JP7141349B2 - manual transmission - Google Patents

Description

The present invention relates to a manual transmission mounted on a vehicle.

2. Description of the Related Art Conventionally, as a transmission mounted on a vehicle, a manual transmission that selects and switches a desired gear stage from a plurality of gear stages (transmission stages) by shifting a shift lever has been widely used (for example, , see Patent Document 1).

The manual transmission disclosed in Patent Document 1 mainly includes an input shaft to which engine driving force (torque) is input via a clutch, and an input shaft that is arranged parallel to the input shaft and connected to the input shaft via a reduction gear. , a countershaft on which a plurality of gears are provided in the axial direction, and a plurality of gears arranged coaxially with the input shaft and meshing with the plurality of gears provided on the countershaft to form a plurality of gear stages (transmission gear train). is provided in the axial direction, and a mesh clutch (dog clutch) of a synchromesh mechanism that switches each of a plurality of gear stages to a power transmission state or a neutral state (cutoff state). Then, the dog clutch operates according to the driver's operation of the shift lever, and the gear stage corresponding to the position of the shift lever is selected (that is, the gear is shifted) from among a plurality of gear stages.

JP 2013-113387 A

By the way, in a vehicle equipped with a manual transmission, immediately after the clutch is released from the state in which the clutch is engaged in the neutral range while the vehicle is stopped (i.e., the state in which the shift lever is in the neutral position and the clutch pedal is released) When the shift lever is moved from the neutral position to, for example, the 1st gear position immediately after the clutch pedal is stepped on from the start position, abnormal noise and vibration may occur. Therefore, there has been a demand to prevent the occurrence of such abnormal noise and vibration.

The present invention has been made to solve the above problems. In a vehicle equipped with a manual transmission, when the vehicle is stopped, immediately after the clutch is released from the state in which the clutch is engaged in the neutral range (i.e., shift Abnormal noise and vibration that can occur when the shift lever is moved from the neutral position to, for example, the 1st gear position immediately after the clutch pedal is depressed from the state where the lever is in the neutral position and the clutch pedal is released. An object of the present invention is to provide a manual transmission capable of preventing the occurrence of

The inventors of the present invention obtained the following knowledge as a result of earnestly examining the above problems. That is, when the vehicle is stopped and the clutch is engaged in the neutral range (the shift lever is in the neutral position and the clutch pedal is released), the input shaft rotates (rotates). Therefore, immediately after the clutch is released (immediately after the clutch pedal is depressed), the input shaft rotates due to inertia. Therefore, if the shift lever is moved from the neutral position to, for example, the 1st gear position immediately after the clutch is released (immediately after the clutch pedal is depressed), the input shaft rotates due to inertia, so when the synchros engage In addition, it has been found that the backlash of the propeller shaft, drive shaft, etc., and the backlash of the rear differential, etc., which exist downstream of the output shaft, suddenly become clogged, causing an abnormal noise such as a thud and vibration. got

Therefore, in the automatic transmission according to the present invention, the input shaft to which the driving force from the engine is input is arranged coaxially with the input shaft, and a notch is formed on the outer peripheral surface along the entire circumference along the circumferential direction. and a plurality of gears arranged in parallel with the input shaft and the output shaft and meshing with a plurality of gears provided along the axial direction of the input shaft or the output shaft to form a plurality of gear stages. a countershaft provided along the , a shift rod interlocked with the shift lever and moving to select a gear stage corresponding to the position of the shift lever from among a plurality of gear stages in response to a shift operation; It is attached to the shift rod, and when the shift lever is in the neutral position, it fits into a notch formed in the outer peripheral surface of the output shaft, contacts the input shaft side surface of the notch, and moves the output shaft to the input shaft side. and a pressing member that presses the output shaft against the rear end surface of the input shaft.

According to the automatic transmission of the present invention, the notch is formed in the outer peripheral surface of the output shaft along the entire circumference along the circumferential direction, and the shift rod is provided with the notch when the shift lever is in the neutral position. It fits into a notch formed on the outer peripheral surface of the output shaft, abuts against the input shaft side surface of the notch, presses the output shaft toward the input shaft, and pushes the output shaft toward the rear end surface of the input shaft. A pressing member is attached to make contact with the . Therefore, when the output shaft is in neutral, the output shaft is pushed toward the input shaft and the front end surface of the output shaft is pressed against the rear end surface of the input shaft. Spline looseness, gear backlash, and the like that may exist downstream of are eliminated in advance. As a result, when the vehicle is stopped, immediately after the clutch is released from the state in which the clutch is engaged in the neutral range (that is, immediately after the clutch pedal is depressed from the state in which the shift lever is in the neutral position and the clutch pedal is released) ), it is possible to prevent the occurrence of noise and vibration that may occur when the shift lever is moved from the neutral position to, for example, the first speed position. In addition, since the notch is formed on the outer peripheral surface of the output shaft along the entire circumference along the circumferential direction, the pressing member can be fitted into the notch regardless of the rotation position of the output shaft ( i.e. pushing the output shaft).

