JPS5943334B2 - Packing boxes for dump trucks, etc. - Google Patents

Description

[Detailed description of the invention] The present invention relates to a cargo box for a dump truck or the like.

Conventionally, in dump trucks, etc., when the loading box is tilted to discharge the load, the loading box is bent due to the load and its own weight, and in order to prevent it from bending or deforming, there is a A pair of main girders were fixed as strength members, and reinforcing frames were placed on the left and right sides of the main girders to prevent deformation in the left and right direction.

However, such a cargo box structure is not optimal for any type of dumping, and for example,
It is good to use a cylinder to lift approximately the middle part of the cargo box, as in Publication No. 156120, but in the dump method in which the front end of the cargo box is lifted by a cylinder, the distance between the lifting part and the pivot point becomes long, resulting in large bending. It wasn't appropriate.

Additionally, the center of gravity was raised by the height of the main girder installed on the bottom of the cargo box, resulting in poor running stability.

The present invention aims to provide a packing box structure that eliminates these drawbacks.

Embodiments of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a cargo box placed on a sub-frame 3 secured to a vehicle frame 2, and attached to the sub-frame 3 via a bracket 4 on the rear back surface thereof. It is pivoted so that it can be tilted freely.

Reference numeral 6 is a multi-stage cylinder whose lower part is pivotally supported by the sub-frame 3 and its base part is supported via a bracket 7 so as to be freely swingable, and the cargo box 1 is tilted around the pivot 5 by the operation of the cylinder 6.

Reference numeral 8 denotes a pair of side walls that are inclined inward to form an inclined surface, and the cargo box as a whole has a trapezoidal cross section.

Reference numeral 9 denotes a beam formed on the upper edge of the side wall 8, and a separate angle-shaped beam is formed in the channel-shaped bent portion 10 formed by bending the upper end of the side wall 8 outwardly (=opening inside the packing box). Bending member 11
The upper part is fixed to the lower side of the bent part 10, and the lower end is fixed to the inner side of the bent part 10, and the whole has a rectangular hollow cross section.

Reference numeral 12 is a protrusion vertically installed in the longitudinal direction at approximately the center of the side wall 8 to reinforce the side wall 8, and 13 is a floor plate of the cargo box formed in the shape of an inverted dish, the end of which is bent to form a blood relation. A portion 14 is formed and is integrally connected to the other end of a channel-shaped bent portion 15 formed at the lower end of the side wall 8.

Reference numeral 16 designates an integrated transverse member fixed at the rear and central portions of the cargo box, including a horizontal member 17 fixed to the back surface of the floorboard 13, a vertical member 18 fixed to the outer surface of the side wall, and both members 17, 18.
and a connecting member 19 connected to each other.

In addition, there is also a horizontal member 17 on the back side of the floorboard 13 at the front of the cargo box.
are fixed, and reinforcing members 20 are attached laterally at appropriate intervals.
In addition to being fixed, the front wall 21 of the loading box is also used as a cross member to firmly support the front of the loading box.

Reference numeral 22 denotes a beam formed at the lower edge of the side wall 8 and the floor plate plate edge 14.
A shielding plate 23 connects and closes the folded portion 15 opened to the inside of the cargo box to form a hollow cross section.

FIG. 5 shows a second embodiment, in which the side wall 8 stands perpendicularly to the floor plate 13 and has a U-shaped cross section as a whole.

As described above, according to the present invention, since the undulation cylinder 6 is attached to the front end of the cargo box 1, a downwardly convex bending effect is exerted between the front and back using the tilting pivot portion 5 of the cargo box 1 and the mounting portion of the cylinder 6 as fulcrums. However, as is clear from the cross-sectional shape, the neutral axis is located at the center or slightly lower than the center in the cross-section of the packing box 1, and the beam structure 9 at the top of the side wall on the compression side is firmly supported against the maximum compression force. In addition, since the lower part of the side wall on the tension side is also formed into a beam structure 22, it is firmly supported against the maximum tension force.

Therefore, in the front-rear direction of the cargo box 1, the beam structures at the upper and lower ends mainly maintain rigidity.

In addition, in order to maintain the rigidity of the entire cargo box by firmly connecting these beam structures, cross members are provided at the rear and center of the cargo box to form a strong frame.
Other parts do not require heavy reinforcements and are lightweight.

Further, within the closed cross section of the lower beam 22, the upper cross member 16
and the lower transverse member 16 are connected (connecting member 1
9), the lower corner of the cross member 16 that receives the most load from the load is reinforced in conjunction with the lower beam 22.
The cross-sectional shape itself is also prevented from deforming.

Furthermore, the cargo box position can be lowered by the height of the main girder in conventional cargo boxes, and the center of gravity of the vehicle when loaded is lowered, improving driving stability.

In addition, since the joint surfaces at the top and bottom of the side walls are open inward, they are hidden from the outside, so even if rust occurs, it will not be noticeable.
A desirable appearance can be obtained.

In addition, the side walls and floorboards can be manufactured separately, which is preferable from the viewpoint of production technology.

[Brief explanation of the drawing]

FIG. 1 is an overall side view of an embodiment of the present invention, FIG. 2 is a partial sectional view thereof, FIG. 3 is a bottom view, and FIG. 4 is a partially cutaway perspective view.
FIG. 5 is a sectional view of the second embodiment. 1 is a packing box, 8 is a side wall, 9 is an upper beam, 13 is a floor plate, 16.
17 and 18 are cross members, and 22 is a lower beam.

Claims (1)

[Scope of Claims] 1. A cargo box is pivotally supported on the vehicle body at the rear thereof so as to be freely tiltable, and a cylinder for raising and lowering is installed between the front end of the cargo box and the vehicle body. A cross member is provided in the center, the cross member integrally connects the vertical beams provided at the upper and lower edges of the side wall, and the lower edge vertical beam and the cross member are connected within the closed cross section of the lower edge vertical beam. Characteristic packing boxes for dump trucks, etc. 2. A loading box for a dump truck or the like according to claim 1, wherein the cross member is composed of a horizontal member fixed to the back surface of the floorboard, a vertical member fixed to the outer surface of the side wall, and a connecting member connecting both members.