| 摘要 |
1512126 Seals NIPPON OIL SEAL INDUSTRY CO Ltd 20 July 1976 [30 Aug 1975] 30109/76 Heading F2B A shaft 21, e.g. for supporting a tread guide roller of a bulldozer, &c., is sealed against loss of lubricant and ingress of foreign matter by an assembly comprising a floating ring 41 of generally L-shaped cross-section with a surface 42 pressed into sliding contact with another surface by a rubber or other elastomeric sealing ring having a cylindrical bore, a cylindrical outer surface, and front and rear surfaces 54, 56 both extending outwardly from the bore in a direction away from a flange 43 of the ring, and the rear surface having at least one annular groove 30. The arrangement is stated to enable a desired axial pressure to be obtained without requiring close tolerances on the dimensions of the components or the hardness of the rubber &c. The initial shape of the sealing ring may be such that in cross-section the surface 54 is convexly curved, as shown, or linear, but in either case the surface is convex when the ring is axially compressed. The grooves may be V-shaped, as shown, or have curved or flat bottoms. As shown, the surface 42 is in sliding contact with the corresponding surface of a similar ring but it may alternatively coact with a fixed ring.
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