Sealing assembly of EGR (Exhaust Gas Recirculation) valve, engine and vehicle

Abstract

The invention discloses a sealing assembly of an EGR valve, an engine and a vehicle, and relates to the technical field of vehicle engines. The sealing assembly comprises a first flange, a second flange and a gasket, one end of the first flange is provided with a transition part, the other end of the first flange is used for being connected with the EGR valve, the second flange is connected with the first flange, the second flange is used for being connected with an opponent piece of the EGR valve, the gasket is located between the first flange and the second flange, the gasket is provided with a transition section, and the transition section covers the transition part. The transition section of the gasket extends into the first flange and covers the transition part, the risk that condensate water is accumulated on the transition part of the first flange and the end, facing the side of the gasket, of the first flange is small, then the corrosion speed of the first flange is reduced, and the service life of the first flange is prolonged.

Description

Technical Field

[0001] The present disclosure relates to the technical field of vehicle engines, and in particular to a sealing assembly of an EGR valve, an engine and a vehicle. Background Art

[0002] With the development of vehicle technology, relevant laws and users have higher and higher requirements on vehicle fuel consumption and exhaust emissions. The EGR (Exhaust Gas Recirculation) system introduces part of the exhaust gas into the intake duct, mixes it with fresh air, and then re-enters the cylinder for combustion, thereby reducing vehicle fuel consumption and the content of harmful substances in exhaust gas. Therefore, the EGR system is increasingly used in vehicles.

[0003] In the related art, the EGR valve and the engine intake pipe are connected through a sealing assembly consisting of an EGR valve flange, a counterpart flange and a gasket. In order to absorb the assembly tolerance of the sealing assembly, the inner diameter of the gasket is usually larger than the corresponding inner diameters of the two flanges.

[0004] The sealing assembly of the above structure causes an annular groove to be formed at the gasket. The moisture in the exhaust gas is easily condensed and accumulated in the annular groove during the flow process, which in turn causes the EGR valve flange to corrode faster and has a shorter service life. Summary of the invention

[0005] The embodiments of the present disclosure provide a sealing assembly of an EGR valve, an engine and a vehicle, which can solve the above-mentioned technical problems existing in the related technologies. The technical solution is as follows:

[0006] In a first aspect, a sealing assembly of an EGR valve is provided, the sealing assembly comprising a first flange, a second flange and a gasket;

[0007] One end of the first flange has a transition portion, and the other end of the first flange is used for connecting the EGR valve;

[0008] The second flange is connected to the first flange, and the second flange is used to connect to the counterpart of the EGR valve;

[0009] The gasket is located between the first flange and the second flange, and has a transition section, wherein the transition section covers the transition portion.

[0010] In some possible implementations, the gasket further comprises a first extension section and a second extension section which are parallel to each other, and an inclined section respectively connected to the first extension section and the second extension section;

[0011] The first extension section is connected to the transition section and abuts against the first flange;

[0012] The second extension section abuts against the second flange.

[0013] In some possible implementations, the gasket has a claw on a side facing the second flange, and the claw is engaged with the second flange.

[0014] In some possible implementations, the number of the claws is four, and the four claws are symmetrically distributed on the central axis of the second flange.

[0015] In some possible implementations, the transition portion is a chamfered structure, and a size of the chamfered structure gradually decreases in a direction from an end of the first flange close to the gasket to an end away from the gasket;

[0016] The transition section is matched with the transition portion.

[0017] In some possible implementations, an inner diameter dimension L2 of an end of the second flange close to the first flange is greater than or equal to a maximum value L1 of the chamfer structure dimension.

[0018] In some possible implementations, the first flange is made of cast aluminum, and the second flange is made of stainless steel.

[0019] In some possible implementations, the gasket is made of stainless steel.

[0020] In a second aspect, an engine is provided, the engine comprising the sealing assembly of the EGR valve as described in any one of the first aspects.

[0021] In a third aspect, a vehicle is provided, comprising the engine described in the second aspect.

[0022] The beneficial effects of the technical solution provided by the present disclosure include at least:

[0023] In the present disclosure, the gasket and the first flange are close to one end, and both have a transition section and a transition part respectively. The transition section extends into the first flange and covers the transition part. In this way, the risk of condensed water accumulation in the transition part and the end of the first flange facing the gasket is smaller, thereby reducing the corrosion rate of the first flange and extending the service life of the first flange.

