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:
Jun. 30, 2009
Filed:
Sep. 25, 2006
Osamu Nohara, Tarui-cho, JP;
Osamu Nohara, Tarui-cho, JP;
Nabtesco Corporation, , JP;
Abstract
A speed reducer has a crankshaft to be rotated in conjunction with a drive unit. First through third eccentric portions are provided on the crankshaft. First through third externally-toothed gears are adapted to be moved respectively in conjunction with the first through third eccentric portions. Pin teeth are disposed along an inner periphery of a case to allow each of the first, second and third externally-toothed gears to be in meshing engagement therewith. An output shaft unit is adapted to be rotated in conjunction with the first, second and third externally-toothed gears. The first, second and third eccentric portions are arranged with a given phase difference in a rotation direction of the crankshaft with respect to each other. Each of the first, second and third externally-toothed gears is in meshing engagement with less than half of the plurality of pin teeth.