JP5030899B2 - Vehicle transmission - Google Patents

Description

  According to the present invention, a gear transmission mechanism in which a gear train of a plurality of speed stages that can be selectively established is provided between a speed change input shaft and a speed change output shaft, and the gear train is selectively established according to a rotational position. Thus, the shift drum that is rotatably supported by the engine case, the shift drive shaft that is rotatably attached to the engine case so as to rotate in response to a shift operation, and the rotation of the shift drive shaft The shift drum can be rotationally driven according to the shift drive shaft and a shift drive force transmission mechanism provided between the shift drive shaft and the shift drum, and the shift drive force transmitted from the shift drive shaft is temporarily stored. Thus, the present invention relates to a transmission for a vehicle including a lost motion spring interposed in the shift driving force transmission mechanism.

In a transmission of a vehicle, a shift drive shaft that rotates according to the operation of the shift actuator or a shift spindle to which a manual shift operation is input in order to improve the feeling during shifting and reduce the load acting on the shift actuator Patent Document 1 discloses that a lost motion spring is interposed in a shift driving force transmission mechanism provided between the shift drum and the shift drum.
JP 05-039865 A

  In the device disclosed in Patent Document 1, a lost motion mechanism including a lost motion spring is accommodated between an engine case and a gear housing coupled to the engine case. As the shift drive force transmission mechanism increases in size in the axial direction of the shift drum, a dedicated engine case and gear housing are required, and versatility with other transmission cases that do not have a lost motion mechanism. It is difficult to have

  The present invention has been made in view of such circumstances, and provides a vehicle transmission that eliminates the need for cases such as a dedicated engine case and shift cover even if a lost motion mechanism including a lost motion spring is provided. With the goal.

In order to achieve the above object, a first aspect of the present invention is directed to a gear transmission mechanism in which a gear train of a plurality of speed stages that can be selectively established is provided between a transmission input shaft and a transmission output shaft, The gear train is selectively established in accordance with the shift drum, and the shift drum is rotatably supported on the engine case. The gear drum is rotatably attached to the engine case so as to rotate in response to a shift operation. A shift drive shaft, a shift drive force transmission mechanism provided between the shift drive shaft and the shift drum that enables the shift drum to be driven to rotate according to the rotation of the shift drive shaft, and the shift drive shaft And a lost motion spring interposed in the shift driving force transmission mechanism so as to temporarily store the shift driving force transmitted from the vehicle. The power transmission mechanism includes a first transmission rotation member provided on the shift drive shaft side on a transmission path by the shift driving force transmission mechanism, and the shift drum more than the first transmission rotation member on the transmission path. And a second transmission rotating member provided between the first transmission rotating member and the first transmission rotating member, the engine case housing the gear train of a plurality of shift stages shift cover through the wall member is coupled to Rutotomoni, working chamber that houses the shift drive force transmitting mechanism, the engine case, wherein formed between the wall member and the shift cover, the shift drum is once guide plates having a restricting projection for restraining the excessive rotation when the rotational motion is, characterized in that attached to the wall member.

In addition to the configuration of the invention described in claim 1 , the invention according to claim 2 is characterized in that the first transmission rotating member rotates in conjunction with the rotation of the shift drive shaft. And at least a part of the second transmission rotating member that is coaxially arranged with the shift drum is accommodated in the first transmission rotating member, and surrounds the first transmission rotating member. Engaging portions extending inwardly of the lost motion spring are provided at both ends of the lost motion spring, each of which is formed in the shape and to which the rotational force is transmitted from the first transmission rotating member. In addition, one of the two engaging portions can be engaged from one circumferential direction of the second transmission rotating member, and the other of the both engaging portions is the other circumferential direction of the second transmission rotating member. And a latching portion that can be engaged with each other.

  The main shaft 12 of the embodiment corresponds to the speed change input shaft of the present invention, the counter shaft 13 of the embodiment corresponds to the speed change output shaft of the present invention, and the shift spindle 60 of the embodiment corresponds to the shift drive shaft of the present invention. The drum shifter 73 of the embodiment corresponds to the second transmission rotation member of the present invention, and the transmission rotation member 75 of the embodiment corresponds to the first transmission rotation member of the present invention.

According to the present invention, the working chamber that houses the shift driving force transmission mechanism including the first and second transmission rotating members and the lost motion spring includes an engine case, a wall member, and the wall member. Since the shift driving force transmission mechanism is enlarged in the axial direction of the shift drum by the amount of the lost motion mechanism, the shift cover is sandwiched between the engine case and the shift cover. By sandwiching the wall member, it is possible to secure a space for arranging the shift driving force transmission mechanism, and it is possible to cope with a transmission without a lost motion mechanism by removing the wall member. Even if a lost motion mechanism including a lost motion spring is provided, cases such as a dedicated engine case and a dedicated shift cover can be eliminated.

In addition, since the guide plate having the restricting protrusion that restricts the excessive rotation of the drum shifter is attached to the wall member, it is not necessary to perform processing for attaching the guide plate to the engine case side.

According to the second aspect of the present invention, the first transmission rotation member that rotates in conjunction with the rotation of the shift drive shaft is disposed coaxially with the shift drum, and is disposed coaxially with the shift drum. At least a part of the transmission rotation member is accommodated in the first transmission rotation member, and is provided at both ends of a lost motion spring formed in a coil shape so as to surround the first transmission rotation member and extend inward. Since the joint portion can be engaged with the engaging portion provided on the second transmission rotating member from both sides in the circumferential direction of the second transmission rotating member, the coiled lost motion spring is disposed radially outward. In addition, it is not necessary to secure a space for engaging both ends of the lost motion spring with the transmission rotating member, the space for disposing the lost motion mechanism including the lost motion spring can be reduced, and the wall portion Can a thinner, it is possible to further reduce the transmission.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on examples of the present invention shown in the accompanying drawings.

