公开(公告)号：US20230296132A1

公开(公告)日：2023-09-21

申请号：US18021098

申请日：2021-08-06

Applicant: NTN CORPORATION

Inventor： Katsuaki SASAKI ,  Susumu MIYAIRI

IPC: F16C19/06 ,  F16C33/41 ,  F16C33/66 ,  F16C33/76

CPC classification number: F16C19/06 ,  F16C33/418 ,  F16C33/664 ,  F16C33/76

Abstract: A ball bearing is provided which includes a cage circular annular portion and a seal member. The cage circular annular portion has a cage-side sliding contact surface axially opposed to the seal member and configured to come into sliding contact with the seal member. The seal member has a seal-side sliding contact surface configured to come into sliding contact with the cage-side sliding contact surface. A plurality of axial protrusions each having an axially convex circular arc shape in cross sections along a circumferential direction are formed on one of the cage-side sliding contact surface and the seal-side sliding contact surface at constant pitches in the circumferential direction.

公开(公告)号：US20250027539A1

公开(公告)日：2025-01-23

申请号：US18712961

申请日：2022-11-21

Applicant: NTN CORPORATION

Inventor： Katsuaki SASAKI ,  Susumu MIYAIRI ,  Masato AKAHORI

IPC: F16C33/78 ,  F16C33/46

Abstract: An outer surface rubber portion is formed to cover the entire axially outer surface of a metal core. An inner surface rubber portion is formed with a circular annular opening through which the axially inner surface of the metal core is exposed on the same circumference passing on the radially outer side of minute protrusions; and circular arc-shaped openings through which the axially inner surface of the metal core is exposed on the same circumference passing on the radially inner side of the minute protrusions.