Pulp and Paper Canada

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A coupling for each occasion


March 1, 1999
By Pulp & Paper Canada

Thomas disc couplings have replaced gear couplings in low- and high-speed applications. They have no wearing parts, are backlash-free, and require no lubrication. The multi-piece flexible disc packs …

Thomas disc couplings have replaced gear couplings in low- and high-speed applications. They have no wearing parts, are backlash-free, and require no lubrication. The multi-piece flexible disc packs are visible, so they can be easily inspected without disassembly. To provide longer service life, the disc packs are supplied in corrosion-resistant stainless steel. These couplings are designed for infinite life, providing they are properly installed and aligned. If disc packs should fail, they are replaceable for just a fraction of the cost of a new coupling.

For the high-speed or primary side, the Thomas Series 54 RD is designed to replace close-coupled gear couplings. The small diameter of this coupling normally fits within the same space as a standard gear coupling. Once the coupling is mounted on the equipment, the disc packs can easily be replaced if necessary, without moving any pieces of the connected equipment.

Where a long-span coupling is required, on the low-speed or secondary side, the Thomas SN-GA (gear adapter) coupling offers a simple one-piece, factory-torqued assembly that bolts directly to existing gear coupling hubs mounted on the reducer and roll. The centre section is a hollow tube design, which is much lighter and easier to handle than the solid-shaft gear coupling, and it reduces weight on the connected equipment as well. This coupling is supplied, as standard, with axial adjustment shims for minute adjustments during assembly, as disc couplings require closer axial positioning than gear couplings. The SN-GA coupling can also be supplied with axial adjustment features, including positioning slip splines if desired. Many other special features can be provided, including special connections such as shrink discs.


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