JP2001012613A - Hermetically sealed device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the hermetically sealing performance and quality by giving a magnetism to the outer periphery seal mounted on a housing inner periphery. SOLUTION: By using a magnetic material for the raw material of an outer periphery seal, a magnetic attraction force is generated between the outer periphery seal and annular groove 91 wall surface. It is favorable to use the member such as an iron material and magnet by which the magnetic attractive force is generated between the annular groove 91 wall surface and magnetic material. As the magnetic attractive force is generated between the outer periphery seal and annular groove 91 wall surface, the fixing force against the housing 90 of a hermetically sealed device is increased and the generation possibility of the turning together with the shaft 80 of the hermetically sealed device is reduced and thereby, the possibility of the sliding between the outer periphery lips 2a, 2b and annular groove 91 wall surface is reduced. Therefore, the wear of the outer periphery lips 2a, 2b can be restrained and the adhesiveness to the annular groove 91 wall surface can be improved by combined with the magnetic attraction force.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing device for preventing leakage of a fluid or the like.

[0002]

2. Description of the Related Art Conventionally, as this type of sealing device, for example, the one shown in FIGS. 7 and 8 is known.

FIG. 7 and FIG. 8 are schematic structural views showing a state of use of a conventional sealing device.

[0004] First, a sealing device 100 shown in FIG.
And an annular gap between the shaft 80 inserted in the shaft hole provided in the housing 90.

[0005] As shown in FIG.
Is an annular groove 9 provided in the housing 90 and having a U-shaped cross section.
1 and used.

The sealing device 100 has an outer peripheral lip 1 on the outer peripheral side.
02a, 102b, and an inner peripheral lip 1 on the inner peripheral side.
03a, 103b, and outer lip 102a,
102b is sealed by closely contacting the wall surface of the annular groove 91,
In addition, the inner peripheral lips 103a and 103b are slidably contacted with the shaft 80 to seal, so that the sealing fluid (oil or the like) side O and the atmosphere side A are shut off and sealed.

Next, a sealing device 110 shown in FIG. 8 is a housing 9 which is mounted concentrically and relatively rotatably.
5 to seal the annular gap between the shaft 85 inserted into the housing 95 and shut off the sealed fluid (oil or the like) side O and the atmosphere side A to prevent fluid leakage and the like. It is to prevent.

The sealing device 110 includes a reinforcing ring 150 having a substantially L-shaped cross section, an outer peripheral seal 120 fitted on the inner periphery of the housing 95, and a seal lip slidably sealingly contacting the outer peripheral surface of the shaft 85. 130.

The seal lip 130 has a main lip 131 mainly for preventing leakage of the sealing fluid,
And a dust lip 132 mainly for preventing dust from entering from the outside.

Further, a spring 140 for applying a tightening force to the outer peripheral surface of the shaft 85 is mounted on the entire outer periphery of the main lip 131.

[0011]

However, in the case of the above-described prior art, the following problems have occurred.

The sealing device (X ring) shown in FIG. 7 described above.
In the case of (1), there is a problem of fluid leakage due to occurrence of co-rotation.

That is, the sealing device 100 is fixed in the annular groove 91 only by its elastic repulsive force or the like. When the housing 90 and the shaft 80 rotate relatively, the sealing device 100 is generally used. Is set (designed) so that only the shaft 80 and the inner peripheral lips 103a and 103b slide while being fixed to the housing 90 side.

However, in some cases, the inner peripheral lips 103a and 103b may be dragged by the surface of the shaft 80 and rotate together with the shaft 80 to form a co-rotation. In this case, the outer peripheral lips 102a and 102b and the annular It will slide between the wall surfaces of the groove 91.

In this case, since the wall surface of the annular groove 91 has a rough surface due to processing reasons, the outer peripheral lip 102a, 1
02b is severely worn, and fluid leakage is likely to occur.

In the case of the sealing device shown in FIG. 8, the close contact between the main lip 130 and the shaft 85 determines the performance of the sealing device. It is desired that the main lip 130 and the shaft 85 are in close contact.

Therefore, in order to enhance the adhesion between the main lip 130 and the shaft 85, there have been adopted methods such as adjusting the setting of the seal size, increasing the rigidity of the seal, and increasing the urging force of the spring 140. However, it may be limited by space problems and other various conditions, and there has been a demand for the development of other techniques for improving the adhesion.

