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:
Aug. 03, 1999
Filed:
Nov. 14, 1997
Norio Shirokoshi, Nagano-ken, JP;
Harushige Aoyagi, Nagano-ken, JP;
Harmonic Drive Systems, Inc., Tokyo, JP;
Abstract
A flexible meshing type gear drive 1 has a rigid internal gear 2 and a flexible external gear 3 whose tooth profiles are defined as follows. First, initial tooth profiles of these gears 2, 3 are defined as in the case that the tooth number of the rigid internal gear is 102 and that of the flexible external gear is 100. The initial tooth profile is adopted as it is for that of the rigid internal gear 2. While, the actual tooth profile of the flexible external gear 3 is determined by thinning out one tooth at every one tooth from the external teeth 34-1, 2, 3, . . . of the initial tooth profile to form tooth bottom portions connecting the respective remaining external teeth 34-1, 3, 5, . . . . Since the flexible external gear 3 has the thus obtained tooth profile in which the tooth bottom portions 35b between the teeth are wider than those 35a of the conventional tooth profile, stress concentration occurring in the tooth bottom portions 35b can be suppressed, whereby the flexible meshing type gear drive having a low reduction ratio can easily be obtained.