Aemission spectrometer, micro-hardometer, optical microscope and scanning electron microscope were used to analyze the reason of crack on connecting rod unit assembly for piston of car engine.

采用直读光谱仪、显微硬度机、光学显微镜和扫描电子显微镜等分析手段，对失效的汽车发动机活塞连杆总成断裂原因进行了分析。

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Wire rope and assembly pulley on the flexible pumping units replace balance beam and connecting rod on regular pumping units.

柔性抽油机结构上使用钢丝绳和滑轮组替代了常规抽油机的游梁和连杆。

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The verification of assembly modeling system by taking example for piston and connecting rod indicates the feasibility and validity of the system.

本文原型系统通过发动机部件活塞连杆装配体加以验证，表明了系统的可行性和有效性。

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