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Powertrain efficiency comparsion

Powertrain efficiency comparsion

Powertrain efficiency comparsion

(OP)
Does anyone know of a good source of study contrasting the basic differences in efficiency between the following transmissions when used for system drive (not ground drive):

- Mechanical powershift
- Belt drive
- CVT
- Hydrostatic

I have always understood a general rule of thumb when discussing the differences in efficiency (as follows):

- 99-100% efficient for powershift
- 95-97% for belt drive
- 85% for CVT
- 65% for hydrostatic transmission)

Thanks for your assistance.

RE: Powertrain efficiency comparsion

As an example of that a hypoid diff (back axle of car) can have an efficiency as low as 40%, in some operating conditions.

Cheers

Greg Locock

SIG:Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.

RE: Powertrain efficiency comparsion

http://news.thomasnet.com/images/large/014/14625.jpg

This ingenious motorized milling spindle has an oil lubricated concentric constant mesh gearbox.
Just idling at high speeds it needs considerable internal coolant flow and active lube oil cooling and consumes a few electrical HP.
Efficiency [100 X (0 HP out)]/( several HP in) = 0%

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