Patent ID: 8047092
Filing Date: 2011-11-01
Classification: F16H,Y10T

Abstract:
1. A spiral bevel gear having a plurality of tooth sections on an outer peripheral surface of a root cone along a circumferential direction, a tooth section having a curved tooth trace and in which a shape of a tooth form on a normal plane perpendicular to the tooth trace of the tooth section becomes gradually larger as the normal plane moves from a small-diameter end section side towards a large-diameter end section side along the tooth trace, the spiral bevel gear, wherein: the tooth section has a tooth crest arc section formed into an arc shape in a connecting section between a tooth flank on a meshing side and a tooth crest on the normal plane; and the tooth crest arc section is formed such that a curvature radius gradually increases as the normal plane moves from the small-diameter end section side towards the large-diameter end section side within a meshing region along the tooth trace, the curvature radius gradually increasing within a range that does not exceed a radius of an inscribed circle inscribed within two tooth flanks and the tooth crest on the normal plane.