Side flange-mounted bearings – EF type

The integrated side flange on the housing permits the bearing to be installed directly on the nameplate. The surfaces of the housing are optimally finned for excellent, natural cooling characteristics. The EF type is especially suitable for electric machines which do not have their own bearing foundations or the alignment work that goes with them. However, the nameplates must be torsion-resistant and able to absorb the bearing loads. Significantly shorter bearing clearances, and therefore more rigid rotor constructions in comparison to pedestal bearings. Self-adjusting, floating labyrinth seals are standard fitted to seal the shafts on the concealed side of the machine. We recommend using chamber seals in cases where there is an increased circulation of lubricant, or due to unique specifications. Access through the interior of the machine must be provided for to enable assemble and adjustment of these seals. Thanks to the numerous advantages it offers, the EF type is the most popular design for electrical machines. Side flange-mounted bearings of the type EF are less suitable for machines with sensitive rotordynamic characteristics and/or rotors with supercritical speeds. In this case, the ER, EG, and EM housing versions offer more advantageous conditions.


Side flange-mounted bearings – EF type

Lower noise levels in comparison to rolling bearings and resistant to loads caused by shocks thanks to low material stresses

Maintenance-free or low-maintenance and easy to install

Lubricant film dampens vibrations, impacts, and noise

Resistant to penetration of dust and shocks

Slide bearings require a small radial installation space and are structurally adaptable (can be integrated as component)

Slide bearings are suitable for very high speeds

Slide bearings exhibit practically no wear during fully hydrodynamic continuous operation and with hydrostatic bearings

Slide bearings are most cost-effective than rolling bearings at large dimensions

Technical data

EF bearing
Finned side flange-mounted bearing acc. to DIN 31693 / ISO 11687-2
9 … 28, for shafts Ø 80 … 355 mm
35 … 45, for shafts Ø 300 … 560 mm (600 mm)
Self-lubricating (loose oil ring, fixed oil ring) or external lubrication
Cooling system:
Natural cooling, water cooling, or external cooling
Bore design:
Various bore designs as required, e.g. cylindrical bore, two-lobe bore, four-lobe bore, or radial tilting pad
Electric insulation, lubrication circulation system, hydrostatic jacking
Temperature monitoring with PT100, prepped for vibration/speed sensors


Other products

Online Store

In our online store we offer selected spare parts for our E-bearings and our ELCO couplings.

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Slide bearings, EG / ER type

Pedestal bearing housings, i.e., housings intended to be positioned on foundation constructions, are widely used in general mechanical engineering applications.

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Slide bearings, EM type

Slide bearings of the the EM type make it possible to provide very large access areas to the interior of the machine and the bearings for installation purposes – an extraordinary advantage when assembling the machine and performing maintenance work. This housing shape serves as a very suitable basis for a wide range of expansion stages in demanding drive concepts in particular.

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Turbo gear units, couplings, and slide bearings for the field of energy production. RENK drive technology guarantees high system availability at all times.

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