Crank Angles
Locomotives with Gresley valve gear must have the three pistons operating at precisely 120 degree intervals. (Different spacings could be accommodated by different lever proportions, if there were any advantage to a spacing other than 120-120-120.) In order for the inside crank to clear the leading coupled axle, the inside cylinder of a locomotive with Gresley valve gear is typically positioned higher than the outside cylinders and angled downward. To maintain a smooth flow of torque, the crank angles are offset from equal 120 degree spacing to compensate for the angle of the inside cylinder (e.g. 120/113/127 degrees). The resultant timing of the blast from steam exiting the cylinders still gives these three-cylinder locomotives a regular exhaust beat.
Read more about this topic: Gresley Conjugated Valve Gear
Famous quotes containing the word crank:
“I review novels to make money, because it is easier for a sluggard to write an article a fortnight than a book a year, because the writer is soothed by the opiate of action, the crank by posing as a good journalist, and having an airhole. I dislike it. I do it and I am always resolving to give it up.”
—Cyril Connolly (1903–1974)