JPH10147283A - Bicycle with electric motor auxiliary power unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bicycle with electric motor auxiliary power unit serving as an operating means well actuating a turning force detection means. SOLUTION: This device is constituted so as to comprise a power transmission means transmitting turning force of an electric motor 40 to a hollow shaft 70, crankshaft 80 transmitted with stepping force of a pedal, work means operated by rotating the crankshaft 80 to actuate a torque sensor 100, and a control means 170 controlling the electric motor 40 in accordance with an output of the torque sensor 100. Here, the work means is constituted by a work member 95, having a reference member 57 provided in an output gear 56, drive member 90 provided with a protruded shape 90b (guide part) along an axial direction and a fitting groove 95a (guided part) guided by this protruded shape 90b to be provided capable of sliding in an axial direction of the drive member 90, and a coil spring 97 (spring member) energizing the work member 95 to a reference member side, so as to improve operation of the work member 95.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bicycle with an electric auxiliary power unit, and more particularly to an operating means for operating a rotational force detecting device for detecting a pedaling force.

[0002]

2. Description of the Related Art Conventionally, when the depressing force of the pedal is increased, such as when traveling on an uphill or the like, the depressing force is detected by a turning force detecting means, and the turning force corresponding to the magnitude of the depressing force is detected. BACKGROUND ART Bicycles with an electric auxiliary power unit that can easily travel by assisting from an electric motor are widely known.

[0003] The structure of the actuating means for operating the rotational force detecting means based on the pedaling force applied to the pedal is basically such that the pedaling force is applied to both ends of the pedal via a crank to which the pedal is attached. Actuating means for transmitting to the crankshaft and operating in accordance with the rotational force applied to the crankshaft is provided, and the operation of the operating means activates the rotational force detecting means including a switch means or a strain sensor to drive the electric motor. Then, the rotational force of the electric motor is transmitted to a hollow shaft on which a sprocket is mounted via a speed reduction mechanism composed of a gear group, and the rotational force of the electric motor is transmitted through a chain applied to the sprocket and a rear wheel. The power is transmitted to the rear wheels to assist power.

[0004] As one of the prior arts of the operating means, it is described in the specification and drawings which the applicant has already filed as Japanese Patent Application No. 7-292507. The operating means described in the specification and the drawings of this application are shown in FIGS.
This will be described with reference to FIG. In the above specification, the operating means is described as the rotational force switching means, but in the following description, this will be described as the operating means. Further, the reference numerals in the drawings do not correspond to those in the drawings of the application.

In FIG. 10, C1 denotes an electric auxiliary power unit attached to a hanger lug 301 to which a vertical pipe 302 and a lower pipe 303 of a bicycle body B1 (not shown) are attached.
The motor 340 is mounted on the motor case 340 and a power transmission means 350 including gears 342, 351, and 355 disposed in the case 330 and transmitting the rotational force of the motor 340, that is, power. A drive gear 356 meshes with the gear 355. The drive gear 356 is mounted on a hollow shaft 370, and a crankshaft 380 having a crank 380 having a pedal 381a is rotatably provided in the hollow shaft 370. The crankshaft 380 has one direction. A rotational force detecting member 390 having a flange portion 391 formed with a through hole 393 via a sex clutch 385 is provided. The rotational force detecting member 390 is connected to the drive gear 3
The drive gear 356 is configured to move relative to the drive gear 356 in the rotational direction via a drive spring 360 disposed between the drive gear 356 and the shaft hole 356.
12A, an inclined surface 357a is formed concentrically on the outer periphery and gradually rises upward as shown in FIG. 12 in the direction of the arrow shown in FIG. 12, that is, in the direction in which the drive gear 356 rotates during traveling. Three projections 357 are formed.

[0006] On the opposite side of the driving gear 356 of the flange portion 391 provided on the rotational force detecting member 390, an offset plate 395 is provided so as to be able to contact and separate from the flange portion 391. The plate 395 is provided corresponding to the through hole 393 of the flange portion 391, and has a flange portion 396a (see FIG. 12) formed at the tip end thereof, and can slide in the through hole 393.
6 are provided integrally. The eccentric plate 395 allows the slide shaft 396 to pass through the through hole 393, and the eccentric plate 395 is always provided between the flange portion 396a and the surface of the flange portion 291 facing the drive gear 356. Is provided via a coil spring 397 that urges the flange portion 391 in the direction of pressing against the flange portion 391. The tip of the slide shaft 396 is moved by the biasing force of the coil spring 397 to the drive gear 356.
The rotational force detecting member 390 moves while being pressed against the inclined surface 357a of the protrusion 357 formed as described above.

The driving gear 356, the rotational force detecting member 390, the driving spring 360 and the eccentric plate 39
5 constitutes an actuating means, which converts the rotation of the crankshaft 380 into an axial movement, thereby displacing or moving the deflection play 395 in the axial direction.

Incidentally, the above-mentioned operating means does not have a structure in which the deflection plate 395 is disposed between the rotational force detecting member 390 and the driving gear 356, but a rotational force detecting member 390.
, That is, on the side opposite to the drive gear 356. In other words, the drive gear 35 with the rotational force detecting member 390 interposed, that is, with the rotational force detecting member 390 interposed therebetween.
6 and the eccentric plate 395 are disposed, so that the tip of the slide shaft 396 for moving the eccentric plate 395 in the axial direction is provided on the drive gear 356 with the inclined surface 357.
In order to bring the slide shaft 396 into contact with a, the slide shaft 396 must pass through a through hole 393 provided in the rotational force detecting member 390.

As described above, the operating means is the rotational force detecting member 39.
0, the drive gear 356 and the eccentric plate 395 are arranged. Therefore, as the slide shaft 396 moves its tip upward along the inclined surface 357a of the projection 357, the slide shaft When moving inside the hole 393, the slide shaft 396 has a force in the axial direction of the slide shaft 396 and a force along the rotation direction of the rotational force detecting member 390, that is, a force perpendicular to the axial direction of the slide shaft 396. Power will be added. For this reason, the slide shaft 396
Will tilt as shown by the two-dot chain line in FIG.
The frictional resistance between the through-hole 393 and the peripheral surface of the through-hole 393 becomes large, and the smooth operation, that is, the movement of the slide shaft 396 is hindered. This is because the slide shaft 396 is provided at the outer peripheral portion of the flange portion 391 of the rotational force detecting member 390, that is, at a portion where the radius from the rotational center of the rotational force detecting member 390 is large, so that the force in the rotational direction increases. Therefore, the frictional resistance increases, and the smooth movement of the slide shaft 396 is further impeded. When the frictional resistance between the slide shaft 396 and the through hole 393 increases, the slide shaft 396 and the through hole 39
As a result, a vicious cycle occurs in which the degree of tilt of the slide shaft 396 is further increased, the frictional resistance is further increased, and the smooth operation of the slide shaft 396 is further impaired.

