Centrifugal compressor, turbocharger including the centrifugal compressor, and method for manufacturing the centrifugal compressor

摘要

A centrifugal compressor in which an axial force applied to a sleeve portion from a shrink-fitted impeller is secured even when the sleeve portion and the clamp surface are separated in the axial direction of the mounting hole, a turbocharger including the centrifugal compressor, and the For the purpose of providing a method for manufacturing a centrifugal compressor, the inner peripheral surface of the mounting hole formed in the hub includes a clamp surface and an enlarged surface, and the outer peripheral surface of the sleeve portion includes a reduced diameter surface. The diameter-expanded surface and the diameter-reduced surface each have an impeller-side contact portion and a sleeve-side contact portion that are in contact with each other. d, the length from the sleeve side abutting portion to the clamp surface in the axial direction of the mounting hole is L, and the hypothetical conical bus line that contacts the reduced diameter surface at the sleeve side abutting portion and the axis of the sleeve Is the sleeve inclination angle θs, the relationship represented by the following formula: θs atan (d / L) is satisfied.