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TIMKEN
Matched Bearing Assemblies

Matched Bearing Assemblies

Product catalog summary

Introduction
Timken Metric Tapered Roller Bearings are engineered for applications needing higher load capacity and axial location in both directions. These assemblies are pre-set with a standard axial clearance, known as Bench End Play (BEP), and comply with ISO 355 standards. Key benefits include simplified mounting, high load capacity, and precise settings for enhanced productivity.

Mounting Arrangements
Timken provides matched bearing assemblies in direct (DF) and indirect (DB) mounting configurations, both supporting axial loads in both directions. Direct mounting involves a face-to-face arrangement, while indirect mounting uses a back-to-back setup.

Internal Clearance and Part Numbering
The axial clearance is factory set, with standard values listed in the bearing table. Non-standard clearances are indicated with a "C" in the part number. Each assembly is serialized for identification, and mixing components with different serial numbers is discouraged.

Fitting Practices
Standard axial clearances are suitable for light-duty fitting practices. Special fitting practices may be necessary for specific applications, such as those involving tubular shafts or non-ferrous materials. Timken provides guidelines for shaft and housing fits based on operating conditions.

Matched Bearing Assemblies
These assemblies are used in various industrial applications, including gear drives, transmissions, and cranes. They consist of two single-row bearings with matched spacers, designed for easy installation and optimal performance.

Data Tables
The document includes detailed tables with specifications for various bearing assemblies, including dimensions, load ratings, and fitting tolerances. These tables provide critical information for selecting the appropriate bearing assembly for specific applications.

Specifications
The document lists various part numbers with corresponding specifications such as bore diameter, outer diameter, width, and axial clearance. It also includes dynamic radial load ratings and weight for each bearing assembly.

Direct Mounting
This section details the specifications for bearings designed for direct mounting. Key parameters include bore size, outer diameter, width, and load ratings. The section also provides information on shaft and housing dimensions, including maximum fillet radii and backing shoulder diameters.

Indirect Mounting
Similar to the direct mounting section, this part covers bearings suitable for indirect mounting. It includes detailed specifications for each part number, focusing on dimensions, load ratings, and assembly weight.

Key Parameters

Bore Diameter (d): Ranges from 75 mm to 360 mm.
Outer Diameter (D): Varies significantly across different models.
Width (T): Provided for each bearing, indicating the overall width.
Dynamic Radial Load Ratings: Expressed in Newtons, indicating the load capacity.
Weight: Given in kilograms, indicating the mass of each bearing assembly.

Recommendations
For additional series or specific assembly requirements not listed, consultation with a Timken engineer is advised.

Procedures and Standards
The document references the ISO life-calculation method for determining the L10 life of bearings, based on 1 million revolutions. It also highlights the importance of clearing maximum fillet radii by bearing corners.

Company Information
Timken is recognized as a global leader in enhancing machinery reliability and performance across diverse markets, known for its expertise in high-performance steel and mechanical power transmission products.

Catalog excerpts

r r To clear 2.0 max. ﬁllet radius. R To clear 0.3 max. ﬁllet radius. r TIMKEN® METRIC TAPERED ROLLER BEARINGS MATCHED BEARING ASSEMBLIES

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TIMKEN® METRIC TAPERED ROLLER BEARINGS - MATCHED BEARING ASSEMBLIES INDEX r r To clear 2.0 max. ﬁllet radius. TIMKEN® METRIC TAPERED ROLLER BEARINGS - MATCHED BEARING ASSEMBLIES R To clear 0.3 max. ﬁllet radi

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TIMKEN® METRIC TAPERED ROLLER BEARINGS - MATCHED BEARING ASSEMBLIES INTRODUCTION TIMKEN MATCHED BEARING ASSEMBLIES Matched bearing assemblies are used in applications: • hat require higher load carrying capacity than can be T achieved with a single-row tapered roller bearing; or • Where the shaft must be located axially in both directions with a specific axial clearance or preload. The standard range of assemblies included in the product tables are specified with a market standard axial clearance value that is referred to as Bench End Play (BEP). Application specific axial clearance values are...

