Brochure

6
Bearings
Bearings
Vertical
There is a standard arrangement for
the bearings conguration: thrust and
guide bearing at NDE side and only
guide bearing at DE side.
NDE thrust bearing is assembled into
a housing, which is bolted at the upper
endshield, and the upper endshield is
bolted against the stator frame.
NDE guide bearing works in contact
with a thrust block, which is the piece
that connects the rotor shaft to the
thrust bearing surface, by means of a
key connection in the shaft.
High-pressure oil lift systems are
frequently supplied at NDE thrust
bearing to allow easy start-up (due to
the high pressure at the thrust bearing
surface) and also better installation
and maintenance handlings.
NDE thrust bearing is insulated
from the thrust bearing housing. A
removable link is provided to ground
the drive end guide bearing and to
facilitate testing of the thrust bearing
insulation.
DE guide bearing is assembled at
the lower endshield, together with its
support, and it works in contact with a
track built in the rotor shaft.
Lower endshield is bolted against the
stator frame, and it is positioned at the
inner side of the stator frame.
All the components assembled at the
lower endshield (DE guide bearing,
supports and covers) are split, in order
to permit the assembling process (due
to rotor shaft ange diameter, usually
larger than DE guide bearing inner
diameter). The access to those pieces
is done by means of openings in the
lower endshield, which is closed after
the assembly process is nished.
Horizontal
There are normally two sleeve
bearings, each mounted on a pedestal
that is bolted to the base. Each
bearing liner is made from steel, lined
with white metal and is split on the
horizontal centerline. The standard
two-bearing arrangement (which
can be varied, by agreement, to suit
the type of coupling used) assumes
a limited end-oat coupling, and
non-locating bearings are provided.
(Typical end-oat is ± ½ inches).
Thrust bearing can be provided on
the DE or NDE side, according to
requirements.
Oil throwers on the shaft and
oil seals on the pedestal are
provided to prevent oil leakage and
contamination. High-pressure oil
lift systems are frequently supplied
at each bearing to allow for easy
installation and maintenance.
NDE bearing liner is insulated from
the bearing housing. A removable link
is provided to ground the drive end
bearing and to facilitate testing of the
bearing insulation.