JPS6229260B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a subframe for a container loading/unloading vehicle.

Conventionally, the subframe of container loading and unloading vehicles was
For example, as shown in Figures 9 and 8, the longitudinal girder a
Since the first half member b had a U-shaped cross section with an opening on the inside, and the second half member c had a U-shaped cross section with an opening on the outside, the welded joint A of both members b and c
At this time, the neutral plane B suddenly became curved from the outside to the inside, and an unreasonable force was applied near the connecting portion A, causing permanent deformation (curving) of the member and cracks in the weld. In addition, in the case of a structure in which the fluid pressure cylinder is attached to the center of the crossbeam d, since the first half member b has a U-shaped cross section with an opening on the inside, the distance between the support parts at both ends of the crossbeam d becomes large, and the As shown in the bending moment diagram in Figure 8, the maximum bending moment was large, and there was a drawback that unreasonable stress was generated on the crossbeam d.

The present invention solves these conventional problems, and eliminates permanent deformation and weld cracks in the welded joints of the longitudinal girders even when large tensile or compressive forces are applied to the subframe, and allows fluid cylinders to be mounted easily. To provide a lightweight and robust subframe capable of reducing weight without generating large stress on cross beams, and also capable of surely supporting the weight of a container. Therefore, a feature of the present invention is that the cross-sectional shapes of the basic members of the second half member and the first half member are approximately U-shaped, and the webs of the basic members are overlapped and welded together so that they are back-to-back with each other. The second half member of the longitudinal girder is installed inside the first half member when viewed from above, and the container guiding roller pivotally connected to the second half member is placed on the rearward extension of the first half member. At the same time, the upper part of the basic member of the first half member, which has a substantially U-shaped cross section and an opening outward from the side, has a reinforcing bent piece with its outer edge bent downward. the longitudinal beam is mounted on the chassis frame so that the first half member of the longitudinal beam corresponds to the upper part of the chassis frame; A gusset is provided to connect the upper piece and the lower piece, and the gusset is integrally fixed to the front half member, and the upper end of the connecting bolt for connecting to the chassis frame is connected directly or directly to the gusset. The reason lies in the fact that it is indirectly fixed.

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

FIG. 1 and FIG. 2 show the container loading (unloading) state and container dumping state of the container loading/unloading vehicle 1, respectively. 2 is a container, 3 is a chassis, 4 is a chassis frame, and 5 is a subframe mounted on the chassis frame 4. Reference numeral 6 denotes a lifting arm for the container 2, which includes a base member 8 pivotally connected to the rear end of the subframe 5 via a support shaft 7, and an L-shaped arm pivotally connected to the tip of the base member 8 via a shaft 9. The operations shown in FIG. 2 and FIG. 1 can be selected by engaging and disengaging a locking/disengaging mechanism 11, which is composed of a mold tip member 10 and the like and is attached between the bottom surface of the container 2 and the base member 8. It is. 1
Reference numeral 2 denotes a hydraulic cylinder, and as shown in FIGS. 1, 2, and 3, a pair of cylinders 12 are pivotally connected to a crossbeam 13 at the front end of the subframe 5 by a shaft 14, The other end is pivotally connected to the tip member 10 of the lifting arm 6 through a shaft 15, and pushes up the lifting arm 6 in a so-called direct impact type. When the container 2 begins to tilt as shown by the imaginary line in FIG. A large reaction force E acts on the crossbeam 13 (Fig. 3). Alternatively, in FIG. 1, when the container 2 is located close to the ground 16, a large tensile force acts on the cylinder 12, and a force in the opposite direction to the arrow E in FIG. 3 acts on the crossbeam 13. It happens.

3 to 7, the subframe 5 includes a pair of left and right longitudinal girders 17, 17, and the longitudinal girder 1.
It is composed of the horizontal beam 13, which connects the front end portions of the longitudinal beams 17, 17 in a left and right bridging manner, and the support shaft 7, etc., which connects the rear end portions of the vertical beams 17, 17 in a left and right bridging manner,
Moreover, the left and right ends of this support shaft 7 are connected to the longitudinal girders 17 and 1.
Container guiding rollers 18, 18 are rotatably pivoted to project outwardly from 7. The rollers 18, 18 are connected to the main girder 1 at the bottom of the container 2.
9 and 19 come into contact with each other in a placed manner and are guided as shown in FIG. 1 to carry out loading and unloading.

Thus, the vertical beam 17 includes a rear half member 20 to which the support shaft 7 is attached, and a front half member 2 to which the cross beam 13 is attached.
Consists of 1. The cross-sectional shapes of the basic members 20a and 21a of the second half member 20 and the first half member 21 are approximately U-shaped (channel-shaped), and the basic members 20
The webs 22 and 23 of a and 21a are overlapped and welded together over a predetermined length so as to be back to back to each other. At this time, if the front end of the second half member 20 is sloped, the rear end of the first half member 21 is also sloped, and the sloped front and rear ends are welded,
There is no sudden change in cross-sectional area along the longitudinal direction, stress concentration can be avoided, and fatigue failure of the welded part can be effectively prevented. Moreover, if plug welding 24 is performed as shown in FIG. 5, the webs 22 and 23 will be more securely attached to each other.

