Ball bearing seals 1

[bluesman0007]

Hello everyone,

We have a customer that uses brand X double row bearing 60mm x 110mm in a section of a roll straightener. We are required to repair or rebuild this part that houses the aforementioned bearing. When we inspect this bearing it is normally in excellent condition with the exception of the metal/rubber seal. We have asked the bearing manufacturer if we could buy replacement seals and we were told no. You need to buy a complete bearing assembly. This seal pops out and back in without the use of any special tools. I was told by a distributor that they knew of no bearing manufacturer that would sell us seals only. Am I beating a dead horse? Thanks in advance for any help.

Dennis

SolidWorks 2006 SP4.0
Windows XP Pro, Pentium4 3.00GHz
1.5 GB RAM, Matrox P650
Logitech Marble Mouse, CADMAN

 

[alexit]

No manufacturer I know of sells just the seals. Usually when the seals fail, the bearing fails quickly afterwards.

How did you inspect the bearing to establish the condition?

We do not re-use any bearings after having been installed and run, the removal and re-installation causes the balls to run in different tracks and at our speed and load this is a disaster waiting to happen...maybe your conditions will allow this.

Alex

 

[unclesyd]

Based on my personal experience the horse has been dead for some time.

Based on some other facts like the people who rebuild/rework bearings they get the seals from some place.

How is the seal failing?

Do you have room to put a face seal on the bearing?

 

[bluesman0007]

Thanks guys,

I was just given additional information. It is believed that the seal is being damaged on installation. The bearing is shrunk with liquid nitrogen to press fit into a housing. The tapping of the bearing into place could be the cause of damage. I may have of answered my own question. Removeal of the seal prior to installation and re-installing the seal when complete. This seal is basically a flat washer with a rubber sealing element on the i.d. By the way these are new bearings never been run. It would still be nice to find these.

Dennis

SolidWorks 2006 SP4.0
Windows XP Pro, Pentium4 3.00GHz
1.5 GB RAM, Matrox P650
Logitech Marble Mouse, CADMAN

 

[automatic2]

liquid nitrogen, wow, that must be an extremely difficult process. What class of fit are you aiming for?

If your bearing had been in service and the seal is damaged, your bearing is hooped, or on it's way. If the seal is being mechanically injured during service, that is a seperate issue that needs to be dealt with. If your injuring the seal on installation, alter your procedures. Press only on the race itself that is being fit. For heat or shrink fits, a punch is a back up only. The assembly should 'fall' together as any hangups lead to prompt siezures. Walking the bearing with a punch is bad news.

 

[MikeHalloran]

LN2 has to make the rubber so brittle that even a touch will fracture it.

I think you've solved the problem you set out to solve by temporarily removing the seal.

What the cryogenic installation process does to the bearing is a separate problem.




Mike Halloran
Pembroke Pines, FL, USA

 

[bluesman0007]

Thanks for all the responses. We've used the LN2 process for a long time. We do a lot of repair work with some new build mixed in and this process has severed both our customers and ourselves well. This is the first time I remember having this problem but it was easily solved by modifiying the procedure.

Dennis

SolidWorks 2006 SP4.0
Windows XP Pro, Pentium4 3.00GHz
1.5 GB RAM, Matrox P650
Logitech Marble Mouse, CADMAN