JP2011017361A - Manual transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manual transmission generating a dragging torque in a neutral state, canceling the dragging torque independent of an engine rotational number in a shifted state, and preventing an operation force needed during a shift operation from being affected by the engine rotational number.SOLUTION: The manual transmission is equipped with: an inner member 7; an outer member 8; and a compression coil spring 11. The inner member 7 integrally is equipped with: two inner leg parts 7a; an inner installation section 7b installed between the two inner leg parts; and a specific shift head pressing part 7c. The outer member 8 integrally is equipped with: two outer leg parts 8; an outer installation section 8b installed between two outer leg parts 8a on the centrifugal side of the inner installation section 7b; and an interlocking part 8c. A pin member 12 is fitted in the inner member 7. A depression 1a in which one end of the pin member 12 is movable in and out is formed in a shift and select shaft 1. A groove 8d is provided on the inner member 7 side of the outer installation section 8b. The groove 8d has an inclined part 8da and a relief part 8db.

Description

  The present invention relates to a manual transmission mounted on a vehicle such as an automobile. In particular, the present invention relates to a manual transmission that suppresses generation of rattling noise during neutral by operating a synchromesh mechanism.

  In a constant-mesh manual transmission, a gear that is rotatably fitted to one of an input shaft and an output shaft (counter shaft) that are arranged in parallel to each other, and a gear that is provided integrally with the other of them. In some cases, rattling noise may occur due to fluctuations in engine speed.

  The rattling noise is an unpleasant noise for the vehicle occupant and is easy to hear when the passenger compartment is relatively quiet. For example, it is easy to hear when the vehicle is stopped and the gear position is in the neutral state.

  In the manual transmission disclosed in Patent Document 1, in order to suppress such rattling noise, in the synchromesh mechanism, a spring that presses the synchronizer ring toward the spline piece between the synchronizer ring and the clutch hub. Is provided. Further, in this manual transmission, a ball is provided in the clutch hub so as to be movable in the radial direction, and the centrifugal force of the ball opposes the pressing force of the spring so as to press the synchronizer ring away from the spline piece. It has become. Then, the synchronizer ring is pressed toward the spline piece by the spring at the time of low rotation, so that rattling noise caused by fluctuations in the engine speed is suppressed. On the other hand, since the synchronizer ring is separated from the spline piece during high rotation, the generation of drag torque between the synchronizer ring and the spline piece is prevented.

  In addition, the prior art which prevents a rattling sound is also disclosed by patent documents 2-4.

JP-A-8-68428 JP-A-9-96353 Japanese Patent Application Laid-Open No. 8-145575 JP-A-5-39815

  In the manual transmission disclosed in Patent Document 1, even if the gear stage is in a state other than the neutral state (for example, a state where the vehicle is traveling with the gear stage shifted to 1st, 2nd, etc.), the engine is relatively If the rotation is low, drag torque is generated. Since it is not necessary to suppress the rattling noise while the vehicle is running, the drag torque merely causes power loss and fuel consumption deterioration.

  Further, in the manual transmission disclosed in Patent Document 1, if a speed change operation is performed at a high engine speed, an operation force necessary for a shift operation may be excessive.

  The present invention has been devised in view of the above problems, and in a manual transmission that can suppress the occurrence of rattling noise by generating drag torque when the shift speed is in the neutral state, the shift speed is other than in the neutral state. An object of the present invention is to provide a manual transmission that can eliminate drag torque without being affected by the engine speed when in a state, and that does not affect the operating force required for the shift operation due to the engine speed. .

  As means for solving the above-described problems, the manual transmission of the present invention is configured as follows.

