JP4638334B2 - Metal laminated gasket - Google Patents

Description

  The present invention relates to a metal laminated gasket used mainly for a joint portion between members that require sealing properties such as a joint portion between an engine cylinder head and a cylinder block.

  Conventionally, for example, as a gasket to be used by interposing at the joint between the cylinder head and cylinder block of an engine, a plate made of a thin metal plate such as stainless steel as a base material, an upper plate disposed on the cylinder head side, A laminated gasket having a three-layer structure including an under plate arranged on the block side and an intermediate plate interposed between the two plates is known.

  In each plate constituting the gasket, in addition to the opening corresponding to the bore hole of the cylinder and the bolting bolt hole, the part required for securing the surface pressure at the time of tightening of the peripheral part of the opening Further, a bead having a cross-sectional mountain shape or a step shape is formed. Further, a rubber film layer may be provided on the plate as necessary in order to ensure a sealing property between the joint surface with the cylinder head and the block or between the plates.

  By the way, the gasket is configured by sequentially stacking the plates, but the plates have substantially the same shape. In particular, the upper plate and the under plate have almost the same shape. In this case, there is a possibility that the plates are mixed and combined, for example, the upper plate and the under plate are combined incorrectly. In addition, when the above-mentioned incorrect combination (hereinafter referred to as an incorrect combination) occurs, if it cannot be easily discriminated, there is a risk of impairing the sealing performance as a gasket by using the incorrect combination. . In particular, in the case of a gasket having a three-layer structure, once combined, there is a problem that it is impossible to confirm whether the intermediate plate is correct or not, whether the intermediate plate is bead-molded, or the like.

  For this reason, various structures have been proposed for facilitating identification of the upper and under plates constituting the gasket and discrimination of incorrect combinations.

  For example, in Patent Document 1 (Japanese Patent Laid-Open No. 11-270864), an identification bead portion that protrudes in the same direction as the bead portion is provided on one of an upper plate and an under plate constituting the gasket, and the upper plate and the under plate are provided. Proposals have been made so that the plates can be easily identified.

  However, in the proposed structure, in the case of a gasket having a three-layer structure including an intermediate plate, it is confirmed by checking whether the intermediate plate is correct and whether the intermediate plate is bead-molded in the combined state. This is not easy, and in particular, when the upper plate, the under plate, and the intermediate plate are made of the same material, it is difficult to distinguish them.

  Further, in Patent Document 2 (Japanese Utility Model Publication No. 2-37326), at least a part of each component plate in the metal laminated gasket is arranged in a stepped manner and exposed to the outside, thereby combining the component plates. What is made possible to determine the state, Patent Document 3 (Japanese Patent Publication No. 2-58501) also exposes at least a part of at least one side of each component plate in the metal laminated gasket, It shows what the combination state can be confirmed.

However, in any of these cases, even if it is a wrong combination, it can be combined without a sense of incongruity in operation, so sometimes it is transported to the next process in the wrong combination state, and a defective seal due to the wrong combination. May leak.
JP 11-270684 A Japanese Utility Model Publication 2-37326 Japanese Patent Publication No. 2-58501

  The present invention is basically a three-layer gasket having an upper plate, an under plate, and an intermediate plate. In order to solve the above-described problems in the combination of the plates, If these plates are used by mistake, they can be easily discriminated, and erroneous combinations can be prevented. Further, it is an object of the present invention to provide a metal laminated gasket capable of easily confirming and discriminating that bead molding for ensuring the surface pressure at the time of tightening is performed.

  The present invention is a metal laminated gasket that solves the above-mentioned problems, and includes an upper plate, an under plate, and an intermediate plate interposed between the two plates. Two types of identification beads projecting toward the opposite side are provided, and each of the upper plate and the under plate has a convex shape on the mating surface side of the two types of identification beads. A notch into which the identification bead can be fitted is provided at a position corresponding to the bead.

  According to the metal laminated gasket having the above-described configuration, when the plates are combined, the intermediate plate can be easily identified by the identification bead, and the upper plate and the under plate can be easily identified by the notches at different positions. Even in the state, depending on whether or not the positions of the notches of the upper plate and the under plate are in the regular positions, and whether or not the identification beads of the intermediate plate are in the regular positions with respect to the notches, Correctness can be discriminated.

