JPS59100057A - Steering device for tractor - Google Patents

Abstract

PURPOSE:To secure a space amply for a working device beneath a main frame, by setting up a pitman arm inside the main frame at both sides, while situating a drag link in position within the vertical width of the main frame. CONSTITUTION:A pitman arm 22 is projected its tip part outward to the left of a car body sideways through a hole 24 formed in each of main frames 2 at both sides and set up inside these main frames at both sides. A drag link 23 couples a knuckle arm 19 and the pitman arm 22 together in an interlocking manner. In addition, the drag link 23, in a side view, is situated within the vertical width of these main frames 2 whereby the pitman arm 22 and the drag link 23 are designed so as not to be projected upward or downward from these main frames 2.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a steering device for a nine-wheel drive vehicle in which a pair of left and right main frames are arranged side by side.

The entire configuration of such a steering device is conventional! c,
The pitman arm and the drag link that interlocks and connects the arm with the wheel operating knuckle arm located apart in the longitudinal direction of the vehicle body are provided so as to be located above the main frame when viewed from the side. In order to avoid the pitman arm and drag link from interfering with various devices such as the engine mounted on the main frame, we have removed the disadvantages of being restricted in mounting various devices such as the engine, and the safety of the pitman arm and drag ring. Therefore, there was an inconvenience in that it could not be moved sufficiently toward the inside of the vehicle body.

For this reason, the inventor considered a means to position the pitman arm and drag link below the main frame in side view, but in this case, although the above disadvantages and inconveniences could be solved, The mounting space for the working device mounted below becomes smaller. This caused new inconveniences and was difficult to put into practical use.

An object of the present invention is to rationally arrange the pitman arm and drag link with respect to the main frame so that the pitman arm and drag link can be moved sufficiently toward the inside of the vehicle body, while still maintaining the main frame. It is possible to mount various devices such as an engine on the main frame without any special restrictions, and the space for the working equipment below the main frame can be made sufficiently large.

A characteristic configuration of the present invention is that, in a steering device for a pitman tractor, a pitman arm, which is operated to swing back and forth with a vertical stiffness of 111 centimeters, is inserted through a hole formed in the main frame with its distal end extending toward the outside of the vehicle body. Mt in the state of protruding to
If installed in the left and right main frames, both VCs, 111
When viewed from the 11th side, there is a drag link 'ktM' that interlocks and connects the tip of the pitman arm described in Part 1 and the knuckle arm for operating the ψ wheel located apart from it in the longitudinal direction of the vehicle body.
It is located at a point located within the upper and lower mountains of the main frame written in II.

In other words, a type of pitman arm that swings back and forth around a vertical axis is used, and the pitman arm is placed in the space within the left and right main frames, and The drag link that interlocks and connects the tip of the pitman arm that protrudes through the main frame with the wheel operating knuckle arm is positioned within 1↑J of the top and bottom of the main frame when viewed from the 111th plane. Although it is possible to move the pitman arm and drag link sufficiently toward the inside of the vehicle body to improve safety, it also prevents the pitman arm and drag link from protruding above or below the main frame, and improves engine safety. It is possible to conveniently mount various devices such as the above on the main frame, and to provide a large space for mounting the working device below the main frame.

As a result, a steering device that can be used extremely conveniently in a frame type tractor has been obtained.

Embodiments of the present invention will be described below based on the drawings.

As shown in Figure 1, there is a pair of left and right sides that can be operated to change direction.
At the rear of a pair of left and right main frames (2) equipped with one ul wheel (10L) and thd', left and right rear wheels f:l'b),
In addition to connecting and supporting the differential case (3) of fi'&), the crankshaft +
41 ft Engine +51 f toward the front and back of the vehicle:
The mower drive power take-off shaft +6) is mounted on the lower abdomen of the front part of the vehicle body, and is driven and rotated by the IIT end of the crankshaft (4) via the transmission belt (7). At the same time, the hydraulic continuously variable transmission (8) for driving the vehicle, which is located at the rear of the vehicle body, is connected to the rear end of the crankshaft (4) via the transmission shaft (9) so as to be driven and rotated. In addition, a driver's seat (1 (71) is provided at the rear of the vehicle body, and a tractor for installing a mower is installed without PM.

And a rotary mower (
Ll-1 front and rear pair of vertical swing links (13), (1
(2) A transmission shaft α4 which can bend and extend and which transmits the power of the power extraction shaft (6) to the mower az of the power extraction shaft (6) is provided, and the mowers 11 and 11 etc.
It is configured so that it can perform one task.

