Patent Number: 6,167,783

Title: Flexible meshing type gearing having three-dimensional, non-interactive wide-area intermeshing tooth profile

Abstract: The meshing of the rigid internal gear and the cup-shaped flexible external gear of a flexible meshing type gear device is simulated with racks, similarity transformation is effected on the composite curve consisting of the envelope obtained by axially projecting the movement loci of the rack teeth relative to each other from the tooth trace opening portion to the tooth trace inner extremity in sections perpendicular to the axis and the movement locus in the vicinity of the tooth trace inner extremity, and the resulting curve is adopted as the basic addendum profile of the external teeth and the internal teeth. Next, the rack axial direction deviation from the rack-approximated tooth profile at the contact point in sections perpendicular to the axis that arises in actual meshing is resolved into that caused by the inclination angle of the tooth center line of the external tooth of the flexible external gear relative to the tooth space center line of the internal tooth of the rigid internal gear and that caused by shift of the movement locus of the tooth of the flexible external gear from the rack movement locus, and the basic addendum profile of the external gear and the internal gear is corrected so that the algebraic sum of the resolved deviations becomes zero. The dedendum profile of both gears is formed by effecting similar correction. As a result, the two gears effect continuous contact meshing along the tooth trace without occurrence of interference.

Inventors: Ishikawa; Shoichi (Kanagawa-ken, JP)

Assignee: Harmonic Drive Systems, Inc.

International Classification: F16H 55/08 (20060101); F16H 55/02 (20060101); F16H 033/00 (); F16H 035/00 (); F16H 037/00 ()

Expiration Date: 01/02/2018