JP2000227161A - Cylinder head gasket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely attach a sealing member to a gasket substrate without using any adhesive by holding a part around the main body part of the sealing member between two outer gasket substrates. SOLUTION: A cylinder head gasket is provided with two outer gasket substrates 5 and 6, and at least one inner gasket substrate 7 disposed between the two outer gasket substrates. A through-hole 7a is formed in the inner gasket substrate, and a through-hole 6a larger in diameter than the through-hole 7a is formed in the outer gasket substrate 6. The main body part 20a of a sealing member 20 is arranged in the through-hole 7a, the lip parts (sealing parts) 20c to 20e of the sealing member are put through the through-hole 6a to be protruded to the outside, and a part around the main body part is held between the two outer gasket substrates.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder head gasket used for an engine.

[0002]

2. Description of the Related Art Conventionally, a cylinder head gasket is generally sandwiched between a cylinder head and a cylinder block to seal between them. Conventionally,
In some cases, a case for accommodating a camshaft drive chain or the like is connected to the cylinder block, in which case, the cylinder head gasket is sandwiched between the cylinder head and the cylinder block and the case connected thereto. I have. In such a configuration, a slight step easily occurs between the upper surface of the cylinder block and the upper surface of the case connected thereto, and there is a risk that the lubricating oil in the case leaks outside through a gap due to the step. By providing a seal member on the cylinder head gasket in a portion adjacent to the cylinder block and the case over the cylinder block and the case, the leakage is prevented.
50691, Japanese Utility Model Laid-Open No. 4-82345).

[0003]

The above-mentioned sealing member is fitted and fixed in a hole formed in the cylinder head gasket, or attached by bonding with an adhesive, but is fitted in the hole. There is a danger that it will fall off if it is used alone, and on the other hand, it will take time and effort to adhere. The present invention has been made in view of such circumstances, and provides a cylinder head gasket to which a seal member can be securely attached without using an adhesive.

[0004]

That is, the present invention relates to a cylinder head gasket sandwiched between a cylinder head and a cylinder block and a case having an opening connected thereto, the cylinder head gasket comprising: In a cylinder head gasket provided with a sealing member arranged over both sides of the cylinder block and the case adjacent to the cylinder block, the cylinder head gasket is disposed between two outer gasket substrates and at least two outer gasket substrates. A single inner gasket substrate, a through hole is formed in the inner gasket substrate, and a through hole having a diameter smaller than the through hole is formed in the cylinder block and the outer gasket substrate on the case side. The body of the sealing member is placed in the through hole of the inner gasket substrate Rutotomoni, the seal portion of the seal member by penetrating the through hole of the outer gasket substrate protrudes to the cylinder block and the case side, and the periphery of the main body is obtained by sandwiching the above two outer gasket substrate.

[0005]

According to the above construction, since the periphery of the main body of the seal member is sandwiched between the outer gasket substrates, the seal member can be securely attached to the gasket substrate without requiring an adhesive.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiment. Referring to FIG. 1, a cylinder head gasket 1 includes a cylinder head 2, a cylinder block 3, and a case 4 for accommodating a camshaft driving chain and the like connected thereto. The cylinder head gasket 1 comprises two outer gasket substrates 5 and 6 and one inner gasket substrate 7 disposed between the outer gasket substrates 5 and 6. Are laminated. As shown in FIG. 2, the gasket substrates 5 to 7 are provided with a combustion chamber hole 8, an oil water hole 10 through which lubricating oil or cooling water flows, and a bolt hole 9 for inserting a fastening bolt (not shown). Further, an opening 11 through which a chain (not shown) housed in the case is inserted is formed.

Each of the outer gasket substrates 5 and 6 has a full bead portion 15 surrounding the combustion chamber hole 8, and the full bead portion 15 and the oil / water hole 1 outside the full bead portion 15.
A half bead portion 16 surrounding the opening 11 is formed. The half bead 17 surrounds the opening 11 from the upper surface of the cylinder block 3 to the upper surface of the case 4 endlessly.
Is a part 1 adjacent to the cylinder block 3 and the case 4.
8 will be straddled in two places. Outside the half bead portion 17, two half bead portions 19 (1 in FIG. 2).
Book only), and each half bead portion 19
The half bead portion 17 is formed in parallel with the half bead portion 17 at a portion exceeding the adjacent portion 18 so as to exceed the adjacent portion 18, and both ends of the half bead portion 17 are formed on the outer gasket substrates 5 and 6, respectively. It curves towards the outer contour and extends there.

Further, seal members 20 are provided at two positions where the half bead portions 17 and 19 exceed the adjacent portion 18. As shown in FIG. 3, the seal member 20 includes a flat main body 20a.
The main body 20a is provided with two outer gasket substrates 5, 6
Is pinched by That is, a through hole 7 a is formed in the inner gasket substrate 7, and a through hole 6 a having a smaller diameter than the through hole 7 a is formed in the outer gasket substrate 6 on the cylinder block 3 and case 4 side.
The main body 20a of the seal member 20 is disposed in the through hole 7a of the inner gasket substrate 7, and
The periphery of “a” is sandwiched between two outer gasket substrates 5 and 6. At this time, an endless rib 20b is formed around the main body portion 20a to increase the thickness, and the rib 20b is sandwiched between the outer gasket substrates 5 and 6.

