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. 12, 2013
Filed:
Jun. 03, 2008
Katsufumi Abe, Iwata, JP;
Akihiko Katayama, Iwata, JP;
Katsufumi Abe, Iwata, JP;
Akihiko Katayama, Iwata, JP;
NTN Corporation, Osaka, JP;
Abstract
Needle roller bearing includes an outer ring having first outer ring member having center angle larger than 180° and second outer ring member having center angle smaller than 180°, needle rollers, a retainer having ring section pairs and column sections arranged between the pair of ring sections, d<X<D and the formula below are satisfied wherein D represents the outer ring inner diameter, r represents a needle roller radius, d represents the retainer outer diameter, and X represents a line segment length lconnecting circumferential ends of an inner diameter surface of the first outer ring member. When line lpassing through the center of the outer ring and parallel to segment lpasses through the column section, θ represents an angle between lines land lconnecting the center of the needle roller adjacent to the column section to the center of the outer ring,