The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 31, 2011
Filed:
Mar. 02, 2006
Hidekazu Michioka, Tokyo, JP;
Makoto Iizumi, Tokyo, JP;
Satoshi Fujita, Kyoto, JP;
Akimasa Yoshida, Tokyo, JP;
Hidekazu Michioka, Tokyo, JP;
Makoto Iizumi, Tokyo, JP;
Satoshi Fujita, Kyoto, JP;
Akimasa Yoshida, Tokyo, JP;
THK Co., Ltd., Tokyo, JP;
Abstract
A roller screw of the present invention has a screw shafthaving a roller rolling surfacespirally formed with a lead on an outer surface thereof; a nuthaving a roller rolling surfacespirally formed on an inner surface thereof to face the roller rolling surfaceof the screw shaft; and a plurality of rollersarranged in a rolling pathbetween the roller rolling surfaceof the screw shaftand the roller rolling surfaceof the nutand moving around the screw shaft while rotating on rotation axes of the rollers. In this roller screw, each of the rotation axesof the rollerssubstantially crosses a center lineof the screw shaft. Since each of the rotation axesof the rollerscrosses the center lineof the screw shaft(in other words, the rollersarranged in the rolling pathare not skewed from the beginning) even when the rolling pathhas the lead, the rollerare allowed to move smoothly.