Abstract: Through the wearing experimentof theequal and changing diameter floatingring sliding bearing under the same condition,the mulitifactor experimental analysis is conducted with changing such parameters as operational ratory speed, inner and outer clearance, the ratio of inner and outer clearance, the wearing amount under the condition of equal pressure and the other factors. It is revealed the no matter how the rotary speeed changes, to change diameter bearing, the avearage wearing amount is relatively small when the inner clearance is bigger and the outer clearance smaller, but to the equal diameter bearing, the wearing amount is smaller when the clearance smaller.The general tendency is the wearing amount of the changing diameter beaRIng is much less than that of the equal diameter bearing,based on the result, it is concluded that the changing diameter beaRing is easy to form a dynamic pressure lubricating film, and its wearing amount and the friction power loss are much less than the equal diameter bearing's, which implies the load capacity of the changing diameter floatingring bearing is greater than that of equal diameter floatingring bearing, the ratio of the inner and outer clearance of floatingring bearing should be between 1.17-1.20, as the increase of rotary speed, the operating stability of the bearing can be improved and the wearing decreased.

Key words: oil wedge, floatingring, sliding bearing, wear, clearance ratio