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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.:

US 9874273 B1

PDFFull Text
Date of Patent:
Jan. 23, 2018

Filed:

Feb. 02, 2015

Method of manufacturing a flexible externally toothed gear for strain wave gearing

Applicant:

Harmonic Drive Systems Inc., Shinagawa-ku, JP;

Inventors:

Masaru Kobayashi, Azumino, JP;

Daisuke Orii, Azumino, JP;

Assignee:

HARMONIC DRIVE SYSTEMS INC., Shinagawa-Ku, Tokyo, JP;

Attorney:

Buchanan Ingersoll & Rooney PC

Primary Examiner:

Deborah Yee

Int. Cl.
CPC ...
C21D 9/32 (2006.01); C21D 1/22 (2006.01); F16H 55/06 (2006.01); F16H 55/08 (2006.01); C21D 6/00 (2006.01); C21D 8/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/22 (2006.01); C22C 38/34 (2006.01); C22C 38/38 (2006.01); C21D 7/06 (2006.01); F16H 49/00 (2006.01);
U.S. Cl.
CPC ...
F16H 55/0833 (2013.01); C21D 1/22 (2013.01); C21D 6/002 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 7/06 (2013.01); C21D 8/005 (2013.01); C21D 9/32 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/22 (2013.01); C22C 38/34 (2013.01); C22C 38/38 (2013.01); C21D 2211/008 (2013.01); F16H 55/06 (2013.01); F16H 2049/003 (2013.01);
Abstract

A method for manufacturing a flexible externally toothed gear includes: a first step (ST) for producing a primary molded article by performing near-net-shape plastic working on a material comprising a nickel-free low-alloy steel having a silicon content of 1.45-1.5 wt %; a second step (ST) for martempering the primary molded article; a third step (ST) for producing a secondary molded article from the primary molded article; and a fourth step (ST) for shot-peening the secondary molded article to change the surface portions of the tooth part and other parts to martensite. A flexible externally toothed gear can be obtained in which the surface hardness is kept within a prescribed range and the fatigue strength and abrasion resistance are high.

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