Working 1805 steam engine - photo and GIF

Murray's Hypocloidal steam engine, the oldest working steam engine with a hypocloidal gear.

Fullsize image: https://diqn32j8nouaz.cloudfront.net...e_fullsize.jpg

https://diqn32j8nouaz.cloudfront.net...eam_engine.jpg


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More: https://en.wikipedia.org/wiki/Murray...cloidal_Engine

Previously:

https://www.homemadetools.net/forum/...335#post116470
https://www.homemadetools.net/forum/...271#post142021
https://www.homemadetools.net/forum/...2579#post96643
https://www.homemadetools.net/forum/...723#post128920
https://www.homemadetools.net/forum/...692#post102204
https://www.homemadetools.net/forum/...0622#post72832

I designed a shear for a conveyor process using this 2:1 hypo cyclodial idea. (Same as this one). It worked quite well. The military was looking at a 2 stroke engine that employed a cyclodial crankshaft using this design for small drone engines. The idea was to reduce the piston side wear by reducing angular forces that conventional crankshafts produce. To me these kinds of mechanisms are poetry in motion and often over looked.

Where is the connection point between the gear and the pump shaft? It doesn’t seem to be enough room for any type of substantial mechanical connection between the two and I can’t make any headway by slowing down or enlarging the video I still don’t see an area that they can possibly connect properly?

Quote:

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Originally Posted by Radioman

Where is the connection point between the gear and the pump shaft? It doesn’t seem to be enough room for any type of substantial mechanical connection between the two and I can’t make any headway by slowing down or enlarging the video I still don’t see an area that they can possibly connect properly?

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the pump drive gear is mounted on a bearing which is mounted on a bearing the bearing is on a brilliantly designed double offset crank shaft the gear drives the pump via a trunnion connection the trunnion connection shaft has a bearing on it inside of the gear. the planet gear rotates inside of the fixed internal ring gear the yellow disk behind the gear on the shorter throw of the crankshaft operates the valve it too has a bearing inside of it the 2 rods extend down to the valve while keeping the disk from rotating
the whole set up is a complex yet simple use of gearing offsets and bearings to drive a reciprocating pump

There is a shaft journal that protrudes off the side of the planet gear. The axial center line of the shaft is located on the gear pitch line of the planet gear. This mechanism also requires a 2:1 ratio to achieve the proper reciprocating motion.