[0024] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 It is an exploded schematic diagram of a sealing assembly provided in an embodiment of the present disclosure.

[0027] Figure 2 It is a partial schematic diagram of a gasket provided in an embodiment of the present disclosure.

[0028] Figure 3 It is a structural schematic diagram of a sealing assembly provided in an embodiment of the present disclosure.

[0029] Figure 4 It is a cross-sectional schematic diagram of a sealing assembly provided in an embodiment of the present disclosure.

[0030] Figure 5 It is a schematic diagram of the structure of a clamping claw provided in an embodiment of the present disclosure.

[0031] Figure 6 It is an exploded schematic diagram of a sealing assembly provided in an embodiment of the present disclosure.

[0032] Figure 7 It is a cross-sectional schematic diagram of a sealing assembly provided in an embodiment of the present disclosure.

[0033] Reference numerals:

[0034] 1. First flange; 11. Transition part;

[0035] 2. Second flange;

[0036] 3. Gasket; 3a. Claw;

[0037] 31. Transition section; 32. First extension section; 33. Second extension section; 34. Inclined section.

[0038] The above drawings show clear embodiments of the present disclosure, which will be described in more detail below. These drawings and text descriptions are not intended to limit the scope of the present disclosure in any way, but to illustrate the concepts of the present disclosure to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0039] In order to make the objectives, technical solutions and advantages of the present disclosure more clear, the embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

[0040] First, the terms that may appear in the embodiments of the present disclosure are explained.

[0041] EGR (Exhaust Gas Recirculation) system: usually composed of components such as EGR valve, EGR cooler and sensor.

[0042] The working principle of the EGR system is to reintroduce part of the exhaust gas discharged by the engine into the engine's intake system, mix it with fresh air and participate in the combustion process. By slowing down the combustion speed and reducing the pressure in the combustion chamber, the formation of nitrogen oxides (NOx) is reduced. Specifically, although the inert gases such as CO2 in the exhaust gas do not participate in the combustion, they play a cooling role in the mixture due to their high specific heat capacity, thereby reducing the combustion temperature in the cylinder and indirectly inhibiting the formation of NOx.

[0043] In the related art, the EGR valve and the engine intake pipe are sealed and connected via a sealing assembly. The sealing assembly generally includes: an EGR valve flange, a counterpart flange and a gasket. The EGR valve flange and the counterpart flange are respectively located on both sides of the gasket. The three parts are fastened and connected in a preset manner.

[0044] The EGR valve flange, the counterpart flange and the gasket all have a tubular structure. The tube is used to accommodate the passage of exhaust gas. As the exhaust gas flows through the EGR cooler or exchanges heat with parts during the flow process, the temperature of the exhaust gas gradually decreases, and the moisture in the exhaust gas gradually condenses from gas to liquid.

[0045] In order to absorb the assembly tolerance of the sealing component, the inner diameter of the gasket is usually larger than the corresponding inner diameters of the two flanges, which results in the formation of an annular groove at the gasket. Liquid condensed water is easily accumulated in the annular groove, which in turn causes the EGR valve flange to corrode faster and have a shorter service life.

[0046] The present disclosure provides a sealing assembly for an EGR valve, referring to Figure 1 As shown, the sealing assembly includes a first flange 1 , a second flange 2 and a gasket 3 .

[0047] One end of the first flange 1 has a transition portion 11, and the other end of the first flange 1 is used to connect the EGR valve. The second flange 2 is connected to the first flange 1, and the second flange 2 is used to connect the counterpart of the EGR valve. The gasket 3 is located between the first flange 1 and the second flange 2, and the gasket 3 has a transition section 31, and the transition section 31 covers the transition portion 11.

[0048] Depend on Figure 1It can be seen that the first flange 1, the second flange 2 and the gasket 3 all have a tubular structure, and the tubular structure is used to accommodate the passage of exhaust gas. Since the exhaust gas will flow through the EGR cooler or exchange heat with the first flange 1 and other parts during the flow process, the temperature of the exhaust gas will gradually decrease, and the moisture in the exhaust gas will gradually condense from gas to liquid.

[0049] In this way, at the end where the gasket 3 and the first flange 1 are close to each other, the gasket 3 has a transition section 31, the first flange 1 has a transition portion 11, the transition section 31 extends into the first flange 1 and covers the transition portion 11, and the transition portion 11 of the first flange 1 and the end portion facing the gasket side are less likely to contact condensed water, thereby reducing the corrosion rate of the first flange 1 and extending the service life of the first flange 1.

