| 摘要 |
PURPOSE:To reduce the weight of a bumper, that is, the weight of a car in the end so as to improve fuel consumption while the performance of the bumper is being maintained by reducing the weight of the bumper with a help of decreasing an amount of foamed resin used in the center section of a shock absorbing unit and of making a backup beam out of fiber reinforced synthetic resin. CONSTITUTION:A shock absorbing unit 3 made of foamed synthetic resin is fitted on the outer surface of a backup beam 2 which is connected with a right and a left stay B of a car body A, and the outer surface and the upper and lower surfaces of these members are covered with an outer skin 4 in a form of a roughly U shape cross section. And the backup beam 2 is made of fiber reinforced synthetic resin, is made deep in depth in a range between both of the stays B and is made shallow in depth from a stay connecting point 10 to a beam end 2b while the beam is made hollow. On the other hand, the change in depth of the shock absorbing unit 3 is made opposite to that of the backup beam 2 and is made approximately constant. This constitution can reduce the weight of the bumper, that is, the weight of the car in the end and can improve fuel consumption thereby while the performance of a shock absorbing bumper 1 is being maintained.
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