Anatomy of the sliding (smooth) bearing of the initiator (1)

**Anatomy of the Sliding (Plain) Bearing of the Starter (1)** Home > Bearing Knowledge > Analysis of the Sliding (Smooth) Bearing of the Initiator (1) Source: China Bearing Network | Time: 2014-05-14 --- Sliding bearings are commonly found in starters, including bushings and bearing bushes. These components play a critical role in ensuring the smooth operation of the starting machine. Maintaining proper clearance is essential for their performance. The failure of these bearings can be attributed to several factors, such as poor lubrication conditions, contamination, or improper installation. According to an analysis by Cummins in the U.S., the main causes of sliding bearing damage include: 1. **Contamination (45%)** – This is the leading cause of bearing failure. 2. **Lubrication issues (25%)** – Poor oil quality or insufficient filtration can lead to damage. 3. **Improper installation or equipment use (15%)** 4. **External chemical reactions or other factors (15%)** From this breakdown, it's clear that maintaining cleanliness is crucial for extending the life of sliding bearings. Ensuring clean parts during assembly, using high-quality lubricants, and avoiding dust and chemical exposure are all important steps in preventing damage. The outer bearing alloy layer on the crankshaft and connecting rod is the softest and most vulnerable part. Damage often occurs here, so regular inspection and maintenance are necessary. ### Common Causes of Sliding Bearing Damage **1. Wear from Small Particles** Small foreign particles, such as metal shavings or alloy dust, can enter the bearing surface and cause gradual wear. Even if not immediately visible, continued exposure leads to serious damage over time. This type of wear is equivalent to normal wear over 2,500 hours of operation. To prevent this, ensure the air filter is functioning properly, check for leaks in the intake system, and replace oil and filters regularly. Also, monitor fuel injection systems to avoid unburned fuel mixing with engine oil. **2. Damage from Larger Particles** If large pieces of debris, such as metal chunks or sludge, are found in the oil filter or oil pan, immediate inspection and repair are required. These particles can severely damage both the shaft and bearing. This often happens due to poor cleaning before installation, leftover machining debris, or improperly cleaned components. Always make sure all internal parts are thoroughly cleaned before assembly. **3. Foreign Objects Causing Movement Issues** Large foreign objects between the bearing and the housing can cause uneven contact, leading to localized wear and eventual failure. If such objects are present, they must be removed promptly. Before installation, inspect all parts carefully, especially oil passages and inner surfaces. Avoid working in dusty or chemically harsh environments without proper protection. --- **Recommended Reading:** - The bearing of the marine reduction gear uses high-temperature magnetic data - Key manufacturing process analysis of critical rolling bearing parts in magnetic bearings - Motor bearing noise processing - Inspection work after TIMKEN thrust bearing device --- This article is sourced from China Bearing Network. Please visit [http://www.chinabearing.net](http://www.chinabearing.net) for more information. Previous: Application and Protection of Deep Groove Ball Bearings: A Comparison of National Standards for Wheel Bearings

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