JPH1170890A - Drive unit for motor assisted bicycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drive unit for a motor assisted bicycle, which is light in weight, and inexpensive, and can dispense with a control system with a complex form. SOLUTION: In this drive unit for a motor assisted bicycle, the torque of a motor 31 is transmitted to a driving side chain sprocket 4 by way of the crank shaft 39 of a footing pedal, an epicyclic roller reducer 40 which makes the output shaft of the motor 31 as a sun roller shaft, and a two stage gear reducer 50 for further reducing the output, and concurrently, the torque of the motor 31 at this time can be transmitted to the driving side chain sprocket 4 on condition that the aforesaid torque exceeds a definite footing torque value.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric bicycle drive unit.
Knit, especially for driving bicycles with auxiliary drive
Deceleration unit and step torque detection built in the unit
This is useful when applied to a part of an output device. 2. Description of the Related Art Conventionally, Japanese Patent Application Laid-Open No. 56-149277
Electric motors used as auxiliary power for bicycles
An example of the data arrangement and functions is shown in FIGS.
Therefore, it will be described. The first freewheel on the rear wheel hub 1
The first freewheel 3 and the second freewheel 3 are attached.
The wheel 2 has a first
The first freewheel 3 is suspended, and the second freewheel 3 is driven.
Chain sprocket 7 attached to the output shaft of motor 6
The second chain 8 is suspended between the first chain and the second chain. In the middle of the first chain 5, the same chain 5
5 by detecting the magnitude of the tension applied thereto, and detecting the amount of electricity (for example,
Torque detection for conversion into resistance or capacitance)
An output device 9 is provided, and the pedal 14 and the crank 1
5, the tread transmitted through the drive chain sprocket 4
The tension applied to the first chain 5 due to the penetration force,
Detecting as the rotation angle of the rotation axis of the torque detector 9
It is configured to be able to. When starting, accelerating, or climbing a hill,
When the pedal 14 is depressed, the angle depends on the depressing force
The torque detector 9 rotates. When the torque detector 9 is decided
When the motor rotates more than the specified angle, power is supplied to the motor 6.
And a chain pump attached to the output shaft of the motor 6.
7 rotates, and the second freewheel passes through the second chain 8.
The wheel 3 is rotated to drive the rear wheels. So the rear wheel is a person
Driven by the combined torque of both force and motor 6.
And As described above, in the above-described auxiliary power unit, the second
Chain 8 is wrapped around the output end of the power plant
The width of the power unit is larger than the width of the bicycle.
As well as the output shaft is cantilevered and easily bent
It was difficult to balance left and right. In addition, power
Excessive weight distribution on the rear wheels as the device is placed closer to the rear wheels
And the front wheels become too light and the operation of the bicycle becomes unstable
It tends to be. [0006] Therefore, solving the above-mentioned problems,
The shaft (width) direction is compact and the weight distribution of the front and rear wheels is good.
What is required is an easy-to-handle product.
A proposal has been made. For example, Japanese Unexamined Patent Publication No. 7-40878
The electric power unit is arranged coaxially with the crankshaft
And place the electric motor in front of the vehicle body from the crankshaft.
Improve the balance of the weight distribution of the body as a bicycle,
Sometimes pedal force torque detection means in the power unit, one direction
One that contains a clutch or the like has been proposed. Place
However, even in this case, there are difficulties in weight and cost.
You. [0007] An electric power supply with an auxiliary power unit is provided.
Dynamic bicycles are mainly powered by input, and are foot pedals.
As the emphasis is on the feeling of a normal bicycle,
Knitwear is required to be lighter and cheaper,
The control system is also required to be a simple system. [0008] In view of the above prior art, the present invention is lightweight and inexpensive.
Electric bicycle that is simple and requires only a simple control system
It is an object to provide a drive unit for use. [0009] The present invention for achieving the above object.
The configuration of Ming is characterized by the following points. 1) Concentricity with the crankshaft of the foot pedal
A motor with a force axis and an output shaft of this motor
Planetary roller reducer and reduction of this planetary roller reducer
Two-stage gear reducer that further reduces the speed shaft rotation, and this two-stage gear reducer
First one direction interposed in the power transmission path of the gear reducer
A clutch, which meshes with an output shaft of the two-stage gear reducer;
Drive-side chain having the last gear first gear
The rocket and the pedal pedal crankshaft are supported via bearings.
The rotation of the same crankshaft is
A second one-way clutch for transmitting to the first tooth
A second gear having the same meshing pitch diameter as the wheel;
Elastic body provided on one gear and second teeth engaged with the elastic body
The size of the stepping torque
Angular displacement mechanism expressed by the angular displacement associated with
Angle to detect angular displacement generated in angular displacement mechanism
It has a displacement detection mechanism and corresponds to the magnitude of the stepping torque.
It is configured to control the output torque of the electric drive. 2) An electric bicycle drive unit according to 1).
In knits, the angle changes according to the magnitude of the stepping torque.
A plurality of angular displacement mechanisms for detecting the position are provided on the side of the first gear.
Equally arranged circumferential penetration holes and stored in the same holes
Multiple compression springs and one direction of rotation
And a second gear protruding member engaged with the second gear.
The compression spring shortens in proportion to the stepping torque,
It is designed to represent the relative angular displacement between vehicles.
That. 3) The electric bicycle drive unit according to 2).
Converting the stepping torque into angular displacement in a knit
Set in the circumferential long hole on the side of the first gear of the angular displacement mechanism.
The initial pressure is applied to the multiple compression springs
Do not make relative angular displacement between both gears while it is small
To limit the energizing range of the motor. 4) The electric bicycle described in 2) or 3)
Drive unit, the first gear and the second gear
The angular displacement detection mechanism for detecting the relative angular displacement of
Mesh with the first and second gears and rotate coaxially
And a pair of gears, one on each side
Recessed ridges formed opposite to each other and distributed equally on the annular side surface
Shape cam and this concave chevron cam are urged in the direction to push each other.
Compression spring and the cam surface of both concave chevron cams
And a plurality of rollers placed in a parallelogram
When the relative angular displacement of both gears occurs,
The indented concave cam is displaced and the roller rides on the cam.
The movement of the two gears when they move away from each other in the axial direction
The moving distance is taken out by the slide plate and the lever.
Measure the displacement with a displacement detector and use it as a motor output control signal.
It was configured as follows. 5) Concentric output with the pedal pedal crankshaft
A motor having a power axis and an output shaft
And a planetary roller speed reducer
A two-stage gear reducer that further reduces the rotation of the reduction shaft;
First one interposed in the power transmission path of the stepped gear reducer
Meshes with the output clutch of the two-stage gear reducer
Drive chain having a concentric last stage first gear
Proquette and foot pedal crankshaft through bearings
And the rotation of the crankshaft is
A first one-way clutch for transmitting to the rocket;
A second gear having the same meshing pitch diameter as the first gear;
The third gear meshing with the first gear and the second gear
The meshing fourth gear is arranged coaxially, and the stepping torque
Is transmitted via the two gears, and the third gear and the third gear
Transmission torque in the axial direction by the transmission torque between the gear 4
Detection mechanism that acts to produce a displacement proportional to
With electric drive according to the magnitude of the stepping torque.
It is configured to control force torque. 6) An electric bicycle drive unit according to 5).
In the knit, transmission between the third gear and the fourth gear
The torque causes a displacement in the axial direction that is proportional to the transmission torque.
The torque detection mechanism with the function of
Attached to each side and distributed in equal numbers on the annular side face and formed facing each other
And the direction in which the concave cams are pushed together.
And the cam surfaces of both concave chevron cams
Plural placed between parallelograms formed by
And a roller.
When an angular displacement occurs, the concave cams facing each other are displaced.
As the roller rides on the cam, both gears
The moving distance when moving in the axial direction to the sliding plate and lever
And measure the displacement at this time with a displacement detector.
The motor output control signal is configured. 7) An electric bicycle drive unit according to 6).
In the knit, it became a pair of the stepping torque detection mechanism
First compression spring urged in the direction to push concave cams
When pressure is applied and the stepping torque is small, the relative
Control the motor's force range so that
That it is limited. 8) For an electric bicycle described in 1) to 3)
In the drive unit, the first gear and the second gear
Angular displacement detection mechanism that detects relative angular displacement
The bearings are rotatably supported by bearings, and several
A helical groove shaft having a helical groove disposed therein and the first gear;
A third gear fixedly engaged with the helical groove shaft;
The gear rotates on the helical groove shaft while meshing with the second gear.
The sliding inner and outer stages slide freely in both the rolling direction and the axial direction.
The same number of shafts as the helical groove of the helical groove shaft
A fourth gear having a dead-end groove parallel to the line,
For the helical groove of the helical groove shaft and the dead end groove of the fourth gear
The same number of balls as the helical grooves engaged simultaneously, and the same balls
Holding the ball deep inside the dead end groove of the fourth gear
Means for biasing the fourth gear in the direction of pushing the third gear toward the third gear
And the distance that the fourth gear moves in the axial direction.
Detection means for outputting an output motor output control signal.
thing. 9) Ball holding means, biasing means and 8)
And the detecting means is a circle fitted into the step of the inner cylinder of the fourth gear.
Of the annular plate, and the seat plate fixed to the annular plate and the helical groove axis.
Biased in the direction to push the fourth gear toward the third gear side
The compression spring has a
Correspondingly, the relative angular displacement of the first gear and the second gear is
When this occurs, the fourth gear is not angled with respect to the third gear
The fourth gear moves along the helical groove
The distance traveled in the axial direction by being pushed by the ball
Take it out with the lever that is in contact with the side of the gear,
The amount of displacement is measured by a displacement detector and the motor output control signal
It was configured to be. 10) The electric bicycle described in 1) to 3)
Drive unit, the first gear and the second gear
The angular displacement detection mechanism that detects the relative angular displacement of
The bearings are freely rotatable by bearings, and multiple
A helical groove shaft having a helical groove disposed therein, and the first gear
A third gear fixed to the helical groove shaft;
While being engaged with the second gear, it rotates around the helical groove shaft.
