. A text book of physics, for the use of students of science and engineering . XXXIX STEAM ENGINE 505 Action in the steam engine.—The action in a steam engine maybe understood by reference to the outline diagram in Fig. 463. Thecylinder A has a piston B which is urged to and fro in the cylinder bythe action of the steam pressure. The piston is connected by apiston rod C to a crosshead D, which is guided by part of the frameH so as to travel in a straight line. The crosshead is connected bya connecting rod E to a crank F which is fixed to a revolving crankshaft G. The reciprocating motion of th
. A text book of physics, for the use of students of science and engineering . XXXIX STEAM ENGINE 505 Action in the steam engine.—The action in a steam engine maybe understood by reference to the outline diagram in Fig. 463. Thecylinder A has a piston B which is urged to and fro in the cylinder bythe action of the steam pressure. The piston is connected by apiston rod C to a crosshead D, which is guided by part of the frameH so as to travel in a straight line. The crosshead is connected bya connecting rod E to a crank F which is fixed to a revolving crankshaft G. The reciprocating motion of the piston is thus convertedinto motion of rotation of the crank shaft. Steam is brought from the boiler into a steam chest K through apipe L, and enters the cylinder through ports M and N. A thirdport P permits the discharge of the steam after it lias done workon the piston. These ports are opened and closed at the proper. Fig. 463.—Outline diagram of a steam engine. instants by a valve Q,. which is reciprocated by means of an eccentricS, or small crank, fixed to the crank shaft; S is connected to thevalve by the eccentric rod R and a valve rod. As shown in Fig. 463, the valve has been drawn towards the rightand has uncovered the steam port M ; steam is thus flowing into theleft-hand end of the cylinder, and is urging the piston towardsthe right. At the same time, the cavity in the valve has uncoveredthe steam port N to the exhaust port P, and the steam in the right-hand end of the cylinder is being discharged. During the backwardstroke of the piston, the valve has been pushed to the left by theaction of the eccentric, and uncovers the steam port N to steam, andthe steam port M to exhaust. Steam is prevented from leaking from one side of the piston to theother side by means of spring rings fitted into grooves on the rim of thepiston. These rings press outwards against the walls of the pis
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