JPH07187053A - Motor-driven bicycle - Google Patents

Abstract

PURPOSE:To manufacture a motor-driven bicycle simply through the addition of necessary members without any change in the structure of the bicycle by distributing the driving torque of a DC electric motor on the basis of an established ratio at all times, so as to correspond to driving torque generated on the operation of a foot pedal. CONSTITUTION:An outer enclosure 47 is mounted on a bicycle body under a carrier 6b. The enclosure 47 houses a DC electric motor, the power control circuit thereof and a reduction gear device as a drive source for the operation of a sprocket 46 via the output power thereof. A chain 4 is thereby driven and a rotor in pressed contact with the upper center section of the chain 4 is detected in terms of vertical motion due to an increase or decrease in the tension of the chain 4 on the operation of foot pedals 2a, 2b, 3a and 3b. Also, this device is used to control power fed from the on-vehicle storage battery of the DC electric motor 47, or output torque. According to this construction, a travel on the operation of the pedals 2a, 2b, 3a and 3b is effectuated by the same means as conventional, and travel function on the operation of the motor 47 is added.

Description

Detailed Description of the Invention

[0001]

[Field of Industrial Application] It is used in addition to a well-known foot-operated bicycle and an electric bicycle that can be advanced by the driving force of a DC motor.

2. Description of the Related Art An electric bicycle in which a DC electric motor and a storage battery are placed on a pedal-operated bicycle and the electric motor is driven by the petal and the DC electric motor is well known, and there are examples of its implementation.

[0002]

[Problems to be Solved by the Invention]

The first problem is to construct an electric bicycle with only additional mounting members without changing the conventional bicycle mechanism. Second problem When traveling only with pedaling petals,
It is necessary to prevent the driving feeling from changing without the DC motor and its speed reducer becoming a load. Third Problem It is necessary to be able to travel using both the pedal pedal and the driving force of the DC motor in combination or with only the petal. Fourth problem When changing and selecting the first mode in which only pedaling petals are used and the second mode in which both are used together, it is difficult to use if there is a special manual operation, especially in the case of elderly children. There is a problem that induces.

[0003]

[Means for Solving the Problems]

First Means A bicycle provided with a large sprocket driven by a foot pedal, a small sprocket driving a rear wheel shaft via a one-way clutch, and a chain hung between the large sprocket and the small sprocket. In, a vehicle-mounted storage battery housed in a first outer casing fixed to the body of the bicycle, a DC motor housed in a second outer casing, and a speed reducer driven by the output rotary shaft thereof,
Means for fixing the second outer casing to the frame of the vehicle body, an output sprocket mounted on the output rotation shaft of the speed reducer via a one-way clutch, and rotatably supported by the support shaft on the second outer casing. A rotatable wheel rotatably supported by the free end of the lever, and a chain spanned between the outer circumference of the large sprocket and the rotating wheel, the outer circumference opposite to the output sprocket, and the outer circumference of the small sprocket side. Drive device that drives the rear wheels in the direction in which the bicycle moves forward, an elastic member that repels the rotating wheels so as to press against the chain, and foot pedals that are driven by leg force to apply tension to the chain and rotate. An electric switch that operates when a wheel moves, an on-vehicle storage battery that supplies power to a DC motor via the electric switch, an armature current detection device for the DC motor, and a series connection body of the device and the DC motor. An electric circuit that receives the reference voltage that changes corresponding to the flywheel diode that is reversely connected in parallel and is supplied from the onboard storage battery by changing the resistance value of the variable resistor, the reference voltage and the armature current. The detection voltage of the detection device is compared, and when the latter voltage exceeds the former voltage, the transistor inserted between the DC motor and the onboard storage battery is turned into non-conduction, and when the armature current drops to a predetermined value, the transistor is turned on. By manually rotating the grip of the chopper circuit and the handle that electrically connects the above, the variable resistance stored inside is changed, the reference voltage is increased in response to the rotation, and the hand is released from the grip. It is composed of a device that springs back to reduce the reference voltage. Second Means In a bicycle provided with a large sprocket driven by a foot pedal, a small sprocket driving a rear wheel shaft via a one-way clutch, and a chain hung between the large sprocket and the small sprocket described above. A vehicle-mounted storage battery housed in a first housing fixed to the body of the bicycle, a DC motor housed in a second housing, and a speed reducer driven by the output rotary shaft thereof;
Means for fixing the outer casing to the frame of the vehicle body, an output sprocket mounted on the output rotation shaft of the reduction gear via a one-way clutch, and a second outer casing rotatably supported by a support shaft. By a rotating wheel rotatably supported on the free end of the lever, and a chain hung between the outer circumference of the large sprocket and the rotating wheel, the outer circumference on the opposite side of the output sprocket, and the outer circumference of the side surface of the small sprocket. A drive device that drives the bicycle in the forward direction, an elastic member that repels the rotating wheel so as to press it against the chain, and a foot pedal that is driven by leg force to apply tension to the chain and move the rotating wheel. At times, the electric switch is closed to change the electric resistance according to the movement amount, the on-vehicle storage battery for supplying the DC motor with the electric switch via the electric switch, and the armature current detection device for the DC motor. In addition, a flywheel diode reversely connected in parallel to the series connection body of the device and the DC motor, and power is supplied from the vehicle-mounted storage battery, and the resistance value of the variable resistor is changed to change correspondingly. Compare the reference voltage with the detection voltage of the armature current detection device, and if the latter voltage exceeds the former voltage, turn off the transistor inserted between the DC motor and the onboard battery. And the armature current drops to a predetermined value, the chopper circuit makes the transistor conductive.

