PURPOSE: To provide a structure preventing the drift between the centers of an impeller and a shaft and capable of suppressing the shaft vibration small during rotation.
CONSTITUTION: A circular coupling section 14 is provided on the axial contact face between an impeller 1 and a shaft 2, and the circular coupling section 14 is constituted of a circular projection 8 (or a circular groove 9) provided on the impeller 1 side coaxially with the shaft 2 and the circular groove section 9 (or the circular projection 8) provided on the shaft 2 side to be coupled with the circular projection 8 (or the circular groove section 9). The outer periphery of the circular projection 8 (or the inner periphery of the circular groove section 9) of the impeller 1 is positioned in the radial direction by the outer periphery of the circular groove section 9 (or the inner periphery of the circular projection 8) of the shaft 2 during rotation. A gap is provided between a through shaft and the through shaft hole of the impeller 1.
TANOU YOSHIYUKI
HAMAZAKI YASUYUKI
| JPS61138801U | 1986-08-28 |