JPH11210881A - Retreat erroneous selection preventing mechanism for automobile gear transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smooth operation at the time of moving an operation lever to a vehicular lateral direction by stopping accurately at a prescribed neutral position the operation lever returned from the front side of its neutral position toward the rear side. SOLUTION: An impeding means 19 is provided with the second turning body 22 provided in the vicinity of the first turning body 8, the first engaging arm 26 projected on the first turning body 8, the scond engaging arm 27 projected on the second turning body 22, and a stopper arm 28. When an operation lever is moved from the front side of its neutral position toward the rear side passing the neubal position, the projected end of the stopper arm 28 is brought into contact with one part of a body stationary side member 5 to bring the first engaging arm 26 turning together with the first turning body 8 into pressure contact with the second engaging arm 27, more turning of the first turning body 8 is impeded, and respective pressure contact faces 26a, 27a of the first and second engaging arms 26, 27 brought into pressure contact each other are brought into face contact mutually.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear transmission for an automobile, and more particularly, to a case where it is desired to select various shifting states of a gear set for shifting by operating a shift operation on an operating lever. The present invention relates to a reverse reverse switching prevention mechanism for preventing a sudden shift from a forward shift state to a reverse shift state.

[0002]

2. Description of the Related Art An example of a reverse gear change prevention mechanism for an automobile gear transmission described above is disclosed in Japanese Utility Model Publication No. 7-35162, particularly as shown in FIGS.

According to this, an operation lever is supported so as to be movable with respect to a vehicle body stationary side member such as a vehicle body and a transmission case, and the operation lever reciprocates forward and backward from a neutral position. While being free,
It is reciprocally movable from the neutral position in the vehicle width direction. When the operation lever is moved forward from the neutral position, the gear set interlocked with the operation lever via the first rotating body is set in a forward shift state, and the operation lever is moved from the neutral position. When the gear set is moved backward, the gear set interlocked with the operation lever via the first rotating body is set in a reverse speed change state.

When the operation lever moved backward in front of the neutral position is to be moved backward beyond the neutral position in the direction of the backward movement, the operation lever is prevented from moving backward. Means are provided.

[0005] The blocking means includes a second rotating body supported to be rotatable with respect to the vehicle body stationary side member near the first rotating body, and a first rotating body protruding from the first rotating body. An engaging arm; and a second engaging arm protruding from the second rotating body and rotatably engaging with the first engaging arm rotating with the first rotating body.

When the operating lever is to be moved rearward from the front of the neutral position beyond the neutral position, the first engaging arm that rotates together with the first rotating body is connected to the second engaging arm. (Particularly, FIG. 12a of the above-mentioned publication), further rotation of the first rotating body is prevented, that is, the operation lever is moved forward from the neutral position and beyond the neutral position. If you try to move it backwards,
This backward movement is prevented.

In other words, when the shift operation of the operation lever is used to select various shift states of the gear set for shifting, it is prevented that the gear set is immediately switched from the forward shift state to the reverse shift state. Accordingly, generation of abnormal noise and breakage of the gear set are prevented.

[0008]

By the way, in the above-mentioned conventional technique, as described above, the operation of the operation lever causes
When an attempt is made to suddenly switch from the forward shift state to the reverse shift state, the first engagement arm that rotates together with the first rotating body comes into pressure contact with the base of the second engagement arm, and the first rotating body rotates. Further rotation is prevented, so that the switching is prevented.
The second rotating bodies are located close to each other, and extend from a first axis, which is a center of rotation of the first rotating body, to a press-contact portion of the first engagement arm to a base of the second engagement arm. The dimensions are short.

For this reason, the dimensional accuracy when the further rotation of the first rotating body is prevented is hardly accurate because the dimension reaching the press contact portion is short. When the operation lever moved forward is prevented from moving backward beyond the neutral position by preventing the rotation of the first rotating body, the operation lever is accurately stopped at a predetermined neutral position. Therefore, there is a possibility that an operational inconvenience may occur, for example, such that a smooth operation when trying to move the operation lever in the vehicle width direction is hindered thereafter.

Further, as described above, when the first engagement arm that rotates together with the first rotation body comes into pressure contact with the base of the second engagement arm, this pressure contact is made by a spring (reference numeral 6 in the above publication).
Except for the pressure contact portions of 3), the pressure contact is performed in a small area by line contact, and stress concentration tends to occur in a part of the pressure contact portion.

