JP2013194859A - Gear change device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid occurrence of delay in torque transmission during a gear change and to perform a smooth gear change.SOLUTION: As a part of lock protruding parts 31, 31a; 32, 32a; 33, 33a; 34, 34a; 35, 35a, the specific lock protruding parts 31a, 32a, 33a, 34a, 35a are formed shorter than the remaining lock protruding parts 31, 32, 33, 34, 35, such that at least one of both ends of the specific lock protruding part 31a, 32a, 33a, 34a, 35a along an axial direction of a gear support part is disposed closer to the center along the axial direction than at least one of both ends of the remaining lock protruding parts 31, 32, 33, 34, 35 along the axial direction.

Description

  In the present invention, a gear train having a plurality of shift stages is provided between an input shaft and an output shaft that are parallel to each other, and a cylindrical gear support is coaxially provided on one of the input shaft and the output shaft. A plurality of gear trains, each of which is arranged on the inner circumference of a gear that is rotatably supported by the gear support portion and spaced apart in the circumferential direction and extends in the axial direction of the gear. An engaging arm portion that is provided with an individual locking projection and that can be moved in the axial direction with respect to the gear support portion and can be engaged with the locking projection by an engagement member that cannot be relatively rotated. The present invention relates to a transmission in which is provided.

  A plurality of locking projections are provided on the inner periphery of the gear that is rotatably supported by a gear support unit integrated with the output shaft, and a cross-shaped engagement that selectively engages the locking projections. An engagement member having an arm portion is inserted into the gear support portion so as to be axially movable and relatively non-rotatable, and one of a plurality of gears is driven to the gear support portion, that is, an output by driving the engagement member in the axial direction. A transmission that is connected to a shaft so as not to be relatively rotatable is known from Patent Document 1.

Japanese Patent No. 4554234

  By the way, if the interval between the locking projections provided on the inner periphery of the gear supported by the gear support portion is too larger than the width of the engaging arm portion of the engaging member, the engaging arm portion is set to 1 It takes time for the gears to engage with the locking projections of the two gears and the torque transmission state in which the gears rotate together with the output shaft takes a long time. It is desirable that the interval between the parts is set as small as possible according to the width of the engaging arm part. However, if the interval between the locking projections is small, the engagement arm portion easily comes into contact with the locking projection when the engagement member is moved, and the engagement arm portion is difficult to enter between the locking projections and is smooth. Therefore, there is a problem that it is difficult to perform a speed change, and there is a demand for development of a technique that does not cause a delay in torque transmission during the speed change and that enables a smooth speed change.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a transmission that avoids a delay in torque transmission during a shift and enables a smooth shift.

  In order to achieve the above object, according to the present invention, a gear train having a plurality of speed stages is provided between an input shaft and an output shaft that are parallel to each other, and a cylindrical gear support portion is provided on one of the input shaft and the output shaft. It is provided coaxially and is arranged at a position spaced apart in the circumferential direction on the inner circumference of a gear that constitutes a part of each of the gear trains of a plurality of shift stages and is rotatably supported on the gear support portion. A plurality of locking projections extending in the axial direction of the gear are provided, respectively, and an engagement member that enables axial movement relative to the gear support and disables relative rotation is provided on the locking projection. In the transmission provided with the engaging arm portion that can be engaged, the specific locking projection that is a part of the locking projection is the specific locking projection along the axial direction of the gear support portion. The axial direction of the remaining locking projection at least one of the ends of the portion Be arranged close to the center along at least the axial direction from one end of both ends along the, the first being formed shorter than the remaining locking projection.

  Further, according to the present invention, in addition to the configuration of the first feature, the engagement member has a plurality of the engagement arm portions at equal intervals in the circumferential direction, and the specific locking protrusion is the engagement arm portion. A second feature is that the plurality of gears are provided on the inner circumference of the plurality of gears in a number and a circumferential relative arrangement corresponding to the number and the circumferential relative position.

  In the present invention, in addition to the configuration of the second feature, the specific locking protrusions and the remaining locking protrusions are alternately arranged in the circumferential direction on the inner periphery of the plurality of gears. This is the third feature.

  According to the present invention, in addition to any one of the first to third features, a gear train of the highest gear stage is disposed at one end portion along the axial direction of the gear support portion, and the gear train of the highest gear stage. In the inner periphery of the gear that constitutes a part of the gear train except the gear support and is rotatably supported by the gear support portion, both ends along the axial direction of the specific locking protrusion are the remaining engagement. A fourth feature is that the stop protrusion is disposed closer to the center along the axial direction than both ends along the axial direction.

