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US 12,404,898 B2Granted
Sealed bearing
AssigneeNtn Corporation
InventorsKatsuaki Sasaki, Susumu Miyairi, Masato Akahori
Life of this patent
Estimating the term…
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.
Claims28
A sealed bearing comprising:
- an inner ring;
- an outer ring having a seal fixing groove in an inner periphery of the outer ring, the outer ring being arranged radially outwardly of, and coaxially with, the inner ring;
- a plurality of rolling elements disposed in an annular space defined between the inner ring and the outer ring;
- an annular cage retaining the rolling elements;
- and
- an annular seal member disposed at a first axial end opening of the annular space,
- wherein the seal member comprises:
- a metal core having a circular annular plate shape, and axially opposed to the cage;
- and
- a rubber member vulcanization-bonded to the metal core,
- wherein the rubber member includes:
- an outer surface rubber portion bonded to an axially outer surface of the metal core;
- an inner surface rubber portion bonded to an axially inner surface of the metal core;
- an outer peripheral rubber portion extending radially outward from a radially outer end of the metal core, and the outer peripheral rubber portion being fitted in the seal fixing groove;
- and
- a seal lip extending radially inward from a radially inner end of the metal core, and
- wherein the inner surface rubber portion has a plurality of minute protrusions circumferentially spaced apart from each other, and kept in sliding contact with an axial side surface of the cage,
- wherein the outer surface rubber portion covers an entire area of the axially outer surface of the metal core,
- wherein the inner surface rubber portion has:
- one or more first openings through which the axially inner surface of the metal core is exposed on a same circumference passing on a radially outer side of the minute protrusions;
- and
- one or more second openings through which the axially inner surface of the metal core is exposed on a same circumference passing on a radially inner side of the minute protrusions.
19 more elements
A sealed bearing comprising:
- an inner ring;
- an outer ring arranged radially outwardly of, and coaxially with, the inner ring;
- a plurality of rolling elements disposed in an annular space defined between the inner ring and the outer ring;
- an annular seal member disposed in one axial end opening of the annular space;
- and
- a cage retaining the rolling elements,
- wherein the cage includes:
- a cage circular annular portion circumferentially extending in a region axially sandwiched between a passage region through which the rolling elements pass and the seal member;
- and
- cage claws having a cantilevered structure, and each of the cage claws axially extending from the cage circular annular portion so as to be located between a corresponding circumferentially adjacent pair of the rolling elements,
- wherein the seal member has a seal-side sliding surface axially opposed to the cage,
- wherein the cage has a cage-side sliding surface axially opposed to the seal-side sliding surface,
- wherein a plurality of minute protrusions are on one of the seal-side sliding surface and the cage-side sliding surface so as to be circumferentially spaced apart from each other,
- wherein each of the minute protrusions has a sliding contact distal end surface linearly extending radially in a sectional view orthogonal to a circumferential direction,
- wherein a smooth sliding contact flat surface configured to come into sliding contact with the sliding contact distal end surfaces of the minute protrusions while the bearing is rotating is on the other of the seal-side sliding surface and the cage-side sliding surface around an entire circumference thereof, and
- wherein each of the sliding contact distal end surfaces and the sliding contact flat surface are disposed such that while the bearing is stationary, the sliding contact distal end surface and the sliding contact flat surface are opposed to each other in a non-parallel manner at an angle in a direction in which a space between the sliding contact distal end surface and the sliding contact flat surface widens from a radially inner side toward a radially outer side.
13 more elements
A sealed bearing comprising:
- an inner ring;
- an outer ring arranged radially outwardly of, and coaxially with, the inner ring;
- a plurality of rolling elements disposed in an annular space between the inner ring and the outer ring;
- a cage retaining the rolling elements;
- and
- an annular seal member disposed in a first axial end side of the annular space,
- wherein the seal member has a seal-side sliding surface axially opposed to the cage,
- wherein the cage has a cage-side sliding surface axially opposed to the seal-side sliding surface,
- wherein one of the seal-side sliding surface and the cage-side sliding surface has:
- a plurality of minute protrusions configured to come into sliding contact with the other of the seal-side sliding surface and the cage-side sliding surface;
- and
- flat surfaces each connecting together a corresponding circumferentially adjacent pair of the minute protrusions, and disposed to circumferentially alternate with the minute protrusions,
- wherein each of the minute protrusions is configured such that a cross section of the minute protrusion along a circumferential direction has a circular arc shape having a radius of 1 mm to 30 mm, or has a trapezoidal shape having oblique sides each defining an angle of 45° or less with respect to the circumferential direction,
- wherein a height of each of the minute protrusions from the flat surfaces is set in a range of 0.01 mm to 0.50 mm,
- wherein a circumferential width of each of the minute protrusions is set in a range of 0.3 mm to 4.0 mm, and
- wherein a circumferential width of each of the flat surfaces is set in a range of 0.3 mm to 4.0 mm.
13 more elements
Dependencies are inferred from the claim text.