JPS6131219Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shift rod interlock device.

As is well known, the gear shifting operation of a vehicle such as a tractor is
This is done by moving a shift rod equipped with a shifter operating means in the axial direction with an operating lever, moving a shifter provided on the main shaft or sub-shaft, etc. in the axial direction, and selectively meshing the shifter with a predetermined gear. .

When a plurality of the above shift rods are provided, if the rods move simultaneously, a plurality of gear trains will be generated and the gears will be damaged. To prevent this, an interlock device is provided so that when one rod is operable, the other rod is immovable.

Conventional interlock devices have complex structures and are difficult to assemble, resulting in high costs.

Therefore, the present invention has a simple structure and is easy to assemble.
Another object of the present invention is to provide a shift rod interlock device that can perform interlock reliably. Therefore, the objective is to have two shift rods equipped with shifter operation means mounted on parallel axes so as to be movable in the axial direction, pins protruding from the same side of both shift rods, and the pins being engaged with each other. A lock plate having an elongated hole is pivotally attached to the fixing member so as to rotate along the same side of the rod, and the elongated hole into which the one pin is fitted is connected to the elongated hole along the rod axis direction and the plate. The long hole is formed by intersecting the circular arc long hole concentric with the rotation center in a cross shape, and the long hole into which the other pin is fitted is formed as a long hole in a direction approximately perpendicular to the rod axis direction. At the point.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a transmission case, which constitutes a part of the vehicle body of the tractor.
Reference numeral 2 denotes a main shift operation lever, which protrudes from the upper surface of the transmission case 1 at approximately the center in the left-right direction. 3
is a PTO shift operation lever, which is provided on the upper part of the operation shaft 4 that protrudes from the upper surface of the case 1 on one side in the left-right direction.

The operating shaft 4 is rotatably supported by the mission case 1 in a vertical axis position so as to be vertically slidable. The PTO operating lever 3 is rotatable around the operating shaft 4, but is pivoted to a bracket 5 that cannot be moved up and down, and the operating shaft 4 is attached to the operating lever 3.
The top portion is pivotally connected via an elongated hole 6.

An L-shaped arm 7 is fixed to the lower end of the operating shaft 4.
A spherical hand 8 is provided on the arm 7 to protrude orthogonally to the axial direction of the operating shaft.

As shown in FIGS. 3 and 4, a slide pin 9 is attached to the side wall of the transmission case 1 near the spherical hand 8.
is fixed. A T-shaped sliding tube 10 is fitted onto the slide pin 9 so as to be slidable and rotatable in the axial direction. Fitting portion 11 at one end of the T-shape of the sliding tube 10
The spherical hand 8 is fitted into the spherical hand 8. Furthermore, sliding pipe 1
0, a shift lever 12 is fixedly installed and protrudes downward.

Shift rods 13 and 14 are mounted on the partition wall 15 of the mission case 1 so as to be slidable in the axial direction in the longitudinal direction in parallel to the upper and lower sides. Engagement bodies 16 and 17 are fixed to the front ends of the shift rods 13 and 14, respectively. An engaging portion 18 having a U-shaped cross section is provided on opposing surfaces of both engaging bodies 16 and 17, and the shift lever 12 projects and engages with the engaging portion 18. This shift lever 12 is formed in a shape to engage with an engaging portion 18 of either one of the engaging bodies 16 or 17.

In the middle of the two shift rods 13 and 14, there is a shift fork 19, which is a shifter operating means.
20 are fixedly installed.

As shown in FIGS. 5 to 7, the shift forks 19 and 20 are connected to the shifter 2 provided on the transmission shaft
2 to move the shifter 22 in the axial direction. The boss portions 23 and 24 of the shift forks 19 and 20, which are fitted onto the shift rods 13 and 14, have lock pins 2 that protrude to the same side.
5 and 26 are provided. This lock pin 2
5 and 26 protrude to face the side wall of the mission case 1.

