JP2008062661A - Wheel type working vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wheel type working vehicle superior in a narrow place intrusion property and capable of intruding to a road a narrower right angle intrusion road width than conventional without contacting a wheel base and contracting a tread. <P>SOLUTION: The wheel type working vehicle 1 is provided with a wheel traveling type lower traveling body 2 having four-wheel steering function and is provided with an upper rotation body mounted on the lower traveling body 2 rotatably around a vertical axis and hoistably supporting an expansion/contraction boom attached with a working attachment. A constriction part 7 with smaller width than width in a vehicle with direction at front and rear sides of the lower traveling body 2 is formed between predetermined parts of a central part of the wheel base L<SB>WB</SB>of the lower traveling body 2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an improvement in a wheel-type work vehicle, and more particularly to a wheel-type work vehicle excellent in narrow space penetration.

  As is well known, in the case of a wheeled work vehicle such as a wheel crane, a four-wheel steering function is generally provided in order to improve narrow space entry. In particular, the right-angle approach road width represents the narrow space approachability of a wheeled work vehicle. Conventionally, in order to narrow the right-angle approach road width, the wheel base of the wheeled work vehicle has been reduced or the tread has been reduced. However, this deteriorates the running stability of the vehicle body. For example, when the wheel base is reduced, pitching occurs during traveling, and when the tread is reduced, the falling angle of the wheel-type work vehicle becomes severe, making design difficult. Therefore, by reducing the size and mounting structure of the outriggers provided on the front and rear of the vehicle body without reducing the wheelbase or tread, the narrow workability of the wheeled work vehicle is improved. I am doing so.

In the following, two conventional examples of typical wheeled work vehicles with improved narrow space penetration will be introduced. First, the wheel-type work vehicle (wheel crane) according to Conventional Example 1 is configured as shown in FIG. 7 in a schematic plan view in order to improve narrow space penetration. That is, the reduced length l _{2 of} the front outrigger 56 and the rear outrigger 57 is smaller than the vehicle width W of the vehicle body 51 of the wheeled work vehicle, and the maximum rotation of the vehicle when the vehicle is rotated with the minimum rotation radius R ₂ of the vehicle body 51. The dimensions are set such that the outermost ends of the front outrigger 56 and the rear outrigger 57 are positioned on a curve K drawn by the outer end.

Therefore, according to the wheel type working vehicle according to the conventional example 1, the minimum turning radius of the outrigger edge becomes the same as the minimum rotation radius R ₂ of the vehicle body 51, the minimum turning radius R ₂ is the entire wheel type working vehicle of the vehicle body 1 Therefore, the place where the vehicle body 1 can be bent is that the entire wheel type work vehicle can be bent. That is, the front-side outrigger 56 and the rear-side outrigger 57 do not interfere with the bending travel, and the small turnability of the vehicle body 51 is utilized in the wheel type work vehicle (for example, see Patent Document 1).

Moreover, the wheel type work vehicle according to Conventional Example 2 is configured as described later in order to improve narrow space penetration. That is, in a work vehicle in which front and rear outriggers are mounted on a vehicle body, the front and rear outriggers are mounted at a position within the minimum turning radius range of the vehicle body. In this conventional example 2, the outrigger is rotated along the side surface of the lower traveling body so that the outrigger is positioned within the minimum turning radius range of the vehicle body when the vehicle is traveling. The thing is also disclosed (for example, refer patent document 2).
Japanese Utility Model Publication No. 63-25672 Japanese Utility Model Publication No. 55-147554

  Since the wheel type work vehicles according to the above-described conventional examples 1 and 2 are all effective in improving narrow space penetration, they have already been implemented. However, in the case of an actual road, the road is wide but not cut off, or a large stone is placed at a corner, etc. In the configuration provided with the lower traveling body having the same vehicle width over almost the entire length, it interferes with the lower traveling body on the stone placed at the corner, so that further improvement in narrow space penetration cannot be expected.

  However, in recent years, wheel work vehicles have come to be used in various construction works in urban areas and residential areas in order to reduce labor costs and shorten the construction period. For this reason, there is an increasing demand for the realization of a wheeled work vehicle that can enter even a road with a narrower road width and has a certain work capacity.

  Accordingly, an object of the present invention is to provide a narrow space entry property that can enter a road having a narrower right-angle approach road width than before without reducing the wheel base or the tread (vehicle width). It is to provide an excellent wheeled work vehicle.

  The present invention has been made in view of the above circumstances. Therefore, in order to solve the above problems, the gist of the means adopted by the wheeled work vehicle according to claim 1 of the present invention is four-wheel steering. A wheel traveling type lower traveling body having a function is provided, and an upper revolving body that is mounted on the lower traveling body so as to be pivotable about a vertical axis and that supports a telescopic boom to which a work attachment is attached is supported up and down. In the wheel type work vehicle provided, a narrow portion that is smaller than a width in the vehicle width direction before and after the lower traveling body is formed between predetermined portions of a center portion of the wheel base of the lower traveling body. To do.

