JPH04126060U - metal plate gasket - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent metal plate gaskets in which the distribution of the sealing beads surrounding sealed parts such as cylinder bores, water holes, oil holes, etc. is unbalanced between the upper and lower sides of the gasket, or between the left and right sides. When clamped between joint surfaces and tightened,
Since uneven tightening occurs and there are areas where the surface pressure is weak locally, the unbalanced distribution of the sealing beads is compensated to prevent uneven tightening from occurring. [Configuration] Seal beads 10, 11, 12, 13, 1
Dummy beads 15 and 16 for preventing uneven tightening that do not surround the part to be sealed are provided on the side where the distribution of 4 is small. Alternatively, an outer bead 25 is provided that surrounds the sealing bead that surrounds the sealed portion on the side where the distribution of the sealing bead is less. Alternatively, a plurality of small protrusions 26 are provided in place of a dummy bead or outer bead. These beads or small protrusions compensate for the imbalance in the distribution of the sealing beads.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is a metal plate gasket used for engine cylinder head gaskets, etc. It is related to.

0002

[Conventional technology]

It is made of an elastic metal plate and seals parts to be sealed such as cylinder bores, water holes, oil holes, etc. A single metal plate made of a single substrate with a sealing bead surrounding the sealing part. A laminated metal plate glass made by laminating a socket or the above board and a sub-plate or middle plate, etc. Skets are widely used in engine cylinder head gaskets, etc. Kaka In metal plate gaskets, sealed parts such as water holes and oil holes, and the parts surrounding these The sealing bead is uneven on the top and bottom sides of the board or on the left and right sides. It is often distributed in many areas.

0003 For example, in engines with push rods or engines with secondary combustion chambers, These engines have a shrod or auxiliary combustion chamber on one side of the engine. Metal plate gaskets used as cylinder head gaskets are also sealed. and a sealing bead surrounding it on one side of the top and bottom sides of the board. They are more concentrated and the distribution of sealing beads is unbalanced.

0004 In addition, the recent trend is to improve oil lubricity with the improvement of engine performance. The size of the oil return hole has been increased to create a seal between the side with the oil return hole and the side without the oil return hole. This increases the imbalance in the distribution of beads for beads. To improve cooling capacity When installing a large water hole for cooling water return, the side with this water hole and the side without it are the same. Otherwise, the sealing bead may become unbalanced.

[0005]

[Problem that the idea aims to solve]

As shown in the example above, the sealing bead formed on the board also covers the upper and lower sides of the board. or if the distribution is unbalanced between the left and right sides, check the engine system. Place a metal plate between the joint surfaces to be sealed, such as the joint surface between the cylinder block and cylinder head. When the gasket is clamped and the bolt is tightened to tighten the gasket, the seal The side with fewer sealing beads is easier to tighten, and the side with more sealing beads is difficult to tighten. The metal plate gasket is tightened unevenly, that is, unevenly tightened. For this reason Localized areas with weak surface pressure may occur, and leakage may occur from these areas of weak surface pressure. There is.

[0006] In this invention, the distribution of the sealing beads surrounding the part to be sealed is uneven as described above. Even in the case of a lance, uneven tightening will not occur when clamped between the joint surfaces and tightened. We provide metal plate gaskets that can ensure uniform surface pressure distribution. It is something that

[0007]

[Means to solve the problem]

In order to achieve the above purpose, the metal plate gasket of the present invention has a seal A dummy bead is attached to the side with fewer beads to prevent uneven tightening that does not surround the part to be sealed. or to surround parts to be sealed such as water holes and oil holes that exist on the side with fewer beads. An outer bead surrounding the sealing bead is added to the outside of the sealing bead. In addition, this invention In this case, instead of adding a dummy bead or outer bead as described above, a seal is used. Provide multiple small protrusions on the side with fewer beads to prevent uneven tightening.

[0008]

[Effect]

In this invention, as mentioned above, dummy beads are also placed on the side with fewer sealing beads. or add outer beads or small protrusions, these added beads or The small protrusions compensate for the unbalanced distribution of the sealing bead, and the metal plate gasket Seal bead, dummy bead and outer bead as well as small The distribution of the entire protrusion can be balanced. Therefore, the metal plate gasket of this invention When clamping the joint between the joint surfaces and tightening, there is no possibility of uneven tightening. There will be no local areas where the surface pressure is weak.

[0009] The dummy bead, outer bead, or small protrusion has the function and effect of preventing uneven tightening as described above. In order to achieve this effect, the metal plate gasket of this invention must be sandwiched between the joint surfaces and tightened. When the dummy bead, outer bead or small protrusion is the same as the sealing bead, , it is necessary to receive stress from the joint surface and to exert the reaction force on the joint surface. Ru. Places that are not subject to such stress, for example, when a gasket is installed between joint surfaces A hole is provided on one side of the joint surface. Dummy bead (dummy bead is installed in such a place to prevent the board from warping) ) may not work as a dummy bead to prevent uneven tightening; -Does not apply to beads.

