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Title: Bulletin - United States National Museum
Identifier: bulletinunitedst2131957unit (find matches)
Year: 1877 (1870s)
Authors: United States National Museum; Smithsonian Institution; United States. Dept. of the Interior
Subjects: Science
Publisher: Washington : Smithsonian Institution Press, (etc. ); for sale by the Supt. of Docs. , U. S. Govt Print. Off.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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Figure 100.—Model of 1921 Autocar truck, type XXVI-Y. This quarter-scale model represents a vehicle with a 120-inch wheelbase. The rear axle is of the full-floating, double-reduction, gear-driven type, the gear reduction being compounded through bevel and spur gears. This construction allows low reduction without the sacrifice of road clearance. It also reduces the angularity of the propeller shaft, giving straight lines for the transmission of power. All the gears in the rear axle are of heat-treated steel carried on adjust- able, tapered, roller bearings. The complete gear train is mounted on a cover plate bolted to the axle housing. This cover plate and gear train can be removed as a unit from the axle housing for inspection and adjustment purposes. The rear wheels are mounted on adjustable, tapered, roller bearings carried on an extension of the axle housing. By this means the rotating parts of the rear axle carried no part of the weight of the truck, their only function being to trans- mit the power to the rear wheels. The driving axles are of heat-treated alloy steel. The rear tires, of solid rubber, are 36 by 10 inches. The engine and clutch are in one unit, which is carried in the frame by means of 3-point suspension under the seat structure. The engine is a 4-cylinder, 4-cycle, water- cooled unit of 41/4-inch bore and SV^-inch stroke, with a rated horsepower of 28.9. It is equipped with a counterbalanced crankshaft of heat-treated alloy steel mounted on two ball bearings. 142

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1957
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12 August 2015


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