Precision Tapered Roller Bearing 31313 Split Design For Engineering Machinery

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

1. 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.
2. 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.
3. 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

1. 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.
2. Clearance Adjustment: After installation, adjust the axial clearance to 0.05-0.12mm (standard clearance of CN group) to ensure stable operation.
3. 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.