Neil,
Some of us are seeing shaft wear in the thrust bearing stack. The 1mm thrust washer between the needle bearings is the source. The two outside thrust washers are 3mm and show no signs of wear. Upsizing the 1mm washer to a 3mm would likely prevent the shaft wear issue. This could easily be done if machining new shafts. Existing shafts could be modified if too much material was not removed from the gear for pin installation. Reordering the bearing stack and placing the 1mm washer against the aluminum plate does not work because the 1mm washer will not capture on the shaft during assembly.
Bobby Hughes
Sent from my iPad
Charlie and Bill, yes tracy used two needle thrust bearings as I
have, but in practice there is nothing to hold the thrust washers
either side of the two bearings. I just worry about that, but
tracy's Box has done thousands of collective hours, so I possibly
should throw my worry beads away. Thanks Neil.
On 8/6/2017 4:10 AM, Charlie England
wrote:
Neil,
If you're looking for the Mazda transmission input shaft bearing,
here's a page from the parts manual. If you need the entire
manual, email me at ceengland7@gmail.com & I'll send you the
pdf.
Charlie
On 8/5/2017 11:29 AM, Charlie England wrote:
I think those are the thrust bearings, to
handle the thrust of the helical gears in the planetary gearset.
Is that what Neil's asking about?
On 8/5/2017 9:51 AM, Bill Schertz wrote:
I believe that Tracy's gearbox uses a
stack of needle bearings to lower the rpm of each bearing to a
better value
Bill Schertz
-----Original Message----- From: Neil Unger
Sent: Friday, August 04, 2017 11:54 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] bearing in mazda g/box
Gents, I have suddenly realised that the main bearing on the
Mazda
g/box input shaft would have to take 8/9000 RPM. In my search
most
bearings give out at 6,000 RPM. Does anyone know just what
bearing they
use? Perhaps the number??  I realise i am the optimist.
Thanks Neil.
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