JP5060080B2 - Metal cylinder head gasket - Google Patents

Description

  The present invention relates to a metal cylinder head gasket that is interposed between a cylinder block and a cylinder head and seals between the opposing surfaces of the cylinder block and the cylinder head. This relates to a measure for ensuring a water sealing property between a water jacket that opens on at least one of the opposing surfaces of the gas and a combustion chamber hole.

  In general, a metal cylinder head gasket is formed by integrally laminating at least three or more gasket substrates on top and bottom, and a plurality of combustion chamber holes formed in a required position of the laminate in accordance with the position of the cylinder bore. Is provided.

As shown in FIG. 6, conventionally, in order to ensure the sealing performance in the vicinity of the combustion chamber hole f, the periphery of the combustion chamber hole f of the upper and lower gasket substrates b and c located on both the upper and lower sides is provided. And full bead portions b1 and c1 that bulge so that the top portions b1a and c1a face each other at positions facing each other in the vertical direction, and are interposed between the upper and lower gasket substrates b and c and In the peripheral edge of the combustion chamber hole f of the intermediate gasket substrate d located closer to the combustion chamber hole f than the full bead parts b1 and c1, there is provided a folded part d1 that is turned back radially outward of the combustion chamber hole f. Is known (see, for example, Patent Document 1).

However, in the above conventional one, the folded portion d1 of the metal cylinder head gasket a ( intermediate gasket substrate d) applies a high surface pressure between the opposing surfaces of the cylinder block e1 and the cylinder head e0. Although advantageous, it serves as a stopper to prevent over-compression of the full bead portions b1 and c1 of the upper and lower gasket substrates b and c, so that the upper and lower gaskets are assembled when the cylinder block e1 and the cylinder head e0 are assembled. The full bead portions b1 and c1 of the substrates b and c may not be completely compressed. In this, the peripheral edges of the water jackets g1 and g2 that open to at least one of the opposing surfaces of the cylinder block e1 and the cylinder head e0 (the opposing surfaces of both the cylinder block e1 and the cylinder head e0 in FIG. 6 ), Since there is a possibility that a gap may be formed between the full bead portions b1 and c1 of the upper and lower gasket substrates b and c, the coolant enters the combustion chamber hole f side from the peripheral edge of the water jackets g1 and g2, and the full beads The coolant reaches the vicinity of the portions b1 and c1, and the crevice corrosion occurs in the cylinder block e1 and the cylinder head e0 due to the cooling water reaching the vicinity of the full bead portions b1 and c1. When the cooling water reaches the vicinity of the full bead portions b1 and c1, the cooling water boils by receiving heat from the cylinder block e1 and the cylinder head e0, and is coated on the upper and lower surfaces of the upper and lower gasket substrates b and c. It may become a factor which peels off the rubber | gum and reduces sealing performance.

Therefore, by thinning the thickness of the intermediate gasket substrate, to suppress the stopper specific role of over-compression prevention of full-bead portion by the folded portion, it is conceivable to allow complete compression of the full bead portion, an intermediate gasket base If the plate thickness is reduced, the folded portion may be cracked, or when the folded portion is formed, the warp of the intermediate gasket substrate may increase and the product may not be handled.

The present invention has been made in view of such points, and the object of the present invention is to prevent crevice corrosion of the cylinder block and the cylinder head and the upper and lower gasket substrates without reducing the thickness of the intermediate gasket substrate. An object of the present invention is to provide a metal cylinder head gasket that can surely prevent deterioration in sealing performance due to peeling of rubber.

In order to achieve the above object, in the present invention, a metal that is interposed between a cylinder block and a cylinder head configured in an open deck type and seals between the opposing surfaces of the cylinder block and the cylinder head. An upper gasket substrate that is located on the cylinder head side and closes the opening of the water jacket of the cylinder head, and is located on the cylinder block side and that is open on the water jacket of the cylinder block. Each of the gaskets, and a lower gasket substrate that closes the gasket, and an intermediate gasket substrate that is interposed between the gasket substrates and disposed at a position that closes the opening of the water jacket of the cylinder head and the cylinder block. Laminate substrates vertically Formed in, the required portion of the laminate, comprising a plurality of combustion chamber holes drilled in accordance with the position of the cylinder bore opening to opposite faces of the cylinder block. Further, in the upper and lower gasket substrates , a full bead portion is provided on the combustion chamber hole side from the position facing the opening of the water jacket so as to swell so that the top portions face each other in the vertical direction. A folded portion that is folded back outward in the radial direction of the combustion chamber hole is provided at the peripheral edge portion of the combustion chamber hole of the intermediate gasket substrate located on the combustion chamber hole side of the full bead portion of the upper and lower gasket substrates. A shim is mounted between the folded end of the folded portion of the intermediate gasket substrate and the opening of the water jacket opened on at least one of the opposed surfaces of the cylinder block and the cylinder head. Then, the anti-combustion chamber hole side end of the shim is set to the bore side opening edge position of the water jacket or the position beyond the bore side opening edge of the water jacket and not reaching the anti-bore side opening edge.

