Cranked axle

This topic has 8 replies, 5 voices, and was last updated 17 April 2013 at 20:19 by loco man.

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16 March 2013 at 11:24 #6624
Eric Cox
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@ericcox50497
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16 March 2013 at 11:24 #114544
Eric Cox
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@ericcox50497
I've been looking at the steam engine paintings by Henry Maurice Whitcombe

bbc.co.uk/arts/yourpaintings/paintings/search/painted_by/henry-maurice-whitcombe

A number of them have two driving wheels with inboard cylinders. (first photo)

Would I be right in thinking that the pistons are connected to a cranked driving axle.

The second photo has what appears to be inboard cylinders but an outboard connecting rod.

The third photo is just a novel French engine this cylinders half way along the frames

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16 March 2013 at 11:54 #114547
Lambton
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@lambton
Eric,

Nothing unusual about inside cylinders/pistons driving a cranked axle. A very large number of locos had this arrangement. It is not possible to have inside coupling rods.

Correct terminology; a connecting rod connects the crank (inside or outside) to the cross head. The wheels are connected together by coupling rods that for obvious reasons can never be inside the wheels.

Eric
16 March 2013 at 13:22 #114553
Sub Mandrel
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@submandrel
Yes 1 & 2 are inside cylindered locos, not an uncommon arrangment even in later days, but not easy for the maintenance crews!

No 2 must have a cranked layshaft where you might expect to find another axle!

2 and 3 appear to be a Cramptons – by a British designer Robert Crampton, if built in France.

Neil
17 March 2013 at 09:27 #114595
Eric Cox
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@ericcox50497
Yes, No 2 is a Crampton buil in 1851 by Robert Stephenson company for the South Eastern Railway.
18 March 2013 at 13:46 #114687
Alan Redgrave
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@alanredgrave69942
Hello Chaps———- yes, No2. has a JACKSHAFT drive…. Take a look at this }————– http://en.wikipedia.org/wiki/Jackshaft_(locomotive) ————- No3. is the image that most would associate with the name Crampton I think ??
18 March 2013 at 20:32 #114707
Sub Mandrel
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@submandrel
Hi Alan,

The jackshaft design was Crampton's solution to inside cylinders driving wheels behind the firebox, so just as much a 'Crampton' as "No. 3" .

What a shame we can't see these curious beasties in action.

Neil
16 April 2013 at 21:41 #117069
loco man
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@locoman67579
An earlier post suggested that coupling rods cannot be inside the wheels. Not so. Chapelon in his 2-10-0 compounds used inside coupling rods (between the frames and hence 'inside the wheels' ) to couple the H.P. and L.P. cylinders. This arrangement is clearly shewn in the reprint of Chapelon's book "La locomotive a' vapeur" figure 319
17 April 2013 at 20:19 #117181
loco man
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@locoman67579
Sorry – but before anyone else spots the mistake- I meant 2-10-2
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