JPH0714115Y2 - Steering device for mobile agricultural machines such as agricultural tractors - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a steering device for a mobile agricultural machine such as an agricultural tractor, and in particular, a full hydraulic power steering mechanism is provided below a fuel tank disposed in front of a steering mast. The present invention relates to a steering device in which a power steering unit including the hydraulic switching valve is located.

[Conventional technology]

Conventionally, steering devices for mobile agricultural machines such as agricultural tractors are
When changing the direction of the aircraft at low speeds, it is necessary to reduce the burden on the driver when steering, so the hydraulic switching valve built into the power steering unit is linked to the rotation of the steering wheel, It has been proposed to employ an all-hydraulic power steering mechanism for adjusting the. However, in order to concentrate the mass in consideration of the front-rear weight balance of the aircraft, in order to concentrate the mass, a fuel tank front-mounted agricultural tractor with a fuel tank in front of the driver seat near the engine placed in the approximate center of the aircraft, etc. Then, in order to secure the habitability of the driver's seat, there is a situation that the mounting space of the steering device has to be narrowed. Therefore, the lower end of the steering shaft that pivotally supports the steering wheel is rotated via a universal joint. It has been proposed to connect to a power steering unit mounted in front of the front axle. However, in such a configuration, since the rotation of the steering wheel is transmitted to the power steering unit, the vehicle body configuration must be made in consideration of the transmission path of the connecting portion, and the cost increase due to the increase in the number of component parts. And the like.

[Problems to be solved by the present invention]

The present invention has been made in view of the above circumstances to solve the drawbacks of the related art, and its purpose is to:
An all-hydraulic power steering mechanism is used for the steering device of mobile agricultural machinery such as agricultural tractors, and a fuel tank is installed in front of the Stelling mast to centralize the mass and a bracket that supports the fuel tank from below. By fixing the plate to the vehicle and positioning the power steering unit attached to the plate below the fuel tank, the power steering unit can be compactly stored in the narrow space in front of the driver's seat, and the comfort of the driver's back is improved. It is intended to provide a steering device for a mobile agricultural machine such as an agricultural tractor.

[Means for Solving the Problems]

In order to solve the above problems, the technical means adopted by the present invention is to arrange a fuel tank in front of the steering mast,
A plate that supports the fuel tank from the rear is fixed to the steering mast side of the bracket that supports the fuel tank, and the plate is extended in the shape of a gate having a mounting inclined surface that is inclined downward toward the rear, and the above-mentioned mounting is performed. A steering mast is mounted on the upper surface of the inclined surface, and a power steering unit with a built-in hydraulic switching valve is mounted on the lower surface side of the mounting inclined surface to attach the power steering unit connected to the steering mast to the fuel tank. It is characterized in that it is located below.

〔Example〕

The embodiment of the present invention shown in the drawings will be described in detail.

1 to 3, reference numeral 1 denotes a machine body of an agricultural tractor, which is a machine body frame 4 which pivotally supports a front wheel 2 and a rear wheel 3.
An engine 5 is mounted on the front portion of the engine 5, and a hydraulic pump 10 'that is interlockingly connected to a steering device 10 described later is fixedly installed on the front surface of the engine 5. A fuel tank 6 is provided behind the engine 5, a driver's seat 7 is provided above the rear wheel 3, and an operation pedal group 8 is provided above the driver's seat 7 at a lower front position. A protruding step 9 is provided.

Above the step 9, a steering device 10 is fixedly provided near the rear of the fuel tank 6, and a power steering unit 13 described later is provided at a lower end of a steering mast 12 which pivotally supports a steering wheel 11. It is arranged on the lower rear side of the vehicle as desired. That is, the lower portion of the fuel tank 6 is supported by the bracket 15 via the cushioning material 14, and the plate 16 is fixed to the bracket 15 on the steering mast 12 side. Corresponding to the installation, it extends in a gate shape having a mounting inclined surface 16a that is inclined rearward and downward. The steering mast 12 is mounted on the upper surface of the mounting inclined surface 16a, and the lower end portion of the steering mast 12 penetrates the mounting inclined surface 16a. On the other hand, on the lower surface side of the mounting inclined surface 16a, in the gate-shaped space, there is a power steering unit.
A power steering unit 13, which is attached to the steering mast 12 and is linearly connected to the steering mast 12, is located below the rear portion of the fuel tank 6. The front edge portion 16c of the plate 16 supports the lower rear portion of the fuel tank via a cushioning member 17.