Due to this specific matter, when the cylinder block and cylinder head are assembled, the upper and lower gasket substrates are folded by the folded portion of the intermediate gasket substrate that acts as a stopper to prevent over-compression of the full bead portions of the upper and lower gasket substrates. even full bead portion not be fully compressed, the loaded shim between the apertures of the water jacket which is open on at least one of the opposing surfaces of the folded end and the cylinder block and the cylinder head of the folded portion of the intermediate gasket base The surface pressure between the opposed surfaces of the cylinder block and the cylinder head between the opening end of the water jacket and the full bead portions of the upper and lower gasket substrates is ensured to prevent the generation of a gap. As a result, the cooling water does not enter the vicinity of the full bead portion from the periphery of the water jacket, and it is possible to reliably prevent crevice corrosion between the cylinder block and the cylinder head due to the cooling water, and in the vicinity of the full bead portion. It is possible to prevent the rubber from being peeled off from the upper and lower gasket substrates due to the boiling of the cooling water and to reliably prevent the sealing performance from being lowered.

Moreover, since the thickness of the intermediate gasket substrate is not reduced, the folded portion does not crack, and when the folded portion is formed, the intermediate gasket substrate does not warp and can be handled smoothly as a product. Will be kept in a state.

Further, the shim may be disposed between the anti-combustion chamber hole side end of the full bead portion and the bore side opening edge position of the water jacket , or the anti-combustion chamber hole side end of the full bead portion and the bore of the water jacket. When the cylinder block and the cylinder head are assembled, the excess of the full bead portion of the upper and lower gasket substrates is exceeded when the cylinder block and cylinder head are installed. Even if the full bead portions of the upper and lower gasket substrates are not completely compressed by the folded portion of the intermediate gasket substrate that acts as a stopper to prevent compression, the end of the anti-combustion chamber hole side of the full bead portion and the opening of the water jacket Cylinder block between the anti-combustion chamber hole side end of the full bead portion and the open end of the water jacket by a shim mounted between the ends Mutual facing surface surface pressure between the cylinder head and the generation of secured a gap is prevented. As a result, the cooling water does not enter the vicinity of the full bead portion from the periphery of the water jacket, and the upper and lower gaskets due to the crevice corrosion of the cylinder block and the cylinder head due to the cooling water and the boiling of the cooling water near the full bead portion. It is possible to prevent the rubber from peeling off from the substrate and reliably prevent the sealing performance from being lowered.

  Further, the shim is interposed between the folded side surface of the intermediate gasket substrate folded by the folded portion and the intermediate gasket substrate side surface of the upper or lower gasket substrate facing the folded side surface of the intermediate gasket substrate. If the intermediate gasket substrate is interposed between the anti-folding side surface of the intermediate gasket substrate and the intermediate gasket substrate side surface of the upper or lower gasket substrate facing the anti-folding side surface of the intermediate gasket substrate, Cylinder block and cylinder head are opposed to each other by shim between the end of the anti-combustion chamber hole of the full bead portion and the open end of the water jacket. It becomes possible to ensure the mutual surface pressure effectively.

In short, by attaching a shim between the folded end of the folded portion of the intermediate gasket substrate and the open end of the water jacket that opens on at least one of the opposing surfaces of the cylinder block and the cylinder head, the open end of the water jacket Cooling water from the peripheral edge of the water jacket to the vicinity of the full bead portion is secured by ensuring the surface pressure between the opposing surfaces of the cylinder block and the cylinder head between the full bead portion of the upper and lower gasket substrates. Can be prevented, and the deterioration of the sealing performance due to the crevice corrosion of the cylinder block and the cylinder head and the peeling of the rubber from the upper and lower gasket substrates can be surely prevented. Moreover, it is not necessary to reduce the thickness of the intermediate gasket substrate, cracks and the folded portion, to eliminate the warpage of the intermediate gasket base when forming the folded portion, it is possible to keep the handled smoothly as products.

