Fred Osborn wrote:

Paul,

I understand that the rear journal e-shaft bearing

is not suitable

for the side load imposed by a cog belt drive. For

a single rotor

engine how about a needle bearing which would run

between the

e-shaft and a reworked or redesigned rear

synchronizing gear

replacement part. Could that arrangement provide

an adequate

side load capability? Rotor sync would be

maintained by the front

sync gear.

Fred Osborn

Ken Welter uses an outboard support bearing with
simple oiler.
Needle bearings have severe RPM limitations. I would
use a precision
ball bearing in that application.

Paul Lamar

Kevin Richey wrote:

Does Mazda use a ball bearing for the eccentric shaft
lobes?

Kevin

Ball and roller bearings are not as good as plain bearings for high RPM.
Not much choice in a PSRU unless you want to use engine oil pressure
like Tracy does for some of the bearings. Problem is centrifugal forces
tend to cause the balls to move outward and slide on the inner race.
The high speed machine tools and turbo chargers get around this by using 
low density silicon nitride balls. Same stuff they make ceramic apex seals
out of.

Paul Lamar
 
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