Patent ID: 7017545
Filing Date: 2006-03-28
Classification: F02B,F16F

Abstract:
1. A balancer device of an engine, including first and second balancer shafts having respective weight portions thereof, a case member provided at a lower portion of an engine block supporting a crankshaft and supporting the balancer shafts, and a driving member winding around a driving rotator attached to one end of the crankshaft and a driven rotator attached to one end of said first balancer shaft so as to rotate said first balancer shaft by the crankshaft, the improvement comprising: a pair of rotational gears provided on said first and second balancer shafts so as to engage with each other, the rotational gears being located at said one end side of respective balancer shafts with respect with said weight portions of respective balancer shafts; a shaft extension portion provided integrally at said one end of the first balancer shaft so as to extend beyond said second balancer shaft, the shaft extension portion having said driven rotator attached thereto; a first bearing portion provided at said case member to support said balancer shafts at respective portions thereof near said weight portions and said rotational gears; a second bearing portion provided at said case member to support said first balancer shaft at a portion thereof near said driven rotator; upper and lower cases configuring said case member, the upper case being coupled to said engine block, the lower case being faced to the upper case; a case extension portion provided integrally at either said upper case or lower case so as to extend along said shaft extension portion of the first balancer shaft, wherein said first bearing portion is configured of a hole which is formed by respective half-split portions of said upper and lower cases, and said second bearing portion is configured of a hole which is formed integrally at said case extension portion.