JPH0454380A - Gasket - Google Patents

Abstract

PURPOSE:To improve trailability of a seal ring against expansion of a seal objective member by providing a reinforced member with a ring main body part and a plural number of projected parts projecting outward from it. CONSTITUTION:This head gasket 1 is interposed between a cast iron made cylinder block 2 and an aluminium alloy made cylinder head 3. A metal made reinforced member 12 is installed on a seal ring 9. The reinforced member 12 is constituted of a main body part 13 in a ring which is smaller in diameter than the inner diameter of the seal ring 9 and a plural number of projections 14 extending straight outward in the radial direction from the main body part 13. Then, the main body part 13 is arranged in the inner part of the seal ring 9 and head end parts of each of the projections 14 are buried in the inner peripheral part of the seal ring 9. Consequently the buried amount of the reinforced member into the seal ring is small, and consequently, it is possible to surely prevent cracking on the same seal ring for the improvement of trailability of the seal ring against the expansion of a seal objective member.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a head gasket that is interposed between a cylinder block and a cylinder head of an internal combustion engine, for example, and that prevents fluids such as water and oil from leaking to the outside. This relates to gaskets such as

[Prior Art] Conventionally, as a head gasket interposed between a cylinder block and a cylinder head of an internal combustion engine, there is one disclosed, for example, in Japanese Utility Model Application Publication No. 55-170446. As shown in FIGS. 7 and 8, this helad gasket has a gasket body 32 with a through hole 31 for fluid passage.
and a rubber seal ring 3 attached to the same flow hole 31.
3, and an annular reinforcing member 34 embedded in the inner peripheral portion of the seal ring 33. The reinforcing member 34 is for preventing the seal ring 33 from deforming significantly, and is made of metal.

[Problems to be Solved by the Invention] By the way, when the internal combustion engine is operated, water temperature, oil temperature, etc. rise, and the cylinder block 35, cylinder head 36, etc. become hot and thermally expand. At this time, the cylinder block 35
In an internal combustion engine in which the cylinder head 36 is made of cast iron and the cylinder head 36 is made of aluminum alloy, the amount of thermal expansion differs depending on the quality of the painting material. Then, a shearing load acts on the gasket body 32 sandwiched between the cylinder block 35 and the cylinder head 36 in the direction shown by arrow A. This shear load is
3, and as a result, the seal link 33 tends to deform.

However, in the prior art, the reinforcing member 34 is embedded all around the inner periphery of the seal ring 33, and the amount of deformation of the seal ring 33 is largely restricted by the reinforcing member 34. Therefore, if a shearing load greater than the amount that can deform the seal ring 33 itself is applied to the seal ring 33, the seal ring 33 will not be able to follow the shear load and will crack, causing fluid such as oil to leak from the same area. There is a risk of injury.

This invention was made in view of the above-mentioned circumstances, and its purpose is to improve the ability of a seal ring to follow the expansion of members to be sealed, such as cylinder blocks and cylinder heads, and to prevent cracks from occurring in the seal ring. The objective is to provide a gasket that can prevent this.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a gasket in which an annular seal ring is provided in the circulation hole through which fluid passes, and a reinforcing member is embedded in the seal ring. The member includes an annular main body disposed inside the seal link, and a plurality of projections protruding outward from the main body and embedded in the seal ring.

[Function] In the present invention, the reinforcing member includes an annular main body and a plurality of protrusions projecting outward from the main body, and only the protrusions are embedded in the seal ring. In this case, the amount of the reinforcing member buried is smaller than in the prior art in which the reinforcing member is buried all around the inner circumference of the seal ring. Therefore, the restraining force of the reinforcing member on the seal ring is reduced, the degree of freedom of deformation of the seal ring, that is, the maximum amount by which the seal ring itself can be deformed is increased, and the ability to follow the expansion of the member to be sealed is improved.

[Embodiment] Hereinafter, an embodiment in which the present invention is applied to a helad gasket for an internal combustion engine will be described with reference to FIGS. 1 to 4.

FIG. 3 is a plan view of the Herad gasket 1, and FIG. 4 is a partial cross-sectional view showing the installed state of the Herad gasket 1. This head gasket 1 has a cast iron cylinder block 2 and an aluminum alloy cylinder head 3. It is designed to be interposed between

A gasket body 4, which occupies most of the head gasket 1, is formed into a horizontally long plate shape. The gasket body 4 is provided with bolt insertion holes 5, blow-by gas distribution holes 6, oil supply holes 7, oil return holes 8, etc., which correspond to the cylinder block 2 and cylinder head 3. Among these, the blow-by gas flow hole 6, the oil supply hole 7, and the oil return hole 8 constitute a fluid flow hole, and a rubber seal ring 9 is attached to each of the flow holes.

Each seal ring 9 serves to prevent fluid F such as oil passing through the passage 10 of the cylinder block 2 and cylinder head 3 from leaking to the outside. Since the configuration of the seal ring 9 is basically the same,
Hereinafter, only the seal ring 9 attached to the oil return hole 8 will be explained.

The oil return hole 8 is circular, and the seal ring 9 is correspondingly formed in an annular shape.

An annular groove 11 is formed on the outer peripheral surface of the seal ring 9 over the entire circumference.
is formed, and the annular groove 11 is fitted into the inner circumferential surface of the oil return hole 8, thereby locking the seal ring 9 to the gasket body 4.

When the seal ring 9 is attached, both upper and lower surfaces of the gasket body 4 and upper and lower surfaces of the seal ring 9 are substantially flush with each other.

As shown in FIGS. 1 and 2, the seal ring 9 has different thicknesses at its outer and inner circumferences, with the inner circumference being thinner. A reinforcing member 12 made of metal is attached to this seal ring 9.

