A flexing contact type gear drive according to claim 1, wherein a ratio of a whole axial length of the cup-shaped flexible external gear to a diameter thereof is set in the range of about 0.2 to 0.7.
A flexing contact type gear drive according to claim 1, wherein a ratio of a whole axial length of the cup-shaped flexible external gear to a diameter thereof is set in the range of about 0.2 to 0.7.