JPH0729360U - Metal gasket for manifold - Google Patents

Abstract

(57) [Abstract] [Purpose] The structure is simple and the number of parts is small, the sealing property between the high temperature part of the exhaust gas and the low temperature part of the intake air is ensured, and the step difference caused by the temperature difference is absorbed by the simple structure, and the exhaust manifold part Another object of the present invention is to provide a metal gasket for a manifold, which can further improve the sealing property of the intake manifold portion. A gasket for an engine in which a contact surface of an intake manifold and a contact surface of an exhaust manifold are on the same plane, and the manifolds are close to each other
And an exhaust manifold portion 5 having an exhaust hole 4 are formed by a single intermediate plate 1. Above and below the intermediate plate 1, the intake manifold portion 3 has the intake holes 2
A rubber coated metal plate 10 having a bead formed around the intake opening 11 corresponding thereto is laminated, and the exhaust manifold portion 5 forms an exhaust opening 8 corresponding to the exhaust hole 4 and a bead around the exhaust opening 8. Elastic metal plate 7
Are laminated, and bolt holes 13 are formed in the exhaust manifold portion 5 and the boundary portion 6 between the exhaust manifold portion 5 and the intake manifold portion 3.
Is the configuration that was opened.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is applicable to an engine in which the contact surfaces of the intake manifold and the exhaust manifold, which contact the cylinder head, are on the same plane between the mounting surfaces of the pair of structures, and the manifolds are close to each other. It relates to the metal gasket for the manifold used.

[0002]

[Prior art]

 Conventionally, a gasket for a manifold, which is sandwiched between the cylinder head and the exhaust manifold and intake manifold, and is tightened with tightening bolts, etc., uses an original plate made by laminating an expanded graphite sheet on a thin metal plate. A stainless steel grommet is provided at the opening of the high temperature part on the exhaust side, and a gasket is used for the opening of the low temperature part on the intake side, which is left unpunched.

However, recently, in a high-performance engine for a motor vehicle aiming at weight reduction, downsizing of an engine, or high output and low fuel consumption, temperature changes due to adoption of a cylinder head made of an aluminum alloy for weight reduction. Due to the increase in thermal expansion or contraction, the increase in thermal deformation of the gasket mounting surface or mounting flange due to the thinning of the exhaust manifold, and the stress or heat load applied to the gasket due to the cooling / heating cycle conditions during engine use, Many problems such as gas leakage due to breakage and a sudden decrease in seal surface pressure may occur. Therefore, it is generally known that a metal gasket is used as an effective sealing means that can replace the conventional gasket such as asbestos, and various gaskets have been developed for the metal gasket.

For example, Japanese Utility Model Laid-Open No. 62-116149 discloses a metal laminated manifold gasket for an internal combustion engine. This has a structure in which the metal laminated plates are not fixed to each other by means such as folding back in the gas circulation holes, and a seal bead is provided around the gas circulation holes of two middle plates adjacent to each other in the metal laminated plates. The seal beads are provided so as to face each other in opposite or opposite directions, a stainless steel plate is placed on the surface of one outer plate that contacts the exhaust manifold, and the surface of the other outer plate that contacts the cylinder head is rustproofed. Then, the metal laminated plates are integrally formed by using a joining means such as spot welding.

Further, Japanese Utility Model Laid-Open No. 2-61169 discloses a metal laminated gasket for a manifold. This is sandwiched between the end face of the mounting flange of the exhaust manifold and the side face of the cylinder head that opens the exhaust outlet, and at least three or more metal thin plates are stacked in a non-bonded state without being fixed to each other. The thin metal plates on both sides are composed of thin plates with beads for sealing, and at least one surface of the middle plate of the thin metal plates is covered with a heat insulating material made of a mixture of smooth ceramics and metal. The beaded thin plates located on both sides have bead portions arranged opposite to each other, or the beaded thin plates located on both sides have bead portions arranged opposite to each other.

Further, Japanese Utility Model Laid-Open No. 2-61170 discloses a laminated gasket for manifold. This is sandwiched between the end face of the mounting flange of the exhaust manifold and the side face of the cylinder head where the exhaust discharge port is opened, and at least three or more metal thin plates are stacked in a non-bonded state without being fixed to each other. Of the metal thin plate with a bead for sealing, at least one of the middle plates of the metal thin plate is made of a heat insulating material such as a ceramic material, and the thin plate with beads located on both sides is a bead. The bead portions are arranged on opposite sides of each other, or the beaded thin plates located on both sides are the bead portions arranged on opposite sides.

