A magnetic coupling assembly for coupling of a first rotary shaft and a second rotary shaft. The magnetic coupling assembly includes a first and second rotary hub, a sleeve, coaxial with the first rotary hub and arranged to be rotatable with respect to the first rotary hub, a first and second displacement element threadingly connected to the sleeve, and a first and a second rotatable inductor rotor arranged to co-rotate with the rotation of the first rotary hub. The first and second rotatable inductor rotors are connected to the first and second displacement element, respectively, and rotatable central magnet rotor. The sleeve includes threaded outer surfaces of opposite threading engaged by the first and second displacement elements so as to displace the first and second displacement elements in opposite directions.

A magnetic coupling assembly for coupling of a first rotary shaft and a second rotary shaft. The magnetic coupling assembly includes a first and second rotary hub, a sleeve, coaxial with the first rotary hub and arranged to be rotatable with respect to the first rotary hub, a first and second displacement element threadingly connected to the sleeve, and a first and a second rotatable inductor rotor arranged to co-rotate with the rotation of the first rotary hub. The first and second rotatable inductor rotors are connected to the first and second displacement element, respectively, and rotatable central magnet rotor. The sleeve includes threaded outer surfaces of opposite threading engaged by the first and second displacement elements so as to displace the first and second displacement elements in opposite directions.

A power transmission device includes an electromagnet, a rotor, an armature and a hub. The hub couples the armature to a shaft of a drive-subject device. The hub includes: an outer hub that is coupled to the armature; a boss portion that is coupled to the shaft; an inner side plate-shaped portion that extends from the boss portion toward a radially outer side; and an inner plate that is placed between the outer hub and the inner side plate-shaped portion. The inner side plate-shaped portion and the inner plate are formed integrally in one piece. At least one of the inner side plate-shaped portion and the inner plate is formed by a member that is configured to deform or melt with heat generated by friction between the rotor and the armature when the shaft of the drive-subject device is locked at a time of energizing the electromagnet.

A power transmission device includes an electromagnet, a rotor, an armature and a hub. The hub couples the armature to a shaft of a drive-subject device. The hub includes: an outer hub that is coupled to the armature; a boss portion that is coupled to the shaft; an inner side plate-shaped portion that extends from the boss portion toward a radially outer side; and an inner plate that is placed between the outer hub and the inner side plate-shaped portion. The inner side plate-shaped portion and the inner plate are formed integrally in one piece. At least one of the inner side plate-shaped portion and the inner plate is formed by a member that is configured to deform or melt with heat generated by friction between the rotor and the armature when the shaft of the drive-subject device is locked at a time of energizing the electromagnet.

An electromagnetic dog clutch is disclosed to solve the technical problem in conventional electromagnetic dog clutches that the friction is easy to occur between a bearing seat and an end cap of a movable gear sleeve. The electromagnetic dog clutch comprises a movable gear sleeve (5) and a fixed gear sleeve (12) that mesh with each other for transmission. A first end cap (6) is provided on an outer side of the movable gear sleeve (5), a bearing (1) is provided on an outer circumference of the movable gear sleeve (5), the bearing (1) is embedded in a bearing seat (7), a rear end of the bearing seat (7) is provided with a positioning surface, and a front end of the first end cap (6) is a vertical plane that matches the positioning surface of the bearing seat (7). The front end of the first end cap (6) is provided with a positioning pin (15), the rear end of the bearing seat (7) is provided with a positioning hole to cooperate with the positioning pin (15), and the positioning pin (15) is inserted into the positioning hole to limit the bearing seat (7) and the first end cap (6) so that they can move in an axial direction relative to each other but cannot rotate relative to each other, thereby preventing the occurrence of friction between them.

An electromagnetic dog clutch is disclosed to solve the technical problem in conventional electromagnetic dog clutches that the friction is easy to occur between a bearing seat and an end cap of a movable gear sleeve. The electromagnetic dog clutch comprises a movable gear sleeve (5) and a fixed gear sleeve (12) that mesh with each other for transmission. A first end cap (6) is provided on an outer side of the movable gear sleeve (5), a bearing (1) is provided on an outer circumference of the movable gear sleeve (5), the bearing (1) is embedded in a bearing seat (7), a rear end of the bearing seat (7) is provided with a positioning surface, and a front end of the first end cap (6) is a vertical plane that matches the positioning surface of the bearing seat (7). The front end of the first end cap (6) is provided with a positioning pin (15), the rear end of the bearing seat (7) is provided with a positioning hole to cooperate with the positioning pin (15), and the positioning pin (15) is inserted into the positioning hole to limit the bearing seat (7) and the first end cap (6) so that they can move in an axial direction relative to each other but cannot rotate relative to each other, thereby preventing the occurrence of friction between them.

An axle disconnect device including a shift collar slidable in an axial direction of the axle disconnect device, the shift collar switchable between a connect mode and a disconnect mode; a first solenoid including a threaded end; a second solenoid including locker arm; a return spring configured to bias a movement of the shift collar towards the connect mode; a groove on the shift collar configured to receive the locker arm when the shift collar is in the connect mode; and a lead screw on the shift collar configured to mesh with the threaded end to move the shift collar toward the disconnect mode against the bias force of the return spring.

An axle disconnect device including a shift collar slidable in an axial direction of the axle disconnect device, the shift collar switchable between a connect mode and a disconnect mode; a first solenoid including a threaded end; a second solenoid including locker arm; a return spring configured to bias a movement of the shift collar towards the connect mode; a groove on the shift collar configured to receive the locker arm when the shift collar is in the connect mode; and a lead screw on the shift collar configured to mesh with the threaded end to move the shift collar toward the disconnect mode against the bias force of the return spring.

A power take-off includes bell housing disposed about an axis and configured for coupling to a housing of an engine or other driving device at a first axial end and to a housing of a driven device at a second axial end. The bell housing defines an air inlet port and an air outlet port between the first and second axial ends. A clutch is disposed within the bell housing and configured to transfer torque from an input member coupled to the engine to an output member coupled to the driven device. A fan is configured for rotation with the input member to draw air into the bell housing through the air inlet port, move air through the bell housing from the air inlet port to the air outlet port in a substantially radial direction across the clutch and exhaust air from the bell housing through the air outlet port.

A power take-off includes bell housing disposed about an axis and configured for coupling to a housing of an engine or other driving device at a first axial end and to a housing of a driven device at a second axial end. The bell housing defines an air inlet port and an air outlet port between the first and second axial ends. A clutch is disposed within the bell housing and configured to transfer torque from an input member coupled to the engine to an output member coupled to the driven device. A fan is configured for rotation with the input member to draw air into the bell housing through the air inlet port, move air through the bell housing from the air inlet port to the air outlet port in a substantially radial direction across the clutch and exhaust air from the bell housing through the air outlet port.