JP2007185982A - Front body structure of automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress damage to the side face of the other vehicle to the minimum in the case of a side impact to the other vehicle while securing safety performance against a collision of an own vehicle. <P>SOLUTION: A pair of impact absorbing parts 12a crushable by a load in the for-and-aft direction of a vehicle body are provided in front of a pair of front side frames 12 connected with a bumper beam 13, and a front cross member 18 is connected with the front end of the front side frame 12 through a pair of connection members 19 extending in the vertical direction rotatably around a fulcrum 16b at the front end of a sub-frame 15. Thus, the penetration of the bumper beam 13 or the front side frame 12 of the own vehicle into a cabin of the other vehicle can be suppressed to the minimum, by allowing the bumper beam 13 of the own vehicle to collide with a low stiffness door or a center pillar of the other vehicle to crush the impact absorbing part 12a, while allowing the front cross member 18 of the own vehicle to collide with the high stiffness side sill of the other vehicle at the time of the side impact. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention includes a pair of front side frames disposed in a vehicle front-rear direction, a bumper beam disposed in a vehicle width direction to which front ends of the pair of front side frames are coupled, and a lower portion of the pair of front side frames. A sub-frame to be disposed; a cross member disposed below the bumper beam in the vehicle width direction and connected to the front end of the sub-frame; and a front end of the pair of front side frames and both ends of the cross member in the vertical direction The present invention relates to a front body structure of an automobile including a pair of connecting members to be connected.

The front ends of the left and right upper stringers (front side frame of the present invention) are connected to the bumper, and the front ends of the left and right lower stringers (subframes of the present invention) arranged in parallel below the upper stringer are bumper Are connected to a horizontal beam (cross member of the present invention) arranged in parallel to the lower part of the upper part, the front end of the upper stringer and the front end of the lower stringer are connected by left and right connecting members extending in the vertical direction, and the lower stringer Patent Document 1 below discloses that the rear end of the vehicle is connected to the upper stringer with a low-rigidity connecting member so that the lower stringer is crushed and the collision load is absorbed when the vehicle collides.
Special table 2003-513856 gazette

  By the way, when the host vehicle having the above-described conventional vehicle body front structure collides with the side surface of another vehicle, the upper stringer having higher rigidity than the lower stringer is located higher than the side sill of the other vehicle. The upper stringer may collide with a low-rigidity door or center pillar of another vehicle and penetrate into the vehicle interior.

  The present invention has been made in view of the above-described circumstances, and it is an object of the present invention to minimize damage to the side face of another vehicle while ensuring the collision safety performance of the own vehicle at the time of collision with the side face of the other vehicle. .

  In order to achieve the above object, according to the first aspect of the present invention, a pair of front side frames disposed in the longitudinal direction of the vehicle body and a front end of the pair of front side frames disposed in the vehicle width direction are provided. A bumper beam to be coupled; a subframe disposed below the pair of front side frames; a cross member disposed below the bumper beam in the vehicle width direction and coupled to the front end of the subframe; In the front body structure of an automobile comprising a front end of the front side frame and a pair of connecting members for vertically connecting both ends of the cross member, the front portions of the pair of front side frames are crushed by a load in the front and rear direction of the body A pair of possible shock absorbers are provided, and the cross member extends in the vehicle width direction at the front end of the subframe. Front body structure for an automobile, which comprises pivotally connected is proposed around.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect, a bead that can be crushed by a load in the longitudinal direction of the vehicle body is formed on the upper part of the pair of connecting members. A front body structure is proposed.

  The front cross member 18 of the embodiment corresponds to the cross member of the present invention.

  According to the configuration of the first aspect, the front portion of the pair of front side frames connected to the bumper beam is provided with the pair of shock absorbing portions that can be crushed by a load in the longitudinal direction of the vehicle body, and at the front end of the front side frame in the vertical direction. The cross member connected via a pair of connecting members extending in the direction of the vehicle is connected to the front end of the subframe so as to be rotatable about an axis extending in the vehicle width direction. While colliding with the rigid side sill of another vehicle and absorbing the impact, colliding the bumper beam of the own vehicle with the low-rigidity door or center pillar of the other vehicle and crushing the shock absorbing part of the front side frame, It is possible to minimize the bumper beam and the front side frame of the host vehicle from penetrating into the passenger compartment of the other vehicle.

