JP2003106455A - Injection pipe seal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an injection pipe seal securing a stable sealing performance. SOLUTION: A first seal member 20 is provided with a first fitting part 22 for being fitted to the internal circumferential surface of an insertion hole 51 and a seal lip 23 for sealing the outer circumferential surface of an injection pipe 60. A second seal member 30 is provided with a second fitting part 32 for being fitted to the first seal member 20 and a dust lip 33 for sealing the outer circumferential surface of the injection pipe 60.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection pipe seal for sealing a gap between an insertion hole provided in a head cover of a cylinder head and an injection pipe inserted in the insertion hole.

[0002]

2. Description of the Related Art Conventionally, an injection pipe seal of this type has been shown in FIG. 6, for example.
FIG. 6 is a schematic cross-sectional view showing a mounted state of an injection pipe seal according to a conventional technique.

As shown in the figure, the injection pipe seal 100 seals a gap between an insertion hole 51 provided in the head cover 50 of the cylinder head and an injection pipe 60 inserted into the insertion hole 51. .

An insertion hole 51 provided in the head cover 50
In order to fit the injection pipe seal 100, a cylindrical portion 52 and an inward flange 53 provided at the end portion thereof are provided around the circumference of.

Then, the injection pipe seal 1
00 is a fitting portion 10 that seals the inner peripheral surface of the cylindrical portion 52 corresponding to the inner periphery of the insertion hole 51 while sealing the inner peripheral surface.
1 is provided. The axial end surface of the fitting portion 101 is brought into contact with the inner surface of the inward flange 53.

Also, the injection pipe seal 10
No. 0 is provided with a seal lip 102 that seals the outer peripheral surface of the injection pipe 60 while being provided so as to follow the outer peripheral surface of the injection pipe 60.

The seal lip 102 has a U-shaped cross section, and in the illustrated example, the injection pipe 60 is mounted from the inside of the head cover 50 to the outside thereof. The tip is also in contact with the outer peripheral surface of the injection pipe 60 in a state where the tip extends outward from the inside of the head cover 50.

With such a structure, the gap between the insertion hole 51 provided in the head cover 50 of the cylinder head and the injection pipe 60 inserted into the insertion hole 51 is sealed to prevent oil leakage to the outside. In addition to the prevention, the sealing property is secured even when the injection pipe 60 is eccentric.

[0009]

However, in the case of the above-mentioned prior art, the following problems have occurred.

In the case of the above-mentioned injection pipe seal 100 according to the prior art, dust that has entered the cylindrical portion 52 of the head cover 50 accumulates in the seal lip 102 that is curved in a substantially U shape.

In particular, when muddy water enters and accumulates in the seal lip 102 curved in a substantially U shape, it may be solidified and clogged, which may deteriorate the followability. As a result, there is a possibility that the sealing performance may be deteriorated when the injection pipe 60 is eccentric.

The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide an injection pipe seal which secures stable sealing performance.

[0013]

In order to achieve the above object, in the present invention, in an injection pipe seal for sealing a gap between an injection pipe and an insertion hole for an injection pipe provided in a head cover, While being fitted to the inner peripheral surface of the insertion hole, the first fitting portion that seals the inner peripheral surface of the insertion hole and the outer peripheral surface of the injection pipe are provided so as to be able to follow.
A first seal member having a seal lip that seals the outer peripheral surface of the injection pipe, and a seal on the inner peripheral surface of the first fitting portion while being fitted to the inner peripheral surface of the first fitting portion. A second sealing member having a second fitting portion to be performed and a dust lip for sealing the outer peripheral surface of the injection pipe is provided.

Therefore, the first seal member exhibits the sealing property even when the injection pipe is eccentric. Further, since the dust is prevented from entering by the second seal member, the sealing property of the first seal member is not deteriorated. Furthermore, since the first seal member and the second seal member are fitted together, they can be handled as one seal.

Both the seal lip and the dust lip may be in close contact with the outer peripheral surface of the injection pipe while extending from the inner side to the outer side of the head cover.

As a result, when the injection pipe is inserted from the inside of the head cover to the outside with the injection pipe seal attached to the head cover, both the seal lip and the dust lip are stably attached to the injection pipe. Can be closely attached.

