Installation and Operating Instructions TSCHAN - Tschan GmbH

Installation and Operating Instructions
1 Function
The Nor-Mex ® Coupling Type GTW/GBS is an
torsionally flexible and shock-proof claw coupling with
brake disc and removable claw ring. They compensate
for angular as well as radial and axial shaft
misalignment within fixed tolerances. The torque is
transmitted through an elastic transitional ring.
The elastic transitional ring made of Perbunan (Pb)
with nitrile rubber as the base material dampens
shocks and torsional vibrations, is oil-proof, insensitive
to temperature and normally electrically conductive.
This prevents undesirable static charging, among
other things.
2 Construction
1 2
TSCHAN
1 Hex head socket bolt
2 Lock washer
3 Claw ring
4 Flange hub
5 Elastic transitional ring
6 Coupling hub
7 Brake disc
GTW 1 – Twiflex, offset
GTW 2 – Twiflex, offset
(GTW 1, reversed)
GBS – straight
8 Lock washer
9 Hex head bolt
3
4
5
6
7
GTW1
The coupling can be used for either direction of
rotation and be installed in any position.
One coupling half consists of a hub and a bolt on claw
ring, for easy separation of the coupled machine. With
the claw ring unbolted and slid back, a check of the
rotational direction of the drive is possible. In the same
manner, a coupling half with the associated aggregate
can be removed radially.
The elastic transitional ring permits replacing of
machines without axial displacement (Section 7).
8 9
Flexible Coupling
Nor-Mex ® GTW/GBS
7
GTW2
7
GBS
BAWN004-GBR-0
Note:
The claw ring (Pos. 3) and Flange hub
(Pos. 4) as well as the coupling hub
(Pos. 6) and brake disc (Pos. 7) are
delivered assembled.
Balanced parts are marked with respect
to each other.
TSCHAN GmbH • Zweibrücker Straße 104 • D-66538 Neunkirchen-Saar
Telefon (0 68 21) 8 66-0 Fax (0 68 21) 8 83 53
1

• Remove the elastic transitional ring (Fig. 2, Pos. 1).
• Clean the holes in the flange and coupling hubs, the
shaft ends and the disc brake shoes before
installing.
• For larger couplings, use suitable installation aids.
• Place the flange hub with claw ring and the coupling
hub with brake disc on the shaft ends (Fig. 2,
Pos. 2).
Note:
For easy installation, the uniform warming of the hubs
to between 80 and 120° C is completely safe.
2
3 Observe before Installation
WARNING!
Before performing any work on the
coupling, switch off the motor!
Secure the motor against switching on
unintentionally!
• Ensure that the intended rotational speed and the
torque as well as the operating temperature do not
exceed the allowable values in the current
Catalogue No. 3.
4 Installing the Coupling
WARNING!
Gloves must always be worn in order to
avoid injury due to hot coupling parts!
• Slide the hubs onto the shaft to achieve full
engagement only, e.g. the shaft end should be flush
with the end of the hub and not protrude into the
claw ring (Fig. 3).
Observe deviating agreements!
CAUTION!
Allow the hot hubs to cool before inserting the
elastic transitional ring.
• Before inserting the elastic ring apply lubricant
(e.g. talcum).
• Insert the transitional ring.
• Join the shafts with the mounted coupling hubs
(Fig. 4).
Note:
If a drive shaft with a coupling half is installed radially,
unbolt and slide back the claw rings. For installation,
see Section 7.
• If static charging must be avoided in operation, coordination
with TSCHAN is required before
installation of the coupling.
• The maximum allowable size of the bore diameter
in the coupling hub as well as the flange hub is
according to the current Catalogue No. 3.
• Standard tolerances for the bores are according to
ISO Fit H7 (DIN 7161, sheet 2).
• Standard key groove according to DIN 6885,
sheet 1.
• Set screws as required.
Fig. 2
Fig. 3
Fig. 4
1
2
2

