Patent ID: 6244839
Filing Date: 2001-06-12
Classification: F04C

Abstract:
In a pressurized fluid system including an internal gear pump for pumping fluids to maintain a desirable pressure in the system, the improvement comprising:an improved internal gear pump including a hollow housing accepting fluids to be pumped and emitting pumped fluids at said desirable pressure;a drive shaft penetrating said housing, said drive shaft rotating a gear of said internal gear pump to pump said fluids, said drive shaft having a longitudinal axis and said gear of said internal gear pump and said drive shaft being selectively axially displaceable along said longitudinal axis to vary the displacement of said pump; and,a pressure compensator integral with said housing and operatively associated with said drive shaft, said compensator adapted to vary the axial position of said gear of said internal gear pump on said longitudinal axis of said drive shaft to automatically maintain said pumped fluids at said desirable pressure.