JPH10274098A - Sealing structure of three mating parts - Google Patents

Abstract

(57) [Summary] [Problem] To provide a seal structure of a three-surface mating portion that can suitably maintain the sealing property of the three-surface mating portion even when processing burrs and steps occur in the three-surface mating portion. A gasket is sandwiched between a cylinder head and a cylinder block. On the other hand, a liquid gasket 10 is interposed between the cylinder head 2 and the cylinder block 3 and the drive device case 7.
In this case, processing burrs 2a, 3a which may be generated when processing the cylinder head 2 and the cylinder block 3 are provided at positions facing the three-face matching portion of the drive device case 7.
In addition, a relief groove 21 that can absorb a step h that may be caused by an assembly error between the cylinder head 2 and the cylinder block 3 is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing structure of a three-face mating portion in which three mounting members abut against each other.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 6, for example, an engine main body is composed of an oil pan 54, a cylinder block 53 mounted on the oil pan 54, and a cylinder block 5 mounted thereon.
3 Side surfaces of the cylinder head 52, the cylinder head 52, and the cylinder block 53 mounted on the upper surface (the right end in FIG. 6).
Drive case 57 covering cylinder and cylinder head 52
And a head cover 58 mounted on the upper surface of the drive device case 57. In this case, for example, the cylinder head 52 and the cylinder block 5
A three-plane mating portion is formed at a portion C in FIG. 6 where the three assembling members of the drive device case 3 and the drive device case 57 are butted against each other.

[0003] The details of the three-plane mating portion thus generated will be described with reference to FIG. FIG. 7 is a partially enlarged view of a portion C in FIG. As shown in FIG. 7, the cylinder head 52 is connected to the cylinder block 5 via a gasket 59.
3 is placed on the upper surface. The end portion 59a of the gasket 59 is provided slightly shorter so as not to protrude from the three-plane mating portion.

On the other hand, between the cylinder head 52 and the cylinder block 53 and the drive device case 57, for example, F
A liquid gasket 60 made of IPG (in-situ molded gasket) is interposed. And these gaskets 59
The cylinder head 52, the cylinder block 53 and the drive device case 57 are mutually sealed by the liquid gasket 60.

[0005]

As shown in FIG. 7, the corners of the cylinder head 52 and the cylinder block 53 are provided at the corners of the cylinder head 52 and the cylinder block 53 at the time of machining. 53a may occur. In addition, when the cylinder head 52 and the cylinder block 53 are assembled together, a step h as shown in FIG. 7 may occur due to an error in manufacturing. Then, such processing burrs 52a and 53a
When the step h is generated, the processing burrs 52a and 53a may cut the liquid gasket 60 at the same three-faced portion due to vibration or heat variation generated in the engine body during operation of the engine. When the liquid gasket 60 is cut in this way, oil leakage occurs at the three-face mating portion, and the sealing performance is greatly reduced.

The present invention has been made in view of the above circumstances, and an object of the present invention is to appropriately maintain the sealing performance of a three-plane mating portion even when a processing flash or a step occurs in the three-plane mating portion. An object of the present invention is to provide a seal structure of a three-face mating portion that can be formed.

[0007]

In order to achieve the above-mentioned object, according to the present invention, there are provided a first and a second member which are assembled in a layered manner with each other, and a liquid gasket at an end of the two members. A sealing structure of a three-face mating portion configured to have a third mounting member that is mounted via
A relief groove is provided on the surface of the third assembly member facing the joint of the first and second members along the joint of the first and second members, and The gist of the invention is that the liquid gasket is filled in the joint surface between the attaching member and the first and second members including the relief groove.

According to the first aspect of the present invention, the third assembling process can be performed even if the above-mentioned processing burrs or steps occur at the joining end portions of the first and second members, that is, at the corners thereof. Upon joining with the member, the processing burrs and steps are absorbed by the relief groove. Therefore, the liquid gasket filled in the relief groove will not be cut off even when vibration or thermal variation occurs in the three-plane mating portion by these members.

According to a second aspect of the present invention, in the sealing structure of the three-face mating portion according to the first aspect, the relief groove has a catch groove for preventing leakage of the liquid gasket filled in the groove. The main point is to be composed.

According to the second aspect of the present invention, even when a negative pressure acts on the liquid gasket in the relief groove, the leakage (pulling out by the negative pressure) is suitably prevented by the engaging groove. You.

According to a third aspect of the present invention, in the sealing structure of the three-face mating portion according to the first or second aspect, at least one end of the relief groove has the first and second members of the third assembly member. The gist of the present invention is to extend in such a manner as to terminate within the joint surface with the member.

According to the third aspect of the present invention, even when a pressure difference occurs between the inside and the outside of the first and second members and the third assembly member, the pressure difference is reduced within the relief groove. Since it does not affect the liquid gasket, the liquid gasket can be more effectively prevented from leaking (pulling out).

