Linear Bearing

Linear bearings are used where something needs to be moved along a straight line with high precision in one direction, and if required move back to it's starting position.

Hardness, finish, and conformity of race and rolling elements determine load capacity. The surface finish must be smooth because grinding marks create ridges that prevent conformity between the race and rolling element. Flat race, balls have lower load capacity than rollers. The circular groove has a higher load capacity, but the ball bears on the bottom of the groove, which results in side play. Preloading can damp the vibrations caused due to deflection but this also increases drag friction.

Choices for linear bearing styles include air, flat ball cage, ball spine, ball bushing, needle roller cage, cam follower, crossed roller, guide wheel, hydrostatic, plain or journal, linear motion guide, flat roller cage, and linear roller. Bearing materials for linear motion bearings include bronze, ceramic, graphite, plastic, and stainless steel. Special material features include corrosion resistance, self-lubricating, and rotary motion.

 

Important specifications to consider when selecting linear bearings include the bearing width, length, inside diameter, and dynamic load capacity. The bearing housing can be flanged, none or open, rectangular, and pillow block. The bearing may be open or closed. Features and options for linear bearings include adjustable preload, clean room use, lubrication port, self-aligning, vacuum compatible, and wipers or seals.

Tags:- Linear Motion Ball Bearings, Linear Motion Bearings

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