EXTERNAL SPUR GEAR, ECCENTRIC OSCILLATION TYPE GEAR DEVICE, ROBOT, USE METHOD OF ECCENTRIC OSCILLATION TYPE GEAR DEVICE, AND GEAR DEVICE GROUP

摘要

PROBLEM TO BE SOLVED: To prolong the service life of an external spur gear.SOLUTION: An outer spur gear 30 has a plurality of external teeth 39 provided with a center axial line ca as a center. A plurality of insertion holes 33 through which a crank shaft 25 passes is formed on a virtual circumference vl with the center axial line ca as a center. The outer spur gear 30 is formed into an asymmetric shape with an axial line A passing through the center axial line ca and a center cp of two insertion holes 33 adjacent along the virtual circumference as a center.SELECTED DRAWING: Figure 2