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Post by dinmoremanor on Dec 8, 2006 20:06:28 GMT
Any body know of a good source of hydraulic drives for something in 7 1/4 with a low reving engine? Have had little luck finding suitable things so far, seems a bit of a minefield!! Cheers, Mike Been looking at hydraulic boat gearboxes on ebay, I wonder if one of those would be any good...... hmmm  |
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Post by baggo on Dec 8, 2006 21:43:35 GMT
have a look at this petrol hydraulic on Station Road Steam. www.stationroadsteam.co.uk/archive/2269/index.htmApparently this has a hydraulic drive made by Eaton. Raonoke still manufacture locos with hydraulic drives and sell powered trucks with hydraulic motors. They may be able to help you. John |
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Post by greasemonkey on Dec 8, 2006 23:31:19 GMT
I seem to remember Polly being able to supply a hydraulic drive!
Andy
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Post by Chris Kelland on Dec 9, 2006 0:19:59 GMT
Hi Mike, If you are interested in Hydrostatic drives look at www.tecumsehuk.co.uk/eaton.htmThis is the source for engines and drives that Polly use. There are several other distributors around the country. The Oxford club has two 'diesels' with model 7 transmission and a 5hp Honda which really run well. Eaton's own site www.hydraulics.eaton.com/ has lots of tech info. If you can't find what you want let me know and I'll send you the file. Chris. |
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PH
Seasoned Member
Posts: 114
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Post by PH on Dec 9, 2006 9:45:05 GMT
I use an Eaton type 6 hydraulic drive in a diesel outline loco. I got the drive from Bruce Engineering It's a wonderful piece of kit - forward/reverse with variable ratio from a single control lever. Contrary to what I was expecting, the drive from stanstill takes up very smoothly and it capable of creeping along. I'm driving the input shaft at 1500/2000 rpm from a lawn mower engine and gearing down the output at the bogies - this is because the unit is more efficient when the speeds of the input and output shaft are closer. I've got a complete set of Eaton data sheets if you want them.
Only downside, the price of the unit, but I have 2 machines which use the same drive - since it's self-contained it takes about 3 minutes to slacken off the drive belts, undo 6 bolts holding it down and transfer it to the other machine.
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John Lee
Part of the e-furniture
Posts: 375
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Post by John Lee on Dec 9, 2006 18:57:59 GMT
Diesels?? whats that??
;D
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Post by dinmoremanor on Dec 11, 2006 12:24:45 GMT
Cheers for the replys chaps, An eaton unit would be nice, but 600-700 quid for what is intended to be a budget loco is a bit expensive. I have been trying to find out more about hydraulic boat gearboxes, some go for quite little money on ebay and the like, will keep on investigating! Cheers, Mike
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Post by Boadicea on Dec 11, 2006 13:21:45 GMT
John, I think they were some crude form of rail motive power. From what I can recall they used a diesel engine to drive a generator which drove electric motors OR hydraulic pumps driving some sort of fluid-flywheel type thing.  They were terribly complex, extremely unreliable, dirty, smelly, still took 2 people to drive them and all there was for people to get excited about was what colour they were, where the air horns were positioned, that they had a plug-in for a kettle and a toilet. They even had a steam generator to heat the coaches!! The best of them could do 100mph, but most only 90mph. All involved hated them and rumour has it controllers did not diagram them to work to Dover in case someone pushed them over the white cliffs! ;D On a good day on the East Coast, one could do the trip from Kings Cross to Edinburgh in only half an hour longer than an A4. ;D You might find some on a preserved railway but most people grudge paying money to ride behind one. They were mentioned in the 1960s Railway Modernisation Plan as a stop-gap between steam and electrification. Suppose that's my Karma gone as well now!  Regards, Bo. |
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Post by chris vine on Dec 11, 2006 13:40:22 GMT
You might talk to a repairer of ride-on garden mowers/lawn tractors. Some of them use a hydraulic variable drive for the wheels. (some use a gearbox and some use a disk on disk variable drive)
You might get one which is from a defunct machine or a drive which you could fix up.......
Chris.
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John Lee
Part of the e-furniture
Posts: 375
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Post by John Lee on Dec 11, 2006 18:04:59 GMT
John, I think they were some crude form of rail motive power. From what I can recall they used a diesel engine to drive a generator which drove electric motors OR hydraulic pumps driving some sort of fluid-flywheel type thing. They were terribly complex, extremely unreliable, dirty, smelly, still took 2 people to drive them and all there was for people to get excited about was what colour they were, where the air horns were positioned, that they had a plug-in for a kettle and a toilet. They even had a steam generator to heat the coaches!! The best of them could do 100mph, but most only 90mph. All involved hated them and rumour has it controllers did not diagram them to work to Dover in case someone pushed them over the white cliffs! ;D On a good day on the East Coast, one could do the trip from Kings Cross to Edinburgh in only half an hour longer than an A4. ;D You might find some on a preserved railway but most people grudge paying money to ride behind one. They were mentioned in the 1960s Railway Modernisation Plan as a stop-gap between steam and electrification. Suppose that's my Karma gone as well now! Regards, Bo. Ahhh I thought so. Not nice to travel behind at £160 a ticket. Wot's electrification then? Do you get electrified and suddenly, like a Doctor Who episode in a Tardis, get sent to Kings Cross in an instant?? They had different colours too?. I may dash to the National Railway Museum (all of 6 miles away) to check this out. Very exciting. Regards, John (Karma deleted too, due to the Modelworks episode) |
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Post by steamingon on Dec 31, 2006 23:36:03 GMT
Hello,
Most diesels in the US go one of two routes. Either the use of a Eaton #7 hydrostatic transmission or separate pump/ motor combination.
About 5 years ago in the now defunct Modeltec magazine there was a series on building a 35 ton Plymouth gas locomotive. It used a 4 hp gas engine coupled to a 1 gpm vane pump ( vane pumps require less hp to turn, it is whats in most power steering units) . The 1.5 cu. in. gear motor drove the axles by chain with a 2:1 reduction. It proved to be a very effective system with the engine operating just above idle.
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Noddy
Statesman
Posts: 672
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Post by Noddy on Jan 14, 2007 17:35:23 GMT
Before inverter drives and soft starts on induction mortors became the norm, things like tunnel kilns, continuous bakers ovens, the feed screws on big saws etc used self contained hydrostatic drives to provide the speed variation. These came in a number of sizes. I still have a couple of Carter drives (i think they are reversible ones) although other makes were around. Boeringer sterner made a very nice one with a lever that took it from full ahead to full astern with a flick of the wrist (i think that was that drives downfall, as we wore it out). My caving club still has a carter drive on a man riding winch with belt drive from a 3hp honda engine, that one has a rotating knob to go from neutral to forward or reverse. for emergency stops we keep hold of the engine off switch.
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