JP2005140303A - Metal laminated gasket - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a metal laminated gasket having good sealing performance in which distribution of surface pressure generated in a peripheral direction of a cylinder hole is made to be successively smoothly inclined. <P>SOLUTION: A metal laminated gasket 1 incorporating a reinforcing plate has a plurality of cylinder holes 2 and comprises a metal base plate 10 in which a seal means 11 is provided to the cylinder holes 2. While a surface pressure reinforcing plate 20 for reinforcing the surface pressure to the seal means 11 is arranged in a part of the periphery of the cylinder hole 2, an end 20a of the periphery of the cylinder hole 2 in the surface pressure reinforcing plate 20 is formed to be successively inclined. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a metal laminated gasket that is sandwiched and sealed between two members such as a cylinder head and a cylinder block of an internal combustion engine.

  When sealing a joint surface between a cylinder head and a cylinder block (cylinder body) of an automobile engine, a metal cylinder head gasket is sandwiched between them to seal combustion gas, cooling water, lubricating oil, and the like.

  Due to the alloying and miniaturization of engine materials due to the weight reduction of the engine, the rigidity of the cylinder block and the cylinder head tends to be reduced. There is a fear that the seal surface pressure around the (chamber hole) becomes uneven. In particular, various ingenuities have been made for the portion between the cylinder holes because the surface pressure tends to decrease.

  As one of them, there is a method in which a surface pressure reinforcing plate is partially arranged in a seal portion around the combustion chamber to reinforce the reduced surface pressure in that portion (for example, see Patent Document 1).

However, in this method, there is a step due to the plate thickness at the boundary between the portion where the reinforcing plate is inserted and the portion where the reinforcing plate is not inserted, and there may be a portion where the surface pressure is not generated in that portion, and gas leakage from there is a problem. ing. In particular, in a small engine with a small tightening force, gas leakage tends to occur frequently. Therefore, the surface pressure reinforcing method using this reinforcing plate is an effective method for strengthening the partial seal, but it is necessary to consider and select the compatibility with the engine. Since the factors such as the rigidity of the head and the cylinder internal pressure are involved in a complicated manner, there is a problem that it is difficult to make the determination.
Japanese Patent Publication No. 03-46661

  The present invention has been made in order to solve this problem, and an object of the present invention is to provide a metal with good sealing performance capable of continuously and smoothly distributing the surface pressure distribution generated in the circumferential direction of the cylinder bore. It is to provide a laminated gasket.

  In order to achieve the above object, the metal laminated gasket according to the present invention has a plurality of cylinder holes, and a metal laminated gasket with a reinforcing plate composed of a metal substrate provided with sealing means in the cylinder holes. A surface pressure reinforcing plate for reinforcing the surface pressure with respect to the sealing means is disposed between the cylinder holes or a part of a single cylinder, and the circumferential end of the cylinder hole of the surface pressure reinforcing plate is continuously inclined. Formed and configured.

  In other words, the present invention eliminates a steep step like the boundary portion of the conventional reinforcing plate by providing an inclination that gradually reduces the thickness of the tip of the reinforcing plate, thereby reducing the surface pressure of the boundary. The surface pressure distribution is improved in the portion where the surface pressure is not generated due to the level difference. There are two methods for forming the slope at the tip of the reinforcing plate. There are a method of tilting both the upper and lower surfaces of the reinforcing plate and a method of tilting one of the upper and lower surfaces of the reinforcing plate. In terms of functionality, both are not significantly different.

  Further, in the metal laminated gasket with a reinforcing plate, the metal laminated gasket comprising a metal substrate having a plurality of cylinder holes and provided with sealing means in the cylinder holes, the cylinder holes on both sides are interposed between the cylinder holes. A surface pressure reinforcing plate that simultaneously reinforces the surface of the sealing means is disposed, and a circumferential end of the cylinder hole of the surface pressure reinforcing plate is formed in a continuous inclination.

  According to this configuration, by reinforcing the surface pressure with the same surface pressure reinforcing plate with respect to the sealing means of the sealing target holes on both sides, the surface pressure reinforcing plate is made easy to handle and the number of parts is reduced. In the direction in which the sealing target holes are arranged between the sealing target holes, the surface pressure reinforcing plate is continuously provided as a single sheet, and no step is generated, so that the surface pressure distribution can be made gentle.

  Also, by forming the circumferential end of the hole to be sealed of the surface pressure reinforcing plate in a continuous slope, the step at the circumferential end of the hole to be sealed can be eliminated or significantly reduced. The surface pressure distribution in this direction can also be a gentle distribution.

