JPH08295283A - Auxiliary power unit for bicycle and bicycle therewith - Google Patents

Abstract

PURPOSE: To make the torque accurately detectable with a few part items by constituting a torque detecting means, detecting the torque to be added to a crankshaft, from a reference member with a sliding part consisting of an incline and a torque detecting member installed as being free of traveling in the axial direction as being subject to a whirl stop in the circumferential direction by the crankshaft. CONSTITUTION: In time of traveling on a flat and a downhill, since torque to be added to a torque detecting member 58 via a crankshaft 80 is less than the specified value, this member 58 is forcibly pressed to a gear 56 by a spring 62, and thereby a projection 58a is situated the deepest part of a recess 57 with an incline 57a of this gear 56, therefore both of them 58 and 56 are almost synchronously rotating, so man power traveling takes place. On the other hand, in time of traveling on an uphill, etc., if an extent of input torque goes beyond the specified value, load is added to a hollow shaft 70 and thereby the torque detecting member 58 rotates speedier than a rotation of the gear 56, and the projection 58c shifts along the incline 57a of the recess 57, making it separate from the gear 56 against a coil spring 62. With this, a proximity switch 25 is tuned on, and an electric motor for auxiliary power is thus driven.

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 auxiliary power unit.

[0002]

2. Description of the Related Art A pedal driven drive system, that is, a drive system driven by human power, and a drive system driven by a power unit such as an electric motor, that is, a drive system driven by power drive, are provided while assisting the drive force of the power unit during human drive. A power-equipped bicycle configured to do so has been known. Such a thing is described in, for example, JP-A-4-358987. The bicycle with an electric motor described in this publication is provided with an electric motor 22 and a power unit 24 in the lower part of the seat tube 16 as described in the publication column 1, line 48 to column 3, line 30. , This electric motor 22
Rotation of the one-way clutch 48, planetary gear type speed reducer 50,
The rear wheel 14 is driven by being transmitted to the drive shaft 30 via the small bevel gear 52, the large bevel gear 54, and the like, and the rotation by human power is input from the pedal 36. The crankshaft 32, the one-way clutch 60, the planetary gears. The rear wheel 14 transmitted to the drive shaft 30 via the gearbox 62, the large bevel gear 54, the tubular shaft 56, and the bevel gear mechanism 58 is driven.

When the driving force of the electric motor 22 is applied to the rear wheel 14 during manpower running, it is detected that the pedaling force of the pedal 36 becomes larger than a certain value, and the electric motor 22 is driven based on this detection. Although it is driven, the detection of the pedaling force of the pedal 36, that is, the driving force is performed by the ring gear 62a fixed to the large bevel gear 54 and the sun gear 62b fixed to the torque detection lever 64 as described in the publication. A planetary gear type speed increaser 62 having a planetary gear 62c interposed between the sun gear 62b and the ring gear 62a is provided, and the driving force at the time of manual driving is the reaction force of the driving force of the pedal 36 applied to the sun gear 62b. As torque detection lever 64
I'm trying to detect. Then, the second lever 6 that comes into contact with the protrusion 64b provided on the torque detection lever 64
8, the second lever 68 is rotated when the torque detecting lever 64 is rotated, and the amount of rotation is detected by the potentiometer 72 to drive the electric motor 22.

By the way, the detection of the pedaling force of the pedal 36, that is, the driving force described in the above publication, is performed by the ring gear 62a,
A planetary gear type speed increaser 62 including a sun gear 62b and a planet gear 62c interposed between the ring gear 62a, a torque detection lever 64 fixed to the sun gear 62b of the planetary gear type speed increaser 62, and a torque detection lever thereof. Since the second lever 68, which is operated by 64, and the return spring 70 of the second lever 68, etc., are configured, the number of components is large and the configuration is complicated, resulting in poor productivity. As a result, there has been a problem that the price is increased.

Further, as described in the above publications, all conventional bicycles with an auxiliary power unit require a dedicated vehicle body for mounting the auxiliary power unit, which is a general-purpose bicycle, that is, a commercially available general-purpose bicycle. It could not be attached to the body of a bicycle. As a result, the bicycle equipped with the auxiliary power unit is expensive, and is not economically satisfactory to the user.

[0006]

As described above, in the conventional power unit of the bicycle with the auxiliary power unit, the detecting unit for detecting the driving force of the pedal during manual running has a large number of constituent parts, and There is a problem in that the structure is complicated, which requires a large number of assembling steps, lowers the productivity, and consequently raises the price.

[0007] In addition, each bicycle with an auxiliary power unit requires a dedicated vehicle body for attaching the auxiliary power unit, which results in high cost and is not satisfactory for the user in terms of economical efficiency. There was a request to provide a bicycle with an auxiliary power unit.

[0008]

SUMMARY OF THE INVENTION The present invention is intended to solve the above problems of the prior art and to meet the demands of users. The invention according to claim 1 is arranged in an electric motor and a case. A power transmission unit that includes a plurality of gears and has a shaft hole formed in the center thereof, and has a power transmission unit that transmits the rotational force of the electric motor to the output gear, and one end rotatably attached to the case via a bearing. A hollow shaft formed with a fitting portion in which the side is fitted in the shaft hole and the sprocket is fitted in the other end, and the hollow shaft is rotatably supported inside the hollow shaft and penetrates the hollow shaft. And a crankshaft having a mounting portion for mounting a crank having pedals at both ends thereof and penetrating the case, a rotational force detecting means for detecting a rotational force applied to the crankshaft, and the rotational force detection Closed according to the operation of the means In the auxiliary power unit for a bicycle, which comprises a switch means for driving the electric motor, the rotational force detecting means is provided with a reference member having a sliding portion formed of an inclined surface in the case, and facing the reference member. Is provided on the crankshaft so as to be rotatable in the axial direction while being prevented from rotating in the circumferential direction, and has a slidable portion facing the sliding portion, and is rotated relative to the reference member within a predetermined range. 3. A bicycle auxiliary power unit comprising a rotating force detecting member, and an urging member for urging the rotating force detecting member and the reference member so as to press-contact each other. According to the invention of claim 1, the auxiliary power unit according to claim 1 is screwed and attached to the screw portions formed on both inner peripheral surfaces of the through holes of the hanger lug provided in the frame of the vehicle body, and the opposite sides are attached to each other. Is obtained by the auxiliary power unit Bicycles attached to the vehicle body via a pair of mounting members having an insertion hole for inserting the hollow shaft into a bottomed cylindrical shape is formed a bottom which is the mouth.

