JPH02286859A - Cylinder head gasket - Google Patents

Abstract

PURPOSE:To reduce the man-hours, suppress the manufacturing costs, and pre vent output of unacceptable products by furnishing detents consisting of No.1, No.2 flap in places at the perimeter of a base board to constitute a seal ring, and by pinching the inner edges of a through hole with the detents. CONSTITUTION:Detents 15 consisting of No.1, No.2 flap 16, 17 each forms a couple are furnished in places at the perimeter of a base board 7 made of metal which constitutes a seal ring 6. This seal ring 6 is fixed fast to the inner side of a through hole 4 by pinching its inner edges with the No.1 flap 16 and No.2 flap 17 constituting each detent 15. Thus, man-hours are reduced, the manufacturing costs suppressed, and output of unacceptable products prevented.

Description

Detailed Description of the Invention (Field of Industrial Application) The cylinder head gasket according to the present invention is a cylinder head gasket that is sandwiched between the upper surface of the cylinder block of an engine and the lower surface of the cylinder head in order to maintain airtightness and liquid tightness between the upper surface and the lower surface of the cylinder head. used as

(Prior Art) A cylinder head gasket is sandwiched between the lower surface of the cylinder head and the upper surface of the cylinder block of an internal combustion engine to prevent high-pressure combustion gas generated within the cylinder from leaking to the outside.
Alternatively, leakage of cooling water or lubricating oil flowing between the cylinder block and cylinder head is prevented.

FIG. 4 shows an example of a cylinder head gasket used in such a case. This cylinder head gasket 1 includes a circular bore hole 2.2 that matches the opening shape of the top of the cylinder, a small circular hole 3.3 through which a bolt for fixing the cylinder head to the cylinder block is inserted, and cooling water and lubricating oil. Through hole 4.4 (shape is not necessarily circular)
is drilled. Reference numeral 5 denotes a grommet made of a thin metal plate attached to the inner peripheral edge of each bore hole 2.2.

By the way, in the cylinder head gasket 1 formed in this way, in order to effectively prevent the cooling water and lubricating oil flowing inside the through holes 4.4 from leaking to the outside, each through hole 4.
．． It is common practice to attach a part called a seal ring to the inside of 4.

The seal ring mounted inside each through hole 4.4 is constructed as shown in FIGS. 5 and 6, for example. 5th ~
The seal ring 6 shown in Fig. 6 is made to be installed inside a circularly formed through hole 4, and has an outer peripheral shape that matches the inner peripheral shape of the through hole 4 to which it is to be installed. As shown in FIG. 6, silicone rubber, fluorine rubber, NBR, tolyl butadiene rubber) are applied to both the upper and lower surfaces of the circular metal substrate 7.
A sealing material 8 such as the following is baked on. The sealing material 8 is the seventh
As shown in the figure, it is baked onto the substrate 7 so as to cover the outer periphery of the substrate 7, or as shown in FIGS. In some cases.

In all of the seal rings 6 shown in FIGS. 6 and 7, when the seal ring 6 is installed inside the through hole 4, the seal ring 6 is fitted inside the through hole 4, and the outer peripheral edge of the seal ring 6 is The outer periphery of the substrate 7 (in the case of FIG. 6) or the outer periphery of the sealing material 8 (in the case of FIG. 7) and the inner periphery of the through hole 4 are bonded using room temperature vulcanizable silicone or the like. Glue with adhesive.

Further, in the structure shown in FIGS. 8 and 9, a part of the sealing material 8 that is baked onto the substrate 7 so as to cover the inner peripheral edge of the substrate 7 is extended to the outside of the substrate 7. A connecting portion 9 is provided, and a short cylindrical fitting piece 1 made of a sealing material is attached to the tip of the connecting portion 9.
0 is formed.

On the other hand, the inner circumferential edge of the through hole 4 into which the substrate 7 of the seal ring 6 is to be fitted has a communicating portion 11a into which the connecting portion 9 can be freely inserted;
A cutout 11 is formed in the fitting piece 10 and a fitting portion 11b having an inner diameter d (D) into which the fitting piece 10 can be fitted in a state in which the outer diameter thereof is elastically compressed.

