Patent ID: 6116204
Filing Date: 2000-09-12
Classification: F16J

Abstract:
A single-piece oil scraper piston ring for an internal-combustion engine, comprising(a) a ring axis;(b) first, second and third axially mutually spaced runner webs having a respective first, second and third runner faces adapted to slidingly engage an engine cylinder wall during operation; said first and third runner webs flanking said second runner web;(c) a first connecting web coupling said first runner web to said second runner web;(d) a second connecting web coupling said third runner web to said second runner web;(e) first and second throughgoing oil outflow holes provided in said first and second connecting webs, respectively;(f) a first groove having a first side wall forming part of said first runner web and a second side wall opposite said first side wall;(g) a second groove being axially spaced from said first groove and having a first side wall and a second side wall; said second side wall of said second groove forming part of said third runner web and being situated opposite said first side wall of said second groove; and(h) first and second hose springs received in said first and second grooves, respectively; said first hose spring exerting a force to said first side wall of said first groove for urging said first runner face radially outwardly and said second hose spring exerting a force to said second side wall of said second groove for urging said third runner face radially outwardly.