MYII-2-type couplings have the
following features:
1) Shafts disconnects when flexible elements get damaged. This may
prevent the whole unit from significant damage in emergency
2) Flexible elements of MYII-2-type couplings are in the closed chamber
and are protected from outside mechanical particles and other external
factors;
Coupling consists of two half-couplings 1, 2 and spacer 3, which
contains flexible elements. Spacer 3 is fastened to half-couplings 1, 2
by four-eight standard bolts 4 on each side. Spacer 3 is centered with
half-couplings 1, 2 by special belts. Torque between half-couplings 1, 2
and spacer 3 is transferred by friction between their flanges. Friction
between flanges of half-coupling and spacer is provided by bolt 4
tightening.
Spacer 3 consists of a bush 12 and two flexible elements parcels
10, which include membrane 11 set, four flanges and screw fastening set.
Torque between parts in a spacer is transferred by cylindrical pins 20,
21.
Relative axial, angular and radial displacements of couplings are
compensated by flexible elements 11 deformations.
In case of damage to flexible elements 11, torque transfer between
spacer 3 and corresponding half-coupling 1 and 2 is stopped. Special
bronze bushes 14 provide spacer centering, and prevents its “flying
off” and spark. In case of single and cyclic overload by torque
(Ceasing of driven machine rotor) flexible elements operate as “weak
element” and are destroyed, at the same time they prevent more
significant uncontrolled damages of the unit. Spacer 3 may be dismantled
only in case of change of out-of-order flexible elements 11.
