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How to use flexible coupling?
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How to use flexible coupling?

Views:0     Author:Site Editor     Publish Time: 2021-05-15      Origin:Site

Flexible couplings permit some degree of misalignment and isolation of vibration. Flexible couplings are specified for connecting the input and output shafts of the transmission to the motor and compressor. We should know the tips of using flexible couplings to extend its lifespan and have a better performance.


  • How to use flexible coupling?

  • How to lubricate flexible coupling?

  • How to change flexible coupling if there is any failure?


How to use flexible coupling?

In order to facilitate the installation, put the two half flexible couplings in the incubator or oil tank for preheating, so that the inner hole size increases and it is easy to install. After installation, ensure that the shaft head of flexible coupling cannot protrude from the end face of the half flexible coupling, and it is better to be flush. Detect the distance between the two halves of the flexible coupling: take the average of the readings of 3 to 4 points measured along the two inner sides of the flange of the half flexible coupling, and the sum of the measured dimensions of the extension and the two diaphragm sets. The error is controlled within the range of 0-0.4 mm.

Alignment: Use a dial indicator to detect the runout of the flange end and outer circle of the two halves of the flexible coupling. When the flange outer circle is less than 250 mm, the runout value should not be greater than 0.05 mm. When the flange outer circle is greater than 250 mm, the jitter value should not be greater than 0.08 mm.

Install the bolts: insert the bolts from the outside of the small hole of the flange, pass through the outside of the large hole of the other flange. Put on the buffer sleeve, elastic washer, twist the nut, and tighten the nut with a wrench. If it is not installed or dismantled, it is better to rotate freely after installation without damaging the shaft and the half coupling.

Before installation, check whether the two shafts of the prime mover and the working machine are concentric, whether there are wrapping paper and bumps on the surfaces of the two shafts, whether there are debris in the inner holes of the two half flexible couplings, and whether the edges of the inner holes have bruises. If any, the shaft and half flexible coupling should be cleaned up, and the bruises should be treated with a fine file. Then check whether the inner hole diameter and length of the two half flexible couplings are consistent with the diameter and shaft elongation of the prime mover and working machine. In general selection, it is better to make the length of the prime mover and the working machine end half-coupling less than its shaft elongation 10-30 mm.

Note: Before starting the equipment, check whether the nut of the plum flexible coupling is loose or falling off. If so, tighten the nut with a wrench in time. The load pipeline valve should be opened after starting the equipment with no load for 1 minute, while the shutdown sequence is reversed. Please paint the outside of the tire coupling with oil once a month.


How to lubricate flexible coupling?

The lubrication of flexible coupling uses high-quality grease, which is compatible with flexible coupling in the same life span. And the flexible coupling of some commercial transportation vehicles, especially the existing old trucks, are still repairable.

To protect the flexible coupling from wear, the operator must:

  • According to the type, speed and size of the flexible coupling, select the appropriate grease.

  • Install a properly selected flexible coupling within the allowable deviation range, larger torque and continuous torque conditions.

  • Regularly check the equipment for leakage of lubricating oil seals, keyways, packing plugs and flange couplings; missing or loose bolts, and vibration, and regularly readjust the equipment.

  • Determine the appropriate amount of lubrication and the frequency of equipment inspection.

  • Finally, when relubricating the flexible coupling, the operator should completely disassemble the flexible coupling regularly for visual inspection and thorough cleaning

Some people use 2# extreme pressure lithium complex grease, which is based on two points. First, its fluidity is better, so that it can easily reach the lubrication part. Second, the grease has good extreme pressure resistance and is suitable for working conditions of flexible coupling.


How to change flexible coupling if there is any failure?

In the process of disassembling the flexible coupling, the most difficult task is to remove the hub from the shaft. For the hub of the flexible coupling, a three-legged puller or a four-legged puller is generally used for disassembly. The selected puller should match the outer dimensions of the hub, and the right-angle hooks of each leg of the puller should be properly combined with the rear side of the hub, so that no slippage will occur when you apply force. This method is only used for disassembly of hubs with relatively small interference.

For hubs with relatively large interference, heating methods are often used, or at the same time with hydraulic jacks for disassembly. When heating, it should be slow with segmented heating to ensure insulation should be sufficient. Generally heating flexible coupling uses trolley furnace to dry. Low-carbon and low-alloy steel is directly quenched with salt water, and medium-carbon alloy structural steel is quenched with water and oil double liquid. It is safer to use the effective thickness to calculate the residence time in water. The new water-cooling medium is suitable for forgings with simple shapes, single materials and products. The flexible coupling should generally be equipped with a torsion angle limiter, and it may not be installed under special circumstances. When the flexible coupling is used, the relative offset of the two connected shafts should not be greater than the specified allowable compensation amount. There should be no bumps, cracks, lack of glue and other defects on the rubber surface of the flexible coupling. There should be no tearing off at the rubber and metal bonding. The film marks with a depth of more than 1.0mm, slight bumps and burrs should not be deeper than 1.5 air bubbles, rubber surface defects outside this range are allowed to be ground once. The rubber in the metal, the outer wheel surface and the metal hole should be clear and clean.

During the static torsion test of the rubber elastic ring of the flexible coupling, the rubber of the rubber elastic ring should not have any cracks and the phenomenon of rubber and metal ripping under the momentary high torque.

When assembling the flexible coupling, replace with new bolts, which must be consistent with the original bolt specifications. The bolts used for the new replacement of the high-speed equipment flexible coupling must also be weighed so that the new bolts have the same weight as the connecting bolts on the same set of flanges.


Learn more something about flexible couplings can know the use tips of flexible couplings and how to change flexible couplings. If you want to buy good shaft couplings with reasonable price, FOSHAN HOUZHE TRANSMISSION EQUIPMENT CO., LTD. is your best choice. Whether from quality or price, or delivery time, we can help customers to open up a further and larger market. We have all types of different flexible couplings and if you have any questions, you can contact us or search us online.





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