Gasket

Abstract

While reducing the reaction force in the installed state, the sealing performance is suppressed from being reduced by corrosive foreign matter such as salt water and snow melting agent. The sealing gasket (1) includes a metal substrate (10) made of metal and a covering layer (20) formed of an elastomer and covering at least a portion of the metal substrate (10). The metal substrate (10) has a pair of upper surfaces (11) and lower surfaces (12) facing each other, and has a flange portion (13) as a portion protruding toward the side facing the upper surface (11), an inner peripheral portion (14) as a portion extending from the inner peripheral edge (13b) of the flange portion (13), and an outer peripheral portion (15) extending from the outer peripheral edge (13a) of the flange portion (13). The outer peripheral portion (15) extends obliquely toward the side facing the lower surface (12) relative to the direction in which the flange portion (15) protrudes.

Description

Technical Field

[0001] The present invention relates to a gasket, and more particularly to a gasket used in vehicles, general machinery, and the like. Background Art

[0002] In vehicles and general machinery, such as automobiles, in devices that house engines and electronic components, gaskets are used to seal the frame. For example, the gasket is compressed and sandwiched between a pair of components that form the frame, where it undergoes elastic-plastic deformation, thereby sealing the pair of components and thus achieving airtightness of the frame. Cars sometimes travel in coastal areas or areas where deicing agents are spread. In these cases, salt water and deicing agents adhere to the car parts, and the salt water and deicing agents enter and remain in the gaps between the components that clamp the gasket. The retained salt water or deicing agents sometimes cause corrosion on the components that clamp the gasket. When the components that clamp the gasket are made of aluminum alloy, aluminum has a high ionization tendency, so the components that clamp the gasket are easily corroded by the retained salt water or deicing agents. When the corroded portion crosses the sealing line of the gasket, the sealing function of the gasket is reduced or disappears. Therefore, for components using gaskets, a salt spray test is performed in advance to evaluate the corrosion resistance. In the salt spray test, salt water is accumulated in the gap between the components that sandwich the gasket in the component to which the gasket is attached. The component is then alternately switched between dry and wet states to evaluate its corrosion resistance to salt water.

[0003] In this way, in order to suppress the reduction of sealing performance of the gasket caused by corrosive foreign matter such as salt water and snow melting agent, it is preferred that the parts of the clamped gasket are not corroded by corrosive foreign matter. In the past, a gasket structure for suppressing the corrosion of the parts of the clamped gasket by corrosive foreign matter has been proposed.

[0004] For example, in Patent Document 1, Figure 9 As shown, a gasket structure 100 is disclosed in which two metal gaskets 101 are sandwiched between a pair of components 120 and 121 facing each other. The metal gasket 101 comprises: a metal substrate 102, which, in a free state without being sandwiched, is formed by an inner peripheral portion 103 and an outer peripheral portion 104 extending parallel to each other, and a flange (bead) portion 105 extending obliquely between the inner peripheral portion 103 and the outer peripheral portion 104; and a rubber layer 106 covering the upper and lower surfaces of the metal substrate 102. In the gasket structure 100, as shown in FIG. Figure 9As shown, the outer peripheral portion 104 of the upper metal sealing gasket 101 contacts the upper component 120 via the rubber layer 106, and the outer peripheral portion 104 of the lower metal sealing gasket 101 contacts the lower component 121 via the rubber layer 106, thereby reducing the space between the pair of components 120 and 121 where corrosive foreign matter such as salt water is retained, thereby seeking to inhibit the corrosion of the components 120 and 121 by the corrosive foreign matter.

[0005] In addition, in Patent Document 2, as Figure 10 As shown, a sealing gasket 110 is disclosed, which includes a metal substrate 111 and a rubber layer 116 covering the upper and lower surfaces of the metal substrate 111. In the sealing gasket 110, the metal substrate 111 has: an inner peripheral portion 112 and an outer peripheral portion 113 extending parallel to each other in a free state; a flange portion 114 in a full flange shape extending between the inner peripheral portion 112 and the outer peripheral portion 113 and protruding upward; and a bent portion 115 formed by bending the outer peripheral side end portion of the outer peripheral portion 113 downward. In the installed state, as shown in FIG. Figure 11 As shown, the gasket 110 is sandwiched between a pair of components 120 and 121. The outer peripheral end of the outer peripheral portion 113 and the flange portion 114 contact the upper component 120 via the rubber layer 116, while the inner peripheral end of the outer peripheral portion 113, the outer peripheral end of the inner peripheral portion 112, and the outer peripheral end of the bent portion 115 contact the lower component 121 via the rubber layer 116. In this way, the gasket 110 reduces the space between the pair of components 120 and 121 where corrosive foreign matter such as salt water can accumulate, thereby suppressing corrosion of the components 120 and 121.

