Go Back   986 Forum - for Porsche Boxster & Cayman Owners > Porsche Boxster & Cayman Forums > Performance and Technical chat

Reply
 
LinkBack Thread Tools Display Modes
Old 04-04-2015, 02:46 AM   #1
Registered User
 
Join Date: Jun 2014
Location: LB, Germany
Posts: 1,322
IMS bearings

So i did a little research on 6204 bearings.

There are a lot of different types from different manufactureres out there. So i needed to know more details and found a very good introduction on roller bearings from NSK. Maybe it is also available in english, but i couldn't find.

http://www.tmh-at.de/downloads/files/nsk/Hauptkatalog_-_Waelzlager_-_PDF_-_Teil_A.pdf
http://www.tmh-at.de/downloads/files/nsk/Hauptkatalog_-_Waelzlager_-_PDF_-_Teil_B.pdf
http://www.tmh-at.de/downloads/files/nsk/Hauptkatalog_-_Waelzlager_-_PDF_-_Teil_C.pdf

English infos i found (not the same as above):
Rolling Bearing Catalog Technical Information | NSK

Regards Markus
Smallblock454 is offline   Reply With Quote
Old 04-04-2015, 10:19 AM   #2
Registered User
 
Join Date: May 2014
Location: S.California
Posts: 2,011
Excellent resource Markus ! Thank you.
This should go in a Sticky(?) because it would answer many of the goofy questions - like axial as opposed to radial load:
http://nskeurope.com/cps/rde/xbcr/na_en/Selection_of_Bearing_Type.pdf
and misalignment.
One geekish subject that has puzzled me is how relevant the precision of the bearing is for our bearing selection.
Is ABEC 7 'better' than ABEC 5 for the IMSB ? Yes, I know there are ISO and DIN ratings of precision in bearings but their scales are too confusing.
Perhaps the ball & cage material(Si3N4 +chrome) are more important ?A bearing like this won't be a utilty grade level of precision -surely it would be at least ABEC 7?
6204-2RS Hybrid Ceramic Sealed Bearing 20x47x14 Ball Bearings 20mm
Note the one review is by "James -for a 996 in Canada"
Gelbster is offline   Reply With Quote
Old 04-05-2015, 04:12 AM   #3
Registered User
 
Join Date: Jun 2014
Location: LB, Germany
Posts: 1,322
Hi,

there are also similar DIN and ISO norms that mean the same. Please take a look at the table: ABEC

I don't know if the ABEC is a most important factor for an IMS bearing. I think there are much more important factors like:
max rpm capacity
static load rating
dynamic load rating
maximum play
axial loadability
materials
type of sealing

Whereas i have to do more research to get into it. Also i have to research what kind of bearing exacty the Prosche IMS bearing is and why they used that type of bearing.

Regards Markus

Last edited by Smallblock454; 04-05-2015 at 04:20 AM.
Smallblock454 is offline   Reply With Quote
Old 04-05-2015, 09:06 AM   #4
Registered User
 
Join Date: May 2014
Location: S.California
Posts: 2,011
Markus,
These people may help you?
Our product range - Deep groove ball bearings - Deep groove ball bearings 62.. · SBN Wälzlager Gmbh & Co. KG, Bearings, Miniature ball bearings, Deep groove ball bearings, Self-aligning ball bearings, Thin section bearings
or :
Ball Bearing Angular Contact S 6204 E TA | GMN Bearings
Viton sealed bearings(remove 1 seal) seem rare.
An alternative - to reduce the consequences of the Buna inner seal from heat degradation may be to use a steel shielded bearing -6204 Z ? Yes, I know there is a Buna seal inside the metal shield of the ZZ bearing but it would be a little better than just the common 6204 -2RS hybrid bearing?
Gelbster is offline   Reply With Quote
Old 04-13-2015, 01:38 PM   #5
Registered User
 
Join Date: Jun 2014
Location: LB, Germany
Posts: 1,322
Hi Gelbster,

thanks for the links. Sorry, at the moment i have no spare time to tinker with the bearing topic. So just read a little bit.

There are also sealed 6204 bearings that are proved under vacuum conditions. Because of the over - underpressure in the ims tube on different situations this might be an interesting option. Will do a research, but at the moment there's no time to do it.

Markus
Smallblock454 is offline   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -8. The time now is 12:30 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page