Patent ID: 8276926

Claim:
A rear suspension spring support structure in which an upper end portion of a coil spring for a rear suspension is supported with a rear side member, wherein a rear cross member is connected to the rear side member with a rear cross member extension interposed therebetween, an extending portion, on a vehicle lateral side, of the rear cross member extension passes under the rear side member and extends to the vehicle lateral side of the rear side member, the extending portion of the rear cross member extension being welded to a lower surface of the rear side member and to a side surface, on the vehicle lateral side, of the rear side member, a coil spring bracket for receiving the upper end portion of the coil spring is joined to a lower surface of the rear cross member extension, the rear side member includes an outer sidewall on the vehicle lateral side, an inner sidewall on a vehicle center side, and a bottom wall, the rear cross member extension includes a front wall on a vehicle front side, a rear wall on a vehicle rear side, and a bottom wall, the extending portion is provided to the bottom wall of the rear cross member extension, the extending portion is welded to a lower surface of the bottom wall of the rear side member and to a side surface of the outer sidewall of the rear side member, a center of the coil spring bracket in a radial direction thereof is located near the inner sidewall of the rear side member, a coil spring reinforcement is laid between a side surface, on the vehicle center side, of the inner sidewall and an upper surface of the bottom wall of the rear cross member extension, an upper end portion of the coil spring reinforcement is welded to the side surface, on the vehicle center side, of the inner sidewall, a lower end portion of the coil spring reinforcement, the bottom wall of the rear cross member extension, and the coil spring bracket are integrally welded together, with the bottom wall of the rear cross member extension being sandwiched between the lower end portion of the coil spring reinforcement and the coil spring bracket, a lower end portion side of the coil spring reinforcement is located closer to the vehicle center side than an upper end portion side, the coil spring reinforcement, together with the inner sidewall of the rear side member and the bottom wall of the rear cross member extension, forms a closed triangular cross-section above the upper end portion of the coil spring, and a triangular prism-shaped space is formed by closing front and rear ends of the closed triangular cross-section with the front wall and the rear wall of the rear cross member extension.