Abstract: Arrangement for effective oil supply to a working chamber in a hydrodynamic coupling flushed through with oil, and lubrication of the bearings of the coupling. The working chamber is supplied with oil through a channel in the stationary part of the coupling via a main bearing forming part of the coupling and bearing the turbine in the pump wheel. A second main bearing bearing the pump wheel in the stationary part receives a continuously limited throughflow of lubricating oil via a throttle in communication with the flow of oil to the first main bearing. By means of the invention, a steady flow of oil to the working chamber of the coupling is obtained, and at the same time all the main bearings receive a continuous throughflow of lubricating oil which does not cause any great oil friction losses in the bearings during stationary running.