It is slidable in both the rolling direction and the axial direction, and
The same number of the same helicopters engaging with the helical groove of the helical groove shaft
And a fourth gear on which a projection having a cull angle is disposed.
And the first gear corresponds to the magnitude of the stepping torque.
When a relative angular displacement occurs between the fourth gear and the second gear,
Is shifted with respect to the third gear, so that the fourth
Motor that detects the distance that the gear moves along the helical groove
Providing detection means for output control signals. 11) The detecting means of 10) is a fourth gear
The distance that the helical groove moves along the side of the fourth gear
Is removed by the lever that is in contact with
Measure the amount with a displacement detector and use it as a motor output control signal.
That it was configured. 12) The drive for an electric bicycle described in 8)
Relative angular displacement of the first and second gears of the unit
The fourth gear
Ball bearing that fits externally on the stepped shaft cylinder
A bearing press ring that fits over the
In the direction that pushes the fourth gear toward the third gear.
And a helical shaft on the casing.
The bearing retaining ring, which is fixed in parallel, is
And the first gear and the first gear in accordance with the magnitude of the stepping torque.
When a relative angular displacement occurs in the second gear, the fourth gear
The deviation of the angle with respect to the third gear causes the fourth tooth
The car is pushed by the ball moving along the helical groove
Distance through the ball bearing and the bearing retainer ring.
And the lever is in contact with the side of the bearing presser ring.
And measure the amount of displacement with a displacement detector at this time.
It is configured to be an output control signal. 13) An electric bicycle drive described in 10)
Change in relative angle between the first gear and the second gear of the moving unit
In the angular displacement detecting mechanism for detecting the position, the fourth tooth
A ball bearing that fits outside the stepped shaft cylinder of a car, and the ball shaft
Bearing retaining ring externally fitted to the bearing, bearing retaining ring and casing
And pushes the fourth gear toward the third gear.
A biased compression spring and a helical shaft
And the non-rotating shaft of the bearing press ring fixed in parallel with
The first gear corresponding to the magnitude of the stepping torque;
When a relative angular displacement occurs between the fourth gear and the second gear,
Is shifted with respect to the third gear, so that the fourth
The distance that the gear moves along the helical groove
The bearing abuts the side surface of the bearing retaining ring via the bearing retaining ring.
Take out the lever with the lever
The motor output control signal is measured by a detector
Was it. 14) The electric bicycle described in 1) to 3)
Drive unit, the first gear and the second gear
The angular displacement detection mechanism that detects the relative angular displacement of
It is supported by bearings so that it can rotate freely.
A serration shaft having a luceration portion;
A third gear fixed to the serration shaft
And the gear while meshing with the second gear.
It is free to slide in both the rotation direction and the axial direction.
The bush is fitted inside the inner cylinder and the serration is
Same helical angle to engage the helical serration of the shaft
A fourth gear having a serration within degrees,
A ball bearing that fits externally on the stepped shaft cylinder of the gear, and the same ball
Bearing retainer ring that fits around the bearing, and the bearing retainer ring and casing
Direction that pushes the fourth gear toward the third gear side
And a helical compression spring
A detent shaft of the bearing presser ring fixed parallel to the shaft;
The first corresponding to the magnitude of the stepping torque
When the relative angular displacement occurs between the gear and the second gear, the fourth gear
Is shifted in angle with respect to the third gear,
The distance that the fourth gear moves along the helical serration
Release the ball bearing and the bearing retainer via the bearing retainer ring.
Take it out with the lever that is in contact with the side of the ring.
Of the motor output control signal
That it was configured to. 15) An electric bicycle drive according to 14)
Change in relative angle between the first gear and the second gear of the moving unit
In the angular displacement detecting mechanism for detecting the position, the second tooth
Slidingly engages with the serration shaft while engaging with the car
Instead of the fourth gear internally fitted with a bush
Rotating direction on the shaft part of the serration shaft while meshing,
It is slidable in the axial direction, and the part of the same inner cylinder is
Internal serration that engages the helical serration on the serration shaft
Incorporates a fourth gear with low friction coefficient
It was composed of. 16) The electric bicycle described in 1) to 3)
Drive unit, the first gear and the second gear
The angular displacement detection mechanism that detects the relative angular displacement of
It is supported by bearings so that it can rotate freely.
A serration shaft having a luceration portion;
A third gear fixed to the serration shaft
And the gear while meshing with the second gear.
It is free to slide in both the rotation direction and the axial direction.
Insert a bush made of low friction material into the inner cylinder
Engages with the helical serration on the serration shaft
Fourth tooth with internal serrations of the same helical angle
A car and a ball externally fitted to the stepped barrel portion of the fourth gear
The case is attached to the bearing and one protruding end provided on the ring-shaped plate.
The fourth tooth on both sides of the ring having a fulcrum abutting the ring;
A projection that abuts the outer ring side surface of the axle ball bearing and becomes a point of emphasis.
A plate protruding on the opposite side of the fulcrum of the ring
Lever that forms the point of action
It is inserted into the hole provided in the action point plate of the lever
Lock pin parallel to the serration axis and lever lever
The ball bearing of the fourth gear shaft is
Compression spring urged to push and action of lever lever
Displacement detector that changes the moving distance of a point into angular displacement
The first step corresponding to the magnitude of the stepping torque.
When a relative angular displacement occurs between the gear and the second gear, the fourth
When the gear is shifted in angle with respect to the third gear, the
Distance that gear 4 moves along helical serration
Is in contact with the outer ring side surface of the ball bearing of the fourth gear shaft.
The lever lever doubles the displacement of the lever lever action point
The amount is taken out by the displacement detector and the detected value is output to the motor.
It is configured to be a control signal. 17) An electric bicycle drive described in 16)
Change in relative angle between the first gear and the second gear of the moving unit
In the angular displacement detecting mechanism for detecting the position, the fourth tooth
Externally fitted to the ball bearing of the stepped shaft cylinder of the car and fixed to the casing.
Shaft whose rotation direction is restricted by the installed detent pin
A retaining ring is additionally provided, and the ball shaft is inserted through the bearing retaining ring.
Projections on both sides of the ring portion of the lever lever on the outer ring side surface of the bearing
Has been configured to abut. Embodiments of the present invention will be described below with reference to the drawings.
It will be described in detail based on FIG. The same as FIGS. 24 and 25
Parts are given the same reference numerals. The present invention relates to a driving power of a bicycle,
The electric power supplied from the portable battery to the power from the pedal
Drive by adding the auxiliary power of the
Uses dynamic power to facilitate bicycle driving with less human power
Drive unit for an electric bicycle as an auxiliary drive device
You. In this case, the electric bicycle is driven selectively using only the human pedal.
You can also FIG. 1 shows an electric rotation according to an embodiment of the present invention.
FIG. 3 is a side view of the electric bicycle with the vehicle drive unit attached.
You. As shown in FIG.
The frame 18 has an electric motor at the position of the crank hub.
The turning drive unit 30 (70) is attached.
The pedal crank 15 has a pedal attached to its tip.
You. The chain 5 has one axis on the axis of the rear wheel 17 of the bicycle 16.
Driven side chain attached via way clutch
Rocket 3 and drive side of electric bicycle drive unit 30
Chain sprocket 4 is suspended, and chain 5 is human-powered
Alternatively, the rotational force of the electric bicycle drive unit 30 is
6 to the shaft of the rear wheel 17. In the figure, 77 is rechargeable
The battery 78 indicates a controller. FIG. 2 shows a first embodiment of the present invention.
Of the electric bicycle drive unit 30 according to the embodiment of the present invention.
FIG. 3 is an angular displacement accompanying the stepping torque in FIG. 2.
FIG. 4 is a partial view showing the mechanism, and FIG. 4 is a sectional view taken along line AA of FIG.
FIG. 5 shows the angular displacement associated with the stepping torque in FIG.
It is a perspective view showing a roller portion of the output angular displacement detection mechanism,
6 is a partial view of the angular displacement detection mechanism in FIG. 2, and FIG.
Pressure on the concave chevron cam of the angular displacement detection mechanism
BB sectional drawing which showed the structure of the compression ring which applies a contraction spring force.
is there. FIG. 8 shows the electric bicycle drive unit 30 of FIG.
Block diagram showing the power transmission and control system of the attached bicycle
is there. As shown in these figures, the motor 31
Space formed by surrounding the data casing 38 and the middle wall 74
It is located inside. The stator 32 of the motor 31 is
Exciting coil fixed inside the motor casing 38
Is wound. The rotor 34 of the motor 31
A plurality of permanent magnets 33 disposed in
is there. That is, this motor 31 is a structure of an induction motor.
The rotation speed is controlled by the frequency control by the inverter.
Control and torque control are performed by current control. The rotor 34 is moved from the middle wall 74 to the speed reduction mechanism side.
Hollow sun roller shaft 3 protruding to form sun roller
5 is fixed. The sun roller shaft 35 has a motor-side shaft end
Supported by a motor casing 38 via a bearing 36,
The roller side is supported by a middle wall 74 via a bearing. One end side of the speed reduction mechanism casing 41 is the middle wall 7
4 and is integrally connected to the motor casing 38,
The end side is integrally connected to the casing lid 52 and closed.
Form a power mechanism casing. Reduction mechanism casing 4
In order to concentric with the sun roller shaft 35, two
The inner roller 43 positioned by the pin 46 is fixedly provided.
