| 摘要 |
In an electromagnetic retarder armature rotor, comprising a disk (1) connected to a securing collar (2) by means of a ring of rams (4, 41) forming ventilation fins, the largest diameter portions of these arms projecting axially from the disk and their tops being connected together by an annular flange (5) parallel to the disk, the assembly of the disk, the collar, the arms and the flange forming a single molded block, if we call D the outer diameter of the disk (1), a the axial distance between this disk (1) and the flange (5), b the radial width of this flange (5) and r the inner radius of said flange (5), the ratio Db/ar is between 10 and 30.
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