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: Japanese Patent Application Laid-Open No. 2013-36607

[0009] Patent Document 2: Japanese Patent Application Laid-Open No. 2013-61002 Summary of the Invention

[0010] Problems to be solved by the invention

[0011] The above-mentioned existing gasket structure 100 and gasket 110 can suppress corrosion of the components 120 and 121 that clamp them. However, when the gasket structure 100 is installed, the pair of metal gaskets 101 are opposed to each other and are clamped. Therefore, the reaction force of the clamped pair of metal gaskets 101 is large, and a large tightening force is required to fasten the components 120 and 121. In addition, when the gasket 110 is installed, the flange portion 114 and the bent portion 115 of the full flange shape are compressed and clamped. Therefore, the reaction force of the clamped gasket 110 is large, and a large tightening force is required to fasten the components 120 and 121. In this way, although there is a structure in the past that can reduce corrosion of the installed components, a large tightening force is required to fasten the components.

[0012] Therefore, existing gaskets require a structure that can reduce the reaction force in the installed state while suppressing the reduction in sealing performance caused by corrosive foreign matter such as salt water and deicing agents. In addition, existing gaskets require a structure that can further reduce the gap between the parts that clamp the gasket to reduce the retention of corrosive foreign matter.

[0013] The present invention has been made in view of the above-mentioned problems, and an object thereof is to provide a gasket that can reduce the reaction force in the installed state and prevent the reduction of sealing performance caused by corrosive foreign matter such as salt water and deicing agent.

[0014] Means used to solve problems

[0015] In order to achieve the above-mentioned purpose, the sealing gasket involved in the present invention includes a metal substrate made of metal and a covering layer formed by an elastomer covering at least a portion of the metal substrate, and the sealing gasket is characterized in that the metal substrate has a pair of surfaces facing back to each other, and has a flange portion as a portion protruding toward the side facing one surface of the pair of surfaces, an inner peripheral portion as a portion extending from the edge of the inner peripheral side of the flange portion, and an outer peripheral portion extending from the edge of the outer peripheral side of the flange portion, and the outer peripheral portion extends obliquely toward the side facing the other surface of the pair of surfaces relative to the direction in which the flange portion protrudes.

[0016] In the gasket according to one aspect of the present invention, the outer peripheral portion extends along a plane.

[0017] In the gasket according to one aspect of the present invention, the outer peripheral portion extends along a curved surface that protrudes toward the side facing the other surface and has a smaller curvature than that of the flange portion.

[0018] In the gasket according to one aspect of the present invention, the inner peripheral portion extends obliquely toward a side facing the other of the pair of surfaces relative to a direction in which the flange portion protrudes.

[0019] In the gasket according to one aspect of the present invention, at least a portion of the inner peripheral portion is formed symmetrically with respect to the flange portion and at least a portion of the outer peripheral portion.

[0020] Effects of the Invention

[0021] According to the gasket of the present invention, it is possible to reduce the reaction force in the installed state and suppress the reduction in sealing performance caused by corrosive foreign matter such as salt water and deicing agent. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a plan view showing a schematic structure of a gasket according to the first embodiment of the present invention.

[0023] Figure 2 It is along Figure 1 A cross-sectional view of the sealing gasket is shown along line AA.

[0024] Figure 3 It will Figure 2 The outer periphery of the gasket is shown in an enlarged partial cross-sectional view.

[0025] Figure 4 It will Figure 2 The inner periphery of the gasket is shown in an enlarged partial cross-sectional view.

[0026] Figure 5 It means during the installation process Figure 1 A cross-sectional view of the gasket shown.

[0027] Figure 6 Indicates the installation status Figure 1 A cross-sectional view of the gasket shown.

[0028] Figure 7 It is a cross-sectional view taken along line AA showing a modified example of the gasket according to the first embodiment of the present invention.

[0029] Figure 8 It is a cross-sectional view taken along line AA showing another modified example of the gasket according to the first embodiment of the present invention.

[0030] Figure 9 This is a partial cross-sectional view showing a schematic structure of a conventional gasket.

[0031] Figure 10 This is a partial cross-sectional view schematically showing the structure of another conventional gasket.

[0032] Figure 11 It is a partial cross-sectional view of another conventional gasket in an installed state. DETAILED DESCRIPTION

[0033] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0034] Figure 1 1 is a plan view showing a schematic structure of a gasket 1 according to a first embodiment of the present invention. Figure 2 Yes Figure 1 The cross-sectional view of the cross section of the gasket 1 shown represents a cross section along the line AA perpendicular to the extension direction of the gasket 1 (hereinafter also referred to as the cross section). The gasket 1 is used in vehicles, general industrial machinery, etc., and is clamped between two parts to undergo elastic-plastic deformation and is used to seal between the two parts. For example, in the engine room of a car, the gasket 1 is clamped between two parts forming a frame that accommodates electronic components, etc., to seal the frame and isolate the electronic components, etc. from corrosive foreign matter such as salt water and snow melting agents. Figure 1 、 2 , the gasket 1 is shown in a free state without being clamped between components.

