No doubt the bushing constriction of roller chain would be of great advantages for ensuring its reliable connection, but it would exert a bad influence on the quality of roller chain.

套筒滚子链套筒的颈缩对保证联接牢固度固然有好处，但对链条的质量却产生不良影响。

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This paper briefly reviews several calculation methods for roller chain drive, and discusses calculation principle of finite service life for roller chain.

本文扼要评述了几种链传动计算方法，讨论了钻机链传动的有限寿命计算原理。

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Each free roller or discharge roller has its separate driving motor and reducing gear for chain wheel and chain driving system.

每个自由辊或出坯辊由各自的电机、减速机通过链轮链条驱动。

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