To circumscribe the sun roller shaft 35 and
A plurality of planetary rollers 42 inscribed on the planetary roller shaft 44
More rotatably supported, the planetary roller carrier 45
These planetary roller shafts 44 are divided at equal intervals in the circumferential direction.
Fixed at a position where the planetary roller reducer 40
ing. The planetary roller carrier 45 has a hollow outlet.
The power shaft is rotatably supported on the crankshaft 39 via a bearing.
The shaft end forms a pinion 45a. Pinion 4
The large gear 53 meshing with the first one-way clutch 5a
Supported by the gear shaft 54 via the
Only the power from is transmitted to the gear shaft 54
I have. The gear shaft 54 has an integral gear 54a
And a shaft for the reduction mechanism casing 41 and the casing lid 52.
It is rotatably supported via a receiver. On the gear 54a
The first gear 56 at the last stage concentric with the crankshaft 39 meshes.
Matching. Thus, the pinion 45a, the large gear 53, the teeth
Two-stage gear reduction mechanism by combination of wheel 54a and gear 56
50. The gear 56 has a driving chain sprocket 4
Is fixed. The gear 56 is connected via a bearing 49
The casing is supported rotatably by the casing lid 52 and the crank
One end of the shaft 39 is rotatably supported via a bearing 48.
You. The other end of the crankshaft 39 is connected to a motor via a bearing 37.
It is supported by a casing 38. The second gear 57 has a bearing on the crankshaft 39.
Rotatably supported through the same meshing pin as the gear 56.
This is a gear having a notch diameter. This gear 57 has a crank
The rotation of the shaft 39 is transmitted by the second one-way clutch 58.
It is. The one-way clutch 58 is connected to the
When the force by the dull crank 15 is input in the forward direction
The direction of the claws of the clutch is configured to be engaged. As shown in FIG. 3 and FIG.
Provided on the surface are circumferentially extending long holes arranged in multiple equally
A plurality of compression springs 59 are housed in the elongated holes,
Attached to the gear 57 in only one direction of rotation on the compression spring 59
The projected member 69 is engaged with the angular displacement mechanism 60 (FIG. 2).
Reference). This angular displacement mechanism 60 includes a gear
Stepping torque transmitted from 57 via the protruding member 69
Is received by a compression spring 59 provided on the gear 56,
The compression spring 59 is shortened in proportion to the torque, and between the two gears 56,
Relative angle corresponding to the magnitude of stepping torque between 57
It is configured so that displacement occurs. The stepping torque is
Via the angular displacement mechanism 60, the drive-side chain
(See FIG. 2). The gear 56 of the angular displacement mechanism 60
Initial pressure is applied to the plurality of compression springs 59, and the stepping torque is small.
In the meantime, there is no relative angular displacement between the two gears 56, 57.
It is possible to limit the range of the motor 31
it can. In this case, the control circuit is simplified. Next, FIG. 2, FIG. 5, FIG. 6, and FIG.
The relative angle change between the gear 56 and the gear 57 of the angular displacement mechanism 60
The configuration of the angular displacement detection mechanism 61 that detects the position will be described.
As shown in these figures, the gear 62 meshing with the gear 56
And the gear 63 meshing with the gear 57 have the same meshing pitch.
It has a diameter and rotates coaxially. The gear 62 is a nut 76
To be integrated with the support shaft 64 by
And the speed reduction mechanism casing 41 and the casing
It is rotatably supported by the lid 52. Gear 62 cylindrical
The inner diameter portion of the gear 63 fits into the portion, and the cylindrical portion of the gear 62
A compression spring 90 is housed inside the sliding plate 66 (or slide).
Gear 6 via a pressing ring 67
Pressing 3. As shown in FIG. 7, which is a cross section taken along line BB of FIG.
The cylindrical portion of the gear 62 has a notch 6 parallel to the rotation axis.
2a are provided at a plurality of equal angles, and a plurality of projections of the pressing ring 67 are provided.
67a penetrates the notch hole 62a, and the gear 63
Is pressed. As described above, the gear 56 and the gear 57 form a relative angle.
When a degree displacement occurs, the angular displacement is caused by the gear 62 and the gear 6
3, the notch hole 6
2a is sufficient for the protrusion 67a to move in FIG.
The air gap s is provided. A concave mountain is formed on the annular side surface of the support shaft 64.
A plurality of cams 64a are formed in equal distribution, and
A concave chevron cam 63a is formed on the annular side surface of the facing gear 62.
And the gear 5 of the angular displacement mechanism 60
When there is no relative angular displacement between 6, 57,
The concave cams 63a and 64a face each other, and a plurality of rollers
65 is located at the bottom of both cams. The pressing force of the compression spring 90 is
When sandwiched between the chevron cams 63a and 64a, the position is not
And the torque due to the stepping force causes the angular displacement
Minimize the torque component when passing through the detection mechanism 61
I have less. In the above configuration, the gear 62 and the gear 6
3 when the relative angular displacement with respect to 3 occurs
The cams 63a and 64a are displaced (indicated by m in FIG. 6).
S) When the roller 65 rides on the cam,
62, 63 move away from each other (indicated by n in FIG. 6).
This moving distance n is measured by the slide plate 66 and the lever 86.
And a displacement detector (for example, potentiometer)
Measure at 85 and use this as the signal of the stepping torque
Force control function. Rotation speed attached to casing lid 52
The detection sensor 89 detects the proximity of the teeth of the gear 54a.
A drive unit 30 for a driving bicycle, which is a contact type sensor
The output rotation speed of the rotation speed detection sensor 8 during the unit time
9 with the number of teeth detected by the gear 54a passing through the sensor
It is a method of measuring. The operation of the electric bicycle drive unit 30 will be described.
To use the drive unit 30 for the electric bicycle.
FIG. 8 is a block diagram showing a power transmission and control system of the turning vehicle.
Will be described. Step on the pedal to drive the crankshaft 39
At this time, the stepping torque is applied to the gear 5 at the one-way clutch 58.
7 and the angle change constituted by the gear 57 and the gear 56.
The drive side chain sprocket 4 is moved via the
The chain driven by the drive side chain sprocket 4
5 is provided via a one-way clutch 3 provided on the rear wheel hub.
Turn the rear wheel 17 of the turn. Crankshaft 39 is stopped
Then, the driving side chain sprocket 4 is turned in the traveling direction.
Occasionally, the clutch idles without engaging the clutch. When the stepping torque exceeds a certain value (before
As described above, the initial pressure is applied to the compression spring 59 of the angular displacement mechanism 60.
When given), the gear 57 and the gear of the angular displacement mechanism 60
56 is a relative angle change proportional to the torque passing therethrough.
And the amount of angular displacement is determined by the tooth of the angular displacement detecting mechanism 61.
Inform the wheels 62, 63, and the concave mountain cams 63a, 64a and low
The angular displacement is replaced by the axial displacement by the
The angular displacement is measured by the angular displacement detector 85 (stepping
(Luq) and take it out as electric signal proportional to
Send to 78. In the controller 78, the stepping torque is
Calculate the auxiliary rate (1 or less) for the power circuit,
Provide the necessary motor output from the battery 77 so that the required motor output can be obtained.
The supplied electric power is controlled and sent to the motor 31. Motor 31
Planetary roller speed reducer 40 directly connected to the output shaft and two-stage gear reduction
The speed is reduced to the required rotation by the speed mechanism 50, and the required torque is reduced.
Output to the drive side chain via the one-way clutch 55.
Turn sprocket 4. Thus, the motor 31 side
The drive mechanism can assist the stepping torque
You. When the bicycle runs only by stepping,
The rotation is cut off in the direction clutch 55 and the motor 31 side
It does not reach. Also, a bicycle that is being driven auxiliary is determined.
If the speed is higher than the
Signal causes the controller 78 to operate and stop the motor 31
I do. The drive unit 30 is mounted on the high-speed section in the previous stage.
Because the star roller reducer 40 is used, vibration and noise
The motor 31 and the speed reduction mechanism
The entire length and outer diameter are compact. [Second Embodiment] FIG. 9 shows a second embodiment of the present invention.
Of the electric bicycle drive unit 70 according to the embodiment of the present invention.
FIG. 10 shows the electric bicycle drive unit 70 of FIG.
Block showing power transmission and control system of the mounted bicycle
FIG. The drive unit 70 according to the present embodiment
Angle displacement mechanism 60 and angle displacement detection mechanism in one embodiment
61 and the other components.
Is the same as in the first embodiment,
The description of the overlapping parts will be omitted. As shown in FIG. 9, the rotational torque on the speed reducer side
Is the first stage gear via the one-way clutch 55
Of the driving side gear fixed to this gear 71.
Rear wheel of bicycle by Ensprocket 4 and Chain 5
Drive. The gear 71 is simultaneously driven by the angular displacement detection mechanism 81.
It is configured to mesh with the gear 62. Gear 62 is made of steel
Alternatively, it can be suitably made of a plastic material. On the other hand, the stepping torque is one less than that of the crankshaft 39.
Transmitted to the second gear 72 via the directional clutch 58,
The wheel 72 meshes with the gear 73 of the angular displacement detection mechanism 81 and rotates.
Transfer rolling torque. As a result, the rotation transmitted to the gear 73
The torque is the concave chevron 73a of the angular displacement detection mechanism 81,
The gear 62 and the roller 62 and the concave chevron 64a
And transmitted to the gear 71 meshing with the
The sprocket 4 and the chain 5 are driven. Gear 72
It can be made of steel or plastic material with low coefficient of friction.
You. The structure of the angular displacement detecting mechanism 81 is a compression spring.
Except that 75 is strong.
This is the same as the angular displacement detection mechanism 61. That is,
In the case of the embodiment, the total amount of the stepping torque is detected as the angular displacement.
