Patent ID: 8303192

Claim:
A resin snap cage for a radial ball bearing which comprises: a circular main part made of a resin; a plurality of pockets provided at a first end face in an axial direction of the circular main part; and a reinforcing member concentrically provided along the circular main part at a second end face in the axial direction of the circular main part, characterized in that the following four conditions are fulfilled: Condition 1: The reinforcing member has a rectangular cross-sectional shape at a plane parallel to the axial direction; Condition 2: The reinforcing member is embedded to be integrally formed with a recessed portion formed at the second end face in the axial direction of the circular main part; Condition 3: The resin snap cage is manufactured by insert molding using the reinforcing member as an insert, and the circular main part and the reinforcing member are integrally formed at the time of the insert molding or the reinforcing member is integrally fixed to the circular main part that has been manufactured by injection molding with an adhesive or press fitting; and Condition 4: When F denotes a radial distance between an outside diameter surface of the circular main part and an outside diameter surface of the reinforcing member, G denotes a radial distance between an inside diameter surface of the circular main part and an inside diameter surface of the reinforcing member, and E denotes an axial direction distance between a bottom face of one of the pockets and a pocket-side surface of the reinforcing member, E, F, and G exceed zero and the outside diameter surface, the inside diameter surface, and the pocket-side surface of the reinforcing member are covered with the circular main part and a surface opposite to the pocket side is exposed.