FLENDER Coupling

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ZAPEX ZN Torsionally Rigid Gear Coupling

II 2G Ex h IIC T6 ... T5 Gb X
II 2D Ex h IIIC T85 °C ... 100 °C Db X

I M2 Ex h Mb X

product details

Your benefits at a glance

ZAPEX gear couplings link machine shafts and compen-sate for shaft misalignment with weak restorative forces. High transmissible torque combined with compactness and light weight are characteristic of ZAPEX couplings.

ZAPEX coupling types are constructed on a modular principle, so application-related solutions can be delivered quickly.

This coupling requires very little maintenance.

Regular grease changes at the prescribed intervals prolong the service life of the coupling.

application

ZAPEX couplings are especially suited for operation in harsh operating conditions, such as drives in the iron smelting or cement industry.

ZAPEX couplings are suitable for reverse operation and horizontal mounting positions and, in the case of type

ZNNV, for vertical mounting positions.

Design and configurations

A ZAPEX coupling comprises two hub sections with external teeth which are mounted on the machine shafts. The external teeth engage with a flanged sleeve with corresponding internal teeth. The flanged sleeves are connected via two flanges with close-fitting bolts.

The teeth are lubricated with grease. On the ZAPEX type ZN, O-rings are used to seal the tooth space. The O-rings prevent the lubricant from escaping and dirt from ente-ring the tooth space. The parallel keyways must be sealed during assembly to prevent lubricant from escaping.

Customized hub designs are described after the types.

Function

The torque is transmitted through the coupling teeth.

The teeth are crowned, so angular displacement per tooth plane is possible. Radial displacement can be compen-sated for via the space VA between the tooth planes.

The internal teeth of the flanged sleeves are significantly wider than the external teeth of the hub parts, permitting a relatively high axial misalignment.

A small angular misalignment on the coupling teeth results in an advantageous distribution of the lubricant film in contact with the teeth and a very low wear rate. This favorable condition can be deliberately set by aligning the drive with the machine shafts with a slight radial misalign-ment.