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:
Mar. 06, 2012
Filed:
Jan. 06, 2010
Takumi Hayashi, Mie, JP;
Satoru Fukuzawa, Mie, JP;
Takumi Hayashi, Mie, JP;
Satoru Fukuzawa, Mie, JP;
NTN Corporation, Osaka, JP;
Abstract
A bearing bush, disposed in a shaft hole of an external gear of a seat reclining device, which slidingly contacts wedge-shaped pieces. The seat reclining device has a differential transmission mechanism for adjusting an open angle of a hinge connecting a seating surface of a seat and a backrest thereof to each other. The differential transmission mechanism has an internal gear; an external gear, having a smaller number of teeth than the internal gear, which engages the internal gear; a pair of the wedge-shaped pieces disposed in a circular arc-shaped gap formed between the shaft hole of the external gear and a shaft of the internal gear with tapered ends of the wedge-shaped pieces opposed to each other; and a compression coil spring for imparting an elastic force to the wedge-shaped pieces in a direction in which the wedge-shaped pieces depart from each other. When the wedge-shaped pieces are moved in sliding contact with the bearing bush inside the circular arc-shaped gap with the wedge-shaped pieces being pressed by a cam provided on the shaft of the internal gear, the external gear disengages from the internal gear, whereby the open angle of the hinge is adjustable. A sliding surface of the bearing bush is formed of a fluorocarbon resin composition containing fluorocarbon resin to which thermoplastic resin, carbon fibers, and molybdenum disulfide are essentially added.