JPH0735152Y2 - Gearbox - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission incorporated in a power transmission mechanism of a vehicle or the like.

[0002]

2. Description of the Related Art For example, in a transmission used in a bicycle, various kinds of sprockets having different diameters are provided on the axles of the rear wheels, and the sprockets on the rear wheels around which the chain is chained are appropriately selected. By doing so, it is possible to perform a multi-speed shift operation. This kind of transmission has a displacement means for axially moving a chain that is hung on a sprocket on the rear wheel side, and a tension gear that is spring-biased. It is designed to absorb the slack in the chain due to the difference.

Although vehicles equipped with an internal combustion engine are provided with automatic transmissions, these automatic transmissions are generally composed of hydraulic mechanisms.

[0004]

However, in the conventionally used transmission, for example, a multi-stage transmission of a bicycle, the following drawbacks are found. Although a large number of sprockets are provided, only a few sprockets are actually used for operation, and many sprockets serve as a buffer for gear shifting, making it inconvenient for installation and use, and for maintenance and repair. It is also inconvenient.

2. When the chain moves to another sprocket and shifts, the chain has to be separated from the sprocket, which affects the operation of pedaling and the operation of the bicycle, and also has the drawback that the chain frequently falls off.

3. The maximum speed and the minimum speed are determined by the minimum diameter and maximum diameter of the sprocket, but the diameter ratio between the maximum sprocket and the minimum sprocket is constant, and there is a practical limit. It is restricted.

4. The conventional bicycle gearbox is a manual gearshift control, and does not have an automatic gearshift function. Therefore, attention is distributed to the gearshift operation, which is inconvenient for bicycle riding.

Although automobiles and the like equipped with an internal combustion engine are provided with automatic transmissions, since these automatic transmissions are constituted by hydraulic mechanisms, the structure is complicated and the occupied volume for installation is also large. It is large and costly. Further, since maintenance and repair are also difficult, the automatic transmission using a hydraulic mechanism is not suitable for a bicycle or the like that requires a simple transmission.

The present invention has been made in order to solve the problems associated with the above-mentioned prior art, and is a transmission device incorporated in a power transmission mechanism for transmitting the driving force of an input shaft to an output shaft, and the automatic transmission An object of the present invention is to provide a transmission that has a function, the range of the gear ratio is not limited, has a simple structure, occupies a small volume, is excellent in cost, and can achieve convenience in maintenance and repair. And

[0010]

[Means for Solving the Problems] The present invention for achieving the above object is as follows. The input shaft side wheel (15) rotatably attached to the input shaft (10) and the output shaft side wheel (21) provided on the output shaft (411) are connected via the power transmission member (2). It is incorporated in a power transmission mechanism to be connected and is provided between the input shaft (10) and the input shaft side foil (15) to be connected to the input shaft side wheel (1
5) is provided between the output shaft side wheel (21) and the output shaft (411), and is provided between the first speed changing means (1) for changing the rotation speed of the output shaft (411). A transmission having at least one second transmission means (3) for performing transmission, comprising:
The first speed change means (1) is configured to rotate the input shaft (1
Sun external gear (13) which is driven by (0) and rotates forward (R1), the sun internal gear (141) fixed so as to cover the outer periphery of this sun external gear (13), and these sun gears (13, 141) and the planetary gear (1
The first gear train that drives the input shaft side wheel (15) via (4) to generate a first rotation speed on the output shaft (411).
(12) and forward rotation (R1) driven by the input shaft (10) to rotate forward (R1) and to be meshed with and disengageable from the side surface orthogonal to the axis of the input shaft side wheel (15). The input shaft
The input shaft side wheel (15) is slidably mounted on (10) and meshes with the input shaft side wheel (15) to be driven by the input shaft (10) to rotate forward (R1). Then, the output shaft
The ratchet means (16) for generating a second rotation speed higher than the first rotation speed in (411), the meshing of the ratchet means (16) with the side surface orthogonal to the axis of the input shaft side wheel (15), and A clutch disc (33) rotatably provided on the output shaft (411), and a clutch means (17) for switching the release.
3) is provided between the output shaft side wheel (21) and the output shaft (411) rotates at a predetermined speed higher than the second rotation speed, the output shaft (411) The output shaft side wheel (21) and the clutch disc (33) are generated by centrifugal force caused by rotation.
Centrifugal force clutch means (32) for engaging the output shaft side wheel (21) and the clutch disc (33) by the centrifugal force clutch means (32), the output shaft (411)
The sun external gear (35) provided on the
A sun internal gear (36) fixed so as to cover the outer periphery of 5),
The output shaft is meshed with these sun gears (35, 36) and through a planetary gear (34) pivotally supported by the clutch disc (33).
And a second gear train for driving the output shaft (411) to cause the output shaft (411) to generate a third rotation speed higher than the second rotation speed.

2. The first gear train (12) of the first speed change means (1) has a first ratchet (12) fixed to the input shaft (10) when the input shaft (10) rotates forward (R1). Sun external gear (13) provided with engaging claws (132) that engage with (131)
An internal gear ring (141) fixed to the boss (10a) holding the input shaft (10) so as to cover the outer periphery of the sun external gear (13), and these sun gears (13, 141). Having a plurality of planetary gears (14) that mesh with each other, the input shaft side wheel (15),
It consists of a sprocket that meshes with the chain (2) as a power transmission member, and it also has an input shaft (1
0) is rotatably attached, the planetary gear (14) is rotatably supported on one side surface facing the sun gear (13, 141) on both side surfaces orthogonal to the axis of the input shaft side wheel (15), A meshing member (153) meshing with the ratchet means (16) is formed on the other side surface orthogonal to the axis, and the ratchet means (16) is provided with a second ratchet (1) slidably provided on the input shaft (10).
61) and a wheel board (160) provided with engaging claws (162) that engage with the second ratchet (161) when the input shaft (10) rotates forward (R1). A meshing member that meshes with the meshing member (153) of the input shaft side wheel (15) on a side surface of the wheel board (160) that is opposite to the input shaft side wheel (15) on both sides orthogonal to the axis.
(163) is formed, the clutch means (17) is slidably provided along the axial direction of the input shaft (10), and engages with the outer peripheral edge portion (164) of the wheel board (160). Engagement recess (171)
have.

3. Further, the meshing member (153) of the input shaft side wheel (15) and the meshing member (163) of the ratchet means (16) mesh with each other in the rotation direction of the forward rotation (R1). It is composed of flat ratchet teeth.

4. A ball (166) spring-biased outward in the radial direction of the input shaft (10) is housed in a ball hole (168) formed in the input shaft (10), and the ratchet means ( Two ring-shaped concave grooves (165, 165) that engage with the balls (166) are formed at the base end of the input shaft (10) along the axial direction.

