Patent ID: 6955476

Claim:
A retainer for rolling bearings comprising: a rolling element receiving pocket for receiving a rolling element, said pocket being formed by finish-machining a blank pocket with a milling tool member while a machining part of said tool member is inserted into said blank pocket in a radial direction of said retainer and then translated in an axial and revolving directions of said retainer, wherein said machining part of said tool member has a sectional contour which coincides with a sectional configuration of said pocket in a cross section taken along the radial direction of said retainer after the formation of said pocket is completed, wherein said rolling element is a roller, said pocket is defined by a pair of ring-shaped side plates and a pair of pillars each having end portions which are respectively connected to said ring-shaped side plates, a first pocket surface is formed on each of said pillars and a second pocket surface is formed on each of said ring-shaped side plates, wherein one of said pillars has a chamfer portion provided thereon at a boundary between said one of said pillars and either an outside or inside diameter surface of the retainer, said first pocket surface is formed in an arc-shaped configuration in a cross section along the radial direction of said retainer, wherein roller run-out preventing portions are formed at end portions of said pillars in the radial direction of said retainer, the width of said pocket in the revolving direction of the retainer is made smaller than the diameter of said roller, said width being defined between adjacent roller run-out preventing portions and formed at an end thereof in the radial direction of said retainer, wherein said first pocket surface faces toward the revolving direction of said retainer, and said second pocket surface faces toward the axial direction of said retainer and an escaping recess is disposed between said first and second pocket surfaces, wherein said tool member comprises a first tool for finish-machining said first pocket surface and a second tool for finish-machining said second pocket surface and said escape recess, and wherein a surface of the escaping recess is arc-shaped when viewed from the radial direction of the retainer.