Retainer for a bearing and a ball bearing

Details Retainer for a bearing and a ball bearing Retainer for a bearing and a ball bearing

1999-10-18

2001-08-14

Marmor, Charles A (Department: 3681)

Bearings

Rotary bearing

Antifriction bearing

C384S526000

Reexamination Certificate

active

06273615

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a retainer for balls to be used for a rolling bearing in particular a ball bearing provided with such retainer.
2. Related Art
As shown in
FIG. 3
, normally in a ball bearing, a plurality of balls
5
are interposed between a raceway surface
2
of an inner ring
1
and a raceway surface
4
of an outer ring
3
and these balls
5
are kept at an even spacing and circumferential by a retainer
6
. Conventionally, a crown shape type retainer, provided with a plurality of pockets
7
to hold the plurality of aforesaid balls
5
at even spacing and circumferential, has often been used as the retainer
6
for such a ball bearing. For reference, in
FIG. 4
, W designates a thickness of the retainer
6
in the direction of the ball and H designates a height of the retainer
6
in an axial direction of a shaft to be received by this ball bearing, which are called hereinafter W direction and H direction respectively.
In this crown type retainer, the ball rolling surface
8
in the pocket
7
, as shown in
FIG. 5
showing a conventional manner, has a radius R
R
larger than the radius R
B
of the ball
5
and is set on the spherical surface of another sphere surface having its center on the O
o
which is the center of the pocket
7
, accordingly between the ball rolling surface
8
and the ball
5
held in the pocket
7
, there is adapted to set a predetermined gap 2&dgr; normally.
By the way, in the above ball bearing, in order to increase a revolution precision, prevent a surface coarsening, diminish a friction heat, control a vibration and control a wearing, after assembling a bearing, a lubricant such as a grease is adapted to be furnished on the ball rolling surface
8
and the raceway surfaces
2
,
4
of the inner and outer ring
1
and
3
.
However, according to the above conventional retainer
6
, the ball rolling surface
8
is settled in one spherical surface; as shown in
FIG. 6
, when, after the ball
5
is displaced in the W direction by &Dgr; X or in the H direction by &Dgr; Y, and a further displacement of the ball
5
is limited, the ball
5
has fallen in a state where it becomes tightly to get in touch with an edge
9
a
of the width W direction of the pocket
7
or and edge
9
b
(see
FIG. 6
too) of the H direction of the pocket
7
(wedgewise), thereby, as shown in
FIG. 6
, the lubricant is prevented from entering the ball rolling surface
8
, and there occurs a phenomenon where the lubricant G deposits outside the edges
9
a
,
9
b.
And, when such phenomenon is generated, between the ball rolling surface
8
and the ball
5
and the ball
5
and the raceway surfaces
2
,
4
of the inner, outer rings, so called a grease deficiency state is generated, which invites first not only a deterioration of revolution precision, but also an increase of surface coarsening, friction heating, vibration and wearing to decrease the bearing property as well as to reduce the life of bearing.
SUMMARY OF THE INVENTION
The present invention has been made to solve the above problem, and an object of which is to provide a retainer which ensures the lubricant to enter smoothly the ball rolling surface to contribute greatly for maintaining the stable bearing property and prolonging the bearing life, and to provide a rolling bearing using this retainer.
In order to attain the above object the retainer relating to the present invention, in a retainer having a plurality of pockets to hold a plurality of rolling element at an equal spacing in the circumferential direction on one circumferential edge, in an inside portion of the ball rolling surface provided in the pocket from the edge which is determined from both of the width and height direction of the pocket, a ball contact portion to prevent the ball displacement is provided to form a gap between the ball rolling surface which is located near to the edge side and the ball prevented to be displaced.
In the rolling bearing thus constructed with the retainer, during using, the lubricant can enter smoothly the ball rolling surface making use of the gap between the ball rolling surface of the pocket and the ball.
The ball rolling surface in the present invention can be formed from two spherical surfaces having a diameter larger than the one of the ball, the centers of which are located on the pitch circle of the pocket and are separated from each other, and the two ball rolling surfaces in the two spherical surfaces can form by being connected at the bottom of the pockets. By thus forming, between the edge side portion of the ball supporting portion and the ball, a gap is easily formed.
In this case, at the connecting portion of the two spherical surfaces a flat portion parallel to another circumference edge opposite to the edge where the pocket is be provided, and thereby, a thickness of the pocket is increased to become advantageous from the view point of strength.


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patent: 2038095 (1936-04-01), Bott
patent: 3486212 (1969-12-01), Vannest
patent: 3749461 (1973-07-01), Liss et al.
patent: 4136915 (1979-01-01), Derner
patent: 4225199 (1980-09-01), Earsley
patent: 4963040 (1990-10-01), Takebayashi et al.
patent: 5539844 (1996-07-01), Tazumi et al.
patent: 5553949 (1996-09-01), Fukuwaka et al.
patent: 6068408 (2000-05-01), Mutoh et al.
patent: 6074099 (2000-06-01), Mutou et al.
patent: 488166 (1938-07-01), None
patent: 580286 (1946-09-01), None
patent: 7-208482 (1995-08-01), None

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