hammer blow
名词 n.
英文释义
名词 n.
- A blow with a hammer.
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A pounding of the rails by the driving wheels of a steam locomotive caused by the inertia of unbalanced parts.
— The balancing of the engine is unusual, with the rotating masses fully balanced and 40 per cent of the reciprocating masses statically balanced by lead weights in the coupled wheels; the reciprocrating balance weights are in the same phase on both sides of the engine. This system saves balance weight and reduces the wheel hammer-blow.
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数据来源: Wiktionary