JPS6129067Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shift mechanism for a vehicle transmission.

Generally, in a 5-speed transmission with a shift pattern in which a 5-speed shift and a reverse shift are arranged opposite each other, the reverse gear is arranged between 1st and 2nd speeds, and power is sent to the reverse gear via a reverse idle gear. If the reverse idle gear is unnecessarily moved in the opposite direction to the reverse shift direction when shifting to 5th gear, there will be a space between 1st and 2nd gears that allows the reverse idle gear to move. Therefore, the length of the transmission in the shaft direction increases.

Therefore, various shift mechanisms have been proposed in the past that do not increase the length in the shaft direction of a transmission in which a 5-speed shift and a reverse shift are disposed facing each other. That is, in the shift mechanism shown in Japanese Patent Publication No. 50-1057, the 5-speed forkshaft and the reverse forkshaft are separated, and the forward and backward movement of the shift head common to them is
Both forkshafts are separated and shifted only in opposite directions, so that unnecessary movement ranges are not set for each forkshaft. However, in such a shift mechanism, 5
Since the speed forkshaft and reverse forkshaft are separated, there is a problem in that the number of forkshafts and their locking mechanisms increases.

In addition, as another conventional shift mechanism, a single fork shaft serves as both a 5-speed fork shaft and a reverse fork shaft, and either one of the shift forks can be slid onto the fork shaft, and the shaft direction length of the transmission is Efforts are being made to suppress the increase in However, in such a shaft mechanism, when the fork slides, the support length of the shift fork to the fork shaft is short, so the shift force acting between the gear and the shift fork causes the shift fork to tilt significantly, resulting in shift feeling. The problem is that it is bad.

Furthermore, as another conventional example, Japanese Patent Application Laid-Open No. 51-87658
In the shift mechanism shown in the publication, the 5-speed forkshaft and the reverse forkshaft are shared by a single forkshaft, and a swing lever for shifting the reverse idle gear is provided. The L-shaped slot is engaged with a pin provided on the 5-speed shift fork shaft, and when shifting to 5th gear, the inverted L-shaped slot allows the movement of the pin to keep the rocking lever stationary, and when shifting to reverse gear, the pin is The operating force is transmitted to the swing lever through the inverted L-shaped slot, and the power can be transmitted through the reverse idle gear. In such a shift mechanism, both the 5th speed shift fork and the reverse shaft fork are integrally fixed or locked on the fork shaft and slide. However, the reverse shift fork is activated when shifting to 5th speed. There is a problem in that the mechanism that prevents this from happening is complicated.

This idea was created in view of the above-mentioned conventional problems.The 5-speed forkshaft and the reverse forkshaft are shared by a single forkshaft, and the 5-speed shift fork and the reverse shift fork are combined into a forkshaft. To provide a shift mechanism for a vehicle transmission which has a shaft slide that is integrally fixed or locked to slide a forkshaft and has a simple structure.

In order to achieve the above object, this invention provides a shift mechanism for a vehicle transmission in which a 5-speed shift and a reverse shift are arranged facing each other, including a 5-speed and reverse forkshaft slidably supported by a case; The 5-speed and reverse shift head is fixed to the 5-speed and reverse forkshaft, the 5-speed shift fork is fixed to the 5-speed and reverse forkshaft, and it can be slid to the 5-speed and reverse forkshaft and the 3-speed and 4-speed forkshaft. The reverse shift fork is installed in the reverse shift fork, and is disengaged from the 5th speed and reverse shift head when shifting to 5th gear, and is engaged with the 5th speed and reverse shift head when shifting to reverse. Sometimes the reverse shift fork is integrated into the 3rd and 4th speed fork shaft, and when reverse shifting, the reverse shift fork is integrated into the 5th and 4th speed fork shafts.
A shift mechanism for a vehicle transmission, comprising a connecting roller integrated with a speed and reverse fork shaft, wherein the reverse shift fork extends in the longitudinal direction of the fifth speed and reverse fork shaft, and the reverse shift fork extends in the longitudinal direction of the fifth speed and reverse fork shaft. It straddles the reverse shift head and is assembled to the 5-speed and reverse fork shaft at both ends in the extension direction, with the reverse shift side assembly part of the reverse shift fork serving as the engagement part with the 5-speed and reverse shift head. be.

Hereinafter, embodiments of this invention will be described with reference to the drawings.

FIGS. 1 and 2 are explanatory diagrams showing one embodiment of a shift mechanism of a vehicle transmission according to this invention. Above the transmission gear group in the case 10 are three 1st and 2nd speed fork shafts 1.
A 1st, 3rd and 4th speed forkshaft 12 and a 5th speed and reverse forkshaft 13 are arranged in parallel with each other so as to be movable in the axial direction.

