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:
Apr. 07, 2015
Filed:
May. 12, 2011
Manabu Kino, Nagano, JP;
Manabu Kino, Nagano, JP;
Harmonic Drive Systems Inc., Tokyo, JP;
Abstract
Provided with a sealed rotational output unit () which includes a tubular shaft () having an outer circumferential surface sealed with a ferrofluidic seal (); a rotating output shaft () disposed inside the tubular shaft (); and an O-ring () that seals between the tubular shaft () and the rotating output shaft (). When the rotating output shaft () is directly coupled to a hollow motor shaft (), shaking thereof is absorbed by the O-ring (), causing no excessive stress to be produced on the bearing side of the hollow motor shaft () or on a bearing () side of the ferrofluidic seal (). Since the tubular shaft () rotates in conjunction with the rotating output shaft (), the O-ring () that seals therebetween does not degrade in sealing capability due to wear by sliding. The sealed rotational output unit can be used with high rotational accuracy by directly coupling to a hollow motor () without any joint.