JP3293526B2 - Seal structure using liquid gasket - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal structure using a liquid gasket, for example, a mist-like or liquid oil seal structure of an internal combustion engine using a liquid gasket.

[0002]

2. Description of the Related Art Conventionally, as shown in Japanese Utility Model Laid-Open Publication No. 60-59897 and FIG. 5, in a seal structure using a liquid gasket, a portion of the object to be fastened due to lack of rigidity or thermal deformation. By partially increasing the thickness of the liquid gasket 1, the liquid gasket 1 is elastically deformed on the sealing surface 6 to prevent the liquid gasket from being cut or peeled. The liquid gasket hardens when it comes into contact with air, but is applied and formed such that the end of the thick part is exposed to the air inside the seal part in order to accelerate the hardening of the thick part 1a. This seal structure is often applied to a seal portion in which the inside of the seal portion is an oil region 2 in which mist-like oil is present.
The end of “a” is exposed to the oil mist 3.

[0003]

However, the conventional structure has the following problems. When the thick portion 1a of the liquid gasket 1 has a larger capacity than the liquid gasket applied to the normal mating surface, the curing speed is slower and the mist or liquid adheres to the end of the thicker portion 1a at the initial stage of curing. Hindered, the cure speed is even slower. For example, in the case where oil does not adhere, the material which cures to a hardness having a sealing property in about 30 minutes, requires two to three hours or more due to the adhesion of oil. As described above, when the seal surface 6 moves in such an uncured state, the liquid gasket thick portion 1a is peeled from the seal surface 6 or the thick portion 1a itself is cut, thereby causing oil leakage. . The object of the present invention is to
An object of the present invention is to provide a seal structure using a liquid gasket which suppresses contact of a thick portion of the liquid gasket with mist-like or liquid oil and promotes hardening of the liquid gasket.

[0004]

The present invention to achieve the above object is as follows. (1) Between the thick portion of the liquid gasket applied and formed with a partially increased thickness between the two sealing surfaces and the oil region where the mist or liquid oil exists ,
At least one of the two sealing surfaces
The space is recessed from the sealing surface to
Formed so that the sealing surface remains between the oil area
And a sealing structure using the liquid gasket, wherein an end of the thick part of the liquid gasket is exposed to the space. (2) The seal structure using the liquid gasket according to (1), wherein the space portion is open to the oil region at a lower end thereof. (3) The seal structure using a liquid gasket according to (1), wherein the space portion also functions as an escape groove for oil leaked from a seal surface of the high-pressure oil passage.

[0005] In the sealing structure using the liquid gasket of the above (1), a space portion having a sealing surface left between the oil region and the oil region is provided, and the end of the thick portion of the liquid gasket is provided in this space portion. By exposing the portion, contact between the end of the liquid gasket thick portion and the oil is suppressed. As a result, the end of the thick portion of the liquid gasket comes into contact with air, the curing starts from the end in contact with the air, and the curing proceeds in a direction away from the end, and the curing is performed over the entire thick portion of the liquid gasket. Facilitate. In the sealing structure using the liquid gasket of the above (2),
Since the lower end of the space is open, even if mist or liquid oil enters the space and tries to accumulate in the space, it flows out from the opening at the lower end, so that the oil does not accumulate in the space The end of the liquid gasket thick portion does not come into contact with the accumulated oil. In the seal structure using the liquid gasket of the above (3),
Since the space portion is also used as an oil escape groove, there is no need to separately provide the space portion and the oil escape groove, and the device becomes compact.

[0006]

1 and 2 show a first embodiment of the present invention, and FIGS. 3 and 4 show a second embodiment of the present invention. Components common or similar to both embodiments are denoted by the same reference numerals throughout both embodiments. First, components common or similar to any of the embodiments of the present invention will be described with reference to, for example, FIGS.

In any of the embodiments of the present invention, the sealing structure using the liquid gasket is composed of a thick portion 1a of the liquid gasket 1 having a partially increased thickness and an oil region in which mist or liquid oil exists. The space portion 4 in which the intrusion of the oil 3 is suppressed is formed between the liquid gasket 2 and the end portion 1 b of the thick portion 1 a of the liquid gasket 1. When the end 1b of the thick portion 1a of the liquid gasket 1 has the protrusion 1c, the end 1b of the thick portion 1a is exposed to the space 4 via the protrusion 1c. Positions a, b, c, c ', d and e in FIG. 1 and positions a, b, c and c in FIG.
', D, and e correspond to each other, and the portion between c and c' is the protruding portion 1c.

