Power assist steering gear assembly

摘要

Power assist steering gear assembly for vehicle comprises an elongated member linearly movable in opposite directions for pivoting of dirigible wheels. The elongated member comprises a rack portion formed at a first axial position and engaged with a pinion connected to a steering shaft and a thread portion formed at a second axial position and cooperating with a ball nut. The power assist steering unit further comprises an electric motor unit coaxially arranged about the elongated member at a third axial position and including an electric motor connected to the ball nut through rotation transmitting means to assist the linear movement of the elongated member.