ABSTRACT
Fluid retarders may be thought of as fluid couplings with the runner held stationary, which is, therefore, known as the stator. Figures 7(a) and (b) show opposites sides of a retarder that is equipped with a heat exchanger, an oil reservoir, or sump, and a remotely controlled valve that regulates the flow of oil from the sump into the chamber that encloses the impeller, or rotor, and the stator. The entire unit may be mounted in series with the primary shaft, as shown in Figure 7(d), for example, or it may be mounted on secondary shaft that maintains a given speed ratio relative to the primary shaft.
