JPH11334675A - Bicycle with electric motor - Google Patents

Abstract

(57) [Summary] (with correction) [PROBLEMS] To provide a bicycle with an electric motor that protects the electric motor, reduces the center of gravity, and reduces the size of the system. SOLUTION: An electric motor 22 extends rearward and downward from a head pipe 2 and extends upward at an upper portion of a pedal crankshaft.
A bicycle with an electric motor includes frame members 3 and 5 holding the seat 12 at its upper end, and includes a battery 23 and a controller 24 in the internal space of the frame member 3 and controls power supply from the battery to the electric motor by the controller. Crankshaft case 14 that supports pedal crankshaft 15
Is attached to the lower part of the frame members 3 and 5, and an electric motor is provided integrally with the crankshaft case behind the pedal crankshaft so that the motor drive shaft is directed substantially in the horizontal direction. Means and a vehicle speed detecting means, and the controller controls the output of the electric motor 22 in accordance with the output of the pedaling force detecting means and the vehicle speed detecting means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bicycle with an electric motor having an electric motor for assisting human power.

[0002]

2. Description of the Related Art Various types of bicycles with an electric motor have been proposed in the prior art. For example, the bicycle disclosed in Japanese Patent Application Laid-Open No. 4-358895 has a motor drive shaft protruding substantially downward below a seat tube of the bicycle. An electric motor is accommodated, and the rotation of the motor drive shaft is transmitted to the crankshaft via a one-way clutch. The motor current that changes in accordance with the amount of manual operation of the accelerator lever attached to the handlebar is supplied to the electric motor.

[0003]

The electric motor is arranged above the crankshaft because the motor drive shaft projects substantially downward to transmit power to the crankshaft via a one-way clutch. Therefore, there is a possibility that a stepping stone or water is directly received from the front.

An electric motor, which is a heavy object, is located above the crankshaft and raises the center of gravity of the vehicle body, and no consideration is given to lowering the center of gravity. In addition, the electric motor portion of the seat tube is greatly bulged, and the bicycle frame is complicated, and no consideration is given to the simple appearance of the bicycle and the compactness of the system. Further, the vehicle speed detecting means is provided on the motor or the front wheels, and the motor is dedicated, so that the cost is increased and the system is prevented from being compact and unitized.

The present invention has been made in view of the above points, and an object thereof is to provide an electric motor that protects the electric motor and has a low center of gravity, a simple appearance, a compact system, and high reliability. The point is to offer a bicycle.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to an electric motor which transmits a motor driving force to a drive transmitting means for transmitting a driving force of a pedal manual driving means to driving wheels and assists human power. A motor and a frame member extending rearward and downward from the head pipe, extending upward at an upper portion of the pedal crankshaft, and holding a seat at an upper end thereof, wherein a battery and a controller are included in an internal space of the frame member, In a bicycle with an electric motor that controls power supply from a battery to an electric motor, a crankshaft case that supports a pedal crankshaft is attached to a lower portion of the frame member, and is electrically integrated with the crankshaft case behind the pedal crankshaft. A motor is provided so as to direct the motor drive shaft in a substantially horizontal direction, and a pedal crank is provided on the crankshaft case. A bicycle with an electric motor provided with a pedaling force detecting means for detecting a pedaling force applied to the vehicle and a vehicle speed detecting means for detecting a vehicle speed, wherein the controller controls the output of the electric motor by the controller according to the outputs of the pedaling force detecting means and the vehicle speed detecting means And

[0007] Since the electric motor is provided integrally with the crankshaft case behind the pedal crankshaft so that the motor drive shaft is directed substantially in the horizontal direction, the crankshaft case positioned on the front side with respect to stepping stones and water from the front. Can protect the electric motor. Further, since the heavy electric motor is provided at the same height as the pedal crankshaft, the center of gravity of the vehicle body can be reduced, and the lightness of the bicycle is not impaired.

Since the crankshaft case is provided with a pedaling force detecting means for detecting the pedaling force applied to the pedal crankshaft and a vehicle speed detecting means for detecting the vehicle speed, the system can be unitized and the system can be made compact to improve the reliability of the system and to improve the reliability of the bicycle. In addition to the simple appearance, the motor can be a general-purpose motor, and the assist characteristics can be easily selected according to the characteristics of the bicycle.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention shown in FIGS. 1 to 9 will be described below. FIG. 1 is a side view of a motorcycle 1 using the driving force assist device of the present embodiment.

