NTN - Plummer Blocks

Handling the Plummer Blocks and Bearings
9.3.1 Bearing with an adapter
(1) Thinly apply highly viscous mineral oil to the taper,
threading and the chamfered face of the nut (see
Fig. 9.10) before press-fitting. In particular, apply
molybdenum bisulfide paste to these areas on a
large bearing. This prevents scuffing, and allows
easy bearing removal. Before the installation work,
remove oil from the shaft and the bore face of
sleeve with a clean factory cloth.
the slit with a flat-blade screwdriver for easy fitting.
FIg. 9.11
Fig. 9.11
Fig. 9.10
(2) Mount the adapter to a correct position considering
the dimension B1, B2 or B3 in the bearing table.
When fitting the adapter sleeve onto the shaft, open
(3) Fit the bearing over the adapter sleeve on the shaft
as tight as possible, so that the bearing inner ring is
fully seated onto the taper on adapter sleeve.
(4) Lightly tighten the nut until the sleeve is seated on
the shaft.
(5) When fully tightening a self-aligning ball bearing,
make sure that its radial clearance becomes
approximately 1/2 that before fitting. For a selfaligning
roller bearing, tighten the nut while
measuring its radial clearance with a thickness gage
so that the reduction of radial internal clearance
value in Table 9.1 is reached. Make sure that an
installed self-aligning ball bearing can turn smoothly
by hand (ss Figs. 9.12 and 9.13).
Table 9.1 Installation of tapered bore self-aligning roller bearings
Nominal bearing
bore diameter
d
over incl.
30
40
50
65
80
100
120
140
160
180
200
225
250
280
315
355
400
450
500
560
630
40
50
65
80
100
120
140
160
180
200
225
250
280
315
355
400
450
500
560
630
710
Reduction of radial
internal clearance
Axial displacement drive up
Minimum allowable
residual clearance
Taper 1/12 Taper 1/30
min max min max min max CN C3 C4
0.02
0.025
0.03
0.04
0.045
0.05
0.065
0.075
0.08
0.09
0.1
0.11
0.12
0.13
0.15
0.17
0.2
0.21
0.24
0.26
0.3
0.025
0.03
0.035
0.045
0.055
0.06
0.075
0.9
0.1
0.11
0.12
0.13
0.15
0.16
0.18
0.21
0.24
0.26
0.3
0.33
0.37
0.35
0.4
0.45
0.6
0.7
0.75
1.1
1.2
1.3
1.4
1.6
1.7
1.9
2
2.4
2.6
3.1
3.3
3.7
4
4.6
0.4
0.45
0.6
0.7
0.8
0.9
1.2
1.4
1.6
1.7
1.9
2
2.4
2.5
2.8
3.3
3.7
4
4.6
5.1
5.7
1.75
1.9
2.75
3
3.25
3.5
4
4.25
4.75
5
6
6.5
7.75
8.25
9.25
10
11.5
2.25
2.25
3
3.75
4
4.25
4.75
5
6
6.25
7
8.25
9.25
10
11.5
12.5
14.5
0.015
0.02
0.025
0.025
0.035
0.05
0.055
0.055
0.06
0.07
0.08
0.09
0.1
0.11
0.12
0.13
0.13
0.16
0.17
0.2
0.21
0.025
0.03
0.035
0.04
0.05
0.065
0.08
0.09
0.1
0.1
0.12
0.13
0.14
0.15
0.17
0.19
0.2
0.23
0.25
0.29
0.31
Unit: mm
0.04
0.05
0.055
0.07
0.08
0.1
0.11
0.13
0.15
0.16
0.18
0.2
0.22
0.24
0.26
0.29
0.31
0.35
0.36
0.41
0.45
26