JPH08295284A - Bicycle with auxiliary power assist unit - Google Patents

Abstract

PURPOSE: To facilitate the manufacturing of an auxiliary power assist unit by reducing the extent of pedal operating power in time of man power traveling, and simultaneously making a pedal operating power interrupting means for an electric motor and a reversing means of a crankshaft so as to be installed without expanding the width of this auxiliary power assist unit, besides reducing the number of types of parts. CONSTITUTION: A one-way clutch 88 or a pedal operating power interrupting means is installed in a resultant shaft 84. In addition, a pedal operating power transmitting mechanism 102 is set up in space between an auxiliary power transmitting mechanism 101 and a resultant output mechanism 103 in the car width direction, and likewise the pedal operating power interrupting means (one-way clutch 88) is installed in space between the pedal operating power transmitting mechanism 102 and the auxiliary power transmitting mechanism 101. Moreover, a reversing means (one-way clutch 94) making a crankshaft 33 reversible is installed on this crankshaft 33, and then this reversing means is set up at the nearer side of the auxiliary power transmitting mechanism 101 than the pedal operating power transmitting mechanism 102.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auxiliary power assist type in which an electric motor is mounted on the body of a bicycle and the auxiliary power assists the pedaling force to facilitate climbing and running while receiving headwinds. The present invention relates to a bicycle, and more particularly, to an auxiliary power assist device mounted on an auxiliary power assist type bicycle as one unit having the electric motor built therein.

[0002]

2. Description of the Related Art In such an auxiliary power assist device,
In addition to the electric motor, devices such as a force combiner and a speed reducer are built in, and a crankshaft which is rotationally driven by the pedal effort of an occupant is pivotally supported. The electric motor generates auxiliary power, and the auxiliary power and the pedaling force applied to the crankshaft are combined by the combination device, and the combined force is output to the drive wheel side. Therefore, it is possible to travel easily even with a small pedal effort.

By the way, such an auxiliary power assisted bicycle can also be driven by only human power (pedal pedal force) without operating the electric motor. In general,
The speed reducer that connects the electric motor and the force combiner is provided with a pedal depressing force cutoff means such as a one-way clutch, and is designed so that the electric motor does not receive the pedal depressing force and is not reversely driven when traveling manually. .

[0004]

However, in the conventional auxiliary power assist device, the pedal depression force cutting means is arranged between the electric motor and the speed reducer. Therefore, during manual running, the speed reducer is accompanied by rotation of the crankshaft. Had to be driven in the reverse direction, resulting in a heavy pedaling force.

Further, the provision of the pedal-pedal force blocking means widens the lateral width of the auxiliary power assist device, which widens the left-right pedal spacing, making it difficult to pedal.

Furthermore, it is necessary to provide a reversing means for reversing the crankshaft separately from the pedaling force blocking means, and it is difficult to manufacture the auxiliary power assist device because there are many kinds of parts.

The present invention has been made in order to solve these problems, and reduces the pedal depression force during human running and, at the same time, does not widen the lateral width of the device, the pedal depression force cutoff means for the electric motor and the crankshaft. It is an object of the present invention to provide an auxiliary power assist device for an auxiliary power assist type bicycle, which can be provided with a reversing means and can be manufactured easily by reducing the number of types of parts.

[0008]

In order to achieve the above object, an auxiliary power assisted bicycle according to the present invention has a crank extending in the vehicle width direction and rotationally driven by a pedaling force as described in claim 1. A shaft, an electric motor that generates auxiliary power, a speed reducer that reduces the rotation of the electric motor, a resultant shaft that is rotatably supported in parallel with the crankshaft, the pedal effort and the auxiliary power A pedal depression force transmission mechanism and an auxiliary power transmission mechanism that transmit to the resultant force shaft, a resultant force output mechanism that outputs the rotational force of the resultant force shaft to the drive wheel side, and a pedal depression force cutoff unit that shuts off the pedal depression force to the electric motor during manual running. In the auxiliary power assist device for an auxiliary power assist type bicycle having the above, the pedal depression force cutoff means is provided on the resultant shaft.