  In the present invention, in addition to any one of the first to fourth features, at least one of both end portions along the axial direction of the specific locking projection gradually increases in width along the rotation direction of the gear. A fifth feature is that the taper is formed to be thinner.

  In addition to any of the configurations of the first to fifth features, the present invention is arranged with at least one end along the axial direction of the remaining locking projection, and at least one end closer to the center along the axial direction. A sixth feature is that a distance between at least one end of the specific locking projection is set differently for each of the gear trains of a plurality of shift stages.

  In addition to the configuration of the sixth feature, the seventh feature of the present invention is that the distance is set longer as the number of rotations of the gear provided with the specific locking projection increases.

  Further, the present invention provides, in addition to the configuration of the fourth feature, an internal gear for a maximum gear that constitutes a part of a gear train of the maximum gear that is disposed at one end portion along the axial direction of the gear support. On the circumference, on the opposite side to the other gear adjacent to the highest gear, the end of the specific locking projection is located at the same position in the axial direction as the end of the remaining locking projection. This is an eighth feature.

  The fifth-speed driven gear 29 of the embodiment corresponds to the highest gear stage gear of the present invention, and the fifth-speed gear train G5 of the embodiment corresponds to the highest gear stage of the present invention.

  According to the first feature of the present invention, the specific locking that is a part of the locking protrusions provided on the inner periphery of the plurality of gears that are rotatably supported on the gear support portion. Since at least one end of the protrusion is arranged closer to the center along the axial direction of the gear support part than at least one end of the remaining locking protrusions, a plurality of locking protrusions including a specific locking protrusion are between each other. Even if the interval is set small, the engagement arm portion of the engagement member only needs to enter the interval between the locking projections that sandwich the specific locking projection from both sides in the part where the specific locking projection exists. The engagement arm portion is more likely to enter between the locking projections, and after entering, the engagement arm portion can be engaged with the locking projection including the specific locking projection. The engagement with the locking projection is not delayed, and a delay in torque transmission during shifting is avoided and a smooth shifting is possible.

  According to the second feature of the present invention, the number of specific locking projections and the circumferential relative arrangement are determined corresponding to the number of engaging arm portions of the engaging member and the circumferential relative position. Even if the engaging member has a plurality of engaging arm portions, all the engaging arm portions easily enter the inner peripheral side of the gear to be engaged at a position corresponding to the specific locking projection.

  According to the third feature of the present invention, since the specific locking projections and the remaining locking projections are alternately arranged in the circumferential direction, the intervals at which the specific locking projections are arranged, etc. It is possible to perform smooth shift switching by setting the intervals to be equal to the timing at which the engagement arm portion enters the gear to be engaged in the acceleration / deceleration state.

  According to the fourth feature of the present invention, in the gear train excluding the gear train of the highest gear, the both ends in the axial direction of the specific locking projection are in the axial direction than the axial ends of the remaining locking projection. Since it is arranged closer to the center along the line, it is possible to easily shift the engagement arm portion into the inner periphery of the gear to be engaged by either shifting up or shifting down, thereby enabling smooth gear shifting.

  According to the fifth feature of the present invention, since the width along the rotational direction is gradually narrowed at least one of the axial end portions of the specific locking projection, the engagement is performed on the side where the width along the rotational direction is reduced. The area where the arm portion hits the specific locking projection is reduced, and the engagement arm portion can be smoothly engaged with the specific locking projection.

  According to the sixth aspect of the present invention, the distance between at least one end of the remaining locking projections along the axial direction and at least one end of the specific locking projections is different for each gear train of a plurality of shift stages. Therefore, the ease of entering the engagement arm portion according to the number of rotations can be adjusted in consideration of the difference in the number of rotations between the plurality of gears supported by the gear support unit, and the reliability of the shift switching can be improved. Can be increased.

  According to the seventh feature of the present invention, the distance from one end of the remaining locking projection to one end of the specific locking projection increases as the rotational speed of the gear provided with the specific locking projection increases. Therefore, the specific locking protrusion of the low-speed gear, which requires strength due to the large driving torque, is lengthened in the axial direction of the gear support portion to ensure the strength, while the driving torque is small, so Compared with a high-speed gear having a lower required strength, the ease of fitting the engagement arm portion can be increased.

