Spiral bevel gear and gear device

Details Spiral bevel gear and gear device Spiral bevel gear and gear device

2009-03-24

2011-11-01

Krause, Justin (Department: 3656)

Machine element or mechanism

Gearing

Teeth

C074S423000

Reexamination Certificate

active

08047092

ABSTRACT:
In a spiral bevel gear, a contact area between tooth flanks that mesh with each other is increased, thereby reducing teeth knocking noise and strengthening tooth sections.A shape of a tooth form on a normal plane T of a tooth section15of a spiral bevel gear becomes gradually larger as the normal plane moves from a small-diameter end section side towards a large-diameter end section side along a tooth trace H, as indicated by (a), (b), and (c). In correspondence, a tooth crest arc section S is provided in a connecting section21between a tooth flank17on a meshing side and a tooth crest16. The tooth crest arc section S is formed such that a curvature radius r gradually increases within a range that does not exceed a radius R of an inscribed circle inscribed within two tooth flanks17and18and the tooth crest16on the normal plane T. The tooth crest arc section S can increase contact area when contact is made with a tooth flank of a partner gear and elastic deformation occurs.

REFERENCES:
patent: 2311006 (1943-02-01), Trbojevich
patent: 2445559 (1948-07-01), Boor
patent: 2971788 (1961-02-01), Wildhaber
patent: 2002-295642 (2002-10-01), None
patent: 2007-162746 (2007-06-01), None

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