X-Mozilla-Keys:                                                                                 
Vance Jaqua wrote:

One last stake for belt PSRU.... If we eliminate

the rpm limitation on the

pulley that leaves us with an unescapable one. 

The centrifugal force on the

belt at that rpm is going to mean that there is

little rated hp left over to

actually transmit force from one shaft to another.

 This is unfortunate

since belt drives are cheap, efficient, and loud.

( oh wait)  What if we

made our own gear box from stock parts from a gear

guy?

Good question. Arrow Gear may have some usable stock
parts.

Paul Lamar

The gear sets that the race car guys use for their
quick change rear ends are sturdy and cheap (watch
those big fuel burning V8 dirt cars on a rough track
if you want to see driveline punishment). The gear
pair is probably lower cost than a pulley set, tho you
would need two sets to compound for the ratios the
rotary needs, and they have to be mounted more
carefully and lubricated. Vance

Yes.

The box and bearings are heavy because the gears are trying 
to push themselves apart. You can't beat a stright cut 
planetary as the loads are internal to the ring gear.

Unfortunately the Ford C6 planetary is helical
so thrust bearings are required. Perhaps truck
versions are stright cut as noise is less of a
consideration. The PT6 box looks like stright cut.

Paul Lamar
 
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