JPH10220591A - Sealing device and manufacture of the sealing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a quality sealing device that may be easily manufactured at lower costs, and a manufacturing method for the sealing device. SOLUTION: A sealing device comprises a metal ring 2, a metal ring 10 and a PTFE seal member 15 having a seal lip part 17, all of which are integrally assembled such that the ring 2 is fitted on the ring 10 so at to contact at its inner periphery 7 of its outer peripheral part 3 with the outer periphery 18 of the outer peripheral part 11 of the ring 10 while holding the seal member 15 between their flange parts 6 and 12. The obtained assembly is integrally coated with a rubber continuous coating part 20 having an axial end part 21, an outer periphery fitting part 22, a wall part 23, a seal lip part 24 and an airtight joint part 26.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing device such as an oil seal used for a shaft sealing portion of various devices, particularly a sealing device having a rubber-like elastic seal lip and a resin seal lip, and the sealing device. And a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, this type of sealing device is shown in FIGS.
As shown in the figure, a large number of parts were integrated and caulked.

[0003] In a sealing device 100 shown in FIG. 13, a rubber lip 102 and an outer peripheral gasket 103 are continuously baked directly on an outer peripheral metal ring 101, vulcanized and formed, and a resin sealing member 104 and a metal ring 105 for assembly and reinforcement are provided. Is inserted, and the end 101a of the metal ring 101 on the atmosphere O side of the outer peripheral side is mechanically caulked and assembled. Previous sealing device 2
As shown in FIG. 14, a seal ring 202 is attached to an outer peripheral side of an outer peripheral metal ring 201, and a rubber lip 203, a resin seal member 204, a flat washer-shaped metallic ring 205, and a dust lip are provided on the inner peripheral side. 206 was inserted, and the end 201a on the atmosphere side O of the metal ring 201 was mechanically caulked and assembled. The sealing device 100 includes the sealing device 2
Compared with 00, the number of parts was greatly reduced, and the production was simplified and the cost was reduced.

[0004]

However, in terms of process, the process of caulking the outer periphery is complicated and costly, and in addition to the problem of generation of powder or metal powder from the surface film,
There have been problems such as rust generation due to damage of the surface treatment film in terms of product quality, and deterioration of the sealing function due to the adhesion of the powder to the product. Further, since the outer peripheral metal surface is exposed, the housing of the actual machine may be damaged, which may affect the sealing performance.

The present invention has been made in order to solve the problems of the prior art, and an object of the present invention is to provide a high-quality sealing device and a method for manufacturing the sealing device which can be easily manufactured at low cost. To provide.

[0006]

In order to achieve the above object, a first aspect of the present invention provides an outer peripheral portion extending in an axial direction and a flange portion extending in an inner diameter direction from an end of the outer peripheral portion on a fluid side to be sealed. An inner peripheral surface of an outer peripheral portion of the first metal ring, an outer peripheral portion extending in the axial direction, and a flange portion extending in an inner diameter direction from an end of the outer peripheral portion on the fluid side to be sealed. And a base end of a resin ring having a first seal lip made of resin is sandwiched between the flange of the first metal ring and the flange of the second metal ring.
An integrally assembled assembly, at least an outer peripheral covering portion covering an outer peripheral surface of the first metal ring, and a sealing target fluid side covering an end surface of the flange portion of the first metal ring on a sealing target fluid side A cover made of a rubber-like elastic body in which a cover and a second seal lip provided on the fluid side to be sealed of the first seal lip are continuously formed; A sealing device characterized by being integrally held by a part.

[0007] In this case, since the assembly is integrally held by the covering portion, a complicated and costly caulking step is unnecessary in the manufacturing process, and the manufacturing process can be simplified and the cost can be reduced. . Further, since no powder or metal powder is generated from the metal surface treatment film in the caulking process, the quality is improved without powder or the like becoming a foreign substance and adhering to the sealing device and losing the sealing function. In addition, since there is no problem of generation of rust due to breakage of the metal surface treatment film in the caulking step, quality is improved.

[0008] Further, since the covering portion is formed continuously, the flow path of the airtight leak generated when the assembly is assembled is sealed by the covering portion, and the reliability is improved. Further, since the covering portion is formed continuously, it is not necessary to thoroughly control the quality of foreign materials, scratches, molding defects and assembly defects that may impair the airtightness of each member of the assembly. Therefore, the manufacturing process is simplified, and the cost can be reduced.

