JPH0830503B2 - Transmission with auto-release mechanism - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a transmission with an automatic release mechanism provided in a vehicle such as a motorcycle.

[Conventional technology]

2. Description of the Related Art Some vehicles such as motorcycles and motorcycles are equipped with a transmission with an automatic release mechanism that can change gears without operating a clutch. This is a system in which a change pedal operated by a driver's foot is connected to a push rod of a multi-plate clutch interposed between an engine and a transmission.

The multi-plate clutch includes a clutch housing formed in a cylindrical shape with a bottom, and an outer peripheral portion fitted in a plurality of axially extending grooves formed in the cylindrical portion of the clutch housing at intervals in the circumferential direction. A plurality of annular plate-shaped friction plates, a pressure receiving plate portion facing the inner bottom surface of the clutch housing, and a cylindrical portion axially extending from the pressure receiving plate portion. On one side, a clutch boss arranged so that its axis line is the same as that of the clutch boss so as to be rotatable with respect to the clutch housing, and a plurality of shafts formed in the cylindrical portion of the clutch boss at intervals in the circumferential direction. A plurality of annular disc-shaped clutch plates arranged in the axial direction so that the inner peripheral portions thereof are fitted in the grooves extending in the direction and alternately overlap with the friction plates, and the clutch boss is advanced and retracted in the axial direction. Is connected to both the push rod is held in standing had a pressure plate which is biased so as to sandwich between the pressure receiving plate portion of the clutch boss said friction plate and the clutch plate by a clutch spring.

The conventional transmission with an automatic release mechanism is configured to press the push rod by the operation of the change pedal to hold the multi-plate clutch in the disengaged state and rotate the shift drum to switch the dog clutch. Was there.

[Problems to be Solved by the Invention]

However, in such a structure, there is a problem that a hitting sound is generated when shifting and the driver feels uncomfortable. This is because the operation with the foot does not allow a smooth clutch connection as in the case of using the clutch lever. That is, the power of the engine is rapidly transmitted to the dog clutch via the multi-plate clutch, so that the meshing portion on the engine side and the meshing portion on the wheel side of the dog clutch violently collide. More specifically, the dog clutch has a certain amount of clearance between the meshing parts to ensure smooth meshing.When the multi-plate clutch is disengaged, the meshing part on the wheel side meshes with the meshing part on the engine side. This is because the meshing portion on the engine side contacts the meshing portion on the wheel side so as to press in contact with each other so as to press the portion and the multi-plate clutch is connected. As a result, when the multi-plate clutch is momentarily connected, both meshing parts move relatively violently and a hit sound is generated.

[Means for solving the problem]

The present invention has been made in view of such circumstances, and provides a transmission device with an automatic release mechanism capable of preventing hitting sound from being generated during a shift. The transmission with an automatic release mechanism according to the present invention is formed on the clutch bosses of the remaining clutch plates other than the two clutch plates located at both axial ends of the clutch plates held side by side on the clutch boss of the multi-plate clutch. A portion of a large number of the grooves formed, which are fitted in at least two grooves that are equidistantly spaced from each other in the circumferential direction, are cut out, and the clutch plates at both axial ends that are fitted into the grooves are fitted. Between the parts, one clutch plate is fitted to a pin that stands upright in the groove so as to extend in the axial direction, and both clutch plates are urged in a direction to separate them from each other to disengage the clutch. Even in this state, a compression coil spring that keeps a slightly connected state is elastically mounted.

[Action]

According to the present invention, even when the multi-disc clutch is disengaged, the compression coil spring presses the clutch disc against the adjacent friction disc to transmit a small amount of power, so that the dog clutch is engaged on the engine side. Since the portion is kept pressing the meshing portion on the wheel side, both meshing portions of the dog clutch are prevented from colliding with each other when the multi-plate clutch is engaged.

〔Example〕

An embodiment of the present invention will be described in detail below with reference to the drawings.
FIG. 1 is a sectional view showing a multi-disc clutch which is a main part of a transmission with an automatic release mechanism according to the present invention, and FIG. 2 is a partial sectional view showing an engine unit equipped with a transmission with an automatic release mechanism. 3 is a sectional view taken along the line III-III in FIG.
In FIG. 2, reference numeral 1 indicates an engine unit mounted on, for example, a motorcycle. Like the conventional engine unit 1, the engine unit 1 is composed of an engine main body 2 arranged in the front part, a transmission 3 arranged in the rear part thereof, and the like. A crankshaft 4 of the engine body 2 is rotatably supported in the width direction, and a centrifugal clutch 5 is mounted on the right side through a one-way clutch. The centrifugal clutch 5 automatically connects the crankshaft 4 and the drive pinion 6 when the rotation speed of the crankshaft 4 increases.

