Valve-gears for steam-engines by Peabody Cecil Hobart 1855-1934

Author:Peabody, Cecil Hobart, 1855-1934
Language: eng
Format: epub, pdf
Tags: Steam-engines
Publisher: New York, J. Wiley & Sons; [etc., etc.]
Published: 1906-03-25T05:00:00+00:00

VALVE-GEARS FOR STEAM-ENGINES.

of or ahead of the link-arc, except for the example shown by Table V, which had the link-pins on the link-arc. The saddle-pin in all cases is at the middle of the length of the link. Other dimensions of the link-motion and details of the arrangement are given with the tables.

In the example shown by Table I the reverse-shaft was set square, i.e., with the arm horizontal at mid-gear as shown on PL XX, and the cut-off was equalized at ^ stroke only. This may be considered to be the typical example. The lead at full-gear, or with the cut-off at 22^ inches, is small, but increases rapidly as the cut-off is shortened, till it is nearly half an inch when the cut-off is at quarter stroke; meanwhile the travel and port-opening both decrease rapidly. The travel of the valve in full-gear is more than twice the eccentricity, due to the slip of the link-block and to other irregularities.

TABLE I.

Rocker used—link-pins 2J inches back of link-arc. Cut-off equalized at ^d stroke. Saddle-pin ^ of an inch back of link-arc. Distance between link-pins 14 inches.

An inequality in the cut-off of \ of an inch in 24 inches, i.e., one per cent of the stroke, cannot be distinguished in the running of the engine or on the indicator-diagram; consequently the

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