Modern American locomotive engines; their design, construction and management. A practical work for practical men by Edwards Emory b. 1841

Author:Edwards, Emory, b. 1841
Language: eng
Format: epub, pdf
Tags: Locomotives, Locomotives, Locomotives
Publisher: Bridgeport, Conn., Frederick Keppy
Published: 1883-03-25T05:00:00+00:00

THE PISTON AND ITS RINGS.

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under the high pressure employed in locomotive engines. The contrivance is thus described in a paper on an improved piston for steam engines: /'Three separate grooves, each J^ inch wide, ^ inch apart, and T6 inch deep, are turned in the circumference of the piston, and these grooves are fitted with elastic packing rings. These rings, which may be of brass, steel, or iron, are drawn of a suitable section to fit the grooves

Fig. 68.

in the piston, and are bent in rollers to the proper curvature, the diameter of the circle to which they are bent being about one-tenth larger than the cylinder. They are placed in the grooves in a compressed state, and along with the bodv of the piston are thus put into the cylinder, care being taken to block the steam port. The rings are therefore forced outwards by their own elasticity, which is found quite sufficient to keep them steam-tight." Of course the rings are put on so as to break joint. One object in the construction of this particular piston has been to reduce as much as possible the amount of rubbing surface. It is a maxim

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