PILOTING OF A BEARING HOUSING-SUPPORTED ADJUSTMENT RING

摘要

A variable turbine geometry turbine turbocharger (1) includes vanes (30) configured to control flow of exhaust gas to a turbine wheel (12), and an adjustment ring (40) connected to each vane (30) that controls the angular orientation of all the vanes (30) in unison. The adjustment ring (40) is supported on the bearing housing (16) and is supported on, and piloted relative to, an axially extending nose portion (17) of the bearing housing (16) by surface features (60) formed along an inner edge (43) of the adjustment ring (40).

主权项

1. A turbocharger (1) comprising
a bearing housing (16) including
a bore (15) that defines a longitudinal axis (R), anda nose portion (17) that protrudes axially from one end of the bearing housing (16) and at least partially surrounds the bore (15); a turbine housing (4) secured to the bearing housing (16) and defining an exhaust gas inlet (6), an exhaust gas outlet (8) and a volute (10) disposed between the exhaust gas inlet (6) and the exhaust gas outlet (8); a turbine wheel (12) disposed in the turbine housing (4) between the volute (10) and the exhaust gas outlet (8);and a variable turbine geometry (VTG) device (29) disposed in the turbine housing (4) between the volute (10) and the turbine wheel (12), the VTG device (29) including
pivotable vanes (30) that control the flow of exhaust gas to the turbine wheel (12), andan adjustment ring (40) that controls the rotational orientation of the vanes (30), the adjustment ring (40) rotatably supported on the nose portion (17).