JP6880399B2 - gasket - Google Patents

Description

The present invention relates to a gasket, and more particularly to a gasket that seals between a water cooling adapter provided between a cylinder head and an exhaust manifold and the cylinder head.

Today, exhaust gas generated by an engine is discharged from a cylinder head via an exhaust manifold, and a gasket for sealing the exhaust gas is provided between the cylinder head and the exhaust manifold (Patent Document 1).
In recent years, for the purpose of protecting the catalyst provided in the muffler and improving fuel efficiency, it has been studied to cool the exhaust gas discharged from the cylinder head, and a water cooling adapter is provided between the cylinder head and the exhaust manifold to provide the cylinder head. It has been proposed to cool the exhaust gas emitted from.
The water cooling adapter includes an exhaust passage for circulating exhaust gas from the cylinder head to the exhaust manifold and a cooling water passage formed around the exhaust passage for circulating cooling water. A water supply port for supplying cooling water is provided in the cooling water passage of the water cooling adapter.

Japanese Unexamined Patent Publication No. 2013-76352

Here, in the above configuration, a gasket for sealing the exhaust gas is required between the cylinder head and the water cooling adapter, and a gasket for sealing the cooling water is also required between the water cooling adapter and the water supply port. Become.
However, when these gaskets are separated, there is a problem that the number of parts increases and these must be assembled separately when assembling the engine, which increases the assembly man-hours.
In view of such a problem, the present invention can simultaneously seal between the water cooling adapter and the cylinder head and between the water cooling adapter and the water supply port when the water cooling adapter is attached to the engine. It provides a gasket.

That is, the gasket according to the invention of claim 1 is a gasket that seals between the water cooling adapter provided between the cylinder head and the exhaust manifold and the cylinder head.
A first substrate having a first seal portion sandwiched between the cylinder head and the water cooling adapter and having an exhaust hole formed in accordance with the positions of the cylinder head and the exhaust passage formed in the water cooling adapter.
A second seal portion sandwiched between the water cooling adapter and a water supply port for supplying cooling water to the water cooling adapter, and a cooling water hole is formed according to the position of the cooling water passage formed in the water cooling adapter and the water supply port. And with a second substrate whose front and back surfaces are rubber coated
Further, a connecting portion for connecting the first substrate and the second substrate is provided at a position avoiding the sandwiched portion between the water cooling adapter and the cylinder head and the sandwiched portion between the water cooling adapter and the water supply port.
It is characterized in that the end portion of the first substrate and the end portion of the second substrate are connected in an overlapping state at the connection portion.

According to such a configuration, a first substrate having a first sealing portion for sealing between the cylinder head and the water cooling adapter, and a second having a second sealing portion for sealing between the water supply port and the water cooling adapter. By connecting the board with the connection portion, the number of parts can be reduced, and the number of assembly steps when assembling the engine can be reduced.
Further, by sealing the exhaust passage and the cooling water passage with one gasket connecting the first seal portion and the second seal portion, when the second seal portion is cooled by the cooling water, it is heated by the exhaust gas. The first seal portion can be cooled by the heat transfer effect.

FIG. 3 is a perspective view of an engine including a gasket according to this embodiment. Top view of the gasket. FIG. 2 is a cross-sectional view taken along the line III-III of FIG.

