Oil film between rollers in full complement bearing
Oil film between rollers in full complement bearing
(OP)
Would anyone be able to direct me to references on the topic of calculating the lubrication characteristics in full complement roller bearings, with particular reference to the oil film thickness between the counter-rotating surfaces at rolling element contact.
The application involves a planet bearing in which the rolling elements experience varying accelerations up to 130 g, particularly due to the centrifugal and coriolis effects. This leads to tangential forces - i.e. between adjacent rollers.
While some bearing manufacturers recommend full-complement bearings in planetary systems, there are also recommendations to avoid them in cases where significan roller-to-roller loads can be generated, and in high speed applications.
Basically I would like to be able to verify the concerns with some calculations. Papers with specifics on the first principle calcs seem to be hard to come by.
Any pointers would be appreciated.
With thanks
Francis
The application involves a planet bearing in which the rolling elements experience varying accelerations up to 130 g, particularly due to the centrifugal and coriolis effects. This leads to tangential forces - i.e. between adjacent rollers.
While some bearing manufacturers recommend full-complement bearings in planetary systems, there are also recommendations to avoid them in cases where significan roller-to-roller loads can be generated, and in high speed applications.
Basically I would like to be able to verify the concerns with some calculations. Papers with specifics on the first principle calcs seem to be hard to come by.
Any pointers would be appreciated.
With thanks
Francis





RE: Oil film between rollers in full complement bearing
There is also a previous version.
RE: Oil film between rollers in full complement bearing
Anything online specific to this problem?
With thanks
Francis
RE: Oil film between rollers in full complement bearing
heavy loads and high speeds is
that the adjacent rollers surfaces
turn in opposite directions with
respect to each other thus magnifying
the problems. That is why they
use cages in these bearings or at
least rocommend them.
RE: Oil film between rollers in full complement bearing
Anybody got the equations somewhere for reference? Have there been any papers on this application (full-complement roller bearings with loads between rolling elements due to the centrifugal and coriolis accelerations introduced by the planet motion)?
Francis
RE: Oil film between rollers in full complement bearing
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RE: Oil film between rollers in full complement bearing
RE: Oil film between rollers in full complement bearing
RE: Oil film between rollers in full complement bearing
RE: Oil film between rollers in full complement bearing
RE: Oil film between rollers in full complement bearing
RE: Oil film between rollers in full complement bearing
Whatever the relative speed between the two objects you are trying to build a film between you need a route to get oil into that contact. A classic journal (plain bearing) gives that (like in some areas of the cage contacts) in the form of the characteristic wedge.
In the case of a full complement bearing the rollers touching one another have a surface velocity in opposite directions, which does not entrain oil. In fact quite the opposite - oil is swept out of the contact. Despite giving a high relative velocity, good film formation will not occur.
RE: Oil film between rollers in full complement bearing
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