JPS6076477A - Vehicle body frame structure - Google Patents

Abstract

PURPOSE:To make it possible to use press-dies and a welding jig commonly for fabricating the outer and inner panels of side frames to reduce the manufacturing cost of the side frame, by forming both outer and inner panels such that panels having the identical cross-section and the identical shape are superposed together and then joined, to form a box-like cross-sectioned shape. CONSTITUTION:Of two front and rear split sections of side frame 10, the outer panel 16 and inner panel 18 of the front split section are formed with the use of press-dies 50, 52. Further, the outer panel 17 and inner panel 19 of another side frame 11 are also formed with the use of the press-dies 50, 52, and are joined together similarly to the outer and inner panels 16, 18 so that the so-called split frame section in a half-size of the side frame 11 is obtained. These frames 50, 52 may be commonly used for fabricating side frames 10, 11 of both long and short lengths.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to a vehicle body frame structure for automatic racks such as trucks.

b. Prior art A typical example of a conventional vehicle body frame structure is shown in FIG.

Such a structure is described, for example, in Volume 1 of Jidoto Kogaku Zensho, ``Vehicle Structure of Trucks and Buses'' (Sankaido Edition), pages 27 to 30. In the figure, a pair of left and right side frames, which are the main longitudinal strength members of the vehicle body, consist of a Go-shaped outer panel Z made of thick-walled steel plate and an inner panel Z made of thin-walled steel plate. Then weld the overlapping ends. Vertical section box shape ≦
It is configured such that the main body is formed to extend in the longitudinal direction of the heavy body.

Then, channel-shaped inner places are installed at appropriate locations across the box-shaped cross-section and across both the outer and inner panels 2, 4t. A plurality of cross members (not shown) are installed between the pair of left and right side frames to form a so-called ladder-like frame structure.

Both the outer and inner Banelco of this side frame/
To explain the manufacturing method for trucks, in response to customer requests, there are two types of trucks: long size trucks with a long overall length and short size trucks with a short overall length. As shown in Figure 1, the frame structure for short products consists of a short integrally molded right outer panel (A) and a short integrally molded outer panel (A). A short right side frame is manufactured by welding and joining the right side inner panel (e), which has been made in one piece, and the short left side frame is made up of a short one-piece left outer panel (b) and a short one-piece left inner panel (e). It is manufactured by welding and joining.

On the other hand, the long right side frame is manufactured by welding together the long integrally molded right outer panel (C) and the long integrally molded right inner panel (G). is manufactured by welding (d) and (ch) together.

In other words, corresponding to each short and long frame, the outer panels (A), (B), (C), and (=) are made of steel plates that are integrally press-formed, and the inner panels are also (E).
, (F), ()), and (C) are integrally press-formed using a steel plate.

Therefore, a total of y press dies are required for each of the long and short side frame structures, and the press dies are cumbersome and expensive.

Both the outer and inner panels of the integral bracelet product 2. In order to make a strong welding connection, welding jigs must be made to match the lengths of both panels. W. The 5N structure has serious problems in that it is long, prone to welding distortion (especially warping in the longitudinal direction) due to thermal deformation, and the work of correcting the distortion is troublesome.

On the other hand, since the side frames are each made of one piece, there arises the secondary problem of increasing inventory space and distribution costs.

Also, if we look at the inner place ♂, the main function of the inner place ♂ is a so-called jig function that determines the width dimension when the outer panel λ and the inner panel are welded together, rather than a reinforcing function. The design is such that only the outer and inner panels are sufficient, and if the reinforcing function of the inner place panels is relied upon, the design for various loads will become complicated. Therefore, an extra element called the inner place t is added to the frame structure, resulting in a structure that is problematic in terms of manufacturing cost and weight.

Furthermore, when changing the wheel pace of a vehicle, since it is a one-piece product, everything including the press mold and jig must be changed, making it extremely difficult to respond to wheel pace changes in terms of manufacturing. .

C0 Purpose This invention was made in view of such conventional problems.
Significantly reduce press type and jig type for long and short items.
Good manufacturability, reduced inventory space and distribution costs,
The present invention provides a vehicle body side frame structure that has fewer unnecessary parts, has less welding distortion, and can easily respond to changes in wheel pace.

d. Structure In order to achieve the above object, the present invention divides a side frame into two parts, front and rear, and connects the divided ends with a connector to form a single side frame. The gist is that panels having the same cross section and the same shape are stacked and joined to form a box-shaped cross section.

e. In the embodiments FIGS. 3 to 5, 10. // is a pair of left and right side frames which are the main strength members in the longitudinal direction of the heavy body; each of these side frames 10. //A, 10B, /IA, //B are formed separately in the front and back, respectively, and these divided ends are joined W by a pair of left and right U-shaped connectors /J, /l, respectively, to be integrated. It has become Moreover, each side frame 10. // is an outer panel /l, /7 inner panel lza, /de of the same U-shaped cross section and flanges #a, /ga and /7a.

