Page 204 - needle bearings

Complex bearings
NTN

Bearing Accuracy Calculation of rated life
Regarding the dimensional tolerances for radial needle The rated life (L) of any complex bearing is determined
roller bearing, refer to Table 4.3 of 4. "Bearing as follows. Determine individually the rated life (Lr) of
Tolerances" (page A-26) for others than the radial needle roller bearing from radial load acting thereon
characteristics described in Dimensions Table and to and the rated life (La) of thrust bearing from axial load
Table 4.4 (page A-26) for thrust bearing tolerances acting thereon. And determine the rated life (L) from
respectively. Manufacture of bearing Type AXN and these determined rated lives (Lr, La) using the following
ARN is limited to those of JIS accuracy class-5 and -4 formula
only. (Allowable radial run-out values for Type AXN and
ARN is as specified in Table 1.)

Table 1 Allowable radial run-out values for Type AXN and ARN
Unit: Жm
Nominal bearing bore dia. d or Radial runout of 1 Allowable radial 2
nominal bearing outer dia. D radial inner ring run-out for outer ring
(mm) Kia Kea
Over Incl. Class 5 Class 4 Class 5 Class 4
18 30 4 3 ʵʵ ʵʵ
30 50 5 4 ʵʵ ʵʵ
50 80 5 4 8 5
80 120 ʵʵ ʵʵ 10 6 Life La of thrust bearing Life Lr of radial bearing
120 150 ʵʵ ʵʵ 11 7
1 To be determined based on “d”.
2 To be determined based on “D”.
Rated life L of complex bearing

1
Radial clearance Lʹʵʵʵʵʵʵʵʵʵʵʵʵʵʵʵʵ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯(1)
1 1 0.91
The respective radial clearances of Type NKX+IR, ( ʵʵʵʵʴʵʵʵʵ )
1.1
1.1
Lr
La
NKXR+IR, NKIA and NKIB shall comply with the
interchangeable clearances specified in Table 5.1 (1) of
5.1 "Radial Clearances of Bearings" (page A-30). The
standard bearings are manufactured subject to the
regular clearances.
The radial clearances of Type AXN and ARN is special
clearance, as specified in applicable Dimensions Table.

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
Bearing type Shaft Housing
Series NKX, NKXR k5 K6 (M6)
Series NKIA, NKIB k5 M6
Series AXN, ARN j5 J6
Remarks: The parenthesized housing code is applied,
where high rigidity is required.

B-142