JPH0648369A - Motor-driven transmission for bicycle - Google Patents

Abstract

PURPOSE:To prevent the shift of a speed shift position by providing an inner provision type transmission in a rear wheel hub, conducting the connection of its operation mechanism through a motor supported at a case fitted to the rear fork of a bicycle and a gear. CONSTITUTION:An inner provision type rear transmission 10 is provided in the hub 5a of a rear wheel 5, and the connection of its changeover arm 14 is made through a speed shift motor 19 driven by shift switch operation and a deceleration gear mechanism 20. That is, when drive is carried out by the motor 19 and the shift switch operation, the changeover arm 14, in response to this, is actuated through the deceleration gear mechanism 20 and speed shift is conducted. This speed shift motor 19 is supported by means of a case 18 fitted to the rear fork 6 of a bicycle. As a result, an operation wire or the like becomes unnecessary, and the generation of the shift of a displacement position due to its stretch is removed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bicycle electric transmission in which a drive source is a motor.

[0002]

2. Description of the Related Art Conventionally, as a bicycle transmission, for example, as shown in Japanese Patent Publication No. 58-57351, there is a structure in which a transmission is driven by a motor. In the transmission shown in this publication, a transmission having a structure in which a chain is moved to change a winding diameter is arranged at a hub portion of a rear wheel.
A shift cable for operating the transmission was connected to the shift motor.

The shifting motor is housed in a control box together with a battery and is mounted on the side of the rear carrier.
The output shaft of this gear shifting motor was oriented in the vehicle width direction and was connected to the gear shifting cable pulley via a spur gear. The transmission is configured such that the shift motor mounted on the handle operates the shift motor to shift the transmission.

[0004]

However, in the transmission thus constructed, there is a problem that the moving position of the chain is likely to deviate from the desired shifting position when used for a long period of time. This is because the speed change wire interposed on the power transmission path between the speed change motor and the transmission is fatigued and stretched.

[0005]

According to a first aspect of the present invention, there is provided an electric transmission for a bicycle, wherein an internal transmission is disposed in a hub of rear wheels, and an operating mechanism of the internal transmission has a shift switch operation. Is connected with a speed change motor that is driven according to
The motor is supported by a case attached to a rear fork of the frame and is connected to the operation mechanism via a gear.

In the electric transmission of a bicycle according to the second aspect of the invention, a chain guide for rewinding the chain around a plurality of chain rings provided on the hub of the rear wheel is mounted on the frame via a power unit. The unit has a case in which a speed change motor driven according to a shift switch operation is mounted and is fixed to a frame, and one end of the case is pivotally supported and the other end thereof is connected to the chain guide to rewind the chain. A parallel link for moving the chain guide along the direction, and the case side end of the parallel link is connected to the motor via a gear.

[0007]

The shifting motor and the shifting member of the transmission are connected only via the gear type power transmission member.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the first invention will be described below with reference to FIGS.
It will be described in detail by. FIG. 1 is a side view of a bicycle equipped with an electric transmission according to the first invention, FIG. 2 is a view showing a main part of the electric transmission according to the first invention, and FIG. 9B is a sectional view taken along line BB in FIG. 9A, and FIG. 9C is a sectional view taken along line CC in FIG. FIG. 3 is a plan view showing a front transmission partially broken away, and FIG. 4 is a side view of the same.

In these drawings, reference numeral 1 denotes a bicycle equipped with the device of this embodiment. This bicycle 1 has a body frame 2
A front fork 4 that rotatably supports the front wheel 3 is pivotally supported at the front part of the vehicle, and a rear fork 6 with a built-in drive shaft that rotatably supports the rear wheel 5 is provided at the rear part of the vehicle body frame 2. In addition, 7 is a saddle and 8 is a steering handle.

Reference numeral 9 is an electric transmission according to the first invention. The electric transmission 9 includes an internal rear transmission 10 provided at a hub portion of the rear wheel 5, a power unit 11 for driving the rear transmission 10 by a motor, the power unit 11 and a front transmission described later. And a controller 12 for controlling the operation of the power unit.