  1 to 13 show a first embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a main part of a motorcycle transmission, FIG. 2 is an enlarged view taken along arrow 2 in FIG. 1, and FIG. 4 is a cross-sectional view taken along line 3-3, FIG. 4 is a perspective view with the shift cover and gear cover removed from FIG. 2, FIG. 5 is a cross-sectional view taken along line 5-5 in FIG. 3, and FIG. 7 is a sectional view taken along the line 7-7 in FIG. 6, FIG. 8 is a perspective view showing a part of the shift driving force transmission mechanism with the transmission rotating member cut away, and FIG. 9 is a transmission rotating member. 8 is a perspective view corresponding to FIG. 8 with the lost motion spring removed, FIG. 10 is a sectional view taken along line 10-10 in FIG. 3, FIG. 11 is a sectional view taken along line 11-11 in FIG. FIG. 13 is a block diagram showing a control system for controlling the operation of the shift restricting mechanism.

  First, in FIG. 1, this transmission is for a motorcycle, for example, and has a main shaft 12 and a transmission output shaft as a transmission input shaft that have mutually parallel axes and are rotatably supported by an engine case 11. A gear train G1, G2, G3, G4, G5, and G6 having a plurality of shift speeds, for example, six speeds that can be selectively established, are provided between the countershaft 13 and the countershaft 13. A gear transmission mechanism 10 is provided, and the first to sixth speed gear trains G <b> 1 to G <b> 6 are housed in the engine case 11.

  Between the crankshaft (not shown) of the engine, which is a power source output shaft, and one end of the main shaft 12, a clutch 14 for switching power transmission / disconnection is provided. A clutch outer 17 to which power is transmitted from the shaft via the primary speed reducer 15 and the torque damper 16, a clutch inner 18 disposed in the center of the clutch outer 17 and coupled to the main shaft 12 in a relatively non-rotatable manner; A plurality of drive friction plates 19 that are spline-fitted to the inner peripheral wall of the clutch outer 17 so as to be axially slidable, and these drive friction plates 19 are alternately stacked and axially slid on the outer periphery of the clutch inner 18. A plurality of driven friction plates 20 that are movably spline-fitted, and an innermost drive friction plate 19 are received. A pressure receiving plate 21 provided integrally with the inner end of the latch inner 18, a pressure plate 22 slidably attached to the outer end of the clutch inner 18 so that the outermost driving friction plate 19 can be pressed, and the pressure plate 22 receiving pressure. And a clutch spring 23 that urges toward the plate 21 side.

  Thus, when the driving friction plates 19 and the driven friction plates 20 are clamped between the pressure plate 22 and the pressure receiving plate 21 by the urging force of the clutch spring 23, the clutch 14 is connected between the clutch outer 17 and the clutch inner 18. The clutch is engaged (power transmission state).

  Further, a release member 25 having a release bearing 24 interposed between the clutch inner 18 and the pressure plate 22 is disposed. The release member 25 can move in the axial direction within the main shaft 12. The push rod 26 to be inserted is connected. A clutch actuator 30 capable of exerting a pressing force is connected to the push rod 26. When the push rod 26 is pushed by the clutch actuator 30, the pressure plate 22 moves backward against the spring force of the clutch spring 23. As a result, the drive friction plates 19 and the driven friction plates 20 are freed, and the clutch 14 is in a clutch-off state (power cut-off state) in which the clutch outer 17 and the clutch inner 18 are not connected. .

  A part of the countershaft 13 protrudes from the engine case 11 on the side opposite to the clutch 14, and a drive sprocket 27 is fixed to the protruding end of the countershaft 13 from the engine case 11. Thus, the drive sprocket 27 constitutes a part of the transmission means 29 together with the endless chain 28 wound around the drive sprocket 27, and the power output from the countershaft 13 passes through the transmission means 29. To a rear wheel (not shown).

  Incidentally, the first speed gear train G1 is a first speed drive gear 31 formed integrally with the main shaft 12 and a first speed drive gear 31 and a counter shaft 13 that are rotatably mounted relative to each other and meshed with the first speed drive gear 31. The second-speed gear train G2 is composed of a first-speed driven gear 32. The second-speed gear train G2 allows the second-speed drive gear 33 and the countershaft 13 that are mounted on the main shaft 12 to be relatively non-rotatable while being relatively rotatable. The third speed gear train G3 is composed of a second speed driven gear 34 meshing with the speed drive gear 33, and the third speed gear train G3 cannot be rotated relative to the main shaft 12. The third-speed driven gear 36 is mounted so as to be capable of relative rotation and meshes with the third-speed drive gear 35. The fourth-speed gear train G4 cannot be rotated relative to the main shaft 12. The fourth-speed drive gear 37 and the counter-shaft 13 are mounted so as to be capable of relative rotation and are engaged with the fourth-speed drive gear 37. The fifth-speed gear train G5 includes: A fifth-speed drive gear 39 that is mounted on the main shaft 12 so as to be capable of relative rotation, and a fifth-speed driven gear 40 that meshes with the fifth-speed drive gear 39 while disabling relative rotation with the counter shaft 13. The sixth-speed gear train G6 meshes with the sixth-speed drive gear 41 while disabling relative rotation with the sixth-speed drive gear 41 and the countershaft 13 that are mounted on the main shaft 12 so as to be capable of relative rotation. And a sixth speed driven gear 42.

  Between the fifth speed drive gear 39 and the sixth speed drive gear 41, the main shaft 12 is spline-fitted with a fifth / sixth speed switching shifter 44 to enable sliding in the axial direction. The third speed drive gear 35 is formed integrally with the fifth and sixth speed switching shifter 44 so as to face the sixth speed drive gear 41, and the fourth speed drive gear 37 is the fifth speed drive gear. It is formed integrally with the fifth / sixth speed switching shifter 44 so as to oppose 39. Further, a first / fourth speed switching shifter 45 in which a fifth speed driven gear 40 is integrally formed on the countershaft 13 between the first speed driven gear 32 and the fourth speed driven gear 38 is axially provided. And a sixth-speed driven gear 42 is formed integrally with the counter shaft 13 between the second-speed driven gear 34 and the third-speed driven gear 36. The third-speed switching shifter 46 is splined to enable axial sliding.

