End cap device of DC motor

The utility model relates to a structural part of a direct current motor, in particular to an end cover device of the direct current motor, which solves the problems that as an outer sealing ring and a rotating shaft of the existing end cover device adopt interference fit, the disassembling of the ring needs special tools, takes time and labor, disassemble and assemble are inconvenient and the like. The end cover device of the direct current motor comprises an end cover which is supported and fixed on a rotating shaft of the motor by a bearing that is arranged in a bearing chamber of the end cover; the exterior of the bearing is further provided with an outer bearing cover; and the end cover device of the direct current motor also comprises an outer sealing ring and an inner sealing ring. The innovations of the utility model lie in that the interference of the outer sealing ring and the rotating shaft is 0.003 to 0.05; the outer bearing cover is additionally provided with a top thread hole, the thread specifi