US 12,305,763 B2
Piston ring with variable pressure relief
Döndü Karabel, Burscheid (DE); and Jörn Pröpper, Leverkusen (DE)
Assigned to Federal-Mogul Burscheid GmbH, Burscheid (DE)
Appl. No. 18/558,597
Filed by Federal-Mogul Burscheid GmbH, Burscheid (DE)
PCT Filed Mar. 14, 2022, PCT No. PCT/EP2022/056502
§ 371(c)(1), (2) Date Nov. 2, 2023,
PCT Pub. No. WO2022/233481, PCT Pub. Date Nov. 10, 2022.
Claims priority of application No. 10 2021 111 437.3 (DE), filed on May 4, 2021.
Prior Publication US 2024/0229933 A1, Jul. 11, 2024
Int. Cl. F16J 9/20 (2006.01)
CPC F16J 9/20 (2013.01) 17 Claims
OG exemplary drawing
 
1. A piston ring, comprising:
a ring outer side, an upper ring flank and a lower ring flank,
wherein the ring outer side has a pressure relief chamfer at an upper edge, so that only a lower part of the ring outer side has a contact surface, which forms a running surface,
wherein an axial dimension of the contact surface varies in a circumferential direction, and the axial dimension of the contact surface has a minimum axial dimension at a ring end gap, and
wherein an axial distance between the upper edge and the contact surface is at a maximum value in a region of the ring end gap and tapers at an even progression over a circumference to a minimum value, wherein the minimum value lies in the range from 2.5% to 40% of a piston ring height, and wherein the axial dimension of the contact surface in subregions of the circumference is more than 60% and less than 100% of the piston ring height.