| 摘要 |
An impeller apparatus for a water pump, which includes a driven side rotation body (21, 46, 48, 51) having a shaft portion (22), and an impeller (25) attached on the shaft portion to integrally rotate with the driven side rotation body, characterized in that the driven side rotation body is arranged coaxially to a drive side rotation body (31) which operates an auxiliary, and a plane portion (24a, 46a, 48a, 51a) formed on the driven side rotation body, which is configured to engage with an intermediate member (41) provided on an internal periphery of the drive side rotation body to project inwardly in a radial direction to integrally rotate the driven side rotation body and the drive side rotation body, is positioned outside of the shaft portion in a radial direction.
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