JPH0842688A - Shift operation mechanism for transmission - Google Patents

Abstract

PURPOSE:To simplify constitution by a method wherein a spring is provided for returning a shift and select lever, moved through select operation of a change lever, to a neutral position and a positioning function to return a cam moved through operation of a change lever is provided for a spring. CONSTITUTION:An outer lever 40 communicated with a change lever is provided and the outer lever 40 is arranged in such a state to be communicated with a shift and select lever 38 through a shift and select shaft 42 connected to one end side of the outer lever. A return spring 46 being a spring through the force of which the shift and select lever 38 moved through select operation of the change lever is returned to a neutral position is provided. l Further, a cam 48 is located between the return spring 46 and the shift and select lever 38 and the return spring 46 is provided with a positioning function to return the cam 48, moved through operation of the change lever, to a given position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shift operation mechanism for a transmission, and more particularly to a shift operation mechanism for a transmission that reliably positions a shift and select lever and a cam.

[0002]

2. Description of the Related Art An automobile is provided with a manual transmission or an automatic transmission as a power transmission mechanism for converting a driving force from a mounted internal combustion engine into a desired state according to a running condition and taking out the driving force.

A manual transmission is generally called a gear transmission, and this gear transmission has a plurality of transmission gear trains such as an input gear train, a first gear train to a fifth gear train, and a reverse gear train. The drive force of the internal combustion engine input via the input shaft is shifted to a predetermined state by meshing a desired gear train. The wheels are driven via the output shaft by the changed driving force.

As a shift operation mechanism for the transmission, there is one disclosed in Japanese Patent Publication No. 54-23060.
The transmission operation mechanism of the transmission disclosed in this publication prevents the shift lever from moving from the neutral position to the reverse position by the stopper means when releasing the forward shift position that is on the same straight line as the reverse position. Only the shift to the forward gear is possible and the misshift to the reverse gear is completely prevented.

Further, there is one disclosed in Japanese Patent Publication No. 62-14451. A misshift prevention device for a gear shift operation mechanism in a multi-speed transmission disclosed in this publication controls a support that supports an engagement member in a gear shift operation mechanism in which one forward gear and one reverse gear are arranged on the same shift operation line. The control body is supported between the control body and the support so as to be movable and rotatable in the same direction as the movement direction of the engagement member and regulates the rotation range of the control body. At the original position on the side opposite to the direction of movement to the forward / backward shift operation line, and in addition to urging in the rotation direction approaching the engaging member, the engaging member is provided with a projection, When moving to the forward shift operation line, the control body is driven by engaging with the projection, and when the engaging member is swung to the forward shift position on the forward and backward shift operation line, the control body is moved to the original position. When returning, an engaging protrusion that overlaps the protrusion was provided Thereby preventing over shift to Susumudan shift positions, and a good assembling workability.

Further, there is one disclosed in Japanese Utility Model Publication No. 57-39661. In the gear shift operation device for a gear transmission disclosed in this publication, an arm for gear shift operation is engaged with a cam plate arranged at an engagement position with a shift shaft for forward / reverse movement, whereby the arm moves forward / backward. It is not possible to tilt the shift lever from the forward position directly to the reverse reverse side by forming a groove that restricts displacement of the reverse shift shaft from the forward side to the reverse side. Is surely prevented.

Further, there is one disclosed in Japanese Utility Model Laid-Open No. 5-57512. The mis-shift prevention mechanism for a transmission disclosed in this publication allows a restrict lever (30) to be freely aligned and axially moved on a shaft (12) extending in parallel with a shift shaft (1) installed on a case (2). The lever (30) is provided with an engaging piece that axially faces the protrusion (20) and that engages with the protrusion (20) when the hawk shift lever (3) moves on the shift operation line. , The lever (30) is urged in the same direction as the direction in which the engagement piece axially engages the projection (20) and the rotation direction of the lever (3) in the forward step direction on the shift operation line. A spring (40) is provided to allow the lever (3
0) faces the end surface of the bearing portion (5) of the select shaft and faces the first restricting surface that restricts the rotation of the lever (30) by the spring (40) and the outer peripheral surface of the select inner lever (6). The spring (40) lever (3
The restriction piece (50) having the second restriction surface (52) for restricting the axial movement of (0) is provided to restrict the rotation and the axial movement of the restrict lever to stably move the transmission. .