The steering wheel 11 is rotatably supported by an upper end of a steering shaft 18 that is rotatably supported in a steering mast 12 that is installed obliquely toward the driver's seat 7, and that the lower end of the steering shaft 18 is rotatably supported by the steering shaft 18. In the case 19, the power steering unit 13 having a hydraulic switching rotary valve (not shown) is connected. The hydraulic pressure switching rotary valve switches the hydraulic pressure control path in conjunction with the rotation of the steering shaft 18, and moves from the hydraulic pressure outlets 20,20 formed on one side surface of the case 19 to the hydraulic pipes 20 ', 20' ... Is for controlling the amount and direction of pressure oil delivery, and the hydraulic outlet is provided on the hydraulic pump 10 'side fixed to the front surface of the engine 5 and connected to the hydraulic pipes 20', 20 '. .

Behind the steering device 10, above the step 9, a panel rear cover 21 is provided alongside the steering mast 12 and the power steering unit 13 in an inclined manner. 22 is a fender and 23 is a mission case.

Therefore, according to the present invention, the fuel tank 6 is placed substantially in the center of the machine body to centralize the mass, improve the front-rear weight balance of the machine body, and maintain stable traveling while performing work. However, since the power steering unit 13 is located particularly close to the lower rear of the fuel tank 6, the power steering unit 13 can be compactly stored in the narrow space in front of the driver's seat 7. 23, fuel tank 6 and steering mast
The panel rear cover 21 that covers 12 can be formed as close to the front as possible, that is, close to the steering device 10 side, and the space for the step 9 formed between the fender 22 and the driver seat 7 can be increased. A living space can be secured. Further, when the hydraulic outlets 20 and 20 are provided on the hydraulic pump 10 'side and connected to the hydraulic pipes 20' and 20 'as in the embodiment, the configuration is simplified and the attachment and detachment are facilitated. Therefore, maintainability can be further improved.

Further, a bracket 15 that supports the lower portion of the fuel tank 6,
Similarly, at the front edge portion 16c of the plate 16 that supports the lower rear portion of the fuel tank 6, the buffer tanks 14 and 17 are interposed to support the fuel tank 6, so that even in a field with many irregularities, Vibrations such as kickback to the steering device 10 due to the swing of No. 1 are prevented from being transmitted to the fuel tank 6, and there is no fear of fuel leakage.

[Effect of device]

In short, according to the present invention, the fuel tank is arranged in front of the steering mast, and the plate supporting the fuel tank from the rear side is fixed to the steering mast side of the bracket supporting the fuel tank. A power steering that extends in the shape of a gate having a mounting inclined surface that is inclined toward the front side, and a steering mast is mounted on the upper surface of the mounting inclined surface, and a hydraulic switching rotary valve is built in on the lower surface side of the mounting inclined surface. Since the unit is attached and the power steering unit connected to the steering mast is located below the fuel tank, the fuel tank arranged in front of the steering mast can improve the weight balance between the front and rear of the fuselage and the fuel. The plate attached to the bracket that supports the fuel tank Since support, the vibration of the fuel tank can be further reduced. Since the plate extends in the shape of a gate having a mounting slope, the steering mast and the power steering unit can be easily positioned and fixed only by mounting the steering mast and the power steering unit on the mounting slope from above and below. Moreover, since the power steering unit mounted on the lower surface side of the mounting inclined surface is located below the fuel tank, the power steering unit connected to the steering mast can be compactly stored in the narrow space in front of the driver's seat. The living space can be made as wide as possible and has extremely useful practical effects.

[Brief description of drawings]

FIG. 1 shows an embodiment of a steering device for a mobile agricultural machine such as an agricultural tractor according to the present invention. FIG. 1 is an overall side view of the agricultural tractor, FIG. 2 is an enlarged side view of essential parts, and FIG. It is a rear view. In the figure, 6 ... Fuel tank, 12 ... Steering mast, 13 ...
Power steering unit, 15 ... Bracket, 16 ...
… It ’s a plate.

Claims (1)

[Scope of utility model registration request] 1. A fuel tank is arranged in front of a steering mast, and a plate for supporting the fuel tank from the rear is fixed to a steering mast side of a bracket supporting the fuel tank, and the plate is directed rearward and downward. And a steering mast is mounted on the upper surface of the mounting inclined surface, and a power steering unit with a built-in hydraulic switching valve is installed on the lower surface side of the mounting inclined surface. A steering device for a mobile agricultural machine such as an agricultural tractor, wherein the power steering unit mounted and connected to a steering mast is located below a fuel tank.