MXPA98005977A - Head of cylinder head, of multiple layers, with compensac intermediate plate - Google Patents

Abstract

The present invention relates to a cylinder head gasket of an internal combustion engine having at least one cylinder orifice opening and at least one fluid flow opening, the cylinder head gasket comprises: at least one plate metal base with an inner peripheral edge spaced radially outwardly from the opening of the cylinder bore, and a metallic compensating plate substantially parallel and thicker than the metal base plate, the compensating plate has first and second surfaces and an inner peripheral edge defining a portion of the orifice opening in the cylinder, an integral flange defined by an edge of the compensating plate that is flush with itself around the inner peripheral edge of the compensating plate and terminates at a free edge spaced radially outward from the inner peripheral edge of the compensatory plate to form a catch section in relation to front face with the second face, the metal base plate in front relation to the second face, the inner peripheral edge of the metal base plate adjacent to the free edge of the flange, and where a longitudinal axis is defined as perpendicular to the The gasket and the detent section comprises a step adjacent the free edge of the flange to move the detent section longitudinally in the opposite direction of the gas plate.

Description

OF CYLINDER. OF LAYERS JUTIFJ ^ - WITH PLATE T? JTOM? GA PE COMPENSATION FIELD OF INV-ENCIQN The present invention relates to improvements in multi-layer joints, and more particularly with the use of a thicker intermediate compensation plate than adjacent base plates, a radial end of one of the adjacent base plates and a bent upper portion. of the intermediate plate.

ANTECMWK? PE THE I-NVENTION Gaskets or gaskets are often used "as a seal between mechanical components in contact." A common application involves the placement of a gasket between an engine block and the cylinder head of an internal combustion engine.

The cylinder head gaskets typically extend around the cylinder bores to provide a combustion seal, keeping the high combustion temperature gases within the cylinder bores.

Simultaneously, the seals also seal openings of fluid flows such as cooler and oil openings to prevent undesirable mixing. A cylinder head gasket supports the loading of a perforated connection of the mechanical components and rests on this load to provide seals for both combustion and fluid flow. In a metallic laminate gasket for an internal combustion engine, the gasket is formed of a plurality of metal plates laminated together. The metal layers provide a seal for the engine coolant and lubricant. The metal layers also provide structural support within the junction between the cylinder head and the block, and provide radial resistance to resist bursting of the package due to pressure from the combustion chamber. In order to provide suitable joint thicknesses, it is known to use at least one thin metal intermediate plate that extends through the entire joint. It is also known to provide a thin compensation plate which provides a differential joint thickness between the combustion and fluid flow seals. Frequently, the compensation plate is bent over itself or the intermediate plate to provide the differential joint thicknesses. It is also known to provide a base plate adjacent to the compensation plate, wherein one end of the base plate is radially spaced outwardly from one end of the compensation plate. A second secondary material laminated on the compensation plate helps to provide a seal for combustion.

BRIEF DESCRIPTION OF THE INVENTION The present invention is directed to a multi-layer metal gasket, for cylinder head, for use in an internal combustion engine having at least one cylinder bore and at least one fluid flow opening. The gasket includes at least one metal base plate with an inner peripheral edge spaced radially outwardly from the cylinder bore. A metal compensation plate, substantially parallel to, and with a thickness greater than the metal base plate, is placed in front contact with the base plate. The compensation plate has two faces and an inner peripheral edge defining a portion of the cylinder bore. An integral flange is bent around the inner peripheral edge of the compensation plate and terminates at a free edge radially outwardly from the inner peripheral edge to form a sealing section which acts as the main combustion seal for the joint. The free edge of the flange is adjacent to the inner peripheral edge of the base plate and helps keep the base plate in position. The additional thickness of the compensation plate helps to ensure that an increased percentage of the total clamping load applied to the joint is focused around the combustion perforation opening. The sealing section may comprise a rung adjacent the free edge of the rim to deflect the sealing section longitudinally from the base plate, which may be desirable when the base plate includes a projection which helps provide a secondary combustion seal. In a preferred embodiment, the gasket includes a second metal base plate parallel to the first base plate and in frontal contact with the opposite face of the compensation plate. The inner peripheral edge of the second base plate helps to define a portion ie the cylinder bore and a portion of the primary combustion seal. If the second plate includes a projection, it is preferred that the projections are radially aligned with each other and that they extend in an opposite longitudinal direction and share a common longitudinal extension. The invention provides numerous advantages, in particular, by minimizing the quantity of components which form the combustion perforation opening, and the problems of accumulation of tolerances are solved. In addition, the board can be easily adapted for different applications. And material costs are also reduced.

