spherical bronze bearings
spherical bronze bearings
(OP)
We make DC motors where we use spherical bronze bearings on both ends with an impregnated felt for extra lube and a brass retainer pressed against the bearing to hold every thing.
Trouble is...during shipment, they lock up and we have to ask the customer to use a hammer to tap them back into alignment.
I think the retainer is keeping the bearing for rotating in the seat and keeping itself aligned. But we also want the bearing from spinning.
Anyone know of any design specs on how to properly build a retaining system for a spherical bearing in a motor???
Trouble is...during shipment, they lock up and we have to ask the customer to use a hammer to tap them back into alignment.
I think the retainer is keeping the bearing for rotating in the seat and keeping itself aligned. But we also want the bearing from spinning.
Anyone know of any design specs on how to properly build a retaining system for a spherical bearing in a motor???





RE: spherical bronze bearings
Kind Regards
motorhead1
RE: spherical bronze bearings
RE: spherical bronze bearings
RE: spherical bronze bearings
But thanks for the help
RE: spherical bronze bearings
I have seen in some vertical motors with similar spherical bearings there is a spring under the stationary bottom ring which pushes that ring up to keep the bearing together in the event of momentary upthrust. Otherwise skidding would occur during upthrust resulting in possible bearing damage.
Not sure if this has anything to do with your situation.
RE: spherical bronze bearings
RE: spherical bronze bearings
It seems like the clamping system should provide a thrust preload on the bearing to prevent them from separating.
Also maybe the motors should be oriented within the truck so that the shafts are pointed from side to side of the truck. That way the worst impacts (up/down bumps and impacts from braking) will not cause axial separation of the bearing.
jbartos - If motor shop required it's customers to assemble motors on-site, I suspect they would not have much business.
RE: spherical bronze bearings
electricpete: I said that these are bronze spherical bearings held with a retainer in a pocket. They are considered self aligning( and dis aligning in this case too). There is no preload, since these are not ball bearings. So the armature is allowed to float with some endplay in the motor. Remember, this just happens in transport. Never locks up during operation.
RE: spherical bronze bearings
RE: spherical bronze bearings
Just my view from long distance. I'm sure you have a better appreciation of the problem than I do.
RE: spherical bronze bearings