The first fitting portion provided on the first seal member is provided with a first metal ring exposed to the outside at one end side in the axial direction, and the second metal ring is provided on the second seal member. The fitting portion may be provided with a second metal ring that extends in the radial direction from one end side in the axial direction and contacts the first metal ring.

As a result, the positional relationship between the first seal member and the second seal member can be accurately determined.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be illustratively described in detail below with reference to the drawings. However, the dimensions of the components described in this embodiment,
Unless otherwise specified, the material, the shape, the relative arrangement, and the like are not intended to limit the scope of the present invention thereto.

(First Embodiment) An injection pipe seal according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a schematic sectional view showing a mounted state of an injection pipe seal according to a first embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of the injection pipe seal according to the first embodiment of the present invention. FIG. 3 shows a member (first part) that constitutes an injection pipe seal according to the first embodiment of the present invention.
It is a typical sectional view of a seal member). FIG. 4 is a schematic cross-sectional view of a member (second seal member) forming the injection pipe seal according to the first embodiment of the present invention.

As shown in the figure, the injection pipe seal 10 seals a gap between an insertion hole 51 provided in the head cover 50 of the cylinder head and an injection pipe 60 inserted into the insertion hole 51. .

Insertion hole 51 provided in head cover 50
In order to fit the injection pipe seal 10, a cylindrical portion 52 and an inward flange 53 provided at an end of the cylindrical portion 52 are provided around the circumference of the cylindrical portion 52.

Then, the injection pipe seal 1
The reference numeral 0 generally includes a first seal member 20 and a second seal member 30 fitted to the first seal member 20.

The first seal member 20 has a first fitting portion 22 for fitting to the inner peripheral surface of the insertion hole 51.
A first metal ring 21 for reinforcing the first fitting portion 22 and a seal lip 23 for sealing the outer peripheral surface of the injection pipe 60 are provided.

The outer peripheral surface 22a of the first fitting portion 22 is
While being fitted to the inner peripheral surface of the cylindrical portion 52 corresponding to the inner peripheral surface of the insertion hole 51, the inner peripheral surface is sealed. Further, the surface 22b on the one end side in the axial direction of the first fitting portion 22 contacts the inner surface 31a of the second metal ring 31 provided on the second seal member.

Further, the first fitting portion 22 has the second sealing member 3
A fitting convex portion 22d for fitting 0 is provided.

The first metal ring 21 is an annular member having an L-shaped cross section, and only the surface on the one end side in the axial direction is exposed, and the other part is buried inside the first fitting portion 22.

The seal lip 23 is provided so as to be able to follow the outer peripheral surface of the injection pipe 60 and has a function of sealing the outer peripheral surface, and has a cross section curved in a substantially U shape. Since the injection pipe 60 is mounted from the inside of the head cover 50 to the outside in the illustrated example, the seal lip 23
The tip 23a of the head 23 is also in contact with the outer peripheral surface of the injection pipe 60 in a state of extending from the inside of the head cover 50 to the outside.

Further, on the outer peripheral side of the tip 23a of the seal lip 23, this tip 23a is inserted into the injection pipe 6
A spring 24 is provided for pressing against the outer peripheral surface of 0. Therefore, even if the injection pipe 60 is eccentric, the seal lip 23 appropriately follows and thus exhibits stable sealing performance.

The first seal member 2 described above is used.
For 0, it is possible to use the injection pipe seal according to the above-mentioned conventional technique as it is.

Further, in the first seal member 20, as the material of the first metal ring 21, for example, SPCC (cold rolled steel plate) or SUS (stainless steel) can be applied, and especially considering the water resistance. SUS is desirable, and acrylic rubber is suitable as the material of the seal component.

The second seal member 30 is the first seal member 2
Second fitting portion 32 for fitting into 0, and second fitting portion 32
Second metal ring 31 for reinforcing the pipe and dust lip 3 for sealing the outer peripheral surface of the injection pipe 60.
3 and.

The second fitting portion 32 has the first sealing member 2 described above.
The fitting recess 32 that fits into the fitting projection 22d
a is provided, and by fitting them, the fitting recess 3
The outer peripheral surface of 2a seals the inner peripheral surface of the first fitting portion 22.

Therefore, it is possible to prevent dust (such as muddy water) from entering between the first seal member 20 and the second seal member 30.