The seal member 20 has three lip portions 20c, 20d, and 20e as seal portions. These lip portions pass through the through holes 6a of the outer gasket substrate 6 and the cylinder block 3 and the case. It protrudes to the 4 side. The three lip portions 20c, 20d, 20
e is formed in parallel with the half bead portions 17 and 19 over the upper surface of the cylinder block 3 and the upper surface of the case 4, and free of the two lip portions 20c and 20d on the opening 11 side. The end extends obliquely toward the opening 11, and the free end of another lip 20e formed outside extends obliquely outward.

According to the above configuration, the sealing member 20
Around the body 20a of the outer gasket substrate 5,
6, no adhesive is required to attach the seal member 20 to the cylinder head gasket 1. At this time, a half bead portion 19 is formed outside the half bead portion 17 so that both half bead portions 1 are formed.
Since both sides of the main body 20a are sandwiched between 7, 19, the main body 20a can be stably clamped and fixed.

The cylinder head gasket 1
Is interposed between the cylinder head 2 and the cylinder block 3 and the case 4 connected thereto, and is clamped between them by tightening the fastening bolts in this state. At this time, for example, as shown in FIG. 1, when the upper surface of the case 4 is lower than the upper surface of the cylinder block 3 and there is a step between them, as shown in FIG. The lip portions 20c, 20d, and 20e of the seal member 20 sandwiched between the cylinder block 3 and the lip portion of the seal member 20 sandwiched between the cylinder head 2 and the case 4, as shown in FIG. 20c, 20d and 20e are laid down small. As described above, the sealing member 20 is provided with the lip portion 2 as a sealing portion.
0c, 20d, and 20e, and the gap between the steps can be sealed by the elastic deformation caused by the undulation of the lip portion, so that a large step is formed between the upper surface of the cylinder block 3 and the upper surface of the case 4. Even so, the gap can be effectively sealed.

Further, as described above, when the upper surface of the case 4 is lower than the upper surface of the cylinder block 3 and there is a step between the two, the portion sandwiched between the cylinder head 2 and the case 4 There is a risk that the clamping force against the cylinder head gasket 1 may be insufficient, but even in this case, the ribs 20b are formed around the main body 20a of the seal member 20 to increase the wall thickness. The surface pressure in the portion can be increased, and the lubricating oil can be prevented from leaking to the outside from between the gasket substrates 5, 6, 7.

In the above embodiment, the seal member 20 has the lip portions 20c, 20d, and 20e as seal portions, but the seal portion is not limited to the lip shape. In the above embodiment, the through hole 6a is formed in the cylinder block 3 and the outer gasket substrate 6 on the case 4 side. However, a similar through hole is also formed in the other outer gasket substrate 5, and the sealing member 20 is formed. May be made to protrude toward the cylinder head 2 through the through hole.

[0014]

As described above, according to the present invention, since the periphery of the main body of the seal member is sandwiched between the outer gasket substrates, the seal member is securely attached to the gasket substrate without requiring an adhesive. The effect that it can be obtained is obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a plan view of a main part of the cylinder head gasket 1 shown in FIG.

FIG. 3 is a perspective view showing a cross section taken along line III-III of FIG. 2;

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 1;

FIG. 5 is a sectional view taken along the line VV in FIG. 1;

[Description of Signs] 1 ... Cylinder head gasket 2 ... Cylinder head 3 ... Cylinder block 4 ... Case 5, 6 ... Outer gasket board 7 ... Inner gasket board 6a, 7a ... Through hole 11 ... Opening 17, 19 ... Half bead 20 ... Seal member 20a ... Main body part 20b ... Rib 20c, 20d, 20e ... Rip part

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Eisaburo Goto 3-65 Midorigaoka, Toyota-shi, Aichi Prefecture F-term within Taiho Kogyo Co., Ltd. 3J040 AA02 AA11 BA04 CA01 EA07 EA08 EA09 EA15 EA17 EA22 EA27 EA28 EA38 HA02 HA05 HA17

Claims (3)

[Claims] 1. A cylinder head gasket sandwiched between a cylinder head and a cylinder block and a case having an opening connected to the cylinder head, the cylinder head gasket being located adjacent to the cylinder block and the case. Wherein the cylinder head gasket comprises: two outer gasket substrates; and at least one inner gasket substrate disposed between the outer gasket substrates. A through hole is formed in the inner gasket substrate, and a through hole having a smaller diameter than the through hole is formed in the outer gasket substrate on the cylinder block and the case side. Of the seal member and Parts by penetrating the through hole of the outer gasket substrate protrudes to the cylinder block and the case side, and a cylinder head gasket, characterized in that the periphery of the body portion was sandwiched between the both outer gasket substrate. 2. The cylinder head gasket according to claim 1, wherein an endless rib is formed around the main body, and the rib is sandwiched between the outer gasket substrates. 3. The cylinder head gasket includes a bead portion surrounding an opening from an upper surface of the cylinder block to an upper surface of the case, and the seal member is provided on the bead portion. Claim 1.
Or the cylinder head gasket according to claim 2.