  When the fifth / sixth speed switching shifter 44 is slid in the axial direction and engaged with the fifth speed driving gear 39, the fifth speed driving gear 39 shifts to the fifth / sixth speed switching shifter 44. The fifth gear train G5 is established by being connected to the main shaft 12 through a non-rotatable relationship. When the fifth / sixth speed switching shifter 44 is slid in the axial direction and engaged with the sixth speed driving gear 41, the sixth speed driving gear 41 is moved to the fifth / sixth speed switching shifter. The sixth gear train G6 is established by being connected to the main shaft 12 through 44 so as not to be relatively rotatable.

  When the first / fourth speed switching shifter 45 is slid in the axial direction and engaged with the first speed driven gear 32, the first speed driven gear 32 is moved to the first / fourth speed switching shifter 45. Is connected to the countershaft 13 through a non-rotatable relationship to establish a first gear train G1. When the first / fourth speed switching shifter 45 is slid in the axial direction and engaged with the fourth speed driven gear 38, the fourth speed driven gear 38 is switched to the first / fourth speed switching shifter. The fourth speed gear train G4 is established by being connected to the countershaft 13 through 45 so as not to be relatively rotatable.

  When the second / third speed switching shifter 46 is slid in the axial direction and engaged with the second speed driven gear 34, the second speed driven gear 34 is moved to the second / third speed switching shifter 46. Is connected to the countershaft 13 so as not to be relatively rotatable, and a second gear train G2 is established. When the second / third speed switching shifter 46 is slid in the axial direction and engaged with the third speed driven gear 36, the third speed driven gear 36 is moved to the second / third speed switching shifter 36. The third speed gear train G3 is established by being connected to the countershaft 13 through 46 so as not to be relatively rotatable.

  The fifth / sixth speed switching shifter 44 is rotatably held by the first shift fork 47, and the first / fourth speed switching shifter 45 is rotatably held by the second shift fork 48. The third-speed switching shifter 46 is rotatably held by a third shift fork 49, and the first shift fork 47 is supported by the engine case 11 with an axis parallel to the main shaft 12 and the counter shaft 13. The first shift fork shaft 50 is slidably supported in the axial direction, and the second and third shift forks 48 and 49 are supported by the engine case 11 with an axis parallel to the first shift fork shaft 50. The second shift fork shaft 51 is supported so as to be slidable in the axial direction.

  The engine case 11 accommodates a shift drum 52 having an axis parallel to the first and second shift fork shafts 50 and 51 and is rotatably supported. The engine case 11 has both ends of the shift drum 52 and the engine case 11. Ball bearings 58 and 59 are interposed in the front. On the outer surface of the shift drum 52, there are provided three lead grooves 53, 54 and 55 with which the first to third shift forks 47 to 49 are respectively engaged. Thus, the lead grooves 53 to 55 determine the positions of the first to third shift forks 47 to 49 on the first and second shift fork shafts 50 and 51 according to the rotational position of the shift drum 52. When the shift drum 52 rotates, the first to sixth speed gear trains G1 to G6 are selectively established according to the rotation position.

  A shift spindle 60 that is a shift drive shaft is rotatably attached to the engine case 11 so as to rotate according to a shift operation, and the shift drum 52 rotates according to the rotation of the shift spindle 60. A shift driving force transmission mechanism 61 that can be driven is provided between the shift spindle 60 and the shift drum 52, and the shift driving force transmission mechanism 61 temporarily receives the shift driving force transmitted from the shift spindle 60. A lost motion spring 62, which is a lost motion means for storing in, is interposed.

  The shift spindle 60 has an axis parallel to the shift drum 52 and is rotatably attached to the engine case 11. One end of the shift spindle 60 is linked to a change pedal (not shown). The shift lever 63 to be connected is fixed.

  Referring to FIGS. 2 and 3 together, a wall portion 11a that surrounds part of the shift spindle 60 and the shift driving force transmission mechanism 61 in the engine case 11 on one end side of the shift drum 52 in an endless manner. Are integrally provided, and a shift cover 65 for interposing an endless wall member 64A corresponding to the wall portion 11a between the wall portion 11a and a plurality of bolts 66, together with the wall member 64A. A working chamber 67 that is fastened to the wall portion 11a and accommodates a part of the shift spindle 60 and the shift driving force transmission mechanism 61 is provided between the engine case 11, the wall member 64A, and the shift cover 65. It is formed. One end of the shift spindle 60 protrudes from the shift cover 65 and is rotatably supported by the engine case 11 and the shift cover 65. Between the shift cover 65 and the shift spindle 60, there is a needle bearing 91 and the needle. A dust seal 92 disposed outside the bearing 91 is interposed. A gear cover 68 that covers a part of the shift cover 65 so as to form a gear chamber 69 between the shift cover 65 and the shift cover 65 is fastened by bolts 70 and 106B.

  4 to 7, the shift driving force transmission mechanism 61 includes a master arm 71A whose base end is fixed to the shift spindle 60, and one end of the shift drum 52 outside the engine case 11. A shift drum center 72 that is coaxially fixed to the portion, and a second transmission rotation member that is capable of rotating about an axis that is coaxial with the shift drum center 72 and that is partially disposed within the shift drum center 72 As a drum shifter 73, a pole ratchet mechanism 74 provided between the shift drum center 72 and the drum shifter 73, and a rotational force is transmitted from the master arm 71A to the shift drum center 72 coaxially from the outside. A transmission rotating member 7 which is disposed so as to face and accommodates at least a part of the drum shifter 73. With the door, lost motion spring 62 is provided between the transmission rotary member 75 and the drum shifter 73.

  The shift drum center 72 is formed in a bottomed cylindrical shape with the shift drum 52 closed, and is fixed to one end of the shift drum 52 with a coaxial shift drum bolt 76.

  Referring to FIGS. 8 and 9 together, a guide plate 77 for sandwiching the shift drum center 72 between the engine case 11 is fixed to the wall member 64A by a pair of bolts 78, 78, for example. A substantially circular opening 79 corresponding to the drum shifter 73 is provided in the guide plate 77. The drum shifter 73 is rotatably supported by a shaft portion 76 a provided coaxially with the shift drum bolt 76, and is rotatable relative to the shift drum center 72 around a coaxial axis. Is partially covered with the peripheral edge of the opening 79, so that the drum shifter 73 is prevented from being detached from the shift drum center 72.

