TAPER ROLLER BEARING

• US 20170307015A1
• Filed: 10/23/2015
• Published: 10/26/2017
• Est. Priority Date: 10/29/2014
• Status: Active Grant

• Current Assignee: Jtekt Corporation (Toyota Motor Corporation)
• Original Assignee: Jtekt Corporation (Toyota Motor Corporation)
• Inventors: KAMAMOTO, Shigeo, MURATA, Junji, SHISHIHARA, Yuki
• Granted Patent: US 10,215,233 B2
• Time in Patent Office: Days
• CPC Class Codes: F16C 19/364 with tapered rollers, i.e. rollers having essentially the shape of a truncated cone
• CPC Class Codes: F16C 2220/04 by injection-moulding
• CPC Class Codes: F16C 2240/46 Gap sizes or clearances
• CPC Class Codes: F16C 2300/02 General use or purpose, i.e. no use, purpose, special adaptation or modification indicated or a wide variety of uses mentioned
• CPC Class Codes: F16C 33/4605 Details of interaction of cage and race, e.g. retention or centring
• CPC Class Codes: F16C 33/4635 made from plastic, e.g. injection moulded window cages
• CPC Class Codes: F16C 33/4676 of the stays separating adjacent cage pockets, e.g. guide means for the bearing-surface of the rollers
• CPC Class Codes: F16C 33/664 Retaining the liquid in or near the bearing
• CPC Class Codes: F16C 33/6674 related to the amount supplied, e.g. gaps to restrict flow of the liquid
• CPC Class Codes: F16C 33/6681 Details of distribution or circulation inside the bearing, e.g. grooves on the cage or passages in the rolling elements
• CPC Class Codes: F16C 33/80 Labyrinth sealings F16C33/761 takes precedence

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.

Claims

1. A taper roller bearing comprising:

an inner ring which includes a small flange that is positioned on one side in an axial direction and protrudes to an outer side in a radial direction, and a large flange that is positioned on the other axial side and protrudes to the outer side in the radial direction;

an outer ring which is positioned on the outer side in the radial direction of the inner ring;

a plurality of taper rollers which are positioned between the inner ring and the outer ring; and

an annular cage which holds the plurality of taper rollers at an interval in the circumferential direction,

wherein the cage includes a small-diameter annular portion which is positioned on one side, a large-diameter annular portion which is positioned on the other side and on the outer side in the radial direction of the large flange, and a plurality of column portions which link the small-diameter annular portion and the large-diameter annular portion to each other, and wherein a labyrinth structure which suppresses a flow of lubricating oil to the outside of the taper roller bearing from the inside of the taper roller bearing is provided between the large flange and 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 wherein 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 which holds the taper rollers, and

wherein cut-out portions which are continuous to the pockets are provided on the outer circumferential side of the large-diameter annular portion.