The bearing end cover is used to fix the bearing, adjust the bearing clearance and bear the axial force. ? The structure of bearing end cover has two types: embedded type and flange type. Each kind can be divided into stuffy cover and transparent cover. The invention has the advantages of simple and compact structure, no need of fixing screws, small outer diameter, light weight and short size of the overhanging shaft. However, it is difficult to assemble and disassemble the end cover, adjust the bearing clearance, have poor sealing performance, and slot the seat hole, which is time-consuming to process. Embedded bearing end covers are mostly used in places with light weight and small volume, and their structures and dimensions are shown in the following table: