JPS61255251A - Laminated metal gasket - Google Patents

Abstract

PURPOSE:To sufficiently absorb and compensate the strain by arranging the beads in symmetrical form with respect to the plate source of a subplate interposed between two basic plates and twice increasing the retaining quantity and retaining force of the bead, thus permitting the following to the difference of the surface pressure of the deck surface. CONSTITUTION:A laminated metal gasket 2 is constituted of two basic plates 8 which are made of elastic metal plate having a bead part 6 surrounding a combustion-chamber hole 4 and a subplate 10 interposed between said basic plates 8, and the beads 6 on the basic plates 8 are arranged in symmetrical form with respect to the plate surface of the subplate 10. The thickness t2 of the inner peripheral edge part of the hole 4 for combustion chamber is set larger than the thickness t1 of the bead 6a part on fastening, and in order to obtain this thickness t2, a glomet part 14 having the thickness t2 is formed on the inner peripheral edge part. Therefore, when a cylinder head 8 is fastened onto a cylinder block 20, the bead 6 is press-attached onto the deck surfaces of the cylinder head 18 and the cylinder block 20 with a prescribed surface pressure, and the superior sealing is permitted.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a laminated metal gasket for sealing between the deck surfaces of a cylinder head and a cylinder block, and in particular, to prevent irregularities in the deck surface gaps that occur when the cylinder head is fastened. The present invention relates to a laminated metal gasket 1- that can compensate and prevent a decrease in lηm and sealing effect of the gasket and achieve stable sealing.

[Prior Art] A metal gasket is used to seal the joining surface of the joined part +4, for example, the deck surface between the cylinder block and cylinder head of an internal combustion engine. The metal gasket has a bead formed to seal the sealing surface, and this bead is elastically deformed by the fastening force of a pole that joins the members to be joined together. The bead forms an elastic seal line on the deck surface by the restoring amount and restoring force during this elastic deformation to achieve sealing, and also maintains the sealing effect by following the strain.

[Problems to be Solved by the Invention] However, when the cylinder head is fastened to the cylinder block with a fastening bolt through a fully bent gasket, the cylinder head is distorted by the fastening force, resulting in uneven gaps between the deck surfaces. Therefore, there is a problem in that the deck surface gap especially around the combustion chamber becomes large.

As a result, the unevenness of the deck surface gap causes local differences in the surface pressure applied to the deck surface, making it difficult to follow the amount of restoration of the bead and the restoring force, resulting in a complete seal covering the entire circumference of the bead. There is an inconvenience that Noka's ID may be lost.

Furthermore, combustion gases may enter through the gaps between the deck surfaces around the combustion chamber, staining the metal gas get interposed between the joining members, and reducing the sealing effect by retaining the contained substances. There was an inconvenience in having to do so.

In addition, during use, as the gap around the combustion chamber increases or decreases due to combustion pressure, an alternating load acts on the bead 1 of the metal gasket, causing it to sag, and this alternating load causes the fastening bore It also worked in January and damaged the cylinder throat area where the bolt and hole l- engage.
Furthermore, there is the disadvantage that the tightening force of the bolt is reduced and the effect of the metal gas joint is reduced.

[Object of the Invention] Therefore, the object of the present invention is to eliminate the above-mentioned disadvantages, to compensate for the irregularity of the deck surface gap that occurs when the throat is fastened to the cylinder, and to prevent contamination of the gas container and a reduction in the sealing effect. +
l: 1. The object of the present invention is to realize a bonded metal gasket 1- that can achieve stable sealing.

[Means for Solving the Problems] In order to achieve this object, the present invention provides a base 15 formed of an elastic metal (inversely a flame 1; a base 15 surrounding the fU chamber hole).
A sub-plate is interposed between these two substrates, and the beats are arranged symmetrically with respect to the plate surface of the sub-plate to form a gasket, and the combustion of this gasket 1- It is characterized in that the inner peripheral edge of the chamber hole is equipped with a groove 1'' which has a thickness greater than the thickness of the beat portion at the time of compression fastening.

1 Effect] According to the structure of the present invention, the bead is arranged in the plate surface of the sub-plate interposed between the two substrates in the shape of the I L pattern and the first-person shape, so that the amount of restoration of the bead and the A restoring force is added (η).This allows the cylinder cock to follow the difference in surface pressure caused by the unevenness of the deck surface gap when the cylinder head is fastened to the cylinder cock, and can sufficiently absorb and compensate for the strain. .

In addition, the inner circumferential edge of the combustion chamber hole is equipped with a gasket (1) which has a thickness greater than the thickness of the bee F section during press-fitting, so that people around the combustion chamber cannot It is possible to prevent the combustion gas from entering through the deck surface gap and weaken the action of the alternating load on the bee 1-.

[Example code] Next, embodiments of the present invention will be described in detail based on the drawings.

1 to 3 show embodiments of this invention. In Figures 1 to 3, 2 is a laminated metal gasket, which is sandwiched between two substrates 8, 8 in which beats 6, 6 surrounding the combustion chamber hole 4 are formed on an elastic metal plate, and the substrates 8, 8. It consists of a Samurai 1 plate 10 provided as a base plate, and beads 6 and 6 of substrates 8 and 8 are arranged symmetrically with respect to the plate surface of this sub-plate 10.

