MXPA99002032A - Three layer packaging with primary and second sealing element - Google Patents

Abstract

The present invention relates to a gasket for use in an internal combustion engine comprising: a first metal plate having a base portion and a first plate opening which is displaced longitudinally downward relative to the base portion, the first plate forms a first portion of a primary combustion seal and a first portion of a secondary combustion seal, the secondary combustion seal is positioned adjacent to the primary combustion seal and racially outward of the first plate opening, a second metal plate disposed adjacent to the first plate, the second plate has a body portion, an angled arm, a displaced portion, a curved portion and a flange, wherein the angled arm is disposed between the body portion and the displaced portion, and deflects the portion displaced longitudinally with respect to the body portion, the curved portion defines a second At the plate opening and extending away from the displaced portion, the flange extends away from the curved portion so that the flange is spaced apart and generally parallel to the displaced portion to form a second portion of the primary combustion seal; metal plate having a third plate opening and forming a second portion of the secondary combustion seal, the third plate is positioned adjacent to the second plate so that a portion of the second plate is disposed between the first plate and the third plate, the The third plate opening has a diameter greater than that of the second plate opening and is positioned such that the third plate is in an orientation that does not overlap with such an offset portion of the second plate and the second portion of the secondary combustion seal is positioned adjacent to the plate. the third plate opening, where the primary combustion seal e The displacement of the secondary combustion seal to ensure equal compression of the secondary combustion seal and primary combustion seal when the gasket is operatively positioned between coupling components.

Description

THREE LAYER PACKAGING WITH PRIMARY AND SECONDARY SEALING ELEMENT FIELD OF THE INVENTION The present invention relates to an improvement of multi-layer metal packings, and very particularly to three-layer metal packings which both have a primary and secondary combustion seal.

BACKGROUND OF THE INVENTION Gaskets are often used to provide a seal between an engine block and a cylinder head of an internal combustion engine. Cylinder head gaskets typically extend around the cylinder bores to provide a combustion seal, keeping the high temperature combustion gases within the cylinder bores. The gaskets can also serve to seal the fluid flowing in the openings, such as the openings for the oil and the cooler to prevent undesirable mixing. However, internal combustion engines have recently been operated at increasingly high engine speeds and with increasing outputs. Therefore, more durable combustion seals are required. To ensure a satisfactory sealing capability for both the combustion and fluid seals, it has been known how to provide a multilayer metallic gasket with specialized rewards to achieve both a wear resistance seal around the cylinder bores as well as a seal. Effective fluid seal around the fluid flow openings. Such packings have a high temperature coating with a low coefficient of friction applied around the cylinder bores and an elastomeric coating applied around the fluid flow openings. However, gaskets of these types are often expensive and difficult to manufacture, as the coatings are selectively applied only to portions of one side of a particular gasket layer. Therefore, it is necessary to apply masking techniques, which increase the production stages and limit the effectiveness of such packings.

To overcome the problems associated with masking, a known multilayer gasket incorporates three plates where a particular coating is applied to the specific layers of the gasket. A high emperature coating is used to improve the seal around the combustion hole openings while using an elastomeric seal coating to improve the seal surrounding the fluid flow openings. Although such gaskets function satisfactorily, increased durability around the combustion seal is desired.

