JPH0361177A - Center member for automobile - Google Patents

Abstract

PURPOSE:To simplify the manufacturing and uniformalize and improve the strength by mutually joining given parts of two extruded pipes parallelly arranged, connecting a reinforcing frame to the middle part, and also forming a fitting surface, to which a flat sqeezing process is applied, on both end parts. CONSTITUTION:A center member 20 is formed with two extruded pipes 22 and 24 parallelly arranged as a main body, and also the given parts of them are previously joined mutually with a linking body 26. A reinforcing frame 28 is connected to the middle upper parts of individual pipes 22 and 24 with individual arc welded parts. Moreover individual fitting surfaces 22c and 24c also 22d and 24d, to which a flat squeezing process is applied respectively, are formed on the both end parts of individual pipes 22 and 24, and also a bolt fitting hole is opened respectively to each of the fitting surface. Individual fitting surfaces 22c-24d are fixed to a body side using individual bolts 34a and 34b respectively. This facilitates the manufacturing and the whole the strength can uniformly be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a center member for an automobile for supporting heavy members such as an engine unit.

Conventional technology In general, a center member for an automobile has a shape in which both ends are attached to the vehicle body and extend in the longitudinal direction of the vehicle, and it supports heavy components such as the engine unit from below. Therefore, it is necessary to maintain sufficient strength to withstand large loads.

As an example of such a center member, the structure of the center member 10 shown in FIGS. 9 to 11 is disclosed in, for example, Japanese Patent Publication No. 4-TEF 1986-22623. That is, this center member 10 is mainly composed of two steel pipes 12.14 arranged in parallel, and both pipes 1 are provided at the upper and lower portions of the approximately central portion of the steel pipes 12.14.
The reinforcing frames 16.18 for connecting and integrating the parts 2.14 and 2.14 are connected to the arc welding parts 16a, 16b and the arc welding part 1, respectively.
It is joined and fixed by 8a and 18b. Both pipes 12
．． 14 has a circular cross section and is formed into an arch shape as a whole, and is spaced apart from the substantially central portion to the ends 12a and 14a on one side, and the end 12a on the blade side , 1.4a and the other end 12b, ]/l
b has a flat flattened mounting surface], 2
C:, 1.4. C and mounting surfaces +2d and 14d are formed, and these mounting surfaces (=1 surface 1.2C, 14C and mounting surfaces 12d and 14d) are fixed to the vehicle body side. As above mounting surface 1.2d, 1
4d, an arc welding portion 19 is also formed.

The lower reinforcing frame 18 serves as a jacking contact surface when the vehicle is jacked. Also, the upper reinforcing frame 16 and the pipes 12, 1.4 are separated by a predetermined distance d. The section modulus of the center member IO is increased by this distance, thereby increasing the overall strength.

According to such a configuration of the center member 10, the load acting on the center member 10 is reduced by two wooden steel pipes 1.2.
．． 14, it is possible to make both pipes 12 and 14 smaller in diameter and thinner.Furthermore, pipes with different diameters and wall thicknesses can be selected and applied depending on the applied load, so it can be applied depending on the vehicle model. It has the feature that it is possible to use the most suitable center members.

Problems to be solved by the invention However, such conventional center members for automobiles
In the structure of O, in order to fix the two pipes 121/I, a pair of reinforcing frames 16 and 18 are required, and these reinforcing frames 16 and 18 are attached to the pipes 12 and 14. Since there are many arc welded parts for fixing, manufacturing is complicated, and variations in the strength of the center member 10 as a whole are likely to occur due to differences in welding strength. was there.

Further, by providing a predetermined distance d between the upper reinforcing frame 16 and the pipe], 2.1.4, the center member 1
The section modulus of 0 is increased, but due to the process, this spacing @
Since it is difficult to keep the dimension d constant for the entire product, the rigidity of the center member 10 is not constant due to variations in the section modulus, and 1.2. This eliminates the problem that it takes time to complete the 14th test.

Therefore, an object of the present invention is to solve the problems caused by the structure of conventional center members for automobiles, and to provide a center member that has no variation in strength as a center member and is easy to manufacture. That is.

