Ajustes nas articulações: erros comuns a serem evitados

Joint adjustments: common mistakes to avoid

Couplings are mechanical elements used to connect two driving elements to transfer torque from one element to another. A joint connects both elements, usually shafts, that are in rotational motion, while also allowing for some degree of misalignment, end motion, or both.

In this segment of our power transmission series, we'll discuss common mistakes you can avoid to ensure your coupling lasts longer.

1. Selecting the wrong partner

Joints are a critical component in providing overall system performance and on many occasions motion control joints are selected rather late in the design process and when this happens the joints often do not meet system requirements. . As a result, changes must be made to the system for the joints to function properly. This not only takes time, which is a crucial factor in the efficiency of the system, but it also costs money to restructure the system. Therefore, it is essential that gaskets are selected at the beginning of the process to avoid these costs.

There are several design aspects to consider when selecting couplings, which include misalignment, torque inertia, rpm, shaft mounting, environment, space limitations, and service factors. These criteria must be taken into account in the selection process.

2. Alignment error

Misalignment creates loads that can exceed joint specifications and is one of the most common factors in joint failure, and the forces generated by misalignment affect not only the joint but can also prematurely fail other machinery components such as bearings, seals and gears, etc. .
Excessive misalignment between joined shafts is one of the most common reasons for coupling failure. Misalignment that produces a load that exceeds joint specifications can accelerate wear. All flexible shaft couplings are designed to allow for some misalignment and varying degrees of flexibility, so it is extremely important to know the flexibility allowed for this coupling.
When misalignment beyond specification occurs, first attempt to realign the shafts and then select the appropriate coupling.

3. Improper installation

Many times a coupling is installed hastily or many ignore the manufacturer's specifications, not thinking it is important, however it is a costly mistake that can cause premature failure. Even with maximum design effort and attention when choosing a gasket, the system would not be sufficient if the gasket was installed incorrectly.
Before installation, ensure the coupling and shafts are well prepared as shown in the checklist below:
1. Carefully clean the mating parts and lubricate the shafts
2. Verify that any misalignment between shafts is within coupling ratings
3. Tighten the fasteners in the correct order and with the required torque
During installation, be sure to center any misalignments along the length of the coupling and avoid installing the coupling too far to the left or right of the centerline. Joints must be installed without tension, they must not be compressed or stretched.
Remember to always refer to the manufacturer's specific instructions when installing a gasket.

4. Poor system maintenance

The efficiency and effectiveness of your system cannot be achieved without proper maintenance. Therefore, it is very important to carry out regular checks and look for anomalies during operation.
If the coupling fails, engineers must document the condition of the system in the event of failure. This allows for appropriate corrective actions, up to and including specification of a different coupling that better meets the needs of the application.

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