JP2013210088A - Vehicle transmission apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle transmission apparatus that can make the size of a transmission in a radial direction compact at the periphery of a master arm in a shift spindle, in the transmission apparatus in which the master arm for operating the transmission via a power accumulation mechanism is arranged at one shift spindle.SOLUTION: A vehicle transmission apparatus 50 comprises: a clutch lever 72 for operating a clutch; a master arm 83 which transmits a rotational force of a shift spindle 55 to a shift drum of a transmission, and operates the shift drum by turning it; and a power accumulation spring 57 for energizing the master arm 83 in an oscillation direction while power-accumulating the rotational force of the shift spindle 55 between the shift spindle 55 and the master arm 83. In the power accumulation spring 57, its one end 57a is locked to a locking part 81a at the side of a gear shift arm located at the side of the master arm 83, and the other side 57b is locked to a locking part 71a at the side of a power accumulation collar located at the side of the clutch lever 72.

Description

  The present invention relates to a clutch-linked transmission for a vehicle.

  In Patent Document 1, as a clutch-coupled transmission for a vehicle, a master arm that operates a transmission via a power accumulation mechanism is brought into contact with one (single) shift spindle, a master arm, and a shift spindle. And a sub-arm that is rotatably supported by the robot. A hook is provided at the center of the arm portion (long arm portion) of the master arm. Both side surfaces of the hook and the side surfaces of the bent end of the sub arm are elastically sandwiched between both ends of the preload spring.

JP 2001-280493 A

  The master arm and the preload spring are arranged on the radially outer side of the clutch. Therefore, in order to prevent interference between the hook of the master arm, the bent end of the sub arm and the preload spring, and the clutch, the size of the transmission in the radial direction increases around the master arm in the shift spindle.

  The present invention relates to a transmission apparatus for a vehicle in which a master arm for operating a transmission via a power storage mechanism is provided on one shift spindle, and the radial size of the transmission around the master arm of the shift spindle. It is an object of the present invention to provide a vehicle transmission that can keep the vehicle compact.

  According to a first aspect of the present invention, there is provided a shift spindle, a clutch lever that is provided on the shift spindle and operates a clutch, and is swingably supported by the shift spindle. A master arm that is transmitted to the drum to rotate and operate the shift drum, and between the shift spindle and the master arm, the master spindle is moved in a swinging direction while accumulating the rotational force of the shift spindle. The clutch lever and the master arm are arranged to face each other across the clutch in the axial direction of the shift spindle, and the energy storing spring. Is coiled, and its one end is locked when it is locked to the locking portion located on the master arm side. Characterized in that the other end thereof is engaged with the engaging portion located on the side of the clutch lever.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect, the locking portion positioned on the master arm side and the locking portion positioned on the clutch lever side are provided on the shift spindle. It is formed from the boss | hub extended in parallel with an axial direction.

  According to a third aspect of the present invention, in addition to the configuration of the first aspect, as a locking portion that contacts the master arm, is rotatably supported by the shift spindle, and is positioned on the master arm side. A gear shift arm having a gear shift arm side locking portion, and a locking portion that is disposed on the clutch lever side with respect to the gear shift arm, rotates integrally with the shift spindle, and is positioned on the clutch lever side. And a power storage collar having a power storage collar side locking portion.

  According to a fourth aspect of the present invention, in addition to the configuration of the second aspect, the locking portion positioned on the master arm side and the locking portion positioned on the clutch lever side are provided on the shift spindle. It is characterized by being arranged on the opposite side to the clutch with respect to the axial direction.

  According to a fifth aspect of the present invention, in addition to the configuration of the third aspect, a preload stopper collar that rotates integrally with the shift spindle and has a first doweled tooth is provided, and the gear shift arm includes the first shift arm. It has the 1st dowel hole linked with a dowel tooth, It is characterized by the above-mentioned.

  According to a sixth aspect of the present invention, in addition to the configuration according to the second aspect, the accumulator spring develops an urging force in a direction to rotate the shift drum toward the shift-up side, and the clutch includes a sleeper. It is a clutch.

  According to a seventh aspect of the present invention, in addition to the configuration according to the third aspect, the clutch lever is rotatably supported by the shift spindle and has a second dowel hole, and the accumulator The collar has a second dowel tooth linked to the second dowel hole.

  According to the first aspect of the present invention, the gear shift arm having a large diameter and the clutch lever are wrapped in the axial direction, and at one end (on the master arm side), which is an engaging portion of the accumulating spring that can set the diameter small. The locking portion positioned) and the other end (the locking portion positioned on the clutch lever side) can be arranged on the radially outer side of the clutch. Thereby, the size of the periphery of the power storage mechanism in the transmission can be made compact while the power storage mechanism is configured by the power storage spring.

  According to the second aspect of the present invention, the locking portion located on the master arm side and the locking portion located on the clutch lever side are formed from bosses extending parallel to the axial direction of the shift spindle. Therefore, the protrusion in the radial direction of the locking portion positioned on the master arm side and the locking portion positioned on the clutch lever side can be suppressed as much as possible.

  According to the third aspect of the present invention, the gear shift arm that contacts the master arm, is rotatably supported by the shift spindle, and has a gear shift arm side locking portion as a locking portion located on the master arm side; A power storage collar disposed on the clutch lever side with respect to the gear shift arm, rotating integrally with the shift spindle, and having a power storage collar side locking portion as a locking portion located on the clutch lever side; Prepare. Therefore, it is possible to flexibly set the engagement position and engagement structure between the energy storage spring and the master arm, and the engagement position and engagement structure between the energy storage spring and the clutch lever.

  According to the fourth aspect of the present invention, the locking portion positioned on the master arm side and the locking portion positioned on the clutch lever side are disposed on the opposite side of the clutch with respect to the axial direction of the shift spindle. Is done. For this reason, it is possible to easily avoid interference between the clutch and the locking portion positioned on the master arm side and the locking portion positioned on the clutch lever side.

  According to the fifth aspect of the present invention, the gear shift arm further includes a preload stopper collar that rotates integrally with the shift spindle and has a first dowel tooth, and the gear shift arm has a first dowel hole that is linked to the first dowel tooth. Therefore, it is easy to provide an upper limit for the power accumulation angle, and it is possible to prevent an excessive power accumulation load from being applied to the transmission and its peripheral components.

  According to the sixth aspect of the present invention, the accumulator spring develops an urging force in the direction of rotating the shift drum toward the shift-up side, and the clutch is a sleeper clutch. Therefore, even when power can be stored only in one direction, the back torque at the time of shift down can be reduced.

  According to the seventh aspect of the present invention, the clutch lever is rotatably supported by the shift spindle and has the second dowel hole. The accumulator collar has a second dowel tooth associated with the second dowel hole. For this reason, the clutch lever can be rotated by the accumulation collar.

