JPH07301332A - Gear shift device for transmission - Google Patents

Abstract

PURPOSE:To simplify a journalled structure of an inversion lever further with accuracy easily improved, in a gear shift device for a transmission. CONSTITUTION:In a gear shift device for a transmission, the device is constituted by fitting a fitting hole of a boss part 15 further fixed to a prescribed position on a shift rod 14 and by rotatably journaling an inversion lever 9 to a supporting shaft 26 on an upper part of the boss part 15, connected so as to reverse a shift direction by the inversion lever 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear shift device for a gear type transmission used in a vehicle or the like.

[0002]

2. Description of the Related Art FIG. 3 and FIG.
1 shows a gear shift device for a constant mesh type (continuously meshing type) transmission of a gear. In a conventional constant mesh type transmission, there are first to sixth speeds and reverse driven gears that idle on the output shaft,
This always meshes with the drive gear on the counter shaft. A spline-coupled hub is arranged on the output shaft adjacent to the driven gear, and a plurality of coupling sleeves on the spline are slid by a plurality of shift forks so that the selected driven gear and the hub are combined with each other.
Power is transmitted by engaging only the group. 3, a shift rod 51, a third / fourth speed shift rod 52, a first / second speed shift rod 53, a reverse shift rod 54, and a fifth / sixth speed shift rod
Five shift rods 55 are slidably inserted in the through holes of the transmission cover. 3rd / 4th shift rod
52, 1st and 2nd speed shift rods 53, reverse shift rods 54, 5
・ The 6th shift rod 55 has 3rd and 4th forks, respectively.
57, the first and second speed forks 58, the reverse fork 59, and the upper portions of the fifth and sixth speed forks 56 are fitted.

Pin shift holes for the three shift rods, the first and second speed shift rods 53, the reverse shift rod 54, and the fifth and sixth speed shift rods 55, the first and second speed forks 58, the reverse forks 59 and 5,
The pin is inserted into the pin insertion hole of the sixth speed fork 56, and these three forks 58, 59, 56 are fixed at predetermined positions. 3rd / 4th shift rod on top of 3rd / 4th fork 57
The fitting portion with 52 is integrated with the 3rd / 4th shift head 62, and the 3rd / 4th shift rod 52 and the 3rd / 4th shift head 62 are fixed so that they cannot move relative to each other. .
In the conventional gear shift device for a transmission having six forward gears and one reverse gear, in order to make the shift pattern as shown in FIG.
The shift directions for the fifth speed and the sixth speed are reversed. In this shift mechanism, a first slit 66 is formed near one end (left end in FIG. 3) of the shift rod 51, and similarly, a first slit 66 is formed near one end (left end in FIG. 3) of the fifth and sixth speed shift rod 55. 2 slits 67 are formed, shift rod
An inversion lever 68 for moving the 51 and the 5th and 6th speed shift rods 55 in opposite directions is rotatably supported by a case cover of the transmission, and both ends of the inversion lever 68 are provided with a first slit 66 and a second slit 67. Engage with.

The reverse shift rod 54, the first and second speed shift rods 53, and the three shift rods 51 are respectively provided with the reverse shift head 64, the first and second speed shift heads 63, and the fifth shift rod 51.
The 6th speed shift head 61 is fitted. As shown in FIG. 3, in the non-engaging position of the four shift heads 61 to 64, the shift heads are located at the same position in the axial direction, and at this position, the shift rods and the shift heads are fixed. There is. 5.6 speed shift head 61, 3/4 speed shift head
62, the first and second speed shift head 63, the reverse shift head 64 has a shape on the upper surface of which a shift lever (not shown) can be fitted.
6th speed fitting groove 61a, 3rd and 4th speed fitting groove 62a 1, 2nd speed fitting groove 63
a and a backward fitting groove 64a are formed respectively. The same one as the conventional example is described in Japanese Utility Model Laid-Open No. 62-40348.

The operation of the conventional gear shift device of the transmission will be described. Move the shift lever to move the fitting groove 61a.
Select any one of ~ 64a to engage the shift lever. Next, when the shift lever is swung, the fitting groove 61a
The selected mating groove in ~ 64a moves in the axial direction of the selected shift rod, and one of the forks 56-59 connected to the selected shift rod moves. Due to the selected movement of the fork, a sleeve (not shown) fitted to the tip of the fork moves, and the hub on the output shaft and the selected one of the first to sixth speeds and the reverse driven gear are engaged. Are combined.

