Self-aligning clutch release bearing assemblies The self-aligning clutch release bearing has the advantage of long service life, and light in weight; it can reduce the noise level and abrasion of the matching parts. The set of angular contact balls is the core of the bearing. The features of the bearing are as follow. An plastic cage is used to keep apart and guide the balls in an angular contact ball bearing, it is lighter than the traditional steel cage and can be self-lubricated, so it perform very well even under bad lubricate conditions. There is the self-aligning inner ring which can rotate in the bearing. In view of the kinetics it is superior to the outer ring which can rotate in the bearing. The centrifugation that causing by rotating the outer ring against the grease will be avoided. The sleeve is made of the cast iron or the reinforced polyamide 66 which is lighter than the cast iron and h as the good sliding performance, the grease can be omitted between the bearing sleeve and the metal front guiding cover muff made of the aluminum alloy. The general type clutch release bearings use grease for lubrication; dust and grinding particulates are easy to gather and stuck inside the bearing , in addition due to the increasing of the temperature, the incrustation and jam upon the front cover guiding muff will incur, the plastics sleeve gives the metal front guiding cover a dry sliding friction structure, it avoids the disadvantage by using grease for lubrication. Clutch release bearings using a rubber seal which can effectively avoid leakage of the grease compare with the pressed outer ring made of steel.