1 is a side view of a motorcycle 1 including a transmission 50 according to the present embodiment. It is a left view of the power unit P. It is the left view of the power unit P which abbreviate | omitted and showed the left unit case etc. It is the fragmentary sectional view (IV-IV sectional view taken on the line of FIG. 2) which showed the inside of the unit case 20 of the power unit P in the cross section. It is a right view of the power unit P of the state which removed the right unit case cover. FIG. 6 is a right side view of the power unit P in which the starting clutch and the clutch are further omitted from the state shown in FIG. 5. FIG. 7 is a sectional view of the speed change mechanism of the power unit P (sectional view taken along the line VII-VII in FIGS. 5 and 6). It is the elements on larger scale which show the periphery of the clutch lifter plate 77 in FIG. 3 is a cross-sectional view of the main configuration of the transmission device 50 cut along the axial direction of a shift spindle 55. FIG. FIG. 10 is a partially enlarged perspective view of the master arm 83 and the like viewed from the shift return spring 85 side in FIG. 9. FIG. 10 is a partially enlarged perspective view of FIG. 9 with the clutch lever 72 removed and the gear shift arm 81 and the like viewed from the accumulation collar 71 side. FIG. 10 is a partially enlarged perspective view of the master arm 83 and the like viewed from the gear shift arm 81 side with the preload stopper collar 56 and the like removed from FIG. 9. FIG. 4 is a diagram showing a part of a shift spindle 55. It is a figure which shows the master arm 83, the latching bar 87, etc., (a) is a front view, (b) is the sectional view on the AA line shown to (a). The gear shift arm 81 is a figure which shows in figure, (a) is a front view, (b) is the sectional view on the AA line shown to (a). It is a figure which shows the preload stopper collar 56, (a) is a front view, (b) is the sectional view on the AA line shown to (a). FIG. 6 is a perspective view showing an accumulation spring 57. It is a figure which shows the accumulating collar 71, (a) is a front view, (b) is the sectional view on the AA line shown to (a). 2A and 2B are diagrams illustrating a clutch lever 72 and the like, in which FIG. 1A is a front view, and FIG. 2B is a cross-sectional view taken along line AA illustrated in FIG. It is a figure which shows the clutch lever 72 grade | etc., (A) is a rear view, (b) is a figure which permeate | transmits the 2nd dowel hole 72b in Fig.19 (a). It is a figure which shows the change of the positional relationship of each structural member, etc. accompanying a speed change operation | movement, (a) is a figure which mainly shows the positional relationship of the master arm 83 side rather than the accumulator spring 57, (b) is mainly accumulator. FIG. 6 is a diagram showing a positional relationship on the clutch lever 72 side with respect to a spring 57. (A) And (b) is a figure which shows the state which the speed-change operation | movement advanced rather than FIG. (A) And (b) is a figure which shows the state which the speed-change operation | movement advanced rather than FIG. (A) And (b) is a figure which shows the state which the speed-change operation | movement advanced rather than FIG. (A) And (b) is a figure which shows the state which the speed-change operation | movement advanced rather than FIG. (A) And (b) is a figure which shows the state which the speed-change operation | movement advanced rather than FIG. It is a figure which shows relationships, such as the angle of a shift spindle, the angle of an accumulator spring, the amount of clutch lifts, and the angle of a shift drum with progress of speed change operation | movement.

Hereinafter, a motorcycle 1 including a clutch-linked transmission 50 according to an embodiment of the present invention will be described with reference to FIGS.
In the following description, descriptions of front and rear, left and right, and up and down directions are in accordance with the direction seen from the driver who rides the motorcycle unless otherwise specified. In the figure, the arrow FR indicates the front of the vehicle, the arrow LH indicates the left side of the vehicle, and the arrow UP indicates the upper side of the vehicle.

  FIG. 1 is a side view of a motorcycle 1 including a transmission 50 according to the present embodiment. FIG. 2 is a left side view of the power unit P. FIG. FIG. 3 is a left side view of the power unit P with the left unit case and the like omitted. 4 is a partial cross-sectional view (a cross-sectional view taken along the line IV-IV in FIG. 2) showing the inside of the unit case 20 of the power unit P in a cross-section. FIG. 5 is a right side view of the power unit P with the right unit case cover removed. FIG. 6 is a right side view of the power unit P in which the starting clutch and the clutch are further omitted from the state shown in FIG. FIG. 7 is a cross-sectional view of the speed change mechanism of the power unit P (a cross-sectional view taken along the line VII-VII in FIGS. 5 and 6). FIG. 8 is a partially enlarged view showing the periphery of the clutch lifter plate 77 in FIG.

  FIG. 9 is a cross-sectional view of the main configuration of the transmission 50 cut along the axial direction of the shift spindle 55. FIG. 10 is a partially enlarged perspective view of the master return arm 85 and the like viewed from the shift return spring 85 side in FIG. FIG. 11 is a partially enlarged perspective view of the gear shift arm 81 and the like viewed from the side of the accumulation collar 71 with the clutch lever 72 removed from FIG. 12 is a partially enlarged perspective view of the master arm 83 viewed from the gear shift arm 81 side with the preload stopper collar 56 and the like removed from FIG. FIG. 13 is a view showing a part of the shift spindle 55. 14A and 14B are views showing the master arm 83, the locking bar 87, and the like. FIG. 14A is a front view, and FIG.

  FIGS. 15A and 15B are diagrams showing the gear shift arm 81, in which FIG. 15A is a front view and FIG. 15B is a cross-sectional view taken along line AA shown in FIG. 16A and 16B are views showing the preload stopper collar 56, where FIG. 16A is a front view and FIG. 16B is a cross-sectional view taken along line AA shown in FIG. FIG. 17 is a perspective view showing the energy storage spring 57. 18A and 18B are diagrams showing the accumulating collar 71, where FIG. 18A is a front view, and FIG. 18B is a cross-sectional view taken along line AA shown in FIG. 19A and 19B are views showing the clutch lever 72 and the like, in which FIG. 19A is a front view, and FIG. 19B is a cross-sectional view taken along line AA shown in FIG. 20A and 20B are views showing the clutch lever 72 and the like. FIG. 20A is a rear view, and FIG. 20B is a view showing the second dowel hole 72b in FIG. 19A.

  As shown in FIG. 1, a body frame 2 of a motorcycle 1 includes a head pipe 3, a main pipe 4, a center frame 5, a pair of left and right rear pipes 6, 6, and a pair of left and right back stays 7, 7. Prepare. The head pipe 3 is located on the vehicle body front side (FR side). The main pipe 4 extends obliquely rearward and downward from the head pipe 3. The center frame 5 extends from the rear of the main pipe 4 to the left and right and extends downward. The pair of left and right rear pipes 6 and 6 extend obliquely rearward and upward from the front of the center frame 5 in the main pipe 4, bend substantially horizontally in the middle, and extend rearward. The pair of left and right backstays 7 and 7 are interposed between the left and right side portions of the center frame 5 that spreads left and right and the rear portions of the rear pipes 6 and 6.

A steering shaft 8 is rotatably supported on the head pipe 3. A front fork 9 having a suspension is extended below the steering shaft 8. A front wheel Fw is pivotally supported at the lower end of the front fork 9. A handle bar 8 b that is developed to the left and right is attached to the upper portion of the steering shaft 8.
The rear fork 11 is pivotally supported by the center frame 5 via a pivot shaft 10 at the front end thereof. The rear fork 11 extends rearward. A rear wheel Rw is pivotally supported at the rear end of the rear fork 11 that swings up and down. A rear cushion 12 is interposed between the rear portion of the rear fork 11 and the rear pipe 6.

Below the main pipe 4, the power unit P is supported and suspended by the main pipe 4 and the center frame 5. The power unit P includes a unit case 20, and an internal combustion engine 21 and a transmission 50 that are integrally formed with the unit case 20.
The output sprocket 13 is fitted to the output shaft of the power unit P (the counter shaft 52 of the transmission (50) as will be described later). The output sprocket 13 is located immediately in front of the pivot shaft 10. A chain 15 is suspended between the output sprocket 13 and the driven sprocket 14 on the rear wheel Rw side.

  A fuel tank 16 is installed on the inclined portions of the rear pipes 6 and 6. The seat 17 covers the fuel tank 16 and the rear horizontal portion of the rear pipes 6 and 6. The vehicle body cover 18 covers almost the entire vehicle body frame 2. A base end portion of the main stand 19 is pivotally supported at the lower end portion of the center frame 5.

  The power unit P is mainly configured with the internal combustion engine 21 disposed on the front side of the unit case 20 and the transmission 50 disposed on the rear side. The internal combustion engine 21 is an air-cooled single-cylinder four-stroke internal combustion engine, and the transmission 50 is a four-speed transmission gear meshing mechanism.

  As shown in FIGS. 2 and 3, the internal combustion engine 21 includes a unit case 20 that functions as a crankcase. The crankshaft 22 is oriented in the vehicle width direction (left-right direction) and is rotatably supported by the unit case 20. A cylinder block 23 and a cylinder head 24 are integrally fastened to the front portion of the unit case 20. The cylinder block 23 and the cylinder head 24 project forwardly inclined substantially horizontally. A cylinder head cover 25 is put on the cylinder head 24.