[0035] like Figure 1 、 2 As shown, the gasket 1 is a gasket comprising a metal substrate 10 and a covering layer 20 formed of an elastomer that covers at least a portion of the metal substrate 10. The metal substrate 10 has a pair of surfaces 11 and 12 facing away from each other, and further comprises a flange portion 13 that protrudes toward the side facing one of the pair of surfaces (surface 11), an inner peripheral portion 14 that extends from the inner peripheral edge of the flange portion 13, and an outer peripheral portion 15 that extends from the outer peripheral edge of the flange portion 13. The outer peripheral portion 15 extends obliquely toward the side facing the other of the pair of surfaces (surface 12) relative to the direction in which the flange portion 13 protrudes. The gasket 1 will be described in detail below.

[0036] In addition, if Figure 2 As shown, the inner peripheral side refers to the closed space side (inner side) surrounded by the annular sealing gasket 1. Figure 2 As shown in FIG, the outer peripheral side refers to the space side not closed by the annular gasket 1, which is the outer side opposite to the inner side. Figure 2 In the figure, the upper side is referred to as the upper side, and the lower side is referred to as the lower side. The upper side and the lower side are used for convenience of description and do not particularly limit the installation posture of the gasket 1.

[0037] like Figure 1As shown, the gasket 1 is a flat plate-shaped member extending in an annular shape. More specifically, it is formed into a rectangular annular shape when viewed from above. The shape of the gasket 1 when viewed from above is not limited to a rectangle; other shapes are also possible. Furthermore, the gasket 1 has through-holes, or bolt holes 30, formed therein for inserting bolts. These bolts are used to fasten the two components to be attached, thereby sandwiching the gasket 1 between the components.

[0038] Specifically, the metal substrate 10 is a plate-shaped component formed of a metal material having the same or substantially the same thickness and having elasticity. The metal substrate 10 constitutes the sealing gasket 1, and in the present embodiment, is formed into a rectangular ring extension when viewed from above. The metal substrate 10 can be formed by a single elastic metal plate, or can be formed by stacking and overlapping a plurality of elastic metal plates. As the metal material of the metal substrate 10, stainless steel, cold-rolled steel, galvanized steel, aluminum alloy, etc. can be used. The flange portion 13, the inner peripheral portion 14, and the outer peripheral portion 15 are formed by stamping and forging the metal plate, and are formed integrally with each other from the same metal material.

[0039] In addition, the metal substrate 10 has an upper surface 11 and a lower surface 12 as a pair of surfaces. Figure 2 As shown, the upper surface 11 and the lower surface 12 face away from each other in the thickness direction of the metal substrate 10, with the upper surface 11 facing upward and the lower surface 12 facing downward. In addition, in a cross section, the contours described by the upper surface 11 and the lower surface 12 are symmetrical or substantially symmetrical with respect to a center line connecting the centers of the metal substrate 10 in the thickness direction.

[0040] The flange portion 13 is a portion of the metal substrate 10 that protrudes upwardly from the upper surface 11 and forms a flange in the gasket 1. Specifically, Figure 2 As shown, flange portion 13 protrudes upward along a protrusion direction line x, which extends along the protrusion direction of flange portion 13. Upper surface 11 forms an upwardly convex curved surface, while lower surface 12 forms an upwardly concave surface. In cross section, flange portion 13 extends, for example, along an arc of uniform curvature. However, flange portion 13 may not extend along an arc of uniform curvature in cross section.

[0041] like Figure 2 As shown, in cross section, the flange portion 13 is symmetrical or substantially symmetrical about the protrusion direction line x. In cross section, the flange portion 13 may not be symmetrical about the protrusion direction line x. If the flange portion 13 is not symmetrical about the protrusion direction line x in cross section, the protrusion direction line x may be a line (normal) perpendicular to the top 13c of the flange portion 13. Furthermore, the top 13c of the flange portion 13 is the uppermost portion of the flange portion 13 in the protrusion direction of the flange portion 13, or a portion adjacent to the uppermost portion.

[0042] like Figure 1 、 2 As shown, the peripheral portion 15 extends from the edge of the outer peripheral side of the flange portion 13 (the outer peripheral edge 13a) toward the outer peripheral side by a predetermined width. As described above, the peripheral portion 15 extends obliquely downward relative to the protruding direction of the flange portion 13 (the protruding direction line x). That is, the peripheral portion 15 becomes a tapered portion. Specifically, as Figure 2 As shown, the peripheral portion 15 extends along the plane. For example, in the cross section, the peripheral portion 15 extends linearly from the outer peripheral edge 13a of the flange portion 13. In addition, in the cross section, the peripheral portion 15 extends obliquely downward relative to the protruding direction line x. More specifically, as shown in FIG. Figure 3 As shown, the extension direction line l1 connecting the centers of the thickness direction of the outer peripheral portion 15 in the cross section is a straight line, and the angle α between the extension direction line l1 and the lower side of the protrusion direction line x is less than 90°.

