. Material handling cyclopedia; a reference book covering definitions, descriptions, illustrations and methods of use of material handling machines employed in industry . Figs. 80 and 81 spur gears are in general use, while for excessively highreductions, the planetary gear reducer or a combination FLIGHTS 453 of worm and spur gears will usually give better resultsthan a single worm drive. The worm is generally made of steel and the wheel ofeither cast iron or phosphor bronze. The teeth must bekept thoroughly lubricated, preferably by running thegears in an oil bath. This calls for an oil tigh
. Material handling cyclopedia; a reference book covering definitions, descriptions, illustrations and methods of use of material handling machines employed in industry . Figs. 80 and 81 spur gears are in general use, while for excessively highreductions, the planetary gear reducer or a combination FLIGHTS 453 of worm and spur gears will usually give better resultsthan a single worm drive. The worm is generally made of steel and the wheel ofeither cast iron or phosphor bronze. The teeth must bekept thoroughly lubricated, preferably by running thegears in an oil bath. This calls for an oil tight housing,and also makes it advisable to place the worm below thewheel when possible. Thrust bearings should alwaysbe provided for both worm and wheel to take care of theend thrust developed. The planetary or internal gear reducer (Fig. 82) works up-keep and renewals will in the long run make it pooreconomy to use this type of drive unless the feature ofslipping when overloaded is essential to prevent damage. Fig. 82 on the well-known principle of a stationary internal gearmeshing, with idler pinions carried by a revolving spideror ring, the pinions in turn engaging a gear carried bythe driving shaft concentrically with the internal gear. Bycompounding two or more of these mechanisms, verylarge reductions in speed can be obtained. The gearingshould be enclosed in an oil-tight housing, the shaft of thereducer being direct connected to the motor shaft by aflexible coupling. Planetary gear reducers are accuratelyconstructed, built of high grade material, and are prob-ably the most efficient, noiseless, and satisfactory drivesthat can be used on conveying machinery. They take upa minimum of space and are adaptable to almost any con-ditions of speed and load. Their use in elevator and con-veyor drives is fast increasing. Reducers are sometimes used in combination with worm
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Keywords: ., bo, bookcentury1900, bookdecade1920, booksubjecthoistingmachinery
