JPS6025290B2 - Dump body rear pivot device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a rear pin support device for a dump body.

In conventional dump trucks, the rear pivot device that allows the dump body to move rearward and pivots to the chassis side uses a plate-shaped hinge bracket with only the body main girder fixed by welding, which prevents excessive loading. The weight of the object acted intensively on this welded area, causing cracking and local buckling of the main girder.

Furthermore, the width of the pair of left and right main girders installed on the back of the deck board is quite small compared to the width of the entire body, so if torsion is applied, such as when dumping on rough terrain, the rear of the body If the body was supported at this width dimension, permanent torsional deformation occurred in the body. The present invention has been made in view of these points, and aims to (1) improve the strength of the rear pivot portion of the body, and (2) improve the torsional strength and rigidity of the body.

Hereinafter, the present invention will be explained in detail based on illustrated embodiments.

In Figures 1 to 5, 1 is a body for loading earth and sand, etc., and is shaped like a box with an upward opening, with a front wall, side walls, a rear door (not shown), and a deck plate 2 forming a floor. A pair of left and right main girders 4, 4 are vertically fixed to the back surface 3 of the deck board 2, and a number of cross beams 5 are integrally fixed to the horizontal direction by welding. A concrete example shows the case of a cross-shaped structure.

Reference numeral 6 denotes a chassis frame, and a subframe 7 is mounted on the chassis frame 6, and the main girder 4 of the body 1 is repositioned via supports 8 when the vehicle is running.

Reference numeral 9 denotes a rear pivot device that supports the body 1 so that its forehead can freely move rearward as shown in the imaginary line in FIG. The crossbeam 1 extends so as to protrude outward from the outer surface of the crossbeam 1.
It projects laterally outward from the outer surface 11 of the main girder 4 of the Kawama body.

Reference numeral 12 denotes a hinge bracket, which is attached to project upward from the crossbeam 10 in the left and right outward directions relative to the outer surface 11 of the main beam 4. That is, the hinge bracket 12 is provided not on the body side but on the chassis side, and specifically, it is an inverted L-shaped backing plate that supports the rear surface 10a and top surface 10b of the cross beam 10, which has a rectangular or square cross section. 13, and two parallel side plates 14, 1 erected from the corresponding plate part 13.
4, and a connecting side plate 14 to connect the left and right side plates 14, 14.
, 14, and a cylindrical boss portion 15 fixed to the upper end portion of 2.
The hinge bracket 12 is composed of two reinforcing plates 16, 16, and this reinforcing plate 16 is made of a rectangular plate material, and its upper side is connected to the boss part 15, its left and right sides are connected to the side plates 14, 14, and its lower side is connected to the backing plate part 13. The entire hinge bracket 12 is box-shaped and has extremely high rigidity. The boss portion 15 is also provided with a hole portion 18 through which a spinal cord 17 (described later) is inserted. Reference numeral 19 denotes a receiving member, which is disposed at a corner S formed by the outer surface 11 of the main body girder 4, the cross beam 5, and the back surface 3 of the deck board 2, as shown in FIG. , is integrally fixed to the main girder 4, machine girder 5, and deck plate 2 by welding.

Specifically, as shown in FIGS. 3 and 4, the receiving member 19 is bent and formed so as to support the back surface 3 of the deck board 2 and abut a part of the crossbeam 5. The abutting slope portion 20 and the abutting plate portion 20 are attached to the outer surface 11 of the main girder 4.
The inner mounting plate part 21 is parallel to the inner mounting slope part 21 and is disposed at a predetermined interval on the outside, and the outer mounting plate part 22 is in contact with the inner mounting slope part 21. The backing plate portion 20 and the mounting plate portions 21 and 22 are integrally welded in advance. Furthermore, the outer mounting plate portion 22 has a cylindrical boss portion 2.
3 is provided, and the inner mounting plate portion 21 is provided with another cylindrical boss portion 2.
4 is provided, and the latter boss portion 24 is attached to the outer surface 11 of the main girder 4.
The boss portion 24 is inserted into a hole 25 provided in the main girder 4 and is integrally welded to the inner surface of the main girder 4 via an annular backing plate 26. The outer mounting plate part 22 is integrally welded to the crossbeam 5 and the back surface 3 via the backing plate part 20, and the inner mounting plate part 21 is directly attached to the outer surface 11 of the main girder 4 and the backing plate part 20. It is integrally welded to the crossbeam 5 and the back surface 3 via.

The hinge bracket 12 described above is fitted between the mounting plate parts 21 and 22 of the receiving member 19 integrally fixed to the corner S by welding, and the hinge bracket 12 and both mounting slope parts 21 are inserted. , 22 and the outer surface 11 of the main girder 4 are shaped like skewers, and the pine support shaft 17 is inserted from the inside to the outside to pivotally connect the body 1 and the subframe 7.

