Combined self-cooling self-lubricating linear bearing

The invention provides a combined self-cooling self-lubricating linear bearing. The linear bearing is characterized in that a plurality of ball rotating assembly mounting grooves are uniformly distributed in the axial direction of the inner surface of a bearing sleeve, each ball rotating assembly mounting groove is provided with a set of ball rotating assembly, the two ends of an inner ring of thebearing sleeve are provided with connecting threads, and end cover ventilation assemblies are arranged at the two ends of the bearing sleeve and are connected with the connecting threads. The combined linear bearing can be combined, the heat generated in the bearing can be dissipated through the ends, the number of the ball rotating assemblies can be properly increased and reduced, balls and retainers with different specifications can be replaced to meet the requirements of different diameter guide shafts, the application range of the linear bearing is enlarged, the problems that the linear bearing is inconvenient in