RINGFEDER TNM H User manual

EN
08.2019
Elastomer Jaw Couplings
RINGFEDER® TNM H
Installation and Operation Manual
Partner for Performance www.ringfeder.com

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Content
Chapter Page
1Notes on safety.................................................................................................................2
2Function............................................................................................................................ 3
2.1 Appropriate Use.........................................................................................................3
3Marking of the coupling..................................................................................................... 3
4Storage ............................................................................................................................. 4
5Construction ..................................................................................................................... 5
6Technical data .................................................................................................................. 6
7Assembly .......................................................................................................................... 7
7.1 Pay attention before the assembly ............................................................................7
7.2 Finished borehole......................................................................................................8
7.3 Installing coupling ......................................................................................................9
8Adjusting coupling .......................................................................................................... 11
8.1 Angular misalignment ∆Kw.......................................................................................12
8.2 Radial displacement ∆Kr..........................................................................................12
8.3 Axial displacement...................................................................................................13
9Operation........................................................................................................................ 14
9.1 Sense of rotation test...............................................................................................17
10 Maintenance .................................................................................................................. 19
10.1 Wear Inspection on the Buffer Ring.........................................................................19
10.2 Wear limit of elastic buffers......................................................................................20
10.3 Changing the elastic intermediate ring .................................................................... 20
11 Waste Disposal ..............................................................................................................21
1 Notes on safety
The present assembly and operating instruction (AOI) constituents a part of the coupling
supply. Always keep the AOI near the coupling well accessible.
The German version of this manual is the predominant and binding version.
Make sure that all persons charged with the assembly, operating, service, and maintenance
have read and understood the AOI and follow all the points:
-Avert hazards for body and live of the user and third parties.
-Ensure the operating safety of the coupling.
-Avoid the loss of use and environmental impairment through false handling.
In the case of transport, mounting, dismounting and maintenance, attention is to be paid to
the relevant regulations for industrial safety and for environmental care.
The coupling may only be operated, mounted, serviced and maintained by authorised and
trained personnel.
The user must take into account that the bolting elements of coupling parts may be adversely
affected by the heat produced by a brake disk/ brake drum due to the resultant friction. Make
sure that the combination of the employed brake lining with the material of the brake disk/
brake drum does not lead to sparks or impermissible thermal growth. The brake disk is
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normally made of steel, and the brake disk is normally made of cast iron with nodular graph-
ite. In case of any doubt, please consult the supplier!
In the interest of further development, we reserve the right to make changes which serve
technological progress.
By the use of accessories and spare parts, which were not originally manufactured by
RINGFEDER POWER TRANSMISSION, we are not responsible for any resulting damage
or liability or guarantee.
2 Function
The coupling RINGFEDER® TNM H is a torsionally elastic and puncture-proof claw coupling
with a removable intermediate piece, mainly for the drives of pumps.
It levels out angular, radial and axial shaft misalignments within defined ranges. The coupling
transfers the torque via pressure loadable, elastic buffers of Perbunan (Pb) which are joined
together as an intermediate ring.
The elastic intermediate ring can cushion impacts and torsional vibrations; it is oil-tight and
electrically conductive.
Both coupling halves are divided in two, which enables a radial installation and de-installation
of the reduction sleeve. The de-installation measurement between the flange hubs allows the
changing of the elastic intermediate ring or the dismounting of the bearing block of a centrifu-
gal pump without moving the motor. The coupling is usable in every sense of rotation and
installation position.
2.1 Appropriate Use
•In order to ensure a faultless, lasting operation of the coupling, it must be laid out
accord-ing to the instructions e.g. DIN 740 part 2 (or also Product Paper & Tech Paper
”Elastomer Jaw Couplings“) with an operating factor corresponding to its operating
conditions.
•The coupling must only be operated in normal industrial atmospheres. Since aggressive
media may attack the coupling components, screws and elastic buffer rings, they repre-
sent a risk for the operational safety of the coupling. Consult RINGFEDER POWER
TRANSMISSION in such cases.
•Apart from incorporating a finished borehole with parallel key slot (see “7.2 Finished
borehole”) no further changes can be carried out on the coupling.
•The coupling may only be used within the framework of the conditions defined in the
performance and delivery contract.
•Every change of the conditions of use or the operating parameters necessitates a new
verification of the coupling layout.
3 Marking of the coupling
The product line RINGFEDER® TNM H has its hardness in Shore (A) indicated on the
elastic intermediate ring.