The 3rd and 4th speed forkshaft 12 has a small diameter interlock pin 1 inside the case 10.
A third and fourth gear shift head 16 is fixed by a pin 16A and is disposed directly above the transmission gear train and selectively engages a shift lever 15 that performs a shift operation based on a shift pattern. A third and fourth speed shift fork 17 that engages a clutch device for speed and fourth speed shifting is fixed by a pin 17A. That is, shift lever 1
5, 3rd and 4th speed shift head 16, 3
When the 1st and 4th shift fork shafts 12 and 3rd and 4th shift forks 17 are moved back and forth, the third shift
4th speed and 4th speed.

Next, 1st and 2nd speed forkshaft 11
is the large diameter interlock pin 1 inside the case 10.
8 interlocks with the 3rd and 4th speed forkshaft 12 and is disposed on the right side thereof, and
A 1st and 2nd speed shift fork 1 that is aligned with the 1st and 4th speed shift head 16 and selectively engages with the shift lever 15 and also serves as a shift head and engages with the clutch device for 1st and 2nd speed shifting.
9 is fixed by a pin 19A. That is, when the 1st and 2nd speed shift fork 19 and the 1st and 2nd speed fork shaft 11 are moved back and forth by the shift lever 15, the first and second speeds are changed through selective engagement of the clutch device. Gear shifting is now taking place.

Furthermore, the 5th speed and reverse forkshaft 13 is interlocked with the 3rd and 4th speed forkshaft 12 by a trapezoidal interlock pin 20 within the case 10, and is disposed on the left side thereof.
A 5th speed and reverse shift head 21 which is aligned with the 3rd speed and 4th speed shift head 16 and selectively engages with the shift lever 15 is fixed by a pin 21A. At the tip of the 5-speed and reverse fork shaft 13, a 5-speed shift fork 22 that engages with a clutch device for shifting to the 5th speed is attached to a pin 2.
It is fixed by 2A. Further, a connecting portion 24 of a reverse shift fork 23 is attached to the 5-speed and reverse fork shaft 13 and the 3-speed and 4-speed fork shaft 12 so as to be slidable in the axial direction. In addition, on the opposite side of the reverse shift fork 23 from the connecting portion 24 to the 5th speed and reverse shift head 21, there is an engaging portion 25 with which the end surface of the 5th speed and reverse shift head 21 that shifts from the neutral position to the 5th speed comes into contact. It is extended to be attached to the speed and reverse forkshaft 13. In addition, in the connection part 24 of the reverse shift fork 23, the reverse shift fork 23 is integrated with the 3rd and 4th speed fork shaft 12 during a 5th speed shift, and the reverse shift fork 23 is integrated with the 5th speed and reverse fork shaft 13 during a reverse shift. A connecting roller 26 to be integrated is built-in. The tip of the reverse shift fork 23 extends downward, and the reverse shift arm 2 is rotatably supported via a shaft 28 by a bracket 27 fixed to the case 10.
An engaging member 31 is provided at the tip of the reverse shift arm 29 and connected to the pin 30 at the intermediate portion of the reverse shift arm 29 . Engagement member 3 of reverse shift arm 29
1 is engaged with an annular groove 34 of a reverse idle gear 33 supported by a reverse idle gear shaft 32, as shown in FIG. In other words, when shifting to 5th gear, shift lever 1
5 to 5-speed and reverse shift head 21;
5 speed and reverse forkshaft 13 and 5
When the speed shift fork 22 is moved to the left in FIG. 1, a fifth speed shift is effected through selective frictional engagement of the clutch device. Therefore, the reverse shift fork 23 is connected to the case 1 by the interlock pin 20 via the connecting roller 26.
Since it is integrated with the 3rd and 4th speed forkshaft 12 which is fixed at 0, it does not move at all. On the other hand, during reverse shifting, when the shift lever 15 moves the 5th speed and reverse shift head 21 and the 5th speed and reverse forkshaft 13 to the right in FIG. 25, the reverse shift fork 23 moves together, and the reverse shift arm 2
9 to move the reverse idle gear 33 to the left in FIG. By combining the two, it is possible to obtain reverse speed. Here, 3 speed and 4 speed forkshaft 1
2 is fixed to the case 10 by an interlock pin 20, the connecting roller 26 engages with the 5th speed and reverse forkshaft 13 side, and even when returning to the neutral position after a reverse shift, the 5th speed and reverse The shift head 21, the 5-speed and reverse forkshaft 13, and the reverse forkshaft 23 are integrated and can be moved to a neutral position at the same time. In addition, the third
In the figure, 37 indicates the first speed drive gear, and 38
39 indicates a 2nd speed drive gear, and 39 indicates a 3rd speed drive gear.

Next, the operations of the 5th speed shift and reverse shift in the shift mechanism of the above embodiment will be explained.

When the 5th gear is shifted from the neutral position shown in FIG. Head 21, 5-speed and reverse fork shaft 13, and 5-speed shift fork 22
moves in the shift direction, and the fifth gear shift state is switched through selective engagement of the clutch device.
The reverse shift fork 23 during the shift operation is connected to the 3rd and 4th speed fork shaft 12 which is fixed to the case 10 by the interlock pin 20 via the connecting roller 26. Its stationary state is maintained, so the reverse idle gear 33 does not move.

