The early form of linear motion bearings was a row of wooden poles placed under a row of skids. Modern linear bearings work on the same principle, except that they sometimes use balls instead of rollers. The simplest type of rotary bearing is the bush bearing, which is simply a bushing between the wheel and the axle. This design was subsequently replaced by rolling bearings, which replaced the original bushing with a number of cylindrical rollers, each of which acted like a separate wheel.
This paper is organized by guangzhou disolick bearing trading co., LTD