Patent ID: 7931410
Filing Date: 2011-04-26
Classification: B21D,F16C

Abstract:
1. An integral machined cage for a cylindrical roller bearing, comprising: a pair of side plates; a plurality of columns, arranged circumferentially, integral with and connecting the pair of side plates; pockets formed between adjacent pairs of said columns, respectively; and relief portions provided at four corners, respectively, of each of the pockets, wherein on a section view perpendicular to an axis of the cage, the columns have side surfaces each having a circular arc shape, and the relief portions each have a circular arc shape in parallel to the circular arc shaped side surfaces of the respective pair of columns, wherein each of the relief portions comprises: a first straight portion connected to one of the side surfaces of one of the columns via an inclined surface forming an obtuse angle with respect to the one of the side surfaces; a second straight portion connected to an inner wall surface of one of the side plates via an inclined surface forming an obtuse angle with respect to the inner wall surface; and a circular arc portion connected to the first straight portion and the second straight portion.