Common sense of single row angular touch ball bearings and double row angular touch ball bearings
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**Common Sense About Single-Row and Double-Row Angular Contact Ball Bearings**
Home > Bearing Knowledge > Common Sense About Single-Row and Double-Row Angular Contact Ball Bearings
Source: Bearing Network | Date: January 30, 2014
Angular contact ball bearings are a type of rolling bearing that can handle both radial and axial loads. They are commonly used in high-speed applications due to their ability to operate stably at higher speeds. These bearings are particularly useful when combined with other components to manage complex load conditions.
Single-row angular contact ball bearings are designed to support axial loads in one direction only. However, they can also accommodate pure radial loads. Due to the angle between the rolling elements and the raceway, an internal axial force is generated when subjected to radial loads. This means that single-row bearings are often used in pairs to balance the forces and ensure smooth operation.
There are three main configurations for single-row angular contact ball bearings:
1. **Separable Bearings (S70000 Series):** These bearings have no lock on the outer ring, allowing them to be separated from the inner ring, cage, and balls. They are typically used in miniature bearings (less than 10mm) for applications such as gyroscopes and micro-motors, where dynamic balance, noise, and stability are critical.
2. **Non-Separable Bearings:** These bearings feature a locked raceway, preventing the inner and outer rings from being separated. They come in different contact angles:
- **40° Contact Angle:** Suitable for heavy axial loads.
- **25° Contact Angle:** Ideal for precision spindles.
- **15° Contact Angle:** Used in larger precision bearings.
3. **Paired Angular Contact Bearings:** These are manufactured with specific preloads and matched for optimal performance. When installed, the clearance is eliminated, and the bearing operates under preload, increasing rigidity. There are three common pairing methods:
- **Back-to-Back (DB):** Provides better resistance to overturning moments and allows for two-way axial loading.
- **Face-to-Face (DF):** Offers good rigidity but less resistance to overturning moments compared to DB.
- **In-Line (DT):** Allows for multiple bearings in series but only supports axial load in one direction.
Some single-row bearings are designed for easy pairing, enabling back-to-back, face-to-face, or inline configurations. The CA code indicates a moderate axial clearance, while GA, GB, and GC codes represent different levels of pre-interference after pairing.
Double-row angular contact ball bearings are capable of handling combined radial and axial loads while limiting axial displacement in both directions. Compared to thrust ball bearings, they offer higher speed limits, better rigidity, and the ability to withstand overturning moments. With a contact angle of 32°, they are widely used in automotive front wheel hubs.
There are four common types of double-row angular contact ball bearings:
1. **Type A (Outer Diameter ≤ 90mm):** No ball gap, suitable for bi-directional axial loads. Lightweight nylon cages reduce heat generation.
2. **Type A (Outer Diameter > 90mm):** One side has a ball gap and uses steel or brass cages.
3. **Type E (Reinforced Design):** Features a ball gap and holds more balls, increasing load capacity.
4. **Sealed Bearings:** Available with dust covers or seals, filled with rust-proof lithium grease. Operating temperature range is typically -30°C to +110°C.
When installing double-row angular contact bearings, it's important to avoid applying axial loads to the side with the ball gap, even though the bearing can handle bi-directional axial loads.
**Related Bearing Knowledge:**
- Rolling bearing markings
- Machining processes of bearing parts
- Sealing techniques for bearings
- Static and dynamic sealing in SKF and NSK bearings
- Single-row and double-row cylindrical roller bearings
- Oil film handling in NSK bearings
- New applications of self-lubricating bearings
This article was originally published on China Bearing Network. For more information, visit [http://www.chinabearing.net](http://www.chinabearing.net).
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