metal seal

Abstract

Metal gasket (1, 10) comprising a bead section (3, 3A, 3B) configured to contact a counterpart sealing surface (101a, 102a, 201a, 202a) to form a sealing section on a main gasket body (2), wherein the bead section (3, 3A, 3B) comprises an arc section (31, 31A, 31B) which, in a state where the metal gasket (1, 10) is not compressed, is convex towards the counterpart sealing surface (101a, 102a, 201a, 202a), and sections with rising butt edges (32, 32A, 32B, 32C) which extend obliquely from the main gasket body (2) towards the arc section (31, 31A, 31B). rising, comprising both butt edges of the arc section (31, 31A, 31B), wherein a connecting section (33, 33A, 33B) between the arc section (31, 31A, 31B) and the section with rising butt edge (32, 32A, 32B, 32C) is designed such that it is convex towards a convex side of the bead section (3, 3A, 3B),wherein the plastic deformation of the total width of the arc section (31, 31A, 31B) is less than the plastic deformation of the connecting section (33, 33A, 33B) and wherein the bead section (3, 3A, 3B) is designed such that, in a state where the metal seal (1, 10) is compressed, the arc section (31, 31A, 31B) forms a flat surface along the mating sealing surface (101a, 102a, 201a, 202a) which provides a wide bearing surface with a uniform bearing pressure.

Description

TECHNICAL AREA

[0001] The present invention relates to a metal gasket and in particular a metal gasket which can form a wide bearing width for a counterpart sealing surface and which can achieve excellent sealing properties even if a blowhole is created in the counterpart sealing surface. BACKGROUND

[0002] In many industrial sectors, including the automotive industry, the use of cast materials in the manufacture of products has increased. Cast parts, for example, produced using aluminum die casting, are used as automotive components such as engines.

[0003] In a casting, cavities can remain after sintering, leading to the formation of blowholes. The material near the surface of the casting is dense, so no blowholes are exposed. However, the casting can be finished by machining to improve its dimensional accuracy and flatness after molding. In this case, machining can expose the blowholes in the surface of the casting, creating the resulting indentations.

[0004] If such recesses are formed in the mating sealing surface of a gasket, the problem arises that the sealing properties of the gasket cannot be adequately achieved. In a gasket, a bead section is deformed by compression under axial bolt forces between two elements, and the stress generated in the bead section at this point seals the mating sealing surface. If, in this case, a recess extending across the contact surface with the bead section is present, the fluid intended to be hermetically sealed can escape through the recess.

[0005] Countermeasures are taken to address this problem, such as hermetically sealing the gap between the mating sealing surface and the gasket by applying a resin or liquid inert gas (FIPG) to the mating sealing surface, and modifying the casting itself to a part with a configuration that has less impact on blowholes. With the smaller design and weight reduction of products in recent years, difficult-to-mold product shapes have increased, making it challenging to control blowholes in the castings. Therefore, the use of innovative solutions for the gasket itself is also required as a countermeasure against blowholes.

[0006] Conventionally proposed sealants include those whose clamping width is uniformly designed by providing a recess in a section of the circumference of their cross-section to prevent twisting and the like that generated during installation (Published Japanese Patent Publication No. 10-318373); a sealant whose cross-section is defined to have a three-part shape to facilitate load reduction, load fluctuation, and the like (Published Japanese Patent Publication No. 2000-356267); and a sealant whose cross-section is defined to have a three-part shape to facilitate improved ease of installation, improved stability of the position for installation, and the like (Published Japanese Patent Publication No. 2003-322257).As far as these sealants are concerned, however, no consideration is given to the countermeasures against the case where the condition of the mating sealing surface is worsened due to the formation of the recesses caused by the blowholes and the like.

[0007] As a countermeasure against the deterioration of the mating sealing surface, seals were proposed (published Japanese patent publications Nos. 2003-322257 and 2011-94667) that are each capable of covering the protrusions and recesses by forming a wide bearing surface for the mating sealing surface. This is achieved by creating an arc segment with a slight curvature and a shape that is convex towards the mating sealing surface, which has a recess formed within it. These seals are each formed by a rubber-like elastic body and are not metal seals with a bead section formed on a metal carrier. Writings on the State of the Art Patent Law

[0008] Patent specification 1: JP-A-H10-318373 Patent specification 2: JP-A-2000-356267 Patent specification 3: JP-A-2003-322257 Patent specification 4: JP-A-2011-94667 SUMMARY OF THE INVENTION PROBLEM TO BE SOLVED BY THE INVENTION

[0009] One object of the present invention is to provide a metal gasket that can form a wide bearing width for a counterpart sealing surface and that can achieve excellent sealing properties, even if blowholes are created in the counterpart sealing surface.

