JP2014228077A - Metal gasket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a metal gasket capable of reducing the volume of a gap in a space due to filling shortage of filler and suppressing generation of permanent set-in fatigue.SOLUTION: A metal gasket 20 includes filler 22 contained in an internal space section 23 surrounded by metal 21. A part of an object containing the filler 22 in the internal space section 23 surrounded by the metal 21 is compressed, and thereby the metal gasket 20 is constituted to have a compression part 21e in which a part of the metal 21 and a part of the filler 22 are brought into contact.

Description

  The present invention relates to a metal gasket.

  Conventionally, there is a case where a metal gasket is used as a member for sealing between two members connected in a special environment such as high temperature and high pressure.

  As such a metal gasket, for example, the durability and sealability are ensured by covering the filler with a metal material, such as the one disposed between the engine body which is an internal combustion engine and the exhaust manifold. (For example, refer to Patent Document 1) has been proposed.

Japanese Patent Laying-Open No. 2005-290359 (FIG. 13)

  However, in the conventional metal gasket as described above, it is very difficult to fill the entire area of the space surrounded by the metal material. Further, when the filling amount of the filler is insufficient, there is a problem that the metal gasket sags and the sealing performance is impaired.

  The present invention has been made in order to solve the above-described conventional problems, and can reduce the volume of the gap in the space due to insufficient filling of the filler and suppress the occurrence of sag. An object is to provide a gasket.

  In order to achieve the above object, the metal gasket according to the present invention is (1) a metal gasket including a metal material and a filler included in the space surrounded by the metal material. A part of the material containing the filler is compressed so as to have a concave part in which a part of the metal material and a part of the filler are brought into contact with each other.

  With this configuration, it is possible to reduce the volume of the space for covering the filler by forming a recess by compressing a part of the metal material, and to increase the filling rate of the filler with respect to the space. Thereby, the volume of the gap in the space due to insufficient filling of the filler can be reduced, and the occurrence of sag can be suppressed.

  The metal gasket which concerns on this invention is a metal gasket as described in said (1), (2) The said filler is comprised so that the part to be divided by a division | segmentation or a ditch | groove may be formed in the position corresponding to the said crevice.

  With this configuration, the filler can be accurately divided when the recess is formed.

  The metal gasket according to the present invention is the metal gasket according to the above (1) or (2), wherein (3) the space has one side as a target fluid side with the concave portion as a boundary, and the concave portion is defined as the target fluid. It forms so that it may approach to the side.

  With this configuration, it is possible to positively increase the filling rate of the filler on the target fluid side, which is the cause of the metal gasket sag, and to reduce the amount of sag in the space due to insufficient filling of the filler. The volume of the gap can be reduced, and the occurrence of sag can be further suppressed.

  Moreover, the metal gasket which concerns on this invention is a metal gasket as described in said (3), (4) The said recessed part is inclined and comprised so that the said filler may be extruded to the said target fluid side in the compression process.

  With this configuration, when the recess is formed in the compression process, the filler is pushed out to the target fluid side, and the filling rate of the filler in the divided space on the target fluid side can be increased.

  The metal gasket according to the present invention is the metal gasket according to the above (1) to (4), wherein (5) the concave portion is recessed with one surface portion of the facing surface portion of the metal material facing the other surface portion. The one surface portion and the other surface portion are configured to be joined by laser welding.

  With this configuration, in the mating structure portion of the member to be sealed located on the one surface portion and the other surface portion of the metal gasket, the other surface portion can be aligned and flush with the joint surface portion, and sealing performance can be easily ensured. . In addition, it is possible to suppress the deterioration of the filler due to the gas component in the mating joint surface portion.

  ADVANTAGE OF THE INVENTION According to this invention, the volume of the clearance gap in the space accompanying the insufficient filling of a filler can be reduced, and the metal gasket which can suppress generation | occurrence | production of a sag can be provided.

It is a perspective view of the supercharger which can mount the metal gasket which concerns on the 1st Embodiment of this invention. It is sectional drawing of the principal part of the use condition in the metal gasket which concerns on the 1st Embodiment of this invention. The metal gasket which concerns on the 1st Embodiment of this invention is shown, (A) is a top view of a metal gasket, (B) is an expanded sectional view which follows the BB line of (A). It is explanatory drawing which shows the formation process of the metal gasket which concerns on the 1st Embodiment of this invention in time series. The filler in the metal gasket which concerns on other embodiment of this invention is shown, (A) is sectional drawing of the principal part in the case of the filler in 1st Embodiment which has not formed the part to be divided, (B ) Is a cross-sectional view of the main part in the case of the filler in the second embodiment divided as a part to be divided, and (C) is the case in the filler in the third embodiment in which a concave groove is formed as the part to be divided. It is sectional drawing of the principal part.

