>> P.236
■Types■Identification NumberThe types of Roller Bearings shown in Table 1 are The identication number of Roller Bearings consists available.of a model code, dimensions, any supplemental codes and a classication symbol. The arrangement Table 1 Type of bearingexamples are shown below. TypeFull Caged typecomplement For sheavesExamples of identication numberSeriesStandardWith sealNAU49TRUNAU49 … UUTRU … UUtypeNAG49──NAG49 … UNAS50 … UUNRExample 1Model codeDimensionsSupplemental codeClassification symbolNAG4910UUP6With shield────NAS50 … ZNRType of bearing Caged Roller Bearings These bearings are suitable for high-speed rotations and fluctuating loads. Also, as the axial distance between the double-row rollers is comparatively large, large moment loads can be supported.Caged roller bearings with seal incorporate seals on both sides. Synthetic resin rubber seals are excellent in the prevention of dust penetration and grease leak-age, providing an excellent sealing effect.Full Complement Roller BearingsDimension series Bore diameter numberSeal symbol (With seals on both sides) Accuracy class (Class 6)Example 2Model codeDimensionsSupplemental codeNAS5010ZZNRThese bearings are suitable for low-speed rotations or oscillating motions and heavy loads. Similar to the caged type, the structure is advantageous for support-ing moment loads.Type of bearing Dimension series The bearings with seal incorporate seals on both Bore diameter numbersides.Shield symbol (With shields on both sides)Bearing ring shape symbol (With stop rings on outer ring)Roller Bearings for SheavesThese bearings are the double-row full complement type with a low sectional height designed for use in sheaves. There are two types; the sealed type and the shield type. They can withstand heavy radial loads and shock loads at comparatively low-speed rotations, and can also withstand axial loads.They can easily be xed axially to sheaves using the stop rings of the outer ring. As the width of the inner ring is designed to be larger than that of the outer ring, they require no spacer between sheaves. The structure is stable because the double-row rollers can withstand the moment loads caused by rope transi-tion.The surfaces of these bearings are treated to have high corrosion resistance.E3
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