| 摘要 |
A fluid coupling device is disclosed in which flow of fluid from a reservoir chamber (35) into a fluid operating chamber (33) is controlled by a valve member (41), rotatable with a valve shaft (39). Rotation of the valve shaft (39) is normally controlled, in response to variations in ambient air temperature, by means of a bimetal coil (45), In accordance with the invention, a normally fixed outer tab (75) of the bimetal coil is attached to an output plunger (85) of an electromagnetic actuator (83). As a result, the operating condition of the fan drive can be changed between a disengaged condition and an engaged condition, in response to variations in a predetermined condition (73), other than ambient air temperature. For example, the fan drive can be operated in the engaged condition, even at relatively low ambient air temperature, when the vehicle air conditioning system is operating, or the fan drive can be put in a disengaged condition, even at relatively high ambient air temperature, when the vehicle or engine speed is above a predetermined maximum.
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