JP2558945Y2 - Boom work vehicle - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boom work vehicle such as an aerial work vehicle.

[0002]

2. Description of the Related Art As shown in FIG. 3, an extensible boom 33 is attached to the front of a vehicle body 31 of an aerial work vehicle 30 so as to be able to move up and down and turn. This boom 33
A work table 34 is attached to a tip of the boom 33, and the work table 34 is moved up and down through each operation of the boom 33 using hydraulic pressure. In addition, a hydraulic power unit 35 is mounted substantially at the center of the vehicle body 31, and generates and supplies hydraulic pressure used for operating the boom 33. By the way, in the aerial work vehicle 30, when traveling on a general road or the like, the boom 33 is stored in the vehicle body 31 as shown in the figure. That is, the boom 33 is turned down so that its tip is lower than the horizontal level, and the boom 33 is swung so as to extend toward the right side (upper side in the figure) of the vehicle body 31 and to the rear as shown in FIG. Store. Work table 3
4 is stored in the boom 33 so as to be parallel to the side surface of the boom 33 in plan view. This allows
The boom 33 and the workbench 34 can be stored so as not to protrude from the vehicle body 31, so that when the aerial work vehicle 30 runs, it can be prevented from hindering the running of other vehicles.

[0003]

However, in a state where the boom 33 and the like are stored in this manner, as shown in FIG. 4, the center of gravity G of the boom 33 is located on the right side of the center line L of the vehicle body 31 in the vehicle width direction. It is skewed. Therefore, the position of the center of gravity of the aerial work vehicle 30 as a whole is also shifted to the right. Also, the hydraulic power unit 35 is
, The center of gravity of the aerial work vehicle 30 as a whole increases. Therefore, there is a problem that the running stability of the aerial work vehicle 30 may be adversely affected by these factors.

The present invention has been made in view of such a problem, and has as its object to provide a boom working vehicle capable of running stably with a boom or the like stored therein.

[0005]

In order to achieve the above object, in a boom working vehicle according to the present invention, a power unit for generating a fluid pressure supplied to the boom is viewed from a center of a vehicle body in a vehicle width direction. In the retracted state, the boom is mounted on the side opposite to the side where the center of gravity is located, and is mounted at a low position at the same height as the minimum ground clearance of the vehicle body.

[0006]

In such an aerial work vehicle, when the boom is stored so that the center of gravity of the boom is located on one side in the vehicle width direction, the power unit is mounted on the other side, so that the boom work is performed. Weight balance in the vehicle width direction of the entire vehicle can be achieved. Further, since the power unit is mounted at a low position on the vehicle body, the height of the center of gravity of the entire boom working vehicle is reduced. For this reason, the boom working vehicle can run stably.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an aerial work vehicle (boom work vehicle) 10 according to the present invention. At the front of the body 11 of the aerial work vehicle 10, a turntable 12 that can freely turn horizontally with respect to the body 11 is attached. The constructed boom 13 is pivotally mounted so as to be able to move up and down. A support arm 14 extending in the horizontal direction is provided at the tip of the boom 13.
The work table 14 is attached via a. Note that the support arm 14a can freely swing horizontally with respect to the tip of the boom 13, and the worktable 14 can freely swing horizontally with respect to the support arm 14a. For this reason, an operator (not shown) boarding the worktable 14 turns the turntable 12 (hereinafter, referred to as “turning operation”).
The operation of raising and lowering the boom 13, the horizontal rotation of the support arm 14 a, and the work table 14.
The user can move to an arbitrary altitude and perform the work through the horizontal swing operation.

On the other hand, when the aerial work vehicle 10 is driven, the boom 13 and the worktable 14 are stored in the vehicle body 11 as shown in FIG. After the boom 13 is contracted to the fully contracted state, the boom 13 is operated to fall down until its tip is lower than the horizontal level. At the same time, as shown in FIG. 2, the boom 13 is turned so that its tip is located at the rear corner of the vehicle body 11 at the right side (the upper side in the figure). Thus, the boom 13 is stored in the vehicle body 11. On the other hand, the worktable 14 is provided with a support arm 14a.
The work table 14 itself is horizontally rotated and horizontally swung to be folded so as to be substantially parallel to the stored boom 13. Thus, the workbench 14 is stored with respect to the boom 13 and the vehicle body 11, and the stored boom 13 and the worktable 14 are compactly stored within the length and width of the vehicle body 11. However, the center of gravity G of the boom 13 is located on the right side of a center line L (hereinafter, referred to as a center line) of the vehicle body 11 in the vehicle width direction.
Bad overall weight balance.

The operation of the boom 13 and the work table 14 is performed by using hydraulic pressure.
The hydraulic pressure is generated by a hydraulic power unit 15 mounted on the vehicle body 11. This hydraulic power unit 15
Is composed of an engine and a hydraulic pump and the like (both not shown) driven by the engine, and has a considerable weight. For this reason, in the aerial work vehicle 10, as shown in FIG. 2, the hydraulic power unit 15 is mounted on the side edge of the vehicle body 11 on the opposite side of the center line L from the side where the center of gravity G of the boom 13 is located. Installed. Thereby, the weight of the hydraulic power unit 15 is balanced with the weight of the boom 13, and the weight balance of the aerial work vehicle 10 as a whole can be corrected.

As shown in FIG. 1, the hydraulic power unit 15 has a bottom surface defined by a prescribed minimum ground clearance H of the vehicle body 11.
Is mounted on the lower part of the vehicle body 11 so as to be located at a height corresponding to Therefore, the aerial work vehicle 10
The position of the center of gravity as a whole can be lowered, and the running stability of the aerial work vehicle 10 can be improved in combination with the correction of the weight balance.

Further, on the side surface of the hydraulic power unit 15 attached to the vehicle body 11 as described above, an opening / closing portion 15 opened during maintenance of the hydraulic power unit 15 is provided.
a is provided. Therefore, compared to the conventional one where the boom is stored right above and is in the way,
Maintenance can be performed easily.

In the above embodiment, the aerial work vehicle is described, but the boom work vehicle of the present invention is not limited to this, and may be, for example, a crane vehicle.

[0013]

[Effect of the Invention] As described above, in the boom working vehicle of the present invention, the power unit can be mounted on the side opposite to the side where the center of gravity of the boom is located with respect to the center in the vehicle width direction. It can be corrected to be located at the center in the direction, so that the weight balance of the vehicle body can be made appropriate. Further, since the power unit is attached to the lower part of the vehicle body, the center of gravity of the vehicle body can be lowered. Therefore, the boom work vehicle can run stably.

[Brief description of the drawings]

FIG. 1 is a side view of an aerial work vehicle according to the present invention.

FIG. 2 is a plan view of the aerial work vehicle.

FIG. 3 is a side view of a conventional aerial work vehicle.

FIG. 4 is a plan view of a conventional aerial work vehicle.

[Explanation of symbols]

 13,33 Boom 15,35 Hydraulic power unit G (boom) center of gravity L Center line

Claims (1)

(57) [Scope of request for utility model registration] A boom is provided on a vehicle body for raising and lowering and turning by receiving a supply of fluid pressure, and the boom is turned so that its center of gravity is located at a position deviated from the center of the vehicle body in the vehicle width direction. A boom working vehicle stored in the vehicle body, wherein the vehicle body is provided with a power unit that generates a fluid pressure supplied to the boom, and the power unit is located at the center in the vehicle width direction. A boom working vehicle, which is mounted on a side opposite to a side where a center of gravity of the boom in a retracted state is located, and is mounted at a low position equivalent to a minimum ground height in the vehicle body.