Piston ring

摘要

A piston ring, in particular a compression piston ring, includes a main body, which has a radially outer running surface, a radially inner circumferential surface, an upper and a lower flank surface, and a joint, wherein the running surface is provided with at least one circumferential recess which receives a wear-resistant coating, in particular a PVD coating, and wherein, starting from respective end faces of the joint, as seen in the circumferential direction of the main body, a land shoulder is integrally formed on the main body outside the coating and extends at a predetermined radial height over a predetermined circumferential length on both sides of the joint.

主权项

1. A compression piston ring comprising a main body which includes
a radially outer running surface, a radially inner circumferential surface, an upper flank surface and a lower flank surface and a joint, wherein the running surface is provided with at least on circumferential recess which receives a wear-resistant PVD coating, and wherein, starting from respective end faces of the joint, as seen in circumferential direction along the main body, a land shoulder is integral with the main body and extends radially outward beyond the coating to a predetermined radial height in excess of a radial height of the coating, said land shoulder extending circumferentially from the joint for a predetermined circumferential length tapering to a radial height flush with the coating; and wherein the radial height of the land shoulder at the respective end faces of the joint is from 1 to 10 μm.