JPH08282574A - Bicycle with electromotor - Google Patents

Abstract

PURPOSE: To provide a composing method for a driving mechanism of a small size and a light weight, in a bicycle with electromotor. CONSTITUTION: On the outer periphery of a crankshaft 301 to compose a manual force driving system, an electromotor 100 to compose an electromotor driving system; and a planetary reduction mechanism 200 to reduce the speed of the output of the electromotor 100; are provided concurrently. Consequently, since the driving mechanism case is made in a small size and a light weight, the appearance of the bicycle with electromotor is made in a style having little difference with a normal bicycle, and furthermore, the low cost of the driving mechanism is realized, and the operation workability is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bicycle with an electric motor in which a human power drive system and an electric motor drive system are provided in parallel.

[0002]

2. Description of the Related Art A bicycle equipped with an electric motor in which a human power drive system and an electric motor drive system are provided in parallel is already known. However, many proposals have been made for a method of disposing an electric motor of an electric motor drive system and a speed reducer for reducing the output rotation speed of the electric motor.

For example, JP-A-4-358986, 2
From page 1 column 48 line 2 column 6 line, in order to realize the reduction of the number of parts and the miniaturization of the molding die when manufacturing the cover,
It has been proposed that an electric motor, a speed reducer, a battery, and a controller are arranged along a frame member extending from a bottom bracket that holds a crankshaft to which a pedal is attached.

Japanese Patent Application No. 54-134550, No. 1
From page 2, column 10, line to page 2, column 3, line 3, the crankshaft and the output drive shaft of the electric motor are arranged in the same gear case in order to reduce the overall shape of the drive unit, and the rotation speed of the crankshaft is set. It has been proposed to connect both shafts by a connecting mechanism so as to increase the speed of transmission of the drive gear to the output drive shaft and to reduce the outer diameter of the drive gear connected to the output drive shaft.

Further, in JP-A-54-72408, from page 1, column 2, line 16 to page 2, column 3, line 1 line, an electric motor and a planetary gear unit are provided to reduce the overall size of the drive mechanism. It describes the example incorporated into the body.

[0006]

However, in the first and second conventional examples, the crankshaft driven by the crank pedal forming the human power drive system, the shaft of the electric motor forming the electric motor drive system, and the rotation of the electric motor. Since the shaft of the speed reducer for reducing the speed is arranged as a separate shaft,
In the second conventional example, the electric motor and the speed reducer are formed as protrusions from the crankshaft case, and the appearance of the electric motor-equipped bicycle is significantly different from that of a general bicycle. Further, the second conventional example has a problem that the case of the drive mechanism becomes large.

The third conventional example is an example in which a drive device is constructed in the rear tire hub, and the frame of a general bicycle cannot be used because the electric motor and the speed reducer become long in the axial direction of the hub. Therefore, when manufacturing a bicycle with an electric motor, it is necessary to use a dedicated frame, which causes a problem of high cost.

[0008] In addition, all of the already proposed ones show an example in which the motor is equipped with a brush. However, in general, a motor with a brush is provided with a commutator, a brush, a brush holder, etc. in the axial direction for commutation. Since it is arranged, there is a problem that the electric motor becomes long in the axial direction. Further, the brushed electric motor has a problem that its life is short due to abrasion of the brush and a problem that bearings such as bearings are damaged due to generation of abrasion powder.

An object of the present invention is to firstly construct a small and lightweight drive mechanism section, secondly to provide an electric bicycle which can be manufactured at low cost, and thirdly to provide a drive mechanism section having a long life. Is to configure.

[0010]

In order to achieve the above object, the present invention relates to a bicycle with an electric motor in which a human power drive system and an electric motor drive system are provided in parallel, on the outer periphery of a crankshaft constituting the human power drive system. An electric motor that constitutes an electric motor drive system,
A planetary speed reducer for reducing the output of the electric motor is provided together.

Further, according to the present invention, in a bicycle with an electric motor in which a human power drive system and an electric motor drive system are provided in parallel, the electric motor which constitutes the electric motor drive system is arranged on the outer periphery of the crankshaft which constitutes the human power drive system. Is characterized by.

