JP3959951B2 - Front body structure of the vehicle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a front body structure of a vehicle provided with a bumper at a lower front portion of a bonnet extending forward.
[0002]
[Prior art]
The front body structure of the vehicle absorbs the impact acting on the vehicle body when it collides with an obstacle (such as a pedestrian) to protect the occupant and also absorbs the impact acting on the impacted obstacle. Must be configured to protect.
[0003]
As such a front body structure of a vehicle, Japanese Patent Laid-Open No. 6-72284 discloses an airbag that is housed in a front end portion of a vehicle and that is deployed in a vehicle traveling direction, deployment drive means that deploys and drives the airbag, Vehicle front obstacle detection means for detecting an obstacle, vehicle running state detection means for detecting the running state of the vehicle, and vehicle front obstacles based on outputs of the vehicle forward obstacle detection means and the vehicle running state detection means. According to this configuration, the collision prediction unit is a pedestrian based on the outputs of the vehicle front obstacle detection unit and the vehicle running state detection unit. The collision risk with the obstacle ahead of the vehicle such as a bicycle is judged to predict the collision with the obstacle, and when the collision with the obstacle ahead of the vehicle is predicted, the deployment drive means is excited to advance the vehicle. In the direction Expand airbag, whereby the pedestrian, bicycle or the like has been described the contents of the can to protect them can be prevented from being caught in the lower part of the vehicle body or in contact with the vehicle body directly. However, in such a configuration, since an airbag, a large number of detection devices, and a control system are necessary, the structure is complicated and a malfunction may occur.
[0004]
Japanese Patent Application Laid-Open No. 11-1149 discloses a vehicle bumper in which an impact absorbing material is disposed between an amateur (bumper reinforcement) and a fascia (bumper face). In the center of the direction, a stepped surface is cut to form a split surface perpendicular to the pressure-receiving direction, and a plate member having ribs substantially along the longitudinal direction is interposed in the split surface of the shock absorber and the shock absorber According to such a configuration, the impact load applied locally to the bumper at the time of collision is the total length of the plate member with respect to the longitudinal direction of the amateur (bumper reinforcement). The bumper armature (bumper reinforcement) can be prevented from breaking at the time of collision. Because it is reinforced by ribs substantially along the direction, it is possible to reduce the weight while ensuring the strength as compared with conventional over-rider, the contents of the have been described. However, in this configuration, no consideration is given to absorbing and protecting the impact applied to the impacted obstacle.
[0005]
[Problems to be solved by the invention]
The object of the present application is to ensure that an obstacle is placed on a hood when it collides with an obstacle and absorbs an impact acting on the obstacle so that damage to the obstacle can be suppressed to a small level. It is in providing a partial vehicle body structure.
[0006]
[Means for Solving the Problems]
The present invention attaches a projecting member to the front part of the left and right front side frames via a stay so that the tip projects forward from the vehicle width direction member at the lower part of the bumper, and the front part is connected to the projecting member on the stay. An energy absorbing portion to be provided is provided.
[0007]
Specifically, the present invention provides:
A vehicle front body structure having a vehicle width direction member provided with a bumper at a front lower part of a bonnet extending forward , and the bumper attached to front ends of left and right front side frames ,
The vehicle width direction member is composed of a crash can attached to the front ends of each of the left and right front side frames to absorb the impact at the time of a collision, and a member installed at the front ends of the left and right crash cans. And
At the lower part of the bumper, a projecting member whose tip projects forward from the vehicle width direction member is attached to each front part of the left and right front side frames via a stay,
Each stay includes an energy absorbing portion whose front portion is connected to the projecting member , and an attachment portion attached to the member to which the upper portion of the energy absorbing portion is connected to the crash can. It is characterized by being.
[0008]
In the present invention, the energy absorbing portion may be formed of a bellows-shaped plate material in which irregularities are alternately arranged in the front-rear direction.
[0009]
In the present invention, the upper end of each stay is sandwiched between the front end of the front side frame and the crash can, and the front side frame side and the member side straddle the crash can. It may be attached.
