JPS633554Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to the steering operation part of a work vehicle. Through simple improvements, it is possible to supply lubricant oil to the swing arm that branches and interlocks the left and right steering wheels to the steering handle. The purpose is to make sure that you can do it without putting too much effort into it.

The characteristic configuration of the steering operation unit of a work vehicle according to the present invention is that the case of the differential device that drives the left and right steering wheels, the swinging arm that branches and interlocks both wheels to the steering device, and the support shaft that rotates integrally. is penetrated so that its longitudinally intermediate portion is located in the internal space of the case, and its effects are as follows.

In other words, by simply modifying the middle part of the support shaft that rotates integrally with the swing arm into the internal space of the case, the support shaft can also be lubricated by the lubricating oil of the differential gear. As a result, the work and structure for replenishing lubricating oil to the swing arm can be eliminated, and maintenance work can be saved and the lubrication structure can be simplified.

Next, an example of the present invention will be shown.

A case 3 housing a differential gear is attached to a pair of left and right main frames 1 via a connecting frame 2, and two transmission shaft cases 4 extend from the case 3.
A steering wheel 5 is attached to each steering wheel 5 via a gear box 6 so as to be able to swing freely around the vertical axis _P1 , and a swing arm 9 is linked by a tie rod 8 to the left and right knuckle arms 7 that swing together with the wheels 5. A support shaft 10 that rotates integrally with the swing arm 9 is attached to the case 3, and a double-acting hydraulic cylinder 12 operated by a steering handle is installed between the arm 13 extending from the support shaft 10 and the main frame 1. The hydraulic cylinder 12 is attached to the hydraulic cylinder 12 to form a steering operation section for steering the wheels 5 by expanding and contracting the hydraulic cylinder 12.

As shown in FIG. 2, the longitudinal intermediate portion of the support shaft 10 is located in the internal space of the case 3,
The lubricating oil in the case 3 is made to penetrate into the shaft portion of the support shaft 10.

The case 3 is attached to the connecting frame 2 so as to be able to swing freely around the axis P ₂ in the longitudinal direction of the vehicle body. The connecting pin 14 is lubricated by being flipped up by a differential gear that is driven and rotated via the connecting pin 14.

Note that the swing arm 9 can be driven in various ways, such as being driven directly by the rotational force of a steering handle, and these configurations are collectively referred to as a steering device 12.

The present invention is applicable to various work vehicles such as agricultural work vehicles such as lawn mowers and tractors, and transport vehicles.

[Brief explanation of the drawing]

The drawings show an embodiment of the steering operation section for a working vehicle according to the present invention, and FIG. 1 is a partially cutaway plan view of the main part, and FIG. 2 is a longitudinal sectional view. 3... Case, 5... Wheel, 9... Swinging arm, 10... Support shaft, 12... Steering device.

Claims (1)

[Scope of utility model registration request] A support shaft 1 that rotates integrally with a swing arm 9 that branches and interlocks both wheels 5, 5 to a steering device 12 is attached to a case 3 of a differential device that drives left and right steering wheels 5, 5.
2. A steering operation section for a working vehicle, characterized in that the steering operation section for a working vehicle is made to pass through the casing 3 so that its longitudinally intermediate portion is located in the internal space of the case 3.