Further, the deflection plate 395 urges the tips of the three slide shafts 396 provided integrally with the deflection plate 395 by a coil spring 397 to thereby form the projection 3.
57 is positioned by contacting the inclined surface 357a of the slide shaft 57, the through hole 393, the slide shaft 3
96, when the eccentric plate 395 is attached to the rotational force detecting member 390 due to the dimensional variation of the coil spring 397 and the like, the flatness of the eccentric plate 395 (the axis of the plane orthogonal to the axial direction of the crankshaft 380) It is difficult to increase the accuracy of the degree of inclination with respect to the heart), and if the accuracy of the flatness is reduced, a situation occurs in which the switch means S operated by the deflection plate 395 cannot be operated accurately. Further, as described above, when the slide shaft 396 and the peripheral wall of the through hole 393 are worn, the degree of inclination of the slide shaft 396 is increased, and the degree of wear is not the same as that of the three pieces.
The flatness is reduced, and the switch means S cannot be operated accurately.

The accuracy of the flatness of the deflection plate 395 is continuously assisted in accordance with the pedaling force by operating a torque sensor such as a strain sensor based on the deflection amount of the deflection plate 395. This is even more important when the electric motor 340 is controlled as described above.

[0012]

SUMMARY OF THE INVENTION As described above, in the bicycle with an electric auxiliary power device, which the applicant has previously filed, the operation of operating the proximity switch for controlling the electric motor in accordance with the turning force converting means, that is, the pedaling force of the pedal. Since the means has a structure in which the rotational force detecting member is interposed between the eccentric plate and the driving gear 356, it is not satisfactory in that the eccentric plate can be smoothly operated via the slide shaft. In addition, the slide shaft and the like are easily worn, and it is not always satisfactory in that the accuracy of the flatness of the eccentric plate is increased to accurately control the electric motor according to the pedaling force.

[0013]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and the invention according to claim 1 is provided at a final stage comprising an electric motor and a plurality of gears disposed in a case. A power transmission means for transmitting the rotational force of the electric motor via an output gear having a fitting hole formed therein, and a chain rotatably mounted on the case and having one end fitted into the fitting hole and the other end provided with a chain. A crankshaft having a sprocket for transmitting treading force to wheels through the hollow shaft, and a crank having a pedal mounted on one end side and having a pedal mounted on both ends and penetrating the hollow shaft. An operating means that operates by rotation of the crankshaft; an operating rod that detects the operation of the operating means; a torque detecting means that detects a torque applied to the crankshaft; Control means for controlling the electric motor in accordance with the output of the output means; and a bicycle with an electric auxiliary power device for assisting the power by controlling the electric motor in accordance with the rotational force applied to the crankshaft in accordance with the pedaling force. At
A reference member having a sliding surface formed of an inclined surface provided on the output gear, wherein the operating means has a cylindrical wall surrounding the one-way clutch at a central portion, and the crank is provided via the one-way clutch. A drive member that rotates in one direction with the shaft and is provided with a guide portion along the axial direction of the crankshaft; and a slidable member that is disposed between the drive member and the output gear and slides on the slide surface. An actuating member having a surface and having a guided portion guided by the guide portion and provided slidably in the axial direction while rotating within a predetermined range in the circumferential direction,
A bicycle with an electric auxiliary power unit is provided between the operating member and the driving member, and a spring member configured to bias the sliding surface toward the sliding surface.

As described above, according to the first aspect of the present invention, the operating means includes a reference member having a sliding surface formed of an inclined surface provided on the output gear, and a guide portion extending along the axial direction of the crankshaft at the center. A driving member provided, and a sliding surface disposed between the driving member and the output gear, the sliding surface sliding on the sliding surface, and having a guided portion guided by the guide portion. An actuating member provided so as to be slidable in the axial direction while rotating within a predetermined range in the direction, and urging the slidable surface against the sliding surface provided between the actuating member and the driving member. With the spring member, the operating member slides on the sliding surface without interfering with the driving member,
Since the guide member is guided in the axial direction along the guide portion provided at the central portion of the drive member, the drive member has an operation of smoothly sliding while maintaining flatness.

According to a second aspect of the present invention, in the first aspect of the invention, the operating member is a bicycle with an electric auxiliary power unit, wherein the operating member is formed of a material having a small friction coefficient.

According to the second aspect of the present invention, since the operating member is formed of a material having a small coefficient of friction, in addition to the function of the first aspect, the sliding of the operating member can be further smoothed and the wear can be improved. This has the effect of preventing

According to a third aspect of the present invention, the slidable surface of the operating member according to the first or second aspect of the present invention is an inclined surface which is in surface contact with the inclined surface of the sliding surface provided on the reference member. This is a formed bicycle with an electric auxiliary power unit.

According to the third aspect of the present invention, the operating member can be slid while maintaining the flatness in addition to the functions of the first and second aspects of the invention. This has the effect that the torque detecting means can be operated accurately.

According to a fourth aspect of the present invention, in the first to third aspects of the present invention, the reference member is provided with a contact surface made of a flat surface orthogonal to the axial direction of the crankshaft, and the operating member is provided with a flat surface. An electric assist which forms a contact surface which is in contact with the contact surface, and positions the operation member with respect to the reference member by bringing the contact surface into contact with the contact surface in a non-operation state of the operation member; It is a bicycle with a power unit.

According to a fourth aspect of the present invention, in addition to the functions of the first to third aspects, the operation member operates in a stable state when the operation member is in a non-operation state. Since the members can be positioned, distortion, deformation, and the like of the operating member can be prevented, and the rotation force detecting means can be operated accurately.

According to a fifth aspect of the present invention, in the first to fourth aspects of the invention, a rotatable steel ball is provided on the operating rod of the rotational force detecting means, and the operating member is formed of synthetic resin. This is a bicycle with an electric auxiliary power unit.

According to the fifth aspect of the present invention, in addition to the effects of the first to fourth aspects of the present invention, it is possible to prevent wear of the operating member and the detecting portion and to smooth both of them. It has an effect that it can be operated, and therefore, the rotational force detecting means can be operated accurately.

According to a sixth aspect of the present invention, there is provided a bicycle with an electric auxiliary power unit, wherein the operating member according to the first to fifth aspects is made of polyacetal resin having a small coefficient of friction.

According to the sixth aspect of the present invention, since the operating member is made of a polyacetal resin having a small coefficient of friction, it is easy to manufacture the operating member in addition to the functions of the first to fifth aspects. It has the effect that it can be made inexpensive.

