TWO-PIECE OIL RING FOR ROTATION PREVENTION

摘要

PROBLEM TO BE SOLVED: To provide a rotation-stop structure of a two-piece oil ring, preventing deterioration of an oil scraping function of the oil ring at a cylinder inner wall face, inhibiting increase of a manufacturing cost and excelling in ease of installation work.;SOLUTION: The two-piece oil ring includes an oil ring body, which has an almost H shape in cross section with an upper rail arranged on one end side of a web equipped with oil return holes and a lower rail arranged on the other end side and is equipped with a joint part, and a coil expander arranged on an inner peripheral side of the oil ring body to press and bias the oil ring body to the cylinder inner wall face. A projection shape capable of being inserted and locked in a drain hole equipped in the piston is provided near the joint part of the oil ring body and is connected to one of the rails.;COPYRIGHT: (C)2011,JPO&INPIT