| 摘要 |
A rotor for an eddy current retarder has a plurality of cooling fins provided around an outer surface of a drum. A transverse cross section of each of the cooling fins is rectangular or trapezoidal, and heights h of the cooling fins are equal, and the following expressions (1) to (3) are satisfied. Since this rotor is excellent in cooling ability, this is suitable as a rotor for a retarder of a large vehicle.wherein d is distance between bottoms of the cooling fins, theta is a fin angle in a longitudinal direction of the cooling fin with respect to a rotational direction of the rotor, H=2h2/(t1+t2), t1 is thickness of the bottom of the cooling fin, and t2 is thickness of top of the cooling fin.
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