SIEMENS
23
Siemens MD 10.3 · 2015
FLENDER Standard Couplings
Flexible Couplings – BIPEX-S Series
Technical information
■
Overview
Preliminary dimensioning
Dimensioning according to torque
The coupling must be dimensioned such that the rated torque of
the drive including service factors does not exceed the rated
torque of the coupling.
T
KN
≥
T
N
×
FB
×
FT
In order to increase the torsional rigidity and therefore minimize
the torsional backlash, it is possible to apply significantly higher
service factors for main spindle or positioning drives.
Note:
Please note the permissible temperature ranges of different cam
rings.
Checking the peak torques
The coupling size selected during the preliminary dimensioning
process must also be suitable with respect to peak torques at
the drive and load ends.
T
KN
≥
T
S
×
FB
×
FT
Checking the maximum speed
For all load situations
n
Kmax
>
n
max
Checking the permitted shaft misalignment
The actual shaft misalignment must be less than the permitted
shaft misalignment for all load situations.
Checking the shaft-hub connection
In the case of clamping connections without feather key, it must
be ensured that the transmissible torque of the hub connection
is greater than the peak torque at the coupling.
Formula symbols
Key to formula symbols
Torque characteristic
Service factor FB
Uniform
1.25
Non uniform
1.5
Rough
2.0
Temperature range
Temperature factor FT
-30 °C to +30 °C
1.0
to +60 °C
1.4
to +80 °C
1.8
to +100 °C
2.0
to +120 °C
2.8
Starts per hour
Startup factor FA
< 125
1.0
125 to 250
1.3
250 to 500
1.6
500 to 1000
1.8
> 1000
2.0
T
S
T
AS
J
L
J
A
J
L
+
-------------------
FA
×
×
or
T
S
T
LS
J
A
J
A
J
L
+
-------------------
×
FA
×
=
=
Name
For-
mula
symbol
Unit
Explanation
Rated coupling
torque
T
KN
Nm
Torque which can be transmitted as
static torque by the coupling over the
period of use.
Coupling overload
torque
T
KOL
Nm
Torque which can be transmitted
very rarely as maximum torque by
the coupling.
Peak torque at
drive end
T
AS
Nm
Peak torque during non-periodic
torque surges at drive end
Peak torque at load
end
T
LS
Nm
Peak torque during non-periodic
torque surges at load end
Peak torque
T
S
Nm
Peak torque at the coupling
Service factor
FB
Factor that expresses the real cou-
pling load as a ratio of the nominal
coupling load
Temperature factor
FT
Factor that takes into account the
reduction in strength of flexible rub-
ber materials at higher temperatures
Startup factor
FA
Factor that takes into account addi-
tional loading as a function of starting
frequency
Moment of inertia of
drive end
J
A
kgm
2
Sum of the moments of inertia at the
drive end referred to the coupling
speed
Moment of inertia of
load end
J
L
kgm
2
Sum of the moments of inertia at the
load end referred to the coupling
speed
Torsion angle
ϕ
°
Torsion angle of the coupling under
torsional load
Torsional stiffness,
dynamic
C
Tdyn
Nm/rad
Dynamic torsional stiffness of the
coupling
Axial stiffness
C
a
N/mm
Axial stiffness of the coupling
Radial stiffness
C
r
N/mm
Radial stiffness of the coupling
Rated speed
n
N
rpm
Coupling speed
Maximum coupling
speed
n
Kmax
rpm
Maximum permissible coupling
speed
Axial misalignment
Δ
K
a
mm
Axial misalignment of the coupling
halves
Radial misalign-
ment
Δ
K
r
mm
Radial misalignment of the coupling
halves
Angular misalign-
ment
Δ
K
w
°
Angular misalignment of the coupling
halves
© Siemens AG 2015