Patent ID: 7401980

Claim:
A thrust bearing for a turbocharger shaft having a collar, the thrust bearing comprising: an essentially disc shaped bearing body ( 10 ) with a central through opening ( 12 ) adapted to receive the shaft, at least one bearing surface ( 14 ) surrounding the through opening ( 12 ) adapted for the collar disposed on the shaft, an oil pocket ( 18 ) formed in the bearing body ( 10 ) extending concentrically with respect to the through opening ( 12 ) over part of the circumference of the bearing body ( 10 ), the oil pocket ( 18 ) being adapted to receive lubricating oil, at least one oil supply channel ( 16 ′) extending from the oil pocket ( 18 ) to the through opening ( 12 ), wherein the at least one oil supply channel is a groove ( 16 ′), and an oil drain groove ( 20 ) encircling the at least one bearing surface ( 14 ) and being concentric to the through opening ( 12 ), wherein an area of cross section of the oil supply channel ( 16 ′) is larger than an area of cross section of the oil drain groove ( 20 ).