Disconnectable Drive For A Vacuum Pump

摘要

A vacuum pump drive is disconnectable from a drive shaft upon movement of a piston against a return spring, under the action of oil pressure. The piston comprises a speed synchronising clutch engageable with the input shaft to rotate the piston at the speed of the input shaft, and teeth to directly dog the piston and input shaft together. The arrangement provides a failsafe drive coupling capable of high torque transmission in direct dog drive.