[0025]

Next, an embodiment of the present invention will be described with reference to FIGS. As shown in the figure,
Bicycle with electric auxiliary power unit (hereinafter simply referred to as bicycle) A
Is composed of a vehicle body B and an electric auxiliary power device (hereinafter simply referred to as a power device) C attached to the vehicle body B. The vehicle body B is a general bicycle, that is, a general-purpose bicycle that is generally commercially available.
A vertical pipe 2 and a lower pipe 3 having one end fixed to
A frame 6 comprising an upper pipe 5 having one end fixed to a head pipe 4 fixed to the other end of the lower pipe 3 and the other end fixed to a lower portion of the upright pipe 2; A chain stay 7 having a fixed side, a front fork 8 attached to the head pipe 4, a handle 9 attached to an upper end of the front fork 8, a front wheel 10 attached to a lower end of the front fork 8, Pipe 2
Back fork 11, one end of which is fixed to the upper part of the vehicle, and the other end of which is fixed to the other end of the chain stay 7 via a rear pawl (not shown), a rear wheel 12 attached to the other end of the chain stay 7 A saddle 13 attached above the standing pipe 2 and a loading table 1 provided above the rear wheel 12
4 and so on. The front wheel 10 and a part of the rear wheel 12 are covered by covers 10a and 12a, respectively. The hanger lug 1 is provided with a crankshaft 80 to be described later rotatably, and a left crank 81 and a right crank 82 provided with pedals 81a and 82a are attached to both ends of the crankshaft 80, respectively. . Further, a battery case 14a for accommodating a battery (not shown) is attached to a lower portion of the loading tray 14. The battery (not shown) is connected to the electric motor 40 and the control means 170 by a lead 16 as shown in FIG. A chain 18 is mounted on a sprocket 17 for transmitting the rotational force during traveling and a sprocket (not shown) of the rear wheel 12.

Next, the configuration of the power unit C and how to assemble the power unit C will be described.

First, the structure of the power plant C is shown in FIGS.
It will be described based on. As shown in the figure, a power device C includes a case 20 as a storage case, an electric motor 40 attached to the case 20, and a speed reduction mechanism 5 as a power transmission means.
The case 20 is provided with a hollow shaft 70 which is attached to the case 20 via a bearing and to which the rotational force is transmitted from the speed reduction mechanism 50, and a crankshaft 80 is provided through the hollow shaft 70. I have. In the case 20, there is provided a control means 1 comprising a microcomputer or the like to be described later.
70 etc. are stored.

Next, the above components will be described. First, the case 20 includes a bottom wall 231 and the bottom wall 2.
A case main body 230 is formed in a substantially bottomed box shape having a peripheral wall 232 formed around the periphery of the base 31 and having one end opened, and a lid case 250 for closing the opening of the case main body 230. The case body 230 and the lid case 250 are formed of a material having good thermal conductivity, for example, a metal such as aluminum.

In the case body 230, an installation chamber 233 in which a part of the speed reduction mechanism 50 is installed is formed on one end side, that is, on the side where the hollow shaft 70 is mounted, and on the other end side. A storage room 234 in which the control means 170 and the like are stored is provided adjacent to the installation room 233. The side of the storage chamber 234, that is, the hollow shaft 7
A mounting portion 235 formed side by side with the storage chamber 234 and to which the electric motor 40 is mounted is provided on the side where the protrusions 0 protrude. The mounting portion 235 and the installation chamber 233 are provided.
And an arrangement chamber 236 in which a part of the speed reduction mechanism 50 is disposed. The storage room 23
4 is a gap G between the mounting portion 235 and the mounting portion 235 as shown in FIG.
Is formed so as to form a U-shape with the mounting portion 235, and the lower pipe 3 is positioned in the gap G.

As shown in FIG. 2, the installation chamber 233 has a concave first bearing mounting portion 233a formed on the bottom wall 231 and a second bearing mounting portion formed through the bottom wall 231. 233b are respectively formed.

As shown in FIG. 2, the storage chamber 234 is provided with a printed board 171 having various electronic components 172 including a microcomputer as the control means mounted on a mounting boss 234a by mounting screws 234b. I have.

A battery level indicator 173 for displaying the remaining battery level is provided on the outer wall of the U-shaped portion of the storage chamber 234 as shown in FIG. The indicator 173 is provided with LEDs 173a to 173c corresponding to the remaining amount display numerical values (in FIG. 4, numerals 80 to 20 indicating the remaining amount of 80% to 20%), and these LEDs 173a to 173c are turned on. To display the remaining amount.

The mounting portion 235 for mounting the electric motor 40 is surrounded by an annular wall 235a and has an insertion opening 2 formed at one end, that is, opening upward in FIG.
A plurality of (only one is shown in FIG. 2) through holes 2 are provided on the bottom surface facing the insertion port 235b.
35c is provided.

The first bearing mounting portion 2 formed on the case main body 230 is attached to the lid case 250 mounted on the opening of the case main body 230 configured as described above.
A plurality of screw holes (only one is shown in FIG. 2) for mounting a screw 255 on the peripheral edge portion are formed with a bearing mounting portion 251 and a through hole 252 corresponding to the second bearing mounting portion 233b and the second bearing mounting portion 233b, respectively. 255a are formed. Further, an annular seal member storage portion 253a for storing the seal member 253 is formed around the through hole 252. The case body 230 and the lid case 250 are connected to the screw 255 through a packing (not shown) in a state where the speed reduction mechanism 50, various electronic components 172, and the like are stored.
By being fastened to 55a, they are integrally connected and attached.

The motor 40 is provided with a plurality of (only one is shown in FIG. 2) screws 43 on an end face of the motor 40 on the side where the output shaft 41 protrudes. 2 (only one is shown in FIG. 2).

Next, the speed reduction mechanism 50 will be described. The speed reduction mechanism 50 is connected to the output shaft 41 of the electric motor 40.
, A large-diameter gear 52 meshing with the gear 51, a small-diameter gear 53 provided integrally with the gear 52, and a gear 53 rotatably mounted on a fixed shaft 54a. A gear 54 including a large-diameter gear 54b that meshes with a bevel gear 54c integrated with the gear 54b, a bevel gear 55 that meshes with the bevel gear 54c, and a bevel gear 55
The gear 55b is mounted on the same shaft 55a as the shaft on which is mounted, and a drive gear 56 as an output gear meshing with the gear 55b.