  Further, according to the eighth aspect of the present invention, in the highest gear stage gear, the gear is disposed at one end portion along the axial direction of the gear support portion, so that it is different from the other gear adjacent to the highest gear stage gear. On the opposite side, it is not necessary to consider the ease of fitting of the engaging arm portion, so on the opposite side to the other gears, the end of the specific locking projection is connected to the end of the remaining locking projection and the shaft. It can contribute to the rigidity improvement of a specific latching protrusion by arrange | positioning in the same position by a direction.

It is a partially cutaway front view showing the internal combustion engine of the first embodiment in a state where a fifth speed gear train is established. FIG. 2 is a sectional view taken along line 2-2 of FIG. 1 in a state where none of the first to fifth gear trains has been established. FIG. 3 is a sectional view taken along line 3-3 in FIG. 1. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. It is sectional drawing corresponding to FIG. 4 of 2nd Embodiment. It is sectional drawing corresponding to FIG. 4 of 3rd Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  The first embodiment of the present invention will be described with reference to FIGS. 1 to 4. First, in FIG. 1, an engine body 11 of the internal combustion engine is mounted on, for example, a motorcycle. A crankshaft 14 having an axis extending in the vehicle width direction is rotatably supported by a crankcase 12 constituting a part of the cylinder 11, and a cylinder body constituting a part of the engine body 11 is supported on the crankshaft 14. A piston 15 slidably fitted to 13 is connected.

  Referring also to FIG. 2, a transmission 16 is accommodated in the crankcase 12, and the transmission 16 receives an input shaft to which rotational power from the crankshaft 14 is input via a clutch 17. 18, an output shaft 19 connected to a drive wheel (not shown), and a gear train of a plurality of shift stages provided between the input shaft 18 and the output shaft 19 that can be selectively established, for example, first to fifth gears The input shaft 18 and the output shaft 19 have an axis parallel to the crankshaft 14 and are rotatably supported by the crankcase 12. .

  The first to fifth speed gear trains G1, G2, G3, G4, and G5 have first to fifth speed drive gears 20, 21, 22, 23, 24 to which rotational power is transmitted from the input shaft 18, and It comprises first to fifth speed driven gears 25, 26, 27, 28, 29 that are individually meshed with the first to fifth speed driving gears 20 to 24 and can transmit rotational power to the output shaft 19. The first speed gear train G1, the second speed gear train G2, the third speed gear train G3, the fourth speed gear train G4 and the fifth speed gear train G5 are arranged in this order from the clutch 17 side.

  One of the input shaft 18 and the output shaft 19, in this embodiment, the output shaft 19 is provided with a cylindrical gear support 19 a coaxially, and part of the first to fifth gear trains G 1 to G 5. The first to fifth speed driven gears 25 to 29 are respectively rotatably supported by the gear support portion 19a, and the first to fifth speed driving gears 20 to 24 are fixed to the input shaft 18. The

  Referring to FIGS. 3 and 4 together, a plurality of third-speed driven gears 27 are arranged on the inner periphery of the third-speed driven gear 27 at intervals in the circumferential direction and extend in the axial direction of the third-speed driven gear 27. .. Are provided, and a specific locking projection 33a, which is a part of the locking projections 33, 33a, is a shaft of the gear support 19a. At least one end of both ends of the specific locking projection 33a along the direction is arranged closer to the center along the axial direction than at least one end of the remaining locking projection 33 along the axial direction. Thus, it is formed shorter than the remaining locking projections 33.

  Like the third-speed driven gear 27, the inner periphery of the first, second, fourth, and fifth-speed driven gears 25, 26, 28, and 29 is arranged at a position spaced in the circumferential direction. A plurality of locking protrusions 31 ..., 31a ...; 32 ..., 32a ...; 34 ..., extending in the axial direction of the first, second, fourth and fifth speed driven protrusions 25, 26, 28, 29. 34a ...; 35 ..., 35a ... are provided, and the locking projections 31 ..., 31a ...; 32 ..., 32a ...; 34 ..., 34a ...; The locking projections 31a ..., 32a ..., 34a ..., 35a ... are at least of both ends of the specific locking projections 31a ..., 32a ..., 34a ..., 35a ... along the axial direction of the gear support 19a. One end of the remaining locking projections 31, 32, 34, 35, 35. Be arranged close to the center along the axial direction from one end, the remaining of the locking projection 31 ..., 32 ..., 34 ..., 35 ... are formed shorter than the.