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment in which a three-face mating portion sealing structure according to the present invention is applied to an engine body will be described in detail with reference to FIGS.

FIG. 1 shows an overview of the engine body 1. As shown in FIG. 1, the engine body 1 includes an oil pan 4, a cylinder block 3 mounted on the upper surface of the oil pan 4, and integrally formed by a block 5 and a lower case 6, and a cylinder mounted on the upper surface of the cylinder block 3. The drive unit case 7 that covers the side surfaces (the right end in FIG. 1) of the head 2, the cylinder head 2 and the cylinder block 3, and the head cover 8 that is placed on the upper surfaces of the cylinder head 2 and the drive unit case 7 are assembled together. It is configured. Here, the oil pan 4 is provided as a tank for collecting and storing engine oil after splattering or circulating inside the engine. Further, the cylinder block 3 is integrally formed by mainly combining a plurality of cylinders in which pistons reciprocate inside. Further, the cylinder head 2 is provided as a lid of the cylinder block 3 at the head of the cylinder, and is also provided with an engine valve gear and the like. A drive device case 7 that simultaneously covers the side surfaces of the cylinder head 2 and the cylinder block 3 is provided as a cover of a drive device for transmitting the rotational force of a crankshaft provided inside the cylinder block 3 to a valve gear of an engine. ing. Also,
A head cover 8 is provided as an upper surface cover of the cylinder head 2 and the drive device case 7 provided as described above. In the engine body 1, for example, a cylinder head 2, a cylinder block 3 (lower case 6)
In addition, a three-face mating portion is formed at a portion A in FIG. 1 where the three mounting members of the drive device case 7 are butted together.

Next, the detailed structure of the three-plane mating portion thus configured will be described in detail with reference to FIGS.
FIG. 2 is a partially enlarged view of a portion A in FIG. 1 and shows the details of the three-plane matching portion. 3 is a left side view of the drive device case 7 of FIG. 1 taken along line 3-3, and FIG. 4 is a partially enlarged view of a portion B in FIG.

As described above, the cylinder head 2, the cylinder block 3, and the drive device case 7 are abutted against each other to form a three-plane mating portion. Then, as shown in FIG. 2, a gasket 9 is sandwiched between the cylinder head 2 and the cylinder block 3. The end 9a of the gasket 9 is provided to be slightly shorter so as not to protrude into the three-plane mating portion. The cylinder head 2 and the cylinder block 3 are fastened and fixed by a plurality of bolts (not shown).

On the other hand, as shown in FIG. 2, a liquid gasket 10 made of, for example, FIPG (field molded gasket) is interposed between the cylinder head 2 and the cylinder block 3 and the drive device case 7. Then, the cylinder head 2, the cylinder block 3, and the drive device case 7
Both are fastened and fixed by a plurality of bolts (not shown).

Here, in the present embodiment, as shown in FIG. 2, a relief groove 21 is provided at a position facing the three-faced portion of the drive device case 7. The relief groove 21 has a width W larger than the width of the mating surface of the cylinder head 2 including the gasket 9 and the cylinder block 3 and the cylinder head 2 and the cylinder block 3.
Processing burrs 2a, which may occur when processing
3a and a depth D sufficient to cover a step h which may occur due to an assembly error between the cylinder head 2 and the cylinder block 3. Further, as shown in FIGS. 3 and 4, the relief groove 21 is configured to have a predetermined length L1 vertically from the outer side surface of the drive device case 7. This length L1 is shorter than the width L of the mating surface of the drive device case 7. That is, the relief groove 2
1 is provided so as not to divide the mating surface of the drive device case 7. Further, an inner end of the relief groove 21 is a catch groove 21a having a predetermined length L2 on one side along the side surface. The liquid gasket 10 fills the entire relief groove 21 including the catch groove 21a, and is applied along the mating surface of the drive device case 7, so that the cylinder head 2 and the cylinder block 3 and the drive device case 3 7 is interposed.

Next, the operation of the sealing structure of the three-face mating portion configured as described above will be described. As described above, the relief groove 21 has a width W larger than the width of the mating surface between the cylinder head 2 including the gasket 9 and the cylinder block 3 and a processing that may occur when the cylinder head 2 and the cylinder block 3 are processed. Caelibari 2a, 3a
In addition, it is provided so as to have a depth D sufficient to cover a step h which may be caused by an assembly error between the cylinder head 2 and the cylinder block 3. Therefore, the influence of the processing burrs 2a, 3a and the step h due to the vibration and heat variation generated in the engine body 1 during the operation of the engine is absorbed by the relief groove 21, so that the cutting of the liquid gasket 10 is preferably prevented. become.

