Справочник Пользователя для GE Verticle Induction Motor GEK-95352
GEK-95352
18
is obtained. The nut should then be
locked with its lockwasher. If
equipment is not available to use
this method, the following proce-
dure may be used. Tighten the mo-
tor shaft nut carefully until all end-
play is removed and the rotor just
fails to turn freely. Then back the
nut off 1/6 turn and lock with its
washer. An assembly nameplate
giving this information is mounted
on the motor.
locked with its lockwasher. If
equipment is not available to use
this method, the following proce-
dure may be used. Tighten the mo-
tor shaft nut carefully until all end-
play is removed and the rotor just
fails to turn freely. Then back the
nut off 1/6 turn and lock with its
washer. An assembly nameplate
giving this information is mounted
on the motor.
Motors which must withstand con-
tinuous up-thrust have a somewhat
different construction. The upper
(thrust) bearing is arranged to take
this up-thrust; it consists of angular-
contact thrust bearing mounted
back-to-back (DB). (See Figure 3.)
The inner rings are locked on the
lower half-coupling with a nut and
the outer rings are clamped in the
endshield with a ring. The shaft
shoulder below the lower half-
coupling is so located that it seats
against the lower half-coupling be-
fore the lower bearing comes up
against its cover. No special adjust-
ment is necessary when reassem-
bling this type of motor, and the
motor shaft nut can be pulled down
tight and locked. The end-play of
motors using DB-mounted bearings
will then be very small, 0.005” or
less.
tinuous up-thrust have a somewhat
different construction. The upper
(thrust) bearing is arranged to take
this up-thrust; it consists of angular-
contact thrust bearing mounted
back-to-back (DB). (See Figure 3.)
The inner rings are locked on the
lower half-coupling with a nut and
the outer rings are clamped in the
endshield with a ring. The shaft
shoulder below the lower half-
coupling is so located that it seats
against the lower half-coupling be-
fore the lower bearing comes up
against its cover. No special adjust-
ment is necessary when reassem-
bling this type of motor, and the
motor shaft nut can be pulled down
tight and locked. The end-play of
motors using DB-mounted bearings
will then be very small, 0.005” or
less.
3.
End-Play Adjustment
Roller-Thrust Bearing
Roller-Thrust Bearing
Springs are used under spherical-
roller thrust bearing to keep them
axially loaded during momentary
up-thrust periods. See Figure 2. This
puts an up-thrust load on the lower
guide bearing. The springs (and
spacers if a full circle of spring is
roller thrust bearing to keep them
axially loaded during momentary
up-thrust periods. See Figure 2. This
puts an up-thrust load on the lower
guide bearing. The springs (and
spacers if a full circle of spring is
not used) are located in a “chair”
which is in turn located in the upper
endshield. This ”chair” and the cap-
tive springs can be removed and
cleaned as a unit if necessary; it
should not be taken apart unless it or
a spring is damaged.
which is in turn located in the upper
endshield. This ”chair” and the cap-
tive springs can be removed and
cleaned as a unit if necessary; it
should not be taken apart unless it or
a spring is damaged.
End-play is provided in the motor so
that the application of down-thrust
during normal operation will cause
the thrust bearing to move down and
seat in its housing and relieve the
up-thrust load on the lower bearing.
Thus, to avoid premature failure of
the lower bearing, the minimum to-
tal external down-thrust that is ap-
plied continuously to the motor
during operation should always be
greater than the spring-load listed on
the individual outline provided with
the motor. This value may range
from 3000 pounds to 6000 pounds,
depending on the size of the bear-
ing.
that the application of down-thrust
during normal operation will cause
the thrust bearing to move down and
seat in its housing and relieve the
up-thrust load on the lower bearing.
Thus, to avoid premature failure of
the lower bearing, the minimum to-
tal external down-thrust that is ap-
plied continuously to the motor
during operation should always be
greater than the spring-load listed on
the individual outline provided with
the motor. This value may range
from 3000 pounds to 6000 pounds,
depending on the size of the bear-
ing.
Adjust the end-play by adjusting the
motor shaft nut. Tighten the nut un-
til the lower bearing comes up
against its cover and the springs are
being compressed, as indicated by
downward movement of the lower
half-coupling. Check the end-play
by placing a dial indicator between
the end-shield cover and the lower
half-coupling and pressing down on
the latter with a jack (sec Figure 2)
until the bearing seats in its housing.
Repeat this process of tightening the
nut and checking the end-play until
0.015 to 0.020” end-play is ob-
tained; then lock the nut with the
setscrew.
motor shaft nut. Tighten the nut un-
til the lower bearing comes up
against its cover and the springs are
being compressed, as indicated by
downward movement of the lower
half-coupling. Check the end-play
by placing a dial indicator between
the end-shield cover and the lower
half-coupling and pressing down on
the latter with a jack (sec Figure 2)
until the bearing seats in its housing.
Repeat this process of tightening the
nut and checking the end-play until
0.015 to 0.020” end-play is ob-
tained; then lock the nut with the
setscrew.
There are six holes in the nut and
five holes in the lower half-
coupling, making a total of 30
“locking positions” where two holes
five holes in the lower half-
coupling, making a total of 30
“locking positions” where two holes