JP2018171946A - Cargo box and vehicle having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure the strength of a packing box and to obtain a maximum load capacity while making a structure in which earth and sand or the like can be easily discharged. SOLUTION: A bottom plate 11 in which a first steel plate is V-bent at an obtuse angle at least once so that a crease 11a extends in the longitudinal direction, and a second steel plate in which the inner angle is obtuse so as to extend the crease 12a in the longitudinal direction are multi-staged. A pair of side plates 12 that are V-bent and coupled to both ends of the bottom plate 11 in the width direction are provided. At least one of the creases 11a of the bottom plate 11 is extended in the central portion in the width direction, and the cross-sectional shape is U-shaped as a whole. [Selection diagram] Fig. 1

Description

  The present invention mainly relates to a packing box that can be mounted on a vehicle such as a dump truck and a vehicle including the same, and more particularly to improvement of a cross-sectional shape thereof.

  Conventionally, earth and sand, residual soil, waste and other waste materials have been accommodated and transported in a packing box having a substantially rectangular cross section. Since this packing box is tilted by a tilting device such as a dump truck, it is necessary to improve the strength of the bottom to withstand the load. As a method for improving the strength of this packing box, a vertical girder and a horizontal girder are provided at the bottom. It is possible.

  However, providing a stringer and a horizontal girder at the bottom and improving the strength with the stringer and horizontal girder increases the weight of the cargo box by that amount, and as a result, the cargo box is restricted due to the weight of the entire vehicle. There is a problem that the volume and maximum load weight of the vehicle must be reduced.

  Therefore, for example, as in the waste material transport container of Patent Document 1, there is known a structure in which different types of steel plates are joined and divided into a bottom plate and side plates on both sides thereof. In this container, the lower end portion of the divided upper plate and the upper end portion of the lower plate are curved in the shape of a curved surface or an arcuate shape with the cross section bulging outward along the longitudinal direction of the container. The bending reinforcement part of the upper side plate divided into the upper and lower parts, and the folding part bulging outward along the longitudinal direction of the container of the bending reinforcement part at the upper end part of the lower side plate. The reinforcing part is overlapped and welded to form a side-by-side joined structure. The bottom plate of the container is made of wear-resistant steel and high-strength steel, and both sides of the bottom plate of the container are inferior in wear resistance and high tension compared to Swedish steel. Curved surface with a radius of curvature of 100 to 300 mm in the lower part of any one of rolled steel for general structure, rolled steel for welded structure, hot rolled steel sheet, carbon steel for machine structure, and rolled stainless steel Side plates obtained by integrally bending the corners of the shape are joined together. By constructing in this way, the fixed-size steel plate can be divided into an appropriate size such as one-half of the size without having to use a single large steel plate for the waste material transport container. A stainless steel plate made of wear-resistant steel and high-strength steel is combined with rolled steel for general structures on the side plate so that containers can be formed economically.

JP 2014-43314 A

  By the way, if the bottom of the packing box is flattened, the distribution of earth and sand may be uneven when tilting the packing box and discharging earth and sand, etc., and there is a problem that it is difficult to ensure vehicle stability at the time of discharging. .

  Moreover, in the thing of patent document 1, although it has comprised with wear-resistant steel and high-tensile steel giving priority to a baseplate, it is necessary to bend a corner part comparatively big curved surface, and a side plate is easier to process than a baseplate. Therefore, there is a restriction that it is difficult to form a high-strength steel plate.

  The present invention has been made in view of such a point, and an object of the present invention is to increase the maximum loading capacity while making the structure easy to process and easily discharge earth and sand.

  In order to achieve the above object, in the present invention, the bottom plate and the side plate are V-bent in multiple stages.

Specifically, in the first invention, on the premise of a box-shaped packing box with the top opened,
The above packing box is
A bottom plate that is V-bent so that the inner angle after the first steel plate is bent at least once so that the crease extends in the longitudinal direction becomes an obtuse angle;
A second steel plate is bent in multiple stages at an obtuse angle so that the crease extends in the longitudinal direction, and includes a pair of side plates coupled to both ends in the width direction of the bottom plate,
At least one of the folds of the bottom plate extends in the center in the width direction, and the cross-sectional shape as a whole is U-shaped.

