Roller bearing, retainer segment of roller bearing for supporting main shaft of wind-power generator

Patent metadata

Field	Value
Publication number	US-9664231-B2
Application number	US-201514692840-A
Country	US
Kind code	B2
Filing date	Apr 22, 2015
Priority date	Sep 8, 2006
Publication date	May 30, 2017
Grant date	May 30, 2017

Abstract

A tapered roller bearing ( 31 a ) has a plurality of retainer segments ( 11 a, 11 d ) each having a pocket to house a tapered roller ( 34 a ), and arranged so as to be continuously lined with each other in a circumferential direction between an outer ring ( 32 a ) and an inner ring ( 33 a ). The retainer segment ( 11 a, 11 d ) is formed of a resin containing a filler material to lower a thermal linear expansion coefficient. In addition, a clearance ( 39 a ) is provided between the first retainer segment ( 11 a ) and the last retainer segment ( 11 d ) after the plurality of retainer segments ( 11 a, 11 d ) have been arranged in the circumferential direction without providing any clearance. Here a circumferential range (R) of the clearance ( 39 a ) is larger than 0.075% of a circumference of a circle passing through a center of the retainer segment ( 11 a, 11 d ) and smaller than 0.12% thereof at room temperature.

First claim

The invention claimed is:

1. A roller bearing comprising:
an outer ring;
an inner ring;
a plurality of rollers arranged between said outer ring and said inner ring; and
a plurality of retainer segments each having a pocket to house said roller, and arranged so as to be continuously lined with each other in a circumferential direction between said outer ring and said inner ring, wherein
said retainer segment is formed of a resin containing a filler material to lower a thermal linear expansion coefficient,
a clearance is provided between the first retainer segment and the last retainer segment after said plurality of retainer segments have been arranged in the circumferential direction without providing any clearance, and
a circumferential range of said clearance is larger than 0.075% of a circumference of a circle passing through a center of said retainer segment and smaller than 0.12% thereof, at room temperature, wherein
said retainer segment has a plurality of column parts extending along a rotation axis of the bearing so as to form pockets to house said rollers, and a connection part extending in the circumferential direction so as to connect the plurality of column parts,
said retainer segment guides said rollers, and
one guide click having a contact part with said roller and a recess part formed on the circumferential inner side of said contact part are provided at a side wall surface of said column part.

2. The roller bearing according to claim 1 , wherein
said guide click is provided in the center of the side wall surface of said column part in a roller length direction.

3. The roller bearing according to claim 1 , wherein
a length of said guide click in the roller length direction is roughly equal to an entire length of said pocket in the roller length direction.

4. The roller bearing according to claim 1 , wherein
said recess part is formed by shrinkage generated when said retainer segment is molded.

5. The roller bearing according to claim 1 , wherein
an angle at a corner part positioned at a tip end of said guide click is an obtuse angle in a section provided by cutting said retainer segment by a plane passing through said guide click and crossing a rotation axis of said bearing at right angles.

6. The roller bearing according to claim 5 , wherein
said corner part is chamfered.

7. The roller bearing according to claim 6 , wherein
said chamfered part is a R-chamfered part.

8. A main shaft support structure of a wind-power generator, comprising:
a blade receiving wind power;
a main shaft having one end fixed to said blade and rotating together with said blade; and
a roller bearing assembled in a fix member to support said main shaft rotatably, wherein
said roller bearing has an outer ring, an inner ring, a plurality of rollers arranged between said outer ring and said inner ring, and a plurality of retainer segments each having a pocket to house said roller, and arranged so as to be continuously lined with each other in a circumferential direction between said outer ring and said inner ring,
said retainer segment is formed of a resin containing a filler material to lower a thermal linear expansion coefficient,
a clearance is provided between the first retainer segment and the last retainer segment after said plurality of retainer segments have been arranged in the circumferential direction without providing any clearance, and
a circumferential range of said clearance is larger than 0.075% of a circumference of a circle passing through a center of said retainer segment and smaller than 0.12% thereof at room temperature,
wherein
said retainer segment has a plurality of column parts extending along a rotation axis of the bearing so as to form pockets to house said rollers, and a connection part extending in the circumferential direction so as to connect the plurality of column parts,
said retainer segment guides said rollers, and
one guide click having a contact part with said roller and a recess part formed on the circumferential inner side of said contact part are provided at a side wall surface of said column part.

Assignees

• Ntn Toyo Bearing Co Ltd

Inventors

• Omoto Tatsuya
• Nakamizo Eiichi
• Sakaguchi Tomoya

Classifications

• F05B2250/232

  conical · CPC title

• F16C33/4676

  of the stays separating adjacent cage pockets, e.g. guide means for the bearing-surface of the rollers · CPC title

• F16C2208/36

  Polyarylene ether ketones [PAEK], e.g. PEK, PEEK (F16C2208/58 takes precedence) · CPC title

• F16C2300/14

  Large applications, e.g. bearings having an inner diameter exceeding 500 mm · CPC title

• F05C2253/20

  Resin · CPC title