[0004]

The pedal has the function of adding a device for carrying out the following action to a known bicycle which moves forward by the pedaling pedal and stops when it is stopped, and has the action of operating the bicycle without changing the driving feeling. When a part of the grip of the steering wheel is rotated, the driving torque of the DC motor is increased in accordance with the rotation angle, and the vehicle travels. This traveling is performed only in combination with the traveling with the pedal pedal. By eliminating the above-mentioned action of the handle grip, the drive torque of the DC motor is increased corresponding to the drive torque obtained by the pedal pedal, and both drive torques can be always distributed at a set ratio to run. is there. Since the electric bicycle can be configured only by the additional member without changing the configuration of the conventional bicycle, it can be manufactured at low cost. Because of the above-described effects, the first, second, third, and fourth problems can be solved.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a drawing in which the device of the present invention is added to a bicycle, and other known parts are omitted and not shown. Symbol 2
Reference numerals 4a, 24b, 24c and 24d are schematic representations of the triangular frame of the bicycle body. The arrow C indicates the traveling direction.
Foot pedals 3a, 3b are rotating arms 2a, 2b
Is supported by a support shaft at its end, and the arm 2a is linearly held by the support body, and the arm 2b is also held linearly by the support body of the same structure via the rotary shaft 1. The rotating shaft 1 of the arms 2a, 2b is rotatably supported by a bearing at the joint of the frames 24a, 24b, 24e, and the sprocket 6 having a large diameter is configured to rotate synchronously with the arms 2a, 2b. A hub of a rear wheel 10 is rotatably supported by a support shaft 5 at a connecting portion of the frames 24a and 24c via a bearing, and a sprocket 8 having a small diameter is mounted on the hub. Press the petal 3a in the direction of arrow A to move the sprocket 6 in the direction of arrow B.
When rotated in the direction, the chain 4 hooked on the sprockets 6 and 8 causes the sprocket 8 to rotate counterclockwise.

At this time, since the rear wheels 10 are also driven in the same direction, the bicycle runs in the direction of arrow C. When the petals 3a, 3b are stopped and held, the one-way clutch provided on the sprocket 8 slides and the bicycle runs inertially. Reference numeral 24 is a saddle, and reference numerals 6a and 6b are loading platforms. Although not shown, an outer casing is mounted below the loading platform 6b, and an in-vehicle storage battery is housed inside the outer casing.

The outer casing 47 is fixed to the frames 24c and 24b. The fixing means is not shown but may be any known means. A DC motor (flat coreless motor), an energization control circuit for the DC motor (flat coreless motor), and a reduction gear device are housed in the outer casing 47, and an output rotation shaft 46a of the reduction gear device is led out to the back surface, and a sprocket 46 is mounted on the output rotation shaft 46a. A lever 13 shown by a dotted line is rotatably supported on a support shaft 13a provided on the back surface of the outer casing 47, a sprocket 7 is rotatably supported on a support shaft 7a of the lever 13, and the sprocket 7 is attached to the chain 4. It meshes and presses it upwards. Such a mechanism will be described in detail later with reference to FIG. The storage battery described above may be mounted in the space between the frame 24d and the frame 24e. As shown, the chain 4 includes a large sprocket 6, an upper side of the sprocket 7, a lower side of the sprocket 46,
It is hung between the small sprockets 8.

