公开(公告)号：US20240141954A1

公开(公告)日：2024-05-02

申请号：US18272683

申请日：2022-01-17

Applicant: NSK LTD.

Inventor： Masahito MATSUI ,  Takefumi KICHIKAWA ,  Haruhisa ASHIDA ,  Taketoshi CHIFU

IPC: F16C33/38

CPC classification number: F16C33/3806 ,  F16C33/3856 ,  F16C33/3887

Abstract: A crown type cage for a ball bearing includes 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 balls. The 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. A bottom surface of the main portion is provided with a part protruding in the axial direction.

公开(公告)号：US20240026927A1

公开(公告)日：2024-01-25

申请号：US18037699

申请日：2021-11-19

Applicant: NSK LTD.

Inventor： Azuma ITO ,  Tomoaki MATSUMOTO ,  Haruhisa ASHIDA

IPC: F16C33/66 ,  F16C19/18

CPC classification number: F16C33/6633 ,  F16C19/184

Abstract: The present invention provides a grease composition which makes it possible to prevent deterioration in sealing properties even when base oil having a kinetic viscosity of as low as, for example, 5-40 mm2/s is used and which makes it possible to realize both sealing properties and a decrease in torque. The present invention also provides a rolling device. A sealing member (12a) comprises a plurality of sealing lips (114), (115), (116) each of which is made of an elastic material. A grease composition is sealed in void parts (121), (122) that are each located between a sliding surface of a slinger (106), on which the plurality of sealing lips slide, and two adjacent sealing lips. This grease composition contains base oil and a polar polymer. The polar polymer has a weight-average molecular weight of 5,000-140,000.