Needle Roller Bearings - Ntn-snr.com

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Drawn cup needle roller bearings NTN BK BKT2 Type of bearing Closed end Applied shaft diameter (mm) 350 Composition of nominal bearing number BK 20 20 C Tail code Width Inscribed circle diameter Type code Nominal bearing number BK2020C Code items and dimensions Inscribed circle diameter :20 Width : 20 C : Welding cage Remarks The bearings with tail code T2 using polyamide resin cage shall be used at allowable temperature 120˚C and, under continuous running, at 100˚C and less. BKL Standard series Closed end single side seal 1250 BK 20 18 L Tail code Width Inscribed circle diameter Type code BK2018L Inscribed circle diameter :20 Width : 18 L : single side seal This seal type (Tail code: L) is internally filled up with lithium soap base grease. The operating temperature shall range from -25 to 100˚C maximum to prevent deterioration of the seal and filled-up grease. BKZWD Closed end double-row type 1530 BK 20 30 ZW D Tail code Tail code Width Inscribed circle diameter Type code BK2030ZWD Inscribed circle diameter :20 Width : 30 ZW : Double-row cage D : Outer ring with oil hole Inscribed circle diameter DCL DCL 16 20 Inch series Open end 6.35 50.8 Width code Inscribed circle diameter code Type code DCL1620 Inscribed circle diameter :25.4 Width : 31.75 HCK Bearing series for universal joints Closed end 1020 HCK 16 22 Outer diameter Inscribed circle diameter Type code HCK1622 Inscribed circle diameter :16 Width : 22 Full complement roller type with no cage. Already filled up with specific grease. B-32
Drawn cup needle roller bearings NTN Bearing Fits It is common that drawn cup needle bearing is pressfitted in a housing by shrinkage fit so post press-fit inscribed circle diameter (Fw) comes to ISO Tolerance Rang Class F8. The post press-fit inscribed circle diameter (Fw) depends on the housing material and rigidity. It is therefore desirable to decide the interference based on the data measured in pre-testing. Where the housing rigidity is adequately high, the post press-fit inscribed circle diameter (Fw) is secured in nearly F8 range and nearly ordinary radial clearance can be got by adopting the data of bearing fit in housing and on shaft as shown in Table-1. Table 1 Bearing fit in housing and on shaft Bearing type HK,BK HMK,DCL HCK Housing Shaft Iron series Light alloy Without inner ring With inner ring N6 (N7) J6 (J7) F7 R6 (R7) M6 (M7) –––– h5 (h6) k6 k5 (j6) –––– Bearing installation Any drawn cup needle roller bearings must be pressfitted in the housing in specific position by holding a specific jig in perfect contact with the mark-stamped side face of the bearing, without fail. Further, hammering directly the bearing ring in installing (press-fitting) is not allowed absolutely. In installing, it is recommended to use a mandrel with O-ring as illustrated in Fig.1 as a press-fitting jig. The use of this mandrel would enable to insert easily any drawn cup needle bearing in a housing without risk of twisting and fall-down. Drawn cup needle roller bearing needs no a snap ring and a shoulder for positioning itself in a housing, but the bearing must be press-fitted so carefully as not to allow its side face to strike the shoulder for preventing it from deforming, where press-fitted in a housing with shoulder. 15˚ Accuracy of housing bore Because of its thin-walled outer ring, the performance of drawn cup needle roller bearing is greatly affected by the dimensional accuracy, profile accuracy and bore surface roughness of a housing in which the bearing is press-fitted. To avoid such an inverse affect, the housing bore(hole) must have the accuracy as specified in Table 2. For the shaft accuracy refer to Subsection 7.3 "Accuracy of Shaft and Housing" (on page A-39). Table 2 Accuracy of housing bore Marking side O-ring A B A Fig. 1 AD(0.20.3) mm B=Fw(00.025) mm Property Roundness (Max) Cylindricality (Max) Surface roughness (Max) Tolerance IT4 or less IT4 or less 1.6a The Type HCK for application to universal joints is fixed to the joint yoke by caulking, using a special-purposed assembler. Feel free to contact NTN for any inquiry about the special-purposed assembler (IPH Machine). Oil hole dimension in outer ring The outer rings of double-row (Tail code : ZW) needle roller and cage assembly Type HK and Type BK are provided with an oil hole to facilitate oil lubrication to the bearing. Table 3 shows the nominal oil hole diameter. Caulking Type HCK Seal Cross joint Table 3 Diameter of oil hole in outer ring (Metric system) Outer ring diameter Over incl. Nominal oil hole diameter 5 10 1.5 10 20 2.0 20 40 2.5 Yoke 40 80 3.0 80 200 3.5 Fig. 2 B-33
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For New Technology Network R corpor
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Technical Data A-001058 Needle roll
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Needle Roller Bearings
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DIMENSIONAL DATA CONTENTS Needle Ro
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Classification and Characteristics
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Load Rating and Life NTN Table 2.1
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Load Rating and Life NTN When the o
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Load Rating and Life NTN 2.10 Radia
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Calculation of Bearing Loads NTN (2
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Calculation of Bearing Loads NTN 3.
