Flanged mounted bearings are used when the axis of the shaft is perpendicular to the bearing mounting surface. They have a sealed bearing built in that is pre-assembled into a flanged housing. The housing contains a precision ground surface perpendicular to the bearing axis and two, three or four mounting holes, depending on the style. Bearings can be removed and removed, making bolted roller bearing replacement easier and faster than traditional slew bearings that must be press-fitted into the chock. Flanged mounted bearings can also handle heavy loads, protecting the shaft from deflection that could cause vibration or other damage. Two-bolt flange mount bearings are diamond-shaped with two holes for mounting bolts on each side of the bearing. A line passing through the axis of the mounting hole forms a line passing through the axis of the bearing. Three Bolt Roller Bearing Flange Mount Bearings have three mounting holes arranged radially at 120 degrees to each other along the bearing axis, or on a triangular flange that is offset from the bearing axis. Four-bolt roller bearing flange mount bearings have four mounting holes that are radially distributed along the bearing axis. Four-bolt flanged bearings typically have round or square housings. Bearings used in flange mounts are called insert bearings. Flange mounts can contain many different bearing types. The correct type of selection depends on the desired application and operating specifications. Ball bearings have a ball as the rolling element. They are used to provide smooth, low friction motion in rotary applications. The construction consists of an inner and outer ring, multiple balls, usually a cage or a ball separator. Rolling bearings have rollers as rolling elements. They are used to provide smooth, low-friction motion in rotating applications and have a higher radial load capacity than ball bearings. The construction includes an inner and outer ring, multiple rollers, and usually a cage or roller separator. There are three main types of rolling bearings. Cylindrical roller bearings have high radial load capacity and moderate thrust loads. Spherical roller bearings are the most commonly used roller bearings in flange mounted bearings. They contain two rows of friction-reducing barrel rollers between an outer ring with spherical raceways and an inner ring consisting of two sloping raceways. Tapered roller bearings contain an inner ring, an outer ring and multiple tapered rollers. Separately, the inner and outer bearing rings are also tapered, similar to the conical sections. Due to their large surface area, tapered roller bearings can withstand heavy axial and radial loads. Needle roller bearings have needle rollers as rolling elements. They are similar to cylindrical roller bearings, but with a smaller diameter to length ratio. By controlling the circumferential clearance between the rollers or needles, the rolling elements remain parallel to the axis of the shaft. Needle roller bearings are designed for radial load applications requiring a low profile. Plain and sleeve bearings (also called bushing or journal bearings) are used to limit, guide or reduce friction in rotary or linear applications. They work by sliding instead of the rolling action used by ball, roller and needle bearings. Lubrication is essential for the operation of plain bearings to avoid overheating due to friction. Shaft Fixing Methods Set Screws - Bearings secured with set screws are secured to the shaft by setscrews located in the inner race, i.e. the bearing has set screws used to secure the inner race to the shaft. Locking ring The bearing has a locknut to secure the inner ring to the shaft. A bearing without a method of securing has no means for securing to the shaft.
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