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:
May. 20, 2008
Filed:
Jun. 21, 2005
Masato Mizuhara, Takaishi, JP;
Akio Osuka, Kashihara, JP;
Shigeo Ishihara, Anjo, JP;
Hisamitsu Hayashi, Handa, JP;
Masato Mizuhara, Takaishi, JP;
Akio Osuka, Kashihara, JP;
Shigeo Ishihara, Anjo, JP;
Hisamitsu Hayashi, Handa, JP;
Favess Co., Ltd., Aichi, JP;
Koyo Seiko Co., Ltd., Osaka, JP;
Toyoda Koki Kabushiki Kaisha, Aichi, JP;
Abstract
An electric power steering apparatus comprises a steering assisting electric motor having an output shaft and a speed reduction mechanism. The speed reduction mechanism includes conical first and second gears to be engaged with each other. The first and second gears include a plurality of teeth each having a tooth surface. The mutually corresponding tooth surfaces of the first and second gears each include engaging regions to be engaged with each other. A center position in a tooth width direction of the engaging region of each tooth surface of the first gear in an unloaded state is offset by a first offset amount from center position in the tooth width direction of the tooth surface of the first gear to a relatively small end portion of the tooth of the first gear. A center position in a tooth width direction of the engaging region of each tooth surface of the second gear in an unloaded state is offset by a second offset amount from a center position in the tooth width direction of the tooth surface of the second gear to a relatively small end portion of the tooth of the second gear.