  That is, the manual transmission of the present invention rotates around an axis line in response to a select operation, and moves in an axial direction in response to a shift operation, and extends in a radial direction from the shift and select shaft. The shift-and-select lever and the rotating shift-and-select lever have an engaging groove that can be selectively engaged, and the movement of the shift and select lever together with the lever is linked to the operation of the synchromesh mechanism. A plurality of shift heads provided in the engagement groove, and an interlock portion that extends to both sides of the shift-and-select lever in the rotation direction and is configured to rotate integrally with the lever; and It extends in the rotation direction of the shift and select lever on the rotation center side from the lock part, and rotates together with the lever. And a specific shift head pressing portion provided on. Furthermore, an inner member, an outer member, and a biasing member are provided. Here, the inner member includes two inner legs attached to the shift and select shaft so as to be relatively movable in the axial direction, an inner erection part erected between the two inner legs, and the specific shift head. And a pressing portion. The outer member is attached to the shift-and-select shaft so as to be relatively movable in the axial direction with a predetermined play amount on both outer sides of the two inner legs, but is not relatively movable with respect to the transmission case. Two outer leg portions attached to the outer construction portion, an outer construction portion constructed between the two outer leg portions on the distal side of the inner construction portion, and the interlock portion. The urging member urges the inner leg portion and the outer leg portion so that they are separated from each other in the axial direction of the shift and select shaft. One shift head has a height dimension that can be engaged with the specific shift head pressing portion, while the other shift head has a height dimension that cannot be engaged with the specific shift head pressing member. . Further, a pin member having hemispherical ends at both ends is fitted into the inner member so as to be retractable toward the shift-and-select shaft side and the outer erection portion side. Further, the shift and select shaft is formed with a recessed portion through which one end portion of the pin member can enter and exit. Further, a groove portion is provided on the inner member side of the outer erection portion, and the groove portion includes an inclined portion that pushes the pin member that moves together with the inner member in the urging direction by the urging member into the inner member. The pin member that moves together with the inner member in the counter-biasing direction has a relief portion that serves as a escape place for the other end portion of the pin member when the one end portion is removed from the recess portion of the shift and select shaft. . When the shift and select shaft is in the neutral position, the inner member moves until the inner leg portion and the outer leg portion come into contact with each other by the urging force of the urging member, and the other end of the pin member As the portion is pressed by the inclined portion, one end portion of the pin member enters the recessed portion, and the specific shift head pressing portion operates the synchromesh mechanism to such an extent that the speed change operation is not established. The one shift head is moved from the neutral position. On the other hand, when the shift-and-select shaft shifts from the neutral position to the shift position, the shift-and-select shaft pushes one end of the pin member from the recess, and the inclined portion is the other end of the pin member. The specific shift head pressing portion is returned to the neutral position by pressing the portion in the axial direction of the shift-and-select shaft to escape into the escape portion.

  According to the manual transmission having such a configuration, when the operation unit is in the neutral position, the inner member is urged to one side by the urging member and moves until it hits the outer leg portion of the outer member to eliminate the play amount. . When the inner member moves in the same direction, the other end portion of the pin member facing the groove portion of the outer member is pushed into the inner member by the inclined portion formed in the groove portion. At this time, one end portion of the pin member protruding from the inner diameter surface of the inner member to the shift and select shaft side enters a recess formed in the shaft. For this reason, an inner member moves until it hits the outer leg part of an outer member, without preventing the above-mentioned movement. When the inner member moves as described above, the specific shift head pressing portion formed on the inner member also moves in the same direction, and the shift head engaged with the specific shift head pressing portion moves by the play amount. . By setting the play amount to such an amount that the synchromesh mechanism interlocked with the shift head is operated to such an extent that the speed change operation is not established, drag torque (drag resistance) can be generated. After that, when a shift operation is performed, the shift and select shaft moves in the axial direction, one end portion of the pin member is pushed out from the recessed portion, and the other end portion of the pin member is pressed to the opposite side in the axial direction by the inclined portion. Is done. For this reason, the inner member moves against the urging force of the urging member, and the specific shift head pressing portion provided on the inner member and the shift head pressed by the pressing portion return to the neutral position. As a result, the operating state of the synchromesh mechanism is released, and the drag torque that has been generated disappears.

  According to the manual transmission of the present invention, it is possible to suppress the generation of rattling noise by generating drag torque when the shift stage is in the neutral state, and to control the engine speed when the shift stage is in a state other than the neutral state. Therefore, drag torque can be eliminated. Further, since the operation of each member has no relation to the engine rotational power, the operation force required for the shift operation is not affected by the engine speed.

