JP3873469B2 - Sealing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sealing device used for, for example, an axle part of an automobile.
[0002]
[Prior art]
Conventionally, as this kind of sealing device, there is one shown in FIG. 3, for example.
[0003]
FIG. 3 is a schematic cross-sectional view showing a usage state of the sealing device according to the prior art.
[0004]
As shown in FIG. 3, the sealing device 100 seals an annular gap between the shaft 111 and the housing 104, and a cover 107 is attached to the end face 106 side of the housing 104, The housing 104 and the cover 107 are sandwiched and fixed in the axial direction.
[0005]
The sealing device 100 generally includes a metal ring 102 and a seal body 101 made of a rubber-like elastic body fixed to the metal ring 102 by integral molding or baking.
[0006]
An annular fixing portion 103 is provided on the outer peripheral side of the seal body 101.
[0007]
On the other hand, by providing the stepped portion 108 in the housing 104, the annular groove 105 is formed when the cover 107 is attached to the housing 104 (for example, both are tightened with a bolt or the like).
[0008]
That is, the above-described fixing portion 103 is fixed by being fitted into the annular groove 105. After the fixing portion 103 is arranged on the stepped portion 108 of the housing 104, the fixing portion 103 is attached by attaching the cover 107. The step 108 and the end face 107a of the cover 107 are clamped and fixed in the axial direction (vertical direction in the figure) (the cover 107 in the figure is loaded in the D direction).
[0009]
A main seal lip 109 and a sub seal lip 110 are provided on the inner peripheral side of the seal main body 101, and both are in sealing contact with the shaft 111.
[0010]
In this way, oil is sealed on the A side and grease is sealed on the B side in the figure to prevent each from entering the opposite side.
[0011]
Further, the outer periphery of the fixing portion 103 is in close contact with the inner periphery of the annular groove 105, and foreign matter such as dust that has entered from the outside E, that is, between the housing 104 and the cover 107, enters the B side inside. Is preventing.
[0012]
Further, the protrusion 112 provided on the cover 107 side of the fixing portion 103 is in close contact with the cover 107, thereby similarly preventing foreign matter from entering from the outside E to the A side.
[0013]
[Problems to be solved by the invention]
However, in the case of the prior art as described above, the following problems have occurred.
[0014]
In the case of the above-described prior art configuration, the external E and the B side are always sealed, the B side is cooled to a negative pressure state, and the sealing device 100 is adsorbed to the housing 104 side. Become.
[0015]
As a result, the sealing device 100 is firmly fixed to the housing 104 due to the fitting force of the fixing portion 103 to the annular groove 105 and the above-described adsorption force.
[0016]
Then, when removing the sealing device 100 from the housing 104, for example, during maintenance (bearing inspection of the shaft 111, etc.), the sealing device 100 could not be easily removed, and workability was poor.
[0017]
The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to provide a sealing device that improves workability when removing (pulling out) the housing.
[0018]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, the housing is fitted into an annular groove formed by a housing concentrically provided on the shaft and a cover of the housing, and the housing and the cover are used in the axial direction. In a sealing device that includes a fixing portion that is sandwiched and fixed and that seals a gap between the housing and the shaft, the fixing portion has an inclined surface that increases in diameter from the inside of the housing toward a joint portion between the housing and the cover. The seal lip is in close contact with the inner periphery of the annular groove and has a flexible seal lip that can be bent and deformed in a direction away from the inner periphery of the annular groove, and the axial direction of the contact portion while being positioned with respect to the inner periphery of the annular groove between a guide portion having a communicating portion communicating with both ends, the pressing has been the cover on the cover when the fixing part is sandwiched and fixed in the axial direction by the housing and the cover A protrusion for sealing, between projecting the force of the seal lip,
And a groove for preventing deformation of the seal lip due to pressing deformation of the protrusion .
[0019]
Therefore, when removing the sealing device from the housing, first, the cover is removed, and the sealing device is pulled out. In this case, the sealing lip is expanded by an inclined surface that increases in diameter from the inside of the housing toward the joint between the housing and the cover. It is configured to be in close contact with the inner periphery of the annular groove, and has a flexibility that can be bent and deformed in a direction away from the inner periphery of the annular groove. Since a gap is formed away from the inner periphery and pressure is released to the cover side, the sealing device can be easily pulled out.
[0020]
Further, since the sealing device is positioned with respect to the annular groove by the guide portion, the sealing device can be maintained in a stable state.
[0022]
In addition, even when the gap between the cover and the cover is sealed, the seal lip is not affected by providing the groove.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Exemplary embodiments of the present invention will be described in detail below with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described in this embodiment are not intended to limit the scope of the present invention only to those unless otherwise specified. Absent.
[0024]
A sealing device according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.
