Patent ID: 7520514

Claim:
A body frame structure comprising: a front subframe that supports drive train parts including a power supply, steering system parts including a steering gear box, suspension system parts including a front suspension or an adjusting mechanism for adjusting a caster angle, and a car body, wherein the front subframe is formed substantially into a shape of parallel crosses or into a rectangular shape and which comprises: a front cross member, left and right front joint portions which are connected to left and right end portions of the front cross member, a left longitudinal member that extends rearwards from the left front joint portion, a right longitudinal member that extends rearwards from the right front joint portion, left and right rear joint portions which connect to distal ends of the left and right longitudinal members, respectively, and a rear cross member that connects to the left and right rear joint portions, wherein the left and right front joint portions are made of an aluminum alloy die-cast product, and wherein the steering gear box is supported on the rear cross member, the left and right rear joint portions and the rear cross member are formed integrally of an aluminum alloy die-cast product, and the left and right longitudinal members are made of an aluminum alloy wrought product, and wherein the left and right front joint portions, and the left and right rear joint portions define car body support portions where the front subframe supports the car body.