Re: what is highest HP rated hydrostatic transmiss

Posted by buickanddeere on June 25, 2005 at 05:43:11 from (192.75.48.150):

In Reply to: Re: what is highest HP rated hydrostatic transmiss posted by jim on June 24, 2005 at 22:48:06:

The tile plows use hydraulic drive so they can steer to follow the terrain level. They don't want to sink the plough in a full 6 ft to cross a ridge or knoll. Tile that deep don't drain the surface as well in heavy soil. Of course tile to shallow isn't good either.
The hydraulics allow full power to still be applied to the tracks during turns. Keeps from spinning out and getting stopped.
Saves allot of clutch/brake wear from making so many turns under heavy load.
Of course efficiency doesn't compare to a planetary transmission with a lock-up torque converter. Burning some extra fuel does beat rebuilding steering clutches/brakes.
Didn't the US Army upgrade the steering in the M1-A and later tanks or did that fall through? Instead of steering clutches and brakes. They use a version of the Torsion differential with worm gears. A small electric motor applies some bias and tank turns. No significant drag or power loss.
For really large drives in locomotives, off road trucks and ships, electrics are used.

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