6905 Bearing 25x42x9mm - Deep Groove Ball Bearing for Industrial Machinery & Electric Motors

Most small and medium-sized motors use rolling bearings. Large and medium-sized motors also use rolling bearings. Ball bearings (deep groove ball bearings) are used for the bearings at both ends of the small motor. Medium-sized motors use roller bearings at the load end (generally used for high load conditions), and ball bearings at the non-load end (but there are also opposite cases, such as 1050kW motors). Rolling bearings are lubricated with grease, but they are also lubricated with oil.

Deep groove ball bearings are the most frequently used type of bearings in motors. It is mainly used to bear radial load, but when the radial clearance of the bearing is increased, it has a certain performance of angular contact ball bearing and can bear combined radial and axial loads. It can also be used to bear pure axial load when the rotational speed is high and the thrust ball bearing is not suitable. Deep groove ball bearings are widely used in electric motors mainly because of their quiet running properties, as well as other characteristics such as low friction, low lubrication pressure and good high-speed performance. Deep groove ball bearings can bear radial load and bidirectional axial load at the same time. They can be used as both floating and fixed bearings. It is possible to use two floating bearings (drive end and non-drive end) in the motor, but each floating bearing should be axially preloaded with a spring to reduce vibration and noise.

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