[0008]

A shift operation mechanism of a conventional transmission will now be described. In FIG. 13, 102 is a manual transmission. The transmission 102 has an input shaft 106, a counter shaft 108 serving as a driving side shaft, an output shaft 110 serving as a driven side shaft, and a reverse idler shaft 112 supported in a transmission case 104.

The input shaft 106 and the output shaft 110
Are connected so that they have the same center of rotation, and the input shaft 10
The counter shaft 108 is arranged parallel to the output shaft 6 and the output shaft 110. A plurality of transmission gear trains 114 are provided between the shafts 106 to 112. This plurality of transmission gear trains 1
14 includes an input gear train 116, a first speed gear train 118 to a fifth speed gear train 124, and a reverse gear train 126.

A first speed gear train 118 and a second speed gear train 12 are also provided.
A first speed / second speed switching mechanism 128 is provided between the third speed gear train 122 and the third speed gear train 122, and a third speed / fourth speed switching mechanism 132 is provided between the third speed gear train 122 and the shaft end 130 of the input shaft 106. Row 1
A fifth speed / reverse switching mechanism 134 is provided between the gear 24 and the reverse gear train 126.

The first speed / second speed switching mechanism 128 selectively switches the meshing state of the first speed gear train 118 and the second speed gear train 120. The third-speed / fourth-speed switching mechanism 132 includes a meshed state of the third-speed gear train 122, the input shaft 106, and the driven-side shaft 110.
And the connection state of are selectively switched. The fifth speed / reverse switching mechanism 134 selectively switches the meshing state of the fifth speed gear train 124 and the reverse gear train 126.

These first speed / second speed switching mechanism 128 and third speed /
The fourth speed switching mechanism 132 and the fifth speed / reverse switching mechanism 134 are
Switching operation is performed by the shift shaft group 136. A lever protrusion provided on one end of a remote control shaft (not shown) is selectively engaged with a shift yoke group (not shown) provided on each of the shift shaft groups 136, and the other end of the remote control shaft is changed. The lever is connected to a shift and select lever 138 (not shown) (see FIG. 1).
4 and FIG. 15).

Further, as shown in FIGS. 14 and 15, the outer lever 1 is connected to the change lever (not shown).
40 is provided, and the shift and select lever 138 is provided in communication with the outer lever 140 via a shift and select shaft 142 connected to one end side.

The shift and select lever 138 is rotated in the same direction with respect to the outer lever 140 by a shift operation of a change lever (not shown), and the shift and select lever 138 is moved by the select operation of the change lever. It reciprocates in the axial direction of the select shaft 142.

The shift and select shaft 142
Is pivotally supported in the lever case 144, and the shift and select lever 138 is arranged on the outer peripheral portion of the shift and select shaft 142.

A hole 170 is formed in the lever case 144, and a check ball 172 for restricting the operation of the shift and select lever 138 at the time of reverse operation is provided in the hole 170, and a support bolt 176 is provided via a spring 174. Support.

Further, a reverse shift limit member 178 is provided on the outer periphery of the shift and select shaft 142 and on one end side portion of the shift and select lever 138, and the first return spring 146 for returning the shift limit member 178 to a predetermined position. Is provided
At the outer periphery of the shift and select shaft 142 and the other end side portion of the shift and select lever 138, the second return spring 16 is provided via a spring support body 166.
8 is provided.

