JPH08233102A - Return spring support structure of speed change operating mechanism - Google Patents

Abstract

PURPOSE: To make a boss for fixing a support plate for 5-speed and reverse smaller, and to make its pitch smaller, so as to improve the rigidity of a speed change gear case, by forming the boss for fixing to fix the support plate for 5-speed and reverse which forms an inserting hole to insert a shaft side error operation preventive body by calking, to the operating mechanism case. CONSTITUTION: The structure to support the 5-speed and reverse return spring 68 of a speed change operating mechanism 106 forms a boss 82 for fixing to fix a support plate 80 for 5-speed and reverse forming an inserting hole 88 to insert a shaft side error operation preventive body 54 by calking, to an operating mechanism case 12, as well as supports a case side support body 78 for 5-speed and reverse. Consequently, the boss 82 for fixing of the support plate 80 for 5-speed and reverse can be made smaller, and the pitch of the boss 82 for fixing can be reduced by making the boss 82 in a smaller size. As a result, the rigidity of the support plate can be secured, and the small size and the light weight of the operating mechanism case 12 can be realized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a return spring support structure for a speed change operation mechanism, and more particularly, it can reduce a fixing boss portion of a fifth speed / reverse support plate fixed to an operation mechanism case of the speed change operation mechanism. In addition, the pitch of the fixing boss portion can be reduced, and the rigidity of the fifth-speed / return support plate that supports the fifth-speed / return return spring can be ensured, and the operating mechanism case can be made smaller and lighter. The present invention relates to a return spring support structure for a speed change operation mechanism, which can achieve cost reduction and increase rigidity of a transmission case.

[0002]

2. Description of the Related Art A vehicle is equipped with a manual or automatic transmission in order to convert the power of an internal combustion engine to a desired value in accordance with running conditions and take it out. Such transmissions include gear type transmissions and belt type transmissions, and gear type transmissions with low power transmission loss are often used.

[0003] A gear type transmission for manually switching the meshing state has a plurality of stages of transmission gear trains, and the meshing state of the gear trains is switched by a shift lever to mesh the gears of the respective stages. The power of the engine is converted as necessary according to the driving conditions and taken out.

In such a gear type transmission, the meshing state is switched by the gear shift operation mechanism. As a gear shift operation mechanism of a transmission, there is one disclosed in Japanese Patent Publication No. 2-14581. A gear shift operation mechanism disclosed in this publication is a housing assembled to a shift and select shaft so as to be rotatable but immovable in an axial direction, and a guide that allows axial movement of the housing and restricts rotation. A lock ball assembled in a hole of the shift and select shaft so as to be retractable, a spring for urging the lock ball toward the housing, and a plurality of lock balls elastically engaged with the housing. It is provided with a detent mechanism composed of a concave portion.

Further, as a gear shift operation mechanism of the transmission, there are those shown in FIGS. 10 to 11, 102 is a transmission, and 104 is a transmission case. In the transmission 102, each shaft (not shown) is provided in a transmission case 104, and a plurality of shift gear trains (not shown) are provided on each shaft. The shift operation mechanism 106 for switching the meshing state of the shift gear train is provided by supporting one end side of the shift and select shaft 108 on a transmission side support portion 110 of the transmission case 104 and the other end side of the shift and select shaft 108. The operating mechanism side support portion 11 of the operating mechanism case 112, which is attached to the transmission case 104 with a fixing bolt (not shown).
4 and supported.

The shift and select shaft 108 is shown in FIG.
As shown in FIG. 5, a shift lever (not shown) is operated to perform a select operation and a shift operation via the control shaft 116 and the control lever 118. As a result, the shift-and-select shaft 108 is selected in the axial direction (direction of arrow A) by a select operation of the shift lever (not shown), and is also moved in the circumferential direction (direction of arrow B) by the shift operation of the shift lever. To be done.

