JP3051546B2 - Car front body structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle front body structure, and more particularly to a vehicle front body structure provided with a front bumper so as to reduce damage to the vehicle during a collision. .

[0002]

2. Description of the Related Art Conventionally, as a structure in which a front bumper is mounted on a vehicle, a reinforcement serving as a mounting base of the front bumper is mounted on left and right brackets of a pair of left and right front side frames extending in the front-rear direction of the vehicle. A structure in which a cushion member made of a urethane resin or the like is interposed thereon and an outer cover formed by molding a soft resin or the like is provided (for example, Japanese Utility Model Application Laid-Open No. 2-752)
No. 50) is known. Referring to the drawings, a conventional front bumper mounting structure will be described. FIG. 6A is a partially cutaway plan view of a first example of a conventional front body structure of an automobile, and FIG. .

First, in FIG. 6 (a), a pair of left and right front side frames 4 shown by two-dot chain lines extending in the front-rear direction below the engine room 10 of the vehicle.
(However, only one side is shown) is formed. The front side frame 4 is configured such that a front frame inner 5 formed toward the inside of the trunk room 10 and a front frame outer 6 formed toward the outside have a box-shaped cross-sectional shape. It has a function as a shock absorbing member and a reinforcing member at the time of collision. An inner mounting bracket 102 is mounted on the front frame inner 5 of the front side frame 4 formed and arranged as described above, and an outer mounting bracket 103 is mounted on the front frame outer 6 by spot welding or the like. Have been. Each of the brackets 102 and 103 has a hole for mounting a bolt and nut 12, and a bumper reinforcement 113 serving as a mounting base of a front bumper is mounted using the bolt and nut 12. On the front surface of the bumper reinforcement 113, an outer cover formed by molding a soft resin or the like after interposing a cushion member made of a urethane resin or the like (not shown) is provided.

Next, in FIG. 6 (b), at the time of a frontal collision at a relatively high speed, a bumper reinforcement 1 is set.
The buckling of the front frame inner 5 of the front side frame 4 occurs when the 13 is deformed to the engine room side toward the center of the car. To prevent this, the inside of the inner mounting bracket 102 is reinforced. Member 111
Is further provided. With the above-described respective configurations, an attempt is made to absorb the impact at the time of a collision.

[0005]

However, in the configuration of the first example, the front frame inner 5 of the front side frame 4 is displaced by the bending of the bumper reinforcement 113 at the time of a light collision. There was a possibility of buckling deformation (shown by a dashed line) on the side. On the other hand, according to the configuration of the second example, since the reinforcing member 111 is further provided, buckling deformation of the front frame inner 5 of the front side frame 4 can be prevented, but this is an original function at the time of a strong collision. There is a possibility that the axial compression state of the entire front side frame 4 may be affected, and the balance of the axial compression mode set for absorbing the shock may be lost, and further safety measures are desired. Accordingly, the vehicle front body structure of the present invention has been made in view of the above-described problems, and has as its object to minimize vehicle body damage during low-speed collision and to achieve medium-speed collision. It is an object of the present invention to provide a front body structure of an automobile capable of absorbing shock at the time without any trouble.

[0006]

Means for Solving the Problems and

In order to solve the above-mentioned problems and achieve the object,
According to the present invention, a first bracket mounting portion joined to the right and left inward of the outer wall of the vehicle longitudinal direction extending pair of right and left front side frames front end of the automobile, the first
(1) An inner mounting bracket having a pampering reinforcement mounting flange that bends inward in the left-right direction of the vehicle from the front end of the bracket mounting portion, and is joined to an outer wall in the left-right direction of the vehicle at the front end of the front side frame.
A second bracket mounting portion, <br/> an outer mounting bracket inside and outside of the Freon side frames having Pampering reinforcement mounting flange portion bent from a distal end of the second bracket mounting portion outward in the left-right direction of the automobile A front vehicle body structure of an automobile configured by joining and mounting a bumper body to each of the mounting brackets, wherein the first bracket mounting portion of the inner mounting bracket and the second bracket of the outer mounting bracket. The length of the front side frame on both sides such that the mounting portion faces the position via the front side frame.
A joint bracket having a standing bent portion bent in the hand direction is prepared, and each of the front side surfaces is so arranged that the standing bent portion is joined to the first and second bracket mounting portions of each of the bracket mounting portions. By arranging the joint bracket inside the frame, in the event of a low-speed collision, the impact load applied to the inner mounting bracket is transmitted to the inner mounting bracket via the joint bracket to distribute the load and damage the vehicle body. In addition to minimizing the impact, in the event of a collision at medium speed or higher, the impact load applied to the inner mounting bracket and the outer mounting bracket is distributed via the joint bracket and received, and the shock absorption is maintained by maintaining the balance of the axial compression mode. We work without trouble.