  Moreover, both ends along the axial direction of the specific locking projections 31a, ..., 32a, ..., 34a ... provided on the inner circumference of the first to fourth driven gears 25 to 28 are the remaining locking. .., 33... Are arranged closer to the center along the axial direction than both ends along the axial direction.

  On the other hand, at the inner periphery of the fifth gear driven gear 29 of the highest gear stage, that is, the fifth gear train G5, arranged at one end portion along the axial direction of the gear support portion 19a, the fourth gear driven gear is provided. On the 34th side, one end of the specific locking projection 35a is disposed closer to the center along the axial direction than the other end of the remaining locking projection 35, but the fourth speed driven gear 28 is provided. On the opposite side, the end portions of the specific locking projections 35a are arranged at the same position in the axial direction as the end portions of the remaining locking projections 35.

  The locking projections 31 ..., 31a ...; 32 ..., 32a ...; 33 ..., 33a ...; 34 ..., 34a ...; 35 ..., 35a ... on the inner periphery of the first to fifth driven gears 25-29. Are capable of engaging with engaging arm portions 36b, 36b,... Provided on the engaging member 36 that can move in the axial direction with respect to the gear support portion 19a and cannot rotate relative to the gear supporting portion 19a. Is integrally formed with a base portion 36a that is inserted into the gear support portion 19a so as to be movable in the axial direction, and a plurality of, for example, four engaging arm portions 36b, 36b that extend radially outward from the base portion 36a. The engaging arm portions 36b, 36b,... Are arranged so as to extend radially outward from a circumferentially spaced position on the outer periphery of the base portion 36a, and the entire engaging member 36 has a cross shape. Formed.

  On the other hand, the gear support portion 19a is provided with four slits 37, 37... Extending in the axial direction, and the engagement arm portions 36b, 36b,. As a result, the engagement member 36 cannot be rotated relative to the gear support portion 19a, and can move in the axial direction. Thus, the front ends of the engaging arm portions 36b, 36b,... Projecting from the outer periphery of the gear support portion 19a are the locking projections 31 ... on the inner periphery of the first to fifth speed driven gears 25-29. 32a, 32a ...; 33 ..., 33a ...; 34 ..., 34a ...; 35 ..., 35a ... are engageable.

  In addition, a region A1 in which the locking projections 31 are provided on the inner periphery of the first speed driven gear 25 arranged at the other end portion along the axial direction of the gear support portion 19a, and the region A1. An area A2 in which the locking projections 31..., 31a... Are not provided so as to sandwich A1 between the second speed driven gear 26 and the locking projections 31. When the engagement member 36 moves to the non-region A2 as shown in FIG. 2, the engagement member 36 is not engaged with the first speed driven gear 27, and the first to fifth speed gears are not engaged. A neutral state in which none of the columns G1 to G5 is established is obtained.

  In addition, the specific locking protrusions 31a, ..., 32a, ..., 34a, ..., 35a in the first to fifth driven gears 25 to 29 are a plurality of which the engaging member 36 has at equal intervals in the circumferential direction. Are provided on the inner circumference of the first to fifth speed driven gears 25 to 29 in a number and a circumferential relative arrangement corresponding to the number of the engagement arm portions 36b, 36b. In this embodiment, the four engaging arm portions 36b, 36b... Of the engaging member 36 are arranged at equal intervals in the circumferential direction, and the specific locking protrusions are provided in the first to fifth driven gears 25 to 29. The portions 31a ..., 32a ..., 33a ..., 34a ..., 35a ... and the remaining locking projections 31 ..., 32 ..., 33 ..., 34 ..., 35 ... are alternately arranged in the circumferential direction.

  1 and 2, a guide pipe 38 is inserted into the gear support portion 19 a from the opening end side, and a flange portion 39 a sandwiching the guide pipe 38 with the base portion 36 a of the engagement member 36. And a male screw 40 is provided on the outer periphery of the other end of the connecting shaft 39 inserted into the guide pipe 38. The engaging member 36 is connected to the base portion 36a by screwing the male screw 40 into the base portion 36a. The shaft 39 is fixedly connected.

  The crankcase 12 is provided with a cover 42 that forms an operating chamber 41 facing the one end opening of the gear support portion 19a between the crankcase 12 and a shift change. The mechanism 43 is accommodated.

