US 12,467,501 B2
Crown-shaped retainer for ball bearing, and ball bearing
Masahito Matsui, Kanagawa (JP); Takefumi Kichikawa, Kanagawa (JP); Haruhisa Ashida, Kanagawa (JP); and Taketoshi Chifu, Kanagawa (JP)
Assigned to NSK LTD., Tokyo (JP)
Appl. No. 18/272,683
Filed by NSK LTD., Tokyo (JP)
PCT Filed Jan. 17, 2022, PCT No. PCT/JP2022/001447
§ 371(c)(1), (2) Date Jul. 17, 2023,
PCT Pub. No. WO2022/154125, PCT Pub. Date Jul. 21, 2022.
Claims priority of application No. 2021-005914 (JP), filed on Jan. 18, 2021; application No. 2021-005915 (JP), filed on Jan. 18, 2021; and application No. 2021-041572 (JP), filed on Mar. 15, 2021.
Prior Publication US 2024/0141954 A1, May 2, 2024
Int. Cl. F16C 33/41 (2006.01); F16C 33/66 (2006.01)
CPC F16C 33/416 (2013.01) [F16C 33/418 (2013.01); F16C 33/6629 (2013.01)] 38 Claims
OG exemplary drawing
 
1. A crown type cage for a ball bearing, which is made of resin, comprising:
an annular main portion;
a plurality of pillar portions protruding in an axial direction from the main portion at predetermined intervals in a peripheral direction; and
a spherical pocket formed between the adjacent pillar portions and capable of holding a ball, wherein
each pillar portion has a pair of claw portions of which tip end portions are spaced apart from each other and a connection portion that connects the pair of claw portions, and
a first surface of the main portion is provided with a first projection portion protruding in the axial direction, wherein
an inlet having a width shorter than a diameter of the ball and for inserting the ball is provided between the tip end portions of the two adjacent claw portions forming the pocket,
a radius of curvature of a spherical recessed surface of at least one pocket is greater than a radius of curvature of a rolling surface of the ball,
an outer diameter of at least one claw portion is smaller than an outer diameter of the main portion,
a radial width of at least one claw portion is ½ or less of a radial width of the main portion, and
an axial width from a first surface of the connection portion of at least one pillar portion to the first surface of the main portion is ½ or less of an axial width of the crown type cage for the ball bearing.