JPH07127650A - Sealing device of bearing - Google Patents

Abstract

PURPOSE:To improve sealing property in the case of outer ring rotating bearing, and further prevent leakage of grease. CONSTITUTION:A seal ring 4 is fitted onto the inner diameter face of the end part of an outer ring. A core metal 7 having a cylindrical part 8 and a flange 9 is fitted onto the outer diameter face of the end part of an inner ring 2, and a labyrinth 10 is provided between the core metal 7 and the inner end part of the outside of the seal ring 4. An elastic seal 11 fixedly secured to the core metal 7 is provided with a first radial lip 12 and a second radial lip 13 slidably contacted with the inner diameter face of the cylindrical part 5 of the seal ring 4, and a side lip 14 slidably contacted with the inside face of the flange 6 of the seal ring 4. The side lip 14 is inclined in the inner diameter direction, and by the labyrinth 10 and contact of the side lip 14 with the inside face of the seal ring 4, invasion of muddy water or dust into the bearing is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing sealing device, and more particularly to a rolling bearing sealing device for automobiles.

[0002]

2. Description of the Related Art Rolling bearings used for automobile wheels are exposed to the outside. Therefore, the inner and outer rings of the bearing are sealed to prevent foreign matter such as muddy water and dust from entering the bearing, and It is necessary to prevent leakage of the enclosed grease or other lubricant to the outside.

Conventionally, as a sealing device for a rolling bearing for a wheel of an automobile or the like, a device described in JP-A-62-283261 is known.

As shown in FIG. 2, the above-mentioned sealing device is provided with a labyrinth 22 on an outer peripheral portion of a first sealing element 20 and a second sealing element 21 having an L-shaped cross section, and an inner diameter side end portion of the first sealing element 20. A first radial lip 24 and a second radial lip 25 that are in sliding contact with the outer diameter surface of the second sealing element 21 and a side lip 26 that is in sliding contact with the inner surface of the second sealing element 21 are provided on the elastic seal 23 that is fixedly attached to the second sealing element 21. .

In the above sealing device, the first sealing element 20 is attached to the inner diameter surface of the end of the bearing outer ring, the second sealing element 21 is attached to the outer diameter surface of the end of the bearing inner ring, and the labyrinth 22 and the second sealing element 21 are attached. Sliding contact between the second radial lip 25 and the side lip 26 prevents muddy water and dust from entering the inside of the bearing, and sliding contact between the first radial lip 24 and the second sealing element 21 causes external leakage of lubricant inside the bearing. Is being prevented.

[0006]

In the above sealing device, the second radial lip 25 is inclined inward toward the outside of the bearing, and the side lip 26 is inclined outward in the radial direction. When the bearing is an outer ring rotating, the centrifugal force acting on the second radial lip 25 and the side lip 26 weakens the interference, and there is a problem that it is not possible to exhibit a stable sealing property for preventing the entry of muddy water and dust.

An object of the present invention is to provide a sealing device which exhibits a stable sealing property especially when the outer ring rotates.

[0008]

In order to solve the above-mentioned problems, according to the present invention, in a bearing sealing device in which a rolling element is incorporated between an outer ring and an inner ring, the end inner diameter surface of the outer ring is fitted. The seal ring is provided with a flange inward from the outer end of the attached cylindrical portion, and the flange is formed outward from the inner end of the cylindrical portion fitted to the outer diameter surface of the end of the inner ring. A core bar, and an elastic seal fixed to the core bar and having a pair of radial lips that slidably contact the inner diameter surface of the cylindrical portion of the seal ring and a side lip that slidably contacts the inner surface of the flange. A labyrinth is formed between the inner diameter edge and the outer end of the cylindrical portion of the core metal, and the side lip is inclined in the inner diameter direction.