BRIEF DESCRIPTION OF THE INVENTION The present invention is directed to an improved three-layer gasket for an internal combustion engine. The gasket incorporates 1 plates, each of the plates having first recesses to match the cylinder holes of a motor block and second openings to serve as the fluid flow openings. The plates combine to form at least two combustion seals, a primary combustion seal and a secondary combustion seal, and a fluid seal. The inclusion of a primary and secondary combustion seal serves to increase the durability of the combustion seal area of the gasket without requiring excessive linings or the addition of shims. In the described embodiment, a first plate has a first opening, a base portion, and three sealing beds. A first sealing bed is formed adjacent to the first opening to form a first portion of the primary combustion seal. A first end of the first sealing bed is larger than the other end in order to place a periphery of the plate downwardly with respect to the base portion. A second sealing bed is formed radially outward of the first sealing bed to form a first portion of the secondary combustion seal. A third sealing bed is formed adjacent to the second opening to form a first portion of a fluid seal. A second plate adjacent to an outer surface of the first plate is provided and has a body portion, a deviation portion, a curved rorion extending around the periphery of the first plate and away from the deviation portion, and a flange extending away from the curved portion, the flange is positioned away from and generally parallel to the deviation portion. An arm at a downward angle extending from the body portion places the deviation portion lengthwise downwardly relative to the body portion. The curved portion, the deviation portion and the flange form a second portion of the primary combustion seal. The angled arm is in parallel alignment with the first end of the first sealing bed of the first plate so that a portion of the first sealing bed is captured between the flange and the diverting portion to form the primary combustion seal. The second plate also includes a second opening corresponding to, and which is generally aligned with the second opening of the upper plate to form a second portion of the fluid opening. A third plate adjacent to an outer surface of the second plate is arranged so that the second plate is disposed between the first and third plates. The second plate includes two beds, a first bed and a second bed. The first bed is generally aligned with, and in opposition to, the second bed of the first board, to form the secondary combustion seal. The second bed is generally aligned with, and in opposition to, the third bed of the first board to form the fluid seal. The angle arm of the second plate cooperates with the first end of the first sealing bed of the first plate for placing the primary combustion seal, the secondary combustion seal and the fluid seal along a central ee. Therefore, an equal compression of all seals is ensured when bolts are put into the gasket to place them in place. Preferably, the plates also include specialized coatings, a high temperature resistant coating and an elastomeric coating, to improve the sealing areas. The first plate is coated on both sides with the elastomeric coating. The second plate is coated with the high temperature resistant coating on the lower surface of the plate in order to coat the primary seal -of combustion. The third plate includes an elastomeric coating, according to the lower surface of the plate.

BRIEF DESCRIPTION OF THE DRAWINGS The characteristics and the inventive aspects of the present invention will be more apparent after reading the following detailed description, claims and drawings, of which the following is a brief description: Figure 1 is a view flat portion of a gasket embodying the present invention. Figure 2 is a cross-sectional view of one embodiment of the present invention, taken along line 2-2 of Figure 1. Figure 3 is a cross-sectional view with its parts detached from an embodiment of The present invention taken along line 2-2 of Figure 1. Figure 4 is a cross-sectional view of an alternative embodiment of the present invention taken along line 2-2 of Figure 1. .

