Abstract
The paper deals with some of the problems that arise in the transmission of power by fluid couplings working on the Föttinger principle in connexion with internal combustion engines and electric motors driving a variety of loads. The influence of the core guide ring on the torque and speed characteristics in fluid couplings of the variable-filling type is considered, and an indication is given of the changes in thrust as the filling of the working circuit is varied. Considerable progress has been made towards the simplification of auxiliary means for controlling the quantity in the working circuit. Particulars are given of several methods of dealing with the residual or drag torque in fluid couplings of the constantly filled type, for use with change gear drives. Slip curves relating to backward curved impeller vanes illustrate the variations between theory and practice in this case. Methods of mounting couplings on engine crankshafts and arranging outboard or driven shaft bearings are illustrated, and a variety of applications of fluid couplings are considered from the aspects of heat generation and dissipation.
The internal forces in the ring valve type of fluid coupling may be utilized to close the valve automatically in order to disconnect the drive in case of overload.
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