M3560-02en Edition 09/2022 21
Description
3
The ZAPEX couplings described here are universally applicable, torsionally rigid gear coup-
lings that are available in various types and sizes. The couplings can be used in accordance
with the Explosion Protection Directive in potentially explosive atmospheres if they have a
corresponding marking.
These instructions describe the assembly and operation of a ZAPEX coupling arranged hori-
zontally with a shaft-hub connection made by a cylindrical or conical bore with parallel key or
by a pressurised oil interference fit. Please consult Flender if you want to use a different type
of installation. The ZNNV and ZNZV types are arranged vertically.
Application
ZAPEX couplings are designed for use in all kinds of machines. They are designed to with-
stand high torques and harsh operating conditions.
Structure
The ZAPEX coupling consists of the two hub parts (1) and (2) with external teeth, which are
fitted onto the machine shafts. The external teeth engage in a flanged sleeve (5) in each
case, which has corresponding internal teeth. The flanged sleeves (5) are bolted together
with fitting bolts (8) and nuts (9) or with fitting bolts (8), nuts (9) and a spacer (4). The ex-
ternal teeth of the hub parts (1), (2) are not arranged in the centre of the hub. Depending on
the mounting position, this results in the A, B or AB variants with the different shaft distance
dimensions S.
The gear is lubricated using grease. O-rings (12) are used to seal the grease spaces extern-
ally. The parallel keyways must be sealed against lubricant leakage during assembly.
For the ZNNA type, the axial backlash is restricted by the retaining ring (51), for the ZNZA
type by the plate pullies (20).
The spare parts drawings and spare parts list can be found at Spare parts drawing and
spare parts list (Page58).
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