Four-point contact ball bearings are radial single row angular contact ball bearings designed to support axial loads in both directions. They can support a certain degree of radial loads and take up significantly less axial space than double row bearings. The inner ring is a split inner ring, which allows a higher number of balls to be loaded and increases the load carrying capacity. Selecting a four-point contact ball bearing involves considering several key factors to ensure it suits the specific application.
Four-point contact ball bearing selection
1. Load Type and Magnitude
Axial Load: Four-point contact ball bearings can handle both radial and axial loads. Ensure that the bearing’s axial load capacity meets the application’s requirements.
Radial Load: Determine the radial load the bearing will be subjected to. Four-point contact ball bearings typically have a lower radial load capacity compared to other ball bearings, so this needs to be considered.
Combined Loads: Four-point contact bearings are particularly useful in applications where both radial and axial loads are present. Make sure to calculate and consider the resulting combined load.
2. Bearing Size and Internal Geometry
Bearing Diameter: The size of the bearing should match the shaft diameter or housing in which it will be installed.
Contact Angle: Four-point contact bearings have a contact angle of about 35° that allows them to support both axial and radial loads. Check if this angle aligns with your application’s needs.
Clearance or Preload: This defines the amount of internal clearance between the rolling elements and raceways, which influences the bearing’s performance under load.
3. Speed Requirements
Rotational Speed: Four-point contact bearings are generally suitable for moderate to high-speed operations, but you should verify the maximum speed the bearing can handle by checking the manufacturer’s catalog.
Lubrication: High-speed applications may require special lubrication (oil or grease). Make sure to select a bearing that is compatible with the lubrication type you plan to use.
4. Environmental Conditions
Temperature: Consider the operating temperature range. Some four-point contact ball bearings are available with seals or shields for dust, moisture, and temperature resistance.
Corrosion Resistance: If the bearing will be exposed to corrosive environments (e.g., chemicals or water), choose a bearing with appropriate material coatings, such as stainless steel or ceramic bearings.
5. Precision Requirements
Precision Class: Bearings come in different accuracy classes (e.g., P0, P6, P5). For high-precision machinery, select a bearing with a higher accuracy grade.
Radial Runout and Axial Runout: For high-precision applications, the bearing’s radial and axial runout tolerances should be evaluated.
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