  Hereinafter, a cylinder head gasket for one bank of a V-type 6-cylinder engine as an internal combustion engine to which a gasket structure according to an embodiment of the present invention is applied will be described with reference to the drawings.

  1 and 2 show a cylinder head gasket (metal cylinder head gasket) for one bank of a V-type 6-cylinder engine. As shown in FIG. 2, an engine E to which this cylinder head gasket 1 is applied is shown. The cylinder block E1 of one bank has three through holes E2 (only one is shown in FIG. 2) corresponding to the number of pistons, and a cylindrical cylinder liner E3 is formed in each through hole E2. Each is press-fitted. That is, the engine E to which the cylinder head gasket 1 of the present embodiment is applied is based on the assumption that the cylinder bore E4 is constituted by the inside of the cylinder liner E3. Since the other bank of engine E has the same configuration, only one bank will be described.

  The cylinder block E1 is configured as an open deck type. In other words, the water jacket 21 is formed in the cylinder block E1 so as to surround substantially the entire circumference of each cylinder bore E4, and the water jacket 21 opens on the top surface (side surface of the cylinder head E0) of the cylinder block E1. In addition, a water jacket 22 is formed in the cylinder head E0 so as to surround substantially the entire circumference of each combustion chamber, and the water jacket 22 opens on the lower surface (side surface of the cylinder block E1) of the cylinder head E0. In this case, the water jacket 21 of the cylinder block E1 and the water jacket 22 of the cylinder head E0 correspond to each other so that the openings face each other at positions facing each other in the vertical direction.

  The cylinder head gasket 1 is interposed between the cylinder block E1 and the cylinder head E0. As is well known, the lower cylinder block E1 and the upper cylinder head E0 are integrally connected by a fastening bolt. Thus, the openings of the water jackets 21 and 22 are sealed by being sandwiched between the opposing surfaces of the cylinder block E1 and the cylinder head E0. The cylinder head gasket 1 includes an upper gasket substrate 11 located on the cylinder head E0 side (upper surface side in FIG. 2), a lower gasket substrate 12 located on the cylinder block E1 side (lower surface side in FIG. 2), and both And an intermediate gasket substrate 13 interposed between the gasket substrates 11 and 12. And each said gasket board | substrate 11-13 is integrally connected mutually by the conventionally well-known connection means (for example, lance lock etc.) with the shim 14 mentioned later, and comprises the laminated body (cylinder head gasket 1). As shown in FIG. 1, three combustion chamber holes 15, 15, 15 drilled in accordance with the position of the cylinder bore E <b> 4 are provided at a required portion of the cylinder head gasket 1. Further, the upper and lower gasket substrates 11 and 12 are coated with rubber having a thickness of about 25 μm on the upper and lower surfaces, respectively, so that the upper and lower surfaces of the upper and lower gasket substrates 11 and 12 are sealed with rubber. It has come to be demonstrated.

  The upper and lower gasket substrates 11 and 12 are made of a relatively hard and springy SUS material (for example, SUS301) having the same thickness (for example, 0.2 to 0.25 mm) in the entire region. As shown in FIG. 2, the cylinder block E1 and the water jackets 21 and 22 of the cylinder head E0 are positioned closer to the combustion chamber hole 15 side (left side in FIG. 2) than the bore side opening edges 21a and 22a (open ends). In the vicinity of the combustion chamber hole 15 of the upper and lower gasket substrates 11 and 12, full bead portions 11 a and 12 a that bulge so that the top portions 11 a 1 and 12 a 1 face each other at positions facing each other in the vertical direction are provided. Yes. In other words, a full bead portion 11a having a substantially trapezoidal cross section that bulges toward the cylinder block E1 side (lower side in FIG. 2) is formed in the vicinity of the combustion chamber hole 15 of the upper gasket substrate 11, while the lower gasket is formed. A full bead portion 12a having a substantially trapezoidal cross section that bulges toward the cylinder head E0 side (the upper side in FIG. 2) is formed in the vicinity of the combustion chamber hole 15 of the substrate 12, and the top portions 11a1 and 12a1 are mutually connected. They face each other with the intermediate gasket substrate 13 in between.

