JP2000081150A - Seal device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the slidability of a lip sliding part and to prevent the early wear and reduction in sealing property of the lip tip part by forming a circumferential groove on a radial lip sliding part on the outside surface of the cylindrical part of a slinger, and fitting the tip of the radial lip into the circumferential groove. SOLUTION: In the structure of the sliding part of a first radial lip 6b which is a main lip with the cylindrical part of a slinger 2, a circumferential groove 9 is formed on the outside surface of the cylindrical part 2a of the slinger 2, and the tip 11 of the first radial lip 6b is fitted to the circumferential groove 9. The tip 12 of a second radial lip 6c, which is an auxiliary lip, is also fitted to a circumferential groove 10 (which may be omitted as occasion demands) formed on the outside surface of the cylindrical part 2a of the slinger 2. The fitting of the tip 11 of the first radial lip 6b to the circumferential groove 9 is performed so that both shoulder parts of the circumferential groove 9 make contact with both inclined surfaces of the tip 11. According to this fitting state, grease can be held between the lip and the circumferential groove to improve the lubricating property.

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 used for, for example, an automobile wheel bearing.

[0002]

2. Description of the Related Art Conventionally, as this type of bearing sealing device, there is one having a structure shown in FIG. 6 (Japanese Utility Model Laid-Open No. 7-34260). This sealing device includes an outer member A such as an outer ring,
The two members A, which are fitted between inner members B such as a shaft and an inner ring,
A seal member 1 for sealing the space between B and a slinger 2 fitted and fixed to the inner member B is provided.

The seal member 1 is composed of a core 4 and an elastic body 6 fixed to the core 4 by baking synthetic rubber or the like. Shape part 4
and an annular portion 4 extending radially inward from the cylindrical portion 4a
b. The slinger 2 is composed of a cylindrical portion 2a fitted to the inside member B and an annular portion 2b extending radially outward from the cylindrical portion 2a.

The elastic body 6 includes a base 6a fixed along the annular portion 4b from the inner peripheral surface side of the cylindrical portion 4a of the cored bar 4, and a main lip extending radially inward from the base 6a. A first radial lip 6b having a substantially triangular cross section and a second radial lip 6c serving as an auxiliary lip are formed, and an axial lip 6d is formed obliquely outward in the axial direction. Then, in a state where the slinger 2 is fitted and fixed to the inner member B, the tips of the first and second radial lips 6b and 6c abut on the cylindrical portion 2a, and the tips of the axial lip 6d abut on the annular portion 2b. To form a sealed part. In addition, although the tip of the axial lip 6d is in contact with the annular portion 2b, it may be a non-contact sealing portion having a slight gap in some cases. Further, the second radial lip 6c as the auxiliary lip may be omitted as necessary.

Further, a space 7 between the first radial lip 6b and the second radial lip 6c and a space 8 between the first radial lip 6b and the axial lip 6d are provided with sliding portions of the lips 6b, 6c and 6d. Grease is sealed for lubrication.

[0006]

By the way, in the above sealing device, the grease sealed in the spaces 7, 8 flows out of the space during use to cause poor lubrication in the sliding portions of the lips 6b, 6c, 6d. May occur. In this case, the first radial lip 6b, which is a main lip having a particularly strong tension, may be quickly worn away, which may cause a problem of deterioration in sealing performance. Further, variations in the positioning of the slinger 2 in the axial direction (the positions indicated by the dotted lines in FIG. 6) appear as variations or deformations in the contact pressure of the axial lip 6d, and as a result, the sealing performance is likely to be affected. It requires sufficient management and is cumbersome.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a sealing device which improves lubrication of a sliding portion of a radial lip and facilitates positioning of a slinger in an axial direction.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a sealing member mounted on an outer member,
A slinger fitted and fixed to the inner member, wherein the seal member has an elastic body fixed to a cored bar, and the slinger has a tubular portion fitted to the inner member and a radially outer portion from the tubular portion. A ring portion extending from the base to be fixed to the metal core, and a sealing portion between the radial lip forming the sealing portion by contacting the cylindrical portion of the slinger and the ring portion of the slinger. In the sealing device in which the axial lip forming is integrally extended, a circumferential groove is formed in a radial lip sliding portion on the outer peripheral surface of the cylindrical portion of the slinger, and a tip of the radial lip is formed in the circumferential groove. It is characterized by being fitted.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. In order to avoid redundant description, the same components will be described using the same reference numerals as those used in the illustrations of the related art. In FIG. 1, reference symbol A denotes an outer member such as an outer ring of the bearing, and B denotes an inner member such as an inner ring of the bearing. Reference numeral 1 denotes a seal member attached to the outer member A, 2 denotes a slinger, 2a and 2b denote a cylindrical portion and an annular portion that constitute a slinger, 4 denotes a core that constitutes the seal member 1, and 4a and 4b denote a core. The cylindrical portion and the annular portion 4 are elastic members fixed to the core 4 by baking synthetic rubber or the like. The elastic body 6 extends along the annular portion 4b from the inner peripheral surface side of the cylindrical portion 4a of the cored bar 4.
Is a base 6a fixed along the annular portion 4b from the inner peripheral surface side of the cylindrical portion 4a of the metal core 4, and a main lip extending radially inward from the base 6a and having a substantially triangular cross section. One radial lip 6b and a second radial lip 6c as an auxiliary lip are formed, and an axial lip 6d is formed diagonally outward in the axial direction. Then, in a state where the slinger 2 is fitted and fixed to the inner member B, the tips of the first and second radial lips 6b and 6c abut on the cylindrical portion 2a, and the tips of the axial lip 6d abut on the annular portion 2b. To form a sealed part. The space 7 between the first radial lip 6b and the second radial lip 6c,
Space 8 between radial lip 6b and axial lip 6d
Is filled with grease for lubricating each lip sliding portion. These configurations described above are the same as in the conventional example.

