JP2014196048A - Articulated work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve stability of an articulated work vehicle, in which a front vehicle body and a rear vehicle body relatively are configured to swing around a coupling shaft so as to steer, with respect to a lateral turning during an articulated posture.SOLUTION: An articulated work vehicle 1 has an oil tank 5 on a rear part of a front vehicle body 2. The oil tank 5 is disposed at a position opposed to a boring device 20 as a work device with a coupling shaft 9 interposed therebetween, and is further bulged toward a rear vehicle body 3 than the position of the coupling shaft 9. Therefore, the oil tank 5 has a roll of a balance weight so as to improve stability with respect to a lateral turning of the work vehicle 1 during an articulated posture.

Description

  The present invention relates to an articulated work vehicle including a front vehicle body on which a working device is attached in front of itself and a rear vehicle body connected to the rear of the front vehicle body via a connecting shaft extending in the vertical direction of the vehicle body. .

This type of articulated work vehicle is steered by swinging the front and rear bodies relative to each other about the connecting shaft in the vehicle width direction, and travels with the traveling wheels mounted on the front and rear bodies. This is possible (see, for example, Patent Document 1).
By the way, an articulated work vehicle may be equipped with a long and heavy working device such as a drilling device for drilling work in front of the front vehicle body (FIG. 1 of Patent Document 1). reference). In this case, since the center of gravity of the front vehicle body is on the front side, when the work vehicle is in an articulated posture (a posture in which the front vehicle body and the rear vehicle body are relatively swung in the vehicle width direction), stability against rollover is reduced. There is a problem.

  With respect to such problems, the technique described in Patent Document 1 includes a plurality of detectors that detect the inclination angle, the refraction angle, and the displacement angle of the work device, respectively, based on detection signals from the detectors. The vehicle's overturn angle is calculated, and the calculated overturn angle is displayed on the display device, thereby preventing the work vehicle from overturning.

Japanese Patent Laid-Open No. 2-6282

However, although the technique described in Patent Document 1 can prevent the articulated work vehicle from tipping over, it is not a technique for improving the stability of the work vehicle itself against rollover during the articulated posture.
Therefore, the present invention has been made paying attention to such problems, and an object thereof is to provide an articulated work vehicle that can improve the stability of the work vehicle itself with respect to rollover in an articulated posture. And

  In order to solve the above-described problem, an articulated work vehicle according to an aspect of the present invention includes a front vehicle body on which a work device for performing necessary work is attached in front of itself, and a connecting shaft extending in the vehicle body vertical direction. A rear vehicle body connected to the rear of the front vehicle body via the articulated type, wherein the front vehicle body and the rear vehicle body swing relative to each other in the vehicle width direction around the connecting shaft to steer In the work vehicle, the front vehicle body has an oil tank at a rear portion thereof, and the oil tank is located at a position facing the work device with the connection shaft interposed therebetween, and further on the rear side than the position of the connection shaft. It is provided to extend to the vehicle body side.

  According to the articulated work vehicle according to one aspect of the present invention, the oil tank is provided at the rear portion of the front vehicle body, and the oil tank is located at a position facing the work device with the connection shaft interposed therebetween, and the connection shaft. Since the oil tank is provided so as to protrude from the position to the rear vehicle body side, the oil tank can have a balance weight role. Therefore, the stability with respect to the rollover of the work vehicle in the articulated posture can be improved.

  Here, in the articulated work vehicle according to one aspect of the present invention, a driver's seat is provided on the front vehicle body, the driver's seat is located above the connecting shaft, and the oil tank Positioned on the rear vehicle body side relative to the seat, the front upper portion of the rear vehicle body has a hollow shape so as not to interfere with the oil tank, and the oil tank covers the lower front portion of the rear vehicle body from above It is preferable that the projecting portion of the rear vehicle body protrudes to the bottom. With such a configuration, the total length of the work vehicle can be shortened and a compact configuration can be achieved while the oil tank has a balance weight role.

  In addition, in the compact configuration, the oil tank has a convex cylindrical surface having a circular arc with a radius centered on the connecting shaft, and an upper front corner of the rear vehicle body. The shape portion preferably has a concave cylindrical surface having a circular arc centered on the connecting shaft with a gap in the direction facing the cylindrical surface so as not to interfere with the cylindrical surface at the rear of the oil tank. With such a configuration, the back portion of the oil tank and the front upper part of the rear vehicle body have a hollow shape over the entire swing range in which the front vehicle body and the rear vehicle body swing relatively in the vehicle width direction around the connecting shaft. This is suitable for preventing mutual interference.

