JP2000304026A - Sealing device with falling-off preventive function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealing device capable of certainly preventing a sealing member from falling off without previously applying an adhesive, grease, etc., on a shaft part to armour the sealing member, especially a nozzle part of a fuel injection valve and an outer peripheral part of an injection valve main body. SOLUTION: This is a sealing device 1 furnished with a sealing member 2 interposed between opposed surfaces 61, 31 of two members assembled as a shaft part 7 of the first member is fitted in a shaft hole 5 of the second member and to seal between the both opposed surfaces. In this case, a friction pressure contact part 10 to be made pressure contact with an outer peripheral surface 71 of the shaft part 7 by elastic deformation is integrally formed on at least on a part or all of an inner peripheral surface of the sealing member 2 to be armoured on the shaft part 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing member which is interposed between two opposing surfaces of a first member which are fitted into a shaft hole of a second member and which are combined with each other to seal between the opposing surfaces. The present invention relates to a seal device having a fall-prevention function provided with:

[0002]

2. Description of the Related Art In an in-cylinder direct fuel injection engine, as shown in FIG. 14, a fuel injection valve 100 is fitted into a mounting hole 103 opened in a combustion chamber 102 of a cylinder head 101, and the fuel injection valve 100 It is configured to inject high-pressure fuel directly into the combustion chamber 102.
Unlike the low-pressure type that is mounted on the intake manifold, the fuel injection valve 100 is directly exposed to the combustion gas in the combustion chamber 102, and therefore has strict conditions such as heat resistance, pressure resistance, and vibration resistance. Valve 100 and mounting hole 1
A single or a plurality of seal members having heat resistance and pressure resistance are interposed between the nozzle member 03 and the nozzle portion 104 facing the combustion chamber 102. In particular, the nozzle member 104 having a cross-sectional waveform as a seal member has a spring property in the axial direction. The corrugated washer 105 is used. When assembling the fuel injection valve 100 into the mounting hole 103, the mounting tool 106 is used to mount the fuel injection valve 100 on the mounting flange 107.
Is pressed against the bearing surface of the cylinder head 101 to elastically compress the corrugated washer 105, and the elastic restoring force of the corrugated washer is used to securely seal between the nozzle portion 104 where the high-pressure combustion gas acts and the cylinder head 101. ing.

[0003]

By the way, the procedure of interposing the corrugated washer 105 between the fuel injection valve 100 and the cylinder head 101 is as follows. It is inserted into the mounting hole 103 together with the injection valve 100. When the fuel injection valve 100 is mounted in the mounting hole 103 opening to the combustion chamber, the nozzle 104
Is directed downward, so that the corrugated washer 105 easily falls off from the nozzle portion 104. Therefore, it has conventionally been essential to apply an adhesive having adhesiveness, grease, or the like to the outer peripheral surface of the nozzle portion 104 that covers the corrugated washer 105 in advance. The process of applying these adhesives and grease is very complicated, and particularly when the adhesive is applied, the movement of the corrugated washer during assembling is not smooth, and the workability and the fit of the corrugated washer between the opposing surfaces are reduced. At the same time, the adhesive is only slightly adhered to the seal surface of the washer, so that the sealing property is significantly reduced. In addition, when grease is applied, although the influence on the sealability is small, the temperature condition for maintaining the adhesion state is severe, and the corrugated washer is easily dropped off by applying vibration, which is very unstable. Met.

The present invention has been made in view of such a situation, and includes a step of applying an adhesive, grease, or the like in advance to a shaft portion that covers a sealing member such as a corrugated washer, particularly, an outer peripheral portion of a nozzle portion or the like of a fuel injection valve. It is an object of the present invention to provide a sealing device that can reliably prevent the sealing member from falling off while omitting it.

[0005]

Means for Solving the Problems The inventor of the present invention has made intensive studies to solve the above-mentioned problems, and as a result, by adding a function of being pressed against the outer peripheral surface of the shaft portion with respect to the sealing member, It has been found that the sealing member can be prevented from falling off without applying an adhesive or grease to the outer peripheral surface of the shaft portion, and the present invention has been completed.

