JP7353931B2 - gasket - Google Patents

Description

TECHNICAL FIELD The present invention relates to gaskets.

Conventionally, gaskets using so-called rubber coated metal (hereinafter also referred to as RCM), in which both sides of a metal plate are coated with a rubber material, have been widely used. For example, such a gasket may include a compound layer made of a synthetic resin or rubber material mixed with a fiber material that is laminated on both sides of an annular metal substrate, and an inner circumferential portion of the compound layer with a constant width in the thickness direction. A seal ring layer made of a synthetic resin or rubber material and integrally adhered to a compressed flattened layer is known (for example, see Patent Document 1).

International Publication No. 2008/065857

Incidentally, in recent years, users' demands for vehicles such as automobiles have become diverse, and in particular, the demand for quietness has increased, and demand for not only internal combustion engines but also electrical units (motors, inverters, converters, PCUs, etc.) has increased. (Power Control Unit, etc.) is also an issue. Silence has also come to be required of gaskets such as those described above. Conventional gaskets such as those described above have a thick steel plate in the center and have poor vibration and soundproofing functions. Furthermore, it has not been possible to secure sufficient assembly space for such conventional gaskets, and it has not been possible to use anti-vibration rubber or the like. For this reason, conventional gaskets have been required to have a structure that can improve vibration-proofing properties and sound-proofing properties against vibrations in vehicles and the like.

The present invention has been made in view of the above-mentioned problems, and an object thereof is to provide a gasket that can improve vibration-proofing properties and sound-proofing properties.

In order to achieve the above object, the gasket according to the present invention includes a pair of gasket members facing each other and having a metal plate and a rubber layer coated on both sides of the metal plate, and a gap between the pair of gasket members. A bead member having a metal plate and a pair of gasket members are respectively provided with an insertion hole through which a tightening member for attaching the pair of gasket members to the sealing object is inserted, and a through hole is provided at a position corresponding to each other. A compression amount regulating section is provided between the gasket members and regulating the amount of compression in the thickness direction of the pair of gasket members.

In the gasket according to one aspect of the present invention, the insertion holes are provided at positions corresponding to each other in each of the pair of gasket members, and the compression amount regulating portion is arranged between each of the pair of gasket members at the position of the insertion hole. It is located in

In the gasket according to one aspect of the present invention, the tightening member is a shaft-shaped member that is inserted into the insertion hole, and has a male screw portion formed with a screw thread that can be screwed into a screw hole formed in the sealing target. a screw head provided at one end of the male threaded portion; and a stepped portion in which no thread is formed between the male threaded portion and the screw head, and the compression amount regulating portion This is the stepped portion.

In the gasket according to one aspect of the present invention, the compression amount regulating portion is a member having a predetermined thickness in the thickness direction, and a through hole through which the tightening member can be inserted is provided at the position of the insertion hole.

A gasket according to one aspect of the present invention includes a connecting member that connects a pair of gasket members.

According to the gasket according to the present invention, vibration-proofing properties and sound-proofing properties can be improved.

FIG. 1 is a front view showing a schematic configuration of a gasket according to a first embodiment of the present invention. FIG. 2 is a sectional view taken along line AA of the gasket shown in FIG. 1; FIG. 2 is a cross-sectional view taken along line BB of the gasket shown in FIG. 1. FIG. FIG. 2 is a sectional view taken along line AA, showing the gasket shown in FIG. 1 in use. FIG. 2 is a cross-sectional view taken along line AA, showing the compressed state of the gasket shown in FIG. 1 in use. FIG. 3 is a sectional view taken along line AA to show the schematic structure of a gasket according to a second embodiment of the present invention. FIG. 7 is a sectional view taken along line AA to show the schematic configuration of a gasket according to a third embodiment of the present invention. FIG. 8 is a sectional view taken along line AA to show how the gasket shown in FIG. 7 is used.

Embodiments of the present invention will be described below with reference to the drawings.

[First embodiment]
FIG. 1 is a front view showing a schematic configuration of a gasket 1 according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of the gasket 1 taken along the line AA. FIG. 3 is a BB sectional view of the gasket 1.

