JP4787343B2 - Metal gasket and method for manufacturing the same - Google Patents

Description

  The present invention relates to a metal gasket that sandwiches and seals between two members and a method for manufacturing the same, and more particularly, a pressing force sandwiching the gasket can be efficiently used for generating a seal surface pressure, and is excellent. The present invention relates to a metal gasket that can exhibit sealing performance and a method for manufacturing the same.

  Metal gaskets such as engine manifold gaskets are fastened by bolts in a state of being sandwiched between two members such as a cylinder block (cylinder body) of an automobile engine and an exhaust pipe or an intake pipe. Has the role of sealing the fluid.

  Recent engines are becoming smaller and lighter than conventional engines, and the material changes from cast iron to aluminum alloy, and the combustion gas pressure tends to increase as the engine output increases. . On the other hand, from the viewpoint of reducing the weight of the engine, the number of metal component plates that can be used for gaskets is decreasing, and it is necessary to exhibit high sealing performance with a small number of metal component plates.

  On the other hand, as one of the metal gaskets, in order to make the surface pressure around the cylinder hole uniform, the gasket base material is composed only of the first plate and the second plate, and the first plate is folded back in the direction of the second plate. A plurality of folded portions surrounding the cylinder hole are provided, a ring-shaped metal piece surrounding the cylinder hole 4 is accommodated in the folded portion, and a partial bead is provided at a portion between the cylinder holes of the metal piece. Metal laminated gaskets have been proposed (see, for example, Patent Document 1).

  In this metal laminated gasket, the surface pressure is adjusted by the plate thickness of the metal piece and the bead partially provided on the metal piece, so that the surface pressure around the cylinder hole is made uniform.

  Further, in order to continuously and gently distribute the surface pressure distribution generated in the circumferential direction of the cylinder hole, the reinforcing plate is composed of a metal substrate having a plurality of cylinder holes and provided with sealing means in the cylinder holes. In a laminated metal gasket, a surface pressure reinforcing plate that reinforces the surface against the sealing means is provided around a part of the cylinder hole, and the circumferential end of the cylinder hole of the surface pressure reinforcing plate is continuously inclined. A metal laminated gasket formed in (1) is proposed (for example, see Patent Document 2).

  In this metal laminate type gasket, the surface pressure distribution generated in the circumferential direction of the cylinder hole is continuously and gently distributed by forming the circumferential end of the surface pressure reinforcing plate of the metal piece with a continuous inclination. Yes.

  However, in these metal laminated gaskets, the metal pieces for adjusting the surface pressure and reinforcing the surface pressure are remarkably small parts compared to the metal components constituting the metal laminated gasket. In addition, there is a problem that the work efficiency is deteriorated because care is required for handling when assembling the gasket.

  Further, in metal processing, coining processing that can form a minute height difference on the surface of a metal is known, and the inventors have made a plate with or without a metal piece for adjusting the surface pressure or reinforcing the surface pressure. Instead of changing the thickness, it was considered effective to use a surface pressure adjusting portion in which irregularities were formed by coining.

  However, since only the peripheral part of the hole to be sealed needs to have a subtle change in plate thickness for adjusting the surface pressure, a relatively large metal component plate is used when performing coining on only this portion of the metal component plate. If the coining process is performed as it is, there is a problem that a large mold material is required, and handling during the coining process becomes troublesome, and the work efficiency at the time of manufacture deteriorates.

JP 9-310761 A Japanese Patent Laying-Open No. 2005-310761

  The present invention has been made in view of the above-described situation, and an object of the present invention is a range in which the height is greater than 0 μm and less than or equal to 100 μm over the entire circumference of the seal target hole at the peripheral portion of the seal target hole such as a cylinder bore. For metal gaskets with a structure that has an inflection that changes in the circumferential direction, a metal gasket that has a high degree of freedom in processing, can be easily tuned during processing, and can improve work efficiency is provided. There is to do.

Metal gasket of the present invention for achieving the above object, in the above two metal construction plate, around the seal object hole in at least one first metal structure plate, provided the pressure adjusting portion of the annular, An unevenness is formed in the circumferential direction of the seal target hole in the pressure adjusting portion, and the height difference of the unevenness is 0 μm.
and a ring-shaped member having the annular pressure adjusting portion is formed separately from an outer member of the ring-shaped member, and is joined to the ring-shaped member and the outer member. Te configured to handle as the first metal structure plate one, the first metal structure plate, laminated in the vicinity of the junction between the ring member and the outer member of at least the first metal formation plate And providing at least one second metal component plate, providing a folded portion on the second metal component plate, disposing the pressure adjusting portion inside the folded portion, and adjusting the pressure at the end of the folded portion. Arranged on the outer peripheral side of the joint, which is the outer periphery of the part.