The rear transmission 10 is shown in FIGS.
As shown in (c), a shift gear train (not shown) housed in the hub 5a of the rear wheel 5 and arranged around the rear wheel shaft 5b, and this shift gear train is switched to a predetermined shift position. It is composed of a switching mechanism 13. This switching mechanism 13
Is a switching rod 1 slidably inserted in the rear wheel shaft 5b.
3a is configured to be pushed by the pressing portion 14a of the switching arm 14 against the spring force of a rod biasing spring (not shown) in the rear wheel shaft 5b.

The switching arm 14 is rotatably supported by a support bracket 15 that supports the rear wheel shaft 5b via a rotary shaft 14b. The support bracket 15 is fixed to the left rear fork 6 of the frame 2. The rotating shaft 14b is rotatably supported by a support bracket 15 with its axis oriented in the vertical direction, and has a switching arm 14 at its lower end.
Is fixed and a reduction gear mechanism of a power unit, which will be described later, is connected to the upper end portion.

A rear detection device 16 for detecting the shift position of the rear transmission 10 is disposed near the switching mechanism 13. The rear detection device 16 is provided with the switching arm 14
A drive gear 16a integrally formed with the drive gear 16a, a driven gear 16b meshing with the drive gear 16a, and a sensor 17 screwed to the lower surface of the support bracket 15. The input shaft of the sensor 17 To the driven gear 1
6b is fixed.

The sensor 17 has a structure in which the electric resistance of the internal circuit changes when the rotational position of the input shaft changes. That is, the sensor 17 is the switching arm 1
4 is connected via a speed-increasing gear consisting of a drive gear 16a and a driven gear 16b to output a detection signal corresponding to the rotation angle of the switching arm 14, in other words, the shift position of the rear transmission 10. Become.

The power unit 11 is constructed by mounting a motor 19 and a reduction gear mechanism 20 in a case 18 formed integrally with the support bracket 15.

The output shaft 19a of the motor 19 is arranged substantially in the front-rear direction of the vehicle body, and the worm 21 is fixed to the output shaft 19a. In addition, the reduction gear mechanism 20
Is a worm wheel 22 that meshes with the worm 21.
A first spur gear 23 that is coaxial with the worm wheel 22 and rotates the same; a second spur gear 24 that meshes with the first spur gear 23; and a second spur gear 24 that is coaxial with the worm wheel 22. And the third spur gear 25 that rotates in the same direction
It is composed of a fourth spur gear 26 and the like that mesh with the spur gear 25. Then, the fourth spur gear 26 is connected to the rotary shaft 14
It is fixed to b.

That is, in the power unit 11, the output shaft 19 of the motor 19 rotates from the worm 21 to the worm wheel 22, the first spur gear 23, the second spur gear 24,
The rotary shaft 1 via the third spur gear 25 and the fourth spur gear 26.
It will be transmitted to 4b.

The controller 12 controls the frame 2
Case 12a fixed to the seat tube 2a, and a cover 12b openably and closably attached to the case 12a
A control circuit (not shown) and a battery serving as a power supply for the transmission are housed in a housing formed by. The control circuit is connected to a shift switch 27 attached to the steering handle 8 and is configured to control the motor 19 of the power unit 11 in accordance with the instructed shift speed input by the shift switch 27. Note that this control is performed by the rear transmission 10 detected by the sensor 17.
The motor 19 is driven until the actual shift speed in (1) matches the designated shift speed.

In addition to controlling the gear shift in the rear transmission 10, the controller 12 controls the frame 2 as well.
Is configured to control the gear shift in the internal front transmission provided in the hanger portion 28 of the vehicle.