A box-shaped cross section 2Of is formed by overlapping the /9a pieces facing each other and joining them W2. Therefore, one side frame IO or /l is divided into front, rear, outer, and I/I parts, and is integrated by joining W, , W, respectively.

2/, ,2.2. . υ, nog, 25 is a vibrator-shaped cross member installed between both side frames, and each cross member 2/~, 2S is shown in FIG.
Both side frames 10. A 1m hole opened at //,
2A, , 27°2g, 29, and at the periphery of these through holes, 26 to 29, the cross member 2/~,
! S and joint W, O both side frames 10. Inside and outside of // and cross member 21~. 25 each has brackets, ? (7,,j
/, 3.2°,? J, ,M, 3! ;, 3t,
37 are joined in pairs on the left and right, and a driver's cab (not shown) and a loading platform (
(not shown), front suspension (not shown), engine (not shown), rear axle (not shown), rear suspension (not shown), fuel tank (not shown)
It forms the support for the powertrain, suspension parts, and equipment necessary for equal-weight vehicles.

Also, each side frame 10. //Constituting outer panel /A, /7, inner panel /g, /? Connector /J, /4? A notch 3g for receiving the central cross member n is formed at the joint end of the side frame 10. There are kick-up sections before and after //.

//l/ and ¥2, %j are formed rising.

Next, the outer panel IA, /7 and the inner panel /g, / of the side frame 10° // divided into left and right Z parts.
The manufacturing and bonding structure of No. 9 will be explained. In Figures 3 and 3, the side frame 10 is divided into front and rear parts.
Outer panel/6 and inner panel 1 according to the previous rule are shown in Figures 7 and 7, respectively! The front inner panel 16 is formed using the press die shown in Fig. 6, and the rear outer panel 16 is formed using the press die J'2 shown in Fig. 7. Join the inner panel l edges and rear outer panel/l
and the rear inner panel/g to form a so-called half-size split frame portion of the side frame 10.

Next, for the other side frame /l, the front inner panel /q and outer panel 17 are made using the opposite-hand press type shown in Figures 6 and 2, respectively! θ,! The rear outer panel 17 is formed using a press-type box shown in FIG.
The rear inner panel 19 is a press type as shown in the figure! 0, and are joined in the same manner to form a so-called half-size split frame portion of the side frame //.

This press type jθ.

! This is a long size side frame 10,
10. When molding // and side frames for short items (short size). It is also used when molding //. That is, the rear inner panel iq for long objects shown in FIG. 3(a), the rear inner panel lq for short objects shown in FIG. The rear outer panel /7 for long objects, the rear outer panel 17 for short objects, Front outer panel for both long and short lengths/7
It is something that can be molded.

That is, whether the side frame 10 is a long one or a short one.
．． Even if it is in //, the kick-up section is 4tO, 4t/.

4t3 is formed with the same inclination and height dimension (inclination θ and height H dimension in FIG. 7) from the general surface.

As is clear from the above explanation, what conventionally required r press dies for long and short lengths now requires two press dies with opposite sides! θ,! It is possible to press-form both the outer and inch panels of long and short items with just this machine.

Next f side frame 10. The // junction will be explained.

In Fig. 1O and Fig. 1/, for example, to describe the joining of the front half-size portion //A of the other side frame //, locate pins Ω and Koku are protruded at the welding jig toVC and z locations. , this locating pin consists of a cylindrical large diameter part of a predetermined length and a small diameter part 6 extending from this large diameter part with a bearing surface g/, and the large diameter part ≦ part. The predetermined length of the outer panel/7 and the inner panel/q are not positioned in two directions perpendicular to their longitudinal directions, but are positioned in the longitudinal direction by two locating pins 42, 641. That is, the web /qb of the inner panel /q has a hole /9c through which the double-ended cable pin gλ, the large diameter part t≦ of 0 is inserted, and the web /71) of the outer panel 17 has a double-ended cable pin 42 inserted therethrough. ．．
A hole /7c is formed through which the small diameter portion of . Both outer and inch panels/7. /? Flange comrade /7a, /? 0. In this set state, both the outer and inner panels/7. /de is joined Wt. This jig 10 has outer and inner panels/7. Hole to be opened on /9 /7
If the inflection points of a and /dec kick-up part g/ are set the same for long and short items, it can be used in common for two items with opposite hands. Therefore, fewer jigs are required for joining, and there is no need to make any mistakes in the small and simple structure, and there is no need to arrange an inner place as in the past, which is favorable in terms of equipment. Furthermore, the joint length is approximately half that of a single side frame, making it difficult for welding distortion (especially warpage in the longitudinal direction) due to thermal deformation to occur, improving manufacturing accuracy and drastically reducing distortion correction work. Since the frame 10. // is divided into front and rear parts 10h, 10B and //A, //B, the inventory space for the frame does not take up much space, and distribution costs are also significantly reduced.

