*複合型/B _*複合型/B /05/25 10:10 ページ 151 Complex Bearings

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1 Complex Bearings

2 Complex bearings Complex Bearings complex bearing is comprised of a needle roller bearing of supporting radial load and a thrust bearing for supporting axial load which are assembled integrally. Comparing with individual use of a radial bearing and a thrust bearing for the same purpose, this complex bearing saves the required installation space and thereby can contribute to making the overall construction of an equipment more compact. Bearing type Applicable shaft diameter (mm) Load capacity Composition of bearing number Type NKX NKX 20 T2 Suffix T2: Resin cage Dimension code (shaft diameter) Type NKX Z Cr Ca Type code NKX 20 T2 Z Suffix T2: Resin cage Z: with dust-proof cover Dimension code (shaft diameter) Type code Type NKXR NKXR 20 T2 Suffix T2: Resin cage Dimension code (shaft diameter) Type NKXR Z Cr Ca Type code NKXR 20 T2Z Suffix T2: Resin cage Z: with dust-proof cover Dimension code (shaft diameter) Type code Type NKIA Cr Ca NKIA Bore diameter code Dimension series code Type code Type NKIB NKIB R Cr Ca Suffix R: outer ring with rib Bore diameter code Dimension series code Type code Type AXN AXN Cr Ca Outer diameter code Bore diameter code Type code Type ARN ARN Cr Ca Outer diameter code Bore diameter code Type code Each listed load capacity is subject to reference bearing bore diameter of 20. B-152

3 Complex bearings Bearing components Handling characteristic Features Inscribed circle diameter (shaft dia.) : 20 Radial bearing : Needle roller type Iron cage Thrust bearing : Ball type Resin cage Dust-proof cover : without Thrust plate : Separable Inscribed circle diameter (shaft dia.) : 20 Radial bearing : Needle roller type Iron cage Thrust bearing : Ball type Resin cage Dust-proof cover : with Thrust plate : Non-separable, integral type Inscribed circle diameter (shaft dia.) : 20 Radial bearing : Needle roller type Iron cage Thrust bearing : Cylindrical roller type Resin cage Dust-proof cover : without Thrust plate : Separable Inscribed circle diameter (shaft dia.) : 20 Radial bearing : Needle roller type Iron cage Thrust bearing : Cylindrical roller type Resin cage Dust-proof cover : with Thrust plate : Non-separable, integral type Separable thrust plate Without dust-proof cover Integral thrust plate With dust-proof cover Separable thrust plate Without dust-proof cover Integral thrust plate With dust-proof cover Can be applied to high speed running under light axial load, due to use of ball type thrust bearing. This type is identical to Type NKX except in that the thrust bearing is protected with a dust cover. Furthermore, the handling characteristic is good because the dust cover makes the thrust plate non-separable integral. Due to the use of needle roller bearing as its thrust bearing, this type can support greater axial load than NKX. This type is identical to NKXR, but its thrust bearing is provided with dust-proof cover to prevent grease scattering. Furthermore, the handling characteristic is good because the dust-proof cover makes the thrust plate non-separable and integral. Inscribed circle diameter (shaft dia.) : 20 Radial bearing : Needle roller type Thrust bearing : Angular type Integral angular bearing Inner ring separable This type is composed of needle roller bearing and angular bearing which were integrated into one unit. The angular bearing supports axial load. Hence, this type can support one-way axial load only. Best-suited to high speed and light load application. Inscribed circle diameter (shaft dia.) : 20 Radial bearing : Needle roller type Outer ring with rib Thrust bearing : Three-point contact angular type Double inner ring type Inner ring separable This type is composed of needle roller bearing and three-point contact angular bearing which were integrated into one unit. Unlike KN1A, this type can support bi-directional axial load. Inscribed circle diameter (shaft dia.) : 20 Outer ring outer diameter : 52 Radial bearing : Needle roller type Thrust bearing : Needle roller type Separable This type is a special-purposed bearing to support a precision ball screw. This type uses the side face of the radial bearing as the raceway surface of thrust bearing. This can support axial load from both directions. Inscribed circle diameter (shaft dia.) : 20 Outer ring outer diameter : 62 Radial bearing : Needle roller type Thrust bearing : Cylindrical roller type Separable This type is a special-purposed bearing to support a precision ball screw. This can support bi-directional axial load. This type is identical to AXN, but its axial load capacity is greater. B-153