Since the compression spring 75 passes through the mechanism 81,
Step between the roller 73 and the concave chevron cam 64a and the roller 65
Relative to the magnitude of the torque generated by the torque
It is necessary to have a large spring constant to support the deviation. This
The moving distance in the axial direction at the time of
And the displacement is measured by a displacement detector 85.
Is used as a signal of the stepping torque value to perform motor output control. In the inner cylinder of the gear 62 of the angular displacement detecting mechanism 81
By applying initial pressure to the compression spring 75 stored in the
While the stepping torque is small, the relative
To prevent the motor 31 from
The range can be limited. The operation of the electric bicycle drive unit 70
To use the electric bicycle drive unit 70.
FIG. 1 is a block diagram showing a power transmission and control system of a turning vehicle.
Description will be made by adding 0. Step on the pedal to drive the crankshaft 39
And the stepping torque is one-way clutch 5 from the crankshaft 39.
8 is transmitted to the gear 72, and the gear 72 detects the angular displacement.
The gear 730 of the mechanism 81 meshes to transmit the rotational torque,
The rotation torque transmitted to 73 is transmitted to the angular displacement detection mechanism 81.
Concave cam 73a, roller 65 and concave cam 64a
To the gear 62 and the gear 71 meshing with the gear 62
Transmitted to the drive side chain sprocket 4 and chain 5
Drive. When the stepping torque exceeds a certain value (before
As described above, the initial pressure is applied to the compression spring 75 of the angular displacement detection mechanism 81.
When a force is applied), the gear 7 of the angular displacement detection mechanism 81
3 and the gear 62 are relatively proportional to the torque passing therethrough.
A large angular displacement. This is the angled cam 73a, 64a
Roller 65 converts the amount of angular displacement into the amount of axial movement.
Replacement and angular displacement by angular displacement detector 85
(Electric signal proportional to (stepping torque))
Send to Troller 78. In the controller 78,
Calculates the auxiliary ratio (less than or equal to 1) for the torque to the power circuit
Battery 77 so that the necessary motor output can be output.
To control the power supplied from the
This is to assist the stepping torque. When the bicycle runs only by stepping,
The rotation is cut off in the direction clutch 55 and the motor 31 side
It does not reach. Also, a bicycle that is being driven auxiliary is determined.
If the speed is higher than the
Signal causes the controller 78 to operate and stop the motor 31
I do. [Third Embodiment] Drive Unit
Based on FIG. 11, FIG. 12 and FIG.
In one embodiment, the gear 56 of the angular displacement mechanism 60
Angular displacement detection mechanism 6 for detecting relative angular displacement of gear 57
The structure of an angular displacement detection mechanism 91 of another example which is a simplified version of FIG.
explain. Drive units other than the angular displacement detection mechanism according to the present embodiment
The knit portion is the same as that in the first embodiment.
Since the angular displacement mechanism 60 has the same configuration,
Parts are assigned the same reference numerals, and descriptions of overlapping parts are omitted.
I do. As shown in these figures, the gear 56
The gear 93 that meshes with the gear 93 that meshes with the gear 57 is the same.
The gear 93 has a meshing pitch diameter and the helical groove shaft 92
And the gear 94 is connected to the
It is rotatably and slidably supported by the cull shaft 92. Helicopter
The cull groove shaft 92 has a reduction mechanism cable at both ends via bearings.
Leasing 101 (in the unit of the first embodiment)
Only the portion shown in FIG.
Shape) and casing lid 102 (first implementation)
The casing lid 52 in the unit of
Only the part that changed the shape)
ing. Helical groove shaft 92 has the same diameter as ball 95
A plurality of helical grooves 92a having a width are provided in a conformal arrangement.
(See FIG. 13). Gear 9 loosely fitted to helical groove shaft 92
4, a step 94a is provided on the inner diameter side.
The ball 9 has a depth equal to the diameter of the ball 95
The semicircular groove 94b into which half of the 5 can be fitted is a helical groove
The same number and equiangular arrangement are provided in parallel with the axis of 92a.
You. The balls 95 provided in the same number as the slots 94b are grooves.
The holes 94b and the helical groove 92a are simultaneously engaged. Helicopter
Between the spring receiver 99 provided on the cull groove shaft 92 and the annular plate 96.
The compression spring 97 urged between the ball springs 95
The escape from the slot 94b is prevented. This compression spring
The pressing force of 97 rotates on the gear 94 via the helical groove 92a.
A pressing force is generated in one direction, so that one of the gears 94 and 57
Has the effect of eliminating backlash in the
The backlash between the gear 6 and the gear 93 disappears, and the gear
The angle accuracy of the rotation transmission can be improved. The teeth
The wheel 93 is made of steel or plastic, and the gear 94 is made of steel or plastic.
Can be suitably made of a plastic material having a low coefficient of friction. Ma
In FIG. 13, reference numeral 92b denotes a snap ring. As described in the first embodiment, the teeth
When the relative angular displacement between the wheel 56 and the gear 57 occurs, this
The angular displacement is the relative angular displacement between gear 93 and gear 94
The gear 94 is helical via the ball 95
It moves axially along the groove 92a (in FIG. 11,
The lower side of the center line Y-Y of the helical groove shaft 92 is shown in FIG.
The torque is not transmitted to the angular displacement mechanism 60, and the gear 94
93 shows the position approaching, and the stepping torque is
Shows the position where the gear 94 is away from the gear 93
ing). The moving distance at this time is measured by the lever 86.
And the displacement amount is measured by a displacement detector (not shown)
In the embodiment, the angular displacement detector 85) shown in FIG.
Measure and use this as the signal of the stepping torque value to control the motor output.
Your function. [Fourth Embodiment] Drive Unit
Based on FIGS. 13, 14 and 15 shown as diagrams,
In one embodiment, the gear 56 of the angular displacement mechanism 60
Angular displacement detection mechanism 6 for detecting relative angular displacement of gear 57
Angular displacement detection mechanism 103 of another example that simplifies 1
Will be described. Other than the angular displacement detection mechanism according to this embodiment
The drive unit portion of the first embodiment
Angular displacement mechanism 60 has the same configuration
Therefore, the same reference numerals are given to the same parts,
The description of the minute is omitted. In the present embodiment,
Using parts of the same shape as in the third embodiment,
In this case, the numbers are the same. As shown in these figures, the gear 56
The gear 93 that meshes with the gear 93 that meshes with the gear 57 is the same.
The gear 93 has a meshing pitch diameter, and the gear 93 is made of steel or plastic.
Made of stick material and press-fit or bonded to helical groove shaft 92
Gear 98 is made of steel or low friction coefficient
Made of plastic material, can rotate and slide on helical groove shaft 92
Supported by Noh. Helical groove shaft 92 is at both ends
Reduction mechanism casing 101 and casing via a bearing
It is rotatably supported by the lid 102. Helical groove shaft 9
2, a plurality of helical grooves 92a having a constant width are arranged at an equal angle.
(See FIG. 13). On the inner diameter side of the gear 98
The protrusion 98a engaging with the helical groove 92a is
The grooves are provided in the same number and equiangularly as the grooves 92a. The gear 98 and the helical groove shaft 92
The pressing force of the compression spring 97 provided between the
A pressing force is generated on the gear 98 in the rotational direction via the rifal groove 92a.
Backlash between the gear 98 and the gear 57 in one direction.
The gear 56 and the gear 93
No backlash between the gears and the angle of rotation transmission between gears
Accuracy can be improved. The pressing force of the compression spring 97 is
Torque transmitted to gear 93 and gear 98 with minimum required
Plastic material teeth
Even a car can have sufficient durability. As described in the first embodiment, the teeth
When a relative angular displacement occurs between the wheel 56 and the gear 57, this
The angular displacement is the relative angular displacement between gear 93 and gear 98
The gear 98 is rotated along the helical groove 92a
(In FIG. 14, the helical groove shaft 92
The lower side of the center line Z-Z is connected to the angular displacement mechanism 60 shown in FIG.
Gear 98 is approaching gear 93 without transmitting torque
The upper side transmits the stepping torque, and the gear 98
The position away from the gear 93 is shown). This move
The distance is taken out by the lever 86, and the displacement amount is not shown.
Displacement detector (for example, as shown in FIG. 6 in the first embodiment)
85) and measure the stepping torque.
The value signal is a function of motor output control. [Fifth Embodiment] Drive Unit
Based on FIGS. 16 and 13 shown as diagrams,
Gear 56 and gear 57 of the angular displacement mechanism 60 in the form of
Simplifies the angular displacement detection mechanism that detects the relative angular displacement of
The configuration of another example of the angular displacement detection mechanism 110 will be described.
Drive unit other than the angular displacement detection mechanism according to the present embodiment
Is the same as in the first embodiment,
Since the angular displacement mechanism 60 has the same configuration,
The same reference numerals are given and the description of the overlapping portions will be omitted. Ma
In this embodiment, some of the third embodiments
Parts with the same shape are used.
And Note that the fourth gear 94 is viewed from the C direction.
Since the shape is the same as that of FIG. 12, the description is omitted. As shown in these figures, the gear 56
The gear 93 that meshes with the gear 93 that meshes with the gear 57 is the same.
The gear 93 has a meshing pitch diameter and the helical groove shaft 92
And the gear 94 is connected to the
It is rotatably and slidably supported by the cull shaft 92. Helicopter
The cull groove shaft 92 has a reduction mechanism cable at both ends via bearings.
Lancing 111 (in the unit of the first embodiment)
The reduction mechanism casing 41 is only the portion shown in FIG.
Shape) and casing lid 112 (first implementation)
The casing lid 52 in the unit of
Only the part that changed the shape)
ing. As shown in FIG.
Helical grooves 92a having the same width as the diameter of the
It is arranged and provided. Plays with helical groove shaft 92
A step 94a (see FIG. 12) is provided on the inner diameter side of the gear 94.
