To reduce weight while absorbing impact energy by constituting a vehicular shock absorber of a cylindrical frame member being formed by extrusion molding of an aluminum alloy and having a partition wall for partitioning the inside space by being extended in the extruding direction and an elastic foaming body arranged in isolated chambers partitioned by the partition wall.
A shock absorber used for a front side bumper of a vehicle is constituted by using a cylindrical frame member 1 being formed in a cylindrical shape and having a partition wall 11 for partitioning the inside space into a front isolated chamber 12 and a rear isolated chamber 13 and an elastic foaming body 2 filled/arranged in the front isolated chamber 12 and the rear isolated chamber 13 as a main element. The cylindrical frame member 1 is formed in a cylindrical shape by extrusion molding of an aluminum alloy, and has a single partition wall 11 for partitioning the inside space into the front isolated chamber 12 and the rear isolated chamber 13 by being extended in the extruding direction. A slit formed in the extruding direction at extrusion molding time is provided in a central part of this partition wall 11, and the front isolated chamber 12 and the rear isolated chamber 13 are communicated by this slit.
MAENO HAJIME
IKAGA SHUJI
ENOMOTO MASATOSHI
SATO SHOICHI
SHOWA ALUMINUM CORP
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