JPS642172Y2 - - Google Patents

Description

[Detailed description of the invention] This invention has a gear arrangement in a gear transmission that consists of a pair of gears (fourth speed This invention relates to a shift reversal mechanism for adapting the shift pattern to a normal shift pattern when only the shift pattern (5th speed) is irregular.

Conventional shift reversal mechanisms include those in which another forkshaft is added parallel to the forkshaft that requires shift reversal, and a reversal lever is provided between both of these fork shafts, and the shift fork that needs to be reversed is Some are connected to each other by a reversing lever that has a pivot point in the transmission case. In the former case, it is difficult to secure space for incorporating the additional forkshaft, and the weight increases significantly. Furthermore, in the latter case, the reversing lever must be assembled after the gears and shift forks have been assembled into the transmission case, making the work difficult.

In view of these conventional circumstances, this invention was developed to create a shift reversal mechanism that can be assembled independently of the gears and shift forks incorporated in the transmission case, and is advantageous in terms of securing space and increasing weight. Its purpose is to provide.

In order to achieve the above object, this invention is constructed as follows. In FIG. 1, a shift and select lever shaft 2 is provided within a shift lever housing 1, and a shift inner lever 3 is supported on the shaft of this shaft 2. As shown in FIG.
This shift and select lever shaft 2 is
When the transmission is shifted, the shift inner lever 3 is rotated about its axis together with the shift inner lever 3.

On the other hand, another shaft 8 is disposed in the housing 1 in parallel with the shift and select lever shaft 2. A reversing lever 9 is supported on the axis of the shaft 8 so as to be rotatable together with the shaft 8 or relative to the shaft. One end of this reversing lever 9 is positioned to engage or be engageable so as to be interlocked with the shift inner lever 3, and the other end is connected to the shift head 11 of the fork shaft 10 to perform the reversing operation. It is positioned to engage or be engageable.

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

A shift lever housing 1 shown in FIG. 1 is fixed to a transmission case 13 with bolts 14 so as to cover the opening thereof. That is,
The shift lever housing 1 is fixed to the transmission case 13 with its internal space communicating with the inside of the transmission case 13. The shift and select lever shaft 2 is disposed inside the housing 1 so as to be rotated about an axis through movement of a shift control system by a shift operation of a speed change lever (not shown). The shift inner lever 3 supported on the shaft of the shaft 2 rotates together with the shaft 2 by means such as spline fitting, and moves along the shaft 2 in the axial direction (in the direction of the arrow in FIG. 2). Can move. Note that if the shaft 2 is supported movably in the axial direction with respect to the housing 1, the shift inner lever 3 may be fixed to the shaft 2.

The shift inner lever 3 has an arm 3a extending downward in FIG. 1, and an arm 3b extending leftward at a displacement angle of about 90 degrees with respect to the arm 3a. The tip of the arm 3a extending downward is positioned so as to be engageable with a shift head 5 of a forkshaft 4 for first and second speeds, for example, which does not require shift reversal. Furthermore, a recess 3b' that engages with a reversing lever 9, which will be described later, is formed at the tip of the arm 3b extending leftward.

Further, a select pin 6 is provided in a part of the housing 1, and rotation around an axis is applied to the select pin 6 through the operation of a select control system in response to a select operation of a gear shift lever. A select inner lever 7 is fixed to the end of the select pin 6 located inside the housing 1, and the tip of this lever engages with a part of the shift inner lever 3, as is clear from FIG. ing. Therefore, when the select inner lever 7 rotates around the axis of the select pin 6 due to the select operation, the shift inner lever 3 slides in the direction of the arrow in FIG. 2 along the shift and select lever shaft 2 in conjunction with this. You will have to operate it.

Further, a reversing lever 9 is supported on the shaft of a shaft 8 which is disposed inside the housing 1 in parallel with the shift and select lever shaft 2 described above. This reversing lever 9 is rotatable about its axis together with or relative to the shaft 8, and this lever 9 has an angle of displacement of approximately 90° from the arm 9a extending downward in FIG. and an arm 9b extending to the right. The tip of this downwardly extending arm 9a is always engaged with a shift head 11 of a forkshaft 10 for, for example, a fourth or fifth speed, which is to perform a shift reversal. The tip of the arm 9b extending rightward is positioned so as to be able to engage with a recess 3b' formed at the tip of the arm 3b of the shift inner lever 3.