FIG. 2 shows details of a portion of the outer casing 47. Although the electric motor housed in the outer casing 47 and its reduction gear are not shown, the sprocket 46 is fixed to the output rotation shaft 46a of the reduction gear and meshes with the chain 4. A lever 13 is rotatably supported on a support shaft 13a provided on the back surface of the outer casing 47, and a sprocket 7 is rotatably supported on a support shaft 7a of the lever 13 and is pressed against the chain 4 from below. . The sprocket 7 may be a disc-shaped rotating body, and the sprocket 7 presses the chain 4 by a spring that repels the lever 13 in the arrow D direction. Lever 13
A member indicated by reference numeral 12 is provided at the free end of
The details will be described below with reference to FIG.

In FIG. 3, the right end of the electrical contact piece 14 is fixed to the free end of the metal lever 13. Outer housing 47
A thin piece provided with a resistor 12 on the surface is fixedly attached to, and the terminal 14b is led out from the left end thereof. The terminal 14 a is led out from the lever 13. When the lever 13 rotates in the direction of the arrow E, the resistance value between the terminals 14a and 14b decreases, and the electric contact piece of the electric switch 31 is pressed against the end portion of the lever 13 and held closed in the initial stage of the rotation. . As can be understood from the above description, when the pedals 3a and 3b of FIG. 1 are stepped on by the foot to apply tension to the chain 4, the lever 13 rotates counterclockwise and the electric switch 31 closes.
The resistance between a and 14b decreases.

Next, the energizing means of the electric motor 34 will be described with reference to FIG. In FIG. 4, symbols 12a and 12b are positive and negative electrodes of the on-vehicle storage battery. The motor 34 and the resistor 16b for detecting the armature current are connected in series, and the flywheel diode 26 is connected in parallel to the series connection body of the motor 34 and the resistor 16b. The variable resistor 16 and the resistor 16a are connected in series and supplied with power from the positive and negative electrodes 12a and 12b. When the armature current increases and the voltage drop of the resistor 16b exceeds the voltage drop of the resistor 16a, the output of the operational amplifier 27 serving as a comparison circuit becomes low level, and the transistor 28 is turned off. The transistor 28 may be another semiconductor switching element. Therefore, the magnetic energy in the armature coil is discharged through the diode 26 and the armature current is reduced.
When the voltage decreases to a predetermined value, the output of the operational amplifier 27 is converted to a high level due to the hysteresis characteristic, so that the transistor 28 becomes conductive and the armature current increases. Since the chopper circuit repeats such a cycle, the resistor 16a
Voltage drop, that is, the armature current corresponding to the reference voltage.
In the present embodiment, the armature current detecting device using the resistor 16b is used, but well-known means may be used. Since the voltage drop of the resistor 16a can be controlled by changing the resistance value of the variable resistor 16, the output torque of the electric motor 34 is the variable resistor 16a.
Can be controlled by.

There are three means for controlling the variable resistor 16. The first means utilizes the resistor 12 described in FIG. 3, and the second means utilizes the rotation of the grip shown in FIG. The third means is the changeover switch 3 of FIG.
5 is used. The first means will be described.
When the petals 3a and 3b of FIG. 1 are stepped on, tension is generated in the chain 4, so that the lever 13 of FIG. 2 rotates counterclockwise, and the resistance between the terminals 14a and 14b of FIG. 3 decreases. The electric switch 31 shows the electric switch 12c of FIG. Therefore, the supply of electric power to the electric motor 34 is started, and thereafter, the resistance between the terminals 14a and 14b decreases corresponding to the force of stepping on the petal. Since this resistance is the resistance 16 in FIG. 4, the driving torque of the chain by the sprocket 46 in FIG. 2 is increased and the bicycle can be run. By making the resistance value of the resistor 12 non-linear without changing linearly, the ratio of the additional torque by the electric motor and the leg force stepped on by the foot can be freely changed.

