JP2606504Y2 - Speed change device for mobile farm machine - 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 operation device having a structure in which a gear shift mechanism for a traveling unit and a power take-off (PTO) unit is provided in the same transmission case in a mobile agricultural machine.

[0002]

2. Description of the Related Art It has been known that a gear change can be performed between a traveling portion and a power take-out portion with a single change lever.

[0003]

However, in the prior art, for example, when a work machine such as a rotary is driven from a power take-out shaft of a management machine, the power take-out shaft can be shifted even in a reverse position. However, the rotary was driven during reverse driving, which was very dangerous. Therefore, in order to work safely, when the traveling unit is in the reverse position, the rotary unit cannot be shifted, and conversely, when the rotary unit is other than neutral, the traveling unit cannot be shifted backward. The structure was desired.

[0004]

The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described. In a mobile agricultural machine having a traveling transmission mechanism and a PTO transmission mechanism in the same transmission case, one end of the traveling transmission shifter shaft 2 and one end of the PTO transmission shifting shaft 3 are parallel to the same direction outside the transmission case 1.
To protrude, in parallel with both the shifter shaft projecting the pivot shaft 5, the end portion of the該枢shaft 5, Chi comprising two faces in plan view L-shape
One end of the first side surface of the edge plate 4 is
Pivots with the surface perpendicular to the pivot axis,
At the other end, a vertical surface 4 which is the second surface of the change plate 4
a, and horizontal surfaces 4c, 4c further projecting from the vertical surface 4a.
Is formed obliquely in the center of the vertical surface 4a.
The open and fitted to pin 7 of the the long hole 4b is the shifter shaft 3 by Ri突 set, to allow the PTO transmission with sliding shifter shaft 3 on the left and right by the vertical rotation of the change plate 4, The lower part of the change lever 8 is inserted and pivotally supported on the horizontal surface 4c, and the speed change plate 9 is fixed to the change lever 8 on the horizontal surface 4c and extends toward the shifter shaft. A slot 9a is inserted into the end of the
The shift lever 8 is opened in the direction in which the rate 9 extends , and penetrates a pin 10 erected vertically from the shifter shaft 2 through the elongated hole 9a, and the change lever 8 is rotated about the pivotal support of the horizontal surface 4c.
In this way, a shift speed is made possible, and a restriction hole 4d into which the shifter shaft 2 is fitted is opened in a side surface of the change plate 4. The restriction hole 4d is located at a position where the PTO shift is neutral, and the shifter shaft 2 It is configured so as to match.

[0005]

The operation of the present invention will be described. Shifter shaft 2
The gear is moved through the speed change plate 9 and the pin 10 by the left and right rotation of the change lever 8, and is shifted. The shifter shaft 3 moves through the vertical surface 4a of the change plate 4 and the pin 7 by the up and down rotation of the change lever 8 to change the speed. If the PTO shift is neutral and the change lever 8 is rotated to set the traveling shift to reverse, the shifter shaft 2 can be inserted into the restriction hole 4d to perform reverse shift. If the PTO shift is other than neutral, the shifter shaft can be shifted. 2 is in contact with the side surface of the change plate 4 so that the reverse gear cannot be shifted.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The problems to be solved and means to be solved of the present invention are as described above. Next, the specific structure of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a plan view of the speed change device of the present invention, FIG. 2 is a side view thereof, and FIG. 3 is a rear view of a change plate of the speed change device.

Referring to FIGS. 1 to 3, the configuration of the present invention will be described for the case where a mobile farming machine is a management machine. In the transmission case 1, a gear-sliding traveling transmission mechanism and a PTO
A transmission mechanism is housed, and a shifter shaft 2 for traveling speed and a shifter shaft 3 for PTO speed shifting for sliding the sliding gear for shifting are horizontally mounted on the upper portion of the transmission case 1 in parallel. One end of each of the shifter shafts 2 and 3 protrudes outward from the transmission case 1, and a pivot shaft 5 is provided at a front portion thereof so as to project in parallel with the shifter shafts 2 and 3. And a change plate composed of two L-shaped surfaces in plan view
One end of the side surface, which is the first surface of the fourth, is pivotally supported. The change plate 4 has an L-shape in plan view and has a second rear side.
The vertical surface 4a is a U-shape when viewed from the side, and
The surfaces 4c are formed so as to protrude upward and downward. The vertical surface 4a
As shown in FIG. 3, a long hole 4b is opened obliquely in the center of the hole, and a pin 7 projecting rearward from the shifter shaft 3 penetrates through the long hole 4b. , The shifter shaft 3 slides left and right, and P
This enables a TO shift.