In the automatic transmission according to the present invention, the pressing member has an arc-shaped distal end portion and an elastic member provided between the distal end portion and the shift rod so as to extend and contract in the axial direction of the pressing member. It is preferable to have

With this configuration, when the pressing member is fitted into the notch, the pressing member expands to push out the tip of the pressing member, so that the pressing member can be reliably fitted into the notch. On the other hand, when the pressing member is pulled out from the notch, the tip of the pressing member is retracted by compressing the pressing member, and the operating force (the force required for pulling out) can be reduced.

Further, in the automatic transmission according to the present invention, it is preferable that the notch formed in the outer peripheral surface of the output shaft has an arcuate cross section along the axial direction. In this way, it is possible to reduce the operating force of the shift lever (in particular, the force required to remove the pressing member from the notch) while ensuring the pressing force. That is, it is possible to achieve both the contradictory pressing force and operating force.

Furthermore, in the automatic transmission according to the present invention, it is preferable that the diameter of the arc of the notch formed on the outer peripheral surface of the output shaft is larger than the diameter of the arc of the tip portion of the pressing member. With this configuration, the tip of the pressing member can be brought into contact only with the input shaft side surface of the notch of the output shaft, and the output shaft can be more reliably pressed toward the input shaft.

On the other hand, in the automatic transmission according to the present invention, the pressing member includes a tapered distal end portion and an elastic member provided between the distal end portion and the shift rod so as to extend and contract in the axial direction of the pressing member. It is also preferable to set it as the structure which has this.

At this time, in the automatic transmission according to the present invention, it is preferable that the notch formed in the outer peripheral surface of the output shaft has a U-shaped cross section along the axial direction.

Even in such a configuration, when the pressing member is fitted into the notch, the pressing member expands, so that the tip of the pressing member is pushed out, so that the pressing member can be reliably fitted into the notch. . On the other hand, when the pressing member is pulled out from the notch, the tip of the pressing member is retracted by compressing the pressing member, and the operating force (the force required for pulling out) can be reduced. Further, it is possible to reduce the operating force of the shift lever (in particular, the force required to remove the pressing member from the notch) while ensuring the pressing force. That is, it is possible to achieve both the contradictory pressing force and operating force.

In addition, in the automatic transmission according to the present invention, it is preferable that the pressing member is attached to the shift rod so that the axis of the pressing member is substantially orthogonal to the axis of the shift rod and the axis of the output shaft. With this arrangement, the pressing member can be reliably fitted into the notch.

Further, in the automatic transmission according to the present invention, it is preferable that the pressing member is disengaged from the notch formed in the outer peripheral surface of the output shaft in gears other than neutral. By doing so, it is possible to prevent the occurrence of friction due to contact between the input shaft and the output shaft except when the vehicle is in neutral (that is, when the vehicle is running).

According to the present invention, in a vehicle equipped with a manual transmission, when the vehicle is stopped, immediately after the clutch is released from the state in which the clutch is engaged in the neutral range (i.e., the shift lever is in the neutral position and the clutch pedal is not depressed). Immediately after the clutch pedal is stepped on from the released state, it is possible to prevent abnormal noise and vibration that may occur when the shift lever is operated from the neutral position to, for example, the first speed position.

It is a sectional view showing the whole manual transmission composition concerning an embodiment. FIG. 2 is a view (an enlarged view of the framed portion in FIG. 1) showing the positional relationship of the pressing mechanism (the pressing member and the notch of the output shaft) provided in the manual transmission according to the embodiment when the vehicle is in neutral. FIG. 10 is a diagram showing the positional relationship of the pressing mechanism (the pressing member and the notch of the output shaft) provided in the manual transmission according to the modification when the vehicle is in neutral. It is a figure which shows the shift pattern of a 6-speed transmission.

Preferred embodiments of the present invention will be described in detail below with reference to the drawings. In the drawings, the same reference numerals are used for the same or corresponding parts. Further, in each figure, the same elements are denoted by the same reference numerals, and overlapping descriptions are omitted.

