Fluid clutch

A fluid clutch including a driving part, a rotary shaft rotated by said driving part, a driving disc rotatably driven by said rotary shaft, a sealed case accommodating said driving disc and disposed rotatably on said rotary shaft, and a torque transmitting chamber for incorporating said driving disc therein and an oil reserving chamber for reserving oil which are formed in said sealed case thus constituting a mechanism where oil is supplied to the inside of said torque transmitting chamber from said oil reserving chamber so as to transmit a driving torque of said driving disc to said sealed case, a discharge passage which sends oil supplied to said torque transmitting chamber through a dam mechanism formed in an inner peripheral surface of said sealed case to said oil reserving chamber from said torque transmitting chamber, a partition plate which is provided with a flow-out adjusting hole for oil which makes said oil reserving chamber and said torque transmitting chamber communicate with each other, and a valve member disposed in the inside of said oil reserving chamber, wherein said flow-out adjusting hole is opened or closed in response to the deformation of said valve member caused by the change of temperature of a temperature sensitive body made of a bimetal which is disposed outside of the oil reserving chamber side of said sealed case,

• the improvement being characterized in that in the inside of said torque transmitting chamber, a movable disc which faces said driving disc disposed in the inside of said torque transmitting chamber with a gap therebetween is resiliently supported in such a manner that said gap can be varied, an electromagnet which is disposed outside of the movable disc side of said sealed case at a position where said electromagnet faces said movable disc and attracts said movable disc is provided, whereby said gap between said driving disc and said movable disc is varied by said electromagnet.