Piston ring of chrome-base ceramic composite plating layer

Abstract

The invention discloses a piston ring of a chrome-base ceramic composite plating layer, comprising a first gas ring, a second gas ring, an oil ring-closure piece, wherein the first gas ring adopts a trapezoidal half-inlaid oblique barrel surface, namely that the section of the first gas ring is in a trapezoidal shape, and ceramic particles are inlaid on an outer circle-face part; the second gas ring adopts an anti-twist taper-face ring; the oil ring-closure piece is an antidromic chamfer-angle spiral spring oil ring, and the spring pitch is adjustable in the oil ring; the three rings are arranged in a piston ring groove, and openings of the first gas ring and the second gas ring are staggered. A chrome-base ceramic composite plating layer is plated on the outer circle face of the first gas ring, and the ceramic particle content reaches 5-6 percent in the chrome-base ceramic composite plating layer. In the invention, the piston ring can bear larger heat load and mechanical load; when the piston ring and a cylinder-wall oil film are in a bound state, a cylinder scuffing phenomenon can not be generated, meanwhile, because the high-hardness ceramic particles are inlaid, the wear resistance is greatly increased, and the invention can satisfy the high-performance requirement of a modern engine and has long service, low emission and high performance.

Description

technical field [0001] The invention relates to an engine piston ring, in particular to a piston ring with a chromium-based ceramic composite coating for an automobile engine. Background technique [0002] With the development of engines, especially automotive diesel engines, toward high compression ratio, high output power, low emissions, and long life, technologies such as supercharged intercooling and electronically controlled high-pressure injection are increasingly used. Piston rings, especially the first ring, are under increasing thermal and mechanical loads. Taking the most widely used external chrome-plated piston ring as an example, when the thermal load and mechanical load exceed the normal limit of the chromium layer, especially when the oil film between the piston ring and the cylinder wall reaches a critical state, it will lead to deterioration of wear , The service life of the piston ring cannot meet the requirements, and in severe cases, fusion wear will occ...

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a chromium-based ceramic composite coating piston ring that can keep the engine in good condition throughout the working process and can solve the problem of piston ring abrasive wear

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