The present invention relates to a vehicle-body front structure member, and more particularly relates to a vehicle-body front structure member that can arrange and support an auxiliary equipment at the front of a vehicle body of a vehicle such as an automobile.
In recent years, a vehicle-body frame member extending in a longitudinal direction of a vehicle body is connected to a vehicle-body front structure member in a vehicle such as an automobile, and various chassis members and auxiliary equipments are also fitted thereto.
Furthermore, to improve the collision safety characteristic of a vehicle, it has been required for the vehicle-body front structure member to absorb collision energy at the time of a frontal collision of the vehicle.
Under such circumstances, Japanese Patent Application Laid-open No. 2007-112212 relates to a vehicle-body frame structure and has such a configuration that a pair of collapsing portion 12b that are collapsed and deformed in a shape of a bellows at the time of a frontal collision are respectively provided at the end of a pair of front-side frames 12 provided on opposite sides in a vehicle width direction, a main frame unit 12a having a high cross-section strength is provided in a rear part that is continuous to the collapsing portion 12b, both the members 12b and 12a are made of materials of a different thickness, and a joint surface 12c of the members 12b and 12a is formed in a tapered shape retreating obliquely backward from the inside in the vehicle width direction toward outside. By having such a configuration, an impact load F at the time of a frontal collision first reaches the inside of the joint surface 12c. Therefore, an input load becomes unbalanced, to generate a bending moment in the main frame unit 12a, and impact energy is absorbed by bending deformation at that time. The pair of collapsing portion 12b are connected by a cross member 13.