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. 20, 2011
Filed:
Apr. 22, 2005
Kiyoto Kobayashi, Nagano, JP;
Akihiro Yokoyama, Nagano, JP;
Kiyoto Kobayashi, Nagano, JP;
Akihiro Yokoyama, Nagano, JP;
Harmonic Drive Systems, Inc., Tokyo, JP;
Abstract
A ball screw/nut type linear actuator () where a ball nut () moves in forward-backward directions by rotation of a ball screw shaft () connected to a motor (), wherein the ball screw shaft () is connected and fixed, in a small diameter hollow section () of the motor shaft (), to the motor shaft so that a part of the locus of the movement of the ball nut () also enters into a large diameter hollow section () of the motor shaft (). The construction eliminates the need of a coupling for connecting the motor shaft () and the ball screw shaft () and enables the ball screw shaft () to be supported together with the motor shaft () by bearings () of the motor. As a result, a support bearing for supporting the ball screw shaft can be eliminated. Thus, a short and light linear actuator is realized.