The depth of the step 94a is equal to the diameter of the ball 95.
Semi-circular groove into which half of the ball 95 can fit with a new depth
The hole 94b (see FIG. 12) is flat with the axis of the helical groove 92a.
The rows are provided with the same number of conformal arrangements. Same as slot 94b
Several balls 95 are provided with slots 94b and helical
It engages with the groove 92a at the same time. Prepared for helical groove shaft 92
Between the spring holder 99 and the annular plate 96
The compressed compression spring 97 allows the ball 95 to escape from the slot.
And prevent. The stepped shaft cylinder of the gear 94 has a ball bearing 1
07, and the outer diameter of the ball bearing 107 is
06. Bearing retaining ring 106 and casing 1
11, the compression spring 105 moves the gear 94 to the gear 93 side.
It is installed by urging in the pushing direction. Casing 111
A non-rotating shaft 108 is fixed in parallel with the helical groove shaft 92.
The rotation stop shaft 108 is
The bearing retaining ring 106 engages with the hole formed in the outer
The axial movement of the cull shaft 92 is possible and the rotation direction is restricted.
Has the effect of The pressing force of the compression springs 97 and 105 is
A pressing force is generated in the rotation direction on the gear 94 via the rifal groove 92a.
The gear 94 and the gear 57 in one direction.
And has the effect of eliminating the
There is no backlash between the gears, and the angle of rotation transmission between gears
Accuracy can be improved. As described in the first embodiment, the teeth
When a relative angular displacement occurs between the wheel 56 and the gear 57, this
The angular displacement is the relative angular displacement between gear 93 and gear 94
The gear 94 is helical via the ball 95
It moves in the axial direction along the groove 92a (in FIG. 16,
The lower side of the center line EE of the helical groove shaft 92 is shown in FIG.
The torque is not transmitted to the angular displacement mechanism 60, and the gear 94
93 shows the position approaching, and the upper side shows the transmission of the stepping torque.
Instead, the position where the gear 94 is separated from the gear 93 is shown.
There). This moving distance is taken out by the lever 86,
The displacement amount is represented by a displacement detector (not shown) (for example, the first embodiment
At a potentiometer 85) shown in FIG.
This is used as the signal of the stepping torque value as the motor output control function.
And In the present embodiment, when the torque is detected
When taking out the moving amount of the gear 94, a lever for torque detection
Since the part receiving the pressing force of 86 does not rotate, relative sliding
No friction, especially at the contact area between lever 86 and gear 94
Even without abrasion treatment, there is no need to worry about abrasion,
The accuracy of torque detection is improved. [Sixth Embodiment] Part of the drive unit
FIG. 17 shown as a diagram, FIG.
FIG. 18 showing the gear 4 of FIG.
Based on the extracted and shown perspective view of FIG.
The gear 56 and the gear 5 of the angular displacement mechanism 60 in the embodiment
Simplifies the angular displacement detection mechanism that detects the relative angular displacement of 7
Of the configuration of another example of the angular displacement detection mechanism 120
I will tell. Drives other than the angular displacement detection mechanism 120 according to the present embodiment
The moving unit is the same as in the first embodiment.
And the angular displacement mechanism 60 has the same configuration.
Therefore, the same reference numerals are given to the same portions, and
Description is omitted. Also, in this embodiment,
Or using the same shape parts as in the fourth embodiment,
In this case, the numbers are the same. As shown in these figures, the gear 56
The gear 93 that meshes with the gear 93 and the gear 123 (other
(Corresponds to the gear 94 in the embodiment)
The gear 93 has a pitch diameter, and the gear 93 is made of steel or plastic.
The helical groove shaft 121 (made of a material,
(Corresponding to cull shaft 92) by press-fitting or bonding
The gear 123 is a plastic material with a low coefficient of friction
And is supported by the helical groove shaft 121 so as to rotate and slide.
I have. The helical groove shaft 121 is provided with bearings at both ends.
And the speed reduction mechanism casing 111 (in the first embodiment,
Casing 41) and casing lid 112 (first
(In the embodiment, corresponds to the casing lid 52).
Freely supported. The helical groove shaft 121 has a plurality of
Helical grooves 121a having a constant width are provided in an equiangular arrangement.
(The helical groove shaft 121 is the helical groove shaft shown in FIG. 13)
All except for the snap ring groove 92b of the groove shaft 92
The same shape). As shown in FIG.
On the radial side, a protrusion 123 that engages with the helical groove 121a is provided.
a is provided in the same number as the helical groove 121a.
I have. The ball bearing 1 is mounted on the stepped cylindrical portion of the gear 123.
07 and the outer diameter of the ball bearing 107 is the bearing holding ring 1
06. Bearing retaining ring 106 and casing 1
11, the compression spring 105 causes the gear 123 to
It is installed by biasing in the direction of pushing to the side. Casing 11
1 has a non-rotating shaft 108 fixed in parallel with the helical shaft 121
The non-rotating shaft 108 is attached to the bearing holding ring 106.
Engages with the hole formed in the outer edge of
The helical shaft 121 can be moved in the axial direction,
It has the effect of restraining. The compression spring 105 has a pressing force of a helical groove 121.
Since a pressing force is generated in the rotation direction on the gear 123 via a.
No backlash in one direction between gear 123 and gear 57
This has the effect of a comb, and at the same time, the backlash between the gears 56 and 93.
Eliminates crashes and improves the angular accuracy of rotation transmission between gears
Can be better. The pressing force of the compression spring 105 is
The torque transmitted to the gear 93 and the gear 123 is a small limit.
By making it small, the gear made of plastic material
Can also have sufficient durability. As described in the first embodiment, the teeth
When a relative angular displacement occurs between the wheel 56 and the gear 57, this
The angular displacement is the relative angular displacement between gear 93 and gear 123
Gear 123 moves along the helical groove 121a.
(In FIG. 17, the helical groove axis
The lower part of the center line FF of 121 is an angular displacement machine shown in FIG.
The torque is not transmitted to the frame 60, and the gear 123 is close to the gear 93.
The upper position indicates the stepping torque, and the upper
The position where the car 123 is away from the gear 93 is shown.
). This moving distance is taken out by the lever 86 and changed.
The displacement is measured by a displacement detector (not shown) (for example, in the first embodiment).
In this case, measure with the potentiometer 85) shown in FIG.
The motor output control function and
I do. Also in the present embodiment, when the torque is detected
When taking out the amount of movement of the gear 123, the torque detection lever
Since the part receiving the pressing force of the bar 86 does not rotate,
There is no slippage and the contact part between lever 86 and gear 123
No need to worry about wear
The durability and the accuracy of torque detection are improved. [Seventh Embodiment] Driving Unit Part
19 shown as a diagram and the serration axis 1 of FIG.
31 according to the first embodiment based on the perspective view 20 of FIG.
Relative angular displacement of gear 56 and gear 57 of angular displacement mechanism 60
Another example of a simplified angle displacement detection mechanism for detecting the angle
The configuration of the angular displacement detection mechanism 130 will be described. In this form
Drive unit other than the angular displacement detection mechanism 130
Is the same as in the first embodiment,
Since the angular displacement mechanism 60 has the same configuration,
Minutes are given the same reference numerals, and descriptions of overlapping parts are omitted.
You. In the present embodiment, some fourth and fourth
Parts with the same shape as in the sixth embodiment are used.
In this case, the numbers are the same. As shown in FIG. 19, the gear meshes with the gear 56.
The gear 93 meshes with the gear 93 (the other embodiment).
Is equivalent to the gear 94 or the gear 123).
The gear 93 is made of steel or
Serration shaft 131 (made of other material)
Press fit into the helical groove shafts 92 and 121)
Alternatively, the gear 133 is made of steel material and is integrally joined by bonding or the like.
Serration shaft (made of plastic material with low coefficient of friction)
131 is rotatably and slidably supported. Serration
The shaft 131 is provided with a reduction mechanism cable at both ends via bearings.
Thing 111 (in the first embodiment,
Equivalent) and the casing lid 112 (in the first embodiment)
Is rotatably supported by the casing lid 52).
ing. The serration axis 131 is as shown in FIG.
Helical serration with an appropriate angle to the axis
Has been processed. On the inner diameter side of the gear 133, a helicopter
Inner helical cell engaging with calceration 131a
133a is provided at a part of the shaft inner diameter,
Good bush 132 (for example, oil-impregnated sintered alloy, etc.)
) Is press-fitted. The ball bearing 107 is provided on the shaft cylinder of the gear 133.
And the outside diameter of the ball bearing 107 is
06 is fitted. Bearing retaining ring 106 and casing 1
Between the compression gear 105 and the gear 93
It is installed by biasing in the direction of pushing to the side. Casing 11
1 has a non-rotating shaft 108 parallel to the serration shaft 131.
The non-rotating shaft 108 is fixed to the bearing holding ring 1.
06 is engaged with the hole formed in the outer edge of the bearing holding ring 106.
Can move in the axial direction of the serration shaft 131 and rotate
It has the effect of restricting the direction. The pressing force of the compression spring 105 is helical serration.
Through the inner helical serration 133a
As a result, a pressing force is generated on the gear 133 in the rotational direction.
Effect of eliminating backlash in one direction between gear 3 and gear 57
At the same time, the backlash between the gear 56 and the gear 93
And improve the angular accuracy of rotation transmission between gears.
be able to. As described in the first embodiment, the teeth
When a relative angular displacement occurs between the wheel 56 and the gear 57, this
The angular displacement is the relative angular displacement between gear 93 and gear 133
Gear 133 is helical serration 1
It moves in the axial direction along 31a (see FIG.
The lower side of the center line HH of the ration shaft 131 is shown in FIG.
The torque is not transmitted to the angular displacement mechanism 60, and the gear 133
The position near the gear 93 is shown.
