Device to circulate a fluid in a hollow shaft

摘要

A device to circulate lubricating oil by radial penetration of the oil into a revolving hollow shaft to lubricate isolated components. The device has a stator and a rotor within a chamber in the stator. Both the stator and rotor are fixed to the shaft. The rotor has a plurality of radial holes. The hollow shaft also has a radial hole which communicates with the internal bore in the shaft. When the shaft is rotated, centrifugal forces act on the oil in the radial holes so as to drive the oil into the chamber and to draw oil through a port around the shaft in the stator. The centrifugal forces also act on any oil in the radial hole so as to tend to drive the oil into the chamber. However, these centrifugal forces are overcome by the pressure forcing the oil into the chamber. Thus, the oil pressure in the chamber drives the oil into the radial hole into the internal bore of the hollow shaft to lubricate isolated components.