[0043] The outer peripheral portion 15 may not extend in a straight line as described above. Specifically, the extension direction line l1 extending along the extension direction of the outer peripheral portion 15 may not be a straight line but a substantially straight line. In this case, as described above, the outer peripheral portion 15 extends obliquely downward relative to the protruding direction of the flange portion 13 (protruding direction line x). That is, as Figure 3 As shown, in the cross section, the included angle α between the extension direction line l1 of the peripheral portion 15 and the lower side of the protrusion direction line x is less than 90°.

[0044] The inner circumference 14 and the outer circumference 15 are formed into a tapered portion in the same manner as Figure 1 、 2 As shown, it extends from the inner peripheral edge (inner peripheral edge 13b) of the flange portion 13 toward the inner peripheral side by a predetermined width, and furthermore, extends obliquely downward relative to the protruding direction (protruding direction line x) of the flange portion 13. Specifically, as shown Figure 2 As shown, the inner peripheral portion 14 extends along the plane. For example, in the cross section, the inner peripheral portion 14 extends linearly from the inner peripheral edge 13b of the flange portion 13. In addition, in the cross section, the inner peripheral portion 14 extends obliquely downward relative to the protruding direction line x. More specifically, as shown in FIG. Figure 4 As shown, the extension direction line l2 connecting the centers of the inner peripheral portion 14 in the thickness direction in the cross section is a straight line, and the angle β between the extension direction line l2 and the lower side of the protrusion direction line x is less than 90°.

[0045] The inner peripheral portion 14 may not extend in a straight line as described above. Specifically, the extension direction line l2 extending along the extension direction of the inner peripheral portion 14 may not be a straight line but a substantially straight line. In this case, as described above, the outer peripheral portion 15 extends obliquely downward relative to the protruding direction of the flange portion 13 (protruding direction line x). That is, as Figure 4As shown, in the cross section, the included angle β between the extension direction line l2 of the inner peripheral portion 14 and the lower side of the protrusion direction line x is less than 90°.

[0046] In the gasket 1, at least a portion of the inner peripheral portion 14 is formed symmetrically with respect to the flange portion 13 and at least a portion of the outer peripheral portion 15. Specifically, the length of the inner peripheral portion 14 in the extending direction (the extending direction line 12 direction) is longer than the length of the outer peripheral portion 15 in the extending direction (the extending direction line 11 direction), as shown in FIG. Figure 2 As shown, in cross section, a portion of the inner peripheral portion 14 on the flange portion 13 side is symmetrical with respect to the entire outer peripheral portion 15 about the protrusion direction line x. Furthermore, the outer peripheral portion 15 and the inner peripheral portion 14 are similarly inclined relative to the protrusion direction line x, and the angle α between the extension direction line l1 of the outer peripheral portion 15 and the protrusion direction line x is the same as the angle β between the extension direction line l2 of the inner peripheral portion 14 and the protrusion direction line x.

[0047] The length of the inner peripheral portion 14 in the extension direction and the length of the outer peripheral portion 15 in the extension direction may also be the same. In this case, in cross-section, the entire inner peripheral portion 14 and the entire outer peripheral portion 15 are symmetrical about the protrusion direction line x. Furthermore, the length of the outer peripheral portion 15 in the extension direction may be longer than the length of the inner peripheral portion 14 in the extension direction, and in cross-section, the portion of the outer peripheral portion 15 on the flange portion 13 side is symmetrical with the entire inner peripheral portion 14 about the protrusion direction line x. Furthermore, the outer peripheral portion 15 and the inner peripheral portion 14 may not be inclined relative to the protrusion direction line x, and the angle α between the extension direction line l1 of the outer peripheral portion 15 and the protrusion direction line x may not be the same as the angle β between the extension direction line l2 of the inner peripheral portion 14 and the protrusion direction line x. For example, the angle α between the extension direction line l1 of the outer peripheral portion 15 and the protrusion direction line x may be greater or smaller than the angle β between the extension direction line l2 of the inner peripheral portion 14 and the protrusion direction line x.

[0048] As described above, the cover layer 20 is an elastic body that covers at least a portion of the metal substrate 10. In this embodiment, Figure 2 As shown, the covering layer 20 covers the entire upper surface 11 and the entire lower surface 12 of the metal substrate 10. Specifically, the covering layer 20 integrally covers the flange portion 13, the inner peripheral portion 14, and the outer peripheral portion 15 from both the upper and lower sides. The covering layer 20 does not cover the inner peripheral edge (inner peripheral edge 14a) of the inner peripheral portion 14 or the outer peripheral edge (outer peripheral edge 15a) of the outer peripheral portion 15. Alternatively, the covering layer 20 may cover a portion or all of the inner peripheral edge 14a of the inner peripheral portion 14, or a portion or all of the outer peripheral edge 15a of the outer peripheral portion 15.

