Cage slip of a contra-rotating roller bearing

Includes bibliographical references (page 11)In a conventional bearing one race is fixed, while the other race\ud rotates. However, in a contra-rotating bearing the inner race rotates\ud in one direction and the outer race rotates in the opposite direction.\ud The advantages of the contra-rotating bearing over the conventional\ud one are increased efficiency and reduced torque loads. The disadvantages are possibly increased weight and complication. A contra-rotating bearing test apparatus was designed and manufactured\ud for a 115 mm bore roller bearing. The cage (separator),\ud located between the raceways, maintains uniform separation between the rollers. Slip occurs when the rollers slide in addition to rolling\ud between the raceways. This causes wear and sometimes premature\ud failure of the bearing. Radial preloading simulates loading that the\ud bearing might be subjected to while supporting a shaft. The purpose \ud of this apparatus was to determine the effect that radial preloading\ud has on cage slip. It was concluded that increasing the preload causes\ud cage slip to decrease