KTR BoWex-Elastic User manual

KTR Kupplungstechnik
GmbH
D-48407 Rheine
BoWex-ELASTIC®
Operating-/Assembly Instructions
Design 065 (HEW1 and HEW2)
KTR-N
sheet:
edition:
40114 E
1
4
Gezeichnet: 08.04.04 Sha/Hk Ersatz für: KTR-N vom 01.12.99Schutzvermerk
ISO 16016 beachten. Geprüft: 08.04.04 Sha Ersetzt durch:
The BoWex-ELASTIC®HEW is a high flexible plug-in shaft coupling. It damps torsional
oscillations, decreases shocks and is impact sound insulating.
The BoWex-ELASTIC®HEW coupling compensates for relatively considerable shaft
displacements caused by e. g. inaccuracies in production, heat expansion etc.
Table of Contents
1 Technical Data
2 Hints
2.1 General Hints
2.2 Safety and Advice Hints
2.3 General Hints to Danger
2.4 Proper Use
3 Storage
4 Assembly
4.1 Components of the Couplings
4.2 Hint regarding the finish bore
4.3 Assembly of the Coupling
4.4 Displacements - Alignment of the Couplings
5 Enclosure A
Hints and instructions regarding the use in hazardous areas
5.1 Control intervals for couplings in hazardous areas
5.2 Checking of torsional backlash
5.3 Approximate values of wear
5.4 Permissible coupling materials in the hazardous area
5.5 Marking of coupling for the hazardous area
5.6 Starting
5.7 Breakdowns, causes and elimination
5.8 Certificate of Conformity according to the EG Standards 94/9/EG
dated 23 March 1994

KTR Kupplungstechnik
GmbH
D-48407 Rheine
BoWex-ELASTIC®
Operating-/Assembly Instructions
Design 065 (HEW1 and HEW2)
KTR-N
sheet:
edition:
40114 E
2
4
Gezeichnet: 08.04.04 Sha/Hk Ersatz für: KTR-N vom 01.12.99Schutzvermerk
ISO 16016 beachten. Geprüft: 08.04.04 Sha Ersetzt durch:
1 Technical Data
picture 1: BoWex-ELASTIC®design HEW1 picture 2: BoWex-ELASTIC®design HEW2
Table 1: dimensions
finish bore [mm] dimensions [mm]
BoWex-
ELASTIC®
size d1 max. d
2 max. D D2z x M D3D 4D Al 1l 2
42 HEW 48 50 65 162 6 M6 85 146 180 42 45
48 HEW 48 55 68 180 8 M6 92 164 200 50 45
65 HEW 65 75 96 224 8 M8 125 204 245 55 55
80 HEW 85 85 124 295,27 8 M10 130 266 318 90 70
G 80 HEW 85 95 124 333,4 8 M10 145 302 356 90 80
dimensions [mm] thread for setscrews
BoWex-
ELASTIC®
size l3l
4l 5l 7E E1L HEW1 L HEW2 G t TA
[Nm]
42 HEW 50 15 42 50 4 32 132 104 M8 10 10
48 HEW 55 17 45 50 4 32 137 109 M8 10 10
65 HEW 75 28 63 70 5 42 187 150 M10 15 1) 17
80 HEW 80 17 70 75 5 45 215 160 M10 20 17
G 80 HEW 90 22 78 90 5 55 235 185 M10 20 17
1) hub length 55 mm t = 15mm; hub length 70 mm t = 20mm.
Table 2: Torque
torque
[Nm] torque [Nm]
BoWex-
ELASTIC®
size
elastomer
hardness
[Shore A] TKN T
K max.
BoWex-
ELASTIC®
size
elastomer
hardness
[Shore A] TKN T
K max.
40 130 390 40 750 2250
50 150 450 50 950 2850
42 HEW 65 180 540 80 HEW 65 1200 3600
40 200 600 40 1250 3750
50 230 690 50 1600 4800
48 HEW 65 280 840 G 80 HEW 65 2000 6000
40 350 1050
50 400 1200
65 HEW 65 500 1500
!
CAUTION !
For a continuous and troublefree operation of the coupling it must be designed according to
the selection instructions (according to DIN 740 part 2) for the particular application
(see BoWex-ELASTIC®-catalogue).
If the operating conditions (performance, speed, changes at engine and machine) change,
the coupling selection must be checked again.

