A coil housing has an inner ring, which is shaped into an annular form and is placed on an inner side of an electromagnetic coil in a radial direction of a rotational axis. A thermal fuse is placed on an inner side of a coil inner peripheral end of the electromagnetic coil in the radial direction, so that the thermal fuse can be placed in such a manner that the thermal fuse does not limit a length of the electromagnetic coil in a direction of the rotational axis by using a radial thickness of the inner ring that is indispensable as a part of a structure of a magnetic circuit. Thus, it is possible to sufficiently limit occurrence of limiting of a size of the electromagnetic coil that is caused by the placement of the thermal fuse.

Provided are an opposed iron core transmitting rotation motion, a manufacturing method thereof, and an electromagnetic fan clutch formed by the opposed iron core. The opposed iron core includes iron core grooves (12; 13) axially arranged in a back-to-back manner on an electromagnetic iron core body (11). The manufacturing method of the opposed iron core includes: directly drawing the iron core body (11) to form the iron core grooves arranged in the back-to-back manner, or directly spinning the iron core body (11) to form the iron core grooves arranged in the back-to-back manner. The electromagnetic fan clutch formed by the opposed iron core has a first actuation gap (841) and a second actuation gap (842) respectively on two sides of the electromagnetic iron core body (11) of an opposed iron core apparatus.

An actuator for externally manipulating a clutch within a machine rotatable about an axis is provided with a driving unit including a plurality of magnetic coils arranged around the axis, each of the coils being arranged to generate a magnetic flux in a direction parallel to the axis; an armature disposed coaxially with the axis and opposed axially to the driving unit, the armature being movable axially; and a plunger coupled with the armature to transmit axial motion to the clutch.

A differential system is disclosed. The differential system comprises a differential, a split clutch and a differential lock clutch. The differential comprises an outer shell and an inner shell, the inner shell is provided inside the outer shell, and the outer shell is configured to be transmission connected with an upper stage transmission structure of the differential. The split clutch is sleeved on the outer shell and configured to engage or disengage the outer shell and the inner shell. The differential lock clutch is sleeved on the outer shell and configured to lock or unlock the differential. The differential lock clutch is capable of locking the differential only when the differential is in an engaged state with the upper stage transmission structure. In the present disclosure, the split clutch is used to complete the engagement or disengagement of the outer shell of the differential with the upper stage transmission structure, that is, to realize the split function of the power transmission of the outer shell and the inner shell, and the differential lock clutch is used to complete the locking or unlocking of the differential, so that the power can be reasonably distributed to the wheels, thereby improving the vehicle's ability to escape from trouble. The present disclosure integrates the split clutch and the differential lock clutch on the outer shell of the differential, occupies a small volume, and has advantages such as a compact structure and being convenient to arrange on the vehicle.

The differential system comprises a differential, a split clutch and a differential lock clutch. The differential comprises an outer shell and an inner shell, the inner shell is provided inside the outer shell, and the outer shell is configured to be transmission connected with an upper stage transmission structure of the differential. The split clutch is sleeved on the outer shell and configured to engage or disengage the outer shell and the inner shell. The differential lock clutch is sleeved on the outer shell and configured to lock or unlock the differential. The differential lock clutch is capable of locking the differential only when the differential is in an engaged state with the upper stage transmission structure. In the present disclosure, the split clutch is used to complete the engagement or disengagement of the outer shell of the differential with the upper stage transmission structure.