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4 Storage
On receipt of the goods, the supply is to be checked immediately for completeness and
correctness. Possible damages incurred during transit and / or missing parts are to be
notified in writing.
The coupling parts can be stored in their delivered standard-state for 6 months in a dry,
roofed place at normal room temperature. For a longer storage duration a long-term preser-
vation is necessary (consult RINGFEDER POWER TRANSMISSION). The elastic
intermediate ring must not be subjected to ozone containing mediums, direct solar influence
or strong light sources with ultraviolet-light. The relative humidity must not exceed 65%. In
the case of proper storage the characteristics of the elastic intermediate ring remain
unchanged for almost up to three years.
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Fig. 1 Construction RINGFEDER® TNM H
5 Construction
Reference:
Flange hubs (Pos. 3) and removable intermediate piece (Pos. 4) are always delivered
screwed together.
Balanced parts are position marked to each other.
1 Pan-head screw DIN 912
2 Locking washer (caging-washer)
3 Flange hub part 105
4 Removable intermediate piece part 112-118
5 Elastic intermediate ring part 010
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6 Technical data
Table 1 Technical data:
Size
TNM
H
TCnom
Pb72
[Nm]
TCpeak
Pb72
[Nm]
TCnom
Pb82
[Nm]
TCpeak
Pb82
[Nm]
nmax
[min-1]
d1
max
[mm]
d3
[mm]
d5
[mm]
L
[mm]
z x M x Ls SH
[mm]
67 22 45 35 75 10000 28 45 67 30 4 x M 6 x 20 5
82 48 100 75 160 8000 32 53 82 40 4 x M 8 x 25 5
97 96 200 150 340 7000 42 66 97 50 5 x M 8 x 25 5
112 150 310 230 540 6000 48 79 112 60 6 x M 8 x 25 7
128 250 500 380 860 5000 55 90 128 70 6 x M 8 x 25 7
148 390 800 600 1350 4500 65 107 148 80 7 x M10 x 35 7
168 630 1300 980 2250 4000 75 124 168 90 8 x M10 x 35 7
194 1050 2000 1650 3630 3500 85 140 194 100 9 x M10 x 35 7
214 1500 3100 2400 5400 3000 95 157 214 110 9 x M12 x 40 7
240 2400 4800 3700 8650 2750 110 179 240 120 10 x M12 x 40 8
265 3700 7500 5800 13500 2500 120 198 265 140 10 x M14 x 45 8
295 4900 10000 7550 18000 2250 130 214 295 150 10 x M14 x 50 10
330 6400 13000 9900 23400 2000 150 248 330 160 10 x M16 x 55 10
370 8900 18200 14000 32750 1750 170 278 370 180 11 x M16 x 55 10
415 13200 27000 20500 49000 1500 190 315 415 200 12 x M16 x 55 10
Size
TNM H
S3=100mm
m [kg]
S3=120mm
m [kg]
S3=140mm
m [kg]
S3=180mm
m [kg]
S3=250mm
m [kg]
S3=300mm
m [kg]
67 2,5 2,8 3,1
82 4,0 4,4 4,9
97 6,4 7,0 7,7
112 9,5 10,3 11,1
128 13,2 14,1 15,1 17,0
148 19,4 20,6 21,8 24,3
168 27,5 28,9 30,3 33,2
194 37,7 37,0 44,6 50,7
214 50,5 50,2 58,9 66,2
240 70,5 74,1 78,8 86,6
265 97,0 89,2 105,0 115,4
295 131,1 137,8 147,8
330 182,2 191,0 205,8
370 240,2 250,9 291,4
415 306,1 314,1 319,5
Fig. 2 RINGFEDER® TNM H
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The torque TCnom and TCpeak is valid for:
-Intermediate rings of Perbunan Pb72 and/or Pb82,
-Ambient temperatures of -40 °C to +60 °C,
-Operation within the stipulated alignment values.
Weights are specified for couplings without bores in the hubs.
During the layout of the coupling according to DIN 740 part 2 (or also Product
Paper & Tech Paper ”Elastomer Jaw Couplings“) different factors must be
considered:
-with higher temperatures a corresponding temperature factor Sυ
-according to the starting frequency a starting factor Sz
-in dependence of the operating conditions an impact factor, SA, SL
With circumferential speeds of more than 22 m/s, we recommend to balance the coupling.
7 Assembly
7.1 Pay attention before the assembly
• Danger of injuries!
• Disconnect the drive before carrying out any work on the cou-
pling!
• Secure the drive against unintentional re-start and rotation!