An intake pipe 26 extends upward from the upper surface of the cylinder head 24 protruding substantially horizontally. The intake pipe 26 is connected to an air cleaner 28. The air cleaner 28 is suspended from the front portion of the main pipe 4 via the throttle body 27.
An exhaust pipe 30 extends downward from the lower surface of the cylinder head 24. The exhaust pipe 30 extending downward immediately bends horizontally and extends backward while being inclined obliquely to the right side, passes through a part of the lower surface of the unit case 20 and exits to the right side of the vehicle body, and extends straight rearward. It is connected to the muffler 31 on the right side of Rw.

  A step bar 33 is fixed to the lower surface of the unit case 20. The step bar 33 has left and right arm portions 33b and 33b formed by bending both sides of a central horizontal portion 33a oriented in the vehicle width direction upward. Further, the step bar 33 is bent outward in the vehicle width direction to form left and right horizontal step portions 33c and 33c. A central horizontal portion 33 a is fixedly attached to the lower surface of the unit case 20.

  The left and right arm portions 33b and 33b of the step bar 33 extend obliquely forward and upward along the left and right side surfaces of the power unit P from the central horizontal portion 33a. Step members 34 and 34 are attached to the left and right horizontal step portions 33c and 33c bent outward at the upper ends of the left and right arm portions 33b and 33b. The step member 34 has a long rectangular parallelepiped shape. The right side portion of the central horizontal portion 33a is bent so as to straddle the exhaust pipe 30 extending in the front-rear direction from below.

  As shown in FIG. 4, the unit case 20 is configured by dividing the left unit case 20L and the right unit case 20R into left and right. An inner space is formed by integrally connecting the left unit case 20L and the right unit case 20R. The inner space has a crank chamber 20c on the front side and a transmission chamber 20m on the rear side. In the crank chamber 20c, the crankshaft 22 is rotatably mounted on the left and right unit cases 20L and 20R via main bearings 22b and 22b. A transmission mechanism such as the transmission 50 is accommodated in the transmission chamber 20m.

  In the cylinder liner 23c integrally formed in the cylinder block 23, the piston 35 reciprocates and slides. The piston 35 and the crankshaft 22 are connected by a connecting rod 36 to constitute a crank mechanism.

A drive sprocket 40 of a valve drive system is fitted in the vicinity of the main bearing 22b on the left crankshaft portion 22L protruding leftward from the left unit case 20L. An AC generator 41 is provided at the left end of the left crankshaft 22L. A driven gear 42 of the starting mechanism is fitted between the drive sprocket 40 and the AC generator 41.
The AC generator 41 protruding from the left side of the left unit case 20L is covered from the left side by an ACG cover 43 that is a left unit case cover.

  On the other hand, a centrifugal start clutch 45 is provided on the right crankshaft portion 22R protruding rightward from the right unit case 20R. The starting clutch 45 is configured such that a clutch outer 45o is rotatably supported around a clutch inner 45i fixed integrally to the right crankshaft portion 22R. When the rotation speed of the crankshaft 22 (engine rotation speed) exceeds a predetermined rotation speed, the clutch shoe of the clutch inner 45i is pressed against the clutch outer 45o, thereby transmitting power.

Note that a one-way clutch 44 is interposed between the clutch outer 45o and the clutch inner 45i, so that the engine brake is directly applied without passing through the starting clutch 45.
A primary drive gear 46 that rotates in contact with the left side of the clutch outer 45o is rotatably supported on the right crankshaft portion 22R.

  As shown in FIG. 4, in the transmission chamber 20m, which is an inner space on the rear side of the unit case 20, the main shaft 51 extends in parallel with the crankshaft 22 at a rear position of the crankshaft 22, and the left and right unit cases 20L, 20R is rotatably mounted via bearings 51b and 51b. At a position further rearward of the main shaft 51, the counter shaft 52 extends in parallel with the main shaft 51 and is rotatably mounted on the left and right unit cases 20L and 20R via bearings 52b and 52b. The crankshaft 22, the main shaft 51, and the counter shaft 52 are arranged linearly from the front to the rear in this order.

The transmission 50 is configured such that the first to fourth gears of the gear train 51G arranged on the main shaft 51 and the gear train 52G arranged on the counter shaft 52 are always meshed with each other. ing. One of the gear train 51G and the gear train 52G rotates with the shaft, and the other of them freely rotates with respect to the shaft.
Then, the shifter gear 51gs fitted in the serration in the gear train 51G on the main shaft 51 moves in the axial direction and is connected to the adjacent gear, and the serration fit in the gear train 52G on the counter shaft 52 is engaged. A shift stage or a neutral state of any one of the first to fourth speed stages is established by a combination of the shifter gear 52gs moving in the axial direction and connecting and disconnecting with the adjacent gear.

  The main shaft 51 protrudes rightward from the right unit case 20R. A clutch 60 is provided at a protruding portion of the main shaft 51. A clutch outer 61 of the clutch 60 is pivotally supported by the main shaft 51 via a sleeve 59 so as to be relatively rotatable. A primary driven gear 47 is attached to the clutch outer 61 via a buffer member 48. The primary drive gear 46 rotates by decelerating the primary driven gear 47 that meshes with the primary drive gear 46 together with the clutch outer 61.

  A clutch inner 62 is integrally fitted to the right end of the main shaft 51. The plurality of driving friction plates 63 that are serrated and fitted to the outer periphery of the peripheral wall portion of the clutch inner 62 and the driven friction plates 64 that are serrated and fitted to the inner periphery of the peripheral wall portion of the clutch outer 61 are alternately arranged in the axial direction. ing. The pressure plate 65 is supported by the clutch inner 62 so as to be slidable in the axial direction with the driving friction plate 63 and the driven friction plate 64 sandwiched between the pressure plate 65 and the disc outer peripheral portion of the clutch inner 62. Has been.

  As shown in FIGS. 4 and 7, the pressure plate 65 that is slidable in the axial direction is positioned inside the clutch outer 61 and on the inner side in the axial direction than the clutch inner 62. In the disc portion of the clutch inner 62, a plurality of support bosses 65b protruding from the pressure plate 65 pass through a plurality of through holes that are perforated in the circumferential direction. An annular release flange 66 is fastened by a bolt 67 to the tip of the support boss 65b.

A disc spring-like clutch spring 68 is interposed between the release flange 66 and the clutch inner 62. The pressure plate 65 is biased rightward by the clutch spring 68 together with the release flange 66. The pressure plate 65 sandwiches the driving friction plate 63 and the driven friction plate 64 with the clutch inner 62. As a result, the clutch 60 is maintained in the connected state, and the rotation of the clutch outer 61 is transmitted to the clutch inner 62 and further to the main shaft 51.
When the release flange 66 is pushed to the left and the pressure plate 65 moves to the left against the clutch spring 68, the distance between the pressure plate 65 and the clutch inner 62 increases. As a result, the pinching of the driving friction plate 63 and the driven friction plate 64 is loosened, and the connected state of the clutch 60 is released.

  The clutch 60 includes a slipper clutch having a back torque limiter mechanism (also referred to as a back torque reduction mechanism). The back torque limiter mechanism is a state in which the clutch 60 is loosened from the connected state (half-clutch state) when excessive torque (back torque) is applied to the clutch 60 in the direction opposite to the forward power transmission. It is a mechanism to make. A known back torque limiter mechanism can be used. According to the back torque limiter mechanism, it is possible to reduce a shock caused by the back torque at the time of downshifting.

The rotation of the crankshaft 22 of the internal combustion engine 21 is transmitted to the main shaft 51 of the transmission 50 through the start clutch 45 and the clutch 60.
The starting clutch 45 provided at the right end of the right crankshaft 22R and the clutch 60 provided at the right end of the main shaft 51 are covered from the right by a right unit case cover 49.
Note that the output sprocket 13 fitted to the end of the counter shaft 52 penetrating the left unit case 20L to the left is covered from the left side except for the rear where the chain 15 extends by the sprocket cover 53.