[0010] The body frame is moved from the head pipe 2 to the rear wheel.
The main frame 3 extends substantially linearly obliquely downward over the ten pivot portions, and a seat post 5 stands up from the middle of the main frame 3.

A front wheel 9 is rotatably supported at the lower end of a front fork 8 rotatably supported by the head pipe 2, and a rear wheel 10 is rotatably supported by an axle case 21 mounted on a rear end of the main frame 3 by mounting bolts 25. Have been. An upper portion of the front fork 8 is connected to a handle 11, and a seat 12 is provided at an upper end of the seat post 5.

A crankshaft case 14 is suspended from a connection portion of the main frame 3 with the seat post 5 via a bracket 13, and pedal arms 16 are provided at both ends of a crankshaft 15 projecting right and left from the crankshaft case 14. The pedal is mounted at a right angle with its ends fitted, and a pedal 17 is protruded from the tip of a pedal arm 16 in the left-right direction to constitute a pedal crank as a whole.

A gear case 18 behind the crankshaft case 14
The drive shaft 19 further extends rearward through the cylindrical cover 20 and fits in the axle case 21 of the rear wheel 10. A motor 22 is provided between the pedal cranks along the gear case 18. A cavity is formed inside the main frame 3, and a battery 23 and a control unit 24 are built in the cavity.

A human-powered drive system by the pedal 17 and a motor 22
The configuration of the motor drive system will be described with reference to FIGS. A center boss 35 is rotatably fitted to the crankshaft 15 via a pole ratchet type one-way clutch 30 at the left and right center positions on the crankshaft 15 rotatably supported on the crankshaft case 14 via bearings 15a. Have been combined.

The center boss 35 has a large-diameter disk portion 35b at the left end of a fitting cylindrical portion 35a rotatably fitted to the crankshaft 15, and a ratchet cylindrical portion 35c on the left side of the large-diameter disk portion 35b.
, Right side, 35d recesses for storing 5 springs at equal intervals
Are formed.

A ratchet tooth 35e is formed on the inner peripheral surface of the ratchet cylindrical portion 35c. Further, an urging means 32 for urging the ratchet pole 31 is interposed.

In FIG. 4, when the crankshaft 15 is rotated counterclockwise (the rotation of the pedal 17 in the forward direction), the ratchet pawl 31 engages with the ratchet teeth 35e and the center boss 35
However, in the clockwise direction of the crankshaft 15, the ratchet pawl 31 is displaced inward against the urging means 32 to get over and engage with the ratchet teeth 35e, thereby preventing the crankshaft 15 from engaging. Idles and the driving force is not transmitted to the center boss 35. The one-way clutch 30 as described above is configured.

On the other hand, a drive bevel gear 36 is rotatably fitted on the outer periphery of the fitting cylindrical portion 35a of the center boss 35 with respect to the center boss 35. The drive bevel gear 36 has a disc portion formed with five recesses of the center boss 35.
Five recesses 36b for accommodating springs are formed corresponding to 35d.

As shown in FIG.
d and the recess 36b of the drive bevel gear 36
Two cylindrical spaces are formed, and springs 37 are respectively interposed in the formed five spaces.

Therefore, the rotation of the center boss 35 is transmitted to the drive bevel gear 36 via the spring 37, and the spring 37 is elastically reduced in accordance with the load state of the center boss 35 and the drive bevel gear 36, so that the two rotate relatively. Dynamically displaces.

A plurality of ridges 35f are formed on the outer peripheral surface of the ratchet cylindrical portion 35c of the center boss 35 so as to be directed in the axial direction, and a sensor ring as a cylindrical movable piece is formed on the outer periphery of the ratchet cylindrical portion 35c. 38 is fitted to the groove on the inner periphery thereof so as to be slidable in the axial direction by engaging the protrusion 35f on the center boss 35 side.

Therefore, the sensor ring 38 rotates integrally with the center boss 35 and can be displaced in the axial direction.