KTR Kupplungstechnik
GmbH
D-48407 Rheine
BoWex-ELASTIC®
Operating-/Assembly Instructions
Design 065 (HEW1 and HEW2)
KTR-N
sheet:
edition:
40114 E
3
4
Gezeichnet: 08.04.04 Sha/Hk Ersatz für: KTR-N vom 01.12.99Schutzvermerk
ISO 16016 beachten. Geprüft: 08.04.04 Sha Ersetzt durch:
2 Hints
2.1 General Hints
Please read through these mounting instructions carefully before you set the coupling into operation.
Please pay special attention to the safety instructions!
The BoWex-ELASTIC®-coupling is approved for the use in hazardous areas.
When using the coupling in hazardous areas please observe the special hints and instructions
regarding safety in enclosure A.
The mounting instructions are part of your product. Please keep them carefully and close to the coupling.
The copyright for these mounting instructions remains with KTR Kupplungstechnik GmbH.
2.2 Safety and Advice Hints
STOP DAN G E R ! Danger of injury to persons.
!C AU T I O N ! Damages on the machine possible.
AT T E NT I O N ! Pointing to important items.
P R E C AU T I O N ! Hints concerning explosion protection.
2.3 General Hints of Danger
STOP
DANGER !
With assembly, operation and maintenance of the coupling it has to be made sure that the
entire drive train is protected against unintentional engagement. You can be seriously hurt
by rotating parts. Please make absolutely sure to read through and observe the following
safety instructions.
•All operations on and with the coupling have to be performed taking into account "safety first".
•Please make sure to disengage the power pack before you perform your work.
•Protect the power pack against unintentional engagement, e. g. by providing hints at the place of engagement
or removing the fuse for current supply.
•Do not touch the operation area of the coupling as long as it is in operation.
•Please protect the coupling against unintentional touch. Please provide for the necessary protection devices
and caps.

KTR Kupplungstechnik
GmbH
D-48407 Rheine
BoWex-ELASTIC®
Operating-/Assembly Instructions
Design 065 (HEW1 and HEW2)
KTR-N
sheet:
edition:
40114 E
4
4
Gezeichnet: 08.04.04 Sha/Hk Ersatz für: KTR-N vom 01.12.99Schutzvermerk
ISO 16016 beachten. Geprüft: 08.04.04 Sha Ersetzt durch:
2 Hints
2.4 Proper Use
You may only assemble, operate and maintain the coupling if you
•carefully read through the mounting instructions and understood them
•had technical training
•are authorized to do so by your company
The coupling may only be used in accordance with the technical data (see table 1 and 2 in chapter 1).
Unauthorized modifications on the coupling design are not admissible. We do not take any warranty for resulting
damages. To further develop the product we reserve the right for technical modifications.
The BoWex-ELASTIC®Bauart HEW described in here corresponds to the technical status at the time of printing
of these mounting instructions.
3 Storage
The coupling hubs are supplied in preserved condition and can be stored at a dry and roofed place for 6 - 9
months.
The features of the elastomer part remain unchanged for up to 5 years in case of favourable stock conditions.
!
CAUTION !
The storage rooms may not include any ozone-generating devices, like e. g. fluorescent light
sources, mercury-vapour lamps or electrical high-voltage appliances.
Humid storage rooms are not suitable.
Please make sure that there is no condensation. The best relative air humidity is under 65%.
4 Assembly
Basically the coupling is supplied in individual parts. Before assembly the coupling has to be controlled for
completeness.
4.1 Components of the Couplings
Component Quantity Designation Component Quantity Designation
1 1 elastomer part 4 s. table 1 cap screw DIN 912
2 1 hub 5 2
setscrew DIN 916
3 1 coupling flange
picture 3: BoWex-ELASTIC®design HEW1 picture 4: BoWex-ELASTIC®design HEW2

