JPH02120577A - Metal gasket - Google Patents

Abstract

PURPOSE:To secure the fixed composition plane space regardless of dimensional errors so as to facilitate the dimensional control and the manufacture of a metal gasket used for the sealing between members to be connected by means of a bead formed on a substrate made of an elastic metal plate in the state of surrounding a part to be sealed by providing a separate compensating plate of the fixed thickness to be laminated if requested. CONSTITUTION:In a metal gasket 2 performing the sealing between members to be connected by means of a bead 18 formed at a substrate 4 surrounding a part to be sealed, a sub-plate 6 of t2 thickness with a turned-up part 24 formed turning up the end edge 6e on the combustion chamber pore side toward the outside of the combustion chamber pore is laminated on a substrate made of an elastic metal plate of t1 thickness. A separate compensating plate 8 of t3 in the fixed thickness to be laminated if requested is provided at the metal gasket 2 thus laminated and constructed, and thereby the dimensional error of the members to connected is absorbed and compensated so as to secure the fixed composition plane space. The metal gasket is also used, for instance, for the sealing between the deck planes of the cylinder head and the cylinder block of an internal combustion engine.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a metal gasket, and more particularly to a metal gasket that can absorb and compensate for dimensional errors in members to be joined and that can ensure a predetermined gap between joint surfaces.

[Conventional technology]

Metal gaskets, which are used to seal the joining surfaces of parts to be joined, such as the seal between the deck surfaces of the cylinder head and cylinder block of internal combustion engines, are formed on a substrate made of an elastic metal plate in order to seal the sealing surfaces. The bead is elastically deformed by the fastening force of a bolt or the like that joins the members to be joined, and an elastic seal line is formed on the deck surface by the elastic restoring force and amount of elastic restoring during this elastic deformation. This achieves a seal between the deck surfaces and maintains the sealing effect by following the distortion of the deck surfaces.

[Problem that the invention seeks to solve]

By the way, as shown in FIGS. 6 to 9, in an internal combustion engine as a member to be joined, a crankshaft 38 is attached to a crank bearing 36 of a cylinder block 30 that is assembled to a cylinder with a 7F28.
The connecting rod 4 is pivotally supported on the crankshaft 38.
A piston 5 is provided at one end of the connecting rod 44 to be pivotally supported, and a piston 5 is provided at the other end of the connecting rod 44 so as to be able to reciprocate within the cylinder 56.
It supports 0. These are related parts that determine the compression ratio value of the internal combustion engine, and the dimensions of each part must be strictly controlled during manufacturing. That is, the cylinder block 30
The dimension ffl between the deck surface 30d and the center of the crank bearing 36, the dimension β2 between the center of the crank bin 40 of the crankshaft 38 and the center of the shaft portion 42, and the connecting rod 4
Dimension 13 between the center of the small end 46 and the center of the large end 48 of 4
, and the head top surface 52 of the piston 50 and the piston pin 5
It is necessary to strictly control the dimension 14 with respect to the center of 4.

However, these dimensions cause errors during manufacturing. Therefore, conventionally, regarding the metal gaskets that are inserted into the cylinder when assembling the cylinder head to the cylinder block, there are those with a standard thickness, those thicker than this base thickness, and those that are thicker than this standard thickness. By preparing metal gaskets of three different thicknesses, including a thin one, and inserting a metal gasket of an appropriate thickness between the cylinder head and cylinder block during assembly, dimensional errors can be absorbed and compensated for. A predetermined compression ratio value was obtained.

However, preparing metal gaskets of three different thicknesses in this way increases the number of manufacturing steps, resulting in a disadvantage in terms of cost and complicating dimensional control.

[Purpose of the invention]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a metal material that can absorb and compensate for dimensional errors in members to be joined and secure a predetermined joint surface gap, which is easy to manufacture, cost-effective, and easy to control dimensions. The purpose is to realize gaskets.