[0010] Other objectives of the present invention will become apparent from the following description. MEANS TO SOLVE THE PROBLEM

[0011] The following inventions achieve these goals. 1. Metal gasket comprising a bead section that comes into contact with a counterpart sealing surface to form a sealing section formed on a gasket main body, wherein the bead section comprises an arc section that is convex towards the counterpart sealing surface, and sections with rising butt edges that rise obliquely from the main sealing body towards the arc section, at both butt edges of the arc section, wherein a connecting section between the arc section and the section with rising butt edge is designed such that it is convex towards a convex side of the bead section, wherein a plastic deformation of the total width of the arc section is less than the plastic deformation of the connecting section and wherein a bearing pressure distribution in the arc section in a compression state has a shape that is flat and wide in a width direction of the arc section. 2. Metal seal according to 1, wherein the bead section is formed on both sides of the main seal body and is in contact with the counterpart sealing surface formed in each of the sides of the main seal body to form the sealing section. 3. Metal seal according to 1 or 2, wherein the distance between the connecting sections formed on both sides of the arc section is in the range of 0.4 mm to 10 mm. 4. Metal seal according to 1, 2 or 3, wherein a radius of curvature of the arc section is in the range of 2 mm to 20 mm. 5. Metal gasket according to one of 1 to 4, wherein a length per side of the section with rising butt edge is in the range of one sixth to one third of a total width of the bead section. 6. Metal seal according to one of 1 to 5, wherein the main sealing body is coated with an elastic substance. IMPACT OF THE INVENTION

[0012] According to the invention, the metal seal can be provided which can form a wide bearing width for a counterpart sealing surface and which can achieve excellent sealing properties, even if blowholes are created in the counterpart sealing surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Fig. Figure 1 is a perspective exploded view of a housing to which a metal seal is attached according to a first embodiment of the invention.

[0014] Fig. 2 is a top view of an example of the metal seal according to the in Fig. 1 first embodiment according to the invention.

[0015] Fig. 3 is an enlarged cross-sectional view along a line (iii)-(iii) of Fig. 2.

[0016] Fig. 4A is a cross-sectional representation of the state of the in Fig. 2 shown metal gasket, which is arranged on a sealing surface and is not yet compressed, and Fig. 4B is a cross-sectional representation of the state of the in Fig. 2. Metal seal shown, which is arranged on the sealing surface and compressed.

[0017] Fig. 5A is a representation of a result of a FEM analysis of the plastic deformation of the in Fig. 2. Metal seal shown, which is not compressed, and Fig. 5B is a representation of a result of the FEM analysis of the plastic deformation of the in Fig. 2. Metal seal shown, which is compressed.

[0018] Fig. 6 is a representation of a result of the contact pressure distribution of the in Fig. 2. Metal seal shown, which is compressed.

[0019] Fig. Figure 7 is a cross-sectional view of a metal gasket (comparative example 1), whose bead section is formed into a uniform hill shape.

[0020] Fig. Figure 8 is a graph of the change in bearing width obtained when the metal seals are compressed.

[0021] Fig. Figure 9 is a cross-sectional view of a metal gasket (comparative example 2), whose bead section is formed into an angular hill shape.

[0022] Fig. Figure 10A is a representation of a result of an analysis of the plastic deformation of the metal seal (comparative example 2), whose bead section is formed into the angular hill shape and which is not yet compressed, and Fig. Figure 10B is a representation of a result of an analysis of the plastic deformation of the metal seal (comparative example 2), whose bead section is formed into the angular hill shape and which is compressed.

[0023] Fig. Figure 11 is a representation of the result of an analysis of the bearing pressure distribution of the metal gasket (comparative example 2), whose bead section is formed into the angular hill shape and which is not yet compressed.

[0024] Fig. Figure 12 is a perspective exploded view of a housing to which a metal seal is attached according to a second embodiment of the invention.

[0025] Fig. Figure 13 is a top view of an example of the metal seal according to the in Fig. 12 shown second embodiment according to the invention.

