JP2606527Y2 - Laminated metal gasket - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated metal gasket mounted between an engine cylinder head and a cylinder block.

[0002]

2. Description of the Related Art Generally, a metal gasket for hermetically sealing a combustion chamber is mounted between a cylinder block and a cylinder head of an engine. The metal gasket includes a bead plate made of an elastic metal plate, and a sub-plate superimposed on the bead plate. An opening is formed in a portion of the bead plate and the sub-plate corresponding to the cylinder hole of the engine, and the bead plate is formed. An annular bead projecting to the opposite side to the sub-plate is formed in the vicinity of the opening peripheral portion of the sub-plate, and a folded-back portion (hereinafter, referred to as a “folding portion”) folded back so as to embrace the opening peripheral portion of the bead plate at the opening peripheral portion of the sub-plate. When the cylinder head is fastened to the cylinder block with a plurality of cylinder head fixing bolts, the load acting near the opening of the metal gasket is applied to the stopper and the corresponding peripheral edge of the bead plate. A laminated metal gasket configured to restrict abnormal displacement of a bead is widely used.

[0003]

In the above-described laminated metal gasket, since the stopper portion is usually uniform in width and thickness, the stopper portion or the corresponding cylinder at the peripheral edge of the opening of the bead plate is required. The surface pressure against the block increases toward the bolt insertion hole through which the cylinder head fixing bolt is inserted, and the inner wall of the cylinder hole near top dead center is partially deformed inward, resulting in a true circle of the cylinder hole. As a result, there is a problem that engine performance is reduced and oil consumption is increased due to a decrease in sealing performance between the cylinder hole and the piston ring. In particular, in the vicinity of the top dead center of the cylinder hole, in order to seal the high-temperature and high-pressure combustion gas in the compression stroke and the explosion stroke of the engine, even a slight decrease in roundness significantly reduces the engine performance, The problem of increased oil consumption occurs.

An object of the present invention is to provide a laminated metal gasket capable of uniformly setting the surface pressure on the peripheral portion of the opening of a cylinder hole and preventing the roundness of the cylinder hole from decreasing near the top dead center. is there.

[0005]

According to a first aspect of the present invention, there is provided a laminated metal gasket having a plurality of gasket constituting plates arranged in a laminated manner, each of which has an opening corresponding to a cylinder hole of an engine. A multi-layer metal gasket formed with a plurality of bolt insertion holes through which a plurality of cylinder head fixing bolts are inserted, and as a gasket component plate, an annular bead is formed near the opening peripheral edge of the opening. A stopper having a bead plate made of an elastic metal plate having a flat annular extending portion formed between the peripheral edge of the opening and the bead, and a stopper portion having a portion near the peripheral edge of the opening folded back at a position corresponding to the annular extending portion; At the position corresponding to the plate and the stopper, only one side is
And a spacer plate integrally formed with an annular receiving portion that is formed in a stepped shape across and has a thickness at least near the bolt insertion hole thinner than other portions.

[0006] Here, as in claim 2 wherein a is the preferred embodiment and the child configuration thinner toward the wall thickness of the annular receiving portion into the bolt insertion hole side.

[0007]

In the laminated metal gasket according to the first aspect, a laminated metal gasket is formed by laminating a bead plate, a stopper plate, and a spacer plate and joining them with rivets or the like. And, by mounting this laminated metal gasket between the cylinder head and the cylinder block and fastening the cylinder head between the cylinder blocks with the cylinder head fixing bolts, the laminated metal gasket is sandwiched between the cylinder head and the cylinder block, The combustion chamber is hermetically sealed via the bead.

