JP2000095177A - Motor drive power assist unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor drive power assist unit with a simple construction built at a low manufacturing cost, that is easy to mount on a bicycle or any other vehicle, and efficiently provides a human power drive with an auxiliary drive force to reduce the human effort, and ensures a safe ride of a bicycle or other vehicle. SOLUTION: This motor drive power assist unit is mounted on a bicycle or other human power-driven vehicle and, by means of its tire contact drive system, provides power assist for a human power drive. This unit comprises: a fixing portion 12 that is equipped with fixing means 11 for securing it to the main body of the human power-driven vehicle; a drive portion 13 that is mounted to said fixing portion in a manner that it can move circularly either forward or backward and that is equipped with a roller 134 which is pressed tightly against a drive motor 131 and a tire 2 to assist power to turn a rear wheel, and that is formed by a drive motor pulley 132 and a roller pulley 135 around which a belt or a chain 136 is wound to transmit rotation of the drive motor to the roller 134; and, a spring means 14 that applies force to position said fixing portion 12 and drive portion 13 with a predetermined distance away from each other to ensure that the roller 134 is in contact with the tire 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric driving force assisting device which is easily mounted on a manually driven vehicle such as a bicycle or a wheelchair, and which assists manual driving under a constant condition by a tire contact driving method.

[0002]

2. Description of the Related Art In recent years, various devices and methods have been proposed for reducing the human power by supplying an auxiliary driving force by an electric motor to the manual driving of a bicycle or the like. These are disclosed in Japanese Patent Application Nos. 10-73046, 4-244496, and 7-315280 proposed by the present applicant. In order to overcome the various drawbacks of the devices and methods disclosed therein, such as the fact that the driving force is not efficiently transmitted as the traveling force, the driving force transmission structure is complicated, and the like, Japanese Patent Application No. 10-189626 discloses An electric driving force assist device using the tension of the chain has been proposed.

However, in Japanese Patent Application No. Hei 10-189626 proposed by the present applicant, a configuration in which a sprocket gear is meshed with a chain, and a roller is pressed against a tire by displacement of the chain due to tension of the rear wheel to assist the rear wheel. As a result, the structure becomes complicated, and time and labor are required for attaching and detaching to and from a bicycle or the like.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has a simple structure, a low manufacturing cost, and is easily mounted on a bicycle or the like.
It is an object of the present invention to provide an electric driving force assisting device capable of efficiently supplying auxiliary driving force to human driving as needed to reduce manpower and ensure safe running of a bicycle or the like.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the electric driving force assisting device according to the present invention is applicable to a human-powered vehicle such as a bicycle as shown in FIGS. An electric driving force assisting device that is mounted and assists manual driving by a tire contact driving method, a fixing portion 12 having fixing means 11 for fixing to a manually driven vehicle body, and is rotatably attached to the fixing portion 12. , Drive motor 131
And a roller 1 for pressing the rear wheel by pressing against the tire 2
, And a drive motor pulley 132 and a roller pulley 135 that transmit the rotation of the drive motor 131 to the roller 134.
A driving unit 13 wound by a roller 13
A spring means 14 is provided for urging the fixing portion 12 and the driving portion 13 so as to be positioned at a predetermined interval in order to guarantee a state in which the tire 4 is in contact with the tire 2.

According to the first aspect of the present invention, when the driver steps on the pedal to run the bicycle, the auxiliary driving by the driving motor 131 starts, and the driving unit 13 is driven by the torque of the driving motor. Roller 134 can bite into the rear wheel tire 2 to reliably drive the rear wheel. Thereafter, when the running speed becomes constant and the rear wheel rotates at high speed, the roller 134 is displaced in a direction away from the tire 2 and does not hinder the running.

As shown in FIGS. 4 and 5, the electric driving force assisting device according to a second aspect of the present invention includes a human-powered torque sensor 21 for detecting a human-powered torque in addition to the features of the first aspect. Speed sensor 2 for detecting the running speed
2, a comparison means 23 for comparing the signal output obtained therefrom with the rotation of the motor, and a storage means 24 for storing the ratio of the auxiliary driving force to the human power and the control conditions suitable for the use environment.
And an operation unit 25 for calculating an output of the comparison unit 23 and an output of the storage unit 24; and a drive control unit 26 for controlling driving by the output of the operation unit 25. Based on the output, the drive motor 13
1 is characterized in that the start and stop and the control of the auxiliary drive amount by the drive motor 131 are performed.

