PISTON WITH PISTON RING AND INTERNAL COMBUSTION ENGINE

PROBLEM TO BE SOLVED: To reduce dispersion of oil into a combustion chamber at a piston with a piston ring.SOLUTION: A piston 18 with a piston ring is installed in a ring groove of a piston main body and includes a top ring 34 acting as a piston ring opposing against a combustion chamber under a sta...

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Bibliographic Details
Main Authors MURAKAMI GENICHI, MORITA YUSUKE, INAGAKI HIDETO, HAMA MASAHIDE, KATSUMI NORIKAZU, KAWAI KIYOYUKI, OGURO TAKASHI
Format Patent
LanguageEnglish
Japanese
Published 04.04.2016
Subjects
ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
BLASTING
COMBUSTION ENGINES
CYLINDERS
CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES
ENGINEERING ELEMENTS AND UNITS
GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS
HEATING
HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
LIGHTING
MECHANICAL ENGINEERING
PISTONS
SEALINGS
THERMAL INSULATION IN GENERAL
WEAPONS
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Summary:PROBLEM TO BE SOLVED: To reduce dispersion of oil into a combustion chamber at a piston with a piston ring.SOLUTION: A piston 18 with a piston ring is installed in a ring groove of a piston main body and includes a top ring 34 acting as a piston ring opposing against a combustion chamber under a state in which it is installed inside a cylinder 16. An outer circumferential surface 74 of the top ring 34 is formed closer to the combustion chamber side than a sliding surface 76 contacted with the cylinder and it includes a clearance forming surface 78 forming a combustion chamber side clearance 82 between it and the cylinder. At the sectional shape of the top ring 34, a position where a curvature factor or inclination of the clearance forming surface 78 varies at the end part at the combustion chamber side is applied as a reference point P1 and a sectional area S of the main combustion chamber side clearance 82 formed in a range from the combustion chamber side end edge of the sliding surface 76 to the reference point P1 is restricted in respect to an inner diameter D of the cylinder under a relation of S/D>0.00012 mm.SELECTED DRAWING: Figure 3 【課題】ピストンリング付ピストンにおいて、燃焼室へのオイルの飛散を低減することである。【解決手段】ピストンリング付ピストン１８は、ピストン本体のリング溝に配置され、シリンダ１６の内側に配置された状態で燃焼室に対向するピストンリングであるトップリング３４を含む。トップリング３４の外周面７４は、シリンダに接する摺動面７６よりも燃焼室側に形成され、シリンダとの間で燃焼室側空隙８２を形成する空隙形成面７８を含む。トップリング３４の断面形状において、空隙形成面７８の曲率または傾きが燃焼室側の端部で変化する位置を基準点Ｐ１として、燃焼室側空隙８２のうち、摺動面７６の燃焼室側端縁から基準点Ｐ１までの範囲で形成される主燃焼室側空隙の断面積Ｓは、シリンダの内径Ｄに対してＳ／Ｄ＞０．０００１２ｍｍの関係で規制される。【選択図】図３
Bibliography:Application Number: JP20140171659