JPH092369A - Bicycle having auxiliary driving force - Google Patents

Abstract

PURPOSE: To reduce the manufacturing cost, to improve the design, and to improve the safety by devising the constitution of a motor driving system relative to an manual driving system to dispense with a sprocket and a chain for the motor driving system. CONSTITUTION: In a bicycle with the auxiliary driving force to which the auxiliary driving force by a motor, a motor driving system relative to a manual driving system integratedly comprises a battery, a motor 18, and a reduction gear 19. The whole structure of the motor 18, an output rotary shaft 18a, the whole structure of the reduction gear 19, and a sun gear 9a which is an output rotary shaft are provided with a hollow part 34. A crank shall 10a of a pedal 10 is held in the hollow part 34 rotatably through bearings 11-16, and rotated by the sun gear 9a through a unidirectional clutch 12. A stepping force detecting sensor 24 is connected to a rotary ring 24 to detect the tension of an input driving system chain 33 according to the torque of the stepped pedal 10.

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 auxiliary driving force to which an auxiliary driving force is applied by a motor.

[0002]

2. Description of the Related Art Conventionally, a bicycle with an auxiliary drive force to which an auxiliary drive force is applied by a motor has a large sprocket for a human power drive system rotated by a pedal which is stepped on and a rear wheel which is a first wheel shown in FIG. 26 is mounted between the small sprocket 46 for manpower drive system and the large sprocket for manpower drive system and the small sprocket for manpower drive system 46 mounted so as to rotate via the first one-way clutch and the internal speed change device. A human power drive system including a human power drive system chain that rotates the small human power drive system sprocket 46 by the rotation of the system large sprocket and rotates the rear wheels 26 to advance the vehicle body is provided.

Further, a motor 27 driven by a battery, a speed reducer 28, and a motor drive system sprocket 2
9. A motor drive system including a motor drive system sprocket 41 and a motor drive system chain 31 is provided. The rear wheel 26 includes a rear wheel hub 26a and a tire 26.
b, rear wheel spokes 26c, etc. The motor drive system sprocket 29 is mounted on the output rotary shaft of the reduction gear 28, and the motor drive system sprocket 41 is mounted on the rear wheel 26 so as to rotate the rear wheel 26 via the motor drive system one-way clutch. Motor drive chain 3
Reference numeral 1 is hung between the motor drive system sprocket 29 and the motor drive system sprocket 41, and the rotation of the motor drive system sprocket 29 causes the motor drive system sprocket 41 to rotate, thereby rotating the rear wheel 26 so as to advance the vehicle body. .

[0004]

However, the above-mentioned conventional example requires the motor drive system sprocket 29 and the motor drive system sprocket 41 in addition to the large manual drive system sprocket and the small manual drive system sprocket 46. In addition to the manual drive system chain, the motor drive system chain 31 is required, which is not preferable in terms of design, and the manufacturing cost is high. In addition, due to the structure, the motor 27 and the speed reducer 28 project outward, and the center of gravity is high, so that the left and right weight balance is poor, which is inconvenient in design and dangerous in traveling. Therefore, the present invention eliminates the need for a motor drive system sprocket and a motor drive system chain, reduces the manufacturing cost, and is suitable in terms of design without the motor and reducer of the motor drive system protruding outward, and has a low center of gravity. , It is an object of the present invention to provide a bicycle with auxiliary driving force, which has high traveling safety and enables fine motor control with fine grain.

[0005]

According to the present invention, a large sprocket for a human power drive system which is rotated by a pedal which is stepped on and which is provided on a vehicle body, a first wheel and a first one-way clutch and an internal transmission are provided. A small manual drive system sprocket provided on the vehicle body so as to rotate, and a large manual drive system sprocket and the small manual drive system sprocket are hung between the small manual drive system sprocket and the small manual sprocket. A human-powered drive system including a human-powered drive chain that rotates the first wheel to rotate the first wheel, a battery provided in the vehicle body, a motor provided in the vehicle body and rotated by the battery, and A motor drive system including a speed reducer that decelerates rotation to rotate the first wheel, and an auxiliary drive force is provided. In a bicycle, the motor,
Further, the speed reducer is integrally configured, and the entire structure of the motor and the output rotary shaft, and the overall structure of the speed reducer and the output rotary shaft are configured to have a hollow portion. Of the crankshaft is rotatably held in the hollow portion via a bearing, and is held by the output rotation shaft of the reduction gear transmission so as to be rotated via a second one-way clutch. Between the system large sprocket and the small manual drive system sprocket, the manual drive system chain is pressed from above to make contact, and the rotary wheel rotated by the rotation of the manual drive system chain and the rotary wheel are coupled, A detection sensor that outputs the tension of the human power drive system chain according to the torque of the pedal that is stepped on by acting through the rotating wheel; A control device for controlling the rotation of said motor in response to output from the sensor, a bicycle with an auxiliary driving force, comprising the.