That is, according to the present invention, the shaft portion of the first member is
A sealing device provided with a seal member interposed between two opposing surfaces of two members fitted and combined in a shaft hole of the member, and sealing between the two opposing surfaces. Provided is a sealing device with a falling-off preventing function, in which at least a part or the whole of an inner peripheral surface is integrally formed with a friction pressure contact portion pressed against an outer peripheral surface of a shaft portion by elastic deformation. Here, integrally forming the friction welding portion means that, besides forming the friction welding portion on the sealing member, the friction welding portion formed as a separate member as the friction welding portion can be adhered to the sealing member or can be detachably attached. , Which means to operate integrally with the seal member. Such a sealing device is pressure-bonded to the outer peripheral surface of the shaft portion via the friction welding portion, and is reliably prevented from falling without applying an adhesive, grease, or the like to the shaft portion in advance. At the time of assembly, it is inserted into the shaft hole with a force larger than the frictional resistance between the friction welding part and the shaft part, moves in the axial direction on the outer peripheral surface of the shaft part, and moves to the appropriate position on the shaft part I do.

Here, in a sealing device using a corrugated washer as the sealing member and projecting a friction pressure contact portion toward the inner space side of the corrugated washer, the sealing member at both ends of the corrugated washer and the two members are provided. Since no friction welding portion is interposed therebetween, the corrugated washer is pressed against the shaft while maintaining good sealing performance of the sealing surface.

The present invention further includes a seal member interposed between the opposing surfaces of the two members, the shaft of the first member being fitted into the shaft hole of the second member, and sealing between the opposing surfaces. A sealing device which is formed separately from a sealing member provided on the shaft portion, and provided with a falling-off preventing member provided on the shaft member at a position on the tip side with respect to the sealing member, wherein the falling-off preventing member is provided. The present invention also provides a sealing device with a falling-off prevention function, in which at least a part or the whole of the inner peripheral surface is integrally formed with a friction pressure contact portion which presses against the outer peripheral surface of the shaft portion by elastic deformation. In this way, by pressing the falling-off preventing member formed separately from the sealing member against the distal end of the shaft, the movement of the sealing member toward the distal end of the shaft is stopped, and the sealing member is moved relative to the shaft. And at the time of assembling the two members, by being inserted into the shaft hole with a force greater than the frictional resistance between the friction welding portion of the fall prevention member and the shaft portion, the outer periphery of the shaft portion It moves on the surface in the axial direction, and moves to the appropriate position of the shaft.

Here, a sheet-shaped member is used as the falling-off prevention member, and a friction pressure contact portion which protrudes inward is formed on the inner periphery thereof, or a plurality of cuts are similarly formed on the inner periphery of the sheet-like member. In the case where the friction-welded portion is formed, the sheet-shaped stopper member is pressed against the shaft portion to prevent the seal member from falling off as described above.

Further, if the falling-off preventing member is bonded to and integrated with the sealing member, the sealing device can be easily mounted on the shaft.

By the way, such a falling-off prevention member is mounted at a position on the tip side of the shaft portion with respect to the sealing member.
There is a possibility that the falling-off preventing member has a bad effect on the sealing performance between the sealing member and the second member. However, a corrugated washer was used as the sealing member, and the falling-off preventing member was arranged in the internal space of the corrugated washer. In this, the sealing property is maintained as it is without interposition of a falling-off preventing member between the sealing surfaces on both surfaces of the corrugated washer and the two members, and the falling-off preventing member seals between the sealing member and the second member. If so, there is no problem in the above-mentioned sealing performance, and the sealing performance can be further improved.

[0012] The above-described sealing device comprises a fuel injection valve of an engine as a first member and a second fuel injection valve for assembling the fuel injection valve.
By being interposed between the mounting hole of the cylinder head as a member, when the fuel injection valve is assembled to the mounting hole, a complicated process of applying an adhesive, grease, or the like to the fuel injection valve in advance is omitted. Of the sealing device is reliably prevented, and the efficiency of the assembling operation is significantly improved.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The seal device according to the present invention includes a seal member that is interposed between the opposing surfaces of the two members that are combined by fitting the shaft of the first member into the shaft hole of the second member, and seals between the opposing surfaces. A sealing device, which adds a function of being pressed against the outer peripheral surface of a shaft portion with respect to the seal member, without applying an adhesive or grease to the shaft portion in advance, when assembling the member, The gist of the present invention is to secure the exterior sealing member by frictional engagement without falling off from the shaft portion, and to securely hold the sealing member. In the following embodiments, a fuel injection valve of an in-cylinder fuel direct injection engine is used as the first member, a nozzle portion of the fuel injection valve is used as a shaft, a cylinder head of the engine is used as a second member, and a shaft hole is used as a shaft member. Nozzle holes of mounting holes provided in the cylinder head,
An example in which a corrugated washer interposed between the fuel injection valve and the cylinder head is applied as a seal member will be described, but the present invention is not limited to this application example.