  According to the second aspect of the present invention, the bead that can be crushed by the load in the longitudinal direction of the vehicle body is formed on the upper part of the pair of connecting members. The crushing of the absorption part can be promoted, and the bumper beam and the front side frame can be more reliably prevented from penetrating into the cabin of another vehicle.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  1 to 5 show an embodiment of the present invention. FIG. 1 is a perspective view showing a skeleton of a front portion of a vehicle body of an automobile, FIG. 2 is a view taken in the direction of the arrow in FIG. 1, and FIG. FIG. 4 is an enlarged sectional view taken along line 3-3, FIG. 4 is an enlarged sectional view taken along line 4-4 of FIG. 1, and FIG.

  As shown in FIGS. 1 and 2, left and right front side frames 12 and 12 extending in the longitudinal direction of the vehicle body are disposed along the left and right sides of an engine room 11 formed at the front of the vehicle body. The front ends of the side frames 12, 12 are connected by bolts 14 to the rear surface of the bumper beam 13 extending in the vehicle width direction. A subframe 15 that supports an unillustrated engine and front wheel suspension includes left and right subframe bodies 16 and 16 extending in the longitudinal direction of the vehicle body, and a rear cross member 17 that connects the rear ends thereof in the vehicle width direction. The front ends of the left and right subframe bodies 16, 16 are connected to a front cross member 18 extending in the vehicle width direction. The front ends of the left and right front side frames 12 and 12 are connected to both ends of the front cross member 18 by left and right connecting members 19 and 19 extending in the vertical direction. The bumper beam 13, the front cross member 18 and the left and right connecting members 19, 19 form a rectangular frame at the front of the vehicle body. The height of the front cross member 18 substantially matches the height of the side sill of a general vehicle.

  The front portions of the left and right front side frames 12 and 12, that is, the portions connected to the bumper beams 13 and the upper ends of the left and right connecting members 19 and 19 are shock-absorbing portions 12a, which can be easily crushed compared to the rear portions. 12a is constituted by another member and is integrally coupled to the rear portion by bolts 20.

  As apparent from FIG. 3, only the upper plates 16a, 16a protrude forward from the front ends of the subframe bodies 16, 16 having a rectangular cross-section box structure, and the upper plates 16a, 16a have a rectangular cross-section. The front cross member 18 is welded to the upper surface. Therefore, when a load from the front of the vehicle body is input, the front cross member 18 and the left and right connecting members 19 and 19 can be united and can be rotated rearward of the vehicle body using the base portions of the upper plates 16a and 16a as fulcrums 16b and 16b. It is.

  As is clear from FIG. 2 and FIG. 4, in the upper part of the left and right connecting members 19, 19 having a box structure with a rectangular cross section, that is, in the vicinity of the portion connected to the bumper beam 13 and the left and right front side frames 12, 12, A plurality of long and short beads 19a extending in the vertical direction are formed in parallel.

  The left and right subframe bodies 16 and 16, the front cross member 18, the left and right connecting members 19 and 19, the shock absorbing portions 12a and 12a of the left and right front side frames 12 and 12, and the bumper beam 13 are assembled in advance as subassemblies. The shock absorbing parts 12a, 12a are fastened to the main body parts of the left and right front side frames 12, 12 with bolts 20 ..., and the sub-frame main bodies 16, 16 are fastened to the rear cross member 17 with bolts 25, 25. It is mounted on the car body.

  Next, the operation of the embodiment of the present invention having the above configuration will be described.

  The vehicle body front structure of the vehicle according to the present embodiment includes a bumper beam 13 connected to the front ends of the left and right front side frames 12, 12, a front cross member 18 connected to the front end of the subframe 15, Since the frame-like structure formed by the connecting members 19 and 19 is provided, the collision load can be received by the frame-like structure at the time of collision with another vehicle, and the collision load can be achieved only with the conventional bumper beam. The load input point is lower than when receiving the load.

  That is, in the conventional vehicle body front structure, as shown in FIG. 6, when the own vehicle collides with the side surface of the other vehicle, the bumper beam 13 of the own vehicle is positioned higher than the side sill 23 of the other vehicle. The beam 13 collides with the door 21 and the center pillar 22 of the other vehicle. At this time, since the front side frames 12 and 12 have relatively high rigidity, the door 21 and the center pillar 22 of another vehicle having relatively low rigidity may be greatly deformed.

