Bearings – Rotary bearing – Antifriction bearing
Reexamination Certificate
1999-01-08
2001-06-05
Bucci, David A. (Department: 3682)
Bearings
Rotary bearing
Antifriction bearing
C277S551000
Reexamination Certificate
active
06241396
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention related to a sealing device for a rolling bearing for isolating the bearing from outside to prevent water, scales from entering the interior of the bearing and rolling element lubricant e.g., grease or oil air lubricant from leaking out of the bearing.
A tern “seal holder portion” means a portion on which a seal body is mounted, which formed within a seal holder being separately provided and closely engaged with the end face of an outer ring or a portion on which the seal body is mounted, which is directly formed on the end of the outer ring without mounting of a seal holder separately provided.
FIGS. 20A and 20B
shows a sealing device
100
for a four-raw tapered roller bearing used mainly for a steel rolling mill. A sealing device of the type in which a sealing member
700
is fit into a seal holder portion
602
of a ring-like seal holder
600
is typically known.
Another sealing device
101
not provided with a separate seal holder as shown in
FIG. 21
is also known. In the sealing device
101
, a sealing member
700
is fit into the seal holder portion
602
directly formed on the outer ring.
In the sealing device
100
of
FIGS. 20A and 20B
, to seal the bearing, the side wall of the seal holder
600
is brought into close contact with an outer ring
200
, and a lip portion
701
of the sealing member
700
is made to slidably contact with the outer peripheral surface
301
of an inner ring
300
. The same thing is correspondingly applied to the sealing device of FIG.
21
.
Reference is made to FIG.
20
A. The bearing includes a cage type holder
500
. The bottom
501
of the cage type holder
500
(so called as a retainer) is positioned off the bearing width C. In other words, the bottom
501
of the cage type holder
500
is protruded from the side edge of the outer ring
200
.
In order to avoid the interference among the cage type holder
500
, the sealing member
700
and the seal holder
600
, it is necessary to increase the width of the seal holder
600
and to locate the soaling member
700
close to outside. Such a structural requirement limits the space or a bearing unit, and hence of necessity reduces the load capacity. To cope with this, a sealing device as shown in
FIG. 20B
is proposed.
In the sealing device
100
of
FIG. 20B
, the sealing member
700
includes a recessed portion
702
. The space
703
defined by the recessed portion
702
may receive the bottom
501
of the cage type holder
500
. This structural feature brings about advantages: no interference of the cage type holder
500
with the sealing member
700
, the width reduction of the seal holder
600
, and the increase of the load capacity of the bearing.
The four-raw tapered roller bearing must be attached to and detached from the chock in a state that it is assembled and sealed. Because of this, the necessity is to use a bearing suspending tool
800
(FIG.
19
), used for-only the purpose of bearing suspension.
In the sealing device of
FIG. 20B
, the recessed portion
702
is horizontally extended from a flange portion
704
sandwiched between a groove
601
of the seal holder
600
and the end face of the outer ring. The structure ensues the increase of the inside diameter of the seal holder
600
, and the height of the sealing member
700
when viewed in cross section. For this reason, the
FIG. 20B
sealing device rejects the use of the bearing suspending tool
800
when an assembly of the sealing device and the bearing is attached to the chock through the bearing suspending tool.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a sealing device for a rolling bearing which is capable of satisfying the requirement for eliminating the interference of the sealing member with the cage type holder of the bearing, maintaining the high load capacity performance, and accepting the bearing suspending tool usually used for the bearing.
The above object can also be achieved by a sealing device for a roll bearing having a seal holder portion of a seal holder, separately provided, which is directly formed on or closely engaged with an outer ring, and a seal body attached to said seal holder portion, wherein one end of a holder is put into a seal space of said seal holder portion so as to avoid its interference with said seal body,
the improvement being characterized in that the inside diameter of said seal holder portion is reduced. With this unique structure, a set space for a bearing suspending tool is secured.
More specifically, the inside diameter of the seal holder portion is minimized in a sealing device in which
1) a seal is mounted on a seal holder portion as a portion on which a seal body is mounted, which formed within a seal holder being separately provided and closely engaged with the end face of an outer ring or a portion on which the seal body is mounted, which is directly formed on the end of the outer ring without mounting of a seal holder separately provided, and
2) the seal body slidably contacts with the outer peripheral surface of the inner ring,
whereby the bearing is isolated from outside.
In the sealing device constructed described above, the seal body is structured so as to withstand a pressure created when said bearing is lifted. Specifically, the seal body has such a seal structure including a metal ring (reinforcing core member) with a large or irregular cross-sectional area and enabling a seal to be directly lifted with a bearing suspending tool.
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Aizawa Tomoyuki
Magami Hidenobu
Shimomura Yuji
Takamura Toshiharu
Tanaka Sadayuki
Bucci David A.
Hansen Colby
NSK Ltd.
Sughrue Mion Zinn Macpeak & Seas, PLLC
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