Patent ID: 7114429

Claim:
A power steering assembly, comprising: a housing having an axis extending between opposite ends, and a cavity being defined between the ends; a valve in fluid communication with the cavity and being operable to direct fluid under pressure to selected locations within the cavity; a drive member extending axially in the cavity; a driven shaft extending laterally in the cavity and operably associated with the drive member to be driven in response to movement of the drive member; and a first piston and a second piston received in the cavity for axial reciprocation, the first piston reciprocating in the cavity at least in part in response to rotational movement of the drive member, the first and second pistons having opposite sides defining at least in part a first pair of chambers and a second pair of chambers, the first pair of chambers receiving fluid under pressure through the valve to move the first and second pistons toward one end of the housing and causing the driven shaft to rotate in a first direction, the second pair of chambers receiving fluid under pressure through the valve to move the first and second pistons toward the other end of the housing and causing the driven shaft to rotate in a second direction opposite the first direction.