The shift and select shaft 108 is provided with an interlock plate 120 formed in a substantially U shape for preventing malfunction. The interlock plate 120 is
Plate holding bolt 12 attached to the transmission case 104
The movement of the shift-and-select shaft 108 in the axial direction and the circumferential direction is regulated by 2 in a predetermined manner. A shift and select lever 124 is attached to the shift and select shaft 108 in the interlock plate 120.

A lever member 126 is provided on one end side of the shift and select lever 124. Lever member 1
26 is a first speed / second speed shift yoke 128, a third speed / fourth speed shift yoke 130, and a fifth speed / reverse shift yoke 132.
And are selectively engaged with.

The first and second speed shift yokes 128 are
It is provided on the first / second speed shift shaft 134. 3rd speed
The 4th speed shift yoke 130 includes a 3rd speed / 4th speed shift shaft 136.
It is provided in. The 5th speed / reverse shift yoke 1
32 is provided on the fifth speed / reverse shift shaft 138
It is supported by a speed / reverse guide shaft 140.

The first and second speed shift shafts 134 are provided with first and second speed forks 142 for operating a first and second speed sleeve (not shown). 1st / 2nd speed fork 142
Operates the first-speed and second-speed sleeves to bring the first-speed gear train or the second-speed gear train into a meshed state through the first-speed and second-speed synchronizing mechanism. The 3rd and 4th speed shift shafts 136 are not shown in FIG.
3rd / 4th speed fork 14 for operating the 4th / speed sleeves
4 is provided. The 3rd / 4th fork 144 has 3rd /
The fourth speed sleeve is operated to bring the third speed gear train or the fourth speed gear train into a meshed state via the third speed / fourth speed synchronizing mechanism.

The fifth speed / reverse shift shaft 138 has
5-speed fork 14 for operating a 5-speed sleeve (not shown)
6 is provided. The fifth speed fork 146 operates the fifth speed sleeve to bring the fifth speed gear train into an engaged state via the fifth speed synchronization mechanism. A reverse gear shift arm 148 is provided on the fifth speed / reverse guide shaft 140. The reverse gear shift arm 148 swings the reverse gear shift lever 150 to operate a reverse idler gear (not shown) to bring the reverse gear train into a meshed state.

Further, the shift and select lever 1
A stopper member 152 is provided on the other end side of 24.
The stopper member 152 has the tip of the plate holding bolt 122 regulate the select operation and the shift operation in a predetermined manner.

On the other end side of the shift and select shaft 108, a shaft side erroneous operation preventing body 154 for preventing a direct shift operation from the fifth shift position to the reverse shift position is attached. The shaft side erroneous operation preventing body 154 is attached to the shift and select shaft 108 by a locking shaft 156 so as to be movable in the axial direction and slightly movable in the circumferential direction.

An erroneous operation preventing protrusion 158 is formed on the shaft side erroneous operation preventing body 154, and one end side of the erroneous operation preventing spring 160 is engaged with the erroneous operation preventing spring 158. The other end of the erroneous operation preventing spring 160 is supported by an erroneous operation preventing support 162 fixed to the shift and select shaft 108.

The operation mechanism case 112 is provided with a case side erroneous operation preventing body 164 which is engaged with and disengaged from the shaft side erroneous operation preventing body 154. Case side operation prevention body 1
Reference numeral 64 engages with the erroneous operation preventing projection 158 during the 5th speed shift operation of the shift and select shaft 108, and prevents the shift operation of the shift and select shaft 108 from the 5th speed shift position to the reverse shift position directly.

The shift and select shaft 108 has
A third speed / fourth speed return spring 166 and a fifth speed / reverse return spring 168 are provided. 3rd speed
The fourth-speed return spring 166 is provided when the shift-and-select shaft 108 is selected to the third-speed / fourth-speed select position on one end side in the axial direction.
08 is pushed to the neutral position side. The fifth-speed / reverse return spring 168 shifts and selects the shaft 1 when the shift-and-select shaft 108 is selected to the fifth-speed / reverse-select position on the other axial end side.
08 is pushed to the neutral position side.

