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.