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Single row spherical roller bearings are adjustable in angle and can compensate misalignments due to the spherical outline of outer and inner ring raceway and the barrel-shaped rolling elements. They absorb very high radial forces as well as axial forces from both sides, but they are not suitable for high speed needs. Single row spherical roller bearings cannot be disassembled and are suitable for use with very high shock loads.

Dimensions and Tolerances

KRW supplies single row spherical roller bearings with normal tolerance (PN) in accordance to DIN 620-2 (Tolerances for roller bearings) and ISO 492 (Radial bearings - Dimensional and geometrical tolerances). All other deviating or special tolerances must be specified with the order.

Rolling Bearing Tolerances

Standards

The dimensions of the single row spherical roller bearings are standardised in DIN 635-1 (Rolling bearings – Radial spherical roller bearings), DIN 616 (Rolling bearings - Dimensions) or ISO 15 (Radial bearings - Boundary dimensions, general plan).

 

Structure of an Spherical Roller Bearings

design of a single row spherical roller bearing

Bearing Design

Single row spherical roller bearings are self-latching radial bearings that cannot be disassembled. They can absorb highest radial forces as well as high axial forces from both directions. Single row spherical roller bearings can be delivered with cylindrical or tapered bore.

 

Bearing Clearance

KRW supplies single row spherical roller bearings in normal clearance (CN) in accordance with DIN 620-4 (Rolling bearing tolerances) and ISO 5753-1 (Rolling bearings - Internal clearance), but they are also available in all clearance classes with restricted clearance or special clearance.

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KRW cages

Cage

By default, KRW single row spherical roller bearings are equipped with a two-piece inner flange guided brass chamber cage (suffix: MB). Other cage designs are available on request or chosen for specific applications and labelled accordingly on the bearing.

 

General Cage Information

compensation of angular misalignments of a single row spherical roller bearing

compensation of angular misalignments of a single row spherical roller bearing

Compensation of Angular Misalignments

Single row spherical roller bearings are suitable for compensation of misalignments between inner and outer bearing rings due to shaft deflections, angular errors and housing deformation. The admissible angular misalignment with static and circulating inner ring is 4°. Deviating angles are available on request or custom-designed.

 

Speed

KRW distinguishes between kinematic limiting speed nG and thermal reference speed nth. The kinematic limiting speed is a practical mechanical limit value and is based on the mechanical fatigue strength of the rolling bearing as a function of its installation situation and lubrication. The limit speed must not be exceeded even under optimum operating conditions without prior consultation with KRW.

The DIN ISO 15312 (Rolling bearings - Thermal speed rating) does not specify a thermal speed rating nth for these bearings.

Admissible Operating Temperatures

The admissible operating temperature of a bearing is limited by cage material, dimensional stability of the bearing components (ball race and rolling elements), as well as lubrication. By default, KRW bearings are stabilised up to 200°C (S1). KRW provides roller bearings for higher operating temperatures on request.

 

General Information to Cage Material

Dimensioning

For dynamically loaded bearings

The service life formula according to ISO 281 L10 = (C/P)p for dynamically loaded bearings requires an equivalent load (P) from constant direction and size. To calculate P, calculation factors and the ratio of axial and radial load are required.

Equivalent Dynamic Bearing Load P

The equivalent bearing service life for the single row spherical roller bearings depends on the ratio Fa/F. The equivalent dynamic bearing load can be determined using the following formula:

Pequivalent dynamic load[kN]
Frdynamic radial force[kN]
Fadynamic axial force[kN]

 

For statically loaded bearings

Dynamic dimensioning loses its validity for bearings rotating at very low speeds (n x dm ≤ 4000 mm/min). The static load safety factor S0 is calculated as follows:

S0static load safety factor[-]
C0static load rating (from bearing chart)[kN]
P0 equivalent static bearing load[kN]
nspeed[min-1]
dmmean bearing diameter [dm = (D+d)/2][mm]

Static load capacity

F0rmax. radial static load[kN]
F0amax. axial static load[kN]

 

Minimum Radial Load

A minimum load is required for the reliable operation of a rolling bearing. If the minimum load is not reached, slippage may occur. The minimum radial load for single row spherical roller bearings is roughly assumed to be 2% of the static load rating C0 of the bearing. If the value falls below this value, please consult KRW Application Technology.

 

 


 

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