On the other hand, a flat annular extending portion is formed between the peripheral edge of the opening of the bead plate and the bead, and a stopper formed by folding the vicinity of the peripheral edge of the opening at a position corresponding to the annular extending portion of the stopper plate. Part is formed, and only one surface side is covered over the entire circumference at the position corresponding to the stopper part of the spacer plate.
An annular receiving portion is formed in a step-down shape, and at least the thickness near the bolt insertion hole is made thinner than other portions. When the cylinder head fixing bolt is fastened, the annular extending portion and the stopper are formed. The part of the stopper plate facing the stopper part and the annular receiving part are sandwiched between the cylinder head and the cylinder block, and near the bead, the bead is formed from the thickness of the stopper part plus the thickness of the annular receiving part. Is formed by subtracting the thickness of the spacer plate corresponding to the above, and the abnormal displacement of the bead is regulated by this gap. In addition, since the thickness of the annular receiving portion is configured to be thin near the bolt insertion hole, the surface pressure of the laminated metal gasket on the cylinder block near the bolt insertion hole at the periphery of the opening of the cylinder hole should be set low. And the roundness of the cylinder hole near the top dead center can be improved. Moreover, paragraphs only one surface
Since the annular receiving portion is formed in the spacer plate on the spacer plate, the annular receiving portion can be easily formed on the spacer plate by press molding or the like.

When the thickness of the annular receiving portion is made thinner toward the bolt insertion hole, the surface pressure of the laminated metal gasket against the cylinder block is reduced by the peripheral pressure of the opening of the cylinder hole. The uniformity can be set over the entire circumference of the portion, and the roundness of the cylinder hole near the top dead center can be further improved .

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The present invention is a case where the present invention is applied to a laminated metal gasket mounted on a cylinder block and a cylinder head of a V-6 engine.

As shown in FIGS. 1 and 2, three cylinder holes 2 are formed in the left and right banks 1A and 1B of the cylinder block 1 of the V-type engine, respectively.
B, a pair of cylinder heads 4 is fixed by mounting cylinder head fixing bolts (not shown) in eight bolt holes 3 respectively formed in the upper part thereof.
A laminated metal gasket 10 is mounted between the left and right banks 1A and 1B of the cylinder block 1 and a piston 5 is mounted in the cylinder hole 2 via a plurality of piston rings 6 so as to be airtightly slidable. A combustion chamber 7 formed by the cylinder block 1 and the cylinder head 4 is held in an airtight state via a laminated metal gasket 10 and a plurality of piston rings 6.

The left and right laminated metal gaskets 10 are:
As shown in FIGS. 3 to 5, the upper and lower bead plates 20 and 30 made of a pair of elastic metal plates, and a spacer plate 40 and a stopper plate 50 provided between the upper and lower bead plates 20 and 30 are provided. Hole 2 of laminated metal gasket 10
An opening 11 and a bolt insertion hole 12 are respectively formed at positions corresponding to the bolt holes 3.

An annular bead 21 protruding downward is formed near the periphery of the opening 11 of the upper bead plate 20, and an annular protruding upward is formed near the periphery of the opening 11 of the lower bead plate 30. Are formed between the beads 21, 31 of the upper and lower bead plates 20, 30 and the periphery of the opening 11, respectively.

An annular annular receiving portion 41 is formed at a portion corresponding to the annular extending portion 22 of the spacer plate 40, and the upper surface of the annular receiving portion 41 is formed in a stepped shape over the entire circumference. The thickness of the annular receiving portion 41 is such that the thickness T1 (see FIG. 4) at the four locations closest to the four bolt insertion holes 12 surrounding the opening 11 is one wall thickness at the site of T2 that is configured to be thin as it goes to the set to be smaller than (see FIG. 5) four bolt insertion holes 12 side.

The stopper plate 50 includes a spacer plate 40.
Is folded back so as to embrace the opening peripheral portion of the annular receiving portion 41.
A stopper 51 extending upward is formed, the thickness of the stopper plate 50 is set to be larger than the maximum step amount of the annular receiving portion 41, and a flat annular pressure receiving portion is provided below the annular receiving portion 41 of the stopper plate 50. 52 are formed.

The operation of the laminated metal gasket 10 will be described. When the cylinder block 1 and the cylinder head 4 are fastened with eight bolts with the laminated metal gasket 10 mounted, the laminated metal gasket 10 is sandwiched between the cylinder block 1 and the cylinder head 4, and the annular receiving portion 41 and the stopper portion The thickness of the stopper portion 51 and the annular receiving portion 41 are reduced by sandwiching the annular receiving portion 51 and the annular pressure receiving portion 52 between the annular extending portions 22 and 32 of the upper and lower bead plates 20 and 30.
The gap obtained by subtracting the thickness of the spacer plate 40 corresponding to the bead 21 from the thickness obtained by adding the thickness of the beads 21 and 31 is
Bead 21, 3, 3
1 is regulated.