When the seal ring 6 is installed inside the through hole 4 with the structure described above, the substrate 7 is placed inside the through hole 4, and the connecting portion 9 is attached to the inside of the through hole 4.
are respectively inserted into the communicating portions 11a of the notches 11, and the fitting pieces 10 are pushed into the fitting portions 11b at the tips of the notches 11. The fitting pieces 10 pushed into the fitting portions jib
The outer circumferential surface of is elastically pressed against the inner circumferential surface of the fitting part flb and held within the fitting part 11b, so that the board 7 connected to the fitting piece 10 via the connecting part 9, It is held within the through hole 4.

(Problem to be Solved by the Invention) However, the conventional cylinder head gasket 1 in which the seal ring 6 is mounted inside each through hole 4.4 as described above
However, the following inconveniences occurred.

That is, the thickness of the metal substrate 7 constituting the seal ring 6 is as thin as about 0.5 mm. Therefore, when the seal ring 6 is fixed inside the through hole 4 by adhesive, the adhesive area is small and the adhesive It is inevitable that the strength will weaken. This thing is
Even if the substrate 7 is exposed at the outer periphery of the seal ring 6 as shown in FIG. 6, the outer periphery of the seal ring 6 may be covered with the sealant 8 as shown in FIG. Even though
It's the same.

If the adhesive strength when attaching the seal ring 6 to the inside of each through hole 4.4 becomes weak, the seal ring 6 will easily fall off from the inside of the through hole 4.

When the cylinder head gasket 1 is in use, the seal ring 6 is also held between the upper surface of the cylinder block and the lower surface of the cylinder head, so it will not fall off. The seal ring 6 tends to fall off from inside the through hole 4 during transportation.

The seal ring 6 that has fallen off is easy to lose, and the seal ring 6
If the cylinder head gasket 1 is missing, the sealing performance around the through hole 4 will deteriorate, and if used as is, it will cause engine failure.

Furthermore, in the case of the structure shown in FIGS. 6 and 7, the seal ring 6
Since a process of applying an adhesive between the hole 4 and the through hole 4 is required, the number of manufacturing steps is large and the product cost increases.

Further, as shown in FIGS. 8 and 9, in a structure in which a part of the sealing material 8 extending to the outside of the sealing ring 6 is fitted into a notch 11 formed at the peripheral edge of the through hole 4. Also, the seal ring 6 is likely to be incompletely held inside the through hole 4, and the seal ring 6 is likely to fall off or be lost.

In order to eliminate such inconvenience, the applicant first proposed the 10th
We have invented a cylinder head gasket 1 that can securely hold a seal ring 6 inside a through hole 4 without using an adhesive, with a structure as shown in Figures 13 to 13.

In the cylinder head gasket 1 according to the present invention, T-shaped extending portions are formed outwardly at a plurality of locations on the outer peripheral edge of the base plate 7 constituting the seal ring 6. On the other hand, by twisting at an angle slightly smaller than 90 degrees, the locking portion 13.13 is formed.

Each of the locking portions 13.13 is inserted into a notch 12.12 formed at a position aligned with each locking portion 13.13 at the peripheral edge of the through hole 4 where the seal ring 6 is to be attached. At both ends of the locking portion 13.13, as shown in FIG. 12, the portions protruding from both the upper and lower surfaces of the sheet 14 constituting the cylinder head gasket 1 are connected to the sheet 14 as shown in FIG.
The substrate 7 constituting the seal ring 6 is supported inside the through hole 4 by bending it toward both the upper and lower sides.

However, in the case of the cylinder head gasket 1 according to the prior invention configured as described above, the locking portion formed on the outer periphery of the substrate 7 is located in the notch 12.12 formed on the periphery of the through hole 4. 13.13 and making both ends of each locking part 13.13 protrude from the notch part 12.12 is troublesome, and the production efficiency of the cylinder head gasket is not necessarily good.

An object of the present invention is to provide a cylinder head gasket that eliminates all of the above-mentioned disadvantages.