5. The first ratchet (131) is
When the input shaft (10) rotates forward (R1), it engages with the engaging claw (132) of the sun external gear (13) to rotate the sun external gear (13) in the forward rotation direction (R1). On the other hand, when the sun external gear (13) rotates in the positive rotation direction (R1) at a speed higher than the rotation speed of the input shaft (10), the sun external gear (13) should not engage with the engagement claw (132). Is a transmission.

6. Further, the output shaft side wheel (21) is engaged with the inner ratchet (25) fixed to the output shaft (411) and the inner ratchet (25) when rotating forward (R1). A support ring (31) provided with an engaging claw (24) for rotationally driving the output shaft (411) in the forward rotation direction (R1) and projecting in a ring shape.
Is an outer ratchet (23) formed on the side surface orthogonal to the axis, and engages with the outer ratchet (23) when rotating forward (R1) to rotate the outer ratchet (23) in the forward rotation direction (R1). A chain as a power transmission member is provided with an engaging claw (22) that is driven to rotate.
(2) and a sprocket meshing with the clutch disc (33) is provided on the outer peripheral edge of the clutch disc (33) so as to face the support ring (31) and between the support ring (31). The centrifugal clutch means (32) is connected to the output shaft (4
11) The clutch convex piece (3
31) having the clutch disc (33) and the support ring (31)
And the outer ratchet connected to the support ring (31) only when the clutch disc (33) rotates forward (R1).
A coupling (30) for rotationally driving (23) is provided, and the second
The second gear train of the speed change means (3) engages with the ratchet fixed to the output shaft (411) during the forward rotation (R1) to move the output shaft (411) in the forward rotation direction (R1). The sun external gear (35) provided with an engaging claw (351) that is driven to rotate, and the inner peripheral surface of the fixed shaft case (361) cover the outer periphery of the sun external gear (35). It has an internal gear (36) provided and a plurality of planetary gears (34) which mesh with these sun gears (35, 36) and are axially supported by the clutch disc (33).

7. Further, the centrifugal force clutch means (32)
Is a metal plate on the inner surface of the friction shoe lining (324) made of an elastic material that comes into contact with the inner peripheral surface of the clutch protruding piece (331).
(323) are integrally attached to each other, and a plurality of expansion clutch shoes (320) having an arc shape and an elastic means (32) for connecting the adjacent expansion clutch shoes (320) to each other are provided.
2) and

8. Further, the expansion clutch shoes (32
(0) has recesses (321) formed at both ends thereof, and a plurality of outer mortises (323a) formed on the inner peripheral surface of the metal plate (323) of the expansion clutch shoe (320) and the support ring. (31)
A support tenon (312) is arranged between the inner mortise (313) formed on the outer peripheral surface of the plurality of inner mortises (313) and is inserted between the recesses (321) of the adjacent expansion clutch shoes (320). A protrusion support block (311) is formed on the outer peripheral surface of the support ring (31), and when the support ring (31) rotates forward (R1), presses the end portion of the expansion clutch shoe (320). An inclined surface for expanding the lever clutch clutch shoe (320) outward in the radial direction is formed on the projection support block (311).

9. Further, the coupling (30) is formed on the outer peripheral surface of the inner ring (306) of the clutch disc (33) provided so as to face the inner peripheral surface (301) of the support ring (31). A plurality of wedge-shaped portions (303) are formed so that the clearance between the surface (301) and the inner circumferential surface (301) is reduced. ) Is arranged.

10. Further, the second second speed change means (3 ′) connected to the second speed change means (3) is provided with the output shaft (41
The second clutch plate (33 ') rotatably installed in 1),
It is provided between the second clutch disc (33 ') and the sun external gear (35), and when the output shaft (411) rotates at a predetermined speed higher than the third rotation speed, Output shaft (4
Second centrifugal force clutch means (32 ') for engaging the sun external gear (35) with the second clutch disc (33') by the centrifugal force caused by the rotation of (11), and the second centrifugal force clutch. Means (32 ')
The sun external gear (35) and the second clutch disc (3
3 ') is engaged with the second sun external gear (35') provided on the output shaft (411), and the second sun external gear (35 ').
The second sun internal gear fixed so as to cover the outer periphery of (35 ')
(36 ') and the second sun gear (35', 36 ') and the second planetary gear (34') which is supported by the second clutch disc (33 ') and meshes with the output shaft. And a gear train that drives the output shaft (411) to generate a fourth rotation speed higher than the third rotation speed.

11. The input shaft (10) is connected to a bicycle pedal (11), and the output shaft (411) is a rear wheel of the bicycle.
It is the axle of (4).

[0021]

When the input shaft rotates forward, the sun external gear of the first speed changing means is also driven by the input shaft to rotate forward, and the planetary gear that meshes with the sun external gear and the sun internal gear is the sun external gear. It rotates around the gear in the forward rotation direction. The rotation of the planetary gear causes the wheel on the input shaft side to shift at a speed lower than the rotational speed of the input shaft and rotate in the forward rotation direction, and to the output shaft side connected to the wheel on the input shaft side via a power transmission member. The wheel also rotates in the forward rotation direction. As a result, the output shaft rotates in the forward rotation direction at the first rotation speed. Further, when the ratchet means, which is driven by the positively rotating input shaft and rotates normally, is engaged with the side surface orthogonal to the axis of the input shaft side wheel by the clutch means, the input shaft side wheel has the same rotation speed as the input shaft. The gear is shifted to and rotates in the forward rotation direction. This allows
The output shaft rotates in the forward rotation direction at a second rotation speed that is higher than the first rotation speed. Further, when the output shaft rotates at a predetermined speed higher than the second rotation speed, the centrifugal force clutch means of the second speed changing means operates to engage the output shaft side wheel and the clutch disc. . As the clutch disk rotates, the planetary gear of the second speed changing means rotates in the forward rotation direction around the sun external gear provided on the output shaft, and the sun external gear rotationally drives the output shaft. As a result, the output shaft is shifted to the third rotation speed higher than the second rotation speed, and rotates in the forward rotation direction.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a cross-sectional view of an essential part showing a first transmission that shifts the rotational speed of a drive shaft wheel, and FIG.
It is a principal part sectional view which shows the 2nd transmission device which shifts the rotational speed of a driven shaft.

The transmission according to the present invention includes a first transmission means connected to the drive shaft and other drive devices and for performing primary shift of the rotational speed of the drive shaft side wheel, and a driven shaft and other driven devices. The second transmission means is provided continuously and performs a secondary transmission of the rotational speed of the driven shaft. In particular, the illustrated transmission is
FIG. 1 shows a case where the invention is applied to a bicycle, and the bicycle is, as shown in FIG. 1, a drive side sprocket (corresponding to an input shaft side wheel) attached to a drive shaft (corresponding to an input shaft) 10 driven by a pedal 11. 6) and a driven side sprocket (corresponding to the output shaft side wheel) 21 attached to a core shaft (corresponding to the output shaft) 411 through which the axle 42 of the rear wheel 4 is inserted, as shown in FIG. The chain 2 as a power transmission member is hung between the sprockets 15 and 21.