As shown in FIGS. 2, 5, and 6, a shift spindle 55 is disposed obliquely below and below the crankshaft 22 and obliquely forward and below the countershaft 52 and the main shaft 51. As shown in FIG. 7, the shift spindle 55 passes through the left and right unit cases 20 </ b> L and 20 </ b> R in the left and right direction, and the right side portion passes through the bearing boss portion 49 a of the right unit case cover 49 and is rotatably supported. Yes.
The shift spindle 55 is disposed below the unit case 20, and is located below the step member 34 in a side view shown in FIG.

  The rotation of the shift spindle 55 drives both the clutch operating mechanism 70 and the speed change operating mechanism 80. The clutch operating mechanism 70 operates the clutch 60 to disconnect and connect the clutch 60. The speed change operation mechanism 80 operates the speed change device 50 to switch the gear position of the speed change device 50.

The clutch operation mechanism 70 will be described with reference to FIGS. 4 and 7.
As shown in FIGS. 4 and 7, a clutch lever 72 is swingably supported in the vicinity of the bearing boss portion 49 a of the right unit case cover 49 in the shift spindle 55. The configuration and operation in which the clutch lever 72 swings as the shift spindle 55 rotates will be described in detail later.

  On the other hand, as shown in FIGS. 4, 7, and 8, the outer ring of the ball bearing 75 is fitted on the inner peripheral surface of the annular release flange 66 of the clutch 60. On the inner ring of the ball bearing 75, a base end recessed portion 74a at the center of rotation of the operating lever 74 is fitted and fixed. The proximal end recessed portion 74a is recessed over two steps of a distal end small diameter portion and a large diameter portion. The tip small diameter portion is fitted into the inner ring of the ball bearing 75. A roller 73 projecting from the tip of the clutch lever 72 is engaged with the engaging cam hole 74c of the operating lever 74 that rotates.

  The clutch adjustment bolt 76 is fixed on the extension of the main shaft 51 of the right unit case cover 49. The clutch adjustment bolt 76 is inserted into the large diameter portion of the proximal end recessed portion 74a of the operating lever 74 from the right side, and supports the operating lever 74 so as to be rotatable and slidable in the axial direction. The clutch lifter plate 77 is constrained by the right unit case cover 49 to face the base end disc portion 74b around the base end recessed portion 74a of the operating lever 74 on the right side, and the clutch adjustment bolt is controlled. 76. The operating lever 74 is rotatable relative to the clutch lifter plate 77 that is restricted from rotating, and is movable in the axial direction. The actuating lever 74 is biased to the right by the spring force of the clutch spring 68 of the clutch 60 acting via the ball bearing 75.

  The base ends of the clutch lifter plate 77 and the operating lever 74 are changed by changing the relative position (screwing position) between the female thread portion formed on the rotating shaft portion of the clutch lifter plate 77 and the male thread portion of the clutch adjustment bolt 76. The space | interval of opposing surfaces with the disc part 74b can be increased / decreased. Thereby, the magnitude | size of the play of the moving direction in the clutch lifter mechanisms 74-79 can be increased / decreased.

  Grooves 74v and 77v are formed on the surfaces of the base end disc portion 74b of the operating lever 74 and the clutch lifter plate 77 facing each other radially at three locations in the circumferential direction. Between the base end disc portion 74 b and the clutch lifter plate 77, three release balls 79 held by the retainer 78 so as to be freely rotatable are connected to the base end disc portion 74 b urged by the clutch spring 68. It is interposed between the clutch lifter plate 77 and interposed.

  When the clutch 60 is in the connected state, the three grooves 74v and 77v on the opposed surfaces of the proximal end disc portion 74b and the clutch lifter plate 77 are opposed to each other. The three release balls 79 are in a state where they fall into the opposed grooves 74v and 77v, respectively.

When the shift spindle 55 rotates during gear shifting, the clutch lever 72 swings, and the operating lever 74 rotates through the engagement between the roller 73 and the engagement cam hole 74c. As a result, the groove 74v of the proximal end disc portion 74b of the operating lever 74 rotates relative to the groove 77v of the clutch lifter plate 77.
Then, the release ball 79 sandwiched between the base disc part 74b of the operating lever 74 and the clutch lifter plate 77 rolls and smoothly moves up the inclined surfaces of the grooves 74v and 77v, while operating the operating lever 74. Is moved to the clutch 60 side (left side). Therefore, the release flange 66 moves to the left against the urging force of the clutch spring 68 via the ball bearing 75, and the pressure plate 65 moves to the left. As a result, the clutch 60 is released and disconnected.

  As described above, the clutch lifter mechanism that disengages the clutch 60 by moving with respect to the clutch 60 from the operating lever 74, the ball bearing 75, the clutch adjusting bolt 76, the clutch lifter plate 77, the retainer 78, the release ball 79, and the like. 74 to 79 are configured.

  As shown in FIG. 7, the clutch operating mechanism 70 is configured outside the clutch 60 (right side) and inside the right unit case cover 49 (left side). On the other hand, a speed change operation mechanism 80 that operates the speed change device 50 to switch the speed stage is configured on the inner side (left side) of the clutch 60.

  The shift forks 91 and 92 move the shifter gear 51gs on the main shaft 51 and the shifter gear 52gs on the counter shaft 52 of the transmission 50 in the axial direction. As shown in FIG. 3, the shift forks 91 and 92 are arranged so as to rotate freely between the left and right unit cases 20 </ b> L and 20 </ b> R at an upper position between the main shaft 51 and the counter shaft 52. It works by movement.

  As shown in FIG. 7, the shift forks 91 and 92 are pivotally supported relative to the shift drum 90 at the base end portion. In the shift forks 91 and 92, engagement pins 91p and 92p projecting from the base end are slidably engaged with shift grooves of a predetermined shape formed on the outer peripheral surface of the shift drum 90. The front ends of the shift forks 91 and 92 are engaged with shifter gears 51gs and 52gs, respectively. Therefore, when the shift drum 90 is rotated, the shift forks 91 and 92 are moved in the axial direction via the engagement pins 91p and 92p guided in the shift groove and moved in the axial direction, so that the shift stage of the transmission 50 is shifted. Switch.

  As shown in FIGS. 6 and 7, the right end of the shift drum 90 is slidably supported by the right unit case 20R on the outer peripheral surface. The right side wall 90r of the shift drum 90 is exposed to the right side from the bearing opening of the right unit case 20R. A pentagonal star plate 93 is fixed to the central boss portion of the right side wall 90r by bolts 94. Around the bolt 94 on the right side wall 90r, five locking pins 95 are implanted. The locking pin 95 is provided between the right side wall 90 r and the star plate 93.

  As shown in FIG. 6, the stopper arm 96 is supported by a support shaft 96 p and is oscillated and biased by a spring 98. The locking roller 97 is pivotally supported at the tip of the stopper arm 96. A locking roller 97 is pressed against the outer peripheral surface of the star-shaped plate 93 provided with five ridges protruding in the radial direction. When the locking roller 97 is fitted and stabilized in the valley between the peak portions of the star plate 93, the shift drum 90 is positioned at a required position.

  A mechanism for rotating the shift drum 90 by acting on the locking pin 95 is configured along the right side surface of the right unit case 20R. As shown in FIGS. 6, 7, and 9 to 11, the gear shift arm 81 is externally fitted in a sleeve 81 d so as to be rotatable (swingable) relative to the shift spindle 55. The master arm 83 is externally fitted to the sleeve 81d of the gear shift arm 81 so as to be relatively rotatable (swingable).

  The master arm 83 includes a fan-shaped swing base end portion 83a and an arm portion 83b extending from above the swing base end portion 83a. A regulation opening 83h is formed in the swing base end 83a that overlaps the gear shift arm 81 in a side view. A spring locking piece 83f is bent leftward on the side of the regulation opening 83h on the swing center side. The gear shift arm 81 has a spring locking piece 81f formed by bending leftward. The spring locking piece 81f passes through the restriction opening 83h of the master arm 83.

