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Sun and Planet Wheels, first devised by James Watt to avoid the use of a crank, which was patented. In his device the epicyclic train arm was replaced by the stationary groove, shown as green, which kept the two wheels in gear. The yellow circle represents the engine shaft, to which the red gear was fastened, purple connecting rod attached to walking beam (here it is attached to the piston). The blue gear was rigidly attached to the end of the connecting rod. While with such an arrangement it is not strictly true that the blue gear does not turn. Since connecting rod rigidly attached to blue gear, the blue gear oscillates while it is hard to see this oscillation. At the same time, the red gear does not rotate smoothly. It's rotation also oscillates around a smooth rotation.

The yellow engine shaft and red gear will make two turns every time the blue gear passes around it.

04 Sep 2013

Nice one , Thanks a lot

12 Dec 2013

Thanks, I am working in EMAL, Dubai. I have seene this type of combination of gear box in some machine.
More knowldge .......abt this..

12 Dec 2013

The sun and planet gear (also called the planet and sun gear) was a method of converting reciprocating motion to rotary motion and was used in the first rotative beam engines.

It was invented by the Scottish engineer William Murdoch, an empl

12 Dec 2013

The sun and planet gear converted the vertical motion of a beam, driven by a

Arun kumar
09 Jan 2014

Today i have a seminar, so i'll search this topic vry intrstn to known abt sunplanet gear... Thank u guys..

Batuhan Özdemir
20 Apr 2014

Hi, we have a term project about sun and planet wheels and our professor want us to analyze all of things. If you have , can you post me those? my e-mail:
Thank you!!

17 Feb 2015

This stinks!

Manoj kumar
11 Apr 2016

Thank this is very helpful for me for doing seminar

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