FIGS. 1 to 6 show a first embodiment of the present invention, and FIGS.
10 to 13 show a second embodiment, and FIGS. 11 to 13 show a third embodiment. In the drawings, reference numeral 1 denotes a sealing device, and reference numeral 2 denotes a corrugated washer.

First, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an overall configuration diagram showing a state in which an electromagnetic fuel injection valve 6 is assembled to a mounting hole 5 opening to a combustion chamber 4 in a cylinder head 3. A sealing device 1 for sealing the space between the fuel injection valve 6 and the cylinder head 3 in an airtight manner is provided. The sealing device 1 includes a corrugated washer 2 having a sealing surface on both upper and lower surfaces. The corrugated washer 2 has a mounting flange 9 abutting on the cylinder head 3 by a pressing force of a mounting tool 8 when the fuel injection valve 6 is mounted. The cylinder head 3 is securely sealed between the fuel injection valve 6 and the cylinder head 3 on which high-pressure combustion gas acts due to the elastic restoring force against the compression.

FIGS. 2A and 2B are explanatory views showing a state where the sealing device 1 is mounted on the nozzle portion 7 of the fuel injection valve 6, and FIG. 3 is a plan view of the sealing device 1. That is, the sealing device 1 includes the fuel injection valve 6 and the cylinder in the in-cylinder direct fuel injection engine in which the nozzle portion 7 of the fuel injection valve 6 is fitted and combined with the nozzle hole 51 of the mounting hole 5 of the cylinder head 3. The corrugated washer 2 is interposed between the seating surfaces 61 and 31 of the head 3 and seals between the opposing surfaces. At least a part or the entire inner peripheral surface 21 of the corrugated washer 2 is provided with a nozzle portion by elastic deformation. Friction welded part 1 pressed against outer peripheral surface 71 of
0 are integrally formed. Then, as shown in FIG. 2A, the friction pressure contact portion 10 is pressed and locked to the outer peripheral surface 71 via the friction pressure contact surface 10a, so that an adhesive or grease is applied to the nozzle portion 7. Even if this is not done, the corrugated washer 2 is stably held on the outer peripheral surface 71, and even in an automated assembly process by a robot, the corrugated washer 2 is reliably prevented from falling off from the nozzle portion 7.

The friction welding portion 10 projects into the internal space 22 of the corrugated washer 2 and is formed between the sealing surfaces 23 and 24 at both ends of the corrugated washer 2 and the seat surface 61 and the cylinder head seat surface 31 of the fuel injection valve. In between, Figure 2
As shown in (b), the friction pressure contact portion 10 does not intervene, and therefore, the corrugated washer 2 and the seat surface 6
The sealing property between 1 and 31 is well maintained.

Hereinafter, the sealing device 1 will be described in more detail. The seal device 1 according to the present embodiment includes a corrugated washer 2 and a friction pressure contact portion 10 protruding from an inner peripheral lower edge portion 25 facing the internal space 22 and pressed against the nozzle portion 7. The corrugated washer 2 has a corrugated cross section or a step-like elastically deforming portion having a step in the axial direction, and is made of a metal member having sealing surfaces 23 and 24 on both upper and lower surfaces. The part 10 is made of an elastic body such as synthetic rubber integrally formed on the inner peripheral lower edge part 25 by coating, or a viscoelastic material obtained by adding a hardener, a tackifier and the like to a base material such as polyethylene gel or silicon gel. It consists of a body. The inner diameter of the friction welding portion 10 is set substantially equal to or less than the outer diameter 7D of the nozzle portion 7, and is pressed against the outer peripheral surface 71 by elastic restoring force or viscosity. Incidentally, the friction welding portion 10 is formed so as to protrude over the entire circumference of the corrugated washer 2 as shown in FIG. 3, but other than that, for example, as shown in FIG.
It is also preferable that a plurality of protrusions 11 are formed so as to be pressed against the surface. However, in this case, in order to maintain the strength of the entire friction welding portion 10, it is preferable that the base end sides of the plurality of protrusions 11 are formed continuously over the entire circumference.