On the other hand, five protruding pieces 36c project in the left axial direction from a predetermined radial position of the disk portion of the drive bevel gear 36, and the sensor ring 38 is provided inside the five protruding pieces 36c.
Are coaxially close.

As shown in FIG. 6, a groove cam 36d is formed obliquely in the shape of a long hole in the protruding piece 36c, and a pin 39 protruding outward from the sensor ring 38 is provided with the pin cam 36d.
It is movably fitted to d.

Therefore, when there is a relative rotational displacement between the center boss 35 and the drive bevel gear 36, the pin 39 rotates integrally with the center boss 35 and is guided by the groove cam 36d to move in the axial direction to move the sensor ring 38. Is displaced in the axial direction.

FIGS. 2 and 6 show the case where there is no load on the pedal side by a solid line. The sensor ring 38 and the pin 39 are located at the rightmost end. Center Boss 35 through 30
6 compresses the spring 37 and precedes the drive bevel gear 36, the pin 39 precedes (relatively displaces to the left) the protruding piece 36c in FIG.
, That is, to the left in the axial direction as shown by the phantom line in FIG. 6, and to protrude the sensor ring 38 to the left as shown by the phantom line in FIG.

As the load on the pedal side increases, the center boss 35 increases.
Tends to precede the drive bevel gear 36 more, so that the sensor ring 38 is increasingly displaced to the left.

In the sensor ring 38, a plurality of projections 38b each having a mountain-shaped distal end projecting leftward from the fitting portion 38a of the center boss 35 with the ratchet cylindrical portion 35c are annularly projected. As shown in FIG. 7, the plurality of protrusions 38b have a predetermined interval from each other and have a triangular tip.

The sensor ring 38 has a projection 38
b The compression spring is thicker inward than between this step and the disc-shaped presser fitting 40 fitted integrally to the crankshaft 15.
41 are interposed. The compression spring 41 always urges the sensor ring 38 to the right to eliminate hysteresis due to the clearance between the pin 39 integrated with the sensor ring 38 and the groove cam 36d.

A Hall sensor 42 having a detection point 42a located at a predetermined axial position where the projection 38b of the sensor ring 38 is displaced is fixed to the front of the crankshaft case 14.

The detection point 42a is located slightly to the left of the tip of the projection 38b when the sensor ring 38 is located at the right end.
As the sensor ring 38 is displaced to the left, the protrusion 38b
Will be relatively shifted toward the skirt. Therefore, the rate at which the hall sensor 42 detects the protrusion 38b of the sensor ring 38 that rotates is increased as the load on the pedal side is increased and the sensor ring 38 is displaced to the left.

FIG. 8 shows a voltage signal waveform detected and output by the Hall sensor 42. As shown in FIG. 7, the detection point 42a of the Hall sensor 42 with respect to the projection 38b of the sensor ring 38
FIG. 8 shows the output waveform of the Hall sensor 42 when the relative position of the position is detected at each of the positions a, b, c, and d.

At the position a, since the Hall sensor 42 has not detected the projection 38b at all, there is no high-level portion indicating the detection, the ratio is 0%, and at the position b where the sensor ring 38 is displaced somewhat, the position of the projection 38b is not detected. When the tip is detected, the ratio of the high-level portion is about 10%. Further, at the position c where the sensor ring 38 is displaced, the ratio is about 45%.
Where the detection point 42a of the Hall sensor 42 is located at the bottom of
If it is a position, the percentage of high-level parts is 90%.

This output signal is used as it is as a duty signal for controlling the motor 22.

Next, the drive transmission means downstream of the drive bevel gear 36 will be described. Drive bevel gear 36 has driven bevel gear 45 that meshes at right angles with bearing 44.
And is fitted to the front end of the drive shaft 19.

As shown in FIG. 3, the drive shaft 19 passes through the cylindrical cover 20 and fits into the axle case 21. A bevel gear 46 is fitted at an end of the drive shaft 19, and the bevel gear 46 has a bearing 47.
It is rotatably supported by.

