JP4360471B2 - Cylinder head gasket - Google Patents

Description

  The present invention relates to a cylinder head gasket that is sandwiched between two members such as a cylinder head and a cylinder block of an internal combustion engine and seals combustion gas and the like.

  In a cylinder head gasket that seals between a cylinder head and a cylinder block of an internal combustion engine, it is necessary to seal high-temperature and high-pressure combustion gas generated in the cylinder bore. Around the cylinder bore hole, a folded portion, a grommet, a bead In addition, a metal laminated gasket having excellent mechanical strength and durability in which a settling prevention member, a plate thickness adjusting member, and the like are arranged is used.

  As one of the cylinder head gaskets, the metal substrate (first surface plate) is folded around the cylinder bore hole around the cylinder bore hole so as not to enter between the stacked metal substrates. An annular (ring-shaped) bead plate (bead plate: intermediate plate) having a bead (inner peripheral side bead) for sealing the cylinder bore hole is disposed in the folded portion, and the plate thickness A cylinder head gasket in which an adjustment metal substrate (second surface plate) is arranged has been proposed (for example, see Patent Document 1).

  In this cylinder head gasket, the seal surface pressure is increased by a bead (inner circumference side bead) provided on the bead plate to form a seal line around the cylinder bore hole, and a metal substrate for adjusting the plate thickness (Table 2). (Face plate) is arranged to increase the thickness in the folded portion. By increasing the curvature of the bent portion of the folded portion by increasing the thickness, the occurrence of cracks in the bent portion is prevented.

  However, the bead plate of the prior art is a single-plate component formed in an annular shape, and the plate thickness is relatively thin, about 0.2 mm, depending on the type of cylinder head gasket. Is relatively small. For this reason, there is a problem in that careful handling is required and it is necessary to arrange the cylinder bore hole accurately at the peripheral edge.

In addition, when an anti-sticking plate or a plate thickness adjusting plate is arranged around the bead of the bead plate, it is necessary to accurately arrange these parts in the folded portion of the peripheral edge of the cylinder bore hole. There is a problem that a high assembly technique is required. Therefore, in the prior art, the anti-sticking plate for preventing bead settling is not arranged, and the plate thickness is often adjusted by inserting the surface plate (metal substrate) into the folded portion. It was one of the causes of increase in weight and weight.
JP 2003-139247 A

  The present invention has been made to solve the above-described problems, and an object of the present invention is to prevent an annular bead member disposed in a folded portion of a peripheral portion of a cylinder bore hole in a cylinder head gasket from being sticky. Cylinder head that can achieve good sealing performance by reducing the number of parts during assembly by reducing the number of parts during assembly by simplifying the assembly work by adopting a laminated structure with members, plate thickness adjustment members, etc. It is to provide a gasket.

In order to achieve the above object, a cylinder head gasket according to the present invention is sandwiched between a cylinder head and a cylinder block of an internal combustion engine to exhibit a sealing function, and has a metal substrate and a peripheral edge of a cylinder bore hole in the metal substrate. In the cylinder head gasket configured to include an annular bead member disposed in the folded portion of the part, the annular bead member and the annular settling prevention member, the plate thickness adjusting member, or the bead plate are integrated. It is composed of a laminated structure formed by

  In the prior art, an annular bead member in which a bead is simply provided on a single plate is provided in this bead member by adopting a laminated structure with a settling prevention member, a plate thickness adjusting member, etc. in the present invention. In addition to the function of sealing the bead, it is possible to provide functions such as prevention of settling of the bead and adjustment of the plate thickness at the portion where the bead member is disposed.

  In addition, since this bead member is an annular shape disposed only in the vicinity of the cylinder bore hole, the size of the parts is small and the rigidity is relatively small compared to other metal substrates having a large area. It is easy to deform and care was required for handling, but because it has a laminated structure, it is integrated by bonding etc. before assembling each metal substrate, or integrated lamination by processing plates previously laminated with adhesive etc. With the structure, the number of parts is reduced, the rigidity is increased, and handling is facilitated. Therefore, the assembling work is facilitated and positioning can be performed more accurately.

In the above cylinder head gasket, the annular bead member is formed by bending the bead member on one or both of the inner peripheral side and the outer peripheral side of the bead provided on the bead member, or If an annular settling prevention member integrated with the bead member is disposed, a settling prevention member such as a shim is provided on one side or both sides of the bead of the bead member, so that a large pressing force is applied to the bead. However, the anti-sticking member can bear the pressing force and prevent the bead from being flattened. For this reason, it is possible to prevent the beads from becoming loose and to improve the durability of the gasket.

