Patent ID: 7044261

Claim:
An apparatus for turning steerable wheels of a vehicle, the apparatus comprising: a housing defining a fluid chamber; a rack bar extending longitudinally through the housing and being connectable with the steerable wheels of the vehicle, the rack bar being movable relative to the housing for moving the steerable wheels; a piston assembly fixedly attached to the rack bar and sealingly engaging the housing, the piston assembly dividing the fluid chamber into first and second chamber portions; and a fluid source for directing fluid toward one of the first and second chamber portions for creating a differential pressure between the first and second chamber portions, the piston assembly and the rack bar moving relative to the housing in response to the differential pressure, the piston assembly including a fluid seal sealingly engaging said housing, a chamber exposed to fluid in said first and second chamber portions, and structure for dampening fluid pulsations emanating from the fluid source.