Pulsafeeder Pulsalube 8 GS Ultra, Руководство по эксплуатации и техническому обслуживанию

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90.1 HELICAL-BEVEL SHAFT-MOUNT
WITH BOTTOM MOUNT TORQUE ARM (K)
RETAIN FOR FUTURE USE
U10620 - 1 of 2
1. Torque arm (K)
The preferred method of installing a shaft-mounted reducer
is to support the weight of the gear unit or gearmotor as-
sembly from the driven solid machine shaft. A torque arm is
required in order to restrain the gearbox, react to the load
torque, and keep the gear unit from spinning around the
shaft.
Table 1 (Page 2) provides a list of Torque-Arm (K) part num-
bers available for the 90.1 Series Helical-Bevel gear units. The
Torque Arm (K) is secured to the base of the reducer. On most
sizes there is an integral resilient rubber bushing located at
the fastening hole-end of the torque arm. On the larger sizes,
rubber buffers are used in conjunction with the torque arm
and when properly used they are applied in tandem, on ei-
ther side of the torque arm lug.
IMPORTANT NOTE
When ordering the Torque Arm (K) one can specify
which side of the reducer to mount the fastening hole
that bolts to the machine support bracket. Consult the
appropriate NORD catalog for specific Torque Arm (K)
mounting options and ordering guidelines.
2. Purpose of the rubber bushing or rubber buffers
Regardless if the Torque Arm (K) is supplied with the inte-
gral rubber bushing or whether separate rubber buffers are
required, the bushing/buffers help isolate and absorb all the
load forces present in the system and increase the reducer’s
service life by reducing cumulative torsional shock loads.
• The primary load force acts in the direction of driven shaft
rotation, reacts the load torque of the reducer, and
prevents the gearbox from spinning on the shaft.
• Additional forces present themselves in the direction
opposite of the shaft rotation, due to the typical slight
out-of-round condition present in the machine shaft. This
condition is the reason most shaft mounted-reducers have
a slight shaft-wobble, which is normal.
STOP
HARMFUL SITUATION
STOP
Always make sure that the Torque Arm (K) is used in
conjunction with the required rubber bushing/s. Failure
to do so will not properly cushion the reducer and can
result in excessive binding, bearing stress, and damage
to the reducer.
3. Machine support
The user must supply a suitably strong and rigid mating ma-
chine support that provides load bearing capacity on both
sides of the machine support bracket.
WARNING
It is the responsibility of the machine builder to design a
support bracket of adequate strength and rigidity, and
supply an appropriate tightening bolt assembly. Failure
to do so may result in injury caused from a damaged or
broken torque-reaction assembly.
4. Installation of the right-angle reducer
with torque arm (K)
A. Make sure the Torque-Arm (K) is mounted so that the
machine fastening hole is on the correct side of the reducer.
• The torque-arm can be repositioned on the as-received
unit by removing the fixing screws, re-position the
torque-arm in the correct location, and re-securing the
fixing screws to the proper tightening torque, as
indicated in Table 2 (Page 2).
• If the torque-arm was shipped loose, position the torque-
arm in the correct location on the gear unit, and secure
the torque-arm with the proper fixing screws & tighten-
ing torque, as indicated in Table 2 (Page 2).
B. Install the right-angle hollow bore reducer onto the
machine shaft. Line up the hole in the reducer’s torque-
arm with the hole in the machine’s support bracket ,and
temporarily hold the reducer in place
C. Properly secure the gear unit assembly to the driven shaft
in an axial direction.
D. Apply thread locking compound to the end of the fixing
bolt, then place the fastening bolt through the rigid
machine support bracket and reducer torque-arm and
loosely secure the nut onto the end of the bolt.
E. If the torque arm has an integral rubber bushing
follow step F and skip steps G-H. If the torque arm uses
rubber buffers skip forward to steps G-H.
F. Tighten the fixing bolt to the proper tightening torque as
indicated in Table 2 (Page 2).
G. Install the rubber buffers on either side of the gear unit’s
torque-arm lug and place the fixing bolt through the
rubber buffers and torque-arm lug and into the rigid
machine support bracket.
H. Tighten the fixing bolt and nut lightly snug, until all the
free-play is eliminated from the rubber buffer assembly.
Then snug the fixing bolt assembly by tightening an
additional ¼ to ½ turn.
WARNING
To prevent damage to the rubber buffers, avoid over-
tightening.
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NORD Gear Corporation
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NORD Gear Limited
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