Self-Aligning Bearings
Self-aligning bearings have a double-row structure on one side and a spherical outer ring surface on the other side. They are used in cases where the axis may not perfectly align with the housing or when the axis has some deviation. A self-aligning bearing is designed with a spherical common raceway on the outer ring, allowing the shaft to have some misalignment. Thus, these bearings are commonly used in situations where misalignment might occur due to installation errors, deflection, or shaft misalignment.
Self-Aligning Ball Bearings
In places where the load-bearing capacity of self-aligning bearings is insufficient, self-aligning ball bearings with the "E" suffix are used. These bearings have an improved load-bearing capacity compared to standard types due to their optimized internal design. Therefore, type E bearings can endure higher loads, and if the load remains constant (compared to the non-E type), they will have a longer lifespan. Generally, type E bearings come with a specialized fiber cage.
Types of Self-Aligning Bearings Based on Design and Size
1. Self-aligning bearings without a felt seal
2. Self-aligning bearings with felt seals on both sides
3. High bushing self-aligning bearings
Main Types of Self-Aligning Bearings
The primary types of these bearings are produced with inner rings that are cylindrical or tapered with a 1:12 taper angle. For the tapered bore type (often referred to as "K"), suitable adapters (bush with threaded bolt and lock washer) are also manufactured, allowing easy and quick mounting of the bearing on a smooth or stepped shaft.
Self-Aligning Bearing Suffix Codes
Common suffixes for these types of bearings include:
- E+K+TN9: EKTN9
- E+M: EM
- E+TN9: ETN9
- K+M: KM
- K+TN9: KTN9
- C3: Radial clearance greater than normal
- E: Optimized internal bearing design
- K: Tapered bore with a 1:12 taper angle
- M: Bearing cage made of brass
- 2RS: Bearings with rubber seals on both sides
installation of Self-Aligning Bearings
Installation of self-aligning bearings with tapered bore always requires proper interference on the shaft, adapter sleeve, or output sleeve. To measure the required fit degree, the reduction of radial internal clearance of the bearing inner ring or the axial displacement of the inner ring on the adapter or output sleeve can be used.
Conclusion
Self-aligning bearings are versatile components used in various mechanical applications to accommodate misalignment and promote efficient load distribution. They come in different designs and sizes to cater to specific requirements. Proper installation and handling are essential to ensure the bearings' optimal performance and longevity.