Hereinafter, for convenience of explanation, one side (direction of arrow a) in the direction of axis Y1 (hereinafter also referred to as axial direction) which is the axis of gasket 1 in FIGS. shall be. Further, one side (direction of arrow c) in the radial direction extending perpendicularly to the axis Y1 of gasket 1 in FIGS. 1 to 3 is the inner peripheral side, and the other side (direction of arrow d) is the outer peripheral side. In the following explanation, when explaining the positional relationship and direction of each member as upper or lower, it only refers to the positional relationship and direction in the drawing, and indicates the positional relationship and direction when assembled in an actual vehicle etc. isn't it.

The gasket 1 can be used, for example, at a joint between a cylinder block and a cylinder head of an internal combustion engine to be sealed, a joint between an exhaust manifold and an exhaust pipe, an electrical unit (motor, inverter, converter, PCU, etc.), etc. It plays the role of sealing the gap between the two members. Note that the objects to which the gasket 1 is applied are not limited to those mentioned above.

As shown in FIGS. 1 to 3, the gasket 1 includes rubber layers (upper rubber layers 12u, 22u, lower A pair of gasket members (an upper gasket member 10 and a lower gasket member 20) having side rubber layers 12b and 22b and facing each other are provided. Further, the gasket 1 is disposed between the upper gasket member 10 and the lower gasket member 20, and includes a bead member 40 having a metal plate. Further, the gasket 1 is provided at positions corresponding to each other on the upper gasket member 10 and the lower gasket member 20, and functions as a tightening member for attaching the upper gasket member 10 and the lower gasket member 20 to the object to be sealed. Insertion holes 16 and 26 are provided through which the bolt 60 is inserted. Further, the gasket 1 is disposed between the upper gasket member 10 and the lower gasket member 20, and serves as a compression amount regulating portion that regulates the amount of compression in the thickness direction of the upper gasket member 10 and the lower gasket member 20. A section 61 is provided. The configuration of the gasket 1 will be specifically described below.

When the gasket 1 is in use, one of two members to be sealed in a vehicle such as an automobile, such as a cylinder head of an internal combustion engine, is placed above the gasket 1 (in the direction of arrow a). Further, when the gasket 1 is in use, the other of the two members to be sealed in a vehicle such as an automobile, such as a cylinder block of an internal combustion engine, is placed below the gasket 1 (in the direction of arrow b). The state of use of the gasket 1 will be described later.

In the gasket 1, the upper gasket member 10 has a rectangular outer shape with rounded corners, as shown in FIG. 1, and has a rectangular opening with rounded corners in its center. A portion 13 is formed. That is, the upper gasket member 10 is formed into an annular shape as a whole. The upper gasket member 10 is provided with a plurality of approximately semicircular (two in FIG. 1) positioning portions 14 that protrude from the outer peripheral surface of the upper gasket member 10 toward the outer peripheral side (in the direction of arrow d). As shown in FIG. 3, each of the positioning parts 14 is formed with a through hole 17 for passing through the connecting member 30. As shown in FIG. Further, the upper gasket member 10 is provided with a plurality of approximately semicircular (six in FIG. 1) bolt receivers 15 that protrude from the outer peripheral surface of the upper gasket member 10 toward the outer peripheral side (in the direction of arrow d). ing. As shown in FIG. 3, each of the bolt receiving parts 15 is formed with an insertion hole 16 for inserting a bolt 60 therethrough.

The upper gasket member 10 is made of rubber coated metal (hereinafter also referred to as RCM). That is, the upper gasket member 10 includes, as shown in FIG. The lower rubber layer 12b is coated on the lower surface 11b, which is the surface on the lower side (in the direction of arrow b).

The metal plate 11 is, for example, a steel plate, stainless steel, cold-rolled steel plate, galvanized steel plate, aluminum plywood, or the like. The upper rubber layer 12u and the lower rubber layer 12b are, for example, synthetic rubber (including foamed rubber) containing at least one of nitrile rubber, styrene-butadiene rubber, fluororubber, acrylic rubber, and silicone rubber.