  The gist of the means adopted by the wheeled work vehicle according to claim 2 of the present invention is that, in the wheeled work vehicle according to claim 1, the lower traveling body is arranged on the cab side of the constricted portion of the lower traveling body. A lifting ladder including a locking portion that is detachably engaged with the provided engaging portion is provided.

  In the wheel type work vehicle according to claim 1 of the present invention, the width of the lower traveling body is smaller than the width of the lower traveling body in the vehicle width direction between a predetermined portion of the wheel base of the wheel traveling lower traveling body of the wheel working vehicle. Since the constricted portion is formed, the constricted portion can avoid stone setting even if a large stone is placed at the corner of the road. Therefore, according to the wheeled work vehicle of the first aspect of the present invention, it is possible to enter a road having a narrow right-angle approach road width as compared with the wheeled work vehicles according to the first and second conventional examples. Wheel work vehicles can be used for many construction works, which can greatly contribute to the reduction of labor costs and construction period in construction work.

  In the wheel type work vehicle according to the second aspect of the present invention, the cab side of the constricted portion of the lower traveling body is provided with a locking portion that is detachably engaged with an engaging portion provided on the lower traveling body. A lifting ladder is provided. Therefore, according to the wheeled work vehicle of the second aspect of the present invention, the operator can easily get into the cab using the elevating ladder and can go down from the cab to the ground. When the wheeled work vehicle is traveling, the lifting ladder is removed, so that there is no problem in entering a road having a narrow right-angle approach road width.

  Hereinafter, wheeled work vehicles according to Embodiments 1 to 3 of the present invention will be described with reference to the attached drawings. First, a wheel work vehicle according to Embodiment 1 of the present invention will be described with reference to the accompanying drawings. 1 is a schematic plan view showing a turning state of a wheeled work vehicle according to Embodiment 1 of the present invention, FIG. 2 is a perspective view of a lifting ladder, and FIG. 3 is a line AA in FIG. It is sectional drawing. FIG. 4 is a schematic plan view of a wheeled work vehicle according to a conventional example showing a turning state.

  Reference numeral 2 shown in FIG. 1 is a lower traveling body configured to be described later of the wheel traveling type of the wheeled work vehicle 1 according to the first embodiment of the present invention. The lower traveling body 2 is configured to be able to travel by four-wheel steering of two front wheels 3 and 3 and two rear wheels 4 and 4. A front outrigger 5 is attached to the front end of the lower traveling body 2, and a rear outrigger 6 is attached to the rear end. An upper swing body (not shown) is mounted on the lower traveling body 2 so as to be swingable about a vertical axis, and a telescopic boom (not shown) to which a work attachment is attached is freely raised and lowered. It is supported by.

Wherein between a predetermined central portion of the wheel base L _WB of the lower traveling body 2, this becomes narrow than the width of the front and rear vehicle width W _C of the undercarriage 2, constricted portion 7 to be described later is formed. The constricted portion 7 includes recesses 7a formed on both side surfaces of the lower traveling body 2 in the vehicle width direction, and these recesses 7a and 7a have a curvature of r in the center direction of the vehicle width of the lower traveling body 2. Curved with a radius.

An elevating ladder 9 having a configuration which will be described later is detachably attached to the concavity 7 of the lower traveling body 2 on the side of the recess 7a (not shown) on the left side facing the front in the forward direction. .
As shown in FIGS. 2 and 3, the elevating ladder 9 is removably fitted into an engaging portion 8 formed of a groove-like engaging hole provided in the upper portion near the outer edge of the lower traveling body 2. A pair of hook-shaped locking portions 9a, 9a are provided. That is, when the elevating ladder 9 is inserted into the engaging portion 8 and the pair of locking portions 9a, 9a are inserted, the end surfaces of the side plates 9b, 9c in the width direction of the elevating ladder 9 are recessed 7a. It is configured so that the attached state is maintained and the operator can move up and down.

The operation mode of the wheeled work vehicle 1 according to the first embodiment of the present invention will be described. That is, in the wheel type working vehicle 1 according to the first embodiment, between a predetermined central portion of the wheel base L _WB of the lower traveling body 2, slightly greater than the width of the front and rear vehicle width W _C of the undercarriage 2 Since the constricted portion 7 is formed, the constricted portion 7 can avoid the stone S even if a large stone S is placed at the corner of the road.

Therefore, according to the wheel type work vehicle 1 according to the first embodiment, as well understood in the comparison between FIG. 1 and FIG. 4 showing the turning state of the wheel type work vehicle, the wheel type work vehicle according to the conventional example. It is possible to enter a road having a narrow right-angle approach road width L _W1 (L _W1 <right-angle approach road width L _W2 shown in FIG. 4) that is narrower than that of the vehicle. For example, it is possible to obtain a narrow space penetration equivalent to that of at least one class lower wheel work vehicle, and it is possible to introduce wheel work vehicles for more construction work than before, so that construction work Can greatly reduce labor costs and shorten the construction period.