In the case where the friction welding portion 10 made of the elastic body or the viscoelastic body has a sealing property capable of withstanding high temperature and high pressure, for example, as shown in FIGS. It is preferable that the friction welding portion 10 is coated on the entire surface of the corrugated washer 2 or that the friction welding portion 10 is coated so as to surround the entire inner peripheral surface 21 of the corrugated washer 2 as shown in FIGS. 6 (a) and 6 (b). Is formed by detachably attaching a separately formed friction welding portion to the inner peripheral surface so as to surround the entire inner peripheral surface, or by bonding the separately molded friction welding portion to the inner peripheral surface with an adhesive. What is obtained is also preferable.

Next, a second embodiment of the present invention will be described with reference to FIGS.
Description will be made based on 0. Sealing device 1A of the present embodiment
In the in-cylinder direct fuel injection engine in which the nozzle portion 7 of the fuel injection valve 6 is fitted into the nozzle hole 51 of the mounting hole 5 of the cylinder head 3 and combined, the distance between the opposed surfaces of the fuel injection valve 6 and the cylinder head 3 That is, the corrugated washer 2 is interposed between the seating surfaces 61 and 31 and seals between the two seating surfaces. The corrugated washer 2 is formed separately from the corrugated washer 2 provided on the nozzle portion 7 and is formed separately. 2 is provided with a falling-off preventing member 12A which is provided at a position on the tip side of the nozzle portion 7;
At least a part or the whole of the inner peripheral surface 13 of the 2A is integrally formed with a friction pressure contact portion 14 which is pressed against the outer peripheral surface 71 of the nozzle by elastic deformation. Then, as shown in FIG. 7 (a), the stopper member 12A is crimped to the tip end side of the corrugated washer 2 in the nozzle portion 7, so that the corrugated washer 2 is stopped from moving in the tip end direction of the shaft portion. Thus, the nozzle portion 7 is stably held without dropping on the outer peripheral surface 71 of the nozzle portion 7.

The falling-off preventing member 12A, which is formed separately,
The outer diameter and the thickness of the corrugated washer 2 are appropriately set at least for the purpose of being disposed in the internal space 22 of the corrugated washer 2. The drop-off preventing member 12A does not intervene between the seating surface 61 and the cylinder head seating surface 31, and as shown in FIG. 7 (b), the sealability between the two members by the corrugated washer 2 is maintained well. You.

The sealing device 1A of this embodiment comprises a corrugated washer 2 and a falling-off preventing member 12A separate from the washer. The falling-off preventing member 12A is made of, for example, a paper material as shown in FIG. A friction pressure contact portion 14 having a plurality of protrusions 15a protruding inward is formed at regular intervals along a circumferential direction in an inner peripheral portion of the sheet-like member. The material and paper thickness of the falling-off prevention member 12A, the projection size of the projection 15a, etc.
4, a minimum inner diameter 12d connecting the tops of the projections 15a is appropriately set so as to obtain a sufficient pressure contact strength for preventing the corrugated washer from falling off.
The diameter is appropriately set to a value substantially equal to or less than the outer diameter 7D of the nozzle portion 7 based on the protrusion dimension of the nozzle portion 7 or the like. For example, if the paper thickness is 0.
A drop-out preventing member having a projection diameter of 0.05 to 0.5 mm and a protrusion having an outer diameter 7D of 7.0 to 8.0 mm. Exterior,
When supporting a corrugated washer having a mass of 400 mg in a substantially vertical direction, the inner diameter 12 d is preferably 7 mm.
The diameter can be set to a value reduced by 0.2 mm or less from D, more preferably to a value reduced by 0.1 mm or less. Aramid paper, carbon paper, glass fiber-containing paper, or the like is suitably used as the paper material forming the falling-off preventing member 12A, and it is preferable to use aramid paper from the viewpoint of heat resistance. Further, instead of using a paper material, the sheet-like member may be formed using a synthetic resin, a synthetic rubber, a metal material, or the like.