KTR Kupplungstechnik
GmbH
D-48407 Rheine
BoWex-ELASTIC®
Operating-/Assembly Instructions
Design 065 (HEW1 and HEW2)
KTR-N
sheet:
edition:
40114 E
5
4
Gezeichnet: 08.04.04 Sha/Hk Ersatz für: KTR-N vom 01.12.99Schutzvermerk
ISO 16016 beachten. Geprüft: 08.04.04 Sha Ersetzt durch:
4 Assembly
4.2 Hint regarding the finish bore
STOP
DANGER !
The maximum permissible bore diameters d (see table 1 in
chapter 1 - Technical Data) must not be exceeded. If these
figures are disregarded, the coupling may tear. Rotating
particles may cause serious danger.
•Hub-/coupling flange bores machined by the customer have to
observe concentric running or axial running, respectively (see
picture 5).
•Please make absolutely sure to observe the figures for dmax.
•Carefully align the hub and the coupling flange when the finish
bores are brought in.
•Please provide for a setscrew or an end plate for the axial
fastening of the hub and the coupling flange.
picture 5: concentric running
and axial running
Table 3: Setscrews DIN 916
BoWex-ELASTIC®size 42 HEW 48 HEW 65 HEW 80 HEW G 80 HEW
screw size M8 M8 M10 M10 M10
tightening torque TA[Nm] 10 10 17 17 17
4.3 Assembly of the Coupling
ATTENTION !
We recommend to check bores, shaft, keyway and feather key for dimensional accuracy
before assembly.
Heating the hub and coupling flange slightly (approx. 80 °C) allows for an easier installation onto the shaft.
PRECAUTION !
Please pay attention to the danger of ignition in hazardous areas.
STOP
DANGER !
Touching the heated parts causes burns.
We would recommend to wear safety gloves.
!
CAUTION !
For the assembly please make sure that the distance dimension E (see table 1) is kept to
ensure that the elastomer part can be moved axially.
Disregarding this hint may cause damage on the coupling.
•Assemble the hub and the coupling flange onto the shafts.
•Safe the coupling hub and the coupling flange by tightening the setscrews DIN 916 with cup point or by an end
disk.
•Put the elastomer part in front of the flange hub.
•First hand-screw the parts.
•Use screws of the property class 8.8 or higher.
•Tighten the screws with a suitable dynamometric key up to the tightening torques TAindicated in table 4.

KTR Kupplungstechnik
GmbH
D-48407 Rheine
BoWex-ELASTIC®
Operating-/Assembly Instructions
Design 065 (HEW1 and HEW2)
KTR-N
sheet:
edition:
40114 E
6
4
Gezeichnet: 08.04.04 Sha/Hk Ersatz für: KTR-N vom 01.12.99Schutzvermerk
ISO 16016 beachten. Geprüft: 08.04.04 Sha Ersetzt durch:
4 Assembly
4.3 Assembly of the Coupling
Continuation:
•Safe the screwing with a suitable screw glue.
!
CAUTION !
Please observe the manufacturer´s instructions when using the glue.
Do not put any glue onto the rubber surfaces.
Table 4:
BoWex-ELASTIC®size 42 HEW 48 HEW 65 HEW 80 HEW G 80 HEW
screw size M6 M6 M8 M10 M10
number of screws 6 8 8 8 8
tightening torque TA[Nm] 14 14 35 69 69
•Displace the machine parts axially until the assembly dimension LHEW1 or LHEW2 is reached.
!
CAUTION !
For the assembly please make sure that the hub toothing is covered completely by the
internal toothing of the Elastomer part. (Please observe the assembly dimensions LHEW1
and LHEW2.)
In case of non-observance, the coupling can be damaged.
•If the position of the machine parts has already been indicated previously, the assembly dimension can be
adjusted by an axial displacement of the hub on the shaft.
4.4 Displacements - Alignment of the Couplings
The BoWex-ELASTIC®HEW couplings accept a deviation of position of the machine parts to be connected up to
the data indicated in table 5.
In case of the alignment, the radial and angular displacement should be as slight as possible, because the lifetime
is increased hereby under the same operating conditions.
The alignment of the BoWex-ELASTIC®HEW coupling has to be effected from the shaft-sided coupling hub to
one of the processed surfaces of the flange hub.
!
CAUTION !
In order to ensure a long lifetime of the coupling and to avoid dangers regarding the use in
hazardous areas, the shaft ends must be accurately aligned.
Please absolutely observe the displacement figures indicated (see table 5). If the figures are
exceeded, the coupling is damaged.
In case of a use in hazardous areas for the explosion group IIC (marking II 2G IIB T4), only the
half displacement figures (see table 5) are permissible.

