JP2015068422A - Clutch device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispose a release spring that enables setting of intermediate capacity in a clutch device while preventing increase in the size of a multiple disc clutch.SOLUTION: A clutch device includes: a gear change clutch mechanism 51 that has a pressure plate 93 for energizing a plurality of clutch discs 94 in a clutch engaging direction by using pressing force of a main spring 95 and a sub spring 97 and a lifter plate 96 for lifting the pressure plate 93 in the clutch disengaging direction; and an operation member 135 for lifting the lifter plate 96. An intermediate member 130 that can be displaced to the operation member 135 is disposed between the operation member 135 and the lifter plate 96. A release spring 131 for energizing the lifter plate 96 in the clutch disengaging direction in accordance with the operation amount of the operation member 135 is disposed between the operation member 135 and the intermediate member 130.

Description

  The present invention relates to a clutch device.

  Conventionally, in a clutch device, a pressure plate that urges a plurality of clutch plates in a clutch connection direction by a pressing force of a main spring, a lifter plate that is provided separately from the pressure plate, and lifts the pressure plate in a clutch disconnection direction; There is disclosed a multi-plate clutch that is disposed between a lifter plate and a pressure plate and includes a release spring that urges the pressure plate in a clutch disengagement direction according to the lift amount of the lifter plate (for example, Patent Document 1). reference). In Patent Document 1, the lifter plate is lifted in the clutch disengagement direction by rotating the movable lifter cam, which is an operation member, and the movable lifter cam and the fixed lifter cam cooperate via the ball member. It is configured. In this configuration, the release spring pressing amount increases in accordance with the lift amount of the lifter plate, and the clutch capacity gradually decreases. Therefore, the clutch capacity is easily set to an intermediate capacity between the clutch connection and the clutch disengagement. A clutch device capable of obtaining this intermediate capacity is suitable as a clutch of an automatic transmission, for example.

Japanese Patent Laying-Open No. 2005-249083

By the way, in the conventional clutch device, since the release spring is arranged in the assembly of the multi-plate clutch, the structure of the multi-plate clutch is complicated, and the size of the multi-plate clutch is easily increased. For this reason, depending on the arrangement of peripheral parts of the multi-plate clutch, it becomes difficult to provide the release spring in the multi-plate clutch.
The present invention has been made in view of the above-described circumstances, and an object thereof is to enable a release spring capable of setting an intermediate capacity to be disposed in a clutch device while preventing an increase in the size of a multi-plate clutch. To do.

In order to achieve the above object, the present invention provides a pressure plate (93) for urging a plurality of clutch plates (94) in the clutch engagement direction by the pressing force of the springs (95, 97), and the pressure plate (93). In the clutch device having a multi-plate clutch (51) having a lifter plate (96) for lifting the lifter plate (96) in the clutch disengagement direction and an operation member (135) for lifting the lifter plate (96), the operation member (135) An intermediate member (130) that is relatively displaceable with respect to the operation member (135) is disposed between the lifter plate (96) and the lifter plate (96) according to the amount of operation of the operation member (135). A release spring (131) that urges the clutch in the clutch disengagement direction includes the operating member (135) and the intermediate member ( It characterized in that it is arranged between the 30).
According to the present invention, by providing the release spring not on the multi-plate clutch side but on the operation member side, the release spring capable of setting the intermediate capacity of the clutch is prevented from increasing the size of the multi-plate clutch. Can be placed while.

Further, according to the present invention, the operation member (135) includes a fixed-side lifter cam (83) whose circumferential relative displacement is fixed to the clutch cover (30d) side, and the fixed-side lifter cam via the ball member (85). (83) is provided with a movable side lifter cam (84) for lifting the lifter plate (96), the movable side lifter cam (84) and the intermediate member (130) are fitted in-row, The release spring (131) is coiled between a cam side flange portion (133c) provided on the movable side lifter cam (84) side and an intermediate member side flange portion (143) provided on the intermediate member (130) side. It is provided as a spring.
According to the present invention, it is possible to displace the intermediate member with a simple configuration by in-row fitting, and to provide the release spring as a coil spring between the intermediate member and the movable-side lifter cam with a simple and compact configuration. be able to.

Further, according to the present invention, the movable-side lifter cam (84) and the intermediate member (130) both have a through hole (132d, 144) penetrating in the axial direction and a diameter from an inner wall of the through hole (132d, 144). Step portions (132c, 145) projecting inward in the direction are provided, inserted through the through-holes (132d, 144) of the movable side lifter cam (84) and the intermediate member (130), and the movable side lifter cam ( 84) and a collar member (140) having a flange portion (140b) to be engaged with one of the step portions (145) of the intermediate member (130) and having a female screw cut, are provided, and the movable side lifter cam ( 84) and a stopper member (146) locked to the other of the stepped portions (132c) of the intermediate member (130), the collar member (140) of the collar member (140) Characterized in that it is fixed by a bolt (147) which is fastened to the screw.
According to the present invention, the movable-side lifter cam, the intermediate member, and the release spring can be assembled with a simple structure by the collar member inserted through the through-hole of the movable-side lifter cam and the intermediate member. Can be formed with a simple structure.

Further, in the present invention, the release spring (131) is preloaded before the movable side lifter cam (84) is rotated, and the preload is received by the stopper member (146). It is characterized by that.
According to the present invention, the preload is released at the moment when the movable lifter cam rotates and moves, and the load for the preload acts in the clutch disengagement direction. For this reason, the clutch capacity can be reduced at a stretch by the amount corresponding to the preload, and the clutch capacity can be easily adjusted to the intermediate capacity.
Further, according to the present invention, the movable-side lifter cam (84) and the intermediate member (130) are fitted in-row so that the movable-side lifter cam (84) is positioned radially outward from the intermediate member (130). The bottom portion (149) of the inner peripheral surface of the in-row fitting portion of the movable-side lifter cam (84) is a portion of the in-row fitting portion of the intermediate member (130) after the movable-side lifter cam (84) is lifted by a predetermined amount. It is provided so that it may contact | abut with an edge part (141a).
According to the present invention, after the movable lifter cam is lifted by a predetermined amount, the lifter plate can be lifted directly by the movable lifter cam, and the clutch capacity can be reduced at a stretch.

Further, according to the present invention, the lifter plate (96) is urged in the clutch connection direction by a pressing force of the spring (97) to which a preload larger than the preload of the release spring (131) is applied. When the operation member (135) is operated by a predetermined amount, the preload of the release spring (131) is released, and the intermediate member (130) presses the lifter plate (96) in the clutch disengagement direction, and the operation member When the lifter plate (96) is further pressed in the clutch disengagement direction by the release spring (131) that is compressed as the operation amount of (135) increases, the operation amount of the operation member (135) further increases. The operating member (135) directly contacts the intermediate member (130), and the intermediate member (1 0) through, characterized in that pressing said lifter plate (96) in the direction of clutch disconnection.
According to the present invention, when the operation member is operated by a predetermined amount, the clutch capacity can be reduced by the amount of preload, and when the operation amount of the operation member increases, the release spring is compressed. When the operating member directly contacts the intermediate member, the lifter plate can be lifted directly by the operating member to further reduce the clutch capacity.

Further, according to the present invention, the pressure plate (93) for urging the plurality of clutch plates (94) in the clutch connecting direction by the pressing force of the springs (95, 97), and the pressure plate (93) in the clutch disengaging direction. A multi-plate clutch (51) having a lifter plate (96) to be lifted, a fixed-side lifter cam (283) whose relative displacement in the circumferential direction is fixed to the clutch cover (30d) side, and a ball member (85) In a clutch device including a movable lifter cam (284) that lifts the lifter plate (96) by cooperating with a fixed lifter cam (283), relative displacement is fixed in the circumferential direction with respect to the clutch cover (30d). And an anchor member (201) capable of relative displacement in the axial direction is provided on the fixed-side lifter. A release spring (231) provided between the clutch (283) and the clutch cover (30d) for urging the fixed lifter cam (283) in the clutch disengagement direction according to the rotation of the movable lifter cam (284). ) Is disposed between the anchor member (201) and the clutch cover (30d).
According to the present invention, the release spring is provided not between the multi-plate clutch side but between the anchor member provided between the fixed side lifter cam and the clutch cover and the clutch cover. A release spring that can be set can be arranged while preventing an increase in the size of the multi-plate clutch.

In the present invention, the clutch cover (30d) is provided with a hole (202) through which the anchor member (201) is inserted, and the anchor member (201) passes through the hole (202). A through collar portion (208) is provided, and a flange portion (206) extending in the radial direction is provided at a location closer to the clutch than the clutch cover (30d) of the through collar portion (208), and the through collar portion (208). A retaining ring member (209) for receiving an axial load of the release spring (231) is provided at a location protruding outward from the clutch cover (30d).
According to the present invention, the anchor member can be provided around the clutch cover so as to be relatively displaceable in the axial direction and capable of receiving the axial load of the release spring with a simple and compact configuration.

In the present invention, the release spring (231) is preloaded before the movable side lifter cam (284) is rotated, and the preload is received by the retaining ring member (209). It is characterized by being.
According to the present invention, the clutch capacity can be reduced at a stretch by the amount corresponding to the preload, and the clutch capacity can be easily adjusted to the intermediate capacity.
Furthermore, the present invention is characterized in that the release spring (231) is provided as a disc spring.
According to the present invention, since the release spring is provided as a disc spring, the release spring can be provided in a compact manner.

Further, according to the present invention, a clearance adjustment portion (211) protruding toward the clutch cover (30d) at a position radially inward of the flange portion (206) of the anchor member (201) with respect to the disc spring (231). ), And when the fixed lifter cam (283) moves a predetermined amount toward the clutch cover (30d), the clearance adjusting portion (211) contacts the clutch cover (30d).
According to the present invention, the amount of deformation of the disc spring caused by the rotation of the movable side lifter cam can be regulated by the clearance adjustment unit, and after the contact of the clearance adjustment unit, the lifter plate is directly lifted via the clearance adjustment unit. The capacity can be reduced.
Further, the present invention is characterized in that a cap member (212) is provided so as to cover an outward projecting portion of the clutch cover (30d) of the penetrating collar portion (208).
According to the present invention, oil leakage from the periphery of the through collar portion can be prevented by the cap member.

In the clutch device according to the present invention, the release spring capable of setting the intermediate capacity of the clutch can be arranged while preventing an increase in the size of the multi-plate clutch.
Further, the intermediate member can be provided with a simple configuration so as to be displaceable, and the release spring can be provided as a coil spring with a simple and compact configuration.
Further, an assembly including the movable lifter cam, the intermediate member, and the release spring can be formed with a simple structure.

Furthermore, the clutch capacity can be reduced at a stretch by the amount corresponding to the preload, and the clutch capacity can be easily adjusted to the intermediate capacity.
In addition, the lifter plate can be lifted directly by the movable lifter cam, and the clutch capacity can be reduced at once.
Further, when the operating member is operated by a predetermined amount, the clutch capacity can be reduced by the preload, and when the operating amount of the operating member increases, the clutch capacity is reduced by the amount that the release spring is compressed. If the operating member directly contacts the intermediate member, the lifter plate can be lifted directly by the operating member, and the clutch capacity can be further reduced.