Is transmitted, and the position where the gear 133 is separated from the gear 93 is
Shown). This moving distance is measured by the lever 86.
And a displacement detector (not shown in the drawings)
In the embodiment, the potentiometer 85) shown in FIG.
Measure and use this as the signal of the stepping torque value to control the motor output
Function. The gear 133 is a plastic material having a low coefficient of friction.
In this case, the bush 132 may be
The part corresponding to this bush 132 is also unnecessary
And are integrally formed. In this case, the pressing force of the compression spring 105
Is transmitted to the gear 93 and the gear 133
Plastic material by reducing torque
Even the gears made can be made sufficiently durable. Also in the present embodiment, when the torque is detected
When extracting the amount of movement of the gear 133, the torque detection lever
Since the part receiving the pressing force of -86 does not rotate, the relative
No slippage, especially at the contact between the lever 86 and the gear 133
No need to worry about abrasion
And the accuracy of torque detection is improved. Serration axis
The gear 133 is fixed on the
The helical gear 133
Serration 133a and bearing (bush 132 or
Plastic bearing with low friction coefficient)
The gear 133 eliminates the unbalanced rotation and the torque detection accuracy
Can be maintained. [Eighth Embodiment] Drive Unit
According to FIG. 21 shown as a diagram and the KK section of FIG.
Based on FIG. 22 showing the lever 144 and its surroundings,
Gear 56 of the angle displacement mechanism 60 in the first embodiment
Displacement detecting mechanism for detecting the relative angular displacement of the gear and the gear 57
Of the angular displacement detection mechanism 140, which is a further example of
I will tell. Drives other than the angular displacement detection mechanism 140 according to the present embodiment
The moving unit is the same as in the first embodiment.
And the angular displacement mechanism 60 has the same configuration.
Therefore, the same reference numerals are given to the same portions, and
Description is omitted. Also, in this embodiment,
Or using the parts of the same shape and function as the seventh embodiment
In this case, the numbers are the same. As shown in FIG. 21, the gear meshes with the gear 56.
The gear 93 and the gear 133 meshing with the gear 57 have the same mesh.
The gear 93 has a meshing pitch diameter, and the gear 93 is made of steel or plus.
Pressing or contacting the serration shaft 131
The gear 133 is made of steel (or low friction).
Serration shaft 131 made of plastic material with friction coefficient)
It is rotatably and slidably supported. Serration axis 1
31 is a reduction mechanism casing via bearings at both ends
141 (corresponding to the casing 41 in the first embodiment)
) And the casing lid 142 (in the first embodiment, the case
(Corresponding to the shing lid 52).
You. Serration axis 131 has an appropriate angle to the axis
Helical serration 131a with
(See FIG. 20). A helical gear is provided on the inner diameter side of the gear 133.
Inner helical serration engaged with serration 131a
133a is provided at a part of the shaft inner diameter,
Good bush 132 (eg, oil-impregnated sintered alloy, etc.)
Is press-fitted. Reference numeral 107 denotes a bob which is externally fitted to the shaft cylinder of the gear 133.
144 is a side surface of the outer ring of the ball bearing 107.
107a is a lever lever that abuts against and pushes it in the axial direction.
You. The lever 144 has a ring shape.
To a metal pad 143 fixed to the casing 141 on the upper side.
The protrusion 144a having the fulcrum to be contacted is
The projecting plate portion 144c forming the point of action of the bar 144 is
Outer ring side surface 107 of ball bearing 107
and a projection 144b which comes into contact with a and becomes a power point. This
The head of the gold 143 contacts the lever lever protrusion 144a.
Groove so that the protrusion 144a does not shift laterally when
It has become. Gear 133 is on serration shaft 131
When moving the ball bearing fitted to the gear 133
107 outer ring presses lever lever projection 144b (power point)
Then, lever lever lever 144a is used as a fulcrum.
Double the protruding plate portion 144c (action point)
You. As shown in FIG. 22, from the fulcrum of the lever 144
The distance to the force point is a, and the distance from the fulcrum to the point of application is b.
Then, assuming that the moving amount of the ball bearing 107 is e,
The working distance f is f = e × b / a. 145 is a circuit fixed to the casing 141.
This is a locking pin, and this locking pin 145
The lever 144 engages with the hole 144d of the protruding plate, and the lever 144
It is prevented from rotating together with the roller bearing 107. Compression
146 uses the non-rotating pin 145 as a guide shaft.
Between the lever 141 and the protrusion plate 144c of the lever.
The pressing force of the compression spring 146 is applied to the lever 1
Helical serration 131a and inner helicopter via 44
Direction of rotation to gear 133 via luceration 133a
Generates a pressing force in one direction of the gear 133 and the gear 57.
Of the gear 56
Backlash between gears 93 is also eliminated, and rotation between gears
The angular accuracy of rolling transmission can be improved. The action point of the projecting plate portion 144c of the lever lever
Displacement is converted to angular displacement via detection lever 147
And displacement detection attached to the outside of the casing 141
It is measured by the container 148. Detection axis of displacement detector 148
Is equipped with a torsion spring, and the detection lever 147 is always
The lever protruding plate portion 144c is pressed to act to
Play is prevented from occurring at the outlet. As described in the first embodiment, the foot
A stepping torque is generated, and a phase between the gear 56 and the gear 57 is generated.
If an angular displacement occurs, this angular displacement is
Since it is reflected in the relative angular displacement with the wheel 133, the gear 1
33 is in the axial direction along the helical serration 131a
Move (in FIG. 21, inside the serration axis 131)
The lower side of the cord JJ is connected to the angular displacement mechanism 60 shown in FIG.
The gear 133 is approaching the gear 93 without Luku being transmitted.
The position indicates the step torque transmitted from the upper side, and the gear 133
Indicates a position away from the gear 93). This transfer
Double the moving distance e to the distance f by lever lever 144
The distance f is detected through the detection lever 147 for displacement detection.
Measure with the output unit 148 and use this as the signal of the stepping torque value.
It is a function of motor output control. The gear 133 is made of a plastic material having a low coefficient of friction.
In this case, the bush 132 may be
The part corresponding to this bush 132 is also unnecessary
And are integrally formed. Pressure pushing lever lever 144
The urging force of the compression spring 146 is minimized, and the gear 93 and the teeth
To reduce the torque transmitted to the vehicle 133
Make plastic gears more durable
Can be In this embodiment, when torque is detected
When taking out the movement amount of the gear 133, the gear 133 rotates
The projection 144b of the lever 144 is
Since the bearing 14 is in contact with the outer ring of the
4b and the outer ring of the ball bearing 107 cause relative slippage.
Even if it flies, contact between lever lever 144 and gear 133
There is no need to worry about wear even if the part is not especially abrasion-resistant,
Durability is sufficiently maintained. The bush 132 is
The gear 133 is securely supported on the rotation shaft 131.
Helical serration 13 of the gear 133
3a and a bearing (a bush 132 or a plastic with a low friction coefficient)
The durability of the gear 133 is improved.
Rotation is lost. In addition to this, the ball bearing 10
7 to the displacement detector from the displacement detector 148
At the same time, the displacement is doubled and transmitted to the detector 148.
Control signal while maintaining torque detection accuracy.
Signal processing, and confirms signal processing in the controller.
Really easy. [Ninth Embodiment] FIG. 23 shows a ninth embodiment of the present invention.
Part showing the angular displacement detection mechanism according to the ninth embodiment
It is sectional drawing. Also, the center of the serration axis 131 in FIG.
The lower side of the line LL is connected to the angular displacement mechanism 60 shown in FIG.
Gear 133 is approaching gear 93 without transmission
The upper side transmits the stepping torque, and the gear 133
The position away from the gear 93 is shown. As shown in FIG. 23, the ninth embodiment
The difference between the state and the eighth embodiment is that the ball bearing 1
Only that the bearing presser ring 151 is externally fitted to the outer ring
All other configurations are the same as those of the above-described eighth embodiment.
Is the same. Therefore, the description will not be
And omit the rest. Ball bearing externally fitted on the shaft of the gear 133
A bearing retaining ring 151 is fitted to the outer ring 107. Ke
Axle to the detent pin 145 fixed to the
The hole formed in the outer edge of the receiving ring 151 engages and
To move the ring 151 in the axial direction of the serration shaft 131
It is possible and has the effect of restricting the rotation direction. Lever lever
-144 also engages with the detent pin 145,
When the bearing 107 moves, it is shown by a two-dot chain line in FIG.
Thus, the lever 144 is better than the bearing ring 151
Move fast in the same direction, so don't worry about
No. In this embodiment, when torque is detected
When the movement amount of the gear 133 is taken out by the lever 144,
The bearing retainer ring 151 and detent pin 145
Since the rotation of the outer ring of the ball bearing 107 is restricted,
Phase of lever lever projection 144b and bearing retaining ring 151
There is no slippage, and the durability of this displacement detection path is
It is even better than the eighth embodiment described above. The present invention has been described in detail with the above embodiments.
According to the present invention, the deceleration directly connected to the output shaft of the high-speed electric motor
Vibration and noise due to the use of planetary roller reducers
Few. Also, the planetary roller shaft key of this planetary roller reducer
The pinion is formed integrally with the output shaft of the
Configure a two-stage gear reduction mechanism so that a speed ratio can be obtained.
Thus, the motor and the two types of speed reduction mechanisms are integrated.
Is housed in the casing of the unit at the position of the pedal hub
That project around the unit
And compact, with good weight distribution to wheels
I have. The planet with motor as an auxiliary power of the bicycle
When using a roller reducer, the output chain sprocket
Because it can be placed in the same axial position as a normal bicycle,
Sprockets can be left in their normal positions. The relative displacement mechanism of the gear by the stepping torque is as follows.
When stepping torque value exceeds a certain value while riding a bicycle,
Mechanical structure such that the electric motor starts auxiliary driving.
