JPH11173423A - Sealing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a tightly fastening spring from sliding from a prescribed mounted position and from falling down from a fixing part, prevent generation of rust on the tightly fastening spring, and hold stable mounting property and sealing property for a long period, in a sealing device mounted between a cylinder head cover of an engine and a fuel injection nozzle mainly. SOLUTION: In a sealing device 11 which is provided with a cylindrical sealing device main body 12 inserted into a hole part 3 arranged on a cylinder head cover 1, and which is formed in such a constitution that a flange part 13 abutting on an opening circumferential edge part of the hole part 3 is arranged on one end part of an axial direction of the sealing device main body 12, a fixing part 14 fitted to an outer periphery of a fuel injection nozzle 2 is arranged on the other end part of the axial direction of the sealing device main body 12, and a tightly fastening spring 18 is mounted on the fixing part 14; the tightly fastening spring 18 is integrated with the fixing part 14 by means of molding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a sealing device,
In particular, the present invention relates to a sealing device suitable for being mounted between a cylinder head cover of an engine and a fuel injection nozzle.

[0002]

2. Description of the Related Art As shown in FIG. 3, a general internal combustion engine has a cylinder block 53 provided with a cylinder 52 having a piston 51 inserted therein. Exhaust valve 5
The cylinder head 55 is provided with an oil pan (not shown) which is hermetically attached to the bottom of the cylinder block 53 and stores lubricating oil. It is fixed to the cylinder head 55 inside the cylinder head cover 57 attached so as to cover, and a pipe union 58 is connected to the fuel injection nozzle 56 through the hole 57a of the cylinder head cover 57, and the fuel pipe 59 Are connected to the pipe union 58.

In the above internal combustion engine, since the fuel injection nozzle 56 is fixed to the cylinder head 55 and the fuel pipe 59 is fixed to the engine body, the fuel injection nozzle 56 and the pipe union 58 are screwed together. Although the portion is not directly attached to the cylinder head cover 57, a sealing device for sealing the hole portion 57a is used to maintain the airtightness of the inside of the cylinder head cover 57. It is installed between and.

Conventionally, the sealing device 60 is configured as shown in FIG. 4, but has the following disadvantages.

That is, first, at one end (the lower end in the figure) of a cylindrical sealing device main body 61, an annular fixing portion 62 fitted to the outer periphery of the fuel injection nozzle 56 is provided. An annular mounting groove 63 is provided on an outer peripheral surface of the mounting groove 63, and an annular tightening spring 64 is fitted in the mounting groove 63 later, so that the tightening spring 64 is detached from the mounting groove 63 due to engine vibration or the like. The fixing part 62
Or fall off. In such a case, an appropriate amount of tension cannot be applied to the fixing portion 62, so that the mounting property to the fuel injection nozzle 56 and the sealing property are impaired.

Further, since the outer peripheral portion of the tightening spring 64 fitted in the mounting groove 63 often protrudes radially outward from the outer peripheral surface of the fixing portion 62, the sealing device 60 is attached to the hole of the cylinder head cover 57. At the time of insertion into the portion 57a, the tightening spring 64 interferes with the peripheral edge of the opening of the hole 57a.
May be out of order. The tightening spring 64 has the hole 57
If it interferes with the periphery of the opening a, the workability of mounting will be impaired.

Further, in the above-mentioned prior art, the tightening spring 64 is detached from the mounting groove 63 and does not drop off from the fixing part 62. A large-diameter spring holder 65 is provided.
Has a relatively large rigidity because it has a relatively large diameter. Therefore, since the spring holder 65 having such a large rigidity is provided immediately adjacent to the tightening spring 64, the tightening force of the tightening spring 64 may be reduced. In order to cope with the above, it is necessary to use a tightening spring having a large tightening force. Also, at the time of the above-mentioned insertion mounting, the spring holder portion 65 may interfere with the opening peripheral portion of the hole portion 57a and be turned up, so that the tightening spring 64 may come off from the mounting groove 63.

Furthermore, in the above-mentioned prior art, since almost the entire surface of the tightening spring 64 fitted in the mounting groove 63 is exposed to the outside, when the material of the tightening spring 64 is SWP or the like, the mounting is difficult. Rust may occur in the tightening spring 64 before and after the above.

[0009]

SUMMARY OF THE INVENTION In view of the above, the present invention does not cause the tightening spring to be displaced from a predetermined mounting position or drop off from the fixed portion, and no rust is generated on the tightening spring. Accordingly, it is an object of the present invention to provide a sealing device capable of maintaining stable mounting and sealing properties for a long period of time.

