Ball Bearings

In mechanical motion systems, ball bearings are considered one of the most common and essential types of rolling bearings. From household electric fans to massive industrial conveyor systems, the presence of ball bearings ensures smooth and durable operation. So, what exactly is a ball bearing? Why is its “point contact” structure so efficient? Let’s explore in detail with Belota below.

What is a Ball Bearing?

A ball bearing is a type of rolling-element bearing that uses spherical balls to maintain the separation between the inner and outer raceways.

Unlike roller or needle bearings, ball bearings operate on a point-contact principle between the ball and the raceway surface. This significantly reduces friction during rotation, allowing equipment to run at high speeds with minimal noise and vibration. Its main functions are to support loads, reduce friction, and maintain shaft alignment.

Structure of a Standard Ball Bearing

• Inner and outer rings: Made from high-strength alloy steel. The outer ring is fixed to the housing, while the inner ring is mounted on the rotating shaft. Raceway surfaces are precision-machined.
• Rolling elements (balls): Hardened steel or ceramic balls with extremely high precision in roundness and hardness. They are the primary load-carrying elements and enable smooth rolling motion.
• Cage (retainer): Maintains equal spacing between balls, preventing contact and wear. Typically made from pressed steel, brass, or engineering plastic.
• Seals (optional): Made from rubber or steel, seals retain lubrication inside the bearing and prevent dust, dirt, and moisture from entering.

Standard Bearing Dimensions

To select the correct bearing, technicians rely on key parameters:

• d: Inner diameter (shaft fitting)
• D: Outer diameter (housing fitting)
• B: Width of the bearing
• r: Corner radius

Example: Bearing 6205 typically has dimensions d = 25 mm, D = 52 mm, B = 15 mm.

Common Types of Ball Bearings

Deep groove ball bearings

Simple design, capable of handling radial loads and limited axial loads. Ideal for high-speed and low-noise applications.

Angular contact ball bearings

Designed with offset raceways to handle combined radial and axial loads. Higher contact angles allow greater axial load capacity. Often installed in pairs.

Self-aligning ball bearings

Feature two rows of balls with a spherical outer raceway, allowing slight misalignment between shaft and housing—ideal for long shafts or alignment challenges.

Four-point contact ball bearings

Special design that supports axial loads in both directions using a single bearing, saving installation space.

• Paired bearings: Combinations of two angular contact bearings arranged in different configurations:
• DF (Face-to-face): Handles radial and axial loads in both directions
• DB (Back-to-back): Higher rigidity and stability
• DT (Tandem): Supports axial load in one direction

Applications

Ball bearings are widely used across industries:

• Industrial: Conveyor rollers, electric motors, water pumps, industrial fans, CNC machines
• Household: Ceiling fans, drills, washing machines, bicycles, motorcycles
• High-tech: Robotics, computer hard drives, precision medical devices

Why choose Belota for ball bearings?

• 100% genuine products: Wide range of brands (SKF, NSK, NTN, FAG, etc.)
• Ready stock availability: From standard to specialized models
• Technical expertise: Support for load calculation and product selection
• Competitive pricing: Attractive discounts for distributors and enterprises

Contact Belota through Hotline 0917657946 today to get detailed quotations and optimal solutions for your system.

Conclusion

Choosing the right ball bearing type plays a crucial role in ensuring smooth machine operation and directly impacts production efficiency. Poor-quality bearings can lead to downtime and significant financial losses. If you are looking for high-quality, genuine ball bearings, Belota is a trusted partner you can rely on.