[0009]

According to the invention as set forth in claim 1, in the detecting means for detecting the rotating force of the auxiliary power unit of the bicycle with the auxiliary power unit during the human power traveling, the number of constituent parts is reduced to simplify the configuration and reduce the number of assembling steps. Further, it is possible to provide a detecting means capable of surely detecting the rotational force. Further, according to the invention of claim 2, the auxiliary power unit is attached to a hanger lug provided on the body of a general-purpose bicycle through an attaching member. It can be attached to form a bicycle with an auxiliary power unit.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, one embodiment of the present invention will be described with reference to FIGS. As shown in the figure, an auxiliary power unit-equipped bicycle (hereinafter simply referred to as a bicycle) A includes a bicycle (hereinafter simply referred to as a vehicle body) B and an auxiliary power unit (hereinafter simply referred to as a power unit) C attached to the vehicle body B. It consists of The vehicle body B is composed of a general-purpose bicycle, that is, a general-purpose bicycle that is generally commercially available. The standing pipe 2 and the lower pipe 3 are fixed to the hanger lug 1 at one end side, and are fixed to the other end side of the lower pipe 3. A frame 6 consisting of an upper pipe 5 having one end fixed to the head pipe 4 and the other end fixed to a lower portion of the standing pipe 2; a chain stay 7 having one end fixed to the hanger lug 1; Front fork 8 attached to the head pipe 4,
A handle 9 attached to the upper end of the front hawk 8, a front wheel 10 attached to the lower end of the front hawk 8, one end fixed to the upper portion of the stand pipe 2 and the other end of the chain stay 7 to the other end. Back hawk 11 fixed via the side and rear claws, a rear wheel 12 attached to the other end of the chain stay 7, a saddle 13 attached above the standing pipe 2, and an upper portion of the rear wheel 12. The cargo receiving stand 1
It is composed of 4 etc. The front wheel 10 and the rear wheel 12 are partially covered with covers 10a and 12a, respectively. A crankshaft 80, which will be described later, is rotatably provided on the hanger lug 1, 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 15 is attached to the lower part of the cargo receiving base 14, and the battery case 1
A battery (not shown) is detachably attached to the inside of the unit 5. In addition, this battery and an electric motor 40 described later
And are connected by a lead wire 16. A chain 19 is hung on the sprocket 17 for transmitting the rotational force during traveling and the sprocket 18 of the rear wheel 12.

Next, the structure of the power unit C and how to mount the power unit C on the vehicle body B will be described.

First, the structure of the power unit C will be described with reference to FIGS. 2, 3 and 8. Power unit C as shown
Is an electric motor 40 attached to the case 30, the case 3
0, a power transmission means 50 for transmitting the rotational force of the electric motor 40, a sprocket 17 for transmitting the rotational force of the electric motor 40, a hollow shaft 70 for transmitting to the sprocket 18 of the rear wheel via a chain 19, A crankshaft 80 for transmitting the rotational force from the cranks 81, 82 to the sprocket 18 of the rear wheel 12 via the sprocket 17 and the chain 19 during manual running, to the power transmission means 50 and the crankshaft 80 and the hollow shaft 70. In relation to the hollow shaft 7, the rotational force from the crankshaft 80 and the rotational force, that is, the power from the electric motor 40 transmitted through the power transmission means 50 are assisted.
It is composed of a rotational force detecting means T which is transmitted to the sprocket 17 via 0 and a switch means S which operates according to the operation of the rotational force detecting means T.

The case 30 has an inner case 31 formed in a bottomed shape with one side open, and a bottomed shape in which the other side is also opened with a fitting portion 3 in the opening.
2a is provided in the outer case 32, and the fitting portion 32
The opening edge 31a of the inner case 31 is sealed with a seal packing 3
It is configured to be liquid-tightly fitted via 3a and coupled by a plurality of coupling screws 34a and nuts 34b. The inner case 31 is provided with shaft mounting portions 31b and 31c, which are holes and recesses, a bearing mounting portion 31d, which is a recessed portion, and a concave bearing mounting portion 31h, which is formed with a through hole 31g. 32 is the inner case 3
1, the shaft mounting portions 31b and 31c, and the shaft bearing mounting portion 31d, which correspond to the shaft mounting portions 31b and 31c, respectively.
2b, 32c and a bearing mounting portion 32d are provided, and a recess 32h having a through hole 32g formed corresponding to the through hole 31g of the bearing mounting portion 31h provided in the inner case 31 is provided. There is. The recess 32
A packing 33b is attached to h.

The mounting portion 31f of the inner case 31
7, the output shaft 41 of the electric motor 40 is inserted through the insertion hole 31e and attached by a screw 42. A cover 44 covering the electric motor 40 and a seal packing 43 is provided on the inner case 31 as shown in FIG. It is attached by a screw 44a. A mounting bracket 45 having an abutting portion 45a having an arcuate surface that abuts the lower side surface of the lower pipe 3 is attached to the cover 44. Further, a pulley 51 having a small diameter is provided at the tip of the output shaft 41 with a pin 51a.
It is attached by being stopped by.