Further, according to the present invention, in a bicycle with an electric motor in which a human power drive system and an electric motor drive system are provided in parallel, the output of the electric motor which constitutes the electric motor drive system is reduced around the outer periphery of the crankshaft which constitutes the human power drive system. It is characterized in that a planetary speed reducer is provided.

Further, according to the present invention, in a bicycle with an electric motor in which a human power drive system and an electric motor drive system are provided in parallel, the electric motor constituting the electric motor drive system has a built-in reduction mechanism for reducing the output of the electric motor. And

The present invention is also characterized in that a planetary speed reducer is used for the speed reduction mechanism.

Further, the present invention is characterized in that the electric motor constituting the electric motor drive system is arranged in the rear tire hub.

The present invention is also characterized in that the electric motor constituting the electric motor drive system is arranged in the front tire hub.

Further, the present invention is characterized in that the electric motor constituting the electric motor drive system is arranged on the outer periphery of the crankshaft constituting the human power drive system.

Further, the present invention is characterized in that a brushless motor is used for the electric motor.

[0019]

According to the bicycle with an electric motor of the present invention described above, in a bicycle with an electric motor in which a human-powered drive system and an electric-motor drive system are provided in parallel, an electric-motor drive system is provided on the outer periphery of a crankshaft constituting the human-powered drive system. Since the constituent electric motor and the planetary speed reducer for reducing the output of the electric motor are arranged together, it is necessary to provide a bearing portion that supports the shaft of the electric motor and the shaft of the planetary speed reducer in the drive mechanism case that covers the drive mechanism. Since there is no drive mechanism, the drive mechanism can be made smaller and lighter.

As described above, since the driving mechanism is downsized and is smaller than the outer diameter of the front sprocket or has a similar size, the driving mechanism is hidden by the front sprocket. Therefore, when compared with a general bicycle, there is no great difference in appearance, and an electric bicycle can be constructed. Further, since the drive mechanism does not protrude from the bicycle with the electric motor as a protrusion, it is possible to prevent damage or destruction of the drive mechanism portion when the vehicle falls over. Further, when manufacturing the drive mechanism case, the drive mechanism case is generally manufactured by using a casting die, but the mold cost can be reduced by downsizing the drive mechanism case. In addition, since the drive mechanism section is lightened, fluctuations when the bicycle starts and when it goes uphill are reduced. Further, since the inertial energy on the downhill is small, the braking performance is improved and the safety is improved.

A bearing portion for supporting the shaft of the electric motor is provided by disposing an electric motor forming the electric motor drive system or a planetary reduction mechanism for reducing the output of the electric motor around the outer periphery of the crank shaft forming the human power drive system. Alternatively, since it is not necessary to provide a bearing portion that supports the shaft of the planetary gear reducer in the drive mechanism case, the drive mechanism can be made smaller and lighter. Therefore, the same effect as described above can be obtained.

Further, in the present invention, since the belt drive mechanism can be used when transmitting the output of the electric motor to the adjacent speed reducing mechanism, noise and vibration can be reduced. Further, the reduction ratio can be obtained by making the diameter ratio of the pulleys of the belt drive mechanism different.

Further, in the electric motor constituting the electric motor drive system,
By incorporating a speed reduction mechanism that reduces the output of the electric motor, the drive mechanism can be made short in the axial direction. By using a planetary speed reducer for the speed reduction mechanism, the drive mechanism can be made more compact. In addition, since the drive mechanism is short in the tire axial direction by disposing the electric motor in the rear tire hub, the JIS
It is possible to configure an electric bicycle with a frame defined by the standard (Japanese Industrial Standard). According to the JIS standard, the width of the frame (chain stay) for fixing the rear tire hub is specified to be 120 mm, 124 mm, or 127 mm. The same applies to the case where the electric motor is provided in the front hub. Since the drive mechanism is short in the tire axial direction, the electric bicycle can be configured with a frame defined by JIS standard. According to JIS, the width of the frame that secures the front tire hub is 9
It is specified as 3 mm. Therefore, it is possible to provide a low-cost motorized bicycle because it is not necessary to make a new frame when manufacturing the motorized bicycle. Further, it becomes possible to construct a bicycle with an electric motor by attaching a drive mechanism to a general bicycle.

