| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an electric power steering device capable of suppressing occurrence of rattling noise at any of a joint and a worm speed reduction mechanism. <P>SOLUTION: A first end part 22 and a second end part 23 of a worm shaft 20 are rotatably supported by first and second bearings 31 and 32 respectively. An elastic member 45 elastically energizes the second end part 23 by way of the second bearing 32. The first end part 22 includes a first tubular part 34 in which a diameter expansion tolerable part 40 is formed. A male tooth part 41 is formed on the outer circumference of the first tubular part 34. The male tooth part 41 engages with a female tooth part 49 formed at a second tubular part 46 of a joint 30. A ball 42 in the first tubular part 34 pressurizes a part of the male tooth part 41 against the female tooth part 49 by enlarging a part of the diameter expansion tolerable part 40 in axial direction S1. <P>COPYRIGHT: (C)2012,JPO&INPIT |
