Product Catalogue

BEM maintenance-free ball bearing units are filled with high-quality lithium grease and of long service life, suitable for application in the seal type bearings. Excellent seal design help effectively prevent grease leakage as well as outside dust and moisture from entering the bearing.

The rotating shaft will drive the grease to circulate in the seal cavity of the bearing, thus realizes the sufficient lubrication. The lubrication effect can be kept for quite a long time, so no updating of grease is needed.

BEM maintenance-free ball bearing units have the following advantages:

1) Such bearings have been filled with sufficient qualified grease at the manufacturing stage, so re-lubrication is no more needed once put into operation. This will save the user time and maintenance costs.

2) Since no re-lubrication equipment such as pipe is needed, a more compact design is available.

3) Sealed type design eliminates the possibility of grease.

BEM re-lubricating ball bearing unit can be normally re-lubricated in case that the left or right inclination is up to 2°. The oil orifice filled with grease can usually affect the immobility of bearing structure, however, BEM ball bearing unit can have this adverse effect to the lowest level by arranging the oil orifice to a appropriate position. The re-lubricated groove design can also minimize the bad impact on the housing strength.

In case of indoor normal operation, the use effect of BEM maintenance-free ball bearing units turns out to be quite satisfactory, but in the following cases, the re-lubricating ball bearing units are preferred:

1) If the bearing temperature exceeds 100 ° C;

2) In case of dusty work environment, and the shielded ball bearing unit is not allowed due to space limitations;

3) If the ball bearing unit is constantly exposed to the splash of water or other liquids, but the shielded ball bearing unit is not allowed due to space limitations;

4)The impact of noise shall be considered if the rotational speed is relatively high.

Rubber seal ring combined with shield: the shield is fixed on the inner ring and rotates with the same while the rubber ring is fixed on the outer ring, so that the sealing lip and the inner ring can form a standard torque contact seal which can effectively prevent external dirt, dust, moisture, and other foreign matters from entering the bearing, and stop the grease inside the bearing from leaking, thus the bearing can maintain a perfect performance even in severe working conditions.

Three-lip sealing type: metal shield strictly sealed with three slender rubber lips, with a larger touch sealing torque, suitable for agricultural machinery in especially harsh environment.

Shield bearing unit: BEM shielded ball bearing unit is composed of a standard ball bearing unit and an external shield. Special consideration is given in the design of dust control measures.

Bearing and housing are designed with sealing mechanism, so satisfactory use effect is possible even in the environment where there are covered with dust and liquids such as flour mills, steel mills, foundries, galvanized factories, chemical plants, etc. They are also applicable in outdoor conditions where dust and rainfall are inevitable, such as heavy machinery in the fields of construction and transportation.

The bearing can be fixed on the shaft by tightening the set screw in the inner ring. BEM ball bearing units are provided with excellent locking function, which will not get loosed subject to strong vibration and shock.

Self-aligning: BEM ball bearing unit is self-aligning, as the outer and inner surfaces of the housing are both spherical. Any axial tilt due to improper operation or wrong fit can be appropriately adjusted.

High load capacity: ball bearing units are provided with internal structure the same as that of BEM62 and 63 series bearings, able to carry radial and axial load.

BEM ball bearing unit is the integrated unit of bearing and housing, which has been filled with the appropriate lithium grease at the manufacturing stage, thus can be installed at any time. Simple operation check will be enough after installation.

Accurate Fit of Housing: For easy assembly of ball bearing unit and flanged ball bearing unit, a joint pin is designed on the housing for spare use.

Lubrication: All BEM ball bearing units are filled with grease while been manufactured so re-lubrication is not necessary prior to use. If used correctly, there will be a significant increase in bearing life. Note: Excessive lubrication is a major cause of bearing failure. If you are unsure about bearing requirements, please take careful consideration before applying re-lubrication.

Solid Lubricant: For applications where relubrication is inconvenient or the surrounding environment is so polluted that bearing may fail during operation, BEM introduces you with several bearings that use solid lubricant. Filling the entire bearing space with chemical polymer can make the bearing maintenance-free or lubrication-free. A good example of solid lubricant application is the food processing machinery where relubrication will cause pollution due to accumulation, or complex industrial applications where grease is more difficult to apply. Solid lubricants shall be applied at ambient temperature.

Selection of Bearings

Standard bearing units: the inner and outer rings and steel balls are all made of GCr15 bearing steel treated with vacuum degassing. GCr15 bearing steel contains high carbon and chromium, thus able to effectively resist deformation and fatigue so as to ensure an extremely long service life.

Based on the clean and corrosion-resistant characteristics, high-performance stainless steel bearings are also provided with high precision and wear-resistant characteristics comparable with high-carbon chromium steel bearings. AISI440C (9Cr18Mo or 9Cr18) is usually adopted as the material of rings and rolling elements, but AISI304 or AISI316 (0Cr18Ni9) is also applicable in case of special applications. AISI304 or AISI 316 is often used as the framework material of cage and ring. The accuracy is P0 and above according to ISO standard, and the vibration level is Z1 or above.

They have different size compared with the SUC series. SUC3R rings are made of special stainless steel, thus applicable in special harsh chemical environment where 9Cr18 stainless steel can not be applied. For application analysis, please contact BEM.

BEM standard cast iron housing is manufactured using high-strength cast iron, and its rigidity design is known as the highest in the bearing industry, which enables the housing to carry strong vibration and impact loads.

Ductile cast iron has been widely applied in severe working conditions because of its particularly good mechanical properties. Ductile cast iron is provided with tensile strength (ductility) 2.5 times that of gray cast iron, thus able to reduce the fatigue damage from bending.

Using stainless steel bearing is usually the most effective way to solve the corrosion problem. Stainless steel housing is free of problems such as flaking, cracks, deformation, fading like other anti-corrosion materials, and abrasions will not be generated, thus able to carry very high radial load.

BEM heat-resistant plastic housings are corrosion resistant and affordable, able to be used in conjunction with any bearing unit described in this catalog. Such housing (white) is made of glass fiber reinforced PBT resin material, with high resistance to chemical corrosion, pressure resistance up to 115MPa, and extremely excellent mechanical, thermal, electrical performance.

The bearing of a BEM bearing unit is replaceable. If the bearing fails, a new one can be mounted in the housing.

Although BEM unit has no high requirements on the shaft accuracy, but it is better to have the shaft away from bending and flaws.