JPH09324896A - Oil seal device for injection pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent lowering of sealed properties and the displacement of a device by arranging a cylindrical metallic plug pressure-fitted to a passing hole and a cylindrical rubber part which is integrally mounted around the end of the cylindrical metallic plug and tightly stuck to the peripheral surface of an injection pipe. SOLUTION: A device 5 is formed of a cylindrical metallic plug part 13 and a cylindrical rubber part 14 integrally mounted around the end of the cylindrical metallic plug part 13. The mounting of the rubber part 14 for the end of the metallic plug part 13 is carried out by vulcanization and welding, and also a fastening seal spring 8 to an injection pipe 2 is mounted in the periphery of the end of the rubber part 14. Therefore, the mounting of the device 5 in a passing hole 4 is carried out by not being pushed by hands, but carried out by pressure-fitting the metallic plug 13 to the passing hole 4, and metals are mutually contacted. Thus, sealed properties may not be lowered by forming a clearance between the passing hole 4 and the metallic plug 13 even though they are used for a long time, and such fear may not also occur that the device 5 is displaced from the passing hole 4 by the vibration of an engine and so on.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil seal device for an injection pipe.

[0002]

2. Description of the Related Art Generally, in the case of a diesel engine mounted on a vehicle such as a truck, an injection pipe 2 connected to an injection nozzle 1 has a through hole 4 formed in a cylinder head cover 3 as shown in FIG. The cylinder head cover 3 between the through hole 4 and the injection pipe 2.
An oil seal device 5 is provided for preventing oil from leaking to the outside.

The oil seal device 5 uses the metal cylinder 6 as a core material by vulcanizing and welding the rubber 7 around the metal cylinder 6 made of metal such as iron. A cylindrical body is formed so as to be covered, and a seal spring 8 for tightening the injection pipe 2 is attached to the outer periphery of the tip portion formed of the rubber 7 of the cylindrical body.

[0004]

However, in the case of the conventional oil seal device 5 as shown in FIG. 5, the attachment to the through hole 4 is not press-fitting, but is simply pushed by a worker. In addition, since the rubber 7 covering the outer peripheral surface of the metal cylinder 6 is in contact with the through hole 4, if the contact portion of the rubber 7 with respect to the through hole 4 becomes depressed due to long-term use, the through hole 4 There is a possibility that a gap may be generated between the rubber 7 and the rubber 7 and the sealing performance may deteriorate, and the oil seal device 5 may be displaced with respect to the through hole 4 due to engine vibration or the like.

On the other hand, as shown in FIG. 6, the rubber 7 is vulcanized and welded to the metal flange 9, and the tubular portion made of the flange 10 and the rubber 7 integrally extending from the flange 10. There is also an oil seal device 5 in which the flange portion 10 is fixed to the cylinder head cover 3 with bolts 12.

An oil seal device 5 as shown in FIG.
In this case, since the flange portion 10 is fixed to the cylinder head cover 3 by the bolts 12 as described above, deterioration of the sealing property and displacement of the rubber 7 due to the settling of the rubber 7 like the oil seal device 5 shown in FIG. On the other hand, there is no concern, but the shape of each engine is different, and it is necessary to make a dedicated mold each time.

In view of the above situation, the present invention is to provide an oil seal device for an injection pipe, which can prevent the deterioration of the sealing property and the positional deviation due to the fatigue of the rubber, and can suppress the cost increase. .

[0008]

SUMMARY OF THE INVENTION The present invention relates to an oil seal device for an injection pipe, which is interposed between a through hole formed in a cylinder head cover and an injection pipe penetrating the through hole. Oil for injection pipe, comprising: a cylindrical metal plug part press-fitted into the pipe; and a cylindrical rubber part that is integrally attached to the tip of the metal plug part and that adheres closely to the outer peripheral surface of the injection pipe. It relates to the sealing device.

Further, in the oil seal device for an injection pipe, a flange portion extending toward the outer peripheral side is formed at the base end portion of the metal plug portion, and the flange portion has a through hole on the outer surface of the cylinder head cover. It is effective to attach a seal rubber that adheres closely to the outer peripheral edge.

According to the above means, the following effects can be obtained.

The oil seal device is mounted in the through hole by pressing the metal plug portion into the through hole instead of simply pushing it by an operator, and the metal contacts each other. , Even if it is used for a long period of time, a gap will not be created between the through hole and the metal plug portion and the sealing performance will not be deteriorated. There is no risk of misalignment.

On the other hand, even if the type of engine is changed, the shape of the oil seal device is substantially the same, it has a certain degree of versatility, and there is no need to make a dedicated mold each time.

Further, in the oil seal device for an injection pipe, a flange portion extending toward the outer peripheral side is formed at the base end portion of the metal plug portion, and the flange portion is provided with a through hole outside the cylinder head cover. When a seal rubber that adheres closely to the peripheral edge is attached, in addition to the contact between the metal on the outer peripheral surface of the metal plug that is press-fitted into the through hole, the seal rubber also adheres to the outer peripheral edge of the through hole on the outer surface of the cylinder head cover. The sealing property is further improved due to the shape.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an example of an embodiment for carrying out the present invention. In the figure, the parts designated by the same reference numerals as those in FIG. 5 represent the same parts, and the basic structure thereof is the same as that of the prior art shown in FIG. However, as shown in FIG. 1, a cylindrical metal plug portion 13 that is press-fitted into the through hole 4 is the same as the above.
The oil seal device 5 is composed of the cylindrical rubber portion 14 that is integrally attached to the tip of the metal plug portion 13 and is in close contact with the outer peripheral surface of the injection pipe 2.

