JP4124879B2 - Chassis frame cross member - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cross member constituting a part of a chassis frame such as a truck.
[0002]
[Prior art and problems to be solved by the invention]
As shown in FIG. 9, a chassis frame f such as a track is generally formed by bridging a plurality of cross members b, b... Between a pair of side members a made of channel material or the like. Various components such as an axle c, a suspension d, and a fuel tank e are attached based on the frame f.
[0003]
The functions of the cross member b constituting the chassis frame f may vary depending on the place of attachment and the way it is used. However, the main function of improving the torsional rigidity with respect to the entire chassis frame f has been described in FIG. A member obtained by press-molding a plate material as shown in FIG. 10 into a channel shape is often used, and bolts, rivets, etc. are directly connected to flange portions h, h at both ends thereof or via trapezoidal gusset plates g. Thus, a rectangular frame-shaped chassis frame f is formed by fastening to the side members a and a.
[0004]
[Problems to be solved by the invention]
By the way, since this cross member b generate | occur | produces a high stress especially on the flange parts h and h side used as the fastening part of the both ends, in order to improve the intensity | strength of this part, it was necessary to thicken board thickness. In this case, the thickness of the entire cross member b is increased in order to increase the thickness of the flange portions h and h that require strength, and the plate thickness is increased to many portions that are not originally required. It was. In addition, it is necessary to increase the plate thickness in order to increase the torsional rigidity of the cross member b itself. As a result, the overall weight of the cross member b is greatly increased and the material cost is considerably increased.
[0005]
Further, if the gusset plate g or the like is used for reinforcing the flange portions h, h, the number of parts increases (3 to 5 points), and the manufacturing cost and the corresponding part management cost increase. was there.
[0006]
Therefore, the present invention has been devised to effectively solve such problems, and an object of the present invention is to provide a chassis frame cross member that has sufficient strength and torsional rigidity and is light and low in cost. Is.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides 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 the vertical connection surface and the upper and lower connection surface. In a cross member of a chassis frame comprising a generally open box shape comprising a pair of support surfaces that cross between each other and a flange portion that extends the upper and lower connection surfaces in the vehicle outer direction, the vertical connection surface, the upper and lower connection surfaces, and Both the support surfaces are integrally formed by folding a single plate, and the end portions of the support surfaces are folded and overlapped on the flange portion side for reinforcement.
[0008]
In other words, by superimposing the flange portions, it is possible to increase only the plate thickness of the upper and lower connecting surfaces where high stress is likely to occur without increasing the overall plate thickness, and to provide a cross by providing the support surface. Since the torsional rigidity of the member can be increased, the thickness of the cross member can be reduced.
[0009]
As a result, a significant increase in 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. Therefore, a lightweight and low-cost chassis frame cross member can be obtained.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Next, a preferred embodiment for carrying out the present invention will be described with reference to the accompanying drawings.
[0011]
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.
[0012]
As shown in the figure, this cross member 2 is bridged with a plurality of (about 3 to 5) crossing members with a certain distance between a pair of side members 3 and 3 made of channel material together with cross members of other shapes not shown. The rectangular chassis frame 1 is configured by supporting and connecting the side members 3 and 3.
[0013]
The cross member 2 includes a vertical connection surface 5 extending vertically, upper and lower connection surfaces 6 and 6 extending horizontally from above and below the vertical connection surface 5, and the vertical connection surface 5 and the upper and lower connection surfaces 6 and 6. The support surfaces 7 and 7 crossing the both ends of the upper and lower connecting surfaces 6 and 6 and flanges 8, 8, 8 and 8 extending from the both ends of the upper and lower connecting surfaces 6 and 6 respectively.
[0014]
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 integrally formed by folding a single plate material 9 into a three-dimensional shape (channel material shape). All of them are mutually continuous.
[0015]
More specifically, the upper and lower connecting surfaces 6 and 6 are continuously formed in a perpendicular direction from the upper and lower edges of the vertical connecting surface 5, and the support surfaces 7 and 7 are perpendicular to both ends of the vertical connecting surface 5. Are formed continuously. Further, the flange portions 8, 8, 8, 8 are continuously formed in a divergent shape at both end portions of the upper and lower connecting surfaces 6, 6.
[0016]
Further, the upper and lower surfaces of the support surfaces 7 and 7 are bent in the direction of the end portion of the vertical connecting surface 5, and the bent surfaces 11, 11, 11, 11 are overlapped with the flange portions 8, 8, 8, 8, respectively. It has come to be.
[0017]
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, and 11, respectively. As shown in FIG. 4, the upper and lower sides of the side members 3 and 3 are firmly fastened by fastening bolts, rivets or the like (not shown).
[0018]
In the cross member 2 of the present invention configured as described above, since a single plate material 9 is used and the whole is a continuous and integral structure, a large number of parts are used like a conventional cross member with a gusset. Since it is not necessary, the production cost is low.
[0019]
In addition, since the flange portions 8, 8, 8, and 8 where the highest stress is most likely to occur are reinforced by overlapping the bent surfaces 11, 11, 11, and 11 extending from the support surfaces 7 and 7, the overall plate thickness It is no longer necessary to increase the thickness, and the overall weight can be reduced. In addition, as shown in FIG. 1, if the appropriate through-holes 12 and 12 are each formed in the center part of the support surfaces 7 and 7 which do not generate excessive stress, weight reduction can be achieved. Further, the through holes 12 and 12 can be working holes for fastening rivets or the like when the cross member 2 is attached to the side member 3.
[0020]
Furthermore, since the connecting portion between the flange portion 8 and the side member 3 is formed into a square pipe shape by the side member 3 and the support surface 7, the strength of the connecting portion of the cross member 2 and the torsion of the cross member 2 itself are of course. The rigidity is also greatly improved.
