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Cornu's spiral tooth gear meetings

Foreign code F190009881
File No. 1702
Posted date Aug 20, 2019
Country United States of America
Application number 88799306
Gazette No. 20090049942
Gazette No. 8100028
Date of filing Apr 6, 2006
Gazette Date Feb 26, 2009
Gazette Date Jan 24, 2012
International application number JP2006307786
International publication number WO2006109838
Date of international filing Apr 6, 2006
Date of international publication Oct 19, 2006
Priority data
  • P2005-139033 (Apr 8, 2005) JP
Title Cornu's spiral tooth gear meetings
Abstract A Cornu's spiral is applied to a tooth profile of a gear. In accordance with the application of the gear, the Cornu's spiral may be modified two-dimensionally by some constant proportion. Since Cornu's spirals have similarity are similar, when a pressure angle is determined, the tooth profile can be standardized by a module, so that it is highly versatile. By replacing the tip of a tooth and the bottom of a tooth by another curve, such as an arc, the range of application can be increased. Since working is always by flank contact between a protrusion and a recess, contact surface stress is low. In addition, the radius of curvature of a dedendum is large. Therefore, tooth bending stress is low, and fatigue strength is high. Even if the number of teeth is small, an undercut is not produced. Even if there is no backlash, a smooth working is achieved, so that the tooth profile is suitable for devices requiring precise alignment.
  • Inventor, and Inventor/Applicant
  • (In Japanese)Miyaoku; Tsutomu
  • (In Japanese)Kanehiro; Jiro
  • (In Japanese)Sasaki; Hidekazu
IPC(International Patent Classification)
Reference ( R and D project ) Hiroshima Prefectural Technology Research Institute