Next, the second means will be described. FIG. 7 shows the grip of the handle, and the handle arm 18
The grip 17 is divided into two parts, the grip 17a is fixed to the handle arm 18, and the grip 17b is manually rotatable around the handle arm 18. At the left end of the grip 17b is provided a cylindrical housing 19 accommodating a member including the variable pile 16, and the center portion of the left side plate is fixed to the handle arm 18. A plan view of FIG. 7 viewed from the direction of arrow E is shown in FIG. Case 19
Are shown as cross sections. In FIG. 8, a sleeve 21a is arranged so that it can be slidably rotated around a hollow handle arm 18, and a cylindrical rotation that serves as a left extension of the grip 17b (shown in FIG. 7) is provided outside the sleeve 21a. The body 21 is fixed and rotates in synchronization with the grip 17b. A resistor film is applied to the outer peripheral surface of the rotating body 21 (insulator). A slider 20 having a base fixed to the inside of a housing 19 having a cylindrical shape slides on the above-mentioned film. The left end of the metal spring 22 is fixed to the outside of the rotating body 21, and the right end of the metal spring 22 is fixed to the inside of the housing 19 to repel the rotating body 21 in the counterclockwise direction, and the protruding portion 22b of the rotating body 21 and the housing 19 are fixed. The protrusions 22a are in contact with each other to prevent rotation.

When the grips 17a and 17b shown in FIG. 7 are gripped with a hand and the grip 17b is rotated, the rotating body 21 shown in FIG. 8 rotates clockwise.
The resistance value of 3b decreases. This is terminal 23a, slider 2
This is because the resistance value between 0 and the left end of the spring 22 decreases. When the hand is released from the grip 17b, the rotating body 21 springs back to the position shown in the figure, so that the resistance becomes the maximum value. This variable resistor is the variable resistor 16 in FIG. As can be understood from the above description, when the power switch 12c of FIG. 4 is closed, a small amount of current flows through the electric motor 34. However, when the grip 17b of FIG. 7 is manually rotated, it corresponds to the rotation angle of FIG. The voltage drop of the resistor 16a, that is, the reference voltage increases, the armature current increases in proportion to this, and the output torque increases. Therefore, the required output torque can be obtained by operating the hand that holds the steering wheel while running.
It is possible to obtain the effect that the traveling of the bicycle can be controlled at a required speed. When the hand is released from the grip 17b, spring back occurs and the output torque almost disappears.

The open / close electric switch 12c of FIG. 4 shows the electric switch 31 of FIG. 3, and when the petal is driven by the foot, the tension of the chain 4 increases and the lever 13 rotates counterclockwise. The actuator of the electric switch 31 is pressed to close it. That is, since the electric switch 12c of FIG. 4 is closed, the electric power supply to the electric motor 34 is started. As described above, the electric motor 34 is closed only when the petal is driven. It is also possible to add the means shown in FIG. FIG. 9 shows only the vicinity of the protrusions 22a and 22b of FIG. In FIG. 9, the protruding portion 22a is made of a plastic material, the base portion is fixed to the housing 19, and the right end of the metal leaf spring 29 is fixed to the outer housing 19 and the protruding portion 22a. The right end of the leaf spring 29 serves as a terminal 29a, and the electric contact 29b is provided on the left side. The metal plate 30 is embedded in the central portion of the protruding portion 22a and the right end serves as the terminal 30a. The left end serves as an electric contact 30b, and the electric contacts 29b and 30b are pressed against each other. When the rotating body 21 rotates counterclockwise and springs back,
The protrusion 22b presses the left end of the bent portion of the leaf spring 29 to separate the electric contacts 29b and 30b. Terminals 29a, 3
0a is inserted in series with the electric switch 12c of FIG. With the above configuration, when the grip 17b is manually rotated,
When the output torque of the electric motor 34 is increased and the hand is released from the grip 17b, the rotating body 21 springs back and the electric switch 12c shown in FIG. 4 is automatically opened. Therefore, it is possible to prevent the on-vehicle storage battery from being consumed when the bicycle is left unattended.