In the conventional gear shift device of the transmission, the inversion lever 68 is pivotally supported by the case cover of the transmission, but the pivot support structure is complicated and the cost is high.
Further, the interposition of the element called the inversion lever 68 causes a decrease in dimensional accuracy, and therefore, the shift mechanism including the inversion lever 68 is required to have high dimensional accuracy. For example, the inversion lever
If the position of 68 is incorrect for the shift heads 61 to 64,
Stroke shortage or excessive stroke during shift,
It causes trouble. Especially when the entire case cover of the transmission is made of a material with a high coefficient of thermal expansion such as aluminum, it was pivotally supported by the aluminum case cover due to the difference in thermal expansion between the aluminum case cover and the iron-based parts inside the case. The dimensional accuracy between the inversion lever 68 and the shift rods 51 to 54 and the shift heads 61 to 64 was sometimes impaired.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to simplify a shaft supporting structure of an inversion lever in a gear shift device of a transmission and to easily improve accuracy.

[0008]

In a gear shift device of a transmission, a fitting hole of a boss portion is fitted and fixed at a predetermined position on a shift rod, and an inversion lever rotates on a support shaft above the boss portion. The shaft is freely supported and is connected by an inversion lever so that the shift direction is reversed. In a gear shift device of a transmission, a fifth and sixth speed support cylinder, a boss portion,
The fitting holes of the third and fourth speed support cylinders, the auxiliary support cylinder, the first and second speed support cylinders, and the backward support cylinder are inserted, the respective support cylinders are slidable, and the boss portion is fixed to the shift rod.・ The 4th speed support cylinder, the 1st and 2nd speed support cylinders, the reverse support cylinder are connected to the 3rd and 4th speed shifter heads, the 1st and 2nd speed shifter heads, and the reverse shifter head respectively, and the auxiliary support cylinders are the 5th and 6th speed shifter heads and the 1st speed shifter head. The slit is connected, the second slit is connected to the 5th and 6th speed support cylinder, the inversion lever is rotatably supported on the support shaft above the boss, and the first slit and the first slit are provided at both ends of the inversion lever. 2 slits are engaged,
The inversion lever may be connected so that the shift direction is reversed. In the gear shift device of the transmission, 3.4
The respective fitting holes of the first speed support cylinder, the first and second speed support cylinders, and the backward support cylinder are inserted, and the fifth and sixth speed support cylinders and the respective fitting holes of the boss portions are inserted on the second shift rod. Is slidable, the boss is fixed to the second shift rod, the third and fourth speed support cylinders,
The 1st and 2nd speed support cylinders and the backward support cylinder are connected to the 3rd and 4th speed shifter heads, the 1st and 2nd speed shifter heads, and the backward shifter head, respectively, and the inversion lever is rotatably supported on the support shaft above the boss. A 5th and 6th speed shifter head is formed at the other end of the inversion lever, a slit is connected to the 5th and 6th speed support cylinder, a slit is engaged with one end of the inversion lever, and the shift direction is reversed by the inversion lever. Can also be configured to be connected.

[0009]