In the transmission 3, an input shaft 7 and an output shaft 8 are rotatably mounted in parallel with the crankshaft 4, and a drive large gear 9 meshing with the drive small gear 6 is provided on the right side of the input shaft 7. It is rotatably supported, and a multi-plate clutch 11 is arranged outside thereof. On the other hand, a sprocket 12 is attached to the left end of the output shaft 8 to which a chain for driving wheels is attached.

The multi-plate clutch 11 is composed of a clutch housing 14 attached to the drive gear 9 by a pin 13 and a member such as a clutch boss 15 splined to the shaft end of the input shaft 7.

The clutch housing 14 is formed in a cylindrical shape having a bottom, and a groove 16 is cut in the axial direction in the peripheral wall which is a cylindrical portion,
A plurality of friction plates 17 are arranged in the axial direction so as to fit in the grooves 16. The friction plate 17 is the clutch boss 15 described above.
Is formed in a disk shape having a central hole into which is inserted. 18
Is a plurality of clutch plates interposed between friction plates 17, and is fitted in a groove 19 provided on the outer peripheral surface of the clutch boss 15 so as to be movable in the axial direction. As shown in FIGS. 1 and 4, the clutch boss 15 has a pressure receiving plate portion 15a facing the inner bottom surface of the clutch housing 14 formed in a bottomed cylindrical shape.
And a cylindrical portion 15b that extends in the axial direction from the pressure receiving plate portion 15a, is arranged inward of the clutch housing 14 so that the axis line is the same, and is rotatable with respect to the clutch housing 14. Is configured to be. The groove 19 is formed in the cylindrical portion 15b so as to extend in the axial direction.

Reference numeral 21 denotes a pressure plate which is arranged so as to face the clutch boss 15 and rotates integrally with the clutch boss 15. The friction plate 17 and the clutch plate 18 are rotated by the clutch spring 22.
Is urged so as to be sandwiched between the clutch boss 15 and the pressure receiving plate portion 15a. A push rod 23 penetrates the input shaft 7 and presses the pressure plate 21 to disconnect the multi-plate clutch 11.

The speed change device 3 is integrally provided on the input shaft 7 and has a first input gear 25, second and fourth input gears 26 and 27 rotatably supported on the input shaft 7, and a spline connection on the input shaft 7. Third
The input gear 28, the second output gear 29 press-fitted into the output shaft 8, and the first and third input gears 30, 3 rotatably supported on the output shaft 8.
1, the fourth output gear 32 splined on the output shaft 8
The gears are shifted by switching the meshing of the gears.
A dog clutch including 34a, 35a, 36a and a meshing portion 33b, 34b, 35b, 36b provided in a recess is provided.

A change pedal 41 is swingably supported on a support shaft (not shown). The change pedal 41 is connected to a push rod 23 and a cam drum (not shown) for shift operation, which has a cam groove. That is, when the change pedal 41 is operated with the foot, the push rod 23 is pressed to disconnect the multi-plate clutch 11 and the cam drum rotates, so that the third input gear is passed through a shift fork (not shown).
28 and the fourth output gear 32 are moved to change gears.

42 is the innermost clutch plate 18 in the multi-plate clutch 11.
A compression coil spring interposed between the outermost clutch plate 18 and the outermost clutch plate 18. The compression coil spring 42 is fitted on three pins 43 which are caulked and fixed to the innermost clutch plate 18 at equal intervals in the circumferential direction, and is housed in the groove 19 of the clutch boss 15. The length of the pin 43 is set so as not to contact the outermost clutch plate 18 even when the clutch is engaged. The elastic force of the compression coil spring 42 is a multi-plate clutch.
A weak urging force is constantly applied to the two clutch plates 18 which are a part of 11, and a slight connection between the clutch housing 14 and the clutch boss 15 is maintained even when the clutch is disengaged. It is set to such strength. That is, the compression coil spring 42 urges the innermost friction plate 17 toward the clutch boss 15 and the outermost friction plate 17 toward the pressure plate 21.