[0009]

[Function] As described above, the seal ring is fitted to the outer ring,
Since the side lip slidably contacting the inner surface of the flange of the seal ring is inclined in the inner diameter direction, when the outer ring rotates, the interference of the side lip does not change and stable sealing performance is exhibited.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

As shown, the bearing comprises an outer ring 1, an inner ring 2 and a rolling element 3. A seal ring 4 is attached to the end of the outer ring 1.

The seal ring 4 is provided with a flange 6 inwardly from the outer end of a cylindrical portion 5 fitted to the inner diameter surface of the end of the outer ring 1.
Is provided.

A cored bar 7 is attached to the end of the inner ring 2. The cored bar 7 has a structure in which a flange 9 is provided outward from an inner end of a cylindrical portion 8 fitted to the outer diameter surface of the end of the inner ring 2, and the outer end of the cylindrical portion 8 is provided. A labyrinth 10 is formed between the inner edge of the flange 6 of the seal ring 4.

An elastic seal 11 is fixed to the cored bar 7. The elastic seal 11 is provided with a first radial lip 12 and a second radial lip 13 that are in sliding contact with the inner diameter surface of the cylindrical portion 5 of the seal ring 4, and a side lip 14 that is in sliding contact with the inner surface of the flange 6 of the seal ring 4. ing.

The first radial lip 12 is inclined toward the inside of the bearing to prevent external leakage of a lubricant such as grease enclosed in the bearing.

On the other hand, the second radial lip 13 is inclined toward the outside of the bearing, and the side lip 14 is inclined toward the inner diameter direction of the bearing.

As described above, the seal ring 4 is formed by inclining the second radial lip 13 toward the outside of the bearing and inclining the side lip 14 toward the inner diameter.
Sliding contact of the above-mentioned respective lips 13, 14 with respect to the labyrinth 1
With 0, it is possible to prevent muddy water and dust from entering the inside of the bearing.

Since the seal ring 4 is attached to the outer ring 1 and the elastic seal 11 is fixed when the bearing is rotating the outer ring, the first radial lip 12, the second radial lip 13 and the side lip 14 are tightened. Does not change and always exhibits stable sealing performance.

Further, when the bearing rotates in the inner ring, the first radial lip 12, the second radial lip 13 and the side lip 14 come into strong contact with the seal ring 4 due to the centrifugal force, and muddy water inside the bearing and Prevents intrusion of dust and leakage of lubricant more reliably.

[0020]

Since the present invention is configured as described above, it has the following effects.

The labyrinth formed at the outer ends of the seal ring and the core metal, the second radial lip that slidably contacts the inner surface of the seal ring, and the side lip that is inclined in the inner diameter prevent muddy water and dust from entering the bearing. It is possible to prevent the grease from leaking to the outside by the first radial lip.

When the bearing is rotated by the outer ring, the seal siro of the first and second radial lips and the side lips do not change, and stable sealing performance can be exhibited.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a sealing device according to the present invention.

FIG. 2 is a sectional view showing a conventional sealing device.

[Explanation of symbols]

 1 Outer ring 2 Inner ring 3 Rolling element 4 Seal ring 5 Cylindrical part 6 Flange 7 Core metal 8 Cylindrical part 9 Flange 10 Labyrinth 11 Elastic seal 12 1st radial lip 13 2nd radial lip 14 Side lip

Claims (1)

[Claims] 1. A bearing sealing device having rolling elements incorporated between an outer ring and an inner ring, wherein a flange is provided inward from an outer end of a cylindrical portion fitted to an inner diameter surface of an end of the outer ring. A seal ring, a core metal having a flange formed outward from the inner end of the cylindrical portion fitted to the outer diameter surface of the end of the inner ring, and a cylindrical portion of the seal ring fixed to the core metal. An elastic seal having a pair of radial lips that slidably contact the inner diameter surface and a side lip that slidably contacts the inner surface of the flange, and a labyrinth is formed between the flange inner diameter edge of the seal ring and the outer end of the cylindrical portion of the core metal. And a sealing device for the bearing, wherein the side lip is inclined in the inner diameter direction.