The inversion lever is rotatably supported on the support shaft above the boss fitted and fixed at the predetermined position on the shift rod. The shift direction is reversed by connecting the shifter head to one end of the inversion lever and connecting the fork to the other end of the inversion lever. 5/6 speed support cylinder, boss, and 1 shift rod
When the fitting holes of the auxiliary support cylinder are inserted, the 5th and 6th speed shifter head and the first slit are connected to the auxiliary support cylinder, and the second slit is connected to the 5th and 6th speed support cylinder. The first slit and the second slit are engaged with both ends of the inversion lever, and the shift direction is reversed by the inversion lever. Fitting holes for the third and fourth speed support cylinders, the first and second speed support cylinders, and the backward support cylinder are inserted through the first shift rod, and the fifth and sixth speed support cylinders and the boss portions are fitted over the second shift rod. When the dowel is inserted, the slit is connected to the 5th and 6th speed supporting cylinder, the slit is engaged with one end of the inversion lever, and the 5th and 6th speed shifter head is formed at the other end of the inversion lever. . The shift direction from the other end of the inversion lever is reversed by the inversion lever and transmitted to one end of the inversion lever.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a gear shift device for a transmission according to the present invention will be described with reference to FIG. Insertion holes 12 and 13 are formed in the vertical walls 10 and 11 on both sides of the transmission case cover, and both ends of one shift rod 14 are inserted into the insertion holes 12 and 13, respectively. Fixed. The shift rod 14 has one end side (the left end side in FIG. 1a) in order,
The respective fitting holes of the 5th and 6th speed support cylinder 4a, the boss portion 15, the 3rd and 4th speed support cylinder 3a, the auxiliary support cylinder 5, the 1st and 2nd speed support cylinder 2a, and the backward support cylinder 1a are inserted, and the respective support cylinders 1a. ~ 4a is slidable. Figure 1b
As shown in FIG. 3, a screw hole 16 is formed at the lower end of the boss portion 15, a screw pin 17 is screwed into the screw hole 16, and the tip of the screw pin 17 is fitted into a cutout portion 19 formed at a predetermined position of the shift rod 14. By pressing, the boss portion 15 is fixed at the position shown in FIG. 1a, and the nut 18 is screwed onto the screw pin 17 to prevent the screw pin 17 from loosening. 5.
6th speed support cylinder 4a, 3rd / 4th speed support cylinder 3a, 1st / 2nd speed support cylinder 2a,
The reverse support cylinder 1a is integrally fixed to the upper ends of the fifth and sixth speed forks 4, the third and fourth speed forks 3, the first and second speed forks 2, and the reverse fork 1, respectively. An auxiliary connecting arm 5b is integrally fixed to the outside of the upper part of the auxiliary supporting portion 5 (upper side in FIG. 1a), and is not shown so that the auxiliary connecting arm 5b is maintained in the upper position as shown in FIG. 1a. The shift rod 14 is supported by using a key or the like. As shown in FIG. 1a, a spring chamber 20 penetrating in the horizontal direction is formed in the retreat support cylinder 1a, a ball 21 is arranged inside the spring chamber 20, and the tip of the spring presses the ball 21. The rear end is supported by a spring retainer 22. Three grooves are formed at predetermined positions on the surface of the shift rod 14, the center groove corresponds to the neutral position, and the grooves on both sides correspond to the shift position,
When the ball 21 is engaged in the central groove as shown, the retracting fork 1 is in the neutral position, and when the ball 21 is engaged in the grooves on both sides, the retracting fork 1 is in the shift position. (In the case of the reverse fork 1, there is only one shift position), and it is maintained at each position by the pressure of the spring.
5th / 6th speed support cylinder 4a, 3rd / 4th speed support cylinder 3a, 1st / 2nd speed support cylinder
For each of the support cylinders 2a, the same maintenance mechanism as in the case of the backward support cylinder 1a is formed.

