General Category > Chatterbox
Penn Valve Gear???
Michael S.:
The eccentric of the steam engine is loosely attached to the crankshaft.
The reversal of the engine must be carried out using an extra mechanism, a “release lever” ( Ausklinkhebel ). The picture is from the book of the model of the "Diesbar".
Michael
paul gough:
Thank you very much Michael, this is a great help in coming to grips with this engines valve gear arrangement. I notice the PD Krippen has a similar engine and gear. What still is unclear is the purpose of the large circular plates adjacent to the eccentrics and set at what appears to be 180 degrees. I speculate, are they part of the slip eccentric drive with the plates contributing to some form of balance/counter weight to assist the operator when manually operating the valves in a reversing manouver??? I eagerly await the arrival of the book. Regards, Paul Gough.
Michael S.:
Hello Paul,
Since I can't explain this to you straight away, I just called a machinist from the Dresden Steamboat Company and asked him about the Diesbar's steam engine. The discs are initially compensating weights and also carry two screws for the stops for the sliding eccentric. The stops are adjustable.
Only the Diesbar's steam engine was built strictly according to Penn's patent.
All other steam engines in the Dresden fleet are a mixture of Stephenson and Penn. These are engines that were designed in Germany.
Greetings Michael
paul gough:
Michael, Again many thanks for your initiative in clarifying the purpose of the 'discs'. I truely wish I could get to see these astonishingly elegant and beautiful vessels with their endearing 'wobbly' engines. May they all last another 100 years. Regards, Paul Gough.
Zephyrin:
There's a complete description and drawing of a model 2-cylinder oscillating engine, very similar to the 1890 Penn engine, in KN Harris's book, "model stationary and marine engines", with steam distribution via an eccentrically-driven oscillating disk.
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