  According to the above configuration, the crease provided in the central portion in the width direction improves the strength of the bottom plate, and when tilting and discharging the sand and the like, the sand and the like gather in the central portion in the width direction, so that the distribution is not good. It is not uniform and it is easy to ensure vehicle stability during discharge. In addition, by performing V bending in a multi-stage including the side plate, it is possible to increase the strength and secure the inner width and height and increase the capacity of the packing box. Further, since only the V-shaped bending is performed without performing the R-bending to obtain a U-shaped cross section, it is not necessary to use a press device for performing a large R-bending, and the processing is easier than the R-bending. For this reason, if necessary, the side plate can also be composed of wear-resistant steel or high-tensile steel. Note that “V bending” is, for example, bending a steel sheet using a bending punch and a bending die each having a triangular cross section, and unlike R bending, a crease is formed relatively clearly. The “width direction center” means not only the center in the width direction but also the vicinity thereof.

In the second invention, in the first invention,
Both ends of the bottom plate in the width direction extend flat, and are welded to each other in a state where the flat ends of the side plate are stacked on both ends of the width direction.

  According to said structure, by laminating | stacking a side plate on a bottom plate and welding, earth and sand etc. are hard to accumulate in a welding part, and earth and sand etc. approach a center smoothly. Further, the welded part is not easily damaged by earth and sand approaching the center.

In the third invention, in the first or second invention,
The bending angle with respect to the horizontal plane at the center in the width direction of the bottom plate is the smallest, including the bending angle of the side plate, the angle of bending by V-bending is at least the second fold beyond the joint between the side plate and the bottom plate, It gradually increases as the distance from the central portion in the width direction increases.

  According to the above configuration, by gradually increasing the bending angle from the bottom plate to the side plate as a whole, the overall shape of the packing box is kept as low as possible while keeping the inner width and height as large as possible. can do. In addition, the angle bent by the V-bending outside the third of the side plates may be gradually reduced.

A vehicle according to a fourth aspect of the invention includes the packing box according to any one of the first to third aspects,
At least one crease extending in the central portion in the width direction is disposed between the pair of subframes of the chassis.

  According to the above configuration, it is possible to obtain a vehicle with high merchantability having a low center of gravity, low manufacturing cost, easy discharge of earth and sand, and a large cargo box.

  As described above, according to the present invention, the bottom plate is bent at an obtuse angle at least once so that the crease extends in the longitudinal direction, and the pair of side plates are bent at multiple steps at an obtuse angle so that the crease extends in the longitudinal direction. The bottom plate is connected to both ends in the width direction, and the folds of the bottom plate are extended in the center in the width direction so that the overall cross-sectional shape is U-shaped. It is possible to increase the capacity of the packing box and the maximum loading weight while making the structure easy.

It is the II sectional view taken on the line of FIG. 2B. It is a side view showing a dump truck in which a packing box according to an embodiment of the present invention is mounted. It is a top view which shows the dump truck in which the packing box which concerns on embodiment of this invention was mounted. It is a rear view which shows the dump truck in which the cargo box based on embodiment of this invention was mounted. It is a perspective view which shows a packing box. It is a partially expanded sectional view of FIG. 1 which concerns on other embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIGS. 2A to 3 show a dump truck 1 as a vehicle including a cargo box 10 according to an embodiment of the present invention. The dump truck 1 includes a chassis 2 and a cab 3 that can travel. The cargo box 10 is supported in a tiltable manner on the rear end side of a pair of subframes 2a (shown in cross section in FIG. 1) extending in the front-rear direction mounted on the chassis 2. The front end of the packing box 10 is connected to a tilting cylinder 4 provided in the subframe 2a, and the packing box 10 can be tilted by expanding and contracting the tilting cylinder 4 as shown by a two-dot chain line in FIG. 2A. It has become. The tilt cylinder 4 is formed of, for example, a telescopic hydraulic cylinder, and is directly connected to the front side of the cargo box 10 so that the front side of the cargo box 10 is lifted and tilted. A fuel tank 5 is provided below the packing box between the wheel bases of the chassis 2.