  In FIG. 10, a pole ratchet mechanism 74 provided between the shift drum center 72 and the drum shifter 73 is mounted symmetrically on the drum shifter 73 so as to be tilted in the radial direction of the shift drum center 72, and on the upright side. A pair of spring-biased poles 81 and one of the poles 81 determined according to the rotating direction of the drum shifter 73 are provided on the inner periphery of the shift drum center 72. .., And the drum shifter 73 rotates relative to the shift drum center 72 so that one of the two poles 81 is selected as one of the engagement recesses 82. Thus, the shift drum center 72 and the shift drum 52 are rotationally driven.

  The guide plate 77 is integrally provided with a restriction projection 83 projecting inwardly from the opening 79, and one of the two poles 81... In the pole ratchet mechanism 74 is the restriction projection 83. , The drum shifter 73 and the shift drum 52 can be prevented from rotating by an unnecessarily large rotation amount during one rotation operation.

  The transmission rotation member 75 is disposed so as to be sandwiched between the master arm 71A and the guide plate 77, has an outer diameter substantially corresponding to the outer diameter of the shift drum center 72, and has one drum shifter 73. An outer cylindrical portion 75a that accommodates the shaft portion, an inner cylindrical portion 75b that allows the shaft portion 76a of the shift drum bolt 76 to pass therethrough and the inner end portion is in sliding contact with the drum shifter 73, and the outer cylindrical portion 75a and the outer cylindrical portion 75b. It has a disk-like end wall portion 75c that connects the end portions, and is formed into a bottomed double cylindrical shape that is open to the shift drum center 72 side, and can be rotated by the shaft portion 76a. Supported.

  The end wall 75c of the transmission rotation member 75 is provided with a pin 84 that protrudes on the opposite side of the guide plate 77 at a position offset from the rotation axis, that is, the axis of the shaft 76a. On the other hand, the master arm 71A is provided with a long hole-like guide hole 85 extending in the radial direction of the shift spindle 60, and a roller 86 which is in rolling contact with both side edges of the guide hole 85 is rotatable on the pin 84. It is attached to. Thus, when the master arm 71A is rotated together with the shift spindle 60, a force rotating around the axis of the shaft portion 76a is transmitted from the master arm 71A to the pin 84, that is, the transmission rotation member 75. Become.

  6 and 8, the lost motion spring 62 provided between the transmission rotation member 75 and the drum shifter 73 is provided at both ends of the coil portion 62a surrounding the outer cylindrical portion 75a of the transmission rotation member 75. Engaging portions 62b and 62c extending inside the lost motion spring 62 are provided. The outer cylindrical portion 75a is provided with a pair of insertion holes 87 and 88 through which the engaging portions 62b and 62c are inserted, and the drum shifter 73 has the engaging portions 62b and 62c. One of the engagement portions 62b of the drum shifter 73 can be engaged from one circumferential direction of the drum shifter 73, and the other of the engagement portions 62b and 62c can be engaged from the other circumferential direction of the drum shifter 73. Is provided.

  According to such a lost motion spring 62, the rotational force is transmitted to the drum shifter 73 via the lost motion spring 62 regardless of which direction the transmission rotation member 75 rotates. 52 and the shift drum center 73 are in a state where the rotation of the drum shifter 73 is constrained, the rotation of the drum shifter 73 is also constrained, so that the transmission rotation member 75 rotates with the drum shifter 73 left behind. Thus, the lost motion spring 62 temporarily stores the shift driving force transmitted from the shift spindle 60.

  Referring also to FIG. 11, in the vicinity of the shift spindle 60, the master arm 71 </ b> A is provided with a restriction hole 93 along an arc centered on the axis of the shift spindle 60. The stopper pin 94 thus inserted is inserted into the restriction hole 93. Therefore, the rotation range of the master arm 71A around the axis of the shift spindle 60 is restricted by the stopper pins 94 coming into contact with both ends of the restriction hole 93 along the circumferential direction of the shift spindle 60.

  The master arm 71A is urged to return to the original neutral position by the return spring 95. The return spring 95 has the stopper pins 94 on both ends of the coil portion 95a surrounding the shift spindle 60 from both sides. The sandwiching portions 95b and 95c are integrally connected to each other, and the master arm 71A is integrally provided with an engaging portion 71a disposed between the sandwiching portions 95b and 95c outside the stopper pin 94. Is provided.

  Thus, when the master arm 71A rotates around the axis of the shift spindle 60, the engaging portion 71a of the master arm 71A comes into contact with and engages one of the sandwiching portions 95b and 95c, and the sandwiching portions 95b and 95c. The other one of the two is brought into contact with the stopper pin 94 and is left behind so that the one pinched portion is rotated while being bent away from the stopper pin 94, and the load acting on the master arm 71A is released. Then, the master arm 71A returns to the neutral position where the engaging portion 71a is positioned outward of the stopper pin 94 by the spring force of the sandwiched portion of both the sandwiched portions 95b and 95c.

  A rod-shaped detection member 96 is coaxially connected to the shaft portion 76a of the shift drum bolt 76 so as not to be relatively rotatable. That is, a non-circular fitting recess 97 is provided coaxially at the outer end of the shaft portion 76a, and one end of the detected member 96 is fitted into the fitting recess 97 so as not to be relatively rotatable.

  The detected member 96 penetrates through a through hole 98 provided in the master arm 71A and rotatably penetrates a through hole 99 provided in the shift cover 65. The shift cover 65 and the gear cover 68 are also provided. It is supported so that it can rotate. Thus, the through hole 98 of the master arm 71A is formed long in the circumferential direction of the shift spindle 60 so that the non-detecting member 96 does not interfere with the master arm 71A when the master arm 71A rotates. The guide hole 85 and the through hole 98 are connected to each other so as to form a substantially T shape.

  On the outer surface of the gear cover 68, a sensor case of the shift position sensor 100 for obtaining the shift rotation position of the shift drum 52 by detecting the rotation amount of the detected member 96, that is, the rotation amounts of the shift drum center 72 and the shift drum 52. 105 is fastened to the gear cover 68 with a pair of bolts 106A and 106B so that a part thereof faces the gear chamber 69, and one bolt 106B is inserted into the sensor case 105 and the gear cover 68 and screwed into the shift cover 65. Combined.

