JPS6331136Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an improvement in the shift operation position of a gear transmission.

(Prior Art) As shown in Japanese Utility Model Publication No. 57-9858, in the shift operation position of a gear transmission for an automobile, a shift lever shaft is rotatably supported in a transmission case, and a shift lever shaft is supported with respect to the shift lever shaft. Some have a shift inner lever fitted with a spline. In this case, the shift inner lever is displaced in the axial direction with respect to the shift lever shaft to select a predetermined shift fork by the shift operation of the change lever operated by the driver. Some shift gears are designed to shift to a desired shift position by rotating the shift inner lever. That is, for example, if the transmission has five speeds and its shift pattern is as shown in Fig.
Equipped with three shift forks: a shift fork, a second shift fork for 3rd and 4th speeds, and a 3rd shift fork for 5th speed and R (reverse).
The displacement of the change lever operated by the driver in the left-right direction in FIG.
The first shift fork is selected at _N1 , the second shift fork is selected at select position _N2 , and the third shift fork is selected at select position _N3 . And any select position N ₁
By displacing the change lever upward or downward in FIG. 1 from any one of the select positions _.about.N3 , the shift inner lever is rotated to reach a desired shift position.

Therefore, in such a transmission, when shifting from 3rd gear to 2nd gear, for example, as shown by the α line in Figure 1, 3rd gear → (shift) → N ₂ → (select) →N ¹ → (shift) → 2nd gear, etc.
It is necessary to operate the change lever in a crank motion.

However, some drivers perform a so-called diagonal shift operation in which the change lever is moved linearly from the 3rd gear position to the 2nd gear position, for example, and in this case, the driver may get stuck in the middle. A situation has often arisen in which the gear cannot be shifted to a desired shift position. That is, normally, a guide pin 5 is provided protrudingly on the shift inner lever, while a guide groove 6 having a shape corresponding to the shift pattern is provided on the transmission case as shown in FIG.
A guide plate 6 having a diameter of
For example, Fig. 2 β
When a diagonal shift operation is performed from 3rd gear to 2nd gear as shown by the line and gamma line, the guide pin 5 gets caught on the guide plate 6 as shown at point P in Figure 2, and this pull occurs. The reaction force caused by hanging is
This acts as a force that rotates the shift inner lever relative to the shift lever shaft, and the sliding resistance between the shift inner lever and the shift lever shaft becomes extremely large, causing the shift inner lever to shift to the select position midway.
It was becoming impossible to move to _N1 . This phenomenon occurs when changing from 2nd gear to 3rd gear,
It also occurs when shifting from 4th gear to 5th gear, but especially when shifting from 5th gear to 4th gear or from 3rd gear to 2nd gear, which is a downshift direction where the shift operation force is set to be large, as mentioned above. Problems arise.

(Purpose of the invention) The present invention has been made in consideration of the above-mentioned circumstances, and provides a gear shift operation position for a gear transmission that allows reliable gear changes even when a diagonal shift operation is performed. The purpose is to

(Structure of the invention) In order to achieve the above-mentioned object, in the present invention, the shift lever shaft is not only rotatable with respect to the transmission case, but also movable by a set amount in the axial direction. be.

Specifically, the configuration is as follows. That is, a guide plate in which a guide groove corresponding to the shift pattern is formed is provided in the transmission case, and a guide pin that fits in the guide groove is provided on the shift inner lever supported by the shift lever shaft in the transmission case. In a gear transmission in which the shift inner lever is operated in the axial direction and around the axis of the shift lever shaft to perform a select shift operation, the shift lever shaft is rotated within a set angle range by the transmission case. The shift inner lever is supported to be freely movable and movable in the axial direction within a set amount range, the shift inner lever is supported on the shift lever shaft so as to be slidable in the axial direction and unrotatable around the axis; A shift operation inner lever for slidingly operating the shift inner lever in the axial direction of the shift lever shaft is provided within the case, and a shift operation outer lever for rotating the shift lever shaft is provided outside the transmission case. It is configured as follows.

With this configuration, even if a diagonal shift operation is performed and the sliding resistance between the shift inner lever and the shift lever shaft becomes large and the shift inner lever becomes unable to slide relative to the shift lever shaft, The shift lever shaft itself is displaced in the axial direction with respect to the transmission case together with the shift inner lever, thereby making it possible to reliably shift to a predetermined shift position.