[0025]
The sealing device according to the present embodiment seals an annular gap between a shaft (not shown) and a housing 10 provided concentrically with the shaft, and on the end surface 10a side of the housing 10, By attaching the cover 20, the housing 10 and the cover 20 are sandwiched and fixed in the axial direction.
[0026]
The sealing device according to the present embodiment is characterized by the fixing portion 1 that is fitted and fixed to the annular groove K formed by attaching the housing 10 and the cover 20 described in the above-described conventional technology. As for the configuration of the shaft side seal and the like, the configuration described with reference to FIG. 3 described above and other various known techniques may be applied, and the description thereof is omitted.
[0027]
Therefore, FIG. 1 shows only the vicinity of the fixed part, which is the main part of the sealing device according to the embodiment of the present invention.
[0028]
In FIG. 1, for ease of explanation (to make it easier to understand the tightening margin of a seal lip or the like), the sealing device is shown in a schematic configuration cross-sectional view in the vicinity of its fixing portion in a state before being mounted. For the cover 20 and the cover 20, only the outline indicating the position when the sealing device is mounted is shown.
[0029]
The sealing device according to the present embodiment generally includes a metal ring 2 and a seal body 3 made of a rubber-like elastic body that is fixed to the metal ring 2 by integral molding or the like.
[0030]
And the annular fixing | fixed part 1 is provided in the outer peripheral side of a sealing device, as shown in FIG.
[0031]
On the other hand, by providing the housing 10 with the stepped portion 10c, the annular groove K is formed when the cover 20 is attached to the housing 10 (for example, both are tightened with a bolt or the like).
[0032]
That is, the fixing part 1 described above is fitted and fixed in the annular groove K. After the fixing part 1 is arranged on the step part 10c of the housing 10, the fixing part 1 is The step 10c and the end surface 20a of the cover 20 are clamped and fixed in the axial direction (vertical direction in the figure) (the cover 20 in the figure is loaded downward).
[0033]
Each configuration will be described in more detail. The metal ring 2 extends from the inner circumferential direction toward the outer circumferential direction, and the planar portion 2a extends from the inner circumferential direction to the outer circumferential direction, and extends substantially vertically from the planar portion 2a (from the cover 20 side to the housing 10 side). And a cylindrical portion 2b supported on the inner periphery of the annular groove K.
[0034]
Therefore, when the cover 20 is attached to the housing 10, the flat portion 2 a side is pressed by the cover 20, and the end portion side of the cylindrical portion 2 b is supported by the housing 10, so that the axial direction (vertical direction in the figure) ).
[0035]
Further, the seal body 3 includes a guide 4 positioned on the outer periphery of the cylindrical portion 2 b of the metal ring 2, and a seal lip 5 positioned on the outer peripheral side of the cylindrical portion 2 b of the metal ring 2 and positioned closer to the cover 20 than the guide 4. And two protrusions 6 and 7 located on the cover 20 side of the flat surface portion 2a of the metal ring 2.
[0036]
Here, the guide 4 plays a role of having a function of positioning the housing 10 (annular groove K) when it is mounted or used, and is provided on the inner periphery of the housing 10 (inner periphery of the annular groove K). It is set to the extent of contact.
[0037]
Further, the guide 4 is provided with a groove 4 a as a communicating portion that communicates with both axial ends of the abutting portion when the guide 4 abuts on the inner periphery of the housing 10, and fluid is blocked by the guide 4. It can be moved freely without any problems.
[0038]
2 is a schematic diagram showing the relationship between the guide 4 and the groove 4a when the portion of the guide 4 is viewed from the (V) direction in FIG.
[0039]
Needless to say, the shape, size, number, etc. of the grooves 4a may be set as appropriate according to the use environment.
[0040]
The seal lip 5 is in close contact with the inner periphery 10b of the housing 10 and has a sealing function. The seal lip 5 has an interference. The seal lip 5 is joined to the housing 10 and the cover 20 from the inside of the housing 10. The inner surface 10b (the inner periphery of the annular groove) of the housing 10 is in close contact with the inclined surface 5a that increases in diameter toward the portion, and is flexible so that it can be deformed in a direction away from the inner periphery 10b of the housing 10. It has a shape that facilitates escape of the pressure on the B side.
[0041]
The seal lip 5 is brought into close contact with the inner periphery 10 b of the housing 10 only in the vicinity of the joint portion between the housing 10 and the cover 20.
[0042]
Further, the protrusions 6 and 7 also have a tightening margin so that when the cover 20 is attached to the housing 10, the protrusions 6 and 7 are pressed by the cover 20 and have a sealing function.
[0043]
A groove 8 is provided between the protrusion 6 and the seal lip 5.
