BALL BEARINGS Wide inner ring bearings with concentric collars GC-RRB series: These bearings are relubricated with spherical outside diameters, nylon retainers and shroud seals. The metal shroud maintains tight seal contact against the inner ring and shields the rubber seals from damage due to dirt or fiber wrap. The concentric collar is locked to the shaft by two setscrews, located 120째 apart, which are mated with threaded holes in the collar and drilled holes in the bearing inner ring. (Fig. 40)
Fig. 36 RR-Series
Fig. 37 RA-RR-Series
Fig. 38 Tri-ply Series
Fig. 39 External self-aligning series
Fig. 40 GC-RRB series
Fig. 41 Pillow block
Ball Bearing Housed Units Ball bearing housed units are available in a wide variety of types and sizes to accommodate a complete range of operating conditions. They generally have cast iron housings and are designed for mounting on straight shafts with a slip fit. The self-locking collar and the setscrew inner bearing designs provide easy mounting. Bolt holes in housings take standard bolts for assembling these units to machinery frames. Several series are also available with the concentric-locking collar. Most of these units are self-aligning. There are several basic types of housed units available: pillow blocks, flanged cartridges, flangette units, cylindrical cartridges and take-up units. The type required is generally determined by its application and mounting requirements. Within the basic type selected, numerous variations allow for load factors, shaft sizes, mounting surface dimensions, base-to-shaft center line heights and lubrication requirements. Pillow blocks: These are the most commonly used type of mounted units, designed to provide shaft support where the mounting surface is parallel to the shaft axis. The bolt holes are usually slotted for adjustment during mounting (Fig. 41). Pillow blocks are supplied in both standard and heavy duty series. Pressed steel and rubber pillow blocks are also available for light duty applications. Flanged cartridges: These housed units are used where a shaft passes through the machine frame at a right angle. A four-bolt mounting is the most common; however, where the mounting area is restricted, three and two-bolt versions are available. A pilotedflanged cartridge, also available, provides additional mounting accuracy and support. (Fig. 42)
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Fig. 42 Flanged cartridge
Flanged cartridges are supplied in both standard and heavy duty series. Iron and rubber flanged cartridges are also available. A complete line of flangette units, pressed steel flanged cartridges, provides an economical solution to light duty applications. Two-, three- and four-bolt mountings are available along with a relubricating version.
INDUSTRIAL BEARING MAINTENANCE MANUAL
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