公开(公告)号：US20220364643A1

公开(公告)日：2022-11-17

申请号：US17318530

申请日：2021-05-12

申请人： Tenneco Inc.

发明人： Daniel J. Dufek ,  Marc Irrgeher

IPC分类号： F16J9/26 ,  C23C28/00 ,  C23C14/06 ,  C25D3/04

摘要： A coated piston ring for a piston is provided. The piston ring includes a running surface, a flank surface, and a transition surface therebetween. The transition surface curves or extends at an angle between the running surface and the flank surface. A running layer is disposed over the running surface and over at least a portion of the transition surface. A flank layer is disposed over the flank surface and over at least a portion of the transition surface. The running layer is applied by physical vapor deposition, and the running layer is applied by galvanic deposition. The running layer is formed of chromium nitride, and the flank layer is formed of chromium. A portion of the flank layer overlaps and is disposed outward of a portion of the running layer. During operation of the piston, the overlapping portion is spaced from both the piston and the cylinder.