Return spring 16 for the third and fourth speeds
6 is a case-side support 170 for the third and fourth speeds, one end of which is mounted on the shift and select shaft 108 so as to be axially movable.
Is supported and provided on the other end of the shift and select shaft 10
8 is supported and provided via a shaft side support 172 for the third and fourth speeds. The third-speed / fourth-speed shaft-side support 172 is supported in contact with the interlock plate 120.

The third-speed / fourth-speed case-side support body 170 is restricted from moving toward one end in the axial direction by a third-speed / fourth-speed support plate 174 fixed to the shift-and-select shaft 108. In addition, the case side support 170 for the third and fourth speeds
Is prevented from moving toward the other end in the axial direction by the transmission side support portion 110 of the transmission case 104 during the 3rd speed / 4th speed select operation of the shift and select shaft 108.
The return spring 166 for the fourth speed is compressed to press the shift and select shaft 108 toward the neutral position.

The fifth-speed / reverse return spring 168 has one end on the shift-and-select shaft 108.
A fifth-speed / reverse case-side support body 17 supported and provided through a speed / reverse shaft-side support body 176, and the other end side of which is mounted on the shift-and-select shaft 108 so as to be axially movable.
8 is supported and provided. The fifth-speed / reverse shaft-side support 176 is supported in contact with the interlock plate 120.

5th speed / reverse case side support 178
Is regulated by the fifth-speed / reverse support plate 180 so that the movement toward the other end in the axial direction is predetermined. As shown in FIG. 11, the fifth speed / reverse case side support member 178 is moved toward the one axial end by the fifth speed / reverse support plate 180 during the fifth speed / reverse select operation of the shift and select shaft 108. When blocked, the fifth speed / reverse return spring 168 is compressed to press the shift and select shaft 108 toward the neutral position.

The 5th speed / reverse support plate 180
Is fixed to the fixing boss portion 182 of the operation mechanism case 112 with a fixing bolt 184. As shown in FIGS. 7 to 8, the fifth speed / reverse support plate 180 has a fixing bolt 184 inserted through the fixing hole 186 and screwed into the fixing screw hole 188 of the fixing boss portion 182 to thereby form an operation mechanism case. It is fixed to the fixing boss portion 182 of 112.

Also, a support plate 18 for 5th speed / reverse
7 to 8, the shaft side fixed to the shift and select shaft 108 when the operation mechanism case 112 to which the fifth speed / reverse support plate 180 is fixed is assembled to the transmission case 104. A shaft side erroneous operation preventing body insertion hole 190 for inserting the erroneous operation preventing body 154 is formed.

[0023]

By the way, as shown in FIG.
The shift operation mechanism 106 shown in FIG. 12 is an operation mechanism case 11 to which a fifth speed / reverse support plate 180 is fixed.
2 to the transmission case 104, as shown in FIGS.
As shown in FIG. 5, the shaft-side erroneous operation preventing body insertion hole 190 is formed in the fifth speed / reverse support plate 180. Therefore, the fifth-speed / reverse case side support 178 supporting the fifth-speed / reverse return spring 168 needs to have a large diameter to secure a seat 192 for receiving the compressive force with respect to the fifth-speed / reverse support plate 180. There is.

Further, the support plate 18 for the fifth speed / reverse
No. 0 is fixed by screwing a fixing bolt 184 into a fixing screw hole 188 of the fixing boss portion 182 of the operation mechanism case 112. Therefore, the operation mechanism case 11
2 includes a fixing bolt 18 screwed into a fixing screw hole 188.
In order to prevent the loosening of No. 4, it is necessary to secure a fixing boss portion 182 of a certain size.

As a result, the conventional gear shift operation mechanism 106 is
By increasing the diameter of the case-side support 178 for the fifth speed / reverse and increasing the size of the fixing boss 182, the pitch P of the fixing bolts 184 is increased, and the supporting plate 180 for the fifth speed / reverse is provided. However, there is a problem that the rigidity of is decreased.