In the gasket 1, the lower gasket member 20 has the same or substantially the same shape as the upper gasket member 10, as shown in FIG. That is, the lower gasket member 20 has a rectangular outer shape with rounded corners, and a rectangular opening 23 with rounded corners is formed in the center thereof. That is, the lower gasket member 20 is formed in an annular shape as a whole.

The lower gasket member 20 has a groove that protrudes from the outer circumferential surface of the lower gasket member 20 toward the outer circumferential side (in the direction of the arrow d) at the same position in the axial direction (in the direction of the arrow ab) as the positioning part 14 of the upper gasket member 10. A plurality of approximately semicircular (two in FIG. 1) positioning portions 24 are provided. As shown in FIG. 3, in the positioning portion 24, through holes 27 for passing through the connecting member 30 are formed at the same position in the axial direction (arrow a or b direction) as the through hole 17 of the upper gasket member 10. has been done. Further, the lower gasket member 20 has a plurality of approximately semicircular (six in FIG. 1) bolt receivers 25 that protrude from the outer peripheral surface of the lower gasket member 20 toward the outer peripheral side (in the direction of arrow d). It is provided. As shown in FIG. 3, insertion holes 26 for inserting bolts 60 are formed in the bolt receiving portions 25 at the same positions in the axial direction (arrow a or b direction) as the insertion holes 16 of the upper gasket member 10. has been done.

Lower gasket member 20 is RCM. In other words, as shown in FIG. 2, the lower gasket member 20 includes a metal plate 21, an upper rubber layer 22u covering an upper surface 21u which is the upper side (in the direction of arrow a) of the metal plate 21, and a metal plate 21. It has a lower rubber layer 22b covering a lower surface 21b, which is the surface on the lower side (in the direction of arrow b) of 21.

The metal plate 21 is, for example, a steel plate, stainless steel, cold-rolled steel plate, galvanized steel plate, aluminum plywood, or the like. The upper rubber layer 22u and the lower rubber layer 22b are, for example, synthetic rubber (including foamed rubber) containing at least one of nitrile rubber, styrene-butadiene rubber, fluororubber, acrylic rubber, and silicone rubber.

The lower gasket member 20 is disposed below the upper gasket member 10 (in the direction of arrow b), facing the upper gasket member 10. The lower gasket member 20 is held parallel or substantially parallel to the upper gasket member 10 in the width direction (arrow cd direction), which is a direction perpendicular to the extending direction of the lower gasket member 20 .

In the gasket 1, as shown in FIG. A lower caulking portion 32 is provided below the side rubber layer 22b (in the direction of arrow b). The connecting member 30 is inserted into and fixed in the through hole 17 of the upper gasket member 10 and the through hole 27 of the lower gasket member 20, and positions and holds the upper gasket member 10 and the lower gasket member 20. There is. The connecting member 30 is, for example, a rivet.

In the gasket 1, the bead member 40, like the upper gasket member 10 and the lower gasket member 20, has a rectangular outer shape with rounded corners. A rectangular opening is formed. That is, the bead member 40 is formed in an annular shape as a whole.

As shown in FIG. 2, the bead member 40 is located between the upper gasket member 10 and the lower gasket member 20, that is, below the upper gasket member 10 (in the direction of arrow b) and above the lower gasket member 20. (in the direction of arrow a). The lower surface 40b of the bead member 40 is in contact with the upper surface 22uu of the upper rubber layer 22u of the lower gasket member 20 (in the direction of the arrow a).

The width of the bead member 40 in the width direction (arrow CD direction) (the width in the direction perpendicular to the extending direction of the bead member 40) is greater than the width of the upper gasket member 10 and the lower gasket member 20 in the width direction (arrow CD direction). is also smaller. The bead member 40 is formed of a metal plate 41. The metal plate 41 is, for example, a steel plate, stainless steel, cold-rolled steel plate, galvanized steel plate, aluminum plywood, or the like.