According to the second aspect of the present invention, the human-powered torque sensor 21 (21A, 21B, 21C,
According to 21D), when the manual torque is detected, the drive motor 131 is started in response to the signal, and thereafter, the output amount of the drive motor corresponding to the detected manual torque amount is controlled. The traveling speed sensor 22 (22A, 22B, 2
2C, 22D, and 22E), when the traveling speed is detected, this signal is received, and the driving motor 1 corresponding to the traveling speed is received.
31 is controlled. Accordingly, the auxiliary driving amount is not set to be more than the human power, and the driving force is not supplied when the vehicle is running at a certain speed or more, so that the safe running of the bicycle can be ensured.

According to a third aspect of the present invention, as shown in FIG.
The sprocket wheel 21A is held in contact with the lower side of the upper chain wound around the front wheel and the rear wheel, and is held so as to push the chain upward. By using the human-powered torque sensor 21 according to the present invention with such a sprocket wheel 21A, it becomes possible to attach the bicycle to a bicycle or the like to which the check case 9 has already been attached, and to use the existing attached chain case 9 or chain. This device does not need to be replaced with a special device, and the device can be easily attached to a bicycle or the like. The sprocket wheel 21A is fixed to the fixed part 12 via a shaft.

The electric driving force assisting device according to claim 4 is
The fixing means 11 for fixing to a manually driven vehicle body includes:
As shown in FIG. 1, it is characterized by comprising a screw mechanism composed of a bolt and a nut. Thereby, the device of the present invention can be attached to and detached from a bicycle or the like by tightening screws.
It becomes possible to carry out by a simple work by removing, and it is possible to easily adjust the interval between the tire of the rear wheel and the present device.

[0011] The electric driving force assisting device according to claim 5 is
The roller 134 for assisting driving of the rear wheel is made of metal or hard plastic, and has a surface curved inward. The surface is provided with a groove or anti-slip material at regular intervals. It is characterized by being. Thereby, the degree of pressure contact with the tire and the coefficient of friction when the roller 134 is pressed against the tire can be increased to prevent slippage between the two.

The electric driving force assisting device according to claim 6 is
The pulley 132 of the drive motor and the pulley 135 of the roller are wound around a timing belt. Thus, the rotation of the drive motor 131 can be efficiently and reliably transmitted to the roller 134. The electric driving force assisting device according to claim 7 is characterized in that the pulley 135 of the roller is constituted by a one-way clutch mechanism. As a result, the rotation of the roller 134 does not hinder the traveling and the drive motor 1
Also, there is no damage to 31.

The electric driving force assisting device according to the eighth and ninth aspects is characterized in that, as shown in FIGS. 7 to 9, an automatic transmission means 15 is provided in addition to the above configuration.
The automatic transmission means 15 is a pulley which is rotatably mounted on the roller 134 side together with a rotation shaft 34 of the roller together with a sleeve bearing 39 and the like and has friction rings 35 formed on both side surfaces. A timing pulley 135A fastened to the timing pulley 135B by the disc spring 37, and a timing pulley 135B fixed to the rotating shaft 34 of the roller.
A timing pulley 132A fixed to the rotating shaft 32 of the driving motor 131 on the drive motor 131 side;
A pulley having a smaller diameter than the timing pulley 132A and configured by a one-way clutch mechanism,
A timing pulley 132B rotatably attached to the rotation shaft 32 of the motor in only one direction, and the timing pulley 135A and the timing pulley 13B.
2A, the timing pulley 135B and the timing pulley 132B are respectively connected to the timing belt 136A,
136 </ b> B, and the speed is controlled by utilizing the friction of the friction ring 35.

The addition of the automatic transmission means 15 makes it possible to transmit the driving force of the driving motor 131 to the tire in a state where the driving force can be obtained with a high torque. That is, the auxiliary drive for the rear wheels can be efficiently performed without applying an excessive load to the drive motor 131. In addition, according to the automatic transmission means 15 having the above configuration, since the friction is used, the shock of speed switching is small,
No external mechanism such as a gear is required, and the speed switching level can be easily adjusted by the tightening amount of the disc spring 37.