• Incorrectly tightened bolts can cause serious personal inju
ries and
property damages!
• In compliance with accident prevention regulations, you are
obliged to protect all freely rotating parts by means of permanently
installed guards/ covers against unintentional contact and falling
down objects.
• To avoid sparks, the covers for couplings used in explosive
atmospheres should be made of stainless steel!
• As a minimum, the covers have to fulfil the requirements of
protection type IP2X.
• The covers have to be designed to prevent dust from depos
iting
on the coupling.
• The cover must not contact the coupling or impair the proper
function of the coupling.
•Make sure that the speeds, torques and ambient temperatures as stated in chapter 6
‘Technical Data’ are not exceeded.
•The maximum permissible bore diameters must not be exceeded.
•Check whether the shaft-hub connections safely transmit the occurring operating torques.
•The standard tolerance of RINGFEDER® TNM for finish bores is fit H7.
•Standard keyways comply with DIN 6885, sheet 1.
•Check the dimensions and tolerances of shafts, hub bores, keys and keyways.
•Set screws as required.
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7.2 Finished borehole
For the completion of a finished borehole in a flange hub pay attention to following procedure:
• Clean the coupling hub of preservatives.
• Tighten the flange hub to the faces labelled with 

and carefully align the flange hub.
• The indicated values in table 1 for ød1max are valid for a parallel key connection according
to DIN 6885/1 and must not be exceeded.
• Choose the borehole fit so that during the union with the shaft a tolerance wringing fit
and/or interference fit as for example with H7/m6 is made.
• Provide an axial securing of the hub, where appropriate with a setscrew on the hub back
above the parallel key slot.
In the case of other shaft hub connections consultation with RINGFEDER POWER
TRANSMISSION is necessary.
• The maximum indicated bore diameters are valid for a parallel key
connection according to DIN 6885/1 and must not be exceeded.
• In the case of transgression of these values the coupling can
sever.
• Due to flying away fragments danger exists!
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Fig. 4
Fig. 3
7.3 Installing coupling
• Take out the elastic intermediate ring
(Figure 3, Pos. 1).
• Clean the boreholes of the flange
hubs and the shaft ends before in-
stalling. The surfaces must be clean,
dry and grease-free.
• Use suitable installation aids and
hoists such as cranes or pulley
blocks in the case of bigger cou-
plings.
• Pull the flange hubs with the reduc-
tion sleeve onto the shaft ends to its
provided position (Figure 3, Pos. 2).
Reference:
For easier installation a uniform warming of the hub from 80 °C to 120 °C is safe.
 Warning!
 Only work with gloves as a protection against hot parts of the
coupling!
• Mount the hubs so that the shaft
ends are flush with the interior
borehole openings (Figure 4).
Overlapping shaft ends prevent the
radial installation and de-
installation of the reduction sleeve.
Pay attention to possible differing
agreements!
• Secure possible available set-
screws when tightening with an
adhesive e.g. Loctite 222 against
automatic loosening and flying out.
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Fig. 5
ATTENTION!
Let the hot hubs cool off to ambient temperature before the introduction of the inter-
mediate ring.
• For easier mounting the elastic
intermediate ring can be provided
with a slip additive (e.g. Talcum)
before introduction).
• Fit the intermediate ring into one
half of the coupling
• Push together the shaft ends with
the mounted half of the clutch (Fig-
ure 5).
• Adjust the coupling according to the
following specifications in “8 Cou-
pling adjustment".
Reference:
If the shaft distance is already adjusted to the de-installation measurement of the
reduction sleeve:
• Firstly disassemble the reduction sleeve from the flange hubs.
• Pull the flange hubs separately onto the shaft ends.
• If setscrews are available, secure these against automatic loosening and flying out
with an adhesive e.g. Loctite 222.
Attention!
The bearing surfaces of the reduction sleeves and flange hubs must be clean, dry and
grease-free. Balanced parts are position marked to each other.
• Position the transition pieces in their
respective marked position. Pay at-
tention that, the parts do not tilt dur-
ing the joining on the centering seat.
• Tighten the screws slightly and
uniformly.
• Tighten up the bush screw fitting with
the tightening torque MA as stipulated
in table 2 (Figure 6).
• Adjust the coupling according to the
following specifications in “8 Coupling
adjustment".
Table 2 Tightening torques MAof the bush screw fitting:
Size 67 82 97 112 128 148 168 194 214 240 265 295 330 370 415
DIN 912- 8.8 M6 M8 M8 M8 M10 M10 M10 M10
DIN 912-10.9 M12 M12 M14 M14 M16 M16 M16
MA [Nm] 10 25 25 25 25 49 49 49 125 125 200 200 310 310 310
Fig. 6
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8 Adjusting coupling
 Injury hazard!