Further, on the tip side of the fitting recess 32a,
A part with the same diameter in the axial direction (the part that is parallel to the shaft in cross section)
32b is provided. This is because if this portion is curved in a cross-sectional shape such as an R shape, the fitting convex portion 22d easily rides on the fitting convex portion 22d and the fitting concave portion 32a is easily disengaged. This is to prevent this.

The second seal member is fitted at a position apart from the seal lip 23 provided on the first seal member (at least a position where it does not interfere with the curved portion of the seal lip 23). Therefore, the follow-up operation of the seal lip 23 is not hindered.

The second metal ring 31 is an annular member having an L-shaped cross section, a part of which is buried inside the second fitting portion 32, and has a structure that extends radially from one end side in the axial direction. There is. Then, when the second seal member 30 is fitted to the first seal member 20, the inner surface 31 a of the radially extending portion of the second metal ring 31 comes into contact with the exposed portion of the first metal ring 21. It is composed.

Therefore, when the second seal member 30 is fitted on the first seal member 20, the positional relationship in the axial direction can be determined by the metal-metal contact, so that the positioning can be stabilized. it can.

Further, the injection pipe seal 10
1, the outer surface of the radially extending portion of the second metal ring 31 abuts the inner surface of the inward flange 53 provided on the head cover 50, as shown in FIG. It will be in the state of doing.

Therefore, the injection pipe seal 1
With 0, the mounting position is highly accurate, and the mounting position is stable.

As shown in FIG. 4, the dust lip 33 extends to the inner diameter side in the free state, and its inner diameter dimension is set to be smaller than the outer diameter dimension of the injection pipe 60.

Therefore, in a state where the injection pipe 60 is inserted, as shown in FIG.
Reference numeral 3 indicates a state in which the head cover 50 extends from the inside to the outside and is in close contact with the outer peripheral surface of the injection pipe 60.

A step 3 is formed at the root of the dust lip 33.
As shown in FIG. 1, the dust lip 33 does not interfere with the inward flange 53 of the head cover 50 even when the injection pipe 60 is inserted.

In the second seal member 30, the material of the second metal ring 31 is, for example, SPCC or SUS.
Can be applied, especially considering the water resistance
However, acrylic rubber or HNBR is suitable for the material of the seal component.

With the above-mentioned structure, dust can be prevented from entering by the dust lip 33 provided on the second seal member 30, so that dust adheres to the seal lip 23 provided on the first seal member, It does not accumulate in the curved part.

Therefore, since the seal lip 23 can perform a stable follow-up operation with time, it exhibits a stable sealing property for a long period of time.

Next, the mounting work of each member will be described.

First, the second seal member 30 is fitted to the first seal member 20 to inject the injection pipe seal 10.
Assemble. Thereby, the injection pipe seal 10 can be handled as one component.

Next, the injection pipe seal 10
To the head cover 50. In this case,
As described above, the injection pipe seal 10 can be handled as one component, so that the injection pipe seal 10 can be easily fitted by one fitting operation.

Then, the injection pipe 60 is inserted into the insertion hole 51, and the mounting work is completed.

If the injection pipe 60 is damaged, only the injection pipe 60 should be removed and replaced. In addition, the first seal member 2
0 or if the second seal member 30 is damaged, first remove the injection pipe seal 10,
It is sufficient to replace the damaged member.

Thus, the maintainability is also excellent.

(Second Embodiment) FIG. 5 shows a second embodiment. In the present embodiment, a modified example of the configuration of the second seal member will be described.

Since other configurations and operations are the same as those of the first embodiment, the same reference numerals are given to the same components and the description thereof will be omitted.

In the first embodiment described above, the second metal ring provided on the second seal member has exposed portions on both surfaces thereof, and one surface is the first metal ring provided on the first seal member. 1
The metal ring is brought into contact with the other surface, and the other surface is brought into contact with the inward flange of the head cover.

On the other hand, the second embodiment
The metal ring exposes only the surface to be brought into contact with the first metal ring provided in the first seal member, and the other surface is provided with a rubber seal portion, which is brought into contact with the inward flange of the head cover. It was configured to let.

The other points are the same as in the above embodiment.

FIG. 5 is a schematic sectional view of a member (second seal member) constituting the injection pipe seal according to the second embodiment of the present invention.

As shown in the figure, the second metal ring 31 provided in the second seal member 30a according to the present embodiment is also exposed on the inner side as in the case of the above-described embodiment, and the first metal ring 31 is exposed.
The second metal ring 31 is fitted in the seal member 20.
Then, the first metal ring 21 comes into contact with each other.