Further, by disposing the drive mechanism on the outer periphery of the crankshaft, the drive mechanism is shortened in the crankshaft direction, so that the electric bicycle is constructed with the hanger width defined in JIS standard. It is possible. According to the JIS standard, the width of the hanger part that fixes the crankshaft is 68
It is defined as mm, 70 mm, and 73 mm. Therefore, if the width is around this value, the driver of the bicycle with the electric motor does not feel a big discomfort in the existence of the drive mechanism.

Further, by incorporating a reduction mechanism for reducing the output of the electric motor in the electric motor constituting the electric motor drive system, the drive mechanism case includes a bearing portion for supporting the electric motor shaft and the planetary speed reducer shaft. Since it is not necessary to provide the cover on the drive mechanism case, the drive mechanism can be made smaller and lighter.
Therefore, the same effect as described above can be obtained.

By using a brushless motor as the electric motor constituting the electric motor drive system, the drive mechanism can be made shorter in the crankshaft, front tire hub shaft, and rear tire hub shaft directions. Compared with brush motors, brushless motors are commutators,
This is because a commutation function such as a brush and a brush holder is not required. Therefore, the action shown above can be made more effective.

Further, since no brush is provided, the life of the electric motor is long, and since no abrasion powder of the brush is generated, the bearing and the like are not damaged. Therefore, the reliability of the drive mechanism can be improved.

[0028]

【Example】

(Embodiment 1) FIG. 1 is a sectional view of a drive mechanism showing an embodiment of the present invention, FIG. 2 is a view showing a schematic configuration of a human power drive system and an electric motor drive system, and FIG. 3 is an overall configuration of a bicycle with an electric motor. It is a figure. In the present embodiment, a detailed description will be given of an example in which an electric motor that constitutes an electric motor drive system and a planetary speed reducer that reduces the output of the electric motor are both arranged on the outer periphery of a crankshaft that constitutes a human power drive system. .

In FIG. 1, a crank 302 and a crank pedal (not shown) are attached to a crank shaft 301, and a bearing 3 is provided at the center of a drive mechanism case 306.
It is rotatably supported via 03. Crankshaft 3
01 and the sprocket 304 are attached via a one-way clutch 305, and a human tread force is chained (not shown).
To the rear tire via.

On the outer periphery of the crankshaft 301, there are arranged the electric motor 100 constituting the electric motor output drive system, the planetary speed reducer 200 for reducing the output of the electric motor, the sprocket 304 for transmitting the output to the rear tire, and the like. The entire drive mechanism case 306 is covered.

The electric motor 100 includes a stator 101 and a rotor 1.
02, a field magnet 103, an electric motor winding 104, and a rotor position detecting means 105 (for example, a hall element), which is a brushless motor. An electric motor winding 104 is applied to the stator 101, and an appropriate phase is excited in the electric motor winding by a signal from the rotor position detecting means 105, so that the rotor 1
02 rotates. The rotor 102 is rotatably arranged around the crankshaft 301 via a bearing 309. The stator 101 is fixed to a drive mechanism case 306 attached to a frame (not shown) of a bicycle with an electric motor.

The first stage planetary speed reducer 201 and the second stage planetary speed reducer 202 are composed of a sun gear, a planetary gear and an internal gear. The sun gear 203 of the first stage planetary reducer 201 is connected to the rotor 102 via the crank arm 206.
And is disposed rotatably around the crankshaft 301. The sun gear 207 of the second stage planetary reduction mechanism 202 is connected to the crankshaft 3 via a bearing 310.
It is rotatably arranged around 01. Internal gears 205 and 209 of the first stage planetary speed reducer 201 and the second stage planetary speed reducer 202 are fixed to a drive mechanism case 306. The planet gear 204 and the sun gear 207 are connected via a crank arm 210. Planet gear 2
08 and the sprocket 304 are connected via a one-way clutch 311.

