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Abstract

A planetary gear drive comprising two adjacent central gears with different numbers of substantially wedge-shaped teeth which form virtual tooth gaps with one another and define a virtual crown curve and a planetary gear having teeth which are pressed into said virtual tooth gaps by a rotating element. With a difference of four in the numbers of teeth of the central gears, the center of curvature of the virtual crown curve and the radii of the root circles are such that in a predetermined engagement region the entry and exit angles and the radial speed of the teeth of the planetary gear remain substantially constant, and the flank angles of the central gears differ by at least about twice the entry angle. With a difference of two in the numbers of teeth of the central gears, the virtual crown curve largely extends out of the teeth after a 90.degree. rotation, and the engagement region lies in the region of the minimum change of the entry and exit angles. Such gear drives have a low construction cost and can achieve transmission ratios as low as 1:6 while transmitting large rotational moments and avoiding rolling movement of the tooth flanks in the engagement region.

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First Claim