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NACHI America
Spherical Roller Bearings

Spherical Roller Bearings

Product catalog summary

Spherical Roller Bearings Overview
Spherical Roller Bearings are designed to handle misalignment due to mounting errors or shaft deflection, suitable for radial and axial loads. NACHI offers various designs and materials for different applications and sizes.

Design and Configuration
These bearings can manage radial and axial loads, with a recommendation that axial loads should not exceed 0.6 times the radial load. For oscillating or high-speed applications, consulting NACHI engineers is advised. Bearings should be loaded above 0.02 Cr to avoid damage from sliding motion.

Lubrication and Heat Stabilization
Lubrication holes and grooves are included in the outer ring for lubricant feeding. Bearings are heat-stabilized for use up to 200°C with minimal dimensional changes.

Misalignment and Mounting
The permissible misalignment angle is about 2° under general conditions. Bearings with tapered bores require an interference fit on the shaft, with radial internal clearance reduction as a fit measure.

Tolerance Values
Detailed tables provide tolerance values for inner and outer rings, crucial for ensuring proper fit and function.

Key Recommendations

Ensure axial loads do not exceed 0.6 times the radial load.
Consult NACHI for high-speed or oscillating load applications.
Maintain a load greater than 0.02 Cr to prevent bearing damage.
Use proper techniques for mounting bearings with tapered bores.

Spherical Roller Bearings Specifications

This section details specifications for spherical roller bearings, focusing on dimensions, load ratings, and lubrication capabilities. Bearings are categorized by bore diameter, ranging from 160mm to 340mm, available in cylindrical and tapered bore designs.

Specifications

Boundary Dimensions: Lists dimensions for each bearing, including diameter (d), outer diameter (D), width (B), and corner radius (r).
Load Ratings: Basic dynamic load rating (Cr) and basic static load rating (Cor) indicate maximum load capacity.
Limiting Speed: Specifies maximum speed for grease and oil lubrication for each bearing type.

Lubrication and Design Features

Oil Holes and Grooves: Equipped with oil holes and grooves (W33) for lubrication.
Dynamic and Static Load Calculations: Provides formulas for calculating dynamic (Pr) and static (Por) equivalent radial loads, using factors X, Y, Y1, Y2, and e.

Additional Details

Abutment and Fillet Dimensions: Includes specifications for lubrication holes, grooves, and abutment and fillet dimensions.
Mass and Axial Load Factor: Provides mass and axial load factor for each bearing, critical for determining suitability for specific applications.

Conclusion

This document serves as a comprehensive guide for selecting the appropriate spherical roller bearing based on specific application requirements, considering factors such as load capacity, speed, and lubrication needs.

Spherical Roller Thrust Bearings Overview

This section provides detailed specifications and performance data for spherical roller thrust bearings, including boundary dimensions, load ratings, and limiting speeds for various models.

Specifications

Boundary Dimensions: Lists dimensions such as bore diameter (d), outside diameter (D), and width (T) for different models.
Load Ratings: Basic dynamic load rating (Ca) and basic static load rating (Coa) indicate load capacity.
Limiting Speeds: Specifies maximum speeds for grease and oil lubrication, highlighting operational limits.

Load Calculations

Dynamic Equivalent Axial Load: Calculated as Pa = Fa + 1.2Fr, where Fa is the axial load and Fr is the radial load.
Static Equivalent Axial Load: Calculated as Poa = Fa + 2.7Fr, with Fr/Fa ≤ 0.55.

Additional Notes

For heavy load applications, the shaft washer rib must be adequately supported by a large enough da.
Bore diameters range from 60mm to 530mm, accommodating various application needs.

Reference Dimensions

Includes abutment and fillet dimensions, spacer dimensions, and reference mass for each model.

This document serves as a comprehensive guide for selecting the appropriate spherical roller thrust bearings based on specific application requirements, ensuring optimal performance and reliability.