Next, the transmission of force of the electric motor drive system will be described. The output from the rotor 102 of the electric motor 100 is output via the crank arm 206 to the first stage planetary reduction mechanism 201.
Input to the sun gear 203 and output from the planetary gear 204. The output of the planetary gear 204 is the crank arm 210.
Thus, it is transmitted to the sun gear 207 of the second stage planetary reduction mechanism 202 and output from the planetary gear 208. Reduction mechanism 2
The output decelerated by 00 is transmitted to the sprocket 304 via the one-way clutch 311. The one-way clutch 311 is provided to prevent the reduction gear mechanism and the electric motor from rotating and becoming a load on the driver of the bicycle with the electric motor when the electric motor drive system is in the non-operating state.

Next, the schematic structure of the drive system will be described. As shown in FIG. 2, the human power drive system is transmitted to the front sprocket through the crankshaft. However, the one-way clutch is interposed so that the reverse rotation of the pedal does not transmit the reverse force to the drive wheels. Next, the electric motor drive system will be described. The signal of the torque detector that detects the pedaling force of a person and the speed signal of the driving wheels are transmitted to the controller. The controller calculates the required power of the motor based on the signal and determines the voltage of the electric motor. As a result, the electric motor obtains a required driving amount, and the driving force is transmitted to the speed reducer via the one-way clutch and further transmitted to the front sprocket.

A control method by the controller will be described. In the low speed range of the motorized bicycle, the output of the electric motor is made to be almost the same as the output due to human pedaling,
Controls the motor voltage. In the high speed region, the motor voltage is controlled so that the ratio of the output of the electric motor to the combined output of the human power drive system and the motor drive system decreases in proportion to the increase in speed. Therefore, it is desirable to set the output of the electric motor to 0 for safety in a certain speed range or higher.

Next, the overall structure of the electric motor-operated bicycle will be described. As shown in FIG. 3, the electric motorized bicycle includes a frame 401, a front tire 503, a handle 505, a rear tire 502, a saddle 501, and other general bicycle components, as well as a battery 401, a controller 403, and a drive mechanism 402. It The drive mechanism 402 is fixed to the frame 506 by screwing or welding. The power source of the drive mechanism 402 is the top tube 509, the down tube 508, the seat tube 5
It is supplied by a battery 401 arranged between the battery and the battery. The controller is also the top tube 50
9, the down tube 508, and the seat tube 507.

With the above structure, the electric motor constituting the electric motor drive system and the planetary speed reduction mechanism for decelerating the output of the electric motor can be arranged together on the outer circumference of the crankshaft constituting the human power drive system.

In this embodiment, a planetary speed reducer is used as the speed reducer, but it goes without saying that it can also be realized in other types of planetary speed reducers such as a fixed operation transmission and a linked planetary transmission.

(Embodiment 2) FIG. 4 is a sectional view of a drive mechanism showing an embodiment of the present invention. In the present embodiment, a detailed description will be given of an example in which the electric motor constituting the electric motor drive system is arranged on the outer periphery of the crankshaft constituting the human power drive system.

In FIG. 4, a crank 302 and a crank pedal (not shown) are attached to a crank shaft 301, and are pivotally supported by a drive mechanism case 306 via a bearing 303. Crankshaft 301 and sprocket 3
04 is attached via a one-way clutch 305, and transmits the pedal force of a person to a rear tire via a chain (not shown).

On the outer periphery of the crankshaft 301, the electric motor 100 which constitutes the electric motor output drive system, the sprocket 304 for transmitting the output to the rear tire, and the like are arranged. Further, a planetary speed reducer 200 is arranged adjacent to the electric motor 100. A pulley 307 provided on the rotor 102 of the electric motor 100 and a pulley 312 provided on the planetary speed reducer 200 are connected by a drive belt 308. A pulley 313 provided on the planetary speed reducer 200 and a pulley 314 are connected by a drive belt 315.
The pulley 314 is attached to the sprocket 304 and the one-way clutch 3
It is attached via 11. Further, they are entirely covered by the drive mechanism case 306.

The structure of the electric motor 100 is the same as that described in the previous embodiment. However, the pulley 307 is arranged on the rotor 102.

