| 摘要 |
PROBLEM TO BE SOLVED: To reduce the oil consumption in a two-piece oil ring composed of a ring body 1 integrally provided with two side rail parts 4 projecting to the radial outside, and a coil expander 2. SOLUTION: In this oil ring composed of the ring body 13 integrally provided with two side rail parts 4 projecting to the radial outside, and the coil expander 2 positioned inside of the ring body, an engagement part 7 of a conical inner face tapered-off to a combustion chamber side, is formed on an inner periphery of the ring body 1, the coil expander 2 is seated on a crank chamber side-inner wall face 13 of the oil ring groove 10 to elastically press the engagement part 7, the side rail parts 4 are slid and abutted on the cylinder inner wall face 13, and a combustion chamber side-outer face 6 of the oil ring is abutted on a combustion chamber side-axial inner wall face 11 of the oil ring groove 10.
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