BEARING ENGINEERING QUESTION

[EDMO 1078]

Bearings for nosewheel pivot shaft:  Which would have the greater friction - 2 inches of brass bushing, or 4 inches of PVC?  Weight and Wear and Cost are not a consideration, since the nosewheel pivot gets less use than the PVC bearings for flaperon hangers.

Thanks,

EDMO

Edited 14 Aug 2014 by Ed In Missouri

[Av8r3400 1179]

A brass bushing will gall against steel and have a very high coefficient of friction.  You are probably thinking of a bronze bushing (tin-copper as opposed to zinc-copper alloy).

 

The Bronze will be more impact tolerant than the PVC (softer material) and will last longer at a resistance tightness.

 

 

 

 

(yes I am an engineer and yes I used to work for a bearing company.     )

[EDMO 1078]

I understand exactly what you are saying - I meant bronze - actually would prefer OilLite - Sure hope for no IMPACTS!

Thanks for the info.

EdMO

[Av8r3400 1179]

Just normal landing and taxiing operations will be impact enough to deform a PVC bushing, IMO.

 

OilLite would be your best option for durability and smooth operation.

[EDMO 1078]

I ordered two OilLite SAE-841 Oil Impregnated bronze bearings today.

Thanks again,

EDMO