Means for Solving the Problems In order to achieve the above object, the present invention provides a center member for an automobile that extends in the longitudinal direction of a vehicle, has both ends attached to the vehicle body, and supports a heavy body mounted on the vehicle. It is mainly composed of two extruded pipes which are arranged concurrently and are connected to each other at predetermined parts by a connecting body, and a reinforcing frame is joined and fixed to the upper part of the approximately central part of the extruded pipes. On the other hand, a center member for an automobile has a structure in which a flat mounting surface is formed on both ends along the longitudinal direction of an extruded pipe from a substantially central portion of the center member.

According to the +i17 construction, it is integrally extruded in advance through two pipes or a connecting body, and only the upper reinforcing frame needs to be fixed during assembly, making production extremely simple. In addition, it is characterized in that variations in strength of the center member as a whole due to differences in welding strength do not occur.

Furthermore, since the positional relationship between the two pipes is determined by the connecting body, there is no variation in the relative position between both pipes and the reinforcing frame, and the section modulus is also kept approximately constant, increasing the rigidity of the center member. This provides the effect of making it possible to maintain a constant value.

EMBODIMENTS Various embodiments of an automobile center member according to the present invention will be described in detail below with reference to the drawings.

1 to 5 show a first embodiment of the present invention,
The center member 20, which is not shown in its entirety in the figure, is mainly composed of two extruded pipes 22 and 24 arranged in parallel, and as shown in the cross-sectional view of FIG. A predetermined portion of .24 is connected in advance by a connector 26. Reference numeral 26a indicates a drainage hole opened at an appropriate portion of the connecting body 26. The extruded pipes 22 and 24 can be formed using a metal material such as aluminum using a predetermined extrusion molding machine.

Furthermore, a reinforcing frame 28 or arc welded portions 28a, 28b are provided at the upper portions of the two extruded pipes 22, 24 at approximately the center.
It is bonded and fixed by.

The extrusion-molded pipes 22, 24 have a circular cross section and are formed into an arch shape as a whole, and are spaced apart from each other from the substantially central portion to the ends 22a, 24a on one side. As shown in the figure, the connecting body 26 in this spaced portion is separated into left and right parts.

Also, one end 22a of the extruded pipe 22.24,
As shown in FIG. 4, the holes 24a are flattened (=1 side 22c, 24c), and Holt hole 30a is formed on the holes 22c, 2/lc. ,3
0b is open while the extruded pipe 22.24
As shown in FIG.
Holt mounting holes 32a and 32b are opened in these holes 22d and 24d. The two receiving surfaces 22c, 24c and mounting surfaces 22d, 24d are fixed to the vehicle body using bolts 34a, 34b shown in FIG.

In the illustrated example, both pipes 22.2 extend from the approximately central portion of the center member 20 to the ends 22a, 24a on one side.
4 are spaced apart from each other, but both pipes 22
．． The pipes 22 and 24 do not necessarily need to be spaced apart, and both pipes 22 and 24 may be held in parallel depending on the vehicle type. When both pipes 22, 24 are held in parallel in this way, there is no need to cut the connecting body 26, and therefore, in the case of this embodiment, the two extruded pipes 22, 24 are cut along the longitudinal direction. What is necessary is to selectively cut an appropriate portion of the connecting body 26.

According to such a first embodiment, two pipes 22.2
4 are integrally extruded in advance through a connecting body 26.''2. Two pipes 22.2 are connected by this connecting body 26.
4 has been determined, the pipe 22.2
4, only the upper reinforcing frame 28 needs to be fixed, eliminating the need for the lower reinforcing frame 18 (see Fig. 9), which was previously required.As a result, the number of arc welded parts is reduced, simplifying the process. This method is characterized in that variations in strength of the center member as a whole due to differences in welding strength do not occur.

Further, since the relative positions of both pipes 22, 24 and the reinforcing frame 28 do not vary, the section modulus is also kept approximately constant, and the rigidity of the center member 20 can be kept constant.
In addition, the pipes 22 and 24 can be easily set when assembling them.

