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Bosch generator with sachs two stroke


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  #11  
Old 12-09-2018, 06:29:40 PM
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Default Re: Bosch generator with sachs two stroke

The coupling you’re looking for is called a ‘LoveJoy’ coupler.
Here is a recent thread about just such a project:
https://www.smokstak.com/forum/showthread.php?t=183130
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  #12  
Old 12-09-2018, 06:49:26 PM
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Default Re: Bosch generator with sachs two stroke

I realy don't want to rebuild the engine. It also does 3000 rpm,it smokes,is heavy end uses a lot of fuel. Not so easy to get spares to. I am planning to use this generator frequently so the briggs seems a better choice for me. I had been thinking about lowering the RPM with belt drive but I am worried the engine won't have enough power to pull the load.
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Old 12-09-2018, 09:41:08 PM
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Default Re: Bosch generator with sachs two stroke

Good point about the hp. If the engine is 11 hp @ 3600 rpm, it ought to be around 9 hp or a bit more @ 3000 rpm. And if the generator is 5 kW, it ought to take maybe as much as 8 hp to drive it. Leaving you with a little reserve, which is always good practice.

In my case the generator is only 2 kW. The Wisconsin will actually pull 3 kW out of the set up I have.
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  #14  
Old 12-10-2018, 04:21:34 PM
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Default Re: Bosch generator with sachs two stroke

It is a balancing act to match engine HP to generator output.
Too much HP and you will be melting the generator into a pool of copper as the engine sings merrily along.
Too little HP and the engine will stall out before you get maximum usable wattage from the generator.
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Old 12-10-2018, 04:54:01 PM
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Default Re: Bosch generator with sachs two stroke

But not if you don't overload the generator.
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Old 01-17-2019, 06:46:38 PM
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Default Re: Bosch generator with sachs two stroke

I made good progress the last couple of evenings. The aluminium part to hold the front bearing is machined and the generator is back together. It turns smoothly and I think it wil work just fine. I also machined a shaft with a tapered end to take the lovejoy coupler. Just need to buy the coupler and adjust the mountings on the frame and I can give it a test run. Need to find some carbon brushes to,I broke two when taking the generator appart.
Wil try to take some pictures tomorow and post them.

Tim
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  #17  
Old Yesterday, 11:31:09 AM
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Default Re: Bosch generator with sachs two stroke

I have been thinking and changed my mind about the use off the lovejoy coupler. They are not cheap. I going to remove the crankshaft from the briggs engine an turn a taper on the end of it. The shaft is long enough and so it wil fit
directly in the generator shaft. Wil be simpler this way.
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  #18  
Old Yesterday, 01:39:38 PM
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Default Re: Bosch generator with sachs two stroke

Probably a good idea. The one time I saw an emgine driving a generator through a Lovejoy coupler it rattled like mad and the project was quickly abandoned.

The generator forms part of the system's flywheel, and so torque between it and the engine is constantly reversing between power strokes. It must be a ridgid connection (ideally), an adequately resiliant coupling, or (possibly) a coupling with some "spring" in it, so long as the resulting natural frequency is avoided.
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Old Yesterday, 01:56:30 PM
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Exclamation Re: Bosch generator with sachs two stroke

Personally, I would not run a generator thru a lovejoy. It would hammer itself to bits in short order!
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