Next, the third means will be described. Resistor 1 in Figure 4
6 is removed, and instead, a changeover switch 35 for changing over three resistors is added as shown by a dotted line. The resistance values of the resistors 41a, 41b, 41c are sequentially increased. The resistor 41a having the minimum resistance value at the start of running
Is manually selected by the changeover switch 35, the torque by the largest electric motor is added, so that the acceleration of traveling becomes easy. Next, the changeover switch 35 causes the resistor 41
Since the running torque by the electric motor can be reduced by sequentially switching to b and 41c, there is an effect that the running can be carried out in balance with the leg force.

The traveling speed detecting device shown in FIG. 6 will be described. A small gear 34b is fixed to a rotary shaft 34a of an electric motor 34 housed in an outer casing 47, and a large gear 36 meshes with the small gear 34b.
Is rotatably provided by a rotary shaft 36a. Gear 3
The rotary shaft 36a of No. 6 is equipped with several reduction gears, and the sprocket 46 of FIG. 2 is fixed to the output rotary shaft 46a. A ferrite magnet 37 having N and S magnetic poles with a width of 90 degrees is fixed to the surface of the gear 36, and fan-shaped coils 39a, 39b, 39c opposed to the ferrite magnet 37 via a gap.
Are fixed to the iron plate 38 as shown.

When the gear 36 rotates, a three-phase electromotive force proportional to the rotation speed thereof is generated in the coils 39a, 39b, 39c. Therefore, it is proportional to the rotation speed by utilizing six diodes and a smoothing capacitor by known means. The rotation speed detecting device can be obtained. This speed detecting device is shown as symbol 39 in FIG. The output of the speed detection device 39 is converted to a high level when the traveling speed exceeds the set value, and the transistor 28a is turned on.
The input of the + terminal of becomes low level and its output becomes low level. Therefore, the transistor 28 is turned off and the electric motor 34 is stopped. Such means are necessary for safe traveling. By switching the resistances of the resistors 41a, 41b, 41c by the output of the speed detection device 39, the ratio of the running torque by the electric motor and the running torque by the leg force can be automatically and sequentially changed as the running speed increases. . For example, the torque generated by the electric motor is maximized at the start of running, and at a speed of 15 km / h,
2 and can be zero at a speed of 24 km / h.
By such means, it is possible to obtain an electric bicycle that can be used without a driving license.

The effect of using a reluctance type electric motor as an electric motor as a drive source will be described. FIG. 5 shows a torque characteristic of the reluctance type electric motor, which is shown by a curve 32. The horizontal axis is the current flowing, and the vertical axis is the output torque. As the current increases, the torque increases on the quadratic curve and then increases linearly until the armature coil burns out. In the known DC motor, the maximum torque is obtained in the vicinity of the dotted line 32a where the magnetic pole is magnetically saturated. In the case of a reluctance type electric motor, since there is no saturation point described above, the same type of output torque is about 10 times higher. However, since the armature coil is burnt out, it is effective to adopt the following means.
When the electric switch 12c of FIG. 4 is closed to drive the bicycle, the charging current of the capacitor 33 causes the transistor 2
8 conducts, the maximum current is supplied to the electric motor 34 without being affected by the chopper circuit by the operational amplifier 27, the base current of the transistor 28 disappears as the capacitor is charged, and the chopper circuit is supplied. Therefore, it becomes an effective means when the bicycle is rapidly accelerated by the electric motor. The high resistance placed in parallel with the capacitor 33 is the electric switch 12c.
Is for discharging the capacitor 33 when opened, and for accelerating rapidly when closed. As can be understood from the above description of each embodiment, the object of the present invention can be achieved. Although the above embodiment is for a two-wheeled vehicle, the present invention can be implemented by the same means even for a three-wheeled bicycle having two rear wheels. Especially for elderly bicycles, a three-wheeled bicycle is an effective means.

[0019]

The device of the present invention has the effect that an electric bicycle can be manufactured by adding the required members without changing the structure of the bicycle. As can be understood from the above description, it is possible to obtain a means for traveling by using only the leg force of the petal, a means for traveling by using an electric motor, and a means for traveling both together, and stop each means. Then, the vehicle can run due to inertia. If necessary, a means for manually or automatically changing the running torque of the electric motor in accordance with the running speed can be added. When traveling by inertia, it is possible to double the traveling distance by inertial traveling on a flat ground and a downhill. The operation can be facilitated because the inertia traveling mode can be converted by merely stopping the force of stepping on the petal with the foot or releasing the hand from the grip 17b. There is an effect that the selection means for using both the leg force and the torque by the electric motor as well as the inertial running are compatible with the natural motion of a human, and the running by the electric bicycle can be easily performed.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a device of the present invention.