In the clutch device according to the present invention, the anchor member can be provided around the clutch cover so as to be relatively displaceable in the axial direction and capable of receiving the axial load of the release spring with a simple and compact configuration.
Further, the clutch capacity can be easily adjusted to the intermediate capacity.
Furthermore, the release spring can be provided in a compact manner.
In addition, the lifter plate can be lifted directly via the clearance adjusting portion to reduce the clutch capacity.
Further, oil leakage from the periphery of the through collar portion can be prevented.

1 is a left side view of a motorcycle including a clutch device according to a first embodiment of the present invention. It is a cross-sectional top view of a power unit. It is sectional drawing which shows a gear change mechanism, an actuator mechanism, a clutch mechanism for transmission, and a clutch operation mechanism. It is sectional drawing of the clutch mechanism for transmission. It is sectional drawing which shows a clutch operation mechanism and a clutch mechanism for transmission. It is an enlarged view of a clutch operation mechanism. It is an example of the chart which shows the clutch capacity of the clutch mechanism for gear shifting. It is sectional drawing which shows the clutch operation mechanism of the initial state of 1st intermediate | middle capacity | capacitance. It is sectional drawing which shows the clutch operation mechanism of the state of the 2nd intermediate capacity | capacitance. It is sectional drawing which shows the state of the clutch mechanism for transmission corresponding to the state of a 2nd intermediate capacity | capacitance. It is sectional drawing which shows the clutch mechanism for transmission of the state of a cutting capacity. It is a graph which shows transition of the countershaft torque during a shift up, and a corresponding clutch capacity. It is sectional drawing of the clutch operation mechanism in 2nd Embodiment. It is an example of the chart which shows the clutch capacity of the clutch mechanism for gear shifting. It is sectional drawing which shows the clutch operation mechanism of the initial state of 1st intermediate | middle capacity | capacitance. It is sectional drawing which shows the clutch operation mechanism of the state of the 2nd intermediate capacity | capacitance.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[First Embodiment]
FIG. 1 is a left side view of a motorcycle 10 provided with a clutch device according to a first embodiment of the present invention.
The motorcycle 10 includes a handle 11 that is pivotally supported by a head pipe (not shown), a front wheel 12 that is steered by the handle 11, a rear wheel 13 that is a driving wheel, and a seat 14 on which a driver is seated. A power unit 16 that supplies driving force to the rear wheel 13 via a chain 15, a control unit 17 (control unit) that controls the power unit 16, and a battery 18.

  The motorcycle 10 is configured based on a body frame (not shown), and the body frame is covered with a body cover 19. The control unit 17 and the battery 18 are disposed below the seat 14 and inside the vehicle body cover 19. The power unit 16 is provided approximately in the middle between the front wheel 12 and the rear wheel 13 and slightly below the seat 14. The driver's step 20 is provided at the bottom of the power unit 16 as a pair of left and right.

  The power unit 16 includes an automatic transmission mechanism T (FIG. 2). The automatic transmission mechanism T includes a transmission 50 in which clutch connection / disconnection operation is automated. In the automatic transmission mechanism T, the switching of the shifting clutch mechanism 51 (FIG. 2) and the switching of the shift stage (shift) are automatically performed. Done in

Next, the configuration of the power unit 16 will be described.
FIG. 2 is a cross-sectional plan view of the power unit 16. In FIG. 2, the left-right direction corresponds to the vehicle width direction, the upward direction corresponds to the front of the vehicle, and the downward direction corresponds to the rear of the vehicle.
The power unit 16 generates the driving force of the engine 21, the generator 22, the starting clutch 24 provided on the crankshaft 23 of the engine 21, and the driving force of the crankshaft 23 output via the starting clutch 24. And an automatic transmission mechanism T for shifting and outputting.

  The power unit 16 is configured by integrally connecting a cylinder head 30a, a cylinder 30b, and a crankcase 30c. The crankshaft 23 is rotatably supported by a plurality of bearings 31. The engine 21 includes a piston 33 connected to the crankshaft 23 via a connecting rod 32, a spark plug 34, and a valve mechanism 36 that opens and closes a valve (not shown) to intake and exhaust the combustion chamber 35. The valve mechanism 36 is driven from the crankshaft 23 via a timing chain 36a.

  The starting clutch 24 connects and disconnects the crankshaft 23 and the primary gear 37 when starting and stopping, and is disposed at the right end of the crankshaft 23. The starting clutch 24 includes a cup-shaped outer case 39 fixed to one end of a sleeve 38 that can rotate relative to the outer periphery of the crankshaft 23, a primary gear 37 provided on the sleeve 38, and a right end of the crankshaft 23. An outer plate 40 fixed to the outer peripheral portion, a shoe 42 attached to an outer peripheral portion of the outer plate 40 via a weight 41 so as to face radially outward, and a spring 43 for urging the shoe 42 radially inward And have. In the starting clutch 24, the outer case 39 and the shoe 42 are separated when the engine speed is equal to or less than a predetermined value, and the crankshaft 23 and the automatic transmission mechanism T are disconnected from each other (disengaged state in which no power is transmitted). It has become. When the engine speed increases and exceeds a predetermined value, the weight 41 moves radially outward against the spring 43 by centrifugal force, so that the shoe 42 contacts the inner peripheral surface of the outer case 39. As a result, the rotation of the crankshaft 23 is transmitted to the primary gear 37 via the outer case 39, so that the power is transmitted.

  The crankcase 30c includes a clutch cover 30d on the right side surface that covers the start clutch 24 and the shift clutch mechanism 51 (multi-plate clutch). When the clutch cover 30d is removed, the starting clutch 24 and the shift clutch mechanism 51 are exposed to the outside.

The automatic transmission mechanism T includes a forward four-stage transmission 50, a transmission clutch mechanism 51 that switches connection between the crankshaft 23 side and the transmission 50, and a clutch operation mechanism 52 that operates the transmission clutch mechanism 51. A gear change mechanism 53 for shifting the transmission 50 and a clutch operation mechanism 52 and an actuator mechanism 54 (FIG. 3) for driving the gear change mechanism 53 are provided. The actuator mechanism 54 is controlled by the control unit 17 (FIG. 1).
The shift clutch mechanism 51 and the clutch operation mechanism 52 constitute a clutch device 48.

The automatic transmission mechanism T includes a mode switch (not shown) that switches between an automatic transmission (AT) mode and a manual transmission (MT) mode, and a shift select switch (not shown) that is operated by the driver to shift up or down. And connected to. Under the control of the control unit 17, the automatic transmission mechanism T controls the actuator mechanism 54 in accordance with the output signals of the sensors, the mode switch, and the shift select switch, and automatically or semi-automatically switches the shift stage of the transmission 50. It is configured to be able to.
That is, in the automatic transmission mode, the actuator mechanism 54 is controlled based on the vehicle speed or the like, and the transmission 50 is automatically shifted. In the manual shift mode, a shift is performed by operating the shift select switch by the driver.

  The transmission 50 shifts the rotation supplied from the shift clutch mechanism 51 based on an instruction from the control unit 17 and transmits the rotation to the rear wheel 13. The transmission 50 includes a main shaft 56 (main shaft) as an input shaft, a counter shaft 57 arranged in parallel to the main shaft 56, and drive gears 58a, 58b, 58c and 58d provided on the main shaft 56. The driven gears 59a, 59b, 59c and 59d provided on the counter shaft 57, the shift fork 60a engaged with the drive gear 58a, the shift fork 60b engaged with the driven gear 59c, and the shift forks 60a, 60b are shafts. A support shaft 61 that is slidable in the direction, and a shift drum 63 that slides the end portions of the shift forks 60a and 60b along the grooves 62a and 62b. The drive gears 58a, 58b, 58c and 58d mesh with the driven gears 59a, 59b, 59c and 59d in this order. When the drive gear 58b slides left and right, the side dog teeth engage with the adjacent drive gear 58a or 58c, and when the driven gear 59c slides left and right, the side dog teeth on the adjacent driven gear 59b or 59d. Engage.

  The drive gears 58a and 58c are held rotatably with respect to the main shaft 56, and the driven gears 59b and 59d are held rotatably with respect to the counter shaft 57. The drive gear 58b and the driven gear 59c are splined to the main shaft 56 and the counter shaft 57 and are slidable in the axial direction. The drive gear 58d and the driven gear 59a are fixed to the main shaft 56 and the counter shaft 57.

When the shift drum 63 is driven and rotated by the actuator mechanism 54, the shift forks 60a and 60b move in the axial direction along the grooves 62a and 62b of the shift drum 63, and the drive gear 58b and the driven gear 59c correspond to the gear position. Slide.
In the transmission 50, the transmission gear 58b and the driven gear 59c are selectively used between the main shaft 56 and the counter shaft 57 in the neutral state or between the first gear to the fourth gear. Power transmission was possible.

The main shaft 56 and the counter shaft 57 are rotatably held by bearings 64a, 64b, 66a, 66b.
A sprocket 67 is provided at the end of the counter shaft 57, and the sprocket 67 transmits rotation to the rear wheel 13 through the chain 15. A vehicle speed sensor 68 that detects the rotational speed of the counter shaft 57 in a non-contact manner is provided near the counter shaft 57. The rotational speed of the counter shaft 57 detected by the vehicle speed sensor 68 indicates the vehicle speed.
The engine 21 includes an input rotation sensor 45 that detects an input rotation speed from the crankshaft 23 to the shift clutch mechanism 51, and an output rotation sensor 46 that detects an output rotation speed of the main shaft 56. The motorcycle 10 also includes a throttle opening sensor (not shown) that detects the throttle opening of the intake device. The vehicle speed sensor 68, the input rotation sensor 45, the output rotation sensor 46, and the throttle opening sensor supply detection values to the control unit 17.

FIG. 3 is a cross-sectional view showing the gear change mechanism 53, the actuator mechanism 54, the speed change clutch mechanism 51, and the clutch operation mechanism 52.
2 and 3, the actuator mechanism 54 includes a motor 70, a shift spindle 71 that extends in the vehicle width direction in the crankcase 30c, and a gear train that decelerates the rotation of the motor 70 and drives the shift spindle 71 (see FIG. 2 and FIG. 3). (Not shown).
The shift spindle 71 is pivotally supported at both ends by the left side wall 30e and the clutch cover 30d of the crankcase 30c, and is also pivotally supported by an intermediate wall portion 30f that supports the bearing 64b of the main shaft 56. The clutch cover 30d is provided with an angle sensor 72 that detects the rotational position of the shift spindle 71.

The gear change mechanism 53 includes a gear shift arm 73 supported by the shift spindle 71 and a force storage mechanism 74 that stores the rotation of the shift spindle 71 and releases the stored force to rotate the gear shift arm 73.
The gear shift arm 73 is connected to the shift drum 63. When the gear shift arm 73 is rotated by the actuator mechanism 54, the shift drum 63 rotates and a shift is performed.