  Moreover, in said metal gasket, it comprises so that the said ring-shaped member may have several sealing object holes. According to this structure, although the part used for the process for forming an unevenness | corrugation becomes larger than the ring-shaped member for every sealing object hole, the number of parts as a whole can be decreased.

Further, the metal gasket manufacturing method of the invention for achieving the above object is the method for manufacturing the metal gasket according to the above-mentioned metal gasket manufacturing method, wherein the annular pressure adjusting portion is coined to form the unevenness. The second metal component plate is joined to the first metal component plate so that it can be handled as a first metal component plate, and an end portion of the second metal component plate is folded to form a folded portion. It is the method characterized by arrange | positioning inside .

  In addition, although this ring-shaped member is formed in a circular shape along the sealing target hole on the inner peripheral side, the outer peripheral side does not necessarily need to be circular, a shape that is easy to handle during processing to form irregularities, or A shape convenient for joining to the metal component plate, for example, a square, a rectangle, a polygon, an ellipse, or the like may be used, or a shape having irregularities in plan view.

  For joining the ring-shaped member and the outer member, butt welding by laser, spot welding, rivet joining, etc. can be used, but if it can be prevented from moving in the circumferential direction of the hole to be sealed, A joining method such as fitting may be used.

  According to the metal gasket and the manufacturing method thereof of the present invention, since the ring-shaped member having the pressure adjusting portion arranged at the peripheral portion of the hole to be sealed is formed separately from the metal component plate, the metal component plate is separated. Thus, since the member having the annular pressure adjusting portion can be processed independently for forming the unevenness, the unevenness processing becomes easy. For example, when unevenness is formed by coining, since the processed portion is a smaller member than the entire metal component plate, the coining material can be small, and handling is facilitated, improving workability. Further, since the member to be processed becomes small, the degree of freedom of the coining amount is increased, and tuning during processing becomes easy.

  Furthermore, since the ring-shaped member having the pressure adjusting portion as a separate member is joined to the metal component plate so that it can be handled as one metal component plate, the size of the member to be handled when combined with other metal component plates Since they are substantially the same size, handling becomes easy and positioning is facilitated, so that the efficiency of the assembling work can be improved.

It is a fragmentary sectional view which shows the structure of the cylinder head gasket of the 1st Embodiment of this invention. It is a top view which shows the structure of the 1st metal component board of the cylinder head gasket of the 1st Embodiment of this invention. It is a top view which shows the structure of the cylinder head gasket of the 1st Embodiment of this invention. It is a fragmentary sectional view which shows the structure of the cylinder head gasket of the 2nd Embodiment of this invention.

  Next, an embodiment of a metal gasket and a manufacturing method thereof according to the present invention will be described with reference to the drawings, taking a cylinder head gasket as an example. However, the present invention is not limited to this cylinder head gasket, and can also be applied to an exhaust manifold gasket or other metal gaskets other than those used in engines. 1 to 3 are schematic explanatory diagrams, and in order to make the configuration easier to understand, the dimensions such as the plate thickness, the size of the hole to be sealed, and the size of the folded portion are the actual ones. Different and exaggerated.

  A metal gasket according to an embodiment of the present invention is a cylinder head gasket that is sandwiched between an engine member of an engine cylinder head and a cylinder block (cylinder body), and includes a high-temperature and high-pressure combustion gas in a cylinder bore, and The fluid such as cooling water and oil in the cooling water passage and cooling oil passage is sealed.

  This cylinder head gasket includes a plurality of metal component plates (metal substrates) formed of a mild steel plate, a stainless annealed material (annealed material), a stainless tempered material (spring steel plate), or the like. Further, it is manufactured in accordance with the shape of an engine member such as a cylinder block, and as shown in FIGS. 2 and 3, a cylinder bore hole (combustion chamber hole) 2, a water hole for cooling water (cooling water hole) 3. An oil hole 4 for circulating engine oil, a bolt hole 5 for fastening head bolts, and the like are formed.

  As shown in FIGS. 1-3, the cylinder head gasket 1 of 1st Embodiment which concerns on this invention is comprised by the 1st metal component board 10 and the 2nd metal component board 20, and is 1st metal. The component plate 10 includes a ring-shaped member 12 having an annular surface pressure adjusting portion 12a and an outer member 11 thereof. The second metal component plate 20 includes a bent portion 21 and a folded portion 22. is doing. The base member 11 and the second metal component plate 20 of the first metal component plate 10 are made of, for example, a stainless annealed material. On the other hand, the ring-shaped member 12 is formed of, for example, a spring steel plate.