For this reason, when the operation of the operation lever is repeated, plastic deformation or breakage due to stress concentration occurs in a part of the press contact portion, and further rotation of the first rotating body is prevented. When the operation lever is accurately and repeatedly stopped at the predetermined neutral position, there is a possibility that a problem in service life may occur.

The present invention has been made in view of the above-mentioned circumstances, and is intended to prevent the operation lever moved backward in front of the neutral position from moving backward beyond the neutral position. An object of the present invention is to enable an operation lever to be accurately stopped at a predetermined neutral position, and thereafter to smoothly operate the operation lever when trying to move the operation lever in the vehicle width direction. .

[0013] Another object of the present invention is to improve the life of accurately stopping the operation lever at a predetermined neutral position repeatedly as described above.

[0014]

According to the present invention, there is provided a vehicle gear transmission having a mechanism for preventing reverse switching of a reverse gear, which reciprocates an operating lever 11 forward and backward from a neutral position N. When the operation lever 11 is moved back and forth from the neutral position N toward the front G from the neutral position N, the operation lever 11 is moved back and forth from the neutral position N toward the vehicle width direction. The gear set 2 interlocked with the lever 11 via the first rotating body 8 is set to the forward shift state S5, while the operation lever 11 is moved to the neutral position N.
When the actuator is moved backward from
So that the gear set 2 interlocked via the first rotating body 8 is in the reverse speed change state R,

When the operation lever 11 moved backward H in front of the neutral position N is to be moved backward beyond the neutral position N while maintaining the direction of the backward movement H, the operation lever 11 is In a reverse gear change prevention mechanism for a vehicle gear transmission provided with a blocking means 19 for blocking backward movement,

The blocking means 19 includes a second rotating body 22 provided near the first rotating body 8 and a first rotating body 8.
The first engaging arm 26 protruding from the second rotating body 2
2, the first rotating body 8 protruding from the first rotating body 8 and rotating together with the first rotating body 8.
2nd engagement arm 2 which removably engages with the engagement arm 26
7 and a stopper arm 28 protruding from the second rotating body 22. When the operation lever 11 is to be moved rearward beyond the neutral position N from the front of the neutral position N, the stopper The protruding end of the arm 28 abuts against a part 30 of the vehicle body stationary side member 5, and the first engagement arm 26 that rotates together with the first rotating body 8 presses against the second engagement arm 27, Further rotation of the first rotating body 8 is prevented,

With the projecting end of the stopper arm 28 in contact with a part 30 of the vehicle body stationary side member 5, each of the press contact surfaces 26 of the first and second engagement arms 26, 27 which press against each other.
a, 27a are in surface contact with each other.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

In FIGS. 2 to 5, reference numeral 1 denotes a gear transmission supported on the body of an automobile. The gear transmission 1 receives the power of the engine to shift the speed, and transmits the speed to driving wheels for traveling. The arrow Fr indicates the front in the forward direction of the vehicle, and the left and right described below refer to the vehicle width direction toward the front.

The gear transmission 1 includes a transmission case supported on the vehicle body, a transmission gear set 2 included in the transmission case, and various desired gear sets 2 operated by a driver. And a shift operation mechanism 3 for switching to a shift state.

The transmission operation mechanism 3 will be described. A first pivot 6 is supported by a stationary body member 5 such as the vehicle body or the transmission case, and the first pivot 6 is rotated about a first axis 7 substantially perpendicular to the first pivot 6. A first rotating body 8 having a cylindrical shape is pivotally supported on the first pivot 6 so as to be rotatable. A pair of upper and lower springs 9 is provided for urging the first rotating body 8 to be positioned at a middle portion in the axial direction of the first pivot 6.

An operation lever 11 for shifting operation is provided which protrudes upward from the vehicle body stationary side member 5 side, and a lower portion of the operation lever 11 is pivotally supported by the vehicle body stationary side member 5 to operate an upper side thereof. The part is movable (rotated) in the front-rear direction and the vehicle width direction. The vehicle body stationary side member 5 is provided with an indicator plate 12 for indicating the gear shifting state of the gear set 2, and a midway in the longitudinal direction of the operation lever 11 passes through a slot 13 formed in the indicator plate 12. I have.