The integrated gear 52 and gear 53 are mounted via a bearing 53b on a fixed shaft 53a fixedly mounted on the mounting base 42 mounted on the electric motor 40. A buffer 53c made of rubber or the like is fitted to the distal end of the fixed shaft 53a, and the distal end of the fixed shaft 53a is fitted to a through hole 235d provided in the case main body 230 via the buffer 53c. It is designed to be positioned and mounted.
The motor 40 to which the mounting base 42 is mounted is mounted on the mounting portion 235 by mounting the gear 52 and the gear 53 to the fixed shaft 53a via a bearing 53b and fitting the buffer 53c to the tip of the gear 52 and the gear 53. After the buffer 45a is fitted to the protrusion 44 provided on the mounting base 42, the electric motor 40 is inserted into the insertion port 235 of the mounting portion 235.
b, the fixed shaft 53a and the projection 44 fitted with the buffer 53c and the buffer 45a, respectively, are fitted into the through hole 235d and the through hole 235c, and then covered with the cover 47 with the buffer 45b interposed. The electric motor 40 is attached to the attachment portion 235 by attaching the lever 47 to the case main body 230 with the screw 46.

Both ends of a shaft 55a to which the bevel gear 55 and the gear 55b are mounted are connected to the case main body 2 via bearings 55c and 55d formed of ball bearings.
30 and the first bearing mounting portion 233a and the bearing mounting portion 251 provided on the lid case 250, respectively. The gear 55b is mounted on the shaft 55a via a one-way clutch 55f. The one-way clutch 55f rotates the gear 55b so as to transmit the torque of the electric motor 40 to the drive gear 56 so that the bicycle normally travels, that is, travels in the forward direction. It works to do so.
In other words, the one-way clutch 55f functions so as to idle when the cranks 81, 82 to which the pedals 81a, 82a are attached rotate in the traveling direction during manual driving described below.

A shaft hole 56a is formed in the center of the drive gear 56, and a concave and convex strip 56c is formed in the shaft hole 56a. Also, on the side surface of the drive gear 56 on the side of the lid case 250, a plurality of reference members (three in the embodiment, FIG. 2) are disposed concentrically around the shaft hole 56a as shown in FIGS. , Only one is shown in FIG. 3)
5 is formed, and the protrusion 57 is formed as shown in FIG.
As shown in the figure, an inclined surface 57a is formed as a sliding surface which gradually rises upward in the direction of the arrow shown in FIG.
The upper surface 57b of the projection 57 is formed as a flat surface as a contact surface orthogonal to the axial direction.

The cover case 250 of the drive gear 56
As shown in FIG.
7, one end of a plurality of compression springs 60 (three are provided in the embodiment and only one is shown in FIG. 3), which will be described later, and which is arranged concentrically with the shaft hole 56a. L
A letter-shaped regulating member 58 is formed.

Next, the power, that is, the rotational force of the electric motor 40, which is transmitted through the speed reduction mechanism 50, is fitted into the shaft hole 56a formed in the drive gear 56, and the sprocket 17
Will be described. This hollow shaft 7
Reference numeral 0 denotes an uneven ridge 7 having a through hole 71 therein and engaging with an uneven ridge 56c formed in the shaft hole 56a at one end.
2, the hollow shaft 70 is prevented from rotating in the circumferential direction by the engagement of the two concave and convex strips 56c and 72 when fitted in the shaft hole 56a, and the hollow shaft 70 rotates integrally with the drive gear 56. . A mounting member 17a to which the sprocket 17 is mounted is attached to the other end of the hollow shaft 70. The hollow shaft 70 is supported by a bearing 77 in the vicinity of the uneven shaft 72 formed on the one end.

Next, a description will be given of the crankshaft 80 which is mounted so as to penetrate through the through hole 71 of the hollow shaft 70. At one end of the crankshaft 80, a mounting portion 83 provided with a fitting portion 83a whose outer periphery is formed in a prismatic shape,
On the other end side, a fitting portion 84a whose outer periphery is similarly formed in a prismatic shape
Are formed, respectively. The attachment portions 83 and 84 are fitted to the fitting portions 81 of the left crank 81 and the right crank 82 of the general bicycle described above.
b, 82b.

A one-way clutch 85 is attached to the crankshaft 80 at a position close to the drive gear 56 attached to the hollow shaft 70, and is connected to the crankshaft 80 via the one-way clutch 85. Is mounted with a driving plate 90 made of metal as a driving member.
As shown in FIGS. 2 and 6, the driving plate 90 includes a cylindrical wall 90a and a disk-shaped flange portion 91 provided at one end of the cylindrical wall 90a. The blade 9 on which the one-way clutch 85 is engaged and disengaged is provided on the peripheral wall.
0c, and a plurality (three in the embodiment, one in FIGS. 2 and 3) formed along the axial direction, that is, the axial direction of the crankshaft 80 on the outer periphery of the cylindrical wall 90a. FIG. 6 shows only two ridges 90b as guide members.
Are formed.

The one-way clutch 85 rotates the drive plate 90 when the crankshaft 80 is rotated in the traveling direction by the cranks 81, 82 with the pedals 81a, 82a attached thereto during manual driving, Conversely, when the crankshaft 80 rotates, it idles and functions to prevent the drive plate 90 from rotating. Also, the flange portion 91 of the drive plate 90 and the drive gear 5
6 are formed at a predetermined distance from each other, and a compression portion which abuts against the other end of the compression spring 60 and compresses the surface of the flange portion 91 on the drive gear 56 side as shown in FIG. 92 are formed. The compression spring 60 is disposed between the L-shaped regulating member 58 and the compression section 92.

The magnitude of the urging force of the compression spring 60 is adjusted so as to be compressed in accordance with the rotational force applied to the drive plate 90 via the crankshaft 80 and the one-way clutch 85 during manual driving. Is set. That is, at the time of manual driving, the drive plate 90 and the drive gear 56 are set to move relative to each other according to the rotational force of the drive plate 90 that rotates together with the one-way clutch 85 with the rotation of the crankshaft 80. Is what is being done.

The flange portion 91 of the driving plate 90 has
As shown in FIGS. 2 and 5, three through holes 93 (only one is shown in FIGS. 2 and 5) are formed at portions corresponding to the protrusions 57 formed on the side surface of the drive gear 56.

An operating member 95 is formed between the flange portion 91 and the drive gear 56, is formed in a substantially disk shape, and is made of a synthetic resin having a small friction coefficient such as polyacetal. And this operating member 95
At the position corresponding to each of the through holes 93, there is provided a through shaft 96 which has an outer diameter and which is integrally formed and penetrates without contacting the inner peripheral surface of the through hole 93. As shown in FIGS. 3 and 6, a fitting groove 95a as a guided member that slides on a ridge 90b formed on a cylindrical wall 90a of the driving plate 90 is provided in the operating member 95.
Are formed, and both side surfaces 95b of the fitting groove 95a are formed in an arc shape that is in sliding contact with the outer peripheral surface of the cylindrical wall 90a. As a result, the operating member 95 is
When the peripheral surface of a is moved along the axial direction, it does not tilt with respect to the axial direction, that is, the state perpendicular to the axis of the cylindrical wall 90a is maintained. In other words, the accuracy of the flatness of the operating member 95 with respect to the cylindrical wall 90a is improved.
In addition, since the position where the ridge 90b and the fitting groove 95a are provided is near the axis and the operating member is formed of a synthetic resin having a small friction coefficient, good operation, that is, sliding can be maintained. Therefore, wear of the fitting groove 95a of the operating member 95 can be prevented. Further, since the operating member 95 is formed of a synthetic resin, its production is easy and the cost can be reduced.

