Figure 11-4.-The seven basic types of antifrictional hearings.movement. They are used chiefly on heavy machinery,your roller skates or bicycle wheels spin freely. If anysuch as Kingsbury thrust bearings used in heavymarine-propelling machinery (figs. 11-2 and 11-3). Thebase of the housing holds an oil bath, and the rotation ofthe shaft continually distributes the oil. The bearingconsists of a thrust collar on the propeller shaft and twoor more stationary thrust shoes on either side of thecollar. Thrust is transmitted from the collar through theshoes to the gear housing and the ship’s structure towhich the gear housing is bolted.ANTIFRICTIONAL OR ROLLERAND BALL BEARINGSYou have hadbearings since youfirst-hand acquaintance with ballwere a child. They are what madeof the little steel balls came out and were lost, your rollerskates screeched and groaned.Antifrictional balls or rollers are made of hard,highly polished steel. Typical bearings consist of twohardened steel rings (called races), the hardened steelballs or rollers, and a separator. The motion occursbetween the race surfaces and the rolling elements.There are seven basic types of antifrictional bearings(fig. 11-4):1.2.3.Radial ball bearingsCylindrical roller bearingsTapered roller bearings11-3
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