JP2003090443A - Sealing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealing device reducing internal stress of a seal lip part for controlling excessive wear. SOLUTION: Interference 2b1 of an outer circumference projection 2b in a side of object to be sealed A to a bearing outer ring 22 is greater than interference 2c1 of an outer circumference projection 2c in an opposite side of object to be sealed B to the bearing outer ring 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing device used as a rotary seal used in the field of general machines for wind power generators, for example.

[0002]

2. Description of the Related Art Conventionally, as a sealing device of this type, FIG.
There is something like. The sealing device 101 shown in FIG.
Is made of a rubber-like elastic body so that the sealing device 101 can be cut easily at one place on the circumference so as to be easily cut.

This sealing device 101 includes a fitting portion 102 fixed to a bearing outer ring 122, a main lip 103a extending from an axially opposite sealed side B of the fitting portion 102 and a bearing inner ring 121, and a dab. Strip 103b
And a seal lip portion 103 having

The main lip 10 of the seal lip portion 103
3a and the dust lip 103b are in close contact with the bearing inner ring 121 so that they can be slidably contacted to each other for sealing.
03a1 and 103b1 are provided.

The fitting portion 102 has an annular groove 102a which is separated from the bearing outer ring 122 at the center in the axial direction and two outer peripheral projections provided on both sides in the axial direction of the annular groove 102a so that the fitting portion 102 can be mounted and fixed to the bearing outer ring 122. 102b, 102c
And.

Here, the two outer peripheral projections 102b, 102
The sizes of c are substantially equal to each other, and the interferences 102b1 and 102c1 of the outer peripheral projections 102b and 102c with respect to the bearing outer ring 122 are also substantially equal.

[0007]

However, the interferences 102b1, 102c1, 103a1, 103b1 on the fitting portion 102 and the seal lip portion 103, respectively.
By providing the sealing device 10 as shown in FIG.
When the No. 1 is attached, there is a problem that the inner diameter becomes unstable, the internal stress of the main lip 103a and the dust lip 103b increases, and excessive wear occurs.

The present invention solves the above-mentioned problems of the prior art, and an object of the present invention is to provide a sealing device which reduces the internal stress of the seal lip portion and suppresses excessive wear. Especially.

[0009]

To achieve the above object, the present invention provides a sealing device for sealing an annular gap formed between two concentrically arranged members that rotate relative to each other. A fitting portion fixed to one of the two members; and a seal lip portion extending from the fitting portion to the side to be sealed in the axial direction and slidingly contacting the other member,
The fitting portion includes an annular groove that is separated from the one member at the center in the axial direction, and two protrusions that are provided on both sides in the axial direction of the annular groove. The interference of the protrusion with respect to the one member is larger than that of the protrusion on the non-sealing target side.

Therefore, the internal stress generated in the projection on the non-sealing target side is smaller than that of the projection on the sealing target side, and the internal stress of the projection on the sealing target side is directed toward the projection on the non-sealing target side by the annular groove. Since it is not transmitted to the seal lip portion, the influence of internal stress of the fit portion on the seal lip portion extending from the end portion of the anti seal side projection in the axial direction of the seal side end portion is reduced, Is less likely to change in dimension, the internal stress of the seal lip portion can be reduced, and excessive wear can be suppressed.

Both end surfaces in the axial direction of the fitting portion are in contact with the one member to sandwich the fitting portion in the one member, and at the base of the seal lip portion connected to the fitting portion. It is preferable that the end surface of the non-sealing target side also contacts the one member.

As a result, the end face of the non-sealing target side that contacts one member can be made large, so that even if the interference of the projection on the sealing target side of the fitting portion is large, it can be pressed and mounted with high accuracy and the device can be stabilized. It can be fixed with good sealing performance.

It is preferable that the seal lip portion includes a main lip extending toward the side to be sealed and a dust lip extending from the middle of the main lip to the side opposite to the side to be sealed.

Thus, the object to be sealed in the area to be sealed can be sealed by the main lip and the dust can be prevented from entering the area not to be sealed by the dust lip.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be illustratively described in detail below with reference to the drawings. However, the dimensions of the components described in this embodiment,
Unless otherwise specified, the material, the shape, the relative arrangement, and the like are not intended to limit the scope of the present invention thereto.

