MASS BALANCING DEVICE FOR AN INTERNAL COMBUSTION ENGINE

摘要

The invention relates to a mass balancing device for balancing free inertial forces and/or free moments of inertia of a reciprocating internal combustion engine (1). The mass balancing device comprises two balancer shafts (3, 4) rotating at the same rotational speed in opposite directions of rotation, and a transmission (5) arranged between the crankshaft (2) of the internal combustion engine and the balancer shafts. The transmission drives the balancer shafts at a transmission ratio of crankshaft rotational speed to the balancer shaft rotational speed that is non-uniform over the crankshaft angle such that the angular speed of the balancer shafts is at the maximum at the piston dead centres. The mass balancing device is intended to be configured for an internal combustion engine in multicylinder design and the mean value of the transmission ratio is intended to be 1:2.