First, the configuration of a manual transmission 1 according to an embodiment will be described with reference to FIGS. 1 and 2. FIG. FIG. 1 is a cross-sectional view showing the overall configuration of the manual transmission 1. As shown in FIG. FIG. 2 is a view showing the positional relationship of the pressing mechanism (the pressing member 61 and the notch 40a of the output shaft 40) provided in the manual transmission 1 when in neutral (an enlarged view of the portion enclosed by the frame in FIG. 1). ). In this embodiment, the manual transmission 1 is of an input reduction gear type having reduction gears 35A and 35B between the input shaft 20 and the countershaft 30 as an example.

The manual transmission 1 is arranged in parallel with an input shaft 20 to which driving force (torque) from the engine is input via a dry clutch 10, and the input shaft 20 and reduction gears 35A and 35B. A countershaft 30, which is connected to the input shaft 20 and has a plurality of gears 37A, 34A, 33A, 32A, 31A, and 36A along the axial direction, and a rear end surface of the input shaft 20 coaxially with a clearance therebetween. A plurality of gears 37B, 34B, 33B, 32B, 31B, 36B are provided along the axial direction and are arranged through the countershaft 30 and mesh with the plurality of gears 37A, 34A, 33A, 32A, 31A, 36A provided on the countershaft 30, respectively. The output shaft 40 is provided.

The input shaft 20 and the output shaft 40 are rotatable relative to each other via bearings 21 . Further, the output shaft 40 is immovable in the radial direction and movable in the axial direction to the extent that the clearance between the rear end surface of the input shaft 20 and the rear end surface of the input shaft 20 can be reduced by the bearings 21 and 22, and , is rotatably supported. Further, the output shaft 40 has a notch (groove) 40a formed along the entire circumference along the circumferential direction on the outer peripheral surface.

Here, the notch 40a formed on the outer peripheral surface of the output shaft 40 has an arc-shaped cross section along the axial direction. Further, the diameter of the arc of the notch 40a formed on the outer peripheral surface of the output shaft 40 is formed larger than the diameter of the arc of the tip portion 61c of the pressing member 61, which will be described later. The angle of inclination of the arc of the notch 40a is such that the pressing member 61 can push the output shaft 40 toward the input shaft 20 (that is, the clearance can be reduced), and the notch 40a can move from the notch 40a to the pressing member. It is set so that the operating force when pulling out 61 is not excessive.

First and second speed drive gears 31A and 32A and a reverse drive gear 37A are fixed to the countershaft 30, and third and fourth speed drive gears 33A and 34A and a third speed drive gear 33A and 34A are fixed to the countershaft 30. A 6-speed drive gear 36A is rotatably mounted. On the other hand, the output shaft 40 is rotatably mounted with first and second speed driven gears 31B and 32B and a reverse driven gear 37B. Driven gears 33B, 34B, 36B are fixed. These drive gears 31A, 32A, 33A, 34A, 36A and driven gears 31B, 32B, 33B, 34B, 36B mesh with each other to form forward gear trains, ie, gear stages. It should be noted that the manual transmission 1 is of a 5th speed direct connection type and does not have a 5th speed.

The output shaft 40 is provided with a switching mechanism 41 for switching between the power transmission state and the neutral state of the first and second gears, and a switching mechanism 41 for switching between the power transmission state and the neutral state for the fifth gear (directly coupled) and the reverse gear. A switching mechanism 43 for switching between the state and the state is mounted. Further, the countershaft 30 is provided with a switching mechanism 42 for switching the gear stages of the third speed and the fourth gear between the power transmission state and the neutral state, and a switching mechanism 42 for switching the gear stage of the sixth speed between the power transmission state and the neutral state. A mechanism 44 is attached. These switching mechanisms 41 to 44 are synchromesh mechanisms.

The switching mechanism 41 has a synchro hub 41a which is arranged between the two driven gears 31B and 32B of the first speed and the second speed and which is fixed to the output shaft 40, and a synchro sleeve 41b which always meshes with this. ing. When the synchro sleeve 41b is meshed with the spline 31C formed integrally with the driven gear 31B, the first speed is set. Similarly, the switching mechanism 43 includes a synchro hub 43a which is arranged between the fifth gear (directly coupled) gear 35A and the reverse driven gear 37B and which is fixed to the output shaft 40, and a synchro sleeve which always meshes with this. 43b. When the synchro sleeve 43b is meshed with a spline 35C formed integrally with the gear 35A, the gear 35A is set to the fifth speed (directly connected). be done.

