JPH0332766Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an intake manifold gasket interposed between an intake port portion of a cylinder head of an engine and an intake manifold.

[Prior Art] As is well known, an intake manifold for air intake is attached to the cylinder head of an engine of an automobile or the like with bolts or the like. The cylinder head is constantly subject to vibration due to engine rotation, and this vibration is easily transmitted to the intake manifold. Furthermore, since an intake air passage is formed between the intake port portion of the cylinder head and the intake manifold, a shield is also required to prevent gas from flowing from the joint surface.

Therefore, it has been common practice to interpose a gasket made of plate-shaped rubber on the joint surface between the cylinder head and the intake manifold to prevent the transmission of vibrations and to serve as a gas shield.

However, when this plate-shaped rubber gasket is used, as the intake manifold repeatedly vibrates, the mounting position of the gasket tends to shift in the shearing direction, which reduces the vibration-proofing and gas-shielding effects. .

Therefore, a method has been proposed in which a gasket groove is formed on the mounting flange surface of the intake manifold, and a rubber gasket is embedded in the gasket groove to provide shielding. However, the intake manifold has a complicated shape, and depending on the model, it is necessary to cut the gasket groove with an end mill, which increases production costs.

Therefore, the present applicant previously proposed a gasket for mounting an intake manifold as shown in Japanese Utility Model Application Publication No. 102065/1983.

As shown in FIG.
When installing the intake port 2 of cylinder head 1.
A step 3 is formed in the opening, and a ring 4 is attached to this step 3.
A rubber gasket is inserted between the ring 4 and a stepped portion formed on the intake manifold 5, and the intake manifold is attached with bolts 8.

However, according to this technique, since the gasket is held between the stepped portions, displacement due to vibration can be completely prevented, but it is still necessary to form stepped portions on both the cylinder block and the intake manifold. This increases the number of processing steps and makes it difficult to standardize parts.

Furthermore, Japanese Utility Model Application Publication No. 57-107944 discloses a thin intermediate metal plate in which gasket parts made of an elastic material such as rubber are attached to both sides of the metal plate. However, in this known technique, there is a gasket part in the through hole of the stud bolt, so there is no problem in inserting the bolt. However, in the case of a gasket that seals the end peripheral surface of the intake manifold, it is not necessary to provide the gasket around the bolt insertion hole. Further, in this known technique, the intake manifold is supported via a spring in order to prevent vibrations from being transmitted through the bolts, and therefore cannot provide sufficient support.

[Problems to be Solved] Therefore, an object of the present invention is to facilitate the installation work in a gasket having a bolt insertion hole for installation on the outside of the gasket portion. To provide a plate-shaped intake manifold gasket for vibration isolation.

[Means for Solving the Problems] According to the present invention, in the intake manifold gasket interposed between the intake port portion of the cylinder head and the intake manifold, the metal plate around the intake passage opening of the thin intermediate metal plate A gasket portion made of an elastic material such as rubber is provided on both sides of the gasket portion, and an intake manifold mounting bolt insertion hole is formed in the portion of the intermediate metal plate that extends outward from the gasket portion. Stoppers are provided on both sides between the gasket portion and the mounting bolt insertion hole.

[Explanation of the function and effect of the invention] Therefore, although the point of intervening between the cylinder head and the intake manifold is the same as in the conventional example, simply providing an outwardly extending portion does not solve the problem.
During installation, that part bends and hangs downward, so the position of the bolt insertion hole is slightly shifted from the position of the mounting bolt, making it difficult to insert the mounting bolt. However, in the present invention, the bolt insertion hole is supported in the correct position by the stopper provided on both sides in the middle, and as a result, the mounting bolt, especially the sleeve whose diameter is almost the same as the bolt insertion hole, can be easily inserted, improving work efficiency. do. Further, since the bolt insertion hole is formed in the outwardly extending portion of the metal plate, no tightening force is directly applied to the elastic material such as rubber by the bolt when tightening the bolt, and no partial distortion occurs in the elastic material. Further, by adopting a structure in which a metal plate is sandwiched between the gaskets, the shear rigidity of the gaskets is increased, and it is possible to prevent the occurrence of shear deviations due to vibrations of the intake manifold.

[Examples] Examples of the present invention will be described below with reference to the drawings.

An embodiment of a gasket to which the present invention is applied is shown in FIGS.
It has a structure in which it is sandwiched from both sides in the shape of a sandwich. The intermediate metal plate 12 is, for example, about 0.4 mm thick, and gasket rubber is hot-glued on both sides of the plate. Various shapes can be considered for the shape of the gasket to match the shape of the intake manifold, but in this embodiment, it is shaped to match the shape of the substantially square intake hole 16. metal plate 1
Portions extending outward are formed on both longitudinal sides of 2, and bolt insertion holes 15 for attachment are provided in these portions.

FIG. 1 shows the installation state of this gasket 11. When installing the intake manifold 21 to the cylinder head 20 of the engine, the gasket 11 is interposed between both sides, and the manifold 21 is attached to the cylinder head 20 with bolts 22. stick. At that time, a positioning sleeve 25 is inserted between the bolt and the bolt insertion hole 15 of the gasket,
Vibration isolation is achieved by interposing a grommet 24 and a flat washer 23 between the manifold and the bolt head.

In the outwardly extending portion of the intermediate metal plate 12 of the gasket, protruding rubber stoppers 17 and 18 are provided on both sides of the metal plate 12 between the bolt insertion hole 15 and the gasket portion. This stopper 1
7 and 18 cooperate with the positioning collar to position the outwardly extending portion and fix the gasket 11 in a fixed position, thereby improving the vibration damping effect.

[Effects of the invention] As described above, the present invention has a flat plate shape like conventional gaskets, so there is no need to perform any processing on the cylinder head or intake manifold side, and the gasket is made of elastic material such as rubber. Since a metal plate is sandwiched between the gaskets, it is possible to prevent the gasket from shifting in the shearing direction, and to maintain the gas leakage prevention and vibration damping effects. In particular, the stopper allows the outwardly extending portion to be reliably positioned and facilitates the installation work.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the mounting state of a gasket embodying the present invention, FIG. 2 is a perspective view showing an embodiment of the present invention, and FIG. 3 is a cross-sectional view showing a conventional gasket mounting structure. 11...Gasket, 12...Intermediate metal plate, 1
3, 14... Gasket part, 15... Bolt insertion hole, 17, 18... Stopper, 20... Cylinder head, 21... Intake manifold, 2
2... Bolt, 23... Washer, 24... Grommet, 25... Color.

Claims (1)

[Scope of utility model registration request] In an intake manifold gasket interposed between the intake port part of the cylinder head and the intake manifold, a gasket part made of an elastic material such as rubber is installed on both sides of the metal plate around the intake passage opening of the thin intermediate metal plate. An intake manifold mounting bolt insertion hole is formed in a portion of the intermediate metal plate that extends outward from the gasket portion, and a connection between the gasket portion and the mounting bolt insertion hole in the outwardly extending portion of the intermediate metal plate is formed. A vibration-isolating intake manifold gasket characterized by having stoppers on both sides between them.