an axle of a rear wheel in an attachable/ detachable manner comprises a drive unit 36 provided with an electric motor 28, a reduction gear 30 having a clutch, and a drive gear 34, a control unit 40 in which a control circuit to control the drive force of the electric motor 28 according to the output of a torque sensor is built in a case, and the case is fixed to the drive unit 36, and a fitting and fixing jig unit 48 which is fixed to the drive unit 36, inserted in an axle 42, and provided with a fitting and fixing tool 46 to be fixed to a fitting hole 44 and a rear frame. The drive unit device 10 is of integrated structure, and can be easily mounted on the existing bicycle, and can be provided at low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive unit for an assisted bicycle and an assisted bicycle, and more particularly to a drive unit for an assisted bicycle which is detachably mounted on an existing bicycle driven by, for example, human torque, and the drive unit. Related to assisted bicycles equipped with existing bicycles.

[0002]

2. Description of the Related Art A conventional assisted bicycle is constructed by mounting a drive mechanism including an electric motor and a battery for supplying power to the electric motor on a dedicated body frame, so that the structure becomes complicated and the cost increases accordingly. There is a problem.

[0003]

SUMMARY OF THE INVENTION It is, therefore, a primary object of the present invention to provide a drive unit for an assisted bicycle which can be easily and easily attached to an existing bicycle driven by manual torque, and an existing drive unit for the assisted bicycle. The purpose of the present invention is to provide an assisted bicycle which is modified by being mounted on a bicycle.

[0004]

SUMMARY OF THE INVENTION The present invention removably attaches to a rear frame and an axle of a bicycle, and includes a drive unit including an electric motor, a speed reducer and a drive gear, and a drive unit. An assist bicycle drive unit device including a fixing jig unit, and an assist bicycle in which the drive unit device is mounted on an existing bicycle.

[0005]

The mounting and fixing jig unit can be integrated with a drive unit having an electric motor, a speed reducer and a drive gear. In addition, the mounting work on the existing bicycle can be easily performed.

[0006]

According to the present invention, the handling of the drive unit device is simplified, and the existing bicycle can be easily converted into an assist bicycle by the owner. In addition, the cost of remodeling will be much lower than when purchasing an existing assisted bicycle. The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows a drive unit device 10 for an assisted bicycle according to an embodiment of the present invention.
The assist bicycle is configured to be detachably mounted on the vehicle 2 and travels by appropriately adding the auxiliary power of the drive unit device 10 to the human power of the occupant. The bicycle 12 includes a handlebar 16 and a front wheel 18 on a front frame 14a of a body frame 14,
The saddle 20 and the pedals 22, 2 are provided on the center frame 14b.
2 and a rear wheel 26 that is rotationally driven by the crank rotation mechanism 24 via a chain (not shown) is provided on the rear frame 14c.

The drive unit device 10 includes a drive unit 36 having a DC electric motor 28, a speed reducer 30 with a clutch for reducing the rotational force of the motor 28, and a drive gear 34 fixed to an output shaft 32 of the speed reducer. , A torque sensor (not shown) disposed on the crank rotation mechanism 24
A control unit (not shown) mainly including a microcomputer for controlling the power of the electric motor 28 in accordance with the output of the control unit 40 is built in the case 38 and the case 38 is fixed to the drive unit 36; Mounting hole 44 fixed to the vehicle and inserted into the axle 42 of the rear wheel 26 of the bicycle 12
And a mounting fixture unit 48 having a mounting fixture 46 attached to the rear frame 14c.

In this embodiment, the drive unit 36, the control unit 40 and the mounting fixture unit 48 are integrated as a module. However, the control unit 40 is separated and It may be attached to. Furthermore, these three units can be separated and assembled modularly when attached to the existing bicycle 12.

As shown in FIGS. 1 and 2, the drive unit device 10 has the mounting hole 44 of the mounting fixture unit 48 inserted into the axle 42 and is fixed together with the rear wheel 26 by a fastener 50 such as a nut. The bicycle 12 is mounted on the right side of the rear wheel 26 by sandwiching the rear frame 14c with the mounting fixture 46. The axle 42 of the rear wheel 26 is provided with a gear 52 driven by the crank rotation mechanism 24 via a chain, a driven gear 54 fixed to the gear 52 in a turtle shape, and a transmission 56. A chain (not shown) is stretched between the drive gear 34 of the drive unit 36 and the driven gear 54 connected to the axle 42 via the transmission 56, and the rotational driving force of the electric motor 28 is adjusted and transmitted to the rear wheel 26. You. When the rear wheel 26 of the bicycle 12 rotates in the backward direction, the output shaft 32 of the electric motor 28 does not rotate due to the clutch speed reducer 30.

