Planetary Roller Screw for Linear Motion  

Oleh:

[s.n]

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 20.
Topik: Roller Screw; Planetary roller; Preload spacer; Gear-ring retaining ring.

Ketersediaan

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

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Isi artikel

When it's necessary to convert motion from rotary to linear, engineers usually use ball or leadscrews. But planetary roller screws, such as those from INA, a brand of the Schaeffler Group USA, Fort Mill, S. C. Error! Hyperlink reference not valid.), can do the same task with less vibration, greater stiffness, and higher rotational speeds and accelerations. The device consists of a screw and nut with several planetary rollers parallel to the axis between the screw and nut. The rollers have many points of contact with the screw and roller nut, providing two to three times the stiffness of similarly sized ball screws without significantly increasing friction or decreasing efficiency.The contact geometry also improves shock resistance and increases static and dynamic thrust-load capacities by a factor of 3 to 5 over comparable ball screws. Preload spacer Gear-ring retaining ring Planetary roller The rollers in the planetary roller screw are always in contact and do not circulate in and out of the nut.This lets the screw accelerate faster and reach speeds up to 6,500 rpm. Ball screws are typically limited to around 3,000 rpm. Standard lead accuracy is 10 um/300 mm, with 5 um/300 mm available as an option.

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