The bead member 40 has a full bead portion 42 that is convex toward the upper side (direction of arrow a), and both sides of the bead member 40 (inner circumferential side (direction of arrow c) and outer circumferential side (direction of arrow d)) with the full bead portion 42 in between. It has a flat surface portion 43 which is a flat surface formed on the upper side (in the direction of arrow a) over the entire circumference. Specifically, the full bead portion 42 extends from the lower gasket member 20 side toward the upper gasket member 10 side between the flat portions 43 on both sides in the width direction (arrow CD direction), for example, in the center portion of the bead member 40. It is formed into an arcuate shape in cross section so that it bulges out. The full bead portion 42 has a top portion 42a that is the top portion in the axial direction (direction of arrow ab) of the full bead portion 42, and a lower surface 12bb that is the surface below the lower rubber layer 12b (direction of arrow b) of the upper gasket member 10. are in contact.

As shown in FIG. 3, the bead member 40 is located at the same position in the axial direction (arrow ab direction) as the positioning part 14 of the upper gasket member 10 and the positioning part 24 of the lower gasket member 20, from the outer peripheral surface of the flat part 43. A plurality of positioning portions 45 are provided that protrude toward the outer circumferential side (in the direction of arrow d). As shown in FIG. 3, the positioning portion 45 has a connecting member 30 at the same position in the axial direction (direction of arrow a or b) as the through hole 17 of the upper gasket member 10 and the through hole 27 of the lower gasket member 20. A through hole 44 is formed for passing through.

As described above, in the gasket 1 according to the first embodiment of the present invention, the bead member 40 has the full bead portion 42 that is convex toward the upper side (in the direction of the arrow a) over the entire circumference. That is, the gasket 1 according to the first embodiment of the present invention has a floating structure.

As shown in FIGS. 1 and 2, the bolt 60 has a stepped portion 61, a screw head 62, a male threaded portion 63, a lower boundary portion 64, and an upper boundary portion 65. When the longitudinal direction of the bolt 60 is the axial direction (the direction of the arrow a or b), the bolt 60 has a stepped portion 61 and a male screw portion formed in the shape of an axis, starting from a screw head 62 provided at one end and moving sequentially toward the other end. 63 is arranged in the b direction in FIG. The stepped portion 61 has a diameter different from that of the male threaded portion 63, and has no thread formed thereon. In other words, the bolt 60 is a so-called stepped bolt. The length of the stepped portion 61 (dimension in the thickness direction) is determined to a predetermined value based on the dimension in the thickness direction of the object to be sealed, the dimension in the thickness direction of the gasket 1, and the amount of compression of the gasket 1, as described later. There is. In the present invention, the compression amount regulating portion corresponding to the stepped portion 61 only needs to be able to regulate the amount of compression in the tightening direction of the tightening member (compression direction of the gasket) by the lower boundary portion 64. The diameter may be the same as that of the threaded portion, and the thread may simply not be formed.

The screw head 62 has a hexagonal hole formed at the top, for example, as shown in FIG. 1, so that the bolt 60 can be tightened with a tightening tool such as a wrench or a screwdriver. Note that the shape of the screw head 62 is not limited to the above-mentioned example; for example, a cross recess or the like may be formed, or the screw head may have a hexagonal shape. . The screw head 62 has a diameter different from that of the stepped portion 61 and the male screw portion 63, and an upper boundary portion 65 is formed at the neck portion at the boundary with the stepped portion 61 (shaft portion). Note that the shape of the screw head 62 and the shape of the thread of the male threaded portion 63 are not limited to the above-mentioned examples, and any suitable shape can be adopted. In use, the bolt 60 is inserted into the insertion hole 16 provided in the bolt receiving portion 15 of the upper gasket member 10 and the insertion hole 26 provided in the bolt receiving portion 25 of the lower gasket member 20 in the gasket 1. Ru.

