Installing thin section bearings requires precision and careful handling due to their delicate nature. Unlike standard bearings, their thin design makes them more susceptible to distortion if not handled correctly.
How to install thin section bearings
1. Preparation is Key
Cleanliness: Ensure the shaft, housing, and bearing are meticulously clean and free of any dust, dirt, or foreign particles. Contaminants are a major cause of bearing failure.
Inspection:
Bearing: Visually inspect the bearing for any damage, such as nicks, burrs, or corrosion. Thin section bearings can be challenging to measure accurately with traditional tools (calipers, micrometers) in their free state as they aren’t perfectly round. Specialized tools like CMMs (Coordinate Measuring Machines) or air gages are often needed for accurate measurement.
Mating Components: Critically examine the shaft and housing for roundness and flatness. Thin section bearings conform to their mating components, so any imperfections will affect their performance and lifespan. Manufacturers typically provide strict tolerances (e.g., h7 for shafts and H7 for housings).
Lubrication: Thin section bearings usually come with a preservative oil. This should be cleaned off, and the bearing should be lubricated with a suitable oil or grease for your specific application before installation. Sealed bearings are pre-filled with grease.
Tools: Gather the necessary tools. This may include:
Arbor press or hydraulic press (recommended for most installations)
Mounting tools/fixtures (designed to apply even pressure to the correct ring)
Heating equipment (induction heater, oil bath) for shrink fitting
Cooling agents (dry ice) for expansion fitting
Feeler gauges (for checking internal clearance after installation)
Torque wrench (for clamping fasteners)
Clean cloths/wipes
2. Installation Methods
The method chosen depends on the fit (interference or clearance) and the bearing type.
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