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Talk:Stephenson valve gear

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This is an old revision of this page, as edited by 139.78.96.87 (talk) at 00:49, 10 March 2007 (→Picture Goof? ). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision .Revision as of 00:49, 10 March 2007 by 139.78.96.87 (talk) (→Picture Goof? )
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Picture Goof?

According to Vol. 1, of Audel's Engineer's and Mechanics Guide, The Stephenson gear has a curved link, the straight link-variant of the Stephanson gear as is shown in the picture is more correctly called the Gooch gear. This is an important difference, as the curved link tends to give better equalization at varied cutoffs.-WK-139.78.96.115 02:02, 8 March 2007 (UTC) [reply ]

I've just removed a caption by an IP poster from Czech Republic which labelled the motion as "Allan-Trick" valve gear. It was not summarised or sourced, but there is such a system, from that part of the world, and it does look a bit like this. --Old Moonraker 15:11, 9 March 2007 (UTC) [reply ]
Just found this on Commons.--Old Moonraker 15:55, 9 March 2007 (UTC) [reply ]
OK, I looked when I got home and what is shown is the Allan gear, or, at least, a variant on it. The Allan gear has a straight link as is shown, pivoted at its end and on a pendulumn rod, but from a fixed point. A radius rod is moved up and down on the link to give different cut-off and reverse. The Allan-Trick variant shown here seems to be different in that the link too moves up and down but in the opposite direction as the link and at a different rate, and that it is pivotes at the middle

The gooch link has a curved link. There are endless variants. This site here has downloadable animations of many different steam engine valve gears. [Valve Gear]

Animation

The animated gif is broken. Instead of the crankshaft rotating around the its center, and the eccentrics doing their thing, the crankshaft is rotating around the crankpin. That results in the drawing losing all meaning. I'd try to fix it, but I don't have the tools to that were used to create the original image.

I left a note on the creator's talk page. He promised to fix it, but he's a busy chap... Moonraker88 11:58, 18 September 2006 (UTC) [reply ]

I agree the gif had me perplexed for a few moments. I could see something amiss but it took a moment or two for the penny to drop. The article also needs a note about the subtle difference between Launch and Loco links.--7severn7 19:11, 3 October 2006 (UTC) [reply ]

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