In the transmission with an automatic release mechanism configured as described above, the dog clutch of the transmission 3 can be switched by operating the change pedal 41 with the foot, so that the first speed to the fourth speed, the fourth speed to the first speed. It is possible to shift sequentially.

At this time of shifting, the push rod 23 is pressed by the operation of the change pedal 41 and the multi-plate clutch 11 is disengaged as shown in FIG.
Since the weak repulsive force of the above acts on the innermost and outermost clutch plates 18 to generate a frictional force on the front and back surfaces of the innermost and outer friction plates 17, the friction plate 17 and the clutch boss 15 are connected. Be kept in a state. Therefore, even when the multi-plate clutch 11 is disengaged, the power of the engine body 2 is slightly transmitted, and the dog clutch is kept in a state in which the engine side meshing portion presses the wheel side meshing portion. .

This will be described with reference to FIG. 5. In FIG. 5, the change pedal 41 is operated and the push rod 23 causes the multi-disc clutch 11 to operate.
When the gear is disconnected and the gear is shifted to the 2nd speed,
In order to explain the operation of the input gear 26 viewed from the side,
The meshing portion 33b recessed in the third input gear 28 serves as a meshing portion on the engine side, and the meshing portion 33a protruding in the second input gear 26.
Is a meshing portion on the wheel side. Where the third input gear
28, the power of the engine body 2 is slightly transmitted, and the rotation speed B of the second input gear 26 that rotates as the wheels rotate.
Since it rotates at a faster rotation speed A than the third input gear 28
The meshing portion 33b of the second input gear 26 comes into contact so as to press the meshing portion 33a of the second input gear 26.

Therefore, even if the change pedal 41 is momentarily returned to the original state and the multi-plate clutch 11 is suddenly connected, the meshing portion
Since 33a and the meshing portion 33b are kept in contact with each other,
The hitting sound is not generated by collision between the dog clutch engagement portions as in the conventional case.

Further, by accommodating the compression coil spring 42 in the clutch plate fitting groove 19 of the clutch boss 15 as shown in this embodiment, it is possible to prevent the multi-plate clutch 11 from increasing in size in the radial direction. That is, the compression coil spring 42 is attached to the groove 19
When it is arranged on the outer side in the radial direction of the multiple disc clutch, the inner diameter of the friction plate 17 on the clutch housing 14 side is set to the compression coil spring
It must be enlarged in order to avoid interference with 42, and when the area of the contact portion with the clutch plate 18 is secured, the diameter of the friction plate 7 becomes large, and as a result, the clutch housing 14 becomes large in diameter. However, this does not occur if the configuration of the present embodiment is adopted.

Moreover, since the compression coil springs 42 urge the clutch plates 18, 18 at both ends in the axial direction in the direction in which they are separated from each other, the compression coil springs 42 are positioned at one end portion in the axial direction and the clutch plates 18 positioned at one end in the axial direction are positioned. The compression coil spring 42 does not project in the axial direction from the clutch plate 18 as compared with the case where the compression coil spring 42 is brought into contact with the friction plate 17 and the clutch plate 18 as a whole to urge the friction plate 17 in the other axial direction. Therefore, it is possible to prevent the multi-plate clutch 11 from increasing in size in the axial direction.

Further, by adopting a configuration in which a pin is provided on the clutch plate at one end in the parallel installation direction and the compression coil spring is fitted to this pin, the clutch plate, the friction plate and the compression coil spring are integrally combined in the clutch. Since it can be incorporated in the boss, there is also an advantage that the multi-plate clutch can be easily assembled. That is, when the pin is erected on the clutch boss or the pressure plate, each clutch plate must be positioned in the clutch boss while being positioned in correspondence with the pin, but by adopting the above configuration, the assembly can be mounted on the clutch boss. When assembling, it is not necessary to consider the position of the pin at all, and it is sufficient to position both so that the fitting portion of the clutch plate fits in the groove of the clutch boss.

〔The invention's effect〕

As described above, according to the present invention, the clutch bosses formed on the remaining clutch plates except the two clutch plates located at both axial ends of the clutch plates held side by side on the clutch boss of the multi-plate clutch are formed. A portion of a large number of grooves that is fitted to at least two grooves that are equidistantly spaced from each other in the circumferential direction is cut away, and the fitting portions of the clutch plates at both axial ends that fit into these grooves are cut out. Between these clutch plates, one clutch plate is fitted to a pin that stands upright in the groove so as to extend in the axial direction, and both clutch plates are urged in a direction in which they are separated from each other. Even when the multi-plate clutch is disengaged, the dog clutch's meshing part presses the meshing part on the wheel side even if the multi-plate clutch is disengaged. It can be kept in that state.

