What is the most common cause of bearing failure

Bearing failure analysis PDF

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Bearings are important for optimal functioning of mechanical systems. Bearings support the weight of rotating shafts and contribute to reduced friction. Poor bearing performance can lead to expensive repairs, and in some cases, catastrophic breakdowns. This article aims to understand and explain the distinct kinds of bearing failures, their root causes, warning signs, and prevention measures.

Bearing failures can lead to costly repairs, downtime, and even catastrophic failures. Understanding the types, causes, and symptoms of bearing failures is essential for preventing them. Proper maintenance and inspection practices, such as proper lubrication, regular maintenance, and load monitoring, can help prevent bearing failures. In the event of bearing failure, prompt repair or replacement is essential to avoid further damage. By implementing proper maintenance and inspection practices, bearing failures can be prevented and equipment life can be extended.

Bearing failure effects

Regular inspections and maintenance are essential for preventing bearing failures. Inspecting the equipment and bearings for signs of wear, damage, or contamination can help identify potential issues early. Proper lubrication and alignment are also critical for preventing bearing failures. Regular maintenance, such as bearing cleaning and lubrication, can also extend the life of the bearings.

The most common types of bearing failures are Overheating, Contamination, Inadequate Lubrication (including Excessive and Incorrect Lubrication), Misalignment, Corrosion, Brinelling, Electrical Pitting, Improper Mounting, and Bad Fits.

Bearing failure symptoms

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Inadequate or lack of lubrication is a common cause of bearing failure. Proper lubrication is a crucial factor in reducing friction and preventing metal-to-metal contact. Insufficient lubrication leads to increased friction, overheating, and premature wear.

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Lubrication contamination is another common cause of bearing failure. It can occur due to foreign particles, such as dirt, dust, moisture, or anything entering the bearing. Contaminants cause the lubricant to become abrasive, a source for corrosion and surface damage like pitting, and leading to premature wear and failure.

Electrical Pitting can occur due to stray electrical currents passing through the bearing. It can cause damage to the bearing surface, leading to premature wear and eventual failure.

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Identifying the type of bearing failure can help determine the problem’s root cause and implement effective corrective actions. The following are some methods for identifying each type of bearing failure:

Brinelling is a permanent indentation in the raceways of the bearings. Brinelling is the permanent plastic deformation of the bearing surface and occurs when the rolling elements (ball or rollers) and the raceway’s material yield strength have been exceeded.

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Bearing failure Chart

Elevated temperatures cause the lubricant to break down, reducing its effectiveness in preventing metal-to-metal contact. Overheating can lead to premature wear, fatigue failure, and bearing seizures.

It is essential to identify the symptoms of bearing failures early to prevent catastrophic failure. Some of the symptoms of bearing failure include:

The indentations in the raceways can quickly lead to chattering and excess vibration, which in turn can accelerate other forms of wear, such as spalling, and ultimately lead to failure of the bearing.

Bearing failure reasons

Improper mounting can cause alignment issues, uneven loading, and stress on the bearing, leading to premature wear and eventual failure. Poor Fits will cause creep in the bearing.

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Types of bearingfailuresand their causes

Misalignment occurs when the bearing is not correctly aligned with the shaft or housing. It can cause uneven loading and increased stress on the bearing, leading to premature wear and eventual failure.

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Types of bearingfailures

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Preventing bearing failures involves implementing proper maintenance and inspection practices. The following are some methods for preventing bearing failures:

Corrosion can occur due to exposure to harsh environments, salt water, blood, and numerous other things including chemicals. Corrosion causes pitting, cracking, and surface damage, leading to premature wear and eventual failure.

Excessive operating temperature is a leading cause of bearing failure. When a bearing’s temperature exceeds its recommended limit, failure can occur. Excessive temperatures are due to inadequate lubrication, excessive loads, or a combination of both.

If a bearing failure occurs, it is essential to repair or replace the bearing promptly to prevent further damage. Bearing repair involves inspecting the bearing surface for any damage, cleaning the bearing, and replacing any damaged components. If the damage is extensive, replacing the bearing may be necessary.