In the shift reversal mechanism configured as described above, assuming that the shift inner lever 3 is now in the select position for 1st speed and 2nd speed, the tip of one arm 3a is used for the 1st speed, which does not require shift reversal. - It is engaged with the shift head 5 of the second-speed forkshaft 4, and the other arm 3b is in a free state (see Fig. 2). In this selected state,
When the shift inner lever 3 is shifted in the direction of arrow A in FIG. 1, the fork shaft 4 moves to the right in FIG. When operated in direction B, the forkshaft 4 moves to the left in FIG. 1 (direction of shift to second speed).

In this way, shifts in the first and second speeds can be obtained, but the forkshaft 10 for the fourth and fifth speeds, which requires shift reversal, can be shifted to the right in FIG. 5th gear is obtained, and 4th gear is obtained by moving to the left. That is, in this forkshaft 10, compared to the forkshaft 4 for first speed and second speed (including other forkshafts not shown), the shift directions on the high side and the low side are reversed.

Therefore, from the above select state to 4th and 5th gear.
When the select operation for speed is performed, the select inner lever 7 rotates through the select pin 6, and as a result, the shift inner lever 3 is slid in the direction of the arrow in FIG. 2 as described above. Ru. As a result, the tip of one arm 3a of the shift inner lever 3 is disengaged from the shift head 5 of the fork shaft 4 and becomes free, and at the same time, the recess 3 at the tip of the other arm 3b is released.
b' engages with the tip of the arm 9b of the reversing lever 9.
In this select state, when the shift inner lever 3 is operated in the direction of arrow A in FIG. 1, the forkshaft 10 is shifted to the left in FIG. ), and when the shift inner lever 3 is operated in the direction of arrow B, the forkshaft 10 moves to the right in FIG. 1 (the direction of shifting to the fifth gear).

In this way, the shift operation of the shift inner lever 3 is transmitted to the forkshaft 10 in a reversed manner, and the shift pattern of the gear shift lever (not shown) is transmitted to the forkshaft 10 when other forkshafts (for example, the first
This corresponds to the case of the forkshaft 4) for high speed and second speed.

If the reversing lever 9 is configured to be slidable in the axial direction with respect to the shaft 8, the tip of the arm 9b of the reversing lever 9 can be connected to the shift inner lever 3.
It is also possible to permanently connect the arm 3b to the tip of the arm 3b. In this case, the reversing lever 9 is also moved by the selection operation of the shift inner lever 9, and the arm 9a engages with the shift head 11 of the forkshaft 10 only when selecting the fourth or fifth speed.

Since the shaft 8 of the reversing lever 9 is supported by the shift lever housing 1, these can be assembled completely independently of the transmission case 13 side, and then the housing 1 is attached to the transmission case 13.
It should be fixed to . Furthermore, the reversing lever 9 and its shaft 8 have a compact design that utilizes the space within the housing 1. In this way, the present invention incorporates the components of the shift reversal mechanism into the shift lever housing, completely independent of the gears of the transmission, the shift fork, etc., which simplifies the assembly work, and also allows these components to be easily assembled. There is no need to secure space for assembling additional parts within the transmission case, making it compact and reducing weight increase.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention, and FIG. 1 is a sectional view showing the inside of the shift lever housing of the transmission;
FIG. 2 is a sectional view taken along the line -- in FIG. 1. DESCRIPTION OF SYMBOLS 1...Shift lever housing, 2...Shift and select lever shaft, 3...Shift inner lever, 8...Shaft, 9...Reversing lever, 10...Fork shaft requiring shift reversal, 11...Shift head.

Claims (1)

[Claims for Utility Model Registration] A shift lever housing fixed to a transmission case and having a space communicating with the inside of this case, a shift and select lever shaft provided in this shift lever housing, and a shift lever housing of this shaft. In a gear transmission equipped with a shift inner lever supported on a shaft and rotated around the axis of the shaft by a shift operation of the transmission, a separate shift and select lever shaft is provided within the shift lever housing in parallel with the shift and select lever shaft. A shaft is disposed, and a shift reversal lever is supported on the shaft of the shaft so as to rotate together with the shaft or relative to the shaft,
One end of this reversing lever is positioned to engage or be engageable so as to be interlocked with the shift inner lever, and the other end is engaged or engageable with the shift head of the forkshaft that is to perform the reversing operation. A shift reversal mechanism for a gear transmission, characterized in that the shift reversal mechanism is positioned so that it can be moved.