Slide Valve Gears; A New Graphical Method for Analyzing the Action of Slide Valves, Moved by Eccentrics, Link-Motions and Cut-Off Gears, Offering Easy ... and Valve-Gears, and for Establishing the - Softcover

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1878 edition. Excerpt: ... In. this latter case, nothing in relation to the link-motion is disturbed, and the original diagram of ideal eccentrics (Fig. 39) will serve, the only difference being a change of the crank from OK to OK', and the latter line is the base line for the new diagram, as regards the angles of advance, while OK remains the centre line of the locus. Tins result is identical with that obtained before in Fig. 38, but by this way of reasoning we can easily ascertain through what angle the crank should be shifted in order to get the line J'i at right angles with the new base line Fig OK'. This angle is evidently = IW=/3. (See Fig. 29.) If the link is as shown in Fig. 40, the crank need only be shifted so that the points i' and i (Fig. 33) are in a vertical line, and hence the angle J' (Fig. 40) should be used for the correction. Fig. 4O. The corresponding valve diagram is s'-iown in Fig. 41, where it will be seen tbat the lead remains nearly the same for the grades Q' q' and 5, but it diminishes rapidly, as the link is raised farther and adjusted to the grades q" and Q." At the latter grade the lead may even become negative, in other words, the opening of the steam-port takes place after the crank passed its centre. This method can evidently be applied with advantage only on en gines which are principally used running forward, as is the case with marir: ') e gines and locomotives. Problems. Problem VIII.--A Stephenson link-motion, with open rods, is to be constructed, to cut off at of the stroke when at full grades, with a lead of ." The largest port opening for the full grades is required to amount to If" and the inside lap to be ." The link is of the form shown in Fig. 25, its length P'P' is 12," the distance of...

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