(Example) In FIGS. 3 and 4, 1 is an upper case that constitutes a part of the transmission case, and inside the transmission case, a shift lever shaft 2 and a shift rod 3 are arranged orthogonally to each other. It is set up.
This shift lever shaft 2 has both ends 2
At a and 2b, the shift rod 3 is held in the upper case 1 so as to be rotatable by a set angle and slidably by a set amount as will be described later, and the shift rod 3 is fixed to the mission case.

The shift lever shaft 2 has a spline section 2.
c is formed, and for the spline part 2c,
The cylindrical base end 4a of the shift inner lever 4 is spline-fitted, so that the shift inner lever 4 can slide in the axial direction with respect to the shift lever shaft 2 but cannot rotate around the axis. . A guide pin 5 is provided on the shift inner lever 4 so as to protrude toward the top wall of the upper case 1, while a guide plate 6 shown in FIG. 2 is fixed to the inner surface of the top wall of the upper case 1. ing. The guide pin 5 extends into the guide groove 6a of the guide plate 6, so that the shift inner lever 4 is only allowed to move along the shape of the guide groove 6a.

A lock stopper 7 is rotatably and slidably fitted into the spline portion 2c in series with the shift inner lever 4. This lock stopper 7 is
The select return spring 8 urges the shift lever shaft 2 to the left in FIG. The movement in the right direction in Figure 4 is
It has come to require a greater operating force than a movement to the left. The select return spring 8 is inserted between the lock stopper 7 and the stepped portion 2d of the shift lever shaft 2, and the shift lever shaft 2 is connected to the ball 9 of the click mechanism 9.
The displacement position in the left and right direction in Fig. 4 from a is the base point.
Select position usually corresponds to neutral position
_N2 , and FIG. 5 shows this neutral state.

Three shift forks 10, 11, 12, first to third, are slidably fitted into the shift rod 3, the first shift fork 10 is for selecting 1st and 2nd speeds, and the second shift fork 11 is for selecting 1st and 2nd speeds. , 3rd speed, and 4th speed selection, and the third shift fork 11 is for 5th speed and R selection. These three shift forks 1
0, 11, and 12 have engaging portions 10a, 11a, and 12a, respectively, at positions shifted in the left-right direction in FIG. is adapted to engage with any one of the engaging portions 10a to 12a. Of course, these first to third
The shift forks 10, 11, 12 shift from 1st to 5th gear depending on the displacement position to the left or right in FIG.
The vehicle is shifted to either speed or R. Of course, the displacement of each of the shift forks 10 to 12 in the left-right direction in FIG.
This is done by rotating clockwise or counterclockwise in FIG.

To explain the mechanism for sliding and rotating the shift inner lever 4, one end portion 2a of the shift lever shaft 2 slidably and rotatably passes through the upper case 1, and the one end portion 2a passes through the upper case 1 in a slidable and rotatable manner. A shift outer lever 13 as a shift operation outer lever is coupled to the portion 2a. Further, as shown in FIG. 3, a select lever shaft 14 is rotatably held in the Atsupa case 1, and a select inner lever 15 as a shift operation inner lever is attached to the inner end of the Atsupa case 1 of the select lever shaft 14. On the other hand, a select outer lever 16 is integrated at the outer end of the upper case 1. The tip of the select inner lever 15 extends into a forked portion 4c formed on the shift inner lever 4. The shift outer lever 13 and the select outer lever 16 are each connected to a change lever operated by the driver via a rod or wire (not shown).

The other end 2b of the shift lever shaft 2 is
It is rotatably and slidably fitted into the bearing cylinder portion 1a formed in the Atsupah case 1, and a notch groove 17 extending a predetermined length in the axial direction is formed in the side surface of the other end portion 2b. A dowel pin 18 held by the upper case 1 passes through the notched groove 17. This notch groove 17 is made longer by a dimension L than the diameter of the dowel pin 18, and in the state shown in FIG. 4, the dowel pin 18 is located on the left end side of the notch groove 17 in the figure. Therefore, the shift lever shaft 2 can be displaced leftward from the state shown in FIG. 4 with respect to the upper case 1 by this dimension L. This dimension L is larger than the stroke 1 corresponding to the distance required to move from the hook point P to the select position _N1 during the diagonal shift operation.