Further, in the conventional gear shift operation mechanism 106, the pitch P1 of the fixing bolts 184 is increased, which causes an increase in the size and weight of the operation mechanism case 112, resulting in an increase in cost. As shown in FIG. 9, the shape of the mating surface 194 of the operation mechanism case 112 and the shape of the mating surface 196 of the transmission case 104 become large, and as a result, the mating surface 19 of the transmission case 104 becomes large.
There is a disadvantage that the area of the hole 198 surrounded by 6 becomes large and the rigidity of the transmission case 104 decreases.

[0027]

In order to eliminate such inconvenience, the present invention performs a select operation in the axial direction by a select operation of a shift lever and a shift operation in a circumferential direction by a shift operation of the shift lever. One end side of the shift-and-select shaft is supported by the transmission case, and the other end side of the shift-and-select shaft is supported by the operation mechanism case attached to the transmission case. A case where a shaft side erroneous operation preventing body for preventing a direct shift operation from the fifth speed shift position to the reverse shift position is attached to the other end side, and the operation mechanism case is engaged with and disengaged from the shaft side erroneous operation preventing body. When the shift and select shaft is provided by attaching the side operation preventive body to the other end side in the axial direction of the fifth speed / reverse select operation A 5th speed / reverse return spring for pushing to the neutral position side is provided, and one end side of this 5th speed / reverse return spring is supported by the shift and select shaft via a 5th speed / reverse shaft side support body. At the same time, the other end of the 5-speed / reverse return spring is supported by a 5-speed / reverse case side support which is mounted on the shift and select shaft so as to be axially movable. The operation mechanism case is provided with a fixing boss portion for supporting the support body and for fixing the fifth speed / reverse support plate, which is formed with an insertion hole through which the shaft-side erroneous operation prevention body is inserted, by caulking. Characterize.

[0028]

According to the structure of the present invention, the return spring support structure of the speed change operation mechanism supports the fifth speed / reverse case side support member and the fifth speed member having the insertion hole through which the shaft side misoperation preventing member is inserted.・ Five speed reverse support compared to conventional fixing bosses that are fixed by tightening the fixing bolts by providing the operation mechanism case with the fixing boss that fixes the reverse support plate by caulking. The fixing boss portion of the plate can be made small and the pitch of the fixing boss portion can be made small.

[0029]

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

1 to 6 show an embodiment of the present invention. 4 to 6, 2 is a transmission, and 4 is a transmission case. In the transmission 2, each shaft (not shown) is provided in the transmission case 4, and a plurality of shift gear trains (not shown) are provided on each shaft. The shift operation mechanism 6 for switching the meshing state of the shift gear train is provided by supporting one end side of the shift and select shaft 8 on the transmission side support portion 10 of the transmission case 4 and the other end side of the shift and select shaft 8. Is supported by the operation mechanism side support portion 14 of the operation mechanism case 12 which is attached to the transmission case 4 with a fixing bolt (not shown).

As shown in FIG. 6, the shift and select shaft 8 is selected and shifted through a control shaft 16 and a control lever 18 by operating a shift lever (not shown). As a result, the shift-and-select shaft 8 is selected in the axial direction (direction of arrow A) by the select operation of the shift lever (not shown), and is also moved in the circumferential direction (direction of arrow B) by the shift operation of the shift lever. To be done.

The shift-and-select shaft 8 has a substantially U-shaped interlock plate 20 for preventing malfunction.
Is provided. Movement of the interlock plate 20 in the axial direction and the circumferential direction with respect to the shift and select shaft 8 is regulated by a plate holding bolt 22 attached to the transmission case 4 in a predetermined manner. A shift and select lever 24 is attached to the shift and select shaft 8 in the interlock plate 20.

A lever member 26 is provided at one end of the shift and select lever 24. Lever member 2
The sixth gear 6 is selectively engaged with the first / second gear shift yoke 28, the third / fourth gear shift yoke 30, and the fifth / reverse shift yoke 32.

The first speed / second speed shift yoke 28 is provided on the first speed / second speed shift shaft 34. The third speed / fourth speed shift yoke 30 is provided on the third speed / fourth speed shift shaft 36. The 5th speed / reverse shift yoke 32 has 5
It is provided on a speed / reverse shift shaft 38 and is supported by a fifth speed / reverse guide shaft 40.