The surface of the operating member 95 facing the drive gear 56 faces the inclined surface 57a of the projection 57 as the reference member formed on the drive gear 56, and slides on the inclined surface 57a. A projection 95d having an inclined surface 95c as a sliding surface is provided. The surface 95 e of the operating member 95 on which the protrusion 95 d is formed is formed as a flat surface as a contact surface orthogonal to the axial direction of the crankshaft 80. Further, the driving gear 56 of the operating member 95
An operating surface 95f for operating the operating rod 140 of the torque sensor 100 as a rotational force detecting means for detecting the rotational force of the crankshaft 80, which will be described later, is formed on the outer peripheral portion on the side opposite to.

The operating member 95 and the driving plate 90
A coil spring 97 is arranged between the flange portion 91 and the through shaft 96 inside the coil, and the coil spring 97 connects the operating member 95 to the drive gear 56.
When the operating member 95 is urged toward the driving gear 56 by the urging force of the coil spring 97, the operating member 95 is not actuated, that is, in the state in which the actuating member 95 does not move in the axial direction. The surface 95e of the member 95
And the upper surface 57b of the projection 57 formed on the drive gear 56 are in surface contact with each other, and both surfaces are formed as flat surfaces orthogonal to the axial direction. The flatness of the member 95 is not impaired. For example, even when the bicycle is not used for a long time, the operation plate 95 can be prevented from being distorted or deformed. It can be made to work.

The projection 57 as a reference member formed on the drive gear 56, the drive plate 90, the compression spring 60, and the operating member 95 act to convert the rotational movement of the crankshaft 80 into the axial movement. It constitutes the means. That is, the pedals 81a, 81a,
82a, the drive plate 90 and the drive gear 5
6, the compression spring 60 is compressed, and the driving plate 90 rotates ahead of the driving gear 56 to cause relative movement. As a result, the protrusion 9 formed on the operating member 95 is formed.
The inclined surface 95c of 5d is formed on the inclined surface 57a of the projection 57 provided on the drive gear 56 against the urging force of the coil spring 97.
, The coil spring 97 is compressed with this movement, and the operating member 95 is moved in a direction away from the drive gear 56, that is, converted into an axial movement.

When the operating member 95 moves in a direction away from the driving gear 56, the operating surface 95 of the operating member 95 moves.
The operating rod 140 of the torque sensor 100 as a rotational force detecting means which will be described later in detail is operated by f, and an electric output is output from the torque sensor 100, and this electric output is converted into a well-known A / D (analog / digital) converter. The digital value is converted into a digital value and sent to the control means 170.

When the vehicle changes from traveling on an uphill to traveling on a flat surface, the compression spring 60 returns by a restoring force in accordance with the rotational force at this time, and the relative movement between the drive plate 90 and the drive gear 56 is reduced. The protrusion 95d is moved downward from the inclined surface 57a of the protrusion 57, and the operating member 95 returns to the original state. As a result, the operating rod 1 of the torque sensor 100
Reference numeral 40 returns to the original state, and the electrical output at this time is similarly converted into a digital value and sent to the control means 170.

Next, the structure of the torque sensor 100 will be described with reference to FIGS. As shown in FIG. 8, the torque sensor 100 includes a case main body 101 including a lower case 110 and an upper case 120 attached to the lower case 110, a strain gauge 130 as a sensor provided in the case main body 101, Operating rod 140 which receives the acting force of detected torque and operating rod 140
And a coil spring 150 for transmitting the acting force received to the strain gauge 130.

Then, the strain gauge 130 is connected to the amplifier 1 via lead wires 133a and 133b as shown in FIG.
36, which is connected to the control means 170 via the A / D converter (not shown).
Controls the electric motor 40.

The upper case 120 is provided on the bottom wall 12.
1 is formed in a box shape with a bottom having an outer peripheral wall 122 formed on the outer periphery thereof. The bottom wall 121 is formed with a cylindrical portion 125 protruding inward and outward of the bottom wall 121, respectively. A guide hole 126 is formed in a portion from the outer end to the substantially middle portion, and a hole 127 larger in diameter than the guide hole 126 is formed in the portion from the middle to the inner end.
Are formed.

Then, the sensor, that is, the strain gauge 1
Reference numeral 30 denotes four thin-film resistors R1 formed on a surface of a strain body 131 made of, for example, aluminum through an insulating film.
R4 (not shown in FIG. 8) are attached by so-called semiconductor technology or the like, and the four resistors R1 to R4 are formed by printed wiring conductors to form a bridge W as shown in FIG. It is configured to be connected. A connection point between the resistors R1 and R3 and a connection point between the resistors R4 and R2 of the bridge W are connected to a power supply via lead wires 132a and 132b, and a connection point between the resistors R1 and R4. The connection point between the resistors R2 and R3 is an output terminal, and the output from this output terminal, that is, the electrical output corresponding to the magnitude of the detected torque, is output through the lead wires 133a and 133b. The amplifier 136 is sent to the control means 170 via the A / D converter (not shown).
In accordance with this output and an output from a speed sensor 160, which will be described later, the control means 170 controls an output including driving and stopping of the electric motor 40, that is, a torque.

The free end 131a of the flexure element 131 fixed to the lower case 110 and the upper case 120 with the fixed end sandwiched therebetween is located below the inner end of the cylindrical portion 125 and has a guide hole 126. A pin 134 having an axis coinciding with the axis of the guide hole 126 is attached to the tip of the pin 134, and the pin 134 receives the other end of the coil spring 150 in an annular shape. A collar 134a is formed.

The operating rod 140 is connected to the guide hole 1.
A shaft portion 141 guided by 26 and slidably fitted in the axial direction, and a large-diameter portion 14 formed at one end of the shaft portion 141.
And 2. A step 145 that receives the end of the coil spring 150 is provided at the tip of the operating rod 140.
The coil spring 150 is disposed between the step 145 and the annular flange 134a of the pin 134 in a state where the coil spring 150 is compressed by a predetermined amount. In addition, large diameter part 1
A steel ball 142a is rotatably fitted at the tip end of 42 in order to reduce friction with the working surface 95f of the operating member 95.