An electric driving force assisting device according to a tenth aspect of the present invention is characterized in that the manually driven vehicle to which the present device is attached is a typical two-wheeled or three-wheeled bicycle.

The electric driving force assist device having such a configuration is
The fixed part 12, the drive part 13, the spring means 14, the sprocket wheel 21A and / or the automatic transmission means 15 are integrally formed as a unit housed in, for example, a waterproof hard plastic or the like. The present device can be easily attached to an existing bicycle or the like, and can be easily modified to a bicycle with an electric driving force assist device by attaching to the bicycle or the like.

[0017]

Next, an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of a main part showing a state in which the electric driving force assisting device according to the present invention is attached to a bicycle, FIG. 2 is a plan view of the main part, and FIG. FIG. 4 is a control block diagram of an embodiment using a human-powered torque sensor and a traveling speed sensor. FIG. 5 is a diagram showing an example of mounting positions of the human-powered torque sensor and the traveling speed sensor. FIG. 6 is a human-powered torque sensor. FIG. 7 is a perspective view showing an embodiment in which an automatic transmission mechanism is added to the electric driving force assist device according to the present invention, and FIG. FIG. 9 is an exploded view illustrating a configuration of a roller-side pulley according to the present embodiment.

1 and 2, reference numeral 10 denotes an electric driving force assisting device of the present invention, 11 denotes a fixture (screw mechanism) as fixing means, 12 denotes a fixing portion of the present device, 13 denotes a driving portion of the present device,
14 is a spring. As shown in the figure, the electric driving force assisting device according to the present invention is a very simple device including a fixing portion 12 having a fixing tool 11, a driving portion 13, and a spring 14. This device is mounted below the chain stay 8 between the rear wheel and the crankshaft housing frame 7 where the lower frame 4 and the rear frame 5 of the bicycle are joined.

The fixing portion 12 is a member fixed to the bicycle main body by the fixing tool 11, and the fixing means between the fixing portion 12 and the bicycle main body may be fixed by soldering or the like. In consideration of the removal work, the adjustment of the distance from the tire 2, and the like, it is convenient to adopt a screw mechanism including a bolt and a nut as the fixing tool 11. In this case, as shown in FIGS. 1 and 2, a stud 111 is fixed to the upper portion of the fixing portion 12 by welding or the like, and an insertion hole for the bolt is opened in a gap between the two chain stays 12 of the bicycle. Can be constructed and tightened with nuts from above the pedestal. Conversely, various configurations can be adopted, such as a screw hole being drilled in the upper part of the fixing portion 12 and fastening with a headed bolt from above the pedestal. Note that the number of bolts used here is not limited to one, and the number can be appropriately selected according to the type of a bicycle or the like to which the present device is applied. In addition, this fixed part 12 includes:
A sprocket wheel 21A described later is mounted via a shaft.

The drive section 13 is rotatably mounted at one end of the fixed section below the fixed section 12 so as to be rotatable within a certain range. The drive section 131 is a driving source, and a pulley 132 is mounted on a rotating shaft of the drive motor. , Rear tire 2
And a pulley 135 attached to the rotating shaft of the roller for auxiliary driving of the rear wheel by pressing against the roller. The pulley 132 transmits the rotation of the drive motor 131 to the roller 134 via the pulley 135, and the rotation of the roller 134 auxiliary-drives the rear wheel pressed against the roller.

Roller 134 for auxiliary driving of the rear wheel
Is made of metal or hard plastic, and its surface is curved inward. The surface of the roller 134 is provided with a groove or a non-slip material at regular intervals. Thus, the material of the roller 134,
By configuring the shape and the like, when the roller comes into pressure contact with the tire 2, the tire bites into the roller, increasing the degree of pressure contact with the tire and the friction coefficient to prevent slippage between the two, thereby efficiently increasing the driving force of the drive motor 131. Can be transmitted to the rear wheel.
The material, shape, and the like of the roller 134 are not limited to those described above, and various materials and shapes can be adopted as long as they increase the degree of pressure contact with the tire and increase the coefficient of friction with the tire. For example, the material may be hard rubber or the like.

