| 摘要 |
PURPOSE: A bumper back beam is provided to form marginal spaces by installing a stiffener of curvature smaller than the back beam in the internal space of the back beam so that an allowable impact capacity is increased. CONSTITUTION: A bumper back beam(100) comprises a stiffener received in an internal space(55) of an impact unit(50). The internal space and the stiffener have curvature smaller than the curvature of the back beam. Marginal spaces are formed in both sides in a gap between the internal space and the stiffener. Both end faces of the stiffener are formed in parallel to a crush box and extended to a tower unit. The stiffener is mounted while in the state of surface-contacting to the crush box. A plurality of ribs are installed in the stiffener or the back beam and filled in the marginal spaces.
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