Bearing interference fit question
Bearing interference fit question
(OP)
I have a bearing with a 80.000mm OD.
I am machining a housing from 1018 steel that the bearing will go in.
There is enough load and stress on the bearing that I believe it needs and interference fit.
The bearing will be pressed in until it seats against a lip. Then a snap ring will go in place so it can not back out.
My only real question is how much of an interference fit do I need?
I am machining a housing from 1018 steel that the bearing will go in.
There is enough load and stress on the bearing that I believe it needs and interference fit.
The bearing will be pressed in until it seats against a lip. Then a snap ring will go in place so it can not back out.
My only real question is how much of an interference fit do I need?





RE: Bearing interference fit question
The technical/engineering section will tell you exactly.
Mike Halloran
Pembroke Pines, FL, USA
RE: Bearing interference fit question
Johnny Pellin
RE: Bearing interference fit question
The part number according to Timken's site is 513180.
I am unable to find that part number in any of their PDF files in relation to engineering references and tolerances.
The bearing is being used in an automotive wheel bearing application.
As such, the "shaft" in this instance consists of a hub and a CV flange that bolt tightly through the center of the bearing.
And the bearing is mounted in the spindle.
I will continue to look but I am not having too much luck.
RE: Bearing interference fit question
p118 or thereabouts
See how much easier it is when you tell us what is going on- engineers not being famously telepathic.
Only problem is that the desired fit in reality is a function of the location of the bearings axially, and heat buildup, and materials. In practice ones I have developed have tended towards /very/ light press fits or sliding fits.
Cheers
Greg Locock
I rarely exceed 1.79 x 10^12 furlongs per fortnight
RE: Bearing interference fit question
Johnny Pellin
RE: Bearing interference fit question
So I just picked the fit that most closely matches my bearing type and size with a fixed housing and a rotating shaft.
The info I am going with is on page 128
ht
The numbers for the 79.969mm bearing is what I will use.
I don't know what else to do if no one else can give me a better idea.
RE: Bearing interference fit question
Using the fits for a ball bearing when you have a taper roller seems a bit odd, particularly when the table I pointed you at is for taper rollers used as hub bearings.
A cursory glance suggest you should be 2 thou interference on the shaft and 1.5 to 3 thou loose on the housing. pages A119 and A120, 3 to 5 inch, rear wheel column.
Those figures are in line with my experience.
Cheers
Greg Locock
I rarely exceed 1.79 x 10^12 furlongs per fortnight
RE: Bearing interference fit question
Johnny Pellin
RE: Bearing interference fit question
Cheers
Greg Locock
I rarely exceed 1.79 x 10^12 furlongs per fortnight
RE: Bearing interference fit question
It is a two row ball bearing.
h
I think the table suggest +0.0000 -0.0003 for the 3.1495 bore which will make it a M7 tight fit.
RE: Bearing interference fit question
OK, I'd call that a Gen 1 hub unit. If the internal geometry is similar to what I am used to then a press fit is the usual solution.
However the unit I use was designed 20 years later than that one, and may have completely different constraints.
Cheers
Greg Locock
I rarely exceed 1.79 x 10^12 furlongs per fortnight
RE: Bearing interference fit question
http://www
Beat to fit, paint to match.
RE: Bearing interference fit question
RE: Bearing interference fit question
RE: Bearing interference fit question
Besides the fit on that duplex angular contact ball bearing OD, you must also consider the ID fit. The bearing OD should have a slight interference fit at RT with a steel housing. The inners should also have an interference fit on the shaft, in order to prevent fretting.
However, the interference fits of both the races should not produce a condition where the internal clearances of the installed bearing are reduced below acceptable limits.
Regards,
Terry
RE: Bearing interference fit question
we stuck with the +0.0000 -0.0003.
For references sake I believe this is real close to a class M7 fit which is not considered an interference fit but rather a press fit.
I have not actually put the bearings in yet because there is still some more parts that need to be made and welded to my bearing housing which may present it's own set of problems.
The "shaft" that I am using is actually a factory Porsche part
so I won't have to machine any of that stuff.