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:
Feb. 25, 2003
Filed:
Oct. 05, 2001
Yoshinori Ito, Nagano-ken, JP;
Hiroshi Kameda, Nagano-ken, JP;
Toshiyuki Abe, Nagano-ken, JP;
Toshiaki Kamata, Nagano-ken, JP;
Harmonic Drive Systems, Inc., Tokyo, JP;
Abstract
An absolute sensor has a high speed side encoder mounted on a high speed rotational shaft , a low speed rotational shaft arranged coaxially with the high speed rotational shaft , a planetary gear mechanism for reducing the speed of rotation of the high speed rotational shaft and delivering the rotation of reduced speed to the low speed rotational shaft . The planetary gear mechanism has a fixed sun internal gear a, a front stage planetary gear b, a rear stage planetary gear c, and an output sun internal gear d connected to the rear stage planetary gear c and low speed rotational shaft , wherein the planetary gears b and c are rotatably supported by an eccentric shaft portion of the shaft . The planetary gear mechanism can be constituted so that the input and output shafts are arranged coaxially, and can be made small with having a large reduction ratio in comparison with the conventional reduction mechanism comprised by spur gears.