JPH0536134Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a cylinder head gasket for an internal combustion engine.

[Prior Art] A cylinder head gasket, which is installed between the cylinder block and cylinder head of an internal combustion engine to prevent combustion gas, cooling water, oil, etc. from leaking, is usually made of multiple metal plates. It is assembled by laminating and covering the middle plate with the upper and lower outer plates, and hole seals are provided around the combustion chamber holes and various fluid holes.
Among these, in the combustion chamber hole seal part,
One of the outer panels is folded over the other, or the laminated metal plates are sandwiched between grommets, but in order to improve the sealing effect of the combustion chamber hole seal, it is necessary to It is necessary to keep the pressure higher than other parts. In particular, the area between two combustion chamber holes that are close to each other is exposed to extremely high temperatures, so the metal plate is prone to thermal fatigue, which can cause gas leaks, so make sure to protect it from sufficient surface pressure. It is necessary to prevent the sealing performance from deteriorating by increasing the sealing performance.

As a method of increasing the surface pressure of the hole seal part, there is a method of increasing the laminated thickness of metal plates by superimposing a surface pressure adjusting plate of a desired thickness inside the hole seal part. If a surface pressure adjusting plate is installed to increase the surface pressure of the entire hole seal portion, a large tightening force will be required when tightening the gasket. Therefore, it is desirable to locally increase the surface pressure of the hole seal portion.

[Problem to be solved by the invention] The technical problem of the invention is to locally increase the surface pressure of the combustion chamber hole sealing part in a cylinder head gasket with a simple structure and improve the sealing effect. .

[Means for Solving the Problems] In order to solve the above problems, the present invention is constructed by laminating an outer plate and a middle plate made of metal plates, and has a plurality of combustion chamber holes corresponding to the combustion chambers of the cylinder block. and around each combustion chamber hole,
In a cylinder head gasket for an internal combustion engine, the cylinder head gasket for an internal combustion engine has a hole seal portion formed by folding one outer plate toward the other outer plate along the hole edge of the combustion chamber hole or by sandwiching a grommet to the hole edge, In order to locally increase the surface pressure of the hole sealing portion around the combustion chamber holes, an auxiliary plate thinner than the laminated metal plate is arranged around each combustion chamber hole so as to surround the combustion chamber hole,
At the side end of the auxiliary plate along the combustion chamber hole, a bent part with a flat double structure is formed by folding the end part back with a width narrower than the width of the hole sealing part, and the bent part is used as a hole sealing part. It is characterized by being sandwiched between laminated metal plates within the section.

In addition, the present invention is constructed by laminating an outer plate and a middle plate made of metal plates, and is provided with a plurality of combustion chamber holes corresponding to the combustion chambers of the cylinder block, and one of the combustion chamber holes is provided around each combustion chamber hole. In the cylinder head gasket for an internal combustion engine, the cylinder head gasket for an internal combustion engine has a hole seal portion formed by folding the outer plate along the edge of the combustion chamber hole to the other outer plate side or by sandwiching a grommet to the edge of the hole. In order to locally increase the surface pressure of the hole seal around the chamber hole, the adjacent two
An auxiliary plate thinner than the laminated metal plate is partially disposed at the boundary between the two combustion chamber holes, and the end of the auxiliary plate has a width narrower than the width of the hole seal portion at the side end along the combustion chamber hole. This is characterized in that a folded portion having a flat double structure is formed by folding it back, and that the bent portion is sandwiched between laminated metal plates within the hole seal portion.

Furthermore, the present invention is constructed by laminating an outer plate and a middle plate made of metal plates, and is provided with a plurality of combustion chamber holes corresponding to the combustion chambers of the cylinder block, and one outer plate is provided around each combustion chamber hole. A hole seal portion is formed by folding the plate along the edge of the combustion chamber hole to the other outer plate side or sandwiching a grommet to the hole edge, and a wiring is disposed within the hole seal portion. In a cylinder head gasket for an internal combustion engine, in order to locally increase the surface pressure of the hole seal around the combustion chamber hole, an auxiliary plate thinner than the laminated metal plate is placed around each combustion chamber hole to surround the combustion chamber hole. By folding the end portion of the auxiliary plate along the combustion chamber hole with a width narrower than the width of the hole sealing portion, a bent portion of a flat double structure is formed. It is characterized in that the bent portion is sandwiched between the metal plate and the wiring within the hole seal portion.

