INTERNAL COMBUSTION ENGINE

摘要

An internal combustion engine includes a crankcase, a case cover for covering a side of the crankcase, a crankshaft and a balancer shaft. A balancer has a balancer driven gear and a balance weight provided on the balancer driven gear and is acted upon and driven by a driving force of the crankshaft to rotate. An oil pump is accommodated in the crankcase and has an oil pump driving shaft disposed in parallel to the crankshaft and the balancer shaft. The oil pump includes a pump driven gear. The balancer has a pump driving gear which has a diameter smaller than that of the balancer driven gear and rotates together with the balancer driven gear. The pump driving gear meshes with the pump driven gear. The oil pump driving shaft is disposed within a range of rotation of the balance weight as viewed in an axial direction thereof.

主权项

1. An internal combustion engine, comprising:
a crankcase; a case cover for covering a side of the crankcase; a crankshaft and a balancer shaft; a balancer including a balancer driven gear and a balance weight provided on the balancer driven gear, the balancer being acted upon and driven by a driving force of the crankshaft to rotate; and an oil pump accommodated in the crankcase and having an oil pump driving shaft disposed in parallel to the crankshaft and the balancer shaft, the oil pump including a pump driven gear; wherein the balancer has a pump driving gear having a diameter smaller than the diameter of the balancer driven gear and rotates together with the balancer driven gear, the pump driving gear meshing with the pump driven gear; and the oil pump driving shaft is disposed within a range of rotation of the balance weight as viewed in an axial direction thereof.