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Needle Roller Bearings ●Needle Roller Bearings ●Needle Roller Bearings ●Needle Roller Bearings 1. Characteristics and types of needle roller bearings 2. Handling and accuracy of needle roller bearings Needle roller bearing are rolling bearings which oscillating motion due to their low moment 2.1 Required accuracy and surface When steel is surface-hardened by carburizing have small diameter cylindrical rolling elements of inertia. Types of needle roller bearings are hardness of raceway surfaces or carbonitriding, the depth from the surface to whose length is relatively long compared with shown in the table below. This catalog provides 550 HV is defined as effective case depth per their diameter. dimension tables for the representative bearing For applications using needle roller bearings, JIS. The minimum value of the effective case Needle roller bearings have a small cross- types indicated by blue text in the table below. the outer diameter of the shaft or the inner depth is roughly estimated using formula (1). sectional height and have a larger load capacity For more information about needle roller diameter of the housing or the gear is and rigidity than other types of rolling bearings bearings, see the special catalog issued separately sometimes used directly as a raceway surface. Eht min ≧ 0.8Dw（0.1 ＋ 0.002Dw）………（1） for their relative size. They are also suitable for “Needle roller bearings (CAT. No. 2300/E).” Table 1 shows the accuracy, surface roughness, and surface hardness required for raceway Where: Page of Eht Shaft bearing surfaces in order to keep radial clearance min : Minimum effective case depth, mm Bearing type Type code diameter dimension within the prescribed allowable tolerance range Dw : Roller diameter, mm table after needle roller bearing installation, and Needle roller bearing K，K…T2，K…S，KMJ…S，K…ZW， 3～285 E-12～25 to ensuring high rotational accuracy. To set a Needle roller bearings have low allowable with cage KV…S，KV…ZWS，K…L1 surface hardness of the raceway surface from 58 misalignment because the ratio of roller Connecting rod needle PK，KBK，GPK，KMJ…S，KBK，KV…S to 64 HRC and obtain a sufficient load capacity, length to roller diameter is high. For normal roller bearings with cage apply appropriate heat treatment to materials applications, bearing misalignment must not HK，HMK，HK…ZWD，HMK…ZWD， Drawn cup as shown in Table 2. exceed the values shown in Table 3. BK，BK…ZWD，HK…L，HMK…L， 3～ 50 E-26～33 needle roller bearings Radial roller HK…LL，HMK…LL，DCL，HCK Depending on the usage conditions, the Table 3 Allowable misalignment of needle bearings RNA48，RNA49，RNA49…R，RNA59，RNA69…R，NK，NK…R， bearing function may not be satisfactory even Solid type NA48，NA49，NA49…R，NA59，NA69…R，NK＋IR，NK…R＋IR roller bearings 5～440 E-34～55 needle roller bearings NA49…L，RNA49…L，NA49…LL，RNA49…LL，MR，MR+MI with the following recommended values. If this NKS，NKS＋IR Bearing type Allowable misalignment applies, consult with NTN Engineering. Separable solid type RNAO，RNAO…ZW，NAO， Radial roller bearings 1/2 000 needle roller bearings NAO…ZW Table 1 Recommended accuracy of raceway surfaces Thrust roller bearings 1/10 000 Clearance adjusting Characteristics Shaft Housing RNA49…S，NA49…S needle roller bearings Dimensional accuracy IT5（IT4） IT6（IT5） Mating part dimensions must be set so that Thrust cylindrical 811，812，893，K811，K812，K893 Roundness 10～160 E-56～61 (Max.) IT3（IT2） IT4（IT3） the rolling surface does not come in contact roller bearings WS，GS，874，K874 Cylindricity Thrust roller with the recessed portion of the shaft or the bearings Abutment Thrust needle roller Radial IT3 chamfered area of the housing raceway surface. AXK11，AS，WS，GS 10～160 E-62～65 squareness bearings （ ） (Max.) Thrust IT5 IT4 Contact NTN Engineering when dimension Amin NKX，NKX…Z，NKXR，NKXR…Z，NKX+IR， Shaft diameter φ80 or below: 0.2 Complex Surface (Fig. 1) must be confirmed. Complex bearings NKX…Z+IR，NKXR+IR，NKXR…Z+IR， Shaft diameter φ81 to φ120: 0.3 bearings roughness μm Ra NKIA，NKIB，AXN，ARN Shaft diameter over φ120 : 0.4 … … … … … KR (F)，KR (F)LL，KRV (F)，KRV (F)LL，KR (F)H， Surface hardness 58 to 64 HRC KRV…(F)H，KRT，KRT…LL，KRVT，KRVT…LL， 3～ 64 Cam followers … … … … E-66～83 Housing KRVU，KRVU LL，CR，CR LL，CRV，CRV LL，CR H， (Stud diameter) Remarks: Accuracy in ( ) applies for high rotational accuracy. CRV…H，NUKR，NUKRT，NUKRU Track rollers RNAB2，NAB2，RNA22…LL，NA22…LL，NATR， Cage Roller followers NATR…LL，NATV，NACV， 5～ 50 E-84～91 Table 2 Materials used for raceways Roller NATV…LL，NACV…LL，NUTR，NUTW Representative Steel type Standard example Inner rings, needle rollers, ， ，， ， ， ， ， ， ～ High carbon chrome