3rd and 4th speed support cylinders 3a, which are located slightly above the outside
・ 3rd and 4th speed fitting groove 3c is formed on the 4th speed shifter head.
・ The upper part of the 2nd speed support cylinder 2a is extended in parallel with the shift rod 14 to form the 1st and 2nd speed connecting arm (extension part) 2b, and the 1st and 2nd speed shifter head on the tip of the 1st and 2nd speed connecting arm 2b・
A second speed fitting groove 2c is formed, and the third and fourth speed fitting groove 3c and the first and second speed fitting groove 2c are located adjacent to each other. The auxiliary connecting arm 5b integrally fixed to the auxiliary supporting portion 5 is attached to the shift rod 14
Extends in parallel with to form the auxiliary connecting arm 5b, and the auxiliary shifter head in the middle upper part of the auxiliary connecting arm 5b has a 5th and 6th speed fitting groove.
5c is formed, and the first slit 23 is formed at the tip of the auxiliary connecting arm 5b. 5th and 6th speed fitting groove 5c is a 3rd and 4th speed fitting groove
It is located adjacent to the outside of 3c, and the tip of the auxiliary connecting arm 5b is located slightly outside the 5th and 6th speed fitting groove 5c. The upper outer side (the lower side in FIG. 1a) of the retreat support cylinder 1a is extended in parallel with the shift rod 14 to form a retreat connection arm 1b, and a retreat fitting groove 1c is formed in the retreat shifter head at the upper end of the retreat connection arm 1b. The backward fitting groove 1c and the 1st / 2nd speed fitting groove 2c are located adjacent to each other, and the 5th / 6th speed fitting groove 5c, 3 ・
The fourth speed fitting groove 3c, the first and second speed fitting groove 2c, and the backward fitting groove 1c are sequentially arranged in parallel. If necessary, the support cylinders 1a, 2a, 3a and the shift rod 14 are configured not to rotate relative to each other so that the fitting grooves 5c to 1c are parallel. 5/6 speed support cylinder
The upper outer side (lower side in FIG. 1a) of 4a is extended in parallel with the shift rod 14 to form the 5th and 6th speed connecting arm 4b (the extension directions of the 5th and 6th speed connecting arm 4b are the auxiliary connecting arms 5b, 1 The second slit 24 is provided at the tip of the 5th and 6th speed connecting arm 4b.
Is formed. Support shaft from the center of the top of the boss 15 upwards
26 integrally extends, the support hole in the central portion of the inversion lever 9 is rotatably fitted to the support shaft 26, and a split pin is inserted in the annular groove at the upper end of the support shaft 26 as shown in FIG. 1b. It is fitted to prevent the inversion lever 9 from coming off. One end (upper end in FIG. 1a) of the inversion lever 9 is engaged with the first slit 23, and the other end (lower end in FIG. 1a) of the inversion lever 9 is engaged with the second slit 24. Here, an example of a transmission having six forward gears and one reverse gear is shown, but the present invention can also be applied to a gear shift device having another gear number.

The operation of the first embodiment of the present invention when gear shifting the transmission will be described. The tip of the shift lever (not shown) has the 5th and 6th speed fitting grooves 5c, the 3rd and 4th speed fitting grooves 3c, 1
-Select and fit any one of the second speed fitting groove 2c and the backward fitting groove 1c. When shifting to the first speed or the second speed, the tip of the shift lever is fitted in the first and second speed fitting groove 2c to move the first and second speed connecting arm 2b leftward or rightward. The 1st and 2nd speed support cylinder 2a moves leftward or rightward on the shift rod 14, and the 1st and 2nd speed fork 2 integrated with the 1st and 2nd speed support cylinder 2a moves leftward or rightward, A sleeve (not shown) fitted to the tip of the second speed fork 2 moves to engage the hub splined to the output shaft and the driven gear of the first speed or the second speed. When shifting to the 3rd or 4th speed, the tip of the shift lever is fitted into the 3rd or 4th speed fitting groove 3c, and the 3rd or 4th speed support cylinder 3a
On the shift rod 14 to the left or to the right.
The 3rd and 4th speed fork 3 integrated with the 3rd and 4th speed support cylinder 3a moves leftward or rightward, and the sleeve (not shown) fitted to the tip of the 3rd and 4th speed fork 3 moves to output the output shaft. The hub, which is spline-coupled to, and the driven gear of the third speed or the fourth speed are engaged.

When shifting to fifth speed or sixth speed,
Fit the tip of the shift lever into the 5th and 6th speed fitting groove 5c, and
・ Move the 6th-speed auxiliary connecting arm 5b leftward or rightward. The auxiliary support portion 5 moves leftward or rightward on the shift rod 14, and the first slit 23 at the tip of the fifth and sixth speed auxiliary connecting arm 5b also moves leftward or rightward. 1st slit
Since 23 and one end of the inversion lever 9 are engaged, the inversion lever 9 swings counterclockwise or clockwise around the support shaft 26 and engages with the other end of the inversion lever 9. The second slit 24 of the 5th and 6th speed connecting arm 4b moves rightward or leftward. The 5th and 6th speed fork 4, which is integrated with the 5th and 6th speed connecting arm 4b and the 5th and 6th speed support cylinder 4a, moves to the right or left, and is fitted to the tip of the 5th and 6th speed fork 4 (not shown). The sleeve moves to engage the hub splined to the output shaft with the driven gear of the fifth speed or the sixth speed. When shifting to the reverse speed, the tip of the shift lever is fitted into the reverse fitting groove 1c, and the reverse connecting arm 1b is moved to the right. The reverse support cylinder 1a moves rightward on the shift rod 14, the reverse fork 1 integrated with the reverse support cylinder 1a moves right, and the sleeve (not shown) fitted to the tip of the reverse fork 1 moves. As a result, the hub splined to the output shaft and the reverse driven gear are engaged. Since the inversion lever 9 is pivotally supported by the support shaft 26, it is not affected by thermal expansion due to the temperature rise of the case cover.