  The force accumulation mechanism 74 includes a rotation arm 75 provided on the shaft of the shift spindle 71 so as to be rotatable relative to the shift spindle 71, a return spring 76 that urges the gear shift arm 73 to a neutral position, and the shift spindle 71. A stopper collar 77 fixed on the shaft and rotating integrally with the shift spindle 71, and an accumulator fixed on the shaft of the shift spindle 71 at a position spaced apart from the stopper collar 77 in the axial direction and rotating integrally with the shift spindle 71. A pair of spring collars 79 a and 79 b provided on the shaft between the collar 78, the accumulator collar 78 and the stopper collar 77 so as to be rotatable relative to the shift spindle 71, and wound around the outer periphery of the spring collars 79 a and 79 b And an accumulator spring 80 provided to be attached.

The rotating arm 75 includes an inner cylindrical portion 75a that fits on the outer peripheral surface of the shift spindle 71, an arm side locking portion 75b that protrudes in the axial direction from the outer peripheral surface of the inner cylindrical portion 75a toward the energy storage spring 80, and an inner side. A pressing portion 75c that protrudes in the axial direction from the outer peripheral surface of the cylindrical portion 75a to the side opposite to the arm side locking portion 75b, and a dog hole 75d that opens to the stopper collar 77 side are provided.
The gear shift arm 73 includes an outer cylindrical portion 73a that fits on the outer peripheral surface of the inner cylindrical portion 75a of the rotating arm 75, and an arm portion 73b that extends from the outer cylindrical portion 73a to the outer side in the circumferential direction.
The gear shift arm 73 is provided so as to be rotatable relative to the rotation arm 75, and the pressing portion 75 c of the rotation arm 75 is inserted into a restriction opening 73 c formed in the arm portion 73 b of the gear shift arm 73.

  The return spring 76 is a torsion coil spring, is provided so as to be wound around the outer cylindrical portion 73a of the gear shift arm 73, and biases the gear shift arm 73 toward the neutral position via the pressing portion 75c. Here, the neutral position is a normal position where no speed change operation is performed. When the rotating arm 75 is rotated by a predetermined angle, the pressing portion 75c presses the inner edge portion of the restricting opening 73c and rotates the gear shift arm 73. A pin 88 erected on the intermediate wall 30f is inserted through the restriction opening 73c, and the pin 88 restricts the rotation range of the gear shift arm 73 through the restriction opening 73c.

The stopper collar 77 has dog teeth 77 a that are inserted into the dog holes 75 d of the rotating arm 75. When the stopper collar 77 rotates by a predetermined angle along with the rotation of the shift spindle 71, the dog teeth 77a urge the rotating arm 75 in the rotation direction via the inner edge of the dog hole 75d.
The accumulator collar 78 has a collar side locking portion 78a that protrudes in the axial direction toward the energy storage spring 80, and a clutch side dog tooth 78b that protrudes in the axial direction on the opposite side of the collar side locking portion 78a.
The force accumulation spring 80 is a torsion coil spring, one end of which is locked to the arm side locking portion 75 b of the rotating arm 75 and the other end is locked to the collar side locking portion 78 a of the power storage collar 78.

The gear shift arm 73 and the rotation arm 75 are constrained by the transmission 50 when the transmission clutch mechanism 51 is in a connected state and a driving force is generated in the transmission 50, and rotate on the shift spindle 71. Immovable. In this state, when the shift spindle 71 is rotated by the actuator mechanism 54, the force accumulation collar 78 rotates relative to the rotation arm 75, and one end of the force accumulation spring 80 is on the arm side locking portion 75b side. The other end on the side of the collar side locking portion 78a is deformed by being fixed, and starts accumulating. After that, when the speed change clutch mechanism 51 is disconnected, the gear shift arm 73 and the rotation arm 75 can be rotated to release the accumulated force, and the gear shift arm 73 is rotated by the accumulated force of the accumulation spring 80. It is pressed via the pressing portion 75c of the rotating arm 75 thus rotated. As a result, the shift drum 63 rotates and a shift is performed.
When the completion of the shift is detected based on the detection result of the angle sensor 72, the shift spindle 71 rotates in the reverse direction, the gear shift arm 73 returns to the original position, and the shift clutch mechanism 51 is connected.

  The accumulator spring 80 is deformed so that the axis of the coil-shaped portion is inclined with respect to the axis of the shift spindle 71 with the accumulating force, and both end portions 80a and 80b of the coil-shaped portion are divided into two in the axial direction. The spring collars 79a and 79b are in contact with each other. Specifically, the end portions 80a and 80b are in contact with the spring collars 79a and 79b at portions that differ by approximately 180 ° in the circumferential direction. In the first embodiment, since the spring collars 79a and 79b are divided in the axial direction and can be rotated relative to each other, when the both end portions 80a and 80b abut, the spring collars 79a and 79b Rotate independently so as to release the force. For this reason, the friction at the time of storing the power by twisting the power storage spring 80 can be reduced, and the power can be stored smoothly.

The clutch operation mechanism 52 includes a clutch lever 81 that is pivotally supported on the shift spindle 71 and operates when the clutch lever 81 rotates to operate connection and disconnection of the shift clutch mechanism 51. . Details of the clutch operating mechanism 52 will be described later.
The clutch lever 81 has a cylindrical portion 81a provided on the shift spindle 71 adjacent to the power storage collar 78, and a lever portion 81b extending radially outward from the cylindrical portion 81a. The cylinder portion 81a is formed with a clutch side dog hole 81c in which the clutch side dog teeth 78b of the accumulation collar 78 are engaged.

  The clutch side dog hole 81c of the clutch lever 81 has a larger width in the circumferential direction than the clutch side dog tooth 78b of the power accumulation collar 78. The clutch side dog tooth 78b has the power accumulation collar 78 of a predetermined angle. The clutch-side dog hole 81c is pressed in the circumferential direction for the first time when the clutch lever 81 is rotated, and the clutch lever 81 is rotated. Here, the predetermined angle of the power storage collar 78 is larger than the angle at which the power storage spring 80 stores a sufficient force. That is, in the first embodiment, after the accumulation of the accumulation spring 80 is completed, the clutch lever 81 is rotated to disengage the shift clutch mechanism 51 and the accumulation is released. For this reason, a speed change can be performed rapidly.

FIG. 4 is a cross-sectional view of the shift clutch mechanism 51.
As shown in FIGS. 2 to 4, a primary driven gear 69 that meshes with the primary gear 37 of the crankshaft 23 is supported at the shaft end of the main shaft 56 so as to be rotatable relative to the main shaft 56.
The transmission clutch mechanism 51 includes a cup-shaped clutch outer 91 that is fixed to the primary driven gear 69, a clutch center 92 that is provided on the radially inner side of the clutch outer 91 and is integrally fixed to the main shaft 56, and the main shaft 56. A pressure plate 93 movable in the axial direction, a clutch plate 94 provided between the pressure plate 93 and the clutch center 92, a main spring 95 for urging the pressure plate 93 in a direction in which the clutch is connected, and a clutch A lifter plate 96 that moves the pressure plate 93 in the cutting direction, and a subspring 97 that is sandwiched between the lifter plate 96 and the clutch center 92 are provided. The clutch center 92 and the pressure plate 93 are combined together to form a clutch inner 90 disposed inside the clutch outer 91.

The clutch outer 91 includes a disc portion 91a that is integrally fixed to the outer surface of the primary driven gear 69, and an outer cylindrical portion 91b that extends from the peripheral portion of the disc portion 91a in a substantially coaxial positional relationship with the main shaft 56. The clutch outer 91 can rotate relative to the main shaft 56 integrally with the primary driven gear 69.
The clutch center 92 includes a cylindrical hub portion 92a fixed to the main shaft 56, and a disk-shaped receiving plate portion 92b extending radially outward from the shaft end portion of the hub portion 92a to the vicinity of the inner peripheral surface of the clutch outer 91. With. A support hole 92c through which a part of the pressure plate 93 is inserted is formed in the receiving plate portion 92b. A plurality of support holes 92c are formed side by side in the circumferential direction of the receiving plate portion 92b. Further, the receiving plate portion 92b has a receiving surface 92d for receiving the clutch plate 94 on the outer peripheral portion, and a spring projecting toward the lifter plate 96 in an annular shape along the outer peripheral portion on the surface opposite to the receiving surface 92d. It has a holding projection 92e. The clutch center 92 is fixed to the main shaft 56 by spline fitting and a nut 89, and is not rotatable relative to the main shaft 56 and cannot move in the axial direction.

The pressure plate 93 includes an inner disk portion 93a disposed in the direction facing the receiving plate portion 92b of the clutch center 92 on the inner side of the clutch outer 91, and a disk portion of the clutch outer 91 from the peripheral edge portion of the inner disk portion 93a. On the 91a side, an inner cylindrical portion 93b extending in a substantially coaxial positional relationship with the main shaft 56 and a pressing plate portion 93c extending radially outward from the distal end portion of the inner cylindrical portion 93b to the vicinity of the inner peripheral surface of the clutch outer 91 are provided. The pressure plate 93 is formed to be rotatable relative to the clutch center 92 by a predetermined rotation angle.
The inner disc portion 93a is formed with a fitting hole 93d that is slidably fitted to the outer peripheral surface of the hub portion 92a of the clutch center 92. In addition, a release boss 99 extending through the support hole 92c of the clutch center 92 and extending toward the lifter plate 96 is formed around the fitting hole 93d in the inner disk portion 93a.

A plurality of release bosses 99 are formed side by side at substantially equal intervals in the circumferential direction of the inner disk part 93a. The release boss 99 has a columnar part 99a inserted into the support hole 92c and a guide shaft part 99b having a smaller diameter than the columnar part 99a at the tip, and the boundary between the guide shaft part 99b and the columnar part 99a. The step is formed with a step 99c having a diameter larger than that of the guide shaft 99b.
A stopper plate 105 composed of a washer having a diameter larger than that of the guide shaft portion 99b is provided on the distal end surface of the guide shaft portion 99b. The stopper plate 105 is screwed into the distal end surface of the guide shaft portion 99b. Therefore, it is fixed to the release boss 99.

The clutch plate 94 includes an outer friction plate 94a provided on the clutch outer 91 and an inner friction plate 94b provided on the clutch center 92. The outer friction plate 94a and the inner friction plate 94b are connected to the pressure plate 93, the clutch center 92, and the like. A plurality of sheets are alternately stacked in between. Each outer friction plate 94 a is supported by spline fitting to the outer cylindrical portion 91 b of the clutch outer 91, and is provided so as to be movable in the axial direction of the clutch outer 91 and not rotatable with respect to the clutch outer 91.
Each inner friction plate 94 b is supported by serration fitting on the outer peripheral surface of the inner cylindrical portion 93 b of the pressure plate 93, and is provided so as to be movable in the axial direction of the pressure plate 93 and not rotatable relative to the pressure plate 93. Yes.

A plate-like back torque limit member 101 is fixed to the inner disk part 93 a inside the inner cylindrical part 93 b of the pressure plate 93. The back torque limit member 101 is fixed by a bolt 108 provided coaxially with the fixing bolt 106.
The back torque limit member 101 and the lifter pin 120 fixed to the receiving plate portion 92b of the clutch center 92 constitute a back torque limiter mechanism. The back torque limiter mechanism is a known one described in, for example, Japanese Patent Laid-Open No. 8-93786, and the clutch is engaged when a torque of a predetermined value or more acts in the direction opposite to the forward power transmission. It is a mechanism which makes a half clutch state from.