0010

【Example】

The details of the present invention will be explained below based on examples and drawings. identical in drawings The symbols indicate the same parts. Figure 1 shows an example of the metal plate gasket of the present invention. 2 is a cross-sectional view taken along line A-A in FIG. 1, and FIG. 3 is a cross-sectional view taken along line B-B in FIG. FIG. 4 is a cross-sectional view taken along line CC in FIG. Not shown in the top view For simplicity, the beads are represented by dotted lines.

[0011] In the figure, 1 and 2 are substrates made of elastic metal plates such as stainless steel plates. Respectively, cylinder bore 4, water hole 5, bolt hole/oil supply hole 6, bolt hole 7, oil return A protrusion type that includes a hole 8 and a large water hole 9, and also surrounds and seals the cylinder bore 4. a sealing bead 10, a stepped sealing bead 11 surrounding and sealing the water hole 5; , a protrusion-shaped sealing bead 12 that surrounds and seals the oil supply hole 6 that also serves as a bolt hole, and an oil return hole. A stepped sealing bead 13 surrounds and seals the water hole 8 and a large water hole 9 is surrounded. It is provided with a sealing bead 14 that wraps around and seals. 3 is stainless steel plate, iron plate, etc. An intermediate plate made of a metal plate, which has cylinder bores 4, water holes 5, etc. like substrates 1 and 2. It is equipped with a hole. Substrates 1 and 2 are laminated on both sides of intermediate plate 3 to form a metal plate gasket. is configured.

0012 Looking at the distribution of the sealing beads 10 to 14 in this example, FIG. As shown, the water hole 5 and the sealing bead 11 surrounding it are cylindrical. Almost symmetrically distributed with respect to the center line connecting the centers of dowels 4, and above the center line It is distributed in a well-balanced manner on the upper side of the area and on the lower side below the center line. this On the other hand, the bolt hole/oil supply hole 6 and the sealing bead 12 surrounding it are made of gas. A sealing bead on the upper and lower sides that exists only on the upper side of the face of the sket. This is causing an imbalance.

[0013] On the left end side of the gasket surface, there is a large water hole 9 only on the upper side and a shell surrounding it. A sealing bead 14 is provided between the sealing bead 14 and the lower side where these do not exist. This contributes to the imbalance. On the right side of the gasket, the bottom An oil return hole 8 and a sealing bead 13 surrounding the oil return hole 8 are provided only on the side. An unbalance of the sealing bead occurs between the upper side and the upper side lacking these. on the other hand , regarding the arrangement of the bolt holes through which the bolts that tighten the metal plate gasket are inserted, Usually, it is designed with the cylinder bore gasket as the most important, so it can also be used as a bolt hole. Each bolt hole, including the bolt hole of the oil supply hole 6, is located around each cylinder bore in the upper, lower, left and right directions. Right: Almost symmetrical.

[0014] Therefore, if the metal plate glass has only sealing beads 10 to 14 as beads, When the sket is held between the joint surfaces and the bolt is tightened, the sealing The lower side, where there are fewer beads, tightens well, and the upper side, where there are many sealing beads, is difficult to tighten. This results in a closer tightening state. In this example, both the upper and lower sides are well-balanced. Place the following on the bottom side of the side with less sealing bead so that it can be tightened. A dummy bead is provided.

[0015] In other words, the bolt on the lower side corresponding to the bolt hole of the bolt hole/oil supply hole 6 on the upper side A protrusion-shaped dummy bead 15 is provided surrounding the water hole 7, and a large water hole 9 on the upper side is provided. A step-shaped dummy bead is placed at a lower position symmetrical to the sealing bead 17 surrounding the sealing bead 17. 16 will be provided. Place dummy bead 15 like this on the lower side where there are fewer sealing beads. By adding and providing 16, when the metal plate gasket is tightened, Both the upper and lower sides of the gasket can be tightened in a well-balanced manner. In addition, da The mead bead 15 surrounds the bolt hole 7, but the bolt hole 7 requires sealing. First, since it does not correspond to the sealed part, the dummy bead 15 does not surround the sealed part. It is a bead.

