Gearbox with two gears for a machine tool spindle

摘要

The gear box has a jaw clutching device movable along a main axis (X) between jaw clutching positions in which an output shaft is coupled to central input and output wheels (5, 8), respectively. The device has a clutch sleeve with two sets of jaw clutches (9a, 9b) and a tubular piston (11) axially coupled to the clutch sleeve. The piston is slidably mounted in a fixed cylinder body integrated to an outer case (1). Two annular chambers (17, 18) defined in the case, are isolated from one another and are selectively connected to a pressurized fluid source and a vent hole.