Next, the usage condition of the gasket 1 will be explained.
FIG. 4 is a cross-sectional view taken along line AA, showing how the gasket 1 is used. As shown in FIG. 4, when the gasket 1 is in use, one of the two members to be sealed in a vehicle such as an automobile, such as the cylinder head of an internal combustion engine, is attached to the upper side (in the direction of arrow a) of the gasket 1. On the other hand, a housing 50 is arranged. On the other hand, the housing 50 is formed with a bolt insertion hole 52 having a diameter that allows the male threaded portion 63 and step portion 61 of the bolt 60 to be inserted therethrough. The bolt insertion hole 52 is formed at the same position as the insertion hole 16 of the upper gasket member 10 and the insertion hole 26 of the lower gasket member 20 in the axial direction (direction of arrow a or b). In addition, in FIG. 4, the other of the two members to be sealed in a vehicle such as an automobile, for example, the other housing 51 made of the cylinder block of an internal combustion engine, etc. is placed below the gasket 1 (in the direction of arrow b). It is located. On the other hand, the housing 51 is formed with a female threaded portion 53 which is a threaded hole having a diameter and thread shape that can be screwed into the male threaded portion 63 of the bolt 60 . The female screw portion 53 has a bolt insertion hole 52 in the housing 50, an insertion hole 16 in the upper gasket member 10, and an insertion hole 2 in the lower gasket member 20.
6 in the same position in the axial direction (arrow a or b direction).

In FIG. 4, the gasket 1 is interposed between one housing 50 and the other housing 51. In this state, the male threaded portion 63 and the stepped portion 61 of the bolt 60 are inserted into the bolt insertion hole 52 from the upper side of the one housing 50 to the lower side, and the male threaded portion 63 is inserted into the female screw portion of the other housing 51. It is screwed into the threaded portion 53. In this state, the stepped portion 61 provided on the bolt 60 is formed by the bolt insertion hole 52 of the housing 50, the insertion hole 16 of the upper gasket member 10 of the gasket 1B, and the insertion hole 26 of the lower gasket member 20 of the gasket 1B. It is placed in the space that is formed. In this state, the bead member 40 of the gasket 1 is not compressed, and only the top 42a of the full bead portion 42 is the lower side (in the direction of arrow b) of the lower rubber layer 12b of the upper gasket member 10. It is in contact with the bottom surface.

In this state, the distance from the surface 50u, which is the upper surface of one housing 50, to the surface 51u, which is the upper surface of the other housing 51, is defined as D1. In this state, the dimension of the bead member 40 in the compression direction, that is, the distance between the lower surface 12bb of the lower rubber layer 12b of the upper gasket member 10 and the upper surface 22uu of the upper rubber layer 22u of the lower gasket member 20 is defined as G1. .

FIG. 5 is a sectional view taken along line AA, showing the gasket 1 shown in FIG. 2 in a compressed state. When the gasket 1 is compressed by tightening the bolts 60 to one housing 50 and the other housing 51, the full bead portion 42 of the bead member 40 is pressed against the lower surface 12bb of the lower rubber layer 12b of the upper gasket member 10 and becomes elastic. transform. At this time, since the step portion 61 is provided on the bolt 60, the amount of compression in the axial direction (arrow ab direction) of the full bead portion 42 can be controlled, and the lower boundary portion 64 of the step portion 61 is connected to the other housing. The upper boundary portion 65 of the screw head 62 is in contact with the surface 50u of the housing 50 on the other hand. As a result, when the full bead portion 42 is compressed and restored, the spring stiffness in the full bead low stiffness region can be utilized.

In addition, in the state shown in FIG. 5, the distance from the surface 50u, which is the upper surface of one housing 50, to the surface 51u, which is the upper surface of the other housing 51, is D2. In this state, the dimension of the bead member 40 in the compression direction, that is, the distance between the lower surface 12bb of the lower rubber layer 12b of the upper gasket member 10 and the upper surface 22uu of the upper rubber layer 22u of the lower gasket member 20 is defined as G2. . The distance from the surface 50u to the surface 51u changes from D1 to D2 shown in FIG. 4 by tightening the bolt 60. Further, in this state, the dimension of the bead member 40 in the compression direction also changes from G1 shown in FIG. 4 to G2. In this state, since the distance D2 from the surface 50u to the surface 51u is regulated by the axial length L1 of the step 61 of the bolt 60, the compression direction dimension G2 of the bead member 40 also 61 and an upper boundary 65 of the screw head 62.