  That is, in the normal combination state, the notch of the upper plate and the under plate is in a normal position, and the identification bead of the intermediate plate is fitted in the notch. Can be easily confirmed.

  When an error occurs in the combination of the plates, for example, when the intermediate plate is a regular one and one or both of the upper plate and the under plate are mistaken, the identification beads included in the intermediate plate are By deviating from the position of one or both of the notches on both of the underside plates and interfering with the plates, the overlay is not in a normal state and cannot be combined well. In addition, there is no identification bead for the intermediate plate in the notch of the misplaced plate. Therefore, it can be easily determined that the combination is incorrect.

  Further, when the upper plate and the under plate are regular and the intermediate plate is different, it can be easily determined in the same manner. In particular, in the above combined state, the presence or absence of an identification bead of the intermediate plate that will be fitted into the notch in the upper plate and the under plate is confirmed visually or by hand to check whether the intermediate plate is correct or incorrect. The presence or absence of molding can be easily confirmed and discriminated.

  That is, since the two types of identification beads of the intermediate plate are formed at the same time as the beads for securing the surface pressure formed on the intermediate plate, the presence or absence of the identification beads in the notch is confirmed. Thus, even in the combined state, it is possible to easily confirm that the bead for securing the surface pressure is formed on the intermediate plate and whether the intermediate plate is a proper one.

  In the metal laminated gasket, the two kinds of identification beads in the intermediate plate, and the corresponding notches in the upper plate and the under plate are separated from the beads formed in at least one of these plates. What is provided in is preferable. Thereby, the presence of the identification bead and the notch can be used without impairing the sealing performance as a gasket.

  Further, the two kinds of identification beads in the intermediate plate, and the corresponding notches in the upper plate and the under plate are provided so as to form an open shape outward in a part of the outer peripheral edge. In this case, the position of the identification bead, particularly whether or not the identification bead is in a proper position fitted into the notch, can be visually recognized from the side, and it becomes easier to determine a wrong combination.

  Even in the case where the intermediate plate is formed by superposing two thin metal plates, it is possible to easily discriminate and prevent erroneous combinations as described above.

  According to the metal laminated gasket of the present invention, in the case of basically a three-layer structure having an upper plate, an under plate, and an intermediate plate, when the plate is used incorrectly, the identification beat of the intermediate plate is the upper side. In addition, the correctness of each plate can be discriminated based on the position of the identification bead of the intermediate plate with respect to the notch of the upper plate and the under plate in the combined state. As a result, erroneous combinations can be prevented. In addition, it is possible to easily confirm and discriminate whether the intermediate plate is correct or incorrect and that the bead molding for securing the surface pressure at the time of tightening is performed on the intermediate plate in a state where the plates are combined. Therefore, it is possible to prevent the gasket product from flowing out which may cause a seal failure due to an incorrect combination of plates.

  Next, embodiments of the present invention will be described based on examples shown in the drawings.

  1 is a schematic perspective view of a metal laminated gasket according to an embodiment of the present invention, FIG. 2 is a schematic enlarged side view of a part of the same, FIG. 3 is an enlarged perspective view of the same part, and FIG. FIG. 5A to FIG. 5C are partial schematic plan views showing the upper plate, the under plate and the intermediate plate separately, and FIG. 6 is a part of the combined state of each plate. FIG.

  In the figure, reference numeral 1 denotes a metal laminated gasket according to the present invention which is used as a cylinder head gasket, for example, at a joint portion between a cylinder block and a cylinder head (not shown) of a multi-cylinder engine. The gasket 1 is a plate made of a metal thin plate such as stainless steel as a base material, an upper plate 2 disposed on the upper side, that is, the cylinder head side, an under plate 3 disposed on the lower side, that is, the cylinder block side, The intermediate plate 4 as a spacer interposed between the two plates 2.3 is combined to form a three-layer structure as shown in the figure. Usually, the upper plate 2, the under plate 3 and the intermediate plate 4 have basically the same shape or almost the same shape, and are fixed and integrated by means such as riveting or caulking at a required place. .

