Engine

摘要

An engine includes an engine block having a crankcase, which has a first bearing on one sidewall and an opening on the other sidewall to assemble a crankshaft. A case cover is coupled to the crankcase by a plurality of bolts to close the opening, and which has a second bearing. Two knock pins are fit into the crankcase and the case cover over their joint faces at locations closer to a cylinder bore in the engine block than the second bearing. The knock pins define the position for coupling the crankcase and the case cover to each other and contribute to an increase in rigidity of the case cover. The supporting strength for the crankshaft is increased and the weight of the case cover is reduced.