High-reliability cylinder gasket structure

Abstract

The high-reliability cylinder gasket structure comprises an upper layer, a middle layer and a lower layer which are sequentially stacked from top to bottom, the upper layer is provided with a first full-wave band, the middle layer is provided with a second full-wave band, and the lower layer is provided with a third full-wave band. A first straight section is arranged on the wave top of the first full-wave band, a second straight section is arranged on the wave top of the second full-wave band, and a third straight section is arranged on the wave top of the third full-wave band; the upper part of the second straight section is matched with the first straight section; the lower part of the second straight section is matched with the third straight section; the first half-wave band is arranged on the lower layer and is bent upwards; and a first limiting layer matched with a horizontal section of the first half-wave band which is bent upwards is arranged at the lower part of the body of the middle layer. Original line contact of a full-wave part is changed into surface contact, so that contact stress is greatly reduced, fatigue crack of the gasket is prevented, and the gasket is prevented from pressing out a pit on a sealing surface to affect the sealing effect.

Description

Technical Field

[0001] The utility model belongs to the technical field of engines, and particularly relates to a cylinder gasket structure with high reliability. Background Art

[0002] Existing engine cylinder head gaskets utilize a circular full-wave structure to increase sealing line pressure. This creates a line contact when the gasket is compressed. This line contact presents two significant drawbacks. The gasket's inherent contact stress is high, making fatigue cracking more likely to occur at the rounded corners. Furthermore, if the full-wave projections are adjusted outward, the full wave can easily create indentations on the sealing surfaces at both ends, affecting the roughness of the sealing surface. This structure results in high structural stress and an insufficient fatigue safety factor, posing a risk of cylinder head gasket cracking.

[0003] When the full-wave bulge faces outward, a non-compression-wave protective layer is added to the outer layer to prevent the full wave from indenting the sealing surface. However, the addition of this non-compression-wave protective layer significantly reduces the sealing force, making it more likely for air leakage to impact the cylinder head gasket. This structure has low sealing force and poses a greater risk of air leakage impacting the cylinder head gasket when the explosion pressure increases or when the heat is heated and the cold is cooled. Utility Model Content

[0004] The utility model provides a cylinder gasket structure with high reliability. A section of the full wave is a straight section tangent to the circular arc. The full wave part changes from the original line contact to surface contact, thereby greatly reducing the contact stress to prevent the gasket from fatigue cracking and preventing the gasket from pressing pits on the sealing surface to affect the sealing effect, thereby improving reliability.

[0005] To achieve the above-mentioned purpose, the utility model provides a high-reliability cylinder gasket structure, comprising an upper layer, a middle layer and a lower layer stacked in sequence from top to bottom, the upper layer is provided with a first full-wave band, the middle layer is provided with a second full-wave band, the lower layer is provided with a third full-wave band, the wave top on the first full-wave band is provided with a first straight segment, the wave top on the second full-wave band is provided with a second straight segment, and the wave top on the third full-wave band is provided with a third straight segment. In the utility model, the wave top is the peak or the trough, and the full wave in the utility model refers to the entire wave band from rising to falling, that is, the left and right ends of the full wave have the same height, and the half wave is from the starting point of the wave band to the peak, and the left and right ends of the half wave are not equal in height.

[0006] The upper part of the second straight segment cooperates with the first straight segment, and the lower part of the second straight segment cooperates with the third straight segment; this structure is a second seal, and the tops of the three full waves add the first straight segment, the second straight segment and the third straight segment tangent to the arc. After compression, the full-wave parts change from the original line contact to surface contact, which greatly reduces the contact stress.

[0007] The present invention also includes a first half-wave segment disposed in the lower layer and bent upward, and a first limiting layer is disposed on the lower portion of the intermediate layer's main body, cooperating with the horizontal segment of the first half-wave segment bent upward. This structure forms a first seal, and the limiting layer cooperates with the horizontal segment at the top of the first half-wave segment to significantly reduce internal pressure and pulse pressure. The half-wave can provide a certain degree of sealing compensation through compression deformation, providing better boundary conditions for the second seal. At the same time, the limiting layer of the first seal ensures that the second seal is not over-compressed and maintains good elasticity. The gasket can no longer be compressed beyond the thickness of the first limiting layer, ensuring that the four full waves do not experience permanent deformation and maintain good resilience.

