| 摘要 |
A balancer shaft of an engine includes a pair of journal portions, a first stage balance weight and a second stage balance weight, wherein the first stage balance weight formed between the journal portions and eccentrically arranged to an axis, the second stage balance weight formed on a center part of the first stage balance weight in the axis direction and projects outward from the first stage balance weight in the radial direction, and the balancer shaft has a recess portion on the opposite side of the eccentricity direction.
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