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GEAR WITH CORNU'S SPIRAL TOOTH PROFILE meetings

Foreign code F190009883
File No. 1702
Posted date Aug 20, 2019
Country EPO
Application number 06731722
Gazette No. 1873420
Gazette No. 1873420
Date of filing Apr 6, 2006
Gazette Date Jan 2, 2008
Gazette Date Sep 26, 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 GEAR WITH CORNU'S SPIRAL TOOTH PROFILE 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.
  • Applicant
  • MIYAOKU, Tsutomu
  • KANEHIRO, Jiro
  • SASAKI, Hidekazu
  • Inventor
  • MIYAOKU, Tsutomu
  • KANEHIRO, Jiro
  • SASAKI, Hidekazu
IPC(International Patent Classification)
Reference ( R and D project ) Hiroshima Prefectural Technology Research Institute

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