KTR Kupplungstechnik
GmbH
D-48407 Rheine
BoWex-ELASTIC®
Operating-/Assembly Instructions
Design 065 (HEW1 and HEW2)
KTR-N
sheet:
edition:
40114 E
7
4
Gezeichnet: 08.04.04 Sha/Hk Ersatz für: KTR-N vom 01.12.99Schutzvermerk
ISO 16016 beachten. Geprüft: 08.04.04 Sha Ersetzt durch:
4 Assembly
4.4 Displacements - Alignment of the Couplings
radial displacements angular displacements axial displacements
picture 6: displacements
Example for the misalignment
combinations given in picture 7:
Example 1:
∆KR= 30%
∆KW= 70%
Example 2:
∆KR= 60%
∆KW= 40%
∆Ktotal = ∆KR+ ∆KW≤100 %
picture 7: combinations
of displacement
Table 5:
BoWex-ELASTIC®HEW size
displacements elastomer-hardness
[Shore A] W 42 HE 42 HE 48 HE 65 HE 80 HE G 80 HE
40 1,0 1,1 1,2 1,6 1,8 2,0
50 - 1,0 1,1 1,5 1,7 1,9
perm. radial displacement
with n=1500 1/min.
∆Kr (mm) 65 - 0,5 0,5 0,7 0,8 0,9
40 0,7 0,8 1,1 1,4 1,6 1,8
50 - 0,7 1,0 1,3 1,5 1,7
perm. radial displacement
with n=3000 1/min.
∆Kr (mm) 65 - 0,4 0,4 0,5 0,6 0,8
40 3,2 3,6 3,8 5,1 5,7 6,0
50 - 3,3 3,5 4,7 5,3 5,7
max. radial displacement
∆Krmax. (mm) 1) 65 - 1,5 1,7 2,2 2,4 2,7
40 1,0 1,0 1,0 1,0 1,0 1,0
50 - 0,75 0,75 0,75 0,75 0,75
perm. angular displacement
with n=1500 1/min.
∆Kw (°) 65 - 0,5 0,5 0,5 0,5 0,5
40 0,5 0,5 0,5 0,5 0,5 0,5
50 - 0,4 0,4 0,4 0,4 0,4
perm. angular displacement
with n=3000 1/min.
∆Kw (°) 65 - 0,25 0,25 0,25 0,25 0,25
max. angular displacement
∆Kwmax. (°) 1) 40 / 50 / 65 1,5 1,5 1,5 1,5 1,5 1,5
perm. axial displacement
∆Ka (mm) 40 / 50 / 65 ±2 ±2 ±2 ±2 ±2 ±3
1) for short-term start

KTR Kupplungstechnik
GmbH
D-48407 Rheine
BoWex-ELASTIC®
Operating-/Assembly Instructions
Design 065 (HEW1 and HEW2)
KTR-N
sheet:
edition:
40114 E
8
4
Gezeichnet: 08.04.04 Sha/Hk Ersatz für: KTR-N vom 01.12.99Schutzvermerk
ISO 16016 beachten. Geprüft: 08.04.04 Sha Ersetzt durch:
5 Enclosure A
Hints and instructions regarding the use in hazardous areas
design 065: hub / elastomer part / coupling flange
5.1 Control intervals for couplings in hazardous areas
explosion group control intervals
II 2G c IIB T4
A checking of the circumferential backlash and a visual check of the eleastomer part must
be effected after 3000 operating hours for the first time, after 6 months at the latest.
If you note an unconsiderable or no wear at the elastomer part after this first inspection, the
further inspections can be effected, in case of the same operating parameters, respectively
after 6000 operating hours or after 18 months at the latest.
If you note a considerable wear during the first inspection, so that a change of the
elastomer part would be recommended, please find out the cause according to the table
„Breakdowns“, as far as possible.
The maintenance intervals must be adjusted according to the changed operating
parameters.
BoWex®-coupling
picture 8: BoWex-ELASTIC®(design HEW1)
Here the backlash between the hub and the nylon toothing by the elastomer part must be checked by a torsional
backlash.
The friction / wear may only be Xmax. of the original toothing strength before the nylon elastomer part must be
exchanged.
When reaching the torsional backlash ∆Smax, the nylon elastomer part must be exchanged immediately,
irrespective of the inspection intervals.