Next, the transmission of the force of the electric motor drive system will be described. The output from the electric motor 100 is the pulley 307.
It is transmitted to the drive belt 308, the pulley 312, and the planetary speed reduction mechanism 200 via. The output reduced by the planetary reduction mechanism 200 is transmitted to the front sprocket 304 via the pulley 313, the drive belt 315, the pulley 314, and the one-way clutch 311. Here, the one-way clutch 311 is provided when the electric motor drive system is not in operation.
The speed reducer and the electric motor are provided to prevent rotation and load on the driver. Also, pulleys 307 and 312, 3
By changing the outer diameter ratio of 13 and 314, the electric motor 10
Since the output from 0 can be decelerated, the planetary speed reducer 200 of the present embodiment can obtain a sufficient speed reduction ratio with the single stage planetary gear mechanism.

With the above structure, the electric motor constituting the electric motor drive system can be arranged on the outer periphery of the crankshaft constituting the human power drive system.

In the description of this embodiment, a planetary speed reducer and a speed reduction mechanism using a pulley and a belt are used as the speed reduction mechanism, but these do not limit the present invention, and other speed reduction mechanisms such as spur gears and helical gears are used. It is obvious that a combination of gears, bevel gears, worm gears, etc., a planetary differential reduction mechanism, a special planetary reduction mechanism such as a hypocycloid, etc. can be used.

(Embodiment 3) FIG. 5 is a sectional view of a drive mechanism showing an embodiment of the present invention. In the present embodiment, a detailed description will be given of an example in which a planetary speed reducer that reduces the output of the electric motor that constitutes the electric motor drive system is arranged around the outer periphery of the crankshaft that constitutes the human power drive system.

In FIG. 5, a crank 302 and a crank pedal (not shown) are attached to a crank shaft 301, and a bearing 30 is provided at the center of a drive mechanism case 306.
It is pivotally supported via 3. The crankshaft 301 and the sprocket 304 are attached via a one-way clutch 305, and transmit the pedal force of a human to a rear tire via a chain (not shown).

The electric motor 100 is provided on the outer circumference of the crankshaft 301.
A planetary speed reducer 200 that reduces the output of the vehicle, a sprocket 304 that transmits the output to the rear tire, and the like are provided. An electric motor 100 is arranged adjacent to the planetary speed reducer 200. A pulley 320 provided on the rotor 102 of the electric motor 100 and a pulley 3 provided on the planetary speed reducer 200.
21 is connected by a drive belt 322. The pulley 321 is integrated with the sun gear 203 of the planetary speed reducer 201, and is rotatably supported around the crankshaft 301. Further, they are entirely covered by the drive mechanism case 306.

The structure of the electric motor 100 is the same as that described in the previous embodiment. However, the electric motor 100 is arranged adjacent to the crankshaft 301, and the pulley 320 is arranged on the rotor 102.

The structure of the planetary speed reducer 200 is the same as that described in the previous embodiment. However, the pulley 321 is attached to the sun gear 203 of the first stage planetary speed reducer 201.
Is provided.

Next, the transmission of the force of the electric motor drive system will be described. The output from the rotor 102 of the electric motor 100 is transmitted to the planetary reduction mechanism 200 via the pulley 320, the drive belt 322, and the pulley 321. Planetary reduction mechanism 2
The output decelerated at 00 is transmitted to the sprocket 304 via the one-way clutch 311. One-way clutch 3
11 is provided in order to prevent the reduction gear and the electric motor from rotating and becoming a load on the driver when the electric motor drive system is in a non-operating state.

Further, since the output from the electric motor 100 can be decelerated by changing the outer diameter ratio of the pulleys 320 and 321, the planetary deceleration mechanism 20 of the present embodiment.
It is also possible to configure 0 with a single-stage planetary speed reducer.

With the above structure, the planetary speed reducer for reducing the output of the electric motor constituting the electric motor drive system can be arranged on the outer periphery of the crankshaft constituting the human power drive system.

In this embodiment, the planetary speed reducer is used as the speed reducer. However, it goes without saying that the planetary speed reducer of other systems such as the fixed operation transmission and the interlocking planetary transmission can be realized.