A rotating cylindrical shaft 49 rotatably supported by bearings 48 in the axle case 21 is internally penetrated by a pivot 50 and is supported via a needle bearing 51, and a bevel gear fitted to the rotating cylindrical shaft 49. 52 meshes with the bevel gear 46 fitted on the drive shaft 19.

A bearing 48 for supporting a rotary cylindrical shaft 49 is fitted on the right outside of the bevel gear 52, and the outside thereof is covered by a cover member.
A nut 54 is screwed onto the right end thread portion of the pivot 50 projecting outward from the lid member 53 to prevent the bearing 48 from coming off. The wheel hub 55 of the rear wheel 10 is fitted into a spline groove in the left half of the rotating cylindrical shaft 49 and is fixed by a nut 56. The rear wheel 10 is supported on the wheel hub 55 via spokes 57.

The rear portion of the main frame 3 is divided into left and right frames 3a and 3b, and the right frame 3b is mounted on the axle case 21 with mounting bolts 25.
The rear end 3c of the frame 3a includes a fork-shaped rear end 3c, a left end of the pivot 50, and a flange 50a formed on the pivot 50 and a nut 58 fitted to the left end thread of the pivot 50.
Is pinched.

The above is the manual drive system, in which the driver operates the pedal.
When the crankshaft 15 is rotationally driven by stepping on 17, the drive shaft 19 is rotated via the one-way clutch 30, the spring 37, and the bevel gears 36 and 45, and the rotating cylindrical shaft 49 is rotated with the rear wheel 10 via the bevel gears 46 and 52. It can be run as a bicycle.

At this time, when the load is large, such as when climbing a sloping road or at the start of running, the output waveform of the Hall sensor 42 has a high level portion at an increased rate. When the pedal is not depressed during running, the rotation of the rear wheel 10 is
Bevel gear 45 and center boss 35 forward through 19
, But is not transmitted to the crankshaft 15 and the pedal 17 by the one-way clutch 30, and the vehicle can travel with the same feeling as during normal bicycle running.

On the other hand, the hall sensor 42 is a center boss 35
This means that the rotation of the rear wheel 10 (that is, the rotation of the rear wheel 10) is detected, and the cycle in which the high level portion of the output waveform appears corresponds to the vehicle speed. Element is included.

Next, a drive system by a motor 22 provided between the left and right pedal cranks behind the crankshaft 15 will be described. The gear case 18 protrudes leftward from a portion that houses the upstream side of the drive shaft 19, and a motor 22 is fitted into the front opening of the protruding portion from the front.

Accordingly, the driving force assisting mechanism is unitized together with the pedal depression force detecting mechanism. The motor 22 is located in the vicinity of the crankshaft 15, and its drive shaft projects rearward and is directed in a direction orthogonal to the crankshaft 15, so that the motor 22 itself fits compactly within the left and right widths of the crankshaft 15. ing.

The motor shaft 22 can be protected by the crankshaft case 14 located on the front side against a flying stone or water from the front. Further, since the heavy motor 22 is disposed at the same height as the crankshaft 15, the center of gravity of the vehicle body can be reduced, and the lightness of the bicycle is not impaired.

The pedaling force detecting means for detecting the pedaling force applied to the crankshaft 15 in the crankshaft case 14 and the pedaling force detecting means can easily detect the vehicle speed at the same time, and are unitized to improve the reliability of the system by making the system compact. And keep the simple appearance of a bicycle.

A gear 60 is formed at the end of the drive shaft projecting rearward from the motor 22, and the gear 61 meshes with the gear 60.
A gear 62a is formed on a rotating shaft 62 that integrally supports the gear 61.A gear 63 meshes with the gear 62a, and a gear 64a is formed on a rotating shaft 64 integrated with the gear 63, thereby forming a reduction gear group. I have.

On the other hand, the gear 65 fitted to the drive shaft 19 via the one-way clutch 66 is
It is in mesh with 64a.

Therefore, when the motor 22 is driven, it is reduced by the meshing of the reduction gear group to rotate the gear 65, and further transmitted to the drive shaft 19 via the one-way clutch 66 to assist the rotational drive of the rear wheel 10 by human power. can do.

The one-way clutch 66 allows the rear wheel 10
Is not transmitted to the gear 65, and the reduction gear group and the motor 22 do not become resistance during traveling or the like due to inertia.

