Patent ID: 9068626
Filing Date: 2015-06-30
Classification: F16F,F16H

Abstract:
1. A balancer device of an internal combustion engine, comprising: a drive gear that is engaged with an input gear to which a rotation force is transmitted from a crankshaft; a balancer drive shaft to which the rotation force is transmitted from the drive gear, the balancer drive shaft having a balancer weight; a balancer drive gear that is provided so as to rotate integrally with the balancer drive shaft; a balancer driven gear that is engaged with the balancer drive gear; and a balancer driven shaft that is provided so as to rotate integrally with the balancer driven gear, the balancer driven shaft having a balancer weight, and at least one of the drive gear, the balancer drive gear and the balancer driven gear being provided, on both axial direction side surfaces thereof, with ring-shaped grooves whose diameters are different from each other, and the ring-shaped grooves being formed up to a depth from the surface of the gear at which both the ring-shaped grooves overlap each other in the axial direction.