The inner peripheral edge 12 of the combustion chamber hole 4 of this laminated metal gasket 2
The portion is thicker than the thickness tl of the bee 1'6a and 6a portions when fastened, and has a thickness L2 of, for example, 3/100 vavs culm. In order to make this thickness t2 appear, a grommet 14 having a thickness t2 is provided at the inner peripheral edge 12 of the combustion chamber hole 4.

In addition, in this embodiment, Grono-no-t-14 is used as sub-plate 10.
However, it is also possible to extend both the substrates 8, 8 toward the combustion chamber hole 4 side and attach them to both the substrates 8, 8.

Further, 16 is a bolt hole for fastening drilled in the metal gasket 2, 18 is a cylinder throat, and 20 is a cylinder block, and the cylinder throat 18 and cylinder block 20 are
The laminated metal gasket of the present invention is interposed between the deck surfaces of the cylinders, and the gaskets are fastened as shown in FIG. This is a gap between the cylinder block 20 and the combustion chamber side.

Next, the effect will be explained.

When the cylinder head 18 is fastened to the cylinder pro-lock 20 with a fastening bolt, the interposed laminated metal gasket 2 will be attached to the bead 6 when not fastened as shown by the solid line in FIG.
The height is reduced and deformed from 6 to the beads 6a and 6a at the time of press fastening shown by the broken line. With this transformation, BeF6
・6 is the cylinder hemometer (, 18 and cylinder block 2
It is pressed against the deck surface of o with a predetermined surface pressure to achieve a seal. At this time, even if the port fastening force causes distortion in the cylinder hemlock l518 and the gaps on the deck surface become uneven, the secondary plate 10
By arranging the heaters I"6 and 6 in a symmetrical shape with respect to the plate surface, both the restoring amount and the restoring force of the heaters 16 and 6 are doubled, so they can be sufficiently tracked to absorb irregularities in the void. It is possible to compensate for the damage and maintain the sealing effect.

In addition, due to the fastening force, the cylinder rod 18 is bent and distorted, as shown in FIG. There is a problem. However, the thickness of the fetal comet 14 is 12
As shown in FIG. 3, the cylinder head 18
It is possible to compensate for the gap S caused by the distortion of the .

This makes it possible to prevent combustion gas from entering through the gap S. Furthermore, the alternating load acting on the beads 1-6 and 6 is weakened by Grono 7 +-14, preventing the beads 6 and 6 from becoming sagging, and the
- It is possible to prevent damage to the engaged portion of the cylinder hem 1-18, and it is also possible to prevent a reduction in the fastening force of the fastening bolt, thereby preventing a reduction in the sealing effect.

[Effects of the Invention] As described above, according to the present invention, the bead is arranged symmetrically with respect to the plate surface of the sub-plate interposed between the two substrates of the laminated metal gasket, and the amount of restoration of the bead is reduced. and multiplying resilience. Thereby, the unevenness of the gap can be absorbed and compensated for by following the difference in surface pressure caused by the unevenness of the deck surface gap during fastening.

In addition, by attaching the block 1- which has a thickness slightly larger than the thickness of the bead part during press-fastening to the inner circumferential edge of the combustion chamber hole of the gasket t-, the cylinder solenoid 1- when press-fastened is installed. It is possible to compensate for the distortion of the inner circumferential edge of the combustion chamber hole due to the curvature of the hole, and to prevent combustion gas etc. from entering from this distorted part. It also prevents the metal gasket from being fouled by intruding combustion gas and from reducing the sealing effect due to the accumulation of contained substances. Furthermore, the alternating load acting on the bead is weakened to prevent the bead from sticking, thereby preventing damage to the fastening bolt and the cylinder head portion to which this bolt engages, and also preventing the fastening pole from being damaged. It is possible to prevent a decrease in force and obtain a stable sealing effect, which is advantageous in practice.

[Brief explanation of drawings]

1 to 3 show an embodiment of the laminated metal gasket 1- according to the present invention. FIG. 1 is a partially omitted plan view of the metal gasket 1-, and FIG. 2 is a plan view of the metal gasket 1- shown in FIG. FIG. 3 is an enlarged cross-sectional view of the main part along lines, and a partially omitted cross-sectional view of the main part when a metal gasket is interposed in the joint part. In the figure, 2 is a laminated metal gasket, 4 is a combustion chamber hole, 6 is a bead, 6a is a bead for fastening, 8 is a substrate, and 10
12 is an inner peripheral edge, 14 is a grommet, 18 is a cylinder head, 20 is a cylinder block, and 22 is a combustion chamber.

Claims (1)

[Claims] Two elastic metal plates each having a bead surrounding the combustion chamber hole are provided, a sub-plate is interposed between these two substrates, and the beads are arranged symmetrically with respect to the surface of the sub-plate. A laminated gasket is arranged to constitute a gasket, and a grommet having a thickness greater than the thickness of the bead portion at the time of press fastening is attached to the inner peripheral edge portion of the combustion chamber hole of the gasket. metal gasket.