. American engineer and railroad journal . rst costand maintenance are less than with the swing motion style; alarge part of the lighter cars also use this style of truck, of alighter construction. Trucks of other than the diamond stylehave been under freight cars, and since the introduction of pressedsteel in car construction several new types have been put on themarket, which will be considered later. Figs. 39, 40 and 41 represent a rigid diamond truck, which canbe considered as a good example of modern practice, the bolstersand springs being omitted, as these will be shown by themselves. Th
. American engineer and railroad journal . rst costand maintenance are less than with the swing motion style; alarge part of the lighter cars also use this style of truck, of alighter construction. Trucks of other than the diamond stylehave been under freight cars, and since the introduction of pressedsteel in car construction several new types have been put on themarket, which will be considered later. Figs. 39, 40 and 41 represent a rigid diamond truck, which canbe considered as a good example of modern practice, the bolstersand springs being omitted, as these will be shown by themselves. The wheels A A are mounted by means of hydraulic pressure onthe axles BB, the journals on the ends of these run in journalbearings CC, which are held in the journal boxes DD by the keysEE. The journal is lubricated by oil or grease held in suspensionby wool or cotton waste, with which the lower part of the journalbox is filled; wooden dust guards FF, which are inserted in a slotin the back of the box, and covers OO on the front prevent dust. Fit. 41. rising from the roadbed from entering the box and causing thejournals to heat. Connecting the journal boxes on each side of the truck are thearchbars HH. the inverted archbars II and the tie bars JJ, allof which are secured to each box by two H-inch journal boxbolts KK. These bolts, as well as all the other bolts of thetruck, should be provided with double nuts or some other meansof securing the nuts against working off the bolts, which theyare very liable to do on account of the constant jar. The in- verted archbar is turned up at its ends, forming lugs againstwhich the upper archbar is fitted. Archbars vary more or less incross-section, and attempts to have them standardized by theMaster Car Builders Association have not been successful. Thewidth of 4 inches is generally adopted for 60,000-pound cars, butthe thicknesses vary; those shown can be considered good prac-tice. The wheel base or distance between centers of axles isgeneral
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