[Function] The above gasket is installed between the cylinder block and the cylinder head, and is tightened with tightening bolts in a plurality of bolt holes surrounding the combustion chamber hole. By partially increasing the thickness of the hole seal around the hole, the surface pressure during tightening is locally increased, improving the sealing performance at the hole seal and preventing gas leakage due to thermal fatigue. will not occur.

[Examples] Examples of the present invention will be described in detail below with reference to the drawings.

1 and 2 show a metal laminated type cylinder head gasket.

This cylinder head gasket 1 is constructed by laminating several metal plates constituting upper and lower outer plates 2, 3 and middle plates 4, 5, and covering the middle plates 4, 5 with the outer plates 2, 3. It is used by being installed between an engine member, that is, a cylinder block provided with a combustion chamber and a cylinder head.

The gasket 1 consisting of the outer plates 2, 3 and the middle plates 4, 5 has a hole seal portion 7 around a plurality of combustion chamber holes 6 corresponding to the combustion chambers of the cylinder block. The middle plates 4 and 5 are covered by folding back toward the upper outer plate 2 side along the hole edge of the gasket 6, and within this folded part 3a, the surface pressure of the hole sealing part 7 when tightening the gasket is localized. In order to increase the combustion efficiency, an auxiliary plate 8 having a thinner wall (0.02 to 0.15 mm) than the outer plates 2, 3 and the middle plates 4, 5 is arranged between the middle plates 4 and 5. Due to the bent portion 8a formed at the side end along the chamber hole 6,
The laminated thickness of the metal plates in the hole seal portion 7 is locally increased at the position of the bent portion 8a.

That is, as shown in FIGS. 3 and 4, the auxiliary plate 8 is provided with a plurality of holes 10 corresponding to each combustion chamber hole 6, and a hole sealing portion 7 is attached to the peripheral edge of each hole 10. The bent portion 8a of the flat double structure is formed by folding the metal plate with a width narrower than the width of the metal plate. The laminated thickness is locally increased at the position of the bent portion 8a, thereby increasing the surface pressure of the hole seal portion 7 locally. In this case, the auxiliary plate 8 may be configured to be independent for each combustion chamber hole 6.

In addition, without disposing the auxiliary plate around the entire circumference of the combustion chamber hole 6 as described above, the boundary portion 9 sandwiched between two adjacent combustion chamber holes 6, 6, which is particularly prone to thermal fatigue, is
The auxiliary plate 8 may be placed partially around the combustion chamber hole 6, or from above the auxiliary plate 8 placed around the entire circumference of the combustion chamber hole 6.
Another auxiliary plate 11 (see FIG. 5) may be superimposed on the boundary portion 9. As shown in FIGS. 5 and 6, this auxiliary plate 11 has bifurcated branch portions 12, 12 and 13 at both ends in the length direction, respectively.
13, and an arc-shaped curved edge 1 that fits the hole edges of the two combustion chamber holes 6, 6 on both sides in the width direction.
4, 14, and the ends of the curved edges 14, 14 are folded back inward to form bent portions 11a, 11a.

In addition, in the figure, 15 indicates a cooling water hole, and 16 indicates a bolt hole.

Further, in the illustrated embodiment, the lower outer panel 3 is folded back toward the upper outer panel 2 side, but by folding the upper outer panel 2 back toward the lower outer panel 3 side, the middle panels 4, 5
It can also be coated.

Cylinder head gasket 1 having the above configuration
is installed between the cylinder block and the cylinder head, and has a plurality of bolt holes 1 surrounding the combustion chamber hole 6.
6 is tightened with a tightening bolt, but the laminated thickness of the hole sealing portion 7 around the combustion chamber hole 6 is locally increased by the bent portions 8a, 11a formed on the auxiliary plates 8, 11. Since the surface pressure during tightening is locally increased in that portion, the sealing performance of the hole seal portion 7 is improved.

In addition, in the above embodiment, the auxiliary plate 8 is used as the middle plate 4, 5.
Although it is sandwiched between them, it goes without saying that it may also be placed between any of the middle plates 4, 5 and the corresponding outer plates 2, 3, or if a grommet is used, inside the grommet. It is.

In the second embodiment shown in FIG. 7, the upper outer plate 22 is folded back to the outside of the lower outer plate 23 to form a folded part 22a at the hole sealing part 27, and a bead 24a is formed on a part of the middle plate 24. A bent portion 28a at the end of an auxiliary plate 28 formed between the middle plate 24 and the upper outer plate 22 is sandwiched between the bead 24a and the outer plate 22.

