JPS6257536B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dump truck with a simple structure in which the floor plate of a cargo box can be reinforced without increasing the overall height of the cargo box.

In a conventional dump truck, as shown in Fig. 2, a subframe 02 on a main frame 01,
A lift mechanism L is provided between the main girders 05 on the lower surface of the cargo box 03 mounted on the sub-frame 02, and the cargo box 03 is tilted by the operation of the lift mechanism L. Hydraulic cylinder 09, triangular plate 011, tension link 01
Naturally, installation space is required to install this, but in the past, in order to fit the lift mechanism L between the floor plate 04 of the cargo box 03 and the subframe 02, the floor plate 04 directly above the lift mechanism L was The reinforcing cross beams were omitted to expand the installation space, so that the lift mechanism L could fit between the floor plate 04 and the subframe 02 without increasing the overall height of the main beam 05.

However, when doing this, there was a problem in that the strength of the floorboard was partially extended and weakened over the whole area.

Furthermore, the bracket 012 on the loading box side is attached to the main girder 05.
It is attached to a part of the crossbeam 020, but since it is fixed in a cantilevered manner on one side, it is easily bent, and the crossbeam 02
If the 0 and floor plate 04 were not made thicker, there was a possibility that they would deform, leading to an increase in weight.

Therefore, the present invention provides a relief part in the upper part of the lift mechanism to ensure sufficient space for installing a crossbeam for reinforcing the floorboard, thereby solving the above-mentioned problems of the conventional method. The object of the present invention is to provide a dump truck with a simple structure that can improve discharge efficiency.

Hereinafter, one embodiment of the present invention will be described with reference to FIG. 1. A subframe 2 is mounted on a main frame 1 of a dump truck.
A cargo box 3 is tiltably mounted on top.

A lift mechanism L for tilting the cargo box 3 is provided between the subframe 2 and the left and right main beams 5 at the bottom of the cargo box 3. Next, to explain the structure of this lift mechanism L, a trunnion bracket 7 is fixed to the subframe 2 by a plurality of mounting bolts 6, and a hydraulic cylinder 9 is connected to the trunnion bracket 7 via a pivot shaft 8. The base end is pivotally supported so as to be able to rise and fall, and the top of a triangular plate 11 is pivotally attached 10 to the tip of the hydraulic cylinder 9. The upper part of the triangular plate 11 is cut out to form a relief part 21, a space 22 is formed between the relief part 21 and the floor plate 4, and a reinforcing girder 23 is fixed to the back surface of the floor plate 4 in the space 22 part. . Reference numeral 12 is fixed to a cross beam 20 and a reinforcing beam 23 arranged on the back side of the floorboard and to the back side of the floorboard 4 by means of a bracket, and one end (the right side in the figure) of the triangular plate 11 is pivotally attached 13 via the bracket 12. Furthermore, the triangular plate 11
At the other end (left end in the figure) is a tension rod 14.
One end is pivoted 15. The other end of the tension rod 14 is pivotally connected 17 to a bracket 16 fixed to the subframe 2.

When the hydraulic cylinder 9 is extended, the triangular plate 1
1 is erected and the cargo box 3 connected thereto can be tilted using a pivot support (not shown) as a fulcrum.

At this time, the lifting force by the lift mechanism L is transmitted to the cargo box via the bracket 12, but is transmitted from the bracket 12 to the reinforcing beam 23 and the cross beam 20 in a distributed manner, so that no concentrated load occurs.

As described above, according to the present invention, by providing a relief part at the top of the triangular plate that constitutes the lift mechanism, the lift cylinder can be disposed below the floor plate without increasing the overall height of the main girder, and the floor plate can be reinforced. The vertical space necessary to secure the crossbeam to the back of the floor plate can be secured between the subframe and the front of the floor plate, so the floor plate directly above the lift cylinder can be secured without raising the center of gravity of the cargo box. Reinforcement becomes possible, and the strength of the entire floorboard can be significantly increased.

In addition, the bracket on the cargo box side is fixedly supported not only by the cross beam but also by the reinforcing girder, so unnecessary forces such as bending are not applied when the cargo box is tilted, and thickening for reinforcement can be prevented. .

[Brief explanation of the drawing]

FIG. 1 is a side view of the device of the present invention, and FIG. 2 is a side view of the conventional device. 1... Main frame, 2... Sub frame,
3... Packing box, 4... Floor plate, 5... Main girder, 12...
Bracket, 20... Cross beam, 23... Reinforcement girder, L
...Lift mechanism.

Claims (1)

[Claims] 1 A cargo box is tiltably mounted on a subframe fixed to a main frame, and a lift mechanism for tilting the cargo box is provided between the subframe and the main girder of the cargo box, and the lift The mechanism is a dump truck consisting of a triangular plate with one end pivoted to the cargo box, a hydraulic cylinder and a tension rod with one end pivoted to the triangular plate and the other end pivoted to the subframe. By providing a relief part, a space is created between the cargo box floor plate and
A dump truck comprising a reinforcing girder fixed to the cargo box floor plate within the space, and a bracket on which the top of the triangular plate is pivotally supported between the reinforcing girder and the cross girder.