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Flex8ble couplings

thread404-518138

Flex8ble couplings

Flex8ble couplings

(OP)
What would be a suitable flexible coupling type for a 10 hp Diesel engine to a 6kva alternator at 3000 rpm , both having 25 mm keyed shafts ?
Replies continue below

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RE: Flex8ble couplings

waterworks178,

I would select a 25mm keyed coupling that can transmit 10hp at 3000rpm at your maximum centring and angle errors.

--
JHG

RE: Flex8ble couplings

I addition to the above your options would include torsionally soft or stiff. I haven't built a generator/engine machine so I can't tell you how they are normally done.

RE: Flex8ble couplings

MAnufacturers' coupling calculators usually add a hefty "Application service factor" when an engine is the driving unit/prime mover.

1.25 for an electric motor

2.0 IC engine 3 cyl or fewer

The design of the keyway/keyseat may be important for good fatigue life.

RE: Flex8ble couplings

You might consider a fluid coupling - plenty of manufacturers


Video

RE: Flex8ble couplings

For a generator? No way. The engine needa direct control of speed. For low horsepower? This can't be expensive. The Dodge Paraflex couplings work well here. Falk Grid Couplings work well but are expensive and require a lot of maintenance.

RE: Flex8ble couplings

Never coupled to internal combustion engines, but have experience with fluid couplings on conveyor drives. Fluid coupling mfrs indicate good results in coupling to IC engines.

Some perspective on flexible couplings - Common Causes of Tire Coupling Failures

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