Product —  14th Aug 2014

Geislinger BF 63/50/2HSO/L - an enhanced BF-coupling, optimized for limited spaces

The  Geislinger  Gesilco®  coupling  has  been  designed  to  compensate  radial,  axial  and angular misalignments. This versatility allows Gesilco® couplings to connect resiliently mounted engines to power trains and compensate for misalignments in virtually any other application.

The  standard  design  of  the  patented  Gesilco®  Butterfly  “BF”  coupling consists  of two membranes, an intermediate shaft and two flanges. Membranes, intermediate shaft and flanges are manufactured as a single piece made of advanced composite material. The halves of  the  coupling  are  bolted  together  at  the  flanges  with  fitted  bolts.  By use of variable thickness spacers, installation tolerances and centering recess can be compensated. At the inner radius the coupling is connected to the driving and driven components by pre-stessed screws. Up to now, one of the halves had to be connected with screws from the outer side of the flange. This required some extra space. In order to reduce the length of the coupling we had to find out how it would be possible to open the coupling from the intermediate shaft. This would mean that all bolts have to be installed from the inside of the coupling. This problem was solved by an innovative design, including openings in the intermediate shaft, as shown in the image above.

The following pictures show the assembly procedure:

Picture 1: The coupling halves in the assembly position.  Picture 2: Now the bolts can be manually assembled.
Picture 1: The coupling halves in the assembly position. Picture 2: Now the bolts can be manually assembled.
Picture 3:	Even the torque spanner fits through the opening. Picture 4: Afterwards the coupling halves are turned to the operating position and bolted together.
Picture 3: Even the torque spanner fits through the opening. Picture 4: Afterwards the coupling halves are turned to the operating position and bolted together.

This assembly process was chosen because of the reduction of the stiffness caused by the openings. In addition, the level of friction in the connection of the coupling halves has been increased, which allows a smaller pitch circle thus a longer membrane with increased displacement efficiency. A logical consequence is to have a shorter installation length and therefore less weight with the same displacement efficiency of the whole coupling. In addition the structure-borne noise of the coupling has been investigated and minimised. First couplings with a diameter of 630 mm and 20KNm torque will be available in the new design. Other coupling sizes will follow.