Preferably, the rigidity of the inner mounting bracket is set to be greater than the rigidity of the outer mounting bracket, so that an impact load applied to the inner mounting bracket during a low-speed collision can be effectively applied to the inner mounting bracket. After receiving, it is transmitted to the inner mounting bracket via the joint bracket to distribute the load and minimize vehicle damage.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an exploded perspective view of a front body structure of an automobile according to an embodiment, showing a configuration example in which a front bumper 20 made of resin (urethane resin) is attached to the front of the automobile. Of course, the present invention can also be applied to the front bumper. FIG. 2 is a partially enlarged plan view of FIG. 1 and shows a state in which a joint bracket which is a feature of the present invention is provided.

In both figures, an engine room 1 of an automobile is shown.
A pair of left and right front side frames 4 extending in the front-rear direction are formed below and inside the zero. The front side frame 4 includes a front frame inner 5 formed toward the center inside of the engine room 10 and a front frame outer 6 formed toward the outside of the engine room 10 in a box shape. And has a function as a shock absorbing member and a reinforcing member at the time of a collision.

The inner mounting bracket 2 is provided at the front end of the front frame inner 5 of the front side frame 4 formed and arranged as described above, and the outer mounting bracket 3 is provided on the front frame outer 6 toward the outside of the vehicle. Each is joined by spot welding or the like via a joint bracket described later. Each of the brackets 2 and 3 is provided with a hole for mounting a bolt and nut 12 so that a bumper reinforcement 13 serving as a mounting base of the front bumper 20 can be mounted using the bolt and nut 12. Further, the condenser 11 for the air conditioner is provided between the front side frames 4 as shown in the figure to make it easy to receive the traveling wind.

Then, the bumper reinforcement 13
An outer cover 15 formed by molding a soft resin or the like with a cushion member 14 made of urethane foam resin or the like interposed therebetween is provided on a front surface of the outer cover 15. It is taken in the room. Next, FIG. 3 is a partially enlarged exploded perspective view of FIG. 1 and shows the configuration of the right front side frame 4 of FIG. 1. The left front side frame 4 is similarly configured. In this figure, a front frame inner 5 and a front frame outer 6 constituting the above-mentioned front side frame 4 are shown by two-dot chain lines in the figure, and the inner and outer mounting brackets 2 and 3 are spot welded together with the joint bracket 1. It shows that it is being done. The joint bracket 1 is formed by sheet metal press working in the same manner as the inner and outer mounting brackets 2 and 3 described above.
And a reinforcing portion 1c which connects the bent portion 1a at substantially the center of the main portion 1b is integrally formed. As shown, the joint bracket 1 thus formed is set at the position shown in the drawing through the front opening of the front side frame 4 and then spot-welded (1p) together with the inner and outer mounting brackets 2, 3. Is done.

