Pulsafeeder Pulsalube 8 GS Ultra, Operation & Maintenance Manual

Page: 153 / 198

DRIVESYSTEMS
CLINCHER
™
SHAFT-MOUNT
WITH RUBBER BUFFERS
RETAIN FOR FUTURE USE
U10580 - 1 of 2
1. Purpose of the built-in torque arm lug
The preferred method of installing a shaft-mounted Clinch-
er™ reducer is to support the weight of the gear unit or
gearmotor assembly from the driven solid machine shaft.
In order to restrain the gearbox, react the torque, and keep
the gear unit from spinning around the shaft, the Clincher™
gear units have a built-in torque arm lug or tab cast into the
reducer housing. This torque tab is intended to be used in
conjunction with the NORD Rubber Buffers.
Figure 1: Built-in torque lug
2. Rubber buffers
When specifi ed, NORD provides two rubber buffers that are
installed on either side of the gear unit’s integral torque lug.
When properly used in tandem, on either side of the torque-
arm lug, the rubber buffers help isolate and absorb 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 torque of the reducer, keeping 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.
For further dampening it is possible to combine several
rubber buffers in a row, on either side of the torque lug.
IMPORTANT NOTE
Please reference Table 1 on page 2 of this manual for
dimensional information.
STOP
HARMFUL SITUATION
STOP
Always mount at least one rubber buffer on either side
of the reducer’s torque-arm lug. When using rubber
buffers in tandem, make sure equal numbers are used
on both sides of the torque tab. 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
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.
A single customer-supplied machine support bracket, of ad-
equate strength and rigidity, can provide adequate restraint
for both directions. This is because when the rubber buffer
system is used, the applied load forces are always parallel to
the retaining bolt and there are no twisting forces induced
onto the bolt in either the clockwise or counter-clockwise
direction. In some cases the customer may desire to supply
a rigid support on either side of the rubber buffers. In these
instances, longer assembly hardware is required.
4. Installation of the rubber buffers
A. Install the Clincher™ hollow bore reducer onto the
machine shaft. Line up the hole in the reducer’s torque-arm
lug with the hole in the machine’s support bracket and
temporarily hold the reducer in place.
B. Properly secure the gear unit assembly to the driven shaft
in an axial direction. If using the NORD Shaft Fixing Kit,
follow the instructions in User Manual U10280.
C. Install the rubber buffers on either side of the gear unit’s
torque-arm lug. Apply a thread locking compound to the
end of the fi xing bolt. Then place the fi xing bolt through
the rubber buffers, torque-arm lug and rigid machine
support bracket and loosely secure the nut onto the end
of the bolt.
D. Tighten the fi xing bolt and nut until lightly snug until all
of the free play is eliminated from the rubber buffer
assembly. Then snug the fi xing bolt assembly by tightening
an additional 1/4 to 1/2 turn.
WARNING
To help prevent damage to the rubber buffers, avoid
over-tightening.
IMPORTANT NOTE
• A min. of (2) rubber buffers are required for each unit.
• For larger size CLINCHER’S
™
, NORD offers the heavy-duty
rubber buffer (Option VG).
• A metric fi xing bolt is preferred for rubber buffer
assembly. NORD recommends a minimum ISO Grade
8.8
fi xing bolt.
www.nord.com/docs 05.30.12
NORD Gear Corporation
Toll Free in the United States: 888.314.6673
NORD Gear Limited
Toll Free in Canada: 800.668.4378