The operation of the torque sensor 100 is based on the same principle as that of a conventionally known torque sensor using a strain gauge. That is, the detected torque, that is, the rotational force of the crankshaft 80 converted into an axial force by the driving plate 90 and the operating member 95 is applied to the operating member 9.
5 acts on the operating rod 140 via the action portion 95f, and releases or imparts a bending force to the flexure element 131 by this action, thereby changing the resistance value of the resistors R1 to R4 and changing this resistance value. The electrical output from the bridge W according to the change is extracted. That is, in this embodiment, in a state where the depressing force of the pedals 81a and 82a does not exceed a predetermined value during the manual driving, that is, in a state where no relative movement occurs between the driving gear 56 and the driving plate 90, the operating member 95
Rod 140, coil spring 1 without moving
A maximum bending force is applied to the flexure element 131 via the control unit 50, and the electric output output from the bridge W in this state is set as a reference value. At this reference value, the control unit controls the electric motor 40 to stop. 170, and the pedaling force of the pedals 81a and 82a is increased as in the case of traveling uphill, etc., and the driving gear 56 and the driving plate 9 are driven in accordance with the pedaling force.
0, the operating member 95 moves and separates from the drive gear 56, and the operating rod 140, the coil spring 150
The bending force of the flexure element 131 applied through the bridge W decreases, and the resistance R1 of the bridge W
The resistance value of R4 changes, and an electrical output corresponding to the change is output from the bridge W, and the control means 170 controls the electric motor 40 via the amplifier 136 and the like.

A speed sensor 1 for detecting the speed of the bicycle A is provided inside the case 20 as shown in FIG.
60, a well-known magnetic sensor is used as the speed sensor 160, and a detection unit (not shown) of the speed sensor 160 is disposed close to the teeth of the drive gear 56, and the drive gear 56 rotates. By doing so, each time each tooth of the drive gear 56 approaches the detection unit, a pulse signal is generated from the speed sensor 160 and sent to the control means 170 via a signal line (not shown). The control means 170 calculates the number of pulses per unit time of the pulse signal sent from the speed sensor 160, and determines the vehicle speed based on this value.

The control means 170 outputs the output result detected by the torque sensor 100, that is, the pedal 81.
a, based on the rotational force corresponding to the pedaling force of 82a and the result detected by the speed sensor 160, that is, the vehicle speed,
The output of the electric motor 40 is controlled. In other words, according to the vehicle speed at each instant during traveling and the rotational force of the crankshaft 80 applied by the pedaling force of the pedals 81a and 82a at that time,
The motor 40 is controlled so as to assist the rotational force, that is, the power, according to the vehicle speed and the rotational force at the instant.

Next, the rear wheel 1 of the driving force of the electric motor 40 will be described.
2 will be described.

When the vehicle travels on an uphill or the like by manual driving, the pedaling force of the pedals 81a and 82a increases as described above, and a large relative movement occurs between the drive gear 56 and the drive plate 90. The inclined surface 95c of the formed projection 95d moves upward on the inclined surface 57a of the projection 57 provided on the drive gear 56, and the operating member 95
Move in the direction away from As a result, the operating rod 14
0 moves following the operating member 95 by the urging force of the coil spring 150, the bending force of the flexure element 131 decreases, the flexure element 131 recovers, the resistance values of the resistors R1 to R4 change, and the bridge W Outputs an electrical output corresponding to the change in the resistance value.
The control means 170 controls the electric motor 40 based on the vehicle speed calculated according to the output from 0. And the electric motor 40
Is rotated, the rotational force of the electric motor 40 is transmitted to the hollow shaft 70 via the power transmission means 50, and transmitted to the rear wheel 12 via the sprocket 17 and the chain 18 attached to the hollow shaft 70. That is, the pedals 81a, 8
By stepping on 2a, the rotation force of the electric motor 40, that is, the power, is assisted by the rotation force of the manual power transmitted to the crankshaft 80, and the bicycle A runs.

Next, how to assemble the power unit C will be described. First, a one-way clutch 85 to which the drive plate 90 is attached is prepared in a state where it is attached to the crankshaft 80.

The mounting portion 2 of the case body 230
An electric motor 40 is attached to the case 35 and the case body 2
30 each other gear 52 constituting the power transmission means 50
In addition, the bevel gear 55 is disposed at a predetermined position, and the hollow shaft 70 is inserted and attached to the bearing 77 attached to the second bearing attachment portion 233b. Also, the case body 230
The torque sensor 100 and the speed sensor 160
And printed circuit board 1 to which various electronic components 172 are attached
Attach 71 etc.

Then, the ridges and ridges 56c of the driving gear 56 are fitted to the ridges and ridges 72 formed on the hollow shaft 70, and the crankshaft 80 is inserted into the through hole 71 of the hollow shaft 70 via bearings 73a and 73b. insert. At the time of this insertion, the compression spring 60 is disposed between the regulating member 58 formed on the drive gear 56 and the compression portion 92 formed on the drive plate 90. Then, the lid case 250 is attached to the case body 230 in this state.
The power unit C is assembled by inserting the crankshaft 80 into the through hole 252 so as to close the opening of the case main body 230, and then attaching it with the screw 255.

Next, the vehicle body B of the general-purpose bicycle of the power plant C
First, the cranks (the left crank 81 and the right crank 82 in the embodiment) attached to the crankshaft of the vehicle body B are removed from the crankshaft, and then left and right attached to the left and right of the hanger lug 1. Remove the bowl and the right bowl from the hanger lug 1 and remove any other parts attached to the hanger lug 1.

Next, the mounting member 270 containing the bearing 270a is mounted on the female screw 1b formed on the inner peripheral wall at one end of the through hole 1a of the hanger lug 1. At this time, the flange 270 provided on one end surface of the hanger lug 1 and the mounting member 270
b and the mounting plate 280. In addition, in order to securely attach the mounting plate 280, as shown in FIG.
85 and attached. Then, from the other end side, the regulating member 2
73 is inserted into the through-hole 1a, and the mounting member 2 in which the bearing 271a is housed in the female screw 1c formed on the inner peripheral wall at the other end.
71 is attached. Next, the hollow shaft 70, which is built into the power plant C and protrudes outward, is inserted from the left side in FIGS. 2 and 7, and is rotatably supported by the bearings 270a and 271a. It is attached via a stop member 76. In this state, the axial movement of the hollow shaft 70 is restricted by the locking member 76 and the locking member 75 attached to the hollow shaft 70, and the hollow shaft 70 is mounted on the hanger lug 1. Next, the sprocket 17 is attached to the other end of the hollow shaft 70 via the attachment member 17a.

Then, as shown in FIG.
The power device C is mounted on the vehicle body B by fastening the mounting screws 286 such that the mounting holes 0 (not shown) correspond to the mounting bosses 231a provided on the bottom wall 231 of the case main body.

