>> P.136
Needle Roller Cages for Big End KT…EGThese roller cages are subjected to acceleration and deceleration during their rotating and epicyclic motion due to crank shaft rotation. To withstand such condi-tions, they are made of a special alloy and are light-weight with high rigidity.They are guided on their outer periphery surface with superior lubricating properties. For the purpose of using them under severe condi-tions such as high rotational speed and stringent lubri-cation, bearings plated with non-ferrous metals are also available on request.High-load capacity and high-rigidity cages to be used for racing motor cycles (See the photo bellow.), split needle cages for solid (one-piece) type crank-shafts and other special specication cages of various types are also available. Please consult IKO when required.High-load capacity and high-rigidity cage KTZ … EGExamples of identication numberModel codeDimensionsSupplemental codeKT222816EGB2Type of bearingRoller set bore diameter(22mm)Roller set outside diameter(28mm)Width of cage(16mm)Tolerance of mean value of roller dia. (See Table 2.)■AccuracyThe diameter tolerances of needle rollers of Needle Roller Cages for Engine Connecting Rods are classi-fied as shown in Table 2. When the classification symbol is not indicated in the identification number, the classication symbol "B2" is applied.The tolerance of the cage width Bc is -0.2〜-0.4 mm. But cages with marks in the Bc column in the dimension tables are manufactured with the following width tolerances.Needle Roller Cages for Small End KTV…EG●:0〜-0.2 mm■:-0.1〜-0.3 mmThese roller cages oscillates at high speeds within a limited loading zone under heavy shock loads. Thus, these cages are designed to be lightweight and have high rigidity with a well-balanced structure. In these cages, a number of needle rollers having a small diameter are incorporated to reduce the rolling con-tact stress in the loading zone.Needle Roller Cages for Small End are classied into two types, the outer surface guide type and the inner surface guide type. This classication is shown in the table of dimensions.In the outer surface guide type, the cage is guided by the sliding contact between the inner surface of the connecting rod and the outer surface of the cage.In the inner surface guide type, the cage is guided by the sliding contact between the outer surface of the pin and the inner surface of the cage.■Identification NumberThe identication number of Needle Roller Cages for Engine Connecting Rods consists of a model code, dimensions and any supplemental codes as shown below.C19Table 2 Tolerances of needle roller diameterunit: μmClassClassification symbol(1)Tolerance of mean value of roller dia. (2)StandardSemi-standardB 2B 4B 6B 8B100〜- 2-2〜- 4-4〜- 6-6〜- 8-8〜-10Notes(1) he classication symbol is indicated at the end of the identication number.(2) olerances for circularity are based on JIS B 1506 (Rolling bearings - Rollers).■ClearanceRadial internal clearances are selected according to the type of engine and the operating conditions (rota-tional speed, load, lubricating conditions, etc.). If a bearing is used with an inadequate clearance, bearing troubles such as seizure, early flaking and noise increase may occur, leading to an engine failure. Therefore, it is necessary to select the clearance carefully according to test results and experience.
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