Further, since the outer peripheral surface of the first metal ring is covered by the outer peripheral covering portion made of a rubber-like elastic body, the outer peripheral metal surface damages the inner peripheral surface of the housing and affects the sealing performance. Without this, the sealing function on the outer peripheral side can be sufficiently ensured, and the functional reliability is improved.

According to a second aspect of the present invention, the resin ring is mounted inside the first metal ring and on a side of the flange portion of the first metal ring opposite to the fluid to be sealed, and the resin inside the first metal ring is provided. The second metal ring is press-fitted on the side of the ring opposite to the fluid to be sealed, and the inner peripheral surface of the outer peripheral portion of the first metal ring is fitted to the outer peripheral surface of the outer peripheral portion of the second metal ring, The assembly is integrally assembled by sandwiching a base end of the resin ring between a flange portion of the first metal ring and a flange portion of the second metal ring, and is disposed in a molding die. A method for manufacturing a sealing device according to the first invention, wherein the covering portion is integrally formed on the assembly by vulcanization molding.

With this configuration, since the assembly is held by the covering portion formed integrally with the assembly,
A complicated and costly caulking process is not required, and the manufacturing process can be simplified and the cost can be reduced. Further, since no powder or metal powder is generated from the metal surface treatment film in the caulking process, the quality is improved without powder or the like becoming a foreign substance and adhering to the sealing device and losing the sealing function. In addition, since there is no problem of generation of rust due to breakage of the metal surface treatment film in the caulking step, quality is improved.

Further, in the process of vulcanization molding, the rubber-like elastic material enters the gaps between the members of the assembly and is filled therein, and the gaps serving as airtight leak passages are sealed, thereby improving reliability. I do. In addition, since the covering portion can be formed continuously, it is not necessary to thoroughly control the quality of foreign materials, scratches, molding defects and assembly defects that may impair the airtightness of each member. Therefore, the manufacturing process is simplified, and the cost can be reduced.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the illustrated embodiment.

(First Embodiment) FIG. 1 is a sectional view showing a schematic configuration of a sealing device 1 according to a first embodiment of the present invention.

Metal ring 2 as first metal ring of sealing device 1
Is a substantially L-shaped cross section, an outer peripheral portion 3 extending in the axial direction, an axial end portion 4 of an outer peripheral portion having a step portion 5 formed by chamfering on an inner peripheral surface side 4, and a fluid O side of the outer peripheral portion 3 to be sealed. Flange portion 6 extending in the inner diameter direction from the end portion Inner peripheral portion 6 formed on the fluid O side to be sealed via a step portion on the inner diameter side of flange portion 6
a.

A metal ring 10 as a second metal ring on the inner peripheral side of the metallic ring 2 has a substantially L-shaped cross section, an outer peripheral portion 11 extending in the axial direction, and an inner peripheral portion extending from the outer peripheral portion side of the fluid O to be sealed. It comprises a flange portion 12 in which a plurality of axial holes 13 are provided.

The inner peripheral surface 7 of the outer peripheral portion 3 of the metal ring 2 and the metal ring 1
The outer peripheral surface 18 of the outer peripheral portion 11 is fitted to the metal ring 2, 10.
Are sandwiched between the flange portions 6, 12. A seal lip portion 17 as a first seal lip portion extending to the fluid side O to be sealed in the axial direction is formed at an inner diameter side end portion of the seal lip support portion 16 to slide and seal with the shaft. here,
The metal ring 2, the metal ring 10, and the seal member 15 constitute an assembly. As the resin, PTFE is desirable in view of properties such as chemical resistance, heat resistance, and low friction coefficient. However, a pure resin or a resin to which various fillers are added according to the properties can be used.

The rubber covering portion 20 is formed by connecting the axial ends 4, 14 of the metal rings 2, 10 on the atmosphere A side from the outer peripheral surface 8 of the outer peripheral portion 3 of the metal ring 2 to the outer peripheral portion 11 of the metal ring 10. Axial end 21 covering up to the inner peripheral side corner, outer peripheral fitting portion 22 as an outer peripheral covering portion covering the entire outer peripheral surface 8 of outer peripheral portion 3 of metal ring 2, fluid to be sealed of flange portion 6 of metal ring 2 A wall portion 23 as a fluid-side coating portion to be sealed, which covers the O-side end surface, a seal lip portion 24 as a second seal lip portion extending to the fluid O to be sealed in the axial direction, a lip tip portion 25 slidably sealed with the shaft, a seal. The joint airtight portion 2 that fills the space between the seal lip support portion 16 of the member 15 and the inner peripheral portion 6a of the flange portion 6 of the metal ring 2.
6 and each part is formed continuously. In the present embodiment, rubber is used as the rubber-like elastic body, but the present invention is not limited to this.