Ball bearings 35 are attached to the shaft mounting portions 31b and 32b of the inner case 31 and the outer case 32, respectively.
The shaft 35 to which the large-diameter pulley 52 having the gear 52a is mounted on the inner case 31 side via the a and 35a, and the gear 5 on one end side on the shaft mounting portions 31c and 32c.
The gear 53 having a large diameter gear 53a that meshes with the 2a and the small diameter gear 53b on the other end side is the needle bearing 36a.
A shaft 36 is attached via.
The pulley 51 and the pulley 52 have a belt 51
a is hung. In addition, the bearing mounting portions 31d and 3
2d has ball bearings 37 attached to both ends.
shaft 37 attached by fitting a and 37a
A large-diameter gear 54 that meshes with the small-diameter gear 53b of the gear 53 is attached to one end side of the shaft 37, that is, the outer case 32 side, and the one-way clutch 37c is attached to the other end side. A small-diameter gear 55 is attached via. The one-way clutch 37c is provided so as to idle when the cranks 81 and 82 of the pedals 81a and 82a rotate in the traveling direction during manual traveling described later. Further, a gear 56 as an output gear that outputs the power of the electric motor 40 is provided in mesh with the gear 55. The gear 56 constitutes a reference member.

Then, the pulleys 51 and 52 and the belt 51a, the gear 52a, the gear 53, the gear 54, the gear 55 and the gear 5 which are hung on the pulleys 51 and 52.
The power transmission means 50 is constituted by 6.

The shaft hole 5 is provided at the center of the gear 56.
A cylindrical portion 56b provided with 6a is provided, and on the outer case 32 side of the gear 56, as shown in FIG. 3, the cylindrical portion 56b is concentrically and radially arranged on the outer periphery of the cylindrical portion 56b. A plurality of (six in the example) recesses 57 are formed, and these recesses 57 are in the direction of the arrow shown in FIG.
As shown in FIGS. 4 and 5, an inclined surface 57a is formed which gradually rises upward, that is, toward the surface of the side surface, along the direction in which 6 rotates during traveling. This inclined surface 57a
The recessed portion 57 having a portion constitutes a sliding portion. Further, an uneven line 56c generally called involute serration is formed on the inner peripheral wall of the shaft hole 56a. Further, a plurality of (three in the embodiment) long holes 56d are provided between the adjacent recesses 57 of the gear 56.

A rotating force detecting member 58 is provided on the side of the gear 56 where the concave portion 57 is provided. The rotating force detecting member 58 is a cylindrical portion 58a, and the cylindrical portion 58a has a cylindrical portion 58a. The disc-shaped portion 58b is provided on one end side, that is, the gear 56 side, and an annular detection plate 58e integrally formed on the outer peripheral portion of the disc-shaped portion 58b is provided. A unidirectional clutch 59 is attached to the inner circumference of the tubular portion 58a. A fitting shaft hole 59a having an uneven line 59b is formed on the inner circumference of the one-way clutch 59. The shaft center of the fitting shaft hole 59a is the shaft hole 56a formed in the gear 56. It matches the axis. The one-way clutch 59 is used for the crank 8
When 1 and 82 rotate in the opposite direction to the traveling direction, they run idle. In addition, as shown in FIG. 3, on the side surface of the disk-shaped portion 58b facing the gear 56, the gear 5 is provided.
A plurality of protrusions 58c having an elliptical cross section (six in the embodiment) formed corresponding to the recesses 57 formed in 6 are formed, and the upper ends of the protrusions 58c have a short axis as shown in FIGS. The curved surface portion 58f as an inclined surface is formed along the direction, that is, the circumferential direction. The projection 58c having the curved surface portion, that is, the inclined surface constitutes a sliding portion, that is, a sliding portion that slides along the inclined surface 57a of the concave portion 57. In addition, a plurality of (three in the embodiment) mounting holes 58d are formed in the disk-shaped portion 58b by forming a long axis in the circumferential direction between the protrusions 58c.
Is provided.

Then, a long hole 56d provided in the gear 56
And the mounting hole 58d provided in the disk-shaped portion 58b are made to correspond to each other, and penetrate the long hole 56d and the mounting hole 58d, and are fixedly positioned in the mounting hole 58d and are free to play in the long hole 56d. Hollow cylindrical sleeve 60 that penetrates in the fitted state
, The mounting bolt 61 is inserted inside the sleeve 60, and the coil spring 6 as a biasing member is provided on the outer periphery.
2 is loosely fitted, the coil spring 62 is arranged between the disk-shaped portion 58b and the locking plate 63 fitted on the screw portion side of the mounting bolt 61, and the nut 64 is tightened. Fix it. In this state, the urging force of the coil spring 62 and the side surface of the gear 56 in which the recess 57 is provided and the disk-shaped portion 5 are formed.
The side surface of 8b is in a pressure contact state as shown in FIGS. 4 (A) and 5 (A), and the concave portion 57 and the protrusion 58c are in a completely fitted state as shown in both figures. Has become.

Further, since the sleeve 60 fitted in the mounting hole 58d can move in the long hole 56d of the gear 56 in the longitudinal direction, that is, in the circumferential direction, the rotational force detecting member 58 is within the range of the long hole 56d. It can move with respect to the gear 56. That is, the rotational force detection member 58 and the gear 56 can be relatively moved within the range of the long diameter of the long hole 56d.

The magnitude of the urging force of the coil spring 62 as the urging member is determined by the rotational force applied to the rotational force detecting member 58 via the crankshaft 80 and the one-way clutch 59 when the vehicle travels manually. Is set to a size at which compression is started when exceeds a predetermined value. That is, the rear wheels 12 while traveling
A large load is applied to the pedal 81 to depress against it.
The rotational force generated by a and 82a is applied to the crankshaft 80 via the cranks 81 and 82, so that the rotational force detection member 58 that rotates together with the crankshaft 80 resists the biasing force of the coil spring 62 and the protrusion 58c thereof is generated. The size is set so as to gradually move upward along the inclined surface 57a and separate from the gear 56. That is, when the rotational force of the rotational force detection member 58 that rotates together with the one-way clutch 59 along with the rotation of the crankshaft 80 exceeds a predetermined value during manual running, the protrusion 58c causes the inclined surface 57a of the concave portion 57 to move. Is gradually slid upward and moved to separate from the gear 56. Therefore, when the rotational force applied to the crankshaft 80 is equal to or less than the predetermined value, the rotational force detection member 58 is pressed against the gear 56 by the urging force of the coil spring 62 and maintains this state, and the rotational force detection member 58 is maintained. Will rotate in synchronism with the gear 56.