[0006]

According to the present invention, the motor of the motor drive system and the speed reducer are integrally formed, and the entire structure of the motor and the output rotary shaft, and the overall structure of the speed reducer and the output rotary shaft are hollow. And a crankshaft of the pedal is rotatably held in the hollow portion via a bearing and is rotated by the output rotary shaft of the speed reducer via a second one-way clutch. Held in. Therefore, the motor drive system sprocket and the motor drive system chain are unnecessary, and the manufacturing cost is reduced. Further, since the motor and the speed reducer of the motor drive system are integrally configured around the crankshaft of the pedal, the configurations of the motor and the speed reducer protruding outward are eliminated, which is preferable in terms of design and also has a center of gravity. It is low and the weight balance on the left and right is good, and driving safety is improved. Further, the rotation of the auxiliary output by the motor is controlled by the control device based on the tension of the human power drive system chain according to the torque of the stepped pedal. Further, the rotation of the auxiliary output by the motor may be controlled by the control device based on the rotation speed of the large sprocket of the human power drive system.
Therefore, finer grain control is performed and the battery can be used more efficiently.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described based on embodiments with reference to the drawings. FIG. 1 is a partial sectional view of an embodiment of the present invention, FIGS. 2 and 3 are partial configuration diagrams, and FIG. 4 is an overall configuration diagram. The vehicle body 30 is provided with a front wheel 36 which is a second wheel and a rear wheel 26 which is a first wheel. The first wheel is usually the rear wheel 26, but the middle wheel,
It may be the front wheel. Large sprocket for human power drive 17
Is rotated by the pedal 10 provided on the vehicle body 30 and stepped on. The human-powered small sprocket 46 is provided on the vehicle body 30 and rotates the rear wheel 26 via a first one-way clutch and an internal transmission which are not shown.
The manpower drive system chain 33 is hung between the large manpower drive system sprocket 17 and the small manpower drive system sprocket 46, and the rotation of the large manpower drive system sprocket 17 causes the small manpower drive system sprocket 46 to rotate and the rear wheel 26. To rotate. The pedal 10, the large manual drive system sprocket 17, the small manual drive system sprocket 46, and the manual drive system chain 33 constitute a manual drive system.

Next, the motor 18 is formed integrally with the speed reducer 19, is provided on the vehicle body 30, and is rotated by a battery (not shown). The motor 18 further includes a rotor yoke 1, a rotor magnet 2, a stator core 3, a stator coil 4, a stator holder 5, a drive unit case 6, and an output rotary shaft 18a. The speed reducer 19 is a device that decelerates the rotation of the motor 18 to rotate the rear wheels 26 that are the first wheels.
It comprises a planetary gear 7, a sun gear 7a, a ring gear 8, a planetary gear 9, a sun gear 9a which is an output rotary shaft, and a second one-way clutch 12. The rotational force of the motor 18 is transmitted through the output rotary shaft 18a, the planetary gear 7, the sun gear 7a, the planetary gear 9, the sun gear 9a as the output rotary shaft, and the second one-way clutch 12 to the crankshaft 10a of the pedal 10.
And further rotates the large sprocket 17 of the human power drive system.

The battery 44, the motor 18 and the speed reducer 19 are integrally formed. Further, the entire structure of the motor 18 and the output rotary shaft 18a, and the overall structure of the speed reducer 19 and the sun gear 9a which is the output rotary shaft are provided. , And has a hollow portion 34. The crankshaft 10a of the pedal 10 is rotatably held in the hollow portion 34 via bearings 11, 13, 14, 15 and 16. The crankshaft 10a of the pedal 10 is further held by the sun gear 9a, which is the output rotation shaft of the reduction gear device 19, so as to be rotated via the second one-way clutch 12.

Next, the rotary wheel 25 presses the human power drive system chain 33 from above between the large human power drive system sprocket 17 and the small human power drive system sprocket 46 so that the human drive system chain 33 is rotated. It is provided to be rotated. In addition, the pedal depression force detection sensor 2
4 is a pedal 10 which is connected to a rotating wheel 24 and is stepped on.
This is a sensor that outputs the tension of the human power drive system chain 33 according to the torque of the above-mentioned acting on the rotating wheel 24. The control device includes a control circuit 40, a pedal depression force detection circuit 42, and a motor drive circuit 43.
The device controls the rotation of the motor 18 according to the output from the pedal depression force detection sensor 24. More specifically, the total output torque of the stepping torque and the output torque of the motor 18, that is, the output torque of the crankshaft 10a of the pedal 10 is always controlled to be a predetermined torque.
Here, the pedal depression force detection sensor 24 is composed of, for example, a load cell or a piezoelectric element.

