Common sense of single row angular touch ball bearings and double row angular touch ball bearings
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**Common Knowledge About Single-Row and Double-Row Angular Contact Ball Bearings**
Home > Bearing Knowledge > Common Knowledge About Single-Row and Double-Row Angular Contact Ball Bearings
Source: Bearing Network | Date: January 30, 2014
Angular contact ball bearings are widely used in various mechanical systems due to their ability to handle both radial and axial loads. These bearings are particularly useful in high-speed applications where stability and precision are crucial.
Single-row angular contact ball bearings consist of an inner ring, outer ring, steel balls, and a cage. They are designed to support combined radial and axial loads, but they can only handle axial loads in one direction. When subjected to pure radial loads, the contact angle causes internal axial forces, which is why these bearings are often used in pairs for better performance and stability.
There are three main types of single-row angular contact ball bearings:
1. **Non-separable Bearings**: These have a locked raceway on the outer ring, preventing the inner and outer rings from being separated. They come in different contact angles (e.g., 15°, 25°, and 40°), each suited for specific applications. For example, 40° contact angles are ideal for handling large axial loads, while 15° or 25° angles are commonly used in precision spindle applications.
2. **Separable Bearings**: Also known as S70000 series, these bearings allow the inner and outer rings to be separated, making them suitable for small-scale applications such as gyro rotors and micro-motors where dynamic balance and noise control are essential.
3. **Paired Angular Contact Bearings**: These are pre-assembled by manufacturers with specific preload settings. They are used in pairs to eliminate clearance and increase rigidity. There are three common mounting configurations:
- **Back-to-back (DB)**: Offers excellent resistance to overturning moments and allows for bidirectional axial load.
- **Face-to-face (DF)**: Less rigid than DB but still capable of handling axial loads in both directions.
- **In-line (DT)**: Suitable for axial loads in one direction, often used in combination with another bearing to manage shaft displacement.
Some single-row bearings are specially designed for easy pairing, allowing users to choose between back-to-back, face-to-face, or in-line configurations. Additional codes like CA or CB indicate the axial clearance level, offering flexibility based on application needs.
Double-row angular contact ball bearings are similar in function but offer greater load capacity and rigidity. They can handle both radial and axial loads simultaneously, making them ideal for applications requiring precise axial positioning. With a contact angle of 32°, they are commonly used in automotive wheel hubs and other high-performance systems.
These bearings also come in several variations, including A-type, E-type, and sealed versions. The A-type is suitable for smaller bearings without a ball gap, while the E-type features a reinforced design that allows more balls, increasing load capacity. Sealed versions are filled with lithium-based grease and can operate within a wide temperature range (-30°C to +110°C).
When installing double-row angular contact bearings, it's important to ensure that the primary axial load does not pass through the side with the ball gap, as this could lead to premature wear or failure.
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