However, the outer side of the second metal ring 31 is not exposed and the seal projection 35 is provided. Therefore,
When the injection pipe seal 10 is mounted, the seal projection 35 is in close contact with the inward flange 53 and forms a sealing surface.

As a result, in the case of the present embodiment, as compared with the case of the first embodiment, the accuracy of the mounting position is reduced, but the sealability can be further improved.

[0062]

As described above, according to the present invention, since the second seal member prevents the intrusion of dust, it is possible to suppress the deterioration of the sealability by the first seal member and to prevent the eccentricity of the injection pipe for a long time. Delivers stable sealing performance over the entire length. Further, by fitting the first seal member and the second seal member together, they can be handled as one seal, and the mountability and maintainability are excellent.

Both the seal lip and the dust lip are in contact with the outer peripheral surface of the injection pipe in a state of extending from the inner side to the outer side of the head cover, so that the injection pipe is inserted from the inside of the head cover to the outside. In this case, both the seal lip and the dust lip can be brought into close contact with the injection pipe in a stable state.

By bringing the first metal ring and the second metal ring into contact with each other, the positional relationship between the first seal member and the second seal member can be accurately determined, so that stable sealability can be exhibited. Becomes

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing a mounted state of an injection pipe seal according to a first embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view of the injection pipe seal according to the first embodiment of the present invention.

FIG. 3 is a schematic cross-sectional view of a member (first seal member) that constitutes the injection pipe seal according to the first embodiment of the present invention.

FIG. 4 is a schematic cross-sectional view of a member (second seal member) forming the injection pipe seal according to the first embodiment of the present invention.

FIG. 5 is a schematic cross-sectional view of a member (second seal member) that constitutes an injection pipe seal according to a second embodiment of the present invention.

FIG. 6 is a schematic cross-sectional view showing a mounted state of an injection pipe seal according to a conventional technique.

[Explanation of symbols]

10 Injection pipe seal 20 First seal member 21 First metal ring 22 First Fitting Part 22a outer peripheral surface 22b (on the one end side in the axial direction of the first fitting portion) surface 22c inner peripheral surface 22d Fitting convex part 23 Seal Lip 23a (seal lip) tip 24 spring 30 Second seal member 30a Second seal member 31 Second metal ring 31a (inside second metal ring) surface 32 Second Fitting Part 32a fitting recess 33 dust lip 33a step 35 Seal protrusion 50 head cover 51 insertion hole 52 Cylindrical part 53 Inward flange 60 injection pipes

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Atsunori Yamada             590-1, Jigata, Sagara-cho, Haibara-gun, Shizuoka             OK Co., Ltd. (72) Inventor Shigeo Takeuchi             1 Toyota Town, Toyota City, Aichi Prefecture Toyota Auto             Car Co., Ltd. F-term (reference) 3G024 AA72 BA15 BA20 BA21 EA01                       FA08 HA14                 3G066 AA01 AA07 AB02 BA35 BA65                       CD17                 3J040 BA03 EA02 EA27 HA03 HA16

Claims (3)

[Claims] Claim: What is claimed is: 1. An injection pipe seal for sealing a gap between an injection pipe and an insertion hole for an injection pipe provided in a head cover, wherein the injection pipe seal is fitted into an inner peripheral surface of the insertion hole while A first seal member having a first fitting portion that seals a peripheral surface, and a seal lip that is provided so as to follow the outer peripheral surface of the injection pipe and seals the outer peripheral surface of the injection pipe; The first fitting portion includes a second fitting portion that seals the inner peripheral surface of the first fitting portion while being fitted to the inner peripheral surface of the first fitting portion, and a dust lip that seals the outer peripheral surface of the injection pipe. An injection pipe seal, comprising: a second seal member. 2. The seal lip and the dust lip are in close contact with the outer peripheral surface of the injection pipe in a state of extending from the inner side to the outer side of the head cover. Injection pipe seal. 3. The first fitting portion provided on the first seal member is provided with a first metal ring exposed to the outside at one end side in the axial direction, and is provided on the second seal member. The injection pipe seal according to claim 1 or 2, wherein the second fitting portion is provided with a second metal ring that extends in the radial direction from one end side in the axial direction and abuts on the first metal ring. .