The belt around which the drive motor pulley 132 and the roller pulley 135 are wound can be various belts or chains, but it is convenient to use this as a timing belt. By using a timing belt, the weight of the apparatus itself can be reduced, and the rotation of the drive motor 131 can be transmitted to the roller 135 efficiently and reliably.

The pulley 135 attached to the roller is constituted by a one-way clutch mechanism. Therefore, when the rotation speed of the rear wheel is higher than the rotation speed of the drive motor 131, only the roller rotates and the high speed rotation of the rear wheel is not transmitted to the drive motor 131.
Therefore, even if the roller 134 is in contact with the tire 2, the running of the bicycle is not hindered, and the drive motor is not damaged.

The spring 14 urges the fixing portion 12 and the driving portion 13 to be located at a predetermined interval in order to ensure that the roller 134 is in contact with the tire 2. FIG. 1 shows a helical spring in which the spring 14 is mounted on the upper surface of the fixed portion 12 and the upper surface of the drive portion 13, but the mounting position of the spring can be arbitrarily selected. May be attached as a rod-shaped or plate-shaped spring, with the rotating portion between the fixed portion 12 and the driving portion 13 as a fulcrum.

When the axis between the center point O of the rear wheel and the center point X of the roller is linear as shown in FIG. 3B, in order to press the roller against the tire 2, the tire direction as indicated by an arrow is taken. A strong pressing force is required. On the contrary,
In the present invention, by providing a fulcrum P (a rotating portion between a fixed portion and a driving portion) as shown in FIG. Center point O
And displaced from the axis. Thus, according to the present invention, as the load is applied to the rear wheel, that is, when the rear wheel rotates at a low speed, the roller 134 moves in the direction of cutting into the tire 2 (upward arrow) according to the driving force from the drive motor 131. It is displaced and pressed strongly against the tire 2. For this reason, the driving force is effectively transmitted without the roller slipping on the tire. On the other hand, when the vehicle runs free without receiving the auxiliary drive by the drive motor, that is, when the rear wheels rotate at high speed,
The roller is displaced in the direction of escaping from the tire 2 (downward arrow) in opposition to the urging of the rear wheel, so that the load of rotation of the rear wheel hardly occurs. That is, even if the rollers are in contact with the tires, they do not hinder the running of the bicycle.

The electric driving force assisting device according to the present invention is provided with a human torque sensor 21 and a traveling speed sensor 22. Based on these outputs, start and stop of the driving motor 131 and auxiliary driving by the driving motor 131. A control device for controlling the quantity is provided.

The human torque sensor 21 detects the pedaling force of a human pedal. Such a human torque sensor 2
The first configuration can be a sensor or the like in which, for example, conductive rubber is interposed between electrodes. In the present invention,
As shown in FIG. 6 (A), this human-powered torque sensor is brought into contact with the lower side of an upper chain wound around a front wheel and a rear wheel of a bicycle or the like, and pushes the chain upward. It may be based on the held sprocket wheel 21A. The sprocket wheel 21A is fixed to an appropriate portion such as an upper surface or a side surface of the fixing portion 12 via a shaft.

Such a sprocket wheel is mounted so as to mesh with a rotating chain, and when the sprocket wheel is mounted on the chain, it is necessary to guarantee smooth rotation of the chain. There are limits to size. Therefore, as shown in FIG. 6 (B), in the conventional method in which the sprocket wheel is mounted on the upper side of the bicycle chain with the chain case 9 attached thereto, when tension acts on the chain, the sprocket wheel moves upward as shown by the arrow. The sprocket wheel is displaced so that the chain case 9
It is necessary to secure a space that does not contact with Therefore, it is necessary to separately prepare a special chain long enough to bend the chain.

Similarly, in a system in which a sprocket wheel is attached to a chain of an already installed length as shown in FIG. 6 (C), when a tension is applied to the chain, the sprocket wheel is indicated by an arrow. As described above, the sprocket wheel is displaced upward, and the sprocket wheel contacts the chain case 9 to hinder the rotation of the chain. Therefore, it is necessary to prepare a special chain case that has been modified, such as by cutting off a portion that comes into contact with the sprocket wheel.