On the other hand, the surface pressure acting on the cylinder block 1 by fastening the cylinder head fixing bolt increases toward the bolt insertion hole 12, but the thickness of the annular receiving portion 41 surrounds the opening 11. The surface pressure in the vicinity of the opening edge of the cylinder hole 2 becomes substantially uniform over the entire circumference because the thickness is set thinner toward the bolt insertion hole 12 side. For this reason, the roundness of the cylinder hole 2 near the top dead center can be increased, and the sealing performance between the cylinder hole 2 and the piston 5 can be increased to improve engine performance and reduce oil consumption. It becomes possible.

Here, a modified example in which the configuration of the laminated metal gasket 10 is partially changed will be described. still,
The same members as those in the above embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

1) The laminated metal gasket 10 is
It may be configured as shown in FIG. That is, as shown in (a), the lower bead plate 30 of the laminated metal gasket 10 may be arranged so that the beads 31 project downward, or as shown in (b), The upper bead plate 20 of the gasket 10 may be arranged so that the bead 21 projects upward, and the lower bead plate 30 may be arranged so that the bead 31 projects downward, or as shown in FIG. Alternatively, the upper bead plate 20 of the laminated metal gasket 10 may be arranged such that the beads 21 protrude upward, and sub-plates 60 may be provided on both upper and lower sides of the upper and lower bead plates 20 and 30. Further, one of the bead plates 30 and 20 may be omitted, and the present invention can be applied to a laminated metal gasket having a configuration other than the above as long as the spacer plate 40 and the stopper plate 50 are provided. Applicable.

2) The spacer plate 40 and the stopper plate 50 may be configured as shown in FIG. That is,
As shown in (a), the lower surface side of the annular receiving portion 41 is stepped down by inverting the spacer plate 40, and the stopper plate 50
Is arranged on the lower surface side of the spacer plate 40, and the spacer plate 40
A stopper 51 may be formed by folding back the opening edge of the stopper plate 50 so as to embrace the opening edge of the stopper plate 50 and extending above the annular receiving portion 41, or as shown in FIG.
The spacer plate 40 is turned upside down so that the lower surface side of the annular receiving portion 41 is stepped down, the stopper plate 50 is arranged on the lower surface side of the spacer plate 40, and the annular pressure receiving portion 52 of the stopper plate 50 and the annular receiving portion of the spacer plate 40. The peripheral edge of the opening of the stopper plate 50 may be folded upward so that the stopper portion 51 is located between the stoppers 41, or as shown in FIG. Let the steps drop,
The stopper plate 50 may be arranged on the lower surface side of the spacer plate 40, the peripheral edge of the opening of the stopper plate 50 may be folded back, and the stopper portion 51 may be arranged below the annular pressure receiving portion 52.

3) The thickness of the annular receiving portion 41 is set uniformly to a thickness T1 over the entire circumference, and as shown in FIG. 8A, the upper surface of the annular receiving portion 41 or the stopper portion. A material having heat resistance and compression resistance is printed by pattern printing on the lower surface of 51 or the upper surface of the stopper portion 51 shown by a solid line in FIG. 8B or the lower surface of the annular pressure receiving portion 52 shown by an imaginary line in FIG. And a surface pressure adjusting member 61 whose thickness becomes thinner as it goes to the bolt insertion hole side, and the annular pressure receiving member 41 and the surface pressure adjusting member 61 reduce the surface pressure near the opening peripheral portion of the cylinder hole 2 over the entire circumference. May be set substantially uniformly.

4) As shown in FIG. 9, only the portion of the annular receiving portion 41 other than the region A shown by oblique lines separated from the four bolt insertion holes 12 is formed to be thin with a uniform thickness. Alternatively, the thickness of the annular receiving portion 41 may be set uniformly over the entire circumference, and the surface pressure adjusting member 61 having a uniform thickness may be provided in the region A.

5) The width of the surface pressure adjusting member 61 or the width W of the stopper portion 51 (see FIG. 4) becomes wider toward the bolt insertion hole 12 so that the cylinder hole 2 is formed.
May be set substantially uniformly over the entire circumference.

