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SKF - Rolling Bearings

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6 Needle roller bearings<br />

Bearing data<br />

Needle roller and cage assemblies<br />

Dimension<br />

standards<br />

Tolerances<br />

ISO 3030 when F w ≤ 100 mm, as far as standardized<br />

• rollers: ISO 3096 Grade 2 (grade G2)<br />

––<br />

tolerance of each gauge 2 μm<br />

––<br />

standard and special gauges († table 5, page 707)<br />

––<br />

specific gauge to be stated when ordering<br />

• U: ISO 3030 as far as standardized (–0,2/–0,8 mm)<br />

For additional<br />

information<br />

(† page 132)<br />

Operating<br />

clearance<br />

Range of C2 to Normal if:<br />

• fitted with standard gauge rollers († table 5, page 707)<br />

• recommended raceway tolerances († table 10, page 709) applied<br />

• normal operating conditions<br />

Internal clearance Specific ranges: († table 12, page 709)<br />

Misalignment<br />

≈ 1 minute of arc<br />

The permissible angular misalignment between the shaft and the housing<br />

depends on the size and internal design of the bearing, the radial<br />

internal clearance in operation and the forces and moments acting …<br />

Friction,<br />

starting torque,<br />

power loss<br />

Defect<br />

frequencies<br />

Frictional moment, starting torque, and power loss can be calculated as<br />

specified under Friction († page 97), or using the tools available online<br />

at skf.com/bearingcalculator.<br />

Defect frequencies can be calculated using the tools available online at<br />

skf.com/bearingcalculator.<br />

700

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