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方孔中轴是上世纪最为常见的中轴规格,在车架的五通里,中轴相当于一个转换接口,让车架和牙盘能按我们期望的方式传递力量。方孔中轴因为两头都是正方形,所以容易识别。它是在传统的销钉式中轴的基础上通过改进而来的,销钉式中轴是通过单颗销钉对牙盘进行锁紧,因接触面较小而容易发生松动进而损坏,现在只能见于相当老式的民用车中。
The square hole axis is the most common shaft specification of the last century. In the frame of the five links, the central axis is equivalent to a conversion interface, so that the frame and the crankset can transmit power in the way we expect. Square hole axis because both ends are square, so easy to identify. It is based on the traditional dowel-shaped axis through the improvement from the pin-shaped axis is through a single pin on the locking plate, due to the smaller contact surface is prone to loosening and damage, and now only seen in Pretty old-fashioned civilian car.