Abstract: A friction clutch for transmitting torque from a rotor, which can be driven about an axis S, to an element which is to be driven, including a friction disk clutch having an electromagnet arrangement which has a coil former and magnetically conductive means which comprise a web section lying radially on the outside with respect to the axis S and a web section lying radially on the inside and oriented axially, and permanently magnetic means via which an axially movable friction section of the friction disk clutch can be magnetically connected to the rotor, wherein, in the electrically switched on state of the electromagnetic arrangement, the bearing of the friction section against the rotor can be eliminated by attenuating the magnetic attraction effect of the permanently magnetic means.

Abstract: An electromagnetically actuatable clutch for a water pump in a cooling water circuit of an internal combustion engine, having a drive wheel rotatably mounted relative to the water pump, and an armature disk, which interacts with a coil. The armature disk and a functional component of an eddy current clutch are connected to the drive wheel so that the drive wheel, armature disk and first functional component run synchronously when they rotate. The armature disk can be moved axially with the first functional component by energizing the coil. A second functional component of the eddy current clutch is provided arranged in a fixed fashion on a shaft coupled to the water pump. A friction mechanism is provided between the first and second functional components to provide a frictional locking engagement between the two functional components that is released by energizing the coil.

Abstract: A liquid pump for an internal combustion engine having a housing in which a pump rotational shaft is accommodated, in particular a water pump of a heat exchanger circuit of a vehicle, and an eddy current arrangement is provided at least partially inside the housing of the liquid pump. The invention furthermore relates to a device for heating a liquid.

Abstract: A friction clutch for a driven element is proposed, wherein the driven element can clutch be connected directly to a drive and can be matched to the speed of the drive by means of a friction disk clutch. According to the invention, an eddy-current clutch which can be activated or deactivated is provided by respectively mounting or removing at least one part (1, 12) of the eddy-current clutch by means of a quick-action connection (6, 10). It is also proposed that an eddy-current and/or permanent magnet means (1, 12) is distributed in an azimuthal or circumferential manner.

Abstract: The invention relates to an apparatus having an electromagnet, comprising a coil and magnetic-field guide means, which at least partially surround the coil. According to the invention, the coil is provided with a sprayed or cast casing, wherein the magnetic-field guide means are formed from a material which comprises ferromagnetic metal particles and plastic material. The invention also relates to a clutch having an apparatus such as this, and to a method for production of an electromagnet.

Abstract: The invention proposes a rotor for a two-stage electromagnetically operated friction disk clutch which comprises two electromagnets and armature means which can be brought into contact with the rotor and are composed of a magnetically permeable material. According to the invention, there is no axial web, or at least no substantial axial web, which projects into the electromagnetic region in a manner arranged in the friction clutch on the rotor, between a radially outer edge region and a radially inner center region on the rotor. The invention also proposes an electromagnetically operated friction disk clutch which has a rotor of this type.

Abstract: A friction clutch for a driven element that is connected directly to a drive by means of a first friction-disk clutch and being capable of being matched to the speed of the drive. When the first friction-disk clutch is disengaged, the drive of the driven element is adjusted to a relatively low take-up speed by means of an eddy-current clutch which can be engaged by means of a second friction-disk clutch. The driven element is arranged on a shaft or axle, so that, when the first and second friction clutches are disengaged, the drive of the driven element can be adjusted to a further take-up speed by means of the friction of a roller bearing. The eddy-current clutch includes an eddy-current part and a permanent magnet part which can be moved relative to the eddy-current part.

Abstract: A drive member for a water pump of a cooling water circuit of an internal combustion engine, including a drive wheel, a shaft which is coupled to the water pump, and an electromagnetically actuable frictional shift clutch for the transfer of torque between the drive wheel and the shaft. According to the invention, a transfer of torque to a driven wheel can be shifted by means of the frictional shift clutch.

Abstract: The invention proposes a rotor for a two-stage electromagnetically operated friction disk clutch which comprises two electromagnets and armature means which can be brought into contact with the rotor and are composed of a magnetically permeable material. According to the invention, there is no axial web, or at least no substantial axial web, which projects into the electromagnetic region in a manner arranged in the friction clutch on the rotor, between a radially outer edge region and a radially inner center region on the rotor. The invention also proposes an electromagnetically operated friction disk clutch which has a rotor of this type.

Abstract: An electromagnetically operable friction disk clutch having a electromagnet as well as having a rotor and an armature element to which the electromagnet can apply a magnetic field for interaction of the rotor and armature element, the armature element being arranged on a resting means which moves the armature element along a rotation axis of the rotor by magnetic force through a movement distance to a stop position on the rotor, and returns elastically without any magnetic forces to a position in which the armature element and the rotor can move, with respect to one another, without touching. According to the invention the resetting means comprise not only an elastic component but also a plastic component which at least partially compensates for the increase in the original movement distance resulting from wear by plastic deformation of the resetting means.

Abstract: A friction clutch for a driven element that is connected directly to a drive by means of a first friction-disk clutch and being capable of being matched to the speed of the drive. When the first friction-disk clutch is disengaged, the drive of the driven element is adjusted to a relatively low take-up speed by means of an eddy-current clutch which can be engaged by means of a second friction-disk clutch. The driven element is arranged on a shaft or axle, so that, when the first and second friction clutches are disengaged, the drive of the driven element can be adjusted to a further take-up speed by means of the friction of a roller bearing. The eddy-current clutch includes an eddy-current part and a permanent magnet part which can be moved relative to the eddy-current part.

Abstract: A friction clutch for a driven element is proposed, wherein the driven element can clutch be connected directly to a drive and can be matched to the speed of the drive by means of a friction disk clutch. According to the invention, an eddy-current clutch which can be activated or deactivated is provided by respectively mounting or removing at least one part (1, 12) of the eddy-current clutch by means of a quick-action connection (6, 10). It is also proposed that an eddy-current and/or permanent magnet means (1, 12) is distributed in an azimuthal or circumferential manner.

Abstract: An electromagnetically operable friction disk clutch having a electromagnet as well as having a rotor and an armature element to which the electromagnet can apply a magnetic field for interaction of the rotor and armature element, the armature element being arranged on a resting means which moves the armature element along a rotation axis of the rotor by magnetic force through a movement distance to a stop position on the rotor, and returns elastically without any magnetic forces to a position in which the armature element and the rotor can move, with respect to one another, without touching. According to the invention the resetting means comprise not only an elastic component but also a plastic component which at least partially compensates for the increase in the original movement distance resulting from wear by plastic deformation of the resetting means.