Power steering apparatus (US Patent 4339986)

Patent number: 4339986 Granted: 1982-07-20 Filed: 1980-04-17 Inventors: Rupert L. Atkin (St. Clair Shores, MI, US) Assignees: TRW Inc. (Cleveland, OH, US)

Abstract

An improved a power steering apparatus includes a fluid motor which is connected with a steerable vehicle wheel by a rack gear. The fluid motor has a piston with a relatively large head end surface area and a relatively small rod end surface area. In order to compensate for the difference in the head and rod end surface areas, actuation of a steering control valve assembly is