Further, as described in claim 2, the pedal depression force transmission mechanism is arranged between the auxiliary power transmission mechanism and the resultant force output mechanism in the vehicle width direction, and the pedal depression force cut-off means is auxiliary to the pedal depression force transmission mechanism. It was provided between the power transmission mechanisms.

Further, as described in claim 3, a reversing means for reversing the crankshaft is provided on the crankshaft, and the reversing means is arranged closer to the auxiliary power transmission mechanism than the pedal effort transmission mechanism.

[0011]

According to the present invention, when the crankshaft rotates during manpower travel, the rotation is transmitted to the resultant force shaft via the pedal depression force transmission mechanism, and the rotation of the resultant force shaft is passed to the drive force output mechanism. Is output to the side. At that time, the pedal depression force is cut off from the electric motor by the action of the pedal depression force cutting means provided on the resultant shaft, and the reverse drive of the electric motor is prevented.

The pedal depression force cutoff means provided on the resultant force shaft is located on the downstream side (driven side) of the speed reducer of the electric motor and the auxiliary power transmission mechanism, and reduces the rotation of the resultant force shaft during manpower travel. Do not transmit to the device or auxiliary power transmission mechanism. For this reason, the speed reducer and the auxiliary power transmission mechanism are not reversely driven with the rotation of the crankshaft, and the pedal effort during manpower travel is significantly reduced.

According to the second aspect of the present invention, the pedal depression force cutoff means is provided in the widest span between the pedal depression force transmission mechanism, the auxiliary power transmission mechanism, and the resultant force output mechanism. It is possible to provide the pedal effort blocking means without expanding the width of the device.

Further, in the case of the configuration as claimed in claim 3,
Since the pedal depression force blocking means provided on the resultant shaft and the reversing means provided on the crankshaft are lined up in the front-rear direction within the auxiliary power assist device, the reversing means can be provided without expanding the width of the auxiliary power assist device. .

Further, in this case, since the rotation restraining direction of the pedal stepping force interruption means with respect to the auxiliary power transmission mechanism and the rotation restraining direction of the reverse rotation means with respect to the pedaling force transmission mechanism are in the same direction, the pedal depression force breaking means is the same. The reversing means can be commonly used as the same member.

[0016]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a left side view of an auxiliary power assisted bicycle according to the present invention.

The auxiliary power assisted bicycle 1 includes a body frame 2 made of, for example, a metal tube, and an auxiliary power assist device 3 is mounted on the lower portion of the body frame 2.

A head pipe 4 is located at the front of the body frame 2, and an upper tube 5 and a lower tube 6 extend rearward and obliquely downward from the head pipe 4.
The middle portion of the upper tube 5 and the vicinity of the rear end portion of the lower tube 6 are connected by a bridge member 7, and the rear end portion of the upper tube 5 is provided with a seat tube 8 provided at an acute angle.
Is joined to the lower end of the sheet via the sheet lug 9.

A pair of left and right joint tubes 11 extend downward from the seat lug 9, the lower end of the joint tube 11 is opened left and right, and a pipe-shaped chain lug 12 extending in the vehicle width direction is fixed. There is. Then, from the chain lug 12, a pair of left and right chain stays 13
Extends rearward.

On the other hand, a pair of left and right seat stays 14 extends obliquely rearward and downward from the vicinity of the upper end of the seat tube 8, and the lower ends of these seat stays 14 are rear ends 15.
It is joined to the rear end of the chain stay 13 via.

Mounting brackets 16, 17, 18 are fixed to the rear end portion of the lower tube 6, the intermediate portion of the joint tube 11 and the lower portion of the chain lug 12, respectively, and these mounting brackets 16, 17, 18 are fixed. The auxiliary power assist device 3 is fixed by bolts. Therefore, the rear end portion of the lower tube 6 is connected to the chain lug 12 via the auxiliary power assist device 3, and the auxiliary power assist device 3 also serves as a structural member of the vehicle body frame 2.

