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Fluid coupling and external control therefor
| Details |
Inventors: Muhlbach, Gunther; Wollmann, Heinz;
Assignee: Eaton Corporation (Cleveland, OH)
Primary Examiner: Bonck; Rodney H.
Assistant Examiner:
Attorney, Agent or Firm: Kasper; L. J.
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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DETAILED DESCRIPTION Accordingly, it is an object of the present invention to provide a fluid coupling device of the type which normally operates in either an engaged mode or a disengaged mode, in response to ambient air temperature, wherein it is possible to cause the coupling device to operate in a different mode in response to an external input signal, probably unrelated to the ambient air temperature.
It is a more specific object of the present invention to provide an improved fluid coupling device which accomplishes the above-stated object without the need for additional valving structure to control the operation of the fluid coupling device.
The above and other objects of the invention are accomplished by the provision of an improved fluid coupling device of the type including a first rotatable coupling member defining an axis of rotation, and enclosure means associated with the first coupling member to define a fluid chamber therebetween.
A valve means is associated with the first coupling member and is disposed to separate the fluid chamber into a fluid operating chamber and a fluid reservoir chamber.
A second rotatable coupling member is disposed in the fluid operating chamber and is rotatable relative to the first coupling member.
One of the first coupling member and the enclosure means cooperates with the second coupling member to define a viscous shear space therebetween, the valve means being operable to control the flow of fluid between the reservoir chamber and the operating chamber.
The valve means includes a fluid inlet port and a valve member moveable between an open position permitting fluid flow through the inlet port, and a closed position substantially blocking fluid flow through the inlet port.
A valve shaft is operably associated with the valve member for movement therewith, and a bimetal is operably associated with the enclosure means and in operable engagement with the valve shaft to move the valve member between the open and closed positions in response to variations in ambient air temperature
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