(Embodiment 4) FIG. 6 is a sectional view of a drive mechanism showing an embodiment of the present invention. In the present embodiment, a detailed description will be given of an example in which a reduction gear that reduces the output of the electric motor is built in the electric motor that constitutes the electric motor drive system. Further, an example in which a planetary speed reducer is used as the speed reducer will be described in detail. Further, an example in which the electric motor that constitutes the electric motor drive system is arranged in the rear tire hub will be described in detail.

In FIG. 6, the rear hub 510 is rotatably supported by the frame 506 via a bearing 318. A plurality of spokes 513 are stretched on the rear hub,
Supports the rear tire. A rear sprocket 512 is provided adjacent to the rear hub 510, and transmits a human driving force to the rear hub 506 by using a chain (not shown) as a medium. In addition, the rear sprocket 512 and the rear hub 51
A one-way clutch 316 is provided between 0 and 0.

Inside the rear hub 510, there are an electric motor 100 constituting an electric motor output drive system, a first-step planetary speed reducer 201 and a second-step planetary speed reducer 202 for reducing the output of the electric motor 100, a one-way clutch 317 and the like. It is arranged.

The structure of the electric motor 100 is the same as that described in the previous embodiment. However, the rotor 102 is rotatably supported by the motor case 106 by a bearing 319. Further, the rotor 102 has a cup shape, and the first-stage planetary reduction mechanism 201 is built in the internal space. The motor case 106 is fixed to the frame 506.

The first stage planetary speed reducer 201 and the second stage planetary speed reducer 202 are the planetary speed reducers described in the previous embodiment. The first stage planetary speed reducer 201 includes a motor case 106.
Fixed to the inside of the rotor 102 of the electric motor 100. The second stage planetary reducer 202 is also a motor case 1
It is fixed at 06. Rotor 102 and first stage planetary reducer 2
01, and the first stage planetary speed reducer 201 and the second stage planetary speed reducer 202 are connected by spline coupling. In addition, the second stage planetary speed reducer 202 and the rear hub 510
Are connected via a one-way clutch 317.

Next, the transmission of force of the electric motor drive system will be described. The output from the rotor 102 of the electric motor 100 is transmitted from the rotor shaft to the first stage planetary speed reducer 201 and the second stage planetary speed reducer 202 built in the cup-shaped rotor 102. The output of the second stage reduction mechanism 202 is the one-way clutch 3
It is transmitted to the rear hub 510 via 17. The one-way clutch 317 is provided to prevent the reduction gear and the electric motor from rotating and becoming a load on the driver when the electric motor drive system is in a non-operating state.

With the above construction, the speed reducer for reducing the output of the motor is built in the electric motor constituting the electric motor drive system, the planetary speed reducer is used as the speed reducer, and the electric motor constituting the electric motor drive system is the rear tire. It can be located in the hub.

Further, in the present embodiment, the example in which the electric motor constituting the electric motor drive system is arranged inside the rear hub is shown, but it goes without saying that the same structure can be formed inside the front hub and the outer circumference of the crankshaft.

In the present embodiment, the planetary speed reducer is used as the speed reducer, but it goes without saying that it can be realized in other types of planetary speed reducers such as a fixed operation transmission and a linked planetary transmission.

In the above description of the embodiments, the inner rotor type electric motor is used as the electric motor for driving the electric motor drive system, but the same applies to the outer rotor type electric motor and the axial gap type electric motor. Obviously, it can be configured.

[0065]

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

Since the electric motor and the planetary speed reducer are arranged together on the outer circumference of the crankshaft, it is not necessary to provide a bearing portion for supporting the shaft of the electric motor and the shaft of the planetary speed reducer in the drive mechanism case covering the drive mechanism. The drive mechanism is reduced in size and weight.

By reducing the size and weight of the drive mechanism, it is possible to construct a bicycle with an electric motor that is substantially the same in appearance as a general bicycle. Further, it is possible to prevent the drive mechanism portion from being damaged or destroyed when it falls over. Further, since the casting die of the drive mechanism case becomes small, the cost can be reduced. In addition, steering stability can be realized.