An engine cooling radiator (151) is disposed at the rear of the engine (5), and a radiator fan marked 0, which is interlocked and connected to the rear end of the crank IFi II, blows cooling air from the rear of the vehicle toward the front. and the rear wall part (1'7) of the cover aη that covers the engine mounting part 2.
a) 'lr, formed into a net shape for introducing cooling air.

Next, the steering device for changing the direction of the left and right front wheels +11 and [11'i will be explained based on FIGS. 1 to 8.

In other words, the left and right m1 wheels (f1) and fil are rotated together by a tie rod (formerly, they are interlocked and connected, and the knuckle arm (191 and steering hand/V (a) attached to the left front wheel (1) is vertically nII around axis (2j)
The Pi I/Man arm [no], which will be swung later, is connected in conjunction with the drag link (23) to connect the left and right front wheels (1) ii.
This allows for the lTh direction change operation.

Then, the tip of the pitman arm (vif) is completely connected to the hole formed in the left main frame (2).
The drag link (to) is disposed in the left and right main frames f2+, +21 in a state of protruding outward to the left side of the vehicle body, and when viewed from the side, the main frame (2)
), so as not to protrude above or below the pitman arm, drag link (23), or main frame (2).

Further, the drag link may be inserted into the main frame (2) in at least a part of the front wheel direction change range, for example, main claim +21'k,
It has a U-shaped cross section and is installed with its opening facing toward the outside of the vehicle body structure, thereby positioning the drag link (C) toward the inside of the vehicle body.

Said Pitman arm @ For full operation...■ Vertical axis 4)
are supported by the stays (S3a) and (2a) attached to the left and right main frames + 2) and plate-shaped bodies connected by bolts, and the fan-shaped gear integrally formed on the pitman arm @. Occlusion on (22a).

The gear cs'6 is rotatably attached to the steering shaft (2) supported on the mI plate-like body (25).

In carrying out the entire invention, the structure for supporting the Pitman arm and the structure for operating it can be modified in various ways.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the steering device for a tractor according to the present invention, and FIG. 1 is a partially cutaway side view of the tractor, and FIG.
The figure is a schematic plan view of the steering device, and FIG. 8 is a cutaway side view showing the mounting portion of the pitman arm. (2)... Mainframe, 09...
Knuckle arm, (2D... vertical axis, ■...
...Pitman arm is in trouble...Drag link. Voluntary procedure amendment 7. 1. Indication of the incident 1982 Special Application No. 209878 2
, Name of the invention: Tractor steering device 3, Relationship with the case of the person making the amendment Patent Applicant address: 2, Shikitsu Higashi/Chome, Naniwa-ku, Osaka-shi, Osaka Prefecture Name (105) Kubota Tekko Co., Ltd. 4, Agent ■531 The scope of patent claims will be corrected as shown in the attached sheet. Document stating the scope of claims after amendment to the list of attached documents 1ii 1 claim ■ A steering device for a tractor in which a pair of left and right 7 main frames 12+ and +21 are arranged side by side,
The pitman arm, which is operated to swing back and forth around the vertical axis (21), has its tip attached to the main frame fil K.
It is arranged in the left and right main frames +21, 121 in such a manner that it projects outwardly through the formed hole (material), and is located away from the tip of the pitman arm in the longitudinal direction of the vehicle body when viewed from the side. A steering device for a high-speed vehicle, characterized in that drag links for interlocking and connecting knuckle arms for wheel operation are located in the middle of the upper and lower sides of the main frame (2) of IIJ. The main frame (2) has a U-shaped cross section so that the drag link (noted in 33lfl) is inserted into the main frame (2j) in at least a part of the wheel direction change range. The steering device for a tractor according to claim 0, wherein each of the tractor steering devices is formed in a shape J''' ([[straightened]) with its opening facing toward the outside of the vehicle body structure.

Claims (1)

[Claims] ■ A steering device for a tractor in which a pair of left and right main frames +21, (21') are arranged in parallel,
The pitman arm @wo, which is operated to swing back and forth around the vertical axis (2), is attached to the left and right main frame +21 with its tip end... , +21 (on the side surface I, the drag link (c) wo interlockingly connects the tip of the pitman arm (■) and the wheel operating knuckle arm α9 located apart from it in the longitudinal direction of the vehicle body); A steering device for a tractor, characterized in that the main frame (2) is located above and below the main frame (2).
2) Insert the main frame f2)
2. A tractor steering device according to claim 1, wherein the steering device has a U-shaped cross section and is installed with its opening facing outward from the vehicle body structure.