  The shift change mechanism 43 includes a rotation shaft 45 rotatably supported by the cover 42, an arm 46 fixed to the rotation shaft 45, and the rotation at a position separated from the arm 46 in the axial direction. A ratchet 47 fixed to the moving shaft 45, a shift plate 48 disposed between the arm 46 and the ratchet 47 and supported so as to be relatively rotatable on the rotating shaft 45, the cover 42 and the shift plate 48 A return spring 49 provided therebetween, up-side and down-side claw members 50 and 51 that can be engaged with the ratchet 47 and are rotatably supported by the shift plate 48, the shift plate 48 and the up-side claw Up-side and down-side torsion springs 5 provided between the member 50 and the shift plate 48 and the down-side claw member 51, respectively. , And a 53.

  A locking piece 55 that engages with an annular locking groove 54 provided at one end of the connecting shaft 39 is supported at one end of the arm 46 whose longitudinal intermediate portion is fixed to the rotating shaft 45. The The other end of the arm 46 is formed in a fan shape, and a click mechanism 56 is provided between the other end of the arm 46 and the cover 42.

  The click mechanism 56 includes a plurality of recesses 57, 57... Provided in the outer periphery of the other end of the arm 46 in a number corresponding to the number of shift stages in the transmission 16 and one of the recesses 57, 57. A housing 58 that is configured to include a ball 58 that selectively engages and a spring 59 that biases the ball 58 toward the arm 46, and that is provided in the cover 42 so that the outer end opening is closed by a lid member 69. A part of the ball 58 is accommodated in the hole 60, and the spring 59 accommodated in the accommodation hole 60 is provided between the ball 58 and the lid member 69.

  An opening 61 is provided at one end of the shift plate 48, and a stopper pin 62 positioned in the opening 61 is implanted in the cover 42, and the shift plate 48 includes the opening 61. Engagement protrusions 63 formed by bending a part of the periphery are provided. The return spring 49 is a torsion coil spring having a pair of sandwiching pieces 49a and 49b sandwiching the engaging protrusion 63 and the stopper pin 62 from both sides and surrounding the rotating shaft 45, and the shift plate When 48 rotates around the axis of the rotation shaft 45, the shift plate 48 is biased toward the original position by the spring force of the return spring 49.

  The up-side and down-side claw members 50, 51 are disposed on both sides of the ratchet 47 on the other end side of the shift plate 48, and are rotatable with respect to the shift plate 48 via support shafts 64, 65. An up-side wire 66 is connected to the up-side claw member 50 and pulled according to a shift-up operation of the vehicle driver, and the down-side claw member 51 is connected to the down-side claw member 51 according to the down-shift operation of the vehicle driver. The pulled down wire 67 is connected. Thus, the up-side torsion spring 52 urges the up-side claw member 50 so that the up-side claw member 50 is not engaged with the ratchet 47 unless the up-side wire is pulled, and the down-side torsion spring 52 The side torsion spring 53 biases the down side claw member 51 so as not to engage the down side claw member 51 with the ratchet 47 unless the down side wire is pulled.

  According to such a shift change mechanism 43, when the up-side wire 66 is pulled in response to a shift-up operation by the vehicle driver, the up-side claw member 50 rotates counterclockwise in FIG. 2, the shift plate 48 rotates counterclockwise in FIG. 2, and as the arm 46 rotates with the ratchet 47, the connecting shaft 39 moves to the right in FIG. When the traction force due to is released, the shift plate 48 returns to the original state by the spring force of the return spring 49. When the down-side wire 67 is pulled in response to the vehicle driver's down-shifting operation, the down-side claw member 51 rotates in the clockwise direction in FIG. 2 to engage the ratchet 47 and the shift plate 48 is in FIG. As the arm 46 and the ratchet 47 rotate, the connecting shaft 39 moves to the left in FIG. 2 and the spring of the return spring 49 is released when the pulling force by the down wire 67 is released. The shift plate 48 is restored to the original by the force.