Then, the gear 56 having the concave portion 57 having the inclined surface 57a and the curved surface portion 58f as the locking surface are provided.
For detecting rotational force and member for detecting rotational force 58
The rotational force detecting means T is constituted by the coil spring 62 for urging the gear 56 and the gear 56 in a pressure contact state.

The operation of switching the rotational force by the rotational force switching means T will be described. As described above, the rotational force from the cranks 81, 82 during traveling causes the rotational force detection member 58 to rotate via the crankshaft 80 and the one-way clutch 59, but the rotational force applied to the rotational force detection member 58 is When the torque is less than the predetermined value, the rotational force detecting member 58 is in pressure contact with the gear 56 due to the urging force of the coil spring 62. Therefore, this rotational force is transmitted to the gear 56 via the rotational force detecting member 58. Further, it is transmitted to the hollow shaft 70, which will be described in detail later, via the gear 56, and when the rotational force exceeds a predetermined value as in the case of traveling on an uphill, the rear wheel 12 receives the torque. A large load is applied, and pedals 81a and 82a are depressed against this.
Is applied to the crankshaft 80 via the cranks 81 and 82, whereby the one-way clutch 5
The rotational speed of the rotational force detection member 58 that rotates with the crankshaft 80 via the gear 56 that rotates with the hollow shaft 70.
Is faster than the rotational speed of the coil spring 62, and the rotational force detection member 58 compresses the coil spring 62 against the biasing force of the coil spring 62.
8c gradually moves upward along the inclined surface 57a to move the gear 5
6 and the detection plate 58e provided on the rotational force detection member 58 along with the separation is attached to the proximity switch 25 described later.
Then, as shown by the chain double-dashed line in FIG. 8, the proximity switch 25 is closed and the electric motor 40 is driven.
Is transmitted to the gear 56, which is an output gear of the power transmission means 50, and is transmitted to the hollow shaft 70 to add or assist the rotational force from the electric motor 40. That is, when the vehicle is traveling on a level ground or a downhill in the case of manpower traveling, the rotational force applied to the rotational force detection member 58 via the crankshaft 80 is less than a predetermined value, so this rotational force is hollow via the gear 56. When the vehicle is transmitted to the shaft 70 for manual driving, and when traveling uphill, a large rotational force is required. As a result, the rotational force applied to the crankshaft 80 and the rotational force detection member 58 exceeds a predetermined value. Then, the rotational force detection member 58 becomes the gear 56.
And the detection plate 58e approaches the proximity switch 25 to drive the electric motor 40, and the rotational force of the electric motor 40 is transmitted to the hollow shaft 70 via the gear 56 as described above, and the electric motor 4 is driven.
Rotational force from 0 is added to, or assisted by, the rotational force generated by human power to drive the vehicle.

Further, the proximity switch 25 as the switch means S is mounted inside the outer case 32 facing the detection plate 58e provided on the rotational force detection member 58 provided on the case 30 by the mounting screw 26a and the nut 26b. It is installed. The proximity switch 25 is connected in series with a power switch (not shown) in an electric circuit (not shown) that electrically connects the battery (not shown) and the electric motor 40. Then, as described above, the proximity switch 25 closes when the detection plate 58e approaches a predetermined distance.

Next, the shaft hole 5 formed in the gear 56
6a to fit the power of the electric motor 40 to the sprocket 1
The hollow shaft 70 transmitted to the shaft 7 will be described. The hollow shaft 70 has a through hole 71 therein and at one end side thereof is formed an uneven line 72 which engages with the uneven line 56c formed in the shaft hole 56a. When the hollow shaft 70 is fitted into the shaft hole 56a, both uneven lines are formed. The engagement of 56c and 72 prevents rotation in the circumferential direction and allows the gear 56 to rotate integrally. Also,
A concavo-convex strip 73 is formed on the outer periphery of the end portion on the other end side, and the concavo-convex strip 73 is formed so as to be aligned with the concavo-convex strip 17b formed on the mounting member 17a to which the sprocket 17 is mounted. The hollow shaft 70 is positioned by a locking member 74a attached to an annular groove 74 formed in the vicinity of the concavo-convex strip 72 formed on the one end side, and is press-fitted and attached to an inner ring of a ball bearing 77. The hollow shaft 70 penetrates a through hole 31g provided in the inner case 31 and an outer ring of the ball bearing 77 is provided in the inner case 31.
It is fixed to the inner case 31 by being pressed into h. An annular groove 75 is formed in the hollow shaft 70 near the annular groove 74, and a washer 75 is formed in the annular groove 75.
A locking member 75a for positioning b is attached.

Next, the crankshaft 80 which is attached by penetrating the through hole 71 of the hollow shaft 70 will be described. A mounting portion 83 including a fitting portion 83a having an outer periphery formed in a prism shape and a screw portion 83b protruding from the fitting portion 83a is provided on one end side of the crankshaft 80, and the other end side is similarly provided. Mounting portions 84 each including a fitting portion 84a whose outer periphery is formed in a prismatic shape and a screw portion 84b protruding from the fitting portion 84a are formed. The mounting portions 83 and 84 are formed in a shape and size that match the fitting portions 81b and 82b of the left crank 81 and the right crank 82 of the general-purpose bicycle.