(Means for Solving the Problems) The cylinder head gasket of the present invention, like the conventional cylinder head gasket described above, has a circular bore hole that matches the opening shape of the top of the cylinder, and a through hole for passing fluid. is installed. A grommet made of a thin metal plate is attached to the inner circumferential edge of the bore hole, and a seal ring made of metal and having a sealing material provided on both sides of an annular substrate is attached to the inside of the through hole.

Furthermore, in the cylinder head gasket of the present invention,
At a plurality of locations on the outer peripheral edge of the metal base plate constituting the seal ring, locking portions are provided, each consisting of a pair of first and second tongue pieces.

The seal ring is supported and fixed inside the through hole by sandwiching the peripheral edge of the through hole between the first tongue piece and the second tongue piece that constitute each locking part.

(Function) When the cylinder head gasket of the present invention configured as described above is used by being sandwiched between the upper surface of the cylinder block and the lower surface of the cylinder head, the sealing action of the cylinder head gasket itself is as described above. This is exactly the same as the conventional cylinder head gasket.

However, in the cylinder head gasket of the present invention,
A substrate constituting a seal ring mounted inside the through hole is firmly supported inside the through hole by locking portions consisting of first and second tongue pieces provided at multiple locations on the outer periphery of the substrate. Therefore, even before the cylinder head gasket is sandwiched between the upper surface of the cylinder block and the lower surface of the cylinder head, the seal ring does not fall out from inside the through hole.

Furthermore, before bending any of the tongues toward the periphery of the through-hole, it is relatively easy to align the substrate forming the seal ring with the through-hole formed in the sheet of the cylinder head gasket. Since it can be done easily, the seal ring installation work does not become troublesome.

(Example) Next, the present invention will be explained in more detail by explaining the illustrated embodiment.

1 to 3 show embodiments of the present invention. FIG. 1 is a plan view showing the main parts of the cylinder head gasket, FIG. 2 is an enlarged view of section A in FIG. 1, and FIG. It is an enlarged BB sectional view of the figure.

A through hole 4 for circulating cooling water, lubricating oil, etc. between the cylinder block and the cylinder head is formed in a part of the sheet 14 constituting the cylinder head gasket 1. A seal ring 6 is attached to the inside of the ring.

The seal ring 6 is made by attaching a sealing material 8.8 to both sides of a metal substrate 7, which is formed entirely into a frame shape. The seal ring 6 has a shape that almost matches the inner peripheral shape, so that it can be freely inserted into the through hole 4 without leaving a large gap.

At three positions on the outer peripheral edge of the substrate 7, there are locking portions 15.1.
5 is set. Each locking portion 15.15 is bifurcated by arranging first and second tongues 16.17 parallel to each other with a slight distance between them.

As shown in FIGS. 2 and 3, the first tongue piece 16 and the second tongue piece 17 that constitute each locking part 15.15 are
is brought into contact with the upper surface of the peripheral edge of the through hole 4, and the second tongue piece 17 is brought into contact with the lower surface of the peripheral edge. That is, the peripheral edge of the through hole 4 is held between the first and second tongue pieces 16 and 17.

As a result, the seal ring 6 having the substrate 7 is supported and fixed inside the through hole 4. In the illustrated embodiment, a notch 18.18 is formed in the inner peripheral edge of the through hole 4 at a portion where each locking portion 15.15 faces each other, and the first and second portions forming each locking portion 15.15 are The proximal side edges of the tongues 16,17 are engaged with the edges of each notch 18,18. Therefore, in the case of this embodiment, even if the force that holds the peripheral edge of the through hole 4 between the first and second tongue pieces 16 and 17 is not so strong, the substrate 7 will not shift inside the through hole 4. There is no.

The cylinder head gasket 1 of the present invention is constructed by assembling each part having the above-described configuration, but when this cylinder head gasket 1 is used by being sandwiched between the upper surface of the cylinder block and the lower surface of the cylinder head, take off,
The sealing action of the cylinder head gasket 1 itself is exactly the same as that of the conventional cylinder head gasket described above.

However, in the case of the cylinder head gasket 1 of the present invention, as described above, the substrate 7 forming the seal ring 6 mounted inside the through hole 4 has locking portions provided at three positions on the outer periphery of the substrate 7. 15.15, it is firmly supported inside the through hole 4.

