Paul,
   I understand where you were going with the aluminum carrier. Any
   misalignment greater than the aluminum housing would allow would
   probably be destructive to the gear set. (Don't think Vance's ounce of
   rubber even applies in this case.)I believe the Timken system was of
   course designed around their tapered roller bearings. I have always
   believed these to be one of the best rolling element bearings in the
   world, but they aren't always available in the smaller sizes we need.
   Prop shaft, no problem but planets is another story. I would love to see
   a herringbone gear set become available in our sizes too, but spur gears
   is probably the best we can hope for!
   Bill Jepson

   I think the ounce of rubber applies. Planetary gear sets are largely
   self
   aligning. Not only the angle of the gear but the radial position of the
   planet gear. If you constrain them too much then you get high point
   contact
   stress concentrations. You just have to keep the planet gears from
   interfering with each other that's all.

   Paul Lamar ...No rotor no motor.

   Paul,
   I don't think that the planets can have that rubber sleeve if the drive
   is being taken from the planet carrier as it is in the 2.85:1 units. If
   they are driving the ring gear maybe...
   Bill


   Well the Ford planet carrier is straddle mounted pins so the
   load goes into both ends of the pin more or less equally and
   thence into the planet carrier and thence into the prop shaft.

   There is no doubt a self aligning spherical bearing such as the
   Timken could
   do a better job of equalizing the loads from the planet gear going
   into the pin instead of needle rollers.

   Here is small bearing that works the same way almost.

   The smallest Timken is about one inch or 25 MM bore.
   --
   Paul Lamar ...No rotor no motor.

   ---------------------------

   BTW to get the same theoretical load ratings we have now you would need
   four narrow (1/4 inch)  pinion gears and these spherical ball
   bearings per pin
   for a total of 24 bearings and pinion gears. We would have to scale
   it up
   as a 1/4 inch pinion shaft is not going to hack it. Going fast cost
   money. How fast do you want to go ? :)

   No beating needle bearings for a compact design.

   Paul Lamar ...No rotor no motor.

Does anybody on here have an FEA program that they are somewhat
proficient using?  In my mind, I have an image of how the sun gear
deforms under load in a planetary set and I think it would be
interesting to have that simulated..


Regards,

Matt-

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