A large diameter portion 85 is provided on the crankshaft 80 adjacent to the inside of the mounting portion 83 on the one end side, and the one-way clutch 59 is provided on the outer periphery of the large diameter portion 85. The formed ridges and grooves 59a and the ridges and grooves 85 that are engaged with each other so as to be movable in the axial direction and to prevent rotation in the circumferential direction
a is formed, and the axial length of the uneven strip 85a moves in the direction in which the rotational force detection member 58 separates from the gear 56 when the rotational force applied to the crankshaft 80 exceeds a predetermined value. The length of the unidirectional clutch 59, which moves with this movement, is set longer than the axial length of the ridge 59a so that the ridge 59a of the one-way clutch 59 engages with the ridge 85a over the entire axial length thereof. There is.

2 and 8 from the large-diameter portion 85.
In the right direction, there is a small-diameter portion 86 having a smaller diameter than the large-diameter portion 85, and the small-diameter portion 86 has the large-diameter portion 85.
Bearing fitting portions 87a and 87b are provided in a portion adjacent to the above and a portion located inside the mounting portion 84, respectively. 2 and 8, the bearing fitting portion 87
Annular grooves 90 and 91 are provided on the right side of a and the left side of the bearing fitting portion 87b, respectively. As shown in FIG. 8, a washer 92a is provided on the side surface of the large-diameter portion 85 via a spacer 92, and the bearing fitting portion 87 is provided.
Bearings 9a and 87b are needle bearings.
3a and 93b are attached, and the bearing 93a is a washer 90b axially retained by a locking member 90a fitted in the annular groove 90 and the washer 9
And 2a. Also, the bearing 93b
The lock member 91a is attached so that the locking member 91a fitted in the annular groove 91 blocks the inward movement in the axial direction by the washer 91b, which is prevented from moving inward in the axial direction. A washer 85b is arranged on the left side of the large diameter portion 85 in FIGS. 2 and 8. Further, an annular groove 94 is provided in the vicinity of the mounting portion 84 of the small diameter portion 86, and a washer 94b is attached to the annular groove 94 so as not to come off by a locking member 94a.

The power unit C is constructed as described above. Here, the assembly of the power unit C will be described.

First, the washer 92a, the bearing 93a, and the washer 90b are previously inserted into the crankshaft 80 in this order, the locking member 90a is fitted into the annular groove 90, and the bearing 93a is attached to the bearing fitting portion 87a. Annular groove 9
1. After fitting the locking member 91a into 1, the washer 91b
The bearing 93b is fitted and fitted to the bearing fitting portion 87b, and then the uneven strip 59a of the one-way clutch 59 having the rotational force detecting member 58 attached to the uneven strip 85a of the large diameter portion 85 is fitted. Attached, and crankshaft 8
0 from the mounting portion 84 side, the gear 56 is inserted, the washer 92a is positioned in between, and the mounting hole 58d and the long hole 56 are inserted.
The sleeve 60 in which the rotational force detecting member 58 and the gear 56 are aligned in correspondence with d and the bolt 61 is inserted in this state
Is inserted through the mounting hole 58d of the rotational force detecting member 58 from the long hole 56d side of the gear 56, then the coil spring 62 is fitted in the sleeve 60 and the nut 6 is inserted through the locking plate 63.
Prepare with 4 attached. In addition, the output shaft 41
An electric motor 40 having a pulley 51 attached thereto is prepared.

The bearing mounting portion 3 of the inner case 31
The outer ring of the ball bearing 77 is press-fitted and fixed to 1h,
The hollow shaft 70 having the positioning member 74a attached to the annular groove 74 is press-fitted into the inner ring of the ball bearing 77. Then, in the through hole 71 of the hollow shaft 70, the bearing 93a,
93b, the gear 56, and the crankshaft 80 to which the rotational force detection member 58 is attached penetrates and is attached. Further, the output shaft 41 of the electric motor 40 is passed through the through hole 31e, and the electric motor 40 is attached to the attaching portion 31f with the screw 42.
4 is attached via packing 43.

Next, the shaft 36 having the gear 53 attached to the inner case 31, the shaft 35 having the pulley 52 attached, and the gear 5
One end side of each of the shafts 37 having the shafts 4 and 55 attached thereto is mounted on the shaft mounting portion 31c, the shaft mounting portion 31b, and the bearing mounting portion 31d. Further, a washer 85b is inserted into the crankshaft 80 from the side of the mounting portion 83. Further, the belt 51a is stretched over the pulley 51 and the pulley 52.

Further, the proximity switch 25 is attached to the outer case 32, and the packings 33a and 33b are attached to the fitting portion 32a and the recess 32h. Then, the outer case 32 is covered with the through hole 32g, the bearing mounting portion 32d,
The crankshaft 80, the shaft 37, the shaft 36, and the shaft 3 in which the shaft mounting portion 32c and the shaft mounting portion 32b are mounted on the inner case 31.
5, the fitting portion 32a is fitted to the opening edge 31a of the inner case 31 and is coupled by the mounting screw 34a and the nut 34b, whereby the power plant C is assembled. Thus, in the assembled state, as shown in FIGS. 2 and 8, the detection plate 58e of the rotational force detection member 58 and the proximity switch 25 face each other with a predetermined distance therebetween. An overall perspective view of the power unit C assembled in this manner is shown in FIG.

Next, as described above, the attachment members 110 and 120 which are attached to the female screws 1b and 1c, which are the screw portions formed on the inner peripheral walls at both ends of the through hole 1a of the hanger lug 1 of the body B of the general-purpose bicycle A, respectively. Will be described.

First, the mounting member 110 has one end (see FIG. 2).
Is formed in a bottomed tubular shape having an opening on the right side), a through hole 112 is provided in the bottom wall 111, and the tubular portion 11
On the outer peripheral wall of 3, there is formed a male screw 114 that is screwed into the female screw 1b formed in the through hole 1a of the hanger lug 1, and inside the cylindrical portion 113, a bearing 115 consisting of a needle bearing is formed from the opening. It is inserted and attached. Further, the flange portion 1 is provided on the outer periphery of the bottom wall 111.
16 are formed. The mounting member 110 is mounted on the hanger lug 1 by accommodating the bearing 115 inside the cylinder upper portion 113 and then screwing the bearing 115 into the female screw 1b. At this time, the flange portion 116 is attached to the hanger lug 1.
It comes in contact with the end portion on one end side.

