| 摘要 |
An internal combustion engine 1 includes a crankcase 10, a case cover 20R which covers a side of the crankcase 10, a crankshaft 11 and a balancer shaft 61, a balancer 6 having a balancer driven gear 62 and a balance weight 60 provided on the balancer driven gear 62 and acted upon and driven by driving force of the crankshaft 11 to rotate, and an oil pump 8 accommodated in the crankcase 10 and having an oil pump driving shaft 81 disposed in parallel to the crankshaft 11 and the balancer shaft 61. The oil pump 8 includes a pump driven gear 82. The balancer 6 has a pump driving gear 63 which has a smaller diameter than the balancer driven gear 62 and rotates together with the balancer driven gear 62. The pump driving gear 63 meshes with the pump driven gear 82. The oil pump driving shaft 81 is disposed within an area of rotation of the balance weight 60 as viewed in an axial direction thereof. Thus, the balancer shaft and the oil pump driving shaft can be disposed next to each other and the internal combustion engine can be made compact. |
