Tapered roller bearing

Patent metadata

Field	Value
Publication number	US-9683605-B2
Application number	US-201514973103-A
Country	US
Kind code	B2
Filing date	Dec 17, 2015
Priority date	Dec 26, 2014
Publication date	Jun 20, 2017
Grant date	Jun 20, 2017

Abstract

An inner ring has a rib face as a concave surface that is formed on the larger diameter side of an inner ring and that contacts large end faces of tapered rollers. A tapered roller bearing satisfies Ri>R≧Rr, where Rr represents a curvature radius of the large end face, Ri represents a curvature radius of the rib face 8 in a longitudinal section of the inner ring 2 , R represents a distance from a cone center to a reference point. The distance R is the distance from the cone center to the reference point, where the reference point is the intersection of the rib face and an imaginary line extending from the cone center and along an inner ring raceway surface in the longitudinal section of the inner ring 2 . Surface roughness of the rib face is greater than that of the large end face.

First claim

What is claimed is:

1. A tapered roller bearing, comprising:
an inner ring having a tapered inner ring raceway surface;
an outer ring having a tapered outer ring raceway surface;
a plurality of tapered rollers configured to roll on the inner ring raceway surface and the outer race raceway surface and each tapered roller having a large end face formed of a convex surface; and
an annular cage that retains the plurality of tapered rollers at intervals in a circumferential direction, wherein:
the inner ring has a rib face that is provided on a larger diameter side of the inner ring and that contacts the large end face,
a surface roughness of the rib face is greater than that of the large end face,
the rib face is a concave surface, and
the tapered roller bearing satisfies Ri>R≧Rr, where:
Rr represents a curvature radius of the large end face,
Ri represents a curvature radius of the rib face in a longitudinal section of the inner ring, and
R represents a distance from a cone center to a reference point, the reference point being an intersection of the rib face and an imaginary line extending from the cone center and along the inner ring raceway surface in the longitudinal section of the inner ring.

2. The tapered roller bearing according to claim 1 , wherein
the surface roughness of the rib face is 0.1 μmRa or more.

3. The tapered roller bearing according to claim 2 , wherein
the large end face has a recess formed in a range of a contact ellipse formed by contact between the large end face and the rib face.

4. The tapered roller bearing according to claim 1 , wherein
the large end face has a recess formed in a range of a contact ellipse formed by contact between the large end face and the rib face.

Assignees

• Jtekt Corp

Inventors

• Murata Junji
• Kamamoto Shigeo
• Shishihara Yuki

Classifications

• F16C33/366

  Tapered rollers, i.e. rollers generally shaped as truncated cones · CPC title

• F16C33/585 Primary

  of raceways, e.g. ribs to guide the rollers · CPC title

• F16C19/364 Primary

  with tapered rollers, i.e. rollers having essentially the shape of a truncated cone · CPC title

• F16C2240/54

  Surface roughness · 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