JPH0735855U - Metal gasket - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a metal gasket capable of improving the assembling property and sealing property of a bead plate by reducing the warp of the bead plate. [Structure] Three openings 12 are formed at positions corresponding to three exhaust ports formed in a cylinder head, respectively.
An elastic metal plate in which independent annular beads 14 surrounding the openings 12 are formed in the vicinity of the opening edges of the two openings 12, and a pair of outer annular beads 14A protrudes in a direction opposite to the inner one annular bead 14B. A bead plate 11 made of

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a metal gasket having a bead plate made of an elastic metal plate, which is mounted between a set of sealed members having a plurality of sets of communication passages communicating with each other.

[0002]

[Prior art]

 Generally, multiple combustion chambers are hermetically sealed or multiple exhaust branch pipes or intake branch pipes are exhausted between the engine cylinder block and cylinder head, or between the cylinder head and exhaust manifold or intake manifold. Metal gaskets are attached to communicate with the ports and intake ports in an airtight manner. As the metal gasket, those having a bead plate made of an elastic metal plate and a sub-plate superposed on the bead plate, and those having only the bead plate are widely adopted. An opening is formed at a position corresponding to the chamber, the exhaust passage, and the intake passage, and an annular bead that surrounds the opening is formed near the opening edge of the opening. Usually, when a plurality of openings are provided, annular beads are independently provided near the opening edges of the plurality of openings to independently seal a plurality of cylinders, a plurality of exhaust passages, and a plurality of intake passages. It is configured as follows.

[0003]

[Problems to be solved by the device]

 By the way, since the beads formed on the bead plate are projected in the same direction by press molding or the like, there is a problem that the bead plate is curved and warped as a whole with the projecting side of the bead outside the arc. . For this reason, positioning work between the members to be sealed and the bead plate with respect to the sub-plate becomes very complicated, and the assemblability is significantly reduced, making it difficult to respond to automatic assembly. There is a problem that it takes a lot of work time and the warp increases as the height of the bead increases, so that it is difficult to improve the sealing property by increasing the height of the bead.

An object of the present invention is to provide a metal gasket that can reduce warp of a bead plate and improve assemblability and sealability.

[0005]

[Means for Solving the Problems]

 The metal gasket according to claim 1 is a metal gasket having a plurality of sets of communication passages that communicate with each other. The metal gasket is mounted between members to be sealed, and the opening is provided at a position corresponding to the plurality of sets of communication passages. A plurality of openings, each of which has a separate annular bead that surrounds the opening near the opening edge, and at least one annular bead of the plurality of annular beads in a direction opposite to the other annular beads. It is equipped with a bead plate made of a protruding elastic metal plate. Here, as in claim 2, the plurality of annular beads may be alternately projected in opposite directions, and as in claim 3, a sub-plate may be provided to be superposed on the bead plate. .

[0006]

[Action]

 In the metal gasket according to claim 1, since at least one annular bead of the plurality of annular beads formed on the bead plate is projected in the opposite direction to the other annular beads, the at least one of the at least one annular bead is projected. The part of the bead plate near the annular bead warps in the opposite direction to the part of the bead plate near the other annular beads, and it is possible to reduce the warpage of the entire bead plate.

When the plurality of annular beads are alternately projected in the opposite directions as in the second aspect, the warp of the bead plate can be uniformly reduced as a whole. In the metal gasket having a so-called multi-layer structure in which the sub-plate is superposed on the bead plate as in claim 3, the bead plate can be less warped as in the first aspect, and the bead plate is warped. By reducing the number, it is possible to reduce the number of joints between the bead plate and the sub plate.

[0008]

Embodiments Embodiments of the present invention will be described below with reference to the drawings. The present invention is a case where the present invention is applied to a metal gasket mounted between a cylinder head and an exhaust manifold of a V6 cylinder engine. As shown in FIG. 1, three exhaust ports 2 are opened in a side wall of a cylinder head 1 (which corresponds to one sealed member) of one bank of a V-type engine, and the cylinder head 1 has an exhaust port. An exhaust manifold (corresponding to the other member to be sealed) 4 having three exhaust branch pipes 3 connected to 2 is fixed, and between the cylinder head 1 and a flange member 5 provided at the upstream end of the exhaust manifold 4. A metal gasket 10 that connects the three exhaust branch pipes 3 and the three exhaust ports 2 in an airtight manner is mounted, and the metal gasket 10 is fixed to the cylinder head 1 together with the flange member 5 via a plurality of bolts 6. ing.

As shown in FIGS. 2 to 5, the metal gasket 10 is composed of a bead plate 11 made of a flat metal plate having elasticity, and the bead plate 11 is the cylinder head 1 of the flange member 5. Is formed in substantially the same shape as the mating surface on the side, the bead plate 11 has three oval-shaped openings 12 having substantially the same shape as the exhaust port 2 at positions corresponding to the three exhaust ports 2, A plurality of bolt insertion holes 13 through which 6 is inserted are formed, and independent annular beads 14 that surround the openings 12 are formed near the opening edges of the three openings 12, respectively, and a pair of outer annular beads 14A. Is projected to the cylinder head 1 side, and one annular bead 14B on the inner side is projected to the flange member 5 side. However, the pair of outer annular beads 14A may be projected toward the flange member 5 side, and the one inner ring bead 14B may be projected toward the cylinder head 1 side.

