Aerospace bearing
Encyclopedia
Aerospace bearings is a term used to describe bearings installed in aircraft
and aerospace
systems including commercial, private, military or space applications.
Materials include M50 tool steel (AMS6491), carbon chrome steel (AMS6444), the corrosion resistant AMS5930, 440C stainless steel, silicon nitride (ceramic) and titanium carbide-coated 440C.
Typically special attention is given to the material specification, non destructive testing and to the traceability of the bearing. The latter term describes a system of documents that enables an engineer to trace a bearing, typically back to its manufacturing batch and material supply.
In order to assure bearing performance it is necessary for the bearing steel to be of high quality. Jet engine bearings are typically manufactured from metals manufactured using a vacuum arc remelt to enable material requirements to be met.
Jet engine shaft bearings and accessory drive shaft bearings normally use single piece or two piece machined retainers. The pressed steel or moulded retainers found on mass produced bearings are not used.
Temperature and moisture resistant oils, greases and lubricants are normally specified. If the lubricant is not correct the performance of the bearing will be compromised.
Aircraft
An aircraft is a vehicle that is able to fly by gaining support from the air, or, in general, the atmosphere of a planet. An aircraft counters the force of gravity by using either static lift or by using the dynamic lift of an airfoil, or in a few cases the downward thrust from jet engines.Although...
and aerospace
Aerospace
Aerospace comprises the atmosphere of Earth and surrounding space. Typically the term is used to refer to the industry that researches, designs, manufactures, operates, and maintains vehicles moving through air and space...
systems including commercial, private, military or space applications.
Materials include M50 tool steel (AMS6491), carbon chrome steel (AMS6444), the corrosion resistant AMS5930, 440C stainless steel, silicon nitride (ceramic) and titanium carbide-coated 440C.
Typically special attention is given to the material specification, non destructive testing and to the traceability of the bearing. The latter term describes a system of documents that enables an engineer to trace a bearing, typically back to its manufacturing batch and material supply.
Design
When designing aerospace bearings, it is important to take a few things into account, including:- material standard
- design
- lubricationLubricationLubrication is the process, or technique employed to reduce wear of one or both surfaces in close proximity, and moving relative to each another, by interposing a substance called lubricant between the surfaces to carry or to help carry the load between the opposing surfaces. The interposed...
type - surface coatings and treatments
- non-destructive testing
- traceability
In order to assure bearing performance it is necessary for the bearing steel to be of high quality. Jet engine bearings are typically manufactured from metals manufactured using a vacuum arc remelt to enable material requirements to be met.
Jet engine shaft bearings and accessory drive shaft bearings normally use single piece or two piece machined retainers. The pressed steel or moulded retainers found on mass produced bearings are not used.
Temperature and moisture resistant oils, greases and lubricants are normally specified. If the lubricant is not correct the performance of the bearing will be compromised.