The sealing surface 6 comprises two opposing sealing surfaces 6
a, 6b, and substantially all of the sealing surfaces 6a, 6b (including the portion that does not correspond to the thick portion 1a of the liquid gasket 1, that is, the portion between the positions e and d, etc.) Gasket 1 is applied and sealing surfaces 6a, 6
A layer of the liquid gasket 1 is formed between b. By retreating at least one of the two sealing surfaces 6a and 6b from the stepwise facing surface, the retreated portion (position c
The thickness of the liquid gasket 1 at the portion between (d) and (d) is increased, and the thick portion 1a is formed.

At least one of the sealing surfaces 6a and 6b has a groove formed in the portion between the thick portion 1a of the liquid gasket 1 and the oil region 2 so as to be recessed from the facing surface. Is formed. The sealing surface 6 is left between the space 4 and the oil region 2 (the portion between the positions a and b), and the mist or liquid oil 3 from the oil region 2 enters the space 4. That has been suppressed. The space 4 has an opening in the oil region 2 at the lower end thereof. Accordingly, an opening 5 communicating the space 4 and the oil region 2 is formed corresponding to the lower end of the space 4, and the space 4 is formed in the space 4. Even if oil accumulates, it easily flows into the oil area 2 by its own weight.

Next, the operation of the above common components will be described. In the sealing structure using the liquid gasket, the space 4 in which the mist or liquid oil is prevented from entering.
The end portion 1b of the liquid gasket thick portion 1a is exposed to the space portion 4 directly or through the protruding portion 1c, so that the end portion of the liquid gasket thick portion 1a and the oil (mist or liquid) are exposed. Is suppressed. as a result,
The end portion 1b of the liquid gasket thick portion 1a comes into contact with air without being blocked by oil, and the hardening starts from the end portion 1b that comes into contact with the air and moves away from the end portion (from position c to d and then e). ), And the curing is accelerated over the entire thick portion of the liquid gasket.

In the seal structure using the liquid gasket, since the lower end of the space 4 is open, even if mist-like or liquid oil enters the space 4 and tries to accumulate in the space, Since the oil flows out from the opening 5 at the lower end, the oil does not accumulate in the space 4 and the liquid gasket thick portion end 1b does not contact the accumulated oil.

Next, a configuration specific to each embodiment of the present invention,
The operation will be described. In the first embodiment of the present invention, FIGS.
As shown in the figure, the seal structure using the liquid gasket
Cylinder block 11 and cylinder head 12 of an internal combustion engine
Is applied to the seal surface 6 (near the mating surface of the three members) between the assembly with the chain case 13 and the inside of the seal portion is an oil region 2 filled with oil mist. . As shown in FIG.
A stepped sealing surface extending in the vertical direction is formed on the block 2 and the block 11, and the liquid gasket 1 is applied to the entire sealing surface 6, and the stepped retreat portion is a thick portion 1 a of the liquid gasket 1. A space portion 4 extending in the vertical direction is formed inside the thick portion 1a, and an opening 5 opening to the inside oil region 2 is formed at the lower end thereof. As shown in FIG. 2, the chain case 13
Is mounted, the cylinder block 11 and the cylinder head 1
2 and the chain case 13 are sealed. Between the space portion 4 and the inner oil region 2, there are portions a and b of the sealing surface 6 (this portion may or may not be coated with a liquid gasket). I have.

Regarding the operation of the first embodiment, due to the above structure, the oil 3 hardly enters the space 4 (when it enters, only through the opening 5), and even if it does, it easily flows out of the opening 5 at the lower end. . Therefore, the space portion 4 is in a state where there is no or almost no oil mist, and the end portion 1b of the thick portion 1a of the liquid gasket 1 is easily hardened by air, and its speed is high (for example, about 30). In minutes). Therefore, during the time (30 minutes or more) between the time when the engine is coated with the liquid gasket on the assembling line and the assembly is applied to the operation test and then tested, the liquid gasket 1 has the thick-walled portion 1.
The entire area including a is hardened to a hardness having a sealing property, and there is no problem that the sealing surface 6 moves in the operation test to break the seal portion.

