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How to lubricate flexible coupling?
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How to lubricate flexible coupling?

Views:0     Author:Site Editor     Publish Time: 2021-05-09      Origin:Site

You should be familiar with the flexible coupling. Flexible coupling is used to connect two shafts of different machines. Flexible coupling is a mechanical part that allows the machine to rotate together to transmit torque, which is a more critical part. So now we briefly introduce to you about improving the lubrication conditions of the flexible coupling so that its performance becomes more excellent.


  • Why it is important to lubricate flexible coupling?

  • How to lubricate flexible coupling?

  • How to improve the lubrication condition of flexible coupling?


Why it is important to lubricate flexible coupling?

When the lubrication effect of the flexible coupling and the bearing bush fails to meet the requirements, a variety of failures will appear. Certain types of bearings that are really difficult to buy have no spare parts and have to be repaired after failure, especially imported bearings. Bearings with minor damage, such as slight water rust during inventory, and slight fretting abrasion during transportation will cause dry friction of the part between the shaft and the bearing bush due to direct contact if the oil pressure is low. At this time, the shaft surface is blue. If the lubricating oil fails or the pressure cannot be built up, the moving surface will lose the protection of the oil film and directly contact for dry friction. When the temperature rises, the alloy layer of the bearing bush will melt, and the bush will be held when the machine is stopped in time. Failure to stop the machine in time will cause more serious damage to the parts.

Flexible couplings are used to protect equipment from pressure and wear, reducing downtime and costs. Although these components of flexible couplings are usually smaller than the connected equipment, they play a major role in equipment reliability. Appropriate selection, installation and maintenance of flexible couplings can help greatly extend the service life of the equipment. These flexible couplings consist of metal surfaces that slide and rotate towards each other, and require lubrication to prevent wear. Because the small contact area bears high loads, grease containing high-viscosity oil is required.

The grease selected for the flexible coupling must also be carefully formulated to withstand centrifugal force. The centrifugal force may vary greatly due to the diameter and rotation speed of different flexible couplings, and may adversely affect the performance of the grease.

In fact, the most versatile greases do not consider the centrifugal force of the flexible coupling, which usually contain thickeners with a higher mass density than oil. If such thickeners are used in a rotating flexible coupling, it will push the lubricating oil towards the center of the flexible coupling, making it ineffective. Therefore, a suitable grease should be selected for the flexible coupling.



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 improve the lubrication condition of flexible coupling?

In high-speed and heavy-duty power transmission, some flexible couplings also have the function of buffering, damping and improving the dynamic performance of the shafting. The flexible coupling is composed of two halves, which are respectively connected with the driving shaft and the driven shaft.

The general power machine is mostly connected with the working machine by means of a flexible coupling. Good lubrication is essential for the reliable operation of the flexible coupling. The main oil pump of the steam turbine is mostly lubricated with turbine oil. According to installation experience, most flexible coupling lubricating oil is taken from the lubricating oil pipe. During maintenance, it was found that due to the thin tubing. The tubing was often bent during maintenance and disassembly, and the bent position had a certain throttling of the lubricating oil. There were weld defects during butt welding of tubing. If there is debris in the pipeline, there is a risk of oil cut. During on-site inspections, it has been found that the flexible coupling has failed to lubricate. Especially for hydraulic adjustment systems, there are more oil pipelines in the front tank, and the oil pipeline is easier to bend. Be careful when overhauling. When necessary, the diameter of the main pipe section of the oil pipe can be increased to reduce the throttling loss in the pipeline, as well as increasing the pressure of the oil.


Learn more something about flexible couplings can know the importance of lubricating flexible couplings and how to lubricate 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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