Patent ID: 8469416

Claim:
An impact absorbing device for a vehicle, the impact absorbing device made of aluminum alloy and configured to be provided between a bumper reinforcement extended in a vehicle width direction and a side member extended in a front-rear direction of the vehicle at an end portion of the bumper reinforcement, comprising: a cylindrical impact-absorbing portion including an inner wall surface extending smoothly in an axial direction, the impact-absorbing portion being configured to compressively deform in the axial direction for absorbing an impact energy; a first attaching portion closing an opening end of the impact-absorbing portion closer to the bumper reinforcement and configured to be attached to the bumper reinforcement; a second attaching portion extending from an opening end of the impact-absorbing portion closer to the side member and configured to be attached to the side member; a readily deformable portion provided at the impact-absorbing portion, the readily deformable portion formed by forming a plate thickness to be thinner in a partial range of the impact-absorbing portion in the axial direction; an initial peak load restraining portion provided at the first attaching portion and set to be away from the bumper reinforcement in the axial direction; and a rib provided on an outer surface of the impact-absorbing portion to project in the vehicle width direction and connected between the second attaching portion and a connecting portion of the impact-absorbing portion, the rib being formed to incline upwardly as positioned closer to an inner side in the vehicle width direction, wherein the cylindrical impact-absorbing portion, the first attaching portion, the second attaching portion, the readily deformable portion, the initial peak load restraining portion, and the rib are integrally formed.