Combined piston ring

A technology for combining pistons and piston rings, applied in piston rings, machines/engines, mechanical equipment, etc., can solve problems such as deformation, melting, and low heat resistance, and achieve increased processing costs, reduced heat load, and air-tightness excellent effect

Inactive Publication Date: 2013-10-02
RIKEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, if a resin material is used, the molding of a piston ring having a complex-shaped opening is relatively easy, but the heat resistance is lower than that of a metal piston ring, and under the influence of combustion gas from the combustion chamber side, especially Because resin piston rings may be partially deformed and melted on the side of the combustion chamber, they have not been put into practical use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 (E1)

[0027] Carbon fibers are mixed with powdered polyetheretherketone (PEEK) and pellets are produced in an extruder to a predetermined amount. Then, the above-mentioned pellets were used for injection molding under predetermined conditions to a piston ring having a triple-stepped opening and a straight outer circumference. Here, the surface roughness of the side surface of the piston ring was 0.4 μm in arithmetic mean roughness (Ra). A total of 50 of the obtained piston rings were placed in a predetermined jig so that two of them overlapped and one of the sides of the piston rings was in contact with the plating solution, and the outer peripheral surface was sealed with tape to perform electroless plating of Ni-P. . The thickness of the Ni-P protective film is about 20 μm. Thus, a piston ring in the shape of a triple-step opening made of a carbon fiber-reinforced PEEK material with a Ni-P protective film formed on its side was manufactured.

[0028] En...

Embodiment 2～3

[0036] Examples 2-3 (E2-E3)

[0037] In addition to replacing the electroless plating of Ni-P with electroless plating of Cu and using Si 3 N 4 Except for the dispersed Ni-P electroless composite plating, a carbon fiber-reinforced PEEK piston ring in the shape of triple stepped openings was produced in the same manner as in Example 1. Regarding the type of protective film, the thickness of the protective film, the blowby amount at 4,000 rpm in the engine test (1), and the surface of the combustion chamber side of the piston ring before and after the test in the engine test (2) in Examples 2 and 3 The results of roughness Rz and appearance observation are shown in Table 1 together with the results of Example 1 and Comparative Example 2. In addition, the air leakage amount of each Example is the value obtained by making the air leakage amount of the comparative example 1 into 100, and performing ratio conversion respectively.

Embodiment 4

[0038] Example 4 (E4)

[0039] In addition to electroless plating instead of Ni-P, CH 4 Gas as raw material, with H 2 Except that the gas was used as a carrier gas to form a diamond-like carbon (DLC) protective film by plasma CVD, a carbon fiber-reinforced PEEK piston ring with a triple-step opening shape was produced in the same manner as in Example 1. As a method of forming the DLC protective film on one side of the piston ring, a jig similar to the jig for electroless plating used in Example 1 was used. However, use heat-resistant tape for the tape that seals the outer perimeter. Table 1 shows the test results based on the engine test (1) and the engine test (2) similarly to Examples 2 to 3.

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PUM

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Abstract

Provided is a combined piston ring having an excellent gas seal characteristic and comprising a special gap effective for countermeasures against blow-by, wherein a combustion chamber-side side surface is not locally deformed nor melted even when receiving combustion gas from the combustion chamber side. To this end, a combined piston ring comprises a piston ring body which is produced from a high-strength heat-resistant resin and has a gap part having a step shape when viewed from the upper and lower surfaces and the outer peripheral surface, and a spring which is mounted to the inner peripheral part of the piston ring body and presses the piston ring body radially outward, and the combustion chamber-side side surface of at least the piston ring body is coated with a heat-resistant film.

Description

technical field [0001] The invention relates to a piston ring for an internal combustion engine, in particular to a combined piston ring with excellent gas sealing performance. Background technique [0002] In pistons used in internal combustion engines such as automobile engines, in order to obtain air-tightness, oil-tightness, and thermal conductivity to the cylinder bore when sliding in the cylinder bore, generally an annular groove is arranged on the outer periphery of the piston. Metal piston rings. Usually, three piston rings are installed in ring grooves, and the piston rings are provided with notches (hereinafter referred to as "openings") in part of the circumference in order to generate peripheral tension and expand when attached to the piston. In order to prevent damage to piston rings and cylinders and burns caused by port collisions during low-temperature startup and high-temperature operation of the engine, the gap between the ports needs to be greater than a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16J9/26F02F5/00F16J9/06F16J9/14
CPCF16J9/14F16J9/26F16J9/061F16J9/28F16J9/00
Inventor 冈崎史裕柴野知哉杉原弘幸小林弘幸
Owner RIKEN CO LTD
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