Auto bearing unit is developed on the basis of stan-dard angular touching ball bearing and taperedroller bearing. It combines two sets of bearings. Ithas the following advantages: good assembly perfor-mance, omissible clearance adjustment, lightweight, compact structure, high load capacity, seal-ing, capable of preloading grease, omissible outerhub sealing and repairing-free, etc. Now it has beenwidely applied in saloon cars.