When the operating lever 11 is located at the center of the slot 13 in the front-rear direction in plan view, the operating lever 11 is located at the neutral position N. Further, at the neutral position N, the operation lever 11 is movable in the vehicle width direction (selection direction), and the operation lever 11 is located at the center of the slot 13 in the vehicle width direction at the neutral position N. 2 (shown in FIG. 2), if it moves to the left (arrow A), it will be located at the neutral position N on the left side, and if it moves to the right (arrow B), it will be at the neutral position N on the right.
In the free state in which the operation lever 11 is located at the neutral position N, the operation lever 11 is automatically positioned at the neutral position N at the central portion by the urging force of a spring.

The operation lever 11 is reciprocally movable (shift direction) forward and backward from each of the neutral positions N. More specifically, the operation lever 11 is free to move forward and backward (arrows C and D) from the neutral position N on the left side and to the rear (arrows C and D).
D). The operation lever 11
Is movable forward (arrows E and F) from the neutral position N in the center toward the front and rear directions, and freely movable (arrows E and F).
And the opposite direction). Further, the operation lever 11 can freely move forward from the right neutral position N (arrow G).
It is free to move back (arrow H), is free to move backward (arrow I), and is free to move backward (in the direction opposite to arrow I).

The gear set 2 is operatively connected to the first rotating body 8 via interlocking means 15, and the first rotating body 8 is operatively connected to the operating lever 11 via other interlocking means 16. ing. When the operating lever 11 is moved forward or backward from the neutral position N toward the front or the rear, the operating lever 11 is interlocked with the first rotating body 8 via the interlocking means 15 and 16. The gear set 2 is the first
To the fifth speed (indicated by S in FIGS. 2 and 4).
1 to S5), and when the operating lever 11 is moved backward I from the neutral position N on the right side, the first rotating body 8 and the interlocking means 15,
The gear set 2 that is interlocked with the gear set 16 is switched to a reverse speed change state (reference numeral R in FIGS. 2 and 4).

When the operation lever 11 moved backward H in front of the neutral position N on the right side is to be directly moved backward beyond the neutral position N while maintaining the direction of the movement H, A blocking means 19 for blocking the backward movement of the operation lever 11 is provided.

The blocking means 19 has a second pivot 20 which is supported by the body stationary side member 5 in the vicinity of the first rotating body 8, and a second axis 20 which is substantially perpendicular to the second pivot 20. 2
A cylindrical second rotating body 22 is pivotally supported on the second pivot 20 so as to be rotatable around one direction. A spring 23 is provided for urging the second rotating body 22 to be positioned at a lower end side, which is one end side in the axial direction of the second pivot 20, and the spring 23 is provided with the second rotating body 22. Is biased so as to be located in a part of the second axis 21 in the circumferential direction in its free state (shown by solid lines in FIGS. 2 and 4).

The first rotating body 8 is provided with a first engagement arm 26 projecting outward in the radial direction, and is provided with the first rotating body 8 around the first axis 7. A second engaging and disengaging engagement with the rotating first engagement arm 26
An engagement arm 27 is provided so as to project radially outward from the second rotating body 22. Further, a stopper arm 28 is provided on the second rotating body 22 so as to project outward in the radial direction as a separate body from the second engagement arm 27, and the stopper arm 28 is provided with the second engagement arm 27. It is projected to be sufficiently longer than the joint arm 27.

2 and 3, the solid line in each figure shows the initial state in which the operation lever 11 is located at the neutral position N at the center.

In the initial state, the second engagement arm 27 is moved from the first engagement arm 26 in the axial direction of the first and second shaft centers 7 and 21, as indicated by solid lines in FIG. From the initial state, when the operation lever 11 is moved leftward A to the neutral position N on the left side, when the operation lever 11 is moved to the neutral position N via the interlocking means 16, the first engagement member 11 is engaged with the first rotating body 8. The arm 26 moves downward in conjunction therewith, and the second engagement arm 27 is moved in the axial direction of the first and second shaft centers 7 and 21 by the first engagement arm 27.
It will be farther away from the engagement arm 26 (FIG. 3).
Middle dot-dash line).

For this reason, the operating lever 11 is moved forward and backward from the neutral position N on the left side in the forward and backward directions, and the first rotating body 8 and the first engaging arm 26 are connected to the operating lever 11 via the interlocking means 16. Are interlocked with each other, the first engagement arm 26 does not come into contact with the second engagement arm 27, but rotates around the first shaft center 7, and the gear set 2 , The second speeds S1 and S2 are set in the forward speed change state.

