JPS6052008B2 - Rear pivot of cargo box - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rear pivot support device for a cargo box of a dump truck or the like.

Conventionally, in a rear pivot device that allows the cargo box to tilt rearward and pivot to the chassis side, a hinge bracket and its reinforcement were attached to the main girder of the cargo box by welding. Since the width of the gap between the main girders is quite small compared to the overall width of the shipping box, the width of the gap between the hinge brackets mentioned above is also relatively small. Deformation has occurred.

Further, the work of welding the hinge brackets and the like to accurate main girder positions required skill and was troublesome. In addition, since the hinge bracket was projected downward from the main girder and its lower end was pivoted to the chassis side, the rear end of the deck plate approaches the ground when the cargo box is tilted to its maximum, preventing the discharge of loaded materials such as earth and sand. There was also the problem of it getting worse. The present invention has been made in view of the above points, and makes it easy and quick to attach the rear surface of the cargo box, improves the torsional rigidity and strength of the cargo box, further improves the earth and sand discharge performance, and improves the ability to secure the deck board above the ground. The purpose of the present invention is to lower the height and improve driving stability during cornering, etc., and the present invention is characterized by having holes in the left and right horizontal directions and arranged in parallel at predetermined intervals. The inner and outer mounting plate parts and the connecting plate part that bridges the left and right of the inner and outer mounting plate parts to form a downward opening recess are integrated to form a female member, and the female member is attached to the main girder of the cargo box. A hinge bracket that is fixed in contact with the back surface of the deck and the crossbeam in the range on the left and right sides of the outside and protrudes upward from the rear end of the chassis side is fitted into the downward opening recess of the female member, and the hinge bracket The pivot shaft is inserted through the hole in the inner and outer mounting plate portions and the hole in the inner and outer mounting plate portions in the form of a skewer. Hereinafter, the present invention will be explained in detail based on illustrated embodiments. In Figures 1 to 5, 1 is a cargo box for loading earth and sand, etc., and has an upwardly opening box shape with a front wall, side walls, rear door, and a deck plate 2 forming the floor (not shown). The back surface 3 of the deck board 2 has a pair of left and right main girders 4, 4.
are integrally fixed in the vertical direction, and an appropriate number of cross beams 5 are fixed in the horizontal direction by welding, and a concrete example is shown in the case of a double cross structure.

Reference numeral 6 denotes a chassis frame on which the main girder 4 of the cargo box 1 in a traveling state is placed via a support member 7 .

Reference numeral 8 denotes a rear pivot device that pivots the cargo box 1 so that it can tilt rearward from the solid line in FIG. The cylindrical cross beam 9 is extended so as to protrude outward from the outer surface 6a of the chassis frame 6, and therefore extends beyond the outer surface 1 of the main beam 4 of the cargo box 1.
It also protrudes outward from 0.

Reference numeral 12 denotes a hinge bracket, which is provided in an upwardly projecting manner at positions on the left and right outer sides of the outer surface 10 of the main beam 4 and the outer surface 6a of the chassis frame 6. Specifically, the rear surface 9a of the cross beam 9 has a rectangular or square cross section.
and an inverted L-shaped backing plate part 13 that comes into contact with the upper surface 9a, and two parallel side plates 14, 1 that stand up from the corresponding plate part 13.
4, and the side plates 14, to bridge the left and right side plates 14, 14,
The hinge bracket 12 is composed of a cylindrical boss portion 15 fixed to the upper end portion of the hinge bracket 14 and a reinforcing plate (not shown) added as desired, and a pivot shaft 16 (described later) is inserted through the boss portion 15. It has a hole 17. However, 18
is a female member, and has relatively thick inner and outer mounting plate parts 2 having holes 19 in the left and right horizontal directions and arranged in parallel at a predetermined interval.
0, 21, and a relatively thin connecting plate part 23 which bridges the inner and outer mounting plate parts 20, 21 on the left and right, maintains the above-mentioned predetermined distance, and forms a downward opening recess 22.

In a specific example, the cross section of the connecting plate part 23 has a downward opening channel shape, and a pair of left and right inner and outer mounting plates 20, 21 are abutted on the left and right side plate parts, and as shown in FIG. 3, welding 24...
The female member 18 is formed by integrating both parts. Therefore,
The hole 19 is formed in a straight line not only in the inner and outer mounting plate parts 20 and 21 but also in the connecting plate part 23. Although not shown, the inner and outer mounting plate parts 20 and 21 and the connecting plate part 23 are
It is also preferable to form an integral structure by casting or forging.

As shown in FIGS. 5 and 4, the female member 18 configured in this way is brought into contact with the deck rear surface 3 and the cross beams 5, 5 at positions outside the left and right sides of the main beams 4, 4 of the cargo box 1. It sticks to the shape.

Specifically, the lower surfaces 5a, 5 of the two adjacent cross beams 5, 5
The protrusions 25, 25 that abut on the mounting plates 20, 2
1 and fixed to the cross beams 5, 5 by welding,
The connecting plate portion 23 is brought into contact with the back surface 3 and fixed by welding. Furthermore, in the specific example shown in FIGS. 2 and 3, the female member 18 abuts against the outer surface 10 of the main girder 4 and is fixed by welding 26, eventually
It is fitted and fixed to the corner 27 formed by the main beam 4, the cross beams 5, 5, and the back surface 3 (fifth).