The above-described human assist control by the motor 22 is performed based on the output signal of the hall sensor 42.
This motor drive circuit is shown in FIG.

The output of the Hall sensor 42 is input to the base terminal of a power transistor 71 whose emitter is grounded via an amplifier 70. The collector terminal of the power transistor 71 is connected to one terminal of the motor 22, and the other terminal is connected to the battery.
Connected to 23.

The output waveform of the Hall sensor 42 is as shown in FIG. 8. Since the power transistor 71 conducts at a high level, the output signal of the Hall sensor 42 directly controls the duty of the motor 22. Therefore, it is not necessary to separately provide an electrical chopping control circuit and the like.

The duty control of the motor 22 is such that as the load on the pedal side increases, the ratio of the high level portion of the Hall sensor 42 increases (the duty ratio increases).
The power supply time to the motor 22 is increased, the driving force of the motor 22 is increased, the assistance by the motor 22 is increased, and the burden on the driver is reduced.

In this embodiment, the motor 22 is provided at a position where the driving force of the motor 22 is transmitted to the drive shaft 19 downstream of the driving transmission position by the spring 37, so that self-feedback is possible. That is, when the motor output exceeds the human treading force, the motor 22 acts in a direction to return the relative displacement between the center boss 35 and the drive bevel gear 36, and as a result, the motor output is reduced.

On the other hand, the motor 22 is a control unit
The vehicle speed is also measured by an output signal of the hall sensor 42 (not shown), and the motor 22 is controlled based on the vehicle speed. For example, when the vehicle speed is lower than a certain value and at a higher speed than a certain value, the motor 22 is stopped so that a heavy load is imposed on the motor 22 and unnecessary operation is avoided.

In the present embodiment, the vehicle speed detection used for such control can be simultaneously detected by a mechanism such as the sensor ring 38 and the hall sensor 42, so that there is no need to provide a separate vehicle speed detection device, the number of parts is reduced, and assembly is performed. The work can be simplified, the weight of the vehicle body can be reduced, and the cost can be reduced.

The protrusion 38b of the sensor ring 38 of the present embodiment.
The tip has a triangular shape, and the proportion of the peak changes linearly toward the tip, and the sensor ring 38
Since the groove cam 36d for guiding the movement of the pedal is a linear elongated hole, the output of the Hall sensor 42 with respect to the pedaling force changes linearly as shown by the solid line A in FIG.

Here, as shown in FIG. 11A, assuming that the tip of the projection of the sensor ring 138 has a shape Ia in which two sides of the triangular shape are bulged outward, the output characteristics of the Hall sensor 42 are as shown in FIG. As shown by an alternate long and short dash line I in FIG. 10, an upwardly convex curve is shown, so that the assisting force of the motor 22 can be increased while the pedal effort is small.

Conversely, as shown in FIG. 11 (2), when the tip of the projection of the sensor ring 238 has a shape IIa in which two sides of a triangle are depressed inward, the output characteristics of the Hall sensor 42 are as shown in FIG. Shows a downwardly convex curve as shown by a two-dot chain line II,
The greater the pedal effort, the greater the assisting force of the motor 22 can be applied.

By changing the shape of the tip of the projection of the center ring in this manner, the output characteristics of the Hall sensor 42 can be changed, and the manner in which the assisting force of the motor 22 works can be easily changed.

The output characteristics of the Hall sensor 42 can also be changed by changing the shape of the groove cam 36d provided on the projecting piece 36c of the drive bevel gear 36.

That is, in this embodiment, since the groove cam 36d is formed in an oblique linear shape as shown in FIG.
Although the output characteristic of the Hall sensor 42 is also a straight line as shown by a solid line in FIG. 12, the groove cam 136 has the same inclination direction and a downwardly convex curved shape 136d as shown in FIG. Then, the displacement of the sensor ring 38 is increased while the pedaling force is small, and the characteristic of the upwardly convex curve shown by the dashed line I in FIG. 10 is shown. Conversely, as shown in FIG. With the convex curved shape 236d, the displacement of the sensor ring 38 is increased as the treading force is increased, so that the characteristic of the downwardly convex curve shown by the two-dot chain line II in FIG. 10 can be obtained.

