| 摘要 |
In an assembly method of the rotary shaft in use for a ball-bearing type turbocharger, there includes steps of inserting an inner race of the first ball bearing into a rotary shaft to locate it in proximity of a turbine impeller before disposing the rotary shaft into the center housing; inserting a sleeve into the rotary shaft before mounting the second ball bearing on the rotary shaft; applying a compensation force to the inner race of the first ball bearing by way of the sleeve so as to bring one side of the inner race into a tight engagement with a boss portion of the turbine impeller, a magnitude of the force falling within a range from 20% to 120% of an axial force applied in the direction along the rotary shaft when the compressor impeller is secured to the rotary shaft by tightening the screw nut; releasing the compensation force from the inner race of the first ball bearing, and carrying out imbalance-correction of the turbine impeller prior disposing into the center housing.
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