JPS60196465A - Piston ring - Google Patents

Abstract

PURPOSE:To improve wear-resistance of a piston ring by forming a film layer plated with a hard particle dispersion alloy on a sliding surface. CONSTITUTION:A hard particle dispersion alloy plating layer 1 in which 5 to 45vol% of hard particles are uniformly dispersed in iron-phosphorus alloy or nickel-phosphorus alloy plating base is formed on the sliding surface of a piston ring body 2. A part of the hard particles may be displaceable with solid lubricating particles having particle size of 0.5 to 10mu. The capacity of phosphorus is preferably 0.2 to 10%. The particle size of the hard particle is preferably 0.5 to 10mu. If the capacity exceeds 45% or the particle size exceeds 10mu, abrasion of the other agent is increased to lower the strength of a film.

Description

DETAILED DESCRIPTION OF THE INVENTION A.8 Technical Field of the Invention The present invention relates to a piston ring with excellent wear resistance and a low coefficient of wear.

Conventional technology and problems The problems that arise in the function of piston rings -1- are as follows:
From the perspective of the engine as a whole, oil consumption, blow pie, and from the perspective of the piston ring itself, wear resistance, heat resistance,
Problems include oil retention and cylinder material wear. For this reason, current screw-on rings are subjected to surface treatments such as hard chromium plating, molybdenum spraying, or a nitriding shell on the steel such as Tuftride.

However, hard chromium plating has good wear resistance but has problems with heat resistance and seizure resistance, and molybdenum spraying has good heat resistance and seizure resistance but poor wear resistance. Further, although Tough 1-Lite treatment has excellent wear resistance, when cast iron or ordinary steel is subjected to nitriding treatment, the treatment temperature is raised to a high temperature, which causes undesirable problems such as deformation of the ring.

Furthermore, with conventional surface treatment techniques, if the hardness of the piston ring is partially increased in order to improve wear resistance, there is a problem in that the mating cylinder liner will wear out. This tendency is particularly noticeable when hypereutectic AQ-5j alloy is used as the cylinder liner material.

Purpose of the Invention The present invention eliminates the drawbacks of conventional hard chrome plating, Mo spraying, nitriding, etc., and provides a hard coating layer on sliding surfaces that has excellent wear resistance and has a small coefficient of friction. The present invention provides a piston ring having the following features.

20 Structure of the Invention In order to achieve the object 1-, the present invention provides hard particles in a volume ratio of 5 to 5 to 100% by volume in an iron-phosphorus alloy or nickel-phosphorus alloy plating base on the sliding surface -1- of a piston ring body. Bis 1henring and ll'l ++T! which formed a hard particle dispersed alloy plating layer uniformly dispersed within a range of 45%! The present invention relates to a piston ring in which a portion of hard particles are replaced with solid lubricant particles having a particle size of 0.5 to 10 μm.

3- The composition of the dispersion plating base will now be described.

The phosphorus content is preferably 0.2 to 10%. If it is less than 0.2%, the hardness is low and the effect of wear resistance ('l) and corrosion resistance is small.

If it exceeds 10%, the film becomes brittle, has low impact strength, and has poor adhesion.

The volume of the hard particles is 0.5 to 45%, and the particle size is preferably 0.5 to 10μ.
If the particle size is less than 0.5 μm or the particle size is less than 0.5 μm, the area of the hard particles occupying the base surface is small, and the effect of wear resistance is low. Moreover, if the capacity exceeds 45% or the particle size exceeds 1-0 μm, the wear of the mating material increases and the strength of the film also decreases.

The capacity of lubricant particles is 0.5-15% and the particle size is 0.
．． 5-10μ is suitable. If the capacity is less than 0.5% or the particle size is less than 0.51j, the lubricant will have little effect, and if the capacity is more than 15% or the particle size is more than 0μ, the wear of the plating layer itself will increase, and the coating will deteriorate further. strength also decreases. The total amount of hard particles and lubricant particles is suitably 5 to 45% from the viewpoint of wear resistance and lubricant effect.

4- Silicon nitride, silicon carbide, etc. are excellent as hard particles. As solid lubricant particles, those with a small coefficient of friction such as boron nitride, graphite, and molybdenum distributide are excellent. .

