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Category
3308 ZZ
Double row angular contact ball bearings are a specialized type of rolling bearing characterized by having two rows of steel balls arranged between the inner and outer ring raceways, with the raceways offset relative to each other along the bearing axis. This design causes the contact line between the balls and raceways to form an angle (Contact Angle) with the radial plane of the bearing. The existence of this contact angle is key to enabling these bearings to simultaneously support radial and axial loads. Compared to single row angular contact ball bearings, the double row design offers significantly higher load-carrying capacity (especially axial loads) and rigidity.
Double Row Angular Contact Ball Bearing
| ISO | 3308 ZZ | |
| GOST | 3056308 ZZ | |
| Bore diameter | d | 40 mm |
| Outside diameter | D | 90 mm |
| Width | B | 36.5 mm |
| Basic dynamic load rating | C | 33.7 kN |
| Basic static load rating | C0 | 25.8 kN |
| Reference speed | 3000 r/min | |
| Limiting speed | 4000 r/min | |
| Mass bearing | 0.95 kg | |
Characteristics of Double Row Angular Contact Ball Bearings
- High Load Capacity:The two rows of balls substantially increase both the radial and axial (particularly bi-directional axial) load capacity of the bearing.
- High Rigidity:The double row structure provides superior rigidity and stability under overturning moments or combined loads, offering greater resistance to deformation.
- Bi-Directional Axial Load Support:This is the most prominent advantage of double row angular contact ball bearings. A single bearing can support axial loads from both directions (e.g., left and right) while maintaining high accuracy and rigidity. There's no need to pair single row bearings to achieve bi-directional support.
- High Running Accuracy:Manufactured to high precision standards, ensuring smooth and precise rotational performance.
- Compactness:Despite having two rows of balls, their design is generally more compact than using a combination of two back-to-back or face-to-face paired single row bearings, saving mounting space.
- Simplified Installation:As an integral unit, installation is simpler than paired single row bearings and ensures a predetermined clearance or preload condition.
- Preload Adjustment:Many standard double row angular contact bearings are supplied with an optimized preload (light or medium) for the best balance of rigidity, running accuracy, and service life.
Classification of Double Row Angular Contact Ball Bearings
- Double row angular contact ball bearings are primarily classified based on their contact angle and design features:
- By Contact Angle:
- 15° Contact Angle:Emphasis on high-speed capability; suitable for moderate axial loads but high-speed requirements.
- 25° Contact Angle (Most Common):Offers a balanced combination of radial/axial load capacity, rigidity, and speed; the most widely used type.
- 30°/40° Contact Angle:Focuses on high axial load capacity and rigidity; suitable for predominantly axial loads at relatively lower speeds.
- By Structural Design:
- Standard Type:Solid outer ring and separable inner ring(s) (often with flanges or ribs). Most common design (e.g., 3300, 3200 series).
- Sealed/Shielded Type:Equipped with contact rubber seals (RS/2RS) or non-contact shields (ZZ/2Z) for environments requiring protection against dust, moisture, or lubricant retention.
- Flanged Outer Ring:Outer ring features a flange for easy axial positioning and simplified installation.
- Tapered Bore:Inner ring has a tapered bore for clearance/preload adjustment by axial displacement.
- High Load/Special Designs:Such as double-split inner or outer rings (e.g., some 3200 series designs), optimized for contact stress distribution to further enhance axial load capacity.
- By Size Series:Classified according to ISO dimension series standards (e.g., 32, 33 series), indicating different width to diameter ratios.
- By Contact Angle:
Applications of Double Row Angular Contact Ball Bearings
Leveraging their high rigidity, precision, and ability to handle bidirectional thrust, double row angular contact ball bearings are extensively used in applications requiring support for combined loads (especially bidirectional axial forces and overturning moments) and demanding high rotational accuracy. Examples include:
- Machine Tool Spindles:Bearings for spindles in lathes, milling machines, grinding machines, etc., where they are one of the most prevalent applications.
- Gearboxes:Support for output shafts in planetary gear reducers and industrial gearboxes (often requiring axial thrust and tilting moment support).
- Industrial Pumps:Shaft support in centrifugal pumps, screw pumps, etc., handling radial and bidirectional axial loads.
- Construction/Agricultural Machinery:Drive shafts, slew rings.
- Printing Machinery:Cylinder bearings, requiring high precision and smooth operation.
- Plastic & Rubber Machinery:Screw support in extruders, roll bearings in calenders/mixers.
- Fans/Blowers:Rotor support in high-speed fans.
- Automotive:Limited high-performance applications (e.g., high-end clutch release bearings), but less common than single-row or four-point-contact bearings due to space constraints.
- Robot Joints.
Note: We offer a wide range of double row angular contact ball bearings. Please contact us to select the optimal bearing for your specific application requirements (load magnitude & direction, speed, accuracy requirements, mounting space, environmental conditions, etc.).
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