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US4028963A Engine balancer 失效
发动机平衡机

Engine balancer
摘要:
Balancer shafts are provided on the right and left of the crank shaft of an engine and so as to be driven thereby. Each balancer shaft has a balance weight divided into two portions, one on either side of a bearing supporting the balancer shaft. This construction protects the bearings from undesirable wear.
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