Patent ID: 9624941
Date: 2017-04-18
CPC Classifications: F04D,F05D,F16D,Y10T

Claim:
1. A rotor comprising an impeller secured to a shaft, wherein the impeller comprises a bore, a counterbore, a hub, a plurality of blades provided on the hub, and a boss that is cylindrical in shape and extends axially below from the hub, the bore is formed in the hub, the counterbore is formed in the boss, the bore extends axially through the hub and a part of the boss, and that the counterbore extends through another part of the boss, the shaft forms an interference fit with the bore, and the shaft is adhered to the counterbore, wherein when the rotor rotates, a radial stress at the bore in the hub is greater than a radial stress at the counterbore in the boss.