. Material handling cyclopedia; a reference book covering definitions, descriptions, illustrations and methods of use of material handling machines employed in industry . 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
. Material handling cyclopedia; a reference book covering definitions, descriptions, illustrations and methods of use of material handling machines employed in industry . 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. Fig. 83 gears to obtain very high reductions of speed, the arrange-ment illustrated (Fig. 83) being designed for a reductionof 850 to 1. Friction gearing is made in both the spur (Fig. 84)and bevel (Fig. 8S) types. The driving pinion is usuallymade of fibre or straw board, and the driven wheel ofcast iron, as this combination has a high coefficient offriction and has proved itself fairly satisfactory and dur-able in service. The driven wheel should never be madeof fibre, for if an excessive load causes the gears to slip,the driver revolves under pressure against the stationarydriven wheel, and if the latter were made of a soft mate-rial, flat spots would be rapidly worn on its face. Friction gearing has a very limited field of applicationto conveyor work, as it is not as efficient, reliable ordurable as tooth gearing. Although cheaper in first cost,
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Keywords: ., bo, bookcentury1900, bookdecade1920, booksubjecthoistingmachinery
