SWING ARM FOR MINIATURIZED VEHICLE

摘要

A pair of left and right arm portions integrally formed by molding with a pivot portion formed on front ends and an axle support portion formed on rear ends. An opening portion with a peripheral portion endlessly contiguously formed by a pivot portion that connects front ends of both arm portions, a cross portion and both arm portions. A pair of left and right indented recessed portions is formed on an inner surface of a wall having support bosses projecting out of a lower surface of the wall. A pair of left and right reinforcing ribs that is positioned outside both recessed portions in the vehicle widthwise direction are integrally formed on the inner surface of the wall on which the support bosses is formed in a projecting manner toward the inside of the cross portion.