JP2000103358A - Cross member of chassis frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chassis frame cross member having sufficient strength and twist rigidity, light in weight and low in costs. SOLUTION: A vertical connecting surface 2 suspended between side members, upper and lower connecting surfaces 6 and 6 and supporting surfaces 7 and 7 positioned in both ends of the vertical connecting surface 2 are integrally formed by folding, and the end parts of the supporting surfaces 7 and 7 are bent to be overlapped in the flange part 8 sides of the ends of the upper and lower connecting surfaces 6 and 6 for reinforcement. Thus, the strength of the flange part 8 to which high stress is applied and the twist rigidity of the entire cross member 2 are improved, and the weight and costs of the entire cross member are reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cross member constituting a part of a chassis frame such as a truck.

[0002]

2. Description of the Related Art As shown in FIG. 9, a chassis frame f such as a truck is generally used as shown in FIG.
Is formed by bridging a plurality of cross members b, b,... Between a pair of side members a, a made of, for example, a channel material. The axle c, the suspension d, and the fuel tank e are based on the chassis frame f. And other various parts can be attached.

The function of the cross member b constituting the chassis frame f may be different depending on the place where the cross member b is attached and how the cross member b is used. Many members obtained by press-forming a plate material as shown in FIGS. 9 and 10 into a channel shape are used in many cases, and flanges h, h at both ends thereof are bolted directly or via a trapezoidal gusset plate g. A rectangular frame-shaped chassis frame f is formed by fastening to the side members a, a by a rivet or the like.

[0004]

The cross member b generates high stress particularly on the flange portions h, h, which serve as fastening portions at both ends thereof. It was necessary to increase the thickness. In this case, the entire thickness of the cross member b is increased in order to increase the thickness of the flange portions h, h that require strength, and the thickness is increased to many parts that are not originally required. Was. Further, in order to increase the torsional rigidity of the cross member b itself, it is necessary to increase the plate thickness. As a result of these,
There is a disadvantage that the weight of the entire cross member b is significantly increased and the material cost is considerably increased.

If a gusset plate g or the like is used to reinforce the flanges h, the number of parts increases (3 to 5 points), and the production cost and the corresponding parts management cost increase. There was a problem that it would.

Accordingly, the present invention has been devised in order to effectively solve such a problem, and an object thereof is to provide a lightweight and low-cost chassis frame cross member having sufficient strength and torsional rigidity. Is provided.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a vertical connecting surface extending between a pair of side members, and an upper and lower connecting surface extending horizontally from upper and lower edges of the vertical connecting surface. A cross-member of a chassis frame having a one-sided, substantially box-like shape including a pair of support surfaces crossing between the vertical connection surface and the upper and lower connection surfaces, and a flange portion extending the upper and lower connection surfaces in a vehicle outward direction. The vertical connection surface, the upper and lower connection surfaces, and both support surfaces are integrally formed by folding a single plate material, and the end of the support surface is bent to be laid on the flange portion side to be reinforced.

That is, by overlapping the flange portions, it is possible to increase only the thickness of the upper and lower connecting surfaces where high stress is likely to occur without increasing the overall thickness, and to provide the support surface. Thereby, the torsional rigidity of the cross member can be increased, so that the thickness of the cross member can be reduced.

As a result, a significant increase in the weight of the entire cross member can be avoided, and the strength of the flange portion and the torsional rigidity of the cross member can be improved, so that a lightweight and low-cost chassis frame cross member can be obtained. .

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a perspective view showing an embodiment of a chassis frame 1 having a cross member 2 according to the present invention, and FIG. 2 is a perspective view showing an embodiment of the cross member 2 according to the present invention. .

As shown, the cross member 2 is
A plurality (about 3 to 5) of a pair of side members 3 and 3 made of a channel material are bridged at a fixed interval together with a cross member of another shape (not shown) to support the side members 3 and 3. The chassis frame 1 is connected to form a rectangular chassis frame 1.

The cross member 2 includes a vertical connecting surface 5 extending vertically, upper and lower connecting surfaces 6 and 6 extending horizontally from above and below the vertical connecting surface 5, and a vertical connecting surface 5 and a vertical connecting surface 6. , 6 and the supporting surface 7,
7 and flange portions 8, 8, 8, 8 extending divergently from both ends of the upper and lower connecting surfaces 6, 6, respectively.

