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Oil ring for internal combustion engine

A technology for internal combustion engines and oil rings, applied to piston rings, mechanical equipment, engine components, etc., can solve the problems of reduced strength of the main body of the oil ring, hindering the detachment of engine oil, blocking the oil return hole, etc., and achieve the effect of fuel consumption rate

Active Publication Date: 2013-01-02
NIPPON PISTONRING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, such a two-piece oil ring is arranged in a state where the coil spring is closely attached to the inner periphery of the oil ring main body, so that the oil return hole formed in the oil ring main body is largely blocked, preventing the flow through the upper side. Oil scraped off the rails and lower side rails quickly escapes to the back side of the oil ring
Also, in the two-piece oil ring, if the size of the oil return hole formed in the oil ring body is too large, the strength of the oil ring body will be reduced

Method used

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  • Oil ring for internal combustion engine
  • Oil ring for internal combustion engine
  • Oil ring for internal combustion engine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0099] In Example 1, the actual machine test of a four-cylinder gasoline engine with a displacement of 2000 cc and a cylinder bore of 86 mm was carried out, and it was confirmed that the inner peripheral surface of the coil spring accommodation recess of the oil ring has an oil return groove and the engine without an oil return groove. The engine of the oil tank, whether there is a difference in fuel consumption. And, the operation condition of the engine was 5000 rpm at full load (WOT) for ten hours. Furthermore, the combination of piston rings is a top ring, a second ring, and an oil ring. As the top ring at this time, a ring made of 10Cr steel having an axial width (h1) of 1.2 mm and a radial width (a1) of 2.9 mm was subjected to gas nitriding treatment. The second ring is a ring made of FC material with an axial width (h1) of 1.2 mm and a radial width (a1) of 3.4 mm.

[0100] In addition, for the sake of caution, the 10Cr steel constituting the top ring and the FC materi...

Embodiment 2

[0113] In Example 2, an actual machine test of a four-cylinder gasoline engine with a displacement of 1500 cc and a cylinder bore of 73 mm was carried out, and it was confirmed that the engine with an oil return groove on the inner peripheral surface of the coil spring accommodation recess of the oil ring and the engine without an oil return groove The engine, does it differ in fuel consumption. In addition, in Example 2, the engine was driven under the same driving conditions as in Example 1, and it was confirmed how the difference in the shape of the oil ring body used would affect the characteristics (fuel consumption performance) of the oil ring. Furthermore, similarly to Example 1, the piston ring used consisted of a top ring, a second ring, and an oil ring. As in Example 1, as the top ring at this time, a ring made of 10Cr steel with an axial width (h1) of 1.2 mm and a radial width (a1) of 2.9 mm was subjected to gas nitriding treatment. As in Example 1, a ring having a...

Embodiment 3

[0123] In Example 3, the same engine as in Example 2 was used. In addition, the engine was driven under the same driving conditions as in Example 2, and it was confirmed that the difference in the shape of the oil ring body used would affect the characteristics of the oil ring (fuel consumption Quantitative performance) what impact. Furthermore, similarly to Example 1 and Example 2, the piston ring used consisted of a top ring, a second ring, and an oil ring. As in Example 1 and Example 2, the top ring at this time is gas nitriding treatment of a ring made of 10Cr steel with an axial width (h1) of 1.2 mm and a radial width (a1) of 2.9 mm. ring. Similar to Example 1 and Example 2, a ring made of FC material with an axial width (h1) of 1.2 mm and a radial width (a1) of 3.4 mm was used as the second ring. In addition, as in the first and second embodiments, the oil ring of the third embodiment uses a two-piece oil ring for an internal combustion engine. As in Examples 1 and 2,...

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Abstract

In order to provide an oil ring that is for an internal combustion engine, stably obtains over the long term the ability to scrape away excess oil from the inner walls of cylinders, allowing the oil to flow down the rear surface of pistons, and can reliably reduce the amount of oil consumption during driving of the internal combustion engine, an oil ring for an internal combustion engine is used wherein: an oil ring body is provided with a coil-expander-accommodating indentation that runs along the inner peripheral surface thereof and of which the cross section in the axial direction of the oil ring is roughly semicircular; furthermore, at the inner peripheral surface of said coil-expander-accommodating indentation, an oil-returning groove is formed that is along the inner peripheral surface thereof and that smoothly returns scraped-off oil to the rear surface of the piston; and in said oil-returning groove, in a cross-section in the axial direction of the oil ring, the outer peripheral shape thereof is configured from lines and curves that connect said lines.

Description

technical field [0001] The invention relates to an oil ring for an internal combustion engine with a two-piece structure consisting of an oil ring main body and a spiral support spring. Background technique [0002] For a long time, with the market demand for improving fuel efficiency, piston rings used in internal combustion engines have been required to achieve smooth reciprocating motion of the piston in the cylinder and to reduce friction on the inner wall of the cylinder. Therefore, for the internal combustion engine oil ring that has the function of scraping off excess oil on the inner wall of the cylinder and letting it flow down the inner side of the piston, it is also necessary to reduce the friction generated between it and the inner wall of the cylinder to achieve fuel efficiency. In order to achieve the improvement of oil consumption while realizing the reduction of fuel consumption, the thinning and widening technology of reducing the width of the oil ring main ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16J9/06F02F5/00F16J9/26
CPCF16J9/20F16J9/062F16J9/26
Inventor 宫本护柴田士郎横川弘通小川胜明
Owner NIPPON PISTONRING CO LTD
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