这种链条的铰链由滚动副组成，具有减磨、耐磨性能。
The joint of this chain is composed of a rolling pair, so that the friction is lower.
本文引入平面瞬心副（纯滚动副），提出了平面机构结构公式的新含义。
This paper gives a new explanination to the structural formula of plane mechanisms with the help of introducing the rolling pair.
介绍了直线滚动导轨副的结构、工作原理、选用方法及其常用的安装方式。
This paper introduces the structure, working principle, selecting method and common erecting mode of the straight-line rolling guide set.
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