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:
Sep. 25, 2012
Filed:
Sep. 07, 2005
Akihiro Teramachi, Tokyo, JP;
Hidekazu Michioka, Tokyo, JP;
Hiroshi Niwa, Tokyo, JP;
Akimasa Yoshida, Tokyo, JP;
Akihiro Teramachi, Tokyo, JP;
Hidekazu Michioka, Tokyo, JP;
Hiroshi Niwa, Tokyo, JP;
Akimasa Yoshida, Tokyo, JP;
THK Co., Ltd., Tokyo, JP;
Abstract
A roller screw is provided having a structure suitable for circulating rollers. The roller screw has a screw shaftwith a spiral roller rolling grooveformed on an outer peripheral surface thereof; a nutwith a spiral roller rolling grooveopposed to the roller rolling groove of the screw shaft and formed on an inner peripheral surface thereof; and a plurality of rollersarranged in a load roller rolling pathbetween the roller rolling grooveof the screw shaftand the roller rolling grooveof the nut. Inside the nutis provided a roller return pathextending linearly in parallel with an axis line of the nut. To opposite end faces in an axis line direction of the nutare attached direction change path forming membersin which direction change pathsto connect the load roller rolling pathand the roller return pathare formed. The roller return pathis twisted to rotate an attitude of each of the rollerswhile the rollersmove in the roller return path