JP2001280510A - Sealing structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealing structure with improved sound insulation performance. SOLUTION: In this structure, a housing 3 comprises about two members, i.e., a cover member 31 and a case member 33, and the cover members 31 and the case member 33 are fixed through a prescribed gap such that the wall of the housing 3 is a multilayer wall. Namely, the cylindrical wall face of the housing 3 is a three-layer wall comprising an outer layer composed of the cover member 31, an inner layer composed of the case member 33, and a middle layer 32 composed of the gap between the cover member 31 and the case member 33 functioning as a sound insulation layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing structure for a shaft sealing portion provided in various devices such as automobiles and home electric appliances.

[0002]

2. Description of the Related Art Conventionally, this kind of sealing structure has been applied to a shaft sealing portion provided in various devices, for example, a dust sealing portion of a steering column of an automobile.

With reference to FIG. 3, a sealing structure according to the prior art will be described. FIG. 3 is a schematic configuration diagram of a sealing structure according to the related art.

As shown in FIG. 3, a conventional sealing structure generally includes a shaft member 101, a housing 102 having a shaft hole through which the shaft member 101 is inserted, and provided on the shaft member 101 and the housing 102. And a sealing member 103 for sealing an annular gap between the shaft hole and the shaft hole.

Thus, for example, when used in a dust seal portion of a steering column of an automobile, the interior side R and the exterior side O are shut off to prevent dust from entering the interior side R from the exterior side O. Preventing.

Here, a rubber material is usually used as a material of the housing 102. In the illustrated example, the housing 102 has two layers, an outer layer 102A and an inner layer 102B.
Although it has a double structure consisting of layers, there is also a single structure having only one layer.

[0007] An outer peripheral seal 103a is fitted and fixed to the inner peripheral side of the housing 102 to seal.
Inner seal 103b slidingly contacting the outer periphery of shaft member 101
And a bellows part 10 for connecting these and following the large eccentricity of the shaft member 101 to maintain the sealing performance.
3c.

The metal ring 1 is provided inside the outer peripheral seal 103a.
A sealing member is formed by baking and molding a rubber material on the metal ring 103d, and the rigidity of the metal ring 103d causes an inner peripheral side of the housing 102 to be formed. It is fitted and fixed.

Further, in order to sufficiently fix the housing 102 and the sealing member 103, both of which are made of rubber, clamping is usually performed, for example, with a metal band 104 as shown in FIG. .

[0010]

However, in the case of the above-mentioned prior art, the sealing performance against the intrusion of dust and the like is good, but the sound insulating performance is not sufficient.

That is, in the prior art, the sound insulation effect of the housing 102 depends on the material, thickness and the like of the housing 102 itself, and there is a limit in enhancing the sound insulation effect.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a sealing structure with improved sound insulation performance.

[0013]

In order to achieve the above object, according to the present invention, a shaft member, a housing having a shaft hole through which the shaft member is inserted, and a housing between the shaft member and the shaft hole are provided. And a sealing member for sealing the annular gap, wherein the housing includes a multi-layer wall having a sound insulating layer.

Therefore, the sound insulation performance of the housing is improved.

The sound insulation layer is preferably an air layer.

Thus, the sound insulation is improved without using a special material.

[0017]

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the dimensions of the components described in this embodiment,
The materials, shapes, relative arrangements, and the like are not intended to limit the scope of the present invention only to them unless otherwise specified.

(First Embodiment) Referring to FIG. 1, a sealing structure according to a first embodiment of the present invention will be described. 1A and 1B are schematic configuration diagrams of a sealing structure according to a first embodiment of the present invention, wherein FIG. 1A shows the entire structure, and FIG. 1B is an enlarged view of a portion A surrounded by a dotted line in FIG. Is shown.

The sealing structure 1 according to the embodiment of the present invention comprises:
In general, a shaft member 2, a housing 3 having a shaft hole through which the shaft member 2 is inserted, and a sealing member 4 for sealing an annular gap between the shaft member 2 and a shaft hole provided in the housing 3.
And is composed of For the sake of simplicity, only the surface of the shaft member 2 when virtually mounted is indicated by a dashed line.

Thus, for example, when used in a dust seal portion of a steering column of an automobile, the interior side R and the exterior side O are shut off to prevent dust from entering the interior side R from the exterior side O. Preventing.

In this embodiment, the sealing member 4 is composed of two members, a first sealing member 4A and a second sealing member 4B.

The first sealing member 4A has an inner peripheral seal 41A slidably in contact with the outer periphery of the shaft member 2 and a reinforcing ring (metal ring) inside. And a bellows portion 43A for connecting these and following the large eccentricity of the shaft member 2 to maintain the sealing performance.

On the other hand, the second sealing member 4B has an inner peripheral seal 41B slidably in contact with the outer periphery of the shaft member 2 and a reinforcing ring (metal ring) inside, and has an inner peripheral seal 42A of the first sealing member 4A. An outer peripheral seal 42B which is fitted and fixed to the side and seals;
A bellows portion 43B is provided for connecting these components and keeping the sealing performance by following the large eccentricity of the shaft member 2.

As described above, by forming the sealing member 4 from two members, it is possible to exhibit sufficient sealing performance against intrusion of dust and the like.

The housing 3 is roughly composed of two members, a cover member 31 and a case member 33.
The cylindrical portion has a structure having a predetermined gap between them, so that the wall of the housing 3 in this portion is a multi-layer wall.

That is, in the wall of the cylindrical portion of the housing 3, the cover member 31 forms an outer layer, the case member 33 forms an inner layer, and a gap between the cover member 31 and the case member 33 functions as a sound insulation layer. The intermediate layer 32 has a three-layer wall.