In this embodiment, the present invention is applied to the laminated metal gasket 10 mounted on the cylinder block 1 and the cylinder head 4 of a V-type six-cylinder engine. The present invention can be similarly applied to a cylinder engine and an in-line multi-cylinder engine. Further, the present invention can be similarly applied to an air pump and the like other than the engine.

[0025]

According to the laminated metal gasket of the present invention, the surface pressure of the laminated metal gasket against the cylinder block in the vicinity of the bolt insertion hole can be set low with a simple configuration, as described in detail in the section of the operation. The surface pressure of the laminated metal gasket against the cylinder block can be set uniformly over the entire periphery of the opening of the cylinder hole, thereby suppressing the deformation of the inner wall portion of the cylinder hole from being partially inward. Thus, the roundness of the cylinder hole near the top dead center can be improved. As described above, since the roundness of the cylinder hole near the top dead center can be improved, the sealing performance between the inner wall of the cylinder hole and the piston ring near the top dead center can be sufficiently ensured, and the engine performance can be improved. Oil consumption can be reduced.

Moreover, the annular receiving portion can be formed at the same time as press working such as punching of an opening into the spacer plate, and the manufacturing process of the laminated metal gasket does not become complicated. In addition, by press-molding, that Do is possible to greatly reduce the variation in the surface pressure against the cylinder block so it can be molded accurately annular receiving portion in the thickness direction.

[Brief description of the drawings]

FIG. 1 is a perspective view of a cylinder block.

FIG. 2 is a vertical cross-sectional view of a main part near the top dead center of the engine.

FIG. 3 is a plan view of a laminated metal gasket.

FIG. 4 is a sectional view taken along line IV-IV of FIG. 3;

FIG. 5 is a sectional view taken along line VV of FIG. 3;

FIG. 6 is a diagram corresponding to FIG. 4 of a laminated metal gasket according to a modification.

FIG. 7 is a view corresponding to a section taken along line IV-IV in FIG. 3 of a stopper plate and a spacer plate according to another modification.

FIG. 8 is a view corresponding to a section taken along line IV-IV in FIG. 3 of a stopper plate and a spacer plate having a surface pressure adjusting member.

FIG. 9 is an explanatory view showing a thin-walled area and a formation area of a surface pressure adjusting member of the annular receiving portion;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder block 1A bank 1B bank 2 Cylinder hole 3 Bolt hole 4 Cylinder head 5 Piston 6 Piston ring 7 Combustion chamber 10 Laminated metal gasket 11 Opening 12 Bolt insertion hole 20 Bead plate 21 Bead 22 Ring extension 30 Bead plate 31 Bead 32 annular extension portion 40 spacer plate 41 annular receiving portion 50 stopper plate 51 stopper portion 52 annular pressure receiving portion 60 sub plate 61 surface pressure adjusting member

Continuation of the front page (56) References JP-A-62-155375 (JP, A) JP-A-64-65367 (JP, A) JP-A-4-44456 (JP, U) JP-A-57-125746 (JP, A) , U) Japanese Utility Model Hei 1-141354 (JP, U) Japanese Utility Model Hei 2-91266 (JP, U) Japanese Utility Model Hei 3-119554 (JP, U)

Claims (2)

(57) [Scope of request for utility model registration] 1. A gasket component plate, comprising: a plurality of gasket component plates arranged in a stack; an opening is formed in each of the gasket component plates in correspondence with a cylinder hole of an engine; and a plurality of cylinder head fixing bolts are provided. A laminated metal gasket formed with a plurality of bolt insertion holes to be inserted, wherein an annular bead is formed near an opening periphery of the opening as the gasket component plate,
A stopper having a bead plate made of an elastic metal plate having a flat annular extending portion formed between the peripheral edge of the opening and the bead, and a stopper portion having the periphery of the opening folded back at a position corresponding to the annular extending portion. a plate, a position corresponding to the stopper portion, only one surface
And a spacer plate integrally formed with an annular receiving portion that is formed in a stepped shape over the entire circumference and has a thickness at least near the bolt insertion hole thinner than other portions. Laminated metal gasket. 2. The laminated metal gasket according to claim 1, wherein the thickness of the annular receiving portion is made thinner toward the bolt insertion hole side.