| 摘要 |
PROBLEM TO BE SOLVED: To prevent a resin gear 20 from being pulled out of an outer cylindrical section 15 by achieving whirl-stop of the resin gear 20 to the peripheral direction of the outer cylindrical section 15 and preventing the resin gear 20 from moving axially to both sides, regarding a gear device applied to a ball screw device or the like. SOLUTION: The resin gear 20 is formed on a cylindrical bracket 10 made of a thin steel by injection molding. The bracket 10 includes an annular section 14 being extended in a diameter direction; and the outer cylindrical section 15 being extended in an axial direction from the outer diameter end of the annular section 14. The cylindrical section 15 is set to be a corrugated sheet section 18, where a tip side as compared with the middle in the axial direction is expanded in the direction of an outer diameter, and a projection 18a and a recess 18b are alternately formed in the circumferential direction. The resin gear 20 is formed on an outer periphery surface 15a in the outer cylindrical section 15 in a form for coming into contact with both the ends in the axial direction of the corrugated sheet section 18. COPYRIGHT: (C)2004,JPO |