[0008] Also, from the vertical surface 4a which is the second surface.
The lower portion of the change lever 8 is inserted and pivotally supported on the horizontal surfaces 4c projecting rearward, and the speed change plate 9 fixed to the change lever 8 is welded and fixed on the upper horizontal surface 4c. It extends forward. An elongate hole 9a is opened in the front part of the transmission plate in the front-rear direction, and a pin 10 standing upright from the shifter shaft 2 passes through the elongate hole 9a. When the change lever 8 is rotated left and right, the shifter shaft 2 slides left and right so that the traveling speed can be changed. Even if the PTO shift is performed by rotating the change lever 8 up and down, there is no change due to the long hole 9a, and no running shift is performed.

A restricting hole 4d slightly larger than the diameter of the shifter shaft 2 is opened in the side surface of the change plate 4, and the restricting hole 4d is located at a position where the PTO shift is neutral (vertical rotation is at the center). When the change lever 8 is turned to the reverse (R) side while the PTO shift is neutral, the shifter shaft 2 is inserted into the regulating hole 4d so that the reverse shift can be performed. And PT
When the traveling shift is rotated to the reverse side when the O shift is not neutral, the end of the shifter shaft 2 abuts on the change plate 4 so that the reverse shift cannot be performed.

[0010]

[Effect of the Invention] The present invention is constructed as described above, and has the following effects. First, running speed and P
It is possible to perform a TO-gear restraint system by using an elongated hole 4b formed in an L-shape in plan view, a restriction hole 4d opened on a side surface of the change plate 4, and an elongated hole 9a opened on the shift plate 9. As a result, a simple and compact configuration can be achieved. Second, the operation of the change plate 8 and the change plate 4 by the change lever 8 is only vertical rotation about the pivot shaft 5 and left and right rotation about the lower part of the change lever 8. , The possibility of malfunction of the change plate 4 and the speed change plate 9 is low,
It is less likely that excessive operating force is applied to the shifter shaft 2 and the shifter shaft 3.

[Brief description of the drawings]

FIG. 1 is a plan view of the speed change operation device of the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is a rear view of a change plate of the speed change operation device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transmission case 2 Shifter shaft for traveling speed change 3 Shifter shaft for PTO speed change 4 Change plate 4d Restriction hole 8 Change lever 9 Shift plate

Claims (1)

(57) [Scope of request for utility model registration] 1. In a mobile agricultural machine having a traveling transmission mechanism and a PTO transmission mechanism in the same transmission case, one end of a traveling transmission shifter shaft 2 and one end of a PTO shifting shifter shaft 3 are positioned outward of the transmission case 1. Flat in the same direction
Protruding in a row, and protruding the pivot shaft 5 in parallel with both shifter shafts,
The end of the pivot shaft 5 is formed of two L-shaped surfaces in plan view.
One end of the side surface, which is the first surface of the change plate 4, is
Pivot with the side surface perpendicular to the pivot axis,
At the other end is a vertical surface which is the second surface of the change plate 4
4a, and horizontal surfaces 4c, 4 further projecting from the vertical surface 4a.
c is formed in the center of the vertical surface 4a.
The b open, and fitting the pin 7 in the long hole 4b is the shifter shaft 3 by Ri突 set, allows the a PTO transmission with sliding shifter shaft 3 on the left and right by the vertical rotation of the change plate 4 Further, in the horizontal plane 4c is inserted pivoting the lower portion of the change lever 8, by fixing the shift plate 9 to the change lever 8 on the horizontal plane 4c is extended to the shifter shaft side, the shifter shaft of the speed-change plate 9 Shift the long hole 9a at the end on the side
The opening is opened in the direction in which the plate 9 extends , and a pin 10 which stands vertically from the shifter shaft 2 penetrates the elongated hole 9a, and the change lever 8 is rotated about the pivotal support of the horizontal surface 4c.
In this way, a shift speed is made possible, and a restriction hole 4 d into which the shifter shaft 2 is fitted
At the position where the PTO shift is neutral,
A shift operating device for a mobile agricultural machine, wherein the shift operating device is configured to coincide with the shifter shaft 2 in a side view.