Multilayer metal sealing gasket for cylinder cover of diesel engine

Abstract

The utility model discloses a multilayer metal sealing gasket for a cylinder cover of a diesel engine, which relates to the technical field of sealing gaskets and comprises a gasket body, a plurality of cylinder holes formed in the gasket body and a first sealing component arranged on the gasket body and used for sealing the outermost sides of the cylinder holes. A second sealing assembly used for improving the overall sealing effect and a dynamic sealing assembly used for self-adaptive sealing are arranged in the gasket body. The first sealing assembly enables oil at a cylinder hole to be difficult to flow out of a cylinder, the second sealing assembly can compensate for uneven overall deformation of a gasket body through local plastic deformation in a high-temperature environment, the high temperature can trigger the sealing effect of the gasket to a large extent, and the dynamic sealing assembly can seal the sealing effect of the gasket to a large extent under the high-temperature condition. The expansion rate of the internal material causes large-degree non-plastic deformation, the interior of the gasket body is actively pressed, dynamic sealing is carried out along with the working temperature of the gasket body, and the sealing performance of the gasket body is good.

Description

Technical Field

[0001] This utility model relates to the field of sealing gasket technology, and in particular to a multi-layer metal sealing gasket for a diesel engine cylinder head. Background Technology

[0002] The cylinder head gasket is a critical sealing element in a diesel engine. Its core function is to prevent leakage of high-temperature, high-pressure combustion gases, lubricating oil, and coolant, ensuring efficient and stable engine operation. A good seal reduces the erosion of the cylinder head gasket by combustion gases, avoids localized overheating and mechanical wear caused by leaks, thereby reducing maintenance frequency and improving engine reliability.

[0003] Traditional cylinder head gaskets are made of two metal gaskets with an asbestos board sandwiched in between, or two layers of asbestos board with a metal punched plate sandwiched in between. These gaskets have poor sealing performance, are very easy to damage under high-temperature conditions, have a short service life, and are difficult to meet usage requirements. Summary of the Invention

[0004] The purpose of this invention is to provide a multi-layer metal sealing gasket for diesel engine cylinder heads in order to solve the problem of poor sealing.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A multi-layer metal sealing gasket for a diesel engine cylinder head includes a gasket body and further includes: a plurality of cylinder holes formed on the gasket body; a first sealing component for sealing the outermost part of the cylinder holes on the gasket body; a second sealing component for improving the overall sealing effect and a dynamic sealing component for adaptive sealing within the gasket body.

[0007] As a further description of the above technical solution: the first sealing assembly includes a plurality of sealing rings, and the plurality of sealing rings are respectively fixedly disposed inside a plurality of cylinder bores.

[0008] As a further description of the above technical solution: the second sealing assembly includes a pair of martensitic steel plates and a plurality of sealing ribs, the plurality of sealing ribs being fixedly disposed on both sides of the pair of martensitic steel plates, and the plurality of sealing ribs corresponding one-to-one with a plurality of cylinder holes.

[0009] As a further description of the above technical solution: the dynamic sealing assembly includes a flexible graphite plate, multiple circular grooves and fluororubber. The flexible graphite plate is fixedly disposed between a pair of martensitic steel plates. The multiple circular grooves are respectively opened on both sides of the flexible graphite plate, and the multiple circular grooves correspond one-to-one with multiple cylinder holes. The fluororubber is respectively coated in the multiple circular grooves.

[0010] As a further description of the above technical solution: the gasket body also includes a pair of austenitic steel plates, which are respectively fixedly disposed on the outside of a pair of martensitic steel plates.

[0011] As a further description of the above technical solution: the thickness of the austenitic steel plate is less than the thickness of the martensitic steel plate.

[0012] As a further description of the above technical solution: the gasket body is provided with multiple positioning holes.

