| 摘要 |
<P>PROBLEM TO BE SOLVED: To achieve a structure that sufficiently improves durability in a state of poor lubrication. <P>SOLUTION: The inner peripheral surface in areas having circumferential phases that align with respective pockets 15b of a large-diameter-side rim section 12c constituting a retainer 5e is provided with oil-storage recessions 20a, recessed radially outward, and these respective oil-storage recessions 20a are opened inside the respective pockets 15b. Further, the inner diameter of a small diameter side rim 13b is made larger than the pitch circle diameter of each conical roller 4 (4a). Furthermore, in a part of the inner peripheral surface of the large-diameter-side rim section 12c, a projection 23 projected radially inward is formed in the whole circumference. When lubrication is poor due to failure, lubricating oil left on each pocket 15b side rather than the projection 23 including the oil-storage recessions 20a part lubricates a sliding section between a large-diameter-side end face 10 of each conical roller 4 (4a) and an axial inner face 11 of a large-diameter-side flange section 8 together with a small quantity of the lubricating oil incorporated in a bearing inner space 21 from the upstream end opening thereof. <P>COPYRIGHT: (C)2012,JPO&INPIT |
