Abstract: The invention relates to a belt pulley for the output shaft of a gear being driven by an electric motor, with a support for a drive belt at the outer periphery and a receptacle for an axle in the centre, where the receptacle for the axle involves a first region, the profile of which is in such a way noncircular, that between an axle being insertable therein and the belt pulley no slip is possible, and wherein the receptacle for the axle involves a second region including at least one recess apt to allow an elastic part of the axle to snap in a form-fit way when inserted into the belt pulley through the first region. The invention further relates to a gear, to an electric motor, and to an output shaft.

Abstract: The invention relates to a belt pulley for the output shaft of a gear being driven by an electric motor, with a support for a drive belt at the outer periphery and a receptacle for an axle in the centre, where the receptacle for the axle involves a first region, the profile of which is in such a way noncircular, that between an axle being insertable therein and the belt pulley no slip is possible, and wherein the receptacle for the axle involves a second region including at least one recess apt to allow an elastic part of the axle to snap in a form-fit way when inserted into the belt pulley through the first region. The invention further relates to a gear, to an electric motor, and to an output shaft.

Abstract: The invention relates to a worm wheel that is combined with an output shaft to one piece made of plastic material, to a gear with such worm wheel, and to an electric motor with such gear.

Abstract: An additional housing is flanged onto the motor housing of a small electric motor, in particular a motor for the automation of a door, which motor has a flanged-on gear-unit housing, wherein the additional housing is flanged onto the motor housing in the longitudinal direction of the motor and has at least two through-bores which extend parallel to one another and perpendicularly to the longitudinal direction of the motor, and wherein the ends of the through-bores have flat bearing surfaces which lie perpendicularly to the through-bores.

Abstract: The invention relates to an electric-motor drive with a gear unit, the transmission ratio of which is in the range between 80:1 and 220:1, and to an automatic door operating device, in particular for swinging doors, with such a drive. A particularly quiet and compact drive, which, when used in an automatic door operating device, is suitable both for right-hand-hung and left-hand-hung doors, is characterised in that the gear unit has two stages, the first stage being designed as a worm gear stage and the second stage being designed as a spur gear stage.