  Next, the operation of this embodiment will be described. The first to fifth driven gears 25 to 29 are supported on a cylindrical gear support portion 19a provided on the output shaft 19 so as to be relatively rotatable. It is possible to selectively engage the engagement arm portions 36b, 36b,... Provided on the engagement member 36 that enables axial movement with respect to the gear support portion 19a and disables relative rotation. A plurality of locking projections 31, 31 a, which are arranged on the inner periphery of the fifth speed driven gears 25 to 29 at positions spaced in the circumferential direction and extend in the axial direction of the gears 25 to 29; 32 ..., 32a ...; 33 ..., 33a ...; 34 ..., 34a ...; 35 ..., 35a ... are provided respectively, but their locking projections 31 ..., 31a ...; 32 ..., 32a ...; 33 ..., 33a ...; 34 ..., 34a ...; 35 ..., 3 Specific locking projections 31a ..., 32a ..., 33a ..., 34a ..., 35a ... which are a part of a ... are the specific locking projections 31a ... along the axial direction of the gear support 19a. , 32a ..., 34a ..., 35a ... at least one end of at least one end along the axial direction of the remaining locking projections 31 ..., 32 ..., 33 ..., 34 ..., 35 ... Are arranged closer to the center along the axial direction than the remaining locking protrusions 31, 32, 33, 34, 35, and so on. 32a, 32a ...; 32a ...; 33a ...; 34a, 34a ...; 35 ..., including a plurality of locking projections 31 ..., 31a ...; 32 ..., 32a ...; 35a ... Even if the distance between each other is set small, the specific locking projection 31 ..., 32a ..., 33a ..., 34a ..., 35a ... where the particular locking projections 31a ..., 32a ..., 33a ..., 34a ..., 35a ... The engaging arm portions 36b, 36b,... Of the engaging member 36 need only be inserted into the spaces 32, 33, 34, 35, and the locking projections 31 of the engaging arm portions 36b, 36b,. 31a ...; 32 ..., 32a ...; 33 ..., 33a ...; 34 ..., 34a ...; 35 ..., 35a ... Increases the chance to enter between, and after entering, the engaging arm portions 36b, 36b ... Since it can be engaged with the locking projections 31 ..., 31a ...; 32 ..., 32a ...; 33 ..., 33a ...; 34 ..., 34a ...; Lock projections 31 ..., 31a ...; 32 ..., 32a ...; 33 ..., 33a ...; ..., 34a ...; 35 ..., 35a ... are not delayed in engagement, and it is possible to avoid a delay in torque transmission during a gear shift and to perform a smooth gear shift.

  Further, the specific locking projections 31a, ..., 32a, ..., 34a, ..., 35a ... in the first to fifth driven gears 25 to 29 are a plurality of which the engaging member 36 has at equal intervals in the circumferential direction. Are provided on the inner circumference of the first to fifth speed driven gears 25 to 29 in a number corresponding to the number of the engagement arm portions 36b, 36b. Even if the joint member 36 has a plurality of engaging arm portions 36b, 36b, all the engaging arm portions 36b, 36b, ... are provided with specific locking projections 31a ..., 32a ..., 33a ..., 34a ... , 35a..., 35a.

  In addition, the four engaging arm portions 36b, 36b,... Of the engaging member 36 are arranged at equal intervals in the circumferential direction, and in the first to fifth driven gears 25-29, the specific locking protrusions 31a,. ..., 33a ..., 34a ..., 35a ... and the remaining locking projections 31 ..., 32 ..., 33 ..., 34 ..., 35 ... are alternately arranged in the circumferential direction, so that specific locking is provided. The intervals at which the protrusions 31a, 32a, 33a, 34a, 35a,... Are arranged at equal intervals, and the timing at which the engaging arm portions 36b, 36b,. Thus, a smooth shift change can be made.

  Also, the specific locking projections 31a, ... 32a provided on the inner periphery of the first to fourth speed driven gears 25 to 28 in the first to fourth speed gear trains G1 to G4 other than the fifth speed gear train G5. ..., 33a ..., 34a ... both ends in the axial direction are arranged closer to the center along the axial direction than the axial ends of the remaining locking projections 31 ..., 32 ..., 33 ..., 34 ... The gears 36b, 36b,... Can be easily shifted by either shifting up or shifting down to the inner periphery of the gear to be engaged.