[0008] Preferably, the intermediate layer is constructed as a double-layer structure, with the second full-wave band comprising an upper full-wave band and a lower full-wave band arranged in pairs. The double-layer structure effectively comprises four full-wave structures, achieving a second seal. This provides excellent sealing compensation, can cope with varying pressure changes and thermal expansion and contraction, and provides a stable sealing force.

[0009] Preferably, the system also includes a second half-wave segment, positioned above the intermediate layer and bent upward. A second limiting layer, positioned below the main body of the upper layer, cooperates with the horizontal section of the second half-wave segment that bends upward. The use of two limiting layers significantly reduces internal pressure and pulse pressure, providing improved boundary conditions for the second seal.

[0010] The first full-wave band and the third full-wave band are both concave toward the middle layer, that is, the upper layer and the lower layer are both concave toward the middle layer, which reduces contact stress. When the full wave faces outward, there is no need to increase the cost of the protective layer, and the sealing effect is better.

[0011] The first limiting layer and the second limiting layer of the utility model are both limiting layers without pressure waves. They are rigid structures and are incompressible. They can greatly reduce the internal pressure and pulse pressure. The half-wave can provide a certain sealing compensation through compression deformation. The limiting layer increases the sealing force while limiting the compression amount of the second seal, preventing the second sealing pressure wave from being over-compressed and permanently deformed due to excessive compression force.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] The full wave is provided with a straight section tangent to the arc. When the gasket is pressed and sealed, the full wave parts between the gaskets change from the original line contact to surface contact, thereby greatly reducing the contact stress and preventing the gasket from fatigue cracking, and preventing the gasket from pressing pits on the sealing surface to affect the sealing effect. The contact stress is reduced and there is no need to increase the cost of the protective layer when the full wave faces outward, and the sealing effect is better.

[0014] The first seal can significantly reduce the internal pressure and pulse pressure, providing better boundary conditions for the second seal. At the same time, the limiting layer of the first seal ensures that the second seal is not over-compressed and maintains good elasticity.

[0015] The second seal is a four-wave structure with good sealing compensation. It can cope with different pressure changes and thermal expansion and contraction, and provide stable sealing force.

[0016] The sealing force and fatigue safety factor are improved, with good sealing effect and no risk of gasket cracking or concave sealing surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of the old solution 1 in the prior art.

[0018] Figure 2 It is a structural diagram of the old solution 2 in the prior art.

[0019] Figure 3 It is a structural schematic diagram of a high-reliability cylinder gasket structure described in the utility model.

[0020] In the figure: 1-upper layer, 101-first full band, 102-first straight segment, 2-middle layer, 201-second full band, 202-second straight segment, 203-second half band, 3-lower layer, 301-third full band, 302-third straight segment, 303-first half band, 4-first limiting layer, 5-second limiting layer, 6-protective layer. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0022] In the description of the present invention, it should be understood that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or structure referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0023] Example 1:

[0024] like Figure 3As shown, a high-reliability cylinder gasket structure includes an upper layer 1, an intermediate layer 2 and a lower layer 3 stacked in sequence from top to bottom, the upper layer 1 is provided with a first full-wave band 101, the intermediate layer 2 is provided with a second full-wave band 201, and the lower layer 3 is provided with a third full-wave band 301. The first straight segment 102 is provided on the wave top of the first full-wave band 101, the second straight segment 202 is provided on the wave top of the second full-wave band 201, and the third straight segment 302 is provided on the wave top of the third full-wave band 301; the upper part of the second straight segment 202 cooperates with the first straight segment 102, and the lower part of the second straight segment 202 cooperates with the third straight segment 302; it also includes a first half-wave band 303 arranged on the lower layer 3 and bent upward, and the lower part of the main body of the intermediate layer 2 is provided with a first limiting layer 4 that cooperates with the horizontal segment after the first half-wave band 303 is bent upward.

