Cylindrical roller bearing and cage for cylindrical roller bearings

• US 7,594,761 B2
• Filed: 04/14/2004
• Issued: 09/29/2009
• Est. Priority Date: 04/15/2003
• Status: Active Grant

• Current Assignee: NTN Corporation
• Original Assignee: NTN Corporation
• Inventors: Mori, Masatsugu, Koyama, Mineo
• Primary Examiner(s): Hannon; Thomas R
• Assistant Examiner(s): KRAUSE, JUSTIN MITCHELL
• Application Number:
  US10/823,770
• Publication Number:
  US 20040234184A1
• Time in Patent Office: 1,994 Days
• Field of Search: 384/450, 384/470, 384/572, 384/576, 384/623
• US Class Current: 384/572
• CPC Class Codes: F16C 19/26 with a single row of rollers
• CPC Class Codes: F16C 2226/16 by wedge action, e.g. by tapered or conical parts
• CPC Class Codes: F16C 33/4635 made from plastic, e.g. injection moulded window cages
• CPC Class Codes: F16C 33/467 Details of individual pockets, e.g. shape or roller retaining means
• CPC Class Codes: F16C 35/077 between housing and outer race ring

Abstract

Let r be the radius of curvature of the corners of pockets of a cage, and Lw be the length of cylindrical rollers. They are set such that the relation r/Lw≧0.1 holds. Further, the relation r/k1≦1 holds, where k1 is the minimum dimension on the inner diameter side of the annulus of the cage.

Claims

1. A cylindrical roller bearing cage in combination with a plurality of cylindrical rollers comprising:

a pair of annuluses,

a plurality of columns interconnecting the annuluses, and

a plurality of pockets defined therein receiving the cylindrical rollers between adjacent columns, the pair of annuluses extending orthogonally relative to the columns,

wherein each column is provided with a pair of tongues extending radially away from a base of the column,

wherein each tongue of the pair of tongues is connected to a relatively planar bottom surface disposed between the pair of tongues by an arcuate surface disposed between each tongue of the pair of tongues and an end of the relatively planar bottom surface, each tongue having a planar end face that is coplanar with an outermost surface of a corresponding annulus of the pair of annuluses, and

wherein a relation r/Lw ≧

0.1 holds where r is a radius of curvature of corners of the pockets, and Lw is a length of the cylindrical rollers.

2. The cylindrical roller bearing cage in combination with a plurality of cylindrical rollers as set forth in claim 1, wherein a relation r/k1≦

1 holds, where k1 is a minimum dimension on an inner diameter side of an annulus of the cage between a pocket and the annulus in a direction that is parallel to a longitudinal axis of the cage.

3. The cylindrical roller bearing cage in combination with a plurality of cylindrical rollers as set forth in claim 1, wherein a relation w5·

Z/φ

d1·

π

>

0.1 holds, where φ

d1 is an inner diameter of the cage, w5 is a distance from a contact section of a pocket that contacts a cylindrical roller end surface to a column, and Z is a number of cylindrical rollers.

4. The cylindrical roller bearing cage in combination with a plurality of cylindrical rollers as set forth in claim 1, wherein a relation r<

k2+r1 holds, where k2 is an amount of projection of a contact section of the pocket for contact with a cylindrical roller end surface, and r1 is an axial chamfer of the cylindrical roller.

5. The cylindrical roller bearing cage in combination with a plurality of cylindrical rollers as set forth in claim 1, wherein an inner surface of each annulus defines a circumferential wall surface of a corresponding pocket and is provided with a raised contact surface for guiding an end surface of a corresponding cylindrical roller.

6. The cylindrical roller bearing cage in combination with a plurality of cylindrical rollers as set forth in claim 1, wherein a lateral surface of each column defines an axial wall surface of a corresponding pocket, the axial wall surface including a straight surface formed by a lateral surface of the base and an arcuate section formed by a lateral surface of a corresponding tongue, and wherein the straight surface and the arcuate section cooperate to define a guide surface for guiding a rolling surface of a corresponding cylindrical roller.

7. The cylindrical roller bearing cage in combination with a plurality of cylindrical rollers as set forth in claim 1, wherein inner lateral surfaces of each tongue are connected by a bottom surface defined on an outer surface of the base.

8. A cylindrical roller bearing comprising:

an inner ring having a raceway surface in an outer periphery,

an outer ring having a raceway surface in an inner periphery,

a plurality of cylindrical rollers rollably disposed between the raceway surface of the inner ring and the raceway surface of the outer ring, and

a resin cage holding the cylindrical rollers at predetermined intervals,

wherein said cage includes a pair of annuluses, a plurality of columns interconnecting the annuluses, and pockets defined therein for receiving cylindrical rollers between adjacent columns and which are radially positioned with respect to the cylindrical rollers, the pair of annuluses extending orthogonally relative to the columns,

wherein each column is provided with a pair of tongues extending radially away from a base of the column,

wherein each tongue of the pair of tongues is connected to a relatively planar bottom surface disposed between the pair of tongues by an arcuate surface disposed between each tongue of the pair of tongues and an end of the relatively planar bottom surface, each tongue having a planar end face that is coplanar with an outermost surface of a corresponding annulus from the pair of annuluses, and

wherein a relation r/Lw 0.1 holds where r is a radius of curvature of corners of the pockets, and Lw is a length of the cylindrical rollers.

9. The cylindrical roller bearing as set forth in claim 8, wherein a relation r/k1 ≦

1 holds, where k1 is a minimum dimension on an inner diameter side of an annulus of the cage between a pocket and the annulus in a direction that is parallel to a longitudinal axis of the cage.

10. The cylindrical roller bearing as set forth in claim 9, wherein a relation r <

k2+r1 holds, where k2 is an amount of projection of a contact section of the pocket for contact with a cylindrical roller end surface, and r1 is an axial chamfer of the cylindrical roller.

11. The cylindrical roller bearing as set forth in claim 8, wherein a relation r <

k2+r1 holds, where k2 is an amount of projection of a contact section of the pocket for contact with a cylindrical roller end surface, and r1 is an axial chamfer of the cylindrical roller.

12. The cylindrical roller bearing as set forth in claim 8, wherein a relation w5·

Z/φ

d1·

π

>

0.1 holds, where φ

d1 is an inner diameter of the cage, w5 is a distance from a contact section of a pocket that contacts a cylindrical roller end surface to a column, and Z is a number of cylindrical rollers.

13. The cylindrical roller bearing as set forth in claim 8, wherein an inner surface of each annulus defines a circumferential wall surface of a corresponding pocket and is provided with a raised contact surface for guiding an end surface of a corresponding cylindrical roller.

14. The cylindrical roller bearing as set forth in claim 8, wherein a lateral surface of each column defines an axial wall surface of a corresponding pocket, the axial wall surface including a straight surface formed by a lateral surface of the base and an arcuate section formed by a lateral surface of a corresponding tongue, and wherein the straight surface and the arcuate section cooperate to define a guide surface for guiding a rolling surface of a corresponding cylindrical roller.

15. The cylindrical roller bearing as set forth in claim 8, wherein inner lateral surfaces of each tongue are connected by a bottom surface defined on an outer surface of the base.