JPH0138286Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a laminated cylinder head gasket.

(Prior Art) Conventionally, as an example is shown in FIG. 1, a cylinder head gasket 3 interposed between a cylinder body 1 and a cylinder head 2 is partially shown in a plan view in FIG. As shown in the cross-sectional view taken along the line in FIG. 2, the gasket is of a laminated type, and the portion that abuts the upper end of the cylinder liner 4 (see FIG. 1) is formed as a bore grommet 5. The portion other than the water hole grommet 6, oil hole grommet 7, and push rod hole grommet 8 is defined as a non-sealed portion 9.

Further, a lower plate 10, a middle plate 11, an upper plate 12, and a bead plate 1 provided between the lower plate 10 and the middle plate 11.
3, 14, etc., and the middle plate 11 is 11A,
It is a set of 2 sheets of 11B.

(Problem to be solved by the invention) Such a conventional stacked cylinder head gasket 3 has a bead 1 under the bore grommet 5.
3A and 14A are formed, but no bead is formed in the non-sealed part 9, and the middle plate 11 is formed as 11A, 14A.
Due to the structure of the two plates 11B and the thickness accuracy of the middle plates 11A and 11B, it is inevitable that a small gap (0.05 to 0.1 mm) will be created between the upper plate 12 and the middle plate 11. I was getting used to it. Therefore, when fixing the cylinder head 2 with a stud bolt (not shown) on the cylinder body side inserted into the bolt hole 16, a surface pressure difference occurs between the bore grommet 5 and the non-sealed part 9, and the axial force of the bolt Even if the design allows the non-sealed portion to share the required percentage of This causes the upper plate 12 to vibrate in the vertical direction, a so-called "knocking" phenomenon, which impairs the gas sealing function and also causes a reduction in the service life of the gasket.

(Means for Solving the Problems) Based on the above-mentioned viewpoint, the present invention provides a gasket for a cylinder head that makes it possible to ensure surface pressure in the non-sealed part, and has a bore grommet and a non-sealed part. In this cylinder head gasket, which has a laminated structure consisting of a bead plate, a middle plate, an upper plate, etc., small cross-shaped radial beads are protruded and scattered throughout the middle plate in the non-sealed portion.

(Function) By protruding cross-shaped small beads with relatively low rigidity over the entire middle plate in the non-sealed part, the minute gap between the upper plate and the middle plate is eliminated in the small bead portion, and the upper plate To make the surface pressure of the bore grommet part and the non-sealed part as equal as possible without deforming it by pressing strongly.

(Example) An example of the present invention will be described in detail with reference to the drawings.

It is a plan view with a part cut out from Fig. 4, and also Fig. 5.
Each figure shows an embodiment of the gasket of the present invention in an enlarged sectional view along the line in FIG. 4.

The gasket 17 of the present invention has a first appearance shape.
Although the gasket 3 is the same as the conventional gasket 3 shown in FIGS. 3 to 3, the cross-sectional structure is shown in FIG.
Bead plates 13, 14, middle plate 18, and upper plate 12
Cross radial small beads 19 shown in an enlarged plan view in FIG. If so, the non-sealed part 9
The thickness of the middle plate 18 should be
0.1~0.15mm or small bead 1
A slit is provided at the top of the small bead 9 to make it relatively small in rigidity.
The height (0.05~
0.1mm).

Since the gasket 17 of the present invention has the above structure, even if there is a slight difference in the tightening force when attaching the cylinder head 2 to the cylinder body 1 as shown in FIG. The minute gap between the plate 12 and the middle plate 11 no longer exists,
Furthermore, by forming the small beads 19 in a cross-radial shape and having relatively low rigidity, the contact area of the non-sealed portion 9 with the top plate 12 is minimized, and the pressing force against the top plate 12 is also minimized. As a result, the upper plate 12 is not strongly pressed and deformed, and further,
By scattering the small beads 19, the non-sealed portion 9 is always evenly pressed over the entire surface, thereby making the entire surface pressure uniform.

(Effects of the invention) As is clear from the above explanation, the gasket of the invention can be interposed between the cylinder body and cylinder head with uniform surface pressure, does not cause deformation, and maintains a reliable gas seal for a long period of time. It has an excellent advantage that it can be maintained for a long time.

[Brief explanation of the drawing]

Fig. 1 is a partial longitudinal cross-sectional view showing an example of the use of a cylinder head gasket, Fig. 2 is a plan view showing a part of a conventional gasket, Fig. 3 is an enlarged sectional view of the portion lined in Fig. 2, and Fig. 4 The figure is a plan view showing a part of the gasket of the present invention, FIG. 5 is an enlarged sectional view of the portion taken along the line in FIG. 4, and FIG. 6 is an enlarged plan view of a small bead in the middle plate. DESCRIPTION OF SYMBOLS 1... Cylinder body, 2... Cylinder head, 3... Conventional gasket, 4... Cylinder liner, 5... Bore grommet, 9... Non-sealing part, 17... Gasket of the present invention, 18... Book The middle plate of the devised gasket, 19...small bead.

Claims (1)

[Scope of utility model registration request] In a cylinder head gasket that has a bore grommet and a non-sealing part and has a laminated structure consisting of a bead plate, a middle plate, an upper plate, etc., small cross-radial beads are scattered throughout the middle plate in the non-sealing part. Gasket for cylinder head.