Further, in the electric motor which constitutes the electric motor drive system,
By incorporating the speed reducer, it is possible to shorten the drive mechanism in the axial direction. Further, by disposing the electric motor in the rear tire hub, it is possible to construct a bicycle with an electric motor with a frame defined in JIS standard. Therefore, when manufacturing a bicycle with an electric motor, it is not necessary to make a new frame, so that a bicycle with an electric motor can be provided at low cost.

Further, since the brushless motor is used as the electric motor, the life of the electric motor is long, and the abrasion powder of the brush is not generated, so that the bearing or the like is not damaged. Therefore, the reliability of the drive mechanism can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view of a drive mechanism.

FIG. 2 is a diagram showing a schematic configuration of a human power drive system and an electric motor drive system.

FIG. 3 is a diagram showing an overall configuration of a bicycle with an electric motor.

FIG. 4 is a sectional view of a drive mechanism.

FIG. 5 is a sectional view of a drive mechanism.

FIG. 6 is a sectional view of a drive mechanism.

[Explanation of symbols]

100 Motor 101 Stator 102 Rotor 103 Field Magnet 104 Motor Winding 105 Rotor Position Detecting Means 106 Motor Case 200 Planetary Speed Reduction Mechanism 201 First Stage Planetary Speed Reduction Mechanism 202 Second Stage Planetary Speed Reduction Mechanism 203, 207 Sun Gear 204, 208 planetary gear 205,209 internal gear 206,210,211 crank arm 301 crankshaft 302 crank 303,309,310,318,319 bearing 304 sprocket 305,311,316,317 one-way clutch 306 drive mechanism case 307,312,312 313, 314, 320, 321 Pulleys 308, 315, 322 Drive belt 400 Electric bicycle 401 Battery 402 Drive mechanism 403 Controller 501 Saddle 502 Rear tire 03 front tire 504 pedal 505 handle 506 frame 507 seat tube 508 down tube 509 top tube 510 rear hub 511 front hub 512 rear sprocket 513 Spoke

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yutaka Takada 3-3-5 Yamato, Suwa-shi, Nagano Seiko Epson Corporation (72) Inventor Katsumi Shinkai 3-3-5 Yamato, Suwa-shi, Nagano Seiko Epson Within the corporation

Claims (9)

[Claims] 1. A bicycle with an electric motor in which a human-powered drive system and an electric-motor drive system are provided in parallel with each other. A motor constituting the electric-motor drive system is provided around a crankshaft constituting the human-powered drive system, and the output of the electric motor is reduced. A bicycle with an electric motor, which is provided with a planetary speed reducer. 2. A bicycle with an electric motor in which a human-powered drive system and an electric-motor drive system are provided in parallel, wherein an electric motor which constitutes the electric-motor drive system is arranged around a crankshaft which constitutes the human-power drive system. A motorized bicycle. 3. A bicycle with an electric motor in which a human-powered drive system and an electric-motor drive system are provided in parallel, and a planetary speed reducer for reducing the output of the electric motor that constitutes the electric-motor drive system on the outer periphery of a crankshaft that constitutes the human-powered drive system. A bicycle with an electric motor, characterized in that 4. A bicycle with an electric motor in which a human power drive system and an electric motor drive system are provided in parallel with each other, wherein the electric motor constituting the electric motor drive system includes a speed reducing mechanism for reducing the output of the electric motor. With bicycle. 5. The bicycle with an electric motor according to claim 4, wherein a planetary speed reducer is used for the speed reduction mechanism. 6. The bicycle with an electric motor according to claim 4 or 5, wherein the electric motor constituting the electric motor drive system is arranged in the rear tire hub. 7. The electric motor constituting the electric motor drive system is arranged in a front tire hub.
Or a bicycle with an electric motor as described in 5. 8. The bicycle with an electric motor according to claim 4, wherein the electric motor constituting the electric motor drive system is arranged on the outer periphery of the crankshaft constituting the human power drive system. 9. The bicycle with an electric motor according to claim 1, wherein a brushless motor is used as the electric motor.