[0007]

[Problems to be solved by the device]

 However, the metal laminated gasket, which has a structure in which several thin metal plates are stacked as described above, is highly flexible, has excellent heat resistance, and by incorporating a bead structure, it has an appropriate compressibility. It is known that it is economical because the sealing performance is not deteriorated, and it is known that it is economical between the mounting surfaces of a pair of structures, for example, the contact surface of the intake manifold where the cylinder head contacts and the exhaust manifold. In the present situation, there is no effective means for the metal gasket for a manifold used in a counterflow type engine in which the contact surface of the manifold is on the same plane and the manifolds are close to each other.

In particular, the strain generated in the high-temperature portion and the low-temperature portion in the same plane integrally is more than double that in the case where the strains are generated individually, and a step is generated on the intake surface and the exhaust surface. Since the gasket does not have the spring property to absorb the step, it is not easy to maintain the various properties of the gasket such as compression recovery, sealability, deformation resistance, sag resistance, and strength, and it is an effective seal. However, it is not possible to secure the required properties, and sealing with different materials complicates the structure and increases the number of parts, resulting in an increase in cost.

An object of the present invention is to solve the above-mentioned problems. The structure is simplified, the number of parts is small, the sealing property between the high temperature exhaust part and the low temperature intake part is ensured, and the step caused by the temperature difference is simple. (EN) Provided is a metal gasket for a manifold, which absorbs with such a structure and can further improve the sealing property between the exhaust manifold portion and the intake manifold portion.

[0010]

[Means for Solving the Problems]

 The present invention has been made to solve the above problems, and is a gasket for an engine in which the contact surface of the intake manifold and the contact surface of the exhaust manifold are on the same plane and the manifolds are in close proximity to each other. That is, the intake manifold part with the intake holes and the exhaust manifold part with the exhaust holes are formed by one intermediate plate, and the intake manifold part is above and below the intermediate plate, and the intake manifold part corresponds to the intake holes. And a beaded rubber coated metal material is laminated around it, and the exhaust manifold part is laminated with an elastic metal plate with beaded around the exhaust opening corresponding to the exhaust hole. Metallic gasket for manifold characterized by having a bolt hole at the exhaust manifold and at the boundary between the exhaust manifold and the intake manifold. It is.

[0010]

[Action]

 As described above, the intake manifold section and the exhaust manifold section are formed by one common intermediate plate, and the rubber manifold coated metal material is laminated on the upper and lower sides of the intermediate plate, and the exhaust manifold section is formed. Since elastic metal plates are laminated, the structure is simple and the number of parts is reduced, and in particular, the hot exhaust part and the cool intake part are sealed separately. Therefore, the sealing material and thickness can be set according to the high temperature and low temperature of each surface that is generated, and the sealing performance can be improved, and due to the temperature difference, it can occur in the exhaust high temperature part and the intake low temperature part. It acts to absorb the steps and further improve the sealing performance.

[0012]

【Example】

 An embodiment of the metal gasket for a manifold according to the present invention will be described below with reference to the drawings. 1 is a left side front view of a bilaterally symmetrical metal gasket for a manifold according to an embodiment, FIG. 2 is an exploded sectional view taken along the line AA of FIG. 1, and FIG. 3 is an enlarged sectional view taken along the line BB of FIG. 4 is an enlarged sectional view taken along the line CC of FIG.

In the figure, reference numeral 1 denotes an intermediate plate, which is made of a metal material having excellent heat resistance, for example, an aluminum-welded steel plate or a stainless steel material having a thickness of 0.5 mm, and an intake manifold portion 3 having an intake hole 2 and an intake manifold portion 3. The exhaust manifold portion 5 having the exhaust hole 4 is formed by one sheet, and the boundary portion 6 between the intake manifold portion 3 and the exhaust manifold portion 5 is continuous with a narrow width that allows the opening of the bolt hole 13.

Reference numeral 7 denotes a heat-resistant elastic metal plate made of SUS301 or SUS304 having a thickness of 0.25 to 0.3 mm, which is laminated above and below the intermediate plate 1 while avoiding the intake manifold portion 3, and corresponds to the exhaust hole 4. An exhaust opening hole 8 is formed, and a half bead 9 is formed around the hole 8.