A stopper rib 180 is provided in the lever case 144 and at one end side portion of the shift and select lever 138 so as to project inward and contact the shift limit member 178. At this time, the urging force of the first return spring 146 acts on the return operation of the shift and select lever 138, but at the neutral position, the shift limit member 178 is attached to the stopper rib 180.
Is not working to contact.

A supporting rib 182 for supporting the spring supporting member 166 is also formed inside the lever case 144 and at the other end side portion of the shift and select lever 138.

As a result, the first return spring does not have a positioning function for returning the shift limit member 178 to a predetermined position, and it is necessary to perform positioning by other parts,
There is an inconvenience that the other functions cannot be added to one component and the configuration becomes complicated.

Further, since it is not possible to add another function to one part, there is a large space for disposing each part, which is disadvantageous in practical use, and the number of parts to be formed makes it possible to manufacture. It is difficult, costly, and economically disadvantageous.

[0022]

Therefore, in order to eliminate the above-mentioned inconvenience, the present invention provides an outer lever that communicates with a change lever, and a shift and select shaft via a shift and select shaft having the outer lever connected to one end side. By connecting the levers, the shift and select lever is rotated in the same direction as the outer lever by the shift operation of the change lever, and the shift and select lever is reciprocated in the axial direction of the shift and select shaft by the select operation of the change lever. In the transmission, a spring for returning the shift-and-select lever moved by the select operation of the change lever to the neutral position is provided, and a cam is provided between the spring and the shift-and-select lever for setting the change relay. The positioning function to return the cam to be moved by over operation to a predetermined position, characterized in that a structure to be added to the spring.

Further, an outer lever for connecting to the change lever is provided, and the shift and select lever is connected through a shift and select shaft having one end connected to the outer lever. In the transmission in which the shift and select lever is reciprocally moved in the axial direction of the shift and select shaft by rotating the shift and select lever in the same direction, the shift and select lever is moved by the select operation of the change lever. Is provided with a spring for returning the gear to the neutral position, a cam is provided between the spring and the shift and select lever, and a lever case surrounding the shift and select lever is provided. The inside scan, characterized in that a rib also serves the positioning of the shift-and-select lever with contacting the cam is biased by a projecting the spring to the shift-and-select lever side performs positioning of the cam.

Further, an outer lever for connecting to the change lever is provided, and the shift and select lever is connected via a shift and select shaft having this outer lever connected to one end side. In the transmission in which the shift and select lever is reciprocally moved in the axial direction of the shift and select shaft by rotating the shift and select lever in the same direction, the shift and select lever is moved by the select operation of the change lever. Is provided with a spring for returning the gear to the neutral position, a cam is provided between the spring and the shift and select lever, and a lever case surrounding the shift and select lever is provided. A rib that protrudes toward the shift and select lever is provided in the space, and a first positioning portion that surrounds the outer peripheral portion of the shift and select lever and has a positioning function for the cam and a neutral positioning function for the shift and select lever is provided. The rib is formed by a second positioning portion that is located closer to the lever case than the first positioning portion and that projects toward the spring.

Furthermore, an outer lever for connecting to the change lever is provided, and the shift and select lever is connected through a shift and select shaft having this outer lever connected to one end side. In a transmission in which the shift and select lever is reciprocally moved in the axial direction of the shift and select shaft by rotating the shift and select lever in the same direction, the shift and select that is moved by the select operation of the change lever. A spring for returning the lever to the neutral position is provided, a cam is provided between the spring and the shift and select lever, and a lever case surrounding the shift and select lever is provided. A rib is provided in the case that projects to the shift and select lever side and contacts the cam biased by the spring to position the cam and also to position the shift and select lever. A bar member that connects the rib and the lever case in parallel is provided,
The rod member is provided with a moving member that slidably restrains a part of the rotation of the cam, and a restraining spring that biases the moving member to contact the rib.

[0026]

With the invention as described above, the cam is returned to the predetermined position by the spring for returning the shift-and-select lever, which is moved by the select operation of the change lever of the transmission, to the neutral position, and the reliable positioning is achieved.