[0049] As the elastic body forming the cover layer 20, there is an elastic body made of synthetic rubber. As the synthetic rubber, there is, for example, a synthetic rubber containing at least one of nitrile rubber (NBR), styrene butadiene rubber (SBR), fluororubber (FKM), acrylic rubber (ACM) and silicone rubber. Figure 2 As shown, the cover layer 20 has a uniform or substantially uniform thickness in its cross section and is formed into a film or sheet shape and attached to the metal substrate 10. Alternatively, the elastic body of the cover layer 20 may be foam rubber.

[0050] The cover layer 20 is attached to the metal substrate 10 via an adhesive, for example. A surface treatment layer formed by surface treatment of the metal substrate 10 may be formed between the metal substrate 10 and the adhesive layer. Examples of the surface treatment include zinc phosphate treatment.

[0051] In the sealing gasket 1, as Figure 1 As shown, the width of the periphery of the portion where the bolt hole 30 is formed is wider than that of the other portions. The bolt hole 30 is formed on the portion of the metal substrate 10 extending from the outer peripheral edge 15a of the outer peripheral portion 15 toward the outer peripheral side, that is, the bolt hole piece 16. Figure 1 As shown, the bolt hole piece 16 is expanded to a size that allows the bolt hole 30 to be formed. The gasket 1 is formed so that the shape of the cross section perpendicular to the extending direction of the gasket 1 is the same or substantially the same in the extending direction of the gasket 1, except for the portion where the bolt hole piece 16 is formed. Alternatively, the gasket 1 may have a portion where the shape of the cross section perpendicular to the extending direction of the gasket 1 is different in the extending direction of the gasket 1, in the portion where the bolt hole piece 16 is not formed.

[0052] Next, the function of the gasket 1 will be described. Figure 5 1 is a cross-sectional view showing the gasket 1 during installation to an installation object. Figure 6 The figure is a cross-sectional view showing the appearance of the gasket 1 in the installed state installed on the installation object. In the installed state, the gasket 1 is clamped between two components 70 and 71 of the installation object, and is compressed between the components 70 and 71 to undergo elastic-plastic deformation to seal between the components 70 and 71. Specifically, in a state in which the plane 70a formed on the component 70 and the plane 71a formed on the component 71 are opposed to each other, the components 70 and 71 are fastened together, and the gasket 1 is compressed between the plane 70a and the plane 71a to undergo elastic-plastic deformation. The components 70 and 71 are, for example, components that form the cylinder block and cylinder head of the engine, the cylinder block and oil pan, the housing of the fuel cell stack, or the frame of other devices, and the planes 70a and 71a are, for example, formed on flanges formed on the components 70 and 71.

[0053] During the installation process in which the components 70, 71 are fastened, the gasket 1 is Figure 2In the free state shown, the components 70 and 71 are elastically and plastically deformed until a desired contact pressure is generated at the contact portion (seal line) with the components 70 and 71. The tightening is performed by screwing a bolt, for example.

[0054] During the installation process, the components 70 and 71 are fastened, and the flange portion 13 is in contact (surface contact) with the flat surface 70a of the upper component 70 via the cover layer 20 and is pulled downward ( Figure 5 In addition, the outer peripheral edge 15a of the lower surface 12 of the outer peripheral portion 15 and its vicinity (hereinafter referred to as the outer peripheral end 15b) contacts the flat surface 71a of the lower component 71 through the cover layer 20 and is pulled upward ( Figure 5 In addition, the inner peripheral edge 14a of the lower surface 12 of the inner peripheral portion 14 and its vicinity (hereinafter referred to as the inner peripheral end portion 14b) contacts the flat surface 71a of the component 71 through the cover layer 20 and is pulled upward ( Figure 5 Press in the direction of the arrow z2). Figure 5 As shown, the metal substrate 10 undergoes elastic-plastic deformation, the flange portion 13 extends toward the outer and inner circumferences, and the inclination of the inner and outer circumferences 14 and 15 relative to the flange portion 13 (relative to the protrusion direction line x) increases, that is, the angles α and β increase, and the height of the metal substrate 10 decreases. Note that the height of the metal substrate 10 refers to the height of the metal substrate 10 in the direction of the protrusion direction line x.