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Figure 1 shows a gasket 20 for use with an internal combustion engine. The gasket 20 has a plurality of bolt holes 21 and the first openings 22 that are adapted to match the cylinder bores of an engine block. Preferably, the gasket 20 is also provided with the second openings 24 which serve as fluid flow openings for the engine cooler and the like. The gasket 20 is constructed in order to provide at least two combustion seals, a primary combustion seal 26 and a secondary one 28 around each first berth 22. The inclusion of secondary combustion seal 28 advantageously increases the durability and the combustion sealing area to prolong the wear life of the gasket 20. Fluid seals 30 are provided around the second openings 24 to edit undesirable mixing of engine fluids such as the cooler and the oil. With reference to Figures 2 and 3, the emote 20 is constituted by three metal plates, a first plate 32, a second plate; 4 and -i to the third plate 36. The plates 32, 34 and 36 are assembled so that a section of the second plate 34 is disposed between the first plate 32 and the third plate 36. The plates 32, 34 and 36 cooperate for forming the primary combustion seal 26, the secondary combustion seal 28 and the seal 30 of the fluid. The first plate 32 and the third plate 36 are made of a hardened material such as stainless steel SAE 301 completely hard or steel for leaf springs. Preferably, the first and third plates 32 and 36 have s u s t a nc i a lm e the same thickness in the scale of about 0.15-0.30 mm. The second plate 34 may be manufactured from a wide variety of low carbon steel or stainless steel. The second plate 34 is thicker than the first and third plates 32 and 36, and has a thickness in the scale of about .2 '- U.50 mm. The first plate 32 has a first opening 38, a second opening 40 and three integral sealing beds 42, 44 and 46. The first opening 38 is defined by a first plate end 48 and has a diameter that is slightly larger than the diameter of the first opening 22 in the gasket 20. The second opening 40 is spaced apart from the first opening 38, so that the sealing beds 42, 44 and 46 are disposed therebetween. The second opening 40 can be constructed to receive a sealing member 50, separated with a second opening 24 disposed therein to serve as an opening for fluid flow, as shown in Figure 1. A first sealing bed 42 is formed adjacent to the first opening 38 and having the ends r? 2a and 52b at an angle defining a vortex 54. The end 52a extends downwards from ur. to base portion 53 of a first plate 32 and has a length that is greater than a length L2 of the extremity 52b. The limbs 52a and 52b are oriented to position pi vertex 5 longitudinally downward with respect to the base portion 53. Adjacent the limb 52b is a flange portion 56 that reaches the first end 44 of the plate. Due to the length L of the extremity 52b, a lower surface 58 of the flange portion 56 is preferably positioned longitudinally below a lower surface 60 of the base portion 53. The sealing plate 42 and the flange portion 56 cooperate to form a first portion of the primary combustion seal 26.

