JPS6125606Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention has two horizontal shafts placed vertically close to each other on one side below the pilot's seat provided at the rear of the aircraft, and a second horizontal shaft at each horizontal end of the horizontal shafts. The first lever and the second lever are installed with the first lever corresponding to the upper horizontal shaft positioned on the seat side, and the first lever is installed so as to protrude downward near one horizontal end of the upper horizontal shaft. Installation of a control lever on an agricultural tractor in which the arm is connected to an accelerator device installed at the front of the machine, and the second arm installed at the other lateral end of the lower horizontal shaft is connected to a hydraulic control valve installed under the seat. Regarding structure.

In this operating lever mounting structure, since the first and second levers are centrally arranged on one side of the operating seat, each lever is easy to operate.
Furthermore, since the first lever for operating the accelerator, which is frequently used, is located close to the driver's seat, this is convenient for use, but there is a problem as described below.

That is, since the first arm is provided that protrudes downward from near one horizontal end of the upper horizontal axis and is connected to the accelerator device, the connection mechanism (for example, link mechanism) between the first arm and the accelerator device can be operated easily. It is possible to avoid the connection mechanism from getting in the way of the worker by shifting the seat to one side, but the two horizontal shafts should be placed close enough together to allow the first arm to protrude downward. As a result, the operating feel of the first and second levers is markedly different, making them difficult to handle, and making it difficult to make the overall structure more compact.

The present invention aims to solve the above-mentioned problem, and is directed to one horizontal end portion of the lower horizontal shaft or the second
Since the lever is bent into a U-shape when viewed from the front and back to form a space for engaging the first arm, the lower horizontal axis and the upper horizontal axis can be moved up and down sufficiently. It is possible to bring them close together,
Eventually, the problems mentioned above were solved and it became possible to use it even better.

Embodiments of the present invention will be described in detail below with reference to the drawings.

Figure 1 shows the side view of an offset type tractor, and the
The figure shows a plane, with a pair of left and right front wheels 1a,
1b, a pair of left and right rear wheels 2a, 2b are installed, and an engine 3 and a longitudinally long transmission case 4 are juxtaposed in the front and back direction at a location offset to the left between the left and right wheels. ring 2
A pilot seat 5 is provided at a location offset to the right between seats a and 2b. The left and right front wheels 1a, 1b
is configured as a steering wheel whose direction can be changed by a rotary handle 6 provided at the front of the seat 5. The left and right rear wheels 2a, 2b are configured to be pivotally supported by the rear end of the transmission case 4 and driven by the output within the transmission case.

A first hydraulic cylinder is provided at the upper rear end of the mission case 4 (corresponding to the lower part of the seat 5) for lifting and lowering a working device (not shown) connected to the rear of the aircraft body using lift arms 7, 7. 8 is assembled and fixed, and along the left side surface of the mission case 4, a working device (not shown) connected to the longitudinally intermediate portion of the fuselage is moved through the lift arms 29, 29. A second hydraulic cylinder 9 is provided for raising and lowering the vehicle.

Pressure oil from a front hydraulic pump (not shown) is supplied to the cylinder case 8a via a hydraulic pipe 10, and this pressure oil is supplied to a bracket with an oil passage installed on one side of the cylinder case 8a. 11 into the relief valve 12, and then returned to the bracket 11 with an oil passage, from the bracket 11 to the first hydraulic control valve of the first hydraulic cylinder 8 provided at the lower part of the cylinder case 8a. 1
3, and the second hydraulic control valve 14 of the second hydraulic cylinder 9, which is assembled to the upper part of the bracket 11 so that at least a portion thereof overlaps the upper part of the cylinder case 8a in a plan view. It's summery.

An auxiliary bracket 15 is provided to protrude forward from the top of the cylinder case 8a, and at the protruding end of the bracket 15 (this corresponds to one side of the lower side of the seat 5), there are two brackets vertically adjacent to each other. Horizontal axis 1
6 and 17 are juxtaposed. These horizontal axes 16,1
An operating lever 18 of the first control valve 13 is fixed to the left end of the lower horizontal shaft 17 of the first control valve 7, and
Arm 1 attached to the right end of the lower horizontal shaft 17
9 is interlocked and connected to the operating arm 13a of the first control valve 13 via a rod 20, and the lever 1
The first hydraulic cylinder 8 is configured to extend and contract by swinging the cylinder 8 back and forth.

This valve 14 is located in front of the second hydraulic control valve 14.
An operating lever 21 is pivotally supported, and this lever 21 is connected to the control valve 14 and the second hydraulic cylinder 9 via a feedback link mechanism 22, so that the lever 21 can be operated in a swinging manner. Accordingly, the second hydraulic cylinder 9 is configured to expand and contract to a length corresponding to its swinging position.

A lever 2 is located at the left end of the upper horizontal shaft 16 and is positioned closer to the seat than the lever 18.
3 is fixed, and an arm 29 is attached in a downwardly protruding state, and this arm 29
is interlocked with an engine governor (not shown) as an accelerator device via a link mechanism 25, and by swinging the lever 23 back and forth, the engine rotational speed is determined based on the swinging position of the lever 23. It is configured to set. Further, a lever 18 attached to the lower horizontal shaft 17 is bent into a U-shape when viewed from the front and back to form a space for the arm 24 to engage.

Further, a plate body 27 in which a portion covering the second hydraulic control valve 14 and a lever guide portion in which a guide groove 28a of the lever 21 of this valve 14 is formed are integrally assembled and fixed to the control valve 14. There is. Further, this plate body 27 has a guide 28b for the lever 18 of the first control valve 13 and a guide groove 2 for the accelerator lever 23.
8c is also formed.

Further, the oil suction and drainage pipes 30a and 30b extending from the second control valve 14 are made of a rigid material, and are juxtaposed vertically and protrude from the lateral side wall portion of the control valve 14 on the inside of the body. After that, the rear side wall portion of the control valve 14 is bypassed, and the control valve 14 is guided forward along the lateral side wall portion of the outer side of the fuselage.

In the embodiment, the lever 18 is projected in a U-shape, but the lower horizontal shaft 17 may be bent in a U-shape to form a space for arm insertion.

[Brief explanation of the drawing]

The drawings show an embodiment of the operation lever mounting structure for an agricultural tractor according to the present invention, in which Fig. 1 is a side view of the agricultural tractor, Fig. 2 is a plan view thereof, Fig. 3 is a plan view of the lever mounting part, and Fig. 4 The figure is a front view, FIG. 5 is a rear view, and FIGS. 6 and 7 are schematic side views. 5... Pilot seat, 13... Hydraulic control valve, 16,
17...horizontal axis, 18...second lever, 19...second arm, 23...first lever, 24...first arm.

Claims (1)

[Scope of utility model registration request] Two horizontal shafts 16 and 17 are placed vertically close to each other on one side of the lower side of the pilot seat 5 provided at the rear of the aircraft, and one horizontal end of each of these horizontal shafts 16 and 17 has a
The first lever 23 and the second lever 18 are installed with the first lever 23 corresponding to the upper horizontal shaft 16 positioned on the seat side, and the upper horizontal shaft 16
The first one is installed protruding downward near one lateral end of the
The arm 24 is connected to the accelerator device provided at the front of the aircraft body, and the second arm 19 attached to the other lateral end of the lower horizontal shaft 17 is connected to the hydraulic control valve 1 provided below the seat.
3, in which one horizontal end portion of the lower horizontal shaft 17 or the second lever 18 is bent into a U-shape when viewed in the front-rear direction, and the first arm is engaged with the operating lever. An operating lever mounting structure for an agricultural tractor characterized by forming a space.