Next, I will explain how to deal with wheelbase changes.The press mold shown in Figures 6 and 7! By making θ and Oko larger in advance, as long as the same kick-up dimensions are allowed, when changing the wheelbase,
There is no need to create a new press mold and it can be shared.

In addition, when changing the frame width such as a narrow frame shown in Fig. 12, a wide frame shown in Fig. 13, and a rear opening frame shown in Fig. This can be easily dealt with by simply changing the .

In the embodiment, vibrator-shaped cross members 2/-, 2j are used, but the present invention is not limited to this, and it is of course possible to use cross members having a square shape or a rectangular shape.

f. Effects According to the present invention, the following manufacturing and structural effects are achieved.

■ The press unit is small and press molds can be shared less frequently, which is advantageous in manufacturing.

■ Welding jigs are small and the number of jigs can be shared, reducing the need for equipment, which is advantageous in terms of equipment.

■ The welding length is short, so welding distortion is less likely to occur, and even if distortion correction is required, the work is easy.

■ It is advantageous in terms of inventory space and logistics costs.

■ Contributes to frame performance and is advantageous in terms of cost and weight since there are no unnecessary parts such as inner places.

■ Easily adapts to wheelbase changes and frame width changes.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional frame structure, Fig. 2 is an explanatory diagram showing the components of the conventional frame structure, Fig. 3 is a perspective view of a frame structure showing an example of the present invention, and Fig. A perspective view showing the joint part, No. The figure is Figure 3 v-v
6 is an explanatory diagram showing the components of one press die and the frame structure, FIG. 7 is an explanatory diagram of the other press die, and Figures ♂ and 3 are an illustration of an example of the present invention. These diagrams show a schematic view of the frame structure, with side and plan views respectively, Figure io is a perspective view showing a half-size frame set in a jig, and Figure 1 is a cross section taken along the line XI-XI in Figure 10. Figures 1 and 1 are schematic plan views of frames for showing correspondence to examples of different frame widths, respectively. 10, //...pair of left and right side frames, IOA
, 10B, //A, //B... Division forming part (half size part), /, 2. /lA...U-shaped connector,
/4. /7... Outer panel, /l, iq...
Inner panel, /Aa, /Za...Flange, /7a
, /9a-flange, /7b, /qb-...web, /
7c, /9a-...hole, 20...box-shaped cross section, 2/,
,? , 2. ．． 23.241! . , 75...Cross member, 410, ! / , (
t, 2, &j...kick-up section, 62, 4&
...locating pin, ^g... cylindrical large diameter part, g...
・Small diameter section. ;・′, ,,,:1. ,,,! 1-゛-ichi paper 1 country 2- $B gong

Claims (4)

[Claims] (1) In a vehicle body frame structure including a pair of left and right side frames and a plurality of cross members installed between the two side frames, each of the side frames is divided into front and rear pressure sections, and connectors are provided at the ends of each division. Each side frame has an outer U-shaped cross section. A vehicle body frame structure characterized by forming a box-shaped cross section by overlapping and joining both inch panels with their flanges facing each other. (2) Kick-up portions are formed at the front and rear ends of the side frame, and both kick-up portions are formed with the same inclination and height from the general surface, as claimed in claim 1. Body frame structure as described. (3) At a position where the flanges of both the outer and inner panels that face each other overlap, a hole is provided in one of the webs of both panels through which the large diameter portion of a predetermined length of the stepped locate pin is inserted. 3. The vehicle body frame structure according to claim 1, wherein the other side of the locating pin has a hole through which a small diameter portion extending from the large diameter portion of the locating pin through the seat surface is inserted. (4) A hole through which a cross member passes is formed in both the outer and inner panels facing each other, and the cross member is joined at the periphery of both the holes. Vehicle body frame structure according to any of paragraphs 0