As shown in FIG. 1, the driving side sprocket 1
The first transmission 1 for changing the rotation speed of the first gear train 5 has a first gear train 12 for causing the drive-side sprocket 15 to generate the first rotation speed, and a ratchet means 1 for generating the second rotation speed.
6 and clutch means 17 for switching the first and second rotational speeds of the drive side sprocket 15.

As shown in FIGS. 1 and 2, the first gear train 12 has a first ratchet 131 fixed to the drive shaft 10.
The sun external gear 13 provided with a plurality of engaging claws 132 for engaging with, the internal gear ring 141 provided so as to cover the outer periphery of the sun external gear 13, and the sun external gear 13 It has a planetary gear 14 that meshes with the tooth gear ring 141. The engagement claw 132 is supported by the sun external gear 13 in a concentric circle with the drive shaft 10 by being spring-biased and supported by the sun external gear 13 so that the drive shaft 10 moves in the forward rotation direction indicated by an arrow R1 in FIG. When rotated, the engagement claw 132 moves the first ratchet 131.
By engaging with, it rotates in the same forward rotation direction R1. The internal gear ring 141 is provided on the outer peripheral edge of the disk 140 fixed to the boss portion 10 a holding the drive shaft 10 so as to cover the outer periphery of the sun external gear 13. In addition, the planetary gear 14 is the both sun gears 13,
It engages with 141, and performs a rotary motion centering on the drive shaft 10. The planetary gear 14 is provided on the drive side sprocket 15.

As shown in FIGS. 1 and 3, the drive side sprocket 15 is rotatably attached to the drive shaft 10 via a bearing 151 such as a bearing, and has sprocket teeth 152 meshing with the chain formed on the outer periphery thereof. Has been done. A shaft 142 is provided on the left side surface in FIG. 1 facing the sun gears 13 and 141 on both axially orthogonal side surfaces of the drive side sprocket 15, and the planetary gear 14 is pivotally supported by the shaft 142. In addition, the drive side sprocket 15 is shown in FIG.
A sprocket-side meshing member 153 that meshes with the ratchet means 16 is formed on the right side of the center. As shown in FIG. 3, the sprocket-side meshing member 153 is composed of flat plate ratchet teeth carved in an arc shape or a cycloid shape, and rotates forward between a wall portion along the radial direction and an adjacent wall portion. An inclined surface that is inclined upward in the direction R1 is formed.

The ratchet means 16 is, as shown in FIGS. 1 and 4, a second ratchet 161 slidably provided on the drive shaft 10 and a plurality of engaging claws for engaging the second ratchet 161. And a wheel board 160 provided with 162. The wheel board 160 has a diameter substantially the same as that of the drive side sprocket 15, and the second ratchet 161 is
It is concentrically arranged in the central part. Engaging claw 16
2 is supported by a wheel disc 160 concentrically with the drive shaft 10 by being spring-biased by the wheel disc 160. When the drive shaft 10 rotates in the forward rotation direction R1, the engagement claw 162 of the wheel disc 160 is rotated by the second ratchet 161. By engaging with, it rotates in the same forward rotation direction R1. On the other hand, the second ratchet 16
When 1 rotates in the reverse direction, the engagement between the second ratchet 161 and the engaging claw 162 is released. Further, a wheel-side meshing member 163 which meshes with the sprocket-side meshing member 153 is formed on the left side surface in FIG. As shown in FIG. 4, the wheel board side meshing member 163 is composed of flat plate ratchet teeth carved in an arc shape or a cycloid shape, and is formed between a wall portion along the radial direction and an adjacent wall portion. An inclined surface which is inclined downward in the rotation direction R1 is formed.
As a result, the ratchet means 16 and the drive side sprocket 15 are both meshing members 1 when they rotate in the forward rotation direction R1.
53 and 163 will be engaged. Ratchet means 1
Numeral 6 is slid along the drive shaft 10 by the clutch means 17, and both meshing members 1 with respect to the drive side sprocket 15 are provided.
The meshing of 53 and 163 and the release thereof can be switched.

As shown in FIG. 1, the clutch means 17 is slidably provided along the axial direction of the drive shaft 10 and has a projecting edge 164 formed on the outer peripheral edge portion of the wheel board 160.
An engaging recess 171 that engages with is provided. As shown in FIG. 5, in a ball hole 168 formed in the drive shaft 10, a ball 166 spring-biased outward by the spring 167 in the radial direction of the drive shaft 10 is stored.
At the base end of the ratchet means 16, two ring-shaped recessed grooves 165 that engage with the balls 166 are formed along the axial direction. As shown in FIG. 5, the ratchet means 16 is fixed in a state in which the ratchet means 16 is disengaged from the drive side sprocket 15 by engaging the ball 166 with the concave groove 165 on the left side in the figure. Further, the ball 166 engages with the concave groove 165 on the right side in the figure, whereby the ratchet means 16 is fixed in a state of being meshed with the drive side sprocket 15. The clutch means 17 is
For example, a lever (not shown) attached to a bicycle handle or the like is connected through a wire or the like, and the clutch means 17 is operated by an occupant manually operating the lever.

As shown in FIG. 2, the first ratchet 131 is formed with a ratchet tooth along the radial direction and an inclined surface which is inclined upward in the forward rotation direction R1 between adjacent ratchet teeth. , The first ratchet 131 engages with the engaging claw 132 of the sun external gear 13 when the drive shaft 10 rotates forward R1, and moves the sun external gear 13 in the forward rotation direction R1.
It will be driven to rotate. On the other hand, when the drive shaft 10 rotates in the reverse direction, or in the forward rotation direction R of the sun external gear 13
The rotation speed of 1 is the forward rotation direction R1 of the first ratchet 131.
If it is faster than the rotation speed of the first ratchet 131
Since the engagement between the engagement claw 132 and the engagement claw 132 is released, the engagement claw 132 of the sun external gear 13 does not rotate the drive shaft 10. The first ratchet 131 and the engaging claw 13
Due to the relationship with 2, when the drive shaft 10 performs a driving action only in the forward rotation direction and the wheel board 160 of the ratchet means 16 meshes with the drive side sprocket 15 and rotates at high speed,
The rotation of the drive shaft 10 and the wheel board 160 is controlled by the sun external gear 13
Does not interfere with the rotational relationship between the drive shaft 10 and the drive shaft 10.

