The application of coupling shims has been to prevent leakage between two couplings. Coupling shims have been used for some industries like Sugar mills, journal boxes in steel mills, chemicals plants, paper mills, refineries, power plants, and HVAC facilities.
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Maintenance-free and torsionally stiff connecting elements for smooth stable running.
For various decades engineers have turned to the flexible disc pack coupling for applications needing maximum reliability and uptime, minimizing wear on adjacent equipment, and eliminating the need for lubrication or maintenance of the coupling itself. Prior to the invention of the disc coupling, flexible couplings nearly always included either gear teeth that essential periodic lubrication, or rubber and plastic parts that degraded over time and mandatory replacement.
Additional, as industrial processes became more sophisticated in the latter portion of the 20th century, the need to improve coupling balance became critical as a means of reducing shaft vibration to protect the bearings and seals of the linked equipment – something the flexible disc coupling helped with a big deal. Over time the use of disc couplings has grown into a wide variety of applications, with many machine designs taking advantage of their unique characteristics. This introductory article provides a brief overview of the basic construction of industrial disc couplings and what gives them the performance and longevity that numerous engineers value.
Flexible disc packs are composed of tinny sheet metal shims, normally stamped or laser cut in a ring shape with a series of mounting holes; usually 6-8 but more or fewer are also used, reliant on the size of the coupling, with the smallest designs usually using four and with any number of holes being used for the extremely largest of disc couplings. The shims are fixed together and held in place with bushings, and the resulting disc pack is bolted into the coupling system. Misalignment compensation depends on the flexibility of the shims themselves, and usually the larger the stack, the greater the overall stiffness of the disc pack in terms of both torsion and bending. Centring of the disc pack in the coupling can be accomplished by different means, with one common way being precision machined pockets in the adjacent mounting flanges which hold the disc packs concentrically in place by their bushings.
The disc packs are mounted to their respective hubs with the bolted joints alternating amid the driving hub & the driven hub.
The portions of the disc pack bridging the distances between the respective bolted joints offer the flexibility and let a single disc pack connection to pivot and compensate for an angular bend while transmitting rotation and torque.
A single disc pack is usually rigid in shear, meaning that it cannot compensate for misalignment between 2 independently bearing supported shafts, unless utilized in conjunction with a 2nd disc pack to make the opposite angular bend and complete the parallel offset.
The exception to this rule is when a solo disc pack is used in conjunction with a self-aligning ball bearing, which replaces the 2nd disc pack in providing the second angular freedom of movement. The higher the distance between disc packs, the larger the parallel misalignment which can be compensated for at a assumed bending angle.
Owing to the diversity of applications into which flexible disc couplings are implemented, a extensive diversity of configurations exists, and maximum manufacturers offer customization and special features such as:
• Extended length steel and carbon fiber spacers
• High speed balancing
• Various clamping hub designs
• Keyway / splined hubs
• Customized end attachment flanges
• Caliper brake discs
• Built in overload disconnect clutches
• Integral wireless sensor packages
For the ultimate mixture of performance and rugged dependability, contact your supplier for flexible disc pack couplings nowadays.