EXTERNAL GEAR ECCENTRIC OSCILLATION GEAR DEVICE ROBOT METHOD FOR OPERATING ECCENTRIC OSCILLATION GEAR DEVICE AND GEAR DEVICE GROUP

摘要

An external gear (30) comprises multiple external gear teeth (39) installed on the basis of a center axis (ca). Multiple insertion holes (33), through which a crank shaft (25) passes, are formed in the virtual circumference (vl) which uses the central axis (ca) as a center. The external gear (30) is formed to be asymmetrical on the basis of the center (cp) of the two insertion holes (33) adjacent to each other along the virtual circumference and an axis (A) passing through the center axis (ca). Therefore, the present invention extends the service life of the external gear.