When the drive shaft 10 makes a positive rotation R1,
Through the first gear train 12 including the sun gears 13, 141 and the planetary gears 14, the drive side sprocket 15 is rotated at a speed lower than the rotation speed of the drive shaft 10 to make a positive rotation R1.
The driven sprocket 21 connected to the drive sprocket 15 via the chain 2 also rotates in the forward rotation direction. As a result, the core shaft 411 rotates in the forward rotation direction at the first rotation speed. Further, when the ratchet means 16 is engaged with the side surface of the drive side sprocket 15 orthogonal to the axis by the clutch means, the drive side sprocket 15 has the drive shaft 1
The speed is changed to the same speed as 0 and the positive rotation R1 is performed.
As a result, the core shaft 411 rotates in the forward rotation direction at the second rotation speed higher than the first rotation speed. At this time, the rotation speed of the sun external gear 13 becomes faster than the rotation speed of the drive shaft 10 via the first gear train 12, so that the first ratchet 131 runs idle.

As shown in FIGS. 6 and 7, the chain 2 meshed with the drive side sprocket 15 is stretched over the driven side sprocket 21 provided on the axle 42 of the rear wheel 4. As shown in FIG. 7, the driven sprocket 21 has an inner ratchet 25 fixed to a hollow core shaft 411 through which the axle 42 is inserted, and an engaging engagement with the inner ratchet 25 in the forward rotation direction. It has an outer ratchet 23 provided with a claw 24 and an outer ring provided with an engaging claw 22 that engages with the outer ratchet 23 in the forward rotation direction.
The core shaft 411 is the shaft boss portion 4 of the axle 42 of the rear wheel 4.
It is provided in series with 1. The outer ring and both ratchets 23 and 25 are provided concentrically, and the outer ring of the outer ring has sprocket teeth 2 that mesh with the chain 2.
11 is formed. Each of the engaging claws 22 and 24 is concentrically concentric with the axle shaft 42 and is axially supported by an outer ring and an outer ratchet 23 while being spring-biased. Each of the outer ratchet 23 and the inner ratchet 25 is formed with a ratchet tooth along the radial direction and an inclined surface that is inclined downward along the clockwise normal rotation direction in the figure between the adjacent ratchet teeth. There is. Therefore, when the driven sprocket 21 rotates in the clockwise positive rotation direction in the drawing, the outer ratchet 2
3 is rotated in the same forward rotation direction by the engagement of the engagement claw 22 of the outer ring. Further, as the outer ratchet 23 rotates in the forward rotation direction, the inner ratchet 25 engages with the engaging claw 24 of the outer ratchet 23 and rotates in the same forward rotation direction, and the axle 42 is accordingly rotated. It will rotate in the forward rotation direction. On the other hand, each ratchet 23,
Due to the relationship between 25 and the engaging claws 22 and 24, the driven sprocket 21 and the chain 2 meshed with the driven sprocket 21 can freely rotate in the counterclockwise direction in the figure. Also, the outer ratchet 2 of the driven sprocket 21
As shown in FIG. 6, 3 has a support ring 31 protruding in a ring shape on the side surface orthogonal to the axis thereof.

As shown in FIG. 6, the second speed change device 3 for changing the rotational speed of the core shaft 411 uses a clutch disc 33 rotatably mounted on the core shaft 411 and a centrifugal force generated by the rotation of the axle 42. Centrifugal force clutch means 32 that engages the driven side sprocket 21 and the clutch disc 33, and the second gear train 3 that causes the driven side sprocket 21 to generate a third rotation speed.
4, 35, and 36.

As shown in FIGS. 6 to 9, the clutch disc 33 is rotatably attached to the core shaft 411 via a bearing such as a bearing, and its outer peripheral edge portion has
A clutch protrusion 331 is formed so as to face the support ring 31 provided on the outer ratchet 23. The centrifugal force clutch means 32 is arranged between the clutch convex piece 331 and the support ring 31. The centrifugal force clutch means 32 is operated by the centrifugal force accompanying the rotation of the core shaft 411 when the core shaft 411 rotates at a predetermined speed higher than the second rotation speed, and the inner peripheral surface of the clutch convex piece 331. The driven side sprocket 21 and the clutch disc 33 are engaged with each other. In addition, the clutch disc 33 is provided at an inner part of the support ring 31 than the support ring 31.
An inner ring 306 is formed to face the inner peripheral surface 301 (see FIG. 10). The coupling 30 is arranged between the inner ring 306 and the support ring 31, and the coupling 30 operates only when the clutch disc 33 rotates in the forward rotation direction indicated by the arrow in FIG. Support ring 31
The outer ratchet 23 is connected to the outer ratchet 23 to rotate.

The second gear train is, as shown in FIG. 6, a sun external gear 35 provided with a plurality of engaging claws 351 for engaging a core shaft ratchet fixed to a core shaft 411, and a sun external gear 35. It has an internal gear 36 provided so as to cover the outer periphery of the external gear 35, and a planetary gear 34 that meshes with the sun external gear 35 and the internal gear 36. The internal gear 36 is provided on the inner peripheral surface of the shaft case 361 fixed to the vehicle body side so as to cover the outer periphery of the sun external gear 35. Further, the planetary gear 34 meshes with both sun gears 35 and 36, and
It is adapted to perform a rotary motion about 11. The planetary gear 34 is pivotally supported on a shaft 341 provided on the clutch disc 33. The engagement claw 351 is concentric with the core shaft 411 and is axially supported by the sun external gear 35 while being spring-biased. When the clutch disc 33 rotates in the forward direction and the planetary gear 34 pivotally supported by the clutch disc 33 drives the sun external gear 35 in the forward rotation direction, the engaging claws 351 engage the core shaft ratchet, The shaft 411 is driven to rotate in the forward rotation direction R1.

As shown in FIGS. 8 and 10, the centrifugal force clutch means 32 is expanded by centrifugal force and a plurality of expansion clutch shoes 3 are brought into contact with the inner peripheral surface of the clutch convex piece 331.
Each expansion clutch shoe 320 has a metal plate 323 integrally attached to the inner surface of a friction shoe lining 324 made of an elastic material. Each expansion clutch shoe 320 has an arc shape, and the adjacent expansion clutch shoes 320 are connected to each other by a tension spring 322 as elastic means. Further, recesses 321 are formed at both ends of each expansion clutch shoe 320, and a projection support block 311 inserted between the recesses 321 of the adjacent expansion clutch shoes 320 has a support ring 3 formed therein.
A plurality of them are formed on the outer peripheral surface of 1. A plurality of outer mortises 323a are formed on the inner peripheral surface of the metal plate 323 of the expansion clutch shoe 320, and a plurality of inner mortises 313 are formed on the outer peripheral surface of the support ring 31. A support mortise 312 for supporting the expanded expansion clutch shoe 320 on the support ring 31 is provided between the mortises 323a and 313.
Are arranged.

