Retainer for roller bearing

Details Retainer for roller bearing Retainer for roller bearing

2002-02-15

2003-07-29

Footland, Lenard A (Department: 3682)

Bearings

Rotary bearing

Antifriction bearing

C384S572000

Reexamination Certificate

active

06599019

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a retainer for use in a roller bearing.
2. Description of the Related Art
As shown in
FIG. 16A
, a retainer
90
includes a comb-like annular body
95
, a ring-like cover
94
, and a rivet
96
connecting the comb-like annular body
95
to the ring-like cover
94
. The retainer
90
is an annular body having a pair of annular portions
92
,
94
provided on the axial sides of a pocket
91
and a plurality of columns
93
connecting the pair of annular portions
92
,
94
provided on the circumferential sides of the pocket
91
. In other words, the rectangular pocket
91
is defined by the annular portions
92
and
94
and the column
93
.
The pocket
91
of the retainer
90
has four corners. The comb-like annular body
95
has corners formed in an arc having a radius Rc of curvature. The radius Rc of curvature is predetermined to be smaller than the length of the chamfer of the end of a roller (not shown) to avoid an interference with the roller received in the pocket
91
.
FIG. 16B
is a sectional view taken on the line B-B of
FIG. 16A
illustrating a section of the column
93
.
An important problem for the enhancement of the strength of the retainer
90
is how the strength of the corners of the pocket
91
onto which stress is concentrated is enhanced.
In order to relax the concentration of stress onto the corners of the pocket
91
, it is proposed that the radius Rc of curvature of the corners of the pocket
91
be raised. However, this causes interference of the corners with the chamfer of the end of the roller, Thus, the radius Rc of curvature cannot be raised too much, occasionally making the relaxation effect insufficient.
SUMMARY OF THE INVENTION
The invention has been worked out under these circumstances. An aim of the invention is to provide a retainer for roller bearing having a drastically enhancement of the strength of the corners of the pocket and hence the retainer can be attained by a simple structure.
The foregoing aim of the invention is accomplished by the following constitution of retainer.
A retainer for roller bearing comprising a pair of annular portions, a plurality of columns provided between the annular portions and a plurality of pockets defined by the annular portion and the column each for receiving a roller, wherein an indented relief is provided on the corners of the plurality of pockets and the circumferential average width d (mm) of the column at the area where the indented relief is provided, the axial thickness t (mm) of the annular portion at the area where the indented relief is provided, the radius r (mm) of curvature of the indented relief, the average diameter Da (mm) of the roller and the pitch circle diameter dm (mm) of the roller bearing satisfy the following relationship [1]:
0.07×
dm+
20≦(2/
d+
4/
t+
1/
r
)×
Da≦
0.07×
dm+
50  [1]
In accordance with the foregoing retainer for roller bearing, the indented relief
15
having a predetermined size provided on the corners of the pocket
11
make it possible to remarkably relax the concentration of stress onto the corners of the pocket of the retainer (e.g., retainer for cylindrical roller bearing)
10
as shown in FIG.
1
. Thus, the strength of the retainer
10
can be drastically enhanced.
Further, as shown in
FIG. 2
, the indented relief
15
provided on the corners of the pocket
11
form a passage communicating the space on the outer ring side (space between the retainer
10
and the outer ring (not shown)) to the space on the inner ring side (space between the retainer
10
and the inner ring
18
). The lubricant attached to the surface of the rollers
19
is partly scratched off by the column
13
of the retainer
10
but is not scratched off the column
13
at the indented relieves
15
so that it moves, e.g., from the space on the outer ring side to the space on the inner ring side. Since the indented relief
15
is disposed very close to the position at which the rib
18
a
provided on the inner ring
18
or the like and the end face of the roller
19
come in contact with each other, the lubricant is sufficiently supplied into the contact position
18
b
. In this arrangement, troubles such as seizing and abrasion on the contact position
18
b
can be prevented, making it possible to improve the bearing performance.


REFERENCES:
patent: 6132102 (2000-10-01), Bessone et al.
patent: 10253747 (1998-09-01), None
patent: 10267038 (1998-10-01), None
patent: 2001-12477 (2001-01-01), None

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