Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16J—PISTONS; CYLINDERS; SEALINGS
  • F16J15/00—Sealings
  • F16J15/02—Sealings between relatively-stationary surfaces
  • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
  • F16J15/08—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with exclusively metal packing
  • F16J15/0887—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with exclusively metal packing the sealing effect being obtained by elastic deformation of the packing
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16J—PISTONS; CYLINDERS; SEALINGS
  • F16J15/00—Sealings
  • F16J15/02—Sealings between relatively-stationary surfaces
  • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
  • F16J15/08—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with exclusively metal packing
  • F16J15/0818—Flat gaskets
  • F16J2015/0862—Flat gaskets with a bore ring

Definitions

• the invention relates to a sealing element for sealing flange surfaces in internal combustion engines, comprising at least one annular metal profile body.
• metal cylinder head gaskets consisting of multiple layers to join the different layers together by suitable joining methods (e.g., clinching, welding, riveting). These layers may include beads or other sealing elements in the form of polymeric gaskets to seal fluids or grass.
• sealing elements must have sufficient spring properties to compensate for static unevenness of the sealing surfaces as well as dynamic sealing gap vibrations (when used as a cylinder head gasket).
• these seals must be stiff enough not to give way in such a way that an insufficient clamping force causes an outbreak of the sealing element.
• GB 979,408 discloses a seal of a cylinder liner formed by an annular metallic profiled member which, viewed over its radial wall thickness, has a uniform height and a substantially symmetrical cross-sectional profile. Between the cylinder head and engine block, a cylinder head gasket is arranged, which has a radial clearance for receiving this Profile body has. Due to the outwardly curved contour of the sealing element, which exceeds the axial height of the cylinder head gasket, the profile body is elastically deformed during bracing of the engine block and cylinder head within him him receiving groove such that at maximum deformation pressure of the profile body with the exception of its lateral Aufhahme Schle still defined Distance from the groove bottom of the receiving groove.
• the profile body is made of a stainless steel and has at least nutgrund lake sharp-edged transition areas from the respective radial end boundary in the associated axial edge. Here, the sharp-edged transition areas provide the sufficiently high surface pressure in the region of the two sealing lines.
• a sealing ring for the sealing of cylinder covers in internal combustion engines consisting of at least one layer of sheet metal, wherein the layer is formed in section circular section and the inner edge and the outer edge are arranged in a plane.
• the axial height of the sealing ring seen over its entire radial wall thickness, the same design.
• the sealing ring consists of two mirror-inverted sealing rings, which touch each other along an average diameter.
• the invention has for its object to provide a novel sealing element for sealing flange surfaces in internal combustion engines, on the one hand has enough spring properties to compensate for static unevenness of the respective sealing surface and, if necessary, dynamic sealing gap vibrations.
• the sealing element must be stiff enough not to yield so that an insufficient clamping force causes an outbreak of the sealing element.
• the profile body consists of a wire and has at least one core and at least one bending region, wherein the Material thickness of the wire in the core region is greater than formed in the respective bending region.
• the subject invention is based on the technical embodiment of a bending beam.
• the bending beam is loaded from above, approximately in the middle, and the force is supported by the two support points on the outside of the underside.
• the support points are exactly definable and on the other hand, the force distribution between the support points is adjustable.
• the thickness of the bending beam correlates with the rigidity of the system and the spring characteristics (material selection) associated with the system.
• Embodiments on, namely the radial wall thickness of the wire is profiled in such a way that it corresponds approximately to the geometric shape of a banana; the wire has such a profile that the radial ends form two upper and two lower bending regions to form an incision; the wire has such a profile that radially inwardly or outwardly there is a thickened core region and at the opposite end of the cross section two bending regions are formed, which in the initial state exceed the axial height of the core region.
• This mode of action which corresponds to the classical bending beam, is also to be transferred to the further profiles underlying the object of the invention.
• the outer ends that form bending regions bend elastically until, in total compression, again only the middle region is worn.
• a spring element is combined with an integrated stopper element.
• the stopper height or the installation height thus results from the largest cross-section or the largest cross-sections, if several sub-areas are formed as core areas.
• the design of the elastic regions define the spring behavior (and the sealing force) of such a wire profile.
• the contour can be selected so that the sealing force can be set exactly at the installation point. This ensures that both the static irregularities of the respective flange surface and, if necessary, dynamic sealing gap vibrations can be compensated. If an additional micro-seal should be required, the profile wire ring, for example, even completely or only partially coated.
• the wire profile asymmetrical.
• the force distribution (delay) on the engine block or on the cylinder head can be positively influenced.
• the sealing element according to the invention can be used both in combination with a cylinder head gasket and with a flat gasket or as a single sealing element, for example in the exhaust gas line of an internal combustion engine.
• Sequence demands are exemplary conceivable: additional (at least partial) coating for the micro-seal, joining the profile wire sealing ring (it is also conceivable that the sealing ring is not joined at the joint similar to a piston ring, but so remains), forming at least one zone or an area that is needed for a joining process.
• the profiled wire is, according to a further idea of the invention, made of a spring steel, which advantageously has a yield strength ⁇ 600 MPa.
• the wire is made of a non-stainless steel.