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TIMKEN® METRIC TAPERED ROLLER BEARINGS - MATCHED BEARING ASSEMBLIES MOUNTING ARRANGEMENTS DIRECT MOUNTING MOUNTING ARANGEMENTS: Timken can supply standard matched bearing assemblies in both the direct (DF) and indirect (DB) mounting arrangements to meet the application needs. Both types can accommodate axial loads in both directions. This arrangement consists of: This arrangement consists of: • Two single-row bearings, with abutting back-facing inner-rings • An outer-ring spacer with lubricating holes • An outer-ring spacer with lubricating holes • A solid inner-ring spacer TIMKEN® METRIC TAPERED...

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TIMKEN® METRIC TAPERED ROLLER BEARINGS - MATCHED BEARING ASSEMBLIES PART NUMBERING SYSTEM DIRECT MOUNTING BEARING AXIAL CLEARANCE The internal axial clearance is factory set for each assembly. The indicated axial clearance values are valid for general application conditions. The mean values (μm) are shown in the bearing table and are manufactured to a tolerance +/- 25 μm. For example the matched bearing assembly 30228 DF will have a factory set axial clearance with a mean of 270 μm, The actual clearance will therefore lie in the range of 245 μm to 295 μm. When a non-standard internal axial clearance...

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TIMKEN® METRIC TAPERED ROLLER BEARINGS - MATCHED BEARING ASSEMBLIES FITTING PRACTICE DIRECT MOUNTINGTABLES INNER RING – Industrial Equipment Classes K and N (Metric) Inner Ring Bore Ground Seat Standard axial clearances shown in bearing table are appropriate for light duty fitting practice. A special axial clearance value may be needed for applications using Timken preferred, or special fitting practices. Special fitting practices may include applications with tubular shafts, with shaft/housing made of non-ferrous materials, with rotating housing/stationary shaft, with unground bearing seats,...

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TIMKEN® METRIC TAPERED ROLLER BEARINGS - MATCHED BEARING ASSEMBLIES FITTING PRACTICE TABLES DIRECT MOUNTING OUTER RING – Industrial Equipment Classes K and N (Metric) Outer Ring O.D. Range These charts are guidelines for specifying shaft and housing fits related to particular operating conditions. Deviation from nominal (maximum) bearing O.D. and resultant fit. Stationary Outer Ring Clamped Adjustable Outer Ring Resultant Seat Fit Deviation TIMKEN® METRIC TAPERED ROLLER BEARINGS - MATCHED BEARING ASSEMBLIES

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TIMKEN® METRIC TAPERED ROLLER BEARINGS - MATCHED BEARING ASSEMBLIES DIRECT MOUNTING Bearing Dimensions Load Ratings Part Number TIMKEN® METRIC TAPERED ROLLER BEARINGS

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TIMKEN® METRIC TAPERED ROLLER BEARINGS - MATCHED BEARING ASSEMBLIES DIRECT MOUNTING Shaft Dimensions Max. Shaft Backing Fillet Radius Shoulder Dia. (2) R db Housing Dimensions Max. housing Max. Backing Fillet Radius Shoulder Dia. (2) r Da Bearing Assembly Weight Based on 1 x 106 revolutions L10 life, for the ISO life-calculation method. C1(2) is the double-row radial value. (2) These maximum fillet radii will be cleared by the bearing corners. Additional series may exist. If you do not see the assembly you are looking for, consult your Timken engineer for more information. TIMKEN® METRIC TAPERED...

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TIMKEN® METRIC TAPERED ROLLER BEARINGS - MATCHED BEARING ASSEMBLIES DIRECT MOUNTING Bearing Dimensions Load Ratings Part Number TIMKEN® METRIC TAPERED ROLLER BEARINGS - MATCHED BEARING ASSEMBLIES

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TIMKEN® METRIC TAPERED ROLLER BEARINGS - MATCHED BEARING ASSEMBLIES DIRECT MOUNTING Bearing Dimensions Load Ratings Part Number TIMKEN® METRIC TAPERED ROLLER BEARINGS - MATCHED BEARING ASSEMBLIES

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TIMKEN® METRIC TAPERED ROLLER BEARINGS - MATCHED BEARING ASSEMBLIES INDIRECT MOUNTING Bearing Dimensions Part Number Load Ratings Factors e TIMKEN® METRIC TAPERED ROLLER BEARINGS - MATCHED BEARING ASSEMBLIES

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Matched Bearing Assemblies

Matched Bearing Assemblies

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