The coating portion 20 is integrally baked on the metal rings 2, 10 and the seal member 15 by vulcanization molding.
The axial end 21 enters the space formed between the step 5 of the outer peripheral portion 3 of the metal ring 2 and the metal ring 10 and holds the ends of the metal ring 2 and the metal ring 10 on the atmosphere A side. The joint airtight portion 26 is inserted between the inner peripheral portion 6a of the metal ring 2 and the seal lip support portion 16 of the seal member 15 to hold the seal lip support portion 16, and forms the continuously formed covering portion 20.
Holds the metal rings 2 and 10 and the seal member 15 integrally. Therefore, since a caulking step is not required, powder and metal powder from the metal surface treatment film are not generated, and the powder is not attached to the sealing device as a foreign substance and the sealing function is not lost, thereby improving the quality. . In addition, since there is no problem of generation of rust due to breakage of the metal surface treatment film in the caulking step, quality is improved.

Since the covering portion 20 is formed continuously, a flow path of airtight leakage generated when the metal ring 2, the metal ring 10 and the sealing member 15 are assembled is sealed by the covering portion 20, so that the reliability is improved. Is improved. Further, since the covering portion 20 is formed continuously with respect to the metal rings 2 and 10 and the seal member 15, quality control of foreign materials, scratches, molding defects and assembly defects that may impair the airtightness of each member is performed. There is no need to be thorough. Therefore, the manufacturing process is simplified, and the cost can be reduced.

The seal lip 17 of the seal member 15
As will be described later, the inner diameter portion 18 of the flat washer-shaped seal member 15 is formed by bending in the same direction as the seal lip portion 24 of the covering portion 20 after vulcanization molding.

FIG. 2 is a cross-sectional view showing a state in which the sealing device 1 is attached to a fixed-side housing.

Outer peripheral fitting portion 22 of covering portion 20 of sealing device 1
Are fitted into the inner peripheral surface 32 of the shaft hole 31 of the housing 30, and the wall portion 23 abuts on the step end surface 33 of the housing 30 and is fixed. A groove 34 is provided in the inner peripheral surface 32 of the shaft hole 31 of the housing 30 on the atmosphere side O of the sealing device 1, and a stop ring 35 for preventing the sealing device 1 from being detached is mounted.

Since the outer peripheral fitting portion 22 that covers the entire outer peripheral surface 8 of the outer peripheral portion 3 of the metal ring 2 is formed, the metal surface damages the inner peripheral surface 32 of the housing 30 and affects the sealing performance. Without any problem, the sealing function on the outer peripheral side can be sufficiently secured,
Functional reliability is improved. A shaft 40 is rotatably inserted concentrically into the inner periphery of the sealing device 1. On the outer peripheral surface 41 of the shaft 40, the lip tip portion 25 of the seal lip portion 24 of the covering portion 20 and the seal lip portion 17 of the seal member 15 are slidably contacted and sealed.

Hereinafter, a method of manufacturing the sealing device 1 will be described.

FIG. 3A shows each member before assembly.
A flat washer-shaped seal member 15 is inserted along the outer peripheral portion 3 to the flange portion 6 side of the metal ring 2, and the seal member 15 is attached to the atmosphere A side of the flange portion 6 of the metal ring 2. Further, the metal ring 10 is press-fitted into the inner diameter side of the metal ring 2, and the inner peripheral surface 7 of the outer peripheral portion 3 of the metal ring 2 and the outer peripheral portion 11 of the metal ring 10
Is fitted with the outer peripheral surface 18. The outer diameter side of the seal member 15 is clamped and integrated between the flange portions 6 and 12 of the two metal rings 2 and 10 so as to be integrated. When assembling,
The step 5 formed on the inner peripheral surface of the axial end 4 of the metal ring 2 serves as a guide when the seal member 15 and the metal ring 10 are inserted.

FIG. 3B shows an assembled state. After assembling, the edge portion 14 of the equally-distributed hole 13 in the flange portion 12 of the metal ring 10 prevents the sealing member 15 from getting into the surface, prevents slippage after assembly and co-rotation with the shaft during operation, and is firmly fixed. Play a role.