The other switching mechanisms 42 and 44 also have a structure similar to that of the switching mechanism 41. Synchro hubs 42a and 44a fixed to the countershaft 30, and synchro sleeves 42b and 42b which are always meshed with the synchro hubs 42a and 44a, respectively. 44b. By meshing these synchro sleeves 42b, 44b with splines 33C, 34C, 36C integrally formed on the drive gears 33A, 34A, 36A, respectively, the gear stage can be any of the third, fourth, and sixth gears. is set to A synchro mechanism is provided between each of the synchro sleeves 41b to 44b and each of the splines 31C to 37C to synchronize their rotation.

In order to operate the switching mechanisms 41 to 44, the respective synchro sleeves 41b to 44b are gripped by the shift forks 41d to 44d, and the synchro sleeves 41b to 44b move in the axial direction as the shift forks 41d to 44d move. . The shift forks 41d to 44d and a shift lever (shifter arm) 70 (see FIG. 4) in the vehicle interior are connected via a shift rod 50. When the shift lever 70 is manually operated, the synchro sleeves 41b to 44b move. The desired gear stage is switched to the power transmission state. That is, the shift rod 50 is interlocked with the shift lever 70, and according to the shift operation (that is, following the movement of the shift lever 70 in the select direction (X direction)/shift direction (Y direction)), a plurality of It moves so as to select a gear stage corresponding to the position of the shift lever 70 from among the gear stages.

The shift rod 50 is arranged parallel to the output shaft 40 . A cylindrical pressing member 61 having an arcuate tip portion 61c protrudes from the shift rod 50 . The pressing member 61 is attached to the shift rod 50 such that its axis is substantially orthogonal to the axis of the shift rod 50 and the axis of the output shaft 40 .

The pressing member 61 includes an arc-shaped distal end portion 61c (for example, a sphere), a cylindrical main body portion (cylinder) 61a, and a coil spring 61b (described in the scope of claims) accommodated inside the main body portion 61a. (corresponding to the elastic member of ). The coil spring 61b is telescopically arranged between the tip portion 61c and the bottom portion of the body portion 61a (that is, the shift rod 50). A plunger such as a ball plunger or a pin plunger can be suitably used as the pressing member 61, for example. When the pressing member (plunger) 61 is in the neutral position, the coil spring 61b is expanded and the tip portion 61c is pushed out (initial state). pushed into.

Therefore, as shown in FIG. 2, when the shift lever 70 (shift rod 50) is in the neutral position, the pressing member 61 is fitted into the notch 40a formed on the outer peripheral surface of the output shaft 40, and the notch 40a is engaged. The surface of the notch 40a on the input shaft 20 side is brought into contact, the output shaft 40 is pressed (pressurized) toward the input shaft 20, and the front end surface of the output shaft 40 is brought into contact (or sliding contact) with the rear end surface of the input shaft 20. ).

The pressing member 61 is removed from the notch 40a formed on the outer peripheral surface of the output shaft 40 when the shift lever 70 (shift rod 50) is in a position other than the neutral position. More specifically, as shown in FIG. 2, the pressing member 61 moves to the right with respect to the neutral position in the 1st, 3rd, and 5th gears, and moves to the right in the 2nd, 4th, and 6th gears. , to the left with respect to the neutral position.

Next, the operation of the pressing mechanism (the pressing member 61 and the notch 40a) of the manual transmission 1 will be described. With the configuration as described above, the notch 40a is formed in the outer peripheral surface of the output shaft 40 along the entire circumference along the circumferential direction, and the shift rod 50 is arranged so that the shift lever 70 is in the neutral position. At some point, it fits into the notch 40a formed on the outer peripheral surface of the output shaft 40, contacts the surface of the notch 40a on the input shaft 20 side, and presses (pressurizes) the output shaft 40 toward the input shaft 20 side. 2, when the shift lever 70 is operated to the neutral position, as shown in FIG. In addition, the output shaft 40 is pushed toward the input shaft 20, and the front end surface of the output shaft 40 is pressed against the rear end surface of the input shaft 20, so that a slight torque is transmitted from the input shaft 20 to the output shaft 40. Spline backlash and gear backlash that may exist downstream of the output shaft 40 are eliminated in advance.

