JPH075323Y2 - Cylinder head gasket - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) A cylinder head gasket according to the present invention is sandwiched between an upper surface of a cylinder block and a lower surface of a cylinder head of an engine to maintain airtightness and liquid tightness between both surfaces. To use for.

(Prior Art) In order to maintain air-tightness and liquid-tightness between the upper surface of the cylinder block of the engine and the lower surface of the cylinder head, it is possible to prevent
A cylinder head gasket 8 as shown in FIGS. 8 to 8 is used.

The cylinder head gasket 8 includes a gasket sheet 3 formed by forming compound layers 2 and 2 on both front and back surfaces of a metal core material 1 such as an iron plate with a hook, and a bore hole 4 matching the opening shape of the cylinder top. 4, water oil holes 5 and 5 for passing cooling water or lubricating oil, and small holes 6 and 6 for inserting bolts for fixing the cylinder head to the cylinder block. There is.

Grommets 7, 7 made of a thin metal plate are attached to the peripheral portions of the bore holes 4 and 4 to increase the plate thickness of the peripheral portions of the bore holes 4 and 4, thereby increasing the upper surface of the cylinder block and the lower surface of the cylinder head. When the cylinder head gasket 8 is strongly sandwiched between and, it is ensured that the pressing force around the bore holes 4 and 4 becomes particularly large and the high pressure combustion gas generated in the cylinder leaks to the outside. To prevent.

Further, as shown in FIG. 8, a metal core material 9 and a core material 9 held by the core material 9 are held inside at least a part of the plurality of water oil holes 5, 5. A seal ring 11 composed of a seal material 10 such as rubber is fitted and the cylinder head gasket 8 is strongly sandwiched between the upper surface of the cylinder block and the lower surface of the cylinder head. The material 10 is elastically compressed between the two surfaces so that the lubricating oil flowing through the water oil hole 5 is surely prevented from leaking from the outside.

(Problems to be Solved by the Invention) However, in the case of the engine having the conventional cylinder head gasket constructed as described above and used, there were the following problems.

That is, an engine incorporating a cylinder head is provided with an oil pump for supplying a lubricating oil for lubricating each part such as a camshaft, which is bolted to a cylinder block. A liquid sealant (which solidifies over time after application) is applied between the cylinder block and the cylinder block to prevent leakage of lubricating oil from the joint surface between the oil pump and the cylinder block. There is.

In this way, if the sealing material applied to the joint surface between the opil pump and the cylinder block squeezes out to the inside of the oil pump, the squeezed-out portion will be torn and become a rubber piece.
It mixes with the lubricating oil and is sent out from the oil pump together with this lubricating oil.

Since an oil filter is provided in the engine's lubricating oil system, the rubber piece is usually collected by this oil filter, and there is no particular problem. May not be collected by the oil filter and may be sent into the engine.

That is, the oil filter installation portion is provided with a relief valve for preventing the hydraulic pressure at this installation portion from rising excessively. If the viscosity of is extremely high, it may open (until the oil temperature rises) even if there is no particular malfunction.

While the relief valve is open, the lubricating oil is sent to each part of the engine without passing through the oil filter, so if a rubber piece happens to be sent at this time, this rubber piece will remain inside the engine. It will be sent up to.

Inside the engine, there is a flow passage with a relatively small cross-sectional area in the part that lubricates the cam shaft provided inside the cylinder head.Therefore, when a relatively large rubber piece is fed, the flow passage of the lubricating oil If the oil is clogged and the supply of lubricating oil becomes insufficient, the engine may seize in extreme cases.

The cylinder head gasket of the present invention eliminates the above-mentioned inconvenience by having a structure capable of preventing the rubber pieces mixed in the lubricating oil from being sent to the cylinder head.

(Means for Solving the Problems) The cylinder head gasket of the present invention is similar to the above-described conventional cylinder head gasket, in that a sheet-like gasket sheet is provided with a bore hole matching the opening shape of the cylinder top and cooling water or Is provided with a water oil hole for passing lubricating oil and a small hole for inserting a bolt, and a metal core material is provided inside at least a part of the water oil hole among the water oil holes. It is configured by fitting a seal ring composed of a seal material held on the core material.

Furthermore, in the cylinder head gasket of the present invention,
A plate-shaped member having a plurality of small through holes is provided inside the seal material that constitutes the seal ring.

(Operation) In the case of the cylinder head gasket of the present invention configured as described above, the lubricating oil fed into the lubricating oil passage provided inside the cylinder head is provided with a plurality of small through holes provided in the plate member. Is sent to the lubricating oil passage only.