When reverse shifting from the neutral position,
With the 5th speed and reverse shift head 21 and the engaging portion 25 of the reverse shift fork 23 integrated in the reverse shift direction, the 5th speed and reverse fork shaft 13 moves, and by the swing of the reverse shift arm 29, the reverse shift is performed. The idle gear 33 is a reverse drive gear 36 of the intermediate shaft 35
and the reverse driven gear on the output shaft side, and the reverse driving force is transmitted to the output shaft. When returning from the reverse shift position to the neutral position, since the reverse shift fork 23 is integrated with the 5th speed and reverse fork shaft 13 via the connecting roller 26, the 5th speed and reverse shift head 21 and the 5th speed And reverse fork shaft 13 and reverse shift fork 23
The reverse idle gear 33 is moved back to the neutral position via the reverse shift arm 29.

According to the above embodiment, the single 5-speed and reverse fork shaft 13 has a 5-speed shift fork 2.
2 and a reverse shift fork 23, and a 5th speed and reverse shift head 21 when shifting to 5th speed.
Since the shift operation has no effect on the reverse shift fork 23, no space is required for the movement of the reverse idle gear 33 when shifting to 5th speed, and the length of the transmission in the shaft direction can be shortened. . Furthermore, the 5-speed shift fork 22 and the reverse shift fork 23 are integrally fixed or locked to the 5-speed and reverse fork shaft 13 during shifting,
Since it moves together with the 5-speed and reverse forkshaft 13 supported at both ends by the case 10, it does not tilt significantly due to the shift force applied during shifting, ensuring a good shift feeling. Furthermore, during non-reverse shifting, the reverse shift fork 23 is integrated with the 3rd and 4th speed fork shaft 12, which is fixed to the case 10 by an interlock pin 20, via a simple connecting roller 26. Therefore, its free movement can be prevented by a simple structure.

As described above, according to the shift mechanism of the vehicle transmission according to the present invention, a single fork shaft is used for the 5th speed shift and the reverse shift, and each shift fork is used as a fork shaft during shifting. This has the effect that the shaft can be slid along with the forkshaft while being integrated with the shaft, and the structure thereof can be simplified. Also, according to the present invention,
The reverse shift fork extends in the longitudinal direction of the shaft and is assembled to the shaft at both ends in the direction of extension, so it is less affected by the shift force that acts between the gear and the shift fork, resulting in a good shift feeling. . Furthermore, according to the present invention, the assembly part on the reverse shift side of the reverse shift fork to the 5th speed and reverse shaft is the engaging part with the 5th speed and reverse shift head, so that the 5th speed and reverse shaft can be connected to the 5th speed and reverse shaft during reverse shifting. and the reverse shift fork are integrated by a connecting roller, and the reverse shift fork engages with the 5th speed and reverse shift head and is urged toward the reverse shift side,
Reverse shifting can be performed reliably.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a main part showing an embodiment of a shift mechanism of a vehicle transmission according to this invention, Fig. 2 is a sectional view taken along the line - in Fig. 1, and Fig. 3 shows the main part of the same. FIG. 10...Case, 12...3-speed and 4-speed forkshaft, 13...5-speed and reverse forkshaft, 21...5-speed and reverse shift head, 22...5-speed shift fork, 23...
...Reverse shift fork, 26...Connection roller.

Claims (1)

[Scope of utility model registration request] In a shift mechanism of a vehicle transmission in which a 5-speed shift and a reverse shift are arranged facing each other, a 5-speed and-reverse fork shaft is slidably supported by a case, and a 5-speed and-reverse fork shaft is fixed to the 5-speed and reverse fork shaft. A reverse shift head, a 5-speed shift fork fixed to a 5-speed and reverse fork shaft, a 5-speed and reverse fork shaft, and a 3-speed and 4
It is slidably attached to the speed fork shaft,
A reverse shift fork that is disengaged from the 5th gear and reverse shift head when shifting to 5th gear, and is engaged with the 5th gear and reverse shift head when shifting to reverse gear, and a reverse shift fork that is built into the reverse shift fork and is built into the reverse shift fork and is disengaged from the 5th gear and reverse shift head when shifting to 5th gear. A shift mechanism for a vehicle transmission, comprising: a connecting roller that integrates a 3-speed and 4-speed fork shaft, and integrates a reverse shift fork with a 5-speed and reverse fork shaft during a reverse shift; The reverse shift fork extends in the longitudinal direction of the 5-speed and reverse fork shaft and straddles the 5-speed and reverse shift head, and is attached to the 5-speed and reverse fork shaft at both ends in the direction of extension, and reverses the reverse shift of the reverse shift fork. A shift mechanism for a vehicle transmission, characterized in that the side assembly portion is an engaging portion with the 5-speed and reverse shift head.