Bearing and bearing arrangement

Patent metadata

Field	Value
Publication number	US-2016298685-A1
Application number	US-201615089946-A
Country	US
Kind code	A1
Filing date	Apr 4, 2016
Priority date	Apr 9, 2015
Publication date	Oct 13, 2016
Grant date	—

Abstract

A spherical roller bearing having an outer ring providing at least one inner raceway, an inner ring providing a first and a second outer raceway, a plurality of roller elements arranged in a first and second roller row in-between the at least one inner raceway and the respective first and second outer raceway is provided. The bearing provides a cage for guiding the roller elements in the first and second roller row, the cage includes a plurality of cage pockets, wherein in each cage pocket one of the roller elements is disposed. The bearing further presents a specific pitch circle diameter (PCD), and the cage is essentially in-pitch roller centered in relation to the pitch circle diameter (PCD) when there is an axial force acting on the bearing. In addition, the present invention regards a bearing arrangement and a wind turbine bearing arrangement.

First claim

1 . A spherical roller bearing, comprising,
an outer ring including at least one inner raceway, an inner ring including a first and a second outer raceway, a plurality of roller elements arranged in a first and second roller row disposed between the at least one inner raceway and the first and second outer raceway, a cage for at least one of guiding and retaining the roller elements in the first and second roller row, the cage having a plurality of cage pockets, wherein one the roller elements is positioned in each of the plurality of cage pockets, the bearing further presents a specific pitch circle diameter (PCD), and wherein the cage is in-pitch roller centered in relation to the pitch circle diameter (PCD) when there is an axial force acting on the bearing.

2 . The spherical roller bearing according to claim 1 , wherein the in-pitch roller centering is arranged such that one of the first or second roller rows is in contact with the cage.

3 . The spherical roller bearing according to claim 1 , wherein the cage pockets in relation to the roller elements contained therein present a specific gap in the tangential direction of the cage, and wherein the tangential gap is set such that the cage pockets of one of the roller rows will contact the roller elements of the one roller row when an axial force is applied to the bearing.

4 . The spherical roller bearing according to claim 1 , wherein no spacer ring is disposed axially in-between the first and second roller rows.

5 . The spherical roller bearing according to claim 1 , wherein at least one of the plurality of cage pockets is radially outwardly enclosing the roller element contained therein such that the roller element will be restricted to move radially outwardly out from the at least one cage pocket.

6 . A spherical roller bearing according to claim 1 , wherein the inner ring further comprises a first and second axially outer region on opposite axial sides of the bearing, and wherein the respective first and second axially outer region provides a first and second respective side flange.

7 . The spherical roller bearing according to claim 1 , wherein the cage is a comb-shaped cage.

8 . A bearing arrangement providing a bearing, the bearing comprising:
an outer ring including at least one inner raceway, an inner ring including a first and a second outer raceway, a plurality of roller elements arranged in a first and second roller row disposed between the at least one inner raceway and the first and second outer raceway, a cage for at least one of guiding and retaining the roller elements in the first and second roller row, the cage having a plurality of cage pockets, wherein one the roller elements is positioned in each of the plurality of cage pockets, the bearing further presents a specific pitch circle diameter (PCD), and wherein the cage is in-pitch roller centered in relation to the pitch circle diameter (PCD) when there is an axial force acting on the bearing.

9 . A wind turbine bearing arrangement, the wind turbine bearing arrangement comprising:
a main shaft, and at least one bearing for supporting the main shaft, wherein the at least one bearing will accommodate a force in its axial direction, and wherein the bearing provides an outer ring including at least one inner raceway, an inner ring including a first and a second outer raceway, a plurality of roller elements arranged in a first and second roller row disposed between the at least one inner raceway and the first and second outer raceway, a cage for at least one of guiding and retaining the roller elements in the first and second roller row, the cage having a plurality of cage pockets, wherein one the roller elements is positioned in each of the plurality of cage pockets, the bearing further presents a specific pitch circle diameter (PCD), and wherein the cage is in-pitch roller centered in relation to the pitch circle diameter (PCD) when there is an axial force acting on the bearing.

10 . The spherical roller bearing according to claim 1 , wherein no mid-flange is disposed axially in-between the first and second roller rows.

Assignees

• Loof Marcus
• James Peter
• Stigsjöö Lars
• Skf Ab

Inventors

• Loof Marcus
• James Peter
• Stigsjöö Lars

Classifications

• F16C23/084

  sliding on a complementary spherical surface · CPC title

• F16C19/38

  with two or more rows of rollers · CPC title

• F16C33/4605 Primary

  Details of interaction of cage and race, e.g. retention or centring · CPC title

• F16C2240/80

  Pitch circle diameters [PCD] · CPC title

• F16C33/495

  formed as one piece cages, i.e. monoblock comb cages · CPC title