The escape groove 21 is provided in a key shape by a hooking groove 21a at the inner end of the escape groove 21.
The liquid gasket 10 is filled according to this shape. Therefore, even when a negative pressure is applied to the relief groove 21 at the time of, for example, an airtightness test, the liquid gasket 10 is preferably prevented from coming off (leakage) from the relief groove 21 due to the hook of the key. Is done.

Further, since the relief groove 21 is provided so as not to divide the mating surface of the drive device case 7, the pressure difference between the inside and the outside of the engine body 1 is reduced.
It is not transmitted to 0. Therefore, the liquid gasket 10 is also properly prevented from coming off (leaking) from the relief groove 21 due to such a pressure difference.

The liquid gasket 10 in the relief groove 21
Is open to the outside of the engine body 1, that is, to the atmosphere side, so that it comes into direct contact with the air, so that the liquid gasket 10 can be easily dried.

As described in detail above, according to the present embodiment, the following effects can be obtained. The cutting of the liquid gasket 10 can be suitably prevented even when processing burrs or steps occur on the mating surface with the drive device case 7.

[0024] For this reason, it is possible to suitably maintain the sealing property of the three-face mating portion. The liquid gasket 10 can be prevented from coming off (leaking) from the relief groove 21 due to a negative pressure, a pressure difference or the like.

The drying of the liquid gasket 10 can be facilitated. The present embodiment can be modified as follows. In the present embodiment, the shape of the relief groove 21 including the catch groove 21a is provided in a key shape. On the other hand, as shown in FIG. 5, the shape of the relief groove 21 is provided so as to have a predetermined length L1 perpendicularly from the outer side surface. May be provided in a T shape so as to have a length L3. In this case, the catch of the liquid gasket 10 can be made stronger.

In this embodiment, the catch groove 2
The shape of the relief groove 21 including 1a was provided in a key shape along the side surface. On the other hand, an appropriate shape for preventing the liquid gasket 10 from coming out of the escape groove 21 may be used. Further, the catch groove 21a is not necessarily required.

In the present embodiment, the seal structure in the three-face mating portion of the engine body 1 is embodied. However, as long as the three assembling members abut against each other, the present invention is applied to other than the engine body. The present invention can be similarly applied to a sealing structure having a different shape.

In this specification, means, members and the like according to the constitution of the present invention are defined as follows. The liquid gasket is for a molded gasket such as paper, cork, rubber, etc., and has a greater sealing effect than a molded gasket and can be used in various shapes. Generally, a room temperature vulcanization type silicone rubber sealant is used.

[0029]

According to the first aspect of the present invention, even if the aforementioned processing burrs or steps occur at the joining ends of the first and second members, that is, at the corners thereof, the third assembly is performed. Upon joining with the member, such processing burrs and steps are absorbed by the relief groove. Therefore, the liquid gasket filled in the relief groove will not be cut off even when vibration or thermal variation occurs in the three-plane mating portion by these members.

According to the second aspect of the present invention, even when a negative pressure acts on the liquid gasket in the relief groove, the leakage (pulling out by the negative pressure) is suitably prevented by the catch groove. .

According to the third aspect of the present invention, even when a pressure difference occurs between the inside and the outside of the first and second members and the third assembling member, the pressure difference is reduced within the relief groove. Since it does not affect the liquid gasket, the liquid gasket can be more effectively prevented from leaking (pulling out).

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a three-face mating portion sealing structure of the present invention applied to an engine body.

FIG. 2 is a partially enlarged view of a portion A in FIG.

FIG. 3 is a side view of the drive device case taken along the line 3-3 in FIG. 1;

FIG. 4 is a partially enlarged view of a portion B in FIG. 3;

FIG. 5 is a partially enlarged view showing another configuration example of the relief groove.

FIG. 6 is a side view showing a conventional seal structure of a three-face mating portion applied to an engine body.

FIG. 7 is a partially enlarged view of a portion C in FIG. 6;

[Explanation of symbols]

2 ... Cylinder head, 3 ... Cylinder block, 7 ... Drive device case, 9 ... Gasket, 10 ... Liquid gasket,
21: escape groove, 21a: catch groove.

Claims (3)

[Claims] 1. A three-plane mating part comprising two members, a first member and a second member, which are assembled to each other in a layered manner, and a third assembly member which is assembled to the ends of the members via a liquid gasket. Wherein a relief groove is provided on a surface of the third assembly member facing the joint of the first and second members along the joint of the first and second members. And a joint surface between the third assembly member and the first and second members is filled with the liquid gasket including the relief groove, and a three-face mating portion sealing structure. 2. The seal structure for a three-face mating portion according to claim 1, wherein the relief groove has a catch groove for preventing leakage of a liquid gasket filled in the groove. The sealing structure of the three-face mating part. 3. The sealing structure for a three-face mating portion according to claim 1, wherein at least one end of the relief groove has a joint surface of the third assembly member with the first and second members. A seal structure for a three-face mating portion, wherein the seal structure is extended in a manner to terminate inside.