A second sealing bed 44 is formed to lie to the first sealing bed 42, so that the second sealing bed 44 is radially outwardly spaced from the first sealing bed 42 with a section of the base portion 53 disposed between the two. same. The second sealing bed 44 has the angled ends 62a and 62b defining a vertex 64. The extremities 62a and 62b are substantially of the same length and are oriented to place the apex 64 upwards with respect to the base portion 53. The second sealing bed 44 forms a first portion of the secondary combustion seal 28. Alteratively, i; > tremidae 52a can serve as a limb for both the first sealing bed 42 and the second sealing bed 44 so that there will be no base portion 53 disposed therebetween, as seen in Figure 4. A third bed is formed 46 is sealed to the second opening 40 so that the second sealing bed 44 is disposed between the first sealing bed 42 and the third sealing bed 46 '. The third sealing bed 46 has the angled extremities 66a and 66b defining a vertex 68. The extremities 66a and 66b are oriented to place the vertex 68 upwards with respect to the base portion 53 where an upper surface 70 of the vertex 68 is in substantial alignment with a top surface 72 of a vertex 64. The third sealing bed 46 forms a first portion of fluid seal 30. The second plate 34 has a substantially flat body portion 74, a deviation portion 76, a curved portion 78 and a flange 80. The deviation portion 6 is positioned longitudinally downwardly from the body portion 74, due to a arm 82 at a downward angle disposed between the body portion 74 and a deviation portion 76. The curved portion 78 defines a periphery of the opening 22 and is adjacent to the deviation portion 76. In addition, the curved portion 78 curves upwardly from the deviation portion 76 to separate the flange 80 away from and generally parallel to the desalination portion 76. The "deflection portion", the curved portion "78" and the tab "tf" u cooperate to form a second portion of the primary combustion seal 26. The second plate 34 also includes an opening 83 which corresponds and is in alignment with the second opening 40 in the first plate 32. The second plate 34 is positioned adjacent the first plate 32 where an upper surface 84 of the second plate 34 makes contact with the lower surface 60 of the first plate 32, as shown in Figure 2. The angled arm 82 is in alignment parallel with the extremity 52a such that a surface 86 of the apex 54 is supported by the deviation portion 76 . The flange 80 and the curved portion 78 cooperate to capture the flange portion 56 between the flange 80 and the diverting portion 76, so that a portion of the first sealing bed 42 of the first plate 42 is disposed between the flange 80. and the deviation portion 76, thereby forming the primary combustion seal 26. The third plate 36 includes a base portion 88, a first opening 89, a second opening 90, a first sealing bed 92 and a second bed 94. The opening 90 corresponds to, and is in general alignment with the apertures 40 and 83 in the first and second plates 32 and 34, respectively, so as to form the second opening 24 in the gasket 20. The first sealing bed 92, which forms a second portion of the secondary combustion seal 28 is positioned adjacent the first opening 89. The first sealing bed 92 has the angled ends 96a and 96b defining a vertex 98. The ends 96a and 96b orient the vertex 98 downwards relative to the base portion 88. The second sealing bed 94, which is adjacent to the opening 90, has the extremities at angles 100a and 100b defining a vertex 102. The extremities 100a and 100b orient the rtice 102 down from the base portion 83 to form a second portion of the fluid seal 30. The third plate 36 is placed adjacent to the second plate 34, so that an upper surface 104 of the base portion 88 makes contact with a lower surface 106 of the second plate 34. The first sealing bed 92 is placed directly below and in alignment with the second sealing bed 44 of the first plate 32, so that the sealing beds 44 and 92 are in opposition, thus forming the secondary seal 28 of - ^ mcustión. The addition of the secondary combustion seal 28 increases the durability of the combustion area of the package 20, thereby increasing the wear life of the gasket 20 and reducing the overall production costs of the engine. The second sealing bed 94 is positioned directly below and in alignment with the third sealing bed 46 of the first plate 32 so that the sealing beads 46 and 94 are in opposition, thereby forming the fluid seal 30. The third plate 36 is dimensioned such that a periphery 107 of the first opening 89 of the third plate 36 is positioned directly below where the arm 82 of the second plate 34 extends from the body portion 74, so that the third plate 36 does not overlap the deviation 76 of the second plate 34. Alternatively, the third plate 36 can terminate at vertex 102, as seen in Figure 3, and thereby increase the compression capacity of secondary screw 28. of combustion. When the gasket 20 is bolted, the sealing force is created around the openings 22 and 24. The presence of all the sealing beds serves to further increase the sealing efforts. The descending angled extremity 52a of the first plate 32 and the angled arm 82 of the second plate 34 cooperate to ensure that the primary combustion seal 26, the secondary combustion seal 28 and the fluid seal 30 are all positioned at along a central axis so that the gasket 20 exerts pressure uniformly and thus ensures a satisfactory seal. Before manufacturing the gasket 20, the plates 32, 34 and 36 may also be provided with certain coatings to improve the sealing of both the primary and secondary combustion seals 26 and 28 and the fluid seals 30. In the preferred embodiment, the first plate 32 is coated on an upper surface 108 as a lower surface 60 with an elastomeric coating 110, such as a rubber coating, which is approximately 0.025 mm thick on both surfaces 108 and 60. The second plate 34 is preferably completely coated only on the lower surface 106 with a high temperature resistant coating 112, such as olybdenum disulfide or polytetrafluoroethylene ("PTFE"). Once the second plate 34 is formed in the desired shape as shown in Figure 3, the liner 112 is disposed between the flange 80 and the engine head (not shown), thereby reducing friction and improving the capacity sealing on the primary combustion seal 26. The coating 112 has a preferred thickness between 0.010-0.020 mm with a most preferred thickness of about 0.125 mm. The third plate 36 has an elastomeric liner 114 that is similar to that of the liner 116 for the first plate 32, the liner 114 only applying on a lower surface 116 of the third plate 36. Although the gasket 20 has shown a preferred orientation It is understood that the gasket 20 can be positioned so that the first plate 32 is placed on the lower part of the gasket 20 without departing from the invention. In addition, although complete echo beds are shown, it is understood that other types of beds or other suitable sealing elements can be used. Preferred embodiments of the present invention have been described. The person skilled in the art will realize, however, that certain modifications fall within the teachings of this invention. Therefore, the following claims should be studied to determine the true scope and content of the invention.