[Means for solving problems]

In order to achieve this object, the present invention provides a metal gasket that seals between members to be joined by a bead formed on a substrate made of an elastic metal plate to surround a sealing area, and absorbs dimensional errors of the members to be joined. The present invention is characterized by the provision of separate compensating plates of a predetermined thickness that are laminated as desired to ensure a predetermined bonding surface gap.

[Effect]

According to the configuration of the present invention, a metal gasket that performs a seal between the members to be joined has a predetermined thickness that is laminated as desired to absorb and compensate for dimensional errors of the members to be joined and to ensure a predetermined gap between the joining surfaces. By providing separate compensating plates, there is no need to prepare metal gaskets of three different thicknesses as in the conventional case.

〔Example〕

Embodiments of the present invention will be described in detail and specifically below with reference to the drawings.

1 to 5 show embodiments of this invention. In the figure, 2 is a metal gasket, 4 is a substrate, 6 is a sub-plate, and 8
is a separate compensation board.

The metal gasket 2 is provided by stacking sub-plates 6 of j thickness t2 on a substrate 4 made of an elastic metal plate having a thickness tl. The substrate 4 and the sub-plate 6 each have a combustion chamber hole 10, a plurality of bolt holes 12 through which fastening means such as bolts are inserted around the combustion chamber hole 10, an oil hole 14, and a cooling water hole 1.
6 mag. are formed respectively.

The substrate 4 includes a bead 18 surrounding the combustion chamber hole 10 and a hole bead 20 surrounding the bolt hole 12 and oil hole 14.
Further, an outer peripheral bead 22 and the like are formed at the outer peripheral edge of the substrate 4, which includes these beads 18 and 20. This board 4
As shown in FIG. 2, the sub-plate 6 stacked on the combustion chamber hole
The O side edge 6e is folded back to the outside of the combustion chamber hole 10 to form a folded part 24. By overlapping this folded portion 24 with the edge 4e of the substrate 4 on the combustion chamber hole 10 side, a compensating portion 26 having a predetermined thickness is provided.

In the metal gasket 2 constructed by laminating the sub-plate 6 on such a substrate 4, the above-mentioned separate compensating plate 8 is provided, which is laminated as desired. This compensating plate 8 has a thickness t3, and similarly to the base plate 4 and the sub-plate 6, a plurality of fastening means such as bolts are inserted into the combustion chamber hole 10 and around the combustion chamber hole 10. Bolt hole 12, oil hole 14, cooling water hole 1
6 mag. are formed respectively.

Further, in FIG. 1, reference numerals 28 and 30 indicate a cylinder head and a cylinder block, respectively, which constitute an internal combustion engine, and a metal gasket 2 and a If desired, another compensating plate 8 is interposed and fastened by fastening means. Note that the reference numeral 32 is a knock bottle, and the reference numeral 34 is a knock pin hole.

Next, the effect will be explained.

The metal gasket 2 interposed between the deck surfaces 28d and 30d of the cylinder head 28 and the cylinder block 30 is
The beads 18 to 22 are compressed by the fastening force of a fastening means such as a bolt inserted into the bolt hole 12, and each bead 18 to 22 is compressed and deformed with a reduced height.

Due to this deformation, each of the beads 18 to 22 is formed on each deck surface 28d and 3 of the cylinder head 28 and cylinder block 30.
0d to form a seal line and seal.

At this time, due to the fastening force of the fastening means, the cylinder head 28
is curved and distorted, and in particular, there is a problem that the gap between the deck surfaces 28d and 30d around the combustion chamber hole 10 becomes large. However, by providing the compensator 26 with a predetermined thickness, it is possible to compensate for the gap between the deck surfaces 28d and 30d, and the gap between the deck surfaces 28d and 30d due to the combustion pressure can be compensated for.
It is possible to prevent the gap d from expanding or contracting.

Therefore, it is possible to prevent combustion gas from leaking from the gap between the deck surfaces 28d and 30d, and to prevent the metal gasket 2 from being contaminated by the leaked combustion gas and from reducing the sealing effect due to the volume of the contained substance. Furthermore, it is possible to weaken the alternating load acting on the bead 18, prevent the bead 18 from becoming sagging, and extend its service life.It also prevents damage to the fastening means and the portion of the cylinder head 28 that the fastening means engages with. At the same time, it is possible to prevent a decrease in the fastening force and obtain a stable sealing effect.