  As shown also in FIG. 3, the packing box 10 has a box shape with the top opened, a bottom plate 11, a pair of side plates 12 welded to both ends in the vehicle width direction, a front plate 13 extending vertically, and an open / close And a possible tailgate 14. By tilting the packing box 10 by the tilting cylinder 4, earth and sand in the packing box 10 can be discharged from the tailgate 14.

  As shown in FIG. 1, the bottom plate 11 is made of wear-resistant steel having a thickness of 6 mm as a first steel plate, for example, and the first steel plate is bent at an obtuse angle at least once so that the fold line 11a extends in the longitudinal direction. Has been formed. One of the folds 11a of the bottom plate 11 extends over substantially the entire length of the bottom plate 11 at the center in the width direction. For example, the bottom plate 11 is bent into a V-shape so that the bending angle θ1 = 5 ° from the left and right is substantially 10 ° in total and the inner angle after bending is 170 °.

  The bottom plate 11 is provided with a pair of vertical beams 15 by welding or the like so as to be positioned at a predetermined distance from the first fold line 11a at the center portion in the width direction and positioned directly above the subframe 2a of the chassis 2. Yes. The packing box 10 may be configured without providing the stringers 15.

  Second folds 11a are respectively formed on the outer sides in the width direction of the pair of subframes 2a, and further bent, for example, θ2 = 10 °. Thereby, the inner angle after bending becomes 170 °.

  Further, the side plate 12 is welded at a position away from the second fold line 11a by a predetermined distance. The overlapping amount W of the coupling portion 17 at the time of welding is, for example, W = 50 mm, but is not limited thereto. The flat portion of the bottom plate 11 and the flat portion of the side plate 12 are overlapped, and the tip of the flat portion of the side plate 12 is welded. In this manner, the side plate 12 is overlapped on the bottom plate 11 and welded, so that earth and sand or the like do not collect at the coupling portion and smoothly approach the center. Further, the welded part is not easily damaged by earth and sand approaching the center.

  The side plate 12 is made of, for example, wear-resistant steel having a thickness of 4 mm as the second steel plate, but the second steel plate may be made of a material different from the first steel plate or the same material. The first fold 12a of the side plate 12 extends in the longitudinal direction in the same manner as the bottom plate, and the inner angle after bending is 165 ° when the bending angle θ3 = 15 °. The bending angle of the fold 11a is determined in consideration of lowering the center of gravity of the packing box, preventing interference with the fuel tank, securing the capacity of the packing box, and the like.

  For example, the second fold line 12a of the side plate 12 has a bending angle θ4 = 25 °, and the inner angle after bending is 155 °. The third fold 12a is θ5 = 20 ° and is now smaller in order to raise the side plate 12 vertically. The fourth fold line 12a becomes even smaller at θ6 = 15 °, and finally the side plate 12 stands vertically.

  In this manner, the pair of side plates 12 are joined to both ends in the width direction of the bottom plate 11 by bending the second steel plate in an obtuse angle in multiple stages so that the fold line 12a extends in the longitudinal direction. For example, a reinforcing portion 16 having a rectangular frame shape in cross section is provided at the upper end of the side plate 12 and is reinforced.

  Due to the bottom plate 11 and the pair of side plates 12, the cross-sectional shape of the cargo box 10 is U-shaped as a whole, and the fold line 11 a at the center in the vehicle width direction is the most in the cargo box 10 except for the vertical girder 15. It is low.

  Further, as shown in FIG. 1, interference with the fuel tank 5 is prevented by appropriately securing the bending angle of the bottom plate 11 so as not to increase too much.

  Further, as shown in FIG. 1, a receiving tree 18 is provided on the subframe 2a. The receiving tree 18 plays a role of preventing damage and absorbing shock when the stringer 15 comes into contact. .

  The number and angle of bending of the bottom plate 11 and the side plate 12 are not limited to the above.