A second embodiment of the gear shift device for a transmission according to the present invention will be described with reference to FIG. Through holes 27 to 30 are formed in the vertical walls 10 and 11 on both sides of the transmission case cover, both ends of the first shift rod 31 are inserted into the through holes 27 and 28, and the second shift is inserted into the through holes 29 and 30. Both ends of the rod 32 are inserted and fixed in the same manner as the case of the boss portion 35 described later. The first shift rod 31 has one end side (the left end side in FIG. 2) in order from the 3rd / 4th speed support cylinder 3a, the 1st / 2nd speed support cylinder 2a,
The fitting holes of the backward support cylinder 1a are inserted, and the respective support cylinders 1a to 3a are slidable. In the second shift rod 32, the fifth and sixth speed support cylinders 4a, the fitting holes of the boss portion 35, and the cylindrical portion are arranged in this order from one end side.
The fitting holes at the tips of 3c to 1c are inserted, and the support cylinder 4a is slidable. The 3rd and 4th speed tubular portion 3c, the 1st and 2nd speed tubular portion 2c, and the retreat tubular portion 1c are respectively integrated with the 3rd and 4th speed support barrel 3a, the 1st and 2nd speed support barrel 2a, and the backward support barrel 1a. 3rd / 4th speed support cylinder 3
The first and second speed support cylinders 2a and the reverse support cylinder 1a respectively project horizontally toward the second shift rod 32. Boss part 35
Is fixed to the second shift rod 32 by the same method as the boss portion 15 of the first embodiment. As in the case of the first embodiment, the fifth and sixth speed support cylinders 4a, the third and fourth speed support cylinders 3a, the first and second speed support cylinders 2a, and the backward support cylinder 1a are the fifth and sixth speed forks 4, 3.4.
The speed fork 3, the first / second speed fork 2, and the reverse fork 1 are integrally fixed to the respective upper ends. Backward tubular part 1c
Is formed with a spring chamber 40 extending in the horizontal direction, a ball 41 is arranged at the tip of the spring chamber 40, the tip of the spring presses the ball 41, and the rear end of the spring is supported by the rear end of the spring chamber 40. There is. Second shift rod
Three grooves are formed at predetermined positions on the surface of 32, the central groove corresponds to the neutral position, the grooves on both sides correspond to the shift position, and the balls 41 engage with the central groove as shown. The reverse fork 1 is in the neutral position, and the reverse fork 1 is in the shift position when the balls 41 are engaged in the grooves on both sides (in the case of the reverse fork 1, there is only one shift position). , Maintained in each position by spring pressure. For each of the support cylinders of the third and fourth speed support cylinders 3a and the first and second speed support cylinders 2a, the same maintenance mechanism as that of the backward support cylinder 1a is formed. In the fifth and sixth speed support cylinders 4a, the second shift rod 32 has a maintenance mechanism formed in the same manner as in the first embodiment.

