A method to improve the tooth shape of mill roller and adopt the built - up-welding with tungsten carbide on the curved surface of tooth apex has been introduced.
提出了一种改进榨辊齿形并在齿顶弧面上堆焊碳化钨的方法及其加工工艺。
Gm also says the mill will be "one of the quietest and most refined engines in the segment" because of an acoustic intake manifold cover and inverted-tooth camshaft chains.
另外，GM表示新引擎将是“同级之中其中一款最宁静及最精细引擎”，因为新引擎采用一个静音进气歧管盖及倒齿式凸轮轴链条。
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