[0010]
【The invention's effect】
As described above, according to the present invention, when the front part of the vehicle collides with an obstacle, the projecting member first hits the lower part of the obstacle and tilts the obstacle to the vehicle body side, and then obliquely behind the projecting member. Since the positioned vehicle width direction member hits the obstacle tilted to the vehicle body side, the obstacle is surely placed on the hood, and the projecting member is connected to the energy absorbing part of the stay, Since the energy absorbing portion absorbs the impact at the time of the collision, the load acting on the obstacle from the protruding member is reduced, and as a result, the damage given to the obstacle can be kept extremely small. Moreover, the safety | security improvement at the time of a collision can be achieved by simple structure of providing an energy absorption part in the stay for attaching a protrusion member.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0012]
FIG. 1 shows a front body structure of a vehicle according to an embodiment of the present invention.
[0013]
In this front body structure, a bonnet 1 that extends in front of a windshield (not shown) and covers the engine room, a grill 2 that extends downward following the front end of the bonnet 1 and forms the front of the vehicle, and a front that follows the lower end of the grill 2 A vehicle outer surface portion is constituted by a bumper face 3 composed of an upper protruding portion 3a protruding downward and a lower protruding portion 3b below the upper protruding portion 3a. Reference numeral T denotes a front tire. A bonnet reinforcement 4 for reinforcing the bonnet 1 is provided on the front side of the hood 1 at the engine room side.
[0014]
As shown in FIGS. 1 and 2, the rear protrusion of the upper protruding portion 3a of the bumper face 3 has a quadrangular frustum-shaped crash can 6, which absorbs shocks at the time of collision at the front ends of the left and right front side frames 5, 5. 6 is attached by bolts and nuts, and a support member 7 is attached by bolts to the front ends of the crash cans 6, and both ends of the bumper reinforcement 8 extending in the vehicle width direction are supported by the left and right support members 7,7. It has become. Here, the crash cans 6 and 6, the support members 7 and 7, and the bumper reinforcement 8 constitute a vehicle width direction member. In the front vehicle body structure, as shown in FIG. 1, a shock absorbing material 9 made of urethane foam is attached to the front surface of the bumper reinforcement 8, and the shock absorbing material 9 is the upper protruding portion 3 a of the bumper face 3. It is the composition arranged behind.
[0015]
As shown in FIGS. 1 to 3, the rear projection of the lower protrusion 3 b of the bumper face 3 has stays 10 and 10 fixedly attached to the lower portions of the left and right front side frames 5 and 5 and the lower portions of the support members 7 and 7. In addition, the protruding members 11 extending in the vehicle width direction are supported by the stays 10 and 10. The stay 10 is formed of a metal plate, and as shown in FIG. 4, a main body 10a inclined forward and downward, a pair of first mounting portions 10b and 10b extending upward from both upper end sides of the main body 10a, and a main body A pair of side plate portions 10c, 10c extending upward from both sides of the portion 10a, second mounting portions 10d, 10d extending outwardly by bending at the upper ends of the side plate portions 10c, 10c, and forward from the lower end of the main body portion 10a. And an energy absorbing portion 10e having a U-shaped cross section formed in a bellows shape in which irregularities are alternately extended in the front-rear direction. As shown in FIG. 3, the stay 10 has the first attachment portions 10 b and 10 b sandwiched between the attachment plate portion 6 a of the crash can 6 and the front end plate portion 5 a of the front side frame 5 and the front end of the front side frame 5. The bolts 12, 12 passed from the rear surface side of the plate portion 5a are inserted into the bolt insertion holes 10f, 10f,... Of the first attachment portions 10b, 10b, and are attached by nuts 13, 13 on the front surface side of the attachment plate portion 6a of the crash can 6. The second mounting portions 10d, 10d are fixedly attached to the vehicle body by welding, bolting, or the like at the lower portion of the support member 7. The protruding member 11 is attached to the stay 10 by welding, bolting, or the like at the tip of the energy absorbing portion 10e. In the front vehicle body structure, as shown in FIG. 1, the protruding member 11 is arranged behind the lower protruding portion 3 b of the bumper face 3. Further, the protruding member 11 is disposed so as to protrude forward from the bumper reinforcement 8.
