JPH0323902Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an agricultural tractor in which an engine and a transmission case are connected by left and right frames, and the engine and the transmission case are connected in conjunction with a 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.

In other words, 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 the interference, the steps of the operating 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]

The feature of this invention is that on the inner side of one frame,
A steering box mounting base with an operating shaft extending upward is provided, and a pitman arm extending downward from the side of the steering box is rotatable about the horizontal axis and the connecting end of the drag link is attached to the other side. A power transmission shaft from the transmission case to the front wheel differential device is inserted into the space between the pitman arm and the mounting base, and a lower oil pan of the engine is disposed close to the inner surface of the frame. A recess is formed in the bottom of the front wheel, and the power transmission shaft for the front wheels is inserted into the recess.
And the effects are as follows.

[Effect]

In other words, since the mounting base is provided with a steering box that can be operated from above as described above, simply bringing the box close to the frame causes the box to shift to the side of the vehicle body, causing the box to interfere with the shaft interlocking connection. Also, the operation system connected to the operation shaft does not interfere with the shaft interlocking connection part.
Moreover, it can be provided at the bottom of the step.

Furthermore, since the position of the Pitman arm is determined as described above, even if the box is set at a relatively low level, the Pitman arm rotates around the horizontal axis and moves forward and backward even when the Pitman arm swings. Since the arm swings, there is no interference between the arm and the power transmission shaft extending in the front-rear direction, and since the drag link is close to the inner surface of the frame, even when the vehicle is traveling on uneven ground, it will not interfere with protrusions on the ground. contact with the link is unlikely to occur. Furthermore, since the power transmission shaft is inserted through the recess formed in the oil pan, the power transmission shaft does not need to be set at a low level.

[Effect of the invention] Therefore, although the steering operation system can be stored and arranged in a compact manner, the steering box is not exposed on the top surface of the step, and the top surface of the step can be made wider, and at the same time, the link can be prevented from being damaged. It is also possible to reduce damage caused by contact of the power transmission shaft with the ground.

〔Example〕

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

As shown in Figure 3, a pair of left and right frames 1
The engine 2 and the main clutch housing 3 are mounted in a connected state on the front parts of the frames 1 and 1b.
A transmission case 4 is connected to the rear of the transmission case 4, and the main clutch housing 3 and the transmission case 4 are connected through a transmission shaft 5 so that power can be transmitted. A power transmission shaft 8 and a differential device 9a for the front wheels 9 are connected to the drive shaft 6 protruding from the rear wheels 7, and are arranged forward from the front surface of the transmission case 4.
A travel drive system is constructed by connecting the two. A mounted 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 rotating shaft 12 directly connected to the steering wheel, and a universal joint 1 connected to the rotating shaft 12.
An intermediate shaft 14 connected via 3, this intermediate shaft 14
Furthermore, via the universal joint 15, the operating shaft 16a
is connected to an integral power steering box 16, and a pitman arm 1 that extends downward relative to a sector shaft 16b that projects laterally from the side of the box and is rotatable around the horizontal axis.
7, and a drag link 18 connected to the pitman arm 17, and this link 18 is connected to the front wheel 9.
It is interlocked with the tie rod (not shown).

Operation shaft 16a of the steering box 16
is configured to be rotatable about an axis directed in the vertical direction, and is attached to the mounting base 19 provided on the frame 1b on the right side of the vehicle body with bolts 20.
The level is set at a level below the step S of the operating section A. Further, the connecting end of the pitman arm 17 with the drag link 18 is located close to the inner surface of the left frame 1a.

The power transmission shaft 5 from the main clutch housing 3 is located above the sector shaft 16b, and the power transmission shaft 8 is connected to the pitman arm 17.
Further, a recessed portion 21a is formed in the bottom of the lower oil pan 21 of the engine 2 facing in the front-rear direction, and the recessed portion 21a is provided with the power source. A transmission shaft 8 is inserted therein.

Further, piping 22, 22 for supplying and discharging hydraulic oil to and from the box 16 is provided from the top of the steering box 16 toward above the transmission shaft 5.

[Another example]

In addition to the embodiments described above, the present invention can also be implemented with a manual type steering box.

[Brief explanation of the drawing]

The drawings show an embodiment of the agricultural tractor according to the present invention, in which Fig. 1 is a schematic rear view showing the arrangement of the steering box, Fig. 2 is a side view showing the steering operation system, and Fig. 3 is an overall side view of the tractor. It is a diagram. 1a, 1b...Frame, 2...Engine, 4
...Mission case, 8...Power transmission shaft, 9a
... Front wheel differential device, 16 ... Steering box, 16a ... Operation shaft, 17 ... Pitman arm, 19 ... Mounting base, 21 ... Lower oil pan,
21a...Recessed part of oil pan.

Claims (1)

[Scope of utility model registration request] This is an agricultural tractor in which an engine 2 and a transmission case 4 are connected by left and right frames 1a and 1b, and the engine 2 and the transmission case 4 are connected in a axially interlocking manner. A mounting base 19 of the steering box 16 with an operating shaft 16a extending thereon is provided protrudingly, and a pitman arm 17 extending downward from the side surface of the steering box 16 is rotatable around a horizontal axis and is connected to a drag link connecting end. is the other frame 1a
The power transmission shaft 8 from the transmission case 4 to the front wheel differential device 9a is inserted into the space between the pitman arm 17 and the mounting base 19, and the engine A recessed portion 21 is provided at the bottom of the lower oil pan 21 of No. 2.
This agricultural tractor has a recessed portion 21a in which the front wheel power transmission shaft 8 is inserted.