Patent ID: 6776532
Filing Date: 2004-08-17
Classification: F16C

Abstract:
A needle roller bearing comprising:a plurality of cylindrical needle rollers disposed circumferentially and parallel to each other about a central axis of said roller bearing, each of said rollers having a first end portion and a second end portion located axially away from each other; a retainer that rotatably supports said rollers, said retainer comprising: a cylindrical first retainer member having a plurality of first notches circumferentially alternately between first protrusions, said first notches respectively individually rotatably supporting said first end portions of said rollers, said first retainer member further having a first boss with a first side face that extends perpendicularly to said central axis of said roller bearing; and a cylindrical second retainer member located axially away from and opposite said first retainer member, said second retainer member having a plurality of second notches circumferentially alternately between second protrusions, said second notches respectively individually rotatably supporting said second end portions of said rollers, said second retainer member further having a second boss with a second side face that extends perpendicularly to said central axis of said roller bearing, said first and second side faces of said first and second bosses facing axially inwardly toward one another; wherein a plurality of voids are provided to form grease-containing spaces axially between oppositely disposed pairs of said first and second protrusions of said first and second retainer members, and circumferentially between circumferentially adjacent pairs of said rollers; and an outer race having a cylindrical shape, opposite ends of said outer race being supported by said first and second retainer members, with end surfaces of said opposite ends of said outer race respectively supported against said first side face of said first boss of said first retainer member and said second side face of said second boss of said second retainer member.