SIEMENS
FLENDER Standard Couplings
Flexible Couplings — RUPEX Series
8/5
Siemens MD 10.1 · 2015
General information
8
For maximum coupling torque:
T
Kmax
= 3.0
⋅
T
KN
For overload torque:
T
KOL
= 4
⋅
T
KN
For coupling fatigue torque:
T
KW
= 0.20
⋅
T
KN
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.
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
ambient temperature and the frequency and amplitude of the
torsional 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 and type
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.
Capacity utilization
T
N
/
T
KN
20 %
40 %
50 %
60 %
70 %
80 %
90 %
100 %
Correction factor FKC
65/80/90 ShoreA
0.51
0.83
1.00
1.18
1.38
1.58
1.80
2.03
Speed in rpm
500
1000
1500
3000
Correction factor FKV
1.7
1.2
1.0
0.7
© Siemens AG 2015