JPH0322542Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a metal laminated gasket having a throttle hole.

[Prior art]

For example, the cylinder block and cylinder head of an engine are provided with fluid passages for cooling water, lubricating oil, etc. It is known to provide holes in the surfaces with openings for the fluid passages and to provide gaskets between the two parts to prevent fluid from escaping from the mounting surfaces.

Incidentally, the cylinder block and cylinder head are not normally manufactured for each engine specification, but are made compatible with engines of a certain range of specifications in order to reduce manufacturing costs. In this case, it is generally required to change the flow rate of cooling water and lubricating oil and the distribution to each part of the engine depending on the engine specifications. However, since cylinder blocks and cylinder heads are generally made by casting, it is extremely difficult to regulate the amount of water flowing through holes that serve as flow paths for cooling water and the like.
Therefore, it has been conventional practice to adjust the flow rate by narrowing the flow path at the portion where these fluids pass through the gasket.

For example, a metal plate with a throttle hole is applied from both sides to a liquid hole in an asbestos-metal plate composite gasket, and the throttle hole is connected with an eyelet and fixed to the gasket to form a throttle hole. Conventional restrictor hole forming means have drawbacks such as troublesome assembly work. Therefore, the idea of Japanese Utility Model Application Publication No. 61-197355 is to install eyelet-shaped metal plates from both sides of the liquid hole in the asbestos-metal plate composite gasket in which the throttle hole is provided, and to attach them to each other by press working. A means for forming an eyelet-like aperture is proposed in which the aperture is engaged and provided in one of the plates.

[The problem that the idea aims to solve]

However, the idea disclosed in the above-mentioned publication has the disadvantage that the number of parts is large and the number of assembly steps is increased.

By the way, when the gasket in which the throttle hole is provided is a metal laminated gasket, a stack of multiple thin metal plates of about 0.2 mm, such as stainless steel, is usually used in order to give the metal plate a sealing function. do. Therefore, if a throttle hole for fluid such as cooling water or lubricating oil is provided in these thin plates, the force from the fluid that extends from the tightened part to the opening and acts on the part that restricts the flow of fluid will be reduced. There is a problem in that the thin plate is deformed and the sealing performance is deteriorated.

Therefore, the present invention was developed by focusing on the above problems, and the metal plate is not deformed by the force due to fluid resistance caused by contracted flow, and the sealing performance does not deteriorate after long-term use. The object of the present invention is to provide a metal laminated gasket with a throttle hole.

[Means to solve the problem]

In order to achieve the above object, the structure of the metal laminated gasket with a throttle hole of the present invention is to provide a stepped part recessed in the shape of a flat bottom dish on the outside of the hole to be sealed, and to provide a throttle hole in the dish-shaped part. a metal plate, a metal plate having a bead for the aperture surrounding the periphery of the aperture, a grommet that clamps from both sides at least a portion of the metal plate where the bead for the aperture is provided, and an outer side of the dish-shaped portion. The metal plate is provided with a surrounding bead, and the bead is formed into a wavy shape.

In the metal laminated gasket of the present invention, the metal plate provided with the bead for the hole to be sealed and the metal plate provided with the bead for the throttle hole may be the same metal plate.

[Effect]

The dish-shaped portion acts to reinforce the strength of the portion of the member to be sealed in which the throttle hole is protruded into the hole, and the sealing performance of the bead provided around the hole.

Furthermore, the grommet cooperates with the bead for the throttle hole to prevent fluid from entering from the laminated portion around the throttle hole, and also increases rigidity by bundling the metal plate portion that protrudes into the hole through which the fluid passes. It acts to prevent deformation.

The stepped portion provided around the dish-shaped recess provided in the upper plate has a thin shape so that when applying a break-in load after assembling the gasket, there is no interference between the grommet part and the device that applies the load. In addition, when the metal laminated gasket is tightened during use, the stepped portion is compressed and acts as an auxiliary bead, and also acts to improve the sealing performance of the grommet portion.

〔Example〕

The present invention will be described in detail below with reference to an embodiment applied to a cylinder head gasket with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view of a main part of a metal laminated gasket with a throttle hole according to the present embodiment, and FIG. 2 is a partial plan view of FIG. 1.

