Honda Motor Co., Ltd.
Internal combustion engine

Abstract:

An internal combustion engine includes: a wall body that is formed on a crankcase to accommodate a generator by sandwiching the generator between the wall body and a generator cover coupled to the crankcase from outside; a casing that includes a casing wall, the casing wall being formed on the crankcase and, at a position apart from the wall body in an axial direction of the crankshaft, facing the wall body with a space contiguous to an outer surface of the crankcase sandwiched between the casing wall and the wall body; and a balancer shaft that has an axis thereof parallel to the rotation axis of the crankshaft, and is rotatably supported by the casing while one end of the balancer shaft protrudes from the casing wall into the space. Accordingly, the engine can reduce its weight by shortening the balancer shaft as much as possible without upsetting weight balance.