Therefore, when the multi-plate clutch is connected, it is possible to prevent both meshing portions of the dog clutch from colliding with each other, and thus it is possible to prevent the hitting sound from being generated as in the conventional case and to make the driver feel uncomfortable. There is nothing to give.

Further, since the compression coil spring is housed in the clutch plate fitting groove of the clutch boss to urge the clutch plates at both ends in the axial direction, the multi-plate clutch may bite in the axial direction and the radial direction. Instead, a compression coil spring can be installed.

Further, by adopting a configuration in which a pin is provided on the clutch plate at one end in the parallel installation direction and the compression coil spring is fitted to this pin, the clutch plate, the friction plate and the compression coil spring are integrally combined in the clutch. Since it can be incorporated in the boss, there is also an effect that the multi-plate clutch can be easily assembled.

[Brief description of drawings]

FIG. 1 is a sectional view showing a multi-disc clutch which is a main part of a transmission with an automatic release mechanism according to the present invention, and FIG. 2 is a partial sectional view showing an engine unit equipped with a transmission with an automatic release mechanism. FIG. 3 is a sectional view taken along the line III-III in FIG. 1, FIG. 4 is a sectional view of an essential part showing a state in which the multiple disc clutch is disengaged, and FIG. FIG. 7 is a diagram for explaining the operation of the device viewed from the side. 7 ... Input shaft, 8 ... Output shaft, 11 ... Multi-disc clutch, 14
...... Clutch housing, 15 …… Clutch boss, 16 ……
Groove, 17 ... Friction plate, 18 ... Clutch plate, 19 ... Groove, 21 ...
… Pressure plate, 22 …… Clutch spring,
23 …… push rod, 41 …… change pedal, 42 ……
Compression coil spring, 43 ... pin.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshikazu Kawai 2500 Shinshinkai, Iwata-shi, Shizuoka Yamaha Motor Co., Ltd. (56) References JP 59-86716 (JP, A) JP, U) Actual development Sho 56-101223 (JP, U)

Claims (1)

[Claims] 1. A clutch housing formed in a bottomed cylindrical shape, and an outer peripheral portion fitted in a plurality of axially extending grooves formed in the cylindrical portion of the clutch housing at intervals in the circumferential direction. A plurality of annular plate-shaped friction plates,
The clutch housing has a pressure receiving plate portion facing the inner bottom surface of the clutch housing, and a cylindrical portion extending axially from the pressure receiving plate portion, and is arranged inward of the clutch housing so that the axis line thereof is the same. A clutch boss that is rotatably provided with respect to the inner peripheral portion of the clutch boss, the inner peripheral portion of which is fitted in a plurality of axially extending grooves formed in the cylindrical portion of the clutch boss at intervals in the circumferential direction. A plurality of annular plate-shaped clutch plates arranged in the axial direction so as to alternately overlap with the friction plates in a state of being positioned on both sides in the direction, and a change pedal which is held by the clutch boss so as to be movable back and forth along the axial direction. And a pressure play urged by a clutch spring to clamp the friction plate and the clutch plate between the pressure receiving plate portion of the clutch boss. A multi-disc clutch including a multi-disc clutch is interposed between a transmission that shifts the dog clutch to shift gears and the engine, and the multi-disc clutch is automatically disengaged during shifting by operating a change pedal. In the device, a part of a large number of grooves formed in a clutch boss in the remaining clutch plates other than the two clutch plates located at both ends in the axial direction of the plurality of arranged clutch plates, which are equidistant from each other in the circumferential direction. A portion that fits into at least two grooves that are spaced apart from each other is cut out, and one clutch plate is provided with a shaft in the groove between the fitting portions of the clutch plates at both ends in the axial direction that fit into this groove. The multi-plate clutch is always slightly connected even when the clutch is disengaged by being fitted to a pin that is erected so as to extend in the direction and urging both clutch plates in a direction in which they are separated from each other. Auto release mechanism with transmission apparatus characterized by being elastically compressed coil springs held in the state.