  The ring-shaped member 12 is formed separately from the base member 11 of the first metal component plate 10, and in a separate state, on the surface that contacts the folded portion 22 of the second metal component plate 20 or on the opposite surface. An annular pressure adjusting portion 12a that is uneven in the circumferential direction is provided so that the height difference is in the range of 70 μm to 100 μm by coining. The pressure adjusting portion 12a is for uniformizing the surface pressure in the circumferential direction of the seal target hole 2, and is high in a portion adjacent to the adjacent seal target hole 2 and low in a portion near the bolt hole 5. .

  The ring-shaped member 12 having the irregularities is joined to the outer member 11 by butt welding, spot welding, or the like so as to be handled as a single metal component plate 10. In this case, for example, the first metal component plate 10 and the second metal component plate 20 are laminated at least in the peripheral portion of the joint portion 13 so that the pressure adjusting portion 12a of the ring-shaped member 12 can function, and the folded portion When 20 is formed, the plate thickness of the outer member 11 is made smaller than the plate thickness of the ring-shaped member 12 in the portion inside the end portion 23 of the folded portion 22.

  The pressure adjusting part 12a is placed inside the folded part 22 of the second metal component plate 20, and the end part 23 of the folded part 22 is arranged on the outer peripheral side of the joint part 13 which is the outer periphery of the pressure adjusting part 12a. Then, the first metal component plate 10 is laminated on the second metal component plate 20. After the lamination, the peripheral portion of the sealing target hole 2 of the second metal constituting plate 20 is bent by press working or the like to form the bent portion 21 and the folded portion 22. In addition, a necessary bead (not shown) or the like is formed during the press working.

  According to this cylinder head gasket 1, an annular pressure adjustment is formed around the cylinder bore hole 2 by coining or the like and has irregularities in the circumferential direction so that the height difference is in the range of 0 μm to 100 μm. The part 12a is arranged. In other words, dynamic inflections of 0 μm to 100 μm are continuously provided around the cylinder bore hole 2 along the circumferential direction. Therefore, the unevenness can equalize the surface pressure generated at the portion in contact with the second metal component plate 20 and the folded portion 22.

  Therefore, according to the cylinder gasket 1 and the manufacturing method thereof, the ring-shaped member 12 having the pressure adjusting portion 12a disposed at the peripheral edge portion of the cylinder bore hole 2 is separated from the member 11 outside the first metal component plate 10. Since the outer member 11 is separated and the ring-shaped member 12 can be processed independently for forming the unevenness, the uneven processing becomes easy. For example, when unevenness is formed by coining, the processed portion becomes a member that is remarkably smaller than the entire first metal component plate 10, so that the mold material for coining is small and handling is easy. , Workability is improved. Further, since the member to be processed becomes small, the degree of freedom of the coining amount is increased, and tuning during processing becomes easy.

  Furthermore, since the ring-shaped member 12 as a separate body is joined to the outer member 11 so that it can be handled as a single first metal component plate 10, a member to be handled when combined with another second metal component plate 20. Since the sizes are substantially the same, handling becomes easy and positioning and the like become easy, so that the efficiency of the assembling work can be improved.

  In the above description of the first embodiment, in order to simplify the description, only the structure of the pressure adjusting portion 12a and the folded portion 22 is used as the sealing means for the cylinder bore hole 2, but in practice, The pressure adjusting unit 12a can be used not only in the folded portion but in combination with a full bead, a half bead, a grommet, an intermediate plate, or the like.

  Therefore, regarding the plate thickness of the ring-shaped member 12 having the pressure adjusting portion 12 a and the plate thickness of the outer member 11, the pressure is not limited even if the plate thickness of the ring-shaped member 12 is not necessarily larger than the plate thickness of the outer member 11. Can perform the adjustment function. For example, when a full bead or a half bead abuts on the pressure adjusting unit 12a, the pressure adjusting function can be achieved even if the plate thickness of the ring-shaped member 12 is smaller or smaller than the plate thickness of the outer member 11. .

  For example, as in the cylinder head gasket 1A of the second embodiment of FIG. 4, the full bead 31 is in contact with the pressure adjusting portion 12a, and the plate thickness of the ring-shaped member 12 is smaller than the plate thickness of the outer member 11, but the pressure The adjustment unit 12a performs a pressure adjustment function.