In the above cylinder head gasket, the annular bead member is formed by bending the bead member on the concave side of the bead provided on the bead member, or a circle integrated with the bead member. If an annular plate thickness adjusting member is provided and formed, this configuration allows the plate thickness adjusting member to be disposed on the concave side of the bead, so that one bead member has both a sealing function and a plate thickness adjusting function. It will be. In the prior art, this metal thickness adjustment uses another metal substrate that is different from the metal substrate having the folded portion and the bead member. Therefore, in the present invention, the number of parts can be reduced and the weight can be reduced. .

In the above cylinder head gasket, the annular bead member is formed on both sides of the front and back by bending the bead member to be outwardly convex, or the annular bead having an outwardly convex bead. When the plates are integrated and formed, two beads can be provided by one bead member by this configuration, so that a strong seal line can be formed. These beads can generate a strong surface pressure when they are formed so as to overlap each other, and a double seal line can be formed when they are formed so as not to overlap each other.

  In the cylinder head gasket, when the bead member is formed in a laminated structure by folding a single plate, the plates constituting the laminated structure do not fall apart, so that handling becomes very simple. Further, since the positioning between the members in the laminated structure is not necessary, the workability is remarkably improved.

  According to the cylinder head gasket of the present invention, since the bead member disposed in the folded portion at the peripheral edge of the cylinder bore is formed in a laminated structure, in addition to the bead sealing performance, the surface pressure adjustment and plate of each laminated portion The effects such as thickness adjustment can be exhibited, and the weight can be reduced. Further, when the laminated structure of the bead members is integrated before assembling, the number of parts at the time of assembling is reduced and the rigidity of the bead members is increased, so that the assembling work can be simplified and the manufacturing cost can be kept low.

  Further, if the laminated structure of the bead members is formed by folding a single plate, positioning during the lamination of the bead members is not necessary, so that the workability is remarkably improved.

  Next, a cylinder head gasket according to an embodiment of the present invention will be described with reference to the drawings. 1 to 11 are schematic explanatory diagrams, and for easy understanding, the plate thickness, bead size, and aspect ratio of each metal substrate are displayed differently from the actual ones.

  As shown in FIGS. 1 to 8, cylinder head gaskets 1 </ b> A to 1 </ b> H according to an embodiment of the present invention are sandwiched between a cylinder head of an engine (internal combustion engine) and a cylinder block (cylinder body), and combustion gas It is a gasket that seals cooling water and lubricating oil.

  The cylinder head gaskets 1A to 1H include a first metal substrate (first surface plate) 10, a second metal substrate (second surface plate) 20, bead members 30A to 30H, and an intermediate plate 40 (, 50). Composed. The first metal substrate (first surface plate) 10 and the second metal substrate (second surface plate) 20 are formed of a mild steel plate or stainless annealed material, which is a relatively soft and easy-to-fit material, and bead members 30A to 30A to 30B. 30H and the intermediate plate 40 (, 50) are formed of a hard and relatively strong spring steel plate (spring steel plate) or the like.

  At the peripheral edge portion of the cylinder bore hole 2 of the first surface plate 10, a folded portion (flange portion) 12 is provided through the bent portion 11 by folding back to the second surface plate 20 side. Annular bead members 30 </ b> A to 30 </ b> H having bead (full beads) 31 (, 35) and a laminated structure inside the first folded portion 12, that is, between the folded portion 12 and the first surface plate 10. And a bead 31 (, 35) provided in the bead members 30 </ b> A to 30 </ b> H forms a seal line having a high seal surface pressure around the cylinder bore hole 2.

  On the other hand, a second metal substrate 20 having an inner peripheral edge is disposed on the outer peripheral side of the folded portion 12 of the first metal substrate 10. An intermediate plate 40 (, 50) having a half bead 41 (, 51) is disposed between the second metal substrate 20 and the first metal substrate 10. As a result, the surface of the first metal substrate 10 on the side of the folded portion 12 and the surface of the second metal substrate 20 are brought to substantially the same level on the side in contact with the cylinder head or the cylinder block. The half bead 41 (, 51) includes a first flat part surrounding the outer peripheral side of the bead members 30A to 30H, a slope part adjacent to the outer peripheral side of the first flat part, and a first flat part adjacent to the outer peripheral side of the slope part. Two flat portions are formed.

  As shown in FIGS. 1 to 3, in the cylinder head gaskets 1 </ b> A to 1 </ b> C according to the first embodiment, the bead members 30 </ b> A to 30 </ b> C are plate-like on both sides, the inner peripheral side, or the outer peripheral side of the bead 31. The anti-sticking members 32 and 33 are provided and formed. The settling prevention members 32 and 33 share the pressing force applied to the bead 31 when a large pressing force is applied and the bead 31 is greatly deformed, thereby preventing the bead from being flattened. Thereby, since the settling of the bead 31 can be prevented, durability of the cylinder head gaskets 1A to 1C can be improved.