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

(First embodiment)
First, the configuration will be described.
As shown in FIG. 1, the metal gasket of the present embodiment can be mounted on a supercharger 1 such as a turbocharger used in an internal combustion engine for automobiles.

  The supercharger 1 includes a center housing 2, a turbine housing 3, and a compressor housing 4. The center housing 2 rotatably supports a connecting shaft (not shown). The turbine housing 3 contains a turbine wheel (not shown), and the compressor housing 4 contains a compressor impeller (not shown).

  The connecting shaft of the center housing 2 has a turbine wheel of the turbine housing 3 attached to one end and a compressor impeller of the compressor housing 4 attached to the other end, and these are rotated together.

  In the supercharger 1, the turbine wheel in the turbine housing 3 is rotated by the energy of the exhaust, and the compressor impeller in the compressor housing 4 is rotated accordingly. The intake air is supercharged by the rotation of the compressor impeller, and the supercharged air is forcibly sent into the combustion chamber of each cylinder of an engine (not shown).

  Further, the supercharger 1 opens and closes an exhaust bypass passage that communicates the upstream side and the downstream side of the turbine wheel with the wastegate valve 5 and adjusts the opening degree of the wastegate valve 5 by the actuator 6. ing.

  In addition, the specific structure, function, etc. of the supercharger 1 mentioned above are well-known techniques, and the metal gasket applied to this Embodiment is not limitedly applied to this supercharger 1. .

  In the turbine housing 3, a plurality of mounting bolts 7 are vertically raised on an end surface portion 3 a at the tip serving as an exhaust intake port. As shown in FIG. 2, an exhaust manifold 8 is connected to the turbine housing 3 so that exhaust gas P from a combustion chamber of an engine (not shown) is sent into the exhaust path 9.

  The exhaust manifold 8 is connected to the turbine housing 3 in a state in which the end surface portion 8 a is aligned with the end surface portion 3 a of the turbine housing 3 and communicates with the exhaust passage 9. The exhaust manifold 8 is connected to the turbine housing 3 in a state where the joint surface portion is in close contact by screwing the nut 10 to the mounting bolt 7 in the connected state. The exhaust manifold 8 is formed with a recess 8b that opens to the end surface 8a, and the metal gasket 20 is accommodated in the recess 8a.

  In the present embodiment, the recess 8b is open only to the end face portion 8a, but is optional depending on the shape and function of the metal gasket 20 such as opening to the exhaust path 9 as well. The depth of the recess 8 b is formed shallower than the thickness of the metal gasket 20 in a state before the exhaust manifold 8 is fastened to the turbine housing 3. Therefore, when the exhaust manifold 8 is fastened to the turbine housing 3, the metal gasket 20 is compressed in the thickness direction by the pressure, and comes into close contact with the bottom surface portion and the end surface portion 3 a of the recess 8 b.

  The arrangement of the metal gasket 20 and the specific configuration of the connection portion between the turbine housing 3 and the exhaust manifold 8 are known techniques, and the metal gasket 20 applied to the present embodiment has such a connection structure. The present invention is not limited to the above.

  As shown in FIG. 3A, the metal gasket 20 is formed in a substantially perfect circular shape. As shown in FIG. 3B, the metal gasket 20 includes a metal material 21 and a filler 22 covered with the metal material 21. The metal gasket 20 is not limited to a substantially perfect circle. The metal material 21 is configured by pressing a metal plate made of SUS or the like. The filler 22 is contained in an internal space 23 surrounded by the metal material 21 and is made of aluminum oxide (alumina).

  The metal material 21 forms an inner space portion 23 having a closed cross section so as to cover the filler 22. In the present embodiment, part of the metal material 21 and part of the filler 22 are brought into contact with each other by compressing a part of the internal space 23 surrounded by the metal material 21 so as to include the filler 22. The compression unit 21e is provided. That is, the metal material 21 is formed by compressing a part of a region between the inner end 21a and the outer end 21b in a state where the filler 22 is covered, and thereby a part of the upper surface portion 21c and the lower surface portion 21d facing each other. The compression part 21e as a recessed part which contacts is formed.

  Thereby, the compression part 21e divides the filler 22 into the inner peripheral side filler 22a and the outer peripheral side filler 22b. At the same time, the compression unit 21e is configured to divide the internal space part 23 so as to be separated into an inner circumferential side space part 23a and an outer circumferential side space part 23b. Therefore, the compression part 21e serves as a dividing boundary with respect to the filler 22 and the internal space part 23.