By changing the shape of the groove cam in this manner, the manner of operation of the assisting force of the motor 22 can be easily changed.

Although the above-described embodiment is a two-wheeled vehicle driven by a shaft driven by a drive shaft 19, the present invention is also applicable to a two-wheeled vehicle driven by a chain.

For example, the drive bevel gear 36 of the above embodiment
And a bevel gear 52 as a chain sprocket, a chain is bridged between the two, and a driving force from the motor 22 is transmitted to a sprocket meshing with the chain via a one-way clutch after deceleration. The load and vehicle speed detection mechanisms can be used as they are.

[Brief description of the drawings]

FIG. 1 is a side view of a motorcycle to which a driving force assist device according to an embodiment of the present invention is applied.

FIG. 2 is a sectional view showing a configuration of a first half of a drive system.

FIG. 3 is a cross-sectional view illustrating a configuration of a rear half of a drive system.

FIG. 4 is a sectional view showing a pole ratchet type one-way clutch unit.

FIG. 5 is a cross-sectional view showing a drive transmission portion by a spring.

FIG. 6 is a view showing a groove cam and a pin provided on a projection of a bevel gear.

FIG. 7 is a diagram showing a shape of a tip of a projection of a sensor ring.

FIG. 8 is a diagram showing an output waveform of a Hall sensor.

FIG. 9 is a circuit diagram of a drive control system of the motor.

FIG. 10 is a diagram illustrating output characteristics of a hall sensor with respect to a pedal depression force.

FIG. 11 is a view showing a modification of the shape of the tip of the projection of the sensor ring.

FIG. 12 is a view showing a modification of the shape of the groove cam.

[Explanation of symbols]

1 ... two-wheeled vehicle, 2 ... head pipe, 3 ... main frame,
5 ... seat post, 8 ... front fork, 9 ... front wheel,
10 ... rear wheel, 13 ... bracket, 14 ... crankshaft case, 15
... Crankshaft, 16 ... Pedal arm, 17 ... Pedal, 18 ... Gear case, 19 ... Drive shaft, 20 ... Cylinder cover, 21
... Axle case, 22 ... Motor, 23 ... Battery, 24 ... Control unit, 25 ... Mounting bolt, 30 ... One-wete clutch, 31 ... Ratchet pole, 32 ... Biasing means, 35 ... Center boss, 36 ... Drive bevel gear, 37… Spring,
38… Sensor ring, 39… Pin, 40… Presser fitting, 41… Compression spring, 42… Hall sensor, 44… Bearing,
45, 46 ... bevel gear, 47, 48 ... bearing, 49 ... rotating cylindrical shaft, 50 ... pivot, 51 ... needle bearing, 52 ... bevel gear, 53 ... lid member, 54 ... nut, 55 ... wheel hub, 56
... nuts, 57 ... spokes, 58 ... nuts, 60,61 ... gears,
62 ... rotating shaft, 63 ... gear, 64 ... rotating shaft, 65 ... gear, 66 ... one-way clutch, 70 ... amplifier, 71 ... power transistor, 136 ... groove cam, 138 ... sensor ring, 236 ... groove cam, 238 ... sensor ring.

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[Procedure amendment]

[Submission date] July 16, 1999

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0002

[Correction method] Change

[Correction contents]

[0002]

2. Description of the Related Art Various bicycles with an electric motor have been proposed in the prior art. For example, the bicycle disclosed in Japanese Patent Application Laid-Open No. 4-358895 has a motor drive shaft protruding substantially downward below a seat tube of an automobile. An electric motor is housed therein, and the rotation of the motor drive shaft is transmitted to the crankshaft via a one-way clutch. The motor current that changes in accordance with the amount of manual operation of the accelerator lever attached to the handlebar is supplied to the electric motor. "The planetary gear mechanism
Treading force sensor 90 for detecting the driving reaction force of the link shaft 28 (FIG. 1)
Cf.). "
Although the structure is not always clear, it can be seen from FIG.
Equipped with a pedal force sensor that protrudes around the crankshaft
Need to be

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0003

[Correction method] Change

[Correction contents]