In addition, numeral 19 in FIG. 4 is a click mechanism for holding the shift fork at a shift position such as 3rd speed or 4th speed.

In the above configuration, when the change lever operated by the driver is displaced on a straight line passing through _N1 to _N3 in FIG. 1, this displacement causes the select outer lever 16, select lever shaft 14,
The signal is transmitted to the shift inner lever 4 via the select inner lever 15, and the shift inner lever 4 is
is displaced in this axial direction with respect to the shift lever shaft 2. This allows select position N ₁
~1st to 3rd shift fork 10 compatible with N ₃
-12 shift fork and shift inner lever 4 are engaged (selected).

Next, when the change lever is operated upward or downward in FIG. 1, the shift lever shaft 2, that is, the shift inner lever 4, is rotated clockwise or counterclockwise in FIG. 3 via the shift outer lever 13. Only the selected shift fork is displaced to the left or right in FIG.
The desired shift position is reached.

For example, when shifting from 3rd gear to 2nd gear, if the change lever is shifted diagonally as shown by the β and γ lines in Figure 2, the shift lever will shift as shown by point P in Figure 2. , the guide pin 5 may get caught on the guide plate 6. In this case, the reaction force due to the above-mentioned catching becomes a force that causes the shift inner lever 4 to rotate relative to the shift lever shaft 2, as shown by the arrow δ in FIG.
The sliding resistance between the two 4 and 2 may become large, making it impossible for the shift inner lever 4 to slide toward the select position N1 with respect to the shift lever shaft ₂ . However, in this case, due to the above-mentioned large sliding resistance, the shift inner lever 4 and the shift lever shaft 2 are entirely displaced to the left in FIG. 4 by one minute of the stroke required to shift to the select position _N1 . Therefore, the shift inner lever 4 can be moved to the desired select position _N1 (see FIG. 6), and subsequent shift displacement is possible. Then, when the shift lever shaft 2 is displaced to the left in FIG. It is displaced to the right in the figure and returned to its normal position.

FIG. 8 shows another embodiment of the present invention, in which when the shift lever shaft 2 is in the neutral position _N2 , notched grooves 17' are present on both sides of the knob pin 18, so that the shift lever shaft 2 can move in both axial directions with respect to the upper case 1, so that the select operation can be performed reliably even in the direction of upshifting, in the same way as in the case of downshifting from third gear to second gear as described above. It is.

(Effects of the invention) As is clear from the above, the invention has the following effects:
Even if a diagonal shift operation is performed, the select operation can be performed reliably, making it possible to smoothly shift gears to a desired shift position.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of a shift pattern of a transmission according to the present invention. FIG. 2 is a diagram showing how the guide plate and guide pin are caught when performing a diagonal shift operation. FIG. 3 is a longitudinal sectional view showing an embodiment of the present invention. FIG. 4 is a side sectional view of FIG. 3. FIG. 5 is a perspective view of the shift lever shaft portion. FIG. 6 is an enlarged sectional view of essential parts in an embodiment of the present invention. FIG. 7 is a sectional view taken along the line -- in FIG. 6. FIG. 8 is a sectional view corresponding to FIG. 6 showing another embodiment of the present invention. 1... Atsupa case, 2... Shift lever shaft, 2c... Spline section, 4... Shift inner lever, 5... Guide pin, 6... Guide plate, 13... Shift outer lever, 15... Select inner lever , 17, 17'...notch groove,
18... Notsukupin.

Claims (1)

[Claims for Utility Model Registration] A guide plate with a guide groove formed in a shape corresponding to the shift pattern is provided in the transmission case, and the guide plate is attached to the shift inner lever supported by the shift lever shaft in the transmission case. In a gear transmission that is provided with a guide pin that fits into a groove and operates the shift inner lever in the axial direction and around the axis of the shift lever shaft to perform a select shift operation, the shift lever shaft is connected to the transmission case. The shift inner lever is supported on the shift lever shaft so as to be freely rotatable within a set angle range and freely movable in the axial direction within a set amount range, and the shift inner lever is supported on the shift lever shaft so as to be slidable in the axial direction but not rotatable around the axis. A shift operation inner lever is provided inside the transmission case for slidingly operating the shift inner lever in the axial direction of the shift lever shaft, and the shift lever shaft is mounted outside the mission case. A speed change operation position for a gear transmission, characterized in that a speed change operation outer lever that is rotatably operated is provided.