Patent ID: 8601993

Claim:
An engine balancer device equipped with an inertial force balancer provided with a balancer weight rotated synchronously with a crankshaft of an engine to prevent vibration resulting from reciprocative weight of the engine, comprising: wherein the balancer weight includes a primary balancer rotated at the same speed as, and in a counter direction to the crankshaft and a first coupling balancer and a second coupling balancer for suppressing moment force resulting from the reciprocative weight of the engine, the primary balancer is a two-shaft primary balancer arranged to be divided into a front balancer weight provided on a front balancer shaft in front of the crankshaft and a weight provided on a rear balancer shaft in the rear of the crankshaft, the weight provided on the rear balancer shaft is composed of a rear balancer weight provided on the rear balancer shaft, the first coupling balancer integrally provided on a driven gear mounted on the rear balancer shaft for transmitting rotation of the crankshaft to the rear balancer shaft and the second coupling balancer integrally provided on a drive gear mounted on the rear balancer shaft for transmitting rotation of the balancer shaft to a main shaft of the engine; the rear balancer weight is arranged on an inner side of both ends of the rear balancer shaft; the driven and drive gears are provided on the same side in a one end side of the rear balancer shaft spaced apart from the rear balancer weight, and the rear balancer weight and the first and second coupling balancers are configured to cancel engine vibrations resulting from the moment force generated on the engine.