INTERNAL COMBUSTION ENGINE STRUCTURE

To provide an internal combustion engine structure capable of reducing rotational resistance of a rotating member even when the rotating member is arranged at a position immersed in lubrication oil.SOLUTION: An internal combustion engine structure comprises an oil pump driven gear 43 which is rotated with drive force of an internal combustion engine 11 transmitted thereto and a plate 45 installed near the oil pump driven gear 43 in the internal combustion engine 11. The oil pump driven gear 43 is installed at a position opposite to an oil return section 18 to which oil circulated in the internal combustion engine 11 is returned. A wall section 45b of the plate 45 is arranged between the oil pump driven gear 43 and the oil return section 18.SELECTED DRAWING: Figure 3 【課題】回転部材を潤滑用のオイルに漬かる場所に配置した場合でも、回転部材の回転抵抗を低減することが可能な内燃機関構造を提供する。【解決手段】内燃機関１１の内部に、内燃機関１１の駆動力が伝達されて回転するオイルポンプ被動ギア４３と、オイルポンプ被動ギア４３の近傍に設けられたプレート４５とを備えた内燃機関構造において、オイルポンプ被動ギア４３は、内燃機関１１内を循環したオイルのオイル戻り部１８と対向する位置に設けられる。オイルポンプ被動ギア４３とオイル戻り部１８との間には、プレート４５の周壁４５ｂが配置されている。【選択図】図３