Repacking Tesla / SKF Rotor Hybrid Ceramic Bearings
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- čas přidán 6. 07. 2024
- In this episode, I Repack Tesla / SKF Rotor Hybrid Ceramic Bearings. Learn and do better :-)
You can buy small quantities of SKF LGHP 2 grease from me on Ebay:
www.ebay.com/itm/225191574480
Timestamps
0:00 intro; remove front seal from inner bearing
0:48 test if really hybrid ceramic
1:17 bearing inspection
2:27 removed front seal from outer bearing; inspection
2:50 removed back seal from outer bearing
3:19 cleaning
3:57 remove cage
4:52 bearing puller discussion
5:42 buy new bearings discussion
5:52 "repacking" discussion
6:15 cheap replacement bearing discussion
6:30 bearing identification
6:40 grease quantity determination
7:55 grease selection
8:36 repacking procedure
10:09 put seals back on; break in
12:00 grease offer
See also
sites.google.com/view/teslald...
www.myrav4ev.com
Disclaimer
This video is for entertainment purposes only. All work you do on your car is at your own risk.
Keywords
Toyota RAV4 2012 2013 2014 Mercedes B-class Electric Drive Tesla Model S large drive unit LDU motor BEV glycol coolant fluid Zerex G48 automatic transmission fluid ATF Dexron VI leak battery aegis ring bearing bearings grinding noise CAD model PTFE teflon rotary lip seal failure drain housing rotor shaft repair common mode grounding runout eccentricity fluting wear axial radial play speed sensor check rebuild assemble disassemble vent reluctor ring expensive cheap repair DIY out of warranty - Auta a dopravní prostředky
you have to use kluber nbu 15
Thanks
👍👍
To remove the bearing seal, go from the outer edge, any damage caused on that side is at least not a moving seal surface.
I dont know you expensive this bearings are but it is the equivalent to me like changing idler pulley thats broken and not the driving belt.
Hello, how did you remove the reluctor ring before the bearing?
I show that in one of my previous videos.
What’s about coolant seal 30x55x8 ?
See here about that seal: czcams.com/video/wwuJc5iBP2M/video.html
Please clarify, have you replaced the ceramic bearings with new ones or not?
No I re-used the old ones and I "repacked" them with fresh new grease.
@@diyEVguy Thanks for the answer!
One more question. In this motor, have you seen such a "brush!? Its condition? czcams.com/video/VW4_ICHFTM0/video.html
They are extremely expensive, unless the bearing is trashed and gritty I wouldn't replace it if the seals can be removed and reinstalled without damage.
@@FrozenHaxor Because of this, I would never trust you to repair my vehicle:
czcams.com/video/VW4_ICHFTM0/video.html
+ czcams.com/video/C8oxv7ILcHU/video.html
This rotor speed very high, for ceramic hybryd bearing you need spesial very expensive grease, skf lghp not for very high speed.
Sorry for my english)
Which specific grease would you recommend?
@@diyEVguyMaybe Kluber BF-7222.
@@diyEVguykluber nbu 15 or kluber 72 42
and also 7222
Yeah NBU 15 is very good @@spindlehospital5263
dont be a fool. buy bearings. they cost close to nothing.
Where to buy cheap?
I could imagine bearings for a motor like this wouldn't be cheap but not crazy expensive. Maybe $50 a pop
To be honest- this is rather shtty from Tesla. Ball bearings? In a day and age of cheap high precision roller bearings? Intolerable.
I'd swap the Tesla SKF with roller needle bearings.
I don't have experience in motor design. Do you happen to have references to designs examples with similar conditions as this motor where high precision roller bearings are shown to be a better choice? Also which needle bearings would you recommend?
@@diyEVguywell the examples are the many aircraft piston engines for example Mercedes Benz DB601-605 series in WW2. Look up DB601 +bearings '+cutaway you'll see a cutaway of crank to conrod bearing is roller bearings. Also the maybach powerpack for the various tanks had roller bearings.
You need to give me the bearing and number so I can cross reference it with an NSK or SKF chart or you can look up pedfs of SKF, Timken, NSK whoever you use spec charts. Efficiency improvement above 5% is possible- 5% more torque and power sound good enough for me to shell out for some proper bearings instead of the crud Tesla use.
Proofs:
"The roller bearing engine: A cost effective way to reduce fuel consumption" by Christof Tiemann, Markus Kalenborn, Kolja Orlowsky, Christoph Steffens & Werner Bick 1 April 2005 MTZ worldwide:
"Pure Efficiency: Developing combustion engines from the perspective of a supplier:" Dr Martin Scheidt & Matthias Lang
"Roller-Bearings in Combustion Engines - an Effective Way for .
"Evaluation of a Low Friction, High Efficiency roller Bearing Engine"- the Timken Compnay proj. mngr Charles W. (Skip) Shattuck
Conclusion: "The test results measured when the engine was powered by an external motor confirmed the results of earlier studies which showed that application of roller bearings to an ICE does reduce friction, although the 5-10% reduction was less than the amount seen in other studies."
"Crankpin Bearings in High Output Aircraft Piston Engines The Evolution of their Design and Loading" by Robert J. Raymond, July 2015 Aircraft Engine Historical Society
@@markiobook8639 The Tesla motor needs hybrid ceramic bearings (ceramic balls in metal races) due to the "common mode" voltages created by the variable frequency drive. Maybe ceramic balls were more widely available. Also the radial loads are relatively low and the speed is very high (>10,000RPM). From the perspective of load bearing capabilities, a line contact from needle bearings may not be needed.
@@diyEVguy You may be correct their I was wondering why ceramic bearings at all since it's not a high heat application- yes I think you may be right about insulation properties- perhaps metal bearings arc or have the potential to arc- no good for lithium battery packs.
No way, these "nano-ceramic" coated bearings are made to be non-conductive. The first non-conductive high-speed motor bearings ever created. At the speeds the Tesla motors are capable of, 16000+ rpm, It appears that high current arcing causes all other types of conductive bearings to fail.