Further, 10 is a rubber coated metal plate (a thin steel plate 0.25 mm + a NBR having a thickness of 0.2 mm on both sides) laminated above and below the intake manifold portion 3 of the intermediate plate 1, and the intake air corresponding to the intake hole 2 is provided. An opening hole 11 is formed, and a chevron bead 12 is formed around the hole.

Further, 13 is a bolt hole, and the boundary portion 6 between the intake manifold portion 3 and the exhaust manifold portion 5 is opened in a narrow width portion. In the bolt hole 13, a heat insulating material 14, for example, mica sheet, ceramic, With heat-resistant resin, etc. sandwiched between them, heat insulation effect on bolts, effect of stabilizing sealing performance by preventing reduction of tightening force, and deformation of seal surface due to temperature difference between intake manifold section 3 and exhaust manifold section 5 The effect is to stabilize the sealing performance.

Although a metal plate is used as the intermediate plate 1, a heat insulating ceramic may be used as the intermediate plate 1, and a mica sheet, an expanded graphite sheet or an aramid fiber sheet having a heat insulating effect may be used. The heat insulating material 14 is not necessary in these cases, but it is necessary to use eyelets or the like for the bolt tightening portion.

[0018]

[Effect of device]

 According to the metal gasket for a manifold according to the present invention described above, the intake manifold portion and the exhaust manifold portion are formed by one common intermediate plate, and the intake manifold portion is provided with a rubber coated metal above and below the intermediate plate. Since materials are laminated and an elastic metal plate is laminated on the exhaust manifold part, the structure is simple and the number of parts is small, especially because the exhaust high temperature part and the intake low temperature part are sealed separately. The sealing material and thickness can be set according to the high temperature and low temperature of each surface to improve the sealing performance, and the difference in temperature between the high temperature exhaust part and the low temperature intake part can be absorbed. It has the effect of further improving the sealing property.

[Brief description of drawings]

FIG. 1 is a front view showing a left half of a symmetrical metal gasket for a manifold according to the present invention.

FIG. 2 is an exploded cross-sectional view taken along the line AA of FIG.

FIG. 3 is an enlarged cross-sectional view taken along the line BB of FIG.

FIG. 4 is an enlarged cross-sectional view taken along the line CC of FIG.

[Explanation of symbols]

1 Intermediate Plate 2 Intake Hole 3 Intake Manifold 4 Exhaust Hole 5 Exhaust Manifold 6 Boundary 7 Heat-Resistant Elastic Metal Plate 8 Exhaust Opening Hole 9 Half Bead 10 Rubber Coated Metal Plate 11 Intake Opening Hole 12 Mountain Bead 13 Bolt Hole 14 Insulating Material

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Creator Tomoyoshi Uogari 2-1-1 Kano, Higashi-Osaka City, Osaka Prefecture Japan Gasket Co., Ltd. (72) Tomohiro Yasui 2-chome, Toyota-cho, Kariya City, Aichi Prefecture Toyota Loom Works Co., Ltd. (72) Inventor Kazuya Yoshishima 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Corporation

Claims (3)

[Scope of utility model registration request] 1. A gasket for an engine in which a contact surface of an intake manifold and a contact surface of an exhaust manifold are on the same plane, and the manifolds are close to each other, and an intake manifold portion 3 having an intake hole 2 is formed. And the exhaust manifold portion 5 having the exhaust hole 4 formed therein is formed by one intermediate plate 1.
Above and below the intermediate plate 1, the intake manifold portion 3 is laminated with rubber coated metal plates 10 each having an intake opening 11 corresponding to the intake hole 2 and a bead formed around the intake opening 11.
The exhaust manifold portion 5 has an exhaust opening 8 corresponding to the exhaust hole 4 and is laminated with an elastic metal plate 7 around which a bead is formed, and the exhaust manifold portion 5 and the boundary between the exhaust manifold portion 5 and the intake manifold portion 3 are stacked. Bolt hole 1 in part 6
Metal gasket for manifolds, which is characterized by having opened 3. 2. The metal gasket for a manifold according to claim 1, wherein a heat insulating material 14 is laminated on a bolt hole 13 formed at a boundary portion 6 between the exhaust manifold portion 5 and the intake manifold portion 3. 3. The metal gasket for a manifold according to claim 1, wherein the intermediate plate 1 is a metal plate, a heat insulating ceramic plate, a heat insulating mica sheet, a heat insulating expanded graphite sheet, or a heat insulating aramid sheet.