JP7254554B2 - Method for assembling sealing device and lubricating material for assembling sealing device - Google Patents

Description

The present invention relates to a sealing device assembly method and a sealing device assembly lubricant.

2. Description of the Related Art Generally, an engine of an automobile or the like uses a rubber-engagement type engine seal that is fitted to the housing of the engine in order to seal engine oil inside and prevent muddy water from entering from the outside.
A rubber engagement type engine seal is required to have a high detachment load in order to prevent the seal from coming off after assembly.
Therefore, for example, if one or both of the outer diameter of the seal is enlarged and the inner diameter of the housing is reduced to increase the engagement allowance, which is the difference between the outer diameter of the seal and the inner diameter of the housing, the separation load is increased. can be done.

On the other hand, the mating load should be reduced in order to improve seal assembly.
However, increasing the mating allowance increases the mating load.
Further, if the mating allowance is increased, the rubber at the mating portion is likely to be distorted, causing so-called springback, which causes a problem that the seal is likely to come off.

Alternatively, as a method for reducing the mating load, application of an oil-based lubricant such as oil can be used.
However, when an oil-based lubricant such as oil is applied, the detachment load is reduced.

Patent Document 1, which is an example of conventional technology, discloses an application step of applying water to the inner peripheral surface of the housing, which is the surface to be press-fitted, and press-fitting the press-fit portion of the oil seal into the inner peripheral surface of the housing in which the water is applied. A technique for press-fitting an oil seal is disclosed, which includes a press-fitting step to press-fit and a press-fitting holding step to hold the press-fitted state of the press-fitting portion into the inner peripheral surface of the housing.

In Patent Document 1, when water is applied in the form of a mist, the amount of water supplied to the inner peripheral surface of the housing can be minimized, and water can be supplied to the entire inner peripheral surface without leakage. It is described that this is preferable because water does not drip onto areas other than the surface to be press-fitted after pressing.
That is, it has been suggested that water, which is a lubricant, remains between the oil seal and the housing, and that the water may enter areas other than the press-fitting surface.

JP 2012-159133 A

There is a demand for a technique that prevents lubricant from remaining between the engine seal and the housing of the engine, thereby preventing the seal from slipping off and improving the ease of assembly.

SUMMARY OF THE INVENTION It is an object of the present invention to reduce the engagement load during assembly and increase the disengagement load after assembly without increasing the number of man-hours.

The present invention, which solves the above-mentioned problems and achieves its objectives, is a method of assembling a sealing device that seals a part of a mechanism including a housing, wherein one of the inner peripheral surface of the housing and the outer peripheral surface of the sealing device is Alternatively, disposing an assembly lubricant on both sides, and moving the outer peripheral surface of the sealing device while being in contact with the inner peripheral surface of the housing, wherein deterioration of the assembly lubricant causes the housing to a method of assembling a sealing device, wherein the coefficient of friction between the inner peripheral surface of the sealing device and the outer peripheral surface of the sealing device is increased.

It is preferable that the method for assembling the sealing device configured as described above further includes operating the mechanism including the housing, wherein the lubricant for assembly changes with the operation of the mechanism including the housing.

In the method for assembling the sealing device having the above configuration, it is preferable that the assembly lubricant is an aqueous solution, and that water contained in the assembly lubricant disappears or decreases due to the deterioration of the assembly lubricant. .

In the method of assembling the sealing device having the above configuration, it is preferable that the assembly lubricant is an aqueous solution, and the temperature of the assembly lubricant rises to the boiling point of water as the mechanism operates.
In addition, in the method of assembling the sealing device having this configuration, it is preferable that the operating temperature of the sealing device is 100° C. or higher.

Alternatively, the present invention is the lubricant for assembly in the method for assembling the sealing device configured as described above, wherein the lubricant for assembly contains water and a surfactant.

In the lubricant for assembling the sealing device having the above structure, it is preferable that the main component is water.

In the lubricant for assembly of the sealing device configured as described above, the surfactant is preferably an amine-based surfactant.

Preferably, the lubricating material for assembly of the sealing device having the above structure further contains a solvent having a boiling point lower than that of water.
Here, ethanol or methanol can be exemplified as the solvent having a boiling point lower than that of water.

Advantageous Effects of Invention According to the present invention, it is possible to reduce the engagement load during assembly and increase the disengagement load after assembly without increasing the number of man-hours.

It is a figure explaining the assembly method of the sealing device which concerns on this embodiment.

Embodiments of the present invention will be described below with reference to the drawings.
However, the present invention is not to be construed as limited by the description of the following embodiments.

