CYLINDER STRUCTURE OF INTERNAL COMBUSTION ENGINE

• Main Authors: NAKAYASU TETSUYA, NAKANISHI TETSUYA, ONO NAOTO, KAWAI CHIHARU, ONO YUTAKA, NUKADA YOSHITAKA, TSUCHIDA TAKAHIRO, NAKAJO SAKAE
• Format: Patent
• Language: English; Japanese
• Published: 07.09.2015
• 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

PROBLEM TO BE SOLVED: To provide a cylinder structure of an internal combustion engine capable of restricting a deformation of a cylinder sleeve caused by a fastening stress or a thermal stress and the like and enabling a stable piston sliding to be carried out.SOLUTION: The present invention relates to a cylinder structure of an internal combustion engine in which a cylinder 5 is integrally fastened between a crank case 3 and a cylinder head 6. The cylinder 5 comprises a cylinder sleeve 31 and a cylinder barrel 33 covering a circumference of the cylinder sleeve 31. An annular sleeve thick part 32 is formed at the cylinder sleeve 31 while being protruded in a radial outward direction. At least a part of the cylinder barrel 33 is integrally formed with a barrel thick part 34 that becomes thick toward a circumferential outer direction of the cylinder barrel 33, and the sleeve thick part 32 is installed in a range where at least a part of it overlaps the barrel thick part 34 in an axial direction of the cylinder sleeve 31. 【課題】締付け応力や、熱応力等によるシリンダスリーブの変形を抑制し、安定したピストンの摺動を可能とする内燃機関のシリンダ構造を提供する。【解決手段】シリンダ５がクランクケース３とシリンダヘッド６との間に一体に締付けられた内燃機関のシリンダ構造において、前記シリンダ５は、シリンダスリーブ３１と、該シリンダスリーブ３１の周囲を覆うシリンダバレル３３とを備えている。前記シリンダスリーブ３１には、環状のスリーブ厚肉部３２が径方向外方に突出して形成され、前記シリンダバレル３３の少なくとも一部には、該シリンダバレル３３の周方向外方に向って肉厚となるようにバレル厚肉部３４が一体に形成され、前記スリーブ厚肉部３２は、前記シリンダスリーブ３１の軸方向において前記バレル厚肉部３４と少なくとも一部が重なる範囲に配設されている。【選択図】図５