Further, as shown in FIG. 9, of the both end faces of the projection support block 311, the end faces on the forward rotation direction side indicated by the arrow are formed as inclined faces. When the support ring 31 rotates in the forward direction, the inclined surface of the protrusion support block 311 presses the end portion of the expansion clutch shoe 320 to expand the expansion clutch shoe 320 radially outward. There is. Further, when the speed of the bicycle is accelerated and a centrifugal force of a predetermined amount or more acts on the centrifugal force clutch means 32, the expanded expansion clutch shoe 320 supports the tenon 31.
Since it is supported on the support ring 31 by 2, the engagement between the centrifugal force clutch means 32 and the inner peripheral surface of the clutch convex piece 331 is further strengthened.

In the coupling 30, as shown in FIGS. 8 and 10, the gaps between the plurality of cam rings 302 facing the inner peripheral surface 301 of the support ring 31 and the inner peripheral surface 301 change. The cam ring 302 and the wedge-shaped portion 303 are respectively formed on the outer peripheral surface of the inner ring 306 provided in the central portion of the clutch disc 33. The wedge-shaped portion 303 is inclined along the direction opposite to the normal rotation direction indicated by the arrow in FIG. 9 so as to reduce the gap between the wedge-shaped portion 303 and the inner peripheral surface 301. And coupling 3
0 is configured by disposing a ball 304 held by a spring 305 in this gap.

This coupling 30 is a clutch disc 33.
When the inner ring 306 is driven by the normal rotation of the ball, the ball 304
This support ring 3 is engaged with the support ring 31 via
1 rotates in the forward direction, but even if the inner ring 306 is interlocked via the coupling 30 by driving the support ring 31 from the outside, the slope of the wedge-shaped portion 303 and the ball 304
Therefore, the outer support ring 31 cannot directly interlock the inner ring 306. This point is particularly important when the foot on the pedal 11 is rested while the bicycle is running, and the inner ring 306, the cam ring 302, the support ring 31, and the wheels continue to be engaged by the rotating inertial force. When the chain 2 and the driven side sprocket 21 are driven again by rotating and rotating the pedal 11, the driven side sprocket 21 is immediately driven. Therefore,
The so-called "idle" discomfort that is often seen when moving the position of the sprocket on which the chain is hung up in the conventional transmission does not occur.

When the core shaft 411 rotates forward at a predetermined speed higher than the second rotation speed, the centrifugal force clutch means 32 of the second speed changing means 3 is activated and the clutch disc 33 is operated.
Rotates forward. By rotating the clutch panel 33,
Through the second gear train including the sun gears 35 and 36 and the planetary gear 34, the core shaft 411 is shifted to the third rotation speed higher than the second rotation speed and rotated in the forward rotation direction. Driven. In this way, the rotation speed of the core shaft 411 becomes higher than the rotation speed of the outer ratchet 23 via the second gear train, so that the inner ratchet 25 is designed to idle.

The second second transmission means 3'which is another set connected to the second transmission means 3 is similar to the one described above, and as shown in FIG. A second support ring 31 ′ protruding in a ring shape is formed on a side surface orthogonal to the axis of a support plate 352 connected to the external gear 35, and a second clutch rotatably provided on the core shaft 411. The disk 33 ', the second centrifugal force clutch means 32' for engaging the sun external gear 35 and the second clutch disk 33 'by the centrifugal force caused by the rotation of the axle 42, and the gear trains 34', 35 ', 3
6'and.

The second clutch disc 33 'is rotatably attached to the core shaft 411, and has a second
The clutch protrusion 331 is disposed so as to face the support ring 31 '.
'Is formed. This clutch convex piece 331 'and the second
The second centrifugal force clutch means 32 is provided between the support ring 31 'and the support ring 31'.
′ Is arranged, and the second centrifugal force clutch means 32
When the core shaft 411 rotates at a predetermined speed higher than the third rotation speed, it is actuated by the centrifugal force associated with the rotation, and engages with the inner peripheral surface of the clutch convex piece 331 '. There is. In addition, the second clutch disc 33 'is formed with an inner ring facing the support ring 31' at a portion inward of the second support ring 31 '. A second coupling 30 'is arranged between the inner ring and the second support ring 31', and the second coupling 30 'operates only when the second clutch disc 33' rotates forward, It is adapted to drive the second support ring 31 '.

The gear train includes a second sun external gear 35 'fixed to the core shaft 411, and a second internal gear 36' provided so as to cover the outer periphery of the second sun external gear 35 '. , And has a second planetary gear 34 ′ that is meshed with these and rotates and that is axially supported by a second clutch disc 33 ′.

When the core shaft 411 rotates forward at a predetermined speed higher than the third rotation speed, the second centrifugal force clutch means 32 'operates and the second clutch disc 33' rotates forward. . The rotation of the second clutch disc 33 ′ causes the core shaft 411 to rotate at a speed higher than the third rotation speed via the gear train including the sun gears 35 ′ and 36 ′ and the planetary gear 34 ′. The rotational speed is changed to 4 and the rotational drive is performed in the forward rotation direction. In this way, the core shaft 411 is inserted through the gear train.
Since the rotation speed of the sun gear is faster than the rotation speed of the sun gear 35, the sun external gear 35 rotates idly.

Since the second sun external gear 35 'is fixed to the core shaft 411, when the occupant does not step on the pedal 11 while the bicycle is traveling, the bicycle uses the inertial force of the second sun external gear 35'.
The sun external gear 35 'is interlocked, and two sets of transmissions 3 and 3'are connected.
Engage with each other and rotate. In this case, when the chain 2 and the sprocket 21 are made to work by depressing the pedal 11, they are immediately driven, so that "idle pedaling" does not occur.

The diameter of the driven sprocket 21 is almost the same as the diameter of the clutch discs 33, 33 ', and when the planetary gear device provided on the rear wheel 4 side is rotated, the traveling speed of the bicycle is automatically increased. Will be.

Next, the operation of this embodiment will be described.

First, a state in which the ratchet means 16 is separated from the drive side sprocket 15 as shown in FIG. 1 will be described. In this case, when the drive shaft 10 is rotated by stepping on the pedal 11, as shown in FIG. 2, the first ratchet 13
1 engages with the engaging claw 132 of the sun external gear 13, and the sun external gear 13 rotates in the forward rotation direction R1. As the sun external gear 13 rotates, the planetary gear 14 moves to the internal gear ring 14
1, and the drive side sprocket 15 that pivotally supports the planetary gear 14 also rotates in the forward rotation direction R1. Then, the rotation of the drive side sprocket 15 is transmitted to the driven side sprocket 21 via the chain 2. As shown in FIG. 7, when the driven sprocket 21 rotates in the clockwise clockwise direction in the drawing, the engaging claw 22 of the outer ring engages with the outer ratchet 23, and further the outer ratchet 23 engages. The pawl 24 engages with the inner ratchet 25, and the axle 42 rotates in the forward rotation direction. As a result, the rear wheels 4 rotate and the bicycle travels at a low speed (first speed).