The upper part of the third and fourth speed supporting cylinders 3a, which is slightly outside, is parallel to the first shift rod 31 in one end direction (left end direction in FIG. 2).
To the third and fourth speed connecting arms 3b, and a third and fourth speed fitting groove 3c is formed in the third and fourth speed shifter head above the tip of the third and fourth speed connecting arm 3b. Place the upper part of the 1st and 2nd speed support cylinder 2a first
1st and 2nd speed connecting arm 2b extending parallel to shift rod 31
None, the 1st and 2nd speed fitting groove 2c is formed in the 1st and 2nd speed shifter head above the tip of the 1st and 2nd speed connecting arm 2b, and the 3rd and 4th speed fitting groove 3c and the 1st and 2nd speed fitting groove 2c Are located adjacent to each other.
A support shaft 36 integrally extends upward from the center of the upper portion of the boss portion 35, and a support hole in the center portion of the inversion lever 8 is rotatably fitted to the support shaft 36. One end (the upper end in FIG. 2) of the inversion lever 8 is engaged with a slit 38 described later, and the other end (the lower end in FIG. 2) of the inversion lever 8 is engaged.
Is not a wide 5/6 speed shifter head, and the 5/6 speed shifter head is provided with a 5/6 speed fitting groove 8c.
8c is located adjacent to the outside of the 3rd and 4th speed fitting groove 3c.
The upper outer side (lower side in FIG. 2) of the retreat support cylinder 1a is extended in parallel with the first shift rod 31 to form a retreat connection arm 1b, and the retreat shift groove at the top of the retreat connection arm 1b is provided with a retreat fitting groove 1c. The rearward fitting groove 1c and the first and second speed fitting groove 2c are located adjacent to each other, and the fifth and sixth speed fitting grooves 8c, 3 ...
The fourth speed fitting groove 3c, the first and second speed fitting groove 2c, and the backward fitting groove 1c are sequentially arranged in parallel. A 5th and 6th speed connecting arm is formed by extending the upper outer side (upper side in FIG. 2) of the 5th and 6th speed supporting cylinder 4a in parallel with the second shift rod 32 toward the other end (right end direction in FIG. 2).
4b and none (extension direction of 5th and 6th speed connecting arm 4b is 3.4
(5th and 6th speed connecting arms 3b, 1st and 2nd speed connecting arms 2b, reverse connecting arm 1b) and 5th and 6th speed connecting arms 4b
A slit 38 is formed at the tip of the. Here, forward 6
An example of a transmission having one gear and one reverse gear has been shown, but the invention can be applied to a gear shift device having other gears.

The operation of the second embodiment of the present invention when gear shifting the transmission will be described. The tip of a shift lever (not shown) has a 5th and 6th speed fitting groove 8c, a 3rd and 4th speed fitting groove 3c, 1
-Select and fit any one of the second speed fitting groove 2c and the backward fitting groove 1c. When shifting to the first speed or the second speed, the tip of the shift lever is fitted in the first and second speed fitting groove 2c to move the first and second speed connecting arm 2b leftward or rightward. The 1st / 2nd speed support cylinder 2a moves leftward or rightward on the first shift rod 31, and is integrated with the 1st / 2nd speed support cylinder 2a
The 2nd speed fork 2 moves leftward or rightward, and a sleeve (not shown) fitted to the tip of the 1st / 2nd speed fork 2 moves and the hub splined to the output shaft and the 1st speed or 1st speed. The driven gear of the second speed is engaged.
When shifting to the third speed or the fourth speed, the tip of the shift lever is fitted in the third and fourth speed fitting groove 3c and the third and fourth speed connecting arm 3b is moved leftward or rightward. The third / fourth speed support cylinder 3a moves leftward or rightward on the first shift rod 31, the third / fourth speed fork 3 integrated with the third / fourth speed support cylinder 3a moves leftward or rightward, A sleeve (not shown) fitted to the tip of the third / fourth speed fork 3 moves to move to a hub splined to the output shaft and the third speed or the fourth speed.
The fast driven gear is engaged.

When shifting to the fifth speed or the sixth speed,
The tip of the shift lever is fitted in the 5th and 6th speed fitting groove 8c, and the inversion lever 8 is swung leftward or rightward. The inversion lever 8 swings clockwise or counterclockwise around the support shaft 36, and the slit 38 of the fifth and sixth speed connecting arm 4b engaged with one end of the inversion lever 8 is directed to the right or left. Move to. The 5th and 6th speed fork 4, which is integrated with the 5th and 6th speed connecting arm 4b and the 5th and 6th speed support cylinder 4a, moves to the right or left, and is fitted to the tip of the 5th and 6th speed fork 4 (not shown). The sleeve moves to engage the hub splined to the output shaft with the driven gear of the fifth speed or the sixth speed. When shifting to the reverse speed, the tip of the shift lever is fitted into the reverse fitting groove 1c, and the reverse connecting arm 1b is moved to the right. The reverse support cylinder 1a moves rightward on the first shift rod 31, the reverse fork 1 integral with the reverse support cylinder 1a moves rightward, and a sleeve (not shown) fitted to the tip of the reverse fork 1 moves. After the movement, the hub splined to the output shaft and the reverse driven gear are engaged. Since the inversion lever 8 is pivotally supported by the support shaft 36, it is not affected by thermal expansion due to temperature rise of the case cover. In addition, in the second embodiment, the inversion lever 8 is 5/6.
Since it also serves as the 5th and 6th speed shifter head of the fast connecting arm, the number of parts can be reduced (tolerance and play are reduced, and weight can be reduced) compared to the first embodiment.

