Ball bearing
AssigneeNtn Corporation
InventorsKatsuaki Sasaki, Susumu Miyairi
Life of this patent
Estimating the term…
Abstract
A ball bearing 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.
Claims20
A ball bearing comprising:
- an inner ring;
- an outer ring arranged radially outwardly of, and coaxially with, the inner ring;
- a plurality of balls disposed in an annular space between the inner ring and the outer ring;
- and
- a cage made of resin and retaining the balls,
- wherein the cage comprises:
- a cage circular annular portion extending circumferentially adjacent to a space through which the balls pass;
- and
- cage claw portions having a cantilevered structure axially extending from the cage circular annular portion, each between a corresponding pair of the balls circumferentially adjacent to each other,
- wherein each of the cage claw portions has:
- an outer-diameter-side axial groove formed in a radially outer surface of the cage claw portion, and axially extending from a distal end of the cage claw portion toward the cage circular annular portion;
- and
- an inner-diameter-side axial groove formed in a radially inner surface of the cage claw portion, and axially extending from the distal end of the cage claw portion toward the cage circular annular portion,
- wherein due to the outer-diameter-side axial groove and the inner-diameter-side axial groove of each of the cage claw portions, a cross section of the cage claw portions perpendicular to an axial direction has an H shape of which the openings of the letter H face radially outward and radially inward, respectively.
Dependencies are inferred from the claim text.