. Steam engines, a thorough and practical presentation of modern steam engine practice . reciprocating parts and the centrifugal force of the crank and theconnecting rod. The crank can be readily balanced by making itextend as far on one side of the shaft as it does on the other, but thepiston- and the connecting rod are more difficult to balance. Theeffect of jarring can be greatly reduced, if the crank be balanced andthe endwise throw made to come in line with the foundation, whichshould be heavy enough to absorb the vibration transmitted. In ahorizontal engine this endwise throw not being i
. Steam engines, a thorough and practical presentation of modern steam engine practice . reciprocating parts and the centrifugal force of the crank and theconnecting rod. The crank can be readily balanced by making itextend as far on one side of the shaft as it does on the other, but thepiston- and the connecting rod are more difficult to balance. Theeffect of jarring can be greatly reduced, if the crank be balanced andthe endwise throw made to come in line with the foundation, whichshould be heavy enough to absorb the vibration transmitted. In ahorizontal engine this endwise throw not being in line with thefoundation will cause vibration in the engine itself. In machines that can be anchored down to a massive foundation,a state of defective balance only results in straining the parts and STEAM ENGINES 35 causing needless wear and friction at the crank-shaft bearings andelsewhere, and in communicating some tremor to the ground. Theproblem of balancing is much more of consequence in locomotive andmarine engines. To sum up the general advantages of the vertical engmes: they. Fig. 25. Buckeye Vertical Cross-Compound Engine have less cylinder wear, they take up less floor space, and they canbe better balanced. In addition to these there are certain advantageswhich vertical engines have for certain kinds of work. Disadvantages of Vertical Type. The pressure on the crank pinis greater during the down stroke than during the up stroke, because 36 STEAM ENGINES during the down stroke the weight of the reciprocating parts is addedto the steam pressure, and during the up stroke this weight is sub-tracted. Another difficulty is that in large engines the various parts areon such different levels that they require considerable requires more attendants and is sometimes the cause for neglectof the The foundations for vertical engines need to be deeperthan those for horizontal engines, yet they do not need to be as broad. Buckeye Vertical Cross=Compound Type.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectsteamen, bookyear1920
