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Wave gear device having three-dimensionally contactable shifted tooth profile

Disclosed is a wave gear device (1) for setting the flexible state of the principal section (30) 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 (30) 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 (M3), 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 (M2), 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 (M3a and M2a) to contact at the bottom (a point (P)) of a normal-deflection moving locus (M1). 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.
Owner:HARMONIC DRIVE SYST IND CO LTD
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