Automatic transmission having a pressure regulator with flow force compensation

摘要

An automatic transmission (10) having a pressure regulator (100) with flow force compensation. The pressure regulator (100) includes a valve body (110) having a valve bore (112) and at least one inlet (120) and at least one outlet (124) adapted to provide fluid communication with a source of pressurized hydraulic fluid and a return to the source of pressure. A valve member (130) is slidingly disposed within the valve body (110) that includes at least one valve element (136) having an outer diameter (186) and a metering face (188). The metering face (188) is adapted to control the flow of pressurized hydraulic fluid between the inlet (120) and the outlet (124) of the valve body (110). The metering face (188) includes a flow force compensating annular void (190) disposed adjacent to the outer diameter (124) that is defined by a lead angle a measured between the outer diameter (186) and a line intersecting the outer diameter (186) and tangential to the annular void (190).