[0026] Fig. 14 is an enlarged cross-sectional view along a line (xiv)-(xiv) of Fig. 13.

[0027] Fig. 15A is a cross-sectional representation of the state of the in Fig. 13 metal gasket shown, which is arranged on a sealing surface and is not yet compressed, and Fig. 15B is a cross-sectional representation of the state of the in Fig. 13 shown metal gasket, which is arranged on the sealing surface and compressed.

[0028] Fig. Figure 16 is a representation of a result of a FEM analysis of the plastic deformation of the in Fig. 14. Metal seal shown, which is compressed. DESCRIPTION OF PREFERRED EXECUTION FORMS

[0029] With reference to the drawings, embodiments of the present invention are described. (First embodiment)

[0030] Fig. Figure 1 is a perspective exploded view of a housing to which a metal seal is attached according to the first embodiment of the invention. Fig. 2 is a top view of an example of the metal seal according to the in Fig. 1 first embodiment according to the invention. Fig. 3 is an enlarged cross-sectional view along a line (iii)-(iii) of Fig. 2. Fig. 4A is a cross-sectional representation of the state of the in Fig. 2 shown metal gasket, which is arranged on a sealing surface and is not yet compressed, and Fig. 4B is a cross-sectional representation of the state of the in Fig. 2. Metal seal shown, which is arranged on the sealing surface and compressed.

[0031] The in Fig. 1 case shown 100 comprises two elements, one of which is a lid element. 101 , comprising a casting made of aluminium or the like, and an enclosure element 102 , which includes a non-cast part. Regarding the lid element 101 and the enclosure element 102 are surfaces arranged around their openings, known as sealing surfaces. 101a and 102a specified, and between the sealing surfaces 101a and 102ais a metal seal 1 arranged, which is thereby sandwiched together. The lid element 101 and the enclosure element 102 are through bolts 103 held together, and the metal seal 1 This compresses them, creating a seal between the sealing surfaces. 101a and 102a opposite the fluid to be hermetically sealed.

[0032] As in Fig. 2 shown includes the metal seal 1 a sealing main body 2 , comprising a metal support made of, for example, stainless steel, a cold-rolled steel plate, a zinc-coated steel plate, an aluminum press plate or the like, a bead section 3 , which covers the entire circumference of the main sealing body 2 is arranged, and a corresponding number of bolt holes 4 , through the bolts 103 have been introduced.

[0033] The more detailed structure of the metal seal 1 is with reference to Fig. 3 further described. Fig. 3 shows the metal seal 1 , which is not yet compressed without a load applied to it.

[0034] The metal seal 1 indicates the bead section 3 up, which is between two flat sections 21 and 21 is formed by the main sealing body 2 are formed. The bead section 3 has a cross-sectional shape that corresponds to a shape with an arc section 31 , which is located on a side surface of the main sealing body 2 protrudes in a curve, and with sections with a rising buttress edge 32 , 32 , which are located at both butt edge sections of the arc section 31 each from the main sealing body 2 (the flat section) 21 ) towards the arc section 31It is formed by its sloping upward slope.

[0035] The arch section 31 and the section with rising impact edge 32 are evenly connected, while a connecting section 33 between the arch section 31 and the section with rising impact edge 32 towards the convex side of the bulge section 3 (in Fig. 3 upwards) is convexly formed. A section through the arc segment 31 and the section with rising impact edge 32 on the convex side of the bead section 3 The formed angle Θ is greater than 180°. The bead section 3 is designed in such a way that the inclination around the end of the sections with rising impact edge 32 and the beginning of the arc section 31 It becomes something gentle.

[0036] The section with rising impact edge 32is not limited to one that is formed with a straight, sloping side section in cross-sectional shape, and can be formed as a sloping side section with a curvature (an arc shape) that curves towards the convex side of the bead section 3 It is slightly convex. It can also be said that the bulge section 3 the arch section 31 , whose curvature is greater than that of the section with rising impact edge 32 is, and the sections with rising buttress edges 32 , whose curvature is smaller than that of the arc segment 31 includes or whose curvature is zero.

[0037] A reference mark “ 34 “ denotes a connecting section between the flat section 21 and the section with rising impact edge 32 .

