To reduce intake resistance or exhaust resistance.SOLUTION: An engine (2) is equipped with a cylinder block (21) formed with a cylinder bore (30) storing a piston; and a cylinder head (22) forming a combustion chamber (31) ranging to the cylinder bore between the cylinder block and the cylinder head. The cylinder head has an intake port portion (32) forming an intake port communicating to the combustion chamber, and four bolt fastening holes (4) formed around the cylinder bore. The intake port portion has a shape projecting out to an outer peripheral side of the cylinder bode and curved toward one bolt fastening hole (4a) of the plurality of bolt fastening holes. The one bolt fastening hole is provided at a position rotated around a center (30a) of the cylinder bore with respect to a virtual point (9a) that is a layout reference of the bolt fastening holes, in the same direction as a bending direction of the intake port portion by a predetermined angle.SELECTED DRAWING: Figure 6

    【課題】吸気抵抗又は排気抵抗を低減すること。【解決手段】エンジン(2)は、ピストンを収容するシリンダボア(30)が形成されたシリンダブロック(21)と、シリンダブロックとの間でシリンダボアに連なる燃焼室(31)を形成するシリンダヘッド(22)と、を備える。シリンダヘッドは、燃焼室に連通する吸気ポートを形成する吸気ポート部(32)と、シリンダボアの周囲に形成される4つのボルト締結穴(4)と、を有する。吸気ポート部は、シリンダボアの外周側に突出して複数のボルト締結穴のうち1つのボルト締結穴(4a)に向かって湾曲した形状を有する。1つのボルト締結穴は、ボルト締結穴の配置基準となる仮想点(9a)に対してシリンダボアの中心(30a)を軸に吸気ポート部の曲げ方向と同じ方向へ所定角度回転した位置に設けられる。【選択図】図6


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    Title :

    ENGINE AND MOTORCYCLE


    Additional title:

    エンジン及び自動二輪車


    Contributors:

    Publication date :

    2019-02-07


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B62K Fahrräder , CYCLES / F02F CYLINDERS, PISTONS, OR CASINGS FOR COMBUSTION ENGINES , Zylinder, Kolben oder Gehäuse für Brennkraftmaschinen



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