A front fork 19 is pivotally supported on the head pipe 4 so as to be rotatable left and right, and a front wheel 20 is supported on a lower end portion of the front fork 19. A handlebar 22 is fixed to the upper part of the front fork 19 via a handle post 21, and further, a front fender 23 for covering the front wheels 20, a front brake 24 for braking the front wheels 24, and a basket 25 for loading luggage on the front forks 19. Etc. are integrally provided for rotation.

A rear wheel 26 is pivotally supported on the rear end 15 located at the rear end of the vehicle body frame 2, and a rear fender 27 covering the rear wheel 26 is provided with a chain stay 13 and a seat stay.
A rear brake 28 for braking the rear wheels is provided on the seat stay 14 and is fixed to the rear end 15 and the rear end 15. The rear end 15 has a stand device 29 for erecting the vehicle body when parking the bicycle.
Is provided.

A seat post 31 is inserted into and fixed to the seat tube 8 from above.
A saddle 32 is attached to the upper end of the. On the other hand, a crank shaft 33 extending in the vehicle width direction is rotatably supported by the auxiliary power assist device 3, and the crank 34 is provided at both ends of the crank shaft 33.
L and crank 34R are fixed, both cranks 34L, 34
A pedal 35 is rotatably provided at the tip of each R.

A final drive sprocket 36 located on the right side of the auxiliary power assist device 3 is axially mounted on the crankshaft 33. The final drive sprocket 36 and the final driven sprocket 37 provided on the rear wheel 26 are provided. A chain 38 is wound between them.

The crankshaft 33 is rotationally driven in the forward rotation direction indicated by the arrow F1 when an occupant seated on the saddle 32 depresses the pedal 35 with his / her foot. At that time, the final drive sprocket 36 is moved in the same direction as the crankshaft 33. It rotates and this rotation is made by the chain 38 and the final driven sprocket 37
And the rear wheel 26 is driven.

A battery unit 40 for operating an electric motor incorporated in the auxiliary power assist device 3 is fixed between the upper tube 5 and the lower tube 6 of the vehicle body frame 2. This battery unit 40 is
For example, several small batteries and a charger are sealed in a battery case made of synthetic resin. A control device 41 for controlling the output of the electric motor is attached to the upper part of the auxiliary power assist device 3.

FIG. 2 is a cross-sectional view of an auxiliary power assist device 3 showing an embodiment of the present invention, and FIG. 3 is a III-II line of FIG.
I is a left side view of the auxiliary power assist device 3 as viewed from the arrow. Note that FIG. 2 is developed along the line II-II in FIG.

The casing 45 forming the outer shell of the auxiliary power assist device 3 is made of, for example, an aluminum alloy, and mainly has a case body 46 as shown in FIG. 2, and a left case cover 47 is provided on the entire left side of the case body 46. It has a structure in which the right case cover 48 is fixed to the front upper part on the right side of the case body 46. The control device 41 is fixed to the upper part of the case body 46 with two bolts 49. Note that FIG. 3 shows a state in which the left case cover 47 is removed.

The crankshaft 33 is rotatably supported on the rear portion of the casing 45 by using bearings 51 and 52, and the cranks 34L and 34R are bolted to both ends of the crankshaft 33 protruding left and right from the casing 45. Fixed at 53.

An electric motor chamber 54 is defined between the case body 46 of the casing 45 and the right case cover 48, and the above-mentioned electric motor 55 is installed therein. The electric motor 55 generates auxiliary power, and its main shaft 56 is parallel to the crankshaft 33. It should be noted that several bolts 57 inserted from the left side of the case body 46 are attached to the outer case 58 of the electric motor 55.
The right case cover 48 and the electric motor 55 are fastened together with the case body 46 by the bolts 57.

A roller type planetary speed reduction mechanism 60 is provided on the left side of the electric motor 55. This planetary reduction mechanism
A sun roller 61 of 60 is formed in a shaft shape, and its left end is pivotally supported by a bearing 62 provided on the left case cover 47 side, and its right end is pivotally supported by a bearing 63 provided on the case body 46 side. At the same time, the main shaft 56 of the electric motor 55 is spline-fitted to the left end of the main shaft 56 so as to be integrally connected to rotate.