[0038] As in Fig. The metal seal is shown in 4A. 1 between the sealing surfaces101a and 102a so that the curvature of the bead section 3 the sealing surface 101a of the lid element 101 , which is a cast part, facing the lid element. 101 and the enclosure element 102 are from the bolts 103 held, with the metal seal 1 The components are arranged in a sandwich-like manner between them, and the bolt axis forces thus act on the metal seal. 1 , so that the bead section 3 as in Fig. 4B is shown compressed. The arc section 31 This becomes the sealing surface 101a pressed to fit between the connecting sections 33 and 33 to be bent downwards, and forms along the sealing surface 101a a flat surface. The bead section 3 Therefore, it forms a cross-section of the entire arc. 31 , which is from the connecting sections 33 and33 for the sealing surface 101a enclosed in a sandwich-like manner, it has a wide base width.

[0039] The configuration with the bead section 3 , which forms the wide support width, is described in more detail.

[0040] Fig. Figure 5 shows a result of an FEM analysis of the plastic deformation in the state in which the metal seal according to the invention is 1 compressed. Fig. 5A shows the condition in which the metal seal 1 has not yet been compressed, and Fig. 5B shows the state in which the seal is 1 compressed.

[0041] Plastic deformation is indicated using colors with 21 values, whereas below, plastic deformation is represented by numerical values ​​with 21 values, using "1" as the lowest value and "21" as the highest value.

[0042] As from Fig. As can be seen in section 5A, the bead section 3 the metal seal 1 , which is not yet compressed, exhibits a plastic deformation that is higher than that of the arc section 31 in each of the connecting sections 33 and 33 between the arch section 31 and the sections with rising impact edge 32 and 32 and the connecting sections 34 and 34 between the flat sections 21 and 21 and the sections with rising impact edge 32 and 32 is the metal seal 1 exhibits a shape that determines the value of plastic deformation across the entire width of the arc section 31 exhibits a value lower than the value of plastic deformation in the connecting sections 33 and 34 is the value of the plastic deformation of each of the connecting sections. 33 and 34For example, it is “20”, and the value of the plastic deformation of the arc section 31 The value across its entire width is “5”. High plastic deformation in a section means that hardening is currently taking place in that section and indicates that a greater force is required to deform the section.

[0043] From the perspective of hardening through plastic deformation, the following can be observed in the metal seal: 1 the arc section 31 of the bulge section 3 compared to the connecting sections 33 , 33 , 34 and 34 can be easily deformed. The arc section 31 and the connecting sections 33 , 33 , 34 and 34 Therefore, all are deformed for the first time when the bead section 3 is compressed, while the deformation amounts of the arc section 31 and the connecting sections 33 ,33 , 34 and 34 are not uniform and a difference in the amount of deformation is created between them due to the difference in hardening.

[0044] The connecting sections 33 , 33 , 34 and 34 , whose consolidation continues, show, compared to that of the arch section 31 The smaller amount of deformation is always recorded. The amount of deformation in an X-direction (the width direction) is therefore recorded for the arc segment. 31 , which is from the connecting sections 33 and 33 The preceding connecting sections are sandwich-like enclosed, suppressed. The arc section 31 This transforms the arched shape before compression into the shape in Fig. The straight shape shown in 5B is uniformly deformed. The entire arc section 31This creates a flat surface, resulting in excellent contact width characteristics across the entire width.

[0045] As in Fig. 4 shown, according to the metal seal according to the invention 1 a recess during compression 101b through the arch section 31 be closed, which is therefore in contact across the wide contact area, even if the recess 101b through a blowhole in the sealing surface 101a of the lid section 101 , which encompasses the casting, is formed and is connected to the bead section in the bearing surface 3 is available.

[0046] A pressure distribution is created when the arch section is compressed. 31 is received, as described.

[0047] Fig. Figure 6 shows a result of an FEM analysis of the bearing pressure distribution obtained when the metal seal 1is compressed. The contact pressure distribution has a broad shape when the section on which the contact pressure is applied during compression is wider, and a flatter shape when the contact pressure is applied more evenly.

[0048] As from Fig. As can be seen in section 6, the bearing pressure distribution m1 of the arch section is 31 , which is obtained when the metal seal 1 compressed, it has a wide bearing surface that extends in the width direction of the arc section. 31 is formed. The arch section 31 the metal seal 1 exhibits a wide bearing pressure distribution when the metal seal 1 is compressed. The contact pressure distribution m1 points along the arc section. 31 in its width direction it has no projecting section and has for the arc section 31in its lateral direction, it has an essentially flat shape. The arc section 31 It forms a uniform pressure across the wide contact area.

