LUBRICATION OF A PLANETARY GEARSET

摘要

In a planetary gearset and an automatic transmission according to the invention, a pinion shaft (34) on which a pinion gear (PG2) is rotatably supported includes a bearing portion (38) on which a bearing (35) is attached and a polygonal portion (39) having a polygonal outer periphery. An axial oil passage (34a) and radial oil passages (34b) that communicate with the axial oil passage (34a) are formed in the polygonal portion (39), and the inlet of each radial oil passage (37) formed in the pinion gear (PG2) faces the polygonal portion (39).