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Quality wins the race: Page 3
The constant relative motion in the area of the disk pack connection means that the screw pre-tensioning force drops. The bend components to be adsorbed by the screw increase. This leads to screw breakage caused by excessive operating forces. In order to avoid this, manufacturers are forced to place appropriate limitation on such couplings with reference to alternating torques or applied operating factors. To sum up: in spite of the extremely high values stated in catalogues, a coupling in the next size up or two sizes up often has to be selected.
- ROBA-DS servocouplings are made of steel and high-strength aluminium alloys. Their extremely compact assembly and their low mass moment of inertia mean that they are predestined for highly dynamic drive systems running at high speeds.
mayr Antriebstechnik has trodden a new, unconventional path in the development ROBA-DS all-steel couplings sizes 16 to 2,200 . In order to unite high performance density with no backlash, the disks in the clamping area are treated in a special process. Specially shaped collar bushings are used for continued backlash-free torque transmission from the disk pack onto the hubs or the intermediate part which, due to the screw pre-tensioning forces available, allow absolutely backlash-free connection to the hubs This has produced a backlash-free flow of force with excellent force flow density between the input and the output of a shaft coupling. Comparatively small screws have been used. Limitation of the compensation capability due to short free bending lengths could be avoided. The nominal values defined in the catalogue can be used without any limitations, and reductions due to misalignment, overall load configuration or balance requirements is not necessary.
Every drive has its own special features and places very different requirements on the couplings which transfer the torque and which may have to compensate for any shaft misalignments. On high-speed, dynamic or reversing drives, it is usually only backlash-free couplings which are capable of fulfilling these requirements. With its disk pack couplings, steel bellows couplings and elastomer couplings, mayr Antriebstechnik has included three of the most common and attractive backlash-free shaft couplings in its program, thus offering the ideal solution for many different drives.