Now, a straight line is drawn passing through the origin of the coordinate axes and the point A. Then, a composite curve MFE is obtained by similarity transforming a composite curve OAE at a reduction ratio of 1/2. The thus obtained composite curve MFE is rounded at the point F so as to smoothly connect the curve and the straight portions thereof, which in turn is made to be convex tooth profiles at the tooth faces of the rigid internal gear 2. Thereafter, a curve MO which is symmetrical to the convex tooth profile with respect to the point M (datum point) is obtained and is made to be convex tooth profiles at the tooth faces of the flexible external gear 3. Accordingly, the tooth profiles of the present invention become linear tooth profiles on and near the datum points through the rack approximation. Then, the pressure angle αM is obtained of the straight line. The value of αM can be obtained by the following equation, using the expressions (1) and (6).
Now, a straight line is drawn passing through the origin of the coordinate axes and the point A. Then, a composite curve MFE is obtained by similarity transforming a composite curve OAE at a reduction ratio of 1/2. The thus obtained composite curve MFE is rounded at the point F so as to smoothly connect the curve and the straight portions thereof, which in turn is made to be convex tooth profiles at the tooth faces of the rigid internal gear 2. Thereafter, a curve MO which is symmetrical to the convex tooth profile with respect to the point M (datum point) is obtained and is made to be convex tooth profiles at the tooth faces of the flexible external gear 3. Accordingly, the tooth profiles of the present invention become linear tooth profiles on and near the datum points through the rack approximation. Then, the pressure angle αM is obtained of the straight line. The value of αM can be obtained by the following equation, using the expressions (1) and (6).
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