<Embodiment>
FIG. 1 is a diagram illustrating a method of assembling a sealing device according to this embodiment.

First, as shown in FIG. 1(A), one or both of the outer peripheral surface 11 of the seal 10 as a sealing device and the inner peripheral surface 21 of the housing 20 are coated with a lubricant 1 as an insertion aid by brushing or dip coating. Or it is arranged by spray coating or the like.
Here, considering the sizes of the seal 10 and the housing 20 and work efficiency, it is preferable to use spray coating.

The lubricant 1, which is a lubricant for assembly, is interposed between the inner peripheral surface 21 of the housing 20 and the outer peripheral surface 11 of the seal 10 to reduce the coefficient of friction and reduce the mating load during assembly. .

The seal 10 is a sealing device that has a mating portion on the outer peripheral surface 11 and a shaft through hole 12 through which the shaft 40 is inserted. As the seal 10, an engine seal can be exemplified.
An elastic material may be used as the material of the mating portion, and rubber can be exemplified as such an elastic material.
That is, the seal 10 can be exemplified by a rubber engagement type engine seal.

A housing 20 is part of the mechanism and has an inner peripheral surface 21 .
An example of such a mechanism is an engine.

In order to engage the seal 10 with the housing 20, a high separation load after assembly is required in order to prevent the seal 10 from coming off.
Therefore, for example, by enlarging the outer diameter of the seal 10 to increase the engagement allowance, which is the difference between the outer diameter of the seal 10 and the inner diameter of the housing 20, the separation load can be increased.
It is also possible to increase the engagement allowance by enlarging the outer diameter of the seal 10 and reducing the inner diameter of the housing 20, or by reducing the inner diameter of the housing 20 without enlarging the outer diameter of the seal 10. .

On the other hand, in order to improve the assemblability of the seal 10, the mating load should be low.
However, if the mating allowance is increased as described above, the mating load will increase.
Further, if the mating allowance is increased, the rubber of the mating portion is likely to be distorted, and there is also the problem that the seal 10 is likely to come off from the housing 20 due to so-called springback.

Alternatively, an oil-based lubricant such as oil can be applied between seal 10 and housing 20 to reduce mating loads.
However, interposing an oil-based lubricant such as oil between the seal 10 and the housing 20 reduces the separation load.

As described above, it has been difficult to achieve both the prevention of the seal 10 from coming off and the improvement of the assembleability of the seal 10 .
Therefore, in the present embodiment, the lubricating material 1 is used to achieve a low mating load, and the lubricating material 1 is changed in quality after mating so that the space between the inner peripheral surface 21 of the housing 20 and the outer peripheral surface 11 of the seal 10 is reduced. A high detachment load is realized by increasing the coefficient of friction, and both a low mating load during assembly and a high detachment load after assembly are achieved, preventing the seal 10 from coming off and improving the assembleability of the seal 10. can be made compatible.

Note that the lubricant 1 may be an aqueous solution containing, for example, a surfactant.
When the lubricant 1 is an aqueous solution containing a surfactant, a layered film of water and surfactant is formed to improve the sliding, so that the mating load can be reduced.

Moreover, the main component of the lubricant 1 is preferably water.
That is, it is preferable that the content of water in the lubricant 1 is higher than that of the surfactant.
In addition, this content comparison may be performed by volume, but is not limited to this, and may be performed by mass.

As the surfactant contained in the lubricant 1, it is preferable to use a water-soluble amine-based surfactant.
If an amine-based surfactant is used as the surfactant, rusting of the housing can be prevented.
Here, the amine-based surfactant refers to a surfactant having an amino group, and can be exemplified by triethanolamine and methyldiethanolamine. More specifically, Daphne W Cleaner (registered trademark) is used. can be done.

Next, as shown in FIG. 1B, the seal 10 having the lubricant 1 on the outer peripheral surface 11 is press-fitted into the housing 20 having the lubricant 1 on the inner peripheral surface 21 .
This press fitting is performed by the assembly jig 30 .

The assembly jig 30 is a press-fitting jig capable of applying force to the seal 10 in a direction in which the seal 10 is pushed.

Although the assembly jig 30 pushes the seal 10 in FIG.

Then, as shown in FIG. 1C, the shaft body 40 is inserted through the shaft through hole 12 of the seal 10 while the seal 10 is press-fitted into the housing 20 .

The shaft 40 is a component that is attached to a mechanism including the housing 20, and an example of the shaft 40 is a crankshaft.

