Paul,

I've unearthed a couple of interesting NASA papers on multiroller traction drives for small turbines.

The first paper dates from 1978 and describes a 14.7 : 1 planetary drive developed by one A.L. Nasvytis.

The second paper is from 1982 and mates the same traction drive to a Chrysler automotive gas turbine engine.

Nasvytis is credited with coming up with the idea for stepped planets that allow much steeper ratios. Looking at the references section of these papers we see that he published an SAE paper on his multiroller traction drive as early as 1966.

Both of the NASA papers discuss challenges of traction drive design -- like the traction fluid and high contact stresses inherent in roller drives.

Might be of some interest...


*http://tinyurl.com/ytnehg*
** ** ** *http://tinyurl.com/2dfmks*

Regards,

Gordon.

Good work Gordon. A lot of work has be done recently as
many cars are now using traction drive auto transmission.

Paul Lamar ...No rotor no motor.

The Rotary Engine NewsLetter. Powered by Linux.
ACRE NL web site. http://www.rotaryeng.net
Copyright 1998-2006 All world wide rights reserved.