[0016] In the embodiment shown in Fig. 1, oil is returned only to the lower side on the right end side of the metal plate gasket. A gasket is provided with a hole 8 and a sealing bead 13 surrounding it. On the right end side, there is an imbalance where there are more sealing beads on the bottom side and fewer on the top side. Since there is a lance, in order to compensate for this, a dummy surrounds the bolt hole on the right end of the upper side. A bead 17 is added. With this invention, a dummy bead is placed on the side with fewer sealing beads. Adding means that the entire upper side and lower side of the metal plate gasket or the left Seal to compensate for imbalance of sealing beads across the entire side and across the right side. The above dummy beads can be used not only when adding a dummy bead to either side with fewer beads. For example, if there is a mead bead 17 on the right or left side of the gasket, A dummy bead is used to compensate for the unbalance of the sealing bead between the upper and lower sides. This also includes the case where .

[0017] However, in the embodiment shown in FIG. Since the distribution of beads is more on the upper side and less on the lower side, dummy bead 17 is omitted. You can also Also, dummy beads 15 and 17 completely surround the bolt hole 7. It is not necessary to do so, as long as the bead distribution is approximately balanced. 7 may be formed so as to partially surround it. The dummy bead 16 is also quadrilateral, etc. It is not necessarily necessary to form it into a closed figure. Made of multiple filament beads arranged side by side. There may be.

[0018] FIG. 5 shows a sectional view corresponding to FIG. 3 for another embodiment, and in FIG. Step-shaped dummy beads 16 are provided on both plates 1 and 2, but in the case of FIG. A protrusion-shaped dummy bead 18 with a large spring constant is provided on only one substrate 1 to create a balance. I'm taking a lot of time. FIG. 6 is a sectional view corresponding to FIG. 3 regarding yet another embodiment. In this case, a dummy bead 19 is provided on the intermediate plate 3.

[0019] FIG. 7 is a top view showing another embodiment of the metal plate gasket of the present invention. In the example, the water hole 5, oil hole 20 and bolt hole 7 connect the center of the cylinder bore 4. The water holes 5 are arranged almost symmetrically up and down with respect to the center line of the The sealing bead 21 that surrounds the oil hole 20 and the oil hole 20 is attached to the gasket. Although they are distributed in a well-balanced manner between the upper and lower sides, the push rod holes 22 and A sealing bead 23 surrounding this is provided only on the upper side of the gasket. , because of this, the distribution of the sealing bead is uneven between the upper and lower sides of the gasket. is on. Therefore, in order to compensate for this, the dummy bead 24 is used as a sealing bead. It is added to the lower side almost vertically symmetrically with the door 23.

[0020] In all of the above embodiments, a dummy bead surrounding a bolt hole that is not a part to be sealed is used. , or exists near or between the holes that are the part to be sealed, and surrounds the hole that is the part to be sealed. Add a dummy bead that is not wrapped to prevent uneven tightening to the side with fewer sealing beads. However, the bead used in this invention to prevent uneven tightening is designed to prevent such dams. -It is not limited to the bead, but can surround the part to be sealed as shown in the top view of Figure 8. It may be formed on the outside of the sealing bead so as to surround the bead.

[0021] In the metal plate gasket shown in Fig. 8, the water hole 5 and the seal surrounding it are The beads 11 are provided almost symmetrically above and below the center line connecting the centers of the cylinder bores. However, the oil hole 20 and the sealing bead 21 surrounding it are provided only on the upper side. distribution, with more sealing beads on the upper side of the gasket and less on the lower side. It has become. To compensate for this, the gasket shown in Figure 8 is designed to prevent uneven tightening. The bead is placed around the sealing bead 11 surrounding the water hole 5 on the lower side. An outer bead 25 surrounding the outer bead 11 is added. The outer bead 25 is as shown. It may completely surround the sealing bead 25, or the sealing bead may completely surround the sealing bead 25. It may also surround a part of the code. The outer bead 25 completes the sealing bead 11. In the case of completely surrounding the water hole 5, a double bead surrounding the water hole 5 is formed. Become. Usually, the spring constant of the outer bead 25 is the spring constant of the inner sealing bead 11. , but the spring constant of the outer bead is larger than that of the inner sealing bead. There is no harm in choosing as many as you want.

[0022] As mentioned above, place dummy beads or outer beads on the side where there is less distribution of sealing beads. There are fewer sealing beads instead of having more beads to balance the bead distribution. Multiple small protrusions are provided on the side to prevent uneven tightening, preventing uneven distribution of the sealing bead. It may also be possible to compensate for the An example in which such a row of small protrusions is provided is shown in FIG. and shown in FIG. FIG. 9 is a top view of this embodiment, and FIG. 10 is a top view of this embodiment. -D line sectional view.