FIG. 2 is an explanatory diagram of an outer casing 47.

FIG. 3 is an explanatory diagram of a lever 13.

FIG. 4 is a circuit diagram for controlling the energization of the electric motor.

[Fig. 5] Graph of electric current and torque of electric motor

FIG. 6 is an explanatory diagram of a rotation speed detection device of an electric motor 34.

FIG. 7 is an explanatory view of a grip

FIG. 8 is an explanatory diagram of the internal configuration of the grip.

FIG. 9 is an explanatory diagram of a configuration of protrusions 22a and 22b.

[Explanation of symbols]

 24a, 24b ,. Resistance 14 Electric contact piece 31 Electric switch 34 Electric motor 7a, 34a, 36a, 46a Rotation shaft 39 Rotation speed detection device 12a, 12b Storage battery positive / negative terminal 32 Torque curve 10 Rear wheel 1,5 Spindle 17a, 17b Grip 18 Handle arm 20 Slider 21a Rotating body 22a, 22b Projection portion 22 Spring

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[Procedure amendment]

[Submission date] February 21, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0003

[Correction method] Change

[Correction content]

[0003]

[Means for Solving the Problems] First Means A large sprocket driven by a foot pedal, a small sprocket driving a rear wheel shaft via a one-way clutch, and the large sprocket and the small sprocket described above. In a bicycle equipped with a chain that is hung, driven by a vehicle-mounted storage battery housed in a first housing fixed to the body of the bicycle, a DC electric motor housed in a second housing, and its output rotary shaft. A reduction gear, means for fixing the second outer casing to the frame of the vehicle body, an output sprocket mounted on the output rotation shaft of the reduction gear via a one-way clutch, and a second outer casing rotated by a support shaft. A rotating wheel rotatably supported on the free end of a lever movably supported, the large sprocket, the outer circumference of the rotating wheel, the outer circumference opposite to the output sprocket, and the small sprocket. A drive device that drives the rear wheels in the direction in which the bicycle moves forward with a chain that is hung between the outer circumference of the surface, an elastic member that elastically elastically presses the rotating wheels into contact with the chain, and a foot pedal that is driven by leg force. An electric switch that is activated when tension is applied to the chain to move the rotating wheel, an on-vehicle storage battery that supplies power to the DC motor through the electric switch, an armature current detection device for the DC motor, and the device. A flywheel diode reversely connected in parallel to the series connection body of the DC motor, an electric circuit that is supplied from an onboard storage battery to obtain a reference voltage, and the reference voltage and the detection voltage of the armature current detection device are compared. When the voltage exceeds the former voltage, the transistor inserted between the DC motor and the onboard storage battery is turned into non-conduction, and when the armature current drops to a predetermined value, the transistor The chopper circuit that makes the switch conductive and the device that increases the reference voltage in response to the rotation by manually rotating the grip of the handle and reduces the reference voltage by springing back when the hand is released from the grip. It is composed. Second means In a bicycle provided with a large sprocket driven by a pedaling pedal, a small sprocket driving a rear wheel shaft via a one-way clutch, and a chain hung between the large sprocket and the small sprocket described above. A vehicle-mounted storage battery housed in a first outer casing fixed to the body of the bicycle, a DC motor housed in a second outer casing, and a speed reducer driven by the output rotary shaft of the DC motor;
Means for fixing the outer casing to the frame of the vehicle body, an output sprocket mounted on the output rotation shaft of the reduction gear via a one-way clutch, and a second outer casing rotatably supported by a support shaft. By the rotating wheel rotatably supported on the free end of the lever, and the chain hung between the outer circumference of the large sprocket and the rotating wheel, the outer circumference on the opposite side of the output sprocket, and the outer circumference of the side surface of the small sprocket. A drive device that drives the bicycle in the forward direction, an elastic member that elastically presses the rotating wheel to press it against the chain, and a foot pedal that is driven by leg force to apply tension to the chain and move the rotating wheel. Sometimes an electric switch is closed to obtain an electric signal corresponding to the amount of movement, an on-board storage battery that supplies the DC motor via the electric switch, and an armature current detection device for the DC motor. A flywheel diode reversely connected in parallel to a series connection body of the device and a DC motor, an electric circuit supplied with power from a vehicle-mounted storage battery, and obtaining a reference voltage which is changed in response to a change in the electric signal, and a reference voltage. And the voltage detected by the armature current detection device are compared, and when the voltage of the latter exceeds the voltage of the former, the transistor inserted between the DC motor and the onboard storage battery is converted to non-conduction, and the armature current reaches a predetermined value. It is configured by a chopper circuit that makes the transistor conductive when it drops.

