Flat-Land Thrust Bearing Paradox  

Oleh:

Booser, E.R.

Jenis: Article from Bulletin/Magazine - ilmiah internasional
Dalam koleksi: Machine Design (Soft Copy ada dalam http://search.proquest.com/) vol. 82 no. 21 (Dec. 2010), page 52-59.
Topik: Flat-Land; Bearing; Load Limits; Oil Flow; Nomenclature; Boosting Capacity.

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: MM44.63 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Millions of flat-land thrust bearings are used in everything from large turbines to gear sets, but engineers still don't have good tools for predicting how the bearings will work in practice. Flat-land thrust bearing surfaces are typically segmented, and an oil film separates them from the surfaces they support. The parallelism of the two surfaces theoretically prevents any oil pressure from developing in the film. That is, an oil film between two parallel bearing surfaces should not be able to support a load. In practice, however, thermal expansion of the oil and bearing surfaces lets oil-film pressure develop to some extent. Flat-land thrust bearings will never hold more than 20 to 25% of the load supported by their tapered-land or stepped counterparts which have physical wedges to pressurize oil in the direc-tion of sliding. By understanding how flat-land thrust bearings work and what controls their performance characteristics such as load capacity, power loss, and temperature rise, engineers can get the most out of turbines, compressors, gear sets, and other rotating machines for light loads, simple axial positioning, and occasional reverse thrust.

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