 Switch-off the drive before all work on the coupling!
 Secure the drive against unintentional switching on and rotating!
 Reference:
 An exact alignment of the coupling increases the service life of the
elastic intermediate ring and lessens hazards by use.
 Do not exceed the maximum permissible displacement values. An
overstepping of these values results in coupling damage and
breakdown!
• When aligning the cold equipment take into account the expected thermal growth of the
components, so that the permissible misalignment values for the coupling are not
exceeded in operation.
• Be aware that the coupling under misalignment imposes restoring forces on the adjacent
shafts and bearings. Take into account that the larger the misalignment, the greater the
restoring forces will be.
• The displacement values indicated in the tables 3 to 5 are maximum permissible guide
numbers.
We recommend not to fully utilise these values during the alignment, so that in operation
sufficient reserves remain for thermal expansions, foundation settlements etc.
• In special cases with high demands on quiet running or high rotating speeds it is possible
that, in the three displacement levels, an alignment accuracy of ≤ 0,1 mm is necessary.
• If the coupling is mounted in a closed housing / casing so that a subsequent alignment is
not possible any more, it must be guaranteed that the geometry and fit accuracy of the
contact surfaces in operation aligns the shafts exactly within the mentioned tolerances.
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8.1 Angular misalignment ∆
∆
∆
∆Kw
• Measure on the face of the external
diameter a complete rotation (360°).
Determine in this case the greatest
deviation ∆Kw1 as well as the small-
est deviation ∆Kw2 (Figure 7).
• Calculate the angular misalignment
∆Kw = ∆Kw1 - ∆Kw2.
• The values in table 3 are valid for a
reference rotation speed of
1500 min-1.
Table 3 Maximum permissible displacement values - angular:
Size 67 82 97 112 128 148 168 194 214 240 265 295 330 370 415
∆Kw max [mm] 0,2 0,2 0,2 0,3 0,3 0,3 0,3 0,3 0,3 0,3 0,3 0,3 0,3 0,3 0,3
8.2 Radial displacement ∆
∆∆
∆Kr
• Measure a complete rotation
(360°). Determine in this case the
greatest deviation ∆Kr1 as well as
the smallest deviation ∆Kr1 Kr2 (Fig-
ure 8).
• Calculate the radial displacement
∆Kr = 0,5 x (∆Kr1 - ∆Kr2). Pay atten-
tion to the operational sign of the
measured values.
• The values in table 4 are valid for a
reference rotation speed of
1500 min-1.
Table 4 Maximum permissible displacement values - radial:
Size 67 82 97 112 128 148 168 194 214 240 265 295 330 370 415
∆Kr max [mm] 0,2 0,2 0,2 0,3 0,3 0,3 0,3 0,3 0,3 0,3 0,3 0,3 0,3 0,3 0,3
Fig. 7
Fig. 8
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8.3 Axial displacement
•Measure, according to Figure 9 the
axial gap measurement SH.
• Keep to the maximum permissible
tolerance X according to table 5,
when aligning the gap measure-
ment SH.
ATTENTION!
If the installation dimension re-
mains under SH, the intermediate
pieces can not be lifted out!
If during operation greater axial
displacements are expected, then
consultation with RINGFEDER
POWER TRANSMISSION is
necessary.
Table 5 Recommended alignment values - axial:
Size 67 82 97 112 128 148 168 194 214 240 265 295 330 370 415
SH [mm] 5 5 5 7 7 7 7 7 7 8 8 8 10 10 10
X [mm] +0,5 +1,0 +1,0 +1,0 +1,0 +1,0 +1,5 +1,5 +1,5 +1,5 +2,5 +2,5 +2,5 +2,5 +2,5
Fig. 9
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
Injury hazard!
9 Operation
When using the coupling, attention is to be paid to its rating (see “6 Technical data").
This cannot in no case be exceeded without written permission from RINGFEDER
POWER TRANSMISSION. In order to ensure a faultless, lasting operation of the coupling,
it must be laid out according to the instructions e.g. DIN 740 part 2 (or also Product Paper
& Tech Paper ”Elastomer Jaw Couplings“) with an operating factor corresponding to its
operating conditions. Every change of the conditions of use or the operating parameters
makes an inspection of the coupling layout urgently necessary.
 Switch-off the drive before all work on the coupling!