That is, the stepped portion 61 of the bolt 60 has a shim function that utilizes the low spring stiffness of the full bead portion 42 during compression and restoration. The lower the spring stiffness, the better the vibration and sound insulation properties. Accordingly, it is possible to improve vibration isolation and sound insulation against vibrations in automobiles and the like.

Further, in the gasket 1 according to the first embodiment of the present invention, when the gasket 1 is compressed, the lower surface 12bb of the lower rubber layer 12b of the upper gasket member 10 is connected to the full bead portion 42 of the bead member 40 and the flat portion. 43, it is possible to obtain the damping performance of rubber. Further, in the gasket 1 according to the first embodiment of the present invention, when the gasket 1 is compressed, the upper rubber layer 12u and the lower rubber layer 12b of the upper gasket member 10 and the upper side of the lower gasket member 20 Since the rubber layer 22u and the lower rubber layer 22b are provided, the damping performance of rubber can be obtained. Therefore, it is possible to further improve the vibration-proofing properties and soundproofing properties against vibrations in automobiles and the like.

Further, since the gasket 1 can have a shim function by the stepped portion 61 that functions as a compression amount regulating portion, by appropriately selecting the length of the stepped portion 61 in the axial direction, the amount of compression of the bead member 40 can be adjusted appropriately. Can be set.

[Second embodiment]
Next, a gasket 1A according to a second embodiment of the present invention will be described. Hereinafter, components having the same or similar functions as those of the gasket 1 according to the first embodiment described above will be denoted by the same reference numerals, and the description thereof will be omitted, and only the different components will be described.

FIG. 6 is a cross-sectional view taken along line AA, showing a schematic configuration of a gasket 1A according to the second embodiment of the present invention. In the second embodiment, the gasket 1A includes a plurality of upper gasket members 10 and a plurality of lower gasket members 20 (two in FIG. 6). As a result, according to the gasket 1A, when the gasket 1A is compressed, the damping properties of the rubber can be further obtained, so that the vibration-proofing properties and sound-proofing properties against vibrations in automobiles, etc. can be further improved. I can do it.

[Third embodiment]
Next, the configuration of a gasket 1B according to a third embodiment of the present invention will be described. Hereinafter, components having the same or similar functions as those of the gasket 1 according to the first embodiment described above will be denoted by the same reference numerals, and the description thereof will be omitted, and only the different components will be described.

FIG. 7 is a sectional view taken along line AA to show the schematic structure of a gasket 1B according to the third embodiment of the present invention. The gasket 1B according to the third embodiment includes a bolt 70 and a spacer 80 functioning as a compression amount regulating section in place of the bolt 60 of the gasket 1 according to the first embodiment.

The bolt 70 has a screw head 72, a male threaded portion 73, and a neck portion 75. When the longitudinal direction of the bolt 70 is the axial direction (arrow a or b direction), the male threaded portion 73 from the screw head 72 is arranged in the b direction in FIG. 7 . The bolt 70 differs from the bolt 60 described above in that it does not have the stepped portion 61, the lower boundary portion 64, and the upper boundary portion 65. In other words, the bolt 70 is a so-called full thread. Note that the bolt 70 is not fully threaded, but only needs to have the length of the male threaded portion 73 necessary to tighten the one housing 50 and the other housing 51 with the gasket 1 interposed therebetween.

The spacer 80 has an inner circumferential surface 81, a lower boundary part 82, and an upper boundary part 83. The spacer 80 is a hollow columnar member whose inner peripheral surface 81 is a through hole. The spacer 80 has a diameter and shape that allows it to be inserted into the bolt insertion hole 52 of the housing 50 . Specifically, when the bolt insertion hole 52 is a circular through hole, the spacer 80 is formed into a hollow cylindrical shape with a diameter slightly smaller than the diameter of the bolt insertion hole 52. Note that the shape of the spacer 80 functioning as the compression amount regulating section is not limited to the above example.

