Annular element for cylinder of internal combustion engine, has annular portion including inner section that is set to deviate from circular shape such that annular portion is fitted into circular groove of cylinder line

摘要

The element has an annular portion (12a) that is provided in an upper center position of a piston (4). A bar portion (10) is provided between a piston head portion (11) and a piston ring (5). An inner section of the annular portion is set to deviate from a circular shape such that the annular portion is fitted into a circular groove of a cylinder liner (2).