Further, the friction pressure contact portion 14 is not limited to the one provided with the plurality of protrusions 15a as described above, but may extend in the circumferential direction of the inner peripheral portion of the falling-off preventing member 12A as shown in FIG. Multiple cuts 1 at regular intervals along
5b is also a preferred embodiment. In this case, the inner diameter 12d of the falling-off prevention member 12A is appropriately set to a value substantially equal to or less than the outer diameter 7D of the nozzle portion 7 based on the paper thickness, the cutting depth, and the like.
A drop-off preventing member having a depth of 0.1 to 1.0 mm and a depth of each cut 15b provided at 10 or more of 1.0 mm is provided on a nozzle having an outer diameter 7D of 7.0 to 8.0 mm, and has a mass of about 4
When supporting a 00 mg corrugated washer in a substantially vertical direction, the inner diameter 12d is preferably a value smaller than the 7D by 0.2 mm or less, more preferably 0.1 m.
It can be set to a value reduced in diameter by m or less.

The above-mentioned falling-off preventing member 12A is formed separately from the corrugated washer 2, but as another example, as shown in FIG. In order to do this, the bonding means 1 such as an adhesive
6 to remove the fall-off prevention member 12A from the corrugated washer 2
The one bonded to the contact portion 17 is also preferable. Here, as another mode of the bonding means, for example, a press-bonding method or an embedded type in which the falling-off preventing member is partially embedded with an adhesive material may be used.

Next, a third embodiment of the present invention will be described with reference to FIGS. Sealing device 1B of the present embodiment
Is composed of a corrugated washer 2 having sealing surfaces on both upper and lower surfaces, and a separate falling-off preventing member 12B for stopping the same, as in the second embodiment.
The outer diameter of 2B is set to be substantially equal to or larger than that of the corrugated washer 2, and at least the lower surface thereof has a sealing surface 19 for hermetically sealing the gap with the cylinder head seating surface 31.
Are formed. Specifically, as shown in FIG. 12, the drop-off preventing member 12B has a flat metal washer 20 loosely fitted to the nozzle portion 7 and a synthetic rubber layer 26 covering the lower surface and the inner peripheral surface thereof. The synthetic rubber layer 2
6, the seal surface 19 and the friction pressure contact portion 27 are formed. As described above, since the sealing surface 19 is made of an elastic body or a viscoelastic body that can be elastically deformed, the sealing surface 19 is effective as a measure against a cavity in the cylinder head seat surface 31, while the inner diameter 27d of the friction welding portion 27 is As in the case of the first embodiment described above, the outer diameter 7D of the nozzle portion is set to a value substantially equal to or less than the outer diameter 7D, and the elastic member or the viscoelastic member or the like has an elastic restoring force or an adhesive force. It is crimped to the outer peripheral surface 71. Further, as shown in FIG. 12A, a plurality of protrusions 28 are formed on the inner peripheral portion of the washer 20 to increase the adhesion strength between the washer and the synthetic rubber layer 26.

Here, as shown in FIG. 13, the use of the falling-off preventing member 12B in which the synthetic rubber layer 26 also covers the upper surface of the metal washer 20 makes it unnecessary to form a sealing surface on the lower surface of the corrugated washer 2. In addition, manufacturing costs can be significantly reduced.

For the same purpose, instead of the above-mentioned falling-off preventing member 12B, a base material in which a plurality of metal sheets are stacked as a core material and coated with synthetic resin or lead, or an aromatic polyamide fiber and synthetic resin are used. In addition, a material obtained by forming an expanded graphite into a sheet shape or the like and having at least the inner peripheral surface of the core material covered with an elastic material such as synthetic rubber or a viscoelastic material can be suitably used.

With the use of the sealing device 1 of the present invention as described above, the nozzle 7 having the corrugated washer 2 can be removed while eliminating the complicated steps of applying an adhesive, grease or the like to the nozzle 7 in advance. The corrugated washer 2 is reliably prevented from falling off when the cylinder head 3 is mounted on the mounting hole 5, and the efficiency of the mounting operation is significantly improved.

[0029]

According to the present invention described above, the following effects can be obtained.

