An electro-mechanical clutch apparatus includes a stationary member (22,122) having a center portion extending along an axis A and a stationary coil assembly (34,134) fixed about the center portion. A rotatable member (46,146) extends along the axis A and includes an annular projection (52,152) radially spaced from the coil assembly. A ratchet surface (29,129) presents a plurality of teeth disposed in axially aligned and radially spaced relationship with the annular projection. The rotatable member includes a magnetic pole piece (62,162) disposed in radially spaced and concentrically aligned relationship with said coil assembly. The rotatable member includes a locking member (58,158) pivotably attached to the annular projection and pivotable between an engaged position in engagement with one of the teeth in response to the coil assembly being de-energized and a released position displaced from engagement with the teeth and attracted towards the magnetic pole piece in response to the coil assembly being energized.

A clutch system includes a rotary input member, a wrap spring clutch and a rotary output member. The wrap spring clutch has a first end, a second end, and a plurality of coils. The stiffness of the wrap spring clutch is selected such that, when transmitting less than a selected coil engagement torque, the clutch system transmits torque helically from the rotary input member, to the second end, helically through the wrap spring clutch to the first end, and into the rotary output member. When transmitting more than the selected coil engagement torque, the clutch system transmits torque in parallel from the rotary input member, to the second end, helically through the wrap spring clutch to the first end, and into the rotary output member, and from the rotary input member through the coil engagement surface, to the first end, and into the rotary output member.

A clutch includes a first race, a second race, a pawl, a post, and a shoe. The second race defines a cam surface. The pawl is supported in the first race to pivot between an engaged position and a disengaged position such that contact between the cam surface and the pawl in the engaged position prevents relative rotation between the first and second races in at least one direction. The post is supported in the first race to slide between a first and a second position such that in the first position the post forces the pawl into the disengaged position. The shoe is configured to pivot with respect to the first race in response to a magnetic field to slide the post into the second position.

A clutch includes a first race, a second race, a pawl, a post, and a shoe. The second race defines a cam surface. The pawl is supported in the first race to pivot between an engaged position and a disengaged position such that contact between the cam surface and the pawl in the engaged position prevents relative rotation between the first and second races in at least one direction. The post is supported in the first race to slide between a first and a second position such that in the first position the post forces the pawl into the disengaged position. The shoe is configured to pivot with respect to the first race in response to a magnetic field to slide the post into the second position.

A selectable one-way clutch includes: a shaft; an actuator configured to cause the shaft to perform a rectilinear motion in a shaft direction; and an arm including an operation portion configured to receive force in the shaft direction from the shaft. The shaft includes a first flange and a second flange. An engaged state and a released state the selectable one-way clutch are switched by an operation of the arm by the rectilinear motion of the shaft, in an assembled state of the shaft and the arm in which the operation portion is arranged between the first flange and the second flange. The first flange is provided with a cut portion in an outer peripheral edge of the first shaft. The shaft has a structure in which the first flange does not face the operation portion in the shaft direction by the cut portion of the first flange.

A selectable one-way clutch is provided. The selectable one-way clutch is shifted between overrunning mode and engagement mode by rotating a selector plate interposed between a notch plate and a pocket plate. The selectable one-way clutch comprises: a plunger that is connected to the selector plate and that is reciprocated by the actuator; a thermally shrinkable stopper member that is fitted onto the plunger; and a stationary member to which the stopper member is brought into abutment by a reciprocating motion of the plunger.

A clutch assembly for a motor vehicle drivetrain for coupling coupling elements for conjoint rotation includes a clutch unit, a brake unit and at least one permanent magnet between the clutch unit and the brake unit. The clutch unit is shiftable into a coupling state in which the coupling elements are coupled to one another by shifting the clutch unit from a first position in which the coupling elements are decoupled into a second position in which the coupling elements are coupled. First and second electrically energizable coils are electrically energizable to move the permanent magnet from the first position into the second position or vice versa. A holding plate is located adjacent to the at least one permanent magnet to suppress magnetic flux from the at least one permanent magnet to the brake unit. A motor vehicle drivetrain containing at least one clutch assembly is also provided.

A clutch assembly for a motor vehicle drivetrain for coupling coupling elements for conjoint rotation includes a clutch unit, a brake unit and at least one permanent magnet between the clutch unit and the brake unit. The clutch unit is shiftable into a coupling state in which the coupling elements are coupled to one another by shifting the clutch unit from a first position in which the coupling elements are decoupled into a second position in which the coupling elements are coupled. First and second electrically energizable coils are electrically energizable to move the permanent magnet from the first position into the second position or vice versa. A holding plate is located adjacent to the at least one permanent magnet to suppress magnetic flux from the at least one permanent magnet to the brake unit. A motor vehicle drivetrain containing at least one clutch assembly is also provided.

A clutch (10) for selectively preventing rotatory movement of a cogged gear (12) about an axis may include an actuator (20) and a pivotally moveable pawl (40) that is interactive with the cogged gear (12). A plunger (24) may be radially movable within and by the actuator (20). A pair of axially spaced sidewalls (16, 18) may include an opposed radially extending slot (52). A pawl pusher (50) may be radially movable between the plunger (24) and the pawl (40). The pawl pusher (50) may include a pair of axially extending wing portions (54, 56) that may be slidably supported in one of the opposed slots (52) to limit movement of the pawl pusher (50) to radial, only. Axial and/or circumferential force loads transmitted to the pawl pusher (50) by the pawl (40) may not be transferred to the radially movable plunger (24).

A clutch assembly that includes an actuator, an apply spring, a pocket plate, which has a pocket, and a strut (e.g., a teeter-totter strut) retained in the pocket, is provided. The apply spring continually acts on the strut for the strut to be in an engaged position. The strut, in response to the actuator additionally acting on the strut, pivots from the engaged position to a disengaged position. The clutch assembly is configured to prevent unintended deployment of the strut due to shock load so that, when the strut is in the disengaged position due to the actuator additionally acting on the strut, the clutch assembly prevents the shock load from causing the strut to pivot from the disengaged position to the engaged position.