An annular ring roller 64 is fixed to the case body 46 with bolts 65, and a reduction carrier 66 is rotatably supported around the sun roller 61 via a bearing 67 on the left side of the ring roller 64. ing. The deceleration carrier 66 is provided with four roller shafts 68 parallel to the sun roller 61, and a planet roller 69 is rotatably supported on each of these roller shafts 68. The outer peripheral surfaces of these four planetary rollers 69 are in contact with the inner peripheral surface of the ring roller 64 and the outer peripheral surface of the sun roller 61. Further, a primary drive gear 70 is provided on the left side surface of the reduction carrier 66 so as to rotate integrally therewith.

When the main shaft 56 of the electric motor 55 rotates, the sun roller 61 of the planetary speed reduction mechanism 60 also integrally rotates, and each planet roller 69 rotates between the fixed ring roller 64 and the rotating sun roller 61. While revolving around the sun roller 61,
As a result, the deceleration carrier 66 and the primary drive gear 70 are driven to decelerate and rotate. The main shaft 56 and the sun roller 61 are indicated by the arrow F.
As shown by 2, the forward rotation causes the reduction carrier 66 and the primary drive gear 70 to rotate in the same direction.

By the way, in this embodiment, the planetary speed reduction mechanism 60 is constituted by a roller type. For example, a pinion gear is provided on the outer periphery of the sun roller 61, and the ring roller 64 is changed to a ring gear (internal gear) to change each planet. The planetary reduction mechanism 60 may be configured as a gear type by changing the roller 69 to a planetary gear that meshes with the pinion gear and the ring gear.

On the other hand, a speed reduction shaft 71 is rotatably supported by bearings 72, 73 diagonally below and in front of the sun roller 61. The central axis of the reduction shaft 71 is parallel to the crankshaft 33,
The reduction shaft 71 is provided with a large-diameter primary driven gear 74 that meshes with the primary drive gear 70 and a small-diameter secondary drive gear 75 located inside the primary driven gear 74 so as to rotate integrally. The reduction shaft 71, the primary driven gear 74, and the secondary drive gear 75 rotate backward as indicated by an arrow R1 in FIG.

Further, an intermediate shaft 77 is provided diagonally below the reduction shaft 71.
Are rotatably supported by bearings 78 and 79. This intermediate shaft 77 is also installed in parallel with the crankshaft 33, and
A large-sized secondary driven gear 80 meshing with the secondary drive gear 75 of 71 and an auxiliary power drive sprocket 81 located inside the secondary driven gear 80 are provided integrally with each other. The intermediate shaft 77 rolls forward as shown by the arrow F3.

Each of the gears 70, 74, 75, 8 described above is
0 forms the reduction gear train 82. This reduction gear train 82
Together with the planetary reduction mechanism 60 constitute a reduction device that reduces the rotation of the electric motor 55.

Further, between the crankshaft 33 and the intermediate shaft 77, a resultant shaft 84 is installed in parallel with both shafts 33, 77.
This resultant force shaft 84 is rotatably supported by bearings 85 and 86, an auxiliary power driven sprocket 87 is axially mounted together with a one-way clutch 88 on the left side portion of the shaft, and a pedal depression force driven sprocket 89 is provided in the middle part. Rotation is provided integrally, and the resultant drive sprocket 90 is located on the right side.
Is provided integrally with the rotation.

A chain 92 is wound between the auxiliary power drive sprocket 81 and the auxiliary power driven sprocket 87, and the auxiliary power driven sprocket 87 is indicated by an arrow F4.
Move forward as shown in. In addition, as shown in FIG. 3, the intermediate shaft 77, the resultant shaft 84, and the crankshaft 33 are arranged in a straight line in the front-rear direction.

A pedal depression force drive sprocket 93 is axially mounted together with the one-way clutch 94 in the middle of the crankshaft 33, and a resultant driven sprocket 95 is rotatably attached to the crankshaft 33 at the right side of the crankshaft 33. It is provided. A chain 96 is placed between the pedal effort drive sprocket 89 and the pedal effort drive sprocket 93.
A chain 97 is wound between the resultant drive sprocket 90 and the resultant driven sprocket 95.