The vertical connection surface 5, the upper and lower connection surfaces 6, 6, the support surfaces 7, 7, and the flange portions 8, 8, 8, 8 are
One plate 9 is folded three-dimensionally (channel material) and integrally formed, and both have a mutually continuous configuration.

More specifically, the upper and lower connecting surfaces 6, 6
Are formed continuously at right angles from the upper and lower edges of the vertical connection surface 5, and the support surfaces 7 are formed continuously at right angles from both ends of the vertical connection surface 5. Further, the flange portions 8, 8, 8, 8 are formed continuously at both ends of the upper and lower connecting surfaces 6, 6 in a divergent shape.

The upper and lower surfaces of the support surfaces 7, 7 are bent toward the ends of the vertical connection surface 5, and the bent surfaces 11, 11, 11, 11 are formed inside the flange portions 8, 8, 8, 8, 8, respectively. Are superimposed on each other.

A plurality of bolt holes 10 (three in the present embodiment) are formed in each of the flange portions 8, 8, 8, 8 and the bent surfaces 11, 11, 11, 11. As shown in FIG. 2, the upper and lower sides of the side members 3, 3 are firmly fastened by fastening bolts, rivets and the like (not shown).

In the cross member 2 of the present invention configured as described above, since a single plate member 9 is used and the entire structure is continuous and integrated, a large number of members are provided as in the conventional cross member with gusset. Since these parts are not required, the manufacturing cost is low.

In addition, the flange portions 8, 8, 8, 8 where the highest stress is most likely to occur are formed on the bent surface 1 extending from the support surfaces 7, 7.
Since the two sheets are reinforced by 1,11,11,11 and reinforced, there is no need to increase the overall plate thickness,
Overall weight reduction can be achieved. As shown in FIG. 1, by forming appropriate through-holes 12 in the central portions of the support surfaces 7 where no excessive stress is generated, a further reduction in weight can be achieved. The through holes 12 can serve as fastening holes for fastening rivets or the like when the cross member 2 is attached to the side members 3.

Further, since the connecting portion between the flange portion 8 and the side member 3 has a square pipe shape in cross section due to the side member 3 and the support surface 7, the strength of the connecting portion of the cross member 2 is, of course, increased. The torsional rigidity of itself is also greatly improved.

Next, a method of forming the cross member 2 of the present invention having such a structure will be described.

First, a steel plate having a uniform thickness is prepared, and a plate material 9 having a shape as shown in FIG. 3 is formed by a punching machine.

As shown in the figure, the plate member 9 is formed with upper and lower connecting surfaces 6, 6 which are developed in a mirror shape on the upper and lower sides of a rectangular vertical connecting surface 5 located at the center in the figure, and are further formed. Flanges 8, 8, 8, 8 extending vertically in the drawing are formed at both ends of the upper and lower connecting surfaces 6, 6, respectively. Further, substantially rectangular support surfaces 7, 7 are continuously formed at both ends of the vertical connection surface 5, and further,
On the upper and lower sides of the support surfaces 7, 7 in the figure, wedge-shaped bent surfaces 11, 11, 11, 11 are formed continuously.

Then, the plate member 9 having such a shape is set on a press machine, and the boundary line S between the respective components is folded three-dimensionally and mountain-folded to deform three-dimensionally as shown in FIG. Further, the cross member 2 of the present invention as shown in FIG. 1 is obtained by folding the boundary line S between these components by a press machine.

Specifically, in FIG. 3, dashed dotted lines S1 and S1, which are boundaries between the vertical connecting surface 5 and the upper and lower connecting surfaces 6 and 6,
The two-dot broken lines S2 and S2, which are the boundaries between the vertical connection surface 5 and the support surfaces 7, 7 are folded at right angles in the same direction, respectively, to form a dotted line that is the boundary between the support surfaces 7 and the bending surfaces 11, 11. S3, S
3, S3, and S3 are valley-folded at right angles, and solid lines S4 and S, which are boundaries between the bent surface 11 and the upper and lower connecting surfaces 6, respectively.
4, S4, and S4 are press-formed so as to be bent at 180 degrees.