According to a second embodiment of the present invention, as shown in FIGS. 3 and 4, a seal structure using a liquid gasket is provided in the cylinder block 11 of the internal combustion engine near the high-pressure oil passage 7.
This shows a case where the present invention is applied to the sealing surface 6 between the (or the cylinder head 12) and the chain case 13. The high-pressure oil passage 7 is filled with high-pressure liquid oil whose pressure has been increased by a pump. This is the oil area 2. As shown in FIG. 3, the high-pressure oil passage 7 extends horizontally. As shown in FIG. 4, block 11 (head 12
), A liquid sealing gasket 1 is applied to almost the entire surface of the sealing surface 6, and a stepped retreat portion is a thick portion 1 a of the liquid gasket 1. . A space portion 4 is formed inside the thick portion 1a so as to bend in the vertical direction and extends downward.
As shown in FIG. 5, an opening 5 opening inward is formed.
As shown in FIG. 4, a chain case 13 is mounted on the liquid gasket application surface, and the space between the cylinder block 11 or the cylinder head 12 and the chain case 13 is sealed. Also, the sealing surface section between the high pressure oil passage 7 and the space portion 4 may not be coated be coated with a liquid gasket. When a small amount of oil leaking from the high-pressure oil passage 7 reaches the space 4, the oil flows downward in the space 4 by gravity and flows out of the opening 5. That is, the space 4
The hole also functions as a relief groove for a small amount of oil leaked from the high-pressure oil passage 7.

Regarding the operation of the second embodiment, due to the above configuration, the oil 3 hardly enters the space 4 (when it enters, only through the opening 5), and even if it does, it easily flows out of the opening 5 at the lower end. . Therefore, the space portion 4 has no or almost no oil mist, and the end portion 1b of the thick portion 1a of the liquid gasket 1 is easily hardened by air, and its speed is high. Therefore, the liquid gasket 1 also has a thick portion 1a during a period of time (30 minutes or more) from the time when the engine is coated with the liquid gasket on the assembly line to the time when it is passed to an operation test and tested. The entire area is hardened, and there is no problem that the seal surface 6 moves and breaks the seal portion in the operation test. Further, even if oil leaks from the high-pressure oil passage 7 into the space 4, the amount thereof is very small and does not wet the end 1 b of the thick portion 1 a of the liquid gasket 1. Therefore, the hardening of the liquid gasket 1 is not delayed.

[0016]

According to the seal structure using the liquid gasket of the first aspect, the seal surface is left between the oil region and the oil region.
And the space portion is provided, by exposing the end portion of the liquid gasket thick portion in the space portion, the contact between the end portion and the oil of the liquid gasket thick portion is suppressed. As a result, the end of the liquid gasket thick portion comes into contact with air, and the hardening can be promoted over the entire liquid gasket including the liquid gasket thick portion. According to the seal structure using the liquid gasket of claim 2, since the lower end of the space is opened, even if mist-like or liquid oil tries to enter the space and accumulate in the space, the lower end is opened. Therefore, the oil does not accumulate in the space, the end of the liquid gasket thick portion does not contact the accumulated oil, and good curing can be maintained. According to the seal structure using the liquid gasket of claim 3, since the space can be used as an oil escape groove, it is not necessary to separately provide the space and the oil escape groove. The structure can be made compact.

[Brief description of the drawings]

FIG. 1 is a front view of a seal structure using a liquid gasket according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 1 is a front view of a seal structure using a liquid gasket according to a second embodiment of the present invention.

FIG. 4 is a sectional view taken along line BB of FIG. 3;

FIG. 5 is a sectional view of a seal structure using a conventional liquid gasket.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid gasket 1a Thick part 1b End of thick part 1c Protruding part 2 Oil area 3 Oil 4 Space part 5 Opening of space part 6, 6a, 6b Seal surface 7 Oil passage 11 Cylinder block 12 Cylinder head 13 Chain case

Claims (3)

(57) [Claims] 1. A between the two thicknesses portion between the sealing surface thickly to coating, formed thick portion and the mist or oil region oil is present in the liquid of the liquid gasket, before
At least one of the two sealing surfaces is paired.
The space portion is retreated in a groove shape from the facing seal surface to form a space.
So that a sealing surface remains between the section and the oil area.
Form, were exposed ends of the thick portion of the liquid gasket space portion, the seal structure using a liquid gasket. 2. A seal structure using a liquid gasket according to claim 1, wherein said space portion has an opening at said lower end portion in said oil region. 3. A seal structure using a liquid gasket according to claim 1, wherein said space portion also functions as an escape groove for oil leaking from a seal surface of a high-pressure oil passage.