**Assembly of Hollow Shaft and Rolling Bearings**
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*Created on 2018/5/16*
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**Assembly of Hollow Shaft and Rolling Bearings**
Source: China Bearing Network | Time: 2014-01-13
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Industrial fine grinding mills commonly use rolling bearings, which have been widely adopted in China. These systems help save energy, improve production efficiency, reduce lubricant consumption, lower maintenance costs, and minimize environmental pollution—resulting in excellent performance. However, some manufacturers still imitate traditional methods, leading to various inefficiencies in the design of hollow shafts and rolling bearings. This can create long-term disadvantages for future operations.
To address these issues, a more efficient and reliable method has been developed for the installation of rolling bearings in hollow shaft equipment.
Previously, the method involved machining the inner diameter of the hollow shaft to fit the bearing. The bearing was then heated, placed with a top sleeve inside the discharge spiral cylinder or inlet/outlet lining, and secured with bolts. Over time, the spiral barrels and fixing bolts often loosened, causing the top sleeve to shift and allowing dust to enter the gap between the hollow shaft and the top sleeve. This dust could then reach the bearing housing, contaminating the lubricant and leading to increased friction, reduced smoothness, and potential damage to the bearing.
To overcome these problems, years of research and practical testing have led to a new and improved installation method that has shown outstanding results in several applications.
The new approach involves increasing the diameter of the rolling bearing used in the hollow shaft system. The hollow shaft is cooled using thin oil, which helps regulate the temperature of the bearing, keeping it within a safe range below 60°C.
This type of housing offers several advantages:
1. **Improved Lubrication**: Thin oil provides better lubrication than grease, reducing the friction coefficient and enhancing energy efficiency.
2. **Extended Bearing Life**: With stable operating temperatures, the bearing experiences less wear, resulting in a longer service life.
3. **Easy Oil Level Monitoring**: A visible oil level indicator allows operators to monitor and replenish oil as needed, preventing damage caused by insufficient lubrication.
4. **Compact Design**: The outer diameter of the bearing can be reduced while maintaining structural integrity, and flanges are added to the ends of the hollow shaft and spiral barrel for secure connections. A compression flange on the bearing’s inner ring prevents axial displacement.
Additionally, removing the outer sleeve helps prevent dust from entering the bearing housing, ensuring cleaner oil and extending the bearing’s lifespan. Increasing the bearing’s diameter also creates a uniform outer diameter with the hollow shaft, improving oil flow and reducing leakage. Finally, thickening the hollow shaft increases the radial clearance between the bearing and the spiral cylinders, offering better thermal insulation and cooling, which further enhances the bearing's longevity.
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For more information, visit [China Bearing Network](http://www.chinabearing.net)
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