It is sectional drawing which shows a part of constant meshing type manual transmission which concerns on embodiment of this invention. It is AA sectional drawing of FIG. It is the figure which abbreviate | omitted and represented the perspective view of the manual transmission shown in FIG. It is a schematic diagram which shows the shift gate of a known 6-speed manual mission. It is a perspective view of an inner member. It is a perspective view of an external material. It is the schematic which shows the positional relationship of the reverse shift head, a specific shift head press part, and an interlock part. (B) is BB sectional drawing of (a). (C) is CC sectional drawing of (a). It is the schematic which shows the positional relationship of the reverse shift head, a specific shift head press part, and an interlock part. (B) is BB sectional drawing of (a). (C) is CC sectional drawing of (a). It is the schematic which shows the positional relationship of the reverse shift head, a specific shift head press part, and an interlock part. (B) is BB sectional drawing of (a). (C) is CC sectional drawing of (a). FIG. 2 is a diagram illustrating a state in which a shift and select shaft moves in the axial direction from the state shown in FIG. FIG. 2 is a diagram illustrating a state in which a shift and select shaft moves in the axial direction from the state shown in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a part of a constantly meshing manual transmission according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line AA of FIG. FIG. 3 is a perspective view of a part of the manual transmission shown in FIG.

  Reference numeral 1 denotes a shift and select shaft. The shift and select shaft 1 is supported by a bearing portion (not shown) in the transmission case C, and is provided so as to be rotatable about the axis 1n and movable in the direction of the axis 1n. The shift and select shaft 1 is rotated around the axis 1n by the select operation force, and is moved in the direction of the axis 1n by the shift operation force. The shift operation force and the select operation force will be described with reference to the operation of the shift lever L arranged at the shift gate of a known 6-speed manual mission as shown in FIG. This is an operation for moving the lever L in the direction indicated by the arrow X, and the operation force is the select operation force. The shift operation is an operation for moving the shift lever L in the direction indicated by the arrow Y, and the operation force is the shift operation force.

  A shift and select lever 2 extending radially outward is fixed to the shift and select shaft 1. The shift and select lever 2 is mainly composed of a base portion 2a fixed to the outer peripheral portion of the shift and select shaft 1 with a bolt 9 and an arm portion 2b extending in a radial direction from the base portion 2a.

  Reference numeral 3 denotes a shift head for 1st to 2nd gears provided so as to be interlocked with the shift fork shaft 13 for the first gear and the second gear. Reference numeral 4 denotes a shift head for a third speed to a fourth speed stage provided so as to be interlocked with the shift fork shaft 14 for the third speed stage and the fourth speed stage. Reference numeral 5 denotes a shift head for 5th to 6th gears provided so as to interlock with the shift fork shaft 15 for 5th gear and 6th gear. Reference numeral 6 denotes a reverse gear shift head provided in conjunction with the reverse gear shift fork shaft 16.

  The shift fork shafts 13 to 16 for the respective stages are provided with shift forks (not shown) engaged with the sleeves of the synchromesh mechanism, and the shift heads 3 to 6 are arranged along the axis 1 n of the shift and select shaft 1. When a certain amount of movement is made in this direction, the synchromesh mechanism is operated in conjunction with this, and when each of the shift heads 3 to 6 is further moved in the same direction, a shift operation is executed.

  The shift heads 3 to 6 include engagement grooves 3 a to 6 a that can selectively engage with a shift and select lever 2 that rotates together with the shift and select shaft 1. That is, the engagement grooves 3a to 6a of the shift heads 3 to 6 are arranged along the rotation path of the rotating shift and select lever 2, and the shift and select lever 2 changes the rotation angle. It can be engaged with any shift head 3-6. The reverse shift head 6 is formed with a recess 6ab for avoiding engagement with an interlock portion 8c described later within a predetermined range.

  In addition to the shift and select lever 2, an inner member 7 and an outer member 8 are attached to the shift and select shaft 1 so as to be movable relative to the shaft 1 in the direction of the axis 1n.

  As shown in FIGS. 1, 3, and 5, the inner member 7 is integrally provided with two inner leg portions 7a, 7a, an inner erection portion 7b, and a specific shift head pressing portion 7c. The two inner legs 7a, 7a are attached to the shift and select shaft 1 so as to be relatively movable in the direction of the axis 1n with a predetermined interval. In addition, the dimension 7L between the outer end surfaces of the inner legs 7a, 7a is such that the outer legs 8a, 8a, which will be described later, can be moved relative to each other within a certain range in the direction of the axis 1a within the outer member 8. And the dimension between the inner end faces is smaller than 8L. The inner erection part 7b is erected between the two inner leg parts 7a and 7a. The specific shift head pressing portion 7c is provided in a rectangular opening provided in the inner bridge portion 7b. The specific shift head pressing portion 7c will be described in detail later.