Next, the mounting member 120 is formed in a bottomed cylindrical shape with one end open on the left side in FIGS. 2 and 8, a through hole 122 is provided in the bottom wall 121 thereof, and the cylindrical portion 123 has a cylindrical shape. The outer peripheral wall is formed with a male screw 124 that is screwed into the female screw 1c on one end side of the through hole 1a of the hanger lug 1, and a bearing 125, which is a needle bearing, is inserted from the opening inside the cylindrical portion 123. Installed. Then, the mounting member 120 has the tubular portion 1
After housing the bearing 125 inside 23, it is screwed and attached to the female screw 1c.

The mounting members 11 mounted on both ends of the hanger lug 1 with their openings facing each other.
The restriction member 130 is provided between the 0 and 120 and inserted into the hollow shaft 70. This regulating member 1
Reference numeral 30 is composed of a tubular portion 131 that penetrates the hollow shaft 70, and annular collars 132 and 133 as restricting portions provided at both ends of the tubular portion 131. The axial length of the tubular portion 131 is such that the annular flanges 132 and 133 are located near the respective openings of the attachment members 110 and 120 when attached to the hollow shaft 70. It is set. Therefore, the bearings 115 and 125 housed in the tubular portions 113 and 123 of the two mounting members 110 and 120, respectively, are prevented from moving in the axial direction by the annular collars 132 and 133 and come out of the tubular portions 113 and 123. There is no such thing. The restricting member 130 is attached by, for example, attaching the attaching member 110 to the female screw 1b of the through hole 1a of the hanger lug 1 and then inserting the restricting member 130 into the through hole 1a from the female screw 1c side of the through hole 1a. This is done by attaching the attachment member 120 to the female screw 1c. Further, the mounting member 120 can be securely mounted by mounting the mounting member 120 on the female screw 1c and then screwing a nut 136 onto a male screw provided on the outer periphery of the cylindrical portion 123.

As described above, the bearing members 115 and 125 of the mounting members 110 and 120 mounted on both ends of the hanger lug 1 by disposing the regulating member 130 in the through hole 1a of the hanger lug 1 have the power unit C of the power unit C. A hollow shaft 70 protruding from the inner case 31 is inserted. The hollow shaft 70 is restricted from moving to the right in FIGS. 2 and 8 by the outer surface of the bottom wall 111 of the mounting member 110 by the washer 75b positioned by the locking member 75a fitted in the annular groove 75. ing. Also,
The leftward movement in FIGS. 2 and 8 is restricted by the washer 76b positioned by the locking member 76a fitted in the annular groove 76 provided in the hollow shaft 70 at a position close to the uneven line 73. That is, the hollow shaft 7
When No. 0 is attached to the hanger lug 1, movement of more than a predetermined clearance in the axial direction is restricted by the washers 75b and 76b.

Further, as shown in FIGS. 2 and 8, the sprocket 17 is fitted with the uneven line 17b provided on the bearing portion 17a thereof into the uneven line 73 of the hollow shaft 70 protruding through the through hole 1a. It is installed. When the sprocket 17 is mounted on the hollow shaft 70, the sprocket 17 is axially moved by the washer 94b positioned by the locking member 76a and the locking member 94a fitted in the annular groove 94 provided in the crankshaft 80. It is attached so that it does not come off.

Then, the mounting portion 83 of the crankshaft 80
The left crank 81 to which the pedal 81a is attached is attached by fitting the fitting portion 81b of the left crank 81 to the fitting portion 83a of the mounting portion 83 and fastening with the nut 140. Similarly, the right crank 82 having the pedal 82a attached to the mounting portion 84 of the crankshaft 80 is fitted with the fitting portion 82b thereof into the fitting portion 84a of the mounting portion 84, and is fastened by the nut 141. It is installed.

The chain 19 hung between the sprocket 17 and the sprocket 18 is covered with a cover 20.

Next, how to mount the assembled power unit C on the body B of a bicycle, that is, a general-purpose bicycle will be described.

First, although not shown, a body B of a general-purpose bicycle
The cranks (left crank 81 and right crank 82 in the embodiment) attached to the crank shaft of No. 1 are removed from the crank shaft, and then the left and right doggies attached to the left and right of the hanger lug are removed from the hanger lug to form the hanger lug. Remove all other installed parts. The hanger lug 1 in this state is the hanger lug 1 shown in the above embodiment.

Next, the mounting member 110 accommodating the bearing 115 is mounted on the female screw 1b formed on the inner peripheral wall on one end side of the hanger lug 1, and then the regulating member 130 is fitted through the through hole 1a.
Female screw 1c formed on the inner peripheral wall on the other end side after being inserted into
The mounting member 120 accommodating the bearing 125 is mounted on.
Then, from the annular groove 76, the locking member 76a and the washer 7 are inserted.
As shown in FIG. 6, the hollow shaft 70 with 6b removed is inserted from the left side in FIG. 2, the hollow shaft 70 is rotatably attached to the bearings 115 and 125, and then the washer 76b is attached to the hollow shaft 70. The locking member 76a is fitted into the fitting groove 76 and attached. In this state, the hollow shaft 70 is attached to the hanger lug 1 with its axial movement restricted by the washers 75b and 76b.

When the hollow shaft 70 is attached to the hanger lug 1, the power unit C is rotatably attached to the hanger lug 1 by the ball bearing 77 via the hollow shaft 70. From this state, the power unit C is rotated clockwise in FIG.
The abutting portion 45a of the mounting metal fitting 45 attached to the cover 44 covering the above is brought into contact with the lower pipe 3, and the fastening metal fitting 46 for sandwiching the lower pipe 3 so as to face the mounting metal fitting 45 has two screws 47. , 47 and tighten. As a result, the power plant C is inserted into the hanger lug 1 and attached to the hollow shaft 70 and the lower pipe 3, and the attachment fitting 45 and the fastening fitting 46 are attached.
With the cover 44 attached by and the vehicle body B
Fixedly attached to

After the power unit C is attached to the vehicle body B, the left crank 81 and the right crank 82 are attached to the attachment portions 83 and 84 of the crank shaft 80 to complete all the assembling.