In this way, in the metal gasket 2 that performs the sealing between the deck surfaces 28d and 30d, as shown in FIGS. Deck side 3 of block 30
The dimension I11 between 0d and the center of the crank bearing 36,
Dimensions between the center of the crank bin 40 and the center of the shaft portion 42 of the crankshaft 38! ! 2. Absorb and compensate for dimensional errors in the dimension 13 between the center of the small end 46 and the center of the large end 48 of the connecting rod 44, and the dimension e4 between the head top surface 52 of the piston 50 and the center of the piston pin 54. Predetermined deck surface 2
In order to ensure a gap of 8d and 30d, another compensating plate 8 having a predetermined thickness t3 is provided which is laminated as desired.

That is, when the separate compensating plate 8 is not laminated, a metal gasket 2 having a thickness TI=(tl+2xt2) can be obtained as shown in FIG. In addition, if one supplementary (award board 8) is laminated, the thickness T2 = (
tl+2Xt2+t3) metal gasket 2 can be obtained. Furthermore, when two separate compensating plates 8 are laminated, the thickness T3=(t 1 +2x
A metal gasket 2 of t2+2Xt3) can be obtained.

This eliminates the need to prepare three types of metal gaskets with different thicknesses as in the past in order to absorb and compensate for errors that occur during manufacturing and obtain a predetermined compression ratio value. This allows the unit to obtain metal gaskets 2 of three different thicknesses. Therefore, it is possible to eliminate the inconvenience of requiring a large number of manufacturing steps, and it is easy to manufacture, which is advantageous in terms of cost, and also facilitates dimensional control.

1. In the conventional gas getter made of flexible material, as shown in FIG. 5, the thickness t4 of the center part and the thickness of both sides (
5 (t4-t5) reaches 50 to 100 μm, it is necessary to prepare three types of gaskets with different thicknesses. However, in the metal gasket of the present invention, the difference (t4 -t5) is 5 to 10 μm, it may be sufficient to prepare two types of metal gaskets with different thicknesses.

(Effects of the Invention) As described above, according to the present invention, the metal gasket that performs the sealing between the members to be joined can be adjusted as desired to absorb and compensate for the dimensional error of the members to be joined and to ensure a predetermined gap between the joining surfaces. By providing separate compensation layers of a predetermined thickness that are laminated with each other, there is no need to prepare three types of metal gas gets with different thicknesses as in the prior art.

Therefore, it is possible to eliminate the inconvenience of a large number of manufacturing steps, and it is possible to realize a metal gas get that is easy to manufacture, advantageous in terms of cost, and whose dimensions are easy to control.

[Brief explanation of drawings]

Figures 1 to 5 show examples of the present invention, Figure 1 is a perspective view of the assembled state of the metal gas care), Figures 2 to 4 are sectional views showing examples of the assembly, and Figure 5 is It is a cross-sectional explanatory view showing the thickness of the metal gas get at the time of fastening. 6 to 9 are sectional views of a cylinder block, a crankshaft, a connecting rod, and a piston, which are related parts that determine the compression ratio value of the internal combustion engine, respectively. In the figure, 2 is a metal gasket, 4 is a substrate, 6 is a sub-plate, 8 is another compensation plate, 10 is a combustion chamber hole, 18, 20, 22 are beads, 26 is a compensation part, 28 is a cylinder head, 30 is a cylinder It is a block.

Claims (1)

[Claims] 1. In a metal gasket that seals between parts to be joined by a bead formed on a substrate made of an elastic metal plate to surround a sealing part, the dimensional error of the parts to be joined is absorbed and compensated to ensure a predetermined gap between the joining surfaces. A metal gasket characterized in that a separate compensating plate of a predetermined thickness is provided, which is laminated as desired.