[0049] Even if, as in Fig. 4 shown, the recess 101b through the blowhole in the sealing surface 101a of the lid section 101 , which encompasses the casting, is formed and the recess 101b in the bearing surface with the bead section 3 is present, according to the metal seal of the invention. 1 the pressure distribution of the arch section 31 , which occur when the metal seal is compressed 1 The bearing compression distribution of the arch section is obtained. 31 , which occur when the metal seal is compressed 1 The pressure distribution m1 is obtained with the flat and wide shape in the width direction, and by the pressure that is required for the total recess.101b If the seal is uniform, a stable closure can be achieved.

[0050] According to the metal seal 1 The fluid, which is to be hermetically sealed, does not escape through the recess. 101b Excellent sealing properties can be achieved by extending outwards and by exhibiting plastic deformation and pressure distribution.

[0051] In achieving the excellent sealing properties through plastic deformation and pressure distribution, it is important that the bead section 3 the arch section 31 between the sections with rising buttress edges 32 and 32 exhibits.

[0052] Fig. Figure 8 shows, for comparison, a graph of a change in the bearing width obtained when the metal seal according to the invention is compressed. 1 and a metal seal 300(Comparative example 1) with an ordinary full bead formed therein, which has the same bead shape (bead height and bead width) as that of the bead section 3 the metal seal 1 has a bulge section 301 exhibits a uniform hill shape, distinct from the flat section 21 is formed in a protruding shape, as in Fig. 7 is shown. The bead section 301 the metal seal 300 of the comparative example 1 exhibits a bead shape that does not include the section with rising butt edge 32 and the connecting section 33 the metal seal according to the invention 1 includes. Fig. 7 sections with the same reference symbols as in Fig. 3 sections of the same configurations as in Fig. 3 dar.

[0053] As from Fig. As can be seen in section 8, the bearing width of the metal seal according to the invention is 1 , which the arc section 31 includes, when the metal seal is compressed 1 compared to that of the metal seal 300 of the comparative example 1 enlarged. The bulge section 301 the metal seal 300 of the comparative example 1 can be compared to the bead section 3 the metal seal according to the invention 1 Do not ensure a wide bearing surface. (For metal gaskets) 300 It is therefore difficult to fill the recess caused by the blowhole using the bead section. 301 to close completely.

[0054] In Fig. 9 (comparative example 2) is a metal seal. 400 depicted, for example, a bulge section 401 , which is formed only by the section of the arc section 31 the metal seal 1, so that it juts out in an angular hill shape, using two straight sections 401a and 401b is trained Fig. Figure 10 shows a result of an analysis of the plastic deformation distribution and Fig. Figure 11 shows a result of an analysis of the contact pressure distribution. Fig. 10A shows the result for the seal. 400 , which is not compressed, and Fig. 10B shows the result for the seal. 400 , which is compressed. The metal seal 400 , which the bead section 401 with the in Fig. The invention, which has the angular hill shape shown in 9, is according to Japanese patent no. 5450575. Fig. 9 and Fig. 10 sections with the same reference symbols as in Fig. 3 sections of the same configuration as in Fig. 3 dar.

[0055] The result of the analysis of plastic deformation in Fig. 10 and the analysis of the contact pressure distribution of Fig. 11 can be based on the same criteria as those of the cases of Fig. 5 and Fig. 6 will be evaluated.

[0056] Based on the in Fig. The result shown in point 10 is achieved when forming the bead section. 401 The angular hill shape also partially increases the plastic deformation at a peak A of the hill shape. The value of the plastic deformation at peak A of the hill shape is also "20", which is a high value similar to those of the connecting sections. 33 and 34 is. As in Fig. As shown in Figure 11, it is evident that a bearing pressure distribution m2 therefore has a triangular shape with a narrow width, which locally projects at an acute angle at the peak A of the hill shape, and that the bearing pressure distribution m2 is not the bearing pressure distribution m1 with the flat and wide shape as in the metal seal according to the invention.1 can form.

[0057] At the bulge section 401 with the angular hill shape like the metal seal 400 of the comparative example 2 As described above, the bearing pressure distribution m2 with the triangular shape, which locally projects at an acute angle from the peak A of the hill shape, is obtained, and the bearing pressure at a point is extremely reduced as the point moves away from the peak A of the hill shape. Even if the recess caused by the blowhole in the counterpart sealing surface is removed from the bead section 401 If a deformed area can be covered, a seal cannot be achieved with the uniform pressure applied across the entire recess. This occurs when the pressure is exerted by the fluid to be hermetically sealed at the bead section. 401When the hermetically sealed fluid is applied, it can therefore easily pass over the peak A of the hill shape to escape to the outside through the recess.