  The full bead portions 11a and 12a of the upper and lower gasket substrates 11 and 12 are set to have the same width (dimension in the left-right direction in FIG. 2) and bulge amount, and combustion is opposed to each other in the vertical direction. It is provided in the vicinity of the chamber hole 15. In other words, the full bead portions 11 a and 12 a of the upper and lower gasket substrates 11 and 12 have dimensions from the peripheral portion of the combustion chamber hole 15 to the top portion 11 a 1 of the full bead portion 11 a of the upper gasket substrate 11 and the peripheral portion of the combustion chamber hole 15. To the top portion 12a1 of the full bead portion 12a of the lower gasket substrate 12 is set to the same size. Each of the full bead portions 11a and 12a is located on the upper side of the upper surface of the cylinder block E1 that is disengaged from the upper position of the cylinder liner E3 to the counter-combustion chamber side 15 side. In this case, the width of each full bead part 11a, 12a is set to 2.60 mm, and the bulge amount of each full bead part 11a, 12a is set to 0.18 mm. In addition, the width | variety of each full bead part 11a, 12a should just be set to the range of 1.40-3.50 mm, and the bulging amount of each full bead part 11a, 12a is 0.09-0.30 mm. It suffices if the range is set.

  Further, the upper and lower gasket substrates 11 located on the side of the anti-combustion chamber hole 15 (the right side in FIG. 2) from the counter-bore side opening edges 21b, 22b of the water jackets 21, 22 of the cylinder block E1 and the cylinder head E0. Half-bead portions 11b and 12b that bulge so that the top portions 11b1 and 12b1 face each other at positions facing each other in the vertical direction are provided at positions on the outer end side of 12. That is, a half bead portion 11b that bulges toward the cylinder block E1 is formed at the outer end side position of the upper gasket substrate 11, while the cylinder head E0 is disposed at the outer end side position of the lower gasket substrate 12. A half bead portion 12 b that bulges toward the side is formed, and the top portions 11 b 1 and 12 b 1 face each other with the intermediate gasket substrate 13 interposed therebetween.

  The half bead portions 11b and 12b of the upper and lower gasket substrates 11 and 12 have a cross-sectional shape in which the bulging ends are directly extended to the anti-combustion chamber hole 15 side, and are provided at positions facing each other in the vertical direction. Yes. That is, the width (the dimension in the horizontal direction in FIG. 2) and the bulge amount of the half bead portions 11b and 12b of the upper and lower gasket substrates 11 and 12 are both set to be the same, and the upper gasket substrate from the peripheral portion of the combustion chamber hole 15 is set. 11 and the dimension from the peripheral part of the combustion chamber hole 15 to the top part 12b1 of the half bead part 12b of the lower gasket substrate 12 are set to the same dimension. In this case, the width of each half bead part 11b, 12b is set to 1.30 mm, and the bulge amount of each half bead part 11b, 12b is set to 0.18 mm, which is the same as the full bead part 11a, 12a. Yes. In addition, the width | variety of each half bead part 11b, 12b should just be set to the range of 1.40-3.50mm, and the bulging amount of each half bead part 11b, 12b is 0.09-0.30 mm. It suffices if the range is set.

Further, a radius of the combustion chamber hole 15 is provided at the peripheral edge portion of the combustion chamber hole 15 of the intermediate gasket substrate 13 located on the combustion chamber hole 15 side of the full bead portions 11a and 12a of the upper and lower gasket substrates 11 and 12. A folded portion 13a that is folded outward in the direction is provided. The folded end 13b of the intermediate gasket substrate 13 folded by the folded portion 13a is located on the lower surface side (lower gasket substrate 12 side) of the intermediate gasket substrate 13. The intermediate gasket substrate 13 is made of a SUS plate (for example, SUS304) that is relatively soft and has excellent workability with the same thickness (for example, 0.08 to 0.2 mm) in the entire region.

