Page 236 - Rollingbearings

Conclusion Fig. 2
Radial shaft seal, design HMS5
Non-locating support
The NU 311 ECP bearing, currently used in the centrifugal pump, is
adequate. As an alternative, the NU 311 ECM bearing could be used.
Downsizing of the bearing is possible.
Bearing execution is described by sufixes in the bearing designa-
tion (Designation system, page 514)

Designation sufixes:

Sufix Description

Internal design EC optimized internal design incorporating more
and/or larger rollers and with a modiied
roller end / lange contact designed to mini-
mize friction
Cage design P glass ibre reinforced PA66 cage, roller
centred

M machined brass cage, riveted, roller centred
Clearance class – Normal

Locating support
The pair of universally matchable 7312 BECBP bearings, currently
used in the centrifugal pump, are adequate. As an alternative, the Fig. 3
7312 BECBM bearing could be used. Radial shaft seal, design HMSA10
Bearing execution is described by sufixes in the bearing designa-
tion (Designation system, page 404)

Designation sufixes:

Sufix Description

Internal design B 40° contact angle
E optimized internal design – reinforced
rolling element set
External design / CB bearing for universal matching; two
clearance class bearings arranged back-to-back or
face-to-face; have Normal axial internal
clearance
Cage design P glass ibre reinforced PA66 cage, ball
centred
M machined brass cage, ball centred

C.3 Centrifugal pump

234