The back torque limit member 101 includes a cam portion 101b (FIG. 3) that penetrates the pressure plate 93 and engages the lifter pin. When a back torque of a predetermined value or more is applied from the rear wheel 13 side, the pressure plate 93 rotates relative to the clutch center 92, so that the cam portion 101b slides on the lifter pin 120, and the pressure plate 93 is disengaged from the clutch. Move in the direction. According to the back torque limiter mechanism, the shift shock caused by the back torque can be reduced.
A ring-shaped clip 102 is fitted on the outer peripheral surface of the hub portion 92 a of the clutch center 92 on the disk portion 91 a side, and the clip 102 supports a ring-shaped retainer 103 that receives the main spring 95.

The main spring 95 is a ring-shaped disc spring and is sandwiched between the back torque limit member 101 and the retainer 103 on the pressure plate 93 side. Specifically, the main spring 95 is disposed between the hub portion 92a of the clutch center 92 and the inner cylindrical portion 93b of the pressure plate 93, and the outer diameter portion is supported by the back torque limit member 101 via the spring receiving member 101a. The inner diameter portion is supported by the retainer 103.
The main spring 95 biases the pressure plate 93 in a direction in which the pressure plate 93 and the clutch center 92 hold the clutch plate 94, that is, a direction in which the clutch is connected.

The lifter plate 96 is formed in a disc shape, and is disposed between the clutch center 92 and the transmission clutch mechanism 51 (FIG. 3). The lifter plate 96 includes a bearing support hole 96a into which the ball bearing 87 is fitted, and a hole 96b into which the release boss 99 of the pressure plate 93 is inserted.
An outer ring of a ball bearing 87 is fitted into the bearing support hole 96a, and an inner ring of the ball bearing 87 is fitted into the speed change clutch mechanism 51. Therefore, the lifter plate 96 can move in the axial direction together with the shift clutch mechanism 51 and can rotate relative to the shift clutch mechanism 51.

The hole portion 96b is a hole having a smaller diameter than the stopper plate 105 and the step portion 99c, and a contact surface 96c substantially parallel to the step portion 99c is formed on the peripheral portion of the hole portion 96b.
A plurality of holes 96b are formed around a bearing support hole 96a provided at the center of the lifter plate 96. Each hole 96b fits into the guide shaft 99b of each release boss 99. The lifter plate 96 is connected to the pressure plate 93 by fixing the stopper plate 105 and the fixing bolt 106 after the holes 96b are fitted into the guide shaft portions 99b.

The lifter plate 96 has a sub-spring receiving portion 96 d that receives the sub-spring 97 on a surface facing the receiving plate portion 92 b of the clutch center 92. The sub-spring receiving portion 96d is located on the outer side in the radial direction than each hole portion 96b.
The sub spring 97 is a ring-shaped disc spring, and is sandwiched between the sub spring receiving portion 96 d of the lifter plate 96 and the receiving plate portion 92 b of the clutch center 92. Specifically, the sub spring 97 is supported by the clutch center 92 at the outer diameter portion through the receiving member 107a disposed inside the spring holding convex portion 92e, and is received at the sub spring receiving portion 96d. The lifter plate 96 supports the member 107b.

The sub-spring 97 uses a clutch center 92 fixed to the main shaft 56 as a spring seat, and urges the lifter plate 96 in a direction to abut against the stopper plate 105. The biasing force of the sub spring 97 is transmitted to the pressure plate 93 via the lifter plate 96, the stopper plate 105, and the fixing bolt 106, and the pressure plate 93 is pulled toward the sub spring 97 so that the clutch plate 94 is pulled. Press. That is, the urging direction of the sub-spring 97 is the same as the urging direction of the main spring 95 and is the clutch connection direction.
The lifter plate 96 also functions as a sub pressure plate that urges the pressure plate 93 in the clutch engagement direction via the sub spring 97.

In the clutch connected state, the clutch plate 94 is held by the urging force of the main spring 95 and the sub spring 97, and the rotation of the clutch outer 91 rotated by the primary gear 37 can be transmitted to the clutch center 92 via the clutch plate 94. Thus, the main shaft 56 is rotated integrally with the clutch center 92.
When the pressure plate 93 is moved against the urging force of the main spring 95 and the sub-spring 97 via the speed change clutch mechanism 51, the clutch plate 94 is released from being held in a clutch disengaged state.

The thickness of the portion of the contact surface 96c in the lifter plate 96 is formed to be smaller than the length of the guide shaft portion 99b. When the clutch is connected, the step 99c of the release boss 99 and the contact surface 96c A gap G is formed between them.
When the clutch lever 81 is rotated with the rotation of the shift spindle 71 and the shift clutch mechanism 51 is moved in the axial direction, the lifter plate 96 is pressed via the ball bearing 87 and lifted away from the stopper plate 105. Then, it moves to the clutch center 92 side so as to reduce the gap G.

FIG. 5 is a cross-sectional view showing the clutch operating mechanism 52 and the shift clutch mechanism 51. FIG. 6 is an enlarged view of the clutch operation mechanism 52.
The clutch operating mechanism 52 includes the clutch lever 81, a support shaft 82 fixed to the clutch cover 30d, and a fixed-side lifter cam 83 fixed to the support shaft 82. The clutch operating mechanism 52 is coupled to the clutch lever 81 and is sandwiched between the movable side lifter cam 84 provided to face the fixed side lifter cam 83, and the movable side lifter cam 84 and the fixed side lifter cam 83. A plurality of balls 85 (ball members) and an intermediate member 130 provided between the movable lifter cam 84 and the lifter plate 96 are provided. Furthermore, the clutch operation mechanism 52 includes a release spring 131 that is compressed between the movable-side lifter cam 84 and the intermediate member 130, and a collar member 140 that regulates the position of the intermediate member 130 in the axial direction.

The support shaft 82 is erected on the inner surface of the clutch cover 30d so as to be substantially coaxial with the main shaft 56. The support shaft 82 includes a flange 82a that is in contact with the inner surface of the clutch cover 30d, a fixing portion 82b that protrudes outward from the clutch cover 30d and is fixed to the outer surface by a nut 82c, and protrudes toward the shifting clutch mechanism 51 side. And a support shaft portion 82d to which the lifter cam 83 is fixed.
The fixed-side lifter cam 83 is a guide cylinder part 83a that is fitted and coupled to the outer periphery of the support shaft part 82d, and a hook-shaped receiving plate part that protrudes radially outward from the end of the guide cylinder part 83a on the clutch cover 30d side. 83b. The fixed-side lifter cam 83 is fixed to the support shaft 82 and cannot be rotated.

The movable-side lifter cam 84 includes a cylindrical tubular portion 132, a bowl-shaped receiving plate portion 133 protruding radially outward from an end of the tubular portion 132 on the fixed-side lifter cam 83 side, and a part of the receiving plate portion 133. And a rod-shaped connecting portion 134 that protrudes toward the shift spindle 71.
The movable side lifter cam 84 is connected to the lever portion 81 b of the clutch lever 81 via a pin 86 provided on the connecting portion 134.
The cylindrical portion 132 of the movable-side lifter cam 84 is provided with a through-hole penetrating in the axial direction at the center, and this through-hole has a fitting hole intermediate diameter portion 132a fitted to the outer peripheral surface of the support shaft portion 82d, and an intermediate member. 130 has a fitting hole large diameter portion 132b (in-row fitting portion) into which 130 is fitted. The movable-side lifter cam 84 is rotatable about the guide tube portion 83a of the fixed-side lifter cam 83, and is slidable in the axial direction with respect to the guide tube portion 83a.

A lifter-side stepped portion 132c that protrudes radially inward from the inner peripheral surface of the fitting hole large diameter portion 132b is formed at the boundary between the fitting hole medium diameter portion 132a and the fitting hole large diameter portion 132b. . The inner peripheral portion of the lifter side step portion 132c is a through-hole small-diameter portion 132d through which the collar member 140 is inserted.
The fitting hole medium diameter part 132a, the fitting hole large diameter part 132b, and the through hole small diameter part 132d are provided coaxially, and the fitting hole large diameter part 132b is larger in diameter than the fitting hole medium diameter part 132a. .

A plurality of balls 85 are sandwiched between the movable-side lifter cam 84 and the fixed-side lifter cam 83. A plurality of ball support grooves 83c and 133a in which the balls 85 are disposed are provided on the surfaces of the receiving plate portion 83b and the receiving plate portion 133 facing each other in the circumferential direction. The ball support groove 133a has a sloped cam portion 133b whose height changes in the circumferential direction.
When the clutch lever 81 is rotated, the movable side lifter cam 84 is rotated about the guide cylinder portion 83 a of the fixed side lifter cam 83 via the clutch lever 81, and the cam portion 133 b slides with respect to the ball 85. , Move in the axial direction.
The movable-side lifter cam 84, the fixed-side lifter cam 83, and the ball 85 constitute an operation member 135 that operates the shift clutch mechanism 51 in cooperation with each other. The ball 85 is not limited to the ball, and may be, for example, a roller-shaped roller member.

The release spring 131 is a coil spring, and the inner peripheral portion thereof is fitted to the outer peripheral portion of the cylindrical portion 132 of the movable lifter cam 84. One end of the release spring 131 is received by a cam side flange portion 133 c formed on the receiving plate portion 133 of the movable side lifter cam 84.
The intermediate member 130 includes a cylindrical tubular body 136 and an intermediate member-side fitting portion 141 (in-row fitting) that is formed at one end of the tubular body 136 and is fitted into the fitting hole large-diameter portion 132b of the movable-side lifter cam 84. And a bearing fixing portion 142 which is formed at the other end of the cylindrical body 136 and into which the inner ring of the ball bearing 87 is fitted to the outer periphery. An intermediate member-side flange portion 143 that protrudes radially outward is formed at the axial intermediate portion of the cylindrical body 136. The intermediate member-side flange portion 143 includes a spring receiving portion 143a that receives the other end of the release spring 131, and a flat portion 143b that faces the distal end portion of the tubular portion 132 of the movable-side lifter cam 84 on the inner peripheral side of the spring receiving portion 143a. Have

  The intermediate member 130 has a through-hole 144 passing through in the axial direction in the center, and the through-hole 144 has an intermediate member-side stepped portion 145 protruding radially inward at a portion corresponding to the intermediate member-side fitting portion 141. Have. The inner peripheral portion of the intermediate member side step portion 145 is a fitting hole small diameter portion 144a into which the collar member 140 is fitted. The remaining part of the through hole 144 is a hole 144b having a larger diameter than the fitting hole small diameter part 144a. A groove 144c extending in the axial direction is formed in a part of the inner peripheral portion of the hole 144b.

