JP2016125582A - Laminated gasket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminated gasket which exerts favorable seal performance by a simple constitution in a fastening atmosphere in which the rigidity of a flange is lowered, a fastening load is lowered, and an in-bolt distance becomes long.SOLUTION: A laminated gasket grips and fixes an intermediate plate 3 between a pair of plate main bodies 2, 2 having annular beads 22, respectively, and seals flange faces by the annular beads 22 of a pair of the plate main bodies 2, 2 by the fastening of a fastening member between the opposing flange faces of an apparatus. A penetration hole 21 penetrated with a shaft part of the fastening member is formed at the plate main body 2, the intermediate plate 3 is extended to an external edge direction, the extended external edge is bent to the plate main body 2 side, and spacer parts 4 having magnitudes not hindering the sealing of the annular beads 22 are formed at the intermediate plate 3. Penetration holes 41 are formed at the intermediate plate 3 and the bent spacer parts 4 corresponding to penetration holes 23 of the plate main body 2.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a laminated gasket, and more particularly to a laminated gasket that is used in equipment such as an oil pipe used in automobiles and the like and is sandwiched to improve the airtightness of the equipment.

  Conventionally, a sealing structure or a sealing method has been widely used as a sealing structure used in automobiles. The gasket provided between the flange surfaces is tightened with a tightening member such as a bolt so that a bead as a seal portion of the gasket is brought into close contact between the flange surfaces, thereby improving the airtightness of the device.

  2. Description of the Related Art In recent years, electrical components and electric devices for automobiles have been required to be smaller and lighter, so that the members constituting the electrical components and the electric devices have been reduced in rigidity. On the other hand, there are many cases where various electrical components are mounted on one case, and the case itself may be large. In addition, the distance between the bolts tends to increase in view of the number of bolt fastening points. Here, there is a request to reduce the size and weight, and a small bolt is used, and there is also a request to close once from a request to shorten the bolt tightening cycle time. For this reason, when a gasket is mounted using bolts, the compression load of the gasket tends to decrease.

  In invention of patent document 1, favorable sealing performance is ensured by comprising a gasket as a composite structure of the composite member which has a metal plate and a rubber layer.

JP 2012-219818 A

  2. Description of the Related Art Conventionally, a configuration in which a bead is provided on a gasket has been widely used in order to ensure the sealing performance of a gasket used in an environment such as a decrease in tightening load and deterioration on a flange surface due to low rigidity. A gasket with a high bead height can be used at a position away from the bolt, and when a laminated gasket is used, although the bolt tightening torque is generated when the gasket is assembled, the mating housing is secured by tightening the bolt. The seating property is poor, such as the body tilting and the prescribed axial force is not generated. On the other hand, it is conceivable to apply a gradually changing bead such as lowering only the bead directly under the bolt, that is, expanding the bead width, but there is a concern that the sealing performance may be lowered by lowering the bead.

  On the other hand, in the technique of Patent Document 1, a good sealing property can be secured even in a tightening environment in which the tightening load is reduced and the distance between the bolts is increased. However, in the manufacture of a composite structure of a metal plate and a composite member. In addition, the structure is relatively complicated, and it is not easy to align the metal plate such as a steel plate with the composite member.

  Therefore, an object of the present invention is to provide a laminated gasket that exhibits a good sealing property in a tightening environment in which a flange has a low rigidity, a tightening load is reduced, and a distance between bolts is increased by a simple structure.

  Other problems of the present invention will become apparent from the following description.

  The above problems are solved by the following inventions.

1. An intermediate plate is sandwiched and fixed between a pair of plate bodies each having an annular bead, and the flange surface is sealed by the annular beads of the pair of plate bodies by tightening with a fastening member between the opposing flange surfaces of the device. A gasket,
In the plate body, a through hole through which the shaft portion of the fastening member passes,
In the intermediate plate, the intermediate plate is extended in the direction of the outer edge, the extended outer edge is bent toward the plate body side, and a spacer portion is formed with a size that does not interfere with the seal of the annular bead. A laminated gasket, wherein a through hole is provided in the intermediate plate at a position corresponding to the through hole of the plate body and the bent spacer portion.