Claims (18)

1. A gasket for use with an internal combustion engine comprising: a first metal plate having a base portion and a first opening of the plate, the first plate forming a first portion of a primary combustion seal and a first portion of a seal secondary combustion, the secu- ary combustion seal is placed radially outward from the primary combustion seal; a second metal plate disposed adjacent to the first plate, the second plate having a body portion, an angled arm, a deflection portion, a curved portion and a r is a, where the angle arm is disposed O r . of the body portion and the deviation portion, and deflects said deviation portion longitudinally with respect to the body portion, the curved portion defines a second plate opening and extends away from the deviation portion, the flange extends into the said portion being curved so that the flange is spaced apart generally parallel to the diversion portion to form a second portion of the primary combustion seal; and a third metal plate having a third plate opening and forming a second portion of the secondary combustion seal, the third plate being placed adjacent to the second plate such that a portion of the second plate is disposed between the first plate and the third plate, the third plate opening has a diameter greater than that of the second plate and is positioned so that the third plate is in an orientation that does not overlap with such a deviation portion of the second plate.

2. The gasket as mentioned in rei indication 1, wherein the second plate has a high temperature resistant coating on a lower surface thereof to seal around the first plate opening and to improve the primary combustion seal .

3. The gasket as recited in claim 1, a periphery of the first plate opening deviates longitudinally downwardly relative to the base portion.

4. The gasket as recited in claim 1, wherein the first plate includes a first sealing bed positioned adjacent to the plate opening recess, wherein an angled end from the primary sealing bed deflects such periphery of the first opening. of plate down with respect to the base portion of the first plate.

5. The gasket as mentioned in the indication 4, wherein a portion of the first sealing bed is captured between the flange and the deviation portion of the second plate.

6. The packing as cited in the : "indication" 4, wherein the first plate includes a second sealing bed positioned radially and outwardly from the first sealing bed, the second sealing bed has a vertex that extends upwardly with respect to the portion of said sealing bed. base.

7. packing as cited in the rei indication 6, wherein the third plate includes a third plate sealing bed generally aligned with, and in opposition to, the second sealing bed of the first plate.

8. The gasket as recited in claim 7, wherein the third plate bed ends at a vertex of the third plate sealing bed so that the apex is spaced apart and parallel from the body portion of the second plate.

9. The gasket as recited in claim 1, wherein the plates have a generally uniform thickness, the first and third plates having a thickness less than a thickness corresponding to that of the second plate.

10. A gasket for use with an internal ambush motor, comprising: a first metal plate having a base portion, a first opening, a second opening and at least three sealing beds, a first sealing bed being placed adjacent to The first opening, a second sealing bed is positioned radially outwardly from the first sealing bed, a third sealing bed is placed adjacent to the second opening, wherein an end at an angle from the first sealing bed, des ia a periphery of the first opening in a longitudinal direction with respect to the base portion; a second metal plate placed adjacent to the first metal plate, the second plate has a first opening, a second opening, a body portion, an angled arm, a deviation portion, a curved portion and a flange, wherein the arm at an angle is positioned between the body portion, such a distraction portion and deflects such a portion of deviation ongitudinally with respect to the body portion, - 1: > Razo in gulo is in parallel alignment with the extremity of the first plate. The curved portion adjacent to the second plate, the first opening and extending away from the proportion of deviation and around the periphery of the rim was the opening of the first plate, the flange extending away from the curved portion, so that the flange is spaced apart and generally parallel to the diversion portion, thereby capturing a portion of the first sealing bed of the first plate, between the diversion portion and the flange to form a primary combustion seal, the second opening of the second plate corresponds to, and is generally aligned with the second opening of the first plate; and a third metal plate having a first opening, a second opening, a first sealing bed, a second sealing bed, the third plate being placed adjacent to the second plate and opposite the first plate for arranging a portion of the plate. Second plate between the first and third plates, the third plate is positioned so that the first sealing plate of the third plate is in alignment with, and in opposition to, the sealed bed of the first plate and the second bed of the second plate. sealing of the third plate is in alignment with, and in opposition to, the third sealing bed of the first plate to form a secondary seal of combustion, and a fluid seal, respectively, the first opening of the third [coating is dimensioned for be in a direction that does not overlap with the desalination portion of the second plate, the second opening of the third plate corresponds to, and is generally aligned with the second plates. of the first and second plates.

