Author Topic: hydro-static final drive  (Read 12998 times)

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Offline jl222

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Re: hydro-static final drive
« Reply #15 on: October 22, 2008, 02:52:31 PM »
Jl222,
No problem driving a blower, plus you could put a pressure transduce in the output and we could uses that at the feed back for a closed loop blower control system, i.e. you would set the boost you want and the control system would spin the blower at what ever speed required to make the set pressue and it would do this at any engine rpm that provided enough power to run the blower at the set speed. You could also program the pressure to increase or decrease depending upon what ever parameter you needed. It only requires $$$$$$$!

floydjer,
We have done exactly that on some large diesel trucks, a variable pump on the engine and a variable motor on the diff. They ran the engine at a set rpm, around 1000 in this case, and the speed was varied by the hydrostatic drive and the horsepower was controlled by the turbo boost. These got over 10 mpg wiht a 40,000 lb load.  Again the problem is that we are talking some big chunks of iron and very expensive plus you need to have some sort of control system, electronic or manual.

Just a note of history, the very first Indy turbine car that PJ almost won Indy in was 4wd and use hydrostatic drive.

Rex

Rex




  Rex

 How big a pump [size wise] and what would a system weigh to drive 150 -200 hp?
 Were always looking for sponsers :-D

                           JL222

McRat

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Re: hydro-static final drive
« Reply #16 on: October 22, 2008, 04:21:49 PM »
Sounds like a great idea for a max-effort sled-pulling truck.  Tie it into boost, so when the sled tries to pull you off the charger near the end, it just keeps downshifting at max power.