[0010]

In order to achieve the above object, a sealing device according to the present invention comprises a cylindrical sealing device body inserted through a hole provided in one of the mounting members, A flange is provided at one end in the axial direction to contact an opening peripheral portion of the hole, and a fixing portion fitted to the outer periphery of the other mounting member is provided at the other end in the axial direction of the sealing device main body. Wherein the tightening spring is integrated with the fixed portion by molding.

The sealing device of the present invention having the above configuration is suitable for being mounted between the cylinder head cover of the engine and the fuel injection nozzle as described above,
Since the tightening spring is integrated with the fixed portion by molding, the following operation is achieved.

That is, since the tightening spring is integrated with the fixed portion by molding as described above, the tightening spring does not move relative to the fixed portion. Therefore, it is possible to prevent the tightening spring from being displaced from the predetermined mounting position or falling off from the fixed portion.

Further, since the tightening spring is integrated with the fixed portion by molding as described above, the tightening spring is embedded in the thickness of the fixed portion and covered with the rubber-like elastic material of the fixed portion. Have been. Therefore, it is possible to prevent rust from being generated in the buried and covered portion.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a sealing device 11 according to the embodiment.
FIG. 2 is a cross-sectional view of FIG.
The sealing device 11 is mounted between the cylinder head cover 1 of the diesel engine and the fuel injection nozzle 2 as shown.

A hole (also referred to as a through hole) 3 is provided in the cylinder head cover 1 so as to penetrate its thickness, and a pipe union 4 is inserted into the hole 3 from above in the drawing in a non-contact manner. The distal end portion 4a of the pipe union 4 is connected to the distal end portion 2a of the fuel injection nozzle 2.

The sealing device 11 is provided with a sealing device main body 12 made of a rubber-like elastic material having a substantially cylindrical shape. One end of the sealing device main body 12 in the axial direction (upper end in the figure) is provided with:
An annular flange portion 13 is provided integrally with the opening peripheral portion of the hole portion 3 so as to abut from above in the figure, and the other end (the lower end in the figure) of the fuel injection nozzle 2 is also provided at the other axial end. Diameter part 2
An annular fixing portion 14 fitted on the outer periphery of the portion b is provided integrally. Although the sealing device body 12 is formed in a substantially cylindrical shape as described above, since the sealing device 11 is inserted into the hole 3 from above in the drawing, mounting workability is improved. In order to improve, the sealing device body 12
Has a slightly tapered outer peripheral surface.

Upper part of the sealing device body 12 in the figure and the flange 1
3, a metal mounting ring 15 having a substantially L-shaped cross section is embedded, and a flange portion 15a of the mounting ring 15 forms a part of the flange portion 13 and its lower surface is exposed. The mounting ring 15 is adapted to directly engage with the peripheral edge of the opening of the hole 3 at the flange portion 15a. A convex portion 16 made of a rubber-like elastic material having an annular shape is provided on the upper side in the figure of the flange portion 15a toward the upper side in the figure, and the convex portion 16 is pressed by the flange 5 of the bolt portion of the pipe union 4. As a result, the flange 5 comes into close contact with the flange 5, whereby the portion is sealed.

A required number of annular beads 17 are integrally provided on the upper outer peripheral surface of the sealing device main body 12 in which the cylindrical portion 15b of the mounting ring 15 is embedded.
This part is sealed by close contact with the inner wall of the.

An annular tightening spring (also referred to as a garter spring) 18 is embedded in the fixed portion 14, and the fixed portion 14 is attached to the outer periphery of the large-diameter portion 2 b of the fuel injection nozzle 2 by the tightening force (spring force). It is adapted to be fitted and fixed. The tightening spring 18 is integrated with the fixing portion 14 at the same time as the molding by inserting the tightening spring 18 into a mold (not shown) for vulcanizing the sealing device body 12, that is, On the other hand, they are integrated by molding. The tightening spring 18 is formed by spirally winding a metal wire such as SWP. In addition, the tightening spring 18 is entirely buried in a tip portion (a lower end portion in the figure) of the fixed portion 14. The mounting groove and the spring holder portion in the prior art shown in FIG. 4 are not provided on the fixing portion 14, and the outer peripheral surface of the fixing portion 14 is substantially the same as the outer peripheral surface of the sealing device main body 12 which is slightly tapered. It is molded flush.