E1 Example of the invention Nominal diameter x width x thickness 77mm x ], 2 fields x 3.
Three first pressure rings made of steel with a thickness of 1.2 mm are prepared.The first step is to form a 10μ thick nickel plating on each sliding surface using the usual nickel-like plating method. As a second step, the two sides of each ring were subjected to plating treatment as described below. In all plating treatments, the plating solution was stirred so that the solid particles were uniformly distributed in the plating solution.

5- Part 1 A nickel-phosphorus alloy plating with silicon nitride dispersed therein was formed on the sliding surface of the material ring to a thickness of 120μ by electroplating using the bath composition and plating conditions shown in Table 1.
And so.

The amount of phosphorus in the plating layer was 7% in weight ratio, and the amount of silicon nitride was 25% in volume ratio.

6-Part 2 A nickel-phosphorus alloy plating with silicon nitride dispersed is formed on the sliding surface of the material link by an electroless plating method using the bath composition and plating conditions shown in Table 2 to a thickness of -〇〇μ, and a piston is formed. It was called ring B.

The amount of phosphorus in the plating layer is 7% by weight, and the amount of silicon nitride is 25% by volume.

7- Part 3 A nickel-phosphorus alloy plating with boron nitride and silicon carbide dispersed therein was formed on the sliding surface of the material ring to a thickness of 120μ by electroplating using the bath composition and plating conditions shown in Table 3 to form a piston ring C. And so.

[Table 3] The amount of phosphorus in the plating layer is 7% by weight, the amount of boron nitride is 10% by volume, and the amount of silicon carbide particles is 20% by volume.
%.

8- As a third step, piston links A, B and C
was heated at 400° C. for 1 hour to cure the entire base. This treatment resulted in a micropicchus hardness of 800 to 900.

These screws 1 Henrings A, B, and C were installed in a 4-cycle, 4-cylinder water-cooled engine with a cylinder bore diameter of 77 m, and a bench test was conducted at 5500 rpm, full load, and for 100 hours using high lead gasoline as fuel, and the outer circumference of the piston ring was confirmed. The amount of wear on the dynamic surface and inner peripheral surface of the cylinder (made of &8 iron FC25) was measured.

For comparison, piston links that were subjected to hard chrome plating, molybdenum spraying, and Tough 1-Lite treatment were also tested in the same manner.

The test results are shown in Figure 2. As is clear from Figure 2,
The piston rings A, B, and C of the present invention all have better wear resistance than the comparative screw 1 ring, and also cause less wear on the mating material. Therefore, it has excellent effects on oil consumption, blow pie, etc., especially for engines that use high lead gasoline as fuel, which requires wear resistance.

9-

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a piston ring of the present invention. FIG. 2 is a graph showing the wear of the piston ring and the mating cylinder in an actual machine test. In the figure, reference numeral 1 indicates that the piston ring 2 is a hard particle dispersed alloy plating layer. Applicant Riken Co., Ltd. 10- Kazuo Wakasugi, Commissioner of the Japan Patent Office 1. Display of the case 1982 Patent Application No. 48095 2, Title of the invention Piston ring 3, Person making the amendment Relationship to the case Patent applicant Address: 102 Chiyo, Tokyo [1 Kudankita 1, Ward 1] T 111.3
No. 5 Name: Riken Co., Ltd. 4, Date of amendment order (voluntary) 5, Number of inventions increased by the amendment 6, Subject of amendment: Brief description of drawings in the specification column 7,
Contents of the amendment (1) Change “piston ring” in line 5 of page 10 of the specification to “
Corrected to "hard particle dispersed alloy plating layer". (2) In the specification, page 10, line 6, "It is a hard particle dispersed alloy plating layer" is corrected to "It is a piston ring."

Claims (2)

[Claims] (1) Hard particles with a particle size of 0.5 to 10μ are added to the base layer of iron-phosphorus alloy plating or the base layer of nickel-phosphorus alloy plating containing 0.2 to 1-0% by weight of phosphorus at a volume ratio of 5% to 4
A piston ring having a hard particle dispersed alloy plating layer on its sliding surface, characterized by uniform dispersion within a range of 5%. (2) 5% by volume of hard particles with a particle size of 0.5-10μ in the base layer of iron-phosphorus alloy plating containing 0.2-10% by weight of phosphorus or in the base layer of nickel-phosphorus alloy plating. ~30
%, and solid lubricant particles having a particle size of 0.5 to 10μ are uniformly dispersed in a volume ratio of 5% to 15% and a total of 10% to 45%. Piston ring with dispersion phosphorus alloy plating film on sliding surface