Claims (2)

[Claims] 1. A large sprocket driven by a foot petal, a small sprocket driving a rear wheel shaft via a one-way clutch, and a chain hung between the large sprocket and the small sprocket. In a bicycle, a vehicle-mounted storage battery housed in a first housing fixed to the body of the bicycle, a DC motor housed in a second housing and a speed reducer driven by the output rotary shaft of the vehicle, and a second outer housing. The means for fixing the housing to the frame of the vehicle body, the output sprocket mounted on the output rotation shaft of the speed reducer via the one-way clutch, and the lever rotatably supported by the support shaft on the second outer housing. The rotating wheel rotatably supported on the free end, and the large sprocket, the outer circumference of the rotating wheel, the outer circumference on the opposite side of the output sprocket, and the small sprocket side surface outer circumference. A drive device that drives the rear wheels in the direction in which the bicycle moves forward by the chain, an elastic member that repels the rotating wheels so as to press against the chain, and a foot pedal that is driven by the leg force to provide tension to the chain, An electric switch that operates when the rotating wheel moves, an on-vehicle storage battery that supplies power to the DC motor via the electric switch, an armature current detection device for the DC motor, and a reverse connection in parallel with the series connection body of the device and the DC motor. The connected flywheel diode and the electric circuit that is supplied from the vehicle-mounted storage battery and changes the resistance value of the variable resistor to obtain the reference voltage that is changed corresponding to this, the reference voltage and the armature current detection device. The detected voltage is compared, and when the latter voltage exceeds the former voltage, the transistor inserted between the DC motor and the onboard storage battery is converted to non-conduction, and the armature There a chopper circuit allowed to conduct the transistor when lowered to a predetermined value,
By manually rotating the grip of the handle, the variable resistance stored inside is changed to increase the reference voltage in response to the rotation. An electric bicycle characterized by being configured with a reducing device. 2. A bicycle having a large sprocket driven by a foot pedal, a small sprocket driving a rear wheel shaft through a one-way clutch, and a chain hung between the large sprocket and the small sprocket. A vehicle-mounted storage battery housed in a first housing fixed to the body of a bicycle, a DC motor housed in a second housing, and a speed reducer driven by an output rotary shaft of the DC motor;
Means for fixing the outer casing to the frame of the vehicle body, an output sprocket mounted on the output rotation shaft of the reduction gear via a one-way clutch, and a second outer casing rotatably supported by a support shaft. By a rotating wheel rotatably supported on the free end of the lever, and a chain hung between the outer circumference of the large sprocket and the rotating wheel, the outer circumference on the opposite side of the output sprocket, and the outer circumference of the side surface of the small sprocket. A drive device that drives the bicycle in the forward direction, an elastic member that repels the rotating wheel so as to press it against the chain, and a foot pedal that is driven by leg force to apply tension to the chain and move the rotating wheel. At times, the electric switch is closed to change the electric resistance according to the movement amount, the on-vehicle storage battery for supplying the DC motor with the electric switch via the electric switch, and the armature current detection device for the DC motor. In addition, a flywheel diode reversely connected in parallel to the series connection body of the device and the DC motor, and power is supplied from the vehicle-mounted storage battery, and the resistance value of the variable resistor is changed to change correspondingly. Compare the reference voltage with the detection voltage of the armature current detection device, and if the latter voltage exceeds the former voltage, turn off the transistor inserted between the DC motor and the onboard battery. And a chopper circuit that makes the transistor conductive when the armature current drops to a predetermined value.