A bistable electromagnetic clutch is provided that includes a first part, a second part and an spring part. The first part includes a yoke with a plurality of iron cores, and an electromagnetic coil on each of the iron cores. The second part includes a moving carrier disc and a magnetic conductive disc that is fixed on a side of the moving carrier disc that is away from the yoke. Several magnets are fixed on the moving carrier disc, and the iron cores and the magnets are provided in a correspondence relation. The spring part is configured to keep the moving carrier disc and the yoke in normally separated positions. Two adjacent electromagnetic coils form a group, two electromagnetic coils in a same group are wound to form a group of windings with identical magnetic polarities, and corresponding two magnets form a group of magnetomotive forces with identical magnetic polarities.

A position detection device configured for use with a locking differential is configured to determine a position of an armature in relation to a stator. The stator has a primary coil. The armature moves relative to the stator between engaged and disengaged positions corresponding to the locking differential being in a locked and unlocked state. The position detection device includes a secondary coil disposed proximate to the primary coil. The secondary coil is configured to determine a change in inductance based on movement of the armature. The change in inductance is indicative of a change in position of the armature relative to the stator.

A field core unit for an electromagnetic clutch can include: a field coil generating a magnetic flux; a magnetic part provided with an annular-shaped insertion groove encompassing lower and side portions of the field coil such that the magnetic flux flows through the magnetic part; and a field core configured such that an upper surface thereof is open and an interior space is formed therein. The magnetic part can be inserted into the field core.

A trunnion clutch system is provided for angularly positioning a payload. The system includes a trunnion and a clutch. The trunnion has an annular trunnion housing, a trunnion shaft that engages the payload, and an electromagnetic motor that turns the trunnion housing. The clutch has an annular clutch housing, a jack shaft, a coil of copper winding rings, a plurality of helical springs, an annular armature, and an annular platform. The clutch housing contains a channel. The jack shaft is disposed in the clutch housing and engages the trunnion. The coil of copper winding rings is disposed within the channel. The helical springs are disposed within an angularly distributed plurality of pockets within the clutch housing. The annular armature is disposed to be separate from the coil by a gap via the springs. The annular platform has an abrasive liner disposed adjacent the armature. Energizing the coil pulls the armature away from the liner, thereby disengaging the trunnion.

An electromagnetic system for controlling the operating mode of a non-friction coupling assembly and a coupling and magnetic control assembly are provided. Magnetic circuit components include a ferromagnetic or magnetic element received within a pocket of a coupling member. The element controls the operating mode of the coupling assembly. A stationary electromagnetic source includes at least one excitation coil which generates a magnetic field between poles of the source when the at least one coil is supplied with current. Ferromagnetic or magnetic first and second inserts are received and retained within first and second spaced passages, respectively, of the coupling member. The electromagnetic source, the element, the inserts and air gaps between the various magnetic circuit components make up a closed loop path containing magnetic flux so that the element moves between first and second positions of the element when the at least one coil is supplied with current.

A position detection device configured for use with a locking differential is configured to determine a position of an armature in relation to a stator. The stator has a primary coil. The armature moves relative to the stator between engaged and disengaged positions corresponding to the locking differential being in a locked and unlocked state. The position detection device includes a secondary coil disposed proximate to the primary coil. The secondary coil is configured to determine a change in inductance based on movement of the armature. The change in inductance is indicative of a change in position of the armature relative to the stator.

A switchable one-way clutch is provided for selectively switching between operating as a one-way clutch and a bi-directional locking clutch. The clutch includes a housing, and an outer race and an inner race, which is fixed rotationally to the housing. The clutch also includes a roller cage assembly having a plurality of rollers contactable with the inner race and the outer race. A roller cage is configured to position and contain the plurality of rollers therein. The clutch also includes an annular drag plate contacting the inner race. The drag plate is rotationally fixed to the roller cage and is moveable in an axial direction relative to the roller cage. An electromagnet assembly is configured to magnetize in response to electric energy. Via selective magnetization to attract the drag plate axially, the clutch can switch between operating modes.

A speed differential device of a double overrunning clutch device includes: a left input unit, an left output ring with cam, a right input unit, a right output ring with a cam; and double overrunning clutch device between the left output ring and the right output ring. The double overrunning clutch device includes a left clutch unit and a right clutch unit; and a synchronous unit is installed between the left clutch unit and the left output ring, and between the right clutch unit and the right output ring. The synchronous unit has a left synchronous ring and a right synchronous ring, but rotate independently; an inner surface of each of the left synchronous ring and the right synchronous ring is formed with teeth or tilt teeth; and an outer annular surface of each of the left synchronous ring and right synchronous ring is formed with teeth or tilt teeth.

A speed differential device of a double overrunning clutch device includes: a left input unit, an left output ring with cam, a right input unit, a right output ring with a cam; and double overrunning clutch device between the left output ring and the right output ring. The double overrunning clutch device includes a left clutch unit and a right clutch unit; and a synchronous unit is installed between the left clutch unit and the left output ring, and between the right clutch unit and the right output ring. The synchronous unit has a left synchronous ring and a right synchronous ring, but rotate independently; an inner surface of each of the left synchronous ring and the right synchronous ring is formed with teeth or tilt teeth; and an outer annular surface of each of the left synchronous ring and right synchronous ring is formed with teeth or tilt teeth.

An electromagnetic system for controlling the operating mode of a non-friction coupling assembly and a coupling and magnetic control assembly are provided. Magnetic circuit components include a ferromagnetic or magnetic element received within a pocket of a coupling member. The element controls the operating mode of the coupling assembly. A stationary electromagnetic source includes at least one excitation coil which generates a magnetic field between poles of the source when the at least one coil is supplied with current. Ferromagnetic or magnetic first and second inserts are received and retained within first and second spaced passages, respectively, of the coupling member. The electromagnetic source, the element, the inserts and air gaps between the various magnetic circuit components make up a closed loop path containing magnetic flux so that the element moves between first and second positions of the element when the at least one coil is supplied with current.