Roller bearing
AssigneeNsk Ltd.
InventorTomohiro Motoda
Life of this patent
Estimating the term…
Abstract
A roller bearing includes an outer ring, an inner ring, and plural rolling elements rollably interposed between mutual raceway surfaces of the outer and inner rings, and is used by fitting an outer diameter surface of the outer ring serving as a fitting surface to a housing serving as a mating member or by fitting an inner diameter surface of the inner ring serving as a fitting surface to a shaft serving as the mating member. The fitting surface is provided with at least one protrusion so that a static torque Thold=Σ(F×r) generated by the protrusion is equal to or greater than a torque Tcreep generated by creep.
Claims4
A roller bearing comprising:
- an outer ring having a first side that defines a mounting surface and a second side that is opposite to the first side and that defines an outer ring raceway surface;
- an inner ring having a first side the defines a mounting surface and a second side that is opposite to the first side and that defines an inner ring raceway surface;
- and
- a plurality of rolling elements rollably interposed between the outer ring raceway surface and the inner ring raceway surface, wherein
- the mounting surface of the outer ring is configured to non rollably couple the roller bearing to a housing,
- the mounting surface of the inner ring is configured to non rollably couple the inner ring to a shaft,
- the mounting surface of the outer ring has a first region in which protrusions are defined and a second region that is:
- i) adjacent to the first region, and ii) devoid of any protrusions, and
- the first region extends from a first axial end of the mounting surface of the outer ring to a second axial end of the mounting surface of the outer ring, and
- the first region is only one region, and a second region, which is a remainder of the mounting surface of the outer ring, is larger than the first region and is devoid of any protrusions.
Dependencies are inferred from the claim text.