That is, the boss part 15 of the hinge bracket 12 is inserted into the recessed part 27 in the shape of a lower entrance formed by both the mounting plates 21 and 22 and the backing plate part 20, and the hole part 28 of each of the boss parts 23 and 24 is inserted. , 29 and the center of the hole 18 of the boss portion 15 are aligned with each other, and the pivot shaft 17 is inserted therethrough.

Since the receiving members 19, 19 are disposed on the left and right outer sides of the main girders 4, 4 in this way, the mutual interval dimension W of both receiving portion villages 19, 19 is sufficiently larger than the width dimension of the left and right main girders 4, 4. It can be made large, and the rear part of the body 1 can be supported with a large interval W as if the legs were opened as shown in FIG.

Furthermore, since the pole support shaft 17 is inserted through the main girder 4 itself,
The height dimension from the upper surface of the subframe 7 to the deck board 2 can be minimized. It should be noted that the present invention is not limited to the above-mentioned embodiments, and is of course open to various design changes.
The receiving member 19 consisting of the backing plate portion 20, both mounting slope portions 21, 22, etc. may be integrally formed by forging or casting.

Furthermore, the main girder 4 and the cross beam 5 may not have a double cross structure, but may have a structure in which the cross beam 5 is cut at the main girder 4. It is also possible to arrange the receiving member 19 not at the rear corner S of the crossbeam 5 but at the front corner. Also Ukebe Village 19
When fixing to the corner S, it is preferable to use a fixing tool such as a bolt or a pet in addition to welding. [Effects of the Invention] As described above, the present invention includes the slope part 20 that is in contact with the back surface 3 of the deck board 2 of the body 1 and a part of the girder 5, and the main body girder 4.
A receiving member 19 having an inner mounting slope portion 21 supporting the outer surface 11 of the main body girder 4 and an outer mounting plate portion 22 disposed parallel to the inner mounting plate portion 21 at a predetermined interval is attached to the receiving member 19. The hinge bracket 12, which is integrally fixed by welding to the corner S formed by the outer surface 11, the cross beam 5, and the back surface 3, and which projects upward from the rear end of the chassis, is attached to the receiving member 19. The hinge bracket 12, both the mounting plate parts 21, 22, and the outer surface 1
1 is shaped like a skewer, and the pivot koji 17 is inserted through it, so that the following significant effects can be obtained.

■ The weight of the loaded object is calculated from the deck plate 2 and crossbeam 5 to the backing plate part 2.
0' is transmitted, and is further transmitted to the inner and outer mounting plate parts 21 and 22, and is also transmitted from the nominative 4 to the inner mounting slope part 21, so that stress concentration can be effectively avoided and ideal distributed transmission of force can be achieved. , it was possible to effectively prevent crack damage and permanent deformation such as local buckling.

- The receiving member 19 is fixed to the outer surface 11 of the main girder 4, and the mutual distance W between the left and right receiving members 19, 19 can be made large, so that the body 1 is supported with the legs spread apart,
By increasing the torsional strength and torsional rigidity of the body, the lateral stability has been significantly improved even when dumping on rough terrain.

This is particularly suitable for the largest body.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a partially sectional side view, FIG. 2 is a partially sectional rear view, FIG. 3 is a detailed rear view, and FIG. 4 is a detailed side view. FIG. 5 is a perspective view showing the body turned over. 1...Body, 2...Deck board, 3...
・Back side, 4...Main girder, 5...Horizontal girder, 1
1... Outer surface, 12... Hinge bracket, 1
7... Pivot shaft, 19... Receiving member, 20...
・・・・Backing plate part, 21...Inner mounting plate part, 22・
...External mounting plate, S...corner. Figure 1 Figure N Boat map Mountain boat Figure 3 Figure 4

Claims (1)

[Claims] 1 A backing plate part 20 that comes into contact with the back surface 3 of the deck plate 2 of the body 1 and a part of the cross beam 5, an inner mounting plate part 21 that comes into contact with the outer surface 11 of the main body girder 4, and the inner mounting plate part 21 A receiving member 19 having external mounting plate portions 22 disposed parallel to and at a predetermined interval is attached to a corner formed by the outer surface 11 of the main body girder 4, the cross beam 5, and the back surface 3. A hinge bracket 12 integrally fixed to the part S by welding and projecting upward from the rear end on the chassis side is fitted between both mounting plate parts 21 and 22 of the receiving member 19, and the hinge bracket 12 and A rear pivot device for a dump body, characterized in that both mounting plate portions 21, 22 and the outer surface 11 are shaped like a skewer, and a pivot shaft 17 is inserted therethrough.