An embodiment will be described with reference to FIGS. FIG. 1 is a sectional view and a plan view showing a sealing device according to an embodiment. FIG. 2 is a half sectional view showing a mounted state of the sealing device.

The sealing device 1 shown in FIG. 1 is used as, for example, a rotating seal used in the field of general machines for wind power generators. Since the sealing device 1 is cut at one place on the circumference to be mounted, it can be easily cut.
It is made of rubber-like elastic material.

As shown in FIG. 2, the sealing device 1 includes a surface of a bearing inner ring 21 as two members which rotate relative to each other, and a surface of a bearing outer ring 22 which concentrically surrounds the bearing inner ring 21 and a surface of a bearing outer ring 22. Seal the annular gap of.

As shown in FIG. 1, the sealing device 1 includes a fitting portion 2 fixed to a bearing outer ring 22 and an axial anti-sealing target side B end portion of the fitting portion 2 which extends on a bearing inner ring 21. And a seal lip portion 3 in dynamic contact.

The fitting portion 2 has a bearing outer ring 2 at the center in the axial direction.
It has an annular groove 2a separated from 2, and two outer peripheral projections 2b and 2c provided on both sides in the axial direction of the annular groove 2a.

As a feature of the present invention, of the two outer peripheral projections 2b, 2c, the outer peripheral projection 2b on the sealing target side A is provided larger than the outer peripheral projection 2c on the non-sealing target side B, and the outer peripheral projection on the sealing target side A is provided. 2b1 of the bearing outer ring 22 of 2b is made large, and the outer peripheral projection 2 on the side B opposite to the sealing target
The interference 2c1 of c with respect to the bearing outer ring 22 is made small. That is, the interference 2b1 of the outer peripheral projection 2b on the sealing target side A with respect to the bearing outer ring 22 is made larger than the interference 2c1 of the outer peripheral projection 2c on the non-sealing target side B with respect to the bearing outer ring 22.

On the other hand, the seal lip portion 3 has a fitting portion 2
The main lip 3a extending from the end of the axial anti-sealing target side B toward the sealing target side A while reducing the diameter in the inner diameter direction, and the main lip 3a extending from the middle of the main lip 3a toward the anti-sealing target side B while reducing the inner diameter direction. And a strip 3b.

The main lip 3a and the dust lip 3b are provided with interference fits 3a1 and 3b for the bearing inner ring 21.
1 is provided as in the conventional case.

As a result, the object to be sealed in the area A to be sealed is sealed by the main lip 3a and the side B to be sealed is not sealed.
The dust lip 3b can prevent dust from entering the area.

The mounting state of the sealing device 1 having the above structure will be described with reference to FIG.

In the sealing device 1, the fitting portion 2 has the bearing outer ring 2
It is attached and fixed to 2. Here, in the bearing outer ring 22 to which the fitting portion 2 is mounted and fixed, a stepped wall surface 22a in the inner diameter direction is formed on the sealing target side A, and the non-sealing target side B is formed.
Further, it has a pressing member 23 for pressing the sealing device 1. The pressing member 23 is fixed to the bearing outer ring 22 with a bolt 24.

Therefore, in the sealing device 1, both axial end surfaces of the fitting portion 2 come into contact with the step wall surface 22a and the pressing member 23, so that the fitting portion 2 is moved along the step wall surface 22a and the pressing member 23.
It can be said that it is sandwiched between and fixed.

Further, in the sealing device 1, as described above, since the outer peripheral projection 2b on the sealing target side A of the fitting portion 2 is large and the interference 2b1 is also large, the sealing target side A of the fitting portion 2 is large.
Needs to be strongly pressed.

For this reason, the end surface B of the non-sealing target side at the base of the seal lip portion 3 connected to the fitting portion 2 is also in contact with the pressing member 23, and is in contact with the bearing outer ring 22 of the sealing device 1. Since the end surface of the side B to be sealed can be made large, even if the interference 2b1 of the outer peripheral protrusion 2b of the side A to be sealed of the fitting portion 2 is large, it can be pressed and mounted with high accuracy, and the sealing device 1 is stably and firmly fixed can do.