  With the configuration as described above, in the packing box 10 of the present embodiment, the strength of the bottom plate 11 is improved by the fold line 11a provided in the center portion in the width direction, and the sand and the like are discharged by being tilted by the tilt cylinder 4. Occasionally, earth and sand gather at the center in the width direction and the distribution thereof does not become uneven, and it is easy to ensure vehicle stability during discharge. Further, as compared with the configuration in which the bottom surface of the packing box 10 is flat, the center of gravity position when earth and sand are loaded is corrected by the crease 11a provided at the center in the width direction. Furthermore, when the packing box 10 is tilted to discharge the internal sand and the like, the earth and sand etc. are likely to approach the center.

  In addition, since the strength of the entire packing box 10 can be increased by performing V bending including the side plate 12 in multiple stages, it is not always necessary to provide vertical and horizontal girders, and the weight of the entire packing box 10 can be reduced. The inner box width and inner box height can be secured to increase the capacity of the packing box.

  Further, since only the V-shaped bending is performed without performing the R-bending to obtain a U-shaped cross section, it is not necessary to use a press device for performing a large R-bending, and the processing is easier than the R-bending.

  The folding angle θ1 at the central portion in the width direction of the bottom plate 11 is the smallest, and the folding angles θ1 to θ4 including the folding angles θ3 and θ4 of the side plate 12 are gradually increased as the distance from the central portion in the width direction increases. The overall shape of the box 10 can be such that the center of gravity is kept low while keeping the inner width and height as large as possible.

  Therefore, according to the packing box 10 which concerns on this embodiment, it can be set as a structure which is easy to process and discharges earth and sand etc. easily. Moreover, the dump truck 1 with high merchantability provided with the packing box 10 having a low center of gravity and low manufacturing cost can be obtained.

(Other embodiments)
The present invention may be configured as follows with respect to the above embodiment.

  That is, in the above-described embodiment, the tilting cylinder 4 is a direct pressing structure of a telescopic hydraulic cylinder, but it may be an under deck type that pushes up the vertical girder 15 of the packing box 10 using a link or the like. If the present invention is applied to the under deck type, the rigidity of the bottom plate 11 is high, so that the vertical and horizontal girders can be simplified. For this reason, the entire packing box including the vertical girder and the horizontal girder can be reduced in weight, and as a result, the loading weight of the packing box 10 can be secured.

  In the above embodiment, one fold line 11a is provided at the center in the width direction between the pair of subframes 2a. However, as shown in an enlarged view in FIG. 4, the width direction between the pair of subframes 2a in the bottom plate 11 ′. Two or more folds 11a ′ may be provided at the center. That is, the bottom plate 11 ′ may have a flat portion 11 b ′. Also in this case, the bending angle may be gradually increased from θ1 to θ3.

  In the above embodiment, the present invention is applied to the cargo box 10 of the single-car dump truck 1, but may be applied to a trailer-type cargo box.

  In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or a use.

1 Dump truck (vehicle)
2 Chassis
2a Subframe
3 cab
4 Tilt cylinder
5 Fuel tank
10 Packing box
11 Bottom plate
11a crease
12 Side plate
12a crease
13 Front plate
14 Tailgate
15 column
16 Reinforcement part
17 joint
18 Receiving tree

Claims (4)

In the box-shaped packing box with the top open,
A bottom plate that is V-bent so that the inner angle after the first steel plate is bent at least once so that the crease extends in the longitudinal direction becomes an obtuse angle;
The second steel plate is bent at an obtuse angle in multiple stages so that the crease extends in the longitudinal direction, and includes a pair of side plates coupled to both ends in the width direction of the bottom plate,
At least one of the folds of the bottom plate extends in the center in the width direction, and the entire cross-sectional shape is U-shaped. The packing box according to claim 1,
A packing box, wherein both ends in the width direction of the bottom plate extend flatly and are welded to each other in a state where the flat ends of the side plate are superimposed on both ends in the width direction. In the packing box according to claim 1 or 2,
The bending angle with respect to the horizontal plane at the center in the width direction of the bottom plate is the smallest. A packing box characterized by gradually increasing with increasing distance from the central portion in the width direction. A vehicle in which the packing box according to any one of claims 1 to 3 is mounted so as to be tiltable,
The vehicle according to claim 1, wherein the at least one fold extending in the central portion in the width direction is disposed between a pair of subframes of the chassis.

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