Reference numeral 31 denotes an internal front transmission. The front transmission 31 is mounted inside a hanger portion 28 that rotatably supports a crankshaft 32, and is motor-driven by a power unit 33 described later. It is considered as a structure. As shown in FIGS. 3 and 4, the front transmission 31 has a casing 2 formed by dividing the hanger portion 28 into left and right parts.
8a, 28b, a crankshaft 32 fixed to both ends with cranks 32a with foot pedals, a carrier 34 fixed to the crankshaft 32, and a driven rotation rotatably mounted on the crankshaft 32. Body 35,
Three sets of planetary gears 36 axially supported by the carrier 34,
The planetary gear 36 is arranged around the crankshaft 32.
Of the three sun gears 37 that mesh with each other, and these sun gears 3
7 and a switching mechanism 38 for fixing any one of them.

Further, 39 is a drive shaft for transmitting the output of the front transmission 31 to the rear transmission 10. The drive shaft 39 is built in the right rear fork 6, and the rear fork 6 is provided.
It is rotatably supported by. And this drive shaft 39
Bevel gear 39a is fixed to the tip of the bevel gear 39a
Is an output gear 35 formed on the outer surface of the driven rotor 35.
It meshes with a.

The speed change cylinder 38 of the switching mechanism 38
A front end portion of a switching lever 38b for rotating a is connected to a power unit 33 described later. Reference numeral 40 denotes an urging spring for urging the switching lever 38b to the initial position counterclockwise in FIG. 4, which is interposed between the switching lever 38b and the fixed bracket 41. The initial position of the switching lever 38b means the position where the end surface 38c of the switching lever 38b is in contact with the stopper 41a of the fixed bracket 41.

A front detecting device 42 for detecting the shift position of the front transmission 31 is arranged at the rear end of the switching lever 38b. This front detection device 42
Is composed of a fan-shaped drive gear 42a that is bolted to the switching lever 38b, a driven gear 42b that meshes with the drive gear 42a, and a sensor 43 that is fixed to the outer surface of the casing 28a. The driven gear 42b is fixed to the shaft.

The sensor 43 is the same as the sensor 17 mounted on the rear transmission 10, and outputs a detection signal corresponding to the rotation angle of the switching lever 38b, that is, the shift position of the front transmission 31. Is configured to.

The power unit 33 includes a hanger portion 28.
A case 44 integrally formed with the hanger portion 28 by being screwed to the front portion of the motor, a motor 45 mounted in the case 44, an output shaft 45a of the motor 45, and the switching lever 38b are connected to each other. It is composed of a reduction gear mechanism 46 and the like. The motor 45 has an output shaft 45a.
Is mounted with its axis parallel to the crankshaft 32 so as to face the left side of the vehicle body.

The reduction gear mechanism 46 includes the output shaft 45.
The first spur gear 47 that meshes with the pinion 45b of a and the second spur gear 47 that is provided coaxially with the first spur gear 47 and that rotates in the same direction.
The fourth spur gear includes a spur gear 48, a third spur gear 49 that meshes with the second spur gear 48, and a fourth spur gear 50 that is coaxial with the third spur gear 49 and rotates the same. Fifty
Engages with the fan-shaped gear 38d of the switching lever 38b.
The rotating shaft of each gear is rotatably supported by a case 44 and a support member 44a provided in the case 44 as shown in FIG.

In the power unit 33 thus constructed, the output shaft 45a of the motor 45 is rotated by the pinion 45.
b to the first spur gear 47, the second spur gear 48, the third spur gear 4
It is transmitted to the switching lever 38b via the ninth and fourth spur gears 50.

Electric transmission 9 constructed as described above
Then, when the shift switch 27 is operated, the front transmission 3
The power units 33 and 11 of the first and rear transmissions 10 are respectively controlled by the controller 12 to perform gear shifting operations.

Therefore, in the electric transmission 9 according to the first aspect of the present invention, the motor 19 for driving the rear transmission 10 and the rear transmission 10 are gear type power transmission members (the reduction gear mechanism 2).
Since it is connected only through 0), there is no member whose length changes in the power transmission path.

