US Patent 7722063 Vehicle suspension system

A suspension system for a tilting vehicular chassis based on more than three wheels separates a tilting component of the chassis from a non-tilting component. The non-tilting component provides a means for powering the vehicle with automotive-type engine and drive train options, while the tilting component provides the turning stability necessary for a narrower wheel base. The narrower wheel base benefits fuel economy. The multiplicity of wheels, and the breadth of platform thus enabled, permits shelter and comfort features for the occupant not otherwise available on a typical two-wheel chassis.