Small Metal Disc Couplings Suit Drive Applications

Techdrives has launched the Monninghoff range of metal disc couplings, covering shaft sizes from 4-120mm and torques up to 9,000Nm in precision and positioning drive applications. The use of standard modular components to suit different configurations makes these couplings cost-effective and readily available from stock, the company said. Metal disc couplings have all-metal construction and they are robust and maintenance free. Spacer versions with up to 5m distance between shaft-ends can be supplied customised to requirements.

The key component in a metal disc coupling is the disc pack - a pre-assembled sandwich of stainless steel laminations held together by bushes at four or six bolting points. These laminations flex between the bolts to accommodate misalignments. A single-flexing coupling has one disc pack and suits applications where there is no parallel misalignment, for example where one of the shafts is floating in a single bearing. More usually double-flexing couplings are used where a central spacer bolted to the two disc packs allow for parallel as well as angular and axial misalignments.

Fitted bolts are used to connect between the external hubs and the disc packs/spacers making the assembly backlash free. As an alternative to keywayed connections, which may introduce slight backlash, clamp hubs are an available option. Metal disc couplings can transmit high torques at high speeds, potentially into thousands of kilowatts. At the other extreme, they are said to be suitable for encoder drives because of their high torsional stiffness.

They offer a maintenance-free alternative to universal, grid and gear couplings. Ideally angular misalignments should be below 0.5deg but up to 1deg or more is possible with de-rating. High ambient temperatures are generally not a problem. The Monninghoff range begins with miniature single- and double-flexing couplings rated at 1Nm and suiting shafts measuring 4-8mm.

These couplings are supplied pre-assembled with aluminium alloy hubs. Thirteen models are available with the alloy construction, but for shafts from 8mm there is also steel construction. Metal disc couplings with steel hubs and spacers are supplied in component form. Standard options include short and long central spacers, as well as clamp hubs. Monninghoff metal disc couplings are used in a range of applications, such as printing machines, steel production, and instrument drives.

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