[0013] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0014] 1. The first sealing component makes it difficult for oil at the cylinder bore to flow out of the cylinder. The second sealing component can compensate for the uneven deformation of the gasket body through local plastic deformation in a high-temperature environment. High temperature will trigger the sealing effect of the gasket to a large extent. Under high temperature, the expansion rate of the internal material of the dynamic sealing component causes it to undergo a large degree of non-plastic deformation, actively pressing the inside of the gasket body. It performs dynamic sealing with the working temperature of the gasket body, resulting in good sealing performance of the gasket body.

[0015] 2. The expansion of flexible graphite plates at high temperatures is far superior to that of metals, ensuring the structural stability within the gasket. The hardness of austenitic steel plates is much lower than that of martensitic steel plates, causing the outermost austenitic steel plates to deform preferentially and disperse stress under high-temperature conditions, preventing the martensitic steel plates used to bear the rigidity of the gasket body from breaking prematurely, and ensuring the high-temperature resistance of the gasket body. Attached Figure Description

[0016] Figure 1 A schematic diagram of the front view structure provided according to an embodiment of the present invention is shown;

[0017] Figure 2 A schematic diagram of the exploded structure of the gasket body provided according to an embodiment of the present invention is shown;

[0018] Figure 3 The present invention provides an embodiment of the invention. Figure 2 Enlarged diagram of point A in the middle.

[0019] Legend:

[0020] 1. Gasket body; 11. Cylinder bore; 2. Sealing ring; 3. Martensitic steel plate; 31. Sealing rib; 4. Flexible graphite plate; 41. Circular groove; 42. Fluororubber; 5. Austenitic steel plate; 6. Positioning hole. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example: This example provides a multi-layer metal sealing gasket for a diesel engine cylinder head. See [link to example]. Figures 1-3 Specifically, including the gasket body 1, it also includes: a plurality of cylinder holes 11 opened on the gasket body 1, a first sealing component for sealing the outermost side of the cylinder holes 11 on the gasket body 1, a second sealing component for improving the overall sealing effect and a dynamic sealing component for adaptive sealing inside the gasket body 1.

[0023] In this optional embodiment, the first sealing component makes it difficult for the oil at the cylinder bore 11 to flow out of the cylinder. The second sealing component can compensate for the uneven deformation of the gasket body 1 by local plastic deformation in a high-temperature environment. High temperature will trigger the sealing effect of the gasket to a large extent. Under high temperature, the expansion rate of the internal material of the dynamic sealing component causes it to produce a large degree of non-plastic deformation, actively pressing the inside of the gasket body 1. It performs dynamic sealing with the working temperature of the gasket body 1, so that the gasket body 1 has good sealing performance.

[0024] Optionally, the first sealing assembly includes a plurality of sealing rings 2, which are respectively fixedly disposed inside a plurality of cylinder bores 11;

[0025] In this optional embodiment, the sealing ring 2 seals the inside of the cylinder bore 11, making it difficult for the oil at the cylinder bore 11 to flow out of the cylinder.

[0026] Optionally, the second sealing assembly includes a pair of martensitic steel plates 3 and a plurality of sealing ribs 31, the plurality of sealing ribs 31 being fixedly disposed on both sides of the pair of martensitic steel plates 3, and the plurality of sealing ribs 31 corresponding one-to-one with the plurality of cylinder holes 11.

[0027] In this optional embodiment, the martensitic steel plate 3 is the material with the highest hardness in the gasket body 1, which improves the overall rigidity of the gasket body 1 and the durability of the gasket body 1. Traditional integral gaskets have uneven pressure distribution under thermal deformation, while the sealing ribs 31 can compensate for this unevenness through local plastic deformation in a high-temperature environment, just like placing multiple independent springs on an undulating surface. High temperature will trigger the sealing effect of the gasket to a large extent.

[0028] Optionally, the dynamic sealing assembly includes a flexible graphite plate 4, multiple circular grooves 41 and fluororubber 42. The flexible graphite plate 4 is fixedly disposed between a pair of martensitic steel plates 3. Multiple circular grooves 41 are respectively opened on both sides of the flexible graphite plate 4, and the multiple circular grooves 41 correspond one-to-one with multiple cylinder holes 11. Fluororubber 42 is respectively coated in the multiple circular grooves 41.

