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

A piston ring and coating technology, applied in the field of piston rings, can solve problems such as damage to the piston ring wiping action, reduction of tangential force, etc.

Active Publication Date: 2014-03-05
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

[0010] For the layer thickness that advantageously achieves the stated requirements, it has been found to be in the range of 0.5 μm to 10 μm.

[0011] Particularly good results have been found in initial tests for the PVD layer, where the layer is formed of nitrides and / or carbides of at least one of metal chromium, titanium, aluminum, and tungsten. The deposition of nitrides and carbides can occur alternately or simultaneously.

[0012] For PVD layers with hardness from 800 to 4000HV0.1, particularly good results have been achieved.

[0013] For the amorphous carbon or DLC layer, it is preferable to consider a structure having at least one of the following layers, and the base material of the piston ring first has a bonding layer of chromium and / or titanium with a layer thickness of 1.0 μm or less. This is followed by a metal-containing or semiconductor-containing intermediate layer, namely aC:H:Me, where tungsten, titanium, or chromium is used as the metal, or aC:H:X, where X is s...

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PUM

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Abstract

In a method for coating at least part of the inner face of a piston ring, said ring preferably consisting of cast iron or steel, a PVD and / or DLC coating is applied by means of at least one of the following methods: PA-CVD, glow discharge and / or HIPIMS. A piston ring has a coating that is formed at least on part of the inner face of said ring, said coating being a PVD and / or DLC coating that preferably has been applied by means of PA-CVD, glow discharge and / or HIPIMS.

Description

Technical field [0001] The invention relates to a method for coating at least the inner face of a piston ring and 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 scraper ring in a piston of an internal combustion engine. The actual piston ring in sliding contact with the cylinder or the cylinder liner is pressed against the cylinder liner by a helical compression spring located on the inner side. Therefore, at the inner face of the piston ring, a 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 show up in the form of channels in grooves on the piston ring and in the form of material abrasion on the spring. The spring will get stuck in the channel in the groove, which impairs the wiper action of the piston ring. In addition, the t...

Claims

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Application Information

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IPC IPC(8): C23C16/02F16J9/00
CPCC23C16/0272F16J9/26H01J37/3467
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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