After the power unit C is mounted on the vehicle body B, the left crank 81 and the right crank 82 with the pedals 81a and 82a mounted on the mounting portions 83 and 84 of the crankshaft 80 are mounted with nuts 83b and 84b. Completes the assembly.

Next, the bicycle A constructed as described above
The operation when driving is described. First, a start switch (not shown) is closed to supply electric power to the electric motor 40 from the battery (not shown), and the bicycle is driven. When the vehicle is traveling on a flat ground or a downhill, as described above, the driver's pedals 81a and 82a have a small pedaling force and a small rotational force applied to the drive gear 56 via the crankshaft 80. The compression spring 60 disposed between the driving plate 90 and the driving plate 90 has a small amount of compression. Therefore, the relative movement between the driving gear 56 and the driving plate 90 is small, and the moving amount of the operating member 95 is also small. The operating rod 1 of the torque sensor 100 is moved with the movement of the operating member 95.
40 operates, an electric signal corresponding to the pedaling force at this time is output from the torque sensor 100 to the control means 170, and
The speed at this time is output from the speed sensor 160 to the control means 170. The control means 170 controls the electric motor 40 based on the outputs from the torque sensor 100 and the speed sensor 160 so as to output the torque to be assisted at this time. The driving force is transmitted to the rear wheel 12 via the drive gear 56, the hollow shaft 70, the sprocket 17, and the chain 18 to assist the rotational force, that is, the power. The assisting torque at this time is small.

Next, when traveling on an uphill or the like, a large rotational force is required, and as a result, the pedals 81a, 82
As a result, the rotational force applied to the crankshaft 80 and the driving plate 90 increases. That is, the load applied to the hollow shaft 70 that transmits the rotational force to the sprocket 17 that transmits to the rear wheel 12 via the chain 18 becomes large, so that the drive plate 90 and the drive gear 56
Are relatively large, and as a result, the movement of the operating member 95 is also large. When the amount of movement of the operating member 95 increases, the bending force of the flexure element 131 of the torque sensor 100 decreases, and with this decrease, the resistance values of the resistors R1 to R4 change. An output of a rotational force corresponding to the driver's treading force is output from the torque sensor 100 to the control means 170.
From 0, the vehicle speed at this time is output to the control means 170.

The control means 170 controls the torque sensor 100 and the speed sensor 160 as described above.
The electric motor 40 is controlled so as to output the rotational force to be assisted at this time based on the output of the motor, and the rotational force of the electric motor 40 transmits the power transmission means 50, the drive gear 56, the hollow shaft 70, the sprocket 17, and the chain 18 The rotation force is transmitted to the rear wheel 12 via the rear wheel 12 and assisted. At this time, the assisting torque is large, so that the driver can easily travel even when a large torque such as an uphill is required.

Then, as described above, the pedals 81a, 82
The operating means for converting the movement in the rotation direction caused by the rotation force of the crankshaft 80 applied in accordance with the stepping force of a into the movement in the axial direction to operate the operation rod 140 of the torque sensor 100 is provided on the drive gear 56 with an inclined surface. A driving member 90 provided with a protrusion 57a having a protrusion 57a and a ridge 90b extending in the axial direction of the crankshaft; and a driving member 90 disposed between the driving member 90 and the driving gear 56; An operating member 95 having a moving inclined surface 95c, a fitting groove 95a guided and slid by the ridge 90b, and provided slidably in the axial direction of the driving member 90; And the coil spring 97 disposed between the drive member 90 and the biasing surface 95c to bias the inclined surface 95c toward the inclined surface 57a.
The inclined surface 95c can slide on the inclined surface 57a without interfering with the driving member 90.
Since it is guided along the axial direction by b, it is possible to slide smoothly in the axial direction while maintaining flatness.

Since the operating member 95 is formed of a synthetic resin having a small coefficient of friction such as polyacetal resin, the sliding between the fitting groove 95a of the operating member 95 and the ridge 90b of the driving member 90 can be performed more smoothly. In addition, the wear can be prevented and the torque sensor 100 can be operated accurately.

Further, since the operating member 95 and the projection 75 provided on the drive gear 56 are slid by the inclined surfaces 95c and 57a formed respectively, the operating member 95 moves, that is, moves in the axial direction. Since the flatness with high accuracy can be maintained even when the
Reference numeral 5f indicates that the accurate contact of the tip of the operating rod 140 of the torque sensor 100, that is, the steel ball 142a, can be maintained, so that the accuracy of detecting the pedaling force can be enhanced and malfunction can be prevented.

The operating member 95 is made of a synthetic resin having a small coefficient of friction and the tip of the operating rod 140 is a steel ball 142a.
The sliding of the working surface 95f of the No. 5 and the steel ball 142a is smoothly performed, and the wear of both can be prevented. The inventor has confirmed through experiments that the wear of the working surface 95f of the operating member 95 when the operating member 95 is formed of polyacetal resin and when the operating member 95 is formed of soft iron, with the tip of the operating rod 140 being a steel ball 142a. As a result of examining the condition, it was found that abrasion was smaller in the case of forming with a polyacetal resin. It was also found that the generated noise was smaller in the case of the polyacetal resin. In the case of quenching with soft iron, it is expected that wear will be less than that of soft iron in terms of abrasion, but the productivity will be poor and expensive due to the number of quenching steps, and the surface will be roughened by quenching. There is a problem that abrasion is promoted by the rough surface. On the other hand, when formed of a synthetic resin such as a polyacetal resin, the productivity is high and the cost can be reduced.

When the operating member 95 is in a non-operating state, the operating member 95 and the projection 57 serving as a reference member are separated from each other by a surface 95 e on which a projection 95 d is formed and an upper surface 5 of the projection 57.
7b is brought into abutment, that is, surface contact, so that when the operating member 95 is in a non-operating state, the operating member 95 can be positioned in a stable state with respect to the projection 57 serving as a reference member. Since the positional relationship between the action surface 95f and the tip of the operating rod 140 is accurately determined, malfunction of the torque sensor 100 can be prevented.

In the above-described embodiment, the one-way clutch 85 is directly provided on the inner surface of the cylindrical wall 90a of the drive plate 90.
Is configured to form a blade portion 90c that engages and disengages, but this may be a configuration in which a cylindrical member having the blade portion 90c is separately formed and attached to the inside of the cylindrical wall 90a.

Further, the operating member 9 in the above-described embodiment is used.
The material having a small coefficient of friction for forming 5 is not limited to a synthetic resin, but may be formed of another material such as a ceramic.

In the above embodiment, the ridge 90b as the guide portion and the engaging groove 95a as the guided portion are formed at the center portion, but they are formed at the outer peripheral portion. However, in the case of the configuration of the above embodiment, there is an advantage that the structure is simplified and the size can be reduced. Also,
The configuration may be the reverse of the ridge 90b as the guide portion and the engagement groove 95a as the guided portion.