KTR Kupplungstechnik
GmbH
D-48407 Rheine
BoWex-ELASTIC®
Operating-/Assembly Instructions
Design 065 (HEW1 and HEW2)
KTR-N
sheet:
edition:
40114 E
9
4
Gezeichnet: 08.04.04 Sha/Hk Ersatz für: KTR-N vom 01.12.99Schutzvermerk
ISO 16016 beachten. Geprüft: 08.04.04 Sha Ersetzt durch:
5 Enclosure A
Hints and instructions regarding the use in hazardous areas
5.2 checking of torsional backlash
!
CAUTION !
To check the torsional backlash the turned off drive aggregate must be secured against
unintended turning on.
•Turn the hub in opposite direction to the direction of drive.
!
CAUTION !
Here the elastomer part may not be axially displaced from its wear position.
•Mark elastomer part and hub (see picture 9).
•Turn the hub in the direction of drive and measure
the torsional backlash ∆Smax.
•When reaching the torsional backlash ∆Smax the
elastomer part must be exchanged.
picture 9: marking of the hub and the elastomer part
5.3 Approximate values of wear
If the torsional backlash is ≥∆Smax. [mm] / friction ≥Xmax. [mm], the elastomer part must be exchanged.
The reaching of the exchange values depends on the operating conditions and the existing operating parameters.
!
CAUTION !
In order to ensure a long lifetime of the coupling and to avoid dangers regarding the use in
hazardous areas, the shaft ends must be accurately aligned.
Please absolutely observe the displacement figures indicated (see table 5). If the figures are
exceeded, the coupling is damaged.
picture 10: elastomer part in new condition picture 11: wear of elastomer part

KTR Kupplungstechnik
GmbH
D-48407 Rheine
BoWex-ELASTIC®
Operating-/Assembly Instructions
Design 065 (HEW1 and HEW2)
KTR-N
sheet:
edition:
40114 E
10
4
Gezeichnet: 08.04.04 Sha/Hk Ersatz für: KTR-N vom 01.12.99Schutzvermerk
ISO 16016 beachten. Geprüft: 08.04.04 Sha Ersetzt durch:
5 Enclosure A
Hints and instructions regarding the use in hazardous areas
5.3 Approximate values of wear
Table 7:
limits of wear each hub limits of wear each hub
BoWex®
size friction
Xmax. [mm] torsional backlash
∆Smax. [mm]
BoWex®
size friction
Xmax. [mm] torsional backlash
∆Smax. [mm]
42 1,0 1,7 80 1,6 2,7
48 1,0 1,8 G 80 1,6 2,7
65 1,4 2,5
5.4 Permissible coupling materials in the hazardous area
In explosion group IIB aluminium is not allowed as material for coupling hubs.
5.5 Marking of coupling for the hazardous area
Couplings for the use in hazardous areas are marked for the respectively permissible conditions of use.
Explosion group IIB: II 2G c IIB T4 -20°C ≤Ta≤+80°C
5.6 Starting
Before putting the coupling into operation, check the tightness of the grub screws in the hubs, the alignment and
the distance dimension E and correct, if necessary, and also check all screw connections regarding the stipulated
tightening torques dependent on the type of coupling.
If used in hazardous areas, the grub screws must be additionally secured against self-loosening to
fix the hub, e. g. with Loctite (medium strength).
Last but not least, the coupling protection against unintended contact must be fixed.
Coupling protection in the hazardous area.
Covering of the coupling
The couplings must be provided with firm coverings protecting the couplings against falling objects.
There can be regular openings in the coverings which may not exceed the following dimensions:
circular openings
diameter in mm rectangular openings side length in mm
top surface of the covering 4 4
side parts of the covering 8 8