 Secure the drive against unintentional switching on and rotating!
 Due to incorrectly tightened screws parts can fly away and cause
serious injuries to persons and material damage!
 Check before commissioning the coupling its alignment and all
screw fixings for their specified tightening torque and/or firm seat-
ing!
 Before commissioning the plant all protective devices against
unintentional touching of free moving and/or rotating parts must be
installed.
 To avoid sparks coverings in stainless steel should be used!
 The coverings must fulfil at least the demands of protection type
IP2X.
 The covering is to be so designed that it does not deposit dust onto
the coupling parts.
 The coverings must not touch the coupling or influence it in its
functioning.
Pay attention during the operation of the coupling to:
 Changed running noises
 Occurring vibrations
Attention!
• If irregularities are found during the operation of the coupling, the drive must be
immediately switched off.
• Detect according to the following table 6 “Operating faults and their possible causes" the
fault cause and remove them
The listed faults are some examples which are supposed to facilitate fault location.
• For fault finding and elimination, all machine components and operating states are
to be considered!
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Table 6 Operating faults and their possible causes:
Trouble Cause Risk Warning Correction
Alignment fault Considerable
increase in cou-
pling temperature.
Premature wear of
elastic buffers.
Increased reaction
forces act on
connected ma-
chines.
-Disconnect drive
-Remove cause for alignment fault
-Re-align coupling
-Inspect elastomer for wear
Elastomer worn
out
Coupling claws
strike against each
other. Spark
formation, claw
fracture, increased
reaction forces.
-Disconnect drive
-Check coupling components for
damages and replace parts, if
necessary
-Replace elastomer
Unbalance Considerable
increase in cou-
pling temperature.
Premature wear of
elastic buffers.
Increased reaction
forces act on
connected ma-
chines
-Disconnect drive
-Verify balance state of plant
components and correct it, if nec-
essary
-Inspect elastomer for wear
Irregular
running
noises/
vibrations
Loose screw
connections
Flying off parts can
cause serious
injuries and
considerable
damages.
-Disconnect drive
-Check coupling parts for damages,
replace parts, if necessary
-Verify alignment of coupling
-Tighten screws to the specified
tightening torque and secure them
against working loose, if necessary,
-Inspect elastomer for wear
Alignment fault Considerable
increase in cou-
pling temperature.
Increased reaction
forces act on
connected ma-
chines.
-Disconnect drive
-
Remove cause for alignment fault
-Re-align coupling
-Inspect elastomer for wear
Premature
wear of
elastomer
Unacceptable
temperatures
Material properties
of elastic buffers
change. The torque
transmission
capability is
adversely affected.
-Disconnect drive
-Replace elastomer
-Re-align coupling
-Adjust ambient temperature
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Trouble Cause Risk Warning Correction
Contact with
aggressive
products
Material properties
of elastic buffers
change. The torque
transmission
capability is
adversely affected.
-Disconnect drive
-Check coupling parts for damages
and replace parts, if necessary
-Replace elastomer
-Verify alignment of coupling
-Prevent contact with aggressive
products
Torsional
vibra
tions in the
drive line
Considerable
increase in cou-
pling temperature.
Premature wear of
elastic buffers.
Increased reaction
forces act on
connected ma-
chines.
-Disconnect drive
-Analyse and eliminate cause for
torsional vibrations
-Check coupling parts for damages
and replace parts, if necessary
-Replace elastomer and consult
RINGFEDER POWER
TRANSMISSION concerning even-
tual use of another Shore-hardness
-Verify coupling alignment
Wear limit
of elas-
tomer
exceeded
===>
contact of
claws
Coupling is
destroyed. Con-
nected machines
can be affected,
too.
-Disconnect drive
-Replace coupling
-Inspect the elastomer for wear at
shorter intervals
Claw
breakage
Overload
due to too
high torque
Coupling is
destroyed. Con-
nected machines
can be affected,
too.
-Disconnect drive
-Verify coupling design in coopera-
tion with RINGFEDER POWER
TRANSMISSION
-Replace coupling
-Install larger coupling, if necessary
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Fig. 10
9.1 Sense of rotation test
 Injury hazard!
 Switch-off the drive before all work on the coupling!
 Secure the drive against unintentional switching on and rotating!
 Due to incorrectly tightened screws parts can fly away and cause
serious injuries to persons and material damage!
 Check before commissioning the coupling its alignment and all
screw fixings for their specified tightening torque and/or firm seat-
ing!
 Before commissioning the plant all protective devices against
unintentional touching of free moving and/or rotating parts must
be installed.