  In the present embodiment, the compression portion 21 e is formed in a continuous annular shape on the appearance of the annular metal gasket 20. Therefore, in the internal space portion 23, the compression portion 21e has the same ratio in the cross-sectional area between the inner peripheral space portion 23a and the outer peripheral space portion 23b from the inner end 21a to the outer end 21b at any position. be able to.

  The internal space portion 23 has a smaller volume than that before the compression portion 21e is formed by forming the compression portion 21e. Therefore, also in the filler 22, the filling rate is higher after the compression part 21e is formed than before the compression part 21e is formed.

  As shown in FIG. 2, the inner end 21a corresponds to the target fluid side according to the present invention because the exhaust gas P passes through the exhaust passage 9. Furthermore, the upper surface portion 21c corresponds to one surface portion according to the present invention, and the lower surface portion 21d corresponds to the other surface portion according to the present invention.

  The compression portion 21e is formed at a position offset from the inner end 21a in the region from the inner end 21a to the outer end 21b, so that the cross-sectional area of the inner peripheral space portion 23a is larger than the cross-sectional area of the outer peripheral space portion 23b. Is also getting smaller.

  The compression portion 21e forms an inclined portion 21f that is inclined so as to push the filler 22 toward the inner end 21a on the target fluid side in a compression step described later. The compression part 21e has the upper surface part 21c of the metal material 21 recessed toward the lower surface part 21d, and the upper surface part 21c and the lower surface part 21d are joined by laser welding, for example, YAG laser welding.

Next, the molding procedure of the metal gasket 20 of the present embodiment will be described.
First, a workpiece plate to be a metal material 21 having a hole opened in the vicinity of the center in advance is prepared, and as shown in FIG. 4, a rising on the inner peripheral side and a rising on the outer peripheral side are formed so as to surround the opening by burring. A burring process is performed. In this burring step, the filler 22 may be performed in a state where it is not set in the mold, or may be set first when the subsequent steps are performed in a series of lines. FIG. 4 schematically shows only the die 51 of the mold used in the burring process.

  Next, a punch 52 having a substantially corrugated shape is used as the processing surface, and the inner peripheral side of the processed plate on the upper surface portion 21c side is set to the outer peripheral side and the outer peripheral side is set to maintain the flat state of the lower surface portion 21d after the molding Bending is performed on the inner peripheral side.

  Further, the punch 53 having a substantially horizontal processing surface is used, and a shaping process is performed in which the processed plate on the upper surface portion 21c side is further bent and shaped so as to maintain the flat state of the lower surface portion 21d after molding. .

  Thereafter, using a punch 54 having an annular protrusion 54a on the processed surface, a compression step is performed in which a compression portion 21e is formed at a predetermined position of the upper surface portion 21c so as to maintain a flat state of the lower surface portion 21d after molding. A metal gasket 20 is configured.

  The protrusion 54a is preferably tapered in a cross-sectional shape toward the protruding end. At this time, the compression speed for compressing the metal material 21, that is, the lowering speed of the punch 54, the moving time of the filler 22 from the conditions such as the material and thickness of the metal material 21 and the material and thickness of the filler 22 is determined. It is more preferable to set in consideration. Thereby, the filling rate of the inner peripheral side filler 22a with respect to the inner peripheral side space part 23a when the filler 22 is divided | segmented into the inner peripheral side filler 22a and the outer peripheral side filler 22b can be made high.

  From this state, although not shown, the upper surface portion 21c and the lower surface portion 21d of the compression portion 21e are joined by YAG laser welding.

  As described above, in the metal gasket 20 according to the present embodiment, the internal space portion 23 is divided into the inner peripheral space portion 23a and the outer peripheral space portion 23b by forming the compression portion 21e in the metal material 21 in the compression step. Isolate. At the same time, in the metal gasket 20 in the present embodiment, the filler 22 is divided into the inner peripheral side filler 22a and the outer peripheral side filler 22b by forming the compression portion 21e in the metal material 21 in the compression step.

  Thereby, the filling rate of the inner peripheral side filler 22a in the inner peripheral side space part 23a located in the inner end 21a which is a target fluid side can be made high. At this time, the inner peripheral side filler 22a can be pushed out toward the inner end 21a by the inclined portion 21f formed by tapering the protruding end side of the protrusion 54a, and the filling rate of the inner peripheral side filler 22a Can be made higher. In the present embodiment, the filling rate of the inner circumferential side filler 22a in the inner circumferential side space 23a is 95% or more.