Next, the usage condition of the gasket 1B will be explained.
FIG. 8 is a cross-sectional view taken along line AA to show how the gasket 1B is used. As shown in FIG. 8, in the usage state of the gasket 1B, similar to the usage state of the gasket 1 described above, one of the two members to be sealed, the housing, is placed above the gasket 1 (in the direction of the arrow a). 50 are arranged. Further, the other casing 51 of the two members to be sealed is arranged below the gasket 1 (in the direction of arrow b). In this state, the spacer 80 is inserted into the space formed by the bolt insertion hole 52 of the housing 50 and the insertion hole 16 of the upper gasket member 10 and the insertion hole 26 of the lower gasket member 20 of the gasket 1B. be done. The spacer 80 is disposed inside the space defined by the bolt insertion hole 52 and the insertion holes 16 and 26, with the surface 51u of the other housing 51 and the lower boundary portion 82 in contact with each other. After the spacer 80 is arranged, the male screw portion 73 of the bolt 70 is inserted from the upper side of the housing 50 toward the lower side. The male threaded portion 73 can be screwed into the female threaded portion 53 of the other housing 51 .

Note that in this state, similarly to the gasket 1 described above, the distance from the surface 50u that is the upper surface of one housing 50 to the surface 51u that is the upper surface of the other housing 51 is set as D1. In this state, the dimension of the bead member 40 in the compression direction, that is, the distance between the lower surface 12bb of the lower rubber layer 12b of the upper gasket member 10 and the upper surface 22uu of the upper rubber layer 22u of the lower gasket member 20 is defined as G1. .

In this state, when the gasket 1B is compressed by tightening the bolt 70 to one housing 50 and the other housing 51, the full bead portion 42 of the bead member 40 is pressed against the lower surface 12bb of the lower rubber layer 12b of the upper gasket member 10. It is pressed and deforms elastically. At this time, since a spacer 80 is provided inside the space formed by the bolt insertion hole 52 through which the bolt 70 is inserted and the insertion holes 16 and 26, the spacer 80 is provided in the axial direction of the full bead portion 42 (arrow ab direction). The lower boundary 82 of the spacer 80 is in contact with the surface 51u of the other casing 51, and the upper boundary 83 of the spacer 80 is in contact with the surface 50u of the casing 50. As a result, when the full bead portion 42 is compressed and restored, the spring stiffness in the full bead low stiffness region can be utilized.

In addition, in the gasket 1B, the distance from the surface 50u to the surface 51u becomes shorter than D1 shown in FIG. 8 by tightening the bolt 70. Furthermore, in the gasket 1B, the dimension of the bead member 40 in the compression direction is also shorter than G1 shown in FIG. In this state, the distance from the surface 50u to the surface 51u is regulated by the axial length (dimension in the thickness direction) L1 of the spacer 80. Similarly, the size of the bead member 40 in the compression direction is also regulated by the spacer 80.

That is, when used in combination with the bolt 70, the spacer 80 has a shim function that utilizes the low spring stiffness of the full bead portion 42 during compression and restoration. Since the lower the spring stiffness, the better the vibration and sound insulation characteristics can be obtained. Accordingly, it is possible to improve vibration isolation and sound insulation against vibrations in automobiles and the like.

In addition, when the gasket 1B is compressed, the lower surface 12bb of the lower rubber layer 12b of the upper gasket member 10 comes into contact with the full bead portion 42 and the flat portion 43 of the bead member 40, so that the damping performance of the rubber is reduced. Obtainable. Further, when the gasket 1B is compressed, the upper rubber layer 12u and the lower rubber layer 12b of the upper gasket member 10 and the upper rubber layer 22u and the lower rubber layer 22b of the lower gasket member 20 are formed. Because of this, it is possible to obtain the damping performance of rubber. Therefore, it is possible to further improve the vibration-proofing properties and soundproofing properties against vibrations in automobiles and the like.