The metal rings 2 and 10 are both surface-treated in advance, and the underlayer is subjected to a chemical conversion treatment such as a phosphoric acid film.
The surface is coated with an adhesive such as a resin or rubber paste, which is optimal for rubber, so that a rubber covering portion 20 is formed on the metal rings 2 and 10 by vulcanization molding and strong baking adhesion can be performed. I have to.

As shown in FIG. 4A, two integrated metal rings 2 and 10 and a flat washer-shaped seal member 15 are placed on a first lower die 45. On the upper surface of the first lower mold 45, a protrusion 45a, a seal member holder 45b, a metal ring holder 45 are provided.
c is formed concentrically in a stepwise manner in the outer diameter direction from the center portion, the inner diameter portion 18 of the seal member 15 is held on the seal member holding portion 45b, and the metal ring 10 is held on the metal ring holding portion 45c. The flange portion 12 is held. The outer peripheral portions 3 and 11 of the metal ring 2 and the metal ring 10 are formed by a first lower die 45 and a second lower die 4.
The metal ring 2 is inserted into an annular concave portion 48 formed by the middle die 47, and a space is secured below the axial ends 4 and 14 of the metal rings 2 and 10.

Thereafter, as shown in FIG. 4 (b), an annularly cut rubber cloth 52 is formed on the upper part of the flange 6 of the metal ring 2.
And press it from above with an upper mold (not shown),
Compressed and vulcanized under optimal pressure and temperature conditions, and covered with an axial end 21, an outer peripheral fitting 22, a wall 23, a seal lip 24, a lip tip 25, and a joint airtight part 26. 20 are integrally formed.

In this process, the rubber cloth 52 is formed between the stepped portion 5 of the metal ring 2 and the outer peripheral surface 18 of the metal ring 10 and between the inner peripheral portion 6 of the metal ring 2 and the end face of the sealing member 15 to be sealed. The metal rings 2 and 1 which are filled around the space and serve as airtight leakage passages
Since the gap between the assembly portion of the seal member 15 and the seal member 15 is sealed, the reliability is improved. Further, the covering portion 20 is formed of a metal ring 2,
Since it is formed integrally with the sealing member 10 and the seal member 15, it is not necessary to thoroughly control the quality of foreign matters, scratches, molding defects and assembly defects that may impair the airtightness of each member. Therefore, the manufacturing process is simplified, and the cost can be reduced. Further, the caulking step becomes unnecessary, and no powder or metal powder is generated from the metal surface treatment film, so that the powder or the like does not adhere to the sealing device as a foreign substance and the sealing function is not lost, thereby improving the quality. In addition, since there is no problem of generation of rust due to breakage of the metal surface treatment film in the caulking step, quality is improved. Since the entire outer peripheral surface 8 of the outer peripheral portion 3 of the metal ring 2 is covered with rubber,
The sealing function on the outer peripheral side can be sufficiently ensured without damaging the actual housing and affecting the sealing performance, and the functional reliability is improved.

The compression molding may be performed as described above, and FIG.
As shown in (2), the first upper die 49 and the second upper die 50 may be used for clamping and then injection molding a rubber material from the injection holes 51 equally arranged in the second upper die 50 to produce the second upper die 50.

FIG. 6 shows a sealing device 1 in a semi-finished state immediately after molding.
And the sealing member 15 remains in a flat washer shape,
No bending is performed. FIG. 7 shows a state in which the shaft 55 of the bending jig is inserted into the inner diameter of the sealing member 15 of the sealing device 1 in a semi-finished state, and the sealing lip portion 17 extending to the fluid O to be sealed in the axial direction is formed by bending. Is shown. When a large number of products are arranged in a rod shape on a shaft and heated in an electric furnace for a certain period of time, a stable bending state and dimensions can be obtained with good productivity.

(Second Embodiment) FIG. 8 shows a sealing device 61 according to a second embodiment of the present invention. Cover 20 Seal lip 24 and Seal lip 17 of Seal member 15
Since the configuration is the same as that of the first embodiment except for the configuration of the inner peripheral surface of the first embodiment, portions having the same configuration are denoted by the same reference numerals, and description thereof is omitted.

