Bearings – Rotary bearing – Antifriction bearing
Reexamination Certificate
2001-06-05
2003-02-18
Footland, Lenard A. (Department: 3682)
Bearings
Rotary bearing
Antifriction bearing
Reexamination Certificate
active
06520683
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a seal ring, a sealing device and a rolling bearing including the same.
2. Description of the Related Art
The inventor of the present invention newly developed a wheel speed detector for controlling the antilock brake of an automobile as shown in
FIGS. 3 and 4
. This detector is integrated into a sealing device
102
installed to a double-row rolling bearing
101
for wheel support. The detector detects a wheel speed using a magnetic sensor
111
and a pulsar ring
113
. The sealing device
102
is comprised of the first seal ring
103
and the second seal ring
104
.
The first seal ring
103
is attached to the outer ring side of the bearing
101
and constituted by attaching lips
106
and
107
to an annular body
105
.
The second seal ring
104
is attached to the inner ring side of the bearing
101
and constituted by attaching lips
109
and
110
to an annular body
108
.
The magnetic sensor
111
is molded on the outer periphery of the annular body
105
of the first seal ring
103
by a resin member
112
. The pulsar ring
113
is bonded to the inner periphery of the annular body
108
of the second seal ring
104
at a position at which the ring
113
faces the magnetic sensor
111
in diameter direction.
The pulsar ring
113
is formed by forming rubber containing magnetic powder by vulcanization. The pulsar ring
113
is magnetized in a manner, for example, in which the polarity of the ring
113
is changed alternately in circumferential direction.
At the first stage of manufacturing the second seal ring
104
, the pulsar ring
113
is bonded to the annular body
108
by vulcanization forming. At the second stage thereof, the axial lip
109
and radial lip
110
, both made of rubber, are bonded to the inner side surface and the outer peripheral surface of the pulsar ring
113
, respectively, by vulcanization forming.
In the above case, the lips
109
and
110
of the second seal ring
104
are provided on the inner side surface and the outer peripheral surface of the pulsar ring
113
, respectively, at positions away from each other. Due to this, there is a possibility that the pulsar ring
113
is disadvantageously shifted by molten rubber inflow pressure during the vulcanization forming of the second stage. It is, therefore, difficult to control vulcanization conditions.
SUMMARY OF THE INVENTION
The main object of the present invention is, therefore, to provide a seal ring capable of preventing the positional shift of a pulsar ring in the course of vulcanization-forming lips.
The other objects of the present invention as well as features and advantages thereof will become clear from the description which follows.
In short, the present invention is a seal ring attached to a shoulder portion of a bearing ring of a rolling bearing, and comprising an annular body; a pulsar ring made of magnetized rubber, and bonded to a required position of the annular body by vulcanization forming; a first lip made of magnetized rubber, and formed integrally with the pulsar ring; and a second lip bonded to the pulsar ring by vulcanization forming.
It is preferable that the pulsar ring has different magnetic poles alternately in circumferential direction provided on an outside diameter surface of the pulsar ring.
It is preferable that the pulsar ring is formed by mixing magnetic powder with rubber, and that a content of the magnetic powder in the rubber is set to fall within a range between a lower limit of 60 mass % and an upper limit of 90 mass %.
It is preferable that the annular body includes a cylindrical portion fixed to an inner ring provided at the rolling bearing; and a disk portion directed outward in diameter direction on an axially one end portion of the cylindrical portion, that the pulsar ring is bonded to an inner surface of the disk portion, that the first lip is formed integrally with the outer peripheral surface of the pulsar ring, and that the second lip is bonded to an inner side surface of the pulsar ring.
REFERENCES:
patent: 4946295 (1990-08-01), Hajzler
patent: 4948277 (1990-08-01), Alff
patent: 4968156 (1990-11-01), Hajzler
patent: 5195830 (1993-03-01), Caillault et al.
patent: 59164457 (1984-09-01), None
Arai Hirokazu
Kasahara Fumiaki
Sentoku Minoru
Tamura Tomomitsu
Toda Kazutoshi
Footland Lenard A.
Jordan and Hamburg LLP
Koyo Seiko Co. Ltd.
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