JPS5973305A - Expand/contract method for shaft of self-running working vehicle - Google Patents

Abstract

PURPOSE:To perform safe and smooth control of an axis, by constituting a vehicle such that, when the axle of a self-running working vehicle operative on an elevated spot is controlled, a boom axis coincides with the central line of a chassis, the center of gravity is alternately positined at the front and the rear of the chassis, and front and rear wheels are forced to alternately float away from a ground. CONSTITUTION:A swirl base stand 5 is swirled so that the axis of an expandable boom 6, contracted to its minimum size, coincides with the central line in a longitudinal direction of a chassis 1, and the center of gravity is positioned at the rear of the chassis 1. Thereafter, through expansion of a vertical cylinder 9 at the central part of the chassis, the front of the chassis 1 is raised to lift front wheels 2 and 2' away from a ground, and an inner box is protruded from an outer box through expansion of an expandable cylinder, not shown. Thereafter, the cylinder 9 is contracted, and the swirl base stand 5 is turned 180 deg.. This causes the center of gravity to be positioned at the front thereof, and by following the same control procedures, the inner boxes of rear wheels 3 and 3' are protruded therefrom. As noted above, control of the axis is effected through utilization of the position of the center of gravity, and this enables safe and smooth control of the axis.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for extending and contracting the axle of a self-propelled working vehicle such as a self-propelled aerial work vehicle or a self-propelled crane vehicle.

In self-propelled work vehicles that are subject to overturning moments during work, the axles are made extendable and retractable in order to ensure the stability of the vehicle body supported by the wheels and to facilitate transportation. There is. However, the conventional axle extension method presses the tip of the boom of the work vehicle against the ground surface, lifts the vehicle body, lifts the wheels off the ground surface, and extends and retracts the axle. Alternatively, if work is carried out despite the deformation, there is a risk of damage or other accidents, and if the strength of the boom is increased to withstand excessive force, the weight of the boom will increase. It was something.

The present invention has been made in view of the above circumstances, and
It is an object of the present invention to provide a method for extending and retracting the axle of a self-propelled working vehicle, which allows the axle to be extended and retracted safely and smoothly without applying excessive force to the boom or the like.

Embodiments of the present invention will be described below with reference to the drawings. Figures 1 and 2 show a self-propelled aerial work vehicle, which has a chassis (1
) is provided with a swing base (5) via a swing ring (4), one end of a telescoping boom (6) is pivotally supported on the swing base (5), and the telescoping boom (6) is built-in. Telescopic cylinder (
(not shown) and is undulated by a undulation cylinder (7). There is a workbench (8) at the tip of the telescopic boom (6).
is maintained in equilibrium, and when the telescopic boom (6) is in the retracted state, the center of gravity of the work vehicle is located on the side of the swing base (5) from the center of the vehicle platform (1).

The four wheels (2, 2', 3, 3') are mounted on the chassis (
Outer boxes (10, 11) provided before and after 1)
Inner boxes (12, 12') are telescopically fitted into the outer boxes (10, l 1 ).

13.13') and an axle inner box (12
, 12', 13.13'), and each inner box ('12.12', 13°13') has a built-in telescopic cylinder (14, 14'15.15').
), the outer box (10 degrees) is connected to a drive morph (not shown) at least one of the front and rear wheels of the axle.

A cylinder (9) is provided in the center of the chassis (1) so as to be able to expand and contract vertically downward, and as the cylinder (9) expands, the front or rear wheels of the wheels rise up.

A plate (16) is swingably attached to the tip of this cylinder (9).

When using a self-propelled aerial work vehicle with the above structure to extend the axle of the work vehicle from the contracted state, the telescopic boom (6
) is fully reduced and positioned in front of the chassis (1), and the pivot base (5) is rotated to a position where the axis of the telescopic boom (6) is parallel to the longitudinal center line of the chassis (1), and the center of gravity is The position is at the rear of the chassis (1), and as shown in Fig. 3, the cylinder (9) provided in the center of the chassis (1) is extended to raise the front of the chassis (1), and the front wheels (2, 2' , ) above the ground, and insert the inner box (12, 12') and outer box (10
) and extend the telescopic cylinder (14°14') to move the inner box (], 2, 1'2') to 7
'Put out from the outer box (10), and in this state insert the inner box (12, 12') into the outer box (10).
Fix the axle with a pin, etc. to keep the axle in an extended state. Next, after shrinking the cylinder (9), as shown in Fig.
) by 180 degrees and positioning the telescopic boom (6) to the rear, the center of gravity of the work vehicle is moved to the front of the chassis (1), and the cylinder (9) provided in the center of the chassis (1) is repositioned. Extend and raise the rear of the chassis (1), and raise the rear wheels (3°3
′) from the ground, and insert the inner box (13°13′)
) and the outer box (11), extend the telescopic cylinders (15, 15,') and remove the inner box (
13, 13') are extended from the outer box (11), and in this state, the inner box (13, 13') is fixed to the outer box (11) with a pin or the like to maintain the axle in an extended state.

When retracting the axle from the extended state, the center of gravity is moved by moving the rotating base (5) and the cylinder (9) provided in the center of the chassis (1) is moved in the same way as when extending the axle described above. By extension, the wheels (2゜2', 3, 3') are lifted off the ground in sequence, and the inner boxes (12, 12) are lifted off the ground.
', 13, 13') and outer box (10, 11
), and remove the telescopic cylinder (14, 14', 1
5.15') is contracted to sequentially contract the inner box into the outer box, and in this state, fix the inner hook to the outer box with a pin or the like to keep the axle in the contracted state.

As described above, according to the present invention, a self-propelled working vehicle with a simple structure can safely and smoothly extend and retract the front and rear axles without applying excessive force to the boom, etc. Thus, a method for extending and retracting the axle of a work vehicle is provided.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a top view of a self-propelled aerial work vehicle, FIG. 2 is a plan view of FIG. 1, and FIGS. It is an explanatory diagram. 1. Chassis, 2.2', 3.3', Wheels, 5. Swivel base, 9. Cylinder, ], ]0, 1]. Outer box, 12.12', 13.13'. Inner Box, 14, 14', 15, 15'... telescopic cylinder.

Claims (1)

[Claims] A work vehicle consisting of a vehicle chassis having front and rear telescopic axles with wheels at both ends, a rotating base mounted approximately in the center of the chassis, and a boom having one end pivoted to the rotating base so as to be able to rise and fall freely, When the swivel base is moved so that the longitudinal centerline of the chassis is parallel to the axial direction of the boom, a cylinder installed in the center of the chassis that expands and contracts vertically downwards can be extended, allowing one of the front and rear axles to move. The wheel is raised from the ground, this axle is extended and contracted, the turning base is rotated 180 degrees and the cylinder is extended again, thereby raising the wheel on the other axle from the ground, and this axle is extended and contracted. How to extend and retract the axle of a self-propelled work vehicle.