The document summarizes a patent for a suspension system for motor vehicles. It describes an auxiliary frame that supports the axle and is detachably mounted to the vehicle body. The auxiliary frame consists of sleeves surrounding torsion bar springs, stays connecting the sleeves, and struts connected to the sleeves. When mounted to the vehicle body, the auxiliary frame and body form a rigid frame system that takes up stresses from the axle. The auxiliary frame attaches to the vehicle body at four widely spaced points, distributing stresses over a large surface area of the body.