Robert Boschgmbh

Raymond Schuurman

Christof Ott

Werner Schmid

An electromagnetically controlled pressure regulating valve includes a hollow housing bounding a user channel having one end to be connected to a hydraulic medium user and another end, and respective supply and a discharge channels communicating with the interior of the housing between the ends, and at other end of the user channel, respectively. A closing member is mounted in the housing for movement toward and away from a closing position in which it sealingly separates the user channel from the discharge channel and is acted upon at the other end of the user channel by an armature with a variable combined force applied to the armature by an electrically energizable coil and by a return spring. A throttling device including at least two throttling orifices extending in fluid flow parallelism with one another between the supply and user channels and each having a length and a transverse dimension that are in a ratio of at least 2:1 is interposed between the supply and user channels.

Electromagnetically controlled seat valve

In a proposed electromagnetic pressure regulating valve (,), the functional characteristics of a pressure regulating valve are combined with those of a switching valve. The pressure regulating valve (,) can be used in particular to control automatic transmissions in motor vehicles and is characterized by reduced manufacturing costs, reduced leakage and an operating range which is expanded for reduced operating pressures and with a continuous characteristic line. For this purpose, the valve part (,) of the pressure regulating valve (,) has a first seat valve (,) with a closing element (,). This closing element (,) cooperates with an actuating element (,) which has a control edge (,) to form a second seat valve (,).

Growing community of inventors

Schwieberdingen, Germany

Raymond Schuurman