  Between the detected member 96 and the shift position sensor 100, a speed reduction mechanism 101 that decelerates and transmits the rotational operation amount of the detected member 96 to the shift position sensor 100 side is provided. The gear chamber 69 is accommodated.

  Referring to FIGS. 7 and 11, the speed reduction mechanism 101 includes a drive gear 102 fixed to the detected member 96 and a sector gear 103 that meshes with the drive gear 102. As shown in FIG. 11, the sector gear 103 is provided with a pair of engagement pins 104, 104 that are offset from the rotation axis thereof, and the shift position sensor 100 includes both the engagement pins 104. , 104 has a detection unit (not shown).

  A spindle angle sensor 107 for detecting the amount of rotation of the shift spindle 60 is attached to the shift cover 65. A case 108 of the spindle angle sensor 107 is fastened to the shift cover 65 with a plurality of screw members 109. Is done.

  Thus, a pin 110 is implanted at a position offset from the shift spindle 60 of the master arm 71A, and the base end portion of the lever 111 with the tip portion engaged with the pin 110 is the spindle angle sensor 107. It is fixed to the detection shaft 112 with which is provided. Thus, when the shift spindle 60 and the master arm 71A are rotated, the detection shaft 112 is rotated according to the rotation amount, and the rotation amount of the shift spindle 60 and the master arm 71A is detected by the spindle angle sensor 107. become.

  In FIG. 12, one of the first to sixth speed gear trains G1, G2, G3, G4, G5, and G6 in the gear transmission mechanism 10 is established, and none of the gear trains G1 to G6 is established. In the neutral state, the shift positions of the shift drum 52 and the shift drum center 72 are held elastically by the shift stopper mechanism 114.

  The shift stopper mechanism 114 includes a plurality of positioning notches 115 which are provided on the outer periphery of the shift drum center 72 at positions corresponding to the plurality of set rotation positions set on the shift drum 52 and are recessed in an arc. A stopper arm 116 on which a base end portion is rotatably supported by a stopper pin 94 and a roller 117 which can be engaged with one of the positioning notches 115. The torsion spring 118 is provided between the engine case 11 and the stopper arm 116 so as to exert a spring force that urges the stopper arm 116 so that the roller 117 is in sliding contact with the outer periphery of the shift drum center 72.

  By the way, the state in which the switching operation of the established states of the first to sixth speed gear trains G1 to G6 by the action of the shift driving force temporarily stored in the lost motion spring 62 and the state in which the switching operation is blocked are described above. Switching is performed by a shift restricting mechanism 120 different from the shift stopper mechanism 114. In this embodiment, the shift restricting mechanism 120 also prevents the shift drum 52 and the shift drum center 72 from rotating.

  The shift restricting mechanism 120 is disposed on the shift drum 52 side of the lost motion spring 62 on the shift driving force transmission path by the shift driving force transmission mechanism 61 and constitutes a part of the shift driving force transmission mechanism 61. It is configured to be able to switch engagement and disengagement with the shift drum center 72 as a member, and is disposed outside the engine case 11.

  The shift restricting mechanism 120 includes a plurality of engagement recesses 121 provided on the outer periphery of the shift drum center 72 at a position shifted in the axial direction from the positioning notches 115 and one of the engagement recesses 121. One of the engagement arm 122 as an engagement member having an engagement portion 122a engageable with the support shaft 124 and rotatably supported by the support shaft 124, and the engagement recess 121a. A torsion spring 123 that is an elastic member that elastically biases the engagement arm 122 in a direction opposite to the side that engages with the torsion spring, and the engagement portion 122a against the spring force of the torsion spring 123. A rotation restricting actuator 126 that exerts a driving force to be engaged with one of the recesses 121..., And the support shaft 124 has an axis parallel to the axis of the shift drum center 72 and has the shift cover 65. And wall It is supported by the timber 64A, the torsion spring 123 surrounding the shaft 124 is provided between the shift cover 65 and the engaging arm 122.

  A connecting arm portion 122b extending to the side away from the shift drum center 72 is integrally connected to an intermediate portion of the engaging arm 122, and the rotation restricting actuator 126 is connected to the connecting arm portion 122b. The

  The rotation restricting actuator 126 is a solenoid having a rod 127 having an axis arranged in a plane perpendicular to the axis of the shift drum center 72 and the support shaft 124 and pushing the rod 127 in the axial direction when energized. Yes, and fastened to the wall member 64A by bolts 125, 125.

  The wall member 64A is formed with a storage chamber 128 adjacent to the working chamber 67, and the rod 127 is connected to the connecting arm portion 122b in the storage chamber 128. Further, a plurality of lid members 129 for closing the storage chamber 128 are fastened to the wall member 64A by a plurality of, for example, three screw members 130.

  Thus, when the rotation restricting actuator 126 is energized, the engaging portion 122 a of the engagement arm 122 is engaged with one of the engagement recesses 121 of the shift drum center 72 by the pushing force of the rotation restricting actuator 126. In this state, the rotation of the shift drum center 72 and the shift drum 52 is prevented. On the other hand, when the rotation restricting actuator 126 is not energized, the engagement arm 122 is rotated by the spring force of the torsion spring 123 so as to disengage the engagement portion 122a from the engagement recess 121, and in this state, the shift drum The center 72 and the shift drum 52 are allowed to rotate.

  In FIG. 13, the operation of the rotation regulating actuator 126 is controlled by the control unit C, and the control unit C detects the temporary storage amount of the shift driving force by the lost motion spring. The force detection means 131, the determination means 132 for determining whether or not the detection value of the accumulated energy detection means 131 exceeds a predetermined value, and the operation of the rotation restricting actuator 126 according to the determination result of the determination means 132 Actuator control means 133 for controlling the actuator control means 133, which allows the shift drum 52 to rotate in response to the determination means 132 determining that the detected value exceeds the predetermined value. Then, the rotation restricting actuator 126 is turned off so that the engagement arm 122 rotates.