[0055] During the tightening process, if the tightening force of the components 70 and 71, that is, the axial force of the bolts, reaches a predetermined set value, the gasket 1 is in a state where a desired reaction force is generated, the tightening of the components 70 and 71 is completed, and the gasket 1 is in an installed state. Figure 6 As shown, the top 13c of the flange 13 and the upper covering layer 20 in the vicinity thereof are in contact with the plane 70a, and the outer periphery 13a of the flange 13 and the lower covering layer 20 in the vicinity thereof and the inner periphery 13b of the flange 13 and the lower covering layer 20 in the vicinity thereof are in contact with the plane 71a (fully compressed state). Figure 6 As shown, three sealing lines s1, s2, and s3 are formed by the flange portion 13. The sealing line s1 is a sealing line formed by the contact between the top 13c of the flange portion 13 and the upper side covering layer 20 in the vicinity thereof and the plane 70a. The sealing line s2 is a sealing line formed by the contact between the outer peripheral edge 13a of the flange portion 13 and the lower side covering layer 20 in the vicinity thereof and the plane 71a. The sealing line s3 is a sealing line formed by the contact between the inner peripheral edge 13b of the flange portion 13 and the lower side covering layer 20 in the vicinity thereof and the plane 71a.

[0056] Thus, the sealing gasket 1 seals between the plane 70a and the plane 71a in the installed state, preventing objects such as lubricating oil inside the components 70 and 71 from leaking from the inner peripheral side through the gap between the planes 70a and 71a, and preventing rainwater, dust, etc. from invading from the outer peripheral side through the gap between the planes 70a and 71a.

[0057] Furthermore, in the fully compressed state, if Figure 6 As shown, the covering layer 20 above the outer peripheral end 15b of the outer peripheral portion 15 contacts the plane 70a without forming a gap. Furthermore, the covering layer 20 below the outer peripheral end 15b of the outer peripheral portion 15 contacts the plane 71a with almost no gap. This is because, in the free state of the gasket 1, the outer peripheral portion 15 connected to the flange portion 13 tilts downward relative to the protruding direction line x of the flange portion 13, forming a tapered portion. Therefore, even in the fully compressed installed state, the outer peripheral portion 15 does not tilt upward relative to the protruding direction line x to the extent that the outer peripheral end 15b, particularly the covering layer 20 below the outer peripheral edge 15a, floats from the plane 71a. This prevents the gasket 1 from jumping up, which could cause the outer peripheral end 15b, particularly the covering layer 20 below the outer peripheral edge 15a, to float from the plane 71a.

[0058] More specifically, in the free state, the outer peripheral portion 15 is inclined downward relative to the protruding direction line x. Therefore, even if the flange portion 13 is compressed and reduced in height during the fastening process of the components 70 and 71, as shown in FIG. Figure 5 As shown, the outer peripheral portion 15 can also maintain a downwardly tilted state. Therefore, during the tightening process of the components 70 and 71, the covering layer 20 on the lower side of the outer peripheral end 15b of the outer peripheral portion 15 can continuously maintain contact with the flat surface 71a. In addition, in the fully compressed installation state, the outer peripheral portion 15 also maintains a downwardly tilted state, or the outer peripheral portion 15 is in a state perpendicular to the protrusion direction line x, or the outer peripheral portion 15 is in a state upwardly tilted relative to the protrusion direction line x to the extent that the covering layer 20 on the lower side of the outer peripheral end 15b, especially the outer peripheral edge 15a, does not float from the flat surface 71a. The covering layer 20 on the lower side of the outer peripheral end 15b of the outer peripheral portion 15 continuously maintains contact with the flat surface 71a. This prevents the outer peripheral end 15b, particularly the covering layer 20 below the outer peripheral edge 15a, from jumping off the plane 71a. No gap is formed between the outer peripheral end (outer peripheral end 15b) of the gasket 1 and the planes 70a and 71a. Furthermore, when fully compressed and installed, no gap is formed between the outer peripheral end (outer peripheral end 15b) of the gasket 1 and the upper plane 70a. Therefore, the gasket 1 is able to prevent the formation of a space on the outer peripheral side between the components 70 and 71, preventing corrosive foreign matter such as salt water and deicing agents from entering the outer peripheral sides of the sealing lines s1 and s2.

[0059] Furthermore, depending on the length of the outer portion 15 in the extension direction, the angle of inclination (angle α) of the outer portion 15, the shape of the flange 13, and other factors, the outer portion 15 may not be maintained in a downwardly inclined position when fully compressed, or may not be perpendicular to the protrusion direction line x, but may instead be tilted upward. However, as described above, since the outer portion 15 forms a tapered portion that tilts downward in the free state, this suppresses the outer portion 15 from jumping during compression, similar to the above-described situation. Even when the outer portion 15 tilts upward in the fully compressed state, it can be maintained without significantly tilting upward relative to the protrusion direction line x. Therefore, even if a gap forms between the outer peripheral end of the gasket 1 and the flat surface 71a, it is extremely small, preventing corrosive foreign matter from entering the gap. Even if corrosive foreign matter does enter the gap, the amount of foreign matter that remains is minimal. On the other hand, in this case, even when fully compressed and installed, no gap is formed between the outer peripheral end (outer peripheral end 15b) of the gasket 1 and the upper flat surface 70a. Therefore, it is possible to prevent corrosive foreign matter from entering the outer peripheral sides of the sealing lines s1 and s2. Furthermore, it is possible to prevent corrosive foreign matter from being retained on the outer peripheral sides of the sealing lines s1 and s2, or, even if corrosive foreign matter is retained on the outer peripheral sides of the sealing lines s1 and s2, the amount of retained foreign matter can be minimized.

