Piston ring

A piston ring and plate-shaped technology, applied to the field of piston rings for internal combustion engines, can solve the problems of insufficient durability, inability to maintain the prevention of aluminum adhesion for a long time, and difficulty in maintaining the film for a long time, and achieve an excellent effect of preventing aluminum adhesion

Inactive Publication Date: 2014-05-14
RIKEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are problems in that the cost required for anodizing the piston is high, and that the initial run-in performance is poor because alumina is hard.
Therefore, the wear resistance of the coating is reduced, and it is difficult to maintain the coating for a long period of time and to maintain the effect of preventing aluminum adhesion.
Especially under high-temperature and high-load conditions, it is difficult to maintain the film for a long time and obtain the above-mentioned effects
In addition, the coating of Patent Document 3 cannot be said to have sufficient durability under high-temperature and high-load conditions, and the effect of preventing aluminum adhesion cannot be maintained for a long period of time in a high-output engine.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1）

[0044] A CrN film with a thickness of about 30 μm is formed on the outer peripheral surface of a piston ring made of low-chromium steel by ion spraying. After alkali degreasing the obtained piston ring, it was immersed in a manganese phosphate aqueous solution heated to about 80° C. for 5 minutes to form a manganese phosphate film with a thickness of about 2 μm on the surface other than the outer peripheral surface of the piston ring. Add plate-shaped alumina powder (plate-shaped filler) with an average particle size of 10 μm and an aspect ratio of 100 to polyimide varnish (RC5057 manufactured by I.S.T Co., Ltd.) as a filler (additive material), and fully carry out using a mixer After stirring, the coating solution for coating was prepared by using a three-roll mill with the minimum roll interval. Here, the amount of the plate-like alumina powder added was adjusted to be 10% by volume based on the entire film. The upper and lower surfaces of the piston ring on which the manga...

Embodiment 2）

[0046] Tabular alumina powder with an average particle size of 10 μm and an aspect ratio of 100 is added to a liquid obtained by diluting polyamide-imide resin (Toyobo Co., Ltd. HR13NX) with N-methyl-2-pyrrolidone (Plate-like filling material) was thoroughly stirred with a mixer, and then prepared into a coating solution for coatings by passing through a Sanbon roller mill with the minimum roll interval. Here, the amount of the plate-like alumina powder added was adjusted to be 10% by volume based on the entire film. Using the obtained coating solution, a resin-based film was formed on the upper surface and the lower surface of the same piston ring as in Example 1 by the same method as in Example 1. The thicknesses of the coatings on the upper surface and the lower surface of the piston ring were both about 10 μm.

Embodiment 3）

[0048] Except that the plate-shaped filler material was changed from alumina powder to plate-shaped silicon carbide powder (average particle size: 10 μm, aspect ratio: 100), under the same conditions as in Example 1, on the upper surface and lower surface of the piston ring, A resin film is formed on the surface. The thicknesses of the coatings on the upper surface and the lower surface of the piston ring were both about 10 μm.

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Abstract

A piston ring that can maintain an excellent aluminum adhesion prevention effect over a long period in a high output engine is provided. One aspect of a piston ring according to the present invention is a piston ring in which at least one of upper and lower surfaces is covered with a resin-based film containing a plate-like filler, wherein the plate-like filler contains at least one of a group selected from alumina, silicon carbide, silicon nitride, and boron nitride.

Description

technical field [0001] The present invention relates to piston rings, and more specifically, to piston rings for internal combustion engines. Background technique [0002] Among the piston rings used in internal combustion engines, the top ring placed closest to the combustion chamber is strongly impacted by the piston ring groove (ring groove) of the piston made of aluminum alloy due to the combustion pressure, and at the same time, the surface of the ring groove slide. High temperatures develop in internal combustion engines due to the combustion of fuel. It is known that the strength of the piston decreases due to thermal shock or the like at 200° C. or higher in the vicinity of the top ring of a gasoline engine. [0003] On the surface of the ring groove of the piston, such as figure 1 As shown, protrusions of about 1 μm are formed at intervals of 0.2 mm. This is produced by the turning operation of the turning tool. The protrusion is damaged or worn due to the knoc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16J9/26
CPCF16J9/26F16J9/12
Inventor 佐佐木隼一小野敬
Owner RIKEN CO LTD
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