BRIEF DESCRIPTION OF THE DRAWINGS The features and inventive aspects of the present invention will become more apparent upon reading the following detailed description, descriptions and drawings, of which the following is a brief description: Figure 1 is a perspective view of a head gasket. cylinder placed between the cylinder head and an engine block of an internal combustion engine by means of threaded fasteners. Figure 2 is an exploded cross-sectional view of the gasket before installation, positioned between the cylinder head and the engine block, taken along lines 2-2 in Figure 1. Figure 3 shows the packing in an orientation installed adjacent to the combustion opening of a cylinder with a piston. Figure 4 is an enlarged cross-sectional view of the package as shown in region 4 within a circle in Figure 3.

DESCRIPTION TO IAD OF A PREFERRED MODALITY A cylinder head gasket assembly 20 illustrated in Figure 1 includes a cylinder head 22, a motor block 24, a multilayer metal gasket 26, bolts 28 and nuts 30. The gasket 26 includes gasket punched openings 32. generally annular cylinders extending about a longitudinal axis AA, guide holes 34 for bolts 28, and fluid flow openings 36. When the assembly 20 is installed, the gasket 26 provides a combustion seal around the cylinder bore openings 32 and a fluid flow seal around the fluid flow openings 36. In Figure 2 a cross-sectional, partly exploded view of the gasket 26 positioned between the cylinder head 22 and the engine block 24 is shown. The gasket 26 includes two metal base plates 33, 40. The plates 38 and 40 are substantially parallel to each other and extend along a common radial axis defined therebetween perpendicular to the longitudinal axis A-A. The plate 38 has an inner face 42, an outer face 44 and an inner peripheral edge 46 defining a portion of the cylindrical perforation opening 32. The base plate 38 includes at least one projection 48 spaced radially outward from the peripheral edge 46. A generally planar portion 50 is defined between the protrusion 48 and the peripheral edge 46 and a generally planar portion 52 is defined radially outwardly of the protrusion 48. The base plate 40 has an interior face 54, an exterior face 56 and an exterior inner peripheral edge 58 spaced radially outwardly from the cylinder bore opening 32. The base plate 40 includes at least one projection 60 spaced radially outward from the peripheral edge 58. A generally planar portion 62 is divided between the projection 60 and the peripheral edge 58 and a generally planar portion 64 is defined radially outwardly of the projection 60. The inner faces 42 and 48 are in front relation to one another with the projections 48. and 60 radially aligned with each other. The projections 48 and 60 have a common longitudinal extension ta with respect to their respective flat portions 50, 52 and 62, 64. The base plates 38 and 40 are preferably made of carbureted stainless steel. The thickness of the plates 38 and 40 is typically about 0.20 mm. A metallic compensation and an intermediate plate 66 are interposed between the plates 38 and 40. The plate 66 is substantially parallel to the base plates and includes a first face 68 and a second face 70. The plate 66 has an inner peripheral edge 72 the which defines a perforation of the cylindrical perforation opening 32. An integral flange 74 bends around the edge 72 and determines at the free edge 76 spaced radially outwardly from the edge 72 to form a sealing section 78 comprising a double thickness of the plate 66 adjacent the edge 72. The flange 74 is in relation facing face 70. Plate 66 acts as both an intermediate plate and a compensation plate. The low carbon is fabricated from steel and may include a zinc coating 80. The plate 66 is substantially thicker than the base plates 38 and 40.

