Figure 11-1.-Babbitt-lined bearing in which steel shaft revolves.clamped or screwed around the shaft (fig. 11-1). We alsocall it a laminated sleeve bearing.Under favorable conditions the friction in journalbearings is remarkably small. However, when therubbing speed of a journal bearing is very low orextremely high, the friction loss may become excessive.A good example is the railroad car. Railroad cars arenow being fitted with roller bearings to eliminate the“hot box” troubles associated with journal bearings.Heavy-duty bearings have oil circulated around andthrough them. Some have an additional cooling systemthat circulates water around the bearing. Althoughrevolving the steel shaft against babbitt metal producesless friction (and less heat and wear) than steel againstFigure 11-3.-Diagrammatic arrangement of a Kingsburythrust bearing, showing oil film.steel, keeping the parts cool is still a problem. The samecare and lubrication needed to prevent a burned outbearing on your car is needed on all Navy equipment,only more so. Many lives depend on the continuedoperation of Navy equipment.Thrust BearingsThrust bearings are used on rotating shafts, such asthose supporting bevel gears, worm gears, propellers,and fans. They resist axial thrust or force and limit axialFigure 11-2.-Kingsbury pivoted-shoe thrust bearing.11-2
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