NTN - Plummer Blocks

mcloutiermas

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

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