Further, as described above, the operating lever 11 is positioned at the neutral position N in the central portion to be in the above-described initial state, and the operating lever 11 is moved forward and backward from the neutral position N in the central portion. When the first rotating body 8 and the first engagement arm 26 are interlocked with the first engagement arm 26 via the interlocking means 16, the first engagement arm 26 comes into contact with the second engagement arm 27. Without rotating around the first axis 7,
Through the interlocking means 15, the gear set 2 is shifted to the third and fourth speeds S3,
The forward shift state of S4 is set.

The solid lines in FIG. 4 correspond to FIGS.
In the same manner as shown in the above, the initial state where the operation lever 11 is located at the neutral position N in the center is shown. In this case,
The first engagement arm 26 and the second engagement arm 27 overlap in the vertical direction.

When the operating lever 11 is moved rightward B from the initial state to the neutral position N on the right side,
In addition to the first rotating body 8 via the interlocking means 16,
The engagement arm 26 moves upward in conjunction with it (arrow J in FIG. 5). Then, the upper surface of the first engagement arm 26 comes into contact with the lower surface of the second engagement arm 27, and the second engagement arm 27 is pushed up by the first engagement arm 26 to oppose the spring 23. However, it rises together with the second rotating body 22 and the stopper arm 28 (shown by a solid line in FIG. 5).

From this state, the operating lever 11 is moved forward G from the right neutral position N, and the first rotating body 8 is interlocked therewith via the interlocking means 16, so that the first rotating body 8 is moved. When the gear set 2 is rotated about the first axis 7, the gear set 2 is brought into the forward speed change state of the fifth speed S5 via the interlocking means 15.

In the above case, the first engagement arm 26 also rotates about the first axis 7 together with the first rotating body 8, but at this time, the first engagement arm 26 is Sliding with respect to the lower surface of the joint arm 27 in the circumferential direction around the first axis 7, when viewed from the line of sight along the axial direction of the first and second axes 7 and 21 (in plan view), The second engagement arm 27 is separated from the second engagement arm 27 (the first engagement arm 26 shown by a two-dot chain line in FIG. 4 and the second engagement arm 27 shown by a solid line).

For this reason, the above-mentioned contact of the first engagement arm 26 with the second engagement arm 27 is released, and the second engagement arm 27 is accompanied by the second rotating body 22 and the stopper arm 28. , Is moved below the original position by the urging force of the spring 23. At this time, the second engagement arm 27 is positioned at the same position with respect to the first engagement arm 26 in the axial direction (vertical direction) of the first and second shaft centers 7 and 21. (A dashed line in FIG. 5).

In FIGS. 1, 4 and 5, from the above state, the operating lever 11 is moved back H in front of the right neutral position N and returned to the neutral position N. The first rotating body 8 and the first engagement arm 26 are linked to each other, and the first engagement arm 26 engages with the second engagement arm 27, and the second engagement arm 27 The first rotating arm 22 and the stopper arm 28 are rotated by the 1 engaging arm 26 against the torsional biasing force of the spring 23 (the first engaging arm 26 indicated by a solid line in FIG. 4).
The stopper arm 28 indicated by a two-dot chain line in FIGS.

When the operation lever 11 is to be further moved backward beyond the neutral position N on the right side from the above state, the projecting end of the stopper arm 28 which rotates as described above is connected to the vehicle body stationary side member 5. Abuts on part 30 of
The first engaging arm 26 that rotates together with the first rotating body 8 is pressed against the second engaging arm 27 engaged with the first rotating body 8, and further rotating of the first rotating body 8 (FIG. K in 1)
Are prevented (solid line in FIG. 1).

For this reason, the fact that the operating lever 11 moves forward (FIG. 2) from the neutral position N to the rear beyond the neutral position N on the right side means that the first rotary body 8 rotates. This is prevented by the inhibition, that is, when it is intended to select various shift states of the transmission gear set 2 by a shift operation to the operation lever 11, the gear set 2 is moved forward in the forward shift state S5
Is prevented from being suddenly switched to the reverse shift state R, generation of abnormal noise in the gear set 2,
Damage will be prevented.

Here, the dimensional accuracy when the further rotation of the first rotating body 8 is prevented is such that the protruding end of the stopper arm 28 is in contact with the part 30 of the vehicle body stationary side member 5. However, since the size of the protrusion of the stopper arm 28 is determined irrespective of whether the first and second rotating bodies 8 and 22 are provided near each other, This protrusion dimension can be made sufficiently long.

