中国第一重型机械集团公司-新闻中心 关键词：双边剪；曲柄；连杆；上剪刃；轨迹 [gap=546]Key words: double-side trimmer shear；crank；connection rod；top knife；trace
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The connection rod is a telescopic structure.
连接杆为伸缩结构。
The scheme number three is: a connection rod (12) is hinged between the lower lever (5) and the upper lever (7).
方案三是：下杠杆(5)与上杠杆(7)之间铰接有连杆(12)。
Its primary functions are to reduce wear and tear between bearing and shaft, and raise longevity of shaft and connection rod.
其主要功能是减少轴瓦与曲轴间的滑动摩擦磨损，提高发动机曲轴及连杆的使用寿命。
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