In addition, in the third embodiment shown in FIG. 8, the folded portion 32a of the upper outer panel 32 is
A wire ring W made of a metal wire such as a mild steel wire or a stainless steel wire is provided inside the wire ring, and the bent portion 38a of the auxiliary plate 38 disposed between the upper outer plate 32 and the middle plate 35 at the upper end is connected to the wire ring. It is held between W and the outer plate 32.

[Effects of the invention] According to the invention described in detail above, an auxiliary plate is arranged in the hole sealing part around the combustion chamber hole, and the end portion of the auxiliary plate is attached to the side end along the combustion chamber hole. By folding back the hole seal part with a width narrower than the width, a flat double structure bent part is formed, and the bent part is sandwiched between the laminated metal plates or between the metal plate and the wiring within the hole seal part. Therefore, the interposition of the bent portion can locally increase the surface pressure of the hole seal portion, thereby further improving the sealing effect of the hole seal portion.

Furthermore, since the auxiliary plate is thinner than the laminated metal plate and its side ends are bent into a flat double structure, the auxiliary plate can be easily bent.

[Brief explanation of the drawing]

Fig. 1 is a front view of the cylinder head gasket according to the present invention, Fig. 2 is an enlarged sectional view taken along the line A-A, Fig. 3 is a front view showing an example of the auxiliary plate, and Fig. 4 is its B - An enlarged sectional view taken along line B, FIG. 5 is a front view showing another example of the auxiliary plate, FIG. 6 is an enlarged sectional view taken along line C-C, and FIGS. FIG. 3 is a sectional view showing another embodiment of the invention. 1... Cylinder head gasket, 2, 3...
Outer plate, 4, 5... Middle plate, 6... Combustion chamber hole, 7, 2
7, 37, ... Hole seal part, 8, 11, 28, 3
8,...Auxiliary plate, 8a, 11a, 28a, 38
a, ... Turning part, 9 ... Boundary part, W ... Wiring.

Claims (1)

[Claims for Utility Model Registration] 1. It is constructed by laminating an outer plate and an inner plate made of metal plates, and is equipped with a plurality of combustion chamber holes corresponding to the combustion chambers of the cylinder block, and has a plurality of combustion chamber holes around each combustion chamber hole. In a cylinder head gasket for an internal combustion engine, the cylinder head gasket has a hole seal portion formed by folding one outer plate back along the edge of the combustion chamber hole toward the other outer plate or by sandwiching a grommet to the edge of the hole. In order to locally increase the surface pressure of the hole seal around the combustion chamber holes, an auxiliary plate thinner than the laminated metal plate is arranged around each combustion chamber hole so as to surround the combustion chamber hole. At the side end of the auxiliary plate that runs along the combustion chamber hole, a bent part with a flat double structure is formed by folding back the end with a width narrower than the width of the hole sealing part, and the bent part is inserted into the hole sealing part. A cylinder head gasket, characterized in that it is sandwiched between laminated metal plates. 2. It is constructed by laminating an outer plate and a middle plate made of metal plates, and is provided with a plurality of combustion chamber holes corresponding to the combustion chambers of the cylinder block, and one outer plate is placed around each combustion chamber hole to accommodate the combustion chamber. In a cylinder head gasket for an internal combustion engine, which has a hole seal portion formed by folding it back to the other outer plate side along the hole edge of the chamber hole or by sandwiching a grommet to the hole edge, In order to locally increase the surface pressure of the hole seal part, an auxiliary plate thinner than the laminated metal plate is partially provided at the boundary between two adjacent combustion chamber holes, and the side of the auxiliary plate along the combustion chamber hole is A flat double structure bent part is formed by folding the end part back with a width narrower than the width of the hole sealing part, and the bent part is sandwiched between the laminated metal plates within the hole sealing part. A cylinder head gasket characterized by: 3 It is constructed by laminating an outer plate and a middle plate made of metal plates, and has a plurality of combustion chamber holes corresponding to the combustion chambers of the cylinder block, and one outer plate is placed around each combustion chamber hole to form a combustion chamber. A cylinder for an internal combustion engine, comprising a hole seal portion formed by folding the hole along the edge of the hole to the other outer plate side or sandwiching a grommet to the edge of the hole, and disposing a wiring inside the hole seal portion. In the head gasket, in order to locally increase the surface pressure of the hole seal around the combustion chamber holes, an auxiliary plate thinner than the laminated metal plate is placed around each combustion chamber hole so as to surround the combustion chamber hole. Then, at the side end of the auxiliary plate along the combustion chamber hole, a bent part of a flat double structure is formed by folding the end part back with a width narrower than the width of the hole seal part, and the bent part is A cylinder head gasket characterized by being sandwiched between a metal plate and a wiring in a hole sealing part.