On the other hand, when the shift lever 70 is operated from the neutral position to the odd-numbered gear (1st, 3rd, 5th gear), the shift rod 50, that is, the pressing member 61 moves to the right side of the drawing relative to the neutral position, and the output shaft 40 is removed from the notch 40a formed on the outer peripheral surface. Therefore, the front end surface of the output shaft 40 and the rear end surface of the input shaft 20 are separated from each other. Similarly, when the shift lever 70 is operated from the neutral position to the even-numbered gears (2nd, 4th, and 6th gears), the shift rod 50, that is, the pressing member 61 moves leftward in the drawing with respect to the neutral position, It is removed from the notch 40a formed on the outer peripheral surface of the shaft 40. Therefore, the front end surface of the output shaft 40 and the rear end surface of the input shaft 20 are separated from each other.

As described in detail above, according to the present embodiment, when the vehicle is stopped, immediately after the clutch 10 is released from the state in which the clutch 10 is engaged in the neutral range (that is, when the shift lever 70 is in the neutral position and the clutch is It is possible to prevent abnormal noise and vibration that may occur when the shift lever 70 is moved from the neutral position to, for example, the 1st gear position immediately after the clutch pedal is depressed after the pedal is released. It becomes possible. In addition, since the notch 40a is formed on the outer peripheral surface of the output shaft 40 along the entire circumference along the circumferential direction, the notch 40a is formed in the pressing member 61 regardless of the rotation position of the output shaft 40. 40a (i.e. push output shaft 40).

According to this embodiment, the pressing member 61 includes a tip portion 61c formed in an arc shape, and a coil spring 61b provided between the tip portion 61c and the shift rod 50 so as to extend and contract in the axial direction. have. Therefore, when the pressing member 61 is fitted into the notch 40a, the extension of the coil spring 61b pushes out the tip portion 61c of the pressing member 61, so that the pressing member 61 can be reliably fitted into the notch 40a. . On the other hand, when the pressing member 61 is pulled out from the notch 40a, the tip portion 61c of the pressing member 61 is retracted due to the compression of the coil spring 61b, and the operating force (the force required for pulling out) can be reduced. can.

Further, in the present embodiment, the notch 40a formed on the outer peripheral surface of the output shaft 40 has an arcuate cross section along the axial direction. Therefore, it is possible to reduce the operating force of the shift lever 70 (in particular, the force required to remove the pressing member 61 from the notch 40a) while ensuring the pressing force. That is, it is possible to achieve both the contradictory pressing force and operating force.

Furthermore, according to this embodiment, the diameter of the arc of the notch 40 a formed on the outer peripheral surface of the output shaft 40 is set larger than the diameter of the arc of the tip portion 61 c of the pressing member 61 . Therefore, the tip portion 61c of the pressing member 61 can be brought into contact only with the input shaft 20 side surface of the notch 40a of the output shaft 40, and the output shaft 40 can be more reliably pressed toward the input shaft 20 side. can be done.

According to the present embodiment, the pressing member 61 is disengaged from the notch 40a formed on the outer peripheral surface of the output shaft 40 in gears other than neutral. and the output shaft 40 can be prevented from generating friction.

(Modification)
In the embodiment described above, the tip portion 61c of the pressing member 61 is formed in an arc shape (spherical shape). good.

Therefore, a pressing mechanism according to a modification will be described with reference to FIG. FIG. 3 is a diagram showing the positional relationship of the pressing mechanism (the pressing member 61B and the notch 40b of the output shaft 40B) according to the modified example when in neutral. In addition, in FIG. 3, the same code|symbol is attached|subjected about the same or equivalent component as the said embodiment.

The pressing member 61B differs from the above-described embodiment in that it has a tapered (conical or truncated conical) tip 61Bc instead of the arc-shaped tip 61c. . Other configurations are the same as or similar to those of the above-described embodiment (pressing member 61), so detailed description thereof is omitted here.

Further, the notch 40b formed on the outer peripheral surface of the output shaft 40B is different from the above-described embodiment in that the cross section along the axial direction is formed in a U-shape in katakana. Other configurations are the same as or similar to the above-described embodiment (notch 40a), so detailed description thereof will be omitted here.

This modification can also provide the same effects as the above-described embodiment. That is, as shown in FIG. 3, when the shift lever 70 is operated to the neutral position, the output shaft 40B is pushed toward the input shaft 20 so that the front end surface of the output shaft 40B contacts the rear end surface of the input shaft 20. Since they are pressed against each other, a small amount of torque is transmitted from the input shaft 20 to the output shaft 40B, and spline backlash and gear backlash that may exist downstream of the output shaft 40B are reduced in advance. Therefore, when the vehicle is stopped, immediately after the clutch 10 is released from the state in which the clutch 10 is engaged in the neutral range (that is, the shift lever 70 is in the neutral position and the clutch pedal is depressed from the state in which the clutch pedal is released). It is possible to prevent abnormal noise and vibration that may occur when the shift lever 70 is moved from the neutral position to, for example, the 1st speed position immediately after the gear shift.

