Sealing device for a rolling contact bearing

Details Sealing device for a rolling contact bearing Sealing device for a rolling contact bearing

1999-03-05

2001-01-09

Lorence, Richard M. (Department: 3681)

Bearings

Rotary bearing

Antifriction bearing

C384S484000, C384S486000, C277S551000

Reexamination Certificate

active

06170992

ABSTRACT:

TECHNICAL FIELD
The present invention refers to a sealing device for a rolling contact bearing.
BACKGROUND
In the rolling bearing contact industry there is currently a tendency to integrate sealing devices between the non-rotating race and the rotating race of the bearing with a magnetised encoder wheel which forms part of a device for measuring the relative rotation speed between the bearing races.
The accompanying drawings
1
and
2
show an example of such a well-known technique. A rolling contact bearing, comprised of a non-rotating outer race
10
, a rotating inner race
11
and two series of rotating elements
12
, in this case spheres, is provided with a pair of sealing devices, indicated overall with the number
14
, arranged on both sides of the bearing to hermetically close the space between the races
10
and
11
. A metallic annular insert
15
, firmly force fitted onto the non-rotating outer race
10
, bears an annular sealing covering
16
which forms a pair of lips
17
,
18
, which slide against a metallic annular insert
19
onto which is vulcanised an annular rubber element
20
; the rubberised insert
19
is then forcefully fitted onto the inner rotating race
11
of the bearing. The rotating insert
19
has a substantially L-shaped axial section, in which there is a cylindrical wall
21
, which the lip
17
(defined here as radial) slides against and a radial wall in the form of a disc
22
, which the lip
18
(defined here as axial) slides against.
The part
20
a
of the rubber element
20
which covers the axially outer side
22
b
of the disc-shaped wall
22
is charged with metallic particles to form an encoder wheel which, when it rotates, generates impulses of a frequency proportional to the rotation speed of the rotating race
11
in a fixed sensor facing said encoder wheel, which is not illustrated here for the sake of simplicity.
In order to assemble the two inserts
15
,
19
with their respective rubber units
16
,
20
onto the bearing in a single driving operation in which these two coupled units are forcefully thrust in an axial direction, it is indispensable that the two inserts with their relative rubber elements are reciprocally positioned in the correct fashion, according to the arrangement illustrated in FIG.
2
.
Given the particular arrangement of the sealing lips of the watertight shield, the coupling between the two units derives solely from the radial thrust which the radial lip
17
exerts against the wall
21
, while the axial thrust exerted by axial lip
18
against the axially inner surface
22
a
of the wall
22
tends to separate the two units.
It is not easy to obtain this state in practice, due to other factors which tend to separate the two units, such as for example shock or impact sustained during transport.
In case one or both of the sealing covering lips should slip from their operating position which is set during the pre-assembly step, there is a risk that the sealing device of the bearing could be assembled in an incorrect arrangement in which the lips
17
,
18
do not come into contact with the respective walls
21
,
22
. This results in the malfunction of the sealing device and thus shortens the working life of the bearing due to insufficient sealing action.
SUMMARY
An aim of the present invention is to suggest a reliable solution which always ensures that the units forming the sealing device are positioned correctly, in particular the lips of the sealing covering.
Another aim of the present invention is to realise a device that will make assembling the sealing device onto the bearing easier and faster.
These and other aims and advantages, that will be better understood hereinafter, are achieved according to the present invention by a device with the characteristics described according to claim
1
. Other important characteristics of the present invention are described in the dependent claims.


REFERENCES:
patent: 4708497 (1987-11-01), Lederman
patent: 4848776 (1989-07-01), Winckler
patent: 5096207 (1992-03-01), Seeh et al.
patent: 5215387 (1993-06-01), Bertetti et al.
patent: 5269536 (1993-12-01), Matsushima et al.
patent: 70 34 015 (1970-09-01), None
patent: 43 38 261 (1994-05-01), None
patent: 0 156 552 (1985-10-01), None
patent: 2 207 470 (1989-02-01), None
patent: 94A000596 (1994-07-01), None

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