Hydraulic Coupling

Definition - What does Hydraulic Coupling mean?

Hydraulic coupling, also known as fluid coupling is a mechanism which helps in transferring the rotational force from one axis to another axis. The axis can be termed as transmitted and receiving axis in the coupling. The transfer is done with the help of an accelerated or decelerated fluid (oil). The acceleration of load to the maximum and the starting of the motor nearly free of load are done by the hydraulic coupling.

Petropedia explains Hydraulic Coupling

Machines that use fluid or hydraulic couplings consist of two rotating surfaces known as impeller and runner. The fluid is used to control the speed. Both the impeller and runner contain the fluid which flows at high velocity impinging the runner blades which in turn power up the impeller and runner bladed rotors. This transfers the energy from the high-velocity fluid to the runner and the fluid leaves at low velocity.

Hydraulic coupling is mostly applied in:

  • Industrial or Marine machine drives
  • Variable speed operation in the power transmission systems
  • Conveying systems
  • Processing drives
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