Then, the clutch means 17 is actuated to slide the ratchet means 16 along the drive shaft 10, and the wheel side meshing member 163 of the ratchet means 16 is meshed with the sprocket side meshing member 153 of the drive side sprocket 15. . The state in which the ratchet means 16 meshes with the drive side sprocket 15 is fixed by the ball 166 housed in the ball hole 168 of the drive shaft 10 engaging with the concave groove 165 on the right side in FIG. As a result, the drive shaft 1
The rotation of 0 is transmitted to the drive side sprocket 15 as it is and the chain 2 is driven, and the speed of the bicycle is accelerated. Thus ratchet means 16
When the drive side sprocket 15 is driven by, the rotation speed of the sun external gear 13 becomes faster than the rotation speed of the drive shaft 10 via the first gear train 12, so the first ratchet 131 runs idle.

For example, when climbing a slope, the clutch means 17 is actuated to move the ratchet means 16 to the right side shown in FIG. 1, and the engagement between the ratchet means 16 and the drive side sprocket 15 is released. When the drive shaft 10 is rotated by stepping on the pedal 11, the first ratchet 131 engages with the engaging claw 132 of the sun external gear 13, and the sun external gear 13 is rotationally driven by the drive shaft 10. The external gear 13 rotationally drives the planetary gear 14. Then, the bicycle travels with the drive side sprocket 15 being driven via the planetary gears 14. At this time, since the rotation speed of the drive sprocket 15 becomes much slower than the rotation speed of the sun external gear 13 and the drive shaft 10, the driving force of the drive sprocket 15, that is, the pedaling force, becomes very small.

Next, the operation of the second transmission 3, 3'will be described.

The driven sprocket 21 is not yet engaged with the clutch disc 33, and the planetary gear 34 and the sun external gear 3 are not engaged.
A case in which 5 does not interlock with the driven sprocket 21 will be described. In this case, as shown in FIG. 7, the driven side sprocket 21 is rotating in the clockwise clockwise direction in the drawing, the engaging claw 22 of the outer ring engages with the outer ratchet 23, and The engaging pawl 24 of the outer ratchet 23 engages with the inner ratchet 25, and the core shaft 411 rotates in the forward rotation direction. As a result, the shaft boss portion 4 connected to the core shaft 411 is connected.
The rear wheel 4 attached to 1 rotates and the bicycle runs. The speed at this time corresponds to the “first speed (low speed)” of the second transmission 3.

Next, the speed of the bicycle is accelerated further than the "first speed (low speed)", and the centrifugal force clutch means 3
When a centrifugal force of a predetermined magnitude or more is applied to 2, the centrifugal force clutch means 32 of the second transmission 3 is actuated, the expansion clutch shoe 320 is opened, and the inner peripheral surface of the clutch convex piece 331 is expanded, as shown in FIG. And a support ring 31 that is supported by the support mortise 312 and that is continuous with the outer ratchet 23 of the driven sprocket 21 engages with the clutch disc 33. As a result, the clutch disc 33 is rotationally driven by the driven sprocket 21, and the planetary gear 34 axially supported by the clutch disc 33 accelerates and rotates the sun external gear 35 that meshes with the planetary gear 34. The rotation of the sun external gear 35 is transmitted to the core shaft 411 by the engagement pawl 351 engaging with the core shaft ratchet, and the speed of the bicycle is accelerated. The speed at this time is the second transmission 3,
This corresponds to the "second speed" according to 3 '. As described above, when the core shaft 411 is driven via the planetary gear 34, the sun external gear 35, and the like, the rotation speed of the inner ratchet 25 becomes faster than the rotation speed of the outer ratchet 23, so that the outer ratchet 23 The engaging claws 24 do not engage with the inner ratchet 25, and the inner ratchet 25 will idle.

When the speed of the bicycle is further accelerated, the second second transmission device 3'is activated. Also in this case, it operates in the same manner as the above-mentioned first second transmission 3. That is, when a centrifugal force of a predetermined amount or more acts, the centrifugal force clutch means 32 ′ operates to support the support ring 31 ′ provided on the support disc 352 connected to the sun external gear 35 and the clutch disc 3.
3'is engaged. As a result, the clutch disc 33 ′ is rotationally driven by the sun external gear 35, and the clutch disc 33 ′ is rotated.
The planetary gear 34 'rotatably supported by ′ accelerates and rotates the sun external gear 35 ′ meshing with the planetary gear 34 ′. Since the sun external gear 35 'is fixed to the core shaft 411, the rotation of the sun external gear 35' is transmitted to the core shaft 411 as it is,
The speed of the bicycle will be further accelerated. The speed at this time corresponds to the “third speed” of the second transmission 3, 3 ′. In this way, when the core shaft 411 is driven via the planetary gear 34 'and the sun external gear 35', the core shaft 4
Since the rotation speed of 11 becomes faster than the rotation speed of the sun external gear 35, the engagement claw 351 of the sun external gear 35 does not engage with the core shaft ratchet, and the sun external gear 35 idles.

As described above, the driven sprocket 21
7 rotates clockwise in the clockwise direction in FIG. 7, the engaging claws 22 and 24 engage with the ratchets 23 and 25 to rotate the core shaft 411 in the forward rotation direction. ,
On the contrary, when the core shaft 411 rotates in the forward rotation direction, the ratchets 23 and 25 rotate idly without engaging with the engaging claws 22 and 24, so that the driven sprocket 21 cannot be rotationally driven. . Therefore, the second transmissions 3 and 3
When each of the ‘′ is operated and the rotational speed of the core shaft 411 is automatically changed and accelerated, each ratchet 23, 2
Therefore, the rotational movement of the core shaft 411 does not affect the rotational movement of the driven sprocket 21 and the chain 2.

The gear ratio of the first transmission 1 in this embodiment is given by the following equation. N = B / P -1 where B is the number of teeth of the fixed internal gear ring 14, and P is
Is the number of teeth of the sun external gear 13.

For example, the number of teeth of the internal gear ring 14 is B = 4
8. If the number of teeth of the sun external gear 13 is P = 36, N
= 1/3. This indicates that the rotation speed of the drive side sprocket 15 is reduced by 1/3, and the speed of the bicycle becomes slower.

When the ratchet means 16 and the drive side sprocket 15 are engaged, the rotation speed (N15) of the drive side sprocket 15 is the same as the rotation speed (N16) of the ratchet means 16, that is, N15 = N16. Because there is
The rotation speed output from the driving sprocket 15 is not reduced.

Similarly, by applying the speed change principle of the planetary gear device, the sun external gear 3 of the second speed change device 3, 3'is also applied.
5, 35 'are accelerated by the rotational movement of the planetary gears 34, 34' driven by the sprockets 15, 21.

Therefore, if the gear ratio of the first transmission 1 is 2
Then, if the gear ratio of the second transmission 3, 3'is 3,
The total of the gear ratios in this embodiment is 2 × 3 = 6.

