Bearing Housing Bore Accuracy

Have you ever heard of punctuation?

please describe punchuation thnks

Hello Guest

My attempt at correcting the grammar and adding punctuation is below. In some places I've had to make assumption about what the OP means. Is the 0.35mm clearance radial or horizontal? Appears to refer to both but it's so jumbled up it's difficult to tell.

I have a pump for cooling tower. The pump is double suction type, with shaft supported between double spherical roller bearings, No 23330. The bearing housing bore has worn out. Now the outer race of the bearing has .35 mm clearance in the housing. Pump shaft is horizontal. Material of both halves of the housing is cast iron. We have no new bearing housing. Kindly suggest the solution.

Regards for all

Trust this helps.......Codey

I would talk to somebody from a machine shop. I mean, a traditional repair for a worn housing bore is to use some material (possibly weld, maybe metal flame spraying, maybe something else) to build up the bore again, and then have it rebored.

(I'm more use to having this done in something that is a one piece housing around the bore, but I'm guessing that the same type of machine that created the bore in the first place can rebore it.)

my dear

is it sufficient to weld the housing partially like 20mm wide welding layer along the xis of shaft distance between every layer 100mm and then machine it according to require bore dia meter or complete welding is necessary regards

Talk to somebody from a machine shop.

Why this wear ?

Normally under correct usage conditions this should not happen. If you do not know why then you can expect same after repair.

Most likely the bearing's outer ring spun in housing causing the wear. You can "dimple" the surface with a punch and then use a product such as Loctite Quickmetal when reassembling the unit. Be sure the bearing cap is properly torqued to specs and the mating surfaces are clean. Get a bearing book from somebody like SKF and review the mounting and fitting practices especially concerning a fixed vs expansion application. Use oil for lube not grease. Ed

it was happen due to broken impeller that generate high vibration

There are a few ways to solve the problem, according with my experience:

1) Machining bearing housing (b. h.) to a bigger diameter, and fabricate a fit-ring for the bearing in order to fit Outside Diameter of bearing with new Inside Diameter of b. h. seat diameter. For ring, use SAE 1045 or SAE 4140 steels. Possibility of success depends on bearin housing configuration (if it is possible to put in a turning machine, etc.). Shrink fitting for ring and new b. h. seat should be selected from standadrs.

2) Ensure the seat at b. h. keeps it´s circumference-shape (no ovalization), using a proper instrument, measure seat diameter, and fabricate a bushing to replace the bearing. Same comment than above for shrink fitting. Possibilities of success depends on shaft speed and lubrication media.

3) No matter the solution you choose, please, urgently order the required spare parts, since any other solution different than change worn parts for new ones, are TEMPORARY SOLUTION ONLY.

Regards!!!

Jorge Brizuela

my dear

bearing housing is in two parts horizontal split how i can fit shrink ring regards

Just see technical info about bearing housing in the proper bearing housing manual. Have you seen soething like that before?.

my dear i am send u the pic of housing we weld it partially after welding we will machine it is it a good solution if yes why ? if not why ? regards

Yes, it is also a good solution. Is the equivalento do make a fit-ring. So you found a way to machine a bearing housing. look for the original I. D. in te manual before machining. Ensure I. D. !!!!!

hi

welding like this is not good because bearing outer ring need plane ground surface for supporting the outer ring it could be the cause of deformation of outer race path of rollers i think there is one solution in my mind machine the matching surfaces of both halve upper half by .2mm and lower half .3 mm then assemble the bearing housing and tight it with proper torque and machine it according to your required size if you have machining facility and fit the housing with pump casing according to pump centerline and dowel it with pump casing

best of luck

Between these welds you can put some cold weld compound also, which can be machined(like BELZONA OR TITANIUM PUTTY ETC.). This will improve surface contact for the bearings..

Hi, Arshad!

By now, surely you have already solved the problem. Please, tell all of us which was the choosen solution and the result of applying it. And let me remember that no matter the solution, you have to install new parts as soon as possible.

Regards!!!

Jorge

I've seen the recommendation to install new parts as soon as possible in more than one post here, and I'm questioning that.

When I worked in coal mining, the bearing bores in various equipment (I'm trying to remember if pumps (housings) were included) was repaired by building up with weld material and then reboring.

This was typically an (in house) shop repair. For most equipment, we had spares. When something was taken out of service, the spare was put in service, and the piece taken out of service was taken to the shop for rebuild. (Sometimes it was determined that rebuild was not (economically) feasible, but otherwise, the rebuilt equipment became the new spare and was but back in service when required.

I don't think new is always required. Comments?

For short time solutions, bearing manufacturer like SKF and FAG have developed some corrugated type of strips which can be inserted in the bearing housing after making under cut for the width of the strips and then bearings are fitted. Those strip's corrugation makes up the under-size of the housing. Same type of strips are suggested for Inner race also to be used on shafts after making under cuts.

Good advice, please tell how to find some info regarding those strips. I didn´t know about them before!!!!

These are called tolerance rings. you can find details on links as below:

http://www.bearings.saint-gobain.com/rencol-tolerance-rings.aspx

http://www.euro-bearings.com/TOLRINGS.pdf

Thank you very much for this info.

A clearance of 0.35 mm for housing is very high and can not work in such a condition. You have to machine this housing insert a sleeve of compatible material and finish bearing housing ID = OD of bearing with tolerance class K5/M4 that is + 0.003 or -0.016 mm (Applicable for bearing OD size between 250~400 mm).

If you dont have machining facilities then must buy a new bearing housing and replace the worn one.

dear plz read no 13

You may temporary use appropiate gage shim to pack it if there is slippage.