Next, the operation of the metal gasket 10 will be described. Of the three annular beads 14 formed on the bead plate 11, a pair of outer annular beads 14A are projected toward the cylinder head 1 side, and one inner annular bead 14B is projected toward the flange member 5 side. As shown by the solid line in FIG. 5, the gasket 10 warps by drawing a gentle sine curve, but unlike the conventional example illustrated by the phantom line, it does not curve greatly in one direction and warps, and the warp amount C1 is The warp amount C2 of the conventional metal gasket 10 is significantly smaller.

As described above, since the warpage of the metal gasket 10 is reduced, the assembling property of the metal gasket 10 between the cylinder head 1 and the exhaust manifold 4 is improved, and the automatic assembling is facilitated. Further, as shown in FIG. 6, when the height of the annular bead 14 is increased, the warp of the bead plate 11 is increased in direct proportion thereto, but the ratio thereof is smaller than that of the conventional bead plate 11, so that the annular bead 11 is warped. By setting the height of the bead 14 large, it is possible to improve the sealing performance of the metal gasket 10.

Here, the present invention can be applied to a laminated metal gasket 20 having a plurality of bead plates 11 and sub plates 21 as in another embodiment shown in FIG. In this case, the plurality of bead plates 11 and the sub-plates 21 are joined together by caulking, eyelets, rivets, spot welding, etc. in a superposed state. Since it is possible to reduce the number of parts, the metal gasket 20 can be easily assembled and the manufacturing cost thereof can be reduced. Instead of the annular bead 14, a disc spring-shaped annular bead 30 as shown in FIG. 8 may be formed on the peripheral edge of the opening. Even in this case, as in the above-described embodiment, the protruding direction of the annular bead 30 is alternately reversed.

When two or four or more openings 12 are formed in the bead plate 11 and the annular beads 14 and 30 are formed corresponding to the openings 12, the annular beads 14 and 30 are formed. The projecting directions of are alternately or inverted in a predetermined pattern. In this embodiment, the present invention is applied to the metal gaskets 10 and 20 mounted between the cylinder head 1 and the exhaust manifold 4 of the V6 cylinder engine, but it is mounted on the cylinder head 1 and the intake manifold pipe. The present invention can be applied to a metal gasket, a metal gasket mounted between the cylinder head and the exhaust manifold or the intake manifold of an in-line multi-cylinder engine, or a metal gasket mounted between the cylinder head and the cylinder block. The present invention can also be applied to metal gaskets of equipment other than engines such as air pumps.

[0014]

[Effect of device]

 As described in the section of the action, the following effects can be obtained. According to the metal gasket of claim 1, the warp of the entire bead plate is reduced by a simple structure in which at least one annular bead of the plurality of annular beads is projected in the direction opposite to the other annular beads. It becomes possible. This improves the assembling property of the bead plate and facilitates automatic assembling, and the bead height can be increased and the sealing property can be improved without increasing the warp of the entire bead plate. The effect such as that can be obtained.

According to the metal gasket of the second aspect, the warp of the bead plate can be uniformly reduced as a whole, and the assembling property of the bead plate can be further improved. According to the metal gasket of claim 3, the assemblability of the bead plate to the sub plate can be improved, and the number of connecting points between the bead plate and the sub plate can be reduced, thereby reducing the manufacturing cost of the metal gasket. Can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of the vicinity of a metal gasket of an engine

[Figure 2] Front view of the metal gasket

FIG. 3 is a sectional view taken along line III-III in FIG.

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

5 is a sectional view taken along line VV of FIG.

FIG. 6 is a diagram showing the relationship between the height of the annular bead and the warp of the bead plate.

FIG. 7 is a vertical cross-sectional view around an annular bead according to a modification.

FIG. 8 is a vertical cross-sectional view of a metal gasket according to another embodiment in the vicinity of an annular bead.

[Explanation of symbols]

1 Cylinder Head 12 Opening Part 2 Exhaust Port 13 Bolt Insertion Hole 3 Exhaust Branch Pipe 14 Annular Bead 4 Exhaust Manifold 14A Annular Bead 5 Flange Member 14B Annular Bead 6 Bolt 20 Laminated Metal Gasket 10 Metal Gasket 21 Subplate 11 Bead Plate 30 Annular bead

Claims (3)

[Scope of utility model registration request] 1. A metal gasket mounted between a set of sealed members having a plurality of sets of communication passages communicating with each other, wherein openings are respectively formed at positions corresponding to the plurality of sets of communication passages. , An elastic metal in which independent annular beads surrounding the openings are formed in the vicinity of the opening edges of the plurality of openings, and at least one annular bead of the plurality of annular beads is projected in a direction opposite to the other annular beads. A metal gasket characterized by having a bead plate made of a plate. 2. The metal gasket according to claim 1, wherein the plurality of annular beads are alternately projected in opposite directions. 3. The metal gasket according to claim 1, further comprising a sub-plate superposed on the bead plate.