JP2589033Y2 - Rolling bearing sealing device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling bearing sealing device for preventing water from entering the inside of a rolling bearing from the outside.

[0002]

2. Description of the Related Art Conventionally, as a sealing device for a rolling bearing, as shown in FIG.
1, a seal core metal 21 having a flange 21a is provided at the end of the inner ring surface 20a of the outer ring 20 as shown in FIG.
2 having a flange 23a at the end of the outer diameter surface 22a.
It is known that a seal lip 24 is attached to the lower end of the core 21 and the lower surface thereof is pressed against the flange 23 a of the core 23.

[0003]

In the above-mentioned prior art, the seal is to prevent oil and grease from leaking, and to prevent foreign matter from entering from outside. However, the undercarriage of the automobile is severe, and especially when the vehicle is immersed in a puddle, the seal portion alone may not be enough to prevent water from entering.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems by fixing a first metal core having a flange at an end of an inner ring surface of an outer ring and an end of an outer diameter surface of an inner ring. A second core having a flange opposed to the flange of the core is fixed, a seal lip is provided on one of the cores to form a seal portion with the other core, and the seal is provided. A water-absorbing polymer member is attached to one of the opposing surfaces of both cores on the outer side of the bearing, and the water-absorbing polymer swells due to water absorption.
In this case, the gap is closed .

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The first embodiment of the present invention shown in FIGS. 1 and 2 will be described in detail. Reference numeral 1 denotes an outer ring which fixes a first metal core 2 having a flange 2a at an end of an inner diameter surface 1a, and a flange 4a facing the flange 2a at an end of an outer diameter surface 3a of the inner ring 3.
Is fixed, a seal lip 5 is attached to one of the metal cores 2 and pressed against a flange 4a of the metal core 4 to form a seal portion, and the seal portion is formed on the outer side of the bearing from the seal portion. A water-absorbing polymer member 6 is fixed to one of the cores 4 on the opposing surfaces of the cores 2 and 4 with a predetermined gap 7 between the core 2 and the core 2. 20 ° C to 30 ° C for the water-absorbing polymer member 6
A heat-sensitive gel that changes state at the boundary, absorbs and swells at low temperatures, and releases and shrinks at high temperatures.

Next, the operation will be described. When the automobile is immersed in the puddle, the water-absorbing polymer member 6 absorbs water that has entered through the gap at the upper end of the cored bar 4 in FIG. 1, and the water-absorbing polymer member 6 swells as shown in FIG. Seal to prevent water from entering the bearing. When the vehicle runs out of the puddle and runs and the temperature rises, the water-absorbing polymer member 6 contracts and discharges water, and goes out as steam. Then, a gap 7 is generated by the contraction as shown in FIG.

FIGS. 3 and 4 show a second embodiment of the present invention.
The water-absorbing polymer member 6 is sandwiched and held between the flange 8a of the core bar 8 and the flange 9a of the core bar 9 integrally fixed to the core bar 8, and is covered with a stretchable permeable membrane 6a. .
The permeable membrane allows water to pass but not gel. Other structural actions are the same as those of the first embodiment.

[0008]

According to the present invention, since the water-absorbing polymer member is attached to one of the opposing surfaces of the two core bars on the outer side of the bearing of the seal portion, the water-absorbing polymer member absorbs and swells, and thus the automobile is manufactured. Water can be prevented from entering the bearing even if it enters the water pool, and the water-absorbing polymer member normally contracts to form a gap between the core and the core, thereby reducing rotational friction.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a first embodiment of the present invention when not in operation.

FIG. 2 is a front sectional view at the time of operation of FIG. 1;

FIG. 3 is a front sectional view of the second embodiment of the present invention when not in operation;

FIG. 4 is a front sectional view at the time of operation of FIG. 3;

FIG. 5 is a front sectional view of a conventional first comparative example.

FIG. 6 is a front sectional view of a conventional second comparative example.

[Explanation of symbols]

 Reference Signs List 1 outer ring 1a outer ring inner diameter surface 2 core metal 2a flange 3 inner ring 3a inner ring outer diameter surface 4 core metal 4a flange 5 seal lip 6 water absorbing polymer member 6a permeable membrane 7 gap

Claims (1)

(57) [Scope of request for utility model registration] A first metal core having a flange at an end of an inner ring surface of an outer ring, and a second metal core having a flange opposed to the flange of the core metal at an outer diameter end of an inner ring. And fix
A seal lip is provided on one of the metal cores to form a seal portion with the other metal core, and a water-absorbing polymer member is provided on one of the opposing surfaces of the metal cores on the outer side of the bearing from the seal portion. Mounting, the water-absorbing polymer swells due to water absorption
Sealing device of the rolling bearing, characterized in that as blocking the.