4 Complex bearings Bearing Accuracy Regarding the dimensional tolerances for radial needle roller bearing, refer to Table 4.3 of 4. "Bearing Tolerances" (page A-26) for others than the characteristics described in Dimensions Table and to Table 4.4 (page A-26) for thrust bearing tolerances respectively. Manufacture of bearing Type AXN and ARN is limited to those of JIS accuracy class-5 and -4 only. (Allowable radial run-out values for Type AXN and ARN is as specified in Table 1.) Calculation of rating life The rating life (L) of any complex bearing is determined as follows. Determine individually the rating life (Lr) of radial needle roller bearing from radial load acting thereon and the rating life (La) of thrust bearing from axial load acting thereon. And determine the rating life (L) from these determined rating lives (Lr, La) using the following formula. Table 1 Allowable radial run-out values for Type AXN and ARN Unit: m Nominal bearing bore dia. d or nominal bearing outer dia. D (mm) Over Incl To be determined based on d. 2 To be determined based on D. Radial runout of 1 radial inner ring Kia Class 5 Class Allowable radial 2 run-out for outer ring Kea Class 5 Class Life La of thrust bearing Rating life L of complex bearing Life Lr of radial bearing Radial internal clearance The radial internal clearance of Type NKX+IR, NKXR+IR and NKIA is in accordance with the interchangeable clearance information in Table 5.1(1) in Sec. 5.1 Bearing radial internal clearance (page A- 30). The standard bearings are manufactured subject to the regular clearances. The radial internal clearance of Types AXN and ARN is unique to this type, and the clearance value specific to an intended bearing is found in the relevant dimension table. 1 L= (1) ( + ) Lr 1.1 La 1.1 Bearing fits Radial needle roller bearings shall be fitted on shaft/in housing in compliance with Table 2. The thrust bearing washers of Type NKX and NKXR shall be fitted in a housing with hole diameter larger by 0.5mm or over than the washer outer diameter D1 or D2. For Type NKIA and NKIB it is not allowed to make the interference greater than k5/m6. Table 2 Bearing fit on shaft and in housing (recommended) Bearing type Shaft Housing Series NKX, NKXR Series NKIA, NKIB Series AXN, ARN k5 k5 j5 K6 (M6) M6 J6 Remarks: The parenthesized housing code is applied, where high rigidity is required. B-154

5 Complex bearings B-155

6 Needle roller bearings with thrust ball bearings Without inner ring Type NKX Type NKX Z Type NKX (Open type) Type NKX Z (With cover) FW 10 70mm Boundary dimensions Basic load ratings dynamic static dynamic static mm N kgf Fw dw D D1 D2 C C1 C2 a rs min 1) Radial Cr Cor Cr Cor Note 1) Allowable minimum chamfer dimension r. 2) Max. allowable dimension of radius ra for corner roundness on shaft/housing. B-156

7 Needle roller bearings with thrust ball bearings Basic load ratings Limiting Bearing numbers Abutment Mass dynamic static dynamic static dimensions dimensions (approx.) N kgf r/min mm kg Axial grease oil Type NKX NKX Type Z Da da ras 2) Type NKX NKX Type Z Ca Cr Coa Cor Ca Cr Coa Cor grease oil NKX NKX Z max min max NKX(approx.) NKX Z NKX10T2 NKX10T2Z NKX12T2 NKX12T2Z NKX15T2 NKX15T2Z NKX17T2 NKX17T2Z NKX20T2 NKX20T2Z NKX25T2 NKX25T2Z NKX30T2 NKX30T2Z NKX35T2 NKX35T2Z NKX40 NKX40Z NKX45 NKX45Z NKX50 NKX50Z NKX60 NKX60Z NKX70 NKX70Z B-157