Hereinafter, the present invention will be described with reference to the illustrated examples. FIG. 1 shows a schematic view of a main part of an engine 1 for an automobile, in order to cool an exhaust gas between a cylinder head 2 and an exhaust manifold 3. The configuration in which the water cooling adapter 4 is provided is shown.
Further, the engine 1 of the present embodiment is provided with a water supply port 5 for supplying cooling water to the water cooling adapter 4 integrally with the cylinder head 2, and the water supply port 5 is provided with a water pump (not shown). Cooling water is being supplied.
On the side wall on the same side of the cylinder head 2, the first sealing surface 2a through which a plurality of exhaust passages Pe through which the exhaust gas generated in the engine 1 flows and the water supply port 5 are formed, and the cooling water is provided. A second sealing surface 5a through which the circulating cooling water passage Pc is opened is formed.
The first seal surface 2a and the second seal surface 5a are formed so as to project from other portions of the side wall of the cylinder head 2, and are provided at positions separated from each other, but are set at the same height.
In order to connect the water cooling adapter 5 and the exhaust manifold 3 to the cylinder head 2, one stud 6 is provided on the first seal surface 2a and two studs 6 are provided on the second seal surface 5a, and the first seal is provided. Bolt holes (not shown) into which bolts (not shown) are inserted are bored at other connecting positions on the surface 2a.

The water cooling adapter 4 has a substantially box shape, and has an exhaust passage Pe provided so as to penetrate from a surface facing the cylinder head 2 to a surface facing the exhaust manifold 3, and inside the water cooling adapter 4, although not shown. The surface of the water cooling adapter 4 provided with the cooling water passage Pc provided so as to surround the exhaust passage Pe on the side of the cylinder head 2 and the water supply port 5 is a flat surface on which the exhaust passage Pe opens. Although the 1 flange surface 4a and the flat second flange surface 4b with the cooling water passage Pc opened are formed, and the first flange surface 4a and the second flange surface 4b are provided at positions separated from each other. It is provided at the same height.
The first and second flange surfaces 4a and 4b formed on the water cooling adapter 4 overlap with the first and second sealing surfaces 2a and 5a formed on the cylinder head 2. A stud 6 provided in the cylinder head 2 and a bolt hole through which a bolt is inserted are provided.
By mounting the water cooling adapter 4 having the above configuration on the engine 1, when the exhaust gas generated in the engine 1 is discharged from the exhaust passage Pe of the cylinder head 2, it passes through the exhaust passage Pe of the water cooling adapter 4. After that, it flows into the exhaust manifold 3.
When the exhaust gas passes through the exhaust passage Pe of the water cooling adapter 4, the exhaust gas is supplied from the water supply port 5 and cooled by the cooling water flowing through the cooling water passage Pc. It will be cooled by passing through the exhaust passage Pe.
By cooling the exhaust gas in this way, it is possible to prevent the catalyst of the muffler provided on the downstream side of the exhaust manifold 3 from being damaged by the heat of the exhaust gas.

The present invention relates to a gasket 11 provided between the cylinder head 2 and the water cooling adapter 4 to seal the exhaust gas flowing through the exhaust passage Pe and the cooling water flowing through the cooling water passage Pc. There is. Here, FIG. 2 shows a plan view of the gasket 11, and FIG. 3 shows a cross section of parts III to III in FIG.
The gasket 11 is composed of metal first to fourth substrates B1 to B4, of which the first and third substrates B1 and B3 form a first seal portion S1 for sealing the exhaust passage Pe. The second and fourth substrates B2 and B4 form a second seal portion S2 that seals the cooling water passage Pc, and a connecting portion that connects the first seal portion S1 and the second seal portion S2. C is formed.
Specifically, the first seal portion S1 is composed of a sandwiched portion between the first seal surface 2a of the cylinder head 2 and the first flange surface 4a of the water cooling adapter 4, and similarly, the second seal portion S2 is described above. It is composed of a sandwiched portion between the second sealing surface 5a constituting the water supply port 5 in the cylinder head 2 and the second flange surface 4b of the water cooling adapter 4.
The connection portion C is provided at a position avoiding a sandwiched portion between the cylinder head 2 as the first and second seal portions S1 and S2 and the water cooling adapter 4, and when the engine 1 is assembled, the connection portion C is provided. C is exposed to the outside.