On the inner peripheral surface 25a of the lip tip portion 25 of the seal lip portion 24 of the covering portion 20 of the sealing device 61, spiral ribs 62 having a substantially triangular cross section are equally arranged in the circumferential direction. By forming a spiral cut-out groove 63 on the inner peripheral surface 17a of the lip portion 17, a screw that gives a hydrodynamically sealing action is added. Therefore,
The sealing performance can be further improved.

(Third Embodiment) FIG. 9 shows a sealing device 71 according to a third embodiment of the present invention. Cover 20 Seal lip 24 and Seal lip 17 of Seal member 15
Since the configuration is the same as that of the first embodiment except for the configuration of the inner peripheral surface of the first embodiment, portions having the same configuration are denoted by the same reference numerals, and description thereof is omitted.

On the inner peripheral surface 25a of the lip tip portion 25 of the sealing lip portion 24 of the covering portion 20 of the sealing device 71, spiral ribs 62 having a substantially triangular cross section are equally arranged in the circumferential direction. On the inner peripheral surface 17a of the lip portion 17, spiral grooves 72 having a V-shaped cross section are equally arranged in the circumferential direction. The sealing performance can be further improved by adding such a screw that provides a sealing action in terms of hydrodynamics.

As shown in FIG. 10, the spiral groove 72 on the inner peripheral surface 17a of the seal lip portion 17 of the seal member 15 forms a projecting screw on the seal member holding portion 45b of the first lower die 45 during vulcanization molding. By transferring this, it can be easily formed.

(Fourth Embodiment) FIG. 11 shows a fourth embodiment of the present invention.
Shows a sealing device 81 according to the embodiment. Sealing portion 1 of coating portion 20 and sealing lip portion 24 and sealing member 15
7 has the same configuration as that of the first embodiment except for the configuration of the inner peripheral surface of the seventh embodiment.

On the inner peripheral surface 25a of the lip tip portion 25 of the seal lip portion 24 of the covering portion 20 of the sealing device 81, a leftward spiral rib 82 and a rightward spiral rib 83 having a substantially triangular cross section are formed. The spiral grooves 84 and 85 having a V-shaped cross section are equally arranged in the circumferential direction on the inner peripheral surface 17a and the outer peripheral surface 17b of the seal lip portion 17 of the seal member 15. The sealing performance can be further improved by adding such a screw that provides a sealing action in terms of hydrodynamics.

(Fifth Embodiment) FIG. 12 shows a fifth embodiment of the present invention.
1 shows a sealing device 91 according to the embodiment. Except for the configuration of the seal lip portion 24 of the covering portion 20, the configuration is the same as that of the first embodiment, and thus the portions having the same configuration are denoted by the same reference numerals and description thereof is omitted.

A circumferential groove 25b is formed on the outer diameter side of the lip tip portion 25 of the seal lip portion 24 of the covering portion 20 of the sealing device 91.
And a spring 92 is mounted in the groove 25b to improve the followability of the lip tip 25 to the shaft. If the followability to the shaft is improved in this way, the sealing performance is also improved.

[0043]

As described above, according to the first aspect, since the assembly is integrally held by the covering portion,
A complicated and costly caulking process is unnecessary in the manufacturing process, and the manufacturing process can be simplified and the cost can be reduced. Further, since no powder or metal powder is generated from the metal surface treatment film in the caulking process, the quality is improved without powder or the like becoming a foreign substance and adhering to the sealing device and losing the sealing function. In addition, since there is no problem of generation of rust due to breakage of the metal surface treatment film in the caulking step, quality is improved.

Further, since the covering portion is formed continuously, the flow path of the airtight leak generated when the assembly is assembled is sealed by the covering portion, and the reliability is improved. Further, since the covering portion is formed continuously, it is not necessary to thoroughly control the quality of foreign materials, scratches, molding defects and assembly defects that may impair the airtightness of each member of the assembly. Therefore, the manufacturing process is simplified, and the cost can be reduced.

Further, since the outer peripheral surface of the first metal ring is covered with the outer peripheral covering portion made of a rubber-like elastic body, the outer peripheral metal surface damages the inner peripheral surface of the housing and affects the sealing performance. Without this, the sealing function on the outer peripheral side can be sufficiently ensured, and the functional reliability is improved.

According to the second aspect of the present invention, the assembly is held by the covering portion formed integrally with the assembly, so that a complicated and costly caulking process is not required, and the manufacturing process can be simplified. The cost can be reduced. Further, since no powder or metal powder is generated from the metal surface treatment film in the caulking process, the quality is improved without powder or the like becoming a foreign substance and adhering to the sealing device and losing the sealing function.
In addition, since there is no problem of generation of rust due to breakage of the metal surface treatment film in the caulking step, quality is improved.

