| 摘要 |
PURPOSE:To promote a good sealing effect and a decrease of width size, by naturally dividing an inner ring by a mutually opposed slit bordering while holding outer surface seal units to annular recessed grooves of the inner ring further bringing a lip of the outer surface seal unit into contact with a sliding circular cylinder surface of an outer ring or the like. CONSTITUTION:An inner ring 100, which provides a convex partitioning region 101 to be left in the central part, provides a spherical track 102 in both sides of said region 101. While the inner ring provides flange parts 103, coming into contact with the end surface of a spherical roll 105, in the outside of the spherical tracks 102 further circular cylinder parts 104 extending to the outside successively from the flange parts 103. And the flange part 103 forms a sliding surface 1031 and an annular part 1032 of the spherical roll 105 in the side of the track 102. While the circular cylinder part 104 forms in its periphery each annular recessed groove 1041, 1042 for mounting an outer surface seal unit 106 and a seal ring 107. Further the circular cylinder part 104 forms a slit 1046, mutually opposed in a symmetrical position of the diametric direction passing through the axial center, in the outer side of a circular cylinder surface leaving the annular part 1032 in the side of the track 102.
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