The resultant driven sprocket 95 is integrally formed with a boss 95a protruding to the right side surface of the casing 45, and the final drive sprocket 36 is rotationally fixed to the boss 95a. A ring-shaped sensor plate 98 is rotatably provided on the inner side surface (left side surface) of the final drive sprocket 36, while a vehicle speed sensor 99 is fixed to the casing 45. The rotational speed of the final drive sprocket 36, that is, the vehicle speed is detected by reading the movement of the protrusions 100 that are provided at equal intervals over the entire circumference.

The auxiliary power drive sprocket 81, the auxiliary power driven sprocket 87, and the chain 92 constitute an auxiliary power transmission mechanism 101. The pedal pedal force driven sprocket 89, the pedal pedal force drive sprocket 93, and the chain.
Reference numeral 96 constitutes a pedal effort transmission mechanism 102. Also, the resultant drive sprocket 90 and the resultant drive sprocket
The force output mechanism 103 is constituted by 95, the chain 97, and the final drive sprocket 36.

Then, the auxiliary power transmission mechanism 101, the pedal depression force transmission mechanism 102, the resultant force output mechanism 103, and the members such as the intermediate shaft 77 and the resultant shaft 84 are combined to form a resultant force device 104. In this embodiment, each sprocket 81, 87, 89, 9
The number of teeth of 0,93,95 are all set to be the same.

When the auxiliary power assisted bicycle 1 is running, the auxiliary power of the electric motor 55 is the planetary reduction mechanism.
After the speed is reduced by 60 and the reduction gear train 82, it is transmitted to the resultant shaft 84 by the auxiliary power transmission mechanism 101. The pedal effort applied to the crankshaft 33 is transmitted to the resultant shaft 84 by the pedal effort transmission mechanism 102. The rotational force of the resultant force shaft 84 is the resultant force of the auxiliary power and the pedal effort, and the resultant force is output by the resultant force output mechanism 103 to the side of the rear wheel 26 which is the driving wheel. Therefore, the auxiliary power assist type bicycle 1 can be easily traveled even with a small pedaling force.

Load sensors 110F and 110R are provided at the left end of the resultant shaft 84, for example. These load sensors
110F and 110R detect the moment acting on the resultant shaft 84 by the power transmission from the auxiliary power transmission mechanism 101 and the pedal effort transmission mechanism 102, and input this to the control means 41.

The control means 41 thus controls the load sensor 110.
From the magnitude and direction of the moment detected by the F, 110R, calculate the ratio of auxiliary power to the pedal effort, that is, the assist ratio, and adjust the current of the battery unit 40 so that this assist ratio is always a constant ratio. Electric motor
55 to control the output of the electric motor 55.

The control means 41 controls the vehicle speed and the final drive sprocket 36 according to the input signal from the vehicle speed sensor 99.
When the vehicle speed exceeds a certain level, the electric power supply to the electric motor 55 is stopped to prevent the vehicle speed from becoming excessive.

By the way, the auxiliary power assisted bicycle 1 can also be run only by pedaling force like an ordinary bicycle. When driving manually like this, the crankshaft
The rotation of 33 passes through the pedal effort transmission mechanism 102 and then the resultant force shaft 84
The rotation of the resultant force shaft 84 is output to the rear wheel 26 side by the resultant force output mechanism 103.

One-way clutch provided on the resultant shaft 84
The reference numeral 88 functions as a pedal depression force cutoff unit that cuts off the pedal depression force with respect to the electric motor 55 during such manual running. That is, the one-way clutch 88 is an electric motor
When the 55 is activated, the rotation of the auxiliary power driven sprocket 87 is transmitted to the resultant force shaft 84, but when driving manually, the connection between the auxiliary power driven sprocket 87 and the resultant force shaft 84 is cut off and the resultant force shaft 84 is disconnected.
The auxiliary power driven sprocket 87 is idled to interrupt the pedaling force to prevent the electric motor 55 from being reversely driven.

