The utility model discloses a gear assembly relates to transmission part field, include: the pivot, install in change epaxial gear and locate the pivot with gear bush between the gear, be equipped with the oil storage recess on the first end terminal surface of pivot, the inside of pivot be equipped with with the inlet port of oil storage recess intercommunication and with inlet port intercommunication be used for to the oil outlet of gear bush fuel feeding, the inlet port is kept away from the one end of oil storage recess is sealed. Lubricating oil can effectively get into the clearance between gear bush and the gear shaft through above -mentioned passageway, and lubricated effect is good.