In the embodiment described above, the second transmissions 3 and 3'are set to 2 in order to automatically shift the speed of the second transmission to the "first speed", the "second speed" and the "third speed". In the case of application to a bicycle, at least one second transmission 3 is used for the “first speed”,
It is sufficient to realize the "second speed" automatic transmission.

Also, the case where it is applied to a bicycle is shown,
The present invention is not limited to this case, and can be applied to other vehicles and power transmission devices by appropriately modifying them.

As described above, this embodiment has the following advantages.

1. Since the gear can be automatically changed according to the traveling speed of the vehicle, the gear can be shifted conveniently, and there is no risk of the chain coming off regardless of the replacement or movement of the chain, and the traveling efficiency of the bicycle can be improved.

2. By operating the sun external gear 13, the planetary gear 14, and the drive-side sprocket 15, when driving up a slope, the driving force is reduced at low speed. Further, when the ratchet means 16 is engaged with the drive side sprocket 15, the speed increases, and by combining the second transmissions 3 and 3 ', the speed further increases, and a wide range of control from low speed to high speed can be freely controlled. Become.

3. By appropriately changing the gear ratio between the planetary gears and the sun gear, the gear changeable range can be greatly changed. I will not receive it.

4. Since the gear shift is performed by using the centrifugal force, it is possible to reduce the momentary increase of the load due to the vibration and mechanical stress accompanying the gear shift. Moreover, since the expanded expansion clutch shoe 320 is supported on the support ring 31 by the support tenon 312, engagement between the centrifugal force clutch means 32 and the inner peripheral surface of the clutch convex piece 331 is further strengthened, and high speed operation is achieved. The engagement state at that time becomes extremely stable.

5. Gears can be shifted without using a hydraulic system such as those used in conventional gearboxes, so the structure is simple, the volume occupies is small, the cost is excellent, maintenance and repair are easy, and power is transmitted. The loss when doing is small.

6. Since automatic and manual shifts complement each other to increase the range of operation selection and convenience, it becomes a transmission suitable for the present time with a lot of leisure activities, increasing the range of shift selection, rich in taste and quality. Will also be higher.

[0069]

As described above, according to the present invention,
It is a transmission incorporated in a power transmission mechanism that transmits the driving force of an input shaft to an output shaft. It has an automatic gear shifting function, the range of gear ratio is not limited, and it has a simple structure with a small occupied volume and a low cost. In addition, it is possible to provide a transmission that is excellent in terms of convenience and can achieve convenience in maintenance and repair.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing a first transmission means in a transmission according to the present invention.

FIG. 2 is a side view taken along the line 2-2 of FIG.

FIG. 3 is a side view taken along the line 3-3 of FIG.

FIG. 4 is a side view taken along the line 4-4 of FIG.

FIG. 5 is an enlarged sectional view of an essential part showing a mounting structure of ratchet means on a drive shaft.

FIG. 6 is a cross-sectional view of essential parts showing a second speed change device in the speed change device according to the present invention.

7 is a cross-sectional view showing a driven side sprocket shown in FIG.

8 is a diagram showing the centrifugal clutch means shown in FIG. 6, and in particular, a sectional view showing a state before the centrifugal clutch means is activated.

9 is a view showing the centrifugal clutch means shown in FIG. 6, and in particular, a sectional view showing a state in which the centrifugal clutch means is operated.

10 is an exploded perspective view showing a part of a centrifugal clutch means and a support ring shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... 1st transmission device (1st transmission means) 2 ... Chain (power transmission member) 3 ... 2nd transmission device (2nd transmission means) 10 ... Drive shaft (input shaft) 12 ... 1st gear train 13 ... Outside the sun Toothed gear 14 ... Planetary gear 15 ... Drive side sprocket (input shaft side wheel) 16 ... Ratchet means 17 ... Clutch means 21 ... Driven side sprocket (output shaft side wheel) 32 ...
Centrifugal force clutch means 33 ... Clutch disc 34 ... Planetary gear 35 ... Sun external gear 36 ... Internal gear (Sun internal gear) 141 ... Internal gear ring (Sun internal gear) 411 ...
Core shaft (output shaft)

Claims (11)