Therefore, it is not necessary to assemble a gusset made of a separate member as in the prior art, so that the production efficiency is improved, and the flange portions 8, 8, 8, 8, which require strength, can be easily reinforced. Thus, a high-strength cross member 2 can be obtained at low cost.

FIGS. 5 and 6 show another embodiment of the present invention.

As shown in the figure, the cross member 2 of the present embodiment has flange portions 8, 8, 8, 8 formed on the support surfaces 7, 7 so as to be flush with the support surfaces 7, 7 and is connected vertically. The both ends of the surfaces 6 and 6 are bent to form a bent surface 1
1, 11, 11, 11 and the flanges 8,
The bent surfaces 11, 11, 11, 11 are superimposed on the inside of 8, 8, 8, respectively.

That is, as shown in FIG. 7, boundary lines S3 and S3 are formed at both ends of the upper and lower connecting surfaces 6 and 6, and these are bent at 90 ° valleys as shown in FIG. It is configured to be superimposed on the inside of 7,7.

In the cross member 2 of the present embodiment configured as described above, each of the flange portions 8, 8, 8, 8 is formed directly on the vertical surface of the side member 3 as shown in FIG. Except for the fastening, excellent lightening and low cost can be simultaneously exhibited as in the above embodiment.

[0031]

In summary, according to the present invention, the following excellent effects can be exhibited.

(1) Since one plate is formed by folding three-dimensionally, the manufacturing cost is lower than when a plurality of members are combined.

(2) When the plate is folded and formed, two portions requiring strength are overlapped, so that the strength can be easily improved.

(3) The torsional rigidity can be easily improved by providing a support surface having a high torsional rigidity when the plate material is folded and formed.

(4) This eliminates the need to increase the overall plate thickness, and achieves weight reduction.

(5) Further, there is no need to add a reinforcing plate such as a gusset after molding, and the workability is improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a cross member according to the present invention.

FIG. 2 is a perspective view showing one embodiment of a chassis frame including a cross member according to the present invention.

FIG. 3 is a development view of a cross member according to the present invention.

FIG. 4 is a perspective view showing a state where the cross member according to the present invention is folded and formed.

FIG. 5 is a perspective view showing an embodiment of a chassis frame provided with another cross member according to the present invention.

FIG. 6 is a perspective view showing an embodiment of another cross member according to the present invention.

FIG. 7 is a development view of the cross member shown in FIG. 6;

FIG. 8 is a perspective view showing a state where the cross member shown in FIG. 6 is folded and formed.

FIG. 9 is a perspective view showing an example of a chassis frame provided with a conventional cross member.

FIG. 10 is a perspective view showing an example of a conventional cross member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Chassis frame 2 Cross member 3 Side member 5 Vertical connection surface 6 Vertical connection surface 7 Support surface 8 Flange part 9 Plate material 11 Bending surface

Claims (2)

[Claims] 1. A vertical connection surface spanned between a pair of side members, an upper and lower connection surface extending horizontally from upper and lower edges of the vertical connection surface, and a pair of upper and lower connection surfaces crossing the vertical connection surface and the upper and lower connection surfaces. One-sided open box shape consisting of a support surface,
In the cross member of the chassis frame provided with a flange portion having the upper and lower connection surfaces extended in the vehicle outer direction, the vertical connection surface, the upper and lower connection surfaces, and both support surfaces are integrally formed by folding a single plate. A cross member of a chassis frame, wherein an end of the support surface is bent and overlapped with the flange portion to reinforce the support member. 2. A vertical connecting surface extending between a pair of side members, an upper and lower connecting surface extending horizontally from upper and lower edges of the vertical connecting surface, and a pair of upper and lower connecting surfaces crossing the vertical connecting surface and the upper and lower connecting surfaces. One-sided open box shape consisting of a support surface,
In a cross member of a chassis frame having a flange portion extending both support surfaces in the vertical direction, the vertical connection surface and the upper and lower connection surfaces and both support surfaces are integrally formed by folding a single plate material, A cross member of a chassis frame, wherein an end portion of the upper and lower connecting surfaces is bent and overlapped with the flange portion to reinforce it.