That is, the shaft portion of the first member is interposed between the opposing surfaces of the two members fitted and combined with the shaft hole of the second member,
A seal device provided with a seal member for sealing between both opposing surfaces, wherein at least a part or all of an inner peripheral surface of a seal member provided on the shaft portion is pressed against an outer peripheral surface of the shaft portion by elastic deformation. According to the sealing device with a falling-off preventing function integrally formed with the friction pressure contact portion, the falling-off of the sealing device can be reliably prevented without applying an adhesive, grease, or the like to the shaft portion in advance. When assembling the members, the shaft is moved in the axial direction on the outer peripheral surface of the shaft by inserting it into the shaft hole with a force greater than the frictional resistance between the friction welding part and the shaft, so that it can be smoothly moved to the proper position of the shaft Can be moved.

According to the sealing device using a corrugated washer as a sealing member and projecting a friction pressure contact portion toward the inner space side of the corrugated washer, the friction pressure contact portion is provided between the sealing surfaces at both ends of the corrugated washer and the two members. Since the corrugated washer does not intervene, the corrugated washer can be pressure-bonded to the shaft while maintaining the sealing property.

[0032] A sealing device comprising a seal member interposed between the opposing surfaces of the two members, the shaft of the first member being fitted into the shaft hole of the second member and being combined, and sealing between the opposing surfaces. A sealing member provided separately from the seal member provided on the shaft portion, and a falling-off prevention member provided on the shaft member at a position on the tip end side of the sealing member; and at least an inner peripheral surface of the falling-off prevention member. According to the sealing device with a drop-preventing function in which a part or the whole thereof is integrally formed with a friction pressure contact portion that presses against the outer peripheral surface of the shaft portion by elastic deformation, the drop-preventing member directs the tip of the shaft portion of the seal member. , The seal member can be undetachably supported on the shaft portion, and can be moved in the axial direction on the outer peripheral surface of the shaft portion to smoothly move to an appropriate position of the shaft portion.

[0033] A sheet-like member is used as a fall-preventing member, and a friction-welding portion protruding inward is formed on the inner periphery thereof, or a friction-welding member having a plurality of cuts formed in the inner periphery of the sheet-like member. In the case where the sealing member is formed, the sealing member can be prevented from falling off by pressing the stopper member made of a sheet-like member against the shaft portion.

If the falling-off preventing member is bonded to and integrated with the sealing member, the sealing device can be easily assembled to the shaft.

According to the sealing device in which the corrugated washer is used as the sealing member and the falling-off preventing member is arranged in the internal space of the corrugated washer, the falling-off preventing member is provided between the sealing surfaces at both ends of the corrugated washer and the two members. Does not intervene, the corrugated washer and the second
It is possible to maintain the sealing property with the member.

When the falling-off prevention member seals between the sealing member and the second member, the sealing performance can be further improved.

If the above sealing device is used as a sealing member interposed between a fuel injection valve of an engine and a mounting hole opened in a combustion chamber, an adhesive or grease is applied to the fuel injection valve in advance. While omitting complicated steps such as
When the fuel injection valve equipped with the sealing device is mounted on the mounting hole, the sealing device can be reliably prevented from falling off, and the efficiency of the mounting operation is significantly improved.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing a state in which a seal device according to the present invention is interposed between a fuel injection valve of an engine and a cylinder head.

FIG. 2A is an explanatory view showing a state in which the sealing device according to the first embodiment of the present invention is externally mounted on a nozzle portion at a tip end of a fuel injection valve. (B) is an explanatory view showing a state where the sealing device according to the first embodiment is interposed between the fuel injection valve and the cylinder head.

FIG. 3 is an explanatory view showing a sealing device according to the first embodiment.

FIG. 4 is an explanatory view showing a modified example of the sealing device according to the first embodiment.

FIG. 5A is a plan view showing another modification of the sealing device according to the first embodiment. (B) is sectional drawing similarly.

FIG. 6A is a plan view illustrating still another modified example of the sealing device according to the first embodiment. (B) is sectional drawing similarly.

FIG. 7A is an explanatory view showing a state in which a sealing device according to a second embodiment of the present invention is externally mounted on a nozzle portion at a tip end of a fuel injection valve. (B) is an explanatory view showing a state in which the sealing device according to the second embodiment is interposed between a fuel injection valve and a cylinder head.

FIG. 8 is an explanatory view showing a falling-off prevention member in the sealing device according to the second embodiment.

FIG. 9 is an explanatory view showing a modified example of the drop-off preventing member.

FIG. 10 is an explanatory view showing a modified example of the sealing device according to the second embodiment.