[0025] In this embodiment, the first limiting layer 4 and the first half-wave band 303 are combined to form a first seal, and the four full-wave structures that are matched with each other form a second seal.

[0026] In this embodiment, a straight section tangent to the arc is added to the four full waves of the cylinder gasket. After compression, the full-wave parts change from the original line contact to surface contact, which greatly reduces the contact stress.

[0027] In this embodiment, the first seal can significantly reduce the internal pressure and pulse pressure, providing better boundary conditions for the second seal. The gasket can be compressed to the thickness of the first limiting layer 4 at most and cannot be further compressed, ensuring that the four full waves do not undergo permanent deformation and maintain good resilience.

[0028] Example 2: A cylinder head gasket structure with high reliability.

[0029] This embodiment is intended to solve the problems existing in the prior art. Figure 1 As shown, after tightening, the contact is linear, which presents two serious flaws. The gasket's own contact stress is high, making fatigue cracking more likely at the rounded corners. If the full-wave projections are adjusted outward, the full-wave configuration can easily create indentations on the sealing surfaces at both ends, affecting the roughness of the sealing surface. This structure exhibits high structural stress and an insufficient fatigue safety factor, posing a risk of gasket cracking.

[0030] The old solution of the prior art is as follows Figure 2 As shown, when the full-wave convexity faces outward, a non-compression-wave protective layer 6 is provided on the outer layer to prevent the full-wave from pressing into the sealing surface. However, the addition of the non-compression-wave protective layer significantly reduces the sealing force, making it easy for air leakage to hit the cylinder head gasket. This structure has low sealing force and poses a high risk of air leakage hitting the cylinder head gasket when the explosion pressure increases or when the heat is heated and the cold is cooled.

[0031] like Figure 3As shown, this embodiment provides a high-reliability cylinder gasket structure, including an upper layer 1, an intermediate layer 2 and a lower layer 3 stacked in sequence from top to bottom, the upper layer 1 is provided with a first full-wave band 101, the intermediate layer 2 is provided with a second full-wave band 201, and the lower layer 3 is provided with a third full-wave band 301. The first straight segment 102 is provided on the wave top of the first full-wave band 101, the second straight segment 202 is provided on the wave top of the second full-wave band 201, and the third straight segment 302 is provided on the wave top of the third full-wave band 301; the upper part of the second straight segment 202 cooperates with the first straight segment 102, and the lower part of the second straight segment 202 cooperates with the third straight segment 302; this structure is a second-line seal, and the tops of the three full waves are increased with the first straight segment 102, the second straight segment 202 and the third straight segment 302 tangent to the arc. After compression, the full-wave parts change from the original line contact to surface contact, which greatly reduces the contact stress.

[0032] The present invention also includes an upwardly bent first half-wave segment 303, disposed within the lower layer 3. A first limiting layer 4 is provided at the lower portion of the intermediate layer 2, cooperating with the upwardly bent horizontal section of the first half-wave segment 303. This structure forms the primary seal. The limiting layer, in conjunction with the upper horizontal section of the first half-wave segment 303, significantly reduces internal pressure and pulse pressure. The compression deformation of the half-wave provides a degree of sealing compensation, creating a better boundary condition for the secondary seal. Furthermore, the limiting layer of the primary seal ensures that the secondary seal is not excessively compressed, maintaining good elasticity.

[0033] In this embodiment, the middle layer 2 is constructed as a double-layer structure, and the second full-wave band 201 includes an upper full-wave band and a lower full-wave band arranged in pairs. The middle layer 2 is constructed as a double-layer structure, and the structure is actually four full-wave structures to achieve the second seal.

[0034] This embodiment also includes a second half-wavelength band 203, which is positioned above the middle layer 2 and folded upward. A second limiting layer 5 is provided below the main body of the upper layer 1, aligning with the horizontal section of the second half-wavelength band 203. In this embodiment, both the first full-wavelength band 101 and the third full-wavelength band 301 are recessed into the middle layer 2. This reduces contact stress, eliminating the need for additional protective layers when the full-wavelength band faces outward, and provides a more effective seal.