The flow passage area of each of the plurality of small through holes is sufficiently smaller than the area of the lubricating oil flow passage, and the total flow passage area of all the small through holes is equal to or larger than the area of the lubricating oil flow passage. Therefore, it is possible to ensure that a rubber piece that is large enough to block the lubricating oil flow passage is sent to the lubricating oil flow passage provided inside the cylinder head without increasing the resistance to the lubricating oil supply. Can be prevented.

(Embodiment) Next, the present invention will be described in more detail with reference to the illustrated embodiment.

1 and 2 show a first embodiment of the present invention. FIG. 1 is a perspective view showing a seal ring to be incorporated in a cylinder head gasket, and FIG. 2 is a part of the cylinder head gasket. It is sectional drawing of the part which assembled the ring.

Like the conventional cylinder head gasket described above, the cylinder head gasket 8 of the present invention has two or more compound layers 2, 2 on both sides of the metal core material 1 such as an iron plate with a hook as shown in FIGS. In the gasket sheet 3 formed by forming the
And water oil holes 5 and 5 for passing cooling water or lubricating oil, and small holes 6 and 6 for inserting bolts for fixing the cylinder head to the cylinder block. ,
Grommets 7, 7 made of a thin metal plate are attached to the peripheral portions of the bore holes 4 and 4 to increase the plate thickness of the peripheral portions of the bore holes 4 and 4, thereby increasing the upper surface of the cylinder block and the lower surface of the cylinder head. When the cylinder head gasket 8 is strongly sandwiched between the cylinder head gasket 8 and the cylinder head, the pressing force around each of the bore holes 4 and 4 becomes particularly large, and the high pressure combustion gas generated in the cylinder is surely leaked to the outside. I am trying to prevent it.

Further, as shown in FIG. 8, a metal core material 9 and a core material 9 held by the core material 9 are held inside at least a part of the plurality of water oil holes 5, 5. A seal ring 11 composed of a seal material 10 such as rubber is fitted and the cylinder head gasket 8 is strongly sandwiched between the upper surface of the cylinder block and the lower surface of the cylinder head. The material 10 is elastically compressed between the two surfaces so that the lubricating oil flowing through the water / oil holes 5 is surely prevented from leaking to the outside.

However, in the case of the cylinder head gasket 8 of the present invention, the core material 9 is formed into a disk shape, and the sealing materials 10 and 10 are used.
Are attached to portions of the disc-shaped core material 9 near the outer peripheries of the upper and lower surfaces.

Then, at the central portion of the disc-shaped core material 9, the sealing material 10,
A plurality of small through holes 12, 12 are formed in a portion located inside 10 so that all the lubricating oil flowing inside the water oil hole 5 having the seal ring 11 attached thereto is in the small through holes 12, 12. I am going to pass through.

The inner diameter d of each small through hole 12, 12 is sufficiently smaller than the inner diameter D of the lubricating oil passage 14 formed in the cylinder head 13 (d <D).
And, a plurality individual flow passage area of (n pieces) of Shotsu holes 12, 12 a ^{(= π · d 2/4} ), the area of the lubricating oil passage ^{14 (= π · D 2/} 4)
While sufficiently smaller than the sum of the passage area of all Shotsu holes 12,12 (= n · π · d 2/4) , the area of the lubricating oil passage 14 (= π · D ^2/4) to be more than equal.

Since the cylinder head gasket 8 of the present invention is configured as described above, the lubricating oil fed into the lubricating oil flow passage 14 provided inside the cylinder head 13 has a disc-shaped metal plate member. It is fed into the lubricating oil flow path 14 only through a plurality of small through holes 12 provided in the core material 9.

As described above, the flow passage area of each of the plurality of small through holes 12, 12 is sufficiently smaller than the area of the lubricating oil flow passage 14, so that the rubber pieces and the like sent from the oil pump mounting portion and the like are Even when reaching the upper end opening of the lubricating oil flow passage 16 on the cylinder block 15 side, this rubber piece or the like forms a plurality of small through holes 12, 12 at the central portion of the disk-shaped core material 9. It is collected in the part that did.

As a result, it is possible to reliably prevent a large rubber piece or the like from being fed into the lubricating oil passage 14 provided inside the cylinder head 13 so as to clog the lubricating oil passage 14.

Further, since the sum of the flow passage areas of all the small through holes 12, 12 is equal to or larger than the area of the lubricating oil flow passage 14 provided in the cylinder head 13, the resistance to the lubricating oil supply is not increased. The lubricating oil is smoothly supplied to the camshaft and the like provided inside the cylinder head 13 without increasing the addition of the oil pump.

