| 摘要 |
In the ventilated holes of the brake ventilated rotor are formed seven thick portions each having equal mass and separated at an equal distance in the circumferential direction from a reference line which is an arbitrary diameter, six thick portions each having equal mass and separated at an equal distance in the circumferential direction from the same reference line, five thick portions each having equal mass and separated at an equal distance in the circumferential direction from the same reference line, and four thick portions each having equal mass and separated at an equal distance in the circumferential direction from the same reference line. In other words, in the ventilating holes of the ventilated rotor are formed a plurality of thick portions which can be classified into four groups, each group having equal mass. The thick portions in respective groups are arranged at an equal distance in the circumferential direction.
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