Further, the crankshaft 10a of the pedal 10
The third one-way clutch 20 is interposed between the large manpower drive system large sprocket 17 and the human power drive system large sprocket 17 so that the human power drive system chain 33 does not loosen even when the large human power drive system sprocket 17 reverses. Is preferred.

Next, there may be a case where a rotational speed detecting means for detecting the rotational speed of the large sprocket 17 for the human power drive system in the direction of advancing the vehicle body 30 is provided. In this case, in addition to the above control, the control device is configured to control the rotation of the motor 18 based on the rotation speed of the large manual drive system sprocket 17 detected by the rotation speed detection means. More specifically, as shown in FIG. 5, the output torque of the motor 18 is set to the rotational speed of the large sprocket 17 of the human power drive system, that is,
Corresponding to the traveling speed of the vehicle body 30, for example, when the traveling speed of the vehicle body 30 is 15 km / h, 100% of the output torque by the above control of the control device is output as it is,
When the traveling speed becomes 20 km / h, about 50% of the output torque of the above-mentioned control of the control device is output without being output, and the traveling speed is
When it becomes 24 km / h, 100% of the output torque by the above control of the control device is completely cut, and the rotation of the motor 18 is controlled to be stopped. By this control, finer grain control is performed, and the battery can be used more efficiently.

More specifically, this rotation speed detecting means is
It is composed of a generator 38 that outputs a pulse signal by rotation of front wheels 36 that are second wheels provided on the vehicle body 30, and a pulse detection circuit 39 that detects this pulse signal and outputs it to the control device. It Further, the rotation speed detection means described above includes a rotation speed detection plate 35 and a rotation speed detection plate 3 which are provided so as to rotate together with the large sprocket 17 of the human power drive system.
5, a plurality of magnets 22 provided in a circular shape around the crankshaft 10a, and a large sprocket 17 for a human power drive system.
In some cases, the magnetic sensor 21 detects the magnetism of a plurality of magnets 22 that are rotated together. In addition, a sensor using a phototransistor or a photoelectric switch may be used as the rotation speed detecting means.

The control device may also have a display unit 45 for displaying the remaining amount of the battery 44. This is a function of notifying the user of the exhaustion of the battery 44. here,
A pulley may be used in place of the large manual drive system sprocket 17 and / or the small manual drive system sprocket 46. Further, a belt may be used instead of the manual drive system chain 33. Further, it is preferable to provide a tension device 23 below the manpower drive system chain 33 for removing looseness of the manpower drive system chain 33. Further, a tension device 23 for removing looseness of the belt may be provided below the belt used in place of the manual drive system chain 33. In this way, the human power drive chain 33
Alternatively, by providing the tension device 20 on the lower side of the belt used in place of the human-powered drive chain 33, the human-powered drive chain 33 is stepped on and off even if the human-power drive chain 33 expands or contracts due to ambient temperature changes, frequency of use, or the like. It is possible to accurately detect the tension of the human power drive system chain 33 according to the torque of the pedal 10. Further, it is possible to enhance the processing accuracy at the time of creating the large manual drive system sprocket 17 and the small manual drive system sprocket 46 and the assembly accuracy at the time of assembly, or to easily perform adjustment.

[0015]

As described above, the present invention eliminates the need for the motor drive system sprocket and the motor drive system chain, reduces the manufacturing cost, and prevents the motor and the reduction gear of the motor drive system from projecting outward. By design,
It is suitable, has a low center of gravity, and has an effect of high traveling safety. In the case of an embodiment in which a tension device is provided on the lower side of a belt used in place of a human power drive system chain or a human power drive system chain, the human power drive system chain is
Even if it expands or contracts due to changes in the ambient temperature or the frequency of use, the tension of the manual drive system chain can be accurately detected according to the torque of the stepped pedal, and the large manual drive system sprocket and the small manual drive system sprocket can be detected. It is possible to enhance the processing accuracy at the time of creating the item and the assembling accuracy at the time of assembling, or to easily perform the adjustment. When the rotation of the auxiliary output by the motor is controlled by the control device based on the tension of the human power drive system chain according to the torque of the stepped pedal, and is also controlled based on the rotational speed of the large sprocket of the human power drive system. There is also
Finer grain control allows more efficient battery use.

[Brief description of drawings]

FIG. 1 is a partial sectional view of one embodiment of the present invention.

FIG. 2 is a partial configuration diagram of an embodiment of the present invention.

FIG. 3 is a partial configuration diagram of an embodiment of the present invention.

