| 摘要 |
In a rectifying device of a vehicle ac generator, a positive-side radiating fin and a negative-side radiating fin are arranged to oppose each other in an axial direction and a terminal board is interposed therebetween. One of the fins, which is directly fixed to a frame, is substantially in an arc shape having a circular arc angle of equal to or more than 180 degrees and separated into two partial radiating fins at a substantially middle part in a circumferential direction. Each of the partial radiating fins has two fixing portions near its radially outer end. Screws are inserted into the fixing portions and tightened to threaded holes provided in the frame to fasten the rectifying device to the frame. Instead of separating the fin into the partial radiating fins, a groove is provided on a surface of the fin.
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