Preferably, it is about half again as thick as any base plate, and more preferably, plate 66 is about 0.30 mm thick. The base plate 38 is in facing relation to the face 68 of the plate 66 while the base plate 40 is in facing relation to the face 70 of the plate 66. The flange 74 is dimensioned so that its free edge 76 is closely adjacent the inner peripheral edge 58 of the base plate 40. Before the installation of the projections 48 and 60, which include vertices 82 and 84, respectively, are placed adjacent to the plate 66 while the respective flat portions 50, 52 and 62, 64 of the plate 38 and 40 are generally separated from plate 66 per ta. However, the plate 66 may include a rung 86 adjacent the free edge 76 and the inner peripheral edge 58 which deflects the rung section 78 longitudinally by tb. In a preferred embodiment, tb is approximately 0.05 mm. The rung 86 assists in ensuring equal compression of the projections 48 and 60 when the gasket 26 is installed, as illustrated in Figures 3 and 4. The gasket 26, by using the base plate 38 and the section 78 The shutter of the compensation plate 66 acts as a primary combustion seal against the high temperature combustion gases that are formed in the combustion bore 88 as the piston 90 moves up and down the bore in response to ignition of combustion gases. The obturator section 78 formed of the thicker compensation plate 66 helps to ensure a robust combustion seal around the opening 32 of the combustion bore. There is a space tc between the outer face 56 of the plate 40 and the block 24 of the motor, and between the outer layer 68 of the plate 66 and the inner face 42 of the plate 38, which allows a greater distribution of the load provided by bolts 28 and nuts 30 which is concentrated around the perforation 88. The protrusions 48 and 60 act as a secondary combustion seal and prevent migration of fluid to the obturator 78. Standard elastomeric coatings can be selectively applied to each of them. the plates to ensure sealing on and between them. The gasket 26 provides many important advantages.

As indicated above, a single plate 66 combines a separating layer provided by an intermediate plate and a sealing layer provided by a compensation plate within a layer. The use of the plate 66 in combination with the one having an anterior peripheral edge of the base plate 40 deviates from the sealing section 78 and minimizes the amount of components which form the combustion perforation opening and the primary combustion seal Therefore, the problems of tolerance accumulation which are caused by having different components are minimized. In addition, the close relationship between the peripheral edge 58 of the plate 40 and the free end 76 of the flange 74 helps to avoid undesirable displacement of the plate 40. The plate 66 is easily modified for different joint designs, which reduces the costs of modification of meetings. Joint costs are also reduced by the use of a compensation plate made of low carbon steel, as compared to the prior art compensation plates which are typically made of stainless steel. The embodiments and examples described are provided to illustrate the present invention. However, it does not mean that they limit the scope and spirit of the present invention. Therefore, the present invention should be limited only by the appended claims.

Claims (20)

1. A cylinder head gasket of an internal combustion engine having at least one cylinder bore and at least one fluid flow opening, the cylinder head gasket is characterized in that it comprises: at least one plate metal base with an inner peripheral edge spaced radially outward from the cylinder bore; and a metal compensation plate substantially parallel to and thicker than the metal base plate, the compensation plate has a first and second faces and an inner peripheral edge defining a portion of the cylinder piercing opening, an integral flange bent around of the inner peripheral edge of the compensating plate and ending at a radially spaced edge outwardly from the inner peripheral edge to form a sealing section in front relation with the second face, the metal base plate in front relation with the second face, the inner peripheral edge of the metal base plate adjacent the free edge of the flange.

2. The gasket according to claim 1, characterized in that the sealing section comprises a step adjacent the free edge of the flange to bias the sealing section longitudinally from the base plate.

3. The gasket according to claim 2, characterized in that the base plate includes a projection spaced radially-3 outwardly from the inner peripheral edge of the base plate.