  The restriction pin 84 projecting rightward from the right unit case 20 </ b> R passes through the restriction opening 83 h of the swing base end portion 83 a of the master arm 83. The tip of the restriction pin 84 is close to the gear shift arm 81. Then, both ends of the shift return spring 85 wound around the outer periphery of the sleeve 81d extend so as to sandwich the regulation pin 84 therebetween. The spring locking piece 81f of the gear shift arm 81 and the spring locking piece 83f of the master arm 83 have the same width as the diameter of the restriction pin 84, and are sandwiched together with the restriction pin 84 by both ends of the shift return spring 85. Yes.

In the vicinity of the upper end of the arm portion 83b extending above the master arm 83, a locking bar 87 is connected to the front end by a connecting pin 86 and extends rearward. The locking bar 87 extends rearward under five locking pins 95 planted between the shift drum 90 and the star plate 93.
A tension spring 88 is stretched between the upper end of the arm portion 83 b of the master arm 83 and the locking bar 87. The tension spring 88 swings upward and urges the locking bar 87 extending rearward to bring the locking bar 87 into contact with the locking pin 95 positioned on the lower side. Locking claws 87f and 87r protrude upward from the upper edge of the locking bar 87, spaced apart from each other.

  When no power is applied to the shift spindle 55, as shown by the solid line in FIG. 6, both ends of the shift return spring 85 sandwich the restriction pin 84 and at the same time, the spring locking piece 81f of the gear shift arm 81 and the master arm 83 The spring locking piece 83f is sandwiched. Further, the gear shift arm 81 and the master arm 83 are positioned so that the shift spindle 55, the spring locking piece 83f, the regulation pin 84, and the spring locking piece 81f are arranged in a line. At this time, the locking bar 87 abuts the upper edge between the front and rear locking claws 87f and 87r to the two locking pins 95 and 95 located on the lower side by the urging force of the tension spring 88.

When power is applied to the shift spindle 55 and rotated, the gear shift arm 81 swings against the shift return spring 85. When the spring locking piece 81 f acts on the master arm 83, the arm portion 83 b extending upward also swings in the front-rear direction in the master arm 83. Then, since the locking bar 87 connected to the master arm 83 by the connecting pin 86 moves in the front-rear direction, one of the front and rear locking claws 87f, 87r of the locking bar 87 is engaged with the locking pin 95. The shift drum 90 is rotated together with the star plate 93.
The star-shaped plate 93 is shifted by the pressing force of the locking roller 97 when the locking roller 97 at the tip of the stopper arm 96 exceeds the top of one peak of the star-shaped plate 93 by the rotation of the star-shaped plate 93. The drum 90 rotates with a predetermined angle until the locking roller 97 settles in the valley.

  Accordingly, when the locking bar 87 is moved in the front-rear direction due to the swing of the master arm 83, the locking claws 87f and 87r are locked to the locking pin 95, and the star plate 93 is locked by the locking roller 97. Up to the top of the mountain. Thereafter, the master arm 83, the gear shift arm 81, and the shift spindle 55 may return to the original state.

When the shift drum 90 rotates by a predetermined angle, the shift forks 91 and 92 that are guided in the shift groove and move in the axial direction move the shifter gears 51gs and 52gs of the transmission 50 to perform the shift stage switching. .
As will be described later, since the clutch 60 is disengaged before the gear shift in the transmission 50 is performed, the gear shift is smoothly performed.

The shift spindle 55 that drives both the shift operating mechanism 80 and the clutch operating mechanism 70 is rotated by the drive of the shift motor 100 being transmitted via the shift power transmission mechanism 110. The transmission power transmission mechanism 110 will be described below.
As shown in FIG. 2, the shift spindle 55 is disposed obliquely rearward and downward of the crankshaft 22 and obliquely forwardly and downwardly of the main shaft 51 and penetrates the left and right unit cases 20L and 20R to the left and right outer sides. Yes.

As shown in FIG. 7, the right side portion of the shift spindle 55 that penetrates the right unit case 20 </ b> R further penetrates the bearing boss portion 49 a of the right unit case cover 49. An angle sensor 121 that detects the rotation angle of the right end portion of the shift spindle 55 is provided at the right end portion of the shift spindle 55 that passes through the bearing boss portion 49 a of the right unit case cover 49.
A shift power transmission mechanism 110 is provided on the left side of the shift spindle 55 that penetrates the left unit case 20L. The transmission power transmission mechanism 110 is housed in a flat transmission power transmission case 102 that is long in the front-rear direction and narrow in the left-right width.

  The transmission power transmission case 102 is configured by combining a left transmission gear transmission case 102L and a right transmission power transmission case 102R which are divided into left and right parts. The shift spindle 55 is inserted into the front end portion of the transmission power transmission case 102 and extends rearward. As shown in FIG. 2, the transmission power transmission case 102 covers the ACG cover 43, which is a unit case cover that covers the AC generator 41 on the side of the crankshaft 22, and the output sprocket 13 on the side of the counter shaft 52. It is disposed below the sprocket cover 53.

  In the transmission power transmission mechanism 110, when the shift motor 100 is driven and the drive gear shaft 100 a rotates, this rotation is decelerated via the reduction gear 111 and transmitted to the rotation of the crank gear 112. The rotation of the crank gear 112 swings the swing arm 116 via the crank pin 114p, and rotates the shift spindle 55 integrated with the swing arm 116. When the shift spindle 55 rotates, the clutch operating mechanism 70 operates the speed change clutch 60 to disconnect and connect the clutch, and the speed change operation mechanism 80 operates the speed change device 50 to change the gear position.

Next, configurations related to the delay mechanism and the lost mechanism of the transmission 50 will be described with reference to FIGS.
As shown in FIGS. 9 to 12, the transmission 50 mainly includes a single shift spindle 55, a master arm 83, a gear shift arm 81, and a shift return spring 85 as a configuration related to the delay mechanism and the lost mechanism. , A preload stopper collar 56, a power storage spring 57, a power storage collar 71, and a clutch lever 72.

  In the transmission 50, the power storage spring 57 functions as a power storage mechanism capable of storing the rotational force transmitted from the shift spindle 55 to the master arm 83. Between the shift spindle 55 and the clutch 60, there is provided a delay mechanism that delays the disengagement operation of the clutch 60 by the clutch lever 72 until the accumulation of the rotational force by the accumulation spring 57 is completed. This delay mechanism functions as a lost mechanism that does not allow a part of the rotation angle of the shift spindle 55 to contribute to the clutch 60 disengagement operation by the clutch lever 72.

  As shown in FIG. 13, the shift spindle 55 includes an abutting portion 55a provided at the center in the axial direction, a serration portion 55b provided on the left side adjacent to the abutting portion 55a in the axial direction, and an abutting portion 55a. And a serration portion 55c provided on the opposite side (right side) of the serration portion 55b with a gap from the abutting portion 55a.

  As shown in FIGS. 9 to 12 and 14, the master arm 83 is swingably supported by the shift spindle 55. The master arm 83 transmits the rotational force of the shift spindle 55 to the shift drum 90, and rotates and operates the shift drum 90 as described above. The master arm 83 includes a swing base end portion 83a, an arm portion 83b, a restriction opening 83h, a spring locking piece 83f, a sleeve 83d, and an insertion hole 83c.

The swing base end portion 83a has a fan shape that expands toward the distal end side. The arm part 83b extends from above the swinging base end part 83a. The restriction opening 83h is formed at a position overlapping the gear shift arm 81 in a side view of the restriction opening 83h. The spring locking piece 83f is formed by bending (projecting) leftward on the side of the regulation opening 83h on the swing center side. The sleeve 83d is provided so as to extend along the axial direction at the swing center of the master arm 83 and to protrude in the protruding direction of the spring locking piece 83f. The insertion hole 83 c is provided so as to penetrate the inside of the sleeve 83 d along the axial direction of the master arm 83. A sleeve 81d (described later) of the gear shift arm 81 is inserted into the insertion hole 83c.
The locking bar 87 is as described above.