When the motor 45 for driving the front transmission 31 is mounted so that its output shaft 45a is parallel to the crankshaft 32 as shown in this embodiment, the hanger portion 28 of the power unit 33 is connected to the vehicle body. The size of the portion projecting forward can be made relatively short. In addition, the motor 19 for driving the rear transmission 10 has its output shaft 19a
When the vehicle is mounted so as to be directed rearward, the size of the rear transmission power unit 11 projecting upward from the rear fork 6 can be made relatively short.

Next, the electric transmission according to the second invention will be described in detail with reference to FIGS. FIG. 5 is a side view of a bicycle equipped with the electric transmission according to the second invention, and FIG.
Is a plan view showing a main part of the electric transmission according to the second invention,
FIG. 7 is a side sectional view showing a power unit of the rear transmission, and FIG.
8 is a front view showing a front transmission with a part cut away, and FIG.
FIG. 9 is a sectional view taken along line IX-IX of the power unit in FIG. In addition,
The fractured part in FIG. 8 shows a cross section taken along the line VIII-VIII in FIG. In these figures, the same or equivalent members as those described in FIGS. 1 to 4 are designated by the same reference numerals, and detailed description thereof will be omitted.

In these drawings, reference numeral 51 is an electric transmission according to the second invention. This electric transmission 51
Is a structure in which the exterior rear transmission indicated by reference numeral 52 in FIGS. 5, 6 and 7 is driven by a motor. 53 is a free gear that is axially mounted on the hub 5a of the rear wheel 5,
Reference numeral 54 is a chain guide that rehangs the chain 55 with the free gear 53. Since these are well-known in the art, description thereof will be omitted here.

Reference numeral 56 is a power unit for driving the chain guide 54. This power unit 56 is
Mounting bracket 57 on the right rear fork 6 of the frame 2
A case 58 fixed via the motor 58, a motor 59 and a reduction gear mechanism 60 mounted in the case 58, and links 61 and 6 for connecting the case 58 and the chain guide 54.
It is composed of 2 etc. The motor 59 is mounted with the output shaft 59a facing the rear of the vehicle body, and the worm 63 is fixed to the output shaft 59a. The operation of the motor 59 is controlled by a controller described later.

The reduction gear mechanism 60 includes a worm wheel 64 that meshes with the worm 63, and a first spur gear 6 that is provided coaxially with the worm wheel 64 and rotates the same.
5 and a second spur gear 66 that meshes with the first spur gear 65.
A third spur gear 67 which is provided coaxially with the second spur gear 66 and rotates the same, a fourth spur gear 68 which meshes with the third spur gear 67, and a fourth spur gear 68 which is coaxial with the fourth spur gear 68. And a fifth spur gear 69 that is provided on the
It is provided with a fan-shaped gear 70 and the like that mesh with.

The fan-shaped gear 70 is rotatably supported by the case 58 via a rotary shaft 71, and the rotary shaft 71 is provided.
Constitutes one of the support shafts of the link 61. One end of each of the links 61 and 62 is pivotally supported by the power unit 56 via the rotary shaft 71 and the support shaft 72, and the other end is supported by the support shafts 73 and 7.
It is pivotally supported by the chain guide 54 via the connector 4. The rotary shaft 71 and the support shafts 72 to 74 are parallel to each other. That is, the power unit 56 and the chain guide 5
4 is connected via a parallel link composed of links 61 and 62. The attachment angles of the links 61 and 62 are such that when the links 61 and 62 are each swung about the power unit 56 side, the chain guide 5 connected to the swing end portion.
4 is set so as to move along the direction in which the chain 55 is rewound.

In the power unit 56 thus constructed, the rotation of the motor 59 is controlled by the worm 63 to the worm wheel 64, the first spur gear 65, the second spur gear 66, the third spur gear 67, the fourth spur gear 68, It is transmitted to the rotating shaft 71 via the fifth spur gear 69 and the fan gear 70. Then, the rotation of the rotating shaft 71 causes the link 61 to swing, and accordingly, the link 62 also swings so that the chain guide 54 shifts.

