SIEMENS
FLENDER Standard Couplings
Flexible Couplings — N-EUPEX and N-EUPEX DS Series
General information
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Siemens MD 10.1 · 2015
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Overview
N-EUPEX as overload-holding, fail-safe series
N-EUPEX DS as overload-shedding, non-fail-safe series
N-EUPEX and N-EUPEX DS pin couplings connect machines.
They compensate for shaft misalignment, generating only low
restorative forces.
The torque is conducted through elastomer flexibles, so the cou-
pling has typically flexible rubber properties.
N-EUPEX couplings are overload-holding. By contrast, the
N-EUPEX DS series is designed so that overload or advanced
wear causes irreparable damage to the elastomer flexibles. The
metal parts of N-EUPEX DS couplings can then rotate freely
against one another without contact.
Elastomer flexible of the N-EUPEX series
The flexibles of the N-EUPEX coupling are subjected to com-
pression. If the flexibles are irreparably damaged, the hub parts
come into contact with metal. This "emergency operation capa-
bility" is required, e.g., in the case of fire pump drives.
Elastomer flexible of the N-EUPEX DS series
The flexibles of the N-EUPEX DS series are subjected to com-
pression and bending forces. If the flexibles are irreparably
damaged, the metal parts turn against one another without con-
tact, and the power transmission is separated. Fitting new flexi-
bles will make the coupling once more usable.
The capacity of the N-EUPEX DS series to shed overloads is
especially in demand for highly sensitive machines.
G_MD10_XX_00068
N
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E
U
P
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X
G_MD10_XX_00069
N
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E
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X
D
S
© Siemens AG 2015