Strange gearbox tooth pattern

[Sofistioelevib]

Hello Guys,
in attachments you found some photo about strange gearbox tooth pattern found. Before the inspection i made some vibration measurement on it discovered this:4

-1XM in axial 13,5 mm/s
-2XM in radial 16 mm/s
-1XGMF 2mm/s

THis machine is forming roll in a papaer machine (MOTOR-PENDULUM GEAR-CILYNDER).
All of your consideration about tooth pattern will be helpfull.

Regards

 

[electricpete]

It beats me. If you don't get response here, try forum406

=====================================
(2B)+(2B)' ?

 

[IRstuff]

What exactly do you think is strange? You posted a number of photographs, but expect people to guess at your problem.

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert!

https://www.youtube.com/watch?v=BKorP55Aqvg

faq731-376 forum1529 Entire Forum list

http://www.eng-tips.com/forumlist.cfm

 

[Strong]

I have seen this pattern (especially last phot) with greater wear spots at end of teeth caused by a gear natural frequency (confirmed by impact test) where the vibration mode was a wobble of the larger (bull) gear.

Walt

 

[Strong]

Your Welcome for Thanks or feedback in advance!

Walt

 

[kaarthicsakthi]

Hi,

Based on the contact pattern, i would recommend you to check for the axial play in the bearing. I hope the gear is mounted on a set of taper roller bearings. Kindly ensure that the pre-loading in the taper roller bearings are fine. I hope that this should solve the problem. Further, I feel that there has been an initiation of micro pitting in the gear flank. Kindly check for the viscosity of the oil and also for the presence of any abrasive/metal particles in the lubrication oil.

Regards

K.Kaarthic

 

[mfgenggear]

it appears from the photos the helical pinion has excessive wear,
some suggestions
attach a magnetic base with a dial indicator on ground surface, and look for excessive runout.
could be a worn bearing , or miss alignment.
a rebuild of this gear box is required, the pinion gear is worn.
the vibration is the teeth interfering causing excessive wear.

a full failure analysis will be required, a qualified engineer or technician or both, will have to
tear down the box and document and take pictures of each component.
document were and how the failure occurred.

 

[Strong]

Apparently the OP is not interested, since it was posted Feb-11.

Walt