The first / second speed shift shaft 34 is provided with a first / second speed fork 42 for operating a first / second speed sleeve (not shown). The first-speed / second-speed fork 42 operates the first-speed / second-speed sleeve to bring the first-speed gear train or the second-speed gear train into a meshed state via the first-speed / second-speed synchronizing mechanism. The third / fourth shift shaft 36 is provided with a third / fourth fork 44 for operating a third / fourth sleeve (not shown). The third-speed / fourth-speed fork 44 operates the third-speed / fourth-speed sleeve to bring the third-speed gear train or the fourth-speed gear train into a meshed state via the third-speed / fourth-speed synchronizing mechanism.

The fifth speed / reverse shift shaft 38 is provided with a fifth speed fork 46 for operating a fifth speed sleeve (not shown). The fifth speed fork 46 operates the fifth speed sleeve to bring the fifth speed gear train into an engaged state via the fifth speed synchronizing mechanism. A reverse gear shift arm 48 is provided on the fifth speed / reverse guide shaft 40. The reverse gear shift arm 48 swings the reverse gear shift lever 50 to operate a reverse idler gear (not shown) to bring the reverse gear train into a meshed state.

Further, the shift and select lever 2
A stopper member 52 is provided on the other end side of 4. The stopper member 52 has the select operation and the shift operation restricted by the tip of the plate holding bolt 22.

On the other end side of the shift and select shaft 8, a shaft side erroneous operation preventing body 54 for preventing a direct shift operation from the fifth shift position to the reverse shift position is attached. The shaft side erroneous operation preventing body 54 is attached to the shift and select shaft 8 by a locking shaft 56 so as to be movable in the axial direction and slightly movable in the circumferential direction.

An erroneous operation preventing projection 58 is formed on the shaft side erroneous operation preventing member 54, and the erroneous operation preventing spring 6 is provided.
It is provided by engaging one end side of 0. The other end of the erroneous operation prevention spring 60 is supported by an erroneous operation prevention support body 62 fixed to the shift and select shaft 8.

The operation mechanism case 12 has a case-side erroneous operation preventing member 64 which is engaged with and disengaged from the shaft-side erroneous operation preventing member 54.
Is installed. The case-side malfunction prevention body 64 is
The shift and select shaft 8 engages with the erroneous operation preventing projection 58 during the 5th speed shift operation, and the shift and select shaft 8 shifts to the 5th position.
The direct shift operation from the fast shift position to the reverse shift position is prevented.

The shift and select shaft 8 is provided with a return spring 66 for the third and fourth speeds and a return spring 68 for the fifth and reverse speeds. The third-speed / fourth-speed return spring 66 presses the shift-and-select shaft 8 toward the neutral position when the shift-and-select shaft 8 is selected to the third-speed / fourth-speed select position on one end side in the axial direction. The fifth-speed / reverse return spring 68 pushes the shift-and-select shaft 8 toward the neutral position when the shift-and-select shaft 8 is selected to the fifth-speed / reverse-select position on the other axial side.

Return spring 66 for the third and fourth speeds
Is provided so as to be supported by a case-side support body 70 for the third and fourth speeds, one end side of which is mounted on the shift and select shaft 8 so as to be movable in the axial direction, and the other end side of the shift and select shaft 8 to the third and fourth speeds.
It is provided so as to be supported via a speed shaft side support body 72. The shaft-side support member 72 for the third speed and the fourth speed is the interlock plate 20.
Is supported in contact with.

The third-speed / fourth-speed case side support member 70 is regulated by the third-speed / fourth-speed support plate 74 fixed to the shift-and-select shaft 8 to a predetermined axial movement. The case-side support 70 for the third and fourth speeds is moved to the other end in the axial direction by the transmission-side support portion 10 of the transmission case 4 when the shift-and-select shaft 8 is in the third-speed and fourth-speed select operation. The movement is blocked, and the return spring 66 for the third and fourth speeds is compressed to press the shift and select shaft 8 toward the neutral position.

