Has anyone ever made a reduction gearbox? - Page 2
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  1. #21
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    Why cant you simply run the motor at 1500 rpm.......this may need the governor altered .........my experience of reductions on alternator drives is they need a lot of maintenance if in continuous use,and also increase fuel consumption by at least 10%.........a cheap gear unit is a truck gearbox with unneeded gears taken out.

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  3. #22
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    Because the motor does not have the power output at 1500rpm. It is a modern high speed diesel.

  4. #23
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    Quote Originally Posted by adama View Post
    Yes car alternators have bearings both ends, lots of generator mounted "power aka mains voltage" alternators only have a bearing the far end! its how they effectively get around the whole shaft alignment issue. Equally they tend to bolt straight onto the fly wheel face, so lots don't even really have a shaft more some kinda coupling flange.

    200 amps at 12v is only what 2.4Kw? Aka 3hp ish? Were looking at 15kw over 6 times more transmitted power here and far more than a single V belt will transmit.
    Since when did I mention a V-belt? I would go serpentine if I was making a custom pulley set. As far as your math I do know that to create 3hp of electricity creates a lot more drag than 3hp on the engine. They would easily bring a 5hp motor to a dead stop on a test bench without putting out anywhere near max power.
    Last edited by Dualkit; 03-13-2019 at 02:29 PM.

  5. #24
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    If you could find a 4x4 transfer case with the right ratio in low range.
    Or any small manual transmission that has your ratio in it somewhere. Put it in that gear and lock or remove the shift lever.

  6. #25
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    Quote Originally Posted by RC99 View Post
    Because the motor does not have the power output at 1500rpm. It is a modern high speIsdiesel.
    Isn't the motor currently turning 1750 rpm for 60hz or is this a pto driven alternator?

    Usually they just de-rate the alternator and run at 1500 for 50hz.

    I suspect that no matter what you come up with for a speed reducer, the loss in efficiency is going to be close to the reduction in engine power output.

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  8. #26
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    Had a friend make a gear reduction box for an ultralight from a planetary gearset stolen/borrowed from a Chrysler automatic transmission. Mounted it in an aluminum box. As far as I know it worked fine. Similar horsepower and rpm to the OP needs.

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    Quote Originally Posted by Ziggy2 View Post
    Isn't the motor currently turning 1750 rpm for 60hz or is this a pto driven alternator?

    Usually they just de-rate the alternator and run at 1500 for 50hz.

    I suspect that no matter what you come up with for a speed reducer, the loss in efficiency is going to be close to the reduction in engine power output.
    RC said it was a high speed diesel - I suspect that means it's a 3000 or 3600 rpm top speed engine and has way too little power at 1500 rpm.

    What he needs is a speed reducer, a 2 pole alternator head instead of the 4 pole or a low rpm diesel. He's chosen to pursue option A. 60 Hz has nothing to do with anything, all our power is 50Hz.

    PDW

  10. #28
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    I have run our 50 cycle stuff on 60 cycle..........just makes motors run a bit faster......that was during the 80s power strikes in Qld,when Bjelke smashed the Electrical Trades Union........some people had no power for 2 months cause the union had black banned areas and poles.

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    Have a look at an older marine reduction box.The old dog clutch type. 1.52:1 rings a bell, that would be close to what you're looking for.

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    One thing to consider is cooling the gearbox. you might want to consider a finned heat sink section on the gearbox housing.

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  14. #31
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    Quote Originally Posted by snapatap View Post
    One thing to consider is cooling the gearbox. you might want to consider a finned heat sink section on the gearbox housing.
    I see modern cars have finned diffs these days.

    In any case an update is warranted. After researching and looking and thinking it will simply be too much rooting around to find a gearbox and modify and change and weld and so on and so on.

    So I ordered an 11kva 2 pole generator and will hook it to the motor instead, all it needs is a coupling.

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    Quote Originally Posted by RC99 View Post
    I see modern cars have finned diffs these days.

    In any case an update is warranted. After researching and looking and thinking it will simply be too much rooting around to find a gearbox and modify and change and weld and so on and so on.

    So I ordered an 11kva 2 pole generator and will hook it to the motor instead, all it needs is a coupling.
    So now you can sell me your 4 pole generator head and I can fit it to one of my existing Lister 1800 rpm diesels and we'll all be happy.....

    PDW

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    Well I might turn that into a PTO driven generator yet. I already have a big 6.3/1 PTO gearbox here.

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    Are you trying to solve Australia's power problems? one small generator at a time

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    LOL, I am surprised being in SA you have not put an offer in.

    You could use it to charge that big battery, get a big wheel put on the input shaft and get some of the renewable fanatics to run around inside to turn it.

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    Quote Originally Posted by RC99 View Post
    LOL, I am surprised being in SA you have not put an offer in.

    You could use it to charge that big battery, get a big wheel put on the input shaft and get some of the renewable fanatics to run around inside to turn it.
    How stupid do you think South Australians..... never mind, I withdraw the question.

    PDW

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  21. #37
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    Quote Originally Posted by PDW View Post
    So now you can sell me your 4 pole generator head and I can fit it to one of my existing Lister 1800 rpm diesels and we'll all be happy.....

    PDW
    Or a Detroit 2 stroke.
    I know they made 2-71 gen sets that ran at 1200 rpm.
    Last until the end of time, making full rated power.

    --D

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  23. #38
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    Quote Originally Posted by RC99 View Post
    LOL, I am surprised being in SA you have not put an offer in.

    You could use it to charge that big battery, get a big wheel put on the input shaft and get some of the renewable fanatics to run around inside to turn it.
    Aready have a genset with a detroit on it. have to get that co2 in the atmosphere some how.

  24. #39
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    Quote Originally Posted by PDW View Post
    How stupid do you think South Australians..... never mind, I withdraw the question.

    PDW
    Which head did that question come from?

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  26. #40
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    I was looking for stuff to scrap today,and what to find?.......a 1.5/1 reduction unit branded "Hub City".......hollow splined shaft in and out.Forgotten I had it.


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