In FIG. 7, reference numeral 75 is a sensor for detecting the rotational position (shift position) of the rotary shaft 71. As the sensor 75, the same sensor as that used in the embodiment shown in FIGS. 1 to 4 is used. The input shaft of the sensor 75 is connected to the shaft end of the rotary shaft 71.

Reference numeral 76 denotes the motor 5 of the power unit 56.
9 is a controller for controlling the operation of FIG. As shown in FIG. 9, the controller 76 includes a case body 78 that holds the seat tube 2a together with a front transmission 77, which will be described later, and a cover 79 that is openably and closably attached to the case body 78. A battery 80 as a power source for the transmission is housed in the circuit, and a control circuit (not shown) is mounted in a circuit mounting portion 70 formed in a cover 79. The upper portion of the controller 76 is structured to hold the seat tube 2a under pressure. Further, four batteries 80 are accommodated as shown in FIG.

The control circuit is connected to a sensor 75 provided on the rear transmission 52 and a shift switch 27 attached to the steering handle 8. This control circuit is also configured to control the motor 59 of the power unit 56 according to the commanded shift speed input by the shift switch 27, as in the embodiment shown in FIGS.

Further, the controller 76 is constructed so as to control the shift in the front transmission 77 provided on the crankshaft 32 side, in addition to controlling the shift in the electric transmission 51 described above. .

The front transmission 77 has a structure in which a chain guide 84 for rewinding the chain 84 around two chain rings 82 and 83 provided coaxially with the crankshaft 32 is driven by a motor. In other words, the conventional exterior front transmission has a motor-driven structure.

Reference numeral 85 denotes a power unit for driving the chain guide 84. The power unit 85 is constructed by mounting a motor 87 and a power transmission mechanism 88 in a front / rear two-divided case 86. And the case 8
The controller 76 is fixed to the front side of the frame 6 by screws, and the case 86 and the controller 76 hold the seat tube 2a of the frame 2 to fix the same to the frame 2. Further, the case 86 of the power unit 85 is curved so that the rear part thereof avoids the rear wheel 5.

The motor 87 in the power unit 85 is arranged with the output shaft 87a parallel to the vehicle width direction.
The worm 89 is fixed to 7a. The power transmission mechanism 88 includes a worm wheel 90 that meshes with the worm 89, a first spur gear 91 that is provided coaxially with the worm wheel 90 and rotates in the same direction, and the first spur gear 9
The second spur gear 92 meshing with the first spur gear 92, the third spur gear 93 provided coaxially with the second spur gear 92 and rotating the same, and the chain guide 84 meshing with the third spur gear 93 and having one end thereof Rack gear 94 and the like to which is fixed.

The rack gear 94 is provided with teeth on its lower surface and is supported by guides 86a, 86b and 86c formed on the case 86 so as to be movable in the longitudinal direction, and the end portion having the chain guide 84. Case 86
It penetrates the side part of and is led out to the outside of the case. Further, the rack gear 94 is attached to the case 86 in a state of being inclined downward as viewed from the front side of the vehicle body, in other words, along the direction in which the chain 55 is rewound.

In the power unit 85 thus constructed, the output shaft 87a of the motor 87 is rotated by the worm 89.
Is transmitted to the rack gear 94 through the worm wheel 90, the first spur gear 91, the second spur gear 92, and the third spur gear 93. That is, since the rack gear 94 reciprocates by rotating the motor 87,
The chain 55 is rewound between the two chain rings 82 and 83 by the chain guide 84. The position of the rack gear 94 when the chain 55 is wound around the inner chain ring 83 is shown by a chain double-dashed line L in FIG.

Reference numeral 95 denotes a sensor for detecting the position (shift position) of the rack gear 94. The sensor 95 is the same as that used in the rear transmission 52.
The spur gear 9 fixed to the input shaft of the sensor 95
6 meshes with the rack gear 94.

