FLENDER Standard Couplings Fluid Couplings — FLUDEX Series © Siemens AG 2015 General information FG and FV series – drive via the housing 101 103 102 153 12 FGD 105 2/3 Damming chamber 2/3 12 Part 2/3 of the flexible coupling Flexible elements 106 101 102 Blade wheel (outer wheel) Cover G_MD10_EN_00117 103 Fusible safety plug 105 106 Blade wheel (inner wheel) Hollow shaft 2/3 Working chamber 153 115 Delay chamber Filler plug 115 173 12 FVD 163 Screw plug (oil drain) 163 173 Oil drain plug - delay chamber 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. 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. 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, 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. 13 13/8 Siemens MD 10.1 · 2015