Bending construction vehicle

Abstract

A bending construction vehicle suitable for traveling on a normal roadway and steered in a manner suitable also for work in a construction site. The bending construction vehicle has a bendable self-propelled vehicle body (1), a hydraulic cylinder (2) for bending the self-propelled vehicle body, a pilot-operated direction changeover valve (5) for controlling the flow of pressurized oil to the hydraulic cylinder (2), an operation device (6) for a steering wheel, for outputting, when the steering wheel (7A) is operated, a pilot signal to a signal receiving section of a direction changeover valve (7) to change over the changeover valve (5), a control device (10) for an electric lever, for outputting an electric signal when tilting operation of a lever (11A) is performed, a controller (11) for allowing the electric signal from the operation device (10) to be inputted in it, signal conversion means for converting the electric signal into a pilot signal to output the pilot signal to a signal receiving section of the direction changeover valve (5), changing over the changeover valve (5), and selection means having an operation system for allowing rotation operation of the steering wheel (7A) and tilting operation of the operation lever (11A) to be selectively performed.

Description

technical field [0001] The present invention relates to a wheel loader having a bicycle body that is rotatably connected to a front frame and a rear frame in the horizontal direction, and a hydraulic cylinder for bending the bicycle body as a hydraulic actuator for bending the bicycle body Or curved construction vehicles like self-compacters. Background technique [0002] Among the self-propelled construction vehicles, there are special construction vehicles that are not regarded as ordinary construction vehicles, which turn by bending a bicycle body while going forward in a curve. In this specification, such a construction vehicle is called a bending type construction vehicle, and a bending type wheel loader is mentioned as a representative. In such a construction vehicle, a bicycle body is divided into a front frame supported by front wheels and a rear frame supported by rear wheels, and the two frames are rotatably connected in the horizontal direction so as to be bendab...

AI Technical Summary

Problems solved by technology

Therefore, in the curved construction vehicle using the steering device of this form, such large operations with a large amount of operation are frequently performed during work, which brings a large operational burden on the operator and becomes a source of fatigue for the operator. important reason

[0008] Second, the handwheel is the same as that of an ordinary car, and it is suitable for holding with both hands. However, when using a wheel loader for excavation work while driving, in addition to the hydraulic cylinder for body bending, It is also necessary to operate the hydraulic actuators associated with this job, so the hand wheel must be operated with one hand, which is difficult to operate

In addition, hydraulic actuators for work are usually operated by an operation unit such as a joystick, and are manually operated by an operation unit that operates differently from the handwheel. Therefore, when driving while performing work, one hand rotates the operation handwheel, It is difficult to operate an operation unit such as a joystick tilted by the other hand to operate differently from the hand wheel

From this point of view, it cannot be said that a curved construction vehicle with a handwheel steering device is suitable for on-site operations.

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