CYLINDER OF INTERNAL COMBUSTION ENGINE

• Main Authors: MOROI KAZUMI, TAMORI HIROYUKI, ANDO HAJIME, HITOSUGI EIJI, ITO MITSUO
• Format: Patent
• Language: English; Japanese
• Published: 05.11.2020
• Subjects: ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES; BLASTING; COMBUSTION ENGINES; CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; LIGHTING; MECHANICAL ENGINEERING; WEAPONS

To provide a cylinder of an internal combustion engine and a manufacturing method of the internal combustion engine capable of reducing a friction average effective pressure without performing complicated processing.SOLUTION: In a cylinder of an internal combustion engine in which a piston is vertically moved to slide on an inner wall surface, the inner wall surface is defined into an upper region as a region between an upper end of the inner wall surface and a lower surface position of a ring groove of a piston ring of a lowermost position at a top dead center of the piston, a stroke center portion region as a region between the lower surface position of the ring groove of the piston ring at a lowermost position at the top dead center of the piston, of the inner wall surface and an upper surface position of the ring groove of the piston ring of an uppermost position at a bottom dead center of the piston, and a lower region as a region between the upper surface position of the ring groove of the piston ring at the uppermost position at the bottom dead center of the piston, of the inner wall surface and a lower end of the inner wall surface, and a relative load length ratio Pmr of a cross-sectional curve representing surface roughness of the stroke center portion region is smaller than a relative load length ratio Pmr of cross-sectional curves of the upper region and the lower region.SELECTED DRAWING: Figure 2 【課題】複雑な加工を行うことなく摩擦平均有効圧を低減させることができる内燃機関のシリンダ及びそのような内燃機関のシリンダの製造方法を提供する。【解決手段】内壁面を摺動するようにピストンが上下動する内燃機関のシリンダであって、前記内壁面は、前記内壁面の上端から前記ピストンが上死点における最下位のピストンリングのリング溝の下面位置までの間の領域である上方領域と、前記内壁面の前記ピストンの上死点における最下位のピストンリングのリング溝の下面位置から前記ピストンの下死点における最上位のピストンリングのリング溝の上面位置までの間の領域である行程中央部領域と、前記内壁面の前記ピストンが下死点における最上位のピストンリングのリング溝の上面位置から前記内壁面の下端までの間の領域である下方領域に画成され、前記行程中央部領域の面粗さを表す断面曲線の相対負荷長さ率Ｐｍｒは、前記上方領域及び前記下方領域の断面曲線の相対負荷長さ率Ｐｍｒよりも小さい。【選択図】図２