[0044]
The groove 8 is provided so that the seal lip 5 is not affected and deformed even when the projection 6 is pressed and deformed by the cover 20, that is, the seal lip 5 due to the pressure deformation of the projection 6. The size, shape, and the like are set according to the seal material, the deformation amount of the protrusion 6 and the like.
[0045]
With the above-described configuration, first, when assembling each part, the sealing device is mounted on the housing 10 from the top to the bottom in the drawing.
[0046]
At this time, as described above, since the plurality of guides 4 are mounted while being positioned on the inner periphery 10b of the housing 10, they are mounted at appropriate positions.
[0047]
By attaching the cover 20, the protrusions 6 and 7 are pressed to form a sealing portion between the end surface 20 a of the cover 20, and the fixing portion 1 of the sealing device is pivoted by the housing 10 and the cover 20. It is clamped in the direction and fixed.
[0048]
Here, when the above-described protrusion 6 is pressed, it is pressed downward in the figure, but since the groove 8 is formed, the seal lip 5 is deformed under the influence. Without adversely affecting the sealing performance.
[0049]
As described above, the seal lip 5 prevents foreign matter such as dust entering from the outside E, that is, from between the housing 10 and the cover 20, from entering the inside B side. Intrusion of foreign matter from the outside E to the A side is prevented.
[0050]
Next, a case where the sealing device is removed from the housing 10 during maintenance (such as shaft bearing inspection) will be described.
[0051]
First, the cover 20 is removed.
[0052]
Here, even if the internal (B side) atmospheric pressure is in a negative pressure state, the seal lip 5 is configured to easily escape the B side pressure as described above, and the sealing device can be easily attached to the housing 10. Can be pulled out from.
[0053]
And since the close part to the inner periphery 10b of the seal lip 5 is in a position close to the joint part between the housing 10 and the cover 20, the close contact state can be completely released by pulling out the sealing device a little.
[0054]
An appropriate jig or the like may be used when pulling out the sealing device.
[0055]
In this way, the sealing device can be pulled out more easily by releasing the negative pressure inside (B side).
[0056]
As described above, workability when removing (pulling out) the sealing device from the housing is improved.
[0057]
In addition, the seal with the housing has a structure in which the seal lip is in close contact only in the vicinity of the joint between the housing and the cover, but since the guide is provided, the sealing device itself is sufficiently positioned and stable. Since it becomes a state, sealing performance is also maintained.
[0058]
【The invention's effect】
As described above, according to the present invention, when removing the sealing device from the housing, the cover is first removed and the sealing device is pulled out. In this case, the sealing lip is formed from the inside of the housing to the joint between the housing and the cover. Even if a negative pressure is acting on the housing side, it has a structure that adheres to the inner periphery of the annular groove by an inclined surface that expands as it goes, and has flexibility to bend and deform in a direction away from the inner periphery of the annular groove. The pressure easily escapes to the cover side and can be easily pulled out, improving workability.
[0059]
Further, since the sealing device is positioned with respect to the annular groove by the guide portion, the sealing device can be maintained in a stable state, and the sealing performance can be maintained.
[0060]
When the housing and the cover are sandwiched and fixed in the axial direction, a groove is provided between the seal lip and the protrusion pressed against the cover by being pressed by the cover, so that the protrusion is sealed between the cover and the cover. Even in this case, the sealing lip is not adversely affected and the sealing performance can be maintained.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a main part (fixing part) of a sealing device according to an embodiment of the present invention.
FIG. 2 is a schematic diagram illustrating a guide portion of the sealing device according to the embodiment of the present invention.
FIG. 3 is a schematic cross-sectional view showing a usage state of a sealing device according to the prior art.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Fixing part 2 Metal ring 2a Flat part 2b Cylindrical part 3 Seal main body 4 Guide 4a Groove 5 Seal lip 6,7 Protrusion 8 Groove 10 Housing 10a End surface 10b Inner periphery 10c Step part 20 Cover 20a End surface

Claims (1)

A fixing portion that is fitted in an annular groove formed by a housing concentrically provided on the shaft and a cover of the housing and is clamped and fixed in the axial direction by the housing and the cover; In a sealing device that seals the gap between
The fixing part is
A sealing lip that is in close contact with the inner periphery of the annular groove by an inclined surface that expands from the inside of the housing toward the joint between the housing and the cover, and that can be flexibly deformed in a direction away from the inner periphery of the annular groove; ,
A guide portion having a communicating portion communicating with both ends in the axial direction of the contact portion while being positioned with respect to the inner periphery of the annular groove;
A protrusion that is pressed against the cover when the fixing portion is clamped and fixed in the axial direction by the housing and the cover, and seals between the cover,
A sealing device comprising a groove for preventing deformation of the seal lip due to pressure deformation of the protrusion between the protrusion and the seal lip .

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