Solenoid operated pressure control valve for automatic gearbox clutch

摘要

The solenoid operated valve can be connected in an hydraulic circuit between a utiliser and a source of fluid under pressure for controlling the supply to the utiliser (3). It includes a spool (11) which is movable against the action of resilient device (43) and is provided with a first active surface (40) sensitive to the pressure in a control chamber (27) provided with an inlet (41) and an outlet (24) for a control fluid. - The outlet (24) from the control chamber (27) is provided with an electrically controlled valve member (20) and the spool (11) has a second active surface (44) opposite the first (40) and sensitive to the pressure in a reaction chamber (28) connected (via a passage (145)) to a first duct (7) communicating with an automatic gearbox. The spool (11) is operable to put the first duct (7) in communication with a second duct (8) or a third duct (6) respectively connected to a discharge reservoir and to the source. (2/4) GBAB- GB2102158 B The solenoid operated valve can be connected in an hydraulic circuit between a utiliser and a source of fluid under pressure for controlling the supply to the utiliser (3). It includes a spool (11) which is movable against the action of resilient device (43) and is provided with a first active surface (40) sensitive to the pressure in a control chamber (27) provided with an inlet (41) and an outlet (24) for a control fluid. - The outlet (24) from the control chamber (27) is provided with an electrically controlled valve member (20) and the spool (11) has a second active surface (44) opposite the first (40) and sensitive to the pressure in a reaction chamber (28) connected (via a passage (145)) to a first duct (7) communicating with an automatic gearbox. The spool (11) is operable to put the first duct (7) in communication with a second duct (8) or a third duct (6) respectively connected to a discharge reservoir and to the source. (6pp Dwg.No.2/4)