Between the folded end 13b of the folded portion 13a of the intermediate gasket substrate 13 and the bore side opening edges 21a and 22a of the water jackets 21 and 22 opened on the opposing surfaces of the cylinder block E1 and the cylinder head E0, As shown in FIG. 1, a shim 14 formed so as to surround the periphery of the folded end 13 b of the folded portion 13 a of the intermediate gasket substrate 13 is attached. The shim 14 is an intermediate gasket substrate of the lower gasket substrate 12 facing the folded side surface (the lower surface in FIG. 2) of the intermediate gasket substrate 13 folded by the folded portion 13a and the folded side surface of the intermediate gasket substrate 13. It is interposed between 13 side surfaces (upper surface in FIG. 2). The shim 14 is made of a relatively soft SUS material (for example, SUS304) having the same thickness in the entire region. In this case, a shim 14 having a thickness about 0.02 to 0.08 mm thinner than the thickness of the intermediate gasket substrate 13 is applied.

  As shown in FIG. 1, each gasket substrate 11 to 13 is provided with a cylinder in addition to the three combustion chamber holes 15, 15,... Drilled in accordance with the cylinder bores E4, E4,. A plurality of bolt holes 16, 16,... Through which fastening bolts that fasten the block E1 and the cylinder head E0 are passed, a plurality of oil return holes 17, 17,. And are formed respectively.

Therefore, in the first embodiment, when the cylinder block E1 and the cylinder head E0 are assembled, the intermediate gasket substrate serving as a stopper for preventing the full bead portions 11a and 12a of the upper and lower gasket substrates 11 and 12 from being overcompressed. Even if the full bead portions 11a, 12a of the upper and lower gasket substrates 11, 12 are not completely compressed by the folded portion 13a, the folded end 13b of the folded portion 13a of the intermediate gasket substrate 13, the cylinder block E1, and the cylinder head Since the periphery of the folded end 13b of the folded portion 13a is surrounded by the shim 14 mounted between the bore-side opening edges 21a and 22a of the water jackets 21 and 22 opened on the opposite surface of E0, the water jacket 21 and 22 bore opening edges 21a and 22 Full-bead portion 11a of the upper and lower gasket base 11, the cylinder block E1 and mutual facing surface surface pressure is secured in a gap generated between the cylinder head E0 between the 12a is prevented with. As a result, the cooling water does not enter the vicinity of the full bead portions 11a, 12a from the bore side opening edges 21a, 22a of the water jackets 21, 22, and the crevice corrosion of the cylinder block E1 and the cylinder head E0 by the cooling water is ensured. In addition to preventing the rubber from peeling from the upper and lower surfaces of the upper and lower gasket substrates 11 and 12 due to the boiling of the cooling water in the vicinity of the full bead portions 11a and 12a, it is possible to reliably prevent deterioration of the sealing performance. Can do.

Moreover, since the thickness of the intermediate gasket substrate 13 is set to the same thickness as that of the upper and lower gasket substrates 11 and 12, and is used without being thinned, the folded portion 13a is not cracked. When the folded portion 13a is formed, the warp of the intermediate gasket substrate 13 does not increase, and the product can be kept in a state where it can be handled smoothly.

  The shim 14 is formed between the folded side surface of the intermediate gasket substrate 13 folded by the folded portion 13a and the side surface of the intermediate gasket substrate 13 of the lower gasket substrate 12 facing the folded side surface of the intermediate gasket substrate 13. The intermediate gasket substrate 13 is generated when the intermediate gasket substrate is interposed between the anti-folding side surface of the intermediate gasket substrate and the intermediate gasket substrate side surface of the upper gasket substrate facing the anti-folding side surface of the intermediate gasket substrate. The shim 14 is prevented from deforming to the folded side surface due to the plate thickness, and the shim between the end of the anti-combustion chamber hole 15 of the full bead portions 11a, 12a and the bore side opening edges 21a, 22a of the water jackets 21, 22 is prevented. 14 is the surface pressure between the opposed surfaces of the cylinder block E1 and the cylinder head E0. It can be results to secure.

  Furthermore, since the shim 14 is applied with a thickness of about 0.02 to 0.08 mm thinner than the thickness of the intermediate gasket substrate 13, the difference from the thickness of the intermediate gasket substrate 13 is not too small and large. The shim 14 selected to a plate thickness that is not too large is applied, and the full bead portions 11a and 12a that may occur when the shim selected to have a plate thickness that is too small in difference from the plate thickness of the intermediate gasket substrate 13 are applied. On the bore side of the water jackets 21 and 22, which can be prevented when the shim selected is applied to a plate thickness whose difference from the plate thickness of the intermediate gasket substrate 13 is too large while the occurrence of cracks due to over compression can be prevented. Generation of gaps between the opening edges 21a and 22a and the full bead portions 11a and 12a of the upper and lower gasket substrates 11 and 12 can be prevented.