As described above, the conventional sprocket wheel mounting method requires extra time and effort to replace an already mounted chain or chain case with a special one.
Expense was required.

On the other hand, according to the sprocket wheel 21A according to the present invention shown in FIG. 6A, when tension is applied to the chain, the sprocket wheel contacts the chain with the contact point of the sprocket wheel as a fulcrum. As a result of left and right tension, the sprocket wheel is displaced downward as indicated by the arrow. Therefore, it is not necessary to secure a special space between the sprocket wheel and the chain case. Therefore, even if the bicycle is equipped with a chain case, it is not necessary to replace the chain as well as the chain case, and the bicycle can be easily attached to an existing bicycle or the like.

In the present invention, as described above, when the tension acts on the chain, the sprocket wheel is displaced in the downward direction. It is intended to detect human-powered torque. That is, by configuring the sprocket wheel 21A as described above, the sprocket wheel 21A is employed as a human-powered torque sensor.

The human torque sensor 2 according to the present invention
1, as well as the sprocket wheel 21A,
For example, as shown in FIG. 5, a change in flexure or rise attached to a crank (21B), a crankshaft (21C), the upper side (21D) of a chain, or the like is detected as a change in the electric resistance of the conductive rubber, and the pedaling force of the pedal is detected. Can be detected.
Note that the sensor used here is not limited to the conductive rubber type, and changes in external force are electrically detected, for example, by using the change in resonance frequency with respect to the external force of a ceramic vibrator, or by using the change in electric resistance with respect to an external force like a strain gauge. Any one that can be derived as a change in output can be adopted.

By controlling the drive state of the drive motor 131 in consideration of the signal representing the human-powered torque detected in this manner, the output amount of the drive motor is controlled so that the auxiliary drive power does not exceed the human power. In addition, the output of the drive motor can be increased when the load of human power (pedal force of the pedal) is large, and the output can be reduced when the load is small. Therefore, excellent and appropriate operation corresponding to ride comfort, driving efficiency, and safe driving can be performed.

The running speed sensor 22 detects a signal indicating the running speed of the bicycle appropriately. The traveling speed sensor 22 emits ultrasonic waves toward the ground using an ultrasonic sensor or a photoelectric sensor, for example, as shown in FIG.
One that detects the vehicle speed from the Doppler effect of the received reflected wave (22B), one that detects the vehicle speed from the number of wheel revolutions using a generator or a pulse generator incorporated in the front wheel (or rear wheel) hub (22C), Detecting the vehicle speed by photoelectrically or magnetically counting the number of spokes (22D),
The traveling speed can be detected by, for example, a device (22E) that determines the wheel rotation speed from the moving speed of the mark attached to the rim of the wheel and detects the vehicle speed. The traveling speed can also be detected by detecting the rotation of the sprocket wheel 21A as a sensor for detecting a human-powered torque attached in contact with the above-mentioned chain with a magnetic sensor or the like. Based on the detection result of this sensor, it is possible to replenish the drive amount by the fine drive motor corresponding to the traveling speed.

FIG. 4 is a control block diagram of an embodiment using these sensors 21 and 22. This control circuit includes a comparison unit 23, a storage unit 24, a calculation unit 25, and a drive control unit 26. The comparison unit 23 includes the human-powered torque sensor 2
1. The output of the traveling speed sensor 22 is compared, and a corresponding output is generated in consideration of the output of the motor rotation sensor 28.

The storage unit 24 stores data necessary for optimally driving the drive motor in accordance with the driving situation of the bicycle or the like. Control conditions suitable for the usage environment,
For example, data suitable for acceleration on uphills, downhills, flat roads, deceleration due to braking, and the like are stored. Such storage data and a signal obtained from the output of the comparison unit 23 are calculated in the calculation unit 25, and the drive control unit 26 starts and stops the drive motor 131 and assists the drive motor 131 based on the calculation result. This is for controlling the driving amount. Therefore, the rider does not feel uncomfortable and the bicycle can run safely.

