| 摘要 |
A balancer device for engines comprising a first and second balancer shafts (22, 22~) disposed parallel with a crank shaft (8) and having mounted thereo n a first and second balancer weights (24, 24~), the latter being driven by th e crank shaft for rotation at the same speed as the crank shaft, wherein the first balancer weight is disposed at one crank-shaft-direction end of the first balancer shaft, while the second balancer weight is disposed at the other crank-shaft-direction end of the second balancer shaft, and the first and second balancer shafts are disposed close to the crank shaft so that whe n seen in the direction of the crank shaft, part of the rotation locus of the first and second balancer weights overlaps the rotation locus of the joined portion of the crank shaft to the connecting rod (7). The first and second balancer shafts (22, 22~) also serve as fastener bolts for a split type cran k case (2a, 2b), and the first and second balancer weights are rotatably supported by their respective balancer shafts.
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