Patent ID: 8677969
Filing Date: 2014-03-25
Classification: F16C,F16F,Y10T

Abstract:
1. A mass-balancing device for balancing free inertial forces or free moments of inertia of a reciprocating piston internal combustion engine, comprising two balancer shafts that rotate in opposite directions at a same rotational speed with unbalanced masses that have force components that boost each other in a direction of a piston stroke and that cancel each other out in a direction orthogonal to the piston stroke, and a transmission arranged between a crankshaft of the internal combustion engine and the balancer shafts drives the balancer shafts at a transmission ratio that is non-uniform over a crankshaft angle, with the transmission ratio being the ratio of a crankshaft rotational speed to a balancer shaft rotational speed, such that an angular speed of the balancer shafts is at a maximum at piston dead centers, the mass-balancing device is configured for an internal combustion engine only in a multi-cylinder construction and an average of the transmission ratio is 1:2.