FIGS. 7 to 9 illustrate an embodiment in which an automatic transmission mechanism 15 utilizing friction is added to the electric driving force assisting device according to the present invention. As shown in the drawing, in the present embodiment, two timing pulleys 135A and 135B are provided on the roller 134 side, and two timing pulleys 132A and 132B are provided on the drive motor 131 side, and the timing pulleys 135A and 132A are provided. The timing pulleys 135B and 132B are wound around timing belts 136A and 136B, respectively.

As shown in FIGS. 8 and 9, the timing pulley 135A on the roller 134 is provided with a sleeve bearing 39 on the rotating shaft 34 side of the roller, and is rotatably mounted on the rotating shaft 34 of the roller. I have. Further, friction rings 35 are formed on both side surfaces of the pulley 135A. The friction ring 35 is configured to rub against one side surface of the timing pulley 135B and the flange 36 under certain conditions. The pulley 135A is fastened to the timing pulley 135B with a bolt 38 by a disc spring 37 via a flange 36. This flange 36 is a pulley 135A
And a friction surface with the friction ring 35 is formed, and the displacement of the timing belt 136A is prevented. On the other hand, one timing pulley 135B is fixed to the rotating shaft 34 of the roller, and always rotates together with the roller.

The timing pulley 132A on the drive motor 131 side is fixed to the rotating shaft 32 of the motor and rotates together with the motor. One of the timing pulleys 132B has a smaller diameter than the pulley 132A, is constituted by a one-way clutch mechanism, and is attached to the rotating shaft 32 of the motor so as to be rotatable in only one direction.

In this embodiment, a case has been described where two timing pulleys are provided on each of the roller side and the drive motor side. However, the number of pulleys provided is not limited to this. A configuration in which three or more timing pulleys having the above configuration are combined may be employed. By combining a large number of pulleys in this way, finer shift control can be performed.

The operation of the automatic transmission mechanism 15 having such a configuration will be described. Here, for convenience of explanation, pulley 135
A, 135B, and 132A have the same rotation speed, and the rotation speed of the pulley 132B is １ ／ of the rotation speed of the pulley 135B.
It will be described as. Now, assuming that the frictional force of the friction ring 35 is sufficiently large with respect to the load rotational force of the roller 134, if the rotational speed of the roller 134 is 2,000 rpm, the rotational speeds of the pulleys 135B, 135A, 132A are the same. . At this time, the rotation number of the pulley 132B is 2000 rpm relative to the rotation shaft 32 of the motor.
m, but 4000 rpm.

On the other hand, the load on the roller 134 increases, and the rotation speed of the pulley 135B decreases to 1000 rpm.
If the frictional force of the friction ring 35 is exceeded, the pulley 135A slips with respect to 135B. Here, the pulley 132A on the motor side is set at 2000 rpm.
m, the pulley 135A slips and the rotation speed of the roller becomes 1000 rpm. In this case, the relative speed of the pulley 132B with respect to the rotary shaft 32 of the motor is 0, and the rotational power of the motor is
To the pulley 135B. Therefore, the motor 131 maintains the efficient high rotation while pulley 1
35B will be given low speed rotation.

According to the automatic transmission means 15 having the above structure,
Since friction is used, there is little shock at the time of speed switching, no external mechanism such as a gear is required, and the speed switching level can be easily adjusted by adjusting the amount of tightening of the disc spring 37. Therefore, the device is not complicated and the riding comfort of the bicycle is not impaired.

By adding such an automatic transmission means 15 to the electric driving force assisting device according to the present invention, the driving force of the driving motor 131 can be transmitted to the tire in a state where the driving force can be obtained with a high torque. That is, the drive motor 1
The auxiliary driving force can be efficiently transmitted to the rear wheels without applying an excessive load to the motor 31, and power consumption can be reduced.

Next, the operation of the electric driving force assisting device according to the present invention having the above configuration will be described. By starting running of the bicycle, that is, by applying pedaling force to the pedal and rotating the crank, the drive motor 131 is started, the roller 134 is displaced in a direction to bite into the tire 2, and the roller is strongly pressed against the tire. In this case, when the automatic transmission means 15 is operated, the rotational power of the motor is transmitted from the pulley 132B to the pulley 135B, and the motor is driven without consuming a large amount of electric power even when a high torque is required at a low speed. Can be done.

