PROPORTIONAL PRESSURE CONTROL VALVE COMPRISING A PRESSURE JUMP IN THE CHARACTERISTIC P/I CURVE THEREOF

摘要

The invention relates to an electromagnetic proportional pressure control valve (1) in a vehicle transmission, comprising at least one magnet part (2), a hydraulic part (3), and a springy element (4) in the effective connection between the magnet part (2) and the hydraulic part (3). The magnet part (2) is composed at least of a coil (5), an armature (6), and an armature bar (7) while the hydraulic part (3) is composed at least of a first and a second closing element (8, 9). The first closing element (8) preferably forms a flat seat (10) while the second closing element (9) forms a ball seat (11). The closing elements (8, 9) are opened and/or closed by means of a tappet rod (12). According to the invention, the second closing element (9) is closed in the unpowered state of the valve (1) while an overlap (ü) is larger than one seventh of a nominal width (NW) of the valve (1). Moreover, the second closing area (A_2) is greater than a circular area whose diameter corresponds to twice the overlap while the diameter (s) of the tappet rod (12) is less than 0.7 times the diameter (b) of the orifice (21).