Planetary

One translation of the Japanese term ミニアチュアプラネタリ用ケージ＆ローラ in English is "cages and rollers for miniature planetary gears," as opposed to "cage & rollers for miniature planetary."

I would strongly suggest adding at least the word "gear"!

References

• http://source.theengineer.co.uk/motion-control/bearings/nsk-to-show-fuel-efficient-automotive-technologies/357649.article
• http://www.jp.nsk.com/company/presslounge/news/2009/press090929.html
• http://www.nsk.com/company/presslounge/news/2009/press09101901.html

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