Taper roller bearing

Patent metadata

Field	Value
Publication number	US-10215233-B2
Application number	US-201515516813-A
Country	US
Kind code	B2
Filing date	Oct 23, 2015
Priority date	Oct 29, 2014
Publication date	Feb 26, 2019
Grant date	Feb 26, 2019

Abstract

A taper roller bearing includes: an inner ring, an outer ring, a plurality of taper rollers, and an annular cage. The cage includes a small-diameter annular portion on one side in a axial direction, a large-diameter annular portion which is positioned on the other side in the axial direction and on a radial outer side of a large flange of the inner ring, and a plurality of column portions which link the small-diameter annular portion and the large-diameter annular portion. The taper roller bearing has a labyrinth structure which suppresses a flow of lubricating oil to the outside of the bearing from the inside of the bearing between the large flange and the large-diameter annular portion.

First claim

The invention claimed is:

1. A taper roller bearing comprising:
an inner ring that includes a small flange that is positioned on a first side in an axial direction and that protrudes to an outer side in a radial direction, and a large flange that is positioned on a second side in the axial direction and that protrudes to the outer side in the radial direction;
an outer ring that is positioned on the outer side in the radial direction of the inner ring;
a plurality of taper rollers that are positioned between the inner ring and the outer ring; and
an annular cage that holds the plurality of taper rollers at an interval in the circumferential direction,
wherein:
the cage includes a small-diameter annular portion that is positioned on one side of the cage, a large-diameter annular portion that is positioned on an opposite side of the cage and on the outer side in the radial direction of the large flange, and a plurality of column portions that link the small-diameter annular portion and the large-diameter annular portion with each other, and
a labyrinth structure, which suppresses a flow of lubricating oil from inside the taper roller bearing to outside the taper roller bearing, is provided between the large flange and the large-diameter annular portion, the labyrinth structure including an annular enlarged space portion that is disposed axially between a flange surface of the large flange and a radially inward surface of the large-diameter annular portion.

2. The taper roller bearing according to claim 1 , wherein:
an inner circumferential surface of the large-diameter annular portion includes a first inner circumferential surface portion and a second inner circumferential surface portion having a diameter larger than a diameter of the first inner circumferential surface portion, and
an outer circumferential surface of the large flange includes a first outer circumferential surface portion opposing to the first inner circumferential surface portion with a fine clearance, and a second outer circumferential surface portion having a diameter that is larger than a diameter of the first outer circumferential surface portion and opposing to the second inner circumferential surface portion with a fine clearance.

3. The taper roller bearing according to claim 1 ,
wherein the small-diameter annular portion blocks an annular opening portion formed between the small flange and the outer ring, having fine clearances between the small-diameter annular portion and the small flange and between the small-diameter annular portion and the outer ring, respectively.

4. The taper roller bearing according to claim 1 , wherein:
spaces formed between the large-diameter annular portion and the small-diameter annular portion and between the column portions adjacent to each other in the circumferential direction are pockets that hold the taper rollers, and
cut-out portions that are continuous with the pockets are provided on the outer circumferential side of the large-diameter annular portion.

5. The taper roller bearing according to claim 1 , wherein on a radial outer side of the column portions, a recess portion is provided, the recess portion being recessed in the radial direction and allowing adjacent pockets to communicate with each other,
a depth of an end on the recess portion on an axial side is zero and a bottom surface of the recess portion has a shape of an inclined surface that is inclined as approaching the radial outer side toward the second side.

6. The taper roller bearing according to claim 1 , wherein in a radial inner surface of the column portions, a groove is disposed such that the groove extends along a longitudinal direction of the column portions,
the groove having a groove side surface that intersects with the groove longitudinal direction on a first axial side and that is closed on a second axial side.

Assignees

• Jtekt Corp

Inventors

• Kamamoto Shigeo
• Murata Junji
• Shishihara Yuki

Classifications

• F16C33/4676

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

• F16C33/4635

  made from plastic, e.g. injection moulded window cages · CPC title

• F16C2240/46

  Gap sizes or clearances · CPC title

• F16C33/6681

  Details of distribution or circulation inside the bearing, e.g. grooves on the cage or passages in the rolling elements · CPC title

• F16C2300/02

  General use or purpose, i.e. no use, purpose, special adaptation or modification indicated or a wide variety of uses mentioned · CPC title