Roller bearings typically have a higher radial loading capacity than ball bearings, however they also usually have a lower thrust loading capacity. They use rolling elements which are cylindrical in shape as opposed to a ball, giving a larger surface contact area which aids the greater loading capacity as it reduces the concentration of internal loads. If the bearing is loaded at an angle as opposed to directly radially, they will fail very quickly.
Contact surface is generally rectangular when load is applied.
Higher rotational torque than for ball bearings, but rigidity is also higher.
Higher load rating than ball bearings.
Support heavy radial loads.
Support limited axial loads.
Lower speed ability than ball bearings due to the increased friction.
Types of Roller Bearings
Cylindrical roller bearings
Low-friction, high-radial load capacity, and high speed capacity.
Point of contact between the bearing and the race is a line, load is distributed over a larger area and allows the bearing to handle a greater load.
Applications like conveyor-belt rollers.
Needle roller bearings
Elongated cylindrical rolling elements with small diameters.
Only radial loads.
Used in applications where radial space is limited.
Generate high amounts of friction.
Used at low speeds and oscillation motions.
Roller thrust bearings
Handle high thrust loads.
Typically found in gearsets used for car transmissions between gears or between the housing and rotating shafts.
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