Rolling bearing, rotating device, and method for manufacturing rolling bearing

Patent metadata

Field	Value
Publication number	US-2023184289-A1
Application number	US-202218074248-A
Country	US
Kind code	A1
Filing date	Dec 2, 2022
Priority date	Dec 15, 2021
Publication date	Jun 15, 2023
Grant date	—

Abstract

Provided is a rolling bearing that can both ensure durability and reduce rotational resistance. The rolling bearing includes a seal member that is mounted on an outer ring and that covers a space between an inner ring and the outer ring from an outer side in an axial direction, and grease disposed between a rolling element and the seal member. The seal member includes an annular pedestal portion in contact with the outer ring from an outer side in the axial direction, an extending portion that extends outward in the axial direction from an inner peripheral edge of the pedestal portion, and a flat surface portion that extends along a radial direction from an end edge of the extending portion on an outer side in the axial direction toward the inner ring. The grease includes an outer ring contact portion in contact with an inner peripheral surface of the outer ring, and a seal member contact portion in contact with the flat surface portion on an outer side in the axial direction and an inner ring side with respect to the outer ring contact portion. An area of the seal member contact portion is larger than a contact area between the grease and the extending portion as well as the pedestal portion of the seal member.

First claim

What is claimed is:

1 . A rolling bearing comprising:
an inner ring and an outer ring arranged coaxially with each other; a rolling element disposed between the inner ring and the outer ring; a seal member that is mounted on one raceway ring of the inner ring and the outer ring and that covers a space between the inner ring and the outer ring from an outer side in an axial direction; and grease disposed between the rolling element and the seal member, wherein the seal member includes:
an annular pedestal portion in contact with the one raceway ring from an outer side in the axial direction,
an extending portion that extends outward in the axial direction from a peripheral edge of the pedestal portion on the other raceway ring side of the inner ring and the outer ring, and
a flat surface portion that extends along a radial direction from an end edge of the extending portion on an outer side in the axial direction toward the other raceway ring,
the grease includes:
a raceway ring contact portion in contact with a peripheral surface of the one raceway ring, the peripheral surface facing the other raceway ring, and
a seal member contact portion in contact with the flat surface portion on an outer side in the axial direction and the other raceway ring side with respect to the raceway ring contact portion, and
an area of the seal member contact portion is larger than a contact area between the grease and the extending portion as well as the pedestal portion of the seal member.

2 . The rolling bearing according to claim 1 , wherein
the seal member contact portion includes a center position of the grease in the radial direction when viewed from the axial direction.

3 . The rolling bearing according to claim 1 , wherein
the grease is not in contact with the extending portion.

4 . The rolling bearing according to claim 1 , wherein
the raceway ring contact portion is provided at an interval in the axial direction from a contact portion between the one raceway ring and the pedestal portion.

5 . The rolling bearing according to claim 1 , wherein
the grease is not in contact with the pedestal portion.

6 . The rolling bearing according to claim 1 , wherein
the one raceway ring includes a protruding portion that protrudes toward the other raceway ring side and on which a raceway surface is formed, the protruding portion includes an end surface that faces an outer side in the axial direction, that is connected to the peripheral surface at a peripheral edge on the other raceway ring side, and that is in contact with the pedestal portion, and the pedestal portion does not protrude toward the other raceway ring side with respect to the end surface when viewed from the axial direction.

7 . A rotating device comprising:
a rotatably disposed rotating body; a support body configured to rotatably support the rotating body; and the rolling bearing according to claim 1 interposed between the rotating body and the support body.

8 . A method for manufacturing a rolling bearing, the rolling bearing including
an inner ring and an outer ring arranged coaxially with each other, a rolling element disposed between the inner ring and the outer ring, a seal member that is mounted on one raceway ring of the inner ring and the outer ring and that covers a space between the inner ring and the outer ring from an outer side in an axial direction, and grease disposed between the rolling element and the seal member, the seal member including:
an annular pedestal portion in contact with the one raceway ring from an outer side in the axial direction,
an extending portion that extends outward in the axial direction from a peripheral edge of the pedestal portion on the other raceway ring side of the inner ring and the outer ring, and
a flat surface portion that extends along a radial direction from an end edge of the extending portion on an outer side in the axial direction toward the other raceway ring,
the method comprising:
an application step of bringing the grease into contact with the one raceway ring, and applying the grease such that the grease protrudes outward in the axial direction and toward the other raceway ring side from a contact portion with the one raceway ring;
a contact step of bringing the seal member close to the one raceway ring from an outer side in the axial direction and bringing the flat surface portion into contact with an end edge of the grease on an outer side in the axial direction; and
a mounting step of, after the contact step, bringing the seal member close to the one raceway ring, bringing the pedestal portion into contact with the one raceway ring from an outer side in the axial direction, and pressing the grease inward in the axial direction by the flat surface portion.

Assignees

• Seiko Instr Inc

Inventors

• Iino Akihiro
• Kosaka Takayuki
• Hasegawa Haruhiko
• Kobayashi Daisuke

Classifications

• F16C33/78

  with a diaphragm, disc, or ring, with or without resilient members {(F16C33/761 takes precedence)} · CPC title

• F16C33/6603

  with grease as lubricant · CPC title

• F16C19/16 Primary

  with a single row of balls · CPC title

• F16C33/6607

  Retaining the grease in or near the bearing · CPC title

• F16C33/6614 Primary

  in recesses or cavities provided in retainers, races or rolling elements · CPC title