| 摘要 |
<P>PROBLEM TO BE SOLVED: To keep down rotational resistance, by preventing the side surface in an axial direction of a retainer 3b, and a thrust raceway surface 25, from coming into contact with or coming close to each other in a large area. <P>SOLUTION: The retainer 3b is constituted by assembling both first and second retainer elements 5d and 6d, and both first and second round rings 12b and 15b are mutually made tilted. Then, the thickness of the retainer 3b in the axial direction is made the greatest at the inner end in the radial direction. When the retainer 3b is displaced in the axial direction, the side surface in the axial direction of the retainer 3b and the thrust raceway surface 25 come into contact with or come close to each other only at the inner end in the axial direction. By narrowing down an area of an oil film covering over between both surfaces, the rotational resistance due to shearing resistance of an oil film is reduced. <P>COPYRIGHT: (C)2012,JPO&INPIT |