  As described above, according to the present invention, in an articulated work vehicle, it is possible to improve the stability against rollover of the work vehicle when in an articulated posture.

1 is a side view of an embodiment of an articulated work vehicle according to one aspect of the present invention. FIG. 2 is a plan view (straight running posture) of the articulated work vehicle shown in FIG. 1. FIG. 2 is a plan view (articulate posture) of the articulated work vehicle shown in FIG. 1.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings as appropriate.
As shown in FIGS. 1 and 2, this articulated work vehicle (hereinafter also simply referred to as “work vehicle”) 1 is a work vehicle used for drilling work in tunnel construction or the like. The vehicle has a carriage 10 having traveling wheels 7 and 8 and an outrigger 30. In the carriage 10, the front vehicle body 2 and the rear vehicle body 3 are formed separately, and the front and rear vehicle bodies 2, 3 are connected to each other by a connecting shaft 9 so as to be swingable in the left-right direction.

Specifically, the front vehicle body 2 is supported by left and right front wheels 7, and the rear vehicle body 3 is supported by left and right rear wheels 8. The front vehicle body 2 and the rear vehicle body 3 are connected to each other via a connecting shaft 9 that is positioned at the center in the vehicle width direction and extends in the vehicle body vertical direction. The front vehicle body 2 and the rear vehicle body 3 are connected to the connecting shaft 9. And can be swung relatively in the vehicle width direction.
In front of the front vehicle body 2, a drilling device 20 including a drifter 22, a guide shell 23, a boom 24, and the like is mounted as a working device for performing necessary work. A driver's seat 4 at the time of traveling is provided in the upper rear part of the front vehicle body 2. Further, an operation unit 26 other than traveling, such as drilling by the drilling device 20, is provided at the front upper part of the front vehicle body 2. Above the driver's seat 4 and the operation unit 26, a head guard 28 that covers the upper part and protects the operator from falling objects is supported by a machine base 29 of the front vehicle body 2.

  The rear vehicle body 3 is equipped with a drive unit 6 including an unillustrated engine, a hydraulic mechanism such as a hydraulic motor and a hydraulic pump. The punching device 20 is driven by a hydraulic mechanism of the drive unit 6. The cart 10 can travel by driving the left and right rear wheels 7 with a hydraulic motor provided in the drive unit 6. Further, between the front vehicle body 2 and the rear vehicle body 3, a hydraulic cylinder (not shown) that constitutes a steering mechanism with a connecting shaft 9 interposed is disposed. The hydraulic cylinder can be extended and contracted by a steering operation from the driver's seat 4. When changing the course of the work vehicle 1, the hydraulic cylinder is expanded and contracted according to the steering operation by the operator at the driver's seat 4, and the front vehicle body 2 is moved in the vehicle width direction with respect to the rear vehicle body 3 around the connecting shaft 9. By swinging, the work vehicle 1 can be steered left and right.

Here, an oil tank 5 for pressure oil supplied to and discharged from the hydraulic mechanism is mounted on the rear portion of the front vehicle body 2. The oil tank 5 is provided integrally with the front vehicle body 2 so as to protrude to the rear vehicle body 3 side of the drilling device 20 across the connection shaft 9 and from the position of the connection shaft 9.
In the present embodiment, the driver's seat 4 is located above the connecting shaft 9, and the oil tank 5 is disposed on the rear vehicle body 3 side with respect to the driver's seat 4. The upper front portion of the rear vehicle body 3 is formed so as not to interfere with the oil tank 5, and the oil tank 5 reaches the upper front portion of the rear vehicle body 3 (that is, the position covering the lower front portion of the rear vehicle body 3 from above). , Overhanging part).

  In particular, in the example of the present embodiment, as shown in FIG. 2, the oil tank 5 that protrudes to the front upper part of the rear vehicle body 3 has a convex portion with an arc having a radius R centered on the connecting shaft 9. The cylindrical surface 5t. Further, the hollowed portion at the front upper part of the rear vehicle body 3 is an arc centered on the connecting shaft 9 with a gap in the direction facing the cylindrical surface 5t so as not to interfere with the cylindrical surface 5t at the rear of the oil tank 5. And has a concave cylindrical surface 3d.

