Practical application of the indicator with reference to the adjustment of valve gear on all styles of engines; by Ellison Lewis M

Author:Ellison, Lewis M
Language: eng
Format: epub, pdf
Tags: Indicators for steam engines
Publisher: Chicago : Published by the author
Published: 1894-03-25T05:00:00+00:00

The direction of motion is indicated by the arrow, and to reverse the engine, the arm as shown at the top, is removed to the unoccupied hole below it, and its side now shown, is turned toward the wheel. The other arm is removed to the unoccupied hole above in like manner, and the other parts are changed to correspond, so that the arrangement will correspond exactly with a view of the cut as it appears held up to a strong light and viewed from the back, or as it would in a looking glass. The positive eccentric is set to follow the crank with the same number of degrees on the other side of the crank, and the automatic eccentric C is set to correspond, by shifting the governor wheel around on the shaft. In the manner of adjusting with the indicator it is necessary that certain preliminary adjustments be made; first, that the rocker arm A which is carried by the positive eccentric, as shown in Fig. 49, to which the eccentric rod B is connected, shall be at right angles to the eccentric rod and vibrate to equal distances each side of a plumb line from its centre of vibration, when it is a horizontal engine and setting level. ■ This may be determined by the explanation previously given in Fig. 22, or the governor wheel and positive eccentric may be loosened and revolved on the shaft. The vibration of the rocker arm C of the automatic eccentric is determined in like manner, when the arm D is plumb and at right angles to the valve stem, and the arm C is at right angles to the inclined eccentric rod E. When it is a vertical engine and straight connected, the centre line of the rocker arm must be level at mid-stroke and at right angles to the rods. The remaining adjustments are

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