[0058] When describing the distance between the connecting sections 33 and 33 with the high plastic deformation as “L1” ( Fig. 5) is at the bead section 3 of the present invention the bearing width property of the arc section 31 It is better if L1 is longer in the same bead shape (bead width and bead height).

[0059] The condition for sealing the recess caused by the blowhole 101b by closing the recess 101b using the arc section 31is “support width > diameter of blowhole × Fs”, and to establish this condition, L1 can be set at a suitable length corresponding to an assumed diameter of the blowhole, and is typically set at 0.4 mm or longer.

[0060] The “diameter of the blowhole” refers to the diameter of the maximum blowhole in the casting that is to be the mating element, and “Fs” refers to an adjustable parameter in connection with the sealing pressure, the sealing fluid and the roughness of the sealing surface.

[0061] However, since the diameter of the blowhole created in the casting is often 1.5 mm or more, the specific value of the distance between the connecting sections is 33 and 33 “L1” in the sense that the recess caused by the blowhole 101b can be effectively sealed, preferably 1.5 mm or more.

[0062] The width of the sealing surface on the width of the sealing products is, from the perspective of smaller design and weight reduction of the unit, at most approximately 10 mm. Therefore, the distance between the connecting sections can be 33 and 33 “L1” lies in the range of 0.4 mm to 10 mm. The distance between the connecting sections 33 and 33 However, taking into account the width of the sealing products and the width of the sealing surface, “L1” is approximately 8 mm or less.

[0063] Preferably, the specific radius of curvature of the arc segment is 31 of the bulge section 3 2 mm or more. It is difficult to determine the radius of curvature of the bead section. 3to be uniformly sized, as it influences the width and height of the bead; however, if the radius of curvature is less than 2 mm, the superiority of the bearing width property is impaired, and effective sealing of the cavity caused by a blowhole becomes difficult. Considering the products that utilize seals and the connection width property of the bead section. 3 Furthermore, the radius of curvature of the bead section is 20 mm or less.

[0064] Preferably, the length per side of the section with rising butt edge is 32 of the bulge section 3 (the length in the width direction along the slope) one sixth or more of the total width of the bead section 3 (the width of the bead section 3 (when viewed planarly). This is because any deformation of the section with an increasing impact edge 32against the deformation of the arc section 31 compression is prevented if the section with the rising impact edge is shorter, and a better contact width characteristic is achieved through the arc section. 31 can be achieved, and on the other hand, the section with rising impact edge should 32 shorter than one sixth of the total width of the bead section 3 As a result, the reaction properties of the seals increase, leading to a significant deterioration in compression properties.

[0065] If, on the other hand, the length per side of the section with rising butt edge 32 of the bulge section 3 longer than one third of the total width of the bead section 3 In such cases, the improved surface width characteristic cannot be easily achieved; therefore, the length is preferably one third or less of it. (Second embodiment)

[0066] The metal seal 1 According to the first embodiment, it is used in this case because the sealing surface 101a of the lid element 101 , which is one part of the casing 100 It is supposed to be a cast part and the sealing surface 102 of the enclosure element 102 , which is supposed to be the other part, is not a casting, while Fig. 12 to Fig. 15 show a metal seal according to the second embodiment, which is advantageously usable in the case where the counterpart sealing surfaces, which are on both sides of the main seal body 2 are arranged, both castings are.

[0067] Fig. Figure 12 is a perspective exploded view of a housing to which the metal seal is attached according to the second embodiment of the invention. Fig. Figure 13 is a top view of an example of the metal seal according to the in Fig. 12 shown second embodiment according to the invention. Fig. 14 is an enlarged cross-sectional view along a line (xiv)-(xiv) of Fig. 13. Fig. 15A is a cross-sectional representation of the state of the in Fig. 12. Metal gasket shown, which is arranged on sealing surfaces and is not yet compressed. Fig. 15B is a cross-sectional representation of the state of the in Fig. 13. The metal gasket shown is positioned and compressed on the sealing surfaces. Sections with the same reference numerals as in the Fig. 1 to Fig. 3 metal seals shown 1 represent sections of the same configurations as in the same configuration and are not described again, with the preceding description being used as their detailed description.