The feature of the present invention lies in the structure of the sliding portion between the first radial lip 6b as the main lip and the cylindrical portion 2a of the slinger 2.

That is, the configuration of the sliding portion between the first radial lip 6b, which is the main lip, and the cylindrical portion 2a of the slinger 2 can be understood from the slinger shown in FIG. A peripheral groove 9 is formed on the outer peripheral surface of the cylindrical portion 2a of the first radial lip 6b.
1 is inserted. In FIG. 2, the tip 12 of the second radial lip 6c, which is an auxiliary lip, is also fitted in the circumferential groove 10 formed on the outer peripheral surface of the cylindrical portion 2a of the slinger 2. May be omitted. Next, the fitted state of the peripheral groove 9 and the distal end portion 11 of the first radial lip 6b has a form as shown in FIG. 3 or FIG. That is, in the embodiment of FIG. 3, the lip tip 11 is fitted into the circumferential groove 10 such that the shoulders 9a, 9b of the circumferential groove 9 contact the slopes 11a, 11b of the lip tip 11. . In this fitted state, since there are two sealing surfaces, the maximum sliding pressure can be reduced by half and the wear resistance is improved. Since grease can be held between the lip 11 and the circumferential groove 9, lubricity is improved. Even if the tip of the lip 11 is damaged in the axial direction when the seal member is mounted, the two sealing surfaces prevent grease leakage. This is an advantage. Further, in the embodiment of FIG. 4, the width of the peripheral groove 9 is increased, and the lip tip 11 is slid only at the bottom 9c. In this fitted state, grease easily enters the circumferential groove,
It is an advantage that lubricity is improved.

FIG. 5 shows another embodiment, in which a plurality of the circumferential grooves 9 are provided, and a plurality of ridges to be fitted into the plurality of the circumferential grooves 9 are provided on the distal end portion 11 of the first radial lip 6b. Since this is the fitting shape, since there are a plurality of sealing surfaces, the maximum sliding force can be further reduced as compared with the case of FIG. 3, and the effect of improving the wear resistance can be obtained.

[0013]

As described in detail above, since the grease is held in the circumferential groove serving as the lip sliding portion, the lubricating property of the lip sliding portion is improved, premature wear of the lip tip portion is prevented, and sealing is performed. Is prevented from lowering. Further, since the slinger is positioned in the axial direction by fitting the tip of the lip into the peripheral groove of the slinger, the slinger can be easily incorporated.

[Brief description of the drawings]

FIG. 1 is a sectional view of a sealing device of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a first lip fitting state diagram of the present invention.

FIG. 4 is a second lip fitting state diagram of the present invention.

FIG. 5 is a third lip fitting state diagram of the present invention.

FIG. 6 is a sectional view of a conventional sealing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Seal member 2 Slinger 2a Cylindrical part 2b Annular part 4 Core 4a Cylindrical part 4b Annular part 6 Elastic body 6a Base 6b First radial lip 6c Second radial lip 6d Axial lip 9 Peripheral groove

Claims (1)

[Claims] 1. A seal member attached to an outer member, and a slinger fitted and fixed to the inner member, wherein the seal member is formed by fixing an elastic body to a core bar, and the slinger is fitted to the inner member. The elastic body has a cylindrical portion to be fitted and an annular portion extending radially outward from the cylindrical portion, and the elastic body contacts a cylindrical portion of the slinger from a base fixed to the core bar to form a sealing portion. In a sealing device in which an axial lip forming a sealing portion extends integrally between a radial lip to be formed and an annular portion of a slinger, a circumferential groove is formed in a radial lip sliding portion on an outer peripheral surface of a cylindrical portion of the slinger. A sealing device formed, wherein a distal end of the radial lip is fitted into the circumferential groove.