27 is a lock plate, lock pins 25, 2
The shift rods 13 and 14 are rotatably connected to a pivot shaft 28 fixed to the side wall of the transmission case 1 so as to move up and down along the same side surface of the shift rods 13 and 14 on which the shift rods 6 are provided. This lock plate 27 is provided with a first elongated hole 29 and a second elongated hole 30, and the lock pins 25, 26 are fitted into the elongated holes 29, 30, respectively.

The first elongated hole 29 includes an elongated hole 29a along the axial direction of the upper shift rod 13 and a lock plate 27.
The circular arc elongated hole 29b, which is concentric with the center of rotation, intersects in a cross shape.

The second elongated hole 30 is formed in an elongated hole substantially perpendicular to the axial direction of the lower shift rod 14.

According to the above embodiment of the present invention, by rotating the PTO shift operating lever 3 left and right, the operating shaft 4 connected to the lever 3 is rotated. This rotation causes the spherical grip 8 at the lower end of the operating shaft 4 to rotate, and the sliding tube 10 fitted into the spherical grip 8 moves in the axial direction of the slide pin 9. Due to this axial movement, the shift lever 12 fixed to the sliding tube 10 moves the engaging body 1
It moves from side to side within the engaging portions 18 of 6 and 17 and engages with either of the engaging bodies 16 or 17.

Next, by rotating the PTO speed change operation lever 3 in the vertical direction, the operation shaft 4 is moved up and down, and the sliding tube 10 is thereby rotated around the slide pin 9 via the spherical hand 8. This rotation causes the shift lever 12 to swing back and forth, and the shift lever 1
2 is moved in the front-back direction. As a result of this movement, for example, the shift rod 13 to which the engaging body 16 is fixed is moved in the axial direction, so that the shift fork 19 is moved, and the shifter 22 is thereby moved to perform a gear change.

Now, the upper shift rod 13 in Figure 1
When the lock plate 27 moves in the axial direction, if the lock plate 27 is in the state shown in FIG. , the shift rod 13 can move freely. Now, when the lock pin 25 is at the position indicated by a in FIG. do. However, lock plate 27
is prevented from rotating by the engagement between the upper lock pin 25 and the first elongated hole 29, so it cannot rotate.
Therefore, the lower shift rod 14 cannot move in the axial direction, and an interlock is activated.

Next, insert the upper rod 1 into the neutral position of the first elongated hole 29.
3, that is, when the lock pin 25 is located at position b in FIG. Then, the lock pin 25 of the upper rod 13 fits into the circular arc elongated hole 29b of the first elongated hole 29. However, in the levered state, the upper shift rod 13 is unable to move in the axial direction due to the engagement between the circular arc elongated hole 29b and the lock pin 25, and an interlock is activated.

As described above, the present invention has an extremely simple structure in which a long hole is provided in the lock plate and the lock pin of the shift rod is engaged, and interlock can be achieved reliably.The simple structure also facilitates assembly and costs. This is something that is intended to bring down the situation.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a side sectional view, Fig. 2 is a plan view, Fig. 3 is a sectional view taken along the line of Fig. 1, Fig. 4 is a perspective view of the lower part of the operating shaft, and Fig. 5 is a perspective view of the operating shaft below. The figure is a sectional view taken along the - line in Fig. 1, and Fig. 6 is a - line sectional view in Fig. 1.
7 is a sectional view taken along the - line in FIG. 6. 1... Mission case, 13, 14... Shift rod, 19, 20... Shifter operating means, 2
5, 26...Pin, 27...Lock plate, 2
9, 30... Long hole, 29a... Long hole along the axial direction, 29b... Circular long hole.

Claims (1)

[Scope of utility model registration request] Two shift rods equipped with shifter operating means are mounted on parallel axes so as to be movable in the axial direction, and pins are protruded from the same side of both shift rods, and a lock plate is provided with elongated holes into which the pins are fitted. The elongated hole, which is pivotally attached to the fixed member so as to rotate along the same side of the rod, and into which the one pin is fitted, includes an elongated hole along the rod axis direction and an arcuate elongated hole concentric with the rotation center of the plate. An interlock device for a shift rod, characterized in that the long hole is formed in a cross-shaped long hole, and the long hole into which the other pin is fitted is formed in a direction substantially perpendicular to the rod axis direction. .