So that the control system of the electric motor is simple
Become. In particular, items 8) to 11) of the problem solving means
The gear relative displacement detection mechanism reduces the number of parts and
, The manufacturing cost can be reduced. Also, section
In the inventions of the items 12) and 13) of the problem solving means, the torque detection
Relative to the part that receives the pressing force of the lever
Eliminates slippage, eliminates wear in this area, and is durable
And the accuracy of torque detection can be improved. As described in the paragraphs 14) and 15) of the problem solving means.
The relative displacement detection mechanism of the solid gear is mounted on the serration axis.
The bushing to support the displacement detection gear
The durability of the serrations and bearings inside the gears
Better performance and eliminates biased rotation of the displacement detection gear
In addition, torque detection accuracy can be maintained. As described in the paragraphs 16) and 17) of the problem solving means.
The relative displacement detection mechanism of the solid gear is mounted on the serration axis.
The bushing to support the displacement detection gear
Good durability of inner serrations and bearings of gears
At the same time as eliminating the unbalanced rotation of the displacement detection gear.
Since the position is doubled and transmitted to the detector,
The movement amount of the piece increases, and the torque detection accuracy is maintained.
Can generate a large control signal,
Signal processing easily and reliably.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a bicycle to which an electric bicycle drive unit according to an embodiment of the present invention is attached. FIG. 2 is a side sectional view of the electric bicycle drive unit according to the first embodiment of the present invention. FIG. 3 is a partial view showing an angular displacement mechanism accompanying a stepping torque in FIG. 2; FIG. 4 is a sectional view taken along line AA of FIG. 3; FIG. 5 is a perspective view showing a roller portion of an angular displacement detection mechanism for extracting an angular displacement associated with a stepping torque in FIG. FIG. 6 is a partial view of the angular displacement detection mechanism in FIG. FIG. 7 is a sectional view taken along the line BB of FIG. 2; 8 is a block diagram showing a power transmission and control system of a bicycle using the electric bicycle drive unit shown in FIG. 2; FIG. 9 is a side sectional view of an electric bicycle drive unit according to a second embodiment of the present invention. 10 is a block diagram showing a power transmission and control system of the bicycle using the electric bicycle drive unit shown in FIG. 9; FIG. 11 is a partial cross-sectional view illustrating an angular displacement detection mechanism according to a third embodiment of the present invention. FIG. 12 is a view taken along line CC of FIG. 11; FIG. 13 is a perspective view of the helical groove shaft 92 of FIG. FIG. 14 is a partial cross-sectional view illustrating an angular displacement detection mechanism according to a fourth embodiment of the present invention. FIG. 15 is a view taken along the line DD in FIG. 14; FIG. 16 is a partial sectional view showing an angular displacement detection mechanism according to a fifth embodiment of the present invention. FIG. 17 is a partial cross-sectional view illustrating an angular displacement detection mechanism according to a sixth embodiment of the present invention. 18 is a front view of the fourth gear as viewed from the direction of arrow G in FIG. FIG. 19 is a partial cross-sectional view illustrating an angular displacement detection mechanism according to a seventh embodiment of the present invention. 20 is a perspective view of the serration shaft 131 of FIG. FIG. 21 is a partial cross-sectional view showing an angular displacement detection mechanism according to an eighth embodiment of the present invention. FIG. 22 is a diagram showing the lever and its periphery, taken along the line KK in FIG. 21; FIG. 23 is a partial sectional view showing an angular displacement detection mechanism according to a ninth embodiment of the present invention. FIG. 24 is a side view showing an outline of a conventional bicycle power mechanism. FIG. 25 is a plan view of the power mechanism of the bicycle of FIG. 24; [Description of Signs] 4 Drive-side chain sprocket 5 Chain 16 Bicycle with auxiliary power 17 Rear wheel 30 Electric bicycle drive unit (first embodiment) 31 Motor 38 Motor casing 39 Crankshaft 40 Planetary roller reducer 41 Reduction mechanism Casing 50 Two-stage reduction mechanism 55 One-way clutch 56 First gear 57 Second gear 58 One-way clutch 59 Compression spring 60 Angular displacement mechanism 61 Angular displacement detection mechanism 62 Gear 63 Gears 63a, 64a Concave mountain cam 65 Roller 66 Compression Spring 70 Electric bicycle drive unit (second embodiment) 71 First gear 72 Second gear 73 Gear 81 Angular displacement detection mechanism (Third embodiment) 85 Angular displacement detector 89 Speed sensor 91 Angle Displacement detection mechanism 92 Helical groove shaft 93 Gear 94 Gear 98 Gear 103 Angular displacement detection mechanism ( Fourth Embodiment 105 Compression Spring 106 Bearing Holding Ring 107 Ball Bearing 108 Detent Lock 110 Angular Displacement Detecting Mechanism 120 Angular Displacement Detecting Mechanism 121 Helical Groove Shaft 121a Helical Groove 123 Gear 123a Projection 131 Serration Shaft 131a Helical Serration 132 Bush 133 Gear 133a Internal serration 140 Angle displacement detection mechanism 144 Lever lever 144a Projection 144b Projection 144c Projection plate 144d Hole 145 Detent pin 146 Compression spring 147 Detection lever 148 Displacement detector 150 Angle displacement detection mechanism 151 Bearing holding plate

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Masaru Ota             Aichi Prefecture Nagoya City Nakamura-ku Iwazuka-cho character highway 1               Mitsubishi Heavy Industries, Ltd.Nagoya Equipment Works (72) Inventor Masashi Hirabayashi             Aichi Prefecture Nagoya City Nakamura-ku Iwazuka-cho character highway 1               Nagoya Research Laboratory, Mitsubishi Heavy Industries, Ltd.

Claims (1)

Claims: 1. A motor having an output shaft concentric with a crankshaft of a foot pedal, a planetary roller speed reducer having an output shaft of the motor as a sun roller, and a speed reduction of the planetary roller speed reducer. A two-stage gear reducer for further reducing the shaft rotation, a first one-way clutch interposed in a power transmission path of the two-stage gear reducer, and a concentric final gear meshing with the output shaft of the two-stage gear reducer A drive-side chain sprocket having a first gear of a step; and a second one-way clutch supported on a crankshaft of a foot pedal via a bearing and transmitting rotation of the crankshaft to the drive-side chain sprocket. A second gear having the same meshing pitch diameter as the first gear, an elastic body provided on the first gear, and a projecting member of the second gear engaged with the elastic body; Elastic torque magnitude It has an angular displacement mechanism expressed by the angular displacement associated with the deformation of the motor, and an angular displacement detecting mechanism that detects the angular displacement generated in the angular displacement mechanism. The output torque of the electric drive is adjusted according to the magnitude of the stepping torque. A drive unit for an electric bicycle, wherein the drive unit is configured to be controlled. 2. The electric bicycle drive unit according to claim 1, wherein the angular displacement mechanism for detecting the angular displacement according to the magnitude of the stepping torque is divided into a plurality of equal parts on the side surface of the first gear. , A plurality of compression springs housed in the elongated holes, and a projecting member of the second gear engaged with the compression springs in only one direction of rotation. A drive unit for an electric bicycle, wherein the compression spring is shortened in proportion to a stepping torque to represent a relative angular displacement between the two gears. 3. The driving unit for an electric bicycle according to claim 2, wherein the stepping torque is stored in a circumferentially long hole on a side surface of a first gear of the angular displacement mechanism for converting the stepping torque into an angular displacement. An electric bicycle characterized in that an initial pressure is applied to a plurality of compression springs, and a relative angular displacement between the two gears is not performed while the stepping torque is small, so as to limit the energizing range of the motor. Drive unit. 4. The electric bicycle drive unit according to claim 2, wherein the angular displacement detection mechanism for detecting a relative angular displacement between the first gear and the second gear includes the angular displacement detection mechanism. A pair of gears meshing with the first and second gears and rotating coaxially, and a concave chevron cam fixed to each of the side surfaces of the two gears and equally distributed to a plurality of annular side surfaces so as to face each other. A compression spring biased in a direction to push the concave cams, and a plurality of rollers sandwiched between parallelograms formed by the cam surfaces of both concave cams. When the relative angular displacement of the two gears occurs, the concave chevron cams facing each other are displaced and the roller rides on the cams, and the moving distance when the two gears are separated from each other in the axial direction is determined by the sliding plate and the lever. Take out and the displacement amount at this time The electric bicycle drive unit is characterized in that a motor output control signal is obtained by measuring the motor output control signal with a displacement detector. 5. A motor having an output shaft concentric with a crankshaft of a foot pedal, a planetary roller speed reducer having an output shaft of the motor as a sun roller, and further reducing the rotation of the speed reduction shaft of the planetary roller speed reducer. A two-stage gear reducer, a first one-way clutch interposed in a power transmission path of the two-stage gear reducer, and a concentric last stage first gear engaged with the output shaft of the two-stage gear reducer And a second one-way clutch supported on a crankshaft of a foot pedal via a bearing and transmitting rotation of the crankshaft to the drive-side chain sprocket, the first gear having: A second gear having the same meshing pitch diameter, a third gear meshing with the first gear, and a fourth gear meshing with the second gear are coaxially arranged, and the stepping torque is reduced by the second gear. Via a pair of gears And a torque detecting mechanism that acts so that a displacement proportional to the transmission torque is generated in the axial direction by the transmission torque between the third gear and the fourth gear, and the magnitude of the stepping torque A drive unit for an electric bicycle, characterized in that the output torque of the electric drive is controlled in accordance with (1). 6. The electric bicycle drive unit according to claim 5, which has a function of generating a displacement proportional to the transmission torque in the axial direction by the transmission torque between the third gear and the fourth gear. The torque detecting mechanism comprises a concave chevron cam fixed to each of the side surfaces of the two gears and distributed equally to a plurality of annular side surfaces and formed opposite to each other. And a plurality of rollers sandwiched in a parallelogram formed by the cam surfaces of both concave chevron cams, and when a relative angular displacement of both gears occurs due to stepping torque, When the concave cams facing each other are displaced and the roller rides on the cams, the moving distance when the two gears are separated from each other in the axial direction is taken out by the slide plate and the lever, and the displacement at this time is measured by a displacement detector. Motor output control A drive unit for an electric bicycle, wherein the drive unit is configured to be a signal. 7. A drive unit for an electric bicycle according to claim 6, wherein an initial pressure is applied to a compression spring biased in a direction to push the pair of concave cams of the stepping torque detecting mechanism toward each other. A drive unit for an electric bicycle, wherein a relative angular displacement between the two gears is not generated while the stepping torque is small, so as to limit the energizing range of the motor. 8. The drive unit for an electric bicycle according to claim 1, wherein the angular displacement detecting mechanism for detecting a relative angular displacement between the first gear and the second gear has opposite ends. A helical groove shaft rotatably supported by bearings and having a plurality of helical grooves arranged in a cylindrical shaft portion between the bearings; and a third helical groove shaft engaged with the first gear and fixed to the helical groove shaft.