Further, since the gasket 1B can have a shim function with the spacer 80, the bolt 70 can be the same as a commonly used bolt. Further, in the gasket 1B, the amount of compression of the bead member 40 can be appropriately set by appropriately selecting the length of the spacer 80 in the axial direction.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, but includes all aspects included within the concept of the present invention and the scope of the claims. Moreover, each structure may be selectively combined as appropriate so as to achieve at least some of the problems and effects described above. Further, for example, the shape, material, arrangement, size, etc. of each component in the above embodiments may be changed as appropriate depending on the specific usage mode of the present invention.

For example, in the gasket 1 according to the embodiment of the present invention, the embodiment of the present invention has been described using as an example a case where a rivet is used as the connecting member 30 that connects the upper gasket member 10 and the lower gasket member 20. . However, the present invention is not limited to this, and the upper gasket member 10 and the lower gasket member 20 may be connected by various methods. For example, the positioning portion 14 of the upper gasket member 10 and the positioning portion 24 of the lower gasket member 20 may be connected by welding. Alternatively, the upper gasket member 10 and the lower gasket member 20 may be connected by forming a slit in the positioning portion 24 of the lower gasket member 20 and inserting the positioning portion 14 of the upper gasket member 10 therein.

DESCRIPTION OF SYMBOLS 1... Gasket, 10... Upper gasket member, 11... Metal plate, 11b... Lower surface, 11u... Upper surface, 12b... Lower rubber layer, 12bb... Lower surface, 12u... Upper rubber layer, 13... Opening, 14... Positioning part, 15... Bolt receiver, 16... Insertion hole, 17... Through hole, 20... Lower gasket member, 21... Metal plate, 21b... Lower surface, 21u... Upper surface, 22b... Lower rubber layer, 22u... Upper rubber layer, 22uu ...Top surface, 23...Opening, 24...Positioning part, 25...Bolt receiver, 26...Insertion hole, 27...Through hole, 30...Connection member, 31...Upper caulking part, 32...Lower caulking part, 40...Bead Member, 40b...bottom surface, 40u...top surface, 41...metal plate, 42...full bead part, 42a...top part, 43...plane part, 44...through hole, 45...positioning part, 50...one housing, 51...other housing , Y1...axis line

Claims (5)

a pair of gasket members facing each other and having a metal plate and a rubber layer coated on both sides of the metal plate;
a bead member disposed between the pair of gasket members and having a metal plate;
an insertion hole provided in each of the pair of gasket members at a position corresponding to each other, through which a tightening member for attaching the pair of gasket members to a sealing target is inserted;
a compression amount regulating part that is disposed between the pair of gasket members and regulates the amount of compression in the thickness direction of the pair of gasket members;
Equipped with
The tightening member is a shaft-shaped member that is inserted into the insertion hole, and includes a male threaded portion having a thread that can be screwed into a threaded hole formed in the sealing object, and a male threaded portion of the male threaded portion. a screw head provided at one end;
The objects to be sealed are one casing provided with a bolt insertion hole through which the male threaded portion can pass, and the other casing formed with a female threaded portion that can be screwed into the male threaded portion,
The compression amount regulating portion is a gasket in which a lower boundary portion regulates the position of the other housing, and an upper boundary portion regulates the position of the one housing. The insertion holes are provided at mutually corresponding positions in each of the pair of gasket members,
The compression amount regulating portion is disposed between each of the pair of gasket members at the position of the insertion hole.
The gasket according to claim 1. The tightening member includes a stepped portion in which no thread is formed between the male threaded portion and the screw head,
The compression amount regulating portion is the stepped portion of the tightening member,
The gasket according to claim 1 or 2. The compression amount regulating portion is a member having a predetermined thickness in the thickness direction, and is provided with a through hole through which the male screw portion can be inserted at a position of the insertion hole.
The gasket according to claim 1 or 2. comprising a connecting member that connects the pair of gasket members;
A gasket according to any one of claims 1 to 4.

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