TWO-PIECE OIL RING FOR PREVENTING ROTATION AND ROTATION PREVENTIVE STRUCTURE OF TWO-PIECE OIL RING USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a two-piece oil ring for preventing rotation and a rotation preventive structure of the two-piece oil ring using the same, capable of surely preventing rotation in the circumferential direction of an oil ring in an oil ring groove of a piston, without increasing manufacturing cost even by thinning a width of the oil ring, by sufficiently exhibiting the function of scraping away excessive oil in a cylinder inner wall surface of the oil ring and the function of forming a proper oil film on the cylinder inner wall surface.;SOLUTION: The two-piece oil ring for preventing the rotation is adopted wherein a lower side rail in an oil ring body has a cutout area formed by cutting out the vicinity of an abutment part on the inner peripheral side including the abutment part, a coil expander has a locking part formed by applying bending work to only its one end side, at least a part of the locking part is arranged in the cutout area of the lower side rail, and a tip side of the locking part is inserted and arranged into a drain hole or a slit groove arranged in the piston for locking the oil ring body and the piston.;COPYRIGHT: (C)2012,JPO&INPIT