5 Coupling Alignment
Recommended alignment values – angular
• Measure a complete revolution (360°).
Determine the largest deviation z1 as well as the
smallest deviation z2 (Fig. 5).
Calculate the angular misalignment ∆z = z1 – z2.
• When aligning, comply with the maximum allowable
angular misalignment ∆zmax according to Table 1.
The values according to Table 1 apply for a
reference speed of 1500 RPM.
Table 1
Recommended alignment values – radial
• Measure a complete revolution (360°).
Determine the largest deviation y1 as well as the
smallest deviation y2 (Fig. 6).
Calculate the radial misalignment y = 0.5 · (y1 – y2).
• When aligning, comply with the maximum allowable
radial misalignment ymax according to Table 2.
The values according to Table 2 apply for a
reference speed of 1500 RPM.
Table 2
WARNING!
Before performing any work on the
coupling, switch off the motor!
Secure the motor against switching on
unintentionally!
Note:
Exact alignment of the coupling increases the service
life of the elastic transitional ring.
Recommended alignment values – axial
• Measure the axial assembly play S (Fig. 7).
• When aligning, comply with the allowable
tolerance x according to Table 3.
CAUTION!
If larger axial misalignments are expected in
operation, coordination with TSCHAN is
necessary.
Fig. 5
Fig. 6
Table 3 Fig. 7
The maximum allowable misalignments given in
Tables 1 to 3 are general standard values. In special
cases with increased demands on quiet running or
higher RPM, an alignment accuracy of ≤ 0.1 mm in the
three displacement planes can be necessary.
For further information, see Factory Standard TWN.
Size 112 128 148 168 194 214 240 265 295 330 370 415
∆zmax [mm] 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3
Size 112 128 148 168 194 214 240 265 295 330 370 415
ymax [mm] 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3
Size 112 128 148 168 194 214 240 265 295 330 370 415
S [mm] 3.5 3.5 3.5 3.5 3.5 4.0 4.0 5.5 8.0 8.0 8.0 8.0
x [mm] ±1.0 ±1.0 ±1.0 ±1.5 ±1.5 ±2.0 ±2.0 ±2.5 ±2.5 ±2.5 ±2.5 ±2.5
Δ z
y
S±x
y
180°
180°
180°
180°
3

• Before a check of the rotational direction of the
drive system, secure the loose claw ring against
axial displacement.
• Before placing into operation, check the tightening
torques MA1 and MA2 of the bolts according to
Tables 4 and 5 (Fig. 8).
• Unbolt the claw ring and slide it back (Fig. 9,
Pos. 1).
• Cut through the transitional ring at one of the
connecting webs.
• Remove the transitional ring (Fig. 9, Pos. 2). Start
with the cut-through connecting web.
• Apply lubricant (e.g. talcum) to a new elastic
transitional ring before inserting.
• Cut through the new transitional ring at one of the
connecting webs and insert between coupling hub
and flange hub.
CAUTION!
Balanced parts are marked with respect to each
other. The contact surfaces of the claw ring and
flange hub must be clean as well as free of oil and
grease.
• Place the claw ring in the marked position.
• Tighten the bolts lightly and uniformly.
• Tighten the bolts with the tightening torques MA
according to Tables 4 and 5 (Fig. 8).
4
6 Operation
Table 4
Size 112 128 148 168 194 214 240 265 295 330 370 415
DIN 933-8.8 M8 M8 M10 M10 M12 M12 M12 M16 M16 M16 M16 M16
MA1 [Nm] 25 25 49 49 85 85 85 210 210 210 210 210
Table 5
Size 112 128 148 168 194 214 240 265 295 330 370 415
DIN 912-8.8 M8 M8 M10 M10 M10
DIN 912-10.9 M12 M12 M14 M14 M16 M16 M16
MA2 [Nm] 25 25 49 49 49 125 125 200 200 310 310 310
WARNING!
Before placing into operation, all moving
parts must be covered with stationary
protective devices.
The Nor-Mex ® Coupling Type GTW/GBS requires little
maintenance in operation.
Check during routine control of the drive system:
• Alignment of the coupling
• Condition of the elastomer
7 Replacing the Elastic Transitional Ring
WARNING!
Before performing any work on the
coupling, switch off the motor!
Secure the motor against switching on
unintentionally!
Fig. 8
Fig. 9
M A2
1
2
M A1
During maintenance work on the drive system or after
five years at the latest:
• Replace the elastic transitional ring.
Note:
If a coupling half with the associated aggregate is lifter
radially, the transitional ring can be axially replaced.
The coupling must again be aligned (see Section 5).
WARNING!
Before placing into operation, install all
protective devices!