  As described above, according to the metal laminated gasket of the present invention, the following effects can be obtained.

  Since the circumferential end of the cylinder hole of the surface pressure reinforcing plate is formed in a continuous inclination and the inclination of the tip of the reinforcing plate gradually decreases, the conventional surface pressure reinforcing plate It is possible to eliminate a steep step such as a boundary portion and to generate a gentle surface pressure distribution.

  In addition, since the end of the surface pressure reinforcing plate is formed in a continuous slope and the end of the surface pressure reinforcing plate is formed gently, the components such as the gasket component plate and engine member that the surface pressure reinforcing plate contacts A large stress concentration due to the contact of the end portion of the surface pressure reinforcing plate with respect to the member sandwiching the laminated gasket is eliminated, and damage to the component plates of the metal laminated gasket and the engine member can be prevented.

  Furthermore, when surface pressure reinforcement is performed with the same surface pressure reinforcing plate for the cylinder hole sealing means on both sides, the surface pressure reinforcing plate is continuously provided in the direction in which the cylinder holes are arranged between the cylinder holes. The generation of the step is eliminated, and the generated surface pressure distribution can be made gentle. Also, the circumferential end of the cylinder hole of the surface pressure reinforcing plate should be formed in a continuous slope so that the step at the end of the surface pressure reinforcing plate can be eliminated or significantly reduced in the circumferential direction of the cylinder hole. Therefore, the surface pressure distribution in this direction can also be made gentle. Therefore, an appropriate seal surface pressure distribution that changes gently can be obtained, and the sealing performance can be improved.

  Next, an embodiment of a metal laminated gasket according to the present invention will be described with reference to the drawings.

  As shown in FIG. 1, a metal laminated gasket 1 according to a first embodiment of the present invention is a cylinder head gasket that is sandwiched between a cylinder head and a cylinder block (cylinder body) of an engine. Seals the high-temperature and high-pressure combustion gas in the cylinder bore and liquid such as cooling water and oil in the cooling water passage and cooling oil passage.

  2 to 5 and FIG. 7 are schematic explanatory diagrams, in which the thickness of the metal laminated gasket 1 and the dimensions and aspect ratios of the beads, the surface pressure reinforcing plates, and the like are different from the actual ones. The seal part is exaggerated to make it easier to understand.

  As shown in FIG. 1, the metal laminated gasket 1 of the present invention is composed of a single metal substrate 10 such as a stainless annealed material (annealed material), a stainless tempered material (spring steel plate), a mild steel plate or the like. These metal substrates 10 are manufactured according to the shape of an engine member such as a cylinder block, and are formed with a cylinder hole 2, a liquid hole 3 for circulating cooling water and engine oil, a bolt hole 4 for fastening bolts, and the like. The

  A bead 11 is provided as a sealing means around the cylinder hole 2 which is the hole to be sealed.

  In the present invention, a surface pressure reinforcing plate 20 having a planar shape as shown in FIG. 2 is disposed between the cylinder holes 2 and 2. The surface pressure reinforcing plate 20 simultaneously reinforces the surface pressure with respect to beads (seal means) 11 and 11 which are seal means for the cylinder holes 2 and 2 on both sides. That is, the surface pressure reinforcing plate 20 on both sides is locally subjected to surface pressure reinforcement by one continuous surface pressure reinforcing plate 20.

  Further, in the present invention, as shown in FIG. 2 and FIG. 3B, the circumferential end 20a of the cylinder hole 2 of the surface pressure reinforcing plate 20 has a gentle continuous inclination from the portion of the chain line. Formed. That is, in the direction (Y direction) perpendicular to the direction (X direction) in which the cylinder holes 2 and 2 of the surface pressure reinforcing plate 20 are arranged, the thickness thereof is gradually reduced so that the end portion 20a does not form a step.

  Further, another embodiment of the surface pressure reinforcing plate according to the present invention is shown in FIGS. That is, FIG. 4A shows a surface pressure reinforcing plate 20A whose planar shape is a drum shape, and FIG. 4B shows an X-shaped surface pressure reinforcing plate 20B. The surface pressure reinforcing plate 20 in FIG. 2 and the surface pressure reinforcing plate 20B in FIG. FIG. 5 shows a surface pressure reinforcing plate 20A in which the end portion 20Aa is formed in an arcuate inclination. In addition, this invention is not limited to the shape illustrated in these FIGS.