Next, the operation of the bicycle with the auxiliary power unit configured as described above will be described. First, a power switch connected in series with the proximity switch 25 is closed in an electric circuit that connects a battery (not shown) housed in the battery case 15 (not shown) to the electric motor 40.

Then, ride on a bicycle and drive. And
When traveling on a flat ground or a downhill, the rotational force applied to the rotational force detection member 58 via the crankshaft 80 is equal to or less than a predetermined value as described above, and therefore, the rotational force detection member 58 is used.
Is pressed against the gear 56 by the urging force of the coil spring 62. As shown in FIGS. 4A and 5A, the protrusion 58c having the curved surface portion 58f of the rotational force detecting member 58 moves the inclined surface 57a of the gear 56. Since it is located at the deepest part of the recess 57, it rotates in synchronization with the rotational force detection member 58 and the gear 56, and the rotational force of the crankshaft 80 is transmitted to the hollow shaft 70 via the gear 56. Manual driving is done. Further, when traveling uphill, a large rotational force is required, and as a result, the rotational force applied to the crankshaft 80 and the rotational force detection member 58 exceeds a predetermined value. That is, since the load is applied to the hollow shaft 70 that transmits the rotational force to the sprocket 18 that transmits the rear wheel 12 via the chain 19, the rotational force detection member 58 rotates faster than the rotation of the gear 56. Will be
As a result, as shown in FIG. 4B and FIG.
8c moves along the inclined surface 57a of the concave portion 57 of the gear 56 and resists the biasing force of the coil spring 62, and separates from the gear 56 as shown by a two-dot chain line in FIGS. As a result, the detection plate 58e gradually approaches the proximity switch 25, and when the detection plate 58e approaches a predetermined distance, the proximity switch 25 closes to close the electric motor 40.
Drive. When the electric motor 40 is driven, this rotational force is transmitted to the hollow shaft 70 via the gear 56 which is an output gear of the power transmission means 50. As a result, the gear 56 has a crankshaft 8
The rotational force due to human power transmitted via 0 and the rotational force from the power unit C, that is, the electric motor 40 are synergistically added, and the synergistic rotational force results in the hollow shaft 70 and the sprocket 1.
It is transmitted to the rear wheel 12 via the 7, the chain 19 and the sprocket 18. That is, when the load applied to the crankshaft 80 becomes large as when traveling uphill, as described above, the rotational force from the power unit C is added to the rotational force by the human power, that is, when the vehicle travels manually. In addition, the rotational force is assisted by the power unit C, so that the vehicle can travel easily even on an uphill road.

Then, when the vehicle again travels on a level ground or the like, the rotational force detecting member 58 is driven by the biasing force of the coil spring 62.
6 is brought into a pressure contact state and both rotate substantially in synchronization, the detection plate 58e is separated from the proximity switch 25, the proximity switch 25 is opened, and the electric motor 40 is stopped. That is, the assistance of the rotational force from the power unit C is cut off, and the vehicle is driven only by the rotational force by human power.

As described above, the bicycle with the auxiliary power unit is operated by human power when traveling on a level ground or a downhill where the load applied to the rear wheels 12 is relatively small during traveling and can be easily operated. When the load applied to the rear wheels 12 is large and a large rotational force is required for driving, such as when traveling uphill, the rotational force generated by human power should be added to assist the rotational force of the power unit C, that is, the electric motor 40. It can be done. And while driving, pedal 8
Rotational force detection means T for detecting that the rotational force applied to the crankshaft 80 via 1a and 82a exceeds a predetermined value is provided so as to be axially movable while being prevented from rotating by the crankshaft 80, and to be slid. Force detecting member 5 having parts
8, the gear 56 as a reference member having a sliding portion, and the coil spring 62 as an urging member that presses both of them together. Therefore, the number of parts can be reduced as compared with the conventional one. This makes it easy to assemble. In addition, the rotational force from the crankshaft 80 can be efficiently transmitted to the rotational force detection member 58 as compared with a conventional planetary gear type gearbox using a large number of gears, and therefore the detection operation can be performed reliably and accurately. It is done.

Further, in the above embodiment, the protrusion 58c of the rotational force detecting member 58 has an elliptical cross section, and the tip end thereof is the gear 56.
Since the linear contact is made in the radial direction with the concave portion 57 and the inclined surface 57a of the crankshaft 80, it is possible to prevent the rotational force detection member 58 from tilting when moving in the direction away from the gear 56. It is possible to smooth the axial movement of 85 and prevent an inaccurate approach operation to the proximity switch 25.

In the above embodiment, in order to return the rotational force detecting member 58 from the state of rotating in the direction away from the gear 56, in addition to the coil spring 62, the rotational force detecting member 58 is returned in the returning direction. If a return spring that rotates is provided between the rotational force detection member 58 and the gear 56, for example, the rotational force detection member 58 can be reliably and smoothly returned to its original position.

Further, the power unit C can be easily and surely attached to the hanger lug 1 through the attaching members 110 and 120 without any modification to the general-purpose bicycle.

In the above embodiment, the torque detecting means T
The rotational force detecting member 58 and the gear 56, which are included in the gear 56, are separated from each other, and the curved portion 58f provided on the sliding force formed by the concave portion 57 provided with the inclined surface 57a provided on the gear 56 and the turning force detecting member 58. It is composed of a slidable portion consisting of a protrusion 58c having a ridge 58c, which is a concave portion 157 having an inclined surface 157a formed on the gear 56 and a protrusion 158 having an inclined surface 158a corresponding to the concave portion 157 as shown in FIG. When the rotational force applied to the crankshaft 80 exceeds a predetermined value and the rotational speed of the rotational force detection member 58 relative to the gear 56 becomes relatively high, the sliding portion and the slidable portion are respectively constituted by and. Alternatively, as shown in FIG. 9B, the rotational force detection member 58 may be separated from the gear 56, and may be restored by the coil spring 62 when the rotational force detection member 58 reaches a predetermined value or less.