  A pin member 12 is fitted in one inner leg portion 7a of the inner member 7 so as to be slidable in the radial direction of the shift and select shaft 1 (see FIGS. 1 and 3). Both ends of the pin member 12 are hemispherical, and are fitted into the shift and select shaft 1 side and the outer member 8b side of the outer member 8 described later so as to be retractable.

  In addition, a recess 1 a through which one end of the pin member 12 can go in and out is formed on the side of the shift and select shaft 1.

  As shown in FIGS. 1, 3 and 6, the external member 8 is integrally provided with two outer leg portions 8a and 8a, an outer erection portion 8b and an interlock portion 8c. The two outer legs 8a and 8a are attached to the shift and select shaft 1 so as to be relatively movable in the direction of the axis 1n while securing a predetermined play amount on both outer sides of the two inner legs 7a and 7a. The outer erection part 8b is erected between the two outer leg parts 8a and 8a. The interlock part 8c is provided in a rectangular opening provided in the outer erection part 8b. The inner interlock portion 8c will be described in detail later. The outer member 8 is relatively movable in the axis 1n direction with respect to the shift-and-select shaft 1, but is locked in the transmission case C and cannot be relatively moved in the axis 1n direction. Yes.

  As shown in FIGS. 1 and 3, around the shift and select shaft 1 between the inner leg portion 7a and the outer leg portion 8a, the inner leg portion 7a and the outer leg portion 8a are arranged in the direction of the axis 1n of the shaft 1. A compression coil spring 11 is provided as an urging member that urges them to move away from each other.

  In addition, on the inner member 7 side of the outer erection part 8b of the outer member 8, a groove part 8d is formed which includes an inclined part 8da and a relief part 8db and extends in the rotational direction. The inclined portion 8da is an inclined surface formed so as to push the pin member 12 that moves together with the inner member 7 in the biasing direction by the compression coil spring 11 described above into the inner member 7. The escape portion 8db has an end portion 12a of the pin member 12 formed such that one end portion of the pin member 12 that moves together with the inner member 7 in the counter-biasing direction can be detached from the recess portion 1a of the shift and select shaft 1. 7 A space (space) for escaping outside is formed.

  The interlock portion 8c extends in the engagement grooves 3a to 6a so as to sandwich the arm portion 2b on both sides of the shift and select lever 1 in the rotational direction. Since the interlock portion 8c is provided so as to sandwich both sides of the lever 1 in the rotation direction, the interlock portion 8c rotates integrally with the lever 1 around the axis 1n. The interlock portion 8c allows movement of one shift head selected by the arm portion 2b, while preventing movement of a plurality of shift heads simultaneously by locking movement of other shift heads. .

  The specific shift head pressing portion 7c sandwiches the arm portions 2b on both sides in the rotation direction of the arm portion 2b of the shift and select lever 2 on the rotation center side (axis 1n side of the shift and select shaft 1) from the interlock portion 8c. So as to extend.

  The height dimensions of the above-described shift heads 3 to 6 are set with respect to the interlock portion 8c and the specific shift head pressing portion 7c arranged as described above. That is, the above-described shift heads 3 to 5 and the reverse shift head 6 are different in height, and only the reverse shift gear 6 can be engaged with the specific shift head pressing portion 7c. The other shift heads 3 to 5 have heights that cannot be engaged with the specific shift head pressing portion 7c. Of course, the interlock portion 8c has a height that allows any of the shift heads 3 to 6 to be engaged.

  The operation of the manual transmission according to the present invention will be described below. When the shift lever L is in the neutral position P3 (see FIG. 4) or other select positions P1, P2, P4, the shift and select shaft 1, the recess 1a, the arm 2b, the inner member 7, the outer member 8, and the pin The positional relationship of the member 12 and the like is as shown in FIG. That is, the shift and select shaft 1 and the recess 1a thereof are in a neutral position in the direction of the axis n. In other words, the arm portion 2b is in a position where the selected shift head (in FIG. 1, the shift head 4 for the third and fourth gears) is not moved in any direction from the neutral position where the synchromesh mechanism is not operated. The inner member 7 is pressed in the direction indicated by the arrow P by the compression coil spring 11, and the inner member 7 is shifted as shown in FIGS. 10, 11, etc. until the inner leg 7 a hits the outer leg 8 a of the outer member 8. It moves by a predetermined play amount Z as compared to the state. When the inner member 7 moves in the direction indicated by the arrow P, the end 12a of the pin member 12 facing the groove 8d of the outer member 8 is pushed into the inner member by the inclined portion 8da formed in the groove 8d. At this time, the other end 12b of the pin member 12 protruding from the inner diameter surface 7d of the inner member 7 toward the shift and select shaft 1 side enters the recess 1a. For this reason, the inner member 7 can move until it hits the outer leg portion 8a of the outer member 8 without being prevented from moving in the direction of the arrow P.

