JP3540879B2 - Front frame structure of vehicle - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a front frame structure of a vehicle.
[0002]
[Prior art]
The front body frame of the vehicle is composed of left and right front frames and front parts extending forward from the toeboard along the left and right front wheel aprons, and is coupled to the rear end of the front frame and front from the lower side of the toeboard to the lower surface of the front floor. The front end of the front frame front is fixed to the radiator panel side, and the front bumper is attached to the front end by a bumper stay. -The front end of the front is generally connected by a radiator lower frame.
[0003]
[Problems to be solved by the invention]
In order to effectively absorb the collision energy at the time of a frontal collision of the vehicle, it is desirable that the front frame front be stably buckled from its front end. However, the radiator lower frame that connects the front ends of the left and right side frames and front is offset below the front end of the front frame front in order to secure the height direction space for mounting the radiator. Due to the downward offset, the radiator lower frame has a low spreading function of the left and right front frames and front front ends.The function of restraining bending deformation is low, and the left and right front frames and front spread in the event of a frontal collision. This causes a problem that the buckling deformation of the front frame / front becomes difficult to obtain.
[0004]
An object of the present invention is to solve the conventional problems as described above.
[0005]
[Means for Solving the Problems]
The present invention relates to a front frame structure for a vehicle in which the left and right ends of a radiator lower frame are coupled to the front ends of the left and right front frames and the front ends thereof as described above, with the left and right front frames and the front frames being the same. A tension bar for directly connecting between the front ends of the front bumper is provided behind the bumper beam of the front bumper, and the left and right ends of the tension bar are formed between the front end of the front frame / front and the rear end of the front bumper bumper stay. It is characterized in that it is fixed to the front end of the front frame / front by being fastened together with the rear end of the bumper stay with mounting bolts in a state of being sandwiched between the front ends of the front frame and the front. The bending deformation of the left and right front frame and front in the spreading direction at the time is prevented by the restraint by the tension bar. The front frame front is stably buckled and deformed from the front end to the rear to be able to effectively absorb the collision energy. The collision load is effectively transmitted and dispersed to the other front frame / front via the tension bar. Furthermore, since the tension bar is formed of a hat-shaped cross-sectional member having a width smaller than the vertical width of the front end flange of the front frame / front, even if the tension bar is arranged across the front surface of the radiator, the cooling of the radiator can be achieved. By increasing the vertical width of the left and right parts of the tension bar, which is not related to the cooling air introduction of the radiator, without affecting the function, and making the left and right parts of the tension bar larger than the other parts, It is possible to adopt a mounting structure in which the front bumper is sandwiched between the front end portion and the rear end portion of the bumper stay of the front bumper and is fixed to the front frame / front front end portion by fastening together with the mounting bolt.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0007]
In FIG. 1, reference numeral 1 denotes left and right front wheel aprons, 2 denotes left and right front frame fronts having a box-shaped cross-section arranged along the wheel apron, and a rear end of the front frame front 2 The front end of the front frame 2 is connected to the front end of the front frame 2 at the rear end of the front frame 2.
[0008]
At the front ends of the left and right front frames / fronts 2, the left and right ends of the radiator lower frame 4 are connected by a connecting member 4a that hangs downward from the front ends of the front frames / fronts, and the radiator lower frame 4 is attached. The front end portions of the left and right front frames / fronts 2 are connected in a state where they are offset downward by a predetermined height. The front ends of the left and right front frames / fronts 2 and the front surfaces of the connecting member 4 a and the left and right portions of the radiator lower frame 4 are fixed to a radiator panel side 5.
[0009]
Reference numeral 6 denotes a tension bar. The left and right ends of the tension bar 6 are fixed to the front ends of the left and right front frames / fronts 2 at the front part of the radiator panel side 5, and the front ends of the left and right front frames / front 2 are fixed. It connects straight between the clubs.
[0010]
Reference numeral 7 denotes a front bumper. As is conventionally known, the front bumper 7 covers a bumper beam 71 to which left and right bumper stays 72 are fixed and a front portion of the bumper beam 71 with a shock absorber (not shown) interposed therebetween. The rear ends of the left and right bumper stays 72 are abutted and fixed to the front ends of the front frame and front 2 with the tension bar 6 interposed therebetween.
[0011]
In FIG. 1, reference numeral 9 denotes a suspension cross member for mounting a front suspension. The suspension cross member 9 has its left and right ends attached to the lower surfaces of the rear portions of the left and right front frames / fronts 2 with mounting bolts. It is.