In addition, in this modification, the tip portion 61Bc of the pressing member 61B is tapered (conical or truncated cone), and the notch 40b formed on the outer peripheral surface of the output shaft 40B extends along the axial direction. The cross section is U-shaped. Therefore, it is possible to reduce the operating force of the shift lever 70 (in particular, the force required to remove the pressing member 61B from the notch 40b) while ensuring the pressing force. That is, it is possible to achieve both the contradictory pressing force and operating force.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and various modifications are possible. For example, in the above embodiment, the present invention is applied to an input reduction gear type manual transmission 1 in which the reduction gears 35A and 35B are provided between the input shaft 20 and the countershaft 30. As explained, the invention is also applicable to manual transmissions of the output reduction gear type, in which the reduction gear is provided between the countershaft and the output shaft. Further, in the above embodiment, the manual transmission 1 is applied to the manual transmission 1 having the highest gear stage of 6th speed, but the highest gear stage may be other than 6th gear (for example, 5th gear).

In the above embodiment, the tip portions 61a and 61Ba of the pressing members 61 and 61B are formed in an arc or tapered shape, but the shape of the tip portions 61a and 61Ba of the pressing members 61 and 61B is limited to the above embodiment. For example, it can be formed into an arbitrary shape in consideration of the pressing force, the operating force, and the like.

Similarly, in the above embodiment, the cutouts 40a and 40b are formed to have an arcuate or U-shaped cross section, but the shape of the cutouts 40a and 40b is not limited to the above embodiment. The tip portions 61a and 61Ba of 61 and 61B can be formed in any shape (for example, V-shape, U-shape, etc.) according to the shape and required requirements.

1 Manual Transmission 10 Dry Clutch 20 Input Shaft 30 Counter Shaft 31A-37A Driving Gear 31B-37B Driven Gear 40, 40B Output Shaft 40a, 40b Notch 41-44 Switching Mechanism 50 Shift Rod 61, 61B Pressing Member 61b, 61Bb Coil Spring 61c, 61Bc Tip 70 Shift lever

Claims (8)

an input shaft to which driving force from the engine is input;
an output shaft arranged coaxially with the input shaft and having a notch formed on the outer peripheral surface along the entire circumference along the circumferential direction;
A plurality of gears arranged in parallel with the input shaft and the output shaft and meshing with a plurality of gears provided along the axial direction of the input shaft or the output shaft to form a plurality of gear stages are arranged along the axial direction. a countershaft provided in the
a shift rod that is interlocked with a shift lever and moves to select a gear stage corresponding to the position of the shift lever from among the plurality of gear stages in accordance with a shift operation;
When the shift lever is in the neutral position, the shift lever is fitted into a notch formed in the outer peripheral surface of the output shaft, abuts on the input shaft side surface of the notch, and pushes the output shaft. and a pressing member that presses the output shaft toward the input shaft to bring the front end surface of the output shaft into contact with the rear end surface of the input shaft. The pressing member has an arc-shaped distal end portion and an elastic member provided between the distal end portion and the shift rod so as to extend and contract in the axial direction of the pressing member. A manual transmission as claimed in claim 1. 3. The manual transmission according to claim 2, wherein the notch formed in the outer peripheral surface of the output shaft has an arcuate cross section along the axial direction. 4. The manual transmission according to claim 3, wherein the diameter of the arc of the notch formed on the outer peripheral surface of the output shaft is larger than the diameter of the arc of the tip portion of the pressing member. The pressing member has a tapered distal end portion and an elastic member provided between the distal end portion and the shift rod so as to extend and contract in the axial direction of the pressing member. A manual transmission as claimed in claim 1. 6. The manual transmission according to claim 5, wherein the notch formed in the outer peripheral surface of the output shaft has a U-shaped cross section along the axial direction. 7. The pressing member is attached to the shift rod such that the axis of the pressing member is substantially orthogonal to the axis of the shift rod and the axis of the output shaft. manual transmission described in . 8. The method according to any one of claims 1 to 7, wherein when the shift lever is in a position other than the neutral position, the pressing member is disengaged from a notch formed in the outer peripheral surface of the output shaft. manual transmission.

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