As shown in FIG. 1, the first substrate B1 and the second substrate B2 are overlapped with each other so that the second substrate B2 is located closer to the cylinder head 2 than the first substrate B1 in the connection portion C, and is conventionally known. It is connected by caulking.
Further, the third substrate B3 overlaps with the surface of the first substrate B1 on the cylinder head 2 side and is connected by caulking, and the end portion of the third substrate B3 does not overlap with the second substrate B2. It has become.
Further, the fourth substrate B4 overlaps with the surface of the second substrate B2 on the water cooling adapter 4 side and is connected by caulking, and the end portion of the fourth substrate B4 does not overlap with the first substrate B1. It has become like.
The first to fourth substrates B1 to B4 are each manufactured of a metal such as SUS and have the same plate thickness (for example, t = 0.5 mm), whereby the first substrate B1 and the third substrate B3 are obtained. The total plate thickness of the above is the same as the total plate thickness of the second substrate B2 and the fourth substrate B4.
Therefore, the first seal portion S1 that seals the exhaust passage Pe and the second seal portion S2 that seals the cooling water passage Pc have the same plate thickness, and the first and second seal surfaces 2a of the cylinder head 2 have the same plate thickness. Dimension control based on 5a becomes easy.

Exhaust holes 12 are formed in the first and third substrates B1 and B3 constituting the first seal portion S1 at the same positions as the exhaust passage Pe provided in the cylinder head 2 and the water cooling adapter 4. ..
Cooling water holes 13 are formed in the second and fourth substrates B2 and B4 constituting the second sealing portion S2 at the same positions as the cooling water passages Pc provided in the water supply port 5 and the water cooling adapter 4. ing.
Then, as shown in FIG. 3, a half bead 14 projecting toward the water cooling adapter 4 is formed around the exhaust hole 12 formed in the first substrate B1, and around the exhaust hole 12 of the third substrate B3. A half bead 14 projecting toward the cylinder head 2 is formed.
Similarly, a half bead 14 projecting toward the cylinder head 2 is formed around the cooling water hole 13 formed in the second substrate B2, and a water cooling adapter 4 is formed around the cooling water hole 13 in the fourth substrate B4. A half bead 14 projecting toward the surface is formed.
Further, as shown in FIG. 2, the gasket 11 is provided with bolt holes 15 through which studs 6 and bolts provided in the cylinder head 2 and the water supply port 5 are inserted at corresponding positions.

A rubber coating 16 for sealing the cooling water flowing through the cooling water passage Pc is formed on the second and fourth substrates B2 and B4 constituting the second sealing portion S2. At this time, since the ends of the second and fourth substrates B2 and B4 are located at the connecting portion C, the boundary of the rubber coating 16 is located at the connecting portion C.
The rubber coating 16 is applied to the entire front and back surfaces of the second and fourth substrates B2 and B4, so that partial coating is not required in the manufacturing process, and the application process of the rubber coating 16 is simplified. Can be done.
Further, since the first substrate B1 and the second substrate B2 are connected by caulking in an overlapping state, the rubber coat is removed from the second substrate B2 when the first substrate B1 and the second substrate B2 are connected. There is no need, and the manufacturing process can be simplified.
Further, in this embodiment, the second substrate B2 is provided on the cylinder head 2 side of the first substrate B1, and the fourth substrate B4 having a smaller area than the second substrate B2 is on the water cooling adapter 4 side of the second substrate B2. It is provided in.
That is, since the second substrate B2 having a wider area is located on the upstream side in the flow direction of the cooling water, the second substrate B2 can obtain a high cooling effect by the cooling water, and the second substrate B2 can be obtained. It is possible to prevent the rubber coating 16 formed in the above from being deteriorated by the heat of the exhaust gas as much as possible.
Then, the second substrate B2 is provided on the cylinder head 2 side of the first substrate B1, the third substrate B3 is closer to the cylinder head 2 than the first substrate B1, and the fourth substrate B4 is water-cooled than the second substrate B2. By providing the gasket 11 on the adapter 4 side, it is possible to suppress deformation when the gasket 11 of this embodiment is sandwiched between the water cooling adapter 4, the cylinder head 2, and the water supply port 5.

