Giving Bearings a Lift  

Oleh:

Booser, E. R. ; Khonsari, M.M.

Jenis: Article from Bulletin/Magazine - ilmiah internasional
Dalam koleksi: Machine Design (Soft Copy ada dalam http://search.proquest.com/) vol. 83 no. 10 (Jun. 2011), page 48-51.
Topik: Bearings Lift; Hydroelectric Generators

Ketersediaan

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

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Isi artikel

Massive rotors in hydroelectric generators, large ball mills, rolling mills, large electric motors, and steam and gas-turbine generators normally operate with great efficiency on oil films in sleeve and thrust bearings. To use additional hydraulic lift, designers must carefully calculate oil-feed rates, oil pressures, and bearing lift height. In sleeve journal bearings, pressurized hydraulic oil is supplied through one or more pockets or grooves. Applications with high loads or large bearing areas, such as large steam-turbine bearings, require special pocket geometries. Tailoring the lift pocket shape and size to an application can improve lift performance. For both journal and thrust bearings, the initial lift-off pressure is several times higher than the equilibrium pressure required for slow-speed turning. A relatively small oil accumulator can supply high-pressure lift-off oil while keeping the overall pressurized-oil-supply system smaller, more efficient, and capable of providing sufficient pressure for running conditions after lift off.

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