Piston for internal combustion engine, has piston pin boss whose outer side is provided with several projections for securing retaining ring for piston pin in axial direction

摘要

The piston has a piston pin boss (10) whose outer side is provided with several projections (14) for securing retaining ring for piston pin in axial direction. The projections re provided with are radial confinement portions (16). The piston main portion is made of steel.