JPS5832071B2 - Freight car body structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a truck body structure having a cargo box.

Conventionally, in the body structure of a freight vehicle having a cabin section and a cargo box, a chassis frame is generally provided, which is composed of a longitudinal member extending in the longitudinal direction of the vehicle and a transverse member extending in the vehicle width direction. The structure is such that the cabin is attached to the front and the cargo box is attached to the rear.

However, when setting up a pan-shaped vehicle and a vehicle with various loading boxes in the same vehicle series, the cabin part should be standardized as a monocoque structure, and in the case of a freight vehicle with a loading box, it should be integrated with the cabin part. A structure is adopted in which various loading platforms are mounted on a formed frame.

However, in the above-mentioned vehicle body structure, the cabin part and the cargo box mounting frame are integrated, so when painting the cabin part and installing various supplementary items, etc., the cabin part and frame are half-formed. When transporting products inside and outside the factory, transport efficiency, work efficiency, etc. are low, causing problems in terms of productivity.

In other words, there is a lot of division of labor in the automobile manufacturing sector, where the cabin and frame are assembled in a separate factory, transported by truck to a paint shop, and after painting, various accessories, cargo boxes, etc. are mounted on the body. When adopting a manufacturing system in which transport is carried out to the bodywork line, the most important issue in terms of improving productivity is to improve the transport efficiency between each process. However, transporting them in an irregularly shaped and elongated state with an integrated structure has the disadvantage that the transport efficiency, that is, the amount that can be transported by one truck is small, and the processing efficiency is significantly reduced.

Furthermore, even if conveyance efficiency is improved through an integrated manufacturing system without relying on the above-mentioned division of labor system, if the cabin and frame are made into an integral structure, the pitch on the painting line will become longer during the painting process, reducing painting efficiency. In addition, especially when the cabin part and frame part are painted in different colors, the painting efficiency is reduced due to the complexity of the painting work due to partial painting, which is not improved, and the overall length is very long. A production line is required.

Furthermore, even within the same car model series, freight vehicles
There are various types of loading boxes, such as long ones and short ones, ones for light loads or heavy loads, and high-floor or low-floor types, and the frames are designed in various ways according to these.
Moreover, the quantity and type of various supplementary materials differ, and production management in high-mix, low-volume production is extremely complicated, and the manufacturing line is also complicated, which is a major obstacle in improving productivity.

In view of this, the present invention is a freight vehicle having a cargo box, in which the cabin part and the frame are separated and formed into separate structures, and both are integrated in the assembly process, so that the cabin part is a monocoque structure. The rear end of the floor side member, which is welded and fixed to the floor panel of the cabin section, protrudes rearward at the rear of the cabin section, and the front end of the frame for attaching the loading box located at the rear of the cabin section. The present invention provides a truck body structure in which the part is fixed to the rear end of the floor side member of the cabin part by a fastening member, and improves productivity by improving conveyance efficiency, painting efficiency, etc., and improves shape, structure, etc. By selectively connecting many types of frames with different shapes to the cabin part, multi-species production can be effectively coped with, the above-mentioned conventional drawbacks can be solved, and the cabin part and the frame can be constructed separately. The purpose is to provide an effective coupling structure between the frame and the frame.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a freight vehicle according to the present invention, in which 1 is a cabin section at the front of the vehicle, and 2 is a cargo box (not shown) at the top.
This is a frame for mounting a cargo box on which a vehicle is mounted.

As shown in FIG. 2, the cabin section 1 includes a front panel 3, a roof panel 4, both side panels 5, 5, a rear panel 6, a floor panel 7, and floor side members welded to both sides of the lower surface of the floor panel 7. 8, 8 to form a monocoque structure.

The floor side member 8° 8 is formed at the rear of the cabin portion 1, with a rear end portion 8a protruding rearward from the rear panel 6.

As shown in FIGS. 3 to 6, this floor side member 8 is configured to be joined to the floor panel 7 or sub-members 9 and 10 in the front-rear direction of the cabin portion 1 to form a closed-section structure. has been done.

Note that 11 is a side door, and 12 is a service hole opened in the floor panel 7.

On the other hand, the frame 2 has vertical members 13 on both sides and cross members 14 in the horizontal direction.
There are various types as shown in FIGS. 7 to 10 as examples.

FIG. 7 shows a long frame for two people and is for a long cargo box, and FIG. 8 shows a frame 2B for average legs and is for a standard length cargo box.

In both frames 2A and 2B, the length and vehicle width of the cross members 14 and 14 are almost constant, but the lengths of the vertical members 13 and 13 are different, and various supplementary items and brackets for holding the spare tire are used. The arrangement positions of 15 are different.

