Abstract: An electromagnetic adjusting device for automatic transmissions of motor vehicles has an electromagnet having a magnetic coil, a substantially cup-shaped housing which surrounds the magnetic coil and is composed of a ferromagnetic material, the housing having a housing bottom, a ferromagnetic central part which extends from the housing bottom and supports the magnetic coil, and a movable armature located before the central part and leaving a working air gap so as to form with the housing and the central part a magnetic circuit which has a magnetic resistance for a magnetic flux, and means for changing the magnetic resistance, the means for changing the magnetic resistance including an axial depression provided in the central part and an axially displaceable ferromagnetic filling member inserted in the depression and limiting with a bottom of the depression an auxiliary air gap.

Abstract: An electromagnetic adjusting device for automatic transmissions of motor vehicles has an electromagnet having a magnetic coil, a substantially cup-shaped housing which surrounds the magnetic coil and is composed of a ferromagnetic material, the housing having a housing bottom, a ferromagnetic central part which extends from the housing bottom and supports the magnetic coil, and a movable armature located before the central part and leaving a working air gap so as to form with the housing and the central part a magnetic circuit which has a magnetic resistance for a magnetic flux, and means for changing the magnetic resistance, the means for changing the magnetic resistance including an axial depression provided in the central part and an axially displaceable ferromagnetic filling member inserted in the depression and limiting with a bottom of the depression an auxiliary air gap.