2. An intermediate plate is sandwiched and fixed between a pair of plate bodies each having an annular bead, and the flange surface is sealed by the annular beads of the pair of plate bodies by tightening with a fastening member between the opposing flange surfaces of the device. A gasket,
The plate body and the intermediate plate have a through hole through which the shaft portion of the fastening member passes,
A spacer portion having a size that does not hinder the seal of the annular bead and having the same type of through hole as the inside is inserted between the plate body and the intermediate plate, and then the plate body and the intermediate plate are inserted. A laminated gasket characterized by being clamped and fixed.

3. An intermediate plate is sandwiched and fixed between a pair of plate bodies each having an annular bead, and the flange surface is sealed by the annular beads of the pair of plate bodies by tightening with a fastening member between the opposing flange surfaces of the device. A gasket,
The plate body and the intermediate plate have a through hole through which the shaft portion of the fastening member passes,
The outer peripheral shape of the clamping and fixing portion of the pair of plate main bodies and the intermediate plate covers the outer periphery of the through holes of the plate main body and the intermediate plate, and a spacer portion at a position that does not interfere with the seal of the annular bead, A laminated gasket characterized in that a through hole is provided in a spacer portion at a position corresponding to the through hole of the plate body and the intermediate plate while being inserted and fixed between the plate body and the intermediate plate.

  According to the present invention, the bead can be obtained by increasing the gasket thickness of the seat surface immediately below the bolt, which becomes the fixing portion, by inserting the spacer portion between the plate main bodies between the plate bodies and inserting and fixing the spacer portion. Multilayer gasket that shows good sealing performance even in a tightening environment where the tightening load decreases and the distance between bolts increases with the difference in height and bolt seating surface height reduced and seating performance of the bolt improved. Can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which shows the laminated gasket concerning this invention, (a) is a top view of a laminated gasket, (b) is a top view of the gasket main body used for this invention, (b) is an intermediate gasket used for this invention. Plan view The exploded perspective view of the lamination gasket concerning the present invention Enlarged sectional view taken along line (iii)-(iii) in FIG. Enlarged cross-sectional view along line (iv)-(iv) in FIG. When the present invention is attached to a flange, an enlarged cross-sectional explanatory view taken along line 1 (v)-(v) It is explanatory drawing which shows the 2nd embodiment which shows the laminated gasket concerning this invention, (a) is a top view of a laminated gasket, (b) is a top view of a gasket main body, (c) is a top view of an intermediate gasket. It is explanatory drawing which shows the 3rd embodiment which shows the laminated gasket concerning this invention, (a) is a top view of a laminated gasket, (b) is a top view of a gasket main body, (c) is a top view of an intermediate gasket, (D) is a plan view showing the spacer portion It is explanatory drawing which shows the 4th embodiment which shows the laminated gasket concerning this invention, (a) is a top view of a laminated gasket, (b) is a top view of a gasket main body, (c) is a top view of an intermediate gasket, (D) is a plan view showing the spacer portion

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 is an explanatory view showing a laminated gasket according to the present invention, wherein (a) is a plan view of the laminated gasket, (b) is a plan view of a gasket body used in the present invention, and (c) is used in the present invention. FIG. 2 is an exploded perspective view of the laminated gasket according to the present invention, FIG. 3 is an enlarged cross-sectional view taken along line (iii)-(iii) of FIG. 1, and FIG. (Iv)-(iv) line sectional explanatory drawing, FIG. 5: is an expanded sectional explanatory drawing which follows FIG.1 (v)-(v) line, when this invention is attached to a flange.

  The laminated gasket 1 has a configuration in which the intermediate plate 3 and the spacer portion 4 are sandwiched between a pair of plate bodies 2 and 2 and are sandwiched and fixed by a fixing tool such as a rivet 5, which will be described in detail below.

  The plate bodies 2 and 2 are provided with an opening 21 serving as a flow path of a fluid to be sealed and an annular bead 22 formed around the opening 21 at the center of a thin metal plate having elasticity. Yes.

  Further, on the outside of the annular beads 22 of the plate bodies 2 and 2, an appropriate number of through holes 23 through which a fastening member 7 such as a bolt for fastening between flanges 60 and 61 described later is inserted, and a pair of A caulking hole 24 is provided that is used when caulking with a rivet 5 that sandwiches and fixes the plate bodies 2 and 2 and the intermediate plate 3.

  The intermediate plate 3 has substantially the same outer shape as the plate main bodies 2 and 2 described above, and has the opening 31 and the through holes 33 at the same positions as the opening 21, the through hole 23 and the caulking hole 24 of the plate main bodies 2 and 2, respectively. The caulking hole 34 is formed.