11. The gasket as recited in claim 10, wherein the first plate has an elastomeric coating on an upper surface of the first plate to improve the flow of fluids.

12. The gasket as mentioned in the indication rung 11, wherein the first plate has an elastomeric coating on a lower surface of the first plate so that when the first plate is placed adjacent to the second plate, the fluid seal improves. between the first and the second plates.

13. The gasket as mentioned in rei indication 11, wherein the third plate has an elastomeric coating on the lower surface of the third plate to improve the fluid seal.

14. The gasket as recited in claim 10, wherein the second plate has a coating at high temperatures on a lower surface of the second plate for the aligning seal of the first opening of the second plate and improving the primary sealing seal. .

15. The gasket as cited in the claim, wherein the coating at high temperatures is polytetrafluoroethylene.

16. The gasket as recited in claim 12, wherein the coatings 1 to s are rubber.

17. According to claim 10, wherein the plates have a generally uniform thickness, the first and third plates have a thickness less than a corresponding thickness of that of the second plate.

18. A gasket for use with an internal combustion engine, comprising: a first metal plate having a base portion, a first opening, a second opening and at least three sealing beds, a first sealing bed is placed adjacent to In the first aperture, a second sealing bed is radially outwardly shrouded from the first sealing bed, a third sealing bed is positioned adjacent to the second aperture, wherein a corner at an angle from the first sealing bed deflects a periphery of the first opening in a longitudinal downward direction relative to the base portion, a first elastomeric coating disposed on a top and bottom surface of the first plate; a second metal plate placed adjacent to the first metal plate, the second plate has a first opening, a second opening, a body portion, an angled arm, a deflection portion, a curved portion and a flange, wherein the arm at an angle is positioned between the body portion and the deviation portion and deflects the deviation portion 1 from 1 to below the body portion d, the angle arm is in parallel alignment with the extremity of the first license plate. The curved portion adjacent to the first opening of the second plate, and extending away from the deviation portion and around the periphery of the first opening of the first plate, the flange extends away from the curved portion, so that the flange is spaced apart and generally parallel to the diverting portion, thereby capturing a portion of the first sealing bed of the first plate, between the diverting portion and the flange to form a primary combustion seal, the second opening of the second plate corresponds to, and is generally aligned with, the second opening of the first plate, a coating being disposed at high temperatures on a lower surface of the second plate for sealing around the first opening of the second plate when the packing it is adjusted to improve the primary and secondary combustion seals, and a third metal plate that has a pri a mere opening, a second opening, a first sealing bed, and a second sealing bed, the third plate being placed adjacent to the second plate and opposite the first plate for arranging a portion of the second plate between the first and third plates, the third plate is positioned so that the first sealing bed of the first plate is in line with, and in opposition to, the second sealing plate of the first plate and the second sealing plate of the third plate is in alignment with, and in opposition to, the third sealing bed of the first plate to form a secondary combustion seal, and a fluid seal, respectively, the first opening of the third plate is dimensioned to be in an orientation that does not overlap with the deviation portion of the second plate, the second opening of the third plate corresponds to, and is generally aligned with the second openings of the first and second plates, and an elastomeric coating being disposed on a lower surface of the third plate, The elastomeric coating of the third plate cooperates with the coatings of the first plate to improve the seal to the fluids.