 To avoid sparks coverings should be of stainless steel!
 The coverings must fulfil at least the demands of protection type
IP2X.
 The covering is to be so designed that it does not deposit dust
onto the coupling parts.
 The coverings must not touch the coupling or influence it in its
functioning.
• Remove the holding-down bolts of
the reduction sleeve
• Push together the intermediate
pieces (Part 112-118) of the cen-
tring flange hubs (Part 105) with the
elastic intermediate ring.
• Lift-out the intermediate pieces
together with the elastic intermedi-
ate ring (Figure 10).
Use in the case of bigger couplings
suitable installation aids and hoists
such as cranes or pulley blocks.
• Install after the sense of rotation test
a new intermediate ring.
• For easier mounting, the new inter-
mediate ring can be provided with a
slip additive before introduction (e.g. Talcum).
Attention!
The bearing surfaces of the reduction sleeves and flange hubs must be clean, dry and
grease-free. Balanced parts are position marked to each other.
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• Position the transition pieces in their
respective marked position. Pay at-
tention that, the parts do not tilt dur-
ing the joining on the centering seat.
• Tighten the screws slightly.
• Tighten up the bush screw fitting
with the tightening torque MA stipu-
lated in table 7 (Figure 11).
• Check the alignment of the coupling
according to „8 Coupling adjust-
ment”.
Table 7 Tightening torques MAof the sleeve threaded joints:
Size 67 82 97 112 128 148 168 194 214 240 265 295 330 370 415
DIN 912- 8.8 M6 M8 M8 M8 M10 M10 M10 M10
DIN 912-10.9 M12 M12 M14 M14 M16 M16 M16
MA [Nm] 10 25 25 25 25 49 49 49 125 125 200 200 310 310 310
Fig. 11
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10 Maintenance
The elastic coupling RINGFEDER® TNM H has in operation a low-maintenance.
Reaching the wear limit of the elastic intermediate ring depends on the operating parameters
and the conditions of use.
In the case of routine monitoring work on the plant check:
• Alignment of the coupling
• Elastomer state
• Remove dust deposits from the coupling parts and the intermediate ring
10.1 Wear Inspection on the Buffer Ring
 Injury hazard!
 Switch-off the drive before all work on the coupling!
 Secure the drive against unintentional switching on and rotating!
Perform a visual inspection and a wear inspection of the buffer ring after
2000 hours, or after 3 months at latest, after the first start-up of the equip-
ment. If only minor wear or no wear is observed, further inspections of the
plant can be carried out at regular intervals of 4000 hours, however, at least
once a year, if the operating modes and conditions of the plant remain
unchanged. However, should you observe excessive wear on the occasion
of this first inspection already, check whether the cause for the problem is
listed in table 6 “Operation faults and possible causes”. In such a case, the
inspection intervals must be adapted to the prevailing service conditions.
On the occasion of routine inspections or maintenance work on the drive equipment, or after
3 years at latest:
• Replace the elastic buffer ring.
• If the wear limit has been reached or exceeded, replace the buffer ring immediately,
irrespective of the inspection intervals of the equipment.
• Check the alignment of the coupling.
• Remove dust deposits from the coupling components and buffer ring.
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Fig. 13
Fig. 12 Buffer thickness
10.2 Wear limit of elastic buffers
Replace the elastic buffer ring as soon as the
coupling has a distinct torsional backlash, or if
the minimum buffer thickness (PDmin, Fig. 12)
acc. to table 8 has been reached.
Table 8 Minimum buffer thickness PDmin:
Size 67 82 97 112 128 148 168 194 214 240 265 295 330 370 415
PDmin [mm] 6 8 9 9 9 10 10 10 10 11 12 13 14 16 17
10.3 Changing the elastic intermediate ring
 Injury hazard!
 Switch-off the drive before all work on the coupling!
 Secure the drive against unintentional switching on and rotating!
• Remove the holding-down screws of
the reduction sleeve
• Push together the intermediate
pieces (Part 112-118) of the cen-
tring flange hubs (Part 105) with the
elastic intermediate ring (Figure 13).
• Lift-out the intermediate pieces
together with the elastic intermedi-
ate ring. Use suitable installation
aids and hoists such as cranes or
pulley blocks in the case of bigger
couplings.
• For easier mounting, the new
intermediate ring can be provided with
a slip additive before introduction (e.g.
Talcum).
• Install the new intermediate ring.
RINGFEDER® TNM H
BAWN 007-GBR-1