Bumper beam for automobile, method for manufacturing bumper beam, and structure for mounting bumper beam in vehicle body

A structure for mounting a bumper beam to a vehicle body, the structure comprising:

• a mounting hole formed at the flange portion of the bumper beam which comprises:
• a bumper beam body that has an elongated body disposed along the vehicle widthwise direction and a U-shaped cross section an inside of which is opened toward a vehicle inner side in a vehicle rear-front direction, an upper edge and a lower edge of the U-shaped cross section extending outward from the bumper beam body, thereby forming a flange portion, said bumper beam body and said flange portion thereof each containing a continuous fiber reinforced polymer layer;
• and a first flange tip portion that is made of thermoplastic resin and provided to the upper edge and the lower edge of the flange portion such that the first flange tip portion covers the upper edge and the lower edge, the first flange tip portion extending from the upper edge or the lower edge outward in a vertical direction and then curving outward in the vehicle rear-front direction, thereby forming an L-shaped cross section;
• a body frame member of the vehicle body;
• a flanged collar integrally having a collar flange that is fitted in the mounting hole of said flange portion of the bumper beam from the vehicle inner side in the vehicle rear-front direction;
• a flanged bolt integrally having a bolt flange that is caused to penetrate said flanged collar from a vehicle outer side in the vehicle rear-front direction and fastened to said body frame member;
• and
• an elastic member interposed between said bolt flange of said flanged bolt and said flange portion of said bumper beam on the vehicle outer side in the rear-front direction.