  Next, a second embodiment of the present invention will be described with reference to FIG.

  In the second embodiment, the shim mounting range is changed. The rest of the configuration excluding the shim is the same as in the first embodiment, and the same parts are denoted by the same reference numerals and detailed description thereof is omitted.

  In this embodiment, the bores of the water jackets 21 and 22 that open to the opposite ends of the cylinder block E1 and the cylinder head E0 and the opposite ends of the cylinder block E1 and the cylinder head E0 of the full bead portions 11a, 12a of the upper and lower gasket substrates 11, 12 Between the side opening edges 21a and 22a, shims 14 'formed so as to surround the periphery of the anti-combustion chamber hole 15 side end of the full bead portions 11a and 12a of the upper and lower gasket substrates 11 and 12 are mounted. Yes. The shim 14 ′ is a folded side surface (lower surface in FIG. 3) of the intermediate gasket substrate 13 folded by the folded portion 13 a and the intermediate gasket substrate 13 of the lower gasket substrate 12 facing the folded side surface of the intermediate gasket substrate 13. It is interposed between the side surfaces (the upper surface in FIG. 3). The shim 14 ′ is made of a relatively soft SUS material (for example, SUS304) having the same thickness in the entire region, and is thinner than the thickness of the intermediate gasket substrate 13 by about 0.02 to 0.08 mm. Has been applied.

Therefore, in the second embodiment, when the cylinder block E1 and the cylinder head E0 are assembled, the intermediate gasket substrate serving as a stopper for preventing the full bead portions 11a, 12a of the upper and lower gasket substrates 11, 12 from being overcompressed. Even if the full bead portions 11a and 12a of the upper and lower gasket substrates 11 and 12 are not completely compressed by the folded portion 13a, the anti-combustion chamber hole 15 side ends of the full bead portions 11a and 12a and the water jackets 21 and 22 The shim 14 'mounted between the bore side opening edges 21a and 22a of the first and second ends of the anti-combustion chamber hole 15 of the full bead portions 11a and 12a and the bore side opening edges 21a and 22a of the water jackets 21 and 22; Between the opposed surfaces of the cylinder block E1 and the cylinder head E0. Is coercive occurrence of gap is prevented. As a result, the cooling water does not enter the vicinity of the full bead portions 11a and 12a from the bore side opening edges 21a and 22a of the water jackets 21 and 22, and the crevice corrosion of the cylinder block E1 and the cylinder head E0 due to the cooling water, It is possible to reliably prevent deterioration of the sealing performance due to peeling of rubber from the upper and lower surfaces of the upper and lower gasket substrates 11 and 12 due to boiling of the cooling water in the vicinity of the portions 11a and 12a.

In addition, this invention is not limited to said each Example, The other various modifications are included. For example, in each of the above embodiments, the folded end 13b of the folded portion 13a of the intermediate gasket substrate 13 or the anti-combustion chamber hole 15 side end of the full bead portions 11a, 12a and the bore side opening edges 21a, 22a of the water jackets 21, 22 are provided. Although the shims 14 and 14 'are mounted between them, the outer end of the shim (the non-bore side end) is not necessarily located at the bore opening edge of the water jacket. For example, as shown in FIGS. Thus, the substantial sealing performance by the shims 19 and 19 ′ is that the folded end 13b of the folded portion 13a of the intermediate gasket substrate 13 or the anti-combustion chamber hole 15 side end of the full bead portions 11a and 12a and the bore side of the water jackets 21 and 22 are used. Since the outer edges 19a and 19a 'of the shims 19 and 19' are exerted between the opening edges 21a and 22a, the water jacket 1, 22 of the bore opening edge 21a, beyond 22a counter-bore side opening edge 21b, may be extended to a position which does not reach the 22b.

  In each of the above embodiments, the cylinder head gasket 1 is interposed between the cylinder block E1 and the cylinder head E0 of one bank of the V-type 6-cylinder engine E. However, the present invention is not limited to the V-type 6-cylinder engine. In addition to all V-type multi-cylinder engines such as type 8-cylinder, V-type 10-cylinder, and V-type 12-cylinder engines, it is a cylinder head gasket interposed between a cylinder block and a cylinder head of a horizontally opposed engine or an inline engine. May be.

