Patent ID: 6709250
Filing Date: 2004-03-23
Classification: F01C,F04C,Y10T

Abstract:
A gear comprising shorter teeth, transition teeth and at least one longer tooth on its pitch circle, wherein the cross-section of said longer tooth is of a hawk beak shape, the profile of said longer tooth is smoothly connected in series by a convex section, a tip section, a concave section, and a leading section, the two sides of said longer tooth are respectively provided with a transition tooth, and each of the transition teeth neighbors a shorter tooth on the opposite side of said longer tooth, characterized in that said convex section and leading section of said longer tooth are designed with a reasonable contact ratio so that the leading section can enter into engagement in time just before the convex section is out of engagement, or the convex section can enter into engagement in time just before the leading section is out of engagement.