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. 07, 2026
Filed:
Feb. 10, 2021
Ntn Corporation, Osaka, JP;
Ken Yasuda, Mie, JP;
NTN CORPORATION, Osaka, JP;
Abstract
To provide a rotor for electric water pumps in which a sliding bearing formed of a thermoplastic resin composition can be produced at a low cost and has superior low friction and low wear property, and an inner diameter of the sliding bearing is hardly contracted by the insert-molding. A rotorused for electric water pumps has a main bodythat supports an impeller of the pump, a sliding bearingthat rotatably supports a shaft, and a magnetdisposed to face a stator. The sliding bearingis an annealing treated body of a polyphenylene sulfide resin composition. The polyphenylene sulfide resin composition contains 5-30 vol % of carbon fiber, 1-20 vol % of polytetrafluoroethylene resin and 1-30 vol % of graphite relative to the whole volume of the polyphenylene sulfide resin composition. The main bodyis an injection-molded body disposed by insert-molding a thermoplastic resin composition, which is different from the polyphenylene sulfide resin composition, at an outer diameter side of the sliding bearing