[0068] A in Fig. 12 cases shown 200 comprises two elements, one of which is a lid element. 201, comprising a casting made of aluminium or the like, and an enclosure element 202 , which also includes a cast part made of aluminum or the like. The housing 200 differs from the case 100 in the first embodiment in that both the lid element 201 as well as the enclosure element 202 These are cast parts.

[0069] Regarding the lid element 201 and the enclosure element 202 are surfaces that are arranged around their openings and face each other, called sealing surfaces. 201a and 202a specified, and between the sealing surfaces 201a and 202a is a metal seal 10 arranged, which is thereby sandwiched together. The lid element 201 and the enclosure element 202 are through bolts 203 held together. The metal seal 10This compresses the surface to create an interface between the sealing surfaces. 201a and 202a to seal against the fluid to be hermetically contained.

[0070] The metal seal 10 differs from the metal seal 1 according to the first embodiment, in that, as in Fig. 14 and Fig. 15 shown, bead sections 3A and 3B , which should each be convex, on both sides of the main sealing body 2 are formed. The bead section 3A is towards the sealing surface 201a of the lid element 201 , which is shown in the upper section of the drawing, is convex, and the bead section 3B is towards the sealing surface 202a of the enclosure element 202 , which is shown in the lower section of the drawing, is convex.

[0071] Analogous to the bead section 3the metal seal 1 are the bead sections 3A and 3B formed with cross-sectional shapes that define the arc sections 31A and 31B , sections with rising buttress edge 32A , 32B and 32C the butt joints of the arc sections 31A and 31B exhibit the two sections with rising buttress edges. 32A and 326 are the sections with rising butt edges that extend from the main sealing body 2 (the flat section) 21 ) towards the arc sections 31A and 31B rise diagonally upwards, and one section has a rising impact edge. 32C is the section with rising buttress edge, which connects the two arc sections 31A and 31B common to each other. The bead section 3A and the bead section 3B show a shape for the bead sections 3A and 3Bup, which passes through the one section with a rising impact edge 32 , which is positioned in between, are to be connected.

[0072] Connecting sections 33A and 33A between the arch section 31A and the sections with rising impact edge 32A and 32C are each directed towards the curvature of the bulge section 3A (in Fig. 14 upwards) analogous to the connecting section 33 the metal seal 1 convex shape. Connecting sections 33B and 33B between the arch section 31B and the sections with rising impact edge 32B and 32C are each directed towards the curvature of the bulge section 3B (in Fig. 14 downwards) analogous to the connecting section 33 the metal seal 1 convex shape.

[0073] As in Fig. 15A shows the metal seal. 10between the sealing surfaces 201a and 202a attached. One bead section 3A is arranged so that it points towards the sealing surface 201a the lid element is convex, and the other bead section 3B is arranged so that it points towards the sealing surface 202a of the enclosure element 202 is convex. The lid element 201 and the enclosure element 202 are through bolts 203 held together, thereby the metal seal 10 is sandwich-like enclosed, and the axial forces of the bolts thus act on the metal seal. 10 for the bead sections 3A and 3B , which are to be compressed, as in Fig. 15B is shown.

[0074] Analogous to the bead section 3 the metal seal 1 the bead sections 3A and 3B the metal seal 10a plastic deformation distribution that extends across the total widths of the arc sections 31A and 31B less than that of the connecting sections 33A , 33B and 34 is as in Fig. 16 is shown. If the metal seal 10 When compressed, the arch sections become 31A and 31B therefore to the sealing surfaces 201a and 202a pressed to fit between the connecting sections 33A and 33B to be bent in order to fit along the sealing surfaces 201a and 202a analogous to the arc section 31 the metal seal 1 to form flat sections. The beaded sections 3A and 3B They therefore form a wide support width for the overall widths of the arch sections. 31A and 31B , which are from the connecting sections 33A and 33B to be sandwiched together.

[0075] The arch sections 31A and 31B In their compressed state, they deform as described above, analogously to the arc section. 31 the metal seal 1 , in order to achieve excellent contact width characteristics in each case. Although not shown, it is easy to understand that the contact pressure distribution of each of the sheet sections 31A and 31B a pressure distribution is obtained that is flat and wide in the width direction, analogous to the pressure distribution m1 (see Fig. 6) of the arc section 31 the metal seal 1 The metal seal 10 This also forms the bearing pressure, which is uniform over a wide bearing surface, for the sealing surfaces. 201a and 202a , to which the arc sections 31A or 31B are equivalent to.

