M ining C r ushing T r ansfer P r ocessing NTN Mining Application 14 NEEDLE ROLLER BEARINGS Features PK Ser ies needle roller and cage assemb lies are widely used in constr uction machiner y ag r icultur al machiner y and h ydr aulic equipment Often n umerous needle roller bear ings are used in the planetar y gear speed reduction mechanism f or mining and constr uction machiner y Application Example Features PKJ Ser ies needle roller and pressed cage assemb lies w ere de v eloped to deal with requirements of reduced cost coupled with high dur ability f or tough applications It f eatures an outside diameter guided cage with the same plate thic kness and high r igidity as PK ser ies Features In recent y ears customers ha v e required f or bear ings that ha v e e v erincreasing capacity In response NTN created a super highcapacity needle roller and pressed cage assemb lies as the HWTJ T ype Compared to the standard design the n umber of rollers is increased b y 20 to 30 and basic load r ating b y 20 to 35 This bear ing ser ies satisfies the requirements of large basic load r ating long lif e under se v ere oper ating conditions and high r igidity Planetary speed reducer Transmission Super highcapacity needle r oller and pr essed cage assemblies PK Series needle r oller and cage assemblies PKJ Series needle r oller and pr essed cage assemblies