| 摘要 |
The present invention relates to piston assemblies (1000A, 1000B, 2000) which move along with a cylinder liner wall. The piston assemblies comprise: compression ring grooves (101a, 101b) into which a compression ring (110) is inserted; and a ring groove (101c) into which a multi-functional ring (120) is inserted wherein the multi-functional ring disconnects oil from air instead of oiling in lower parts of the compression ring grooves (101a, 101b). A basket unit (121) is formed in a spot facing an inner wall of the cylinder liner wall on a lower surface of the multi-functional ring (120). A multi-functional ring groove is installed in a lower part where the last comp ring groove of the piston ends. |
