locking and choosing bearings on pre-existing configuration

[Marcuz1990]

Good morning to all, I would have a question to ask you:
as you can see from attached design the section of a small compressor connected to an elastic joint in turn poked on the electric motor shaft of which I represented the encumbrances in orange.
the compressor shaft (green) is screwed on a threaded bushing, which in turn is calettata for interference on the braced bearing (carved for interference on the flange quarry).
between the bushing and the shoulder of the tree are housed twins and counterweights to "pack" while between the other braces and the left counterweight I placed a spacer that should prevent the exit (although the bearing is mounted for interference).
Unfortunately I cannot change the left flange because it was shipped with the car otherwise I would have increased the depth of the dig and put the seeger quarry as on the right flange.
the choice to place another bearing on the left quarry (before it was not) is due to the fact that it touches counterbalance the disalignments given by the elastic joint (the one represented in light grey at the level of ingots).
my colleagues wanted to put a radial bearing, however I opted for a "x" configuration of two braces since the radial loads are not too high and also the elastic joint does not have, from the catalog, an excessive axial excursion.
It takes me only doubt about the safety of putting a spacer (in purple). Can it be enough to prevent the outflow of the bearing without "sbrindelli" all?
Do you have any advice to give me to make this work without going to touch the right flange (and possibly the other components too)?
Consider that these machines must have a continuous operation, therefore a very high fatigue.
Thank you very much

 

[stevie]

that spacer how it is bound to the tree?
Is it cianfrinate? for friction?
Why don't you block the outer ring of the bearing with a screwed flangetta?
I am not back then the configuration of oblique contact bearings (I am not mounted axial).
to work properly they need preload and I don't think in your scheme there is.

 

[Marcuz1990]

that spacer how it is bound to the tree?
Is it cianfrinate? for friction?
Why don't you block the outer ring of the bearing with a screwed flangetta?
I am not back then the configuration of oblique contact bearings (I am not mounted axial).
to work properly they need preload and I don't think in your scheme there is.

Hello, is bound by friction
Where should I spot the flangetta?

 

[Marco F inox]

I agree on the uselessness and inefficiency of these two bearings, even because in such a mechanism, there are no axial forces to consider, but the parcel of the elements must be blocked axially, precisely, even with thicknesses.
the green tree then, must be held firm with two shoulders, left with the purple ring, which was obtained on the tree and right with a shouldering left of the bearing, obtained on the threaded bushing.
you can not rely on the only fittings with interference, because sooner or later they give up and do not maintain the position.
It should then be remembered that a bearing should not be mounted with interference on both rings.
In this case, as all loads act on the turning shaft, the inner ring of the bearings will be blocked on the shaft itself.
fundamental rule that must also ensure the disassembly of the details.

 

[TETRASTORE]

It seems to me that it is a product already built (of which some parts have already been shipped) so that it is involved with the least possible modifications on the components already worked.
I suggest that the mounting of the bearings with interference both on the inner ring and the external one is admitted, but must be justified by particular application needs and in the design field must consider various factors such as vibrations, operating temperature, interference values, loads, surface finishing of the seats, etc. as you can see here.
in your case you can mount both radial and oblique bearings even if the seconds, in the absence of axial loads, would not be necessary.
the oblique bearings, as you have already been indicated, to perform their function properly must be subject to a preload that, in your scheme, is not applicable due to the forced assembly of all internal and external ralles.
by staying your scheme you may intervene as follows:
1) the left flange has already been shipped so I assume that the bearing seat has already been planned for a fitting with interference: Okay.
2) the shaft must be inserted from the right, so it is necessary to make a pre-assembly of the various components starting from the central ones, then the threaded bushing, d2 spacer and internal bearing ring c2 (mounted with interference or with j6 coupling on the shaft), then the lock is rotated and, on the opposite side the d1 spacer and, to beat against it, the internal rall of the bearing c1 (also).
3) if it has not already been done, on the flange on the left you mount the outer ring of the c1 bearing and the ball crown, then stick the tree with all the preassembled components;
4) closes with the right flange with external ring bearing d2 and seeger dis2 preassembled; Careful! the outer ring of the d2 bearing should not be mounted with interference but the seat on the flange should be worked in h7 to allow the application of preload to the bearings; (if this is not possible, the thickness between the ring and the seeger must be inserted during the assembly phase on the flange, but the recording must be carried out with additional thickness to be applied on the right flange bar).
5) using thicknesses between the seeger s2 and the outer ring of the c2 bearing applies the preload provided for the proper functioning of the oblique bearings.
In this way you would be fine with two spacers and a simple rework of the bearing seat on the right flange. Note: the outer diameter of the spacers must be lower than the diameter of the inner ring of the bearings to allow the extraction of the latter in case of maintenance.

is due to the fact that it touches counterbalance the disalignments given by the elastic joint

It seems strange to me that the disalignments are caused by the elastic joint whose function is usually to cancel them. I would rather verify the concentricity of the bushing mounted on the shaft through threaded connection, coupling that would require a cylindrical drive tract; from the image it is not understood if the small step to the left of the thread has this purpose.

 

[Marco F inox]

wide and clear description of the installation, with many details to consider.
However if the two blue spacers are not solidarity, one with the shaft and the other with the outside of the threaded bushing, the shaft is free to parade to the left.
to rotate freely, the shaft must be in contact only with the two inner rings of the bearings.
the capillary patting of the internal organs to the two bearings, is not enough when the shaft is free to flow into it.
That's why I suggested that the spacer left was to be made on the tree (or solidified), while that of dx was to be obtained on the outside of the threaded bushing (or solidified).

 

[TETRASTORE]

However if the two blue spacers are not solidarity, one with the shaft and the other with the outside of the threaded bushing, the shaft is free to parade to the left.

if I have understood the design placed by the user, the tree cannot parade to the left as it is held by the threaded bushing that rotates along with the tree and that closes to "pack" the biella and the counterweights (also solidarity with the tree); in this way the whole set presses against the d1 spacer and consequently the inner ring of the c1 bearing (to oblique spheres) which blocks the axial shift.
in the attached image I highlighted the group of components solidarity with the tree.

that's why I suggested that the left spacer was to be made on the tree (or solidified), while that of dx was to be obtained on the outside of the threaded bushing

If the components were still to build your solution would be preferable.

 

[meccanicamg]

looking at the drawings there is some bearing that penetrates the biella. we hope that it is in model loading error and that it does not really have those problems.
with all the possible mounts, that do all the competition.... this is really the worst ever seen.
There's nothing to do to fix those pieces. as you have been told are all surgeries, precision and risk to throw everything away.
What does your boss say? But is it the first you do?