Thereafter, for example, the driving force is supplied by the driving motor within a range not exceeding the human power until the running speed of the bicycle is less than 15 km / h. When such a bicycle starts running, or when the bicycle is just starting to run, or when a large load is applied to human power on a slope or the like, a relatively large driving power is supplied by the drive motor to assist the human-powered treading power. Function, and can make a bicycle run easily.

When the running speed of the bicycle becomes 15 km / h or more, the replenishment of the driving force by the drive motor gradually decreases, and when the running speed becomes 24 km / h, the replenishment of the driving force by the drive motor becomes zero. In this case, the driving energy can be effectively used, and the driving of the driving motor does not accelerate to a dangerous speed, so that the safe running of the bicycle is ensured. In addition, when the driver does not seek a speed higher than the current speed during traveling, if the driver stops pressing the pedal, the rotation of the drive motor stops.

In the above-described example of the use of the electric driving force assisting device, an example has been described in which the vehicle is mounted on a two-wheeled bicycle as a manually driven vehicle. However, a manually driven vehicle is a vehicle that moves by human power. However, the present invention is not limited to the above-described two-wheeled bicycle, but may be a three-wheeled bicycle or, for example, a wheelchair. The same effect can be obtained by attaching the electric driving force assist device to the wheelchair.

The electric driving force assisting device according to the present invention accommodates the entire device in a casing or a cover in order to prevent mud, dust, water and the like from entering the device and to ensure safety. I do. The power for driving the apparatus is supplied by a battery, and the battery can be attached and fixed to an arbitrary place such as the chain stay 8, the lower frame 4, and the rear frame 5 of the bicycle.

[0051]

As described in detail above, the electric driving force assisting device according to the present invention has a simple structure and a low manufacturing cost.
It is easy to attach to a bicycle or the like, and it is possible to efficiently supply an auxiliary driving force to a manual driving as needed and reduce the human power.

Further, according to the present invention, a human power, a running speed, and the like applied from the outside are detected by a sensor, and the auxiliary drive amount can be controlled in consideration of the detection result. Auxiliary driving without discomfort becomes possible, and safe driving such as a bicycle can be ensured.

Further, according to the electric driving force assisting device according to the present invention to which the automatic transmission mechanism is added, the device is not complicated and the shock at the time of speed switching is small, so that the riding comfort of the bicycle is not impaired. . Further, the auxiliary drive can be efficiently performed without applying an excessive load to the drive motor, and power consumption can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of main components showing a state where an electric driving force assisting device according to the present invention is mounted on a bicycle.

FIG. 2 is a plan view of main components showing a state where the electric driving force assisting device according to the present invention is attached to a bicycle.

FIG. 3 is a diagram illustrating a displacement of the electric driving force assisting device according to the present invention.

FIG. 4 is a control block diagram of an embodiment using a human-powered torque sensor and a traveling speed sensor in the electric driving force assisting device according to the present invention.

FIG. 5 is a diagram illustrating an example of mounting positions of a human-powered torque sensor and a traveling speed sensor.

FIG. 6 is a diagram illustrating a configuration in which a human-powered torque sensor is formed by a sprocket wheel.

FIG. 7 is a perspective view showing an embodiment in which an automatic transmission mechanism is added to the electric driving force assist device according to the present invention.

FIG. 8 is a cross-sectional view showing a configuration of an embodiment in which an automatic transmission mechanism is added to the electric driving force assist device according to the present invention.

FIG. 9 is an exploded view illustrating a configuration of a roller-side pulley according to an embodiment in which an automatic transmission mechanism is added to the electric driving force assist device according to the present invention.