  1 to 3, the laminated structure is formed by folding back one or both of the inner peripheral side and the outer peripheral side of one annular bead member 30A to 30C. As described above, the anti-sticking plates (surface pressure adjusting plates) 32 ′ and 33 ′ may be formed separately from the plates 30A ′ to 30C ′ of the beads 31 and stacked to form a stacked structure. In this case, before assembling the cylinder head gaskets 1A to 1C, the anti-sticking plates 32 'and 33' and the plates 30A 'to 30C' having the beads 31 are attached and integrated with an adhesive or the like, and the bead members 30A to 30A are integrated. It is preferable that 30C has a laminated structure from the viewpoint of reducing the number of components, the positioning accuracy, the workability, and the like.

  Next, a second embodiment will be described. In the cylinder head gaskets 1D to 1F of the second embodiment, a plate thickness adjusting member 34 that is a flat portion is provided on the concave side of the bead 31 to form the bead members 30D to 30F. The plate thickness adjusting member 34 is formed by folding the outer peripheral side of the bead member 30D as shown in FIG. 4, or is formed by folding the inner peripheral side of the bead member 30E as shown in FIG. Further, as shown in FIG. 6, the bead member 30 </ b> F may be formed by further having a settling prevention member 32.

  4 to 6, the plate thickness adjusting member 34 is formed by folding back one or both of the inner peripheral side and the outer peripheral side of one annular bead member. It is good also as a laminated structure (not shown) by forming these by the board | plate separate from the board of the bead 31, etc., and laminating | stacking these. In this case, before assembling the cylinder head gaskets 1D to 1F, the separate plate thickness adjusting member 34 and the plate having the beads 31 are attached and integrated with an adhesive or the like, and the bead members 30D to 30F are laminated. It is preferable to keep the number of parts from the viewpoint of reducing the number of parts.

  Next, a third embodiment will be described. As shown in FIG. 7, in the cylinder head gasket 1G of the third embodiment, bead members 30 and 35 are provided on both sides of the front and back sides to form a bead member 30G. In the case of this configuration, since one bead member 30G is provided with two beads protruding outward, a stronger seal line can be formed. As shown in FIGS. 7 and 8, these beads can generate a strong seal surface pressure when they are formed so as to overlap each other, and although not shown, if they are formed so as not to overlap each other, a double seal line is formed. Can be formed. Although not shown in the drawing, if the structure provided with the anti-sticking members 31 and 32 of FIGS. 1 to 3 is added, the function and effect of the anti-sticking members 31 and 32 can be exhibited at the same time.

  In FIG. 7, these beads 31 and 35 are formed by folding the outer peripheral side of one annular bead member, but may be formed by folding the inner peripheral side, or the second bead. It is good also as a laminated structure (not shown) by forming 35 by the board different from the board of the bead 31, and laminating | stacking these. In this case, before assembling the cylinder head gasket 1G, the separate plate having the second bead 35 and the plate having the bead 31 are attached and integrated with an adhesive or the like, so that the bead member 30G has a laminated structure. It is preferable to reduce the number of parts.

  Next, a fourth embodiment will be described. As shown in FIG. 8, the cylinder head gasket 1H according to the fourth embodiment is provided with beads 31 and 35 protruding outward on both sides of the front and back, and a flat portion between the beads 31 and 35. The plate thickness adjusting member 34 is provided to form the bead member 30H. In the case of this configuration, since one bead member 30H is provided with two beads 31 and 35 protruding outward, a stronger seal line can be formed, and the plate thickness adjusting member 34 can be used to form the cylinder head gasket 1H. The plate thickness can be adjusted.

  In addition, when the beads 31 and 35 are provided on both sides of the front and back in this way, the overall plate thickness of the cylinder head gasket 1H increases, so that the intermediate plate 50 having the half beads 51 is replaced with the intermediate plate 40 and the second surface plate 20. Arrange between them to adjust the thickness of this part. Although not shown in the drawing, if the structure provided with the anti-sticking members 32 and 33 of FIGS. 1 to 3 is added, the function and effect of the anti-sticking members 32 and 33 can be exhibited at the same time.

  The bead member 30H having this laminated structure is provided with the beads 31 and 35 that protrude outward after being folded on the inner peripheral side and the outer peripheral side of the flat portion serving as the plate thickness adjusting member, and are folded and stacked on opposite surfaces. By doing so, it can be formed. Alternatively, the second bead 35, the plate thickness adjusting member 34, and the plate of the bead 31 may be formed of different plates and stacked to form a stacked structure (not shown). In this case, before assembling the cylinder head gasket 1H, the plate having the separate second bead 35, the plate serving as the plate thickness adjusting portion 34, and the plate having the bead 31 are attached to each other with an adhesive or the like. It is preferable that the bead member 30H has a laminated structure in view of reducing the number of parts.

