High efficiency gear pump

摘要

The high efficiency gear pump includes a pump housing which defines an internal pump chamber. The pump chamber includes opposed first and second elongate gear receiving sections spaced on opposite sides of a central chamber section. The first and second gear receiving sections each have an arcuate peripheral wall which extends between a low pressure inlet port and a high pressure outlet port positioned on opposite sides of the central chamber section between the first and second gear receiving sections. Coaxially mounted on a drive shaft for rotation therewith are first and second pump drive gears having teeth which rotate in minimal spaced relationship with the arcuate peripheral wall of the first gear receiving section. The first and second pump drive gears are mounted for floating axial movement relative to each other and the drive shaft. An idler shaft is mounted in substantially parallel spaced relationship to the drive shaft, and coaxially mounted for rotation on the idler shaft are third and fourth pump idler gears having teeth which mesh with the teeth of the first and second pump drive gears in the central chamber section. The teeth of the third and fourth pump idler gears rotate in minimal spaced relationship with the arcuate peripheral wall of the second gear receiving section. The third and fourth pump idler gears are mounted for floating axial movement relative to each other and the idler shaft.