[Explanation of symbols]

2 Tire 3 Tire Cover 4 Lower Frame 5 Rear Frame 6 Crank 7 Crankshaft Housing Frame 8 Chain Stay 9 Chain Case 10 Electric Driving Force Auxiliary Device 11 Fixing Tool, Screw Mechanism (Fixing Means) 12 Fixed Part 13 Drive Part 14 Spring (Spring) Means) 21, 21A, 21B, 21C Human-powered torque sensor 22, 22A, 22B, 22C, 22D Running speed sensor 23 Comparison unit (comparison unit) 24 Storage unit (storage unit) 25 Operation unit (operation unit) 26 Drive control unit ( Drive control means) 28 Motor current sensor 32 Rotary shaft of drive motor 34 Rotary shaft of roller 35 Friction ring 36 Flange 37 Disc spring 38 Bolt 39 Sleeve bearing 111 Pedestal 131 Drive motor 132 Pulley of drive motor 134 Roller 135 Roller pulley 135A , 135B, 132A, 132B Timing pulley 136 belt, chain (timing belt) 136A, 136B Timing belt

Claims (10)

[Claims] 1. An electric driving force assisting device mounted on a human-powered vehicle such as a bicycle and assisting manual driving by a tire contact driving method, a fixing portion having fixing means (11) for fixing to a human-powered vehicle main body. (12) and a drive motor (13) rotatably attached to the fixed portion (12).
1) and a roller (134) for auxiliary driving of the rear wheel by pressing against the tire (2) and transmitting the rotation of the driving motor (131) to the roller (134). 132) and a roller pulley (135) wound around a belt or a chain (136), and a driving unit (13), and the roller (134) is in contact with the tire (2) in order to ensure a state of contact with the tire (2). Fixed part (1
2) An electric driving force assisting device comprising: a spring means (14) for urging the drive unit (13) to be positioned at a predetermined interval. 2. A human-power torque sensor (21) for detecting a human-powered torque, a traveling-speed sensor (22) for detecting a traveling speed, and a comparison means for comparing a signal output obtained from these with a motor rotation. (23), a storage means (24) for storing a control condition suitable for a ratio of an auxiliary driving force to a human power and a use environment, and an output of the comparison means (23) and an output of the storage means (24) are calculated. A driving motor (13) based on the output of the drive control means (26), and a drive control means (26) for controlling the drive by the output of the calculation means (25).
2. The method according to claim 1, further comprising the steps of: starting and stopping in 1) and controlling an auxiliary driving amount by a driving motor.
3. The electric driving force assisting device according to claim 1. 3. A sprocket wheel in which the human-powered torque sensor (21) is in contact with the lower side of an upper chain wound around a front wheel and a rear wheel, and is held so as to push the chain upward. The electric driving force assisting device according to claim 2, wherein (21A) is used. 4. The electric motor according to claim 1, wherein said fixing means for fixing to a manually driven vehicle body is constituted by a screw mechanism comprising a bolt and a nut. Driving force assist device. 5. A roller (13) for assisting driving of the rear wheel.
4) is made of metal or hard plastic, the surface of which is curved inward, and the surface is provided with a groove or anti-slip material at regular intervals. Item 5. The electric driving force assisting device according to any one of Items 1 to 4. 6. The electric driving force assisting device according to claim 1, wherein a pulley (132) of the driving motor and a pulley (135) of a roller are wound around a timing belt. . 7. The roller pulley (135)
The electric driving force assisting device according to any one of claims 1 to 6, wherein the electric driving force assisting device is configured by a one-way clutch mechanism. 8. An electric driving force assisting device according to claim 1, further comprising an automatic transmission means (15). 9. The automatic transmission means (15) is a pulley having a friction ring (35) formed on both sides thereof so as to be rotatably mounted on a rotation shaft (34) of the roller (134) on the roller (134) side. And the timing pulley (135A) fastened to the timing pulley (135B) by the disc spring (37) via the flange (36).
And a timing pulley (135B) fixed to a rotation shaft (34) of the roller, and a timing pulley (132A) fixed to the rotation shaft (32) of the motor on the drive motor (131) side. A timing pulley (132B) having a diameter smaller than that of the timing pulley (132A) and constituted by a one-way clutch mechanism, the timing pulley (132B) being rotatably attached to the rotation shaft (32) of the motor only in one direction. The timing pulley (135A) and the timing pulley (132A), and the timing pulley (135B) and the timing pulley (132B) are wound by timing belts (136A and 136B), respectively, and are driven by a friction ring (35). The shift control is performed using friction. Electric driving force assisting device according to. 10. The electric driving force assisting device according to claim 1, wherein the manually driven vehicle is a bicycle.