The collar member 140 includes a cylindrical collar main body portion 140a, a collar side flange portion 140b projecting radially outward from an outer peripheral portion of one end of the color main body portion 140a, and a screw hole portion 140c penetrating the collar member 140 in the axial direction. And have. A female screw is formed in the screw hole 140c.
A stopper member 146 having a diameter larger than that of the color main body 140a is attached to the end surface of the other end of the color main body 140a. The stopper member 146 is a washer, and is held and fixed by a stopper member fixing bolt 147 inserted from the other end of the collar main body portion 140a into the screw hole portion 140c.
The collar side flange portion 140b is formed with a protrusion 140d that protrudes outward and fits into the groove 144c of the intermediate member 130. The collar member 140 is prevented from rotating by the projection 140d fitting in the groove 144c.

The movable-side lifter cam 84, the intermediate member 130, the release spring 131, the collar member 140, the stopper member 146, and the stopper member fixing bolt 147 are assembled in advance to form a small assembly 148.
In the small assembly 148, the movable side lifter cam 84 and the intermediate member 130 are connected by the collar member 140, the stopper member 146, and the stopper member fixing bolt 147.

In the intermediate member 130, the intermediate member side fitting portion 141 is in-row fitted to the inner peripheral portion of the fitting hole large diameter portion 132 b of the movable side lifter cam 84. In the in-row fitting, the intermediate member-side fitting portion 141 and the fitting hole large-diameter portion 132b are slidably fitted to each other, and the movable-side lifter cam 84 is relative to the intermediate member 130 in the circumferential direction. Rotation is restricted and sliding is possible in the axial direction. Note that the relative rotation in the circumferential direction between the movable lifter cam 84 and the intermediate member 130 is regulated by the preload applied to the release spring 131 and the end surface of the release spring 131 and the seat (the cam side flange portion 133c and the intermediate member side flange portion 143). ) And the rigidity of the release spring 131. Here, in order to more reliably restrict the relative rotation of the movable-side lifter cam 84 and the intermediate member 130 in the circumferential direction, for example, a groove (not shown) is formed in the inner periphery of the fitting hole large-diameter portion 132b of the movable-side lifter cam 84. And a protrusion (not shown) that engages with the groove may be provided on the outer periphery of the intermediate member 130.
The collar member 140 is inserted into the fitting hole small diameter portion 144a from the hole 144b side of the intermediate member 130, and is inserted to a depth where the collar side flange portion 140b at one end contacts the intermediate member side step portion 145.
The other end of the intermediate member 130 is inserted through the through-hole small-diameter portion 132d of the movable-side lifter cam 84 to the fitting hole medium-diameter portion 132a, and the stopper member 146 is inserted into the fitting hole medium-diameter portion 132a. Fixed by. The stopper member 146 comes into contact with the lifter side stepped portion 132c from the fitting hole middle diameter portion 132a side.

In the small assembly 148, the release spring 131 is held in a compressed state between the cam-side flange portion 133 c of the movable-side lifter cam 84 and the spring receiving portion 143 a of the intermediate member 130. That is, a preload having a predetermined size is attached to the release spring 131. In FIG. 6, the load transmission path of the release spring 131 is schematically indicated by an arrow. The preload acts so as to separate the movable lifter cam 84 and the intermediate member 130 in the axial direction. The preload is received by the collar-side flange portion 140b and the stopper member 146. The size of the preload is adjusted by changing the distance between the collar-side flange portion 140b and the stopper member 146.
In a natural state where no external force is applied to the small assembly 148 in the axial direction, the inner peripheral surface bottom portion 149 which is the bottom portion of the fitting hole large diameter portion 132b and the distal end surface 141a of the intermediate member side fitting portion 141 of the intermediate member 130 are provided. An initial gap F is formed between the two.

FIG. 7 is an example of a chart showing the clutch capacity of the shift clutch mechanism 51.
As shown in FIG. 7, in the first embodiment, the clutch capacity of the shift clutch mechanism 51 is variable in a plurality of stages. Specifically, the clutch capacity includes a maximum capacity C1 in which the clutch capacity is determined by the urging force of the main spring 95 and the sub spring 97, a first intermediate capacity C2 in which a part of the urging force of the sub spring 97 is reduced, and the sub spring. All of the urging force 97 are reduced to have a second intermediate capacity C3 determined by the urging force of the main spring 95, and a cutting capacity C4 from which all the urging force of the main spring 95 is removed.

The maximum capacity C1 is obtained in the clutch engaged state shown in FIGS. In the clutch connected state, the lifter plate 96 is in contact with the stopper plate 105, and the urging force of the sub spring 97 is transmitted to the pressure plate 93 via the lifter plate 96 and the stopper plate 105. For this reason, the urging force with which the pressure plate 93 presses the clutch plate 94 includes a main spring load S1 (FIG. 7) which is a preload of the main spring 95 and a subspring load S2 (FIG. 7) which is a preload of the subspring 97. Will be the maximum, and will be the maximum.
That is, the lifter plate 96 and the stopper plate 105 constitute a sub spring load transmission path K (FIG. 4) that transmits the urging force of the sub spring 97 to the pressure plate 93.

In the state of the maximum capacity C1, as shown in FIG. 6, in the clutch operation mechanism 52, the preload of the release spring 131 is received by the collar side flange portion 140b and the stopper member 146. Further, in the state of the maximum capacity C1, an initial gap F is formed between the inner peripheral surface bottom portion 149 and the front end surface 141a of the intermediate member-side fitting portion 141 of the intermediate member 130.
That is, in the state of the maximum capacity C1, the preload of the release spring 131 does not affect the clutch capacity. Here, the preload of the release spring 131 is shown in FIG. 7 as the release spring initial load Rp.

FIG. 8 is a cross-sectional view showing the clutch operating mechanism 52 in the initial state of the first intermediate capacitor C2. Here, in FIG. 8, the load transmission path of the release spring 131 is schematically indicated by an arrow. FIG. 4 shows the state of the shift clutch mechanism 51 corresponding to the initial state of the first intermediate capacity C2.
When the movable lifter cam 84 rotates to a predetermined amount M1 with the rotation of the shift spindle 71 by the actuator mechanism 54 (FIG. 3), the movable lifter cam 84 rides on the ball 85 and moves toward the lifter plate 96, that is, the initial gap F. Slide it a predetermined amount in the direction to decrease. As a result, the movable-side lifter cam 84 moves relative to the intermediate member 130, and the lifter-side step portion 132 c is separated from the stopper member 146 by the gap H. At the moment when the gap H is formed, the release spring initial load Rp received by the stopper member 146 is released and the release spring initial load Rp is applied to the intermediate member 130 and the ball bearing 87 as shown by arrows in FIG. Via the lifter plate 96. The release spring initial load Rp is a load acting in the opposite direction to the sub-spring 97, and acts in the clutch disengagement direction.
Here, the gap H should be larger than zero.

Since the sub-spring load S2 is set to be larger than the release spring initial load Rp, even if the release spring initial load Rp is released, the lifter plate 96 is not displaced in the axial direction as shown in FIG. The contact with the stopper plate 105 remains.
Even if the release spring initial load Rp is released, the lifter plate 96 is not displaced, but as shown in FIG. 7, the sub spring load S2 is reduced by the amount of the release spring initial load Rp. For this reason, at the moment when the gap H is formed, the clutch capacity decreases at a stretch and changes from the maximum capacity C1 to the first intermediate capacity C2.

As the actuator mechanism 54 is driven, the movable-side lifter cam 84 continues to move toward the lifter plate 96, and when the amount of rotation of the movable-side lifter cam 84 reaches a predetermined amount M2, the initial gap F becomes 0 and the inner circumference The bottom surface portion 149 contacts the front end surface 141 a of the intermediate member 130.
The first intermediate capacity C2 is obtained in a section where the rotation amount of the movable lifter cam 84 changes from the predetermined amount M1 to the predetermined amount M2.

Specifically, as the moving amount of the movable lifter cam 84 in the axial direction increases, the release spring 131 is gradually compressed, and the release spring load R (FIG. 7) of the release spring 131 increases substantially linearly. For this reason, between the predetermined amount M1 and the predetermined amount M2, the sub spring load S2 is gradually reduced by an increase of the release spring load R, and the first intermediate capacity C2 is also accompanied by the amount of rotation of the movable lifter cam 84. The characteristic gradually decreases. In the first embodiment, since the section of play by the initial gap F is provided, the section in which the first intermediate capacity C2 can be obtained can be lengthened, and the clutch capacity can be increased without making parts and control methods highly accurate. It can be made variable to a predetermined intermediate capacity.
Further, the release spring load R is set so as not to exceed the sub spring load S2 even when the release spring load R reaches the predetermined amount M2. For this reason, even in the state of the predetermined amount M2, the lifter plate 96 is not displaced in the axial direction but remains in contact with the stopper plate 105.

FIG. 9 is a cross-sectional view showing the clutch operating mechanism 52 in the state of the second intermediate capacity C3. FIG. 10 is a cross-sectional view showing the state of the shift clutch mechanism 51 corresponding to the state of the second intermediate capacity C3.
When the amount of rotation of the movable side lifter cam 84 further increases from the predetermined amount M2, the movable side lifter cam 84 directly presses the intermediate member 130 via the inner peripheral surface bottom portion 149 and moves the lifter plate 96 in the clutch disengagement direction.
Specifically, the movable-side lifter cam 84 starts to directly push the intermediate member 130 only by the amount of rotation of the movable-side lifter cam 84 being slightly larger than the predetermined amount M2. By this direct pushing, as shown in FIG. 10, the lifter plate 96 is lifted to the stepped portion 99 c side along the guide shaft portion 99 b against the urging force of the sub spring 97, and is separated from the stopper plate 105.

  When the lifter plate 96 is separated from the stopper plate 105, the sub spring load transmission path K is cut off, the sub spring load S2 is not transmitted to the pressure plate 93, and the clutch capacity is determined only by the main spring load S1. It becomes like this. For this reason, as shown in FIG. 7, the clutch capacity decreases from the first intermediate capacity C2 to the second intermediate capacity C3 at the moment when the lifter plate 96 is separated from the stopper plate 105. The first predetermined lift amount L1 of the lifter plate 96 that blocks the sub-spring load transmission path K may be larger than zero.

  When the movement of the movable side lifter cam 84 is continued after the lifter plate 96 is separated from the stopper plate 105, the direct pushing by the movable side lifter cam 84 is also continued, and the lifter plate 96 further moves to the step 99c side. continue. A section from when the lifter plate 96 is separated from the stopper plate 105 to contact with the stepped portion 99c is a section of the second intermediate capacity C3. In this section, the lifter plate 96 only moves relative to the stepped portion 99c and does not affect the main spring load S1. For this reason, as shown in FIG. 7, in the section of the second intermediate capacity C3, the clutch capacity is determined only by the main spring 95, and the second intermediate capacity C3 is constant. In the first embodiment, since the play by the gap G is provided, the section in which the second intermediate capacity C3 can be obtained can be lengthened, and the clutch capacity can be made variable without making the parts and the control method highly accurate. .