• the materials used for the profile wire are all spring steels which bring about elastic or springy properties.
• Examples include austenitic chromium-nickel steels, martensitic chromium steels, bainitic or martensitic carbon steels or multiphase steels.
• austenitic chromium-nickel steels martensitic chromium steels, bainitic or martensitic carbon steels or multiphase steels.
• nickel-based alloys When used as a sealing element in the exhaust system, reference is made to nickel-based alloys.
• the combination of the suitable material or possibly also the suitable materials, if necessary, including a hardening process and / or a heat treatment and the optimized geometry (wire cross-section) ensure the function of the sealing element according to the invention under all operating conditions depending on the installation.
• each other adapted geometric shape of the sealing element may be most favorable (depending on the combustion pressure and the combustion temperature different cross-sections are possible ).
• the thickness of the respective core region, the cross section of the respective bending region and the selected material can be adjusted, which spring action and which mounting thickness of the profile wire sealing ring should have.
• a kind of stopper can be realized with the respective core region of the wire.
• the joining process which can also be used as needed, it is conceivable to use force, form and cohesive methods. However, it can also be a combination, for example of a positive and cohesive process (for example a mechanical clamping with subsequent adhesion of the joint).
• FIG. 5 shows a plan view of the sealing element according to FIG. 4;
• Figure 8 is a graphical representation of the load over the deflection of a sealing element according to the invention in comparison to a conventional bead.
• FIG. 1 shows a sealing element 1 in the form of a banana, which has defined elastic (spring) properties.
• Figures 2 and 3 show sealing elements 1 ', I "in Figure 1 derived embodiments.
• An essential feature of all geometries according to FIGS. 1 to 3 is that the same on the one hand has at least one core region 2, 2 ', 2 "which can assume a stopper function under conditions of use (depending on the arrangement of the sealing element) and, on the other hand, at least one elastically flexible region 3, 4 , 3 ', 4', 3 ", 4", which ensures the elastic sealing function under conditions of use.
• the sealing element 1 according to FIG. 1 which has the banana-shaped geometry, has the highest cross section in its center. To the two ends 3,4, the cross section tapers (evenly or unevenly). This means that under load F, the respective elastic ends 3,4,3 ⁇ ⁇ ⁇ 3 ", 4" until only total compression of the core region 2,2 ', 2 "will wear.
• a spring element (bending region 3, 4, 3 ', 4', 3 ", 4") is combined with a stopper element (core region 2, 2 ', 2 ") with the aid of the subject invention
• the stopper height or the installation thickness thus results from the largest cross section or the largest cross sections (if several subregions of the sealing element 1,1 ', I "are formed as core regions) of such a profile.
• the design of the elastic regions 3,4,3 ', 4', 3 ", 4" define the spring behavior and the sealing force of such a sealing element 1,1 ', 1 ".
• the sealing element 1, 1 ', 1 "according to the invention can not only be arranged between the engine block and the cylinder head, but can also be used for sealing in the exhaust gas line.
• sealing element 1.1 ', I "according to the invention is to be used in the region of a cylinder head gasket, the material must be usable for temperatures up to approximately 350 ° C. If the sealing element according to the invention 1,1 ', 1 ", for example, used as an exhaust gasket, it must be suitable for use at temperatures> 35O ° C, up to about 1000 ° C, suitable.
• nickel-base alloys or nickel-base superalloys can be used.
• a sealing element according to the invention are here essentially nickel-chromium steels with a chromium content between 17 and 23% and a nickel content between 25 and 55%.
• FIG. 4 shows an indicated preassembled state. Visible is a cylinder head 5 and an engine block 6, which includes at least one combustion chamber 7.
• a sealing element 1 ' according to FIG. 2 is intended to come here. Shown is the untensioned state, that is, the sealing member 1 'was first positioned between the engine block 6 and the cylinder head 5.
• FIG. 5 shows the sealing element 1 'according to FIG. 4.
• the annular formed profiled sealing element 1' should in this example have been produced as an open profiled body whose free end regions 8, 9 have been connected to one another by a suitable joining method, for example a weld 10.
• FIGS. 6 and 7 show the sealing element 1 according to FIG. 1, firstly in a position corresponding to FIG. 4 (FIG. 6) and secondly in the state of total compression (FIG. 7).
• Recognizable is the core area 2 and the bending areas 3,4. If the sealing element 1, for example, between a cylinder head 5 and an engine block 6, are braced, is deformed by applied external axial force F of the respective bending region 3,4 in the radial direction, while in total compression of the core region 2 between the sealing surfaces 5 ', 6' is clamped and thus a stopper region 11 is formed. As a result, a type of three-point support 3,4,11 is formed, wherein the bending portions 3,4 remain elastically deformable and thus able to follow dynamic sealing vibrations.
• FIG. 8 shows a graph of the load plotted against the deflection. Compared are traditional beads 12 and the profile wire according to the invention, e.g. the one according to FIG. 1
• An ideal load-deflection curve is represented by a horizontal line in the load-deflection diagram. This means that at the beginning the deformation of the profile wire 1 increases proportionally with increasing load. From a certain load level, the load remains substantially the same as the profile continues to deform. Only when the profile has been almost completely deformed, the load increases, with only a small deformation, very strong. With total compression, only the load can be increased.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Gasket Seals (AREA)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

Country Status (5)

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Family Cites Families (33)

• 2009
  • 2009-06-19 CN CN2009801017365A patent/CN101910690A/zh active Pending
  • 2009-06-19 EP EP09765452A patent/EP2291590A1/de not_active Withdrawn
  • 2009-06-19 WO PCT/DE2009/000843 patent/WO2009152816A1/de active Application Filing
  • 2009-06-19 US US13/000,564 patent/US20110109049A1/en not_active Abandoned
  • 2009-06-19 JP JP2011513869A patent/JP2011525228A/ja active Pending

Non-Patent Citations (1)

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