JPH032463Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention connects the engine and the transmission case to the front and rear of a pair of left and right frames, and connects the output shaft of the main clutch housing connected to the rear of the engine to the transmission case. The present invention relates to a steering operation structure for an agricultural tractor in which shaft transmission is performed with an input shaft.

[Conventional technology]

Conventionally, in agricultural tractors having the above configuration, for example,
As shown in Japanese Utility Model Publication No. 57-13375, the steering box is placed directly below the meter panel,
Some have a steering operation structure in which a drag link for steering the front wheels is placed on the side of the engine.

That is, if the steering box is installed below the driving section, it will easily interfere with the main clutch housing, transmission shaft, etc. if it is installed on the top surface of the step. While avoiding interference, the steps of the driving section were kept wide.

[Problem that the invention attempts to solve]

However, when a steering box is provided as in the past, the drag link has to be arranged so as to bypass the side of the engine, resulting in some inconveniences such as a complicated operation system.

An object of the present invention is to provide a steering box in a tractor having the above structure without the above-mentioned disadvantages.

[Means for solving problems]

A feature of the present invention is that a steering box with an operating shaft extending upward is disposed in a concave space formed by the large diameter portion and the rear small diameter portion of the main clutch housing. The small diameter portion and the steering box are constructed so as to overlap when viewed, and their functions and effects are as follows.

[Effect]

In other words, as described above, by placing the steering box in the recessed space, the steering box is actively brought closer to the main clutch housing, and the steering box with the operating shaft facing upward is adopted. Therefore, it is possible to place the steering box in a sunken state from the top surface of the step, or to place it entirely below the step, or it is also possible to place the steering box closer to the front.

[Effect of idea]

Therefore, by positively arranging the steering box in the conventional dead space, it has become possible to make the top surface of the step flat and wide without complicating the steering operation system.

〔Example〕

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

As shown in Fig. 6, a pair of left and right frames 1
The engine 2 and the main clutch housing 3 are mounted in a connected state at the front of a and 1b, and the transmission case 4 is connected to the rear, and the main clutch housing 3 and the transmission case 4 are interlocked via a transmission shaft 5. A power transmission shaft 5 is connected to the transmission shaft 5, which connects the drive shaft 6 protruding left and right from the rear of the transmission case 4 to the rear wheel 7, and is arranged forward from the front surface of the transmission case 4. Differential device 9 for front wheels 9
A is connected to form a travel drive system. A riding and driving section A consisting of a steering handle 10 and a seat 11 is provided in the center of the vehicle body, thereby configuring an agricultural tractor.

As shown in FIGS. 1 and 2, the operating system from the steering handle 10 includes a rotation shaft 12 directly connected to the steering wheel, and a rotation shaft 12 connected to the universal joint 1.
An intermediate shaft 14 connected via 3, this intermediate shaft 14
Furthermore, an integral type power steering box 16 is connected to the operating shaft 16a from above via a universal joint 15, a pitman arm 17 attached to a sector shaft 16b protruding toward the side of this box 16, and a pitman arm 17. The drag link 18 is connected to a tie rod (not shown) of the front wheel.

The operating shaft 16a of the steering box 16 is configured to be rotatable around an axis extending in the vertical direction, and the main clutch housing 3 has a large diameter portion at the front that houses a clutch plate, a pressure plate, etc. 3a and a rear small-diameter portion 3b that supports the output shaft 19 form an approximately concentric stepped outer shape, and the recessed space 3c formed by the large-diameter portion 3a and the small-diameter portion 3b has the above-mentioned The steering box 16 is inserted into the steering box 16, set at the lower level of the step S of the driving section A, and fixed with bolts 21 to the mounting base 20 provided on the frame 1b on the right side. .

The output shaft 19 is connected to the input shaft 22 of the transmission case 4 via the transmission shaft 5, and by setting the sector shaft 16b below the output shaft 19, it can be connected to the pitman arm 17. Avoiding interference.

