OIL RING

PROBLEM TO BE SOLVED: To reduce friction resistance without impairing an oil control function in an oil ring.SOLUTION: An oil ring fitted to an oil ring groove which is concavely provided on an outer circumferential surface of a piston includes: an upper side rail 16 and a lower side rail which are...

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Bibliographische Detailangaben
Hauptverfasser:	KAWASE NAOKAZU, NAKAGAWA HAJIME
Format:	Patent
Sprache:	eng ; jpn
Schlagworte:	BLASTING CYLINDERS ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING LIGHTING MECHANICAL ENGINEERING PISTONS SEALINGS THERMAL INSULATION IN GENERAL WEAPONS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To reduce friction resistance without impairing an oil control function in an oil ring.SOLUTION: An oil ring fitted to an oil ring groove which is concavely provided on an outer circumferential surface of a piston includes: an upper side rail 16 and a lower side rail which are formed in a plate-like annular shape; and an expander arranged between the upper side rail 16 and the lower side rail. Therein, outer circumferential surfaces 16C of a barrel face type are individually formed on the upper side rail 16 and the lower side rail, and a barrel amount of a first region 16Ca having a prescribed axial directional width in an outer circumferential surface of the upper side rail 16 is larger than a barrel amount of a second region having an axial directional width in an outer circumferential surface of the lower side rail.SELECTED DRAWING: Figure 3A 【課題】オイルリングにおいて、オイル制御機能を損なうことなく摩擦抵抗を低減させる。【解決手段】ピストンの外周面に凹状に設けられたオイルリング溝に取り付けられるオイルリングであって、板状の環形に形成された上サイドレール１６及び下サイドレールと、上サイドレール１６及び下サイドレールの間に配置されたエキスパンダとを備え、上サイドレール１６及び下サイドレールには、バレルフェース型の外周面１６Ｃがそれぞれ形成され、上サイドレール１６の外周面において所定の軸方向幅を有する第１領域１６Ｃａのバレル量が、下サイドレールの外周面において軸方向幅を有する第２領域のバレル量よりも大きいことを特徴とする。【選択図】図３Ａ