And the second gear is meshed with the second gear so as to freely slide in the rotational direction and the axial direction on the helical groove shaft, and the helical groove of the helical groove shaft is located deep inside the stepped portion of the mating inner cylinder. A fourth gear having a same number of dead-end grooves parallel to the axis, and a ball having the same number as the number of helical grooves simultaneously engaging with the helical groove of the helical groove shaft and the dead-end groove of the fourth gear; A ball holding means for holding the fourth gear in the dead end groove of the fourth gear, an urging means for urging the fourth gear in a direction to push the fourth gear toward the third gear, and a distance by which the fourth gear moves in the axial direction. A drive unit for an electric bicycle, comprising: detection means for detecting and outputting a motor output control signal. 9. The ball holding means, the urging means and the detecting means according to claim 8 are: an annular plate fitted on the step of the inner cylinder of the fourth gear; and the annular plate and the helical groove. A compression spring installed between seat plates fixedly mounted on the shaft and biased in a direction to push the fourth gear toward the third gear; When a relative angular displacement occurs between the first gear and the second gear, the fourth gear deviates in angle with respect to the third gear, so that the fourth gear pushes against a ball moving along the helical groove. The distance moved in the axial direction is taken out by a lever in contact with the side surface of the fourth gear, and the amount of displacement at this time is measured by a displacement detector to provide a motor output control signal. Drive unit for an electric bicycle. 10. The electric bicycle drive unit according to claim 1, wherein the angular displacement detecting mechanism for detecting a relative angular displacement between the first gear and the second gear has both ends. A helical groove shaft rotatably supported by bearings and having a plurality of helical grooves arranged in a cylindrical shaft portion between the bearings; a third gear meshed with the first gear and fixed to the helical groove shaft; A projection having the same number of the same helical angles as the second internal gear, which is slidably engaged with the helical groove shaft in both the rotational direction and the axial direction and engages with the helical groove of the helical groove shaft. A fourth gear in which a portion is disposed, and when a relative angular displacement occurs between the first gear and the second gear according to the magnitude of the stepping torque, the fourth gear By shifting the angle with respect to the third gear, the fourth gear Electric bicycle drive unit, characterized in that detecting the distance traveled along the helical groove includes a detector for a motor output control signal. 11. The detecting means according to claim 10, wherein a distance that the fourth gear moves along the helical groove is taken out by a lever in contact with a side surface of the fourth gear, and a displacement amount at this time is obtained. A drive unit for an electric bicycle, wherein the drive unit is configured to be a motor output control signal measured by a displacement detector. 12. The angular displacement detection mechanism for detecting a relative angular displacement between the first gear and the second gear of the electric bicycle drive unit according to claim 8, wherein the fourth gear has a step. A ball bearing externally fitted to the shaft cylinder portion, a bearing press ring externally fitted to the ball bearing, and a biasing member disposed between the bearing press ring and the casing for urging the fourth gear toward the third gear. A compression spring and a non-rotating shaft of the bearing presser ring fixed to the casing in parallel with the helical shaft. The first gear is connected to the first gear according to the magnitude of the stepping torque. When a relative angular displacement occurs in the second gear, the fourth gear is displaced in angle with respect to the third gear, so that the fourth gear is pushed by a ball moving along the helical groove and is axially displaced. Travel distance of the bearing through the ball bearing and the bearing retaining ring. Removed by lever on the side surface of the ring in contact with the electric bicycle drive unit, characterized by being configured such that the motor output control signal as measured by the displacement detecting meter displacement amount at this time. 13. The angular displacement detection mechanism for detecting a relative angular displacement between the first gear and the second gear of the electric bicycle drive unit according to claim 10;
A ball bearing externally fitted to the stepped shaft cylinder portion of the gear, a bearing press ring externally fitted to the ball bearing, and a fourth gear disposed between the bearing press ring and the casing, and a fourth gear disposed on the third gear side. A compression spring biased in the pushing direction and a detent shaft of the bearing presser ring fixed to the casing in parallel with the helical shaft are additionally provided. When a relative angular displacement occurs between the first gear and the second gear, the angle at which the fourth gear shifts with respect to the third gear shifts the distance that the fourth gear moves along the helical groove. Through the ball bearing and the bearing retaining ring, taken out by a lever that is in contact with the side surface of the bearing retaining ring, and measuring the amount of displacement at this time with a displacement detector to obtain a motor output control signal. Characteristic drive unit for electric bicycle. 14. The electric bicycle drive unit according to claim 1, wherein the angular displacement detecting mechanism for detecting a relative angular displacement between the first gear and the second gear has both ends. A serration shaft rotatably supported by bearings and having a cylindrical shaft portion and a helical serration portion between the bearings; a third gear engaged with the first gear and fixed to the serration shaft; A bush is inserted into the inner cylinder so as to be slidably engaged with the serration shaft in both the rotational direction and the axial direction while meshing with the gears, and the same helical angle of engagement with the helical serration of the serration shaft in the same cylinder. A fourth gear having internal serrations, a ball bearing externally fitted to the stepped shaft cylindrical portion of the fourth gear, a bearing press ring externally fitted to the ball bearing, and a bearing press ring and the casing. A compression spring installed between the compression springs and biasing the fourth gear toward the third gear; and a detent shaft for the bearing retaining ring fixed to the casing in parallel with the helical shaft. When a relative angular displacement occurs between the first gear and the second gear in accordance with the magnitude of the stepping torque, the angle of the fourth gear shifts with respect to the third gear. The distance that the fourth gear moves along the helical serration is taken out by the lever that is in contact with the side surface of the bearing press ring via the ball bearing and the bearing press ring, and the displacement amount at this time is measured by a displacement detector. A drive unit for an electric bicycle, characterized in that the drive unit is configured to be used as a motor output control signal as measured by: 15. The angular displacement detecting mechanism for detecting a relative angular displacement between the first gear and the second gear of the electric bicycle drive unit according to claim 14, wherein
Instead of the fourth gear internally fitted with a bush that is slidably engaged with the serration shaft while meshing with the first gear, the second serration shaft can be slid in both the rotational direction and the axial direction while meshing with the second gear. A drive unit for an electric bicycle, wherein a fourth gear having a low friction coefficient having an inner serration engaged with the helical serration of the serration shaft is incorporated in a part of the same inner cylinder. 16. The electric bicycle drive unit according to claim 1, wherein the angular displacement detection mechanism for detecting a relative angular displacement between the first gear and the second gear has both ends. A serration shaft rotatably supported by bearings and having a cylindrical shaft portion and a helical serration portion between the bearings; a third gear engaged with the first gear and fixed to the serration shaft; A bush made of a low-friction material is fitted into the inner cylinder so that the bush is slidably engaged with the serration shaft in both the rotational direction and the axial direction while meshing with the gears, and engages with the helical serration of the serration shaft in the same cylinder. A fourth gear having an inner serration of the same helical angle, a ball bearing externally fitted to the stepped cylindrical portion of the fourth gear, and a casing provided at one protruding end provided on the ring-shaped plate. There is a fulcrum that abuts on both sides of the ring, and a projection that abuts on the side surface of the outer ring of the ball bearing of the fourth gear shaft as a point of force is provided. A lever lever, a detent pin parallel to the serration axis, which is fixed to the casing and is inserted into a hole provided in an action point plate portion of the lever lever,
A compression spring biasing the lever lever to push the ball bearing of the fourth gear shaft via a projection serving as a point of force, and a displacement detector that converts the moving distance of the point of action of the lever lever into an angular displacement to take out. When a relative angular displacement occurs between the first gear and the second gear according to the magnitude of the stepping torque, the angle of the fourth gear with respect to the third gear is changed. By shifting, the distance that the fourth gear moves along the helical serration is doubled by the lever that is in contact with the outer ring side surface of the ball bearing of the fourth gear shaft, and the displacement of the point of action of the lever is increased. A drive unit for an electric bicycle, wherein the drive unit is taken out by a displacement detector and the detected value is used as a motor output control signal. 17. The angular displacement detection mechanism for detecting a relative angular displacement between the first gear and the second gear of the electric bicycle drive unit according to claim 16, wherein
A bearing presser ring whose rotation direction is restrained by a detent pin fixed to the casing and externally fitted to the ball bearing of the stepped shaft cylinder portion of the gear is additionally provided, and the ball bearing is inserted through the bearing presser ring. A drive unit for an electric bicycle, wherein the protrusions on both sides of the ring portion of the lever are brought into contact with the side surface of the outer ring of the electric bicycle.