The reinforcing member 12 includes an annular body portion 13 having a smaller diameter than the inner diameter of the seal ring 9, and a plurality of protrusions 14 extending straight outward in the radial direction from the body portion 13. In this embodiment, eight protrusions 14 are integrally formed with the main body 13 at equal intervals. The main body portion 13 is disposed in the inner portion of the seal ring 9, and the tip of each protrusion 14 is embedded in the inner peripheral portion of the seal ring 9.

Next, the operation of this embodiment configured as described above will be explained.

When an internal combustion engine is operated, both water and oil temperatures rise, and the heat causes the cylinder block 2 and cylinder head 3 to rise.
It becomes hot and expands thermally. Since the cylinder block 2 and the cylinder head 3 are made of different materials, the amount of thermal expansion between them is different, and as a result, the head gasket 1 is
A shearing load acts in the direction shown by .

In this embodiment, the reinforcing member 12 includes an annular body portion I3 and a plurality of projections 14 extending radially outward from the body portion 13.
Only the protrusion 14 is embedded in the inner circumference of the seal ring 9. The buried amount of these protrusions 14 is
The number of reinforcing members 34 is smaller than that in the prior art in which the reinforcing members 34 are embedded all around the inner circumference of the seal ring 33. Therefore, the restraining force of the reinforcing member 12 on the seal ring 9 is reduced, and the degree of freedom of deformation of the seal ring 9, that is, the maximum amount by which the seal ring 9 itself can be deformed is increased, and followability is improved.

Therefore, even if a large shearing load is applied to the seal link 9 due to thermal expansion of the cylinder block 2 and cylinder head 3 as described above, the seal ring 9 can absorb the shearing load within its own allowable deformation. stop and transform. Therefore, even if a shearing load based on the difference in the amount of thermal expansion is applied to the seal link 9, the seal ring 9 can follow the shearing load and the fluid F such as oil will not leak out to the outside without cracking. There is no risk of it happening.

By the way, if the main body part I3 is omitted and the reinforcing member 12 is composed of only the plurality of protrusions j4, will the seal ring 9 be able to follow the thermal expansion of the cylinder block 2 and the cylinder head 3 better? It may remain in a deformed state. However, in this embodiment, since the plurality of protrusions 14 are interconnected by the annular main body 13, a force acting on the deformed seal ring 9 to return it to its original shape is exerted by the main body 13. That is,
When the operation of the internal combustion engine is stopped and the cylinder block 2 and cylinder head 3 are cooled, the seal ring 9, which has been deformed based on the difference in thermal expansion amount as described above, returns to its initial shape.

In addition, when the reinforcing member 12 is composed of only a plurality of protrusions 14, the followability of the seal ring 9 is improved and it can be deformed greatly, but in this case, the corners of the protrusions 14, etc. There is a risk of scratches and cracks starting from this point. However, in this embodiment, since the plurality of protrusions 14 are interconnected by the annular main body 13 as described above, large deformation of the seal ring 9 is restrained, and cracks in the seal ring 9 caused by the protrusions 14 themselves are prevented. is prevented.

It should be noted that the present invention is not limited to the configuration of the embodiment described above, and may be modified without departing from the spirit of the invention, for example, as described below.

(1) The number of protrusions 14 on the reinforcing member 12 is not limited to eight, but may be changed to four, six, eight or more depending on the material of the seal ring, etc.

(2) The protrusion 14 of the reinforcing member 12 has a shape having a disk 14a at the tip as shown in FIG. 5, or a shape having a long plate 14b extending in the circumferential direction at the tip as shown in FIG. It may be.

(3) The shape of the main body 13 of the seal ring 9 is not limited to an annular shape, and may be changed as appropriate depending on the shape of the communication hole to be installed. For example, in the case of a communication hole or a blow-by gas communication hole 6, Section 13 is made into a square ring shape.

[Effects of the Invention] As detailed above, according to the present invention, the reinforcing member embedded in the seal ring or the annular main body disposed inside the seal ring and the reinforcing member protruding outward from the main body , and a plurality of protrusions embedded in the seal ring,
The amount of the reinforcing member buried in the seal ring is small, so the ability of the seal ring to follow the expansion of the member to be sealed can be improved, and it is possible to reliably prevent cracks from forming in the seal ring. .

[Brief explanation of the drawing]

1 to 4 show an embodiment embodying the present invention, FIG. 1 is a partially cutaway perspective view of a seal ring and reinforcing member, and FIG. 2 is a plan view of the seal ring and reinforcing member. ,
Figure 3 is a plan view of the Herad gasket, Figure 4 is a partial sectional view showing the Herad gasket interposed between the cylinder block and the cylinder head, and Figures 5 and 6 are separate sections of the reinforcing member. 7 and 8 show the prior art, FIG. 7 is a plan view of the seal ring and reinforcing member, and FIG. 8 shows a gasket interposed between the cylinder block and the cylinder head. FIG. In the figure, 8 is an oil return hole as a circulation hole, 9 is a seal ring, 12 is a reinforcing member, 13 is a main body, 14 is a protrusion, F
is a fluid. Patent applicant Toyota Motor Corporation agent Patent attorney Hironobu Onda (and 1 other person) Fig. Fig. Fig. ■ Fig. Fig.

Claims (1)

[Claims] 1. An annular seal ring is provided in the circulation hole through which the fluid passes,
In the gasket in which a reinforcing member is embedded in the seal ring, the reinforcing member includes an annular main body disposed inside the seal ring, and a plurality of annular main body parts protruding outward from the main body part and embedded in the seal ring. A gasket characterized by comprising a protrusion.