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The Voith variable speed turbo coupling is a fluid coupling that transmits the energy input by the mass forces of a fluid that is circulated in a closed system between an impeller on the driving (primary) shaft and a runner of similar design on the driven (secondary) shaft.

In contrast to the constant-fill type turbo coupling, the oil filling of the variable-speed turbo coupling can be varied between completely filled and drained while in operation. In this way, infinitely variable speed control of the driven machine is achieved over a large range when the coupling operates against the load characteristics. This control range is dependent upon the load characteristic (torque relative to speed) and the required governing accuracy.

The working oil circulation is maintained by a continuously running pump which delivers oil from the integral sump below the coupling into the working compartment. The working compartment is the chamber between the primary (impeller) and the secondary (runner) wheels which is connected to a rotating scoop chamber consisting of an inner and an outer shell. The amount of oil in the working compartment determines the speed at the output side of the coupling and is dependent upon the radial position of a scoop tube located in the scoop chamber. The flow capacity of the scoop tube far exceeds the pump delivery; thus, with respect to control and governing, reaction times are held to a minimum.

Depending on the application, the operation of the scoop tube can be either manual or automatic with the use of an operating mechanism which can be integrated into the control system. Completely assembled actuator and control equipment are normally included in delivery. The heat generated by the slip losses is dissipated by a heat exchanger, should the cooling capacity of the turbo coupling itself prove insufficient.

To learn more about the many applications that Voith and their fluid couplings can offer, let us know.

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