| 摘要 |
<p>In cup-shaped flexing contact gears (1), both a rigid internal gear (2) and a flexible external gear (3) are made to be non-profile-shifted spur gears, an opening (3a) of the flexible external gear (3) is set in a state of negative deflection lower in value than a normal deflection, a moving locus is obtained through rack approximation of teeth of the external gear of the internal gear at respective sections of rotating of tooth trace of the flexible external gear (3), another moving locus in a section of rotation at an end portion of tooth trace on the side of a diaphragm or in the vicinity of the outside of the end portion is smoothly connected to an envelope e^- of the first moving locus, which is obtained by overlapping this moving locus on one of the sections of rotation, so that a composite curve L is obtained. A curve FE is obtained by subjecting to the conversion of similitude of 1/2 in the reduction ratio a portion from a starting point A of the envelope e^- to a terminating point E corresponding to two times the working depth in the direction of the depth from an apex of the moving locus lo when the deflection is 0, using the terminating point as an original point, this curve FE is made to be each of main portions of convex tooth profiles at the tooth faces of the both gears 2 and 3, and, a composite curve MFE includes a straight line MF having a limited pressure angle alpha M associated with a deflection value of an opening inserted in the vicinity of a datum point M of tooth profile and a transient curve smoothly connecting the above-mentioned straight line to the main portion of the convex tooth profile, and this composite curve MFE is made to be each of tooth profiles at the tooth faces of the both gears. <IMAGE></p> |