  As shown in the figure, the gasket 1 is formed with a through hole 1a for a bore hole and a through hole 1b for a tightening bolt at predetermined positions, penetrating the plates, and for cooling as required. A through hole (not shown) for liquid circulation is formed. Further, the upper plate 2 and the under plate 3 have a mountain shape or a step for securing a surface pressure during tightening so as to surround the through hole 1a for the bore hole and the through hole 1b for the tightening bolt, respectively. An inner bead 6 is formed, and an outer bead 7 similar to the above is formed outside the inner bead 6. The inner bead 6 and the outer bead 7 are formed so as to elastically contact the cylinder head with respect to the upper plate 2 and the cylinder block with respect to the under plate 3. The intermediate plate 4 is also formed with the same bead as described above for ensuring the surface pressure during tightening.

  In the structure of the gasket 1 having the three-layer structure, the intermediate plate 4 is opposite to each other at positions that do not affect the use as a gasket, such as outer peripheral edge portions and corner portions. Two types of identification beads 4a and 4b that are convex toward the side are provided. These identification beads 4a and 4b are formed by being press-molded so as to be convex on the opposite side simultaneously with the beads for securing the surface pressure in the intermediate plate 4.

  In the case of the figure, the identification beads 4a and 4b are formed in a convex shape consisting of a half portion of a truncated cone so as to form a laterally open shape at the outer peripheral edge of the intermediate plate 4, and the identification beads 4a and 4b. Is formed so that it can be seen from the side. The shape of the identification beads 4a and 4b can be a convex shape with various plane shapes such as a circle, an ellipse, a quadrangle, and other polygons, and any of them has a trapezoidal cross section.

  The positions where the two types of identification beads 4a and 4b are formed are positions away from the beads 6 and 7 for securing the surface pressure of each plate so as not to impair the sealing performance as a gasket. Although it can be arbitrarily set, it is particularly preferable to form it so that it is open at the side edge as shown in the figure from the viewpoint of visibility from the side, discriminability of each plate, correctness / incorrectness discrimination of the combined state, etc. preferable. The identification beads 4a and 4b may be provided at a plurality of locations.

  In the embodiment shown in the drawing, the intermediate plate 4 is provided with a notch 4c for identification other than the identification beads 4a and 4b at an outer peripheral edge at a position different from the identification beads 4a and 4b. Since the beads 4a and 4b can be used for identifying the intermediate plate 4, the notch 4c is not necessarily required.

  Of the two types of identification beads 4a and 4b at the different positions, the upper plate 2 and the under plate 3 are each one of the identification beads 4a that are convex on the mating surface side with the plate. Alternatively, notches 2a and 3a into which the identification beads 4a or 4b can be respectively fitted are provided at positions corresponding to 4b. That is, the notch 2a is provided in the upper plate 2 at a position corresponding to the identification bead 4a that is convex on the plate side, and the under plate 3 is convex on the mating surface side with the plate. The notch 3a is provided at a position corresponding to the identification bead 4b. Since the notches 2a and 3a of the upper and under plates 2 and 3 are located at different positions, they are also used for identifying the upper plate 2 and the under plate 3.

  The notches 2a and 3a basically have shapes corresponding to the planar shapes of the identification beads 4a and 4b, respectively, and are slightly larger than the identification beads 4a and 4b. The identification beads 4a and 4b It is formed so that it can be fitted. In the case of the figure, the outer peripheral edge of each plate is formed in a semicircular shape having an open shape at the side edge corresponding to the identification beads 4a and 4b, and is easily visible from the side. When the identification beads 4a and 4b are provided at a plurality of locations, the notches 2a and 3a are formed at a plurality of locations correspondingly.

  In addition to the case where the intermediate plate 4 is made of a single thin metal plate as shown in the figure, the two thin metal plates 41 and 42 are overlapped as shown in FIG. It is also possible to use a plate that is coupled and integrated by a fixed coupling means. In this case, the identification bead 4a is provided on the metal thin plate 41 on the upper plate 2 side, and the identification bead 4b is provided on the metal thin plate 42 on the under plate 3 side.

  According to the metal laminated gasket 1 of the present invention configured as described above, the intermediate plate 4 is identified by the identification beads 4a and 4b, and the upper plate 2 and the under plate 3 are located at different positions. It can be easily identified by the positions of the notches 2a and 3a. In particular, even in the combined state, whether or not the positions of the notches 2a and 3a of the upper plate 2 and the under plate 3 are normal positions, and the identification beads 4a of the intermediate plate 4 with respect to the notches 2a and 3a. , 4b can be determined whether each plate is correct or not.