Catalog excerpts

pherical Roller Beari SPHERICAL ROLLER SPHERICAL ROLLER THRUST BEARINGS

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SPHERICAL ROLLER BEARINGS- 1 SPHERICAL ROLLER THRUST BEARINGS-29

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Spherical Roller Bearings Spherical Roller Hearings are parlicularly suitable fur Hpijlicatiuns where misalignment can arise from errar in mounting or from shaft deflection. NACHI Spherical Holler Bearings are manufac- tured in a number of design and material configu- rations depending on the type oí application and See the table below lor the roller, guide ring and cage design for KACI11 Spherical Roller Hearings. They can sustain radial and axial loads. (1) For high axial load ¡ippliradtions. the axial load l'';¡ musi nul exceed o.» oí llie rudial load IT. li llie axial load exceeds il.fì l'r,...

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Spherical Roller Bearings Lubrication holes and groove The outer ring of Spherical Roller Bearings arc often made with lubrication holes and a groove for feeding lubricant. The outer ring may also be configured with oil holes only depending on fitting, mounting or service conditions. Heat-stabilized bearings NACHI Spherical Roller iiearmgs are subjected to a beat-stabilization treatment as standard. They can be used al operating temperature of up to 200°C with minimal dimensional changes occur- Lubrication holes and groove

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Mounting bearings with tapered bore Mounting bearings wiili a tapered bore requires some experience and technique. Bearings with tapered bore are always mounted with an interference fit on the shaft. To measure Ihe amount of inter lereiice fit on the shaft. Ihe axial displacement of Ihe inner ring or the reduction of radial internal clearance due to the interference fit can be used. Generally, the measurement of reduction ¡ti r;idial internal clear- ance is a more reliable method than measurement of the axial displacement of the inner ring. Maximum permissible misalignment angle is about 2" under...

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Tolerance Values for Radial Bearings

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Tolerance Values for Radial Bearings

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Tolerances for Tapered Bores

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Internal Clearance Radial Internal Clearance of Spherical Roller Bearings with Cylindrical Bore (ISO) JI* Radial Internal Clearance of Spherical Roller Bearings with Tapered Bore (ISO)

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Spherical Roller Bearings

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Spherical Roller Bearings

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Spherical Roller Bearings

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Spherical Roller Bearings

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Spherical Roller Bearings

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Spherical Roller Bearings

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Spherical Roller Bearings Cylindrical bore Tapered bore Cylindrical bore Tapered bore load rating load rating Note: Suffix K or K30 means tapered bore (1/12 or 1/30)

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Spherical Roller Thrust Bearings Aligning angle Maximum permissible misalignment angle, is about 2' under general service conditions. If the aligning advantages of this bearing type are to be realized, care must be taken lo provide clearance for parts Minimum axial load To prevent damage caused by sliding motion between the rollers and raceway, spherical roller thrust bearings must be subjected to a load more ihan the minimum load. Fa min. Because there are many sliding surfaces in E type Spherical Roller Thru si Bearings (cage-to-guide- sleeve and roller-cnds-to-rilj),oil lubricant (not grease)...

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Spherical Roller Thrust Bearings

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Spherical Roller Thrust Bearings

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NACHI-FUJIKOSHI CORP. Tokyo Head Office : Shiodome Sumitomo Bldg. 1 Toyama Head Office : 1-1-1 Fu] ikostii-Hon machi Overseas Sales Companies i Ufi L:http J/www. nachi -lu j ikoshi. co. i p INDIANA BRANCH WEST COAST BRANCH MIAMI BRANCH - LATIN AMERICA DIV. ATLANTA OFFICE • NACHI EUROPE GmbH SOUTH GERMANY OFFICE SPAIN BRANCH CZECH BRANCH^ VIETNAM OFFICE • P.T.NACHI INDONESIA NACHI (SHANGHAI) CO.,LTD. Ytoong Industry ZOTIG258. Fengmao Rd. Malu Town. JiaOing. Shanghai 201 BOI. CHINA • NACHI-FUJIKOSHI CORP. ^THAILAND REPRESEr^TAlWE OFFICE Overseas Manufacturing Companies • • NACHI BRASIL LTDA. MANILA...

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Spherical Roller Bearings

Spherical Roller Bearings

Catalog excerpts

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