As shown in FIG. 2, on both left and right sides of the steering handle 10, there are operating levers 23 for switching forward and backward movement of the vehicle body, and a handle accelerator lever 2.
4, and as shown in FIGS. 1 and 3, the operating system from the operating lever 23 is
3, an arm 28 attached to the lower part of the shaft 27, an arm 28 connected to the lower end of the shaft 27 via a universal joint 25, and a shaft 27 whose lower end is supported on the left frame 1a via a bracket 26; It consists of a bending rod 29 provided between the operating arm 4a on the left side of the case 4, and by operating and setting the operating lever 23 to the front and rear swing ends,
The operating arm 4a is similarly set to the F position and the R position in the figure.

The operating lever 23 is linked to a shift fork (not shown) that directly operates the gear system of the transmission case 4.

As shown in FIGS. 4 and 5, the operation system from the hand accelerator lever 24 is
is connected to the lower end of the unit via a universal joint 30, and
a shaft 32 whose lower part is supported by a bracket 31; a friction holding mechanism 33 provided between the shaft 32 and the bracket 31; a swing shaft 34 supported rotatably around the left and right axes with respect to the bracket 31; An L-shaped swing arm 36 is provided at the left end of the swing shaft 34 and its lower end abuts from the front against a rod 35 provided at the lower end of the shaft 32, and an arm 37 is provided at the right end of the swing shaft 34. , this arm 37 and the speed regulating arm 3 of the governor 38 provided on the right side of the engine 2.
It consists of a push-pull rod 39 provided between the
When the hand accelerator lever 24 is operated to swing, the arm 37 connected via the swing shaft 34 swings due to a change in the contact position between the rod 35 and the swing arm 36, and the regulating arm 38a is operated. At the same time, this operating position is held by the friction holding mechanism 33.

The friction holding mechanism 33 includes two friction plates 33a, 33a fitted externally to the lower end of the shaft 32, a disc spring 33b provided between these friction plates 33a, 33a,
33b, and nuts 33c, 33c screwed onto the shaft 32 to set the friction pressure.

Further, an accelerator pedal 40 is provided at the step S of the driving section A, and is linked to the operating system so that the vehicle speed can be adjusted by pressing the pedal 40.

In other words, the arm portion 40 of the accelerator pedal 40
a is swingably supported on the brackets 41, 41 attached to the lower surface of the step S with a left and right axis, and at the end of this arm portion 40a,
Attach the arm 42 facing forward, and
A rod 43 is provided between the swing end of the swing arm 2 and the upper end of the swing arm 36 to form a linkage. Then, when the accelerator pedal 40 is depressed while the vehicle is running, the speed regulating arm 38a of the governor 38 is operated in the speed increasing direction.

Incidentally, during this speed increasing operation, the contact between the swing arm 36 and the rod 35 is released, so that the holding position of the hand accelerator lever 24 is not changed.

[Another example]

In the present invention, the steering box may be of a manual type in addition to the above embodiments.

[Brief explanation of the drawing]

The drawings show an embodiment of the steering operation structure for an agricultural tractor according to the present invention, FIG. 1 is a schematic plan view showing the arrangement of the steering box, FIG. 2 is a left side view showing the steering operation system, and FIG. 3 is a schematic plan view showing the arrangement of the steering box. 4 is a right side view showing the accelerator operating system, FIG. 5 is a rear view showing the accelerator operating system, and FIG. 6 is an overall side view of the agricultural tractor. 1...Frame, 2...Engine, 3...Main clutch housing, 3a...Front large diameter part, 3b
... Rear small diameter portion, 3c ... Recessed space, 4 ... Mission case, 16 ... Steering box, 16a ... Operation shaft, 19 ... Output shaft.

Claims (1)

[Claims for Utility Model Registration] An engine 2 and a transmission case 4 are connected to the front and rear of a pair of left and right frames 1, and the output shaft 19 of the main clutch housing 3 and the input shaft of the transmission case 4 are directly connected to the rear surface of the engine 2. In this steering operation structure for an agricultural tractor, the steering shaft 16a is inserted upward into the recessed space 3c formed by the front large-diameter portion 3a and the rear small-diameter portion 3b of the main clutch housing 3. The steering box 16 extending toward the
A steering operation structure for an agricultural tractor in which a steering box 16 and a steering box 16 overlap each other. A steering operation structure for an agricultural tractor according to claim 1, wherein the steering box 16 is an Integra type power steering box.