[0029] In this optional embodiment, the flexible graphite plate 4 can fill defects of a certain depth under high pressure, greatly reducing the leakage rate. The flexible graphite plate 4 absorbs the stress generated during assembly, protecting the sealing rib 31 from overload crushing. Moreover, the expansion of the flexible graphite plate at high temperature is far superior to that of metal, ensuring the structural stability within the gasket. Under high temperature, the expansion rate of the fluororubber 42 itself causes it to undergo a large degree of non-plastic deformation. The fluororubber 42 actively presses the graphite plate 4 and the martensitic steel plate 3 together to achieve dynamic sealing.

[0030] Optionally, the gasket body 1 also includes a pair of austenitic steel plates 5, which are respectively fixedly disposed on the outside of a pair of martensitic steel plates 3;

[0031] In this optional embodiment, the austenitic steel plate 5 has an extremely slow corrosion rate in the coolant, which can well ensure the corrosion resistance of the gasket, and the symmetrical design makes the life of both sides balanced.

[0032] Optionally, the thickness of the austenitic steel plate 5 is less than the thickness of the martensitic steel plate 3;

[0033] In this optional embodiment, the hardness of the austenitic steel plate 5 is much smaller than that of the martensitic steel plate 3, so that the outermost austenitic steel plate 5 deforms preferentially and disperses stress under high temperature conditions, avoiding premature fracture of the martensitic steel plate 3 used to bear the rigidity of the gasket body 1, and ensuring the high temperature resistance of the gasket body 1.

[0034] The gasket body 1 has multiple positioning holes 6;

[0035] In this optional embodiment, the positioning hole 6 is used to install and fix the gasket body 1.

[0036] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A multi-layer metal sealing gasket for a diesel engine cylinder head, comprising a gasket body (1), characterized in that, Also includes: The gasket body (1) has multiple cylinder holes (11) and a first sealing component for sealing the outermost cylinder hole (11). The gasket body (1) has a second sealing component for improving the overall sealing effect and a dynamic sealing component for adaptive sealing.

2. The multi-layer metal sealing gasket for a diesel engine cylinder head according to claim 1, characterized in that, The first sealing assembly includes multiple sealing rings (2), which are respectively fixedly disposed inside multiple cylinder bores (11).

3. The multi-layer metal sealing gasket for a diesel engine cylinder head according to claim 1, characterized in that, The second sealing assembly includes a pair of martensitic steel plates (3) and a plurality of sealing ribs (31). The plurality of sealing ribs (31) are respectively fixedly disposed on both sides of the pair of martensitic steel plates (3), and the plurality of sealing ribs (31) correspond one-to-one with the plurality of cylinder holes (11).

4. A multi-layer metal sealing gasket for a diesel engine cylinder head according to claim 3, characterized in that, The dynamic sealing assembly includes a flexible graphite plate (4), multiple circular grooves (41) and fluororubber (42). The flexible graphite plate (4) is fixedly disposed between a pair of martensitic steel plates (3). The multiple circular grooves (41) are respectively opened on both sides of the flexible graphite plate (4), and the multiple circular grooves (41) correspond one-to-one with multiple cylinder holes (11). The fluororubber (42) is respectively coated in the multiple circular grooves (41).

5. A multi-layer metal sealing gasket for a diesel engine cylinder head according to claim 3, characterized in that, The gasket body (1) also includes a pair of austenitic steel plates (5), which are respectively fixedly disposed on the outside of a pair of martensitic steel plates (3).

6. A multi-layer metal sealing gasket for a diesel engine cylinder head according to claim 5, characterized in that, The thickness of the austenitic steel plate (5) is less than the thickness of the martensitic steel plate (3).

7. A multi-layer metal sealing gasket for a diesel engine cylinder head according to claim 1, characterized in that, The gasket body (1) has multiple positioning holes (6).

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