  As shown in FIGS. 9 to 12 and 15, the gear shift arm 81 is in contact with the master arm 83 and is rotatably supported by the shift spindle 55. The gear shift arm 81 includes a swing base end portion 81e, a spring locking piece 81f, a gear shift arm side locking portion 81a, a first dowel hole 81b, an insertion hole 81c, and a sleeve 81d.

  The swing base end portion 81e has a shape that narrows toward the distal end side. The swing base end portion 81 e is disposed adjacent to the right side of the swing base end portion 83 a of the master arm 83. The spring locking piece 81f is formed by bending (extending) the distal end side of the gear shift arm 81 to the left. The spring locking piece 81f passes through the restriction opening 83h of the master arm 83 from the right side to the left side.

  The sleeve 81d is provided so as to extend along the axial direction at the swing center of the gear shift arm 81 and to protrude in the protruding direction of the spring locking piece 81f. The insertion hole 81 c is provided so as to penetrate the inside of the sleeve 81 d along the axial direction of the gear shift arm 81. The shift spindle 55 is inserted through the insertion hole 81c.

  The gear shift arm side locking portion 81a is located on the master arm 83 side with respect to the force accumulation spring 57, and protrudes to the right at a peripheral portion spaced radially from the insertion hole 81c in the swing base end portion 81e. The gear shift arm side locking portion 81a is provided in the lower left region when the gear shift arm 81 is viewed from the right side to the left side in the axial direction, and extends in an arc shape in the circumferential direction. The first dowel hole 81 b is linked to a first dowel tooth 56 a (described later) of the preload stopper collar 56. The first dowel hole 81b is formed on the left side of the swing base end 81e adjacent to the insertion hole 81c so as to be recessed. The first dowel hole 81b is provided in the lower right region when the gear shift arm 81 is viewed from the right side to the left side in the axial direction, and extends in an arc shape in the circumferential direction, and its central angle is about 60 degrees. .

The preload stopper collar 56 rotates integrally with the shift spindle 55 by being fitted to the serration portion 55b. As shown in FIGS. 9 to 12 and 16, the preload stopper collar 56 includes a collar body 56b, a first dowel tooth 56a, and an inner peripheral serration portion 56c. The color main body 56b has a substantially cylindrical shape. The first dowel tooth 56a protrudes to the left from the left end surface of the collar body 56b. The first dowel tooth 56a extends in an arc shape in the circumferential direction, and its central angle is about 45 degrees.
The center angle of the first dowel tooth 56a is smaller than the center angle of the first dowel hole 81b. That is, arc-shaped play (gap or play) exists in the circumferential direction between the first dowel tooth 56a and the first dowel hole 81b.

  The inner peripheral serration portion 56 c is provided on the inner peripheral portion of the collar main body 56 b and is serrated to the serration portion 55 b of the shift spindle 55. In a state where the inner peripheral serration portion 56 c is serrated and fitted to the serration portion 55 b of the shift spindle 55, the right end surface of the collar body 56 b comes into contact with the abutting portion 55 a of the shift spindle 55.

The accumulation spring 57 urges the master arm 83 in the swinging direction while accumulating the rotational force of the shift spindle 55 between the shift spindle 55 and the master arm 83. In the present specification, “accumulating rotational force” includes appropriately “accumulating a rotational angle”. The accumulator spring 57 can accumulate the rotational force transmitted from the shift spindle 55 to the master arm 83.
As shown in FIGS. 9, 11, and 17, the energy storage spring 57 has a coil shape and is provided so as to directly cover the peripheral surface of the shift spindle 55. “Directly covering” means that no other member is interposed between the force accumulation spring 57 as the force accumulation mechanism and the shift spindle 55.
One end portion 57 a of the power storage spring 57 is locked to the gear shift arm side locking portion 81 a, and the other end portion 57 b is locked to the power storage collar side locking portion 71 a of the power storage collar 71. The accumulator spring 57 expresses an urging force in a direction to rotate the shift drum 90 to the shift-up side.
As described above, the gear shift arm side locking portion 81 a and the accumulation collar side locking portion 71 a are formed from bosses extending in parallel with the axial direction of the shift spindle 55.

As shown in FIGS. 9, 11, and 18, the accumulator collar 71 is arranged on the clutch lever 72 side with respect to the gear shift arm 81, and is fixed to the shift spindle 55 and rotates (rotates) integrally.
The accumulating collar 71 includes a collar body 71d, an accumulating collar side locking portion 71a, a second dowel tooth 71b, and an inner peripheral serration portion 71c.
The color main body 71d has a substantially cylindrical shape. The accumulating collar side locking portion 71a is located on the clutch lever 72 side with respect to the accumulating spring 57, and protrudes to the left from the left end surface of the collar body 71d. The accumulating collar side locking portion 71a extends in an arc shape in the circumferential direction, and its central angle is about 60 degrees.

The second dowel teeth 71 b protrude rightward from the right and left end surfaces of the collar body 71 d and are linked to second dowel holes 72 b (described later) of the clutch lever 72. The second dowel tooth 71b extends in an arc shape in the circumferential direction, and its central angle is about 30 degrees. Three second dowel teeth 71b are provided apart from each other in the circumferential direction. The angle between the second dowel teeth 71b adjacent in the circumferential direction is about 90 degrees. When the accumulating collar 71 is viewed in the axial direction, the accumulating collar side locking portion 71a and the three second dowel teeth 71b are arranged at positions that do not overlap.
The inner peripheral serration portion 71 c is provided on the inner peripheral portion of the collar main body 71 d and is serrated to the serration portion 55 c of the shift spindle 55.

  In the present embodiment, the accumulator collar 71 is integrally formed, but is not limited thereto. For example, the accumulator collar 71 is a separate body divided in the axial direction into the accumulator collar side locking portion 71a side and the second dowel tooth 71b side at the position shown by the two-dot chain line D in FIG. It can also comprise from the member.

As shown in FIGS. 9, 19, and 20, the clutch lever 72 is rotatably supported by the shift spindle 55 and operates the clutch 60. The clutch lever 72 includes a base end portion 72d, a lever portion 72e, a wall portion 72a, a second dowel hole 72b, and an insertion hole 72c.
The lever portion 72e extends from the base end portion 72d. On the left end side of the base end portion 72d, three second dowel holes 72b and three wall portions 72a are provided.

The three second dowel holes 72 b are disposed at positions corresponding to the three second dowel teeth 71 b in the power storage collar 71. The second dowel hole 72b is inserted with the second dowel tooth 71b. That is, the dowel tooth 71b and the dowel hole 72b are linked to each other.
The second dowel hole 72b extends in an arc shape in the circumferential direction, and its central angle is about 40 degrees, which is larger than the central angle of the second dowel tooth 71b. That is, between the second dowel tooth 71b and the second dowel hole 72b, there is a play in the circumferential direction and an arcuate shape (gap or backlash). The delay mechanism is constituted by the play in the circumferential direction (gap, backlash).
The wall portion 72a is provided between the second dowel holes 72b adjacent in the circumferential direction.
The insertion hole 72 c is provided so as to penetrate the inside of the base end portion 72 d along the axial direction of the clutch lever 72. The shift spindle 55 is inserted through the insertion hole 72c.

  As shown in FIGS. 7 and 9, the gear shift arm side locking portion 81 a and the accumulation collar side locking portion 71 a are disposed on the opposite side of the clutch 60 with respect to the axial direction of the shift spindle 55. . The clutch lever 72 and the master arm 83 are disposed to face each other with the clutch 60 interposed therebetween in the axial direction of the shift spindle 55. In the speed change operation, the master arm 83 and the clutch lever 72 are interlocked with each other. Details of this interlocking operation will be described later.

