31313 Tapered Roller Bearing Optimized Raceways Rollers Boost Fatigue Life
Tapered roller bearing 31313 is a high-performance mechanical component, mainly used to bear the combined action of radial load and unidirectional axial load. The following is its detailed product description:
I. Basic Parameters
- Dimensions: Inner diameter 65mm, outer diameter 140mm, total width 36mm, inner ring width 33mm, outer ring width 23mm, weight approximately 2.37kg.
- Speed: Limiting speed 4800r/min (data from SKF), reference speed 3600r/min. The actual operating speed should be adjusted according to lubrication conditions and installation accuracy.
- Precision Class: Default to Class P0 (general grade), suitable for general industrial applications. Higher precision (e.g., Class P6) can be customized for special needs.
II. Structural Features
- Split Design: The inner ring, outer ring, and roller assembly are separable, facilitating installation and maintenance, and suitable for scenarios requiring frequent disassembly and assembly.
- Tapered Raceway and Rollers: The generatrix of rollers and raceways adopts an optimized logarithmic curve crown design (patented technology), which effectively disperses edge stress, increases fatigue life by more than 12%, with a basic dynamic load rating of 185.8kN and a basic static load rating of 218.6kN.
- Contact Angle Characteristics: With a contact angle of 28°48'39", it can bear both radial load (C_r=163-203kN) and axial load (C_0r=188-228kN). It needs to be used in pairs to balance axial force.
III. Materials and Manufacturing
- Material: High-carbon chromium bearing steel (GCr15) is used, subjected to quenching and tempering treatment, with a hardness of HRC58-62, featuring high strength and wear resistance.
- Manufacturing Standards: Compliant with international standards such as GB/T 297-94 and DIN ISO 355. Some manufacturers offer upgraded products meeting SKF Explorer performance class.
IV. Application Fields
- Engineering Machinery: Transmission shaft systems of crushers and mining machinery, bearing high impact loads.
- Automotive Industry: Main reducers of drive axles in heavy-duty trucks, adapting to heavy-load and high-speed working conditions.
- Industrial Equipment: Transmission systems requiring both radial and axial load bearing, such as submersible electric pumps, marine pumps, and disc mills.
V. Installation and Maintenance
- Installation Methods:
- Pressure Method: Use a hydraulic press or sleeve for uniform pressure application; avoid direct knocking.
- Temperature Difference Method: Heating temperature ≤100℃, freezing temperature ≥-50℃ to prevent changes in material properties.
- Hydraulic Method: Assisted installation by high-pressure oil, suitable for interference fit occasions.
- Clearance Adjustment: After installation, adjust the axial clearance to 0.05-0.12mm (standard clearance of CN group) to ensure stable operation.
- Lubrication Requirements: Lithium-based grease (NLGI Grade 2) or ISO VG 46 lubricating oil is recommended, with an operating temperature range of -30℃ to +120℃.
VI. Performance Advantages
- High Load-Carrying Capacity: The optimized structural design increases its dynamic load by 12.13% compared with traditional models, suitable for heavy-load applications.
- Long Service Life: The logarithmic curve crown technology reduces stress concentration, extending the service life by more than 20% compared with linear designs.
- Reliability: The split structure facilitates wear inspection; combined with high-precision machining, it can operate stably in harsh environments.
Bearing No | Dimensions (mm) | Load Rating (KN) | Mass |
d | D | T | B | C | R min | r min | C | C0 | kg |
31305 | 25 | 62 | 18.25 | 17 | 13 | 1.5 | 1.5 | 40.7 | 46.1 | 0.262 |
31306 | 30 | 72 | 20.75 | 19 | 14 | 1.5 | 1.5 | 52.0 | 60.0 | 0.389 |
31307 | 35 | 80 | 22.75 | 21 | 15 | 2.0 | 1.5 | 66.0 | 77.0 | 0.508 |
31308 | 40 | 90 | 25.25 | 23 | 17 | 2.0 | 1.5 | 81.0 | 96.0 | 0.722 |
31309 | 45 | 100 | 27.25 | 25 | 18 | 2.0 | 1.5 | 96.0 | 114.0 | 0.950 |
31310 | 50 | 110 | 29.25 | 27 | 19 | 2.5 | 2.0 | 108.0 | 128.0 | 1.230 |
31311 | 55 | 120 | 31.50 | 29 | 21 | 2.5 | 2.0 | 130.0 | 158.0 | 1.560 |
31312 | 60 | 130 | 33.50 | 31 | 22 | 3.0 | 2.5 | 145.4 | 176.8 | 1.920 |
31313 | 65 | 140 | 36.00 | 33 | 23 | 3.0 | 2.5 | 165.7 | 202.6 | 2.390 |
31314 | 70 | 150 | 38.00 | 35 | 25 | 3.0 | 2.5 | 186.9 | 231.0 | 2.870 |
31315 | 75 | 160 | 40.00 | 37 | 26 | 3.0 | 2.5 | 222.0 | 266.0 | 3.470 |
31316 | 80 | 180 | 42.50 | 39 | 27 | 3.0 | 2.5 | 236.0 | 282.0 | 4.120 |
31317 | 85 | 180 | 44.50 | 41 | 28 | 4.0 | 3.0 | 263.0 | 317.0 | 4.810 |
31318 | 90 | 190 | 46.50 | 43 | 30 | 4.0 | 3.0 | 282.0 | 336.0 | 5.600 |