| 摘要 |
PROBLEM TO BE SOLVED: To provide a gear of a motor-driven power steering device capable of further reducing the quantity of abrasion from a view-point different from a traditional one. SOLUTION: Since the pressure angleαn of a worm wheel 107 on the addendum side is larger than that on the dedendum side, the local abutting of the gear can be controlled and the abrasion of the worm wheel 107 on the dedendum side can be reduced, and therefore, such problems as the increase of the initial backlash can be avoided. |
