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Watts sun and planner gear.

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Maurice25/05/2020 20:02:56
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Just out of curiosity, has Watt's sun and planet mechanism ever been used for anything other than its original purpose, of doubling the speed of a beam engine crankshaft?

V8Eng25/05/2020 20:14:25
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Posted by Maurice on 25/05/2020 20:02:56:

Just out of curiosity, has Watt's sun and planet mechanism ever been used for anything other than its original purpose, of doubling the speed of a beam engine crankshaft?

I thought it was invented as an answer to the problem of using a crank which had already been patented by a.n. other who’s name escapes me at the moment.

But I stand to be corrected on this.

Edited By V8Eng on 25/05/2020 20:18:14

JasonB25/05/2020 20:19:53
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I did not think it doubled up the speed as the two gears were the same size. Epicyclic gear often has 2:1 and was used on some 4-stroke engines with a steam engine type eccentric rather than usual 2:1 spur gears.and cam

I've made a couple, one for the Robinson X-type which actually used them and another for an engine of my own design.

Ploughing engines also had epicyclic gears in the coiling gear.

Edited By JasonB on 25/05/2020 20:23:36

Nick Clarke 325/05/2020 20:39:42
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Posted by V8Eng on 25/05/2020 20:14:25:
Posted by Maurice on 25/05/2020 20:02:56:

Just out of curiosity, has Watt's sun and planet mechanism ever been used for anything other than its original purpose, of doubling the speed of a beam engine crankshaft?

I thought it was invented as an answer to the problem of using a crank which had already been patented by a.n. other who’s name escapes me at the moment.

But I stand to be corrected on this.

Edited By V8Eng on 25/05/2020 20:18:14

Dragging out old memories James Pickard rings a bell - I too will be happy to be corrected if I have misremembered

Nick

duncan webster25/05/2020 20:50:17
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Sun and planet doubles the flywheel speed, honest. Think of it as follows:

consider the gear attached to the con rod to be loose
turn the crank one rev, the loose gear will roll around the gear on the crankshaft and do one turn around the crankpin
in reality it can't turn, it's fastened to the con rod, so rotate it back around the crankpin one turn to where t should be.
the crankshaft will do another rev, so it has now done 2 revs

As others say it was a dodge to get round patent, but driving the flywheel at double speed made it have the same effect as quadrupling the flywheel mass, as the energy stored increases as speed squared

And I don't reckon Jason's gears are epicyclic anyway, there is no sun gear.

 

Edited By duncan webster on 25/05/2020 20:52:02

Clive Brown 125/05/2020 20:51:51
426 forum posts
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There's a nice illustration of the gear in Wikipedia, using Meccano. For a 1:1 gear ratio, the sun and flywheel rotate twice for every circuit of the planet.

Maurice26/05/2020 02:38:23
464 forum posts
50 photos

I was very pleased with myself, when I managed a Meccano version of the gear, having just see it in the Science Museum when I was twelve. I was just wondering if it had been used on treadle mahines or hand operated water pumps, or something. It seems too good to have had a single use.

Maurice.

Nimble26/05/2020 03:03:16
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38 forum posts
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Seeing this posting I thought I would post some pictures of odd gear sets that I photographed in a Renault Museum in parisodd gear.jpg

Edited By Nimble on 26/05/2020 03:05:29

Edited By Nimble on 26/05/2020 03:06:46

Nimble26/05/2020 03:08:01
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Having troubles postingodd gear (2).jpg

Gary Wooding26/05/2020 07:01:00
691 forum posts
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Posted by JasonB on 25/05/2020 20:19:53:

I did not think it doubled up the speed as the two gears were the same size. Epicyclic gear often has 2:1 and was used on some 4-stroke engines with a steam engine type eccentric rather than usual 2:1 spur gears.and cam

Take a look at ***THIS***

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