  Further, as shown in FIG. 1C, the intermediate plate 3 extends in the direction of the outer edge of each through-hole 33, and the extended outer edge is formed as a spacer portion 4. Each spacer portion 4 is bent in the same direction by a bent portion 32 so as to be stacked on the intermediate plate 2 as shown in the dotted line of FIG. 1, FIG. 2, and FIG. 4. The spacer 4 has a through hole 41 at the same position as the through hole 33 of the intermediate plate 2.

  The spacer portion 4 is formed such that the tip bent at the bent portion 32 does not interfere with the sealing operation of the annular bead 22. This is because the seating property of the bolt is improved by bringing the thickness of the portion having the spacer portion 4 close to the thickness of the portion having the annular bead 22 within a range that does not hinder the sealing operation.

  The plate bodies 2 and 2 are respectively arranged so that the convex portion of the annular bead 22 is on the upper and lower sides around the intermediate plate 3 in which the spacer portion 4 is bent. Then, the caulking holes 24 and 34 of the plate bodies 2 and 2 and the intermediate plate 3 are caulked and fixed by the rivets 5 to form the laminated gasket 1.

  Here, the portion having the spacer portion 4 of the laminated gasket 1 after the spacer portion 4 is inserted has a thickness T as shown in FIG. On the other hand, in the portions of the openings 21 and 31 where the spacer portion 4 is not interposed, as shown in FIG. 3, the thickness includes the height of the intermediate plate 3, the plate body 2, 2 and the annular bead 22. This portion has a thickness H. Therefore, by making the thickness T of the portion having the spacer portion 4 smaller than the thickness H of the laminated gasket 1 of the annular bead 22 portion, the annular bead 22 is displaced during the tightening operation of the fastening member 7 described later, and the flange 60, 61.

  In addition, as a material used for the plate main bodies 2 and 2, the intermediate | middle plate 3, and the spacer part 4, a stainless steel plate, a SPCC steel plate, an aluminum steel plate etc. are mentioned. These steel sheets may be subjected to a known chemical conversion treatment after alkali degreasing to form a rust preventive film. In addition, zinc phosphate and iron phosphate coatings may be formed on the SPCC steel sheet. The steel plate surface may be roughened such as shot blast or scotch blast.

  Further, an elastic material may be coated on the surfaces of the plate bodies 2 and 2, the intermediate plate 3, and the spacer portion 4. Examples of the elastic material include nitrile rubber (NBR), hydrogenated nitrile rubber (H—NBR), functional group-modified nitrile rubber (hereinafter also simply referred to as “NBR”), and foamed rubber thereof.

  Next, an assembling operation of the laminated gasket 1 will be described.

  The laminated gasket 1 configured as described above is disposed between the flange surfaces 60 and 61 facing each other as shown in FIG. Then, the fastening member 7 such as a bolt is inserted into the through holes 23, 33, 41 to perform the fastening operation of the fastening member 7.

  At this time, since the spacer portion 4 is inserted in the vicinity of the fastening member 7, the difference between the thickness T of the seating surface portion of the fastening member 7 and the thickness H including the annular bead 22 is reduced, and the annular shape is reduced. It is possible to approach a state in which a preferable sealing property of the bead 22 can be obtained. Then, by tightening the tightening member 7, the annular bead 22 is brought into close contact with the surfaces of the flanges 60 and 61, and the inclination of the flange 60 is suppressed, so that the seating property of the tightening member 7 can be improved.

  FIG. 6 shows a second embodiment, in which a spacer portion 4 is formed on one side of the intermediate plate 3 that does not have the caulking hole 34 to form a spacer portion, and the extension portion is folded. Used by bending at the curved portion 32.

  Here, since the site | part of the same code | symbol as FIGS. 1-5 has shown the site | part of the same structure, those description uses the description of FIGS. 1-5, and abbreviate | omits here.

  Compared to the first embodiment, the number of bending work steps can be reduced. The bent portion 32 may be provided on the caulking side when the caulking hole 34 can be removed without any problem.

  In the third embodiment shown in FIG. 7, the spacer 40 has a size that does not hinder the sealing of the annular bead 22, and is located at the same position as the through hole 23 and the caulking hole 24 of the plate body 2, 2. A through hole 41 and a caulking hole 42 are provided. Then, after the spacer portion 40 is inserted between the plate bodies 2 and 2 and the intermediate plate 3, the plate body 1 and the intermediate plate 3 are sandwiched and fixed by rivets 5.