Moreover, FIG. 9 shows a frame 2C for light loads, with vertical members 1
3 has a channel-shaped open cross section, whereas FIG. 10 shows a heavy load frame 2D in which the vertical members 13 are constructed with a closed cross section to improve strength.

After the cabin portion 1 is formed into the structure described above, a predetermined coating is applied in a coating process.

On the other hand, a predetermined frame 2 of a predetermined shape and size, that is, for a long frame, for a medium-sized frame, for a light load, or for a heavy load, is prepared, and in the assembly process, a frame 2 is prepared for the floor side member 8 of the cabin section 1. The end portion 8a and the front end portion 2a of the vertical member 13 of the frame 2 arranged at the rear of the cabin portion 1 are connected by a fastening member.

11 to 16 show a stress relaxation structure in the connection between the rear end 8a of the floor side member 8 and the front end 2a of the frame 2. FIG.

Figures 11 and 12 show the connection with a closed section;
Figure 1 shows the top surface of frame 2 and floor side member 8.
12 shows a structure in which the lower surfaces of the frames 2 are extended and overlapped, and are joined together at an inclined surface. FIG. 12 shows a structure in which the upper surfaces of the frames 2 are extended and overlapped and joined together.

13 to 16 show the connection of a closed cross section and an open cross section, and in FIG. 13, a notch 16 is formed in the floor side member 8, and the tip of the frame 2 is inserted into the floor side member 8 and connected. It is a structure.

FIG. 14 shows a structure in which the tip of the frame 2, on which a reinforcing member 17 is fixed and a closed cross section is formed, is inserted into the floor side member 8 and joined. In this case, as shown in FIG. is interposed.

Furthermore, FIG. 16 shows a structure in which the floor side member 8 and the frame 2 are connected by using a connecting member 19 spanning over them.

The floor side frames 8 and the frames 2 formed in the various types of connection structures described above are connected by fastening members (not shown) such as bolts, nuts, or rivets.

Next, after the cabin portion 1 and the frame 2 are fixed and integrated as described above, a cargo box is mounted on the upper part of the frame 2.

Therefore, according to the vehicle body structure of the freight vehicle of the present invention as described above, the cabin section has a monocoque structure, and the floor side members welded and fixed to the floor panel protrude toward the rear of the cabin. By fixing the front end of the cargo box mounting frame to the rear end of the floor side member of the cabin section, the cabin section can be transported and painted without the frame being fixed, which improves transport and painting efficiency. It is possible to improve productivity and shorten the painting line.

In addition, the floor side members of the cabin part protrude rearward at the rear of the cabin part and are fixed to the front end of the frame by fastening members, making it easy to assemble the cabin part and frame, and a stress concentration alleviation structure is adopted. It has the advantage of being easy to use, and its structure has no problems in terms of strength.

Furthermore, by preparing a variety of frames for long lengths, flat feet, light loads, or heavy loads, and selectively combining them with the cabin depending on the purpose (vehicle type), it is possible to standardize and share the cabin. This makes it possible to effectively handle multi-product production and significantly improve productivity.

[Brief explanation of the drawing]

The drawings illustrate embodiments of the present invention; FIG. 1 is a perspective view showing the cabin section and frame before assembly, FIG. 2 is a perspective view of the cabin section as seen diagonally from below, and FIG. 3 shows the floor of the cabin section. A side view showing the side member, Figure 4 is A- in Figure 3.
A sectional view, Fig. 5 is a C-C sectional view, and Fig. 6 is a C-C sectional view.
7 is a plan view showing the frame for long lengths, FIG. 8 is a plan view showing the frame for average feet, FIG. 9 is a perspective view of main parts showing the frame for light loads, and FIG. 10 is for heavy loads. FIGS. 11 to 16 are perspective views of main parts showing the frame, and FIGS.
2 is a perspective view showing the other side, FIG. 13 is a perspective view showing an example of a coupling structure between a closed section and an open section, FIG. 14 is a perspective view showing another example, and FIG. A sectional view taken along line DD in the figure and FIG. 16 are perspective views showing still another example. 1...cabin part, 2...frame,
2a...Front end, 6...Rear panel,
7... Floor panel, 8... Floor side member 8a... Rear end, 9.10...
...Sub member, 13... Vertical member, 14.
...Horizontal material, 15...Bracket, 16.
...Notch, 17... Reinforcement member, 18.
...Spacer, 19...Connection member.

Claims (1)

[Claims] 1. The cabin section of a freight vehicle having a loading box is formed in a monocoque structure, and the rear end of a floor side member welded and fixed to the floor panel of the cabin section protrudes rearward at the rear of the cabin section, and the cabin section A vehicle body structure for a truck, characterized in that a front end portion of a frame for attaching a cargo box located at the rear is fixed to a rear end portion of a floor side member of the cabin portion by a fastening member.