FIG. 11 is an explanatory view showing a state in which a seal device according to a third embodiment of the present invention is provided on a nozzle portion at a tip end of a fuel injection valve.

FIG. 12A is a plan view showing a falling-off preventing member in a sealing device according to a third embodiment. (B) is sectional drawing similarly.

FIG. 13 is an explanatory view showing a modification of the sealing device according to the third embodiment.

FIG. 14 is an explanatory view showing an assembly structure of a fuel injection valve in a fuel injection engine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1A, 1B Sealing device 2 Corrugated washer 3 Cylinder head 4 Combustion chamber 5 Mounting hole 6 Fuel injection valve 7 Nozzle part 7D Outer diameter 8 Mounting tool 9 Mounting flange 10 Friction pressure contact part 10a Friction pressure contact face 10d Inner diameter 11 Projection part 12A 12B Drop-off prevention member 12d Inner diameter 13 Inner peripheral surface 14 Friction contact portion 15a Projection 15b Cut 16 Adhesion means 17 Contact portion 18 Seal surface 19 Seal surface 20 Washer 21 Inner peripheral surface 22 Internal space 23 Seal surface 24 Seal surface 25 Inner periphery Edge 26 Synthetic rubber layer 27 Friction pressure contact portion 27a Friction pressure contact surface 27d Inner diameter 28 Projection 31 Seat surface 51 Nozzle hole 61 Seat surface 71 Outer peripheral surface 100 Fuel injection valve 101 Cylinder head 102 Combustion chamber 103 Mounting hole 104 Nozzle portion 105 Corrugate washer 106 Mounting fixture 107 Flange

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Takeshi Harada 2-6-5, Nobori, Toyonaka-shi, Osaka F-term (reference) in Domestic Products Dept. Industry Co., Ltd. 3G066 AA02 AB02 AD12 BA00 BA31 BA56 BA65 CC01 CD04 CD10 3J034 AA04 BA06 BD02 BD04 CA01 3J040 AA01 EA01 FA06 FA11 FA13

Claims (9)

[Claims] 1. A sealing device comprising a seal member interposed between two opposing surfaces of a shaft member of a first member fitted into a shaft hole of a second member and combined to seal between the opposing surfaces. Wherein at least a part or the whole of the inner peripheral surface of the seal member provided on the shaft portion is integrally formed with a friction pressure contact portion pressed against the outer peripheral surface of the shaft portion by elastic deformation. Sealing device with function. 2. The seal device with a fall-off preventing function according to claim 1, wherein a corrugated washer is used as the seal member, and a friction welding portion projects toward the inner space of the corrugated washer. 3. A sealing device comprising a seal member interposed between two opposing surfaces of a shaft member of a first member fitted and combined with a shaft hole of a second member to seal between the opposing surfaces. And a detachment prevention member which is formed separately from the seal member provided on the shaft portion and which is provided at a position on the tip end side of the shaft portion with respect to the seal member, wherein at least an inner peripheral surface of the dropout prevention member is provided. A sealing device with a falling-off prevention function, in which a part or the entirety of the shaft is integrally formed with a friction pressure contact portion that presses against the outer peripheral surface of the shaft portion by elastic deformation. 4. The sealing device with a falling-off preventing function according to claim 3, wherein a sheet-like member is used as the falling-off preventing member, and a friction pressure contact portion is formed on an inner peripheral portion of the member so as to protrude inward. 5. The sealing device with a falling-off preventing function according to claim 3, wherein a sheet-like member is used as the falling-off preventing member, and a friction pressure contact portion having a plurality of cuts is formed on an inner peripheral portion of the member. 6. The sealing device with a falling-off preventing function according to claim 3, wherein the falling-off preventing member is adhered to a sealing member. 7. The seal device with a fall-off preventing function according to claim 3, wherein a corrugated washer is used as a seal member, and a fall-off preventing member is arranged in an internal space of the corrugated washer. 8. The sealing device with a drop-off prevention function according to claim 3, wherein a gap between the seal member and the second member is sealed by a drop-off prevention member. 9. A fuel injection valve for an engine as a first member and a mounting hole for a cylinder head as a second member for assembling the fuel injection valve, which are interposed between opposed surfaces of the two members. The sealing device with a fall prevention function according to any one of the above.