JPH032462Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention connects the engine and the transmission case through left and right frames, and interlocks the engine and the transmission case with a transmission shaft located between the left and right frames. The present invention relates to a steering operation structure for a conventional agricultural tractor, and more particularly relates to an improvement in the arrangement position of a steering box.

[Prior Art] In agricultural tractors having the above-described configuration, interference between the transmission shaft and the steering box is avoided by providing the steering box above or below the transmission shaft.

[Problem that the invention attempts to solve]

However, if the steering box is installed above the transmission shaft, the upper part of the steering box tends to be largely exposed on the step of the driving section, and there is a problem that it becomes difficult to keep the step flat and if it is exposed too much. This not only limited the driver's legroom, but also made it difficult to operate the pedals.

Furthermore, if the steering box is provided below the transmission shaft, the pitman arm, drag link, etc. of the case may protrude below the vehicle body and become an obstacle when driving, so improvements have been desired.

The present invention has been made in view of the above-mentioned circumstances, and has an object to provide a steering operation structure that solves the above-mentioned problems by rationally arranging the steering box.

[Means for solving problems]

A feature of the present invention is that a connecting member for mounting a vertically elongated power steering box with an operating shaft extending upwardly is provided on the inner surface of one of the frames, and the power steering box is connected to the transmission shaft and one of the frames. In the space between the two, the power steering box is erected so as to overlap the transmission shaft when viewed from the side, and the operating shaft of the pitman arm is arranged below the transmission shaft, overlapping the power steering box. The action and effect are as follows.

[Effect]

In other words, as mentioned above, the shape of the power steering box is L-shaped with the Pitman arm operation shaft protruding in a substantially horizontal direction, and since the power steering box is installed in this position, the power steering box can be placed in the space to the side of the transmission shaft. The Pitman arm operating shaft can be positioned in the space below the transmission shaft.

As mentioned above, since the power steering box can be placed, the amount of protrusion of the power steering box at the upper and lower ends is reduced compared to the conventional placement position, and this placement does not interfere with the transmission shaft. There is no need to modify the drive system or steering operation system.

Further, since the pitman arm is disposed between the left and right frames, the pitman arm or the connecting portion between the pitman arm and the drag link is protected by the left and right frames and is not easily damaged.

[Effect of idea]

Therefore, it is possible to form the step of the driving section flat with a relatively simple configuration in which the power steering box 12 is placed in the space near the transmission shaft, which was originally a dead space.
A steering operation structure has been provided that provides ample legroom for the driver, allows easy pedal operation, protects the pitman arm, drag link, etc., and allows smooth driving even on rough roads.

Additionally, since a power steering box is generally larger than a manual type steering box, a manual type steering box can also be installed using the power steering box arrangement structure as described above, making it highly versatile. .

〔Example〕

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

As shown in FIG. 2, an engine 3 and a clutch housing 4 are mounted on the front part of a traveling vehicle body on which a steering front wheel 1 and a driving rear wheel 2 are respectively mounted.
A transmission case 5 is mounted on the rear part, and a driving section A consisting of a steering handle 6, a seat 7, etc. is provided in the center of the vehicle body, forming an agricultural tractor.

As shown in FIGS. 1 to 3, the engine 3,
The clutch housing 4 and the transmission case 5 are connected to left and right frames 8 arranged parallel to the front and back direction of the vehicle body.
a, 8b, and the output from the engine 3 is transmitted to the transmission case 5 via the clutch housing 4 and the transmission shaft 9, and the transmission shaft 9 is installed at the left and right frames 8a, 8b.
It is above the middle of .

The steering handle 6 has steering operation shafts 10, 10 configured to transmit a rotational operation.
The rotation operating force is transmitted to the integral type power steering box 12 by the joints 11 and 11, and the driving force of the pitman arm 13 of this box 12 is transmitted to the drag link 14.
It is configured to operate the knuckle arm (not shown) of the front wheel 1 via the front wheel.

Further, this power steering box 12 has a shape in which an operating shaft 15 is arranged facing upward, and an operating shaft of the pitman arm 13, a so-called sect shaft 16, is arranged laterally at the bottom. 12 is located on the right side of the transmission shaft 9, and the sect shaft 16 is located below the transmission shaft 9. Fixed.

Incidentally, numeral 19 in the figure is a step of the operating section A.

[Another example]

In this embodiment, the power steering box 12 is used for steering operation, but instead of this, a manual type steering box 12a may be used as shown in FIG. 4.

[Brief explanation of drawings]

The drawings show an embodiment of the steering operation structure for an agricultural tractor according to the present invention. FIG. 1 is a vertical side view of the steering operation section, FIG. 2 is an overall side view of the tractor, and FIG. 3 is a power steering box mounting structure. FIG. 4 is a longitudinal rear view showing another embodiment. 3... Engine, 5... Mission case,
8, 8a, 8b...Frame, 9...Transmission shaft, 1
2...Power steering box, 13...Pittman arm, 16...Operation shaft.

Claims (1)

[Scope of utility model registration request] Steering of an agricultural tractor in which the engine 3 and the transmission case 5 are connected by left and right frames 8a and 8b, and the engine 3 and the transmission case 5 are interlocked and connected by a transmission shaft 9 located between the left and right frames 8a and 8b. A vertically elongated power steering box 12 which is an operating structure and has an operating shaft 15 extending upward from the inner surface of one frame 8.
The power steering box 12 is erected in the space between the transmission shaft 9 and one frame 8 so as to overlap the transmission shaft 9 in side view, and the pitman arm 13 In this steering operation structure for an agricultural tractor, the operation shaft 16 is arranged below the transmission shaft 9 in an overlapping manner.