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Piston ring and piston device

A technology of piston rings and pistons, which is applied in the field of piston rings, can solve the problems of insufficient reduction of vertical material aggressiveness, reduction of film friction coefficient, rough surface of piston materials, etc., achieve excellent aluminum adhesion prevention effect, and inhibit wear and thermal decomposition , Excellent wear resistance

Inactive Publication Date: 2012-08-22
RIKEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the abrasion resistance of the film is low, it is difficult to maintain the film for a long time, and it is difficult to maintain the effect of preventing aluminum adhesion
In addition, in order to suppress the wear of the coating, there is a limit to the amount of solid lubricant added, and there is a limit to the reduction of the friction coefficient of the coating.
Therefore, at high temperatures, the surface of the piston material whose hardness has decreased becomes rough, which may cause further aluminum adhesion.
[0010] In addition, even the coatings of Patent Documents 3 and 4 cannot sufficiently reduce the aggressiveness to the counter material, and the surface of the counter material becomes rough at high temperature, and the coating itself may disappear due to abrasion or thermal decomposition.
[0011] Thus, at this stage, there is no piston ring that can maintain a high aluminum adhesion prevention effect for a long period of time in a high-power engine

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] A CrN film with a thickness of approximately 30 μm was formed on the outer peripheral surface of a piston ring made of low-chromium steel by ion plating. 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 of the piston ring other than the outer peripheral surface.

[0055] Alumina (Al 2 o 3 ) powder was added to polyimide (PI) varnish (RIKACOAT SN-20 manufactured by New Nippon Chemical Co., Ltd.), and after fully stirring using a mixer, it was passed through a three-roll mill with the roller interval adjusted to the minimum, thereby A coating liquid is prepared. Here, the amount of alumina powder added was adjusted to 10% with respect to the mass of the entire film. The coating liquid was sprayed on the upper and lower sides of the piston ring on which the manganese phosphate film was formed, dr...

Embodiment 2

[0058] Films were formed on the upper and lower sides of the piston ring in the same manner as in Example 1 except that silicon carbide (SiC) powder having an average particle diameter of 0.5 μm was used instead of alumina powder as hard particles. The thickness (one side) of the obtained film was about 10 μm, and the film hardness HV was 41.

Embodiment 3～9

[0060] The average particle size used is 0.008 μm (Example 3), 0.01 μm (Example 4), 0.03 μm (Example 5), 0.05 μm (Example 6), 1 μm (Example 7), 5 μm (Example 8) ) and 8 μm (Example 9) were used as hard particles, and a film was formed on the upper and lower sides of the piston ring in the same manner as in Example 1. The obtained film had a thickness of about 10 μm. In addition, the film hardness of each film was measured, and the results are shown in Table 1.

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Abstract

Provided is a piston ring which can retain, over a long period, the excellent effect of preventing aluminum adhesion in a high-power engine. At least one of the upper and lower surfaces of a piston ring is coated with a polyimide coating in which hard particles have been dispersed. As the hard particles, use is made of alumina, zirconia, silicon carbide, silicon nitride, cubic boron nitride, diamond, or the like. The hard particles have an average particle diameter of 0.01-5 [mu]m, and the coating has a thickness of 2-30 [mu]m.

Description

technical field [0001] The present invention relates to piston rings, and more particularly, the present invention relates to piston rings for internal combustion engines. Background technique [0002] The vicinity of the first piston ring of a gasoline engine will reach a high temperature of more than 200°C due to the combustion of fuel. In an internal combustion engine, at such high temperatures, due to combustion pressure, repeated collisions occur between the piston ring and the ring groove surface of the piston (hereinafter referred to as "ring groove surface"), and at the same time, the piston ring surface and the ring groove surface Slip occurs in the circumferential direction. [0003] figure 1 Shows the measurement results of the roughness of the ring groove surface. On the surface of the ring groove, there are protrusions with a height of about 1 μm produced by the turning tool by the turning tool at an interval of 0.2 mm. In order to reduce the weight of the v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16J9/26F02F5/00
CPCF16J9/26C10M107/42C10M2201/041C10M2201/061C10M2201/062F16J1/08
Inventor 佐佐木隼一小野敬
Owner RIKEN CO LTD
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