In the present invention, since the one-way clutch 88, which is the pedal depression force cutoff means, is provided on the resultant shaft 84, the electric motor 55, the speed reducer including the planetary speed reduction mechanism 60 and the reduction gear train 82, and the auxiliary power transmission. The power transmission system such as the mechanism 101 is not reversely driven during manual driving. Therefore, the rotational resistance and rotational inertia force of these power transmission systems are not applied to the crankshaft 33, and the pedal effort during human-powered traveling is greatly reduced.

Further, in the present invention, the pedal effort transmission mechanism 10
2 Auxiliary power transmission mechanism 101 and resultant force output mechanism 10
A one-way clutch 88 is provided between the pedal depression force transmission mechanism 102 and the auxiliary power transmission mechanism 101.

As described above, since the pedal depression force interruption means is provided in the widest span section between the auxiliary power transmission mechanism 101, the pedal depression force transmission mechanism 102, and the resultant force output mechanism 103, the width of the auxiliary power assist device 3 is reduced. The one-way clutch 88 can be provided without expanding.

On the other hand, the one-way clutch 94 provided on the crankshaft 33 functions as a reversing means that enables the crankshaft 33 to rotate in the reverse direction during manual running. That is, the one-way clutch 94 transmits only the rotation of the crankshaft 33 in the F1 direction to the pedal depression force drive sprocket 93, and disconnects the crankshaft 33 and the pedal depression force drive sprocket 93 when the crankshaft 33 reverses. The pedal depression force drive sprocket 93 idles with respect to the crankshaft 33, and the crankshaft 33 can be rotated in the reverse direction.

If the crankshaft 33 can rotate in the reverse direction as described above, the pedal 35 can be stopped to allow the vehicle to run by inertia or to perform a seesaw rowing, for example.

In the present invention, the one-way clutch 94 which is the reverse rotation means is provided on the crankshaft 33, and the reverse rotation means is arranged closer to the auxiliary power transmission mechanism 101 than the pedal effort transmission mechanism 102. By arranging in this way, the one-way clutch that is the pedal depression force cutting means provided on the resultant shaft 84
Since 88 and the one-way clutch 94, which is the reversing means provided on the crankshaft 33, are lined up in the front-rear direction within the auxiliary power assist device 3, the one-way clutch 94 can be provided without expanding the width of the auxiliary power assist device 3. it can.

Further, in this case, the direction of suppressing the rotation of the one-way clutch 88 with respect to the auxiliary power transmission mechanism 101 and the direction of suppressing the rotation of the one-way clutch 94 with respect to the pedal effort transmission mechanism 102 are the same, so that the one-way clutch 88 and the one-way clutch are the same. 94 can be made common as the same member.

In this embodiment, the unit A in which the one-way clutch 88 is integrated with the auxiliary power driven sprocket 87.
And a unit B in which the one-way clutch 94 is integrated with the pedal depression force drive sprocket 93 are formed as the same component, and only the direction thereof is reversed and incorporated.

As described above, since the one-way clutch 88 and the one-way clutch 94 can be commonly used as the same member, it is possible to reduce the types of constituent parts of the auxiliary power assist device 3 and to facilitate the manufacture.

[0060]

As described above, the auxiliary power assist device for an auxiliary power assist type bicycle according to the present invention has a crankshaft extending in the vehicle width direction and driven to rotate by pedaling force, and an electric motor for generating auxiliary power. A motor, a speed reduction mechanism for reducing the rotation of the electric motor, a resultant force shaft rotatably supported in parallel with the crankshaft, and a pedal effort transmission mechanism for transmitting the pedal effort and auxiliary power to the resultant axle. And an auxiliary power transmission mechanism having an auxiliary power transmission mechanism, a resultant force output mechanism for outputting the rotational force of the resultant shaft to the drive wheels, and a pedal effort blocking means for interrupting the pedal effort with respect to the electric motor during manual driving. In the above auxiliary power assist device, the pedal depression force blocking means is provided on the resultant shaft.