  Further, in each of the above embodiments, the cylinder head gasket 1 is constituted by a laminated body composed of three layers of the upper and lower gasket substrates 11 and 12 and the intermediate gasket substrate 13, but is made of metal composed of four or more gasket substrates. It may be a cylinder head gasket.

  Furthermore, in each of the above embodiments, the folded end 13b of the intermediate gasket substrate 13 folded by the folded portion 13a is positioned on the lower surface side of the intermediate gasket substrate 13, but the folded end of the intermediate gasket substrate folded by the folded portion is The shim may be positioned on the upper surface side of the intermediate gasket substrate, in which case the shim is folded back by the folded portion (upper surface side) of the intermediate gasket substrate and the upper gasket facing the folded side surface of the intermediate gasket substrate. The substrate is interposed between the side surfaces of the intermediate gasket substrate.

It is a top view of a cylinder head gasket concerning Example 1 of the present invention. It is sectional drawing similarly cut | disconnected in the AA of FIG. It is FIG. 2 equivalent view which concerns on Example 2 of this invention. FIG. 3 is a view corresponding to FIG. 2 according to a modification of the first embodiment. FIG. 9 is a view corresponding to FIG. 2 according to a modification of the second embodiment. FIG. 3 is a view corresponding to FIG. 2 according to a conventional example.

Explanation of symbols

1 Cylinder head gasket (metal cylinder head gasket)
11 Upper gasket substrate 11a Full bead portion 11a1 Top portion 12 Lower gasket substrate 12a Full bead portion 12a1 Top portion 13 Intermediate gasket substrate 13a Turn-back portion 13b Turn-back end 14, 14 'Shim 15 Combustion chamber hole 19, 19' Shim 21 Water jacket 21a for cylinder block Bore side opening edge (opening end)
22 Cylinder head water jacket 22a Bore side opening edge (opening end)
E0 Cylinder head E1 Cylinder block

Claims (3)

In a metal cylinder head gasket that is interposed between a cylinder block and a cylinder head configured in an open deck type and seals between the opposing surfaces of the cylinder block and the cylinder head,
An upper gasket substrate located on the cylinder head side and closing an opening of a water jacket of the cylinder head ;
A lower gasket substrate located on the cylinder block side and closing the opening of the water jacket of the cylinder block ;
An intermediate gasket substrate disposed between the gasket substrates and disposed at a position to close the opening of the water jacket of the cylinder head and the cylinder block ;
Each of the gasket substrates is laminated in the vertical direction to be integrally formed, and a plurality of combustion chamber holes drilled in accordance with the positions of the cylinder bores opened on the opposing surface of the cylinder block are formed at required portions of the laminated body. Has
In the upper and lower gasket substrates , a full bead portion is provided on the combustion chamber hole side from the position facing the opening of the water jacket so as to swell so that the top portions face each other at positions facing each other in the vertical direction. In addition, a peripheral portion of the combustion chamber hole of the intermediate gasket substrate located on the combustion chamber hole side of the full bead portion of the upper and lower gasket substrates has a folded portion that is folded back outward in the radial direction of the combustion chamber hole. Provided,
A shim is mounted between a folded end of the folded portion of the intermediate gasket substrate and an opening of a water jacket opened on at least one of the opposed surfaces of the cylinder block and the cylinder head. An anti-combustion chamber in the shim The metal cylinder head gasket is characterized in that the hole-side end is set at a bore opening edge position of the water jacket or a position beyond the bore opening edge of the water jacket and does not reach the anti-bore opening edge. . In the metal cylinder head gasket according to claim 1,
The shim is located between the end of the anti-combustion chamber hole of the full bead and the bore side opening edge position of the water jacket, or the end of the anti-combustion chamber hole of the full bead and the bore side opening of the water jacket. A cylinder head gasket made of metal, characterized in that the metal cylinder head gasket is mounted between a position that does not reach the opening edge on the opposite bore side beyond the edge. In the metal cylinder head gasket according to claim 1 or 2,
The shim is interposed between the folded side surface of the intermediate gasket substrate folded by the folded portion and the intermediate gasket substrate side surface of the upper or lower gasket substrate facing the folded side surface of the intermediate gasket substrate. This is a metal cylinder head gasket.

Images