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Spherical Roller Thrust Bearings

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Spherical roller thrust bearings have a large number of asymmetrical rollers with good fit to the raceways of the shaft washer and housing ring. They are suitable for accommodating large loads at relatively high speeds. In addition to high axial loads, these bearings can also accommodate certain radial forces. The spherical raceway of the housing ring can compensate misalignments between the shaft and the housing. Spherical roller thrust bearings are dismountable, which allows separate mounting of shaft units (shaft washers with a cage and rolling elements) and housing rings.

Due to the internal structure of these bearings, oil lubrication is necessary, except for operation at very low speeds.

Boundary dimensions

The boundary dimensions of spherical roller thrust bearings given in the dimension tables comply with the ISO 104 international dimension plan.

Designation

The designation of bearings with the basic design is given in the dimension tables. The difference from the basic design is designated by additional marks.

Cages

Spherical roller thrust bearings have brass cages, guided using a steel sleeve on a shaft washer (designation M), or have brass cages, guided on a shaft washer.
The J design spherical roller thrust bearings have a sheet steel cage guided on a shaft washer. Spherical roller thrust bearings with a sheet steel cage (J) are interchangeable with bearings with a solid brass cage. If a spherical roller thrust bearing with a brass cage, arranged so that the shaft washer rests on the shaft against the face of the steel sleeve that guides the cage, is to be replaced by the J design bearing, a spacer needs to be inserted between the shaft washer and the original shaft mounting, as shown in the picture.

Precision

Spherical roller thrust bearings are normally manufactured with normal precision grade P0 (the P0 mark is not designated). The manufacturing of bearings with a higher precision grade needs to be discussed in advance.

Permissible Misalignment

The spherical raceway of the housing ring of spherical roller thrust bearings allows, under normal operating conditions (Pa ≤ 0.1 Ca), a misalignment from the centre without disrupting the correct function of the bearing by the values given in the table.

Bearing Type Permissible Misalignment
292 2°
293 2°30´
294 3°
Arrangement Structure

The connection dimensions given in the dimension tables are suitable for bearings where the load Pa ≤ 0.1 Ca. At higher loads, it is appropriate to support the bearing rings across the entire end face, i.e. da = d1 and Da = D1.

Axial Equivalent Dynamic and Static Load

Axial Equivalent Dynamic Load

Depending on the effect of wobbling of the bearing arrangement and its elimination by mutual movement of rings and in compliance with the condition Fr ≤ 0.55.Fa, the following applies:

Pa = Fa + 1.2.Fr – if the wobbling affects the load distribution in the bearing
Pa = 0.88.(Fa + 1.2.Fr) – if the wobbling does not affect the load distribution in the bearing

Where:
Pa – equivalent dynamic bearing load (N)
Fa – axial load (N)
Fr – radial load (N)

If Fr > 0.55.Fa, the calculation of the arrangement should be consulted with R&D KINEX.

Axial Equivalent Static Load

For axial load, provided that Fr ≤ 0.55.Fa, the following applies:

P0a = Fa + 2.7.Fr

Where:
P0a – equivalent static bearing load (N)
Fa – axial load (N)
Fr – radial load (N)

If Fr > 0.55.Fa, the calculation of the arrangement should be consulted with R&D KINEX.

Minimum Axial Load

The operation of spherical roller thrust bearings poses a risk of the rolling elements slipping between the raceways of the rings due to centrifugal forces and friction in the lubricant and consequent damage to the rolling elements or raceways. As a result, a certain minimum load must be applied to the bearing. The minimum load will be calculated with sufficient accuracy using the following formula:

Famin = 0.00125.C0a

Where:
Famin – minimum load
C0a – static load capacity

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