Compressor wheel assembly

摘要

A compressor wheel (7) is assembled to one end of a shaft (8). A nut (17) is threaded onto one end of shaft to clamp the wheel on shaft to prevent axial movement of wheel along shaft and rotational slippage. The end of wheel where nut is threaded has a radial surface contacting radial surface of nut, wherein one radial surface is treated to increase its coefficient of friction with respect to other surface. A turbine wheel (5) is mounted to other end of the shaft for rotation within a turbine housing (4). The compressor wheel has an axial through bore extending between two ends of the wheel. The other end of shaft extends through the bore and a short distance beyond one end of the wheel. An independent claim is also included for a method of treating one radial surface of compressor wheel in turbocharger.