Toothing system of a gearwheel having involute roller toothing

US7950305B2 · kind B2 · utility

Assignee

• SONA BLW PRAZISIONSSCHMIEDE GMBH · DE

Inventors

• Peter Gutmann · Ludwigshafen am Rhein, DE
• Jin-Hong Li · Lo Wu, CN

Key dates

• Filing date: Jan 20, 2007
• Grant date: May 31, 2011
• Expiry date: Aug 24, 2027

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T74/19972
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

In the toothing system (1) of a gearwheel having a plurality of teeth (2, 3; 19) whose tooth flanks (4, 5, 6; 22) have involute form above a tooth-root region (7, 8, 9; 23) of the tooth flanks (4, 5, 6; 22), the tooth-root region (7, 8, 9; 23) of the tooth flanks (4, 5, 6; 22) that, as viewed in normal section, extends between a root useful point (15, 16, 17; 23) and a root point (F) has elliptical shape, tangentially adjoins the involute region of the tooth flank (4, 5, 6; 22) at the root useful point (15, 16, 17; 24) and tangentially contacts the root circle (FKS) at the root point (F). In its tooth-root region (7, 8, 9; 23), the tooth flank (4, 5, 6; 22), as viewed in normal section, substantially follows a partial section (B) of an ellipse (10, 11, 12; E) whose semiaxes (a, b) have different lengths, one semiaxis (a, b) of the ellipse (10, 11, 12; E) being inclined at an ellipse tilting angle alpha larger than 0° and smaller than 90° relative to a radial (R) through the root point (F). Furthermore, the tooth flanks (4, 5, 6; 22) of the teeth (2, 3; 19) of the toothing are symmetric to one another across a symmetry plane (A) that divides the respective tooth (2, 3; 19) in axial …