US 11,719,340 B2
Three-part oil scraper ring
Florian Böhnke, Leverkusen (DE); Richard Mittler, Burscheid (DE); Thomas Bastuck, Düsseldorf (DE); and Dirk Bärenreuter, Odenthal (DE)
Assigned to Federal-Mogul Burscheid GmbH, Burscheid (DE)
Appl. No. 17/268,140
Filed by FEDERAL-MOGUL BURSCHEID GMBH, Burscheid (DE)
PCT Filed May 28, 2019, PCT No. PCT/EP2019/063852
§ 371(c)(1), (2) Date Feb. 12, 2021,
PCT Pub. No. WO2020/035188, PCT Pub. Date Feb. 20, 2020.
Claims priority of application No. 10 2018 119 584.2 (DE), filed on Aug. 13, 2018; and application No. 10 2018 120 962.2 (DE), filed on Aug. 28, 2018.
Prior Publication US 2021/0332885 A1, Oct. 28, 2021
Int. Cl. F16J 9/06 (2006.01)
CPC F16J 9/06 (2013.01) 8 Claims
OG exemplary drawing
 
1. A three-part oil scraper ring assembly, comprising:
an upper scraper ring,
a lower scraper ring, and
an MF expander spring,
wherein the upper scraper ring has an outer running surface with axial profile consisting of upper and lower segments defined by part-circular lines extending from upper and lower flanks of the upper scraper ring and each having a predetermined radius and connected by an intermediate segment defined by a straight line, and
wherein the lower scraper ring has an outer running surface with an axial profile consisting of upper and lower segments defined by two straight lines extending from upper and lower flanks of the lower scraper ring and connected by an intermediate segment defined by a part-circular line.