Valves and valve gears .. by Furman Franklin De Ronde 1870-

Author:Furman, Franklin De Ronde, 1870-
Language: eng
Format: epub
Tags: Steam-engines, Internal combustion engines
Publisher: New York, John Wiley & Sons, inc.; [etc., etc.]
Published: 1915-03-25T05:00:00+00:00

Taking r = 1 and Z = 5, and the offset A B = -zA C,

VALVES FOR RECIPROCATING STEAM ENGINES

137

Blf = (5 + 1)* -- (y)' = 35.75, or BD = 5.98.

Also, BE' = EA' - BT = (Z - r)2 - (^ y =(5 - 1)^- (^V^

16.75, otBE =^ 3.97.

,'. D E = 5.98 — 3.97 = 2.01, whereas the diameter of the crank-pm circle is 2.00.

NoRDBERG Engines Nordberg Standard Corliss Valve Gear

276. The Nordberg "Standard CorUss Valve Gear" is constructed as shown in Fig. 170, where the reach rod R C from the wristplate is shown attached to the "steam lever'' C, Ci, Cz,C2, which swings freely on the outer end of the steam bonnet T, This steam lever carries a rocker with an arm Li L to which are attached a steel-plate at L, and an arm 1/2 Af, which is pressed down by the flat spring S. The spring on its free end presses against a vertical faced surface on C3. The steel plate L engages with the plate K on the arm K A Ai, which is keyed to the valve-stem rod V. L drives K and remains in engagement with it imtil the

arm M meets the cam curve F on the cam block B, JBi, B2, when the rocker M L^LiL is slightly oscillated, thus drawing L away from K, and allowing the dashpot to pull down the "drop arm" K A Ai by means of the dashpot rod Q A . For earUer cut-off the cam rocker B Bi B2 is rotated forward slightly by the governor through the rod B P, thus causing the arm M to meet the cam curve F sooner and so oscillate the arm Li L and cause an earlier disengagement between L and K,

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