192 clutches and power-stop control – Clutches – Fluent material
Patent
1974-08-05
1976-08-10
Herrmann, Allan D.
192 clutches and power-stop control
Clutches
Fluent material
192 82T, 192113B, F16D 3100
Patent
active
039736571
ABSTRACT:
A variable speed fan for heat exchangers comprising a variable speed torque transmitting coupling interposed between a constant speed drive shaft and a fan for varying the speed of the fan in an air cooled heat exchanger having a constant speed drive for input torque. Torque is applied at a constant speed from the drive shaft of a suitable power source to a pump disposed in a fluid reservoir contained in a housing supported on the drive shaft. The reservoir housing is journalled on the drive shaft and rotatably supports the fan thereon. The pump is rigidly secured to the reservoir housing and as the rotor of the pump is rotated by the drive shaft, fluid is pulled into the pump and discharged therefrom through a suitable variable orifice valve for being recirculated to the fluid reservoir. When the variable valve is fully closed the pump functions as a rigid coupling between the drive shaft and the reservoir housing due to the static pressure built up in the hydraulic fluid, thus transmitting torque from the drive shaft to the housing, which then rotates simultaneously with the drive shaft for rotating the fan at the same speed as the speed of rotation of the drive shaft. The rotating speed of the fan is varied from the full speed of the drive shaft to substantially zero revolutions per minute by varying the opening of the orifice in the variable valve from fully closed to fully open.
REFERENCES:
patent: 1883685 (1932-10-01), Gasterstadt
patent: 1935400 (1933-11-01), Junkers
patent: 2559358 (1951-07-01), Hullhorst et al.
patent: 2633216 (1953-03-01), Zak
patent: 3020992 (1962-02-01), Gunn
patent: 3208570 (1965-09-01), Aschauer
patent: 3458020 (1969-07-01), Lutz
patent: 3809197 (1974-05-01), Clancey
Herrmann Allan D.
The Mott Company
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