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:
Dec. 25, 2012
Filed:
Apr. 26, 2007
Applicants:
Soshi Miyahara, Tokyo, JP;
Masahiko Yoshino, Tokyo, JP;
Takashi Sakuyama, Tokyo, JP;
Inventors:
Assignee:
THK Co., Ltd., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16H 25/22 (2006.01);
U.S. Cl.
CPC ...
Abstract
Provided is a roller screw having an unloaded roller return path of new shape capable of moving rollers smoothly. The roller circulation path of the roller screw has the unloaded roller return path and a loaded roller rolling path. The unloaded roller return pathis twisted so that while each rollermoves in the unloaded roller return pathits central axis is inclined. In a cross sectional shape of the twisted part of the unloaded roller return path, each of paired side surface corresponding partsandfacing respective side surfaces of the rolleris convex toward the inside of the unloaded roller return path