Next, the interlocking operation of the master arm 83 and the clutch lever 72 in the shifting operation by the transmission 50 will be described with reference to FIGS.
FIGS. 21A and 21B are diagrams showing changes in the positional relationship between the constituent members in association with the shifting operation. FIG. 21A is a diagram mainly showing the positional relationship on the master arm 83 side with respect to the accumulator spring 57, and FIG. FIG. 6 is a diagram mainly showing a positional relationship on the clutch lever 72 side with respect to the accumulation spring 57. 22A and 22B are diagrams showing a state in which the speed change operation has progressed more than in FIG. 23A and 23B are diagrams showing a state in which the speed change operation has progressed more than in FIG. 24A and 24B are diagrams showing a state in which the speed change operation has proceeded more than in FIG. FIGS. 25A and 25B are diagrams showing a state in which the speed change operation has proceeded more than in FIG. FIGS. 26A and 26B are diagrams showing a state in which the speed change operation has proceeded more than in FIG. FIG. 27 is a diagram illustrating the relationship between the shift spindle angle, the accumulation spring angle, the clutch lift amount, the shift drum angle, and the like as the speed change operation progresses.

Here, the shifting operation at the time of up-shifting will be described. FIG. 21 shows a state before the start of the shifting operation, which corresponds to “start” in FIG.
In FIG. 27, changes in the angle (Ang) of the shift spindle 55, the angle (Ang) of the accumulator spring 57, the clutch lift amount, the angle (Ang) of the shift drum 90, etc., and their relationship with the progress of the speed change operation Is shown.

  As shown in FIG. 21 (a), before the speed change operation is started, there is a gap (play) between the spring locking piece 81f of the gear shift arm 81 and the restriction opening 83h of the master arm 83 in the shift-up direction SU. ) Exists. A gap (play) exists in the shift-up direction SU between the first dowel tooth 56 a of the preload stopper collar 56 and the first dowel hole 81 b of the gear shift arm 81. There is no gap (play) in the shift-up direction SU between the one end portion 57a of the energy storage spring 57 and the gear shift arm side locking portion 81a of the gear shift arm 81. The shift-up direction SU is a clockwise direction in FIGS.

  Further, as shown in FIG. 21B, a gap (play) exists in the shift-up direction SU between the second dowel tooth 71b of the accumulation collar 71 and the second dowel hole 72b of the clutch lever 72. ing. There is no gap (play) in the shift-up direction SU between the accumulation collar side locking portion 71 a of the accumulation collar 71 and the other end portion 57 b of the accumulation spring 57.

When the rotation of the shift spindle 55 starts from the state before the start of the shift operation shown in FIG. 21, the state shown in FIG. 22 is obtained. FIG. 22 shows a state corresponding to [1] in FIG.
When the shift spindle 55 rotates, the accumulation collar 71 integrated therewith also rotates. In the state before the start of the speed change operation shown in FIG. 21, the force accumulation spring 57 is in contact with the force accumulation collar 71 and the gear shift arm 81. Therefore, in the state shown in FIG. 22, when the accumulator collar 71 rotates, the accumulator spring 57 in contact with the accumulator collar 71 also rotates together, and immediately, the gear shift in contact with the accumulator spring 57. The arm 81 also rotates.

  As shown in FIG. 22A, the gear shift arm 81 rotates in the upshift direction SU, and the spring locking piece 81 f comes into contact with the restriction opening 83 h of the master arm 83. Further, the preload stopper collar 56 (integrated with the shift spindle 55) rotates in the shift-up direction SU, and the first dowel tooth 56a of the preload stopper collar 56 goes around the inside of the first dowel hole 81b of the gear shift arm 81. Move in the direction. As shown in FIG. 22B, the accumulation collar 71 (integrated with the shift spindle 55) rotates in the shift-up direction SU and accumulates via the accumulation collar side locking portion 71a and the other end portion 57b. An attempt is made to rotate the force spring 57 in the shift-up direction SU.

On the other hand, the gear shift arm 81 is configured not to rotate when the clutch 60 is in a connected state and a driving force is generated. That is, the gear shift arm side locking portion 81a does not move. For this reason, the force accumulation is started in the force accumulation spring 57 in which the one end portion 57a is engaged with the gear shift arm side engagement portion 81a.
In FIG. 22A, the rotation angle of the preload stopper collar 56 is slight, so that it hardly appears. In FIG. 22 (b), the rotation angle of the accumulator collar 71 is slight and therefore hardly appears.

When the rotation of the shift spindle 55 proceeds from the state shown in FIG. 22, the state shown in FIG. 23 is obtained. FIG. 23 shows a state corresponding to between [1] and [2] in FIG.
As shown in FIG. 23A, the preload stopper collar 56 rotates further in the shift-up direction SU than the position shown in FIG. 22A, and the first dowel teeth 56a of the preload stopper collar 56 are gear shift arms. The inside of the first dowel hole 81b 81 moves further in the circumferential direction than the position shown in FIG. As a result, the power accumulation proceeds in the power accumulation spring 57.
Further, as shown in FIG. 23B, the second dowel tooth 71 b of the accumulator collar 71 moves in the circumferential direction until there is no gap (play) with the second dowel hole 72 b of the clutch lever 72.

When the rotation of the shift spindle 55 proceeds from the state shown in FIG. 23, the state shown in FIG. 24 is obtained. FIG. 24 shows a state corresponding to [2] to [3] in FIG.
As shown in FIG. 24A, the preload stopper collar 56 rotates further in the shift-up direction SU than the position shown in FIG. 23A, and the first dowel tooth 56a of the preload stopper collar 56 is a gear shift arm. The inside of the first dowel hole 81b of 81 is moved further in the circumferential direction than the position shown in FIG. As a result, the accumulated force advances in the accumulated spring 57, and a sufficient amount of accumulated force to rotate the master arm 83 is completed.
As shown in FIG. 24B, when there is no gap (play) between the clutch lever 72 and the second dowel hole 72b, the rotation of the clutch lever 72 is started. For example, the clutch 60 is disengaged (clutch lift).

When the rotation of the shift spindle 55 proceeds from the state shown in FIG. 24, the state shown in FIG. 25 is obtained. FIG. 25 shows a state corresponding to [3] in FIG.
As shown in FIG. 25A, the preload stopper collar 56 rotates further in the shift-up direction SU than the position shown in FIG. 24A, and the first dowel tooth 56a of the preload stopper collar 56 is a gear shift arm. The inside of the first dowel hole 81b 81 moves further in the circumferential direction than the position shown in FIG. As a result, until the circumferential clearance (play) between the first dowel tooth 56a and the first dowel hole 81b disappears, the accumulated force advances in the accumulation spring 57 and is sufficient to rotate the master arm 83. Accumulated amount of energy is exceeded.
Further, when the clutch 60 is sufficiently disengaged, the driving force is reduced and is in a disconnected state. As a result, the rotation of the shift drum 90 and the rotation of the gear shift arm 81 are possible.

When the rotation of the shift spindle 55 proceeds from the state shown in FIG. 25, the state shown in FIG. 26 is obtained. FIG. 26 shows a state corresponding to [3] to [4] in FIG.
When the driving force is released, the accumulated force by the accumulation spring 57 is released, and the master arm 83 is immediately rotated by this accumulated force. The shift drum 90 is rotated by the rotation of the master arm 83, and a shift up is performed. When the rotation angle of the shift drum 90 exceeds a predetermined reversal start threshold value, the shift spindle 55 starts reversing (starts rotating in the shift down direction). The rotation of the master arm 83 stops when the restriction pin 84 comes into contact with the restriction opening 83h.

  As described above, the delay mechanism can delay the disengagement operation of the clutch 60 by the clutch lever 72 until the accumulation force by the accumulation spring 57 is completed. Further, the delay mechanism can function as a lost mechanism that does not allow a part of the rotation angle of the shift spindle 55 to contribute to the disconnection operation of the clutch 60 by the clutch lever 72.

