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Method for coating at least an inner face of a piston ring and piston ring

A piston ring and coating technology, which is applied in the field of piston rings, can solve the problems of damaging the piston ring's wiping action and reducing tangential force, and achieves the effects of low friction coefficient, improved movement, and low wear

Active Publication Date: 2016-10-12
FEDERAL MOGUL BURSCHEID
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The spring can get stuck in the channel in the groove, which impairs the wiping action of the piston ring
In addition, the tangential force required to perform the function is reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0009] For a layer thickness which advantageously achieves the stated requirements, it has been found to be in the range of 0.5 μm to 10 μm.

[0010] Particularly good results have been found in initial tests for PVD layers, where said layers are formed of nitrides and / or carbides of at least one of the metals chromium, titanium, aluminum and tungsten. The deposition of nitrides and carbides can occur alternately or simultaneously.

[0011] Particularly good results have been achieved for PVD layers having a hardness of from 800 to 4000 HV0.1.

[0012] For amorphous carbon or DLC layers, preferably a structure with at least one of the underlying layers is considered, and the base material of the piston ring firstly has a bond layer of chromium and / or titanium with a layer thickness of 1.0 μm or less. This is followed by a metal- or semiconductor-containing interlayer, i.e. a-C:H:Me with tungsten, titanium or chromium as metal, or a-C:H:X with X as silicon and / or germanium and...

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PUM

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Abstract

The invention relates to a method for at least partially coating the inner face of a piston ring, preferably consisting of cast iron or steel, by applying PVD by at least one of the PA-CVD, glow discharge and / or HIPIMS methods and / or DLC coating. The piston ring has a coating formed at least partially on the inner face of the ring, said coating being a PVD and / or DLC coating preferably applied by PA-CVD, glow discharge and / or HIPIMS.

Description

technical field [0001] The invention relates to a method for coating at least the inner surface of a piston ring and to a piston ring. Background technique [0002] The piston ring to be coated according to the invention is typically provided as part of a two-piece oil wiper ring in a piston of an internal combustion engine. The actual piston rings, which are in sliding contact with the cylinder or cylinder liner, are pressed against the cylinder liner by helical compression springs located on the inside. Thus, at the inner face of the piston ring, relative movement occurs between the piston ring and the helical compression spring due to the dynamic pressure during engine operation. This movement can lead to so-called secondary wear, which can manifest itself in the form of channels in the grooves on the piston rings and in the form of material erosion on the springs. The spring can get stuck in the channel in the groove, which impairs the wiping action of the piston ring....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C16/02F16J9/00
CPCF16J9/26H01J37/3467C23C16/0272
Inventor 迪尔克·巴伦罗伊特马卡斯·肯尼迪马卡斯·凯勒拉尔夫·拉姆斯
Owner FEDERAL MOGUL BURSCHEID
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