An annular seal 19 made of rubber-like elastic material is integrally provided on the inner peripheral surface of the fixed portion 14, and this seal 19 is attached to the outer peripheral surface of the large-diameter portion 2 b of the fuel injection nozzle 2. This close seals this part.
This seal portion 19 is formed in a lip shape.

The sealing device 11 having the above-described structure is used to
6 is closely contacted with the flange 5, the bead portion 17 is closely contacted with the inner wall of the hole portion 3, and the seal portion 19 is closely contacted with the outer peripheral surface of the large-diameter portion 2b. Can be sealed.

Since the tightening spring 18 is integrated with the fixed portion 14 by molding, the following effects can be obtained.

That is, since the tightening spring 18 is integrated with the fixed portion 14 by molding as described above, the tightening spring 18 is
And does not move alone. Therefore, it is possible to prevent the tightening spring 18 from being displaced from the predetermined mounting position or falling off from the fixing portion 14. Therefore, an appropriate amount of tension can always be applied to the fixing portion 14 and the sealing portion 19, and thereby the mounting property and the sealing property can be stabilized.

Further, all of the tightening springs 18 are
4 and the outer peripheral surface of the fixing portion 14 is formed substantially flush with the outer peripheral surface of the sealing device body 12 that is slightly tapered, so that the tightening spring 18 and the fixing portion 14 are formed. However, when the sealing device 11 is inserted and mounted in the hole 3, it does not interfere with the peripheral edge of the opening of the hole 3. Therefore, mounting workability can be improved.

Further, since the tightening spring 18 is buried in the distal end of the fixing portion 14 and a spring holder is not provided at the distal end of the fixing portion 14 as in the prior art, the tightening force of the tightening spring 18 is reduced. The power is transmitted to the fixed portion 14 and the seal portion 19 without being reduced by the holder portion. Therefore, the mounting property and the sealing property can be improved.

Further, since the entire tightening spring 18 is buried in the thickness of the fixing portion 14, the entire portion is covered with the rubber-like elastic material of the fixing portion 14. Therefore, it is possible to prevent rust from being generated on the surface of the tightening spring 18, thereby improving the durability of the tightening spring 18.

[0028]

The present invention has the following effects.

That is, in the sealing device of the present invention having the above configuration, since the tightening spring is integrated with the fixed portion by molding as described above, the tightening spring is fixed to the fixed portion. There is no relative movement and no independent movement. Therefore, it is possible to prevent the tightening spring from being displaced from the predetermined mounting position or falling off from the fixed portion. Therefore, it is possible to always apply an appropriate amount of tension to the fixing portion, thereby stabilizing the mounting property and the sealing property.

Further, since the tightening spring is integrated with the fixed portion by molding as described above, the tightening spring is embedded in the thickness of the fixed portion and covered with the rubber-like elastic material of the fixed portion. Will be done. Therefore, it is possible to prevent rust from being generated in the buried and covered portion, thereby improving the durability of the tightening spring.

Further, if the tightening spring is integrated with the fixed portion by molding as described above, the mounting groove and the spring holder portion in the prior art become unnecessary.
Therefore, the workability of mounting the sealing device can be improved, and the mounting and sealing properties can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a sealing device according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a mounted state of the sealing device.

FIG. 3 is an explanatory diagram of a general internal combustion engine.

FIG. 4 is a sectional view of a sealing device according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder head cover (one mounting member) 2 Fuel injection nozzle (the other mounting member) 2a, 4a Tip part 2b Large diameter part 3 Hole part 4 Pipe union 5 Flange 11 Sealing device 12 Sealing device main body 13 Flange part 14 Fixed part 15 Mounting ring 15a Flange part 15b Cylindrical part 16 Convex part 17 Bead part 18 Tightening spring 19 Seal part

Claims (1)

[Claims] 1. A sealing device body (12) having a cylindrical shape inserted through a hole (3) provided in one of the mounting members (1), and the sealing device body (12) is provided at one axial end thereof. A flange portion (13) is provided to abut on an opening edge of the hole portion (3);
The other end of the sealing device body (12) in the axial direction is provided with a fixing portion (14) fitted to the outer periphery of the other mounting member (2),
A sealing device (11) in which a tightening spring (18) is mounted on the fixing portion (14), wherein the tightening spring (18) is integrated with the fixing portion (14) by molding. A sealing device.