Abstract: An electromagnetic clutch is provide that includes a fixed component, a driven component and an elastic component. The fixed component includes a magnetic yoke provided thereon with multiple iron cores, and each iron core is provided thereon with a coil. The driven component includes an armature disc provided thereon with multiple magnets. The armature disc and the magnetic yoke are disposed correspondingly, and the iron cores and the magnets are disposed correspondingly. The elastic component is used to keep the armature disc at a disengaged position from magnetic yoke. When the coil is energized in a forward direction, the iron core attracts the magnet and when the coil is energized in a reverse direction, the iron core generates an electromagnetic force to reduce an attractive force of the magnet.

Abstract: The electromagnetic frictional engagement apparatus includes a housing member in which a housing space is formed, a clutch portion that couples the housing member in a disengageable manner to a shaft disposed so as to be rotatable relative to the housing member, and an electromagnetic coil that generates a magnetic force that actuates the clutch portion. The clutch portion has an outer clutch plate and an inner clutch plate that forms a magnetic path for a magnetic flux generated by the electromagnetic coil. Lubrication grooves through which a lubricant flows are formed in the inner clutch plate. Among the lubrication grooves, the total of groove areas of a portion of the lubrication grooves that is included in the magnetic path is 90 to 110% of a maximum lubrication groove area, so that magnetic flux density resulting from saturation of the magnetic path with magnetic fluxes is not reduced.

Abstract: An overrunning coupling or clutch and control assembly including first and second coupling members and an electromechanical actuator subassembly having an electromagnetically inductive coil which creates a magnetic flux when the coil is energized is provided. A control force caused by the magnetic flux is applied to an armature member of the subassembly to move the armature member and cause the coupling members to be either coupled to or uncoupled from each other by means of struts.

Abstract: An electromagnetic clutch includes a rotating member; an electromagnetic coil that is arranged on a rotational axis of the rotating member and generates electro-magnetic force; an output mechanism that has an armature to which return force in a direction away from the electromagnetic coil is applied by a return spring; a cam mechanism that is juxtaposed along the rotational axis to the output mechanism, and has a control cam that is unable to rotate relative to the rotating member, and a cam follower that is able to roll between the control cam and the armature; and a relative rotation restricting device that is arranged on an axis of the cam mechanism, and that is configured to restrict relative rotation between the armature and the control cam when the electromagnetic coil is in a de-energized state.

Abstract: An electromagnetic clutch that can be easily miniaturized in a direction of a rotational axis of the clutch comprises a driven gear adapted to be rotatably driven by a motor; a rotor rotatable with the rotational axis that is shared with the driven gear and having an electromagnetic coil provided at one end thereof along the rotational axis; an armature mounted between the driven gear and the rotor to be rotatable in unison with the driven gear, and attracted by the rotor when current is applied to the electromagnetic coil; a clutch case accommodating the driven gear, the rotor and the armature therein; a pair of slip rings mounted on one of the rotor at a region adjacent the clutch case that faces away from the armature, and the clutch case at a region adjacent the rotor; the pair of slip rings being coaxial with the rotational axis and having different radii; and a pair of brush elements mounted on the other of the rotor and the clutch case to come into contact with the pair of slip rings from a radial dire

Abstract: A multi-position clutch allows selectively coupling at least two of at least three rotatable shafts is described herein. The clutch comprises at least three cooperation elements respectively associated to one of the at least three rotatable shafts for selective engagement therebetween; the at least three cooperation elements are mounted to the at least three rotatable shafts so as to be sequentially positioned for selective coupling of at least two adjacent cooperation elements. An actuating mechanism is provided for selectively coupling at least two adjacent cooperation elements from the at least three cooperation elements.

Abstract: A differential assembly includes a case, a pair of pinion gears, a pair of side gears and an electrically operable coupling including an electromagnet. The coupling selectively drivingly interconnects one of the side gears and the case. The electromagnet of the coupling is axially moveable within the case to selectively place the differential assembly in an open or a locked condition.

Abstract: A method of transitioning between modes of differentiation in a differential includes measuring a vehicle parameter, determining a mode of differentiation, selectively providing an electrical signal to an electromagnet based on the determination, generating a magnetic field, moving the electromagnet and selectively operating the differential in one of an open mode of differentiation and a locked mode of differentiation in response to movement of the electromagnet.

Abstract: A differential assembly includes a case, a pair of pinion gears, a pair of side gears and an electrically operable coupling including an electromagnet. The coupling selectively drivingly interconnects one of the side gears and the case. The electromagnet of the coupling is axially moveable within the case to selectively place the differential assembly in an open or a locked condition.

Abstract: A differential assembly includes a case, a pair of pinion gears, a pair of side gears and an electrically operable coupling including an electromagnet. The coupling selectively drivingly interconnects one of the side gears and the case. The electromagnet of the coupling is axially moveable within the case to selectively place the differential assembly in an open or a locked condition.

Abstract: A clutch for connecting a flywheel (1) on a drive shaft (2) of an engine with a driven shaft (15) of a gearbox. The flywheel (1) is connected to a clutch cover (7) and between them there is disposed an axially movable pressure plate (8). A clutch disc (9), which is non-rotationally connected to the driven shaft (15), can be clamped between the pressure plate (8) and the flywheel (2) by means of a spring (21) which forces the pressure plate (8) against the flywheel (2). By operating an actuator device (44), the spring's (21) connection with the pressure plate (8) can be broken. According to the invention the clutch comprises a swivel being arranged between the actuator and the driven shaft. The swivel is for transferring a pressure fluid or an electric current to the actuator which may be a hydraulic or an electric actuator.

Abstract: An electromagnetic coil is disposed in a rotor, and electrically insulated from the rotor. A slip-ring is supported by a rotor through a slip-ring supporter, and rotates with the rotor. A brush is supported by a compressor boss portion through a brush supporter, and supplies an electric current to the slip-ring. A diode is disposed in the brush supporter or the slip-ring supporter, and absorbs a surge voltage which is inducted when said electromagnetic coil is disenergized.