As shown in Fig. 2, the metal laminated gasket (hereinafter simply referred to as gasket) 1 with a throttle hole of this embodiment has a tightening bolt hole Hb arranged around a cylinder bore Hc, a hole Hw for cooling water, and a hole Hw for lubricating oil. hole
Ho, push rod hole Hp, etc. are penetrated. Note that the dotted line around each hole indicates that a bead is provided. Further, Hwo in the figure indicates a cooling water hole portion provided with a throttle hole Hs, which will be explained in detail below.

The portion provided with the throttle hole Hs will be explained with reference to the sectional view shown in FIG. The gasket 1 is attached to the upper plate 2, the first
It consists of a bead plate 3, a middle plate 4, a second bead plate 5, a lower plate 6, and a grommet 7, and is shown disposed between a cylinder head 8 and a cylinder block 9 without applying any tightening force. The throttle holes Hs are defined by cooling water passages 10 provided in the cylinder head 8 and the cylinder block 9, respectively.
The flow path of the cooling water is narrowed in that part to limit the flow rate or to adjust the amount distributed to each cooling part.

Now, the bead 11 that seals the cooling water passage 10
are provided on the first bead plate 3 and the second bead plate 5, as shown in the figure, and are arranged to face each other with the intermediate plate 4 in between. And the throttle hole of the second bead plate 5
A bead 12 for a throttle hole is provided around Hs.

A stepped portion 14 forming a dish-shaped recess 13 provided in the upper plate 2
are provided along the outside of the cooling water passage 10.
Therefore, when it is fixed with a bolt (not shown), this portion is compressed and acts as an auxiliary bead.

The grommet 7 provides the shape of the throttle hole Hs, and also prevents cooling water from entering the laminated portion of the upper plate 2, middle plate 4, second bead plate 5, and lower plate 6.
Furthermore, the plates 2 to 6 are bundled together to prevent them from being deformed by the pressure of flowing water when passing through the throttle holes.

Next, a modification of the above embodiment will be explained with reference to FIGS. 3 and 4. These figures are used for the same parts as in Figure 1, and Figure 3 is for the same parts as Figure 1.
The bead 12 for the throttle hole is the same metal plate 15 as the bead 11.
An intermediate plate 16 is disposed between the bead 11 and the upper plate 2 to further widen the sealing width by the bead 11. FIG. 4 shows a bead for the throttle hole provided on the lower plate 6.

As described above, there is no particular limitation on the metal plate on which the drawing hole bead 12 and the bead 11 for sealing the hole 10 of the present invention are provided. Note that terms such as the upper plate, middle plate, lower plate, etc. It will be easily understood that these are used to facilitate understanding, and are not intended to limit the mounting position, mounting order, etc. Further, the number of thin metal plates used in the metal laminated gasket of the present invention is not limited, and can be increased or decreased as necessary without changing the present invention.

[Effect of idea]

As explained above, the metal laminated gasket with a throttle hole according to the present invention is constructed, so that the following effects can be obtained.

In other words, the stepped portion provided on the outside of the hole to be sealed is
It is compressed to the joint surface to form an auxiliary seal, and can also cooperate with the corrugated bead for the throttle hole and the grommet to reinforce the metal plate of the throttle hole. Further, the periphery of the throttle hole is sealed in cooperation with the grommet, and fluid can be prevented from entering between the laminated plates. Therefore, it is possible to provide a metal laminated gasket with an orifice that can withstand the deformation force due to the fluid resistance of the fluid passing through the orifice, even though it is made of a thin metal plate.

[Brief explanation of the drawing]

1 is a cross-sectional view of a main part of a metal laminated gasket with a throttle hole according to an embodiment, and FIG. 2 is a partial plan view of FIG. 1.
FIGS. 3 and 4 are sectional views of main parts of different embodiments, respectively. 1...Metal laminated gasket (gasket),
2... Upper plate (metal plate), 3... First bead plate (metal plate), 5... Second bead plate (metal plate), 7... Grommet, 11... Bead, 12... For drawing hole Bead, 13... dish-shaped part, Hs... throttle hole.

Claims (1)

[Scope of utility model registration request] a metal plate provided with a stepped part recessed in the shape of a flat-bottomed dish on the outside of the hole to be sealed, and a throttle hole provided in the dish-shaped part; a metal plate having a bead for the throttle hole surrounding the periphery of the throttle hole; The metal plate has a grommet that sandwiches the portion of the metal plate with the aperture bead provided thereon from both sides, and a metal plate provided with a bead surrounding the outside of the dish-shaped portion, and the bead is formed into a wavy shape. Metal laminated gasket with hole.