Next, functions and effects of the work vehicle 1 will be described.
In this articulated work vehicle 1, the front vehicle body 2 and the rear vehicle body 3 can swing relatively in the vehicle width direction around the connection shaft 9, and the connection shaft 9 is centered by a steering operation from the driver's seat 4. As described above, the work vehicle 1 can be steered left and right by swinging the front vehicle body 2 in the vehicle width direction with respect to the rear vehicle body 3.
And according to this work vehicle 1, it has oil tank 5 in the rear part of front side vehicle body 2, and this oil tank 5 opposes drilling device 20 which is a work device on both sides of connecting shaft 9. Since the oil tank 5 is provided so as to project to the rear vehicle body 3 side than the position of the connecting shaft 9, the oil tank 5 can have a balance weight role. Therefore, the stability with respect to the rollover of the work vehicle 1 in the articulate posture as shown in FIG. 3 can be improved.

  Further, according to this work vehicle 1, the driver's seat 4 is provided on the front vehicle body 2, the driver's seat 4 is located above the connecting shaft 9, and the oil tank 5 is located on the rear vehicle body from the driver's seat 4. 3, the front upper portion of the rear vehicle body 3 has a hollow shape so as not to interfere with the oil tank 5, and the oil tank 5 extends to the position where the lower front portion of the rear vehicle body 3 is covered from above. Since the oil tank 5 has a projecting shape, the oil tank 5 can have a balance weight, and the overall length of the work vehicle 1 can be shortened to have a compact configuration.

  In particular, the oil tank 5 has a convex cylindrical surface 5t having a circular arc with a radius R centering on the connecting shaft 9 at the rear portion thereof, and a hollow portion at the front upper portion of the rear vehicle body 3 is an oil tank. A concave cylindrical surface 3d having a circular arc centered on the connecting shaft 9 with a gap in the direction facing the cylindrical surface 5t so that the rear surface of the cylindrical surface 5t does not interfere with the cylindrical surface 5t. Therefore, during the articulate posture as shown in FIG. 3, over the entire swing range in which the front vehicle body 2 and the rear vehicle body 3 swing relatively in the vehicle width direction around the connecting shaft 9, This is suitable for preventing interference between the back portion of the oil tank 9 and the front upper portion of the rear vehicle body 3.

It should be noted that the articulated work vehicle according to the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the work vehicle 1 including the drilling device 20 used for drilling work in tunnel construction or the like has been described as an example of the work device. If the apparatus is an articulated work vehicle having a front vehicle body mounted in front of itself and a rear vehicle body connected to the rear of the front vehicle body via a connecting shaft extending in the vertical direction of the vehicle body, the necessary work is performed. Therefore, the present invention can be applied to a work vehicle equipped with various work devices.

DESCRIPTION OF SYMBOLS 1 Articulate type work vehicle 2 Front body 3 Rear body 4 Driver's seat 5 Oil tank 6 Drive unit 10 Cart 20 Drilling device (working device)
22 Drifter 23 Guide shell 24 Boom 26 Operation section 28 Head guard 30 Outrigger

Claims (3)

A working device for performing necessary work includes a front vehicle body mounted in front of itself, and a rear vehicle body connected to the rear of the front vehicle body via a connecting shaft extending in the vertical direction of the vehicle body. In the articulated work vehicle in which the front vehicle body and the rear vehicle body swing relative to each other in the vehicle width direction as a center to steer,
The front vehicle body has an oil tank at a rear portion thereof, and the oil tank projects to a position facing the work device with the connection shaft interposed therebetween and to the rear vehicle body side from the position of the connection shaft. An articulated work vehicle characterized by being provided.   A driver seat is provided on the front vehicle body, the driver seat is located above the connecting shaft, and the oil tank is disposed on the rear vehicle body side with respect to the driver seat, The front upper portion is formed in a hollow shape so as not to interfere with the oil tank, and the oil tank projects from the upper portion of the rear vehicle body to a position covering the lower front portion of the rear vehicle body from above. The articulated work vehicle according to claim 1.   In the oil tank, a rear portion thereof is a convex cylindrical surface having a circular arc with a radius centered on the connecting shaft, and a hollow portion at the front upper portion of the rear vehicle body is a cylindrical surface of the rear portion of the oil tank. 3. The articulated work according to claim 2, further comprising a concave cylindrical surface having a circular arc centered on the connecting shaft with a gap in a direction opposite to the cylindrical surface so as not to interfere with the cylindrical surface. vehicle.

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