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■TypesNumerous varieties of Shell Type Needle Roller Bearings are available as shown in Table 1.Table 1 Type of bearingSeriesMetric seriesInch series TypeCagedFull complementStandardClosed end With seals (1)Grease retained-TLA … Z TLAMTLA … UUYTLHeavy dutyTA … Z TAM -BA … Z BAM Heavy dutyBHA … ZBHAM---YT YB YBHNote(1) hen the heavy duty type with seals or type with one seal is required, please consult IKO.the closed end Remark "W" is added to the model code to indicate that the rolling elements are of the double-row type. ExampleTAW 5045 ZShell Type Caged Needle Roller BearingsStandard typeThis type has a narrow gap between the bore of the marked-side ange of the outer ring (brand, bearing number, etc. are marked) and the shaft, which pre-vents grease leaks and the entry of foreign particles. This type has wide applications.Closed end typeThis type is completely closed on one side of the outer ring, and is ideal for use when perfect closing of shaft ends is desired.The shape of the closed end surface of the outer ring is divided into two types, and the dimensions t1 and t2 tables in illustrations shown the dimension the in apply to the bearings with the roller set bore diame-ters, Fw > 22 and Fw ≦ 22, respectively.Type with seals at both sides■Identification NumberThe identication number of Shell Type Needle Roller Bearings consists of a model code and dimensions. Examples of the arrangement are shown below.When using with inner rings, the assembled inner rings shown in the dimension tables are used. An example in this case is also shown below. Inner rings are delivered separately.Examples of identication numberExample 1Model codeDimensionsTA1820ZType of bearingRoller set bore diameter(18mm)Outer ring width(20mm)Example 2 (With inner ring)Identification number of Shell Type Needle Roller BearingIdentification number ofInner RingTA 1820 Z IRT 1520+ ■AccuracyThe outer rings of Shell Type Needle Roller Bearings are thin and therefore cannot avoid deformation due to heat treatment. It is thus not appropriate to take direct measurements of the bearing. The roller set bore diameter is measured using a plug gauge or tapered gauge after press-tting the bearing to a suit-This type has a wider outer ring than the standard able ring gauge. The gauge specications are shown type and is installed with seals consisting of a rein-in Tables 2.1 and 2.2.forcing ring and special synthetic rubber to prevent grease leaks and the entry of foreign particles.Tolerances of outer ring width C are shown in Table 3.Shell Type Grease Retained Full Complement Needle Roller BearingsThis type has full complement rollers which extend to the full width of the outer ring raceway. It can, there-fore, withstand heavy bearing loads and is most suit-able for low and medium rotational speeds as well as rocking motions. As lubricating grease is prepacked with the rollers, the bearing can be operated immedi-ately after being tted.B3
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