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:
Mar. 15, 2005
Filed:
Dec. 04, 2002
Naomi Shirasawa, Nagano-ken, JP;
Naomi Shirasawa, Nagano-ken, JP;
Harmonic Drive Systems, Inc., Tokyo, JP;
Abstract
A planetary gear device includes a first, a second, and a third ring-shaped member that are concentrically arranged in that order from the inside. A sun gear is coaxially fixed to an end surface of the first ring-shaped member, planet shafts of planet gears are supported on an end surface of the ring-shaped member, and an internal gear is coaxially fixed to an end surface of the third ring-shaped member. A first cross roller bearing is formed between the first and second ring-shaped members and a second cross roller bearing is formed between the second and third ring-shaped members. Each member is arranged concentrically on a plane that is perpendicular to the device axis, so that a planetary gear device that is extremely slim in the device axial direction can be realized. Since the respective gear parts can be accessed from both sides in the device axial direction, the input and output can be laid out with great freedom.