Furthermore, by opening the drain holes 26a at appropriate locations in the connecting body 26, muddy water will not be accumulated between the pipes 22, 24 and the reinforcing frame 28.

FIG. 6 shows a second embodiment of the present invention, which is a cross-sectional view of a portion similar to that shown in FIG. It has a structure in which the connecting body 26 and the reinforcing frame 28 are integrally molded in advance. The structure in which drain holes 26a are opened at appropriate locations in the connecting body 26 is the same as in the first embodiment.

In this second embodiment, the reinforcing frame 28 is connected to both pipes 22 and 24.
This eliminates the need for arc welding to the pipes 22.2 and 28, and the relative position of the pipes 22.2 and 28 remains constant.
When separating the parts 24 appropriately, the connecting body 26 and the reinforcing frame 2
Just cut 8.

The basic operation of the second embodiment is the same as that of the first embodiment.

FIG. 7 and FIG. 8 show a third embodiment of the present invention, and in this example, the water drain hole 26a is
The two pipes 22 and 24 are connected in advance by a connecting body 26 having a protrusion 36a,
36b is provided protrudingly, and when installing the reinforcing frame 28, both ends of the reinforcing frame 28 are arc welded to the projections 36a, 36b by arc welding parts 28a, 28b. J Just run.

According to the third embodiment, the work of fixing the reinforcing frame 28 is facilitated, and both pipes 22, 24 and h after assembly are
It exhibits the characteristic that it has a constant relationship with ij strong frame 2B. Other basic functions are the same as those of the first embodiment.

Effects of the Invention As explained in section 5 below, the center member for l'l movement and small movement according to the present invention provides the following effects. That is, since the reinforcing frame was fixed to the upper part of the approximately central part of two extruded pipes that were arranged in parallel and connected to each other at predetermined portions by a connecting body, Since the wooden pipes are connected by a connecting body, only the upper reinforcing frame needs to be fixed to both pipes when assembling, which greatly simplifies production.
This has the effect of increasing the overall strength without causing variations in the strength of the center member as a whole due to differences in welding strength. In addition, since the positional relationship between the two pipes is determined by the above-mentioned connecting body, there is no variation in the relative relationship between the two pipes and the reinforcement, and the section modulus is also maintained at approximately -. ,
34b--bolts, 36a, 36b--protrusions, it is possible to keep the rigidity of the center member constant by hanging down, and it also has the effect of making it easier to center the pipe when stringing it.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing a first embodiment of an automobile tantamenha according to the present invention, Fig. 2 is a cross-sectional view taken along line 1 in Fig. 1, and Fig. 3 is a sectional view taken along line 11 in Fig. 1. Cross-sectional view, Figure 4 is a cross-sectional view along the ■--I line in Figure 1, Figure 5 is a cross-sectional view along the ■-- line in Figure 1.
■A sectional view taken along the line, FIG. 6 is a sectional view of the main part showing the second embodiment of the present invention, FIGS. 7 and 8 are sectional views of the main part showing the third embodiment of the invention, and FIG. 9 is a perspective view showing an example of a conventional center member; FIG. 1O is a sectional view taken along the line X-X in FIG. 9;
FIG. 11 is a sectional view taken along line XI-]1 in FIG. 9. 20...Center member, 22.24...Extruded pipe, 22c, 24c, 22d, 24d-mounting surface, 26...
Connecting body, 26a Drain hole, 28 Reinforcement frame, 28, 28b..."r-ri welded part, 30
a, 30b, 32a, 32b Holt hole (: I hole, 2-

Claims (1)

[Claims] (1) In an automobile center member that extends in the longitudinal direction of the vehicle and has both ends attached to the vehicle body to support a heavy object mounted on the vehicle, the center members are arranged in parallel and A predetermined portion is mainly composed of two extruded pipes connected to each other by a connecting body, and a reinforcing frame is bonded and fixed to the upper part of the approximately central portion of the extruded pipe, and a reinforcing frame is connected and fixed from the approximately central portion of the center member. A center member for an automobile, characterized in that a flat mounting surface is formed at both longitudinal ends of an extruded pipe.