Bearings 177
dharm
d:\N-Design\Des12-1.pm5
20
20
85
35
30
f 25 15
R25
OIL HOLE, DIA 1.5 CSK AT 90°
TO DIA 3
R25 f 25
(^852015)
30
f 15
35
OIL HOLE, DIA 1.5 CSK
AT 90° TO DIA 3
f 15
Fig. 12.2 Solid journal bearing
56
35
2 HOLES,
12×8
6 40
16
20
15
12
12
R25
R16
20
50 R25 f 25
f 32
(^168016)
3 8
15
35
12
8
20
5040
OIL HOLE, DIA 3.5
CSK AT 45° TO DIA 5
OIL HOLE, DIA 3.5
CSK AT 45° TO DIA 5
f
25
33
Fig. 12.3 Bushed journal bearing
12.2.1.3 Pedastal Bearing (Plummer Block)
This bearing is used for long shafts, requiring intermediate support, especially when the shaft
cannot be introduced in the bearing end-wise. It consists of a pedastal or base, a cap and a
bush, split into two halves, called ‘bearing brasses’. The split parts used in the assembly, facilitate
easy assembly and periodical replacement of the worn-out brasses.
After placing the journal on the lower half of the bush, kept in the base, the upper half
of the bush is placed and the cap is then fixed to the pedastal, by means of two bolts (Fig. 12.4).
Flanges are provided at either end of the bush, to prevent its axial motion. The rotary motion
of the bush is prevented by a snug provided at the bottom of the lower brass, fitting into a
corresponding hole in the base.