[0016]
According to the front body structure of the above configuration, when the front part of the vehicle collides with an obstacle, the projecting member 11 first hits the lower part of the obstacle via the lower projecting part 3b of the bumper face 3, and the obstacle is on the vehicle body side. Will be inclined to. At this time, the bellows-shaped energy absorbing portion 10e is easily compressed and the projecting member 11 moves rearward, thereby effectively absorbing the shock acting on the obstacle, and acting on the obstacle from the protruding member. The load will be reduced. At the same time, the impact absorbing material 9 also hits the obstacle through the upper protruding portion 3a of the bumper face 3. However, since the shock absorbing material 9 is formed of a foamed urethane resin that can be easily compressed, The influence of the force acting on it is small. Next, when the shock absorbing material 9 is sufficiently compressed, the bumper reinforcement 8 hits an obstacle through the compressed shock absorbing material 9 and the upper protruding portion 3a of the bumper face 3, and the obstacle tilted to the vehicle body side. The object is surely placed on the bonnet 1. In this way, the damage given to the obstacle is kept very small.
[0017]
Moreover, the safety | security improvement at the time of a collision will be achieved by simple structure of providing the energy absorption part 10e in the stay 10 for attaching the protrusion member 11. FIG.
[0018]
Further, in the stay 10, the first mounting portions 10b and 10b are sandwiched between the front end plate portion 5a of the front side frame 5 and the mounting plate portion 6a of the crash can 6, and the second mounting portions 10d and 10d are supported by the support member 7. Since it is attached and fixed to the vehicle body by being welded to the lower part of the first side, the first attachment portions 10b and 10b are also attached and fixed together when the crash can 6 is attached to the front side frame 5. Since a special member for attachment is not required, attachment of the stay 10 to the vehicle body is easy and inexpensive.
[Brief description of the drawings]
FIG. 1 is a side view showing a front body structure of a vehicle according to an embodiment of the present invention.
FIG. 2 is a perspective view of a main part of FIG.
FIG. 3 is an enlarged side view of a main part of FIG. 1;
FIG. 4 is a perspective view of a stay used in the front body structure of the vehicle according to the embodiment of the present invention.
[Explanation of symbols]
1 Bonnet 2 Grill 3 Bumper Face 3a Upper Projection 3b Lower Projection 4 Bonnet Reinforcement 5 Front Side Frame 5a Front End Plate 6 Crash Can 6a Mounting Plate 7 Support Member 8 Bumper Reinforcement 9 Shock Absorber 10 Stay 10a body portion 10b first mounting portion 10c side plate portion 10d second mounting portion 10e energy absorbing portion 10f bolt insertion hole 11 projecting member 12 bolt 13 nut T front tire

Claims (3)

A vehicle front body structure having a vehicle width direction member provided with a bumper at a front lower part of a bonnet extending forward , and the bumper attached to front ends of left and right front side frames ,
The vehicle width direction member is composed of a crash can attached to the front ends of each of the left and right front side frames to absorb the impact at the time of a collision, and a member installed at the front ends of the left and right crash cans. And
At the lower part of the bumper, a projecting member whose tip projects forward from the vehicle width direction member is attached to each front part of the left and right front side frames via a stay,
Each stay includes an energy absorbing portion whose front portion is connected to the projecting member , and an attachment portion attached to the member to which the upper portion of the energy absorbing portion is connected to the crash can. The vehicle body structure of the front part of the vehicle characterized by the above-mentioned .   2. The front body structure of a vehicle according to claim 1, wherein the energy absorbing portion is formed of a bellows-shaped plate material in which irregularities are alternately arranged in the front-rear direction. Each stay, the rear end portion of the upper is sandwiched between the front end and the crash cans of the front side frame, are attached to the above front side frame side and the member-side across the crush cans The front body structure of a vehicle according to claim 1 or 2, characterized in that

Images