The fifth-speed / reverse return spring 68 is provided so that one end thereof is supported by the shift-and-select shaft 8 via a fifth-speed / reverse shaft-side support member 76, and the other end thereof is located at the shift-and-select shaft 8. It is provided so as to be supported by a case-side support body 78 for the fifth speed / reverse which is mounted so as to be axially movable. The fifth speed / reverse shaft-side support member 76 is supported in contact with the interlock plate 20.

The fifth side / reverse case side support 78 is
The fifth speed / reverse support plate 80 regulates the movement toward the other end side in the axial direction. As shown in FIG. 5, the fifth-speed / reverse case side support body 78 supports the fifth-speed / reverse select operation when the shift-and-select shaft 8 is in the fifth-speed / reverse select operation.
The reverse support plate 80 prevents movement toward one end in the axial direction, and the fifth speed / reverse return spring 6
8 is compressed and the shift and select shaft 8 is pressed toward the neutral position.

As shown in FIGS. 1 and 2, the gear shift operation mechanism 6 is provided with the fifth speed / reverse support plate 80 fixed to the fixing boss portion 82 of the operation mechanism case 12 by caulking. . Support plate 80 for 5 speed / reverse
Fits the fixing hole 84 to the fixing protrusion 86 protruding from the fixing boss 82, and the fixing protrusion 86 protrudes from the fixing hole 84.
By caulking the end portion of the operation mechanism case 12, the operation mechanism case 12 is fixed to the fixing boss portion 82.

Also, a support plate 80 for 5th speed / reverse
As shown in FIGS. 1 and 2, the shaft side fixed to the shift and select shaft 8 when the operation mechanism case 12 to which the fifth speed / reverse support plate 80 is fixed is assembled to the transmission case 4. A shaft-side erroneous operation prevention body insertion hole 88 for inserting the erroneous operation prevention body 54 is formed. In addition, in FIG. 1, reference numeral 90 denotes a fifth-speed / reverse case-side support 7
8 is the seat.

As described above, the fifth speed of the speed change operation mechanism 6
The structure that supports the reverse return spring 68 is 5
A fifth speed / reverse support plate 80 supporting the speed / reverse case side support body 78 and formed with a shaft side erroneous operation prevention body insertion hole 88 through which the shaft side erroneous operation prevention body 54 is inserted.
The operation mechanism case 12 is provided with a fixing boss portion 82 for fixing by fixing.

As a result, the speed change operation mechanism 6 is used to fix the fifth speed / reverse support plate 80 as compared with the conventional fixing boss portion 182 which is fixed by tightening the fixing bolt 184 shown in FIGS. The boss portion 82 can be made smaller, and by making the fixing boss portion 82 smaller, the pitch P2 of the fixing boss portion 82 can be made smaller than the pitch P1 of the conventional fixing boss portion 182 shown in FIG. You can

Therefore, in the shift operation mechanism 6, the fixing boss portion 82 of the fifth speed / reverse support plate 80 fixed to the operating mechanism case 12 can be made smaller than before, and the fixing boss portion 82 of the fixing boss portion 82 can be made smaller. Pitch P2 is replaced with conventional pitch P1
Can be smaller than. As a result, the gear shift operation mechanism 6 can secure the rigidity of the fifth-speed / reverse support plate 80 that supports the fifth-speed / reverse return spring 68, and the operation mechanism case 12 can be made smaller and lighter. Therefore, the cost can be reduced.

Further, in the speed change operation mechanism 6, the mating surface 92 of the operation mechanism case 12 can be made small by downsizing the operation mechanism case 12, and the transmission case 4 with which the small mating surface 92 abuts. Mating surface 94
The shape of can be reduced. As a result, the speed change operation mechanism 6 can reduce the area of the hole 96 surrounded by the mating surface 94 of the transmission case 4, and can increase the rigidity of the transmission case 4.

