JP2894123B2 - Shifting device for manual transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shift device for a manual transmission of a type having an interlock mechanism functioning for shift operation of a fork shaft and having a fixed guide shaft separately from the fork shaft.

[0002]

2. Description of the Related Art A shift device of this kind is disclosed in
-8898. The shift device has a guide shaft parallel to the fork shaft, and the guide shaft is fixed to the transmission case in both the direction around the axis and the direction of the axis. FIG. 3 shows a guide shaft fixing means having substantially the same structure as that of the above publication. As is apparent from this drawing, a groove 92 is formed on the outer periphery of the guide shaft 90, and a lock plate 96 fixed to the transmission case 10 by bolts 94 is engaged with the groove 92.

[0003]

In the above-mentioned fixing means, in addition to forming the groove 92 for the guide shaft 90, a screw hole for tightening the bolt 94 to the transmission case 10 must be formed. Further, in order to fix the guide shaft 90, it is necessary to newly add a bolt 94 and the lock plate 96. As a result, the cost is increased, and the assembling work of the guide shaft 90 becomes complicated. A technical problem of the present invention is to reduce the number of processing steps and the number of parts for fixing a guide shaft to a transmission case, thereby reducing costs and simplifying an assembling operation.

[0004]

In order to solve the above-mentioned problems, a shift device for a manual transmission according to the present invention is configured as follows. That is, a plurality of fork shafts are supported with respect to the transmission case so as to be shiftable in a direction along each axis, and forks remaining when any one of these fork shafts is shifted. A shift device for a manual transmission, comprising an interlock mechanism for holding a shaft at a neutral position, and a guide shaft parallel to each of the fork shafts being fixed to the transmission case. The interlock hole of the interlock mechanism is extended along the center line thereof, and a support hole for the guide shaft is formed in the transmission case in communication with an extended portion of the interlock hole, A lock hole is formed on the outer periphery of the guide shaft at a portion inserted into the support hole, and the lock hole is formed with the lock hole. Serial locking pin is assembled in a state where the written fits constantly each of the extension of the interlock hole.

[0005]

According to this structure, when the lock pin is fitted into each of the extended portion of the interlock hole in the transmission case and the lock hole of the guide shaft, the guide shaft is moved relative to the transmission case. Are fixed in each of a direction along the axis and a direction around the axis. In other words, the fixation of this guide shaft
It is only necessary to slightly extend the interlock hole, process the lock hole for the guide shaft and newly install one lock pin, and the number of processes and the number of parts are reduced.

[0006]

Next, an embodiment of the present invention will be described with reference to FIGS. FIG. 2 is a sectional view of the shift device of the manual transmission, and FIG. 1 is an enlarged sectional view of a part of FIG. 2. The three fork shafts 20 to 22 shown in these drawings are respectively arranged in parallel, and are supported on the transmission case 10 individually so as to be shiftable in a direction along its axis. Shift heads 24-26 are fixed to the ends of these fork shafts 20-22. Then, a shift and select lever is selectively engaged with one of the shift heads 24 to 26 by a select operation and a shift operation of a shift lever (not shown),
The fork shaft is shifted along the axis.

[0007] Among the three fork shafts 20 to 22, the fork shaft 20 for the first speed and the second speed located at the center.
A first-second speed shift fork 30 and a third-speed fourth speed shift fork 31 are fixed on the respective axes of a third-speed fourth-speed fork shaft 21 adjacent to one side thereof. Also, a fifth speed-reverse fork shaft 22 adjacent to the other side of the first speed-second speed fork shaft 20
Has a shift fork 32 for 5 speed formed integrally with the shift head 26, and a shift fork 33 for reverse that is relatively slidable on the axis of the fork shaft 22 in a direction along the axis thereof. I have. Accordingly, the shift forks 30 for the first speed and the second speed, the shift forks 31 for the third speed and the fourth speed, and the shift fork 32 for the fifth speed are operated to shift together with the respective fork shafts 20 to 22. However, for the reverse shift fork 33, the fork shaft 22 is shifted leftward (reverse shift direction) from a neutral position shown in the drawing by a function of a one-way mechanism 60 described later, and is returned from that shift position. Only occasionally moves with this fork shaft 22.

Next, the interlock mechanism 40 for the fork shafts 20 to 22 will be described. As is clear from FIG. 1, an interlock hole 42 is formed in a wall 10A on one side of the transmission case 10 on which the fork shafts 20 to 22 are supported, in a direction perpendicular to the axis of each of the fork shafts 20 to 22. ing. The interlock holes 42 communicate with the support holes 12 to 14 of the fork shafts 20 to 22 formed in the wall 10A. Further, in each of the fork shafts 20 to 22, interlock recesses 46 to 48 are formed at positions corresponding to the interlock holes 42 in a neutral state, and the interlock holes 42 are provided between the fork shafts 20 to 22. , Interlock pins 44 and 45 that engage with the concave portions 43 to 45 are respectively incorporated. Now, for example, if the first-speed / second-speed fork shaft 20 is shifted from the neutral position shown in the right or left direction, the interlock pin 44 moves by the action of the slope of the interlock recess 46 to move to the third speed. The interlock recess 47 of the fourth speed fork shaft 21 is engaged, and the interlock pin 45 remains engaged with the interlock recess 48 of the fifth speed reverse fork shaft 22. This gives 3
The fourth speed-speed fork shaft 21 and the fifth speed-reverse fork shaft 22 are held at neutral positions. This is the same when the fork shafts other than the first and second speed fork shafts 20 are shifted, and the other two fork shafts are held at the neutral position.