  When the inner member 7 moves in the direction of arrow P as described above, the specific shift head pressing portion 7c formed on the inner member 7 also changes from the state shown in FIGS. 7 (a) to (c) to FIGS. Move to the state shown in (c). That is, the specific shift head pressing portion 7c presses the reverse shift head 6 that is only engaged, and moves the reverse shift head 6 by the play amount Z. At this time, the engagement groove 6a of the reverse shift head 6 is formed with a recess 6ab having a recess amount equal to or greater than the play amount Z that avoids the interlock portion 8c. The play amount Z can be moved without being locked to the interlock portion 8c.

  Thus, when the reverse gear shift head 6 moves, the reverse gear synchromesh mechanism interlocked with the reverse gear shift head 6 operates to such an extent that the shifting operation to the reverse gear is not established, and the input shaft and the counter shaft. A drag torque is generated in one of the gears (for example, a counter gear), and the rattling noise between the gear and the gear on the other side is suppressed.

  When a shift operation is performed from the above state, for example, when the shift lever L is shifted from the neutral position P3 to the shift position 3rd, as shown in FIGS. 9 and 10, the shift lever L is shifted from the neutral position P3. When the shift operation is performed to the position 4th, as shown in FIG. 11, the shift and select shaft 1 is moved from the neutral position in the direction of the axis 1n, and the end 12b of the pin member 12 is pushed out from the recess 1a. The other end 12a of 12 is pressed to the side opposite to the arrow P by the inclined portion 8da and escapes into the escape portion 5db. For this reason, the inner member 7 moves to the opposite side to the arrow P against the pressing force of the compression coil spring 11. Further, as shown in FIG. 9, the specific shift head pressing portion 7c of the inner member 7 returns to the neutral position, and the reverse shift head 6 pressed by the specific shift head pressing portion 7c also returns to the neutral position. Thus, the operating state of the synchromesh mechanism is released, and the drag torque generated in the counter gear disappears.

  The groove width and the position of the escape portion 5db are set so that the specific shift head pressing portion 7c does not come out of the neutral position when the end portion 12a of the pin member 12 escapes to the escape portion 5db, that is, reverse The groove width is set so as not to activate the stepped synchromesh mechanism.

  Further, the force for returning the reverse shift gear 6 to the neutral position is realized by known means such as the neutral position return force of the sleeve in the synchromesh mechanism and the neutral position return force in the positioning mechanism provided on the shift fork shaft. Is done.

  After the shift operation, when the shift lever L is returned again to the neutral position P3, the select positions P1, P2, P3, etc., the shift and select shaft 1 returns to the neutral position, and as shown in FIG. Then, it moves until it comes into contact with the outer leg portion 8a of the outer member 8. At the same time, the pin member 12 is pushed into the inner member by the inclined portion 8ca having the end portion 12a formed in the groove portion 8d, and the other end portion 12b of the pin member 12 is formed in the shift and select shaft 1. It enters into the hollow part 1a. As a result, the reverse-stage synchromesh mechanism interlocked with the reverse-stage shift head 6 operates again to such an extent that the shift operation to the reverse-stage is not established, and drag torque is generated to prevent rattling noise.

  As is apparent from the above description, according to the manual transmission according to the embodiment of the present invention, at the neutral time, the reverse gear synchromesh mechanism operates to the extent that the shift operation to the reverse gear is not established, and the drag torque To suppress the occurrence of rattling noise. Further, when the gear is shifted to any one of the gear positions, the reverse gear shift head 6 pressed by the specific shift head pressing portion 7c of the inner member 7 returns to the neutral position and the operation of the synchromesh mechanism is released. The drag torque that has been generated disappears.