8 Needle roller bearings with thrust ball bearings With inner ring Type NKX+IR Type NKX Z+IR Type NKX IR (Open type) Type NKX Z IR (With cover) d 7 60mm Boundary dimensions Basic load ratings dynamic static dynamic static dynamic static dynamic static N kgf N kgf d dw D D1 D2 B C C1 C2 F a rs min 1) r1s min 1) Radial Axial Cr Cor Cr Cor Ca Coa Ca Coa Note 1) Allowable minimum chamfer dimension r. 2) Max. allowable dimension of radius ra or r1a for corner roundness on shaft/housing. Remarks: Nominal code number of inner ring comprises IR. Bore diameter outer diameter width. B-158

9 Needle roller bearings with thrust ball bearings Limiting Bearing numbers Abutment Mass dimensions dimensions (approx.) min -1 mm kg grease oil da db ras 2) r1as 2) Type Type Type NKX+IR Type NKX Z+IR min min max max NKX+IR NKX Z+IR NKX10T2+IR NKX10T2Z+IR NKX12T2+IR NKX12T2Z+IR NKX15T2+IR NKX15T2Z+IR NKX17T2+IR NKX17T2Z+IR NKX20T2+IR NKX20T2Z+IR NKX25T2+IR NKX25T2Z+IR NKX30T2+IR NKX30T2Z+IR NKX35T2+IR NKX35T2Z+IR NKX40 +IR NKX40Z +IR NKX45 +IR NKX45Z +IR NKX50 +IR NKX50Z +IR NKX60 +IR NKX60Z +IR NKX70 +IR NKX70Z +IR B-159

10 Needle roller bearings with thrust cylindrical roller bearings Without inner ring Type NKXR Type NKXR Z Type NKXR (Open type) Type NKXR Z (With cover) FW 15 50mm Boundary dimensions Basic load ratings dynamic static dynamic static mm N kgf Fw dw D D1 D2 C C1 C2 a rs min 1) Radial Cr Cor Cr Cor Note 1) Allowable minimum chamfer dimension r. 2) Max. allowable dimension of radius ra for corner roundness on shaft/housing. B-160

11 Needle roller bearings with thrust cylindrical roller bearings Basic load ratings Limiting Bearing numbers Abutment Mass dynamic static dynamic static dimensions dimensions (approx.) N kgf min -1 mm kg Axial grease oil da ras 2) Type Type Ca Coa Ca Coa Type NKXR Type NKXR Z min max NKXR NKXR Z NKXR15T2 NKXR15T2Z NKXR17T2 NKXR17T2Z NKXR20T2 NKXR20T2Z NKXR25T2 NKXR25T2Z NKXR30T2 NKXR30T2Z NKXR35T2 NKXR35T2Z NKXR40T2 NKXR40T2Z NKXR45T2 NKXR45T2Z NKXR50T2 NKXR50T2Z B-161

12 Needle roller bearings with thrust cylindrical roller bearings With inner ring Type NKXR+IR Type NKXR Z+IR Type NKXR IR (Open type) Type NKXR Z IR (With cover) d 12 45mm Boundary dimensions Basic load ratings dynamic static dynamic static dynamic static dynamic static mm N kgf N kgf d dw D D1 D2 B C C1 C2 F a rs min 1) r1s min 1) Radial Axial Cr Cor Cr Cor Ca Coa Ca Coa Note 1) Allowable minimum chamfer dimension r. 2) Max. allowable dimension of radius ra or r1a for corner roundness on shaft/housing. Remarks: Nominal code number of inner ring comprises IR. Bore diameter outer diameter width. B-162

13 Needle roller bearings with thrust cylindrical roller bearings Limiting Bearing numbers Abutment Mass dimensions dimensions (approx.) min -1 mm kg grease oil da db ras 2) r1as 2) Type Type Type NKXR+IR Type NKXR Z+IR min min max max NKXR+IR NKXR Z+IR NKXR15T2+IR NKXR15T2Z+IR NKXR17T2+IR NKXR17T2Z+IR NKXR20T2+IR NKXR20T2Z+IR NKXR25T2+IR NKXR25T2Z+IR NKXR30T2+IR NKXR30T2Z+IR NKXR35T2+IR NKXR35T2Z+IR NKXR40T2+IR NKXR40T2Z+IR NKXR45T2+IR NKXR45T2Z+IR NKXR50T2+IR NKXR50T2Z+IR B-163

