| 摘要 |
PROBLEM TO BE SOLVED: To reduce the diameter of a sleeve, to reduce size and weight, and to improve power generation efficiency of an alternator. SOLUTION: A female serration 10 formed on an intermediate part inner peripheral surface of the sleeve 1a and a male serration part 11 formed on a tip part outer peripheral surface of a rotary shaft 5 of an alternator are engaged with each other. A bolt 20 is threadedly engaged with a screw hole 17 formed on a tip surface of this rotary shaft 5, and a step part 18 arranged on an inner peripheral surface of the sleeve la is pressed down by a collar part 22 arranged in a head part 21 of this bolt 20. A tip part inner peripheral surface of the rotary shaft 5 can be formed as a cylindrical surface part 19 to solve the subject. |