  Further, by changing the relative position of the clutch lifter plate 77 and the clutch adjustment bolt 76, the distance between the opposing surfaces of the clutch lifter plate 77 and the base end disc part 74b of the operating lever 74 can be increased or decreased. Thereby, the magnitude | size of the play of the moving direction in the clutch lifter mechanisms 74-79 can be increased / decreased. For example, if the play is large, the amount of movement of the clutch lifter mechanisms 74 to 79 required to disengage the clutch 60 is larger than when the play is small. Utilizing this, the delay mechanism can also be configured by play in the moving direction in the clutch lifter mechanisms 74 to 79 that disengage the clutch 60 by moving with respect to the clutch 60.

According to the transmission 50 of the present embodiment, for example, the following effects can be obtained.
The transmission 50 according to the present embodiment includes a clutch lever 72 that operates the clutch 60, a master arm 83 that rotates the shift drum 90 by transmitting the rotational force of the shift spindle 55 to the shift drum 90, and a shift spindle. An accumulating spring 57 that urges the master arm 83 in the swinging direction while accumulating the rotational force of 55, a gear shift arm 81 that contacts the master arm 83 and has a gear shift arm side locking portion 81a, and a shift spindle 55 And a power storage collar 71 having a power storage collar side locking portion 71a. One end portion 57a of the power storage spring 57 is locked to the gear shift arm side locking portion 81a, and the other end portion 57b is locked to the power storage collar side locking portion 71a.

  Therefore, according to the transmission 50 of the present embodiment, the gear shift arm 81 and the clutch lever 72 having a large diameter are wrapped in the axial direction, and the one end portion 57a that is an engaging portion of the force accumulation spring 57 that can set the diameter small. The (gear shift arm side locking portion 81a) and the other end portion 57b (power accumulation collar side locking portion 71a) can be arranged on the radially outer side of the clutch 60. Thereby, the size of the periphery of the power storage mechanism in the transmission 50 can be made compact while the power storage mechanism is configured by the power storage spring 57.

  In the transmission 50 according to the present embodiment, the gear shift arm side locking portion 81 a and the accumulation collar side locking portion 71 a are formed from bosses extending in parallel with the axial direction of the shift spindle 55. Therefore, according to the transmission 50 of the present embodiment, the radial protrusion of the gear shift arm side locking portion 81a and the accumulation collar side locking portion 71a can be suppressed as much as possible.

  The transmission 50 according to the present embodiment is in contact with the master arm 83, is rotatably supported by the shift spindle 55, and has a gear shift arm 81 having a gear shift arm side locking portion 81 a, and a clutch lever 72 with respect to the gear shift arm 81. And an accumulator collar 71 that rotates integrally with the shift spindle 55 and has an accumulator collar side locking portion 71a. Therefore, the engagement position and engagement structure between the force accumulation spring 57 and the master arm 83 and the engagement position and engagement structure between the force accumulation spring 57 and the clutch lever 72 can be set flexibly.

  In the transmission 50 according to the present embodiment, the gear shift arm side locking portion 81 a and the force accumulation collar side locking portion 71 a are disposed on the opposite side of the clutch 60 with respect to the axial direction of the shift spindle 55. Therefore, according to the transmission 50 of the present embodiment, it is possible to easily avoid interference between the clutch 60 and the gear shift arm side locking portion 81a and the accumulation collar side locking portion 71a.

  The transmission 50 according to the present embodiment further includes a preload stopper collar 56 that rotates integrally with the shift spindle 55 and has first dowel teeth 56a. The gear shift arm 81 has a first dowel hole 81b linked to the first dowel tooth 56a. Therefore, according to the transmission 50 of the present embodiment, it is easy to provide an upper limit for the power storage angle, and it is possible to prevent an excessive power storage load from being applied to the transmission 50 and its peripheral components.

  In the transmission 50 of the present embodiment, the energy storage spring 57 expresses an urging force in a direction in which the shift drum 90 is rotated to the shift-up side, and the clutch 60 is a sleeper clutch. Therefore, according to the transmission 50 of this embodiment, the back torque at the time of downshifting can be reduced even when power can be stored only in one direction.

  In the transmission 50 of the present embodiment, the clutch lever 72 is rotatably supported by the shift spindle 55 and has a second dowel hole 72b. The accumulating collar 71 has second dowel teeth 71b that are linked to the second dowel holes 72b. Therefore, according to the transmission 50 of the present embodiment, the clutch lever 72 can be rotated by the accumulation collar 71.

As mentioned above, although preferable embodiment of this invention was described, this invention can be implemented with a various form, without being restrict | limited to embodiment mentioned above.
For example, the vehicle to which the transmission of the present invention is applied is not limited to a motorcycle, and may be a straddle-type vehicle other than a motorcycle.

1 Motorcycle (vehicle)
50 Transmission 55 Shift spindle 56 Preload stopper collar 56a First dowel tooth 57 Power storage spring (power storage mechanism)
57a One end portion 57b The other end portion 60 Clutch 71 Power storage collar (delay member)
71a Power storage collar side locking portion (locking portion located on the clutch lever side)
71b Second dowel tooth 72 Clutch lever 72b Second dowel hole 73 Roller 74 Actuation lever (clutch lifter mechanism)
75 Ball bearing (clutch lifter mechanism)
76 Clutch adjustment bolt (clutch lifter mechanism)
77 Clutch lifter plate (Clutch lifter mechanism)
78 Retainer (Clutch lifter mechanism)
79 Release ball (clutch lifter mechanism)
81 Gear shift arm 81a Gear shift arm side locking part (locking part located on the master arm side)
81b First dowel hole 81f Spring locking piece 83 Master arm 83f Spring locking piece 85 Shift return spring 86 Connecting pin 87 Locking bar 90 Shift drum

Claims (7)

A shift spindle (55);
A clutch lever (72) provided on the shift spindle (55) for operating the clutch (60);
A master that is swingably supported by the shift spindle (55), and that transmits the rotational force of the shift spindle (55) to a shift drum (90) of a transmission to rotate and operate the shift drum (90). An arm (83);
An accumulating spring that urges the master arm (83) in the swinging direction while accumulating the rotational force of the shift spindle (55) between the shift spindle (55) and the master arm (83). 57) a vehicle transmission (50) comprising:
The clutch lever (72) and the master arm (83) are arranged opposite to each other with the clutch (60) in between in the axial direction of the shift spindle (55),
The accumulator spring (57) has a coil shape, and its one end (57a) is locked to a locking portion (81a) located on the master arm (83) side and the other end (57b). ) Is locked to a locking portion (71a) located on the clutch lever (72) side, the transmission (50) of the vehicle. The locking portion (81a) located on the master arm (83) side and the locking portion (71a) located on the clutch lever (72) side extend in parallel to the axial direction of the shift spindle (55). The transmission (50) of a vehicle according to claim 1, formed from a boss. A gear shift arm side locking portion (81a) as a locking portion that contacts the master arm (83), is rotatably supported by the shift spindle (55), and is positioned on the master arm (83) side. A gear shift arm (81) having;
The gear shift arm (81) is arranged on the clutch lever (72) side, rotates integrally with the shift spindle (55), and stores as a locking portion located on the clutch lever (72) side. The transmission (50) for a vehicle according to claim 1, further comprising an accumulation collar (71) having a force collar side locking portion (71a). The locking portion (81a) located on the master arm (83) side and the locking portion (71a) located on the clutch lever (72) side are in the axial direction of the shift spindle (55). The vehicle transmission (50) according to claim 2, wherein the transmission (50) is disposed on a side opposite to the clutch (60). A preload stopper collar (56) rotating integrally with the shift spindle (55) and having a first dowel tooth (56a);
The transmission (50) of a vehicle according to claim 3, wherein the gear shift arm (81) has a first dowel hole (81b) linked to the first dowel tooth (56a). The energy storage spring (57) expresses a biasing force in a direction to rotate the shift drum (90) to the shift-up side,
The vehicle transmission (50) according to claim 2, wherein the clutch (60) is a sleeper clutch. The clutch lever (72) is rotatably supported by the shift spindle (55) and has a second dowel hole (72b).
The transmission (50) of a vehicle according to claim 3, wherein the accumulator collar (71) has a second doweled tooth (71b) linked to the second doweled hole (72b).

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