[0023] In the embodiment shown in FIGS. 9 and 10, the push rod hole 22 and Since the sealing bead 23 surrounding the gasket exists only on the upper side of the gasket, the gas The distribution of sealing beads is unbalanced between the upper and lower sides of the jacket. . To compensate for this, a sealing bead 23 is installed on the lower side where there are fewer sealing beads. The rows 27 and 28 of small protrusions 26 are provided almost symmetrically. The row 27 of small protrusions 26 is They are arranged in a rectangular shape similar to the seal beads surrounding the push rod hole 22, and are arranged in rows. 28 are arranged in two linear rows. This protrusion is shown in the figure for the protrusion in row 27. It may also be a perforated protrusion as shown in 10. Also, this small protrusion is Since it balances the resistance against tightening of the socket, it is not necessarily linear or linear. It is not necessary to arrange them in a row, and there is no problem even if they are arranged in a distributed manner. .

[0024] The metal plate gasket of the present invention has various types other than the embodiments and modified embodiments described above. Various modifications are possible. In the figure, dummy beads, outer beads or small protrusions are shown. In this example, the seal bead protrudes in the same direction as the seal bead. It may be made to protrude in the opposite direction to the protruding direction of the bead. Also, bead for sealing. You can also add a mixture of dummy beads, outer beads, and small protrusions to the side with fewer beads. stomach. Further, substrates 1 and 2 provided with sealing beads were laminated on both sides of the intermediate plate 3. Although the present invention has been illustrated and explained regarding the laminated metal plate gasket of the structure, The metal gasket may be a single sheet metal gasket consisting of one substrate, or is a laminated metal plate gas with a different laminated structure, such as sub-plates laminated on both sides of one substrate. It may be a ket. The present invention also applies to cylinder head gaskets as shown in the figure. Not limited to gaskets, but also when applied to cylinder head gaskets. However, it is not limited to multi-cylinder engines as shown in the figure, but can also be applied to single-cylinder engines. is also applicable.

[0025]

[Effect of the idea]

As mentioned above, the present invention uses a sealing via that is formed on a substrate and surrounds a part to be sealed. The distribution of codes is unbalanced between the top and bottom sides of the board, or between the left and right sides. In the metal plate gasket that is used as the Add a dummy bead or multiple small protrusions that do not surround the part to be sealed to prevent sealing. or a shield surrounding the part to be sealed on the side where the distribution of sealing beads is less. Since there are additional outer beads surrounding the bead for the roll, these additional Compensate for unbalanced sealing bead distribution with beam beads or small protrusions. can be done. Therefore, the metal plate gasket of the present invention has a distribution of sealing beads. Even if it is unbalanced, it will be tightened evenly between the joint surfaces, and the tightening will be uneven. It never becomes a state.

[Brief explanation of drawings]

FIG. 1 is a top view of an embodiment of the metal plate gasket of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG. 1;

FIG. 3 is a sectional view taken along line BB in FIG. 1;

FIG. 4 is a sectional view taken along line CC in FIG. 1;

FIG. 5 is a sectional view corresponding to FIG. 3 of another embodiment of the present invention.

FIG. 6 is a sectional view corresponding to FIG. 3 of still another embodiment of the present invention.

FIG. 7 is a top view of another embodiment of the present invention.

FIG. 8 is a top view of another embodiment of the present invention.

FIG. 9 is a top view of another embodiment of the present invention.

10 is a sectional view taken along line DD in FIG. 9;

[Explanation of symbols]

1 and 2 Board 3 Intermediate plate 4 Cylinder bore 5 Water hole 6 Bolt hole/oil supply hole 7 Bolt hole 8 Oil return hole 9 Large water holes 10, 11, 12, 13, 14, 21 and 23 Seal beads 15, 16, 17 , 18 and 19 Dummy bead 20 Oil hole 22 Push rod hole 25 Outer bead 26 Small projections 27 and 28 Row of small projections

Claims (3)

[Scope of utility model registration request] Claim 1: The distribution of sealing beads surrounding parts to be sealed, such as cylinder bores, water holes, oil holes, etc. provided on a substrate made of an elastic metal plate, is unbalanced between the upper and lower sides or the left and right sides of the substrate. A metal plate gasket characterized in that a dummy bead for preventing uneven tightening that does not surround the part to be sealed is provided on the side with fewer sealing beads. [Claim 2] The distribution of sealing beads that surround parts to be sealed such as cylinder bores, water holes, oil holes, etc. provided on a substrate made of an elastic metal plate is unbalanced between the upper and lower sides or the left and right sides of the substrate. A certain metal plate gasket is characterized in that an outer bead is provided outside the sealing bead that surrounds a portion to be sealed, such as a water hole or an oil hole, which exists on the side with fewer sealing beads. . [Claim 3] The distribution of sealing beads that surround parts to be sealed such as cylinder bores, water holes, oil holes, etc. provided on a substrate made of an elastic metal plate is unbalanced between the upper and lower sides or the left and right sides of the substrate. A metal plate gasket characterized in that a plurality of small protrusions are provided on the side with fewer sealing beads to prevent uneven tightening.