Further, the cam and the shift and select lever are positioned by a rib formed in the lever case of the transmission.

Furthermore, a rib surrounds the outer peripheral portion of the shift and select lever and has a first positioning portion having a cam positioning function and a neutral positioning function of the shift and select lever, and is located closer to the lever case than the first positioning portion. In addition, the rib is formed by the second positioning portion protruding toward the spring side, the structure of the rib is simplified, the manufacturing is easy, and the cost is kept low.

Furthermore, a rod member that is parallel to the shift and select shaft of the transmission and connects the lever case and the rib, and a mover that slidably moves on the rod member and restrains a part of the rotation of the cam. , The restraining spring that urges the mover to come into contact with the rib realizes one component and multiple functions, reduces the number of components, reduces the layout space, and downsizes the transmission. The shape of parts is simplified.

[0030]

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

1 to 12 show an embodiment of the present invention. In FIG. 1, reference numeral 38 is a shift and select lever of a change lever (not shown).

First, the shift operation mechanism of the transmission (not shown) will be described without being shown. In the manual transmission, an input shaft, a drive shaft, a counter shaft, and a driven shaft are provided in the transmission case. The output shaft and the reverse idler shaft are pivotally supported.

Then, the input shaft and the output shaft are provided so as to communicate with each other so as to have the same rotation center, and the counter shaft is arranged parallel to the input shaft and the output shaft. A plurality of transmission gear trains are provided between these shafts. The plurality of speed change gear trains include an input gear train, a first speed gear train to a fifth speed gear train, and a reverse gear train.

Between the first speed gear train and the second speed gear train,
A first speed / second speed switching mechanism is provided, a third speed / fourth speed switching mechanism is provided between the third speed gear train and the shaft end of the input shaft, and a fifth speed gear train and a reverse gear train are provided. A 5-speed / reverse switching mechanism is provided.

The first speed / second speed switching mechanism selectively switches the meshing state of the first speed gear train and the second speed gear train. 3rd speed
The fourth speed switching mechanism selectively switches between the meshed state of the third speed gear train and the connected state of the input shaft and the driven side shaft. The fifth speed / reverse gear switching mechanism selectively switches the meshing state of the fifth speed gear train and the reverse gear train.

The first speed / second speed switching mechanism, the third speed / fourth speed switching mechanism, and the fifth speed / reverse speed switching mechanism are switched by a shift shaft group. A lever protrusion provided at one end of a remote control shaft (not shown) is selectively engaged with the shift yoke group provided in each of the shift shaft groups,
The other end of the remote control shaft is connected to the shift and select lever 38 of the change lever.

Further, as shown in FIG. 1, an outer lever 40 that communicates with the change lever (not shown) is provided, and the shift and select lever 42 is connected via a shift and select shaft 42 that is connected to one end of the outer lever 40. 38 to be provided by contacting.

Then, the shift and select lever 38 is rotated in the same direction with respect to the outer lever 40 by a shift operation of a change lever (not shown), and
The shift and select lever 38 is moved to the shift and select shaft 4 by selecting the change lever.
It reciprocates in the axial direction of 2.

The shift and select shaft 42 is pivotally supported in the lever case 44, and the outer peripheral portion of the shift and select shaft 42 and the lever case 44 are
The shift and select lever 38 is provided.

Shift and select lever 3 which is moved by the select operation of the change lever (not shown)
The first spring, which returns 8 to the neutral position
A return spring 46 is provided, a cam 48 is provided between the first return spring 46 and the shift and select lever 38, and a positioning function for returning the cam 48 moved by the operation of the change lever (not shown) to a predetermined position is provided. It is configured to be added to the first return spring 46.

Further, a cam 48 that projects toward the shift and select lever 38 side and is biased by the first return spring 46 is brought into contact with the inside of the lever case 44 to achieve the positioning of the cam 48 and the shift and select lever 38. Ribs 50 are also provided to perform positioning of.