[0021]
Next, a method for forming the cross member 2 of the present invention having such a structure will be described.
[0022]
First, a steel plate having a uniform plate thickness is prepared, and a plate 9 having a shape as shown in FIG. 3 is formed by a punching machine.
[0023]
As shown in the figure, this plate member 9 is formed by continuously forming upper and lower connecting surfaces 6 and 6 in a mirror shape on the upper and lower sides of the rectangular vertical connecting surface 5 located in the center, and further, Flange portions 8, 8, 8, 8 extending in the vertical direction in the figure are respectively formed at both ends of the connecting surfaces 6, 6. Further, substantially rectangular support surfaces 7 and 7 are continuously formed at both ends of the vertical connection surface 5, and a wedge-shaped bent surface 11 is provided above and below the support surfaces 7 and 7 in the figure. , 11, 11, 11 are formed continuously.
[0024]
Then, the plate material 9 having such a shape is installed in a press machine, and the boundary line S between each component member is valley-folded and mountain-folded, respectively, and three-dimensionally deformed as shown in FIG. By folding the boundary line S between these constituent members with a press, the cross member 2 of the present invention as shown in FIG. 1 is obtained.
[0025]
Specifically, in FIG. 3, one-dot broken lines S1 and S1 that are boundaries between the vertical connection surface 5 and the upper and lower connection surfaces 6 and 6, and two boundary lines between the vertical connection surface 5 and the support surfaces 7 and 7 are shown. Dotted lines S2 and S2 are mountain-folded at right angles in the same direction, and dotted lines S3, S3, S3 and S3, which are boundaries between the support surfaces 7 and the bent surfaces 11 and 11, are respectively valley-folded and bent at right angles. The solid lines S4, S4, S4, and S4, which are boundary lines between the surface 11 and the upper and lower connecting surfaces 6, are press-molded so as to be folded 180 degrees each.
[0026]
Therefore, it is not necessary to assemble a gusset made of different members as in the prior art, so that the production efficiency is improved and the flange portions 8, 8, 8, 8 that require strength can be easily reinforced. A strong cross member 2 can be obtained at low cost.
[0027]
Next, FIGS. 5 and 6 show another embodiment of the present invention.
[0028]
As shown in the figure, the cross member 2 of the present embodiment is formed with flange portions 8, 8, 8, 8 on the support surfaces 7, 7 described above so as to be flush with the support surfaces 7, 7, and the upper and lower connecting surfaces 6, 6. 6 are bent to form bent surfaces 11, 11, 11, 11, respectively, and the bent surfaces 11, 11, 11, 11 are superposed on the inner sides of the flange portions 8, 8, 8, 11, respectively. It is a thing.
[0029]
That is, as shown in FIG. 7, boundary lines S3 and S3 are formed on both end sides of the upper and lower connecting surfaces 6 and 6, and each of the support surfaces 7 and 7 is folded by 90 ° as shown in FIG. It is comprised so that it may overlap with the inside.
[0030]
And in the cross member 2 of this Embodiment comprised in this way, as shown in FIG. 5, each flange part 8,8,8,8 is directly fastened by the vertical surface side of the side member 3. As shown in FIG. Except for this point, it is possible to simultaneously achieve excellent weight reduction and low cost as in the above embodiment.
[0031]
【The invention's effect】
In short, according to the present invention, the following excellent effects can be exhibited.
[0032]
(1) Since a single plate material is formed by three-dimensionally folding it, the manufacturing cost is lower than in the case where a plurality of members are combined.
[0033]
(2) Since the two parts that require strength are overlapped at the time of folding the plate material, the strength can be easily improved.
[0034]
(3) By providing a support surface that increases the torsional rigidity at the time of folding the plate material, the torsional rigidity can be easily improved.
[0035]
(4) This eliminates the need to increase the overall plate thickness and achieves weight reduction.
[0036]
(5) Moreover, work such as adding a reinforcing plate such as a gusset after the molding becomes unnecessary, and 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 an embodiment of a chassis frame having 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 when a cross member according to the present invention is folded and formed.
FIG. 5 is a perspective view showing an embodiment of a chassis frame having 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.
7 is a development view of the cross member shown in FIG. 6. FIG.
8 is a perspective view showing a state when the cross member shown in FIG. 6 is folded and formed. FIG.
FIG. 9 is a perspective view showing an example of a chassis frame having 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)

One surface comprising a vertical connecting surface spanned 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 support surfaces crossing between the vertical connecting surface and the upper and lower connecting surfaces In a cross member of a chassis frame having an open substantially box shape and a flange portion that extends the upper and lower connection surfaces in the vehicle outer direction, the vertical connection surface, the upper and lower connection surfaces, and both support surfaces are folded into a single plate. A cross member of the chassis frame, wherein the cross member is integrally molded, and the end portion of the support surface is bent and overlapped on the flange portion side to be reinforced. A vertical connecting plane spanned between a pair of side members, and upper and lower connecting surface extending horizontally from the upper and lower edges of the vertical coupling plane, one face comprising a pair of support surfaces for connecting the vertical coupling plane with the upper and lower connecting surface In the cross member of the chassis frame having an open substantially box shape and a pair of flange portions extending upward from the upper ends of the both supporting surfaces and extending downward from the lower ends of the both supporting surfaces , the vertical connecting surface and the upper and lower connecting surfaces The chassis frame cross member is formed by integrally molding the two support surfaces by folding a single plate member, and bending and reinforcing the end portions of the upper and lower connecting surfaces to overlap the flange portions .

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