Patent ID: 8814250

Claim:
An automobile front portion structure for use with an automobile, the automobile front portion structure comprising: a crash box that is disposed between a front end of a front side member of the automobile and a front bumper reinforcement, and whose yield strength with respect to an axial compressive load is set to be less than that of the front side member; and a dilatant impact absorbing body that is formed of D3O™ and is disposed between the front end of the front side member and the front bumper reinforcement, a space for permitting axial compressive deformation of the crash box at a time of a front collision of the automobile being provided between the dilatant impact absorbing body and one of both, and a length dimension of the dilatant impact absorbing body in a vehicle longitudinal direction being set such that the dilatant impact absorbing body receives a compressive load between the both when an axial compressive deformation amount of the crash box becomes greater than or equal to a set value that is less than a maximum value of the axial compressive deformation amount, wherein the crash box is formed in a tubular shape whose front side member side is open, and the dilatant impact absorbing body is accommodated within the crash box and is fixed to a front end surface of the front side member, and the dilatant impact absorbing body is formed in a tubular shape that is substantially similar to a cross-sectional shape of a peripheral wall of the crash box, and is disposed coaxially to the peripheral wall, and a first length dimension of the dilatant impact absorbing body along the vehicle longitudinal direction is shorter than a second length dimension of the crash box along the vehicle longitudinal direction.