  Here, since the site | part of the same code | symbol as FIGS. 1-5 has shown the site | part of the same structure, those description uses the description of FIGS. 1-5, and abbreviate | omits here.

  In this embodiment, since the thickness of the spacer part 40 can be set to a desired thickness, the thickness of the spacer part 40 that can obtain a preferable sealing state with respect to the height of the annular bead 21 is set to the spacer part 40. It can be easily obtained by changing the thickness of the. Moreover, it can reduce in weight by making the spacer part 40 into a lighter material. Further, since the through holes 41 and the caulking holes 42 are provided at the same positions as the through holes 23 and the caulking holes 24 of the plate bodies 2 and 2, the alignment operation is easy and the assembly process can be simplified. Moreover, since there is no above-mentioned bending part, there also exists an advantage by which a spring back does not arise in the crimping part of a rivet.

  In the fourth embodiment shown in FIG. 8, the spacer portion 400 is provided with a through hole 41 having the same size as the through holes 23 and 33 of the plate bodies 2 and 2 and the intermediate plate 3. And after inserting this spacer part 400 between the said plate main bodies 2 and 2 and the said intermediate | middle plate 3, the said plate main body 1 and the said intermediate | middle plate 3 are clamped and fixed with the rivet 5. FIG.

  Here, since the site | part of the same code | symbol as FIGS. 1-5 has shown the site | part of the same structure, those description uses the description of FIGS. 1-5, and abbreviate | omits here.

  In this embodiment, since the thickness of the spacer part 400 can be set to a desired thickness, the thickness of the spacer part 400 that can obtain a preferable sealing state with respect to the height of the annular bead 21 is set to the spacer part 400. The spacer 400 itself can be obtained simply by changing the thickness, and the spacer 400 itself can be reduced in cost and weight with a simple shape. In addition, since the bent portion is not provided, the caulking portion of the rivet 5 has a spring. There is also an advantage that back does not occur.

1: Laminated gasket 2: Plate body 21: Opening portion 22: Circular bead 23: Through hole 24: Caulking hole 3: Intermediate plate 31: Opening portion 32: Bending portion 33: Through hole 34: Caulking hole 4, 40, 400 : Spacer part 41: Through hole 42: Caulking hole 5: Rivet 60, 61: Flange 7: Tightening member

Claims (3)

An intermediate plate is sandwiched and fixed between a pair of plate bodies each having an annular bead, and the flange surface is sealed by the annular beads of the pair of plate bodies by tightening with a fastening member between the opposing flange surfaces of the device. A gasket,
In the plate body, a through hole through which the shaft portion of the fastening member passes,
In the intermediate plate, the intermediate plate is extended in the direction of the outer edge, the extended outer edge is bent toward the plate body side, and a spacer portion is formed with a size that does not interfere with the seal of the annular bead. A laminated gasket, wherein a through hole is provided in the intermediate plate at a position corresponding to the through hole of the plate body and the bent spacer portion. An intermediate plate is sandwiched and fixed between a pair of plate bodies each having an annular bead, and the flange surface is sealed by the annular beads of the pair of plate bodies by tightening with a fastening member between the opposing flange surfaces of the device. A gasket,
The plate body and the intermediate plate have a through hole through which the shaft portion of the fastening member passes,
A spacer portion having a size that does not hinder the seal of the annular bead and having the same type of through hole as the inside is inserted between the plate body and the intermediate plate, and then the plate body and the intermediate plate are inserted. A laminated gasket characterized by being clamped and fixed. An intermediate plate is sandwiched and fixed between a pair of plate bodies each having an annular bead, and the flange surface is sealed by the annular beads of the pair of plate bodies by tightening with a fastening member between the opposing flange surfaces of the device. A gasket,
The plate body and the intermediate plate have a through hole through which the shaft portion of the fastening member passes,
The outer peripheral shape of the clamping and fixing portion of the pair of plate main bodies and the intermediate plate covers the outer periphery of the through holes of the plate main body and the intermediate plate, and a spacer portion at a position that does not interfere with the seal of the annular bead, A laminated gasket characterized in that a through hole is provided in a spacer portion at a position corresponding to the through hole of the plate body and the intermediate plate while being inserted and fixed between the plate body and the intermediate plate.

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