First and second tongue pieces 16 configuring each locking portion 15.15.
17, when the peripheral edge of the through hole 4 is to be clamped, the seal ring 6 is inserted into the inside of the through hole 4 while the first tongue piece 16 remains raised, as shown by the chain line in FIG. . This insertion work can be easily and reliably performed using positioning pins provided on the press mold.

Once the seal ring 6 is inserted into the through hole 4 in this way, the grommet 5 is attached to the peripheral edge of the bore hole 2 using the press die, and at the same time the first tongue piece 16 is inserted into the through hole. 4, the first tongue piece 16 and the second tongue piece 17, which was originally in contact with the peripheral edge of the through hole 4, sandwich the peripheral edge of the through hole 4, Board 7
is supported and fixed inside the through hole 4.

As a result, the seal ring 6 is prevented from accidentally falling off from inside the through hole 4, and it is possible to prevent deterioration of sealing performance and product yield due to the seal ring 6 falling off or being lost.

(Effects of the Invention) Since the cylinder head gasket of the present invention is constructed and operates as described above, although it can be easily manufactured, it also reduces man-hours and manufacturing costs by omitting the adhesive application process. It is possible to reduce the cost and prevent the occurrence of defective cylinder head gaskets by preventing the seal ring from falling off, which maintains the sealing performance around the through hole, and improves product yield. It also eliminates the risk of engine failure due to leakage of cooling water or lubricating oil.

[Brief explanation of the drawing]

1 to 3 show embodiments of the present invention. FIG. 1 is a plan view showing the main parts of the cylinder head gasket, FIG. 2 is an enlarged view of section A in FIG. 1, and FIG. FIG. 4 is a plan view showing an example of a cylinder head gasket, FIG. 5 is a perspective view showing an example of a seal ring attached to a conventional cylinder head gasket, and FIG. A cross-sectional view showing the seal ring installed inside the through hole,
Fig. 7 is a sectional view showing a state in which seal rings of different shapes are installed inside the through hole, Figs. 8 and 9 show separate seal ring mounting parts, Fig. 8 is an exploded perspective view, and Fig. The figure is a cross-sectional view taken along the line C-C in Fig. 8 showing the assembled state, and Fig. 10-
Fig. 13 shows the cylinder head gasket for the starter, Fig. 10 is an exploded perspective view showing the main parts of the cylinder head gasket, Fig. 11 is a view from arrow D in Fig. 10, and Fig. 1
Figure 2 is a sectional view taken along line E-E in Figure 10 after the locking part is inserted into the notch and before the locking part is bent;
FIG. 13 is a view similar to FIG. 12, showing a state after the locking portion is bent. 1 Niji cylinder head gasket, 2: Bore hole, 3: Small circular hole, 4: Through hole, 5: Grommet, 6: Seal ring, 7
: Substrate, 8: Sealing material, 9: Connecting part, 10: Fitting piece, 1
1: Notch, 11a; Communication portion, 11b; Fitting portion, 12
; Notch portion, 13: Locking portion, 14: Sheet, 15: Locking portion, 16: First tongue piece, 17: Second tongue piece, 18: Notch. Patent Applicant Nippon Reinz Co., Ltd. Agent Kinzo Koyama (and 1 other person) 4vA 5th Cause Figure 10

Claims (1)

[Claims] (1) A circular bore hole that matches the opening shape of the top of the cylinder, a through hole for passing fluid, a grommet made of a thin metal plate attached to the inner peripheral edge of the bore hole, and a metal annular substrate. In a cylinder head gasket consisting of a sealing material provided on both sides of the gasket and a sealing ring attached to the inside of the through hole, each of the cylinder head gaskets is provided with sealing material at multiple locations on the outer periphery of the metal substrate that constitutes the sealing ring. A locking portion constituted by a first tongue piece and a second tongue piece is provided, and the inner peripheral edge of the through hole is held between the first tongue piece and the second tongue piece forming each locking portion. A cylinder head gasket characterized by a seal ring supported and fixed inside a through hole.