JP3435945B2 - Initial lubricant application method for sealing device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing device in which a seal portion is coated with an initial lubricant and a method for applying the initial lubricant.

[0002]

2. Description of the Related Art Grease is generally used as an initial lubricant for a conventional oil seal. As shown in FIG. 2A, the grease 102 is formed on the inner peripheral sliding surface of the seal lip 101 of the oil seal 100. It has been applied.

This grease application has been carried out using a grease application jig 103 as shown in FIG. 2 (b). That is, the grease applying jig 103 is the oil seal 1
00 is installed concentrically inside the annular pedestal 104, and a grease storage chamber 105 for storing grease is provided inside. And the seal lip 10
A discharge port 106 for discharging grease is provided at a position corresponding to 1.
Is provided, and by applying pressure to the grease in the storage chamber 105, the grease is discharged from the discharge port 106 and applied to the seal lip 101.

[0004]

However, in the method of using the grease 102 as the initial lubricant of the seal lip 101, depending on the working environment in handling the grease 102,
Foreign matter such as cutting chips easily adheres to the seal lip 10.
There was a case where it was bitten into 1 and an initial leak occurred.

The present invention has been made in order to solve the above-mentioned prior art, and an object of the present invention is to use a wax-like lubricant which does not easily adhere to foreign matter as an initial lubricant, so that the initial stage due to the adhesion of foreign matter can be improved. It is an object of the present invention to provide a sealing device capable of preventing a leakage problem and an initial method for applying a lubricant to a sealing device capable of uniformly forming a film of a wax-like lubricant.

[0006]

In order to achieve the above object, in the present invention, a seal is provided between two members which are concentrically and relatively movable to each other, and fixed to one member. A wax-like lubricant is used as the initial lubricant in a sealing device that includes a fixed portion and a seal portion that slidably and slidably contacts the other member, and applies the initial lubricant to the seal portion. And

As described above, when the wax-like lubricant is used as the initial lubricant, the foreign matter is hard to adhere because it is in a solid state, and the foreign matter can be prevented from being caught as much as possible.

If a wax-like lubricant is applied to the sliding surface of the seal portion with a uniform film thickness, a good initial lubrication state can be maintained over the entire sliding surface of the seal portion and the initial wear of the sliding surface is prevented. can do.

The wax-like lubricant is dissolved in a solvent to form a solution, the solution is applied to the sliding surface of the seal portion, and then the solvent is evaporated to form a film of the wax-like lubricant.

By thus applying the solid wax-like lubricant as a solution, a wax-like lubricant film can be easily formed uniformly.

The application of the solution is characterized in that the sealing device is supported with the surface of the seal portion to be coated exposed, and the exposed surface of the seal portion to be coated is immersed in the solution. .

[0012] With this arrangement, since the surface to be coated of the seal portion is simply dipped in the solution, the coating operation is further facilitated.

A first coating jig provided with a bath of a solution in which a waxy lubricant is dissolved in a solvent, and a second coating jig provided above the first coating jig so as to be vertically movable. A sealing lip is provided on the inner periphery of the annular sealing device so as to surround the bath at the opening edge of the bath of the first coating jig, and the sealing device is provided with the first coating jig and the second coating jig.
It is sandwiched and fixed by a coating jig, and furthermore, the contact portions between the upper and lower ends of the sealing lip and the first and second coating jigs are sealed, and the bath and the space surrounded by the sealing lips are divided into the first and second spaces.
Preventing solution leakage in the bath with coating jig and sealing device
A sealing region , wherein the liquid level height of the solution stored in the bath is raised and lowered to a space surrounded by a seal lip continuing to the upper end of the bath, so that the inner periphery of the seal lip is dipped in the solution for application. To do.

By doing so, it becomes possible to apply uniformly without uneven coating.

Further, if the film thickness of the wax-like lubricant film formed is controlled by changing the concentration of the solution, the film thickness can be controlled very easily.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below based on the illustrated embodiments.

FIG. 1 shows a sealing device according to an embodiment of the present invention, which generally seals between a housing 1 which is concentrically mounted to be relatively movable and a movable shaft 2 which is rotatable or reciprocally movable. A fixed portion 3 fixed to the housing 1 and a seal lip 4 as a seal portion slidably and slidably contacting the movable shaft 2 are provided.

A film of wax-like lubricant 5 is provided as an initial lubricant on the sliding surface of the inner circumference of the seal lip 4.

The wax-like lubricant 5 is a solid lubricant formed by adding an additive to a petroleum refined fixing component, and is not a sticky material such as grease but a solid lubricant like wax.

As described above, when the wax-like lubricant 5 is used as the initial lubricant, the foreign matter is hard to adhere because it is in a solid state, and the foreign matter can be prevented from being caught as much as possible.

If the wax-like lubricant 5 is applied to the sliding surface of the seal lip 4 with a uniform film thickness, a good initial lubrication state can be maintained over the entire circumference of the sliding surface of the seal lip 4, and the initial sliding surface can be maintained. Wear can be prevented.

Next, a method of applying the wax-like lubricant will be described.

Since the wax-like lubricant 5 is solid, it is dissolved in a solvent to form a solution, and this solution is applied to the sliding surface of the seal lip 4 and then the solvent is evaporated to evaporate the wax-like lubricant 5
It is effective to produce a film of

Examples of the wax-like lubricant include N
OK Gruba Co., Ltd. product name "SEALOVE L101"
Is used, and cyclohexane or the like is used as the solvent. By thus coating the solid wax-like lubricant as a solution, a wax-like lubricant film can be easily formed uniformly.

FIG. 1B shows an example of a coating device.

That is, this coating device supports the sealing device 6 with the surface of the seal lip 4 to be coated exposed, and dips the exposed surface of the seal lip 4 to be coated in the solution 7. Is.