  Further, in the wheeled work vehicle 1 according to the first embodiment, a locking portion that is detachably engaged with the engaging portion 8 of the lower traveling body 2 on the cab side of the constricted portion 7 of the lower traveling body 2. An elevating ladder 9 having 9a is provided. Therefore, according to the wheel type work vehicle 1 according to the first embodiment, the operator can easily get into the cab using the lifting ladder 9 and can go down from the cab to the ground. And by removing the raising / lowering ladder 9 at the time of the driving | running | working of the wheel type work vehicle 1, it does not interfere with the approach to the road which has a narrow right angle approach road width.

A wheeled work vehicle according to a second embodiment of the present invention will be described with reference to FIG. 5 which is a schematic plan view showing the lifting ladder omitted. That is, between a predetermined central portion of the wheel base L _WB of the lower traveling body 2 of a wheel type working vehicle 1 according to the second embodiment, and narrow than the width of the vehicle width W _C of the front and rear of the lower traveling body 2 That is, a constricted portion 7 to be described later is formed. The constricted portion 7 is composed of recesses 7a having a rectangular shape in plan view formed on both side surfaces of the lower traveling body 2 in the vehicle width direction, and these recesses 7a and 7a are in the center direction of the vehicle width of the lower traveling body 2. In addition, it is recessed at a predetermined depth, and the vehicle width W of the constricted portion 7 is set to the same width across the front and rear.

  Therefore, according to the wheeled work vehicle 1 according to the second embodiment of the present invention, it is possible to avoid the stone setting by the constricted portion 7 even if a large stone is placed at a corner or the like of the road. The wheeled work vehicle according to the second embodiment can obtain the same effects as the wheel work vehicle according to the first embodiment.

A wheeled work vehicle according to a third embodiment of the present invention will be described with reference to FIG. 6 which is a schematic plan view in which a lifting ladder is omitted. That is, the predetermined distance of the central portion of the lower traveling body 2 of a wheel type working vehicle 1 according to the third embodiment wheelbase L _WB, marginally greater than the width of the vehicle width W _C of the front and rear of the lower traveling body 2 That is, a constricted portion 7 to be described later is formed. The constricted portion 7 includes recesses 7a having isosceles triangles formed on both side surfaces of the lower traveling body 2 in the vehicle width direction, and these recesses 7a and 7a are formed with the vehicle width of the lower traveling body 2. It is depressed at a predetermined depth in the central direction, and the vehicle width W of the constricted portion 7 is set to be the same across the front and rear.

  Therefore, according to the wheeled work vehicle 1 according to the third embodiment of the present invention, it is possible to avoid the stone setting by the constricted portion 7 even if a large stone is placed at the corner of the road. The wheeled work vehicle according to the second embodiment can obtain the same effects as the wheel work vehicle according to the first embodiment. In the case of the recess 7a of the wheeled work vehicle 1 according to the third embodiment, R may be formed at the apex angle of the isosceles triangle.

It is a typical top view which shows the turning state of the wheel type work vehicle which concerns on Embodiment 1 of this invention. 1 is a perspective view of a lifting ladder according to Embodiment 1 of the present invention. It is the sectional view on the AA line of FIG. It is a typical top view of the wheel type work vehicle concerning the conventional example which shows a turning state. It is a typical top view of the wheel type work vehicle which concerns on Embodiment 2 of this invention and abbreviate | omits the raising / lowering ladder. FIG. 10 is a schematic plan view of a wheeled work vehicle according to Embodiment 3 of the present invention, with the lifting ladder omitted. It is a typical top view of the wheel type work vehicle concerning conventional example 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Wheel type work vehicle, 2 ... Lower traveling body, 3 ... Front wheel, 4 ... Rear wheel, 5 ... Front outrigger, 6 ... Rear outrigger, 7 ... Constriction part, 7a ... Recessed part, 8 ... Engagement part, 9 ... Raising and lowering ladder, 9a ... Locking part, 9b ... Side plate, 9c ... Side plate L _W1 , L _W2 ... Right angle approach path width, L _WB ... Wheel base, r ... Curvature radius of constricted part, S ... Stone, W _C ... Vehicle width, W ... Vehicle width of the neck

Claims (2)

  A wheel traveling type lower traveling body having a four-wheel steering function is provided, and is mounted on the lower traveling body so as to be pivotable around a vertical axis, and supports a telescopic boom to which a work attachment is attached in an up and down manner. In the wheel type work vehicle provided with the upper swing body, a constricted portion having a width smaller than the width in the vehicle width direction before and after the lower travel body is formed between predetermined portions of the center of the wheel base of the lower travel body. A wheeled work vehicle characterized by that.   The elevating ladder comprising an engaging portion that is detachably engaged with an engaging portion provided on the lower traveling body is provided on the cab side of the constricted portion of the lower traveling body. 1. The wheeled work vehicle according to 1.

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