Patent ID: 9157365
Filing Date: 2015-10-13
Classification: F02B,F16F

Abstract:
1. An internal combustion engine with a balancer comprising: a crankcase having a pair of wall portions; a crankshaft supported for rotation by the wall portions and having a balancer driving gear wheel provided integrally thereon; a balancer shaft supported for rotation by the wall portions and having a balancer driven gear wheel provided integrally thereon, wherein the balancer driving gear wheel and the balancer driven gear wheel are disposed between the wall portions and wherein the crankcase is formed from upper and lower parts with respect to a parting face centered at the crankshaft and the balancer shaft is supported on one of the upper side crankcase and the lower side crankcase in a displaced relationship from the parting face; a positioning mark, which includes a set of marks provided on side faces in a same direction of the driving and driven gear wheels, is disposed near to pitch circles of the balancer driving gear wheel and the balancer driven gear wheel; and a through-hole is formed in one of said pair of wall portions at a position that opposes the positioning mark on the pitch circles of the balancer driving gear wheel and the balancer driven gear wheel, said through-hole extending through the one wall portion such that the positioning mark can be visually observed from outside of the one side wall through the through-hole, wherein an end of a female threaded hole for a fastening bolt for fastening the upper side crankcase and the lower side crankcase extends into the through-hole.