Further, metal powder such as iron powder is
When entering the sliding part of 30, the contact state becomes unstable,
The sealing performance may be reduced and the main lip 130
As a result, the abrasion of the seal became severe, and the deterioration of the sealing performance was increased.

The present invention has been made to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a high-quality sealing device with improved sealing performance.

[0020]

According to the present invention, there is provided a sealing device for sealing an annular gap between a shaft and a housing, the groove being formed in an inner periphery of the housing. In a sealing device provided with an outer peripheral seal mounted therein, the outer peripheral seal is provided with magnetism.

Therefore, a magnetic attraction force can be generated between the groove formed on the inner periphery of the housing and the outer peripheral seal.

In a sealing device for sealing an annular gap between a shaft and a housing, the sealing device having a main lip slidable on the surface of the shaft, wherein the main lip has magnetism. Features.

Therefore, a magnetic attraction force can be generated between the shaft and the shaft surface.

A sealing device for sealing an annular gap between a shaft and a housing, wherein the main lip is slidable on the shaft surface, and a dust lip provided on the opposite side of the main lip from the sealing fluid. , Wherein the dust lip has magnetism.

Therefore, when iron powder or the like attempts to enter from outside, it is magnetically attracted to the dust lip.

A sealing device for sealing an annular gap between a shaft and a housing, wherein the sealing device has a seal having a slidable seal lip on a shaft surface, wherein the seal does not have magnetism. It is characterized by comprising a non-magnetic portion including a seal lip tip portion and a magnetic portion having magnetism.

Therefore, it is possible to reduce the intrusion of iron powder and the like into the tip of the seal lip by adsorbing the iron powder and the like by the magnetic portion.

[0028]

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) A sealing device according to a first embodiment will be described with reference to FIG. 1 and FIG.

FIG. 1 is a schematic partial sectional view of a sealing device according to a first embodiment of the present invention, and FIG. 2 is a schematic configuration diagram showing a use state of the sealing device according to the first embodiment. is there.

The sealing device 1 shown in FIGS. 1 and 2 is a so-called X-ring, and includes a housing 90,
The shaft 8 inserted into a shaft hole provided in the housing 90
It seals the annular gap between the zero.

As shown in FIG. 2, the sealing device 1
It is used by being mounted in an annular groove 91 having a U-shaped cross section provided in the housing 90.

The sealing device 1 generally includes an outer peripheral seal 2 on the outer peripheral side and an inner peripheral seal 3 on the inner peripheral side.

In this case, the outer peripheral lip 2 is
a, 2b, and the inner peripheral seal 3 is
a, 3b, the outer peripheral lips 2a, 2b are sealed by being in close contact with the wall surface of the annular groove 91, and the inner peripheral lips 3a, 3b are slid on the shaft 80 to be sealed. (Oil etc.) side O and the atmosphere side A are shut off and sealed.

Here, the material of the inner peripheral seal 3 is the same as that of the conventional technology (known technology), and a normal rubber material is used.

On the other hand, the embodiment of the present invention is characterized in that a material having magnetism is used as the material of the outer peripheral seal 2, and for example, a magnetic rubber is used.

Thus, a magnetic attraction force is generated between the outer peripheral seal 2 and the wall surface of the annular groove 91.

Needless to say, the material of the member forming the wall surface of the annular groove 91 must be a member that generates a magnetic attraction force with a material having magnetic properties (magnetic rubber). For example, it is preferable to use an iron material or a magnet.

With the above configuration, the outer peripheral seal 2
And a magnetic attraction force is generated between the groove 91 and the wall surface of the annular groove 91,
The fixing force of the sealing device 1 to the housing 90 increases,
The possibility that the sealing device 1 rotates together with the shaft 80 to cause co-rotation is reduced, thereby reducing the possibility of sliding between the outer peripheral lips 2a, 2b and the wall surface of the annular groove 91. .

Therefore, the wear of the outer lips 2a and 2b can be suppressed, and the adhesion to the wall surface of the annular groove 91 is improved in combination with the magnetic attraction force described above, and the adhesion performance is improved.

(Second Embodiment) FIG. 3 shows a second embodiment.

FIG. 3 is a schematic configuration diagram showing a use state of the sealing device according to the second embodiment.

The sealing device 10 shown in FIG. 3 seals an annular gap between a housing 95 which is mounted concentrically and relatively rotatably and a shaft 85 inserted into the housing 95. In addition, the sealing fluid (oil or the like) side O and the atmosphere side A are shut off to prevent fluid leakage or the like.