Accordingly, by making the projecting dimension of the stopper arm 28 sufficiently long, the dimensional accuracy when the further rotation of the first rotary body 8 is prevented is further improved, and this is achieved. Therefore, in order to prevent the operation lever 11 moved back H in front of the neutral position N from moving backward beyond the neutral position N, the operation lever 11 is accurately stopped at the predetermined neutral position N. Therefore, after that, the operation when the operation lever 11 is to be moved in the vehicle width direction can be smoothly performed.

In a state where the protruding end of the stopper arm 28 is in contact with the part 30 of the vehicle body stationary side member 5, each of the first and second engagement arms 26 and 27, which are pressed against each other, are substantially perpendicular to each other. The press contact surfaces 26a, 27a are in surface contact with each other, so that stress concentration on a part of each press contact surface 26a, 27a of the first and second engagement arms 26, 27 is prevented. Thereby, even if the first and second engagement arms 26 and 27 have a large pressure contact force, plastic deformation or loss due to stress concentration on a part of the pressure contact surfaces 26a and 27a is prevented. You.

Therefore, the dimensional accuracy when the further rotation of the first rotating body 8 is prevented can be maintained satisfactorily for a longer period, which is advantageous in terms of life.

On the other hand, as described above, when the operating lever 11 is moved back H in front of the neutral position N on the right side and returned to the neutral position N (the first engagement arm 2 indicated by a solid line in FIG. 4).
6, once the operation lever 11 is moved to the left from the second engagement arm 27 and the stopper arm 28 indicated by the two-dot chain line in FIGS.
The first rotating body 8 and the first engaging arm 26 are interlocked with the first engaging arm 26 via the interlocking means 16 with the pressing surface 2 of the first engaging arm 26.
6a slides downward on the press contact surface 27a of the second engagement arm 27, and when the operation lever 11 reaches the neutral position N of the central portion, the first engagement with the second engagement arm 27 is performed. The engagement (pressure contact) of the arm 26 is released, and the speed change operation mechanism 3 returns to the initial state (solid line in FIGS. 2 and 3).

When the operation lever 11 is moved rightward B from the initial state to the neutral position N on the right side,
As described above, the first engagement arm 26 moves together with the first rotating body 8 via the interlocking means 16 to move upward.
Then, the second engaging arm 27 is pushed by the interlocking means 16 and rises with the second rotating body 22 and the stopper arm 28 against the spring 23 (shown by a solid line in FIG. 5).

In this state, when the operation lever 11 is moved backward I from the right-hand neutral position N, the first rotating body 8 is interlocked therewith via the interlocking means 16, and the first rotating body 8 is moved. The first engagement arm 26, which rotates about the first axis 7 together with the lower surface of the second engagement arm 27, slides in the circumferential direction around the first axis 7 so as to be neutral on the right side. The rearward movement of the operation lever 11 from the position N is allowed. The operation lever 11 is connected to the first lever through the interlocking means 16.
The rotating body 8 is linked with the gear set 2 via the linking means 15.
Is set to the reverse shift state R.

In the above case, since the pressing state of the upper surface of the first engaging arm 26 against the lower surface of the second engaging arm 27 is maintained, the operating lever 11 is returned to the rear of the neutral position N on the right side. When moved (in the direction opposite to I), the first engagement arm 26 slides on the lower surface of the second engagement arm 27 in the opposite direction, and returns to the neutral position N on the right side. .

[0049]

According to the present invention, the operating lever is reciprocally movable forward and backward from the neutral position, and reciprocally movable from the neutral position in the vehicle width direction. When the operation lever is moved forward from the neutral position, the gear set that is interlocked with the operation lever via the first rotating body is set to a forward shift state, and the operation lever is moved from the neutral position. When forwardly moving backward, the gear set interlocked with the operation lever via the first rotating body is set to a reverse shift state,

When the operation lever moved backward in front of the neutral position is to be moved backward beyond the neutral position in the direction of the backward movement, the operation lever is prevented from moving backward. In a reverse gear change prevention mechanism for a vehicle gear transmission provided with a means,

The blocking means is provided with a second rotating body provided in the vicinity of the first rotating body, a first engaging arm projecting from the first rotating body, and a projection provided on the second rotating body. The first
A second engaging arm that is removably engaged with the first engaging arm that rotates together with the rotating body; and a stopper arm that protrudes from the second rotating body. When the operating lever is to be moved rearward beyond the neutral position, the first engaging portion that rotates together with the first rotating body, with a projecting end of the stopper arm abutting against a part of the vehicle body stationary side member. The arm is pressed against the second engagement arm so that further rotation of the first rotating body is prevented.