  The power accumulation amount detection means 131 includes a detection value of the shift position sensor 100 that detects the rotation amounts of the shift drum center 72 and the shift drum 52 and a detection value of the spindle angle sensor 107 that detects the rotation amount of the shift spindle 60. Entered. In other words, when the shift spindle 60 is rotated while the rotation of the shift drum center 72 is restricted, the lost motion spring 62 causes the transmission rotation member 75 to rotate relative to the drum shifter 73 and shift operation force. Therefore, by subtracting the detection value of the shift position sensor 100 from the detection value of the spindle angle sensor 107, the amount of stored force by the lost motion spring 62 corresponding to the relative rotation amount of the transmission rotation member 75 with respect to the drum shifter 73. Is detected by the accumulated amount detecting means 131.

  Next, the operation of the first embodiment will be described. The state in which one of the first to sixth gear trains G1 to G6 included in the gear transmission mechanism 10 is established and none of the gear trains G1 to G6 is non-existent. The rotation position of the shift drum 52 in the neutral state that is established is resiliently held by the shift stopper mechanism 114, but prevents the shift drum 52 from rotating separately from the shift stopper mechanism 114. The state and the state permitting the rotation of the shift drum 52 are switched by the shift restricting mechanism 120, and the shift restricting mechanism 120 is moved from the lost motion spring 62 on the shift driving force transmission path by the shift driving force transmitting mechanism 61. Is also disposed on the shift drum 52 side and engaged with the shift drum center 72 constituting a part of the shift driving force transmission mechanism 61 and It is configured so as to switch the disengagement.

  Therefore, the shift restricting mechanism 120 prevents the shift drum 52 from rotating until the lost motion spring 62 accumulates sufficient force to rotate the shift drum 52, and the shift restricting mechanism 120 causes the shift drum 52 to move as necessary. Since the rotation prevention state can be released, the operation of the lost motion spring 62 improves the feeling of the speed change operation, and the speed change operation is reliably performed at a predetermined timing regardless of variations in the lost amount due to the lost motion spring 62. It can be carried out.

  The shift drum center 72 is coaxially fixed to the shift drum 52 outside the engine case 11 that houses the shift drum 52, and the shift restricting mechanism 120 that switches engagement and disengagement with the shift drum center 72 is provided in the engine case 11. Therefore, the shift restriction mechanism 120 can be easily maintained.

  Further, since the operation of the rotation restricting actuator 126 provided in the shift restricting mechanism 120 is controlled by the actuator control means 133, the rotation restricting of the shift drum 52 by the shift restricting mechanism 120 and the release thereof can be switched at an appropriate timing. .

  In addition, a clutch 14 that operates so as to switch between power transmission and disengagement by the clutch actuator 30 is provided between the crankshaft of the engine, which is the power source output shaft, and the main shaft 12 of the gear transmission mechanism 10. A temporary stored amount of shift driving force by the spring 62 is detected by the stored power amount detecting means 131, and it is determined by the determining means 132 whether or not the detected value of the stored power amount detecting means 131 exceeds a predetermined value. In response to the determination unit 132 determining that the detection value of the detection unit 131 exceeds the predetermined value, the actuator control unit 133 causes the shift regulating mechanism 120 to operate on the side that allows the shift drum 52 to rotate. Since the rotation restricting actuator 126 is controlled by the shift restricting mechanism 120 at a suitable timing, Beam of rotation preventing and so as to switch the release thereof, it is possible to reliably perform a shift operation at a predetermined timing that matches the power transmission interrupting operation of the clutch 14 is started.

  The shift driving force transmission mechanism 61 has a transmission rotation member 75 provided on the shift drive shaft 60 side on the transmission path by the shift driving force transmission mechanism 61, and shifts more than the transmission rotation member 75 on the transmission path. A drum shifter 73 that is provided on the drum 52 side and has a lost motion spring 62 interposed between the drum 52 and the transmission rotation member 75, and an operation chamber 67 that houses the shift driving force transmission mechanism 61 includes an engine case 11, Since the shift cover 65 and the wall member 64A sandwiched between the engine case 11 and the shift cover 65 are formed, the shift driving force transmission mechanism 61 is shifted by the amount of the lost motion mechanism including the lost motion spring 62. As the drum 52 increases in size in the axial direction, a wall member 64A is sandwiched between the engine case 11 and the shift cover 65. Thus, it is possible to secure a space in which the shift driving force transmission mechanism 61 is disposed, and it is possible to cope with the transmission without the lost motion mechanism by removing the wall member 64A. Even if the lost motion mechanism including the spring 62 is provided, cases such as the dedicated engine case 11 and the dedicated shift cover 65 can be made unnecessary.

  A shift drum center 72 fixed coaxially to one end of the shift drum 52 outside the engine case 11 is sandwiched between the engine case 11 and a drum shifter 73 partially disposed in the shift drum center 72. Since the guide plate 77 that prevents the shift drum center 72 from being detached has a restricting projection 83 that restricts excessive rotation of the shift drum 52 and is attached to the wall member 64A, the guide plate 77 is attached to the guide plate 77. It is not necessary to process the engine case 11 side.

  Moreover, since the transmission rotation member 75 is sandwiched between the guide plate 77 and the master arm 71A fixed to the shift spindle 60, the width of the shift driving force transmission mechanism 61 in the axial direction of the shift drum 52 is minimized. The wall member 64A can be made thin, which can contribute to weight reduction.

  Further, a transmission rotation member 75 that constitutes a part of the shift driving force transmission mechanism 61 is arranged coaxially with the shift drum 52 so as to rotate in conjunction with the rotation of the shift spindle 60, and the shift driving force transmission mechanism. At least a part of a drum shifter 73 that constitutes a part of 61 and is arranged coaxially with the shift drum 60 is accommodated in the transmission rotation member 75, surrounds the transmission rotation member 75, is formed in a coil shape, and is transmitted Engaging portions 62b and 62c extending inside the lost motion spring 62 are provided at both ends of the lost motion spring 62 to which the rotational force is transmitted from the rotating member 75, and the drum shifter 73 has both engaging portions 62b and 62c. One end 62 b can be engaged from one side in the circumferential direction of the drum shifter 73, and the other end 62 c of both engaging portions 62 b and 62 c is And the locking portion 90 that can engage the direction the other is provided.

