| 摘要 |
<p>A ventilated rotor (1) has a first slide board (2), a second slide board (3) which faces the first slide board (2) and N-numbered (N: natural number, not less than 2) ribs (5) provided between the first and second slide boards (2,3). The first and second slide boards (2,3) have a common central axis (X), and the N-numbered ribs (5) include ribs (5a), which are in reference providing positions separated from each other at equal angular intervals in the circumferential direction and are elongated in a radial direction perpendicular to the central axis, and N/n-numbered (n: natural number, not less than 2, N/n: natural number) ribs (5b) which are shifted from the reference providing positions by a prescribed angle in one direction of the circumferential direction and are elongated in the radial direction. In another embodiment , the N-numbered ribs (25) include N/n-numbered ribs (25b) which have portions (25b1-25b3) divided by separation from each other in the radial direction. <IMAGE></p> |
