Valves and Valve Gears Volume 1
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1915 edition. Excerpt: ...proper position at U in Fig. 157. The exhaust clutch rod Xi is indicated at 1 in Fig. 161. It swings the bell crank 3 through the angle 2 about the center 5. The pin at 5 is set in a bracket 6 which is a part of the exhaust bonnet casting. A connecting link 7 joins the end of the bell-crank arm with the arm 10 which is keyed to the valve stem. The purpose of this connecting link, and its proportions, are such that it will give the exhaust valve considerable motion at the time of opening the ports and a very small motion when the exhaust port is closed and the live steam is pressing the valve down on its cylindrical seat. The large travel during opening is represented approximately by the angle 8, while the small angle traveled during closure is represented approximately by the angle 9. The latter angle, it will be observed, is small because the centers of the bell-crank arm, the connecting link, and the crank pin are in line, or nearly so, when the arm JO is in its extreme right-hand position, and there is always slight travel of a follower as the driving mechanism reaches a dead point, and there is no motion at all at the dead point. Fig. 161.--Mechanism Surrounding Exhaust-valve Stem Rites Governor as Applied to Rice and Sargent Engine 255. The governor is shown at G in Fig. 157. The governor weights are driven by the governor shaft J through the belt B from the main shaft of the engine. In Fig. 162 the governor casing is shown at 7 and also at 7 in the section taken on X X. The governor shaft at 1 has attached to it two arms 2, 2, which carry pins supporting freely the weights 4 and 20. The weight 4 carries a balancing curved rib 5, and also has attached to it a complete circular /-shaped ring as shown at 6 in the full front view, and...
- 189 x 246 x 4mm | 159g
- 13 Sep 2013
- United States
- black & white illustrations