  Therefore, it is necessary to secure a space for engaging both ends of the lost motion spring 62 with the transmission rotating member constituting a part of the shift driving force transmission mechanism outside the coil-shaped lost motion spring 62 in the radial direction. In addition, the space for disposing the lost motion mechanism including the lost motion spring 62 can be reduced, the wall member 64A can be made thinner, and the transmission can be further miniaturized.

  The transmission rotation member 75 has an outer cylindrical portion 75 a that covers at least a part of the drum shifter 73 and is arranged coaxially with the shift drum 52, and the both engagements of the lost motion spring 62 with the outer cylindrical portion 75 a. Since the pair of insertion holes 87 and 88 through which the parts 62b and 62c are inserted extend in the circumferential direction, a mechanism for transmitting the rotational force from the transmission rotation member 75 to the lost motion spring 62 is configured simply and compactly. It becomes possible.

  Further, a plurality of engagement recesses 121 are provided on the outer periphery of the shift drum center 72, and the shift restricting mechanism 120 can engage with one of the engagement recesses 121, and the engagement arm 122. A torsion spring 123 that urges the engagement with the engagement recess 121 toward the unlocking side, and a drive that engages the engagement portion 122a with one of the engagement recesses 121 against the spring force of the torsion spring 123. The rotation restricting actuator 126 that exerts a force is provided, so that the rotation of the shift drum 52 is not restricted when the rotation restricting actuator 126 is not energized, and the shift drum 52 can be freely moved. It can be rotated.

  FIG. 14 shows a second embodiment of the present invention and is a cross-sectional view corresponding to FIG. 5 of the first embodiment.

  In the second embodiment, the same reference numerals are assigned to the portions corresponding to the first embodiment and the detailed description is omitted.

  The shift restricting mechanism 136 includes a plurality of engagement recesses 121 provided on the outer periphery of the shift drum center 72 and an engagement portion 122a that can be engaged with one of the engagement recesses 121, and the support shaft 124. The engaging arm 122 as an engaging member that is pivotally supported by the actuator, and the engaging arm 122 is elastically biased toward the side where the engaging portion 122a is engaged with one of the engaging recesses 121. The torsion spring 123, which is an elastic member, and the master arm 71B.

  A pair of contact inclined surfaces 135 and 135 located on both sides of the engagement portion 122a of the engagement arm 122 are provided at the distal end portion of the master arm 71B whose base end portion is fixed to the shift spindle 60. The two contact inclined surfaces 135... Are inclined so as to be separated from the engaging portion 122 a as they are separated from the shift spindle 60.

  According to such a shape of the master arm 71B, when the shift spindle 60 and the master arm 71B are rotated by a predetermined rotation amount, one of the both contact inclined surfaces 135 is engaged with the engagement recess 121. When the shift spindle 60 and the master arm 71B are further rotated by coming into contact with the engagement portion 122a, the engagement arm 122 is rotationally driven so that the engagement portion 122a is detached from the engagement recess 121. .

  That is, the engagement portion 122a is inserted into one of the engagement recesses 121 so that the shift drum 52 (see the first embodiment) is prevented from rotating by the rotation of the shift spindle 60 and the master arm 71B exceeding a predetermined rotation amount. The engagement arm 122 engaged with the shift drum 52 is automatically operated by the master arm 71B so as to allow the shift drum 52 to rotate. The actuator 126 becomes unnecessary.

  In addition, since the engagement arm 122 of the shift restricting mechanism 136 is elastically biased toward the side of engagement with one of the engagement recesses 121 by the torsion spring 123, in the state where the master arm 71 is in the neutral position, the solenoid The shift drum 52 can be mechanically blocked without using an actuator such as a motor or an electric motor.

  FIG. 15 shows a third embodiment of the present invention and is a cross-sectional view corresponding to FIG. 6 of the first embodiment.

  Also in the third embodiment, the same reference numerals are assigned to the portions corresponding to the first embodiment and the detailed description is omitted.

  Although the stopper arm 116 in the shift stopper mechanism 114 is rotatably supported by the stopper pin 94, the state in which the shift drum 52 is prevented from rotating and the shift drum 52 is allowed to rotate separately from the shift stopper mechanism 114. The state to be switched is switched by the shift restriction mechanism 140.

  Thus, the shift restricting mechanism 140 exhibits a spring force that urges the stopper arm 116 so that the stopper arm 116 and the roller 117 pivotally supported by the stopper arm 116 are in sliding contact with the outer periphery of the shift drum center 72. Thus, the torsion spring 118 provided between the engine case 11 and the stopper arm 116 is a component common to the shift stopper mechanism 114. In addition to these components, the stopper arm 116 is The sub-shift stopper arm 141 is rotatably supported on the stopper pin 94 so as to partially overlap the stopper arm 116 in the axial direction of the stopper pin 94 that is rotatably supported, and the shift drum center 72 is engaged. Sub-shift stopper on the side where the stopper arm 116 is rotated on the mating side A coil spring 142 which biases the over arm 141, and a rotation restricting actuator 147.

  That is, in this shift regulating mechanism 140, the positioning notches 115 for engaging the roller 117 of the stopper arm 116 function as an engaging recess for engaging the engaging member, and the stopper arm 116 functions as the engaging member. The coil spring 142 functions as an elastic member.

  A protruding portion 116a protruding in the opposite direction to the roller 117 is integrally provided at the base end portion of the stopper arm 116, and the protruding portion 116a is formed on the sub-shift stopper arm 141 in the clockwise direction of FIG. A pressing protrusion 141a that is in contact with the arm is integrally provided, and one end of the pressing rod 143 urged by the coil spring 142 rotates at one end of the sub-shift stopper arm 141 in the clockwise direction of FIG. It abuts so as to be urged. That is, when the stopper arm 116 is pressed in the clockwise direction in FIG. 15 by the sub-shift stopper arm 141, the roller 117 is not only caused by the spring force of the torsion spring 118 but also by the spring force of the coil spring 142. The shift drum 52 is prevented from rotating in this state.