  And according to the metal lamination | stacking type | mold gasket 1 of embodiment of this invention as shown in FIGS. 1-3, surface pressure distribution as shown in FIG. 6 can be obtained.

  That is, as shown in FIG. 6 (a), the surface pressure is reinforced by the same surface pressure reinforcing plate 20 with respect to the beads 11 and 11 of the cylinder holes 2 and 2 on both sides. In the X direction in which the cylinder holes 2 and 2 are aligned, the surface pressure reinforcing plate 20 is continuously provided, so that no step is generated, and the generated surface pressure distribution becomes gentle.

  Further, as shown in FIG. 6 (b), the circumferential end 20a of the cylinder hole 2 of the surface pressure reinforcing plate 20 is formed with a gently continuous slope, so that also in the circumferential direction of the cylinder hole 2, The step at the end 20a of the surface pressure reinforcing plate 20 can be eliminated, and the surface pressure distribution in this direction is also a gentle distribution.

  Further, as shown in FIG. 7, the metal laminated gasket 1 </ b> C according to the second embodiment of the present invention has a planar pressure reinforcing plate 20 </ b> C having a planar shape as shown in FIG. 8 around the cylinder hole 2. It is the structure arrange | positioned in part. The surface pressure reinforcing plate 20C locally reinforces the bead (sealing means) 11 serving as the sealing means of the cylinder hole 2 with local pressure. An end portion 20Ca in the circumferential direction of the cylinder hole 2 of the surface pressure reinforcing plate 20C is formed to have a gentle continuous inclination from a portion indicated by a one-dot chain line. That is, in the circumferential direction of the cylinder hole 2 of the surface pressure reinforcing plate 20, the thickness is gradually reduced so that the end 20Ca does not form a step. Note that the end 20Ca may be formed in an arcuate inclination.

  Also in the metal laminated gasket 1C of the second embodiment, the surface pressure distribution similar to that shown in FIG. 6B is obtained in the end portion 20Ca of the surface pressure reinforcing plate 20C in the circumferential direction of the cylinder hole 2. Can be obtained. That is, since the end portion 20Ca in the circumferential direction of the cylinder hole 2 of the surface pressure reinforcing plate 20 is formed with a gently continuous slope, the end portion 20Ca of the surface pressure reinforcing plate 20C also in the circumferential direction of the cylinder hole 2. The step can be eliminated, and the surface pressure distribution in this direction is also a gentle distribution.

It is a top view showing the metal lamination type gasket of a 1st embodiment concerning the present invention. It is a perspective view which shows the surface pressure reinforcement board used with the metal laminated | stacked gasket of 1st Embodiment which concerns on this invention. 2 is a cross-sectional view of the surface pressure reinforcing plate of FIG. 2, (a) is a cross-sectional view in the direction in which the cylinder holes are arranged (X direction), and (b) is a direction perpendicular to the direction in which the cylinder holes are arranged (X direction) ( It is sectional drawing of a (Y direction). It is a top view which shows other embodiment of the surface pressure reinforcement board which concerns on this invention, (a) shows a drum-shaped surface pressure reinforcement board, (b) shows an X-shaped surface pressure reinforcement board. It is sectional drawing which shows other embodiment of the surface pressure reinforcement board which concerns on this invention, and shows the surface pressure reinforcement board which has circular arc-shaped inclination. FIGS. 3A and 3B are diagrams schematically illustrating a surface pressure distribution generated by the surface pressure reinforcing plate in FIG. 2, in which FIG. 2A illustrates a pressure distribution in a direction (X direction) in which cylinder holes are arranged, and FIG. The pressure distribution in the direction perpendicular to the vertical direction (X direction) (Y direction) is shown. It is a top view which shows the metal laminated | stacked gasket of 2nd Embodiment which concerns on this invention. It is a figure which shows the surface pressure reinforcement board used with the metal laminated | stacked gasket of 2nd Embodiment based on this invention, (a) is a top view, (b) is a side view.

Explanation of symbols

1,1C metal laminated gasket
2 Cylinder hole 10 Metal substrate 11 Bead (sealing means)
20, 20A, 20B, 20C Surface pressure reinforcing plate 20a, 20Aa, 20Ba, 20Ca End

Claims (1)

In a metal laminated gasket with a reinforcing plate comprising a metal substrate having a plurality of cylinder holes and provided with sealing means in the cylinder holes, a surface that reinforces surface pressure against the sealing means in a part around the cylinder holes A metal laminate type gasket in which a pressure reinforcing plate is provided and a circumferential end of the cylinder hole of the surface pressure reinforcing plate is formed in a continuous inclination.

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