Then, as shown in FIG. 1C, the mechanism including the housing 20 through which the shaft 40 is inserted is operated.
For example, when an engine including the housing 20 through which the shaft 40, which is a crankshaft, is inserted is operated, the lubricant 1 deteriorates with the operation of the engine.
Here, as the temperature of the housing 20 rises, the temperature of the lubricant 1 also rises, and the moisture content of the lubricant 1 intervening between the seal 10 and the housing 20 disappears or decreases due to evaporation.
As a result, the coefficient of friction between the inner peripheral surface 21 of the housing 20 and the outer peripheral surface 11 of the seal 10 increases, so that the detachment load increases and the seal 10 can be prevented from coming off after assembly.
In addition, since the lubricating material 1 deteriorates with the operation of the mechanism including the housing 20, it can be realized without increasing the number of man-hours.

Here, since the lubricant 1 is an aqueous solution, it is preferable that the temperature of the lubricant 1 rises to the boiling point of water as the engine operates.
At this time, since the boiling point of water under atmospheric pressure is 100° C., the operating temperature of the seal 10 is preferably 100° C. or higher.
However, the present invention is not limited to this, and even if the temperature of the lubricant 1 does not rise to the boiling point of water, the moisture content of the lubricant 1 may be lost or reduced by drying.

In addition, the lubricant 1 may contain a solvent having a boiling point lower than that of water.
This is because if the lubricant 1 contains a solvent having a boiling point lower than that of water, evaporation of the water and the solvent from the lubricant 1 is accelerated, that is, deterioration of the lubricant 1 occurs quickly.
Ethanol and methanol can be exemplified as the solvent having a boiling point lower than that of water.

As described above, according to this embodiment, it is possible to reduce the engagement load during assembly and increase the disengagement load after assembly without increasing the number of man-hours.

The sealing device according to the present embodiment described above can be applied not only to engine front seals or rear seals, but also to motor seals or valve stem seals used when sealing a part of a motor. It is also possible to apply to
In particular, seals such as valve stem seals, which are located close to the internal combustion engine, are used at a high temperature of 100° C., and water in the lubricant quickly disappears or decreases during operation. Application of the device is particularly preferred.

In addition, although the sealing device according to the present embodiment described above changes the quality of the lubricant 1 with the operation of the mechanism including the housing 20, the present invention is not limited to this.
Lubricants that change properties without movement of the mechanism including the housing may be used.
For example, a lubricant that deteriorates when left for a predetermined time after application may be used, or a lubricant that deteriorates when exposed to a high-temperature environment after application until the mechanism operates may be used. good.

In addition, in the present embodiment, an engine seal has been exemplified and explained as a sealing device, but the present invention is not limited to such dynamic seals, and can also be applied to static seals typified by gaskets. be able to.

Reference Signs List 1 Lubricant 10 Seal 11 Outer peripheral surface 12 Shaft through hole 20 Housing 21 Inner peripheral surface 30 Mounting jig 40 Shaft

Claims (9)

A method of assembling a sealing device for sealing a portion of a mechanism including a housing, comprising:
placing an assembly lubricant on one or both of the inner peripheral surface of the housing and the outer peripheral surface of the sealing device; and moving the outer peripheral surface of the sealing device while being in contact with the inner peripheral surface of the housing. including
By operating a mechanism including the housing, the temperature of the assembly lubricant is raised as the temperature of the housing rises, and
By evaporating moisture in the assembly lubricant interposed between the housing and the sealing device, the coefficient of friction between the inner peripheral surface of the housing and the outer peripheral surface of the sealing device is reduced by the evaporation. A method of assembling a sealing device, characterized in that the sealing device is increased more than before . The assembly lubricant is an aqueous solution,
2. The method of assembling a sealing device according to claim 1, wherein the temperature of said assembly lubricant rises to the boiling point of water as said mechanism operates. 3. The method of assembling a sealing device according to claim 2 , wherein the sealing device is used at a temperature of 100[deg.] C. or higher. The assembly lubricant in the sealing device assembly method according to claim 1,
A lubricant for assembly of a sealing device, characterized in that it contains water and a surfactant. 5. The lubricating material for assembling a sealing device according to claim 4 , wherein the main component is water. 6. The lubricant for assembling a sealing device according to claim 4 , wherein said surfactant is an amine-based surfactant. 7. The lubricant for assembling a sealing device according to claim 6 , wherein the amine surfactant is triethanolamine or methyldiethanolamine. The lubricant for assembling a sealing device according to any one of claims 4 to 7 , further comprising a solvent having a boiling point lower than that of water. The sealing device assembly lubricant according to any one of claims 4 to 7 , further comprising ethanol or methanol.

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