[0060] In this way, the gasket 1 can reduce the space connected to the outside formed on the outer side between the components 70 and 71 through the peripheral portion 15, or can eliminate such a space connected to the outside. Therefore, according to the gasket 1, the peripheral portion 15 can prevent corrosive foreign matter from corroding the flat surfaces 70a and 70b of the components 70 and 71 to be installed on the outer side of the sealing lines s1 and s2, and can prevent the sealing lines s1 to s3 from being disconnected due to corrosion. In this way, it is possible to prevent the reduction of sealing performance caused by corrosive foreign matter such as salt water and de-icing agents. In particular, the gasket 1 is suitable when the components 70 and 71 are made of aluminum alloys such as ADC12, which are easily corroded by salt water and the like.

[0061] Furthermore, in the free state, because outer peripheral portion 15 is tilted downward relative to protrusion direction line x, the height of gasket 1 is the sum of the height of flange portion 13 and the height resulting from the tilt of outer peripheral portion 15. Consequently, the height of flange portion 13 of gasket 1 is lower than that of conventional gaskets of the same height. This reduces the reaction force generated by flange portion 13 in the fully compressed state of the gasket, thereby reducing the tightening force required to fully compress components 70 and 71.

[0062] In addition, the inner peripheral portion 14 is also inclined downward relative to the protrusion direction line x, similarly to the outer peripheral portion 15. Therefore, the inner peripheral portion 14 functions in the same manner as the outer peripheral portion 15 described above during and after installation, and achieves the same effect as the outer peripheral portion 15. As a result, the inner peripheral side of the sealing lines s1 and s3 can seal between the flat surfaces 70a and 71a, and the sealing performance can also be improved for the sealed object on the inner peripheral side.

[0063] Furthermore, even if corrosive foreign matter passes through the outer peripheral seal line s2 and enters the interior, the inner seal line s3 prevents further entry of the foreign matter, thereby suppressing the expansion of corrosion caused by salt water, etc., on the component 71. Similarly, even if liquid, etc. passes through the seal line s3 of the inner peripheral portion 14 and leaks to the outside, the seal line s2 prevents the leaked liquid from leaking further.

[0064] As described above, the gasket 1 according to the embodiment of the present invention can reduce the reaction force of the gasket 1 in the installed state and suppress the reduction in sealing performance caused by corrosive foreign matter such as salt water and deicing agents.

[0065] As described above, the posture of the outer peripheral portion 15 in the installed state varies depending on the length of the outer peripheral portion 15 in the free state, the inclination angle (angle α) of the outer peripheral portion 15, the shape of the flange portion 13, and other factors. Therefore, it is preferable to set the length of the outer peripheral portion 15 in the free state, the inclination angle of the outer peripheral portion 15, the shape of the flange portion 13, and other factors so that the outer peripheral portion 15 is tilted downward in the installed state, or is perpendicular to the protrusion direction line x, or is tilted upward relative to the protrusion direction line x to such an extent that the outer peripheral end portion 15b, particularly the cover layer 20 below the outer peripheral edge 15a, does not float from the plane 71a. The same applies to the inner peripheral portion 14.

[0066] Next, a modification of the gasket 1 according to the above-described embodiment of the present invention will be described. Figure 7 1 is a cross-sectional view taken along line AA showing a modified example of the gasket 1. Figure 7 As shown in FIG. 1 , the outer peripheral portion 15 may not extend along a plane, but may extend along a curved surface that is bent in a downwardly protruding manner. Specifically, the outer peripheral portion 15 may extend along a curved surface that is protruding downward and has a curvature smaller than that of the flange portion 13 in the cross section. Figure 7 As shown in FIG. 1 , the extension direction line l1 of the outer peripheral portion 15 may also be a curve that is convex downward. However, regarding the curvature of the outer peripheral portion 15, for example, the curvature of the extension direction line l1 is set as described above so as not to cause the gasket 1 to jump up. Figure 7As shown in FIG. 1 , the inner peripheral portion 14 may extend along a curved surface that is curved so as to protrude downward, similarly to the outer peripheral portion 15 in this modification. In this case, the gasket 1 also exhibits the above-mentioned effects.