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Bearing Accuracy NTN 4. Bearing Acc
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A-27 Bearing Accuracy NTN 7 7 8 8 8
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Bearing Accuracy NTN Table 4.5 Allo
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Bearing Internal Clearance NTN 5.2.
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Bearing Fits NTN 6.4 Recommended Fi
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Bearing Fits NTN 6.5 Interference C
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Shaft Bearing and Fits Housing Desi
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Page 45 and 46: Lubrication NTN Table 8.2 Grease va
Page 47 and 48: Lubrication NTN (4) Circulating lub
Page 49 and 50: Sealing Devices NTN 9. Sealing Devi
Page 51 and 52: Sealing Devices NTN 9.2 Combined se
Page 53 and 54: Bearing Handling NTN 10. Bearing Ha
Page 55 and 56: Bearing Handling NTN the bearing fi
Page 57 and 58: Technical Data NTN 11.2 Bearings wi
Page 59 and 60: Technical Data NTN expressed in the
Page 61 and 62: Bearing Type Symbols and Auxiliary
Page 63 and 64: Needle roller and cage assemblies B
Page 65 and 66: Needle Roller and Cage Assemblies
Page 67 and 68: Needle roller and cage assemblies N
Page 81 and 82: Cage and roller type needle roller
Page 83 and 84: Needle Roller and Cage Assemblies f
Page 85 and 86: Needle roller and cage assemblies f
Page 91 and 92: Drawn Cup Needle Roller Bearings
Page 93: Drawn cup needle roller bearings NT
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Page 115 and 116: Machined Ring Needle Roller Bearing
Page 117 and 118: Machined ring needle roller bearing
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Page 121 and 122: Machined-ring needle roller bearing
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Machined-ring needle roller bearing
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Machined Ring Needle Roller Bearing
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Machined ring needle roller bearing
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Inner Rings
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Inner rings NTN Type IR d 510mm Bou
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Inner rings NTN d 1520mm Boundary d
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Inner rings NTN d 80100mm Boundary
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Inner rings NTN d 170380mm Boundary
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Inner rings NTN Inch series Type MI
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Inner rings NTN d 101.600203.200mm
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Adjustable-Clearance Needle Roller
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Clearance-adjustable needle roller
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Clearance-adjustable needle roller
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Complex Bearings
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Complex bearings NTN Bearing compon
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Complex bearings NTN B-143
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Needle roller bearings with thrust
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Needle roller bearings with angular
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Needle roller bearings with three-p
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Needle roller bearings with double-
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Needle roller bearings with double-
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Roller Followers / Cam Followers
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Roller followers: Yoke-type track r
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Roller followers : Yoke type truck
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Cam followers stud type truck rolle
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Thrust Roller Bearings
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Thrust roller bearings NTN Bearing
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Thrust roller bearings NTN B-209
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Thrust needle roller bearings NTN B
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Thrust needle roller bearings NTN B
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Thrust cylindrical roller bearing N
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COMPONENTS Needle Rollers/Snap Ring
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Needle rollers NTN Application of n
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Needle rollers NTN DW 4.55mm Bounda
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Snap rings NTN For shaft Type WR Be
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Snap rings NTN For housing Type BR
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Snap rings NTN Bearing numbers Boun
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Seals NTN Type G Type GD Type G Typ
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LINEAR BALL BEARINGS: Solid, Drawn
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Linear Ball Bearings NTN Components
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Linear Ball Bearings NTN Components
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Solid type linear ball bearings NTN
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Machined cup linear ball bearings N
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Linear ball bearings, stroke type N
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Machined ring linear ball bearings
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Linear flat rollers NTN Stopper Fig
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Linear flat rollers NTN Type BF Typ
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Linear roller bearings NTN Type RLM
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One-way Clutches Tension Pulleys, B
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One-way clutches NTN Shaft and hous
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One-way clutch miniature type NTN T
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Bottom roller bearings NTN Type FRI
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Bottom roller bearings NTN Type FRI
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Tensioner pulleys for textile machi
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Contents of Appendix Approximate co
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Appendix NTN ˚C-˚F temperature co
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C-5 Appendix NTN Standard ball Hult
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Appendix NTN Unit system Quantity P
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Appendix NTN Viscosity conversion t
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Appendix NTN Ordinary tolerance for
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Appendix NTN High Low Hig
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Appendix NTN H7 H8 H9 H10 H11 H13 J
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