Further, the rib 50 surrounds the outer peripheral portion of the shift and select lever 38, and has a positioning function for the cam 48 and a neutral positioning function for the shift and select lever 38.
And a second positioning portion 54 which is located closer to the lever case 44 than the first positioning portion 52 and projects toward the first return spring 46.

Further, a rod member 56 which is parallel to the shift and select shaft 42 and connects the lever case 44 and the rib 50 is provided, and the rod member 56 is slidably movable to rotate the cam 48. A mover 58 for suppressing a part is provided, and the mover 58 is attached to the rib 50.
A restraining spring 60 is provided to urge it to come into contact with.

More specifically, the cam 48 is arranged on the shift and select shaft 42 between the first return spring 46 and the shift and select lever 38, and the function of fixing the neutral position by the cam 48 is added. At the same time, the diameters of the bar members 56 and the moving elements 58 standing in parallel are reduced.

Further, by adding the cam 48, the rod member 56, the mover 58, and the restraining spring 60, a fifth speed / reverse switching mechanism (not shown) is constructed.

The rod member 56 and the mover 58 can be formed in a cylindrical shape, and the mover 58 can be formed of, for example, a synthetic resin. The rod member 56 is configured to be press-fitted into the lever case 44 and the rib 50,
It can also be fixed using fixing bolts.

Further, as shown in FIG. 3, a groove portion 62 having a fan-shaped cross-sectional shape near the outer peripheral side of the cam 48 is formed in the cam 48, and the shift and select shaft 42 is formed in the groove portion 62. A rod-shaped pin 64 is fixed to the.

On the outer periphery of the cam 48, a claw portion 48 that protrudes toward the moving element 58 in order to suppress axial movement of the moving element 58.
a is formed.

The rib 50 is formed integrally with the lever case 44, and the cam 48 is brought into contact with the rib 50.
The positioning part 52 and the second positioning part 54 for contacting the mover 58 are respectively formed.

Reference numeral 66 is a spring support provided on the outer periphery of the shift and select shaft 42 and on the other end side portion of the shift and select lever 38, and 68 is a second return spring.

Next, the operation will be described.

As shown in FIG. 2, when the shift pattern is in the neutral position, the cam 48 is in contact with the first positioning portion 52 of the rib 50 and the urging force of the first return spring 46 causes the shift and shift. The select lever 38 is in contact with the cam 48.

When the shift pattern is selected from the neutral position to the fifth speed / reverse position as shown in FIG. 5, the shift and select lever 38 is moved by the axial movement of the shift and select shaft 42 as shown in FIG. Pushes the cam 48 to one end side (left side in FIG. 4), the cam 48 pushes the moving element 58, and the moving element 58 is moved to one end side.

Then, as shown in FIG. 8, when the shift operation is performed to the 5th speed position, the shift and select shaft 4 is moved.
2 rotates, and the pin 64 fixed to the shift and select shaft 42 also rotates.

At this time, the cam 4 is rotated by the rotation of the pin 64.
8, the claw portion 48a of the cam 48 is disengaged from the moving element 58, the restraining function of the moving element 58 is released, and the moving element 58 is axially moved by the biasing force of the restraining spring 60, as shown in FIG. It is moved and comes into contact with the second positioning portion 54 of the rib 50.

Further, when an attempt is made to perform a shift operation from the fifth speed position to the reverse (R) position, the claw portion 48a of the cam 48 is in contact with the outer periphery of the moving element 58, so that the shift operation of the shift and select shaft 42 is prevented. , The pin 64 is restrained only to move in the groove portion 62 in the cam 48, and the shift to the reverse (R) position is not performed.

By returning from the 5th speed position to the neutral position, the cam 48 causes the rib 50 to move to the first positioning portion 5 of the rib 50.
When the cam 48 and the mover 58 are disengaged from each other, the select and shift operations from the neutral position to the reverse position are possible.

As a result, the cam 48 can be returned to a predetermined position by the urging force of the first return spring 46, and reliable positioning can be achieved.