FIG. 11 is a cross-sectional view showing the shift clutch mechanism 51 in the state of the cutting capacity C4.
When the lifter plate 96 is moved by the second predetermined lift amount L2 by the movable-side lifter cam 84 and the lifter plate 96 comes into contact with the step 99c, the pressure plate 93 is pressed by the lifter plate 96 and attached to the main spring 95. Moves in the clutch disengagement direction against the force. More specifically, when the pressure plate 93 is slightly pressed in the clutch disengagement direction, the clutch plate 94 held between the pressure plate 93 and the clutch center 92 is released, and the clutch capacity becomes zero.

FIG. 12 is a chart showing the transition of the countershaft torque during the upshift and the corresponding clutch capacity.
The control unit 17 drives the actuator mechanism 54 based on the torque of the counter shaft 57 and selects a clutch capacity that can reduce a shift shock when performing automatic shifting. For example, when shifting up from the first speed to the second speed, the control unit 17 determines the maximum capacity C1, the first intermediate capacity C2, and the like so as to reduce the shift shock based on the detected torque of the counter shaft 57 before the shift. After selecting one of the second intermediate capacities C3 and shifting the gear train of the transmission 50, the shift clutch mechanism 51 is connected with the selected clutch capacity. Specifically, the clutch capacity C of the shift clutch mechanism 51 is such that the clutch shaft torque T1 before the shift and the counter shaft torque T2 after the shift are not relatively separated from the band. Is selected.
As a result, it is possible to appropriately absorb the rotational difference between the countershaft 57 side and the crankshaft 23 side by the shift clutch mechanism 51, and shift shock can be reduced. Here, the torque of the counter shaft 57 before and after the shift is obtained based on, for example, a map that stores the relationship among the engine speed, the throttle opening, and the torque of the counter shaft 57.

  As described above, according to the first embodiment to which the present invention is applied, the clutch device 48 biases the plurality of clutch plates 94 in the clutch engagement direction by the pressing force of the main spring 95 and the sub spring 97. The shift mechanism 51 includes a pressure plate 93 and a lifter plate 96 that lifts the pressure plate 93 in the clutch disengagement direction, and an operation member 135 that lifts the lifter plate 96. The operation member 135 and the lifter plate 96 An intermediate member 130 that is relatively displaceable with respect to the operation member 135 is disposed therebetween, and a release spring 131 that urges the lifter plate 96 in the clutch disengagement direction according to the amount of operation of the operation member 135 is intermediate between the operation member 135 and It arrange | positions between the members 130. FIG. In this way, by providing the release spring 131 on the operation member 135 side instead of the speed change clutch mechanism 51 side, the release spring 131 capable of setting the first intermediate capacity C2 is provided on the speed change clutch mechanism 51 side. It can be placed while preventing an increase in size.

  The operating member 135 is a movable side that lifts the lifter plate 96 by cooperating with the fixed-side lifter cam 83 via the ball 85 and the fixed-side lifter cam 83 fixed to the clutch cover 30d side in the circumferential direction. A lifter cam 84, and the movable side lifter cam 84 and the intermediate member 130 are in-row fitted. A cam side flange portion 133c provided on the movable side lifter cam 84 side, and an intermediate member side flange portion 143 provided on the intermediate member 130 side. In the meantime, a release spring 131 is provided as a coil spring. Accordingly, the intermediate member 130 can be provided so as to be displaceable with a simple configuration by in-row fitting, and the release spring 131 is configured as a coil spring between the intermediate member 130 and the movable side lifter cam 84 with a simple and compact configuration. Can be provided.

  Further, the movable-side lifter cam 84 and the intermediate member 130 both have fitting hole medium diameter portions 132a and through holes 144 that are through holes penetrating in the axial direction, and inner walls of the fitting hole medium diameter portions 132a and the through holes 144. A lifter side stepped portion 132c and an intermediate member side stepped portion 145 projecting radially inward from the inner side are respectively inserted into the fitting hole middle diameter portion 132a and the through hole 144 and locked to the intermediate member side stepped portion 145. A collar member 140 having a collar-side flange portion 140b and a screw hole portion 140c is provided, and a stopper member 146 that is locked to the lifter-side step portion 132c is a stopper member fixing bolt that is fastened to the screw hole portion 140c. It is fixed by 147. For this reason, the movable-side lifter cam 84 and the intermediate member 130 can be assembled with a simple structure by the collar member 140 inserted into the fitting hole middle diameter portion 132a and the through-hole 144, and the movable-side lifter cam 84 and the intermediate member 130 can be assembled. And the small assembly 148 provided with the release spring 131 can be formed with a simple structure.

  Furthermore, since the release spring initial load Rp is applied to the release spring 131 before the movable side lifter cam 84 is rotated, and the release spring initial load Rp is received by the stopper member 146, the movable side lifter cam 84 is applied. The release spring initial load Rp is released at the moment when the is rotated and moved, and the release spring initial load Rp acts in the clutch disengagement direction. For this reason, the clutch capacity can be reduced at a stretch by the amount corresponding to the release spring initial load Rp, and the clutch capacity can be easily matched with the first intermediate capacity C2.

  Further, the movable-side lifter cam 84 and the intermediate member 130 are in-row fitted so that the movable-side lifter cam 84 is positioned on the radially outer side of the intermediate member 130, and the bottom of the inner peripheral surface of the in-row fitting portion of the movable-side lifter cam 84. 149 is provided so as to come into contact with the front end surface 141a of the in-row fitting portion of the intermediate member 130 after the movable lifter cam 84 has been lifted by a predetermined amount. For this reason, when the movable lifter cam 84 is lifted by a predetermined amount and the inner peripheral surface bottom portion 149 comes into contact with the front end surface 141a of the intermediate member 130, the movable lifter cam 84 and the intermediate member 130 move integrally without relative movement. It becomes like this. As a result, after the movable lifter cam 84 has been lifted by a predetermined amount, the lifter plate 96 can be lifted directly by the movable lifter cam 84, and the clutch capacity can be reduced at once.

  Further, the lifter plate 96 is urged in the clutch engagement direction by the pressing force of the subspring 97 to which the subspring load S2 larger than the release spring initial load Rp is applied, and the movable side lifter cam 84 is operated by a predetermined amount. Then, the release spring initial load Rp of the release spring 131 is released, the intermediate member 130 presses the lifter plate 96 in the clutch disengagement direction, and the lifter is compressed by the release spring 131 that is compressed as the operation amount of the movable lifter cam 84 increases. When the plate 96 is further pressed in the clutch disengagement direction and the operation amount of the movable lifter cam 84 is further increased, the movable lifter cam 84 comes into direct contact with the intermediate member 130, and the lifter plate 96 is moved in the clutch disengagement direction via the intermediate member 130. Press. For this reason, when the movable lifter cam 84 is operated by a predetermined amount, the clutch capacity can be decreased by the release spring initial load Rp, and when the operation amount of the movable lifter cam 84 is increased, the release spring 131 is moved. The clutch capacity can be gradually reduced by the amount of compression, and when the movable lifter cam 84 directly contacts the intermediate member 130, the lifter plate 96 is directly lifted by the movable lifter cam 84 to further reduce the clutch capacity. Can do.

In addition, the said 1st Embodiment shows the one aspect | mode which applied this invention, Comprising: This invention is not limited to the said embodiment.
In the first embodiment, the collar side flange portion 140b is locked to the intermediate member side step portion 145, and the stopper member 146 is locked to the lifter side step portion 132c. It is not limited to. For example, the collar member 140 may be disposed in the reverse direction, the collar side flange portion 140b may be locked to the lifter side step portion 132c, and the stopper member 146 may be locked to the intermediate member side step portion 145.

[Second Embodiment]
Hereinafter, a second embodiment to which the present invention is applied will be described with reference to FIGS. In the second embodiment, parts that are configured in the same manner as in the first embodiment are given the same reference numerals, and descriptions thereof are omitted.
The second embodiment is different from the first embodiment in that the shift clutch mechanism 51 is operated by a clutch operation mechanism 252 having a configuration different from that of the clutch operation mechanism 52.

FIG. 13 is a cross-sectional view of the clutch operation mechanism 252 in the second embodiment.
As shown in FIG. 13, the clutch operation mechanism 252 is anchored to the clutch cover 30 d in a position substantially coaxial with the main shaft 56, and supported by the anchor member 201 and coupled to the clutch lever 81. And an operation member 235. The clutch operating mechanism 252 includes a release spring 231 that biases the anchor member 201 toward the lifter plate 96.
The clutch operating mechanism 252 and the shift clutch mechanism 51 constitute a clutch device 248.
The operation member 235 is sandwiched between the fixed-side lifter cam 283 fixed to the anchor member 201, the movable-side lifter cam 284 provided to face the fixed-side lifter cam 283, and the movable-side lifter cam 284 and the fixed-side lifter cam 283. And a plurality of balls 85.

An anchor support hole 202 (hole) into which the anchor member 201 is fitted is formed in the plate-like portion of the clutch cover 30d. A groove 202 a extending in the axial direction is formed in a part of the inner periphery of the anchor support hole 202.
The anchor member 201 includes a cylindrical anchor main body portion 203 and an anchor shaft portion 204 that is inserted through the anchor main body portion 203.
The anchor shaft portion 204 has a lifter fixing portion 204a to which the fixed-side lifter cam 283 is fixed at one end, and an outer fixing portion 204b that penetrates the anchor main body portion 203 and protrudes outside the clutch cover 30d at the other end. The anchor shaft portion 204 has a flange portion 204c protruding in the radial direction at a position adjacent to the lifter fixing portion 204a.

The anchor main body 203 is provided with a hole 203a penetrating in the axial direction as a center. The anchor shaft portion 204 is inserted into the hole 203a until the flange portion 204c contacts one end of the anchor main body portion 203, and a nut 205 is fastened to the outer fixing portion 204b protruding outward from the other end of the anchor main body portion 203. As a result, it is integrated with the anchor main body 203.
The anchor main body portion 203 has an anchor side flange portion 206 that protrudes in a hook shape radially outward in an intermediate portion in the axial direction. The anchor main body 203 has a bulging portion 207 that bulges outward integrally with the anchor-side flange portion 206 at a part of the end portion on the fixed-side lifter cam 283 side. A positioning hole 207a is formed on the side lifter cam 283 side.

On the other end side of the anchor main body 203, a shaft-shaped through collar portion 208 that is inserted through the anchor support hole portion 202 is provided. A guide protrusion 208 a extending in the axial direction from the anchor side flange portion 206 is formed on a part of the outer peripheral surface of the through collar portion 208.
The penetrating collar 208 has an outer protrusion 208b that passes through the anchor support hole 202 and protrudes outside the clutch cover 30d. An annular groove 208c extending in the circumferential direction is formed on the outer peripheral surface of the outer protrusion 208b, and a ring-shaped retaining ring member 209 is fitted into and fixed to the groove 208c. The retaining ring member 209 has a larger diameter than the anchor support hole 202.

The anchor member 201 is disposed so as to penetrate the clutch cover 30d from the inside and protrude outward, and includes an anchor side flange portion 206 inside the clutch cover 30d, and a retaining ring member outside the clutch cover 30d. 209.
The anchor member 201 is fitted to the anchor support hole 202 so as to be movable in the axial direction, and the position in the axial direction is regulated by the anchor side flange portion 206 and the retaining ring member 209.