Further, in the process of vulcanization molding, the rubber-like elastic material enters the gaps between the members of the assembly and is filled therein, and the gaps serving as airtight leak passages are sealed, thereby improving reliability. I do. In addition, since the covering portion can be formed continuously, it is not necessary to thoroughly control the quality of foreign materials, scratches, molding defects and assembly defects that may impair the airtightness of each member. Therefore, the manufacturing process is simplified, and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a schematic structure of a sealing device according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing an attached state of the sealing device according to the first embodiment of the present invention.

FIG. 3A is a cross-sectional view showing a state before assembling a metal ring portion of the sealing device according to the first embodiment of the present invention. FIG. 3B is a sectional view showing an assembled state of the metal ring portion.

FIG. 4 is a diagram illustrating a method for manufacturing the sealing device according to the first embodiment of the present invention.

FIG. 5 is a diagram illustrating another method of manufacturing the sealing device according to the first embodiment of the present invention.

FIG. 6 is a half sectional view showing the sealing device according to the first embodiment of the present invention in a semi-finished state.

FIG. 7 is a diagram illustrating a method of processing the sealing device according to the first embodiment of the present invention in a semi-finished state.

FIG. 8 is a half sectional view showing a schematic structure of a sealing device according to a second embodiment of the present invention.

FIG. 9 is a half sectional view showing a schematic structure of a sealing device according to a third embodiment of the present invention.

FIG. 10 is a diagram illustrating a method for manufacturing a sealing device according to a third embodiment of the present invention.

FIG. 11 is a half sectional view showing a schematic structure of a sealing device according to a fourth embodiment of the present invention.

FIG. 12 is a half sectional view showing a schematic structure of a sealing device according to a fifth embodiment of the present invention.

FIG. 13 is a view showing a conventional sealing device.

FIG. 14 is a view showing another conventional sealing device.

[Explanation of symbols]

1, 61, 71, 81, 91, 100, 200 Sealing device 2 Metal ring 3 Outer peripheral portion 5 Step portion 6 Flange portion 7 Inner peripheral surface 8 Outer peripheral surface 10 Metal ring 11 Outer peripheral portion 12 Flange portion 18 Outer peripheral surface 15 Seal member 17 Seal lip part 18 Inner diameter part 20 Coating part 21 Axial end part 22 Outer circumference fitting part 23 Wall part 24 Seal lip part 25 Lip tip part 30 Housing 40 Axis 45 First lower die 46 Second lower die 47 Middle die 49 First upper Mold 50 Second upper mold

Claims (2)

[Claims] 1. An inner peripheral surface of an outer peripheral portion of a first metal ring having an outer peripheral portion extending in an axial direction and a flange portion extending in an inner diameter direction from an end of the outer peripheral portion on a fluid side to be sealed, and extending in an axial direction. The outer peripheral portion and the outer peripheral surface of the outer peripheral portion of the second metal ring having the flange portion extending in the radial direction from the end of the outer peripheral portion on the side of the fluid to be sealed are fitted to each other, and the first seal lip portion made of resin is fitted. An integrally assembled assembly that clamps the base end of the resin ring between the flange portion of the first metal ring and the flange portion of the second metal ring; An outer peripheral coating portion that covers an outer peripheral surface; a sealing target fluid side coating portion that covers an end surface of the flange portion of the first metal ring on a sealing target fluid side; and a sealing target fluid side of the first seal lip portion. Rubber-like bullet formed continuously with the second seal lip Comprising a body made of the covering portion, a sealing device wherein the assembly is characterized in that it is integrally held by the cover portion. 2. The resin ring is assembled inside the first metal ring on the side of the flange portion of the first metal ring opposite to the fluid to be sealed, and the resin ring inside the first metal ring is not sealed. The second metal ring is press-fitted into the target fluid side, and an inner peripheral surface of an outer peripheral portion of the first metal ring is fitted to an outer peripheral surface of an outer peripheral portion of the second metal ring. A base end portion of the resin ring is sandwiched between a flange portion of the second metal ring and a flange portion of the second metal ring, and the assembly is integrally assembled, and the assembly is disposed in a molding die. 2. The method according to claim 1, wherein the coating is integrally formed by vulcanization.