Therefore, the movement of the operating lever beyond the neutral position and moving backward from the neutral position is prevented by the above-described rotation inhibition of the first rotating body. When various gear shifting states of the gear set for gear shifting are selected by the operation, the gear set is prevented from being suddenly switched from the forward gear shifting state to the reverse gear shifting state. , Damage is prevented.

Here, the dimensional accuracy when the further rotation of the first rotating body is prevented is determined in a state where the protruding end of the stopper arm is in contact with a part of the vehicle body stationary side member. However, since the protrusion dimension of the stopper arm is determined irrespective of whether the first and second rotating bodies are provided near each other, the protrusion dimension is set to be sufficiently long. be able to.

Therefore, by making the protrusion dimension of the stopper arm sufficiently long, the dimensional accuracy when the further rotation of the first rotating body is prevented is further improved, and therefore, When preventing the operation lever moved backward in front of the neutral position from moving backward beyond the neutral position, the operation lever can be accurately stopped at the predetermined neutral position, and thereafter, Thus, the operation when the operation lever is to be moved in the vehicle width direction can be smoothly performed.

Further, in a state where the protruding end of the stopper arm is in contact with a part of the vehicle body stationary side member, the respective pressure contact surfaces of the first and second engagement arms which press against each other are brought into surface contact with each other. is there. For this reason, stress concentration is prevented from being generated on a part of each pressure contact surface of the first and second engagement arms, so that even if the first and second engagement arms have a large pressure contact force with each other. This prevents plastic deformation and loss due to stress concentration on a part of the press contact surface.

Therefore, the dimensional accuracy when the further rotation of the first rotating body is prevented can be favorably maintained for a longer period of time, that is, the operation lever is accurately and repeatedly stopped at the predetermined neutral position. The service life in performing the operation is improved.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining the operation, and is a diagram corresponding to a part of FIG. 4;

FIG. 2 is an overall plan view.

FIG. 3 is a sectional view taken along line 3-3 of FIG. 2;

FIG. 4 is a diagram for explaining the operation and is a diagram corresponding to FIG. 2;

FIG. 5 is a sectional view taken along line 5-5 in FIG. 4;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 gear transmission 2 gear set 3 shift operation mechanism 5 body stationary side member 7 first axis 8 first rotating body 11 operating lever 19 blocking means 21 second axis 22 second rotating body 26 first engaging arm 26a pressure contact Surface 27 Second engagement arm 27a Pressure contact surface 28 Stopper arm 30 Part N Neutral position

Claims (1)

[Claims] An operation lever is reciprocally movable in a forward and rearward direction from a neutral position, and is reciprocally movable in a vehicle width direction from the neutral position. The gear set that is interlocked with the operation lever via the first rotating body is set in a forward shift state when the operation lever is moved forward from the front, while the operation lever is moved backward from the neutral position toward the rear. When this is done, the gear set that is interlocked with the operation lever via the first rotating body is brought into a reverse speed change state, and the operation lever that has been moved backward in front of the neutral position remains in the direction of its movement. Then, when trying to move backward beyond the neutral position, in a reverse gear change prevention mechanism for a vehicle gear transmission provided with a blocking means for blocking the backward movement of the operation lever, A second rotating body provided in the vicinity of the first rotating body, a first engagement arm protruding from the first rotating body, and rotating together with the first rotating body protruding from the second rotating body. A second engaging arm that is removably engaged with the first engaging arm.
An engagement arm and a stopper arm protruding from the second rotating body, when the operation lever is to be moved rearward beyond the neutral position from the front of the neutral position;
The protruding end of the stopper arm abuts a part of the vehicle body stationary side member, the first engagement arm that rotates together with the first rotating body presses against the second engagement arm, and the first rotating body And further pressing surfaces of the first and second engaging arms which are pressed against each other in a state where the protruding end of the stopper arm is in contact with a part of the vehicle body stationary side member. A reverse gear change prevention mechanism for an automotive gear transmission in which the gears are in surface contact with each other.