The sealing device 10 includes a reinforcing ring 50 having a substantially L-shaped cross section, an outer peripheral seal 20 fitted on the inner periphery of a housing 95, and a seal lip slidably sealingly contacting the outer peripheral surface of the shaft 85. 30.

Here, the seal lip 30 has a main lip 31 mainly for preventing leakage of the sealing fluid and a dust lip 32 mainly for preventing intrusion of dust from the outside.

The outer periphery of the main lip 31 has a shaft 8
A spring 40 for applying a tightening force to the outer peripheral surface of No. 5 is mounted all around.

Here, the present embodiment is characterized in that a material having magnetism is used as the material of the main lip 31, for example, a magnetic rubber is used, and other sealing members are used. The outer peripheral seal 20 and the dust lip 32 are made of the same material as that of the related art (known technique), and use a normal rubber material.

Thus, a magnetic attraction force is generated between the main lip 31 and the surface of the shaft 85.

It is needless to say that the material of the shaft 85 must be a member that generates a magnetic attraction force with a material having magnetic properties (magnetic rubber). It is preferable to use

With the above configuration, a magnetic attraction force is generated between the main lip 31 and the surface of the shaft 85.
Even if the suction force of the main lip 31 on the shaft 85 increases and, for example, shaft eccentricity occurs, proper sealing performance can be maintained.

As a result, even if it is impossible to change the seal size, the seal rigidity, or the spring strength due to some restrictions, the adhesion to the shaft surface can be maintained without making these changes. And the sealing performance is improved.

(Third Embodiment) FIGS. 4 and 5 show a third embodiment.

FIGS. 4 and 5 are schematic structural views showing a use state of the sealing device according to the third embodiment.

Here, the present embodiment is different from the configuration shown in the second embodiment only in the magnetic part, and the other basic configuration is the same. The same components are denoted by the same reference numerals, and detailed description thereof will be omitted.

In this embodiment, as in the case of the second embodiment, the main lip 31a mainly for preventing leakage of the sealing fluid is attached to the seal lip 30a.
And a dust lip 32a for mainly preventing dust from entering from outside.

In the second embodiment, the main lip is provided with magnetism and the dust lip is not provided with magnetism. The form is characterized in that a material having magnetism is used as the material of the dust lip 32a. For example, a magnetic rubber is used, and other sealing members including the main lip 31a are formed by a conventional technique (known technique). ) Is used, and a normal rubber material is used.

Thus, even if iron powder or the like attempts to enter the sealed fluid side O from the atmosphere side A, the dust is magnetically attracted to the dust lip 32a, so that entry to the main lip 31a can be reduced. it can.

Accordingly, the sliding stability of the main lip 31a (the stability of the state of contact with the shaft surface) can be maintained, and
There is no increase in wear.

Further, even when the dust lip 32a is worn, or even if the dust lip 32a is reversed, iron dust or the like is deposited near the dust lip 32a, so that the penetration into the main lip 31a can be reduced.

With the above configuration, it is possible to prevent a decrease in sealing performance due to iron powder or the like, and to improve sealing performance.

In this embodiment, the portion having magnetism may be, for example, only a dust lip portion as shown in FIG. 4 or a portion from the atmosphere side A as shown in FIG. The region up to the reinforcing ring 50 may have magnetism.

(Fourth Embodiment) FIG. 6 shows a fourth embodiment.

FIG. 6 is a schematic configuration diagram showing a use state of the sealing device according to the fourth embodiment.

Here, in the present embodiment, the second and third
Only the magnetized portions are different from the configuration shown in the embodiment, and the other basic configurations are the same. Therefore, the same components are denoted by the same reference numerals. , The detailed description of which is omitted.

In this embodiment, as in the second and third embodiments, the seal lip 30b has
Main lip 31 mainly to prevent leakage of sealing fluid
b and a dust lip 32b for mainly preventing intrusion of dust from the outside.

Here, in this embodiment, the seal portion is largely divided into a non-magnetic portion P and a magnetic portion Q, and a material having magnetism, for example, a magnetic rubber is used as the material of the magnetic portion Q. The material of the non-magnetic portion P is the same as that of the prior art (known technology), and a normal rubber material is used.

That is, only the portion near the sliding portion of the seal lip 30b to the shaft 85 (near the tip of the main lip 31b and near the tip of the dust lip 32b) has no magnetism, and all other portions are magnetic. It is made to have.