[Scope of utility model registration request] 1. An input shaft side wheel (15) rotatably attached to an input shaft (10) and an output shaft side wheel (21) provided on an output shaft (411) comprise a power transmission member ( 2) is incorporated into a power transmission mechanism that is connected via, and is provided between the input shaft (10) and the input shaft side wheel (15) to change the rotation speed of the input shaft side wheel (15). First shifting means (1)
And at least one second speed change means (3) provided between the output shaft side wheel (21) and the output shaft (411) to change the rotational speed of the output shaft (411). A transmission, wherein the first transmission means (1) is driven by the input shaft (10) that rotates forward (R1) to rotate forward (R1).
The sun external gear (13), the sun internal gear (141) fixed so as to cover the outer periphery of the sun external gear (13), and the input shaft side wheel while meshing with these sun gears (13, 141)
The first gear train (which drives the input shaft side wheel (15) through the planetary gear (14) pivotally supported by (15) to generate a first rotation speed on the output shaft (411) ( 12) and forward rotation (R1) driven by the input shaft (10) that rotates forward (R1)
The input shaft side foil (15) is slidably provided on the input shaft (10) so as to be meshed with and disengageable from the side surface orthogonal to the shaft, and is meshed with the input shaft side wheel (15). When the input shaft (10) is driven to rotate forward (R1), the input shaft side wheel (15) is driven to cause the output shaft (411) to rotate at a second rotation speed faster than the first rotation speed. A ratchet means (16) for generating a speed, and a clutch means (17) for switching engagement and disengagement of the ratchet means (16) with respect to a side surface orthogonal to the axis of the input shaft side wheel (15), the second speed change The means (3) includes a clutch disk (3) rotatably provided on the output shaft (411).
3) and between the clutch disc (33) and the output shaft side wheel (21), when the output shaft (411) rotates at a predetermined speed higher than the second rotation speed. , The output shaft (411)
Centrifugal force clutch means (32) for engaging the output shaft side wheel (21) and the clutch disc (33) by the centrifugal force accompanying the rotation of
With this centrifugal force clutch means (32), the output shaft side wheel is
When the (21) and the clutch disc (33) are engaged, the sun external gear (35) provided on the output shaft (411) and the outer periphery of the sun external gear (35) are covered. The output shaft (411) through the sun internal gear (36) fixed as described above and the planetary gear (34) that meshes with these sun gears (35, 36) and is pivotally supported by the clutch disc (33). A second gear train for driving the output shaft (411) to generate a third rotation speed higher than the second rotation speed. 2. The first gear train (1) of the first transmission means (1)
2) is the input shaft (10) when the input shaft (10) rotates forward (R1).
The engaging pawl (1) that engages with the first ratchet (131) fixed to the
32) provided with a sun external gear (13), and an internal gear fixed to the boss (10a) holding the input shaft (10) so as to cover the outer periphery of the sun external gear (13). ring
(141) and a plurality of planetary gears (14) that mesh with these sun gears (13,141)
The input shaft side wheel (15) is composed of a sprocket that meshes with the chain (2) as a power transmission member, and the input shaft (1) is connected via a bearing (151).
0) is rotatably attached, the planetary gear (14) is rotatably supported on one side surface facing the sun gear (13, 141) on both side surfaces orthogonal to the axis of the input shaft side wheel (15), A meshing member (153) meshing with the ratchet means (16) is formed on the other side surface orthogonal to the axis, and the ratchet means (16) is a second ratchet slidably provided on the input shaft (10).
(161) and a wheel board (1) provided with engagement claws (162) that engage with the second ratchet (161) when the input shaft (10) rotates forward (R1).
60), and a meshing member that meshes with the meshing member (153) of the input shaft side wheel (15) on a side surface of the wheel board (160) that is opposite to the input shaft side wheel (15) on both sides orthogonal to the axis. (163) is formed, the clutch means (17) is slidably provided along the axial direction of the input shaft (10), and engages with the outer peripheral edge portion (164) of the wheel board (160). The transmission according to claim 1, further comprising an engagement recess (171). 3. The meshing member (1) of the input shaft side wheel (15)
53) and the meshing member (1) of the ratchet means (16)
63), each of which comprises flat ratchet teeth meshing with each other in the direction of rotation of the forward rotation (R1).
The described transmission. 4. A ball hole (168) formed in the input shaft (10).
A ball (166) spring-biased outward in the radial direction of the input shaft (10) is housed therein, and the ball (166) is provided at the proximal end of the ratchet means (16).
3. The transmission according to claim 2, wherein two ring-shaped recessed grooves (165, 165) engaging with are formed along the axial direction of the input shaft (10). 5. The first ratchet (131) is the input shaft.
When (10) rotates forward (R1), it engages with the engaging claw (132) of the sun external gear (13) and drives the sun external gear (13) in the forward rotation direction (R1). On the other hand, the sun external gear (13) is in the positive rotation direction at a speed faster than the rotation speed of the input shaft (10).
The transmission according to claim 2, wherein the transmission does not engage with the engagement claw (132) when rotating to (R1). 6. The output shaft side wheel (21) engages with the inner ratchet (25) fixed to the output shaft (411) and the inner ratchet (25) when rotating forward (R1). In addition, an engaging claw (24) for rotating the output shaft (411) in the forward rotation direction (R1) is provided, and a support ring (3
(1) is an outer ratchet (23) formed on the side surface orthogonal to the axis, and engages with the outer ratchet (23) when rotating forward (R1) to move the outer ratchet (23) in the forward rotation direction ( R1) is provided with an engaging claw (22) that is driven to rotate, and comprises a chain (2) as a power transmission member and a sprocket that meshes with the clutch disc (33). 31) A clutch convex piece that is provided so as to face the support ring (31) and that is engaged with the support ring (31) by the centrifugal force generated by the rotation of the output shaft (411). (331) between the clutch disc (33) and the support ring (31), the clutch disc (33) is connected to the support ring (31) only when the clutch disc (33) rotates forward (R1). Is provided with a coupling (30) for rotationally driving the outer ratchet (23), and the second gear train of the second speed change means (3) is a positive rotation (R1). When the output shaft (411) is engaged with the ratchet fixed to the output shaft (411), the output shaft (411) is rotated in the forward rotation direction (R1).
A sun external gear provided with an engaging claw (351) that is driven to rotate.
(35) and the sun external gear on the inner peripheral surface of the fixed shaft case (361).
An internal gear (36) provided so as to cover the outer periphery of (35), and a plurality of planetary gears (34) meshed with these sun gears (35, 36) and axially supported by the clutch disc (33). The transmission according to claim 1, further comprising: 7. The centrifugal clutch means (32) comprises a metal plate (32) on an inner surface of a friction shoe lining (324) made of an elastic material, which abuts on an inner peripheral surface of the clutch convex piece (331).
3) are integrally attached to each other and have a plurality of arcuate expansion clutch shoes (320), and an elastic means (322) interconnecting the adjacent expansion clutch shoes (320). 7. The transmission according to claim 6, wherein: 8. An expansion clutch shoe (320) having recesses (321) at both ends thereof and a plurality of outer surfaces formed on the inner peripheral surface of the metal plate (323) of the expansion clutch shoe (320). A supporting mortise (312) between the mortise (323a) and a plurality of inner mortises (313) formed on the outer peripheral surface of the support ring (31).
And the recess (32) of the adjacent expansion clutch shoe (320).
1) is formed on the outer peripheral surface of the support ring (31), and the expansion clutch shoe (311) is inserted between the expansion clutch shoe (311) and the expansion clutch shoe (3) when the support ring (31) rotates forward (R1). 7. The transmission according to claim 6, wherein the projection support block (311) is formed with an inclined surface for pressing the end portion of the (320) and expanding the expansion clutch shoe (320) outward in the radial direction. . 9. The coupling (30) is provided on an outer peripheral surface of an inner ring (306) of a clutch disc (33) provided so as to face the inner peripheral surface (301) of the support ring (31), A plurality of wedge-shaped portions (303) are formed so that the gap between the inner peripheral surface (301) and the inner peripheral surface (301) becomes smaller between the wedge-shaped portions (303) and the inner peripheral surface (301). Ball (3
The transmission according to claim 6, which is configured by disposing 04). 10. A second device connected to the second speed changing means (3).
The second second speed change means (3 ′) includes a second clutch disc (33 ′) rotatably provided on the output shaft (411), the second clutch disc (33 ′) and the sun external gear. Is provided between the output shaft (4) and the output shaft (411) when the output shaft (411) rotates at a predetermined speed higher than the third rotation speed.
Second centrifugal force clutch means (32 ') for engaging the sun external gear (35) and the second clutch disc (33') by the centrifugal force caused by the rotation of (11), and the second centrifugal force clutch. A second sun external gear provided on the output shaft (411) when the sun external gear (35) and the second clutch disc (33 ') are engaged by means (32').
(35 '), the second sun internal gear (36') fixed so as to cover the outer periphery of the second sun external gear (35 '), and the second sun internal gear (36').
The output shaft (411) is driven via the second planetary gear (34 ') which is meshed with the sun gears (35', 36 ') and is pivotally supported by the second clutch disc (33'), 2. The transmission according to claim 1, further comprising: a gear train that causes the output shaft (411) to generate a fourth rotation speed higher than the third rotation speed. 11. The transmission according to claim 1, wherein the input shaft (10) is connected to a bicycle pedal (11) and the output shaft (411) is an axle of a rear wheel (4) of the bicycle.