high temperature cushions

[albertos]

Good morning to all,
I would need information on high temperature bearings, such as suffixes, what kind of fat and what kind of seal is provided? 2rs rigid radial ball bearings that ahimè last very little fat loses efficiency and later grip,
Any advice?
Thank you.
tree

 

[MBT]

define what you mean "high temperature".... I mean by high I mean 1600°

Anyway... I would say so on two feet...
verify mating games and interference
use bearings with game increased c3 or c4
use bearings without seals 2rs but at maximum 2z.
better yet to predict a fattening plant
if the temperature is excessive... pass to the bronzine!

 

[albertos]

the maximum operating temperature for a standard 2rs ball bearing is of the order of 120 140 degrees, in this ahimè machine for successive modifications has increased the power of the transmission and the bearing is solicited a lot, its housing is right under the pulley so nn manages to dissipate the heat and indeed the heat of the transmission to belts is very important stimo, as that you arrive to horse of the 200° 250° degrees.
lubrication must be fat

 

[cacciatorino]

the maximum operating temperature for a standard 2rs ball bearing is of the order of 120 140 degrees, in this ahimè machine for successive modifications has increased the power of the transmission and the bearing is solicited a lot, its housing is right under the pulley so nn manages to dissipate the heat and indeed the heat of the transmission to belts is very important stimo, as that you arrive to horse of the 200° 250° degrees.
lubrication must be fat

Check that there are no alignment problems on the two extremities, sometimes overheating depends on that, in case you can use the adjustable ones.
What diameter of the tree? How many turns/minute? If the speed is high, try to put a fan on the pulley that shoots air on the stand, maybe you can keep it a little cooler.
But if the bearing fails, how long do you last?

 

[albertos]

the straps last little too but they are easy to replace, they are 5 spz3v, on a pulley of ø190, I was thinking to move to polyv straps should have a greater yield in terms of yield and heat produced.
alignment is perfect the group has a tolerance of 2 cents on the axis

 

[cacciatorino]

I was thinking of switching to polyv straps should have a greater yield in terms of yield and heat produced.

that surely, perhaps even better the htds that make you reduce the initial tension, always if you are in it with the power to transmit.

 

[MBT]

Sorry to object. . .
By reading the "history" of the project, I can think that under load the tree shoves, working badly the bearing that then overheats and yields.
idem for straps.
you read five cents, but an exhaust axis. . .

Try it, it doesn't cost you much.
change the straps and put those dentate synchronous, increasing, if you can, the diameter pulleys.

should reduce the radial load and improve the working condition.

 

[sampom]

Sorry to object. . .
.

Yes, I also apologize for my objection:biggrin:
for high temperature means the environment in which the bearing works, not the temperature produced by the bearing itself (clear that at the end "compartecipano").
the bearings are designed to withstand under a certain load at a certain nr rpm (.. I don't think you reach that limit; but if you tell us that speed and where it works is pulleys..) for those project temps you were talking about (about 120°).
if there are excessive increases of "mechanical/localized" temp evidently can be due to errors of calculation-size-building-mounting. of course an excessive pretension is not good, but also here if you are forced to this "tiro" to ensure the transmission is always the fault of the basic dimensioning... He's a dog who bites his tail.
I would see everything a bit (if possible. . )

greetings
Marco:smile:

 

[albertos]

flessioni e disallineamenti are to be discarded, I spoke with the technicians skf the problem is to attribute to the 2rs seals that already from 80 degrees let trafilare the fat, and this leads after the grip of the bearing, as said. the bearing is well sized but does not dissipate the heat because of the pulley housed immediately above which heats similarly hanged by the transmission of such power. the right co-promise I think is to replace the type of transmissive to avoid slipping and replace the type of seals prescribed