| 摘要 |
PURPOSE:To prevent each gear from slipping off, by making up an incline that sets the side of an insertion direction toward the tooth of a shaft collar down to a large broad, while forming an inner circumferential groove in the innermost part of internal gears of an inner gear assembly. CONSTITUTION:An inner gear 10b is provided with a chamfer 10c so as to make a tooth part insertable and an inner circumferential groove 10a is formed up in the innermost part of internal gear. No inclination is provided for the gear tooth itself in the inner gear 10b, that is, a parallel tooth form in type. A tooth 21b of the inner gear 10b is made up in form being provided with an incline 21c so as to cause the side of a chamfer 21d to be a large broad while the reverse side to be a small broad, respectively. When both teeth are engaged in mesh, a projecting part of the chamber falls in the inner circumfeential groove 10a and thereby both teeth are engaged with each other at a square part (a) so that they come to be hard to slip off. |
