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. 10, 2007
Filed:
Jan. 30, 2004
Osamu Tatewaki, Gunma-ken, JP;
Hiroshi Eda, Gunma-ken, JP;
Toshihiro Fukuda, Gunma-ken, JP;
Osamu Saito, Gunma-ken, JP;
Jun Okada, Gunma-ken, JP;
Osamu Tatewaki, Gunma-ken, JP;
Hiroshi Eda, Gunma-ken, JP;
Toshihiro Fukuda, Gunma-ken, JP;
Osamu Saito, Gunma-ken, JP;
Jun Okada, Gunma-ken, JP;
NSK Ltd., Tokyo, JP;
Abstract
An electric power steering apparatus comprises a ball nut rotationally driven by an electric motor through a gear train and having a female thread groove formed in the inner periphery thereof, a rack shaft disposed through the ball nut on the axis thereof and having a male thread groove so formed in its outer periphery as to face to the female thread groove, a ball screw mechanism having a number of circulation balls interposed between the female thread groove and the male thread groove, and a housing for holding the ball nut rotatably through the bearing. An elastic member is interposed between the housing and the ball nut in order to permit the ball nut to make a predetermined displacement.