NEW FORCE sealed spherical roller bearings

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Basic information

ZKL "NEW FORCE" Łożyska baryłkowe uszczelnione

"NEW FORCE" Double-row spherical roller bearings

by ZKL Group are popular and widespread across all engineering branches. They consist of two rows of spherical rollers with a common spherical track in the outer ring. This structure allows for mutual tipping of the bearing rings. Thus they can simultaneously transfer considerable radial and axial loads in both directions. The bearings are made with a cylindrical and a tapered bore. These bearings are suitable for applications with high loads acting on them where tipping has to be ensures so as the bearings may eliminate movement and misalignment of shafts. Sealed double-row spherical roller bearings by ZKL Group have the same inside structure as their open counterparts.

Advantages of Sealed Spherical Roller Bearings by ZKL:

Reduced Maintenance Need

· Sealed double-row spherical roller bearings by ZKL are ready for immediate use. They are lubricated by the manufacturer with high-standard grease. Bearing contamination is prevented by contact seal on both sides of the bearing. The lubricant needs neither replenishment nor change and so the bearings are virtually maintenance-free in many applications.

Increased Availability and Reliability

·Maintenance of clean bearing inside is necessary for its long-term function - service life - in the machine. Even very small particles can negatively affect the life of the bearing. Use of sealed double-row spherical roller bearings can successfully prevent penetration of impermissible humidity and impurities.

Reduced Lubricant Consumption

· The contact seals on both sides of the bearing assure that the bearing will always keep sufficient grease. In many cases the life of the lubricant is longer than the life of the bearing (or application). For that reason the bearings do not need further lubrication.

Applications of Sealed Spherical Roller Bearings

· Sealed spherical roller bearings are mainly used in applications with increased contamination and humidity of the surroundings. Where outer seal cannot be applied or in the case of strong contamination "multi-barrier" seal should be used.

Environment-Friendly

· Users of sealed double-row spherical roller bearings can reduce their costs of purchase and disposal of grease. Another important factor is that these bearings are able to reduce environmental impact of the machine during its operation time.

Sealing Materials:

The sealing material type depends on the bearing size. The following materials have been used for the seals:

· NBR (up to 90°C)

· HNBR (up to 110°C)

· FKM (up to 200°C)

Lubricant and work temperatures limitations

TM - Grease up to 110 °C

TN - Grease up to 150 °C

TH - Grease up to 200 °C

For example:

Bearings with suffi x 2RSN TM should not be used at operation temperatures above +90 deg. C (194 deg. F).

Bearings with suffi x 2RSH TM or 2RSF TM should not be used at operation temperatures above +110 deg. C (230 deg. F).

Identification:

IMPORTANT: NEW FORCE sealed spherical roller bearing goes 40% of the ZKL open construction sealed spherical roller bearing.

Lubrication

Sealed double-row spherical roller bearings in the product table below feature a perimeter groove in the outer race with three lubrication holes as a standard (W33). When lubricating the bearing the lubricant must be replenished slowly until the new lubricant begins to go out under the seal. High pressures during lubrication must be prevented to avoid damage to the seal.

Grease Quantity for Re-Lubrication

The required quantity of grease for re-lubrication is calculated with the help of the following formula:

Q = 0.0015 × D × B

Where:

Q – quantity of grease for replenishment [g]

D – outer diameter of bearing [mm]

B – bearing width [mm]

Rules of No-Maintenance Operation

· Operation for 8 hours/day (not always in full use)

· Normal operation conditions

· Shaft in horizontal position

The bearing may be considered low-maintenance if:

· The speed is 50% lower than the limit speed

· Operation temperature does not exceed 70 °C (160 °F)

As for the possibility of use of sealed double-row spherical roller bearings at higher temperatures please contact the technical department of ZKL.

The material of the sealings

2RSN Acrylonitrile-butadiene rubber (NBR), sealing on both sides with the option of re-lubrication via the outer race

2RSH Hydrogenated acrylonitrile-butadiene rubber (HNBR), sealing on both sides with the option of re-lubrication via the outer race

2RSF Fluor-elastomere (FKM), sealing on both sides with the option of re-lubrication via the outer race

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Catalogues, publications

NEW FORCE sealed shperical roller bearings (2.96 MB)View

Manufacturers ZKL,