[0067] In addition, the outer peripheral portion 15 may not extend along the plane, but may extend along the plane. Figure 7 The outer peripheral portion 15 shown extends in the opposite direction of protrusion along a curved surface that is bent in a manner protruding upward. Specifically, the outer peripheral portion 15 may also extend along a curved surface that is protruding upward and has a curvature smaller than that of the flange portion 13 in the cross section. In this case, the curvature of the outer peripheral portion 15 is also set, for example, so that the curvature of the extension direction line 11 does not cause the gasket 1 to jump up as described above. In addition, the inner peripheral portion 14 may also extend along a curved surface that is bent in a manner protruding upward. In this case, the gasket 1 also achieves the above-mentioned effect. In addition, either the inner peripheral portion 14 or the outer peripheral portion 15 may extend along a curved surface that is curved in a manner protruding upward, and the other may extend along a curved surface that is curved in a manner protruding downward.

[0068] In addition, if Figure 8 As shown, the inner peripheral portion 14 of the gasket 1 may not form a tapered portion in a free state, but may extend along a plane that is orthogonal or substantially orthogonal to the protruding direction line x. That is, in the gasket 1 in a free state, the angle β between the extension direction line l2 of the inner peripheral portion 14 and the protruding direction line x may be 90° or substantially 90°. In this case, the outer peripheral portion 15 of the gasket 1 also plays the above-mentioned role and effect. In addition, it is also possible that either the inner peripheral portion 14 or the outer peripheral portion 15 extends in a planar shape as described above (see Figure 2 ), the other extends in a curved shape as described above (refer to Figure 7 ).

[0069] While the embodiments of the present invention have been described above, the present invention is not limited to the aforementioned embodiments and encompasses all aspects of the present invention and the claims. Furthermore, various structures may be appropriately and selectively combined in a manner that achieves at least a portion of the aforementioned effects. For example, the shape, material, configuration, size, and manufacturing method of each component in the aforementioned embodiments may be appropriately modified based on the specific usage of the present invention.

[0070] For example, as described above, the covering layer 20 may not be provided on the entire upper surface 11 and the lower surface 12 of the metal substrate 10. The covering layer 20 may be provided on only a portion of the upper surface 11 or the lower surface 12. Alternatively, the covering layer 20 may be provided on only a portion of the upper surface 11 and the lower surface 12. In this case, the covering layer 20 is also provided on the upper surface 11 and the lower surface 12 in the portion forming the outer peripheral end portion 15b of the outer peripheral portion 15 and the seal lines s1 to s3.

[0071] Explanation of symbols:

[0072] 1. 110 sealing gasket

[0073] 10, 102, 111 metal substrate

[0074] 11 Upper surface (one of a pair of surfaces)

[0075] 12 Lower surface (the other surface of a pair of surfaces)

[0076] 13 flange

[0077] 13a outer periphery

[0078] 13b inner circumference

[0079] 13c top

[0080] 14, 103, 112 inner circumference

[0081] 14a inner periphery

[0082] 14b inner peripheral end

[0083] 15, 104, 113 peripheral part

[0084] 15a outer periphery

[0085] 15b outer peripheral end

[0086] 16 bolt hole plate

[0087] 20 covering layers

[0088] 30 bolt holes

[0089] 70, 71, 120, 121 parts

[0090] 70a, 71a plane

[0091] 100 sealing gasket structure

[0092] 101 metal sealing gasket

[0093] 105, 114 flange parts

[0094] 106, 116 rubber layer

[0095] 115 Bending Processing Department

[0096] l1, l2 extension direction lines

[0097] s1~s3 sealing line

[0098] x-protrusion direction line

[0099] Angles α and β

Claims

1. A sealing gasket comprising a metal substrate and a covering layer formed of an elastic body and covering at least a portion of the metal substrate, wherein: The metal base plate has a pair of surfaces facing away from each other, and has a flange portion as a portion protruding toward a side facing one of the pair of surfaces, an inner peripheral portion as a portion extending from an edge on an inner peripheral side of the flange portion, and an outer peripheral portion extending from an edge on an outer peripheral side of the flange portion in a free state before being sandwiched and mounted between two components. The outer peripheral portion extends from the edge of the outer peripheral side of the flange portion toward the outer peripheral side in a free state before the gasket is clamped and installed between two components of the installation object, and extends obliquely toward the side facing the other surface of the pair of surfaces relative to the protruding direction of the flange portion.

2. The sealing gasket according to claim 1, wherein The outer peripheral portion extends along a plane perpendicular to a direction in which the flange portion protrudes.

3. The sealing gasket according to claim 1, wherein The outer peripheral portion extends along a curved surface that protrudes toward the side facing the other surface and has a curvature smaller than that of the flange portion.

4. The sealing gasket according to any one of claims 1 to 3, wherein: The inner peripheral portion extends obliquely toward a side facing the other of the pair of surfaces relative to a direction in which the flange portion protrudes.

5. The sealing gasket according to claim 4, wherein: At least a portion of the inner peripheral portion is formed symmetrically with respect to the flange portion and at least a portion of the outer peripheral portion.

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