BALANCING METHOD FOR A TURBOCHARGER

摘要

A method of balancing turbocharger rotating assembly (50) includes installing a shaft-and-turbine wheel sub-assembly (40) into a ball bearing cartridge (20) within a bearing housing (8) of a turbocharger (1), connecting a compressor wheel (5) to the shaft (6), and testing the balance of the turbocharger rotating assembly (50) while the turbocharger rotating assembly (50) is installed within the bearing housing (8) of the turbocharger (1). Based on the results of the balance testing, material is removed from the turbine wheel (4) while the shaft-and-turbine wheel sub-assembly (40) is installed within the bearing housing (8) of the turbocharger (1). The step of removing the material from the turbine wheel (4) comprises removing material from a peripheral edge (35) of a backwall (34) of the turbine wheel (4).

主权项

1. A method of balancing a rotating assembly (50) of a turbocharger (1), comprising the steps of:
performing initial balancing of a shaft-and-turbine wheel subassembly (40) to provide an initially-balanced shaft-and-turbine wheel subassembly (40); inserting the initially-balanced shaft-and-turbine wheel subassembly (40) into a bearing (20), where the bearing (20) is in a bore (7) of a bearing housing (8) of the turbocharger (1); securing a compressor wheel (5) to the balanced shaft-and-turbine wheel subassembly (40) to form the turbocharger rotating assembly (50); performing low speed balance testing of the turbocharger rotating assembly (50) including measurement of low speed vibrations, while the turbocharger rotating assembly (50) is positioned within the bore (7); comparing the measured low speed vibrations to a first predetermined level of acceptable vibration; based on the results of comparing the measured low speed vibrations to a first predetermined level of acceptable vibration, determining whether balance correction of the turbocharger rotating assembly (50) is necessary; if the measured low speed vibrations exceed the predetermined level, performing balance correction of the turbocharger rotating assembly (50) by removing material from a turbine wheel (4) of the shaft-and-turbine wheel subassembly (40) while the shaft-and-turbine wheel subassembly (40) is installed in the bearing (20), and the bearing (20) is installed within the bore (7); performing high speed balance testing of the turbocharger rotating assembly (50) including measurement of high speed vibrations, while the turbocharger rotating assembly (50) is positioned within the bore (7); comparing the measured high speed vibrations to a second predetermined level of acceptable vibration; based on the results of comparing the measured high speed vibrations to a second predetermined level of acceptable vibration, determining whether balance correction of the turbocharger rotating assembly (50) is necessary; and if the measured high speed vibrations exceed the second predetermined level, performing balance correction of the turbocharger rotating assembly (50) by removing material from one of the compressor wheel (5) and the compressor wheel nut (21) while the turbocharger rotating assembly (50) is installed within the bearing housing (8).