Components IR MI F WR BR G GD LEG LEGD D-24 27 SUJ2 JIS G 4805 snap rings, seals bearing steel Shaft SK85 Shaft recess width Linear motion KLM，KH，KD，RLM，FF，FF…ZW， Carbon tool steel JIS G 4401 Linear ball bearings (Former: SK5) bearings RF，BF Nickel chrome JIS G 4053 Amin SNCM420 molybdenum steel (Former: JIS G 4103) Textile machinery Bottom roller bearing JPU…S，FRIS，FR JIS G 4053 Chrome steel SCr420 bearings tension pulleys (Former: JIS G 4104) Chrome molybdenum JIS G 4053 Note: 1. Bearings with polyamide resin cages (supplementary suffix code: T2/example: HK0408FT2) must be used at an allowable temperature SCM420 Fig. 1 Dimension Amin of 120°C or below or 100°C or below for continuous use. steel (Former: JIS G 4105) 2. Bearings with an attached synthetic rubber seal and filled with grease inside (supplementary suffix code: L or LL/example: NATR20LL/3AS) Stainless steel SUSU440C JIS G 4303 must be used at an allowable temperature of -20 to 120°C or 100°C or below for continuous use. E-2 E-3 ●Needle Roller Bearings ●Needle Roller Bearings Table 5 Diameter dimensional tolerance and When a plug gauge is used for the 2.2 Needle roller bearing with cage classification of needle rollers 2.3 Drawn cup needle roller bearings measurement of the roller inscribed circle Label color Tolerance range (μm) Classification These needle roller bearings include needle The outer ring of drawn cup needle roller diameter (Fw), the dimension of the go side Red ‒0 to ‒ 2 rollers and cages that guide and hold the needle Navy ‒1 to ‒ 3 bearings is formed by precision drawing from is the lower limit of the dimensional tolerance Standard rollers. The structure is lightweight and compact Blue ‒2 to ‒ 4 a thin steel plate, and is designed to have an of the roller inscribed circle diameter, and Black ‒3 to ‒ 5 because no inner ring or outer ring is used and White ‒4 to ‒ 6 appropriate accuracy for its intended function the dimension of the no-go side is the value the shaft and the housing are used as raceway Gray ‒5 to ‒ 7 when press-fit into a rigid housing. obtained by adding 2 μm to the upper limit of Green ‒6 to ‒ 8 Sub standard surfaces. Brown ‒7 to ‒ 9 Therefore, it is meaningless to measure the the dimensional tolerance of the roller inscribed Table 4 shows recommended fits for this Yellow ‒8 to ‒10 dimensional accuracy of the bearing itself circle diameter. bearing type, and Table 5 shows the diameter before press fitting. After pressing into a ring Since the outer ring is formed by a thin dimensional tolerance and classification of When a caged needle roller bearing is used as gage (with wall thickness of 20 mm or more) steel plate, the safety factor (S0) when the needle rollers. See section 2.1 for the accuracy a single body to be directly guided in the axial having appropriate dimensions, the bearing bearing is used must be S0 ≧ 3 for standard and surface hardness necessary for shafts and direction by a shaft shoulder (Fig. 2), any part accuracy is evaluated by measuring the roller specifications, and S0 ≧ 2 must be maintained housings serving as the raceway surfaces for coming into contact with the cage side surface inscribed circle diameter (Fw) with a plug for the carburized/quenched specification these bearings. must be sufficiently finished without burrs. For gauge or a tapered gauge. (premium shell bearing1)). The needle roller diameter variation included high speed or heavy load operation, the contact Recommended fits for drawn cup needle in a single assembly is within 2 μm, and the surface is hardened and finished by grinding. roller bearings are shown in Table 6, and 1) Premium shell bearings standard classification shown in Table 5 will be When a cage is to be guided in the axial recommended shaft and housing accuracy is For details, see the special catalog issued separately “ .” (Suffix supplied if there is no particular designation. direction with a snap ring (Fig. 2), a thrust ring is shown in Table 7. Tables 8.1 and 8.2 show the Premium shell bearings (CAT. No. 3029/JE) code F is added to the bearing number.) When two or more of the same bearings are to used between the cage and the snap ring so that dimensional tolerances of the ring gauge inner be used in tandem arrangement, it is necessary the snap ring lugs do not come in contact with diameter dimension and the roller inscribed Table 8.1 Accuracy of drawn cup needle roller to use bearings having rollers of the same the cage directly. circle diameter (Fw) with respect to the standard bearings (1) Dimensional tolerance of roller inscribed circle diameter classification promote equal load sharing.
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