The interval between the anchor side flange portion 206 and the clutch cover 30d is formed to be larger than the plate thickness around the anchor support hole portion 202 in the clutch cover 30d. Therefore, a gap is formed between the anchor side flange portion 206 and the cover inner wall surface 210a of the clutch cover 30d, and the anchor member 201 can move in the axial direction within the range of the gap.
The anchor member 201 is restricted from rotating by the guide protrusion 208 a fitting into the groove 202 a of the anchor support hole 202.
A cap member 212 that covers and seals the outer protrusion 208b, the retaining ring member 209, and the like is attached to the cover outer wall surface 210b of the clutch cover 30d via a bolt 212a.

  The release spring 231 is sandwiched between the anchor side flange portion 206 and the cover inner wall surface 210a. The release spring 231 is disposed in a compressed state and biases the anchor member 201 toward the operation member 235. That is, a preload having a predetermined size is attached to the release spring 131. In FIG. 13, the load transmission path of the release spring 231 is schematically shown by arrows. The preload acts to axially separate the anchor member 201 from the cover inner wall surface 210a. However, in the state shown in FIG. 13, the preload is received by a retaining ring member 209 that is in contact with the cover outer wall surface 210b. It has been.

The release spring 231 is a disc spring having a larger diameter than the anchor side flange portion 206, and an outer peripheral portion is supported by the cover inner wall surface 210 a and an inner peripheral portion is supported by the anchor side flange portion 206.
The anchor side flange portion 206 is provided with a clearance adjustment portion 211 that protrudes toward the cover inner wall surface 210a at a position closer to the inner periphery than the inner periphery of the release spring 231.
The clearance adjustment unit 211 contacts the inner peripheral part of the release spring 231 to position the release spring 231.

  The fixed-side lifter cam 283 includes a guide tube portion 283a that is fitted and coupled to the outer periphery of the lifter fixing portion 204a of the anchor member 201, and a hook-like shape that protrudes radially outward from the end of the guide tube portion 283a on the anchor member 201 side. Receiving plate portion 283b. Further, the fixed-side lifter cam 283 has a rod-like position restricting portion 283c that protrudes from the receiving plate portion 283b toward the anchor member 201 and fits into the positioning hole 207a. The fixed-side lifter cam 283 is provided so as not to rotate because the position restricting portion 283c is fitted into the positioning hole 207a.

The movable-side lifter cam 284 includes a cylindrical portion 284a that fits on the outer peripheral surface of the guide cylindrical portion 283a of the fixed-side lifter cam 283, and a bowl-shaped receiver that protrudes radially outward from the end portion of the cylindrical portion 284a on the fixed-side lifter cam 283 side. And a plate portion 284b. The movable-side lifter cam 284 has a rod-like connecting portion 284c that protrudes from a part of the receiving plate portion 284b and extends toward the shift spindle 71, and a bearing fixing portion 284d to which the inner ring of the ball bearing 87 is fitted and fixed. . The movable lifter cam 284 is provided so as to be movable and rotatable in the axial direction with respect to the guide tube portion 283a fixed so as not to rotate.
The movable side lifter cam 284 is connected to the lifter plate 96 via a ball bearing 87.
The movable lifter cam 284 is connected to the lever portion 81b of the clutch lever 81 (FIG. 3) via a pin (not shown) provided in the connecting portion 284c.

A plurality of ball support grooves 283d and 284e in which the balls 85 are disposed are provided in the circumferential direction on the surfaces of the receiving plate portion 283b and the receiving plate portion 284b facing each other. The ball support groove 284e has an inclined cam portion 284f whose height changes in the circumferential direction.
When the clutch lever 81 is rotated, the movable-side lifter cam 284 is rotated about the guide cylinder portion 283a of the fixed-side lifter cam 283 via the clutch lever 81, and the cam portion 284f slides with respect to the ball 85. , Move in the axial direction.

FIG. 14 is an example of a chart showing the clutch capacity of the shift clutch mechanism 51.
As shown in FIG. 14, in the second embodiment, the clutch capacity of the shift clutch mechanism 51 is variable in a plurality of stages. Specifically, the clutch capacity includes a maximum capacity U1 whose clutch capacity is determined by the urging force of the main spring 95 and the sub spring 97, a first intermediate capacity U2 in which a part of the urging force of the sub spring 97 is reduced, and the sub spring. 97 has a second intermediate capacity U3 determined by the urging force of the main spring 95 with all of the urging force 97 reduced, and a cutting capacity U4 from which all of the urging force of the main spring 95 has been removed.

  The maximum capacity U1 is obtained in the clutch engaged state shown in FIG. In the clutch connected state, the lifter plate 96 is in contact with the stopper plate 105, and the urging force of the sub spring 97 is transmitted to the pressure plate 93 via the lifter plate 96 and the stopper plate 105. Therefore, the biasing force with which the pressure plate 93 presses the clutch plate 94 includes a main spring load S1 (FIG. 14) that is a preload of the main spring 95 and a subspring load S2 (FIG. 14) that is a preload of the subspring 97. Will be the maximum, and will be the maximum.

In the state of the maximum capacity U1, as shown in FIG. 13, in the clutch operating mechanism 252, the preload of the release spring 231 is received by a retaining ring member 209 that is in contact with the inner wall surface 210a of the cover. In the state of the maximum capacity U1, an initial gap V is formed between the clearance adjustment portion 211 of the anchor member 201 and the cover inner wall surface 210a.
That is, in the state of the maximum capacity U1, the preload of the release spring 231 does not affect the clutch capacity. Here, the preload of the release spring 231 is shown in FIG. 14 as the release spring initial load Wp.

FIG. 15 is a cross-sectional view showing the clutch operation mechanism 252 in the initial state of the first intermediate capacity U2. Here, in FIG. 15, the load transmission path of the release spring 231 is schematically shown by arrows. FIG. 4 shows the state of the shift clutch mechanism 51 corresponding to the initial state of the first intermediate capacity U2.
When the movable lifter cam 284 rotates to a predetermined amount M1 with the rotation of the shift spindle 71 by the actuator mechanism 54 (FIG. 3), the ball 85 rides on the movable lifter cam 284 and the fixed lifter cam 283 is pushed by the ball 85. Then, it slides a predetermined amount toward the cover inner wall surface 210a. As a result, the anchor member 201 is moved to the cover inner wall surface 210a side together with the fixed-side lifter cam 283, and the retaining ring member 209 is separated from the cover inner wall surface 210a by the gap X. At the moment when the gap X is formed, the release spring initial load Wp received by the retaining ring member 209 is released, and the release spring initial load Wp includes the anchor member 201 and the operation member 235, as indicated by arrows in FIG. And is transmitted to the lifter plate 96 via the ball bearing 87.
The release spring initial load Wp is a load acting in the opposite direction to the sub-spring 97, and acts in the clutch disengagement direction.
Here, the gap X only needs to be larger than zero.

Since the sub-spring load S2 is set to be larger than the release spring initial load Wp, even if the release spring initial load Wp is released, the lifter plate 96 is not displaced in the axial direction as shown in FIG. The contact with the stopper plate 105 remains.
Even if the release spring initial load Wp is released, the lifter plate 96 is not displaced, but as shown in FIG. 14, the sub spring load S2 is reduced by the amount of the release spring initial load Wp. For this reason, at the moment when the gap X is formed, the clutch capacity decreases at a stretch and changes from the maximum capacity U1 to the first intermediate capacity U2.

As the actuator mechanism 54 is driven, the fixed-side lifter cam 283 continues to move toward the cover inner wall surface 210a. When the amount of rotation of the movable-side lifter cam 284 reaches a predetermined amount M2, the initial gap V becomes zero and the clearance The adjustment part 211 contacts the inner wall surface 210a of the cover.
The first intermediate capacity U2 is obtained in a section where the rotation amount of the movable lifter cam 284 changes from the predetermined amount M1 to the predetermined amount M2.

More specifically, the release spring 231 is gradually compressed as the fixed-side lifter cam 283 moves in the axial direction, and the release spring load W (FIG. 14) of the release spring 231 increases in a curve. For this reason, between the predetermined amount M1 and the predetermined amount M2, the sub spring load S2 is gradually reduced by an increase of the release spring load W, and the first intermediate capacity U2 also increases the rotation amount of the movable side lifter cam 284. Along with this, the characteristic gradually decreases. Here, since the release spring 231 is a disc spring, the release spring load W increases in a curve rather than linearly with respect to the compression amount.
In the second embodiment, since a section of play by the initial gap V is provided, the section in which the first intermediate capacity U2 can be obtained can be lengthened, and the clutch capacity can be increased without making parts or a control method highly accurate. Can be variable.
The release spring load W is set so as not to exceed the sub spring load S2 even when the release spring load W reaches the predetermined amount M2. For this reason, even in the state of the predetermined amount M2, the lifter plate 96 is not displaced in the axial direction but remains in contact with the stopper plate 105.

FIG. 16 is a cross-sectional view showing the clutch operation mechanism 252 in the state of the second intermediate capacity U3. FIG. 10 is a cross-sectional view showing the state of the shift clutch mechanism 51 corresponding to the state of the second intermediate capacity U3.
When the rotation amount of the movable side lifter cam 284 reaches the predetermined amount M2, the clearance adjustment unit 211 is in contact with the cover inner wall surface 210a, and therefore the fixed side lifter cam 283 cannot move toward the cover inner wall surface 210a. . For this reason, when the amount of rotation of the movable side lifter cam 284 further increases from the predetermined amount M2, the movable side lifter cam 284 receives a reaction force from the fixed side lifter cam 283. The movable lifter cam 284 that has received the reaction force directly presses the lifter plate 96 via the ball bearing 87, and moves the lifter plate 96 in the clutch disengagement direction.
Specifically, the movable-side lifter cam 284 starts to directly push the lifter plate 96 only by the amount of rotation of the movable-side lifter cam 284 being slightly larger than the predetermined amount M2. By this direct pushing, as shown in FIG. 10, the lifter plate 96 is lifted to the stepped portion 99 c side along the guide shaft portion 99 b against the urging force of the sub spring 97, and is separated from the stopper plate 105.

  When the lifter plate 96 is separated from the stopper plate 105, the sub spring load transmission path K is cut off, the sub spring load S2 is not transmitted to the pressure plate 93, and the clutch capacity is determined only by the main spring load S1. It becomes like this. Therefore, as shown in FIG. 14, at the moment when the lifter plate 96 is separated from the stopper plate 105, the clutch capacity decreases from the first intermediate capacity U2 to the second intermediate capacity U3. The first predetermined lift amount L1 of the lifter plate 96 that blocks the sub-spring load transmission path K may be larger than zero.

  When the movement of the movable side lifter cam 284 is continued after the lifter plate 96 is separated from the stopper plate 105, the direct pushing by the movable side lifter cam 284 is also continued, and the lifter plate 96 further moves to the step 99c side. continue. A section from when the lifter plate 96 is separated from the stopper plate 105 to contact with the stepped portion 99c is a section of the second intermediate capacity U3. In this section, the lifter plate 96 only moves relative to the stepped portion 99c and does not affect the main spring load S1. For this reason, as shown in FIG. 14, in the section of the second intermediate capacity U3, the clutch capacity is determined only by the main spring 95, and the second intermediate capacity U3 is constant. In the second embodiment, since the play by the gap G is provided, the section in which the second intermediate capacity U3 can be obtained can be lengthened, and the clutch capacity can be set to a predetermined intermediate level without making the parts and the control method highly accurate. The capacity can be changed.

