1 May 2012
Electrical switching & drive systems & components
BMG supplies the QM Blue Brute range of spherical roller housed units. Typical applications include mining operations, steel industries, oil and gas, automotive, agriculture and power generation. This range is also used in treatment facilities, saw mills, food and beverage, as well as pulp and paper.
“The QMSN series, which is designed for efficient performance and extended service life in demanding environments, is manufactured with cast steel housings that have three times the tensile strength of cast iron housings,” says Rouff Essop, bearings division manager, BMG. “This is an important advantage in applications where there are heavy loads and vibration. The robustness of these spherical roller housed units means that the bearing can be replaced into the same housing many times, which offers substantial cost savings.” There are three standard sealing options available – the triple lip nitrile rubber series, the triple lip viton rubber series and teflon labyrinth seals.
Triple lip nitrile rubber units have a standard sealing arrangement to offer maximum protection for most conditions, including moisture and dirt. The seal has a light to medium contact pressure, which allows excess grease to purge under the lips, preventing the housing from becoming overpacked with grease. Overpacking is a common problem which results in the bearing running hot. The steel backing plate of the seal is completely covered in rubber to improve corrosion resistance.
Triple lip viton rubber units have the same design as the standard rubber seal, but the viton material improves chemical and temperature resistance.
The teflon seal consists of a teflon ring that floats between two steel plates and ensures highly efficient sealing. The material is impervious to most chemicals and because of its low coefficient of friction, these units have a high speed capability.
External urethane seal covers, with triple lip nitrile or viton contact seals, can be snapped onto locating holes on the face of the housings for extra protection. The cavity between the cover and the housing can be filled with grease to act as a further seal if necessary.
The standard locking method for these units is the eccentric collar. Unlike eccentric collars on ball bearing housed units, this QMSN collar has a shallow ramp when the collar is rotated to the inner ring. This ensures adequate grip, even in applications where there is vibration. In addition, the angle of the axial contact area between the collar and inner ring is larger than normal. These two features prevent the locking mechanism from loosening. Alternative locking methods include a grub screw lock, a tapered sleeve lock using a standard adaptor sleeve arrangement and the new V lock method which encompasses a double taper locking method.
Spare components for this series include bearings, seals and clamping nuts.
QMSN Blue Brute spherical roller housed units are dimensionally interchangeable with other leading brands and standard split housings of the SN range. QM components include a full range of imperial dimensioned housed units which are interchangeable with other American produced units. This range is available nationally from BMG’s branch network of over 100 outlets. A technical advisory and 24 hour support service is offered.
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