  On the other hand, in the vehicle body front part structure of the present embodiment, as shown in FIG. 5, when the own vehicle collides with the side surface of the other vehicle, the bumper beam 13 of the own vehicle is applied to the door 21 and the center pillar 22 of the other vehicle. Almost simultaneously with the collision, the front cross member 18 of the host vehicle collides with the side sill 23 of the other vehicle. At this time, the side sill 23 and the floor frame 24 of the other vehicle that collide with the front cross member 18 of the host vehicle are higher in rigidity than the door 21 and the center pillar 22, so that they are not greatly deformed during the collision.

  Further, even if the bumper beam 13 of the own vehicle collides with the door 21 and the center pillar 22 of another vehicle, as shown in FIG. 2B, the shock absorbing portions of the front side frames 12 and 12 that are continuous with the rear surface of the bumper beam 13 12a and 12a are easily crushed by the load input from the other vehicle, so that the door 21 and the center pillar 22 are not greatly deformed toward the vehicle interior, and the safety of passengers of the other vehicle is ensured.

  At this time, as shown in FIG. 2B, the upper plates 16a, 16a of the front ends of the left and right subframe bodies 16, 16 of the subframe 15 are easily bent at the fulcrums 16b, 16b, and the front cross member 18 is By rotating backward together with the connecting members 19, 19, the crushing of the impact absorbing portions 12 a, 12 a of the front side frames 12, 12 is promoted. Further, as shown in FIGS. 2B and 4, the upper portions of the left and right connecting members 19, 19 are easily crushed in the front-rear direction by the action of the beads 19 a, and the shock absorbing portions 12 a of the front side frames 12, 12. , 12a is further promoted.

  As described above, when the host vehicle collides with another vehicle in a side surface, the front part of the bumper beam 13 and the front side frames 12 and 12 of the host vehicle is minimized to penetrate into the vehicle interior of the other vehicle. Can do. Further, even if the rigidity of the front side frames 12 and 12 is reduced by providing the shock absorbing parts 12a and 12a, the highly rigid front cross member 18 and the sub frame 15 support the collision load. Collision safety is also sufficiently secured.

  Further, since the bumper beam 13, the front cross member 18 and the left and right connecting members 19 and 19 form a rectangular frame, the load input to the bumper beam 13 due to the collision is distributed to the subframe 15 via the frame. As a result, it is possible to compensate for a decrease in the shock absorbing capability due to the provision of the shock absorbing portions 12a, 12a, and to sufficiently ensure the collision safety at the time of the frontal collision.

  The embodiments of the present invention have been described above, but various design changes can be made without departing from the scope of the present invention.

  For example, in the embodiment, the means for rotatably connecting the front cross member 19 to the front end of the subframe 15 is constituted by the fulcrums 16b and 16b of the upper plates 16a and 16a of the subframe bodies 16 and 16. The structure of the pivotally connecting means is arbitrary.

Perspective view showing the skeleton of the front part of the vehicle body 2 direction view of FIG. 3-3 enlarged sectional view of FIG. 4-4 enlarged cross-sectional view of FIG. Action explanatory diagram at the time of collision with other vehicles Action explanatory diagram at the time of collision with other vehicles according to the conventional example

Explanation of symbols

12 Front side frame 12a Shock absorber 13 Bumper beam 15 Subframe 18 Front cross member (cross member)
19 Connecting member 19a Bead

Claims (2)

A pair of front side frames (12) arranged in the longitudinal direction of the vehicle body;
A bumper beam (13) disposed in the vehicle width direction and connected to the front ends of the pair of front side frames (12);
A subframe (15) disposed below the pair of front side frames (12);
A cross member (18) disposed in the vehicle width direction below the bumper beam (13) and connected to the front end of the subframe (15);
A pair of connecting members (19) for vertically connecting the front ends of the pair of front side frames (12) and both ends of the cross member (18);
In the front body structure of an automobile comprising
A pair of impact absorbing portions (12a) that can be crushed by a load in the longitudinal direction of the vehicle body are provided at the front portions of the pair of front side frames (12), and the cross member (18) is disposed at the front end of the subframe (15). A front body structure of an automobile, wherein the front body structure is connected to be rotatable about an axis extending in a vehicle width direction. The front body structure of an automobile according to claim 1, wherein a bead (19a) that can be crushed by a load in the longitudinal direction of the vehicle body is formed on the upper portion of the pair of connecting members (19).

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