That is, the rotational driving torque of the electric motor 28 is transmitted to the rear wheel 2 of the bicycle 12 through the speed reducer 30 with a clutch.
6 and further transmitted to the transmission 56 by being added to the stepping torque generated by the occupant, and transmitted to the transmission 56 at each speed ratio.
And the rotation speed of the rear wheel 26 of the bicycle 12 correspond to the rotation speed of the rear wheel 26, and there are a plurality of characteristic curves. Therefore, the electric motor 28 can be used efficiently.

Power is supplied to the drive unit device 10 by a battery device 58 which is detachably mounted on the vehicle body frame 14 of the bicycle 12. This battery device 58
The battery case 60 includes a battery case (not shown) and an openable and closable battery case 60 containing an electric component attached to the battery. The battery case 60 has a concave engaging portion 62 at a front portion and a handle portion 64 at a rear portion. Feeder 6 on the rear bottom
6 is provided. The battery case 60 also includes a battery remaining amount display unit.

On the other hand, a first battery fixing member 68 is removably attached to the body frame 14 of the bicycle 12 by a screw or the like on a central frame 14b located below the saddle 20. The second battery fixture 70 is detachably attached to the frame 14b using screws or the like. The second battery fixture 70 includes a battery receiver 74 having a power receiving terminal 72 coupled to the power supply unit 66 of the battery device 58, and a key on the side of the receiver 74 for controlling ON / OFF of the battery. And a key lock 76 including a lock mechanism for securely fixing the battery device 58.

Therefore, by mounting the assisted bicycle drive unit device 10 and the battery device 58 for supplying power to the drive unit device 10 on the existing bicycle 12, the bicycle can be easily converted into an assisted bicycle.

[Brief description of the drawings]

FIG. 1 is an illustrative view of a schematic configuration of an assist bicycle showing one embodiment of the present invention;

FIG. 2 is a perspective view of a main part of the assist bicycle drive unit device according to the present invention in FIG. 1 in an attached state.

FIG. 3 is a perspective view of the assist bicycle drive unit device shown in FIG. 2;

FIG. 4 is a perspective view of a main part in a state where a battery device is removed in FIG. 1;

FIG. 5 is a perspective view of the battery device in FIG. 1;

6 is a bottom view of the battery device shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Drive unit apparatus for assist bicycles 12 ... Bicycle 14 ... Body frame 28 ... Electric motor 30 ... Reduction gear with clutch 34 ... Drive gear 36 ... Drive unit 40 ... Control unit 42 ... Axle (rear wheel axle) 48 ... Mounting and fixing Jig unit 58 ... Battery device 68 ... First battery fixture 72 ... Second battery fixture

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Seiji Murakami 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Kazuya Shimizu 2-chome Keihanhondori, Moriguchi-shi, Osaka No. 5-5 in Sanyo Electric Co., Ltd.

Claims (7)

[Claims] 1. A drive unit having an electric motor, a speed reducer and a drive gear, which is detachably mounted on a rear frame and an axle of a bicycle, and wherein the drive unit includes a mounting fixture unit. Drive unit device for assist bicycle. 2. The assisted bicycle according to claim 1, further comprising a control unit having a built-in control circuit for controlling the electric motor in accordance with the output of the torque sensor in a case and fixing the case to the drive unit. Drive unit device. 3. An assisted bicycle comprising the bicycle mounted with the drive unit for an assisted bicycle according to claim 2. 4. The assisted bicycle according to claim 3, wherein the bicycle includes a transmission on rear wheels. 5. The assist bicycle according to claim 3, further comprising a battery device for supplying power to the drive unit device. 6. A first battery fixing device fixed to a saddle mounting frame of the bicycle and a second battery fixed to a frame near a handle mounting and having a power receiving terminal on a mounting portion and a key lock on a side portion. The assist bicycle according to claim 5, further comprising a fixing device, wherein the battery device is detachably mounted by the both fixing devices. 7. The battery device according to claim 6, further comprising: a locking portion for locking the first battery fixing device at a front portion, a handle portion at a rear portion, and a power feeding portion at the bottom portion for connecting to the power receiving terminal. Assisted bicycle.