On the wall 10A of the transmission case 10, a guide shaft 50 is provided on each of the fork shafts 20 at a position adjacent to the fifth speed-reverse fork shaft 22.
To 22 are supported in parallel. On the other hand, the interlock hole 42 extends along the center line thereof, and the extended portion 43 communicates with the support hole 16 formed in the wall 10A to support the guide shaft 50. A lock hole 52 is formed in the guide shaft 50 at a position corresponding to the extension 43 of the interlock hole 42. A lock pin 5 is provided between the inside of the lock hole 52 and the outer peripheral surface of the fifth speed-reverse fork shaft 22.
4 are incorporated. That is, the lock pin 54 is always fitted into each of the extension portion 43 of the interlock hole 42 and the lock hole 52 of the guide shaft 50, so that the guide shaft 50 is aligned with its axis with respect to the wall 10 </ b> A of the transmission case 10. Are fixed both in the direction along the axis and in the direction around the axis.

The guide shaft 50 is inserted into the reverse shift fork 33, and the shift fork 33 is slidably supported relative to the fifth speed-reverse fork shaft 22 and the guide shaft 50, respectively. It has been dressed. In a ball hole 62 formed in the reverse shift fork 33, a ball 64 is incorporated between the fork shaft 22 and the guide shaft 50, and the ball 64 is selected for both shafts 22, 50. The recesses 66 and 67 are formed to engage with each other. 5th speed-
A snap ring 68 that transmits only the operation of the fork shaft 22 in the reverse shift direction (left direction) to the shift fork 33 is mounted on the shaft of the reverse fork shaft 22. This constitutes the one-way mechanism 60 for the above-described reverse shift operation. That is, the fifth speed-reverse fork shaft 22
Is operated in the reverse shift direction (left direction) from the neutral position in the drawing, the reverse shift fork 33 is also operated in the same direction through the snap ring 68. The movement of the shift fork 33 causes the ball 64 to engage with the concave portion 66 of the fork shaft 22,
Thus, the fork shaft 22 and the shift fork 33 are held in an integral relationship. Therefore, the fork shaft 22
Is operated from the reverse shift position, the shift fork 33 is operated together. On the other hand, when the fork shaft 22 is operated from the neutral position in the fifth gear shift direction (rightward), the reverse shift fork 3
3 is at the position shown in the drawing, and the shift fork 32 for the fifth speed
Only the fork shaft 22 moves.

FIG. 2 shows a detent mechanism 70 for third speed and fourth speed and a detent mechanism 80 for reverse speed. The detent mechanism 70 for the third speed and the fourth speed is for performing a function of positioning each shift position of the third speed or the fourth speed and the neutral position, and the interlock hole 42 and the wall 10A of the transmission case 10 are formed in the transmission case 10. Detent ball 7 incorporated in the hole formed with its extension 43
It mainly includes a first and a spring 72 and three concave portions 74 formed on the outer periphery of the third-speed / fourth-speed fork shaft 21. On the other hand, the reverse detent mechanism 80 is for performing the function of positioning the reverse shift position and the neutral position, and includes a detent ball 81 and a spring 82 which are incorporated in holes formed in the reverse shift fork 33. And the guide shaft 5
And two concave portions 84 formed on the outer periphery of the main body.

According to the shift device having the above-described structure, the guide shaft 50, which is a component of the one-way mechanism 60 for the reverse shift operation and the detent mechanism 80 for the reverse shift, uses only one lock pin 54 for the transmission. It is fixed to the wall 10A of the case 10. Processing required for fixing the guide shaft 50 includes the extension 43 of the interlock hole 42 and the guide shaft 50.
It is only necessary to form the lock holes 52 described above.
The lock pin 54 can be assembled together with the interlock pins 44 and 45 of the interlock mechanism 40.
If the parts are common to the parts 4 and 45, it is possible to cope without increasing the types of necessary parts. Therefore, the number of parts is reduced,
In addition, the assembling work is also simplified.

[0013]

As described above, according to the present invention, the existing interlock hole is slightly extended, the lock hole for the guide shaft is processed, and the guide shaft is properly fixed to the transmission case only by newly installing one lock pin. Therefore, the number of processes and the number of parts are reduced, so that the cost can be reduced and the assembling operation can be simplified.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a part of a shift device.

FIG. 2 is a sectional view of a shift device.

FIG. 3 is a cross-sectional view showing a part of a conventional shift device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Transmission case 16 Support hole 20-22 Fork shaft 40 Interlock mechanism 42 Interlock hole 43 Extension 50 Guide shaft 52 Lock hole 54 Lock pin

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Akihiko Ikeda 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (56) References Japanese Utility Model Sho 63-60744 (JP, U) Japanese Utility Model Sho 58-28330 (JP, U) JP50-1057 (JP, B1) (58) Fields investigated (Int. Cl. ⁶ , DB name) F16H 61/26-63/38

Claims (1)

(57) [Claims] A plurality of fork shafts are supported on a transmission case so as to be shiftable in directions along respective axes, and one of these fork shafts is shifted. An interlock mechanism for holding a sometimes remaining fork shaft at a neutral position, and a shift device for a manual transmission in which a guide shaft parallel to the fork shafts is fixed to the transmission case separately from the fork shafts. An interlock hole of the interlock mechanism formed in the machine case extends along a center line thereof, and communicates with an extended portion of the interlock hole for the transmission case to support the guide shaft. A lock hole is formed on the outer periphery of the guide shaft at a portion to be inserted into the support hole. Hole and the interlock hole manual transmission shift device is characterized in that the lock pin is assembled in a state where the written fits constantly each of the extension of the.