FIG. 11 is a cross-sectional view showing the shift clutch mechanism 51 in the state of the cutting capacity U4.
When the lifter plate 96 is moved by the second predetermined lift amount L2 by the movable-side lifter cam 284 and the lifter plate 96 comes into contact with the step 99c, the pressure plate 93 is pressed by the lifter plate 96 and attached to the main spring 95. Moves in the clutch disengagement direction against the force. More specifically, when the pressure plate 93 is slightly pressed in the clutch disengagement direction, the clutch plate 94 held between the pressure plate 93 and the clutch center 92 is released, and the clutch capacity becomes zero.

  As described above, according to the second embodiment to which the present invention is applied, the clutch device 248 biases the plurality of clutch plates 94 in the clutch engagement direction by the pressing force of the main spring 95 and the sub spring 97. A speed change clutch mechanism 51 having a pressure plate 93 and a lifter plate 96 that lifts the pressure plate 93 in the clutch disengagement direction, a fixed-side lifter cam 283 that fixes relative displacement in the circumferential direction on the clutch cover 30d side, and a ball 85 And a movable-side lifter cam 284 that lifts the lifter plate 96 by cooperating with the fixed-side lifter cam 283, and relative displacement is fixed in the circumferential direction relative to the clutch cover 30d, and relative displacement in the axial direction. Anchor member 201 that can be attached to the fixed-side lifter cam 2 3 and the clutch cover 30d, and a release spring 231 that urges the fixed-side lifter cam 283 in the clutch disengagement direction according to the rotation of the movable-side lifter cam 284 is provided between the anchor member 201 and the clutch cover 30d. Be placed. As described above, the release spring 231 is provided not between the shift clutch mechanism 51 side but between the anchor member 201 provided between the fixed-side lifter cam 283 and the clutch cover 30d and the clutch cover 30d. The release spring 231 capable of setting the first intermediate capacity U2 of the clutch can be arranged while preventing the shift clutch mechanism 51 from being enlarged.

  An anchor support hole 202 through which the anchor member 201 is inserted is provided in the clutch cover 30d. The anchor member 201 is provided with a through collar portion 208 that penetrates the anchor support hole 202, and the clutch of the through collar portion 208 is provided. An anchor-side flange portion 206 extending in the radial direction is provided at a location closer to the speed change clutch mechanism 51 than the cover 30d, and a release spring is provided on the outer protruding portion 208b which is a portion protruding outward from the clutch cover 30d of the through collar portion 208. A retaining ring member 209 that receives an axial load of 231 is provided. Therefore, with a simple and compact configuration, the anchor member 201 can be provided around the clutch cover 30d so as to be capable of relative displacement in the axial direction and to receive the axial load of the release spring 231.

Further, since the release spring initial load Wp is applied to the release spring 231 before the movable side lifter cam 284 rotates, and the release spring initial load Wp is received by the retaining ring member 209, the movable side lifter cam The release spring initial load Wp is released at the instant when the anchor member 201 is moved by rotating 284, and the load corresponding to the release spring initial load Wp acts in the clutch disengagement direction. For this reason, the clutch capacity can be reduced at a stretch by an amount corresponding to the release spring initial load Wp, and the clutch capacity can be easily matched with the first intermediate capacity U2.
Furthermore, since the release spring 231 is provided as a disc spring, the release spring 231 can be provided in a compact manner.

Further, a clearance adjusting portion 211 that protrudes toward the clutch cover 30d is provided at a position radially inward of the anchor spring 201 of the anchor side flange portion 206 of the anchor member 201, and the fixed side lifter cam 283 is located on the clutch cover 30d side. When the fixed amount is moved, the clearance adjustment unit 211 comes into contact with the clutch cover 30d. For this reason, the deformation amount of the release spring 231 due to the rotation of the movable lifter cam 284 can be regulated by the clearance adjusting unit 211, and after the contact of the clearance adjusting unit 211, a load is transmitted via the clearance adjusting unit 211 to lift the lifter. The plate 96 can be lifted directly to reduce the clutch capacity.
In addition, since the cap member 212 is provided so as to cover the outer protruding portion 208b, which is the protruding portion of the penetrating collar portion 208 to the outside of the clutch cover 30d, oil leakage from around the penetrating collar portion 208 can be prevented.

30d Clutch cover 48, 248 Clutch device 51 Shift clutch mechanism (multi-plate clutch)
83,283 Fixed side lifter cam 84,284 Movable side lifter cam 85 Ball (ball member)
93 Pressure plate 94 Clutch plate 95 Main spring (spring)
96 Lifter plate 97 Sub spring (spring)
130 Intermediate member 131, 231 Release spring 132b Fitting hole large diameter part (in-row fitting part of movable side lifter cam)
132c Lifter side step (the other of the step)
132d Small diameter part of through hole (through hole)
133c Cam side flange portion 135 Operation member 140 Color member 140b Color side flange portion (flange portion)
141 Intermediate member side fitting part (in-row fitting part of intermediate member)
141a Tip surface (end)
143 Intermediate member side flange portion 144 Through hole 145 Intermediate member side step portion (one of the step portions)
146 Stopper member 147 Stopper member fixing bolt (bolt)
149 Inner peripheral surface bottom 201 Anchor member 202 Anchor support hole (hole)
208 Penetrating collar 206 Anchor flange (flange)
209 Retaining ring member 211 Clearance adjusting portion 212 Cap member

Claims (12)

A pressure plate (93) for urging the plurality of clutch plates (94) in the clutch engagement direction by the pressing force of the springs (95, 97), and a lifter plate (96) for lifting the pressure plate (93) in the clutch disengagement direction In the clutch device having a multi-plate clutch (51) having a) and an operation member (135) for lifting the lifter plate (96),
Between the operating member (135) and the lifter plate (96), an intermediate member (130) that can be displaced relative to the operating member (135) is disposed,
A release spring (131) for urging the lifter plate (96) in the clutch disengagement direction according to the operation amount of the operation member (135) is provided between the operation member (135) and the intermediate member (130). A clutch device that is arranged. The operating member (135) cooperates with the fixed-side lifter cam (83) via the fixed-side lifter cam (83) fixed to the clutch cover (30d) in the circumferential direction and the ball member (85). A movable-side lifter cam (84) for lifting the lifter plate (96), and the movable-side lifter cam (84) and the intermediate member (130) are in-row fitted,
The release spring (131) is between a cam side flange portion (133c) provided on the movable side lifter cam (84) side and an intermediate member side flange portion (143) provided on the intermediate member (130) side. The clutch device according to claim 1, wherein the clutch device is provided as a coil spring. The movable-side lifter cam (84) and the intermediate member (130) both have a through hole (132d, 144) penetrating in the axial direction and a step protruding radially inward from the inner wall of the through hole (132d, 144). Parts (132c, 145), respectively,
One of the stepped portions (145) of the movable side lifter cam (84) and the intermediate member (130) inserted through the through holes (132d, 144) of the movable side lifter cam (84) and the intermediate member (130). A collar member (140) having a flange portion (140b) to be locked to the inner thread and having a female screw cut,
A stopper member (146) locked to the other side (132c) of the stepped portion of the movable side lifter cam (84) and the intermediate member (130) is a bolt (fastened to the female screw of the collar member (140)). The clutch device according to claim 2, wherein the clutch device is fixed by 147).   The release spring (131) is preloaded before the movable lifter cam (84) is rotated, and the preload is received by the stopper member (146). Item 4. The clutch device according to Item 3. The movable-side lifter cam (84) and the intermediate member (130) are in-row fitted so that the movable-side lifter cam (84) is positioned radially outward from the intermediate member (130).
An inner peripheral surface bottom portion (149) of the in-row fitting portion of the movable side lifter cam (84) is an end portion of the in-row fitting portion of the intermediate member (130) after the movable side lifter cam (84) is lifted by a predetermined amount. The clutch device according to claim 3, wherein the clutch device is provided so as to abut against (141a). The lifter plate (96) is biased in the clutch connection direction by the pressing force of the spring (97) to which a preload larger than the preload of the release spring (131) is applied, and the operation member (135) is When operated by a predetermined amount, the preload of the release spring (131) is released, and the intermediate member (130) presses the lifter plate (96) in the clutch disengagement direction,
The lifter plate (96) is further pressed in the clutch disengagement direction by the release spring (131) that is compressed as the operation amount of the operation member (135) increases.
When the operation amount of the operation member (135) further increases, the operation member (135) directly contacts the intermediate member (130), and the lifter plate (96) is disengaged through the intermediate member (130). The clutch device according to claim 1, wherein the clutch device is pressed in a direction. A pressure plate (93) for urging the plurality of clutch plates (94) in the clutch engagement direction by the pressing force of the springs (95, 97), and a lifter plate (96) for lifting the pressure plate (93) in the clutch disengagement direction ), A fixed-side lifter cam (283) whose relative displacement in the circumferential direction is fixed to the clutch cover (30d) side, and the fixed-side lifter cam (283) via a ball member (85). A clutch device including a movable lifter cam (284) for lifting the lifter plate (96) by cooperating with
An anchor member (201) capable of fixing relative displacement in the circumferential direction with respect to the clutch cover (30d) and capable of relative displacement in the axial direction includes the fixed-side lifter cam (283) and the clutch cover (30d). Between
A release spring (231) that urges the fixed-side lifter cam (283) in the clutch disengagement direction according to the rotation of the movable-side lifter cam (284) is formed between the anchor member (201) and the clutch cover (30d). A clutch device arranged between the clutch devices. The clutch cover (30d) is provided with a hole (202) through which the anchor member (201) is inserted, and the anchor member (201) has a penetrating collar portion (208) penetrating the hole (202). Is provided,
A flange portion (206) extending in the radial direction is provided at a location closer to the clutch than the clutch cover (30d) of the penetrating collar portion (208),
A retaining ring member (209) for receiving an axial load of the release spring (231) is provided at a portion of the penetrating collar portion (208) protruding outward from the clutch cover (30d). Item 8. The clutch device according to Item 7.   The release spring (231) is preloaded before the movable lifter cam (284) is rotated, and the preload is received by the retaining ring member (209). The clutch device according to claim 8.   The clutch device according to claim 8, wherein the release spring (231) is provided as a disc spring.   A clearance adjusting portion (211) protruding toward the clutch cover (30d) is provided at a position radially inward of the flange portion (206) of the anchor member (201) with respect to the disc spring (231). The clutch device according to claim 10, wherein when the fixed lifter cam (283) moves to the clutch cover (30d) side by a predetermined amount, the clearance adjusting portion (211) abuts on the clutch cover (30d).   The clutch device according to claim 8, wherein a cap member (212) is provided so as to cover an outward projecting portion of the clutch cover (30d) of the penetrating collar portion (208).

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