[0012]
FIG. 2 shows a detailed example of the tension bar 6 and its mounting structure.
[0013]
That is, as shown in FIG. 2, the tension bar 6 is formed of a hat-shaped cross section member having a width smaller than the vertical width of the front end flange 2a of the front frame front 2 having a box-shaped cross section.
[0014]
The front frame / front 2 has its front end flange 2a butted against the radiator panel side 5 and is fixed. The front end of the front frame 2 has the side end of the tension bar 6, and the front bumper 7 of the front bumper 7 has the front end. By fixing the rear end flange 72a of the bumper stay 72, the tension bar 6, and the front end flange 2a of the front frame front 2 together with mounting bolts 8, the tension bar 6 and the front bumper 7 can be simultaneously front-mounted. It is attached to the front end of the frame front 2.
[0015]
As described above, by adopting a structure in which the front ends of the left and right front frames / fronts 2 are directly connected by the tension bar 6, bending deformation of the left and right front frames / fronts 2 in a spreading direction is reduced by tension. In the event of a frontal collision, the left and right front frames / fronts 2 are securely restrained by the bar 6 and are not bent and deformed in the direction in which the front ends spread, and are subjected to the collision load input from the bumper stay 72. 2 stably buckles and deforms rearward from the front end, and can effectively absorb the collision energy.
[0016]
Further, for example, as shown in FIG. 1 (B), in the case of a one-sided frontal collision that is biased to one of the left and right sides, the collision load input to the front end of one front frame / front 2 is applied via the tension bar 6 to the other. Can effectively absorb the collision energy by being effectively dispersed to the front frame / front 2.
[0017]
Since the tension bar 6 crosses the front surface of a radiator (not shown) mounted on the radiator lower frame 4, the width of the tension bar 6 should be as small as possible so as not to adversely affect the cooling function of the radiator. Therefore, in the illustrated embodiment, the width of the tension bar 6 is smaller than the vertical dimension of the front end of the front frame / front 2. However, the width of the tension bar 6 is The upper and lower flanges of the tension bar 6 are sandwiched between the upper and lower flanges of the front end flange 2a of the front frame / front 2 and the rear end flange 72a of the bumper stay 72. The overlapping portions may be fixed together by mounting bolts. The connection between the left and right end portions of the tension bar 6 and the front end portions of the left and right front frames / fronts 2 is not limited to the illustrated example, and any connection structure can be adopted.
[0018]
【The invention's effect】
As described above, according to the present invention, the front ends of the left and right front frames and the front ends are separately connected to the radiator lower frame that is offset downward, and the front bar is directly connected by the tension bar. Bending deformation in the expanding direction of the left and right front frame / front front part at the time of collision is restrained by the tension bar, and the front frame / front is stably buckled rearward from the front end to effectively absorb collision energy. Becomes possible. In the case of a frontal one-side collision, the collision load input to one front frame / front is transmitted to the other front frame / front via a tension bar and dispersed, so that efficient collision energy absorption is performed. Thus, a great effect can be obtained with a very simple configuration.
[Brief description of the drawings]
FIG. 1 shows an embodiment of the present invention, in which (A) is a perspective view of a front vehicle body, and (B) is a view of a frame structure of the front vehicle body as viewed from above.
2 (A) is an exploded perspective view of a portion X in FIG. 1 (B), and FIG. 2 (B) is a view taken along the line YY in FIG. 1 (B).
[Explanation of symbols]
REFERENCE SIGNS LIST 1 wheel apron 2 front frame / front 2 a front end flange 3 front frame / rear 4 radiator lower frame 4 a coupling member 5 radiator panel side 6 tension bar 7 front bumper 8 mounting bolt 71 bumper beam 72 bumper stay 72 a rear end flange

Claims (3)

In the front frame structure of a vehicle in which the left and right ends of the radiator lower frame are coupled to the front ends of the left and right front frames and fronts arranged in the front-rear direction along the left and right front wheel aprons with being offset downward, A tension bar for directly connecting the front ends of the left and right front frames and the front is disposed behind the bumper beam of the front bumper, and the left and right ends of the tension bar are connected to the front end of the front frame and the front bumper. The vehicle is characterized in that it is fixed to the front end of the front frame / front by fastening together with the rear end of the bumper stay while being sandwiched between the rear end of the bumper stay and the front end of the front frame. Front frame structure. 2. The vehicle front frame structure according to claim 1, wherein the tension bar is formed of a hat-shaped cross-sectional member having a width smaller than a vertical width of a front end flange of the front frame / front. Front frame structure. 3. The front frame structure of a vehicle according to claim 1, wherein the vertical width of the left and right portions of the tension bar is larger than the vertical width of the other portions. Construction.

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