Further, since the rib 50 is provided,
The cam 48 and the shift and select lever 38 can be positioned, which is practically advantageous.

Further, since the rib 50 is formed by the first and second positioning portions 52 and 54, the structure of the rib 50 is simple, the manufacture is easy, the cost can be kept low, and it is economical. Is advantageous to.

Furthermore, by realizing one component and multiple functions like the rib 50, the number of components can be reduced and the layout space can be reduced.
The transmission can be miniaturized.

Further, since the shapes of the constituent parts can be simplified, the manufacture is easy, the cost can be reduced, and it is economically advantageous.

Furthermore, by making the most of the existing shape and making the change as small as possible, there is no fear that the configuration will be complicated, and it is practically advantageous.

[0064]

As described in detail above, according to the present invention, a spring for returning the shift and select lever moved by the select operation of the change lever of the transmission to the neutral position is provided, and the spring between the spring and the shift and select lever is provided. Since the cam has a cam and the positioning function to return the cam moved by the change lever operation to the predetermined position is added to the spring, the cam can be returned to the predetermined position by the urging force of the spring, and the positioning is ensured. Can be fulfilled.

Further, a lever case surrounding the shift-and-select lever of the transmission is provided, and a cam projecting toward the shift-and-select lever side and biased by a spring is brought into contact with the lever case to perform positioning of the cam and shift-and-select. Since the rib that also positions the select lever is provided, the cam and the shift and select lever can be positioned, which is practically advantageous.

Further, a first positioning portion that surrounds the outer peripheral portion of the shift and select lever of the transmission and has a cam positioning function and a neutral positioning function of the shift and select lever, and a lever case side of this first positioning portion. Since the rib is formed by the second positioning portion that is positioned and protrudes toward the spring side, the structure of the rib is simple, the manufacturing is easy, the cost can be kept low, and it is economically advantageous.

Furthermore, a rod member is provided which is parallel to the shift and select shaft of the transmission and which connects the lever case and the rib, and the rod member is slidably movable to restrain a part of the rotation of the cam. In addition to the above, a restraining spring for urging the slider to contact the rib is provided, so that the number of parts can be reduced and the layout space can be reduced by realizing one part and multiple functions. Therefore, the transmission can be downsized. Also, by simplifying the shape of the components,
It is easy to manufacture, can be manufactured at low cost, and is economically advantageous. Furthermore, since the existing shape can be used to the maximum and the change can be minimized, there is no fear that the configuration will be complicated, and it is practically advantageous.

[Brief description of drawings]

FIG. 1 is a schematic view of a shift and select shaft and a shift and select lever portion in a neutral position showing an embodiment of the present invention.

FIG. 2 is a schematic diagram of a shift pattern in a neutral position.

FIG. 3 is a left side view of a shift and select shaft and a shift and select lever portion in FIG.

FIG. 4 is a schematic view of a shift-and-select shaft and a shift-and-select lever portion in a select operation to the fifth speed and the reverse side.

FIG. 5 is a schematic diagram of a shift pattern in a select operation to the fifth speed and the reverse side.

FIG. 6 is a left side view of a shift and select shaft and a shift and select lever portion in FIG.

FIG. 7 is a schematic view of a shift and select shaft and a shift and select lever portion in a shift operation to a fifth speed.

FIG. 8 is a schematic diagram of a shift pattern in a shift operation to the fifth speed.

9 is a left side view of a shift and select shaft and a shift and select lever portion in FIG. 7. FIG.

FIG. 10 is a schematic view of a shift and select shaft and a shift and select lever portion in a shift operation from the fifth speed to the neutral.

FIG. 11 is a schematic diagram of a shift pattern in a shift operation from 5th speed to neutral.

12 is a left side view of a shift and select shaft and a shift and select lever portion in FIG.

FIG. 13 is a schematic sectional front view of a transmission showing a conventional technique of the present invention.

