Popular science monthly . m-driven. Last year twenty-two percent of the trucks Hsted were worm-driven, thus showing that the popularityof this form of drive has increased. To understand the reason for this greatincrease, one must first know the causefor any form of gearing for transferringthe power of the truck motor to the rearwheels in order to make the truck average gasoline motor of the truckof today revolves at the rate of fromI,GOO to 2,000 revolutions per is out of the question for the rearwheels to revolve at any such speed be-cause they would simply spin around andn
Popular science monthly . m-driven. Last year twenty-two percent of the trucks Hsted were worm-driven, thus showing that the popularityof this form of drive has increased. To understand the reason for this greatincrease, one must first know the causefor any form of gearing for transferringthe power of the truck motor to the rearwheels in order to make the truck average gasoline motor of the truckof today revolves at the rate of fromI,GOO to 2,000 revolutions per is out of the question for the rearwheels to revolve at any such speed be-cause they would simply spin around andnot secure enough traction between thetires and the ground to make the vehiclemove. The necessary reduction betweenthe speed of the motor and that of thewheels under varying conditions of roadsis secured through some form of change-speed mechanism and the form of gearingused between the motor-shaft extendedand the axle of the driving-wheels. The latter type of gearing may bedivided into four main classes as shown ---?-,?. ?::;t Fig. 2. Worm drive. The bevel-pinionand wheel are substituted by a worm-gear and worm-wheel in the accompanying illustration, al-though there are some few other typesused on special vehicles. The four mostcommon types arc: i. Bevel drive; 2,Worm drive; 3, Double-chain drive, and4, Internal-gear drive. In the bevel drive the power of themotor is transmitted through the clutch r:r^S
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1872