When viewed from above, the longitudinal girder 17 is the latter half member 20
The roller 18 is disposed inside the first half member 21 and is pivotally connected to the second half member 20 by the support shaft 7, and is located on the rearward extension of the first half member 21. When the container 2 is loaded onto the automobile 1 and driven, the main girder 19 of the container 2 is placed on the front half member 21 of the subframe 5. The girder 19 reliably contacts the roller 18,
The rollers 18 are guided back and forth while rolling.

Therefore, if the web 22 of the basic member 20a of the second half member 20 and the web 23 of the basic member 21a of the first half member 21 are overlapped back to back as described above, it is natural that the basic member 21a of the first half member 21
This basic member 21 has an opening shape outwardly.
The upper piece part 25a of a has a reinforcing bent piece part 26 whose side outer edge is bent downward. Moreover, a plurality of gussets 27 are provided at predetermined intervals in the longitudinal direction of this basic member 21a. That is, specifically, by inserting the gusset 27, which is a plate member having a U-shaped planar shape, from the end of the basic member 21a, feeding it in the longitudinal direction, and fixing it integrally by welding. , serves as reinforcement to reliably prevent the upper piece 25 from deforming downward when the weight of the container 2 is applied, and as is clear from FIGS. 5 and 6,
External force due to the weight of the container is transmitted to the web 4a of the chassis frame 4 in the lower position. Further, reference numeral 28 denotes a connecting bolt that connects the subframe 5 and the chassis frame 4, and this bolt 28 is welded to the gusset 27 with a spacer plate 29 interposed therebetween.

As long as the basic member 20a is approximately U-shaped, the latter half member 20 may be partially formed into a box-shaped cross section by adding a reinforcing plate or the like.

〔Effect of the invention〕

The present invention achieves the following remarkable effects with the above-described configuration.

The basic member 21a of the front half member 21 is the web 23
is on the inside, the neutral plane B of the basic member 21a is on the inside, as shown in FIG.
The bending moment diagram when the reaction force E of the cylinder 12 (see Fig. 3) acts on the central part of the crossbeam 13 is smaller than that shown in Fig. 8 of the conventional example, and the maximum moment can be reduced. This is advantageous in terms of strength and allows for weight reduction.

The web 22 and the web 23 are superimposed back to back and welded together to form the longitudinal girder 17.
As shown in the plan view of Fig. 4, the neutral plane B changes linearly and smoothly, and the welded joint A
There is no need to put too much strain on it.

In other words, the tensile force or compressive force of the longitudinal beam 17 due to the thrust force E of the cylinder 12 is smoothly transmitted between the rear half member 20 and the front half member 21.

Therefore, it is possible to prevent permanent deformation of the longitudinal girder, cracks in welding, etc. in the conventional structure shown in FIG. 9, and it is also possible to simplify and reduce the weight of the structure.

The first half member 21 of the longitudinal girder 17 is the chassis frame 4
, the downward external force (load) acting on the front half member 21 is immediately received by the chassis frame 4, which is advantageous in terms of strength.

Since the gussets 27 are provided inside the first half member 21, the downward external force (load) can be supported more reliably. That is, it is possible to prevent the upper piece portion 25 from deforming downward.

Since the front half member 21 is open laterally and outwardly,
The gusset 27 can be inserted from the rear end of the front half member 21 and easily sent to a predetermined position in the front.

Although the outer surface of the front half member 21 is U-shaped with an outward opening, the upper end of the connecting bolt 28 can be fixed to the gusset 27 directly or indirectly through the spacer 29, and it can be firmly secured. The longitudinal girder front half member 21 can be connected and integrated with the chassis frame 4.

[Brief explanation of the drawing]

Fig. 1 is a side view showing one embodiment of the present invention and illustrating the loading/unloading state of the container, Fig. 2 is a side view showing the container in a tilting dump state, Fig. 3 is a plan view of the main part, Fig. 4 is an enlarged plan view of the main part, Fig. 5 is a perspective view of the main part, and Figs. 6 and 7 are respectively F- of Fig. 5.
F, GG sectional views, FIG. 8 is a comparison diagram of the bending moment acting on the cross beam, and FIG. 9 is a plan view showing a conventional example. 5...Subframe, 17...Vertical girder, 18...
roller, 20... second half member, 21... first half member,
20a, 21a... basic member, 22, 23... web, 25... upper piece part, 26... reinforcing bent piece part.

Claims (1)

[Claims] 1. The cross-sectional shapes of the basic members 20a, 21a of the rear half member 20 and the front half member 21 are approximately U-shaped, and the webs 22 and 23 of the basic members 20a, 21a are overlapped and welded together so that they are back to back. The second half member 20 of the longitudinal girder 17 is disposed inside the first half member 21 when viewed from above, and the container guiding rollers 18 pivotally connected to the second half member 20 are attached to the first half member 21. The upper piece 25 of the basic member 21a of the front half member 21 is arranged to extend rearward of the member 21, and has a substantially U-shaped cross section and an opening outward from the side. It has a reinforcing bent piece portion 26 bent downward, and the longitudinal girder 1
The vertical beam 17 is placed on the chassis frame 4 so that the front half member 21 of the frame 7 corresponds to the upper part of the chassis frame 4.
Furthermore, a gusset 27 for connecting the upper piece 25 and the lower piece is provided inside the front half member 21 which is open outward from the side, and the gusset 27 is integrally attached to the front half member 21. A connecting bolt 28 for fixing and connecting to the chassis frame 4
A subframe for a container loading/unloading vehicle, characterized in that the upper end of the subframe is fixed directly or indirectly to the gusset 27.