HELICAL GEAR PUMPS, COMPRESSORS OR MOTORS

摘要

A helical gear pump, compressor or motor including an inner member with an external helical gear form having n starts, an outer member with a cooperating internal gear form having n + 1 starts. The inner member is provided with a first externally toothed gear and the outer member is provided with a second externally toothed gear. A geared connection between the first and second external gears synchronises the rotation of the inner and outer members so that they can rotate relative to one another independently of any contact between the helical gear forms of the inner and outer members.