The state of dispersion of the impact load at the time of the collision in the above-described configuration will be described with reference to the operation diagrams at the time of a low-speed collision of 5 miles / hour shown in FIG. 4 and at the time of a medium-speed collision shown in FIG. State. First, in FIG. 4, the impact load P1 at the time of a 5-mile collision is transmitted to the mounting surface 13a of the bumper reinforcement 13, transmitted to the inner mounting bracket 2 via the bolt and nut 12, and is mounted in the direction of arrow A1 in the drawing. When the bracket 2 is to be moved, the load in the direction of the arrow A1 is transmitted to the node bracket 1 in the direction of the arrow A2, and is also transmitted to the outer mounting bracket 3 via the front frame outer 6 of the front side frame 4. become. As a result, the impact load at the time of low speed is transmitted to each member, and the buckling deformation of the front frame inner 5 of the front side frame 4 is prevented.

Next, referring to FIG.
Impact load P at mid-speed collision of up to 35 miles / hour
2 and the load is bumper reinforcement 13
And transmitted to both the inner mounting bracket 2 and the outer mounting bracket 3 via the bolt and nut 12 to move the inner mounting bracket 2 and the outer mounting bracket 3 in the directions of arrows A1 and A3 in the figure. I do.
As a result, the loads in the directions of the arrows A1 and A3 act as the loads in the directions of the arrows A2 and A4 for compressing the joint bracket 1, but the front side frame 4 is mounted on the joint bracket 1 by the left-right balanced reinforcement by the joint bracket 1. It does not deform rearward in the axial compression direction as shown in the figure, and does not break the balance of the axial compression mode set for absorbing shock.

Therefore, by interposing the joint bracket in the front body structure of the automobile as described above, the damage to the vehicle body during a low-speed collision can be minimized, and the shock absorption during a medium-speed collision can be performed without any trouble. . Here, the invention of the present application is not limited to the configuration of the above-described embodiment, and it is needless to say that the setting can be appropriately changed without departing from the gist of the invention, and the invention is provided as a trunk room instead of the engine room. RR vehicles, wagon vehicles that do not have a dedicated engine room, etc., have a wide application range, and may be provided at the rear of the vehicle.

[0015]

According to the present invention as described above, according to the present invention, prior to
It is possible to provide a front vehicle body structure of an automobile that can minimize the vehicle body damage at the time of a low-speed collision and can absorb the shock at the time of a medium-speed collision without any trouble using only the side bumper .

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a front body structure of an automobile according to an embodiment.

FIG. 2 is a partially enlarged plan view of FIG. 1;

FIG. 3 is a partially enlarged external perspective view of FIG. 1;

FIG. 4 is an operation diagram at the time of a low-speed collision of 5 miles / hour.

FIG. 5 is an operation diagram at the time of a medium speed collision of 30 to 35 miles / hour.

FIG. 6A is a plan view of a first example of a conventional front body structure of an automobile, and FIG. 6B is a partially broken plan view of a second example.

[Explanation of symbols]

 1 bracket, 2 inner mounting bracket, 3 outer mounting bracket, 4 front side frame, 5 front frame inner, 6 front frame outer, 10 engine room, 13 bumper reinforcement.

Claims (2)

(57) [Claims] 1. A a first bracket mounting portion joined to the right and left inward of the outer wall of the vehicle longitudinal direction extending pair of right and left front side frames front end of the automobile, the first
An inner mounting bracket having a perforated reinforcement mounting flange that bends inward in the left-right direction of the vehicle from the tip of the bracket mounting portion; and, the second
The Freon side frame and an outer mounting bracket having a Pampering reinforcement mounting flange portion bent from the distal end of the second bracket mounting portion outward in the left-right direction of the automobile
A front body structure of an automobile configured by joining a bumper body to each of the mounting brackets on the inner and outer sides of the vehicle, wherein the first bracket mounting portion of the inner mounting bracket, and the outer mounting the front side frame on both sides such that the second bracket mounting portion of the bracket is positioned facing via the front side frame
A knot bracket having a standing bend portion bent so as to face the longitudinal direction of the arm , wherein the standing bend portion is provided on the first and second bracket mounting portions.
A front body structure for a motor vehicle, wherein the joint brackets are arranged inside the front side frames so as to be joined to a second bracket mounting portion. 2. The front body structure of an automobile according to claim 1, wherein the rigidity of the inner mounting bracket is set to be larger than the rigidity of the outer mounting bracket.