As described above, by forming the two members, the cover member 31 and the case member 33, into a structure having a gap in the cylindrical portion, an air layer can be easily formed,
This air layer can be configured as an intermediate layer 32 functioning as a sound insulation layer.

Here, the cover member 31 and the case member 33
In order to form and secure an air space with the two members of
These two members are preferably made of a material having high rigidity to some extent, for example, metal or resin.

As described above, by providing the housing 3 with a multi-layer wall, the sound insulation performance between the inside and the outside can be improved. For example, when it is used for a dust seal portion of a steering column of an automobile, it is possible to reduce the noise of the outside O (especially the sound of an engine) from entering the inside R.

As described above, the sealing structure according to the present embodiment can prevent intrusion of dust and the like, and can reduce intrusion of noise, that is, improve the sound insulation effect.

In the illustrated example shown in the present embodiment, the sealing member 4 is also composed of two members, and an air layer is formed between these members. The sound insulation in parts is also excellent.

(Second Embodiment) FIG. 2 shows a second embodiment of the present invention. In the first embodiment, the case where the sealing member is constituted by two members has been described. However, in this embodiment, the sealing member is constituted by only one member, and the intrusion of noise from the sealing member is reduced. For this reason, the configuration in the case where a sound insulating material is provided is shown.

Referring to FIG. 2, a sealing structure according to a second embodiment of the present invention will be described. FIG. 2 is a schematic configuration diagram of a sealing structure according to a second embodiment of the present invention,
(A) shows the whole thereof, and (b) shows an enlarged view of a portion B surrounded by a dotted line in (a).

The sealing structure 5 according to the embodiment of the present invention comprises:
Generally, a shaft member 6, a housing 7 having a shaft hole through which the shaft member 6 is inserted, and a sealing member 8 for sealing an annular gap between the shaft member 6 and a shaft hole provided in the housing 7.
And is composed of For the sake of simplicity, only the surface of the shaft member 6 when it is virtually mounted is shown by a dashed line.

Thus, as in the case of the first embodiment described above, for example, when used in a dust seal portion of a steering column of an automobile, the indoor side R and the outdoor side O are shut off. This prevents dust from entering the indoor side R from the outdoor side O.

In this embodiment, unlike the first embodiment, the sealing member 8 is composed of only one member, and the inner peripheral seal is in sliding contact with the outer periphery of the shaft member 6. 81 and an outer peripheral seal 82 which has a reinforcing ring (metallic ring) inside and is fitted and fixed to the inner peripheral side of the housing 7 to seal.
And a bellows part 83 for connecting these and following the large eccentricity of the shaft member 6 to maintain the sealing performance.
It has.

An annular sound insulating material 9 is provided adjacent to the sealing member 8. The outer peripheral side of the sound insulating material 9 is fitted and fixed to the inner peripheral side of the housing 7, and the inner peripheral side is set to have a predetermined gap with respect to the shaft member 6.
The predetermined gap may be provided in consideration of the amount of eccentricity of the shaft member 6 and sound insulation.

The housing 7 includes a cover member 71 and a case member 7 similar to the first embodiment.
In the wall of the cylindrical portion of the housing 7, the cover member 71 forms an outer layer, the case member 73 forms an inner layer, and a gap between the cover member 71 and the case member 73. Layer 72 functioning as a sound insulation layer
And a three-layer wall.

Since the effect of the structure in which the wall of the housing 7 is formed as a multi-layer wall is the same as that of the first embodiment, detailed description thereof is omitted.

In the illustrated example shown in the present embodiment, although the sealing member 7 is constituted by only one member, the sound insulating member 9 is provided, so that the sealing member 7 is provided in the same manner as in the first embodiment. Also, the sound insulation at the sealing member 7 is excellent.

In each of the first and second embodiments described above, the case where the air layer is used as the sound insulating layer has been described. However, the sound insulating function is not limited to the air layer. It is also possible to apply a material having, for example, a foamable rubber material. Further, when a material having low rigidity is used as the material of the case member or the cover member, cotton or the like may be packed in the intermediate layer in order to maintain an air layer.

Further, in the example shown so far, the case where the wall of the housing has a three-layer structure has been described as an example.
The layer is not limited to the weight, and may be a higher layer. For example, the air layer (sound insulation layer) and the rigid member may be stacked in multiple stages. As the number of the sound insulation layers is increased, the sound insulation performance can be further improved.

[0043]

As described above, according to the present invention, since the housing is provided with the multi-layer wall having the sound insulating layer, the sound insulating performance is improved.

When the sound insulation layer is an air layer, the sound insulation can be improved with a simple structure.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a sealing structure according to a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a sealing structure according to a second embodiment of the present invention.

FIG. 3 is a schematic configuration diagram of a sealing structure according to the related art.

[Explanation of symbols]

 1,5 Sealing structure 2,6 Shaft member 3,7 Housing 31,71 Cover member 32,72 Intermediate layer 33,73 Case member 4,8 Sealing member 4A First sealing member 41A Inner circumference seal 42A Outer circumference seal 43A Bellows part 4B Second sealing member 41B Inner peripheral seal 42B Outer peripheral seal 43B Bellows 81 Inner peripheral seal 82 Outer peripheral seal 83 Bellows 9 Sound insulation material

Claims (2)

[Claims] 1. A sealing structure comprising: a shaft member; a housing having a shaft hole through which the shaft member is inserted; and a sealing member for sealing an annular gap between the shaft member and the shaft hole. The housing has a multi-layer wall having a sound insulation layer. 2. The sealing structure according to claim 1, wherein said sound insulation layer is an air layer.