Next, FIG. 3 shows a second embodiment of the present invention.

In the case of the present embodiment, in addition to the core material 9 that reinforces the ring-shaped sealing material 10, a metal mesh 17 which is a kind of plate-shaped member is supported inside the sealing material 10 to provide lubricating oil on the cylinder block 15 side. The lubricating oil flowing from the flow passage 16 to the lubricating oil flow passage 14 on the cylinder head 13 side is made to flow while passing through the mesh of the wire net 17. In this case, each mesh serves as a small through hole.

As a result, even if the rubber piece or the like sent from the oil pump mounting portion reaches the upper end opening of the lubricating oil flow path 16 on the cylinder block FIG. To be collected.

Next, FIG. 4 shows a third embodiment of the present invention.

In the case of the present embodiment, the wire net 17 provided inside the sealing material 10
The core material 9 in FIG. 3 is omitted by providing a function as a core material for reinforcing the sealing material 10.

Other configurations and operations are similar to those of the above-described first and second embodiments.

Next, FIG. 5 shows a fourth embodiment of the present invention.

In the case of this embodiment, a plate-shaped portion 18 integral with the seal material 10 is provided inside the ring-shaped seal material 10 which is reinforced by the ring-shaped core material 9, and the plate-shaped portion 18 has a plurality of small parts. The through holes 12, 12 are formed so that the lubricating oil flowing from the lubricating oil flow passage 16 on the cylinder block 15 side to the lubricating oil flow passage 14 on the cylinder head 13 side passes through the plurality of small through holes 12, 12. I try to make it flow. Since a large pressure difference does not occur between both surfaces of the rubber plate-shaped portion 18, there is no risk of damage to the plate-shaped portion 18.

Other configurations and operations are similar to those of the first to third embodiments described above.

Further, FIG. 6 shows a fifth embodiment of the present invention.

In the case of this embodiment, the wire mesh 17 supported inside the sealing material 10 is used.
The center portion of the is curved convexly toward the downstream side (toward the cylinder head 13 side).

As a result, in the case of the present embodiment, the rubber pieces or the like captured by the wire netting 17 are prevented from gathering in the central portion of the wire netting 17, and the rubber piece or the like prevents the wide area of the wire netting from being blocked.

Other configurations and operations are similar to those of the first to fourth embodiments described above. The structure in which the central portion is convexly curved toward the downstream side as described above can be applied not only to the seal ring 11 made of the wire net 17 but also to other seal rings 11.

(Effect of the Invention) Since the cylinder head gasket of the present invention is constructed and operates as described above, the lubrication oil flow path provided inside the cylinder head can be provided with this lubrication oil without increasing resistance to the lubrication oil supply. It is possible to reliably prevent a large rubber piece from being fed so that the oil flow path is clogged, and to improve engine reliability and durability.

[Brief description of drawings]

1 and 2 show a first embodiment of the present invention. FIG. 1 is a perspective view showing a seal ring to be incorporated in a cylinder head gasket, and FIG. 2 is a part of the cylinder head gasket. Cross-sectional view of the part incorporating the ring,
FIG. 3 shows the second embodiment of the present invention, FIG. 4 shows the third embodiment, FIG. 5 shows the fourth embodiment, and FIG. 6 shows the fifth embodiment.
FIG. 7 is a cross-sectional view of the respective seal rings, FIG. 7 is a plan view showing an example of the cylinder head gasket which is the subject of the present invention, and FIG. 8 is a conventional cylinder head gasket.
It is a figure corresponded in the AA cross section of FIG. 1: Metal core material, 2: Layer, 3: Gasket sheet, 4: Bore hole,
5: Water / oil hole, 6: Small hole, 7: Grommet, 8: Cylinder head gasket, 9: Core material, 10: Seal material, 11: Seal ring, 1
2: Small through hole, 13: Cylinder head, 14: Lubricating oil passage, 15: Cylinder block, 16: Lubricating oil passage, 17: Wire mesh, 18: Plate-shaped part.

Claims (1)

[Scope of utility model registration request] 1. A sheet-like gasket sheet is provided with a bore hole conforming to the opening shape of the cylinder top, a water oil hole for passing cooling water or lubricating oil, and a small hole for inserting a bolt. A cylinder head gasket which is provided with a seal ring made of a metal core material and a seal material held by the core material fitted inside at least a part of the water oil holes. A cylinder head gasket, characterized in that a plate-shaped member having a plurality of small through holes is provided inside a sealing material constituting the seal ring.