A disc coupling is a mechanical connection device used to link two shafts, allowing them to transmit torque and rotational force while accommodating angular and axial misalignment. It typically consists of two hubs, metallic thin or membrane-like discs, and bolts that secure these discs together. The elastic properties of these discs enable them to absorb and compensate for deviations or vibrations between shafts while maintaining efficient power transmission and rotational accuracy. Below are a few tips that will help ensure a proper disc coupling installation that will provide years of reliable service.
Before initiating any work, it's crucial to prioritize safety by donning the appropriate personal protective equipment (PPE) and meticulously adhering to lock-out tag-out protocols for stationary equipment. This ensures the system is effectively isolated from any potential energy sources, mitigating risks. Begin the inspection process by thoroughly examining both the driving and driven shafts, along with the hub bores, meticulously checking for any accumulation of dirt or imperfections such as burrs. Take the necessary steps to clean and remove any burrs detected during the inspection. It's imperative to measure the bore and shaft diameters meticulously to ensure a precise fit.
For tapered bores, it's essential to verify a proper contact pattern. Additionally, pay close attention to the fit of the keys on the shafts; they should snugly fit from side to side, allowing for a slight clearance over the top, and the keys' corners should be chamfered for optimal performance and alignment. These meticulous checks and measures are critical for ensuring the components are in optimal condition and that subsequent operations proceed smoothly and safely.
Begin by placing the key(s) into the shaft. In the case of a hub with an interference fit bore, it's necessary to heat the hub adequately in an oven, typically to around 350°F, expanding the bore to be larger than the shaft. Avoid using an open flame if possible; however, if unavoidable, utilize a considerably large rosebud tip to ensure even heating. For precision, a thermal heat stick is recommended to accurately gauge the hub's temperature. Once expanded, carefully slide the hub onto the shaft to the desired position. Using axial stops can assist in precisely setting the position.
For hubs with clearance fit bores, ensure that the set screws in the hub don't protrude into the keyway of the bore before installation. Gently slide the hub up the shaft until it reaches the desired axial position. Finally, follow the manufacturer's installation guide to torque the set screws to the specified value. This meticulous process guarantees secure attachment while maintaining alignment as per the manufacturer's specifications.
Begin by securely attaching a dial indicator to one hub, ensuring it is rigidly mounted. Then, position the indicator on the face of the other hub. This setup allows for precise measurements of any angular misalignment between the shafts.
Next, rotate both shafts together through one complete revolution while observing the dial indicator readings. Take note of the minimum and maximum values indicated by the dial during this rotation.
After completing the rotation, calculate the difference between the minimum and maximum dial indicator readings. This calculated difference should not exceed the Total Indicator Runout (TIR) value specified in the manufacturer’s installation guide. The TIR value acts as the allowable limit for angular misalignment, ensuring that the shafts are within acceptable tolerances for proper operation.
By following these steps and ensuring that the angular misalignment stays within the manufacturer's specified limits, you can maintain the integrity and efficiency of the system, preventing potential issues associated with misaligned shafts.
Securely attach a dial indicator to one hub and position it against the outer diameter of the flange on the other hub. Rotate both shafts simultaneously for one full revolution, taking note of the lowest and highest readings on the dial indicator. Ensure that the gap between these readings does not surpass the specified Total Indicated Runout (TIR) value mentioned in the manufacturer's installation guide.
Adjust the axial spacing of the hubs to ensure that the disc packs lie flat without any visible irregularities. The distance between the faces of the hubs, which encase the disc packs, should fall within the specified limits provided for the "N" dimension in the manufacturer's installation guide.
The center member is available in various configurations, including split, adapter mount, and non-adapter mount types. This procedure focuses on mounting the center member for the latest adapter mount coupling design. For adapter-mounted center members, compress the center member sub-assembly to enable it to fit between the two piloted hubs. The mounting capscrews of the center member are installed in reverse from the center member side to compress the disc packs, reducing the center member's overall length. Ensure equal compression of the disc packs on both sides of the center member, only enough to facilitate fitting the center member assembly between the hubs. Once the compressed center member is positioned between the hubs, the compression capscrews can be loosened, allowing the center member assembly to expand into the hub pilots.
The compression capscrews, having been completely removed, are then inserted through the hubs and threaded into the adapter holes of the center member. Ensure a snug fit by tightening the capscrews to the torque specifications provided in the manufacturer’s installation manual. This torque setting is crucial as it ensures the proper compression and secure attachment of the center member within the assembly.
To ensure the alignment is precise, recheck the final positioning by measuring the "N" dimension once more. Take measurements at the 3, 6, 9, and 12 o'clock positions for both disc packs. Confirm that the "N" dimension falls within the specified range provided in the manufacturer's installation manual. This comprehensive check at multiple points across the disc packs ensures that the alignment meets the recommended guidelines outlined by the manufacturer.
The above steps on how to install a Disc Coupling are provided by the Disc Coupling manufacturer - Huading. If you have any questions, please feel free to contact us.
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