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Hydraulic Fluid
Sep 20, 2017

Hydraulic fluid

As a fluid coupling operates kinetically, low viscosity fluids are preferred.[7] Generally speaking, multi-grade motor oils or automatic transmission fluids are used. Increasing density of the fluid increases the amount of torque that can be transmitted at a given input speed. However, hydraulic fluids, much like other fluids, are subject to changes in viscosity with temperature change. This leads to a change in transmission performance and so where unwanted performance/efficiency change has to be kept to a minimum, a motor oil or automatic transmission fluid, with a high viscosity index should be used.

Hydrodynamic braking

Fluid couplings can also act as hydrodynamic brakes, dissipating rotational energy as heat through frictional forces (both viscous and fluid/container). When a fluid coupling is used for braking it is also known as a retarder.