  According to the cylinder head gaskets 1A to 1H of the first to third embodiments having the above-described structure, in the prior art, a single-plate annular bead member simply provided with a bead is used in the present invention. By adopting a laminated structure, in addition to the sealing function of the beads, it is possible to have a function of preventing the beads from sticking and a function of adjusting the thickness of the gasket.

  In addition, if a plurality of plate-like members are integrated into one bead member by bonding or the like before combining the metal substrates, the laminated structure of the bead member can be handled easily because the rigidity is increased. Furthermore, since the number of parts is reduced, assembly becomes easy. Further, when a single-plate is folded to form a bead member having a laminated structure, it is easier to handle because it is not separated.

  Although the specific dimensions of these cylinder head gaskets 1A to 1H differ depending on the engine, for example, the plate thicknesses of the first metal substrate 10 and the second metal substrate 20 are about 0.2 to 0.8 mm and about 0.2 mm, respectively. The thickness of one sheet when the bead members 30A to 30H are formed in a folded structure and the thickness of the intermediate plate 40 (, 50) are about 0.2 to 0.4 mm, respectively. It is about 0.2 to 0.4 mm. Moreover, although the height of the beads 31 and 35 and the half beads 41 and 51 is about 0.1 to 0.5 mm, the shape of the beads 31 and 35 and the half beads 41 and 51 depends on factors such as the pressure of the combustion gas to be sealed. The dimensions and dimensions are designed so as to obtain appropriate seal surface pressure and durability.

It is a fragmentary sectional view which shows the structure of the peripheral part of the hole for cylinder bores of the cylinder head gasket of 1st Embodiment which concerns on this invention. It is a fragmentary sectional view showing other composition of the peripheral part of the hole for cylinder bores of the cylinder head gasket of a 1st embodiment concerning the present invention. It is a fragmentary sectional view showing other composition of the peripheral part of the hole for cylinder bores of the cylinder head gasket of a 1st embodiment concerning the present invention. It is a fragmentary sectional view which shows the structure of the peripheral part of the hole for cylinder bores of the cylinder head gasket of 2nd Embodiment which concerns on this invention. It is a fragmentary sectional view showing other composition of the peripheral part of the hole for cylinder bores of the cylinder head gasket of a 2nd embodiment concerning the present invention. It is a fragmentary sectional view showing other composition of the peripheral part of the hole for cylinder bores of the cylinder head gasket of a 1st embodiment concerning the present invention. It is a fragmentary sectional view which shows the structure of the peripheral part of the hole for cylinder bores of the cylinder head gasket of 3rd Embodiment which concerns on this invention. It is a fragmentary sectional view which shows the structure of the peripheral part of the hole for cylinder bores of the cylinder head gasket of 4th Embodiment which concerns on this invention. It is sectional drawing which shows the other laminated structure of the bead member of the cylinder head gasket of 1st Embodiment which concerns on this invention. It is sectional drawing which shows the other laminated structure of the bead member of the cylinder head gasket of 1st Embodiment which concerns on this invention. It is sectional drawing which shows the other laminated structure of the bead member of the cylinder head gasket of 1st Embodiment which concerns on this invention.

Explanation of symbols

1A to 1H Cylinder head gasket 2 Cylinder bore hole 11 Bending part 12 Folding part (flange part)
10 First metal substrate (first surface plate)
20 Second metal substrate (second surface plate)
30A-30H Bead member 31, 35 Bead 32, 33 Sticking prevention member (surface pressure adjusting member)
32 ', 33' Anti-sticking plate (surface pressure adjusting plate)
34 Plate thickness adjusting member 40, 50 Intermediate plate 41, 51 Half bead

Claims (5)

It is sandwiched between a cylinder head and a cylinder block of an internal combustion engine and exhibits a sealing function, and has a metal substrate and an annular bead member disposed in a folded portion of a peripheral edge of a cylinder bore hole of the metal substrate. A cylinder head gasket comprising a laminated structure in which the annular bead member and an annular settling prevention member, a plate thickness adjusting member, or a bead plate are integrally formed.   The annular bead member is formed by bending the bead member on one or both of the inner peripheral side and the outer peripheral side of the bead provided on the bead member, or integrated with the bead member. The cylinder head gasket according to claim 1, wherein the cylinder head gasket is formed by disposing an annular settling prevention member.   A plate thickness adjusting member formed by bending the bead member on the concave side of the bead provided on the bead member, or an annular plate thickness adjusting member integrated with the bead member. The cylinder head gasket according to claim 1 or 2, wherein the cylinder head gasket is disposed.   The annular bead member is formed on both sides of the front and back by bending the bead member to be outwardly convex, or formed by integrating an annular bead plate having an outwardly convex bead. The cylinder head gasket according to any one of claims 1 to 3.   The cylinder head gasket according to any one of claims 1 to 4, wherein a grommet is used instead of the folded portion.

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