The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 15, 2014
Filed:
Dec. 18, 2008
Shoichi Ishikawa, Yokohama, JP;
Shoichi Ishikawa, Yokohama, JP;
Harmonic Drive Systems Inc., Shinagawa-Ku, Tokyo, JP;
Abstract
Disclosed is a wave gear device () for setting the flexible state of the principal section () of a flexible external gear in a normal-deflection state (at a deflection coefficient κ=1). The moving locus of a tooth profile in the principal section () is determined by a rack approximation, and a similar curve (BC), which is obtained by similarly transforming a curve (AB) cut from that moving locus, is used to define the fundamental addendum shape of the tooth profile in the principal section. The portion of the tooth profile of the flexible external gear other than the principal section is shifted so that both each negative-deflection side moving locus (M), which is obtained in each plane of rotation to deflect in a negative deflection state (at the deflection coefficient κ<1) closer to the diaphragm side than the principal section and each positive-deflection side moving locus (M), which is obtained in each plane of rotation to deflect in a positive deflection state (at the deflection coefficient κ>1) closer to the front end opening side than the principal section, may become curves (Mand M) to contact at the bottom (a point (P)) of a normal-deflection moving locus (M). The partial meshing engagement can also be held at the section other than the principal section in the tooth trace direction, so that the load torque performance of the wave gear device can be advantageously improved.