[0076] According to the metal seal 10 , as in Fig.As shown in Figure 15, even in the presence of the voids caused by the blowholes, the effect is effective. 20a and 202b in the sealing surfaces 201a and 202a , which are the castings, the arc sections 31A and 31B the bead sections 3A and 3B each analogous to the arc section 31 the metal seal 1 , in order to create a contact pressure that is suitable for the sealing surfaces 201a and 202a is uniform across the wide support surface. The recesses 201b and 202b They can therefore be securely closed and excellent sealing properties can be achieved.

[0077] The metal seal 10 shows the bead sections 3A and 3B on, which are located on both sides of the main sealing body 2 are formed, and each of the surfaces of the main sealing body 2It can therefore be used as the top or bottom side, depending on the seal. 10 between the sealing surfaces 201a and 202b is attached, and the alignment of the metal seal 10 It does not need to be chosen. The feasibility of installing it is therefore also excellent. (Other embodiments)

[0078] The metal seals 1 and 10 They can each be used as so-called rubber-coated metal seals, whose main sealing body 2 It is coated with an elastic substance. Since the rubber-coated metal seal encompasses the elastic substance on its surface, further excellent sealing properties can be achieved through the elastic deformation of the elastic substance, even if the mating sealing surface is rough.

[0079] For example, nitrile rubber, styrene-butadiene rubber, fluorinated rubber, acrylic rubber, and silicone rubber can each be used as an elastic substance. Each of these elastic substances can be used alone, or a synthetic rubber (including sponge rubber) comprising at least one of the aforementioned elastic substances can be used.

[0080] When the elastic substance is applied, a surface treatment layer is preferably used to achieve excellent adhesion properties of the elastic substance to the surface of the main sealing body. 2 arranged. Reference symbol list 1.10 Metal seal 2 main sealing bodies 21 flat section 3, 3A, 3B Bead section 31, 31A, 31B arc section 32, 32A, 32B, 32C Section with rising buttress edge 33, 33A, 33B Connection section 34 Connecting section 4 bolt holes 100, 200 cases 101a, 102a, 201a, 202a sealing surface 101b, 201b, 202b recess 300 metal gasket (comparative example 1) 301 Bead section 400 Metal seal (comparative example 2) 401a, 401b straight section 401 Bead section A summit of the hill shape m1, m2 Pressure distribution QUOTES INCLUDED IN THE DESCRIPTION

[0081] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0082] JP 10-318373

[0006] JP 2000-356267

[0006] JP 2003-322257 [0006, 0007] JP 2011-94667

[0007] JP 10-318373 A

[0008] JP 2000-356267 A

[0008] JP 2003-322257 A

[0008] JP 2011-94667 A

[0008] JP 5450575

[0054]

Claims

[1] Metal gasket comprising a bead section that comes into contact with a counterpart sealing surface in order to form a sealing section formed on a main gasket body, wherein the bead section comprises an arc section that is convex towards the counterpart sealing surface, and sections with rising butt edges that rise obliquely from the main sealing body towards the arc section, at both butt edges of the arc section, wherein a connecting section between the arc section and the section with rising butt edge is designed such that it is convex towards a convex side of the bead section, wherein a plastic deformation of the total width of the arc section is less than the plastic deformation of the connecting section and wherein a pressure distribution in the arc section in a state of compression has a shape that is flat and wide in a lateral direction of the arc section. [2] Metal seal according to claim 1, wherein the bead section is formed on both sides of the main seal body and is in contact with the counterpart sealing surface arranged in each of the sides of the main seal body to form the sealing section. [3] Metal seal according to claim 1 or 2, wherein the distance between the connecting sections formed on both sides of the arc section is in the range of 0.4 mm to 10 mm. [4] Metal seal according to claim 1, 2 or 3, wherein a radius of curvature of the arc section is in the range of 2 mm to 20 mm. [5] Metal gasket according to one of claims 1 to 4, wherein a length per side of the section with rising butt edge is in the range of one sixth to one third of a total width of the bead section. [6] Metal seal according to any one of claims 1 to 5, wherein the main sealing body is coated with an elastic substance.

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