High speed bearing for machine tool has radial supply bore holes, which are formed as stepped bore holes in outer bearing ring whereby pressure restrictor discharges into spray hopper

摘要

The bearing has radial supply bore holes (9), which are formed in outer bearing ring (3) as stepped bore holes that exhibit pressure stasis area (11) with enlarged diameter outside the bearing ring. The stepped bore holes start from the bore inlet (10) outside bearing ring with enlarged diameter. The pressure stasis area extends across the largest part of the entire drill depth and is formed with a passage (12) to a pressure restrictor (13) with decreasing diameter. Pressure restrictor discharges, from bearing ring inner side boring outlet (14) of supply drill holes, into a spray hopper (15) in the intermediate area between the bearing rings.