FIELD: machine building.
SUBSTANCE: invention relates to helical compression steel spring for piston ring made with wear-resistant coating, that can be used as component of oil wiper ring in the piston of the internal-combustion engine. The wear-resistant coating contains layers of CrN and metal-containing DLC-layers out of a-C:H:Me, where Me is tungsten, chrome, titanium, germanium or silicon, at that number of layers is from 10 to 200, and layers out of CrN and a-C:H:Me have thickness from 30 to 100 nm.
EFFECT: helical compression spring with improved friction properties, wear-resistance and running-in ability of at least one component of oil wiper piston ring out of two parts is ensured.
7 cl, 1 dwg
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