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:
Nov. 16, 2010
Filed:
Sep. 02, 2004
Akihiro Teramachi, Shinagawa-ku, JP;
Hidekazu Michioka, Shinagawa-ku, JP;
Hiroshi Niwa, Shinagawa-ku, JP;
Kentaro Nishimura, Shinagawa-ku, JP;
Akihiro Teramachi, Shinagawa-ku, JP;
Hidekazu Michioka, Shinagawa-ku, JP;
Hiroshi Niwa, Shinagawa-ku, JP;
Kentaro Nishimura, Shinagawa-ku, JP;
THK Co., Ltd., Tokyo, JP;
Abstract
There is provided a roller screw comprising a screw shafthaving an outer peripheral surface in which a spiral roller rolling grooveis formed, a nut memberhaving an inner peripheral surface in which a spiral loaded roller rolling grooveis formed so as to oppose to the roller rolling groove of the screw shaft, a return pipein which a roller return passageis formed so as to connect one and another ends of a loaded roller rolling passagebetween the roller rolling grooveof the screw shaftand the loaded roller rolling grooveof the nut member, a number of rollersdisposed in the loaded roller rolling passageand the roller return passage, wherein the roller return passageis twisted so that an attitude of the rollerchanges as the roller moves in an axial direction of the return pipe. Such roller screw enables to provide an easy assembling and compact structure and to realize smooth circulation of the roller.