Electric transmission 5 constructed as described above
In No. 1, when the shift switch 27 is operated, the power unit 56 and the power unit 85 of the front transmission 77 are respectively controlled by the controller 76 to perform the gear shift operation.

Therefore, in the electric transmission 51 according to the second aspect of the invention, the driving motor 59 and the speed change chain guide 54 are gear type power transmission members (reduction gear mechanism 60).
Since the members are connected via only the power transmission path, there is no member having a variable length in the power transmission path.

[0049]

As described above, in the electric transmission for a bicycle according to the first aspect of the invention, the internal transmission is arranged in the hub of the rear wheel, and the shift switch is provided in the operating mechanism of the internal transmission. A gear shifting motor that is driven according to an operation is connected, and the motor is supported by a case attached to a rear fork of the frame and is connected to the operation mechanism via a gear. In such an electric transmission of a bicycle, a chain guide for rewinding a chain around a plurality of chain rings provided on a hub of a rear wheel is mounted on a frame via a power unit, and the power unit is operated according to a shift switch operation. A case in which a gear shifting motor driven by the motor is mounted and is fixed to the frame, and one end of the case is pivotally supported and the chain guide is connected to the other end, And a parallel link for moving the chain guide along the rewinding direction, and the case side end of the parallel link is connected to the motor through a gear, so that the gear shifting motor and the gear shifting member of the transmission are connected. Are connected only via the gear type power transmission member.

Therefore, when the transmission is driven by the motor, there is no member of which the length is changed in the power transmission path. Therefore, even if the transmission is used for a long period of time, the accuracy of the shift position may deteriorate due to mechanical error. There is nothing.

[Brief description of drawings]

FIG. 1 is a side view of a bicycle equipped with an electric transmission according to a first aspect of the invention.

2A and 2B are views showing a main part of the electric transmission according to the first invention, wherein FIG. 2A is a side sectional view, FIG. 2B is a sectional view taken along line BB in FIG. 2A, Figure (c) is C in Figure (a)
It is a -C line sectional view.

FIG. 3 is a plan view showing a front transmission with a part cut away.

FIG. 4 is a side view showing a front transmission with a part cut away.

FIG. 5 is a side view of a bicycle equipped with the electric transmission according to the second invention.

FIG. 6 is a plan view showing a main part of an electric transmission according to a second invention.

FIG. 7 is a side sectional view showing a power unit of the rear transmission.

FIG. 8 is a front view showing a front transmission with a part cut away.

9 is a cross-sectional view taken along the line IX-IX of the power unit in FIG.

[Explanation of symbols]

 6 Rear Fork 9 Electric Transmission 10 Rear Transmission 11 Power Unit 12 Controller 14 Switching Arm 18 Case 19 Motor 20 Reduction Gear Mechanism 51 Electric Transmission 52 Rear Transmission 53 Free Gear 54 Chain Guide 55 Chain 56 Power Unit 58 Case 59 Motor 60 Reduction gear mechanism 61 link 62 link 71 rotating shaft 76 controller

Claims (2)

[Claims] 1. An internal transmission is provided in the rear wheel hub,
The operating mechanism of this internal transmission is connected to a gear shifting motor that is driven in response to shift switch operation.The motor is supported by a case mounted on the rear fork of the frame, and is also supported by a gear. An electric transmission for a bicycle, characterized in that it is connected to the operating mechanism. 2. A chain guide for rewinding a chain around a plurality of chain rings provided on a hub of a rear wheel is mounted on a frame via a power unit, and the power unit is driven according to a shift switch operation. A case in which a gear shifting motor is attached and fixed to the frame,
One end of the case is pivotally supported and the other end thereof is connected to the chain guide, and the chain guide is configured to move along the direction in which the chain is rewound.
An electric transmission device for a bicycle, wherein an end portion of the parallel link on the case side is connected to the motor via a gear.