  In this cylinder head gasket 1A, the first metal component plate 10 has a ring-shaped member 12 having an annular surface pressure adjusting portion 12a and a member 11 outside thereof, and the second metal component plate 20 is A bent portion 21 and a folded portion 22 are provided. This ring-shaped member 12 is formed in the same manner as in the first embodiment. The ring-shaped member 12 enters the inside of the folded portion 22 of the second metal constituting plate 20, and the end portion 23 of the folded portion 22 is arranged so as to be substantially the same as the joint portion 13 that is the outer periphery of the pressure adjusting portion 12a. Then, the first metal component plate 10 is laminated on the second metal component plate 20.

  In the cylinder head gasket 1A, a ring-shaped bead plate 30 having a bead 31 is disposed on the pressure adjusting portion 12a. The bead plate 30 is easier to handle if it is joined to the outer member 11, but may be placed on top without joining when deformed by welding or the like. The bead plate 30 is disposed on the opposite side of the folded portion 22 of the second metal component plate 20 together with the pressure adjusting portion 12a. In the cylinder head gasket 1 </ b> A, the intermediate plate 40 is further arranged on the outer peripheral side of the half bead 11 a of the outer member 11 and on the side opposite to the folded portion 22 of the second metal component plate 20. Further, the third metal component plate 50 is disposed so that the convex portion of the full bead 51 is in contact with the second metal component plate 20, and further, the convex portion of the full bead 61 is in contact with the folded portion 22 of the second metal component plate 20. A fourth metal component plate 60 is disposed. Further, the fourth metal component plate 60 has a half bead 62 on the outer peripheral side of the full bead 61.

  The full bead 51 of the third metal component plate 50, the full bead 31 of the bead plate 30, and the full bead 61 of the fourth metal component plate 60 are for cylinder bores so that their convex portions are positioned substantially the same in plan view. The hole 2 is arranged around the periphery. Further, the half beads 62 of the fourth metal component plate 62 are arranged so as to overlap the intermediate plate 40 in plan view.

  In the first and second embodiments described above, the ring-shaped member 12 is provided for each cylinder bore hole 2 that is a hole to be sealed. However, the ring-shaped member is configured to have a plurality of cylinder bore holes 2. Also good. This configuration is effective when the distance between the cylinder bore holes 2 is short, and according to this configuration, a ring-shaped member, which is a part used for processing for forming irregularities, is provided for each cylinder bore hole 2. However, the number of parts as a whole can be reduced.

  The metal gasket and the manufacturing method thereof according to the present invention are provided with an inflection that changes in the circumferential direction in the range of the height from 0 μm to 100 μm over the entire periphery of the hole to be sealed, such as a cylinder bore. A metal gasket having a structure has a high degree of freedom in processing amount during manufacture, can be easily tuned during processing, and can improve work efficiency. Therefore, a metal gasket such as a cylinder head gasket or a manifold gasket of an internal combustion engine and a manufacturing method thereof. Available as

1, 1A Cylinder head gasket (metal gasket)
2 Cylinder bore holes (holes to be sealed)
DESCRIPTION OF SYMBOLS 3 Water hole 4 Oil hole 5 Bolt hole 10 1st metal component board 11 Outer member 12 Ring-shaped member 12a Surface pressure adjustment part 20 2nd metal component board 21 Bending part 22 Folding part 23 End part of folding part

Claims (3)

Formed in two or more metal structure plate, around the seal object hole in at least one first metal structure plate, the pressure adjusting portion of the annular is provided, the unevenness of the pressure adjusting unit in the circumferential direction of the sealing hole to And forming the ring-shaped member having the annular pressure adjusting portion separately from the outer member of the ring-shaped member, wherein the height difference of the unevenness is in the range of 0 μm to 100 μm. And is configured to be handled as one first metal component plate by joining with the outer member ,
Providing at least one second metal component plate that is laminated in the vicinity of the joint between the first metal component plate and at least the ring-shaped member of the first metal component plate and the outer member;
The end portion of the second metal component plate is bent to form a folded portion, the pressure adjusting portion is disposed inside the folded portion, and the end portion of the folded portion is an outer periphery of the pressure adjusting portion. A metal gasket characterized by being arranged on the outer peripheral side of the joint .   The metal gasket according to claim 1, wherein the ring-shaped member is configured to have a plurality of sealing target holes. 3. The method for manufacturing a metal gasket according to claim 1, wherein the annular pressure adjusting portion is coined to form the unevenness, and then the first metal can be handled as one first metal component plate. 4. While joining with the component board ,
A method for producing a metal gasket , wherein an end portion of a second metal component plate is folded to form a folded portion, and the annular pressure adjusting portion is disposed inside the folded portion .

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