SIEMENS
FLENDER Standard Couplings
Flexible Couplings — N-EUPEX and N-EUPEX DS Series
7/7
Siemens MD 10.1 · 2015
General information
7
■
Technical data
Power ratings of the N-EUPEX series
For maximum coupling torque:
T
Kmax
= 3.0
⋅
T
KN
For coupling overload torque:
T
KOL
= 3.5
⋅
T
KN
For coupling fatigue torque:
T
KW
= 0.15
⋅
T
KN
, where T
N
> T
W
must be adhered to.
Torsional stiffness and damping
The values stated in the above table apply to a capacity utiliza-
tion of 50 %, an excitation amplitude of 10 %
T
KN
with the fre-
quency 10 Hz and an ambient temperature of 20 °C. Dynamic
torsional stiffness is dependent on load and increases in propor-
tion to capacity utilization. The following table shows the correc-
tion factors for different nominal loads.
C
Tdyn
=
C
Tdyn 50 %
⋅
FKC
The damping coefficient is
Ψ
= 1.4
Furthermore, torsional stiffness and damping depend on the am-
bient temperature and the frequency and amplitude of the tor-
sional vibration excitation. More precise torsional stiffness and
damping parameters on request.
With elastic couplings the manufacturing process of the rubber
elements and their aging primarily influence the rigidity value
C
Tdyn
. For this reason calculation must be made with a tolerance
for the dynamic rigidity of
±
20 %. The specified damping coeffi-
cient
Ψ
is a minimum value with the result that the damping per-
formance of the coupling corresponds at least to the specified
value.
Permitted shaft misalignment
The permitted shaft misalignment depends on the operating
speed. As the speed increases, lower shaft misalignment values
are permitted. The following table shows the correction factors
for different speeds.
The maximum speed for the respective coupling size must be
observed!
Δ
K
perm
=
Δ
K
1500
⋅
FKV
For fitting, a maximum gap dimension of S max. = S +
Δ
S and a
minimum gap dimension of
S min. = S –
Δ
S are permitted.
Shaft misalignments
Δ
K
r
and
Δ
K
w
may occur simultaneously.
Size
Rated torque for
flexible type
Torsional stiffness at 50 %
capacity utilization for flexible type
Assembly
Permitted shaft misalignment
at
n
= 1500 rpm
1)
65 ShoreA
80 ShoreA
90 ShoreA
65 ShoreA
80 ShoreA
90 ShoreA
Gap
dimension
2)
Radial
Angle
T
KN
T
KN
T
KN
C
Tdyn 50 %
C
Tdyn 50 %
C
Tdyn 50 %
Δ
S
Δ
K
r
Δ
K
w
Nm
Nm
Nm
kNm/rad
kNm/rad
kNm/rad
mm
mm
°
58
11
19
19
0.21
0.50
0.93
1.0
0.2
0.15
68
21
34
34
0.39
0.90
1.80
1.0
0.2
0.15
80
37
60
60
1.05
2.40
4.50
1.0
0.2
0.12
95
63
100
100
1.64
4.00
7.40
1.0
0.2
0.12
110
100
160
160
2.49
6.00
11.4
1.0
0.2
0.10
125
150
240
240
3.70
9.00
17
1.0
0.25
0.10
140
230
360
360
5.60
13.2
25
1.0
0.25
0.10
160
350
560
560
11.2
26.7
51
2.0
0.3
0.10
180
550
880
880
19.2
46
88
2.0
0.3
0.10
200
850
1340
1340
31.6
75
139
2.0
0.3
0.09
225
1260
2000
2000
48
115
212
2.0
0.35
0.09
250
1760
2800
2800
68
162
302
2.5
0.35
0.08
280
2460
3900
3900
95
226
420
2.5
0.4
0.08
315
3500
5500
5500
171
370
730
2.5
0.4
0.08
350
4850
7700
7700
235
520
950
2.5
0.5
0.08
400
6500
10300
10300
316
750
1420
2.5
0.5
0.08
440
8500
13500
13500
390
930
1920
2.5
0.6
0.08
480
10500
16600
16600
510
1200
2300
2.5
0.6
0.07
520
13300
21200
21200
600
1410
2710
2.5
0.65
0.07
560
18300
29000
29000
1000
2340
4400
3.0
0.65
0.07
610
24000
38000
38000
1300
3030
5700
3.0
0.75
0.07
660
30900
49000
49000
1640
3800
7100
3.0
0.8
0.07
710
39000
62000
62000
2140
4900
9100
3.0
0.9
0.07
Capacity utilization
T
N
/
T
KN
20 %
40 %
50 %
60 %
70 %
80 %
100 %
Correction factor FKC
65/80/90 ShoreA
0.54
0.84
1.00
1.18
1.36
1.55
1.97
Speed in rpm
500
1000
1500
3000
Correction factor FKV
1.7
1.2
1.0
0.7
1)
The maximum speed of the respective type must be noted. For further
information on permissible shaft misalignment, please see the operating
instructions.
2)
Does not apply to type H.
Gap dimension
Δ
S for types DBDR and DBD coupling sizes 250, 280,
315 and 350 as well as for type EBD coupling sizes 250 and 280 is
+2/-3 mm.
© Siemens AG 2015