[0018]

According to the present invention, in the gear shift device of the transmission, the fitting hole of the boss portion is fitted and fixed at a predetermined position on the shift rod, and the inversion lever rotates on the support shaft above the boss portion. Freely supported. Therefore,
Compared to the conventional example, the shaft supporting structure of the inversion lever is simplified, and the play can be reduced. Also,
Since the boss is fixed on the shift rod, the shift mechanism including the inversion lever is not affected by the deformation due to the thermal expansion of the aluminum case cover, and the heat from the aluminum case cover is transferred to the shift mechanism. Therefore, the dimensional accuracy of the shift mechanism including the inversion lever can be easily increased, and an appropriate shift amount can be maintained. When the first slit is engaged with one end of the inversion lever and the second slit is engaged with the other end, heat is not transferred to the inversion lever as compared with the conventional example (the same inversion lever and slit are used). Because of the temperature), a high dimensional accuracy is maintained between the slit and the slit at the end of the inversion lever. Further, in the conventional gear shift device for a transmission, five shift rods are used, whereas in the present invention, one or two shift rods are used.
It can be made into a book, the number of parts can be reduced, and the weight can be reduced.

[Brief description of drawings]

1a is a top view of a first embodiment of a gear shift device for a transmission according to the present invention, and FIG. 1b is a sectional view taken along the line AA of FIG. 1a.

FIG. 2 is a top view of a second embodiment of the gear shift device for a transmission according to the present invention.

FIG. 3 is a top view of a gear shift device of a conventional transmission.

FIG. 4 is a diagram showing a shift pattern.

[Explanation of symbols]

 8 Inversion lever 9 Inversion lever 14 Shift rod 15 Boss portion 26 Support shaft 31 First shift rod 32 Second shift rod 35 Boss portion 36 Support shaft

Claims (3)

[Claims] 1. A fitting hole of a boss portion is fitted and fixed at a predetermined position on a shift rod, an inversion lever is rotatably supported by a support shaft above the boss portion, and the inversion lever shifts the shift lever. A gear shift device for a transmission that is connected so that the directions thereof are reversed. 2. Fitting holes for a fifth and sixth speed support cylinder, a boss portion, a third and fourth speed support cylinder, an auxiliary support cylinder, a first and second speed support cylinder, and a backward support cylinder are inserted through one shift rod. Each support cylinder is slidable, and the boss is fixed to the shift rod.
The 4th speed support cylinder, the 1st and 2nd speed support cylinders, the reverse support cylinder are connected to the 3rd and 4th speed shifter heads, the 1st and 2nd speed shifter heads, and the reverse shifter head respectively, and the auxiliary support cylinders are the 5th and 6th speed shifter heads and the first slit. The second slit is connected to the fifth and sixth speed support cylinders, the inversion lever is rotatably supported by the support shaft above the boss, and the first slit and the second slit are provided at both ends of the inversion lever. A gear shift device for a transmission, in which a slit is engaged, and the shift lever is connected so that the shift direction is reversed by an inversion lever. 3. A third / fourth speed support cylinder on the first shift rod,
The fitting holes of the 1st and 2nd speed support cylinders and the backward support cylinder are inserted, the 5th and 6th speed support cylinders and the fitting holes of the boss are inserted on the second shift rod, and each support cylinder is slidable And the boss is the second
Fixed to the shift rod, 3rd and 4th speed support cylinders, 1st and 2nd speed support cylinders, and 3rd and 4th speed shifter heads, 1st and 2nd speed shifter heads, and backward shifter heads are connected to the backward support cylinder,
An inversion lever is rotatably supported on a support shaft above the boss portion, a 5th and 6th speed shifter head is formed at the other end of the inversion lever, and a slit is connected to the 5th and 6th speed support cylinder. A gear shift device for a transmission, in which a slit is engaged with one end of a lever and the shift lever is connected so that the shift direction is reversed by the inversion lever.