SIEMENS
FLENDER Standard Couplings
Fluid Couplings — FLUDEX Series
General information
13/8
Siemens MD 10.1 · 2015
13
FG and FV series – drive via the housing
FLUDEX FG and FV series couplings are designed for drive via
the coupling housing. In the FV series (coupling with delay
chamber), the motor drives the coupling housing, comprising a
blade wheel (101) and a cover (102), via the flexible N-EUPEX
coupling (part 2/3) and the delay chamber (115). The rotational
flow of the coupling filling drives the blade wheel (105) and the
hollow shaft (106) on the output side, which is mounted on the
gear unit or driven machine shaft. In the FG series (basic cou-
pling), there is no delay chamber, and the flexible coupling is
directly flange-mounted on the blade wheel.
When the coupling is started up, part of the oil filling is forced
into the damming chamber. This enables the desired torque lim-
itation (approx. twice
T
N
) to be achieved during motor starting.
In the FV series the delay chamber also receives part of the oil
filling in accordance with the fluid level when the coupling is sta-
tionary. During starting the effective oil filling in the working
chamber is reduced by the amount of fluid in the delay chamber,
thus considerably reducing the starting torque (approx. 1.5
times
T
N
). From the delay chamber located on the drive side, the
oil is fed back time-dependently to the working chamber via
small holes and the coupling torque is raised, even if the output
is blocked.
This replenishing function enables a drive to be soft-started with
a very low starting torque and with an almost load-free motor. At
the same time, however, increased load torques can be over-
come by the torque increase in the coupling.
The property of the coupling with delay chamber can be used
advantageously, for example, to soft-start empty, partly loaded
and fully loaded conveyor belts.
FG series couplings are used for normal starting torque limita-
tion, as a starting clutch for isolating vibration and for overload
limitation in the event of drive blockage.
2/3
2/3
12
103
102
105
101
153
12
163
106
115
173
FGD
FVD
2/3
12
101
102
103
105
106
115
153
163
173
Damming
chamber
Working
chamber
Part 2/3 of the flexible coupling
Flexible elements
Blade wheel (outer wheel)
Cover
Fusible safety plug
Blade wheel (inner wheel)
Hollow shaft
Delay chamber
Filler plug
Screw plug (oil drain)
Oil drain plug - delay chamber
G_MD10_EN_00117
© Siemens AG 2015