Ceramic Bearings Play Hardball  

Oleh:

Kay, Richard (Sr.)

Jenis: Article from Bulletin/Magazine - ilmiah internasional
Dalam koleksi: Machine Design (Soft Copy ada dalam http://search.proquest.com/) vol. 81 no. 19 (Oct. 2009), page 54.
Topik: Ceramic Bearings; Lubricants; Energy

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: MM44.60 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

Want to save a million barrels of petroleum a year, simply by changing the bearings in your machines? It sounds too good to be true, but new materials now make more-efficient ball bearings possible. A microscopic look at the surface finish of a metal bearing ball and race, shows peaks and valleys on both surfaces. Lubricants fill in these valleys with incompressible fluids like oil and grease. This prevents metal-to-metal contact between ball and race. But if the peaks do touch, the contact area is so small that even a small force on the ball or race results in pressures exceeding 1,000,000 psi. This causes cold welding between the ball and the race.

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