Torsionally rigid gear couplings ZAPEX ZW series

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 ZWNV, for vertical mounting positions.

Coupling suitable for potentially explosive environments. Complies with Directive 94/9/EC for:

II 2 GD c 120 °C (T4)
-20 °C ≤ T_a ≤ +80 °C

I M2

A ZAPEX coupling comprises two hub sections with external teeth which are mounted on the machine shafts. Each set of external teeth engages in a flanged socket with mating internal teeth. The flanged sleeves are connected via two flanges with close-fitting bolts.
The teeth are lubricated with oil or grease. On the ZAPEX type ZW, DUO sealing rings are used to seal the tooth space. The DUO sealing rings prevent the lubricant from escaping and dirt from entering the tooth space. The parallel keyways must be sealed during assembly to prevent lubricant from escaping.

Customized hub designs are described after the types.

ZAPEX ZW gear coupling types

Further application-related coupling types are available. Dimension sheets for and information on these are available on request.

The torque is transmitted through the coupling teeth. The teeth are crowned, so angular displacement per tooth plane is possible. Radial displacement can be compensated 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 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 misalignment.

ZAPEX gear couplings link machine shafts and compensate 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. This means that applicationspecific solutions can be delivered quickly. ZAPEX couplings require very little maintenance. Regular grease or oil changes at the prescribed intervals prolongs the service life of the coupling.

Power ratings

In the case of type ZWTR, the rated torques which deviate from the above are specified in the dimension table.

The stated torsional stiffness "ZW" applies to coupling types ZWN and ZWNV.
Torsional stiffness of the remaining types on request.

The axial misalignment ΔK_a must be understood as the maximum permitted enlargement of the hub distance S of the coupling.

Angular misalignment ΔK_W

• Types ZWN, ZZS, ZZW, ZWH, ZWB, ZBR, ZWS: ΔK_W = 1°
• Types ZWBT and ZWBG: ΔK_W = 0.2°
• Type ZWSE: ΔK_W = 0.4°

Radial misalignment ΔK_r

• Types ZWN, ZZS, ZZW, ZWH, ZWB, ZBR, ZWS und ZWSE: ΔK_r ≤ VA · tan 1°
• Types ZWBT and ZWBG: ΔK_r ≤ VA · tan 0.2°

For the tooth distance VA, see the relevant table for the subassembly.