4. The gasket according to claim 3, characterized in that the projection includes a vertex in front contact with the second face of the compensation plate.

5. The gasket according to claim 1, characterized in that the gasket further comprises a second metal base plate substantially parallel to the first base plate and in relation facing the first side of the compensation plate, an inner peripheral edge of the second one. base plate defines a portion of the cylinder bore.

6. The gasket according to claim 5, characterized in that at least one of the base plates includes a projection spaced radially outward from the free edge of the flange.

7. The gasket according to claim 6, characterized in that each of the base plates has a projection, the projections are radially aligned with each other.

8. The gasket according to claim 7, characterized in that the gaskets extend in a common longitudinal direction and share a common longitudinal extension.

9. The gasket according to claim 1, characterized in that the compensation plate is approximately half as thick as the base plate.

10. The gasket according to claim 9, characterized in that the compensation plate has a thickness of at least 0.25 mm.

11. A cylinder head gasket of an internal combustion engine having at least one cylinder bore and at least one fluid flow opening, the cylinder head gasket is characterized in that it comprises: two metal base plates substantially parallel to one another and extending along a common radial axis defined therebetween, each of the base plates has an inner face and an outer face, the inner faces are in facing relation to each other, a first plate metal base has an inner peripheral edge spaced radially outwardly from the cylinder piercing opening, and a second metal base plate having an inner peripheral edge defining a portion of the cylindrical piercing opening; a metal compensation plate substantially parallel to and interposed between the base plates, the compensation plate has a first and second faces and an inner peripheral edge defining a portion of the cylinder bore opening, an integral flange bent around the inner peripheral edge of the compensating plate and ending at a free edge spaced radially outwardly from the inner peripheral edge to form a sealing section in facing relationship on the second face wherein the first base plate is in relation facing the second face and the inner peripheral edge of the first base plate is adjacent to the free edge of the flange.

12. The gasket according to claim 11, characterized in that the compensation plate is thicker than the first base plate.

13. The gasket according to claim 12, characterized in that the base plates share a common thickness.

14. The gasket according to claim 13, characterized in that the compensation plate is approximately half as thick as the base plates.

15. The gasket according to claim 14, characterized in that each of the base plates has at least one projection, the projections are radially aligned with each other.

16. The gasket according to claim 15, characterized in that the projections extend in an opposite longitudinal direction and share a common longitudinal extension.

17. The gasket according to claim 16, characterized in that the compensation plate includes a step adjacent the inner peripheral edge of the first base plate to deflect the sealing section longitudinally away from the base plate.

18. A cylinder head gasket of an internal combustion engine having at least one cylinder bore and at least one fluid flow opening, the cylinder head gasket is characterized in that it comprises: two metal base plates of common thicknesses substantially parallel to each other and extending along common radial axes defined therebetween, each of the base plates has an inner face and an outer face, each of the base plates has at least a projection radially aligned with one another and sharing a common longitudinal extension, the inner faces are in mutually facing relation, a first metal base plate has an inner peripheral edge spaced radially outward from the cylinder bore, and a second metal base plate that has an inner peripheral edge that defines a portion of the cylinder bore; a metal compensation plate about half as thick as the base plates substantially parallel to and interposed between the base plates, the compensation plate has a first and second faces and an inner peripheral edge defining a portion of the opening cylinder bore, an integral flange bent around the inner peripheral edge of the compensation plate and ending at the free edge radially spaced outwardly from the inner peripheral edge to form a sealing section in facing relationship with the second face, wherein the first base plate is in facing relationship with the second face, and the inner peripheral edge of the first base plate is adjacent to the free edge of the flange.

19. The gasket according to claim 18, characterized in that the compensation plate includes a rung adjacent the inner peripheral edge of the first base plate for biasing the sealing section longitudinally away from the base plate.

20. The gasket according to claim 18, characterized in that the base plates are approximately 0.20 mm thick, the compensation plate is approximately 0.3 mm thick and the step is -of approximately 0.05 mm.