  That is, in a proper combination of the upper plate 2, the intermediate plate 4 and the under plate 3, the identification bead 4 a provided on the upper side of the intermediate plate 4 is provided in the notch 2 a provided in the upper plate 2 and the The identification beads 4b on the side are stacked and combined in the notches 3a having the under plate 3 so as to be fitted respectively. In this combined state, the notches 2a and 3a of the upper plate 2 and the under plate 3 are in regular positions, and the identification beads 4a and 4b of the intermediate plate 4 are fitted into the notches 2a and 3a. Therefore, this can be easily confirmed by visual inspection or touch.

  When an error occurs in the combination, for example, when the intermediate plate 4 is a regular one, if one or both of the upper plate 2 and the under plate 3 are mistaken, the identification bead included in the intermediate plate 4 4a or 4b interferes with one or both of the upper side plate and the under side plate, and the superposition is not in a normal state, so that it cannot be combined well.

  For example, as shown in FIG. 8, when the under plate 3 'is arranged at the upper plate position, the identification bead 4a of the intermediate plate 4 is shifted from the notch 3a of the plate 3' arranged on the upper side. Will interfere with 3 'and cannot be combined into a normal state. Moreover, the identification beat 4a does not exist in the notch 3a of the plate 3 'arranged on the upper side in the combined state. Therefore, it can be easily determined that the upper plate 2 is a wrong combination. Even when the underplate 3 is mistaken, it can be easily determined that it is a wrong combination as described above.

  Further, when the upper plate 2 and the under plate 3 are regular and the intermediate plate 4 is different, it can be easily determined. In particular, in the above combined state, the presence or absence of the identification beads 4a or 4b of the intermediate plate 4 fitted in the notches 2a or 3a of the upper plate 2 and the under plate 3 can be easily observed visually or by hand. Thus, it is possible to easily check and determine whether or not the intermediate plate 4 is correct, whether the intermediate plate is correct, whether or not the bead molding is performed, and the like. Therefore, it is possible to prevent the incorrect combination of the plates.

  The metal laminated gasket of the present invention can be suitably used for a laminated gasket having a three-layer structure such as a cylinder head gasket used at a joint portion between members requiring sealing properties such as a joint portion between an engine cylinder head and a cylinder block. .

1 is a schematic perspective view of a metal laminated gasket according to an embodiment of the present invention. It is a one part schematic expanded side view same as the above. It is an expansion perspective view of the same part. It is an expanded sectional view of the previous figure IV-IV line. (A) (b) It is a partial schematic plan view which shows each upper plate, underplate, and intermediate | middle plate isolate | separated, respectively. It is a schematic plan view of a part of the combined state of each plate. It is a partial schematic expanded side view of the combination state which shows the metal lamination | stacking gasket of the other Example of this invention. It is explanatory drawing of the state of the incorrect combination of each plate.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Metal laminated gasket, 1a ... Through hole for bore hole, 1b ... Through hole for fastening bolt, 2 ... Upper plate, 2a ... Notch, 3 ... Under plate, 3a ... Notch, 4 ... Intermediate plate, 4a , 4b ... identification beads, 4c ... notches, 6 ... inner beads, 7 ... outer beads, 41, 42 ... thin metal plates.

Claims (5)

In a laminated gasket having an upper plate and an under plate, and an intermediate plate interposed between the two plates,
The intermediate plate is provided with two types of identification beads that protrude toward opposite sides at different positions, and the upper plate and the under plate each include the plate of the two types of identification beads. A metal laminated gasket characterized in that a notch into which the identification bead can be fitted is provided at a position corresponding to the identification bead that is convex on the mating surface side.   The metal laminated gasket according to claim 1, wherein the two kinds of identification beads in the intermediate plate are formed simultaneously with a bead for securing a surface pressure at the time of tightening formed in the intermediate plate.   The two types of identification beads in the intermediate plate and the corresponding notches in the upper plate and the under plate are provided at positions away from the beads formed in at least one of these plates. 3. A metal laminated gasket according to 1 or 2.   4. The two kinds of identification beads in the intermediate plate, and the corresponding notches in the upper plate and the under plate are provided so as to form an open shape outwardly at a part of the outer peripheral edge. Metal laminated gasket as described in 2. The metal laminated gasket according to any one of claims 1 to 4, wherein the intermediate plate is formed by superposing two thin metal plates.

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