[0082]

According to the first aspect of the present invention, the operating means includes a reference member having a sliding surface formed of an inclined surface provided on the output gear, and a guide extending along the axial direction of the crankshaft. A driving member provided with a portion, a sliding surface disposed between the driving member and the output gear, the sliding surface sliding on the sliding surface, and a guided portion guided by the guide portion. An actuating member provided so as to be slidable in the axial direction while rotating within a predetermined range in the circumferential direction, and the sliding surface provided between the actuating member and the driving member is a sliding surface. Since the operating member slides on the sliding surface without interfering with the driving member, the operating member slides along the sliding surface and the shaft moves along the guide portion provided at the center of the driving member. It is said that it can slide smoothly while maintaining flatness because it is guided in the direction It is intended to have an effect.

According to a second aspect of the present invention, in the first aspect of the invention, the operating member is formed of a material having a small coefficient of friction. Can be further smoothed and wear can be prevented.

According to a third aspect of the present invention, the slidable surface of the operating member according to the first or second aspect of the invention is an inclined surface which is in surface contact with the inclined surface of the sliding surface provided on the reference member. Because of the formation, in addition to the effects of the first and second aspects of the present invention, the operating member can be slid while maintaining the flatness, so that the rotational force detecting means can be operated accurately. It has the effect that it can do.

According to a fourth aspect of the present invention, in the first to third aspects of the present invention, the reference member is provided with a contact surface formed of a flat surface orthogonal to the axial direction of the crankshaft, and the operating member is provided with the contact member. Forming a contact surface that is in contact with the contact surface, and in a non-operating state of the operating member, the operating member is positioned with respect to the reference member by bringing the contact surface into contact with the contact surface. In addition to the effects of the first to third aspects of the present invention, since the operating member can be positioned with respect to the driving member in a stable state when the operating member is not operating, distortion and deformation of the operating member can be prevented. This has the effect that the rotational force detecting means can be operated accurately.

According to a fifth aspect of the present invention, in the first to fourth aspects of the present invention, a rotatable steel ball is provided on the operating rod of the rotational force detecting means, and the operating member is formed of synthetic resin. Therefore, claims 1 to 4
In addition to the effects of the respective inventions described above, it is possible to prevent wear of the operating member and the detection unit, and to operate both of them smoothly, so that the rotational force detecting unit can be operated accurately. Things.

Further, in the invention according to claim 3, since the material having a small coefficient of friction is made of a polyacetal resin for the operating member according to the invention according to claim 1 to claim 5, the invention according to claim 1 to claim 5 is applicable. In addition to the effects, the present invention has an effect that the production of the operating member is easy and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing an entire bicycle with an auxiliary power device according to an embodiment of the present invention.

FIG. 2 is a sectional view of the auxiliary power unit according to the embodiment.

FIG. 3 is a side view of a part of the embodiment, viewed from the left crank side of the auxiliary power unit.

FIG. 4 is a view of the electric auxiliary power unit according to the embodiment as viewed from the front of a vehicle body.

FIG. 5 is a partial cross-sectional view showing a relationship among a reference member, an operating member, and a driving member according to the embodiment.

FIG. 6 is an exploded perspective view showing the configuration of the operating means according to the embodiment.

FIG. 7 is a cross-sectional view of a part of the electric auxiliary power unit of the embodiment from above the vehicle body.

FIG. 8 is a sectional view of the torque sensor according to the embodiment.

FIG. 9 is an electric circuit diagram of the torque sensor.

FIG. 10 is a sectional view of an electric auxiliary power unit described in an application filed by the applicant.

FIG. 11 is a side view on the left crank side of the auxiliary power unit, which is a cross-section of a part of the above application.

FIG. 12 is a partial cross-sectional view showing the relationship between the drive gear, the eccentric plate, and the drive plate of the above application.

[Explanation of symbols]

 Reference Signs List A bicycle with auxiliary power device B bicycle body (body) C auxiliary power device 20 case (storage case) 40 motor 50 reduction mechanism (power transmission means) 70 hollow shaft 80 crankshaft 81 left crank 82 right crank 97 coil spring 100 torque sensor (Turning force detecting means) 140 Operating rod 170 Control means

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yusuke Kinoshita 43 Horiyamashita, Hadano City, Kanagawa Prefecture Tec Hatano Plant

Claims (6)

[Claims] An electric motor, and power transmission means for transmitting a rotational force of the electric motor through an output gear comprising a plurality of gears disposed in a case and having a fitting hole provided at a final stage, A hollow shaft rotatably attached to the case and having a sprocket fitted on one end side to the fitting hole and transmitting treading force to the wheel via a chain on the other end side, and penetrating the hollow shaft. A crankshaft provided with a crank having pedals at both ends and having a one-way clutch at one end side, an operating means operated by rotation of the crankshaft, and an operating rod for detecting the operation of the operating means. A rotational force detecting means for detecting a rotational force applied to the crankshaft; and a control means for controlling the electric motor in accordance with an output of the rotational force detecting means. In a bicycle with an electric assist power device that assists power by controlling the electric motor in accordance with a rotational force applied to a crankshaft, the operating means includes a reference member having a sliding surface including an inclined surface provided on the output gear; A drive member having a cylindrical wall at the center portion surrounding the one-way clutch, the guide member rotating in one direction with the crankshaft via the one-way clutch, and being provided along the axial direction of the crankshaft; And a guided portion disposed between the driving member and the output gear, the sliding surface sliding on the sliding surface, and a guided portion guided by the guide portion. An actuating member provided so as to be slidable in the axial direction while rotating with a spring member, and a spring member disposed between the actuating member and the driving member for urging the sliding surface against the sliding surface. Electric assist characterized by comprising Bicycle with a power unit. 2. The bicycle with an electric auxiliary power unit according to claim 1, wherein said operating member is formed of a material having a small coefficient of friction. 3. The electric assist according to claim 1, wherein the slidable surface of the operating member is formed by an inclined surface which is in surface contact with an inclined surface of a sliding surface provided on a reference member. Powered bicycle. 4. A non-operating operation of the operating member, wherein the reference member has an abutting surface formed of a flat surface orthogonal to the axial direction of the crankshaft and an operating member has an abutting surface which is in contact with the abutting surface. 4. The bicycle with an electric auxiliary power device according to claim 1, wherein the operating member is positioned relative to the reference member by bringing the contact surface into contact with the contact surface in the state. 5. An electric auxiliary power unit according to claim 1, wherein a rotatable steel ball is provided on an operating rod of said torque detecting means, and said operating member is made of synthetic resin. bicycle. 6. A bicycle with an electric auxiliary power device according to claim 1, wherein the material having a small coefficient of friction forming said operating member is a polyacetal resin.