That is, a first coating jig 9 provided with a bath 8 for a solution 7 in which a wax-like lubricant is dissolved in a solvent, and a second coating jig provided above the first coating jig 9 so as to be vertically movable. The tool 10 is provided. The first coating jig 9 is provided with a bath 8 on its upper surface and a supply / recovery port 11 for supplying and recovering the solution 7 on its lower surface side.

The opening edge of the bath 8 is circular and is set to be substantially equal to the inner diameter of the seal lip 4 of the annular sealing device 6.

On the other hand, the second coating jig 10 fixes the annular sealing device between the first coating jig 9 and the fixing device by pressing it from above, and is constituted by a lid body which covers the bath 8.
An air vent hole 12 and a liquid level sensor 13 are provided. As the liquid level sensor 13, for example, a general float switch can be used and is used as a liquid level limit switch.

Using the coating apparatus having the above structure, the coating operation is performed as follows.

That is, the seal lip 4 of the ring-shaped sealing device 6 is arranged so as to surround the bath 8 at the opening edge of the bath 8 of the first coating jig 9, and the sealing device 6 is arranged between the first coating jig 9 and the first coating jig 9. 2 It is sandwiched and fixed by the coating jig 10.

Further, the upper and lower ends of the seal lip 4 and the first and first
The contact portion with the second coating jigs 9 and 10 is sealed.

This sealing may be performed by pressing the upper and lower ends of the seal lip 4 as shown in the figure,
As shown in FIG. 1C, the packing 14 may be separately provided for sealing.

Next, the height of the liquid surface of the solution 7 stored in the bath 8 is raised and lowered to a space surrounded by the seal lip 4 at the upper end of the bath 8 so that the inner circumference of the seal lip 4 is immersed in the solution 7. Apply.

By doing so, it becomes possible to apply the coating uniformly without uneven coating.

Furthermore, if the film thickness of the film of the wax-like lubricant 5 produced is controlled by changing the concentration of the solution 7, the film thickness can be controlled very easily.

The wax concentration of the solution 7 is preferably about 10 to 40%, though it depends on the coating film thickness. When the wax concentration is low, the film thickness is thin, and when the wax concentration is high, the film thickness is thick. The lower limit is determined to ensure lubricity, and the upper limit is determined in consideration of dripping during transportation.

As a method for applying the solution, instead of using the jig, for example, the seal lip 7 may be sprayed. In the above-mentioned dipping method, the liquid surface of the solution is always in contact with the atmosphere and the solvent evaporates, so that it is necessary to control the concentration of the solvent.

On the other hand, according to the spraying method such as ultrasonic spraying, the solvent is less exposed to the atmosphere and the concentration change is within the tolerance range, so that there is an advantage that the concentration control work can be eliminated.

[0040]

As described above, according to the present invention,
Since the wax-like lubricant is used as the initial lubricant, foreign matter is unlikely to adhere during handling and the foreign matter can be prevented from being caught as much as possible.

If a wax-like lubricant is applied to the sliding surface of the seal portion with a uniform film thickness, a good initial lubrication state can be maintained over the entire circumference of the sliding surface of the seal portion, and the initial wear of the sliding surface can be maintained. Can be prevented.

If a solid wax-like lubricant is applied as a solution, a wax-like lubricant film can be easily formed uniformly.

Further, if the application of the solution is carried out by immersing the surface to be coated in the solution, the surface to be coated of the seal portion is only immersed in the solution, so that the coating operation becomes easier.

Further, during the coating operation, the height of the liquid surface of the solution stored in the bath is raised and lowered to the space surrounded by the seal lip at the upper end of the bath so that the inner periphery of the seal lip is dipped and the solution is coated. By doing so, it becomes possible to apply uniformly without uneven coating.

Furthermore, if the film thickness of the wax-like lubricant film formed is controlled by changing the concentration of the solution, the film thickness can be controlled very easily.

[Brief description of drawings]

FIG. 1 (a) is a sectional view of a main part of a sealing device according to an embodiment of the present invention, FIG. 1 (b) is a half sectional view showing a solution coating device, and FIG. 1 (c) is a sealing device. It is a figure which shows the state which used the packing for the seal.

FIG. 2 (a) is a sectional view showing the conventional sealing device,
(b) is a half sectional view of a conventional grease applying jig.

[Explanation of symbols]

1 housing 2 movable axes 3 Fixed part 4 Seal lip (seal part) 5 waxy lubricant 6 Sealing device 7 solution 8 bathtubs 9 First coating jig 10 Second coating jig 11 Supply / recovery port 12 Air vent hole 13 Liquid level sensor 14 packing

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Claims (2)

(57) [Claims] 1. A first coating jig provided with a bath of a solution in which a wax-like lubricant is dissolved in a solvent, and a second coating jig provided above the first coating jig so as to be vertically movable. A sealing lip is provided on the inner circumference of the annular sealing device so as to surround the bath at the opening edge of the bath of the first coating jig, and the sealing device is provided with the first coating jig and the second coating cure. Then, the upper and lower ends of the seal lip and the contact portion between the first and second application jigs are sealed, and the bath and the space surrounded by the seal lip are first and second application cures. Solution in the bath with tools and sealing devices
The seal area is a leak-proof area, and the liquid level height of the solution stored in the bath is raised and lowered to the space surrounded by the seal lip continuing to the upper end of the bath to apply the solution by immersing the inner circumference of the seal lip. A method for applying an initial lubricant for a sealing device, comprising: 2. The method for applying an initial lubricant to a sealing device according to claim 1, wherein the film thickness of the wax-like lubricant film formed is controlled by changing the concentration of the solution.