[0003]

The electric motor is arranged above the crankshaft because the motor drive shaft projects substantially downward to transmit power to the crankshaft via a one-way clutch. that reason, there is a danger of being stepping stones and the water from the front directly. Further around the crankshaft
A space for disposing a torque detection sensor and the like is also required.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction contents]

[0006]

Means and Actions for Solving the Problems
In order to achieve this, the present invention
To the drive transmission means for transmitting the motor drive force to the drive wheels
Electric motor to assist human powerAssist unit with
And extend rearward and downward from the head pipe on the pedal crankshaft.
At the top, and hold the sheet at its upper end.
And a frame member.
Battery and controller are included, and the controller
Electric motor that controls the power supply from the battery to the electric motor
Bicycles with pedals that support the pedal crankshaft.
Link shaft caseIncluding the assist unitThe frame
Mounted on the lower part of the
Assist unitThe electric motor is integrated with the motor drive shaft
It is provided to be oriented in a substantially horizontal direction,On pedal crankshaft
Generates displacement in the crankshaft direction according to the size of human power
Displacement means for causingTreading force detecting means to detect
And vehicle speed detecting means for detecting the vehicle speedAnd the assist unit
Attached to the unit,The pedaling force detection means and the vehicle speed detection
The electric motor is driven by the controller according to the output of the output means.
The bicycle has an electric motor that controls the output of the motor.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction contents]

[0007] Since the rear electric motor integral with the crankshaft case in the pedal crankshaft Ru provided substantially be directed in the horizontal direction of the motor drive shaft, crankshaft positioned on the front side with respect to flying stones and the water from the front The case can protect the electric motor. Further, since the heavy electric motor is provided at the same height as the pedal crankshaft, the center of gravity of the vehicle body can be reduced, and the lightness of the bicycle is not impaired. Moreover, the displacement means is large in human power on the pedal crankshaft.
A displacement amount corresponding to the displacement is generated in the crankshaft direction.
Since the pedaling force detecting means detects the position, the pedal crankshaft
There is no need for space around the detector,
Therefore, equip the electric motor behind the pedal crankshaft.
The front and back length of the assist unit is smaller
Small, compact assist unit
Can be knit.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0044

[Correction method] Change

[Correction contents]

Accordingly, the driving force assisting mechanism is unitized as an assist unit together with the pedal depression force detecting mechanism. Moreover, in the pedal force detection mechanism,
The amount of displacement according to the human force applied to the shaft 15 is the sensor ring 38
The amount of movement in the direction of the crankshaft
Large space is needed around the pedal force detection
The front and rear length of the assist unit can be kept small.
Wear. The motor 22 is located in the vicinity of the crankshaft 15, and its drive shaft projects rearward and is directed in a direction orthogonal to the crankshaft 15. ing.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0046

[Correction method] Change

[Correction contents]

The pedal force detecting means for detecting a depression force detecting a depression force applied to the crank shaft 15 to the crank shaft casing 14 <br/> can easily detect the vehicle speed at the same time, the driving force assist mechanism
As a unit as an assist unit, the reliability of the system can be improved by making the system compact, and the simple appearance of a bicycle can be maintained.

Claims (1)

[Claims] 1. An electric motor for transmitting a motor driving force to a drive transmitting means for transmitting a driving force of a pedal human power driving means to driving wheels and assisting human power, and an electric motor extending rearward and downward from a head pipe and upward at an upper portion of a pedal crankshaft. A bicycle with an electric motor that includes a frame member that holds a seat at its upper end, and that includes a battery and a controller in the internal space of the frame member and controls power supply from the battery to the electric motor with the controller. A crankshaft case supporting a pedal crankshaft is attached to a lower portion of the frame member, and an electric motor is provided integrally with the crankshaft case behind the pedal crankshaft so as to direct a motor drive shaft in a substantially horizontal direction. Pedal force detecting means for detecting the pedaling force applied to the pedal crankshaft to the shaft case and vehicle speed for detecting vehicle speed A bicycle with an electric motor, further comprising a detection unit, wherein the controller controls the output of the electric motor in accordance with outputs of the pedaling force detection unit and the vehicle speed detection unit.