Further, as shown in FIG. 10, the rotational force detecting means T has a male screw 156 formed on the outer periphery of the cylinder upper portion 56b of the gear 56, and has a thread groove inclined in the circumferential direction of the male screw 156 and having an inclined surface 156a. A sliding portion is formed, and a female screw 158 to be screwed into the male screw 156 is formed on the rotational force detecting member 58. A thread groove inclined in the circumferential direction of the female screw 158 is used as the slidable surface 158a, and the gear 56 The return of the rotational force detection member 58 separated from may be performed by the coil spring 62. In FIG. 10, the same parts as those in the above embodiment are designated by the same reference numerals.

The torque detecting means T has a male screw 280 formed on the outer circumference of the crankshaft 80 as shown in FIG.
The thread groove inclined in the circumferential direction of the male screw 280 is formed into the inclined surface 2
Also, the sliding portion having 80a, and the rotational force detection member 58
A female screw 259 that is screwed into the male screw 280 is formed on the inner periphery of the one-way clutch 259 integrally attached to the slant surface 15 of the female screw 259.
The sliding portion having 8a may be used, and the rotational force detection member 58 may be returned by the coil spring 62. In FIG. 11, the same parts as those in the above embodiment are designated by the same reference numerals.

[0057]

According to the invention of claim 1 configured as described above, the detecting means for detecting the rotational force of the auxiliary power unit of the bicycle with the auxiliary power unit during the human power traveling is configured by reducing the number of constituent parts. It can be used as a detection means that simplifies the operation and reduces the number of assembly steps, and it can rotate the rotational force from the crankshaft more efficiently than a conventional planetary gear type gearbox that uses a large number of gears. Since it can be transmitted to the force detection member, it has the effect that the detection operation can be performed reliably and accurately.
According to a second aspect of the present invention, in addition to the function of the first aspect, the auxiliary power unit is attached to the general-purpose bicycle through the inside of the mounting member attached to the hanger lug to provide an inexpensive bicycle with the auxiliary power unit. It has the effect of being able to.

[Brief description of drawings]

FIG. 1 is a diagram showing an entire bicycle with an auxiliary power unit of the present invention.

FIG. 2 is a cross-sectional view showing a state in which a power unit is attached to the vehicle body of the above-described embodiment (a developed cross-sectional view developed by a straight line passing through an output shaft of each electric motor, a gear, and a crank shaft).

FIG. 3 is a view showing a mounting state of the power unit on a vehicle body, which is a partial cross-section of the embodiment.

FIG. 4 is a partially sectional perspective view showing a relationship between a sliding portion and a sliding portion of the rotational force detecting means of the above embodiment.

FIG. 5 is a partial cross-sectional view showing a relationship between a sliding portion and a sliding portion of the rotational force detecting means of the above embodiment.

FIG. 6 is an exploded view showing how to mount the power unit and the vehicle body of the above embodiment.

FIG. 7 is an overall perspective view of the power plant of the above embodiment.

FIG. 8 is a partially enlarged view showing a state in which the power unit of the above-described embodiment is attached to a vehicle body.

FIG. 9 is a view showing another embodiment of the rotational force detecting means of the above embodiment.

FIG. 10 is a view showing another embodiment of the rotational force detecting means of the above embodiment.

FIG. 11 is a view showing another embodiment of the rotational force detecting means of the above embodiment.

[Explanation of symbols]

 A bicycle with auxiliary power unit B bicycle (car body) 1 hanger lug 25 proximity switch (part of detection means S) 30 case 40 electric motor 50 power transmission means 56 output gear (part of rotation force detection means T) 57 recess (sliding) 57a inclined surface 58 rotational force detection member (part of rotational force detection means T) 58c protrusion (sliding portion) 58e detection plate (part of detection means S) 58f curved surface portion (inclined surface) 70 hollow shaft 80 Crankshaft 81 Left crank 82 Right crank 110, 120 Mounting member

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yusuke Kinoshita 43 Horiyamashita, Hadano City, Kanagawa Prefecture Tec Hadano Factory

Claims (2)

[Claims] 1. A power transmission means for transmitting a rotational force of the electric motor to the output gear, the output gear including a plurality of gears arranged in a case and having a shaft hole formed in a central portion thereof. A hollow shaft having a fitting portion rotatably attached to the case via a bearing, one end of which is fitted into the shaft hole and the other end of which is fitted with a sprocket, and a hollow shaft inside the hollow shaft. A crank shaft rotatably supported and penetrating the hollow shaft, having a mounting portion for mounting a crank having pedals at both ends, and a crank shaft penetrating the case, and a rotation applied to the crank shaft. In a bicycle auxiliary power unit comprising a rotational force detecting means for detecting force, and a switch means for performing a closing operation to drive the electric motor according to the operation of the rotational force detecting means, the rotational force detecting means is provided in a case. Set up A reference member having a sliding portion formed of an inclined surface, and a slide member that is provided so as to be movable in the axial direction while facing the reference member while being prevented from rotating by the crankshaft in the circumferential direction and facing the sliding portion. A rotational force detecting member that has a moving portion and rotates relatively within a predetermined range with respect to the reference member; and an urging member that urges the rotational force detecting member and the reference member to press each other. An auxiliary power unit for a bicycle, characterized in that 2. The bottomed body, wherein the auxiliary power unit is screwed and attached to screw portions formed on both inner peripheral surfaces of through holes of a hanger lug provided in a frame of a vehicle body, and the opposite sides are opened. A bicycle with an auxiliary power device, characterized in that the bicycle is attached to a vehicle body through a pair of attachment members formed in a tubular shape and having an insertion hole through which the hollow shaft is inserted at the bottom.