  The wall member 64B that forms part of the working chamber 67 ′ that houses the shift driving force transmission mechanism 61 has a sliding hole 144 in which the pressing rod 143 is slidably fitted, and the other end of the pressing rod 143. An accommodating hole 145 that is coaxially connected to the sliding hole 144 is provided by movably accommodating the flange portion 143a provided on the side, and the outer end of the accommodating hole 145 is hermetically closed so as to be closed in the accommodating hole 145 The coil spring 142 is contracted between the lid member 146 to be fitted and fixed and the flange portion 143a.

  Further, a rotation restricting actuator 147 is provided on the wall member 64B, and this rotation restricting actuator 147 is a sub-shift stopper in a direction opposite to the urging direction by the pressing rod 143, that is, counterclockwise in FIG. A plunger 148 is provided that can abut one end against the other end of the sub-shift stopper arm 141 so as to rotate the arm 141.

  The wall member 64B is provided with a cylinder hole 149 in which the plunger 148 is slidably fitted, and the outer end of the cylinder hole 149 is fitted in the outer end of the cylinder hole 149 so as to be hermetically closed. A hydraulic chamber 151 is formed between the fixed lid member 150 and the plunger 148. By applying hydraulic pressure to the hydraulic chamber 151, the plunger 148 moves the sub-shift stopper arm 141 counterclockwise in FIG. It will be operated to rotate.

  According to such a rotation regulating actuator 147, when the shift drum 52 is prevented from rotating, it is sufficient that the hydraulic pressure is not applied to the hydraulic chamber 151, and the sub-shift stopper is caused by the spring force exerted by the coil spring 142. The arm 141 presses the stopper arm 116 to the side where the roller 117 is fitted into the positioning notch 115. Further, when the rotation of the shift drum 52 is allowed, it is only necessary to apply hydraulic pressure to the hydraulic chamber 151, and the sub shift stopper arm 141 rotates to the side where the pressing protrusion 141a is separated from the protrusion 116a. The roller 116 can be rotated so as to separate the roller 117 from the positioning notch 115, and the rotation of the shift drum 52 is allowed.

  The third embodiment can achieve the same effects as those of the second embodiment.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. It is.

  For example, in the above embodiment, a description has been given of a vehicle transmission device in which the shift spindle 60 is rotated in response to a shift operation by human power. However, a vehicle in which a shift drive shaft is rotationally driven by an actuator such as an electric motor. The present invention can also be applied to other transmissions.

1 is a longitudinal sectional view of an essential part of a motorcycle transmission according to a first embodiment. 2 enlarged view of FIG. 3-3 sectional view of FIG. A perspective view with the shift cover and gear cover removed from FIG. Sectional view along line 5-5 in FIG. 6-6 sectional view of FIG. Sectional view along line 7-7 in FIG. The perspective view which shows a part of shift drive force transmission mechanism in the state by which the transmission rotation member was cut The perspective view corresponding to FIG. 8 in the state which removed the transmission rotation member and the lost motion spring Sectional view taken along line 10-10 in FIG. Sectional view taken along line 11-11 in FIG. 12-12 sectional view of FIG. Block diagram showing a control system for controlling the operation of the shift regulating mechanism Sectional view showing the second embodiment and corresponding to FIG. 5 of the first embodiment Sectional view showing the third embodiment and corresponding to FIG. 6 of the first embodiment

DESCRIPTION OF SYMBOLS 10 ... Gear transmission mechanism 11 ... Engine case 12 ... Main shaft 13 which is a shift input shaft ... Counter shaft 52 which is a shift output shaft ... Shift drum 60 ... A shift drive shaft Shift spindle 61... Shift drive force transmission mechanism 62... Lost motion springs 62 b and 62 c... Engagement portions 64 A and 64 B. 73... Drum shifter 75 as a second transmission rotating member... Transmission rotating member 77 as a first transmission rotating member... Guide plate 83. Locking part G1, G2, G3, G4, G5, G6 ... Gear train

Claims (2)

A gear transmission mechanism (10) in which a gear train (G1, G2, G3, G4, G5, G6) that can be selectively established is provided between a transmission input shaft (12) and a transmission output shaft (13). ), A shift drum (52) rotatably supported on the engine case (11) so as to selectively establish the gear train (G1 to G6) according to the rotation position, and according to the shift operation. And a shift drive shaft (60) rotatably attached to the engine case (11) so that the shift drum (52) is rotated according to the rotation of the shift drive shaft (60). The shift drive force transmission mechanism (61) provided between the shift drive shaft (60) and the shift drum (52) to enable driving, and the shift drive force transmitted from the shift drive shaft (60) are temporarily provided. I will accumulate In transmission of a vehicle including the lost and motion spring (62) which is interposed the shift drive force transmitting mechanism (61) in the,
The shift driving force transmission mechanism (61) includes a first transmission rotation member (75) provided on the shift driving shaft (60) side on the transmission path by the shift driving force transmission mechanism (61), and the transmission. The lost motion spring (62) is interposed between the first transmission rotation member (75) and the first transmission rotation member (75). A second transmission rotating member (73) to be operated,
More gear stages of the gear train (G1 to G6) wall member to said engine case is accommodated (11) (64A, 64B) shift cover via (65) is coupled Rutotomoni, the shift drive force transmitting mechanism (61) is formed between the engine case (11), the wall members (64A, 64B) and the shift cover (65) .
A guide plate (77) having a restricting protrusion (83) that restricts the shift drum (52) from rotating too much during one rotation operation is attached to the wall member (64A, 64B). transmission equipment of a vehicle, characterized. A first transmission rotation member (75) is arranged coaxially with the shift drum (52) so as to rotate in conjunction with the rotation of the shift drive shaft (60), and the shift drum (52) At least a portion of the second transmission rotation member (73) disposed coaxially with the first transmission rotation member (75), surrounding the first transmission rotation member (75) and coiling Engaging portions (62b, extending inward of the lost motion spring (62) at both ends of the lost motion spring (62) that are formed in a shape and to which rotational force is transmitted from the first transmission rotating member (75). 62c) is provided, and one of the engaging portions (62b, 62c) is engaged with the second transmission rotation member (73) from one circumferential direction of the second transmission rotation member (73). Locking part (89) to be obtained, and both engaging parts (62b, 62c) Engaging portion that can engage the other circumferential of the other second transmission rotary member (73) (90) and transmission apparatus for a vehicle according to claim 1, characterized in that is provided.

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