  Moreover, in the present embodiment, the compression portion 21e is formed by compressing and deforming only the upper surface portion 21c side while maintaining the flat state of the lower surface portion 21d, and the upper surface portion 21c and the lower surface portion 21d of the compression portion 21e. Are joined by YAG laser welding.

  Thereby, since the compression part 21e has isolate | separated the internal space part 23 into the inner peripheral side space part 23a and the outer peripheral side space part 23b, the stopper function with respect to the inner peripheral side filler 22a and the outer peripheral side filler 22b is provided. Can be provided.

  Therefore, even when the metal gasket 20 is used in a high temperature / high pressure environment, the inner peripheral filler 22a moves only inside the inner peripheral space 23a. It is possible to suppress the surface pressure from being lowered due to a large movement.

  In addition, the components (SOx, NOx) in the exhaust gas and the filler 22 chemically react, and it is possible to suppress a decrease in surface pressure due to deterioration of the metal gasket 20, that is, occurrence of sag.

(Second Embodiment)
By the way, in 1st Embodiment, as shown to FIG. 5 (A), one cyclic | annular filler 22 is used, and it divides | segments into the inner peripheral side filler 22a and the outer peripheral side filler 22b in a compression process. As described above, the metal gasket 20 of the present invention is not limited to this form.

  That is, in 2nd Embodiment, as shown to FIG. 5 (B), the filler 22 is divided into 2 with the inner peripheral side filler 22a and the outer peripheral side filler 22b previously, and the compression part 21e is formed. At this time, the filler 22 may be divided accurately. At this time, a portion to be divided 22c is formed between the inner peripheral side filler 22a and the outer peripheral side filler 22b.

  Therefore, it is preferable to arrange | position the part to be divided 22c in the position corresponding to the compression part 21e. Further, the separation distance W of the part to be divided 22c is preferably substantially equal to the protruding end width of the protruding part 54a. That is, as described above, in order to extrude the inner circumferential filler 22a toward the inner end 21a inside the inner circumferential space 23a by the cross-sectional shape of the protrusion 54a of the punch 54 in the compression process, the separation distance W Is preferably not wider than the protruding end width of the protrusion 54a.

  As shown in FIG. 5C, which is the third embodiment, a groove 22d may be formed in the filler 22, and the groove 22d may be used as a part to be divided. At this time, the shape, depth, and the like of the concave groove 22d can be appropriately set according to the filling rate of the inner circumferential side filler 22a with respect to the inner circumferential side space portion 23a.

  As described above, the metal gasket 20 according to the present invention includes an inner space portion surrounded by the metal material 21 in the metal gasket 20 including the filler 22 included in the inner space portion 23 surrounded by the metal material 21. 23, by compressing a part of the material including the filler 22 therein, and by providing a compression portion 21e in which a part of the metal material 21 and a part of the filler 22 are brought into contact with each other, the filler 22 is made of metal. The material 21 is divided into an inner peripheral filler 22a and an outer peripheral filler 22b from the inner end 21a to the outer end 21b.

  That is, by forming the compression part 21e in a part of the metal material 21, the volume of the internal space part 23 for covering the filler 22 is reduced, and the filling rate of the filler 22 with respect to the internal space part 23 is increased. Can do.

  Thus, it has the effect that it can reduce the volume of the gap in the internal space portion 23 due to insufficient filling of the filler 22 and can suppress the occurrence of sag, particularly in a high temperature or high pressure environment. It is useful for metal gaskets as a sealing material between two members.

  20 ... Metal gasket, 21 ... Metal material, 21c ... Upper surface part (one surface part), 21d ... Lower surface part (other surface part), 21e ... Compression part (recessed part), 22 ... Filler, 22a ... Inner peripheral side filler, 22b ... outer peripheral side filler, 23 ... inner space part (space), 23a ... inner peripheral side space part, 23b ... outer peripheral side space part

Claims (5)

In a metal gasket comprising a metal material and a filler contained in a space surrounded by the metal material,
It is characterized by comprising a concave part in which a part of the metal material and a part of the filler are brought into contact with each other by compressing a part of the space containing the filler in the space surrounded by the metal material. Metal gasket.   2. The metal gasket according to claim 1, wherein the filler is divided or divided into grooves at positions corresponding to the recesses.   3. The metal gasket according to claim 1, wherein the space is formed such that one side is a target fluid side with the concave portion as a boundary, and the concave portion is moved toward the target fluid side.   4. The metal gasket according to claim 3, wherein the recess is inclined so as to push out the filler toward the target fluid in the compression processing step.   The concave portion is formed by recessing one surface portion of the facing surface portion of the metal material toward the other surface portion, and joining the one surface portion and the other surface portion by laser welding. The metal gasket according to any one of the above.

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