| 摘要 |
PROBLEM TO BE SOLVED: To provide a two-piece oil ring capable of being easily assembled in a piston by allowing a ring body side rail part 4 to be slid and abutted on a cylinder inner wall face 13 by elastically pressing a conical inner face- shaped engagement part 7 of a ring body 1 by a coil expander 2, and abutting a combustion chamber side-outer face 6 of the ring body on a combustion chamber side-inner wall face 11 of an oil ring groove 10. SOLUTION: A stopper part 8 having a minimum inner diameter smaller than a maximum inner diameter of the engagement part 7 is formed on a crank chamber side-inner peripheral edge part 5 of the ring body 1, and the stopper 8 is abutted on the coil expander 2 being getting out from the ring body 1 to the crank chamber side, to prevent the coil expander 2 from dropping out in being assembled to the piston, whereby the coil expander 2 is allowed to be entered into an oil ring groove 10 with the ring body 1.
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