Patent ID: 6068409
Filing Date: 2000-05-30
Classification: F16C

Abstract:
A synthetic resin cage for a roller bearing which is formed of a synthetic resin such that annular bodies separated from each other in the axial direction of the cage are integrally connected by columnar portions arranged in the circumferential direction of the cage at predetermined intervals in order to define pockets for accommodating rollers, whereina radially outer surface of said columnar portion forms a portion of a cylindrical surface which is in parallel with outer circumferential surfaces of said annular bodies, which serve as guide surfaces for the cage, and whose radius is appropriately smaller than that of the outer circumferential surfaces of said annular bodies, thus forming a surface of a passageway for lubrication oil extending over the entire axial length of said columnar portion; a radially inner surface of said columnar portion, together with inner circumferential surfaces of said annular bodies, forms a portion of a cylindrical surface; and circumferentially opposite side surfaces of said columnar portion are substantially in parallel with the radial centerlines of said corresponding pockets;grooved portions are formed in the circumferentially opposite side surfaces of said columnar portion at axially opposite end regions adjacent to said respective annular bodies;an outer roller-retaining portion having a pawl-like appearance is formed on each of circumferentially opposite edges of a radially outer surface of said columnar portion at a region located between said opposite grooved portions in such a manner as to project toward said pocket and radially outward to such a degree as not to project beyond said annular bodies; and a surface of said outer roller-retaining portion which faces said pocket is slanted with respect to the side surface of said columnar portion; andinner roller-retaining portions are formed on each of circumferentially opposite edges of a radially inner surface of said columnar portion at axially opposite end regions located between and adjacent to said respective opposite grooved portions in such a manner as to project toward said pocket, so that a central receded portion is formed between said inner roller-retaining portions.