The main girder 4 is not machined with holes at all, and the female member 18
A hole 19 is formed in the hole 19, and the pivot shaft 16 is inserted through the hole 19 from the left and right sides. At this time, the pin hinge bracket 12 protruding upward from the rear end of the chassis side is fitted into the lower opening recess 22 of the female member 18, and the hinge bracket 12
The pivot shaft 16 is inserted through the hole 17 of the female member 18 and the holes 19, 19 of the female member 18 so that their respective axes coincide,
The retainer 28 prevents the load box 1 from coming off in the left and right outward directions, and the rear part of the cargo box 1 is pivotally connected to the chassis side so as to be tiltable rearward. Next, as in another embodiment shown in FIG. To,
It is also preferable to fix it by welding or the like. At this time, the chassis side crossbeam 9 is further extended laterally and outwardly, and becomes elongated.
According to the embodiment of the present invention, the female member 18 can be integrated with the connecting plate part 23 such as the left and right mounting plate parts 20, 21 in advance by welding or the like, so it is not only easy to manufacture but also easy to carry. box 1
The fixing work to the back side 3 can be done very easily and quickly.

Furthermore, since the female member 18 has a downward opening recess 22, even if the support shaft 16 is damaged, the hinge bracket
2 remains protruded into the recess 22 to prevent the cargo box 1 from falling off during tilting and causing a serious accident resulting in injury or death. Furthermore, as shown in FIGS. 2 and 3, if the female member 18 is fitted and fixed to the back surface 3 of the cargo box 1 and the front and rear cross beams 5, 5 adjacent to the main beam 4, the rear pivot device 8 The strength and rigidity of the vicinity can be significantly improved. Further, since there is no need for drilling or the like in the main girder 4, the work for attaching the rear pivot device 8 can be carried out even more quickly. It is also preferable to interpose a sub-frame between the chassis frame 6 and the main girder 4 (such a case is naturally within the technical scope of the present invention), but in the illustrated embodiment, the sub-frame is Since the frame was omitted, the ground clearance of the deck board 2 could be reduced, and running stability such as cornering could be significantly improved. Further, the cross beam 9 has a rectangular tubular shape, has high strength and rigidity, and stably supports the rear part of the cargo box 1. Also female member 1
8, the external force is widely distributed and transmitted to the back surface 3, main girder 4, and cross beam of the packing box 1, which effectively prevents weld cracks caused by stress concentration, and prevents local permanent deformation of the packing box 1. can also be effectively prevented. Although not shown, when fixing the female member 18 to at least the back surface 3 and the crossbeam 5 of the packing box 1, it is also possible to use fixing devices such as bolts and rivets in addition to welding.

The present invention has been constructed as described in detail above, and has effectively achieved its intended purpose.

Since the inner and outer mounting plate parts 20 and 21 and the connecting plate part 23 are integrated to form the female member 18, the female member 18 is mass-produced in advance and no machining is performed on the back side of the packing box 1. Fixing work can be carried out easily and efficiently. Moreover,
Since the female member 18 is fixed at a desired position on the left and right outer sides of the main girders 4, 4 without necessarily needing to be connected to the main girders 4, 4, the left and right hinge brackets 12, 12 It becomes possible to take a sufficiently large gap, so that the cargo box 1 loaded with earth and sand can be supported in a stable position, as if the legs were spread apart. Furthermore, when looking at the cargo box 1 side, since the distance between the pair of left and right female members 18, 18 is sufficiently large, the torsional rigidity and lateral vibration resistance of the cargo box 1 can be significantly improved. Therefore, it is possible to effectively prevent dump truck rollover accidents even when the cargo box is tilted on rough ground. Furthermore, the female member 18 is no longer directly related to the main girder 4, and the pivot shaft 16 can be sufficiently approached to the deck plate 2, lowering the ground clearance of the deck plate 2 and lowering the ground clearance of the center of gravity of the loaded object. , driving stability during cornering, and lateral stability when tilting the cargo box were also improved.

In addition, the weight of the loaded object is transmitted from the deck plate 2 and the crossbeam 5 to the connecting plate part 23 and the inner and outer mounting plate parts 20 and 21, thereby achieving an ideal distributed transmission that avoids stress concentration and prevents cracks and damage. We were able to prevent the target from being compromised. In addition, since the pivot shaft 16 was able to come close enough to the deck plate 2, sufficient ground clearance was secured, and the ground height H of the rear lower edge of the cargo box at the maximum tilting of the cargo box 1 was as shown in FIG. It is easy to make the container large enough to improve the performance of discharging the loaded material.

[Brief explanation of drawings]

Fig. 1 is a side view showing an embodiment of the present invention, Fig. 2 is a sectional rear view, Fig. 3 is an enlarged view of the main part, Fig. 4 is an enlarged perspective view of the main part, and Fig. 5 is a cargo box. FIG. 6 is a perspective view shown upside down, and FIG. 6 is a cross-sectional rear view showing another embodiment. 1... Packing box, 3... Back side, 4... Main girder, 5...
Cross beam, 8... Rear pivot device, 12... Hinge bracket, 16... Pivot shaft, 17, 19... Hole, 18
...Female member, 20, 21...Mounting plate part, 22...
Lower opening recess, 23...connecting plate part.

Claims (1)

[Claims] 1. Inner and outer mounting plate parts 20 and 21 having holes 19 in the left and right horizontal directions and arranged in parallel at a predetermined interval, and a lower opening recess 22 by bridging the left and right inner and outer mounting plate parts 20 and 21. The female member 18 is formed by integrating the connecting plate portion 23 that forms a , the hinge bracket 12 fixed in abutting manner and protruding upward from the rear end on the chassis side is fitted into the downward opening recess 22, and the hole 17 of the hinge bracket 12 and the inner and outer mounting plate parts 20,
21. A rear pivot device for a cargo box, characterized in that the pivot shaft 16 is inserted through the holes 19, 19 in the form of a skewer.