According to the gasket 11 having the above configuration, the first seal portion S1 and the second seal portion S2 are integrally configured by the connection portion C, so that one gasket 11 can be used for the exhaust passage Pe of the water cooling adapter 4 and the exhaust passage Pe. The cooling water passage Pc can be sealed at the same time.
Further, when the second seal portion S2 is cooled by the cooling water flowing through the cooling water passage Pc, the first seal portion S1 can be cooled via the connection portion C due to the heat transfer effect, and further, the first seal portion S1 can be cooled. Exhaust gas passing through the exhaust hole 12 of the 1-seal portion S1 can also be cooled.
Further, by forming the gasket 11 in which the first seal portion S1 and the second seal portion S2 are connected by the connection portion C, the number of parts of the engine 1 can be reduced and the assembly man-hours at the time of assembly can be reduced. It becomes possible.
In particular, even when only one stud 6 is provided on the first sealing surface 2a of the cylinder head 2 as in the present embodiment, the two studs provided on the second sealing surface 5a of the water supply port 5 are provided. By using 6, it becomes possible to position the gasket 11 by a plurality of studs 6.
On the other hand, when the gasket 11 composed of only the first seal portion S1 is to be assembled to the cylinder head 2, the position of the gasket 11 cannot be determined by one stud 6 on the first seal surface 2a. The operator must assemble the engine 1 while holding down the gasket 11. Further, since the gasket 11 composed of only the second seal portion S2 must be assembled to the water supply port 5, the work becomes complicated and the man-hours increase.

In the above embodiment, the first substrate B1 on which the first seal portion S1 is formed and the second substrate B2 on which the second seal portion S2 is formed are partially overlapped at the connection portion C located between them. For example, the first and second seal portions S1, S2 and the connection portion C are composed of a single substrate, and rubber is formed on the front surface and the back surface of the position to be the second seal portion S2. The coating 16 may be formed.
In this case, if two substrates having the same shape are laminated to form a rubber coating 16 on the portion to be the second sealing portion S2, a gasket 11 in which a plurality of substrates are laminated can be obtained as in the above embodiment. it can.

2 Cylinder head 3 Exhaust manifold 4 Water cooling adapter 5 Water supply port 11 Gasket 12 Exhaust hole 13 Cooling water hole 16 Rubber coating B1 to B4 1st to 4th boards S1 1st seal part S2 2nd seal part C Connection part Pe Exhaust passage Pc Cooling water passage

Claims (2)

A gasket that seals between the water cooling adapter provided between the cylinder head and the exhaust manifold and the cylinder head.
A first substrate having a first seal portion sandwiched between the cylinder head and the water cooling adapter and having an exhaust hole formed in accordance with the positions of the cylinder head and the exhaust passage formed in the water cooling adapter.
A second seal portion sandwiched between the water cooling adapter and a water supply port for supplying cooling water to the water cooling adapter, and a cooling water hole is formed according to the position of the cooling water passage formed in the water cooling adapter and the water supply port. And with a second substrate whose front and back surfaces are rubber coated
Further, a connecting portion for connecting the first substrate and the second substrate is provided at a position avoiding the sandwiched portion between the water cooling adapter and the cylinder head and the sandwiched portion between the water cooling adapter and the water supply port.
A gasket characterized in that the end portion of the first substrate and the end portion of the second substrate are connected in an overlapping state at the connection portion. In the connection portion, the second substrate is provided so as to overlap the cylinder head side with respect to the first substrate.
A third board is provided on the cylinder head side of the first board, and a fourth board is provided on the water cooling adapter side of the second board.
The gasket according to claim 1 , wherein the total thickness of the first substrate and the third substrate is the same as the total thickness of the second substrate and the fourth substrate.

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