Abstract: A cooling fan device for use with an internal combustion engine in which there is provided a viscous fluid coupling operable to control the speed of rotation of a fan for cooling a radiator in response to variation in the temperature of the engine. A partition plate is provided in a fluid-tight chamber so as to divide the chamber into a working chamber and a reservoir chamber. The partition plate has two holes which allow fluid flow from the reservoir chamber to the working chamber. Two valves, one for each hole, are provided which are normally biased to close the holes. One of the valves is attached to a slidable plug which moves in response to temperature change; the other valve is positioned to be engaged by the first valve. Changeover valves control the movement of the plug by allowing suction air pressure or atmospheric air pressure to enter a diaphragm at one end of the plug as the engine temperature varies and thereby open or close the holes.

Abstract: An actuator device used with an engine-idle control system of an automobile provided with an air-conditioner, and is adapted so as to operate an operating rod in association with a throttle valve opening lever of an internal combustion engine.

Abstract: An electromagnetic valve assembly including a housing, a diaphragm member provided in the housing and defining first and second chambers therein, a first heat conducting plate member secured to the diaphragm member, a heat conductive output member secured to the first heat conductive plate member and extending outside of the housing, a heat conductive spring member one end of which is engaged with the heat conductive plate member, the spring member being positioned within the first chamber and normally biasing the diaphragm member in one direction, a solenoid coil positioned in the first chamber energized in repsonse to an electric signal, a contact operatively associated with the solenoid coil movable in response to energization of the solenoid coil, a first and second pressure source, a first valve member controlling fluid communication between the first chamber and the first pressure source in response to movement of the movable contact, a second valve member controlling fluid communication between the fir