Four-Point Contact Ball Bearings
AMIGO Four-point contact ball bearings are radial single-row angular contact ball bearings designed to support axial loads in both directions and a limited radial load. They are separable, allowing the outer ring with ball and cage assembly to be mounted separately from the two inner ring halves.
- Accommodates axial loads in both directions
- Less axial space
These bearings take up considerably less axial space than double row bearings. - High load carrying capacity
A large number of balls are incorporated, giving the bearing its high load carrying capacity. - Separable design
The split inner ring leads to easier mounting and dismounting of the bearing. - Improved oil flow
- Limited inner ring deformation when subjected to high clamping forces
Four-point contact ball bearings are widely used in various industries. Their availability matches their versatility across numerous applications in a wide range of designs, variants, and sizes. Examples of applications include:
- Aerospace systems
- Robotics and automation
- Precision machinery
- Wind turbines
- Machine tool spindles
- Industrial gearboxes
- Automotive steering systems
- Medical equipment
- Turbines and compressors
- Packaging machinery
Four-Point Contact Ball Bearings - Designs and Variants
AMIGO Explorer Bearings
AMIGO Explorer bearings are designed to accommodate higher load levels and offer extended service life. These bearings are ideal for demanding applications requiring durability and reliability in both radial and axial load conditions.
Bearings with Locating Slots
AMIGO four-point contact ball bearings can be supplied with two locating slots in the outer ring, designated by the suffix N2, and positioned 180° apart. These slots serve two key purposes: they prevent the bearing from turning and ensure precise positioning within the application. The dimensions and tolerances of these locating slots are fully compliant with ISO 20515 standards, ensuring reliability and accuracy in performance.
Four-Point Contact Ball Bearings Size Chart
| Designation | d [mm] | D [mm] | B [mm] |
|---|---|---|---|
| QJ 217 N2MA | 85 | 150 | 28 |
| QJ 317 N2MA | 85 | 180 | 41 |
| QJ 218 N2MA | 90 | 160 | 30 |
| QJ 318 N2MA | 90 | 190 | 43 |
| QJ 219 N2MA | 95 | 170 | 32 |
| QJ 319 N2MA | 95 | 200 | 45 |
| QJ 319 N2PHA/S | 95 | 200 | 45 |
| QJ 220 N2MA | 100 | 180 | 34 |
| QJ 320 N2MA | 100 | 215 | 47 |
| QJ 222 N2MA | 110 | 200 | 35 |
| QJ 322 N2MA | 110 | 240 | 50 |
| QJ 224 N2MA | 120 | 215 | 40 |
| QJ 324 N2MA | 120 | 260 | 55 |
| QJ 226 N2MA | 130 | 230 | 40 |
| QJ 326 N2MA | 130 | 280 | 55 |
| QJ 228 N2MA | 140 | 250 | 42 |
| QJ 328 N2MA | 140 | 300 | 62 |
| QJ 1030 N2MA | 150 | 225 | 45 |
| QJ 230 N2MA | 150 | 270 | 45 |
| QJ 330 N2MA | 150 | 320 | 65 |
| QJ 332 N2MA | 160 | 340 | 68 |
| QJ 234 N2MA | 170 | 310 | 52 |
| QJ 334 N2MA | 170 | 360 | 72 |
| QJ 336 N2MA | 180 | 380 | 75 |
| QJ 1038 N2MA | 190 | 290 | 46 |
| QJ 338 N2MA | 190 | 400 | 75 |
| QJ 240 N2MA | 200 | 360 | 58 |
Recommended Reading
Frequently Asked Questions (FAQs)
Q: How do four-point contact ball bearings differ from other angular contact ball bearings?
A: Four-point contact ball bearings can support axial loads in both directions with a single bearing, whereas other angular contact ball bearings typically require two bearings for this function. This makes four-point bearings more compact and efficient for specific applications.
Q: What are the typical applications of four-point contact ball bearings?
A: These bearings are commonly used in applications such as gearboxes, cranes, wind turbines, and precision machinery where both axial and radial loads are present, and space is limited.
Q: Can four-point contact ball bearings handle radial loads?
A: Yes, while four-point contact ball bearings are primarily designed for axial loads, they can also handle radial loads to a certain extent, making them versatile for various applications.
Q: What is the benefit of using four-point contact ball bearings?
A: The main benefit is their ability to handle axial loads in both directions with a single bearing, reducing the number of components and simplifying the design. They are also compact, making them ideal for space-constrained applications.
Q: How are four-point contact ball bearings constructed?
A: These bearings feature a split inner ring design that allows the outer raceway to accommodate contact at four points. This unique construction enhances load-bearing capabilities for both axial and radial loads.
Q: How should four-point contact ball bearings be mounted?
A: Proper alignment during installation is critical for four-point contact ball bearings. Care must be taken to ensure the bearings are positioned correctly to manage the loads effectively and maintain long-term reliability.
Q: What lubrication options are available for four-point contact ball bearings?
A: Four-point contact ball bearings can be lubricated with grease or oil, depending on the application. Sealed bearings are pre-lubricated and offer low maintenance, while open bearings allow for flexible lubrication options.
Q: How do I choose the right four-point contact ball bearing for my application?
A: The right bearing depends on your load requirements, speed, and the application’s environmental conditions. Consult the manufacturer’s specifications to ensure the correct choice for optimal performance.
Q: Are four-point contact ball bearings suitable for high-speed applications?
A: While they are primarily designed for axial loads, four-point contact ball bearings can operate at moderate to high speeds. However, other bearing types may be better suited for extremely high-speed applications.