  Further, at the inner periphery of the fifth gear driven gear 29 in the highest gear stage, that is, the fifth gear train G5, arranged at one end portion along the axial direction of the gear support portion 19a, the specific locking projection The axial end of 35a ... opposite to the fourth speed driven gear 34 is disposed at the same position in the axial direction as the axial end of the remaining locking projection 35 ..., and the gear support 19a. Is arranged at one end portion along the axial direction of the arm portion 36b, so that it is not necessary to consider the ease of fitting of the engaging arm portions 36b, 36b... On the side where the engaging arm portions 36b, 36b. By disposing the end of the locking projection 35a on the side opposite to the driven gear 34 for the fourth speed at the same position in the axial direction as the axial end of the remaining locking projection 35 ... It can contribute to the improvement of the rigidity of the stop protrusions 35a.

  The second embodiment of the present invention will be described with reference to FIG. 5, but the parts corresponding to the first embodiment are only shown with the same reference numerals, and the detailed description is as follows. Omitted.

  Lock projections 31 ..., 31a ...; 32 ..., 32a ...; 33 ..., 33a ...; 34 ..., 34a ...; 35 provided on the inner circumference of the first to fifth driven gears 25-29. ..., 35a ... At least one of both ends along the axis of each gear 25-29 of specific locking projections 31a ..., 32a ..., 33a ..., 34a ..., 35a ... is rotation of the gears 25-29. A taper is formed so that the width along the direction is gradually narrowed.

  Thus, in this embodiment, both ends of the specific locking projections 31a, 32a, 33a, 34a provided on the inner circumference of the first to fourth driven gears 25-28 are tapered. The end portion on the fourth speed driven gear 38 side of the both end portions of the specific locking projection 35a provided on the inner periphery of the fifth speed driven gear 29 is a fifth speed driven gear. The width along the rotation direction of 29 is gradually narrowed so as to be tapered.

  According to the second embodiment, the engagement arm portion 36b is provided on the tapered side of both ends of the specific locking projections 31a, ..., 32a, ..., 34a, ..., 35a. ... is reduced in the area corresponding to the specific locking projections 31a ..., 32a ..., 33a ..., 34a ..., 35a ..., and the specific locking projections 31a ..., 32a ..., 33a ..., 34a ..., 35a ... The engagement arms 36b can be smoothly engaged.

  A third embodiment of the present invention will be described with reference to FIG. 6, but the parts corresponding to the first and second embodiments are only given the same reference numerals and shown in detail. The detailed explanation is omitted.

  Of the projections 31 ..., 31a ...; 32 ..., 32a ...; 33 ..., 33a ...; 34 ..., 34a ... provided on the inner circumference of the first to fourth speed driven gears 25-28. .., 32a..., 34a... Are more closely connected to the gear support 19a than the other ends of the remaining locking projections 31. .., 33 a..., 34 a... And the remaining locking projections 31... 33. The distances L1, L2, L3, L4 between ..., 34 ... are set differently for each of the first to fourth speed gear trains G1-G4, and the specific locking projections 31a ..., 32a ..., 33a ..., 34a. The distances L1, L2, L3, L are increased as the rotational speed of the gears provided with. It is set to be longer.

  Also, one end on the fourth speed driven gear 28 side of the specific locking projection 35a ... of the locking projections 35 ..., 35a ... provided in plurality on the inner periphery of the fifth speed driven gear 29 is the remainder. Are arranged closer to the center along the axial direction of the gear support portion 19a (see the first embodiment) than the one end of the locking projection 35 ... and one end of the specific locking projection 35a ... The distance L5 between the one ends of the locking projections 35 is set longer than the distances L1 to L4 in the first to fourth speed gear trains G1 to G4.

  According to the third embodiment, at least one end of the remaining locking projections 31 ..., 32 ..., 33 ..., 34 ..., 35 ... and the specific locking projections 31a ..., 32a ..., 33a ... , 34a..., 35a... Are different for each of the first to fifth speed gear trains G1 to G5, and therefore are for the first to fifth speeds supported by the gear support portion 19a. In consideration of the difference in rotational speed between the driven gears 25 to 29, it is possible to adjust the ease with which the engagement arm portions 36B... Enter according to the rotational speed, and it is possible to increase the reliability of the shift switching.

  Moreover, as the number of rotations of the first to fifth driven gears 25 to 29 provided with the specific locking projections 31a, 32a, 33a, 34a, 35a, increases, the remaining locking projections 31 increase. ..., 32 ..., 33 ..., 34 ..., 35 ..., since the distances L1 to L5 from one end of the specific locking projections 31a ..., 32a ..., 33a ..., 34a ..., 35a ... become longer, driving It is necessary compared with a low-speed gear because the driving torque is small while securing the strength by extending a specific locking projection of a low-speed gear that requires strength due to a large torque in the axial direction of the gear support portion 19a. With a high-speed gear with low strength, the ease of fitting the engagement arm portions 36b can be increased.

