GEAR, REDUCTION GEAR MECHANISM, AND ELECTRIC TYPE POWER STEERING DEVICE

摘要

PROBLEM TO BE SOLVED: To easily obtain a desirable hollow without making any special work after a circular member having teeth on its outer circumference is coupled with a core member. SOLUTION: In an engagement part 14 between the circular member 12 of synthetic resin and the core member 13 engaged on the inner side of the circular member 12, a hollow 4 to restrict volume increase in a radial direction by expansion of the circular member 12 is provided, and the circular member 12 is fused with the core member 13. The desirable hollow 4 is thus easily obtained.