Thus, when iron powder or the like contained in the sealed fluid side O tries to enter the tip of the main lip 31b, or when iron powder or the like from the atmosphere side A tries to enter the tip of the dust lip 32b. Even if it does, it is magnetically attracted to the other magnetic parts Q, so that it is possible to reduce intrusion into the tip of each lip.

Therefore, the sliding stability of the main lip 31b and the dust lip 32b (the stability of the state of contact with the shaft surface) can be maintained, and the wear does not increase.

Since the outer periphery of the main lip 31b has magnetism, when the shaft 85 is made of a material that generates a magnetic attraction force with a magnetic material such as an iron material or a magnet, the shaft 85 of the main lip 31b is The attraction force to the surface increases, and together with the tension force of the spring 40, the sealing performance is improved and the eccentricity followability is also improved.

When the non-magnetic portion at the tip of the main lip 31b wears, the distance between the magnetic portion and the surface of the shaft 85 gradually decreases, and the magnetic attraction force described above increases. The life of the main lip 31b can also be improved.

[0072]

As described above, according to the present invention, a magnetic attraction force is generated between the groove formed on the inner periphery of the housing and the outer peripheral seal by providing the outer peripheral seal with magnetism. By reducing the co-rotation between the shaft and the shaft and suppressing the wear of the outer peripheral seal, the sealing performance can be improved, and the quality is improved.

Also, by making the lip have magnetism, a magnetic attraction force is generated between the lip and the shaft surface,
By improving the adhesion, the sealing performance can be improved, and the quality is improved.

Also, by making the dust lip have magnetism, when iron powder or the like attempts to enter from the outside, the dust lip is magnetically attracted to reduce the intrusion of the iron powder or the like into the main lip. The sealing performance can be improved,
Quality is improved.

Further, the seal is made up of a non-magnetic portion including a seal lip tip portion having no magnetism, a magnetic portion having magnetism,
With this configuration, iron powder and the like are adsorbed by the magnetic portion, the intrusion of the iron powder and the like into the tip of the seal lip can be reduced, the sealing performance can be improved, and quality can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic partial cross-sectional view of a sealing device according to a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram illustrating a use state of the sealing device according to the first embodiment.

FIG. 3 is a schematic configuration diagram illustrating a use state of a sealing device according to a second embodiment.

FIG. 4 is a schematic configuration diagram illustrating a use state of a sealing device according to a third embodiment.

FIG. 5 is a schematic configuration diagram showing a use state of a sealing device according to a third embodiment.

FIG. 6 is a schematic configuration diagram illustrating a use state of a sealing device according to a fourth embodiment.

FIG. 7 is a schematic configuration diagram showing a use state of a sealing device according to a conventional technique.

FIG. 8 is a schematic configuration diagram illustrating a use state of a sealing device according to a conventional technique.

[Explanation of symbols]

 1,10 Sealing device 2,20 Outer seal 2a, 2b Outer lip 3 Inner seal 3a, 3b Inner lip 30,30a, 30b Seal lip 31,31a, 31b Main lip 32,32a, 32b Dustrip 40 Spring 50 Reinforcement Ring 80,85 Shaft 90,95 Housing 91 Ring groove

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Toshikatsu Numa, 8th Sumibori, Nagaigawa, Fukushima City, Fukushima Prefecture Inside NOK Co., Ltd. (72) Hiroki Matsui 8th, Sumibori, Nagaigawa, Fukushima City, Fukushima Prefecture, NOK F term in the company (reference) 3J006 AE16 AE17 AE41 CA01

Claims (4)

[Claims] 1. A sealing device for sealing an annular gap between a shaft and a housing, the sealing device having an outer peripheral seal mounted in a groove formed on an inner periphery of the housing, wherein the outer peripheral seal is A sealing device characterized by having magnetism. 2. A sealing device for sealing an annular gap between a shaft and a housing, the sealing device having a slidable main lip on a shaft surface, wherein the main lip has magnetism. Characteristic sealing device. 3. A sealing device for sealing an annular gap between a shaft and a housing, comprising: a main lip slidable on a surface of the shaft; and a dust lip provided on the opposite side of the main lip from the sealing fluid. When,
The sealing device according to claim 1, wherein the dust lip has magnetism. 4. A sealing device for sealing an annular gap between a shaft and a housing, comprising a seal having a slidable seal lip on a surface of the shaft, wherein the seal has no magnetism. A sealing device comprising: a non-magnetic portion including a seal lip tip portion; and a magnetic portion having magnetism.