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:
Jul. 18, 2017
Filed:
Oct. 24, 2012
Nsk Ltd., Tokyo, JP;
Haruhiko Kiyota, Gunma, JP;
Takeshi Yamamoto, Gunma, JP;
Fumiaki Mitsuhashi, Gunma, JP;
Kentaro Ogi, Gunma, JP;
NSK LTD., Tokyo, JP;
Abstract
Worm wheel construction that is able to sufficiently increase the strength of the connecting portion between a huband a gear portion, and to maintain sufficient durability even when applied to an electric power steering apparatus that applies a large auxiliary torque, is achieved. A synthetic resin gear portionis molded and formed in the end portion on the outer-diameter side of a metal hub. A first annular concave portionis provided on one surface side in the axial direction of the hub, and a second annular concave portionis provided on the other surface side in the axial direction thereof. Part of the synthetic resin of the gear portionis fed into the portions near the outer diameter of the first annular concave portionand the second annular concave portionto form a first restraining portionand a second restraining portion. These restraining portionstightly hold the end portion on the outer-diameter side of the hub, and improve the strength and rigidity of the connecting portion between the huband the gear portion