  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. Is possible.

16 ... transmission 18 ... input shaft 19 ... output shaft 19a ... gear support portions 25, 26, 27, 28, 29 ... gears 31, 32, 33, 34, 35 ... Locking protrusions 31a, 32a, 33a, 34a, 35a ... Specific locking protrusions 36 ... Engaging members 36b ... Engaging arm parts G1, G2, G3, G4, G5 ... Gears Column

Claims (8)

  A plurality of gear trains (G1, G2, G3, G4, G5) are provided between the input shaft (18) and the output shaft (19) parallel to each other, and the input shaft (18) and the output shaft (19) ) Has a cylindrical gear support (19a) on the same axis, and constitutes a part of the gear train (G1 to G5) of a plurality of shift stages and can rotate relative to the gear support (19a). The gears (25, 26, 27, 28, 29) supported on the inner circumference of the gears (25-29) are arranged at positions spaced apart in the circumferential direction and extend in the axial direction of the gears (25-29). Stop projections (31, 31a; 32, 32a; 33, 33a; 34, 34a; 35, 35a) are provided, respectively, to enable axial movement with respect to the gear support (19a) and disable relative rotation. The engaging protrusion (36) 1, 31a; 32, 32a; 33, 33a; 34, 34a; 35, 35a), wherein the engaging projection (31, 31a; 32) is provided. , 32a; 33, 33a; 34, 34a; 35, 35a), a specific locking projection (31a, 32a, 33a, 34a, 35a) is a shaft of the gear support (19a). The axial direction of the remaining locking projections (31, 32, 33, 34, 35) at least one end of the both ends of the specific locking projections (31a, 32a, 33a, 34a, 35a) along the direction It is formed shorter than the remaining locking projections (31, 32, 33, 34, 35) so as to be arranged closer to the center along the axial direction than at least one end of both ends along the axis. Transmission.   The engagement member (36) has a plurality of engagement arm portions (36b) at equal intervals in the circumferential direction, and the specific locking projections (31a, 32a, 33a, 34a, 35a) The speed change according to claim 1, wherein the number of arms (36b) and the number corresponding to the circumferential relative position and the circumferential relative arrangement are provided on the inner circumference of the plurality of gears (25 to 29). apparatus.   The specific locking projections (31a, 32a, 33a, 34a, 35a) and the remaining locking projections (31, 32, 33, 34, 35) are arranged alternately in the circumferential direction, respectively.   A gear train (G5) of the highest gear stage is disposed at one end portion along the axial direction of the gear support portion (19a), and one of the gear trains (G1 to G4) excluding the gear train (G5) of the highest gear stage. In the inner periphery of the gear (25 to 28) that constitutes a portion and is rotatably supported by the gear support portion (19a), the specific locking projections (31a, 32a, 33a, 34a) The both ends along the axial direction are arranged closer to the center along the axial direction than both ends along the axial direction of the remaining locking projections (31, 32, 33, 34). The transmission of any one of 1-3.   At least one of both end portions along the axial direction of the specific locking projection (31a, 32a, 33a, 34a, 35a) is made to gradually narrow the width along the rotational direction of the gear (25-29). The transmission according to any one of claims 1 to 4, wherein the transmission is tapered.   At least one end along the axial direction of the remaining locking projections (31, 32, 33, 34, 35), and the specific locking projections disposed from at least one end toward the center along the axial direction. The distance between at least one end of (31a, 32a, 33a, 34a, 35a) is set differently for each of the gear trains (G1 to G5) of a plurality of shift stages. The transmission according to any one of the above.   The distance is set longer as the rotational speed of a gear (25-29) provided with the specific locking protrusion (31a, 32a, 33a, 34a, 35a) increases. Gearbox.   At the inner periphery of the maximum gear stage gear train (29) that constitutes a part of the maximum gear stage gear train (G5) disposed at one end portion along the axial direction of the gear support section (19a), the maximum speed shift is performed. On the side opposite to the other gear (28) adjacent to the step gear (29), the end of the specific locking protrusion (35a) is the end of the remaining locking protrusion (35) and the shaft. 5. The transmission according to claim 4, wherein the transmission is disposed at the same position in the direction.

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