FIG. 4 is an overall configuration diagram of an embodiment of the present invention.

FIG. 5 is a graph showing the relationship between speed and auxiliary output ratio of a motor in one embodiment of the present invention.

FIG. 6 is a partial configuration diagram of a conventional example.

[Explanation of symbols]

1 Rotor Yoke 2 Rotor Magnet 3 Stator Core 4 Stator Coil 5 Stator Holder 6 Drive Unit Unit Case 7, 9 Planetary Gear 8 Ring Gear 10 Pedal 10a Crankshaft 11, 13, 14, 15, 16 Bearing 17 Human Power Drive Large Sprocket 12 Second one-way clutch 18a, 19a Output rotary shaft 20 Third one-way clutch 22 Magnet 23 Tension device 24 Pedal pedal force detection sensor 25 Rotating wheel 26 Rear wheel 30 Body 34 Hollow part 35 Rotation speed detection plate 36 Front wheel 38 Generator 39 Pulse detection circuit 40 Control circuit 42 Pedal pedal force detection circuit 43 Motor drive circuit 44 Battery 45 Display 46 Human power drive system small sprocket

Claims (10)

[Claims] 1. A large sprocket for human power drive provided on a vehicle body and rotated by a foot pedal, and a first wheel provided on the vehicle body for rotation via a first one-way clutch and an internal transmission. A small sprocket of a human power drive system, and a large sprocket of the human power drive system and a small sprocket of the human power drive system, which are rotated by the rotation of the large sprocket of the human power drive system to rotate the small sprocket of the human power drive system. A human-powered drive system including a human-powered drive chain that rotates wheels, a battery provided in the vehicle body, a motor provided in the vehicle body and rotated by the battery, the rotation of the motor is decelerated, and the first motor is provided. A bicycle with an auxiliary driving force including a motor drive system including a speed reducer for rotating the wheels of The motor and the speed reducer are integrally configured, and the overall structure and output rotary shaft of the motor, and the overall structure and output rotary shaft of the speed reducer are configured to have a hollow portion. A crankshaft of the pedal is rotatably held in the hollow portion via a bearing, and is held by the output rotation shaft of the reduction gear transmission to be rotated via a second one-way clutch; Between the large human-powered drive system sprocket and the small human-powered drive system sprocket, the human-powered drive system chain is pressed from above to make contact, and the rotary wheel that is rotated by the rotation of the human-powered drive system chain is connected to the rotary wheel. And the pedal tension output by the tension of the human-power drive system chain acting according to the torque of the pedal pedaled through the rotating wheel. A bicycle with auxiliary driving force, comprising: a force detection sensor; and a control device that controls rotation of the motor according to an output from the pedal depression force detection sensor. 2. The bicycle with auxiliary driving force according to claim 1, wherein the pedal depression force detection sensor includes a load cell or a piezoelectric element. 3. The bicycle with auxiliary driving force according to claim 1, wherein a third one-way clutch is interposed between the crankshaft of the pedal and the large sprocket for the human power drive system. 4. A rotation speed detecting means for detecting a rotation speed of the large sprocket for the human power drive system in a direction of advancing the vehicle body, wherein the control device detects the human power drive system detected by the rotational speed detection means. 2. The rotation of the motor is controlled based on the rotation speed of a large sprocket.
The bicycle with auxiliary driving force according to any one of 1 to 3. 5. The rotation speed detection device comprising: a generator that outputs a pulse signal by rotation of a second wheel provided on the vehicle body; and a pulse detection circuit that detects the pulse signal and outputs the pulse signal to the control device. A bicycle with auxiliary driving force according to any of claims 1 to 4, wherein the means are constructed. 6. A rotation speed detection plate provided so as to rotate together with the large sprocket of the human power drive system, a plurality of magnets circularly provided on the rotation speed detection plate around the crankshaft, and the human power The bicycle with an auxiliary drive force according to any one of claims 1 to 4, wherein the rotation speed detection means is composed of a magnetic sensor that detects the magnetism of the plurality of magnets that are rotated together with the drive system large sprocket. 7. The bicycle with auxiliary driving force according to claim 1, wherein the control device has a display unit that displays the remaining amount of the battery. 8. The bicycle with auxiliary driving force according to claim 1, further comprising a tension device provided below the human-powered drive chain to remove looseness of the human-powered drive chain. 9. The bicycle with an auxiliary drive force according to claim 1, wherein a pulley is used instead of the large sprocket and / or the small sprocket of the human power drive system, and the chain of the human power drive system is replaced. A bicycle with auxiliary driving force, which is characterized by using a belt for the vehicle. 10. The bicycle with an auxiliary driving force according to claim 9, further comprising a tension device provided under the belt to remove looseness of the belt.