| 摘要 |
PROBLEM TO BE SOLVED: To provide a helical gear that can be mass-produced without shortening the life of dies, metallic molds or the like and that has a high-precision tooth form in helical teeth, and also to provide an apparatus and a method for manufacturing such helical gear. SOLUTION: The helical gear 1 is composed of a columnar shaft 2, a drawing part 4 having a tapered face 3 inclined in the direction drawing the outer diameter of the shaft 2, a gear part 5 extending in the axial direction of the shaft 2 from the drawing part 4, and helical teeth 6 formed on the gear part 5 in a plurality of lines with the tapered face 3 as the starting point a. The helix angle in the incomplete part 6a of the helical teeth 6 in the section corresponding to the tapered face 3 is set smaller than the helix angle of the tooth form part 6b in the section corresponding to the gear part 5. COPYRIGHT: (C)2004,JPO
|
