Oil scraper ring, has number of oil passage openings provided between runways and viewed in circumferential direction, where cross-section of openings increases radially from outer peripheral surface to inner peripheral surface

摘要

The ring has two spaced runways (2, 3), and with a spring unit, which is provided in an area of an inner peripheral surface (6). A number of oil passage openings (11) are provided between the runways and viewed in a circumferential direction, where cross-section of the openings increases radially from an outer peripheral surface (4) to the inner peripheral surface. A peripheral groove having the rounded form is inserted between the runways, and another groove is provided in an area of the inner peripheral surface.