External control type fluid coupling

An external control type fluid coupling comprising:

• a drive disk that is fixed to a rotary shaft;
• a housing that is rotatably supported by the rotary shaft and defines an internal space;
• a partition plate that is provided in the housing and partitions the internal space into an operation chamber accommodating the drive disk and a storage chamber storing a fluid;
• a supply hole that is formed in the partition plate and supplies the fluid from the storage chamber to the operation chamber;
• a valve body that is provided in the housing and is made of a magnetic material capable of opening and closing the supply hole;
• and
• an electromagnet that generates an attraction force between the electromagnet and the valve body so that the valve body is displaced to a closed state for closing the supply hole,
• wherein the valve body is rotatably connected to the housing, and
• the center of gravity of the valve body is set such that the valve body is rotated to a side on which the supply hole is opened by a centrifugal force acting with the rotation of the housing.