[0035] In this embodiment, the first limiting layer 4 and the second limiting layer 5 are both limiting layers without pressure waves, and are rigid structures and incompressible, to prevent the second sealing pressure wave from being over-compressed and permanently deformed due to excessive pressing force.

[0036] Specifically, the first limiting layer 4 extends leftward to the bending starting point of the first half-wave band 303. Similarly, the second limiting layer 5 extends leftward to the bending starting point of the second half-wave band 203, which is beneficial to reducing the compression deformation of the half-wave band.

[0037] In this embodiment, the first limiting layer 4 is disposed below the second limiting layer 5 .

[0038] This embodiment of the cylinder head gasket is used for engine sealing. Its half-wave structure, combined with the limiting layer, forms the gasket's first seal. This first seal significantly reduces internal pressure and pulse pressure, providing improved boundary conditions for the second seal. The first seal consists of a simple half-wave structure and a limiting layer without pressure waves. The half-wave provides a certain degree of sealing compensation through compression deformation. The limiting layer increases sealing force while also limiting the compression of the second seal, preventing the second seal's pressure wave from excessive compression and permanent deformation due to excessive pressure.

[0039] The second seal is composed of four opposing full-waves. Protected by the limiting layer of the first seal, the gasket can only be compressed to the thickness of the limiting layer, ensuring that the four full-waves do not permanently deform and maintain good resilience. Because the second seal consists of four full-wave structures, it has good sealing compensation, can cope with different pressure changes and thermal expansion and contraction, and provide stable sealing force. To address the problem of high contact stress between full-waves, this cylinder gasket has an additional straight section tangent to the arc. After compression, the full-wave area changes from line contact to surface contact, significantly reducing contact stress.

[0040] The following table compares the simulation calculation results of the old solution 1, the old solution 2 and the present embodiment in the prior art. It can be seen that the sealing force and fatigue safety factor of the present embodiment are greatly improved, the sealing effect is better, and the service life is longer.

[0041] project Old Plan 1 Old Plan 2 This embodiment Sealing force line (pressure) N / mm 74.5 84.1 106.7 Fatigue safety factor 1.1 0.96 1.27

Claims

1. A high-reliability cylinder head gasket structure, comprising an upper layer (1), an intermediate layer (2) and a lower layer (3) stacked in sequence from top to bottom, characterized in that: The upper layer (1) is provided with a first full-wave band (101), the middle layer (2) is provided with a second full-wave band (201), and the lower layer (3) is provided with a third full-wave band (301); a first straight segment (102) is provided on the wave crest of the first full-wave band (101), a second straight segment (202) is provided on the wave crest of the second full-wave band (201), and a third straight segment (302) is provided on the wave crest of the third full-wave band (301); the upper part of the second straight segment (202) cooperates with the first straight segment (102), and the lower part of the second straight segment (202) cooperates with the third straight segment (302); and the upper part of the second straight segment (202) cooperates with the third straight segment (302); and the upper part of the second straight segment (303) is provided on the lower layer (3) and bent upwards, and the lower part of the main body of the middle layer (2) is provided with a first limiting layer (4) that cooperates with the horizontal segment of the first half-wave band (303) bent upwards.

2. The high-reliability cylinder head gasket structure according to claim 1, characterized in that: The middle layer (2) is constructed as a double-layer structure, and the second full-band (201) comprises an upper full-band and a lower full-band arranged in pairs.

3. The high-reliability cylinder head gasket structure according to claim 1, characterized in that: It also includes a second half-wave band (203) arranged on the upper part of the middle layer (2) and bent upward, and a second limiting layer (5) is provided at the lower part of the main body of the upper layer (1) to cooperate with the horizontal section of the second half-wave band (203) bent upward.

4. The high-reliability cylinder head gasket structure according to claim 1, characterized in that: The first full-wave band (101) and the third full-wave band (301) are both arranged concavely toward the middle layer (2).

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