FIG. 14 is a schematic sectional front view of a shift and select shaft and a shift and select lever portion.

FIG. 15 is a schematic plan view of a shift and select shaft and a shift and select lever portion.

[Explanation of symbols]

 38 shift and select lever 40 outer lever 42 shift and select shaft 44 lever case 46 first return spring 48 cam 48a claw portion 50 rib 52 first positioning portion 54 second positioning portion 56 bar member 58 mover 60 restraining spring 62 groove portion 64 Pin 66 Spring support 68 Second return spring

[Procedure amendment]

[Submission date] October 4, 1994

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

FIG.

[Fig. 2]

[Figure 3]

[Figure 4]

[Figure 5]

[Figure 6]

[Figure 7]

[Figure 8]

[Figure 9]

[Figure 10]

FIG. 11

[Fig. 12]

FIG. 15

[Fig. 13]

FIG. 14

Claims (4)

[Claims] 1. An outer lever for communicating with a change lever is provided, and the shift and select lever is connected via a shift and select shaft having the outer lever connected to one end side, and the shift and select lever is shifted with respect to the outer lever by a shift operation of the change lever. In the transmission in which the shift and select lever is reciprocally moved in the axial direction of the shift and select shaft by rotating the shift and select lever in the same direction, the shift and select lever is moved by the select operation of the change lever. A spring is provided to return the neutral position to the neutral position, and a cam is provided between this spring and the shift and select lever to provide a positioning function to return the cam moved by the change lever operation to a predetermined position. A shift operation mechanism for a transmission, characterized in that it is added to the spring. 2. An outer lever that connects to the change lever is provided, and the shift and select lever is connected to the outer lever via a shift and select shaft that is connected to one end of the outer lever. In the transmission in which the shift and select lever is reciprocally moved in the axial direction of the shift and select shaft by rotating the shift lever in the same direction, the shift and select lever is moved by the select operation of the change lever. Is provided with a spring for returning to the neutral position, a cam is provided between the spring and the shift and select lever, and a lever case is provided to surround the shift and select lever,
The lever case is provided with a rib which projects toward the shift and select lever and contacts the cam biased by the spring to position the cam and to position the shift and select lever. Gear shift operation mechanism. 3. An outer lever that connects to the change lever is provided, and the shift and select lever is connected to the outer lever via a shift and select shaft that is connected to one end of the outer lever to shift the shift and select lever to the outer lever. In the transmission in which the shift and select lever is reciprocally moved in the axial direction of the shift and select shaft by rotating the shift and select lever in the same direction, the shift and select lever is moved by the select operation of the change lever. Is provided with a spring for returning to the neutral position, a cam is provided between the spring and the shift and select lever, and a lever case is provided to surround the shift and select lever,
A first positioning portion having ribs projecting toward the shift and select lever side and surrounding the outer peripheral portion of the shift and select lever and having a positioning function of the cam and a neutral positioning function of the shift and select lever is provided in the lever case. A shift operation mechanism for a transmission, characterized in that the rib is formed by a second positioning portion that is located closer to the lever case than the first positioning portion and that projects toward the spring. 4. An outer lever that connects to the change lever is provided, and the shift and select lever is connected to the outer lever via a shift and select shaft that connects the outer lever to one end side. In the transmission in which the shift and select lever is reciprocally moved in the axial direction of the shift and select shaft by rotating the shift lever in the same direction, the shift and select lever is moved by the select operation of the change lever. Is provided with a spring for returning the neutral position to a neutral position, a cam is provided between the spring and the shift and select lever, and a lever case surrounding the shift and select lever is provided.
A rib that projects the shift and select lever side and contacts the cam biased by the spring to position the cam and also positions the shift and select lever is provided in the lever case. A bar member that is parallel to and connects the lever case and the rib is provided, and a mover that slidably suppresses a part of the rotation of the cam is provided and the mover contacts the rib. A shift operation mechanism for a transmission, comprising a deterrent spring for urging.