In this case, the pedal depression force cutoff means is located on the downstream side (driven side) of the reduction mechanism or the auxiliary power transmission mechanism of the electric motor. It is not driven in the reverse direction, and the pedal effort when driving manually can be greatly reduced.

In the auxiliary power assist device for an auxiliary power assist type bicycle according to the present invention, the pedal depression force transmission mechanism is arranged between the auxiliary power transmission mechanism and the resultant force output mechanism in the vehicle width direction, and the pedal depression force cut-off means is arranged on the pedal. Since it is provided between the pedal effort transmission mechanism and the auxiliary power transmission mechanism, the pedal depression force cutoff means is provided in the section with the widest span between the pedal effort transmission mechanism, the auxiliary power transmission mechanism, and the resultant force output mechanism. It is possible to install pedal depression force blocking means without expanding the width.

Further, the auxiliary power assist device for an auxiliary power assist type bicycle according to the present invention is provided with a reversing means on the crankshaft for enabling the reverse rotation of the crankshaft, and the reversing means is more effective than the pedaling force transmission mechanism. Since it is arranged on the transmission mechanism side, the pedal depression force blocking means provided on the resultant shaft and the reversing means provided on the crankshaft are arranged in the front-rear direction in the auxiliary power assist device, thereby expanding the width of the auxiliary power assist device. Instead, a reversing means can be provided.

Moreover, since the rotation restraining direction of the pedal depression force shut-off means with respect to the auxiliary power transmission mechanism and the rotation restraining direction of the reverse rotation means with respect to the pedal depression force transmission mechanism are in the same direction, the pedal depression force shut-off means and the reverse rotation means are the same. It can be shared as a member, and the number of types of constituent parts of the auxiliary power assist device can be reduced to facilitate manufacturing.

[Brief description of drawings]

FIG. 1 is a left side view of an auxiliary power assist type bicycle according to the present invention.

FIG. 2 is a cross-sectional view of an auxiliary power assist device showing an embodiment of the present invention.

3 is a left side view of the auxiliary power assist device taken along the line III-III of FIG.

[Explanation of symbols]

 1 Auxiliary power assist type bicycle 3 Auxiliary power assist device 26 Rear wheel which is a driving wheel 33 Crankshaft 55 Electric motor 60 Planetary speed reducer mechanism which constitutes a speed reducer 82 Reduction gear train which constitutes a speed reducer 84 Joint shaft 88 Pedal pedal breaking means One-way clutch 94 as one-way clutch One-way clutch as reversing means 101 Auxiliary power transmission mechanism 102 Pedal pedal force transmission mechanism 103 Combined force output mechanism

Claims (3)

[Claims] 1. A crankshaft that extends in the vehicle width direction and is driven to rotate by pedaling force, an electric motor that generates auxiliary power, a speed reducer that reduces the rotation of the electric motor, and a crankshaft that is parallel to the crankshaft. A resultant force shaft rotatably supported, a pedal effort transmission mechanism and an auxiliary power transmission mechanism that transmit the pedal effort and auxiliary power to the resultant axle, and a resultant force output mechanism that outputs the rotational force of the resultant axle to the drive wheel side. And an auxiliary power assist device for an auxiliary power assist type bicycle, which is provided with pedal depressing force cutting means for cutting off the pedal depressing force with respect to an electric motor during manpower travel, characterized in that the pedal depressing force cutting means is provided on a resultant force axis. Auxiliary power assist device for an auxiliary power assist type bicycle. 2. The pedal depression force transmission mechanism is arranged between the auxiliary power transmission mechanism and the resultant force output mechanism in the vehicle width direction, and the pedal depression force cutoff means is provided between the pedal depression force transmission mechanism and the auxiliary power transmission mechanism. Item 2. An auxiliary power assist device for an auxiliary power assist type bicycle according to item 1. 3. The auxiliary power assist type according to claim 2, wherein a reversing means for enabling reverse rotation of the crankshaft is provided on the crankshaft, and the reversing means is arranged closer to the auxiliary power transmission mechanism than the pedal effort transmission mechanism. Bicycle auxiliary power assist device.