In the sealing device 1 described above, the internal stress generated in the outer peripheral projection 2c of the non-sealing target side B of the fitting portion 2 becomes smaller than that of the outer peripheral projection 2b of the sealing target side A, and the sealing target side. Since the internal stress of the outer peripheral projection 2b of A is not transmitted to the outer peripheral projection 2c of the non-sealing target side B by the annular groove 2a, the axial direction reverse of the fitting portion 2 having the outer peripheral projection 2c of the non-sealing target side B is performed. The influence of the internal stress of the fitting portion 2 on the seal lip portion 3 extending from the end of the side B to be sealed is reduced, the dimension of the seal lip portion 3 is less likely to change, and the instability of the inner diameter dimension is prevented. Lip 3
It is possible to reduce the internal stress of a and the dust lip 3b and suppress the occurrence of excessive wear.

Further, since only the interference 2b1 of the outer peripheral projection 2b on the sealing target side A of the fitting portion 2 is large, the sealing device 1 is pushed into the sealing target side A when the sealing device 1 is mounted on the bearing outer ring 22. , It can be easily pushed in and the assemblability is improved.

Further, by fitting and fixing the fitting portion 2 described above, the fitting force can be increased, the sealing performance can be improved, and the sealing device 1 is less likely to rotate together.

The sealing device 1 may have a reinforcing ring made of, for example, metal or resin, in addition to the structure of the above-described embodiment. FIG. 3 is an example of a sealing device having a reinforcing ring. FIG. 3A shows a reinforcing ring (reinforcing ring) which is split into one part on the outer peripheral projection 2b on the side A to be sealed of the fitting portion 2.
3 is an example in which the one-piece split ring 4 is arranged on the outer peripheral projection 2c of the mating portion 2 on the side B opposite to the sealing target.

[0034]

As described above, according to the present invention, the interference of the projection on the sealing target side of the two projections with respect to the one member is made larger than that of the projection on the anti-sealing target side. Since the internal stress generated in the projection on the target side is smaller than that of the projection on the sealing target side, and the internal stress of the projection on the sealing target side is not transmitted to the projection on the anti-sealing target side by the annular groove, The influence of the internal stress of the mating part on the seal lip part extending from the end part on the anti-sealing target side in the axial direction of the mating part with the projection on the anti-sealing target side is reduced, and the dimension of the seal lip part is less likely to change. It is possible to reduce the internal stress of the seal lip portion and prevent excessive wear from occurring.

Both axial end faces of the fitting portion are in contact with one member so that the fitting portion is sandwiched by the one member. By touching one member,
Since the end face of the non-sealing target that contacts one of the members can be made large, even if the interference of the protrusion on the sealing target side of the fitting part is large, it can be pressed and mounted with high accuracy and the device can be fixed stably and with good sealing performance. be able to.

The seal lip portion is provided with the main lip extending toward the side to be sealed and the dust lip extending from the middle of the main lip to the side opposite to the side to be sealed. In addition, dust can be prevented from entering the anti-sealing target side region with the dust lip.

[Brief description of drawings]

FIG. 1 is a diagram showing a sealing device according to an embodiment.

FIG. 2 is a half cross-sectional view showing a mounted state of the sealing device according to the embodiment.

FIG. 3 is a half sectional view showing a sealing device having a reinforcing ring according to the embodiment.

FIG. 4 shows a prior art sealing device.

FIG. 5 is a half sectional view showing a mounted state of a conventional sealing device.

[Explanation of symbols]

1 Sealing device 2 Fitting part 2a annular groove 2b, 2c peripheral protrusion 2b1, 2c1 interference 3 Seal lip 3a Main lip 3b dust lip

Claims (3)

[Claims] 1. A sealing device for sealing an annular gap formed between two concentrically arranged members that rotate relative to each other, the fitting unit being fixed to one of the two members, and the fitting unit. A seal lip portion extending from the mating portion to the side to be sealed in the axial direction and slidingly contacting the other member, wherein the mating portion is an annular groove separated from the one member at the center in the axial direction, Two protrusions provided on both sides in the axial direction of the annular groove are provided, and the interference of the protrusion on the sealing target side of the two protrusions with respect to the one member is made larger than that of the protrusion on the non-sealing target side. A sealing device characterized by the above. 2. The both axial end surfaces of the fitting portion are in contact with the one member to sandwich the fitting portion in the one member, and the seal lip portion of the seal lip portion connected to the fitting portion. The sealing device according to claim 1, wherein an end surface of the root opposite to the sealing target side also contacts the one member. 3. The seal lip portion includes a main lip extending toward the side to be sealed, and a dust lip extending from the middle of the main lip to the side opposite to the side to be sealed. The sealing device described.