14 Needle roller bearings with angular contact ball bearings Type NKIA59 d 15 70mm Boundary dimensions Basic load ratings Limiting dynamic static dynamic static dynamic static dynamic static dimensions mm N kgf N kgf min -1 Radial Axial grease oil d D C F rs min 1) Cr Cor Cr Cor Ca Coa Ca Coa Note 1) Allowable minimum chamfer dimension r. 2) Max. allowable dimension of radius ra for corner roundness on shaft/housing. Remarks: Nominal code number of inner ring comprises IR. Bore diameter outer diameter width. B-164

15 Needle roller bearings with angular contact ball bearings Bearing Abutment Mass numbers dimensions mm kg da Da Db ras 2) min max max max (approx.) NKIA 5902A NKIA 5903A NKIA 5904A NKIA59/22A NKIA 5905A NKIA 5906A NKIA 5907A NKIA 5908A NKIA 5909A NKIA 5910A NKIA 5911A NKIA 5912A NKIA 5913A NKIA 5914A B-165

16 Needle roller bearings with three-point contact ball bearing Type NKIB 59 d 15 70mm Boundary dimensions Basic load ratings Limiting dynamic static dynamic static dynamic static dynamic static dimensions mm N kgf N kgf min -1 d D B C F rs min 1) Radial Axial grease oil Cr Cor Cr Cor Ca Coa Ca Coa Note 1) Allowable minimum chamfer dimension r. 2) Max. allowable dimension of radius ra for corner roundness on shaft/housing. Remarks: 1. This complex can support bi-directional axial load. 2. The ball bearing of this complex bearing is complete with a synthetic resin cage, and the allowable operating temperature shall be 120 C and, under continuous running, 100 C or less. 3. This bearing type is the imported product from INA, Germany. B-166

17 Needle roller bearings with three-point contact ball bearing Bearing Abutment Mass numbers dimensions mm kg da Da ras 2) min max max (approx.) NKIB 5902R NKIB 5903R NKIB 5904R NKIB59/22R NKIB 5905R NKIB 5906R NKIB 5907R NKIB 5908R NKIB 5909R NKIB 5910R NKIB 5911R NKIB 5912R NKIB 5913R NKIB 5914R B-167

18 Needle roller bearings with double-direction thrust needle roller bearing Type AXN d 20 50mm Boundary dimensions Basic load ratings dynamic static dynamic static dynamic static dynamic static mm N kgf N kgf d dw D D1 T C F Dw rs min 1) r1s min 1) Radial Axial Cr Cor Cr Cor Ca Coa Ca Coa Note 1) Allowable minimum chamfer dimension r or r1. B-168

19 Needle roller bearings with double-direction thrust needle roller bearing Limiting Bearing Radial Abutment Preload Starting torque 2) Mass dimensions numbers clearance dimensions min -1 μm mm N kgf N mm kgf mm kg grease oil da Da ras 2) r1as 2) min max min max max max (approx.) AXN AXN AXN AXN AXN AXN AXN Note 2) Max. allowable dimension of radius ra for corner roundness on shaft/housing. 3) Starting torque subject to standard preload. B-169

20 Needle roller bearings with double-direction thrust needle roller bearing Type ARN d 20 70mm Boundary dimensions Basic load ratings dynamic static dynamic static dynamic static dynamic static mm N kgf N kgf d dw D D1 T C F Dw rs min 1) r1s min 1) Radial Axial Cr Cor Cr Cor Ca Coa Ca Coa Note 1) Allowable minimum chamfer dimension r or r1. B-170

21 Needle roller bearings with double-direction thrust needle roller bearing Limiting Bearing Radial Abutment Preload Starting torque 2) Mass dimensions numbers clearance dimensions min -1 μm mm N kgf N mm kgf mm kg grease oil da Da rass 2) r1ass 2) min max min max max max (approx.) ARN2052T ARN ARN2557T ARN ARN3062T ARN ARN3570T ARN ARN4075T ARN ARN4580T ARN ARN ARN ARN ARN ARN ARN Note 2) Max. allowable dimension of radius ra for corner roundness on shaft/housing. 3) Starting torque subject to standard preload. B-171

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