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Rotating Gearing Wheels in Geared Motor

12/17/2010 9:19 AM

Hello, we have a BAUER geared motor model D4410AV / 206K.

The gear has an output shaft diameter 65 mm, it is over 40 years old, but has always worked fine.

Now the electrical motor has burned because grease from the gearbox has entered the motor house and windings.

We are going to replace the sealing "Zimmerring" between the motorhouse and the gear house. The motor will also be rewinded.

We also want to replace the bearings inside the gear.

New gearing wheels are no longer available.

When we opened the gear house and took out the gearing wheels, we saw that the gear has always turned in one direction, one side of the teeth on the gearing wheels is still like new, on the other side of the teeth you see some wear.

Some gearing wheels have symmetrical dimensions, this means that we could rotated the gearing wheel over 180° and put it back in position.

In this situation, the unused side of the teeth will be used, but these teeth will turn against the used teeth of the mating gearing wheel.

Unfortunately the mating wheel can't be rotated.

What will be the better solution. remounting the gearing wheels with the weared teeth against each other or rotating the single wheels if this is possible.

Who has some experience with this kind of problems ?

most regards

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Guru

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#1

Re: Rotating gearing wheels in geared motor

12/17/2010 9:55 AM

Here's my opinion. It is not the result of having direct experience with 40 year old gears.

Leave the gears as they are now. If, after 40 years of service you see "some" wear, only, why change anything?

I believe that you will cause more wear on the gear which cannot be changed by introducing a "new" surface which will have to "wear in" to the old surface. This will cause unnecessary wear on the old gear.

Do not reverse the gear.

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Guru

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#2
In reply to #1

Re: Rotating gearing wheels in geared motor

12/17/2010 11:37 PM

My feeling (not imperical data) tells me LynLynch is right. Since the teeth have be "working against each other for 40 years, they should be well polished and offer smoother contact with each other. Switching the mated surface on only one side might cause an accelerated wear until the un-worn face gets worn to mate with the used face.

If it has run well for 40 years it might be good for another 40 years. I have seen 80 year gears in good shape. As long as they are well lubricated and lightly loaded, they should run for a long time.

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#3

Re: Rotating Gearing Wheels in Geared Motor

12/18/2010 5:18 AM

I would start looking for a (modern) replacement.....

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Anonymous Poster
#4

Re: Rotating Gearing Wheels in Geared Motor

12/18/2010 1:21 PM

yes leave the gearset alone, proper wear in has been proven, reversing anything will destroy 40 years of break-in and poilish, proper lube and loading will give another 40 years, if it does not you will not kick yourself for screwing it up by messing with it, some gearsets will never be replaced with newer junk from china or other cheap manufacturer,

I have seen some gearsets in older lathes and milling/planing machines from 1900's working fine, all that is needed is someone who can pour and work babbit bearings for them,Sincerely
Mitch retired peugeot mechanic

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Andy Germany (1); Anonymous Poster (1); lyn (1); Ried (1)

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