  In addition, since each member in the manual transmission according to the embodiment of the present invention does not relate to the rotational force of the engine, the operational force necessary for the shift operation is not affected by the engine rotational speed.

  In the above-described embodiment, the reverse shift synchromesh mechanism is operated by moving the reverse shift head in the neutral position in order to generate drag torque and suppress rattling noise. Instead of the stage shift head, any one of the forward stage shift heads may be moved to operate the forward stage synchromesh mechanism corresponding to the forward stage shift head.

  INDUSTRIAL APPLICABILITY The present invention can be applied to a constantly meshing manual transmission mounted on an automobile, and more particularly, to a manual transmission that prevents a rattling noise from being generated by operating a synchromesh mechanism.

DESCRIPTION OF SYMBOLS 1 Shift and select shaft 1a Indentation part 1n Axis 2 Shift and select lever 3 Shift head for 1st-2nd speed stage 3a Engaging groove 4 Shift head for 3rd-4th speed stage 4a Engaging groove 5 5th-6th speed stage Shift head 5a Engaging groove 6 Reverse gear shift head 6a Engaging groove 6ab Recess 7 Inner member 7a Inner leg 7b Inner erection part 7c Specific shift head pressing part 8 External material 8a Outer leg part 8b Outer erection part 8c Interlock Part 8d Groove part 8da Inclined part 8db Escape part 11 Compression coil spring (biasing member)
12 Pin member

Claims (1)

A shift-and-select shaft that rotates around an axis in response to a select operation and moves in an axial direction in response to a shift operation;
A shift and select lever extending radially from the shift and select shaft;
The rotating shift and select lever has an engaging groove that can be selectively engaged, and a plurality of shifts are provided so that the movement of the shift and select lever together with the lever interlocks with the operation of the synchromesh mechanism. Head,
An interlock portion that extends to both sides in the rotational direction of the shift and select lever in the engagement groove, and is provided so as to rotate integrally with the lever.
A specific shift head pressing portion that extends in the rotation direction of the shift and select lever on the rotation center side from the interlock portion and is provided so as to rotate integrally with the lever;
A manual transmission comprising:
Two inner legs attached to the shift and select shaft so as to be relatively movable in the axial direction, an inner erection part erected between the two inner legs, and the specific shift head pressing part are integrated. An inner member
A predetermined play amount is secured on both outer sides of the two inner legs, and the shift and select shaft is attached to the shift and select shaft so as to be relatively movable in the axial direction, while being attached to the transmission case so as not to be relatively movable in the axial direction. Two outer legs, an outer erection part constructed between the two outer leg parts on the distal side of the inner erection part, and an outer member integrally having the interlock part,
An urging member that urges the inner leg portion and the outer leg portion of the one to move apart from each other in the axial direction of the shift and select shaft;
With
One of the shift heads has a height dimension that can be engaged with the specific shift head pressing portion, while the other shift head has a height dimension that cannot be engaged with the specific shift head pressing member.
In the inner member, pin members having hemispherical ends are fitted so as to be freely retractable toward the shift and select shaft side and the outer erection part side,
The shift and select shaft is formed with a recess that allows one end of the pin member to enter and exit,
A groove is provided on the inner member side of the outer erection part,
The groove portion includes an inclined portion that pushes the pin member that moves together with the inner member in the urging direction by the urging member into the inner member, and the pin member that moves together with the inner member in the counter-biasing direction is shifted. An escape portion that serves as a refuge for the other end portion of the pin member when the one end portion is detached from the recess portion of the and select shaft;
When the shift and select shaft is in the neutral position, the inner member moves until the inner leg portion and the outer leg portion come into contact with each other by the urging force of the urging member, and the other end portion of the pin member is moved. When pressed by the inclined portion, one end portion of the pin member enters the recessed portion, and the specific shift head pressing portion operates the synchromesh mechanism to the extent that the shift operation is not established. Move the two shift heads from the neutral position,
When the shift and select shaft shifts from the neutral position to the shift position, the shift and select shaft pushes one end portion of the pin member from the recess, and the inclined portion pushes the other end portion of the pin member. The specific shift head pressing portion is returned to the neutral position by pressing in the axial direction of the shift and select shaft to escape into the escape portion,
A manual transmission characterized by that.

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