Patent ID: 9339879
Filing Date: 2016-05-17
CPC Classification: B23F,F16H,Y10T

Claim Text:
1. A machining method for machining teeth of a concave-convex gear in a nutation gear set comprising said concave-convex gear and a mating gear, concave teeth of the concave-convex gear and convex teeth of the mating gear being continuously formed in a circumferential direction, and the concave teeth meshing with the convex teeth of the mating gear to allow torque transmission to or from the mating gear, the method comprising: a trajectory extracting step of extracting a relative movement trajectory of each convex tooth of the mating gear with respect to the concave-convex gear that serves as a machining target at the time when torque is transmitted between the mating gear and the concave-convex gear, the concave-convex gear that serves as a machining target being arranged to undergo nutation with respect to the mating gear; and a machining step of moving at least one of a disc-shaped workpiece and a working tool such that a relative movement trajectory of the working tool with respect to a concave tooth forming face of the disc-shaped workpiece coincides with the relative movement trajectory of each convex tooth of the mating gear with respect to the concave-convex gear, extracted in the trajectory extracting step, such that the concave teeth of the concave-convex gear are machined on the concave tooth forming face of the disc-shaped workpiece, wherein in the trajectory extracting step, a relative movement trajectory of a reference axis of each convex tooth of the mating gear with respect to the concave-convex gear is extracted, and the reference axis is an axis that is parallel to a line of intersection of a tooth thickness central plane and reference conical surface of each convex tooth of the mating gear.