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Internal-combustion engine piston ring

A technology for piston rings and internal combustion engines, applied in the field of piston rings, can solve the problems of short life, easy failure, and the lower side of the piston gas ring is not wear-resistant, and achieves low friction coefficient, extended service life, and excellent product quality and machining accuracy. Effect

Inactive Publication Date: 2010-02-10
NANJING FAYN PISTON RING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Purpose of the invention: The purpose of the present invention is to overcome the problems existing in the prior art, and provide a piston ring with a composite coating on the lower side, which can solve the problems of the lower side of the piston gas ring in the prior art, which are not wear-resistant, have a short life, and are easily failure problem

Method used

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  • Internal-combustion engine piston ring
  • Internal-combustion engine piston ring
  • Internal-combustion engine piston ring

Examples

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Embodiment 1

[0021] figure 2 It is an enlarged cross-sectional schematic diagram of the coating on the lower side of the wedge-shaped gas ring. The present invention is described by taking a nickel-based composite coating piston ring as an example. Composite coating 2 selects Ni-X-PTFE, such as: nickel-based chemical composite coating (Ni-P-Si 3 N 4 ), can also be replaced by nickel-based polytetrafluoroethylene composite (Ni-P-PTFE), nickel-phosphorus alloy coating (Ni-P); after machining, wear-resistant layer coating, heat treatment, fine machining, surface Finished product after processing. Nickel-based composite coating technical requirements: thickness 20μm; hardness 900HV 0.1 ; The thickness difference is less than 3 μm, and the friction coefficient with the piston ring groove is 0.08; the service life of the prepared piston ring can reach 24000 hours.

Embodiment 2

[0023] The composite coating used in this embodiment is a nickel-based amorphous alloy coating (Ni-Cr-Fe-P). Electrodeposited Ni-Cr-Fe-P, finished by machining, electrodeposition coating, and polishing (here can be replaced by other existing coating technologies). The thickness of the composite coating is 30μm; the hardness is 950HV 0.1 ; The difference in thickness is less than 3 μm. The coefficient of friction is 0.2; the service life of the prepared piston ring can reach 23000 hours.

Embodiment 3

[0025] image 3 It is a cross-sectional enlarged schematic diagram of the coating on the lower side of the double-sided trapezoidal gas ring. The present invention is illustrated by taking metal nitride as an example of a piston ring with a composite coating, such as chromium nitride (CrN), titanium nitride (TiN), titanium aluminum nitride (AlTiN), chromium aluminum nitride (ALCrN) or nitrogen carbide Titanium (TiCN). For example, chromium nitride CrN is selected for the composite coating 2; the finished product is achieved after mechanical processing, nitriding treatment, physical vapor deposition, and fine machining (here can be replaced by other existing coating technologies). Metal nitride coating technical requirements: thickness 25μm; hardness 1400±200HV 0.1 The thickness difference is less than 2.5 μm, and the friction coefficient with the austenitic cast iron piston ring is 0.12; the service life of the prepared piston ring can reach 22000 hours.

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Abstract

The invention discloses an internal-combustion engine piston ring, comprising a gaseous ring and the downside of the gaseous ring is provided with composite plating, wherein the thickness T of the composite plating is not less than 5mu m and not more than 30mu m, the hardness is 800-1600HV0.1, the friction coefficient is 0.05-0.3, the composite plating comprises nickel-based composite, metal nitride, metal carbide or ceramic composite. The invention can meet the demand of promoting the explosion pressure of the internal-combustion engine, play an important role in realizing environment protection emission, increase the overall system performance and prolong the service life; the invention has simple structure, is easy to realize and is applicable to mass assembly line production; the quality and the processing precision of the product are better than the product prepared by the prior art and the method of the invention belongs to low energy consumption manufacturing technology; the method of the invention can improve the working environment of workers and reduce the pollution to the environment, thus the composite plating technology is more environmentally friendly than the technology of chromium-plating; in addition, the technology can realize large thickness, high temperature hardness, high wear resistance and low friction coefficient of the product.

Description

technical field [0001] The invention relates to a piston ring, in particular to a piston ring with a composite coating on the lower side of an internal combustion engine. Background technique [0002] The piston ring set is a key part of the internal combustion engine. The piston ring set includes an air ring and an oil ring; the air ring mainly acts as a seal. At high temperature, its outer circle and the cylinder wall have friction, and the end face and the side of the piston groove have impact vibration. Chatter friction, therefore requires good wear resistance. The materials of the piston ring matrix include alloy cast iron, ductile iron, carbon steel, stainless steel, etc. Some outer circles are plated and impregnated to increase their wear resistance. The entire outer surface of some piston rings is oxidized and anti-corrosion treated. Flash chrome plating; anti-corrosion oxidation treatment or surface overall chrome plating technology is only for anti-corrosion, aest...

Claims

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Application Information

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IPC IPC(8): F02F5/00
Inventor 宋建华曹存军张长春夏晓红
Owner NANJING FAYN PISTON RING
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