External gear pump - has main drive gear fixed inside housing and driven gear adjusted by pressure differential piston action

摘要

The external gear pump with a continuously variable delivery flow has two gears which are adjustable relative to each other. The drive gear (3) has a fixed location inside the housing (1) and the driven gear (4) may be adjusted according to the fluid pressure differential to give the required flow characteristic. The gear position is adjusted b a pressure piston attached to the gear journal. ADVANTAGE - Automatic flow control.