[0052]

As described above, according to the present invention, the return spring support structure of the speed change operation mechanism is provided with the fixing boss portion for fixing the fifth speed / reverse support plate by caulking in the operation mechanism case. As a result, the fixing boss portion of the fifth speed / reverse support plate can be made smaller and the pitch of the fixing boss portion can be made smaller than that of the conventional fixing boss portion which is fixed by tightening the fixing bolt. be able to.

Therefore, in the return spring support structure of the speed change operation mechanism, the fixing boss portion of the fifth speed / reverse support plate fixed to the operation mechanism case of the speed change operation mechanism can be made smaller than before, and By making the pitch of the fixing boss smaller than before, the rigidity of the 5th speed / reverse support plate that supports the 5th speed / reverse return spring can be secured, and the operating mechanism case can be made smaller and lighter. Can be realized, and cost can be reduced.

Further, in this gear shift operating mechanism, the mating surface of the operating mechanism case can be made small by downsizing the operating mechanism case, and the shape of the mating surface of the transmission case with which the mating surface abuts can be made small. As a result, the area of the hole surrounded by the mating surface of the transmission case can be reduced, and the rigidity of the transmission case can be increased.

[Brief description of drawings]

FIG. 1 is a bottom view of a transmission mechanism case showing an embodiment of a return spring support structure for a transmission operating mechanism according to the present invention.

FIG. 2 is a sectional view of a transmission mechanism case.

FIG. 3 is a plan view of a mating surface portion of a transmission case.

FIG. 4 is a cross-sectional view of a gear shift operation mechanism in a neutral position.

FIG. 5 is a cross-sectional view of a speed change operation mechanism during a fifth speed / reverse select operation.

FIG. 6 is a plan view of a shift operation mechanism.

FIG. 7 is a bottom view of a transmission mechanism case showing a conventional example of a return spring support structure of a transmission operation mechanism.

FIG. 8 is a sectional view of a transmission mechanism case.

FIG. 9 is a plan view of a mating surface portion of a transmission case.

FIG. 10 is a cross-sectional view of a shift operation mechanism in a neutral position.

FIG. 11 is a cross-sectional view of a speed change operation mechanism during a fifth speed / reverse select operation.

FIG. 12 is a plan view of a shift operation mechanism.

[Explanation of symbols]

 2 Gearbox 4 Gearbox case 6 Gearshift operation mechanism 8 Shift and select shaft 12 Manipulation mechanism case 20 Interlock plate 24 Shift and select lever 54 Shaft side erroneous operation prevention body 64 Case side erroneous operation prevention body 68 5th speed / reverse return spring 76 5th speed / reverse shaft side support 78 5th speed / reverse case side support 80 5th speed / reverse support plate 82 Fixing boss portion 84 Fixing hole 86 Fixing protrusion 88 Shaft side misoperation prevention body insertion hole 90 Receiving seat 92 mating surface 94 mating surface 96 hole

Claims (1)

[Claims] 1. A shift-and-select shaft, which is axially selected by a shift lever select operation and is circumferentially shifted by a shift lever shift operation, is supported by a transmission case. The other end side of the shift and select shaft is supported by an operation mechanism case attached to the transmission case, and the other end side of the shift and select shaft is directly shifted from the fifth speed shift position to the reverse shift position. A shaft-side erroneous operation preventive body for preventing operation is attached and provided, and a case-side erroneous operation preventive body that is engaged with and disengaged from the shaft-side erroneous operation preventive body is attached and provided in the operation mechanism case, and the shift-and-select shaft is provided in an axial direction or other 5-speed reverse reverse spring that pushes to the neutral position side when the reverse select operation is performed at the 5-speed end Is provided to support one end of the fifth-speed / reverse return spring on the shift and select shaft via a fifth-speed / reverse shaft-side support and the other end of the fifth-speed / reverse return spring. Is provided on the shift-and-select shaft so as to be axially movable so as to be supported by a 5-speed / reverse case-side support, which supports the 5-speed / reverse case-side support and the shaft-side erroneous operation preventing body. A return spring support structure for a speed change operation mechanism, wherein a fixing boss portion for fixing a fifth speed / reverse support plate having an insertion hole formed therein is fixed to the operation mechanism case by caulking.