JPH085895Y2 - Work vehicle steering operation structure - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a steering operation part structure used in a work vehicle such as an agricultural tractor or an agricultural lawn mower.

[Conventional technology]

Conventionally, in order to prevent the vibration of the engine coupled to the vehicle body from being transmitted to the control section, means for vibration-isolating and supporting the driver's seat and steps with respect to the vehicle body has been taken, but the steering gear fixed to the vehicle body The steering wheel provided on the box was not particularly vibration-isolated.

[Problems to be solved by the device]

Therefore, the vibration transmitted to the operator through the driver's seat and steps is mitigated, but the vibration of the aircraft is directly transmitted to the hand holding the steering wheel, and the feeling of control is not always good. It was

In order to eliminate such a problem, it is conceivable that the handle shaft extending upward from the steering gear box is configured to be swingable via a joint, and the upper part of the handle shaft is supported against vibration with respect to the machine body. However, it is quite difficult to match the characteristics of the handle shaft anti-vibration means and the step anti-vibration means, and there is a risk that the overall anti-vibration effect will be impaired due to this characteristic mismatch. .

The present invention has been made in view of such an actual situation, and by improving the antivibration support structure of the handle shaft, the antivibration effect of the entire control section can be satisfactorily exhibited. The purpose is to

[Means for solving the problem]

In order to achieve the above-mentioned object, the characteristic structure of the present invention is to attach a steering gear box to a machine body to which an engine is connected, extend a handle shaft swingably upward from the steering gear box, and set a steering section standing in front of a driver's seat. The post and the step are integrated and elastically supported on the machine body, and the handle shaft is rotatably supported by supporting the lower part thereof by the second supporting member and the upper part thereof by the first supporting member, respectively. The second support member is supported by the steering gear box, and the first support member is supported by the control section post, and the action and effect are as follows.

[Action]

According to the above characteristic configuration, the first support member that supports the lower portion of the handle shaft is supported by the steering gear box directly connected to the engine, but the steering unit post that supports the upper portion of the handle shaft via the first support member. Is integrated with the step and elastically supported by the airframe. Therefore, the step and the steering wheel that are vibration-proof supported for the machine body on the vibration side are included in the same vibration system. Further, the relative positional relationship between the various operating tools and switches provided on the control section post and the steering wheel is unchanged.

[Effect of device]

As a result, it is possible to support the steering handle with the same vibration system as the step and to support the anti-vibration, and the anti-vibration effect of the entire control section is enhanced, so that the operability and the comfortability can be improved.

Moreover, since the relative positions of the various operation tools and switches with respect to the steering wheel are invariable, these operation feelings can always be made the same, which is also excellent in handling.

〔Example〕

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

FIG. 2 shows an agricultural tractor which is an example of a work vehicle to which the present invention is applied. This agricultural tractor is provided with a pair of left and right wheels (1) and (2) on the front and rear sides respectively, and a radiator (3) is provided at the rear of the inside of the hood at the front of the fuselage, and a front blowing type cooling is provided at the front. Fan (4)
The engine (5) provided with is arranged, and the main clutch housing (6), the front transmission case (7), the rectangular frame (8) and the rear mission case (9) are sequentially connected and fixed behind the engine (5). The rear wheel (2) is provided through the transmission shaft (11), which constitutes the airframe (10) and inserts the power of the engine (5) from the front transmission case (7) through the rectangular frame (8), and the rear transmission case (9). ), And is transmitted from the front transmission case (7) to the front wheels (1).

A steering handle (12) is provided above the front transmission case (7), and a control post (13) is provided upright in front of the steering handle (12), and rear left and right rear wheel fenders (14) are provided. , (14), the driver's seat (15) is elastically supported. Then, the steps (1
6) is integrated with the rear wheel fender (14).

Next, the support structure of the steering wheel (12) will be described.

As shown in FIG. 1, at the lower end of the handle shaft (22) to which the steering handle (12) is attached, the pitman arm (23) is inserted into a steering gear box (24) for interlocking movement, and in the middle thereof. The part is supported by an outer case (25) which is surrounded. The outer cylinder case (25) is vertically divided into two parts, and the upper cylinder case portion [an example of the first support member] (25a) is elastically supported to the machine body (10) through the elastic body (E). The lower cylinder case [an example of the second support member] (25b) is vertically fixed to the steering gear box (24) fixed to the machine body (10).

In detail, step (16), rear wheel fender (14),
And the control post (13) are fixed together,
It is attached to the machine body (10) at a plurality of places via elastic bodies (E) such as rubber to prevent the vibration of the engine (5) from being transmitted. Further, a partition wall (27) for forming the outer valve intake chamber (R) of the radiator (3) is integrally fixed to the control section post (13), and a pair of upper and lower parts is formed from the rear surface side of the partition wall (27). The support brackets (28a) and (28b) are fixedly extended.

The upper support bracket (28a) and the upper cylinder case (25
A bracket (29) fixedly extended from (a) is integrally bolt-connected, and the upper cylinder case portion (25a) is indirectly supported by the machine body (10) via the elastic body (E). On the other hand, the lower support bracket (28b) is connected to and supported by a bracket (30) fixedly extending from the lower cylindrical case portion (25b) via an elastic body (E). In addition, the bolt insertion hole of the bracket (29) is configured as a stupid hole, and the upper cylinder case (25
The position of the lower cylinder case (25b) of a) can be adjusted.

Then, attach the steering shaft (22) to the lower tube case (25
It is inserted so as to be displaceable in the radial direction with respect to b), is supported by the upper cylinder case part (25a) via a rubber bush (31), and is tiltable in the lower cylinder case part (25b). A joint mechanism (32) is provided. As a result, the steering shaft (22) is configured to be swingable with respect to the steering gear box (24) fixed to the machine body (10) and the lower case member (25b). Also, the lower cylinder case (25
An oil seal (33) with a lip is provided between the steering shaft (22) and the upper end of (b).

It should be noted that reference numerals are added to the claims of the utility model for convenience of comparison with the drawings, but the present invention is not limited to the structure of the accompanying drawings by the entry.

[Brief description of drawings]

The drawings show an embodiment of the steering operation portion structure of a work vehicle according to the present invention. FIG. 1 is an enlarged side view of a main portion, and FIG. 2 is a side view of an entire tractor. (5) …… Engine, (10) …… Airframe, (13) …… Control post, (15) …… Operating seat, (16) …… Step,
(22) Handle shaft, (24) ... Steering gear box, (25a) ... First support member, (25a) ... Second support member.

Claims (1)

[Scope of utility model registration request] A steering gear box (24) is attached to a machine body (10) to which an engine (5) is connected, and a handle shaft (22) is swingably extended upward from the steering gear box (24) for operation. The control unit post (13) standing upright in front of the seat (15) and the step (16) are integrated into one body (1
0), and the handle shaft (22) is rotatably supported by supporting the lower part of the handle shaft (22) with the second support member (25b) and the upper part thereof with the first support member (25a). In addition, the steering of the work vehicle in which the second support member (25b) is supported by the steering gear box (24) and the first support member (25a) is supported by the control section post (13). Operation part structure.