The rubber portion 14 is attached to the tip portion of the metal plug portion 13 by vulcanization welding of rubber, and the outer periphery of the tip portion of the rubber portion 14 is used for tightening the injection pipe 2. A seal spring 8 is attached.

Since the oil seal device 5 is configured as described above, the oil seal device 5 is mounted in the through hole 4 by pressing the metal plug portion 13 into the through hole 4 instead of simply pushing it by a worker. Since the metals are in contact with each other, the through hole 4
There is no possibility that a gap is created between the metal plug portion 13 and the metal plug portion 13 and the sealing performance is not deteriorated, and the oil seal device 5 may be displaced relative to the through hole 4 due to engine vibration or the like. Nor.

On the other hand, even if the type of engine is changed, the shape of the oil seal device 5 is substantially the same, it has a certain degree of versatility, and there is no need to make a dedicated mold each time, so there is no concern about cost increase.

In this way, it is possible to prevent the deterioration of the sealing property and the positional deviation due to the fatigue of the rubber, and to suppress the cost increase.

FIG. 2 shows another example of the embodiment of the present invention. In the figure, the parts denoted by the same reference numerals as those in FIG. 1 represent the same parts, and the holes of the cylinder block of the engine are closed. A metal plug portion 13 is formed by forming a hole 15 in an existing plug (so-called U-plug) having a substantially U-shaped cross section, and a rubber portion 14 is formed at the tip of the metal plug portion 13. It is one that is attached.

In the example shown in FIG. 2, similar to the example shown in FIG. 1, there is no fear of deterioration of the sealing property or displacement, and there is some versatility, and the metal plug portion 13 is provided.
Since it can be manufactured using existing parts, it is more advantageous in terms of cost.

In this way, also in the case of the example shown in FIG. 2, it is possible to prevent the deterioration of the sealing property and the displacement due to the fatigue of rubber,
In addition, cost increase can be suppressed.

FIGS. 3 and 4 show still another example of the embodiment of the present invention. In the drawings, the parts denoted by the same reference numerals as those in FIG. A flange portion 16 extending toward the outer peripheral side is formed at the base end portion, and the cylinder head cover 3 is formed on the flange portion 16.
Seal rubber 17 that closely adheres to the outer peripheral edge of the through hole 4 on the outer surface
Is attached.

As shown in FIG. 4, a plurality of (three in the illustrated example) protrusions are provided on the surface of the seal rubber 17 in order to improve the adhesion of the outer surface of the cylinder head cover 3 to the outer peripheral edge of the through hole 4. The line 17a is formed.

In the example shown in FIGS. 3 and 4, in addition to the seal by the metal contact on the outer peripheral surface of the metal plug portion 13 press-fitted into the through hole 4, the seal rubber 1
Since 7 is brought into close contact with the outer peripheral edge portion of the through hole 4 on the outer surface of the cylinder head cover 3, the sealing performance is further improved, but like the example shown in FIG. It is versatile and you do not have to make a dedicated mold each time, so there is no need to worry about cost increase.

In this way, also in the case of the examples shown in FIGS. 3 and 4, it is possible to prevent the deterioration of the sealing property and the positional deviation due to the rubber settling, and it is possible to suppress the cost increase.

The oil seal device for an injection pipe according to the present invention is not limited to the above illustrated example, and various modifications can be made without departing from the scope of the present invention.

[0028]

As described above, according to the oil seal device for an injection pipe of the present invention, it is possible to prevent the deterioration of the sealing property and the displacement due to the fatigue of the rubber, and to suppress the cost increase. It can be effective.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main part of an example of an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part of another example of the embodiment for carrying out the present invention.

FIG. 3 is a sectional view of a main part of still another example of the embodiment according to the present invention.

FIG. 4 is an enlarged view of a portion IV in FIG.

FIG. 5 is a sectional view of a main part of a conventional example.

FIG. 6 is a sectional view of a main part of another conventional example.

[Explanation of symbols]

 2 Injection pipe 3 Cylinder head cover 4 Through hole 5 Oil seal device 13 Metal plug part 14 Rubber part 16 Flange part 17 Seal rubber

Claims (2)

[Claims] 1. An oil seal device for an injection pipe interposed between a through hole formed in a cylinder head cover and an injection pipe penetrating the through hole, wherein a cylindrical metal press-fitted into the through hole. An oil seal device for an injection pipe, comprising: a plug portion; and a tubular rubber portion that is integrally attached to a tip portion of the metal plug portion and that is in close contact with an outer peripheral surface of the injection pipe. 2. A flange portion extending toward the outer peripheral side is formed at the base end portion of the metal plug portion, and a seal rubber is attached to the flange portion, the seal rubber being in close contact with the outer peripheral edge portion of the through hole on the outer surface of the cylinder head cover. The oil seal device for an injection pipe according to claim 1.