[0050] In some embodiments, the first flange 1 , the second flange 2 , and the gasket 3 all have opposing through holes, so that the three parts can be fastened together by bolts.

[0051] Bolted connection is easy to install and disassemble. No special tools or equipment are required. Installation and disassembly can be completed using conventional tools such as wrenches and screwdrivers, which facilitates the repair and replacement of one or several parts in the sealing assembly. On the other hand, bolted connection generates friction through pre-tightening force, thereby providing higher connection strength, which helps prevent leakage of vehicle exhaust gas flowing through the sealing assembly.

[0052] In some embodiments, reference Figure 2 As shown, the gasket 3 also has a first extension section 32 and a second extension section 33 which are parallel to each other and an inclined section 34 which is respectively connected to the first extension section 32 and the second extension section 33. The first extension section 32 is connected to the transition section 31 and abuts against the first flange 1, and the second extension section 33 abuts against the second flange 2.

[0053] In this way, there is a gap between the inclined section 34 and the second extension section 33 and the end of the first flange 1, and the gasket 3 has a semi-ribbed structure. The semi-ribbed sealing structure has the characteristics of small deformation and good resilience. Therefore, the gasket 3 with a semi-ribbed structure has better durability and longer service life.

[0054] In some embodiments, the gasket 3 is made of stainless steel. Stainless steel has certain elastic properties, high strength, long service life, and low cost.

[0055] However, the present disclosure is not limited thereto, and the gasket 3 may also be made of other metal materials such as alloys, and the specific selection may be based on parameters such as manufacturing cost and strength requirements.

[0056] In some embodiments, reference Figure 2 and Figure 3As shown, the gasket 3 has a claw 3 a on the side facing the second flange 2 , and the claw 3 a is engaged with the second flange 2 .

[0057] Reference Figure 5 As shown, in the natural state, the bottom of the claw 3a is bent inward, and the inwardly bent part ensures that the gasket 3 can be in an interference fit state with the second flange 2 after assembly. In this way, it can be ensured that after the gasket 3 and the second flange 2 are assembled, the clamping strength is large and the assembly is secure, avoiding the undesirable phenomenon such as the claw 3a falling off from the second flange 2 during the movement and assembly of the first flange 1, thereby improving the assembly efficiency of the sealing component.

[0058] The end of the claw 3a is bent outwards, and the outwardly bent portion reduces the difficulty of assembling the second flange 2 and the gasket 3, so that the second flange 2 can be easily inserted into the bottom of the claw 3a from different angles.

[0059] In some embodiments, reference Figure 3 As shown, there are four claws 3 a , which are symmetrically distributed along the central axis of the second flange 2 .

[0060] The four symmetrically distributed claws 3a can evenly distribute the clamping stress between the gasket 3 and the second flange 2 on each claw 3a, which can effectively avoid deformation, cracks or even disconnection of the claw 3a caused by stress concentration and improve the service life of each claw 3a.

[0061] In some embodiments, reference Figure 1 As shown, the transition portion 11 is a chamfered structure, and the size of the chamfered structure gradually decreases in the direction from the end of the first flange 1 close to the gasket 3 to the end away from the gasket 3. On the one hand, the chamfered structure can effectively prevent the accumulation of liquid condensed water in this area and slow down the corrosion rate of the first flange 1. On the other hand, the chamfered structure is relatively simple to process, and the first flange 1 can be processed and manufactured by casting and other processes.

[0062] The transition section 31 is adapted to the transition portion 11, that is, the transition section 31 is also a chamfered structure. In the direction from the end of the gasket 3 close to the first flange 1 to the end away from the first flange 1, the size of the chamfered structure gradually increases. The size of the transition section 31 is adapted to the size of the transition portion 11 to ensure that the transition section 31 is inserted into the first flange 1 and fits tightly with the transition portion 11, thereby achieving the purpose of the transition section 31 covering the transition portion 11.

[0063] In some embodiments, reference Figure 4 As shown, the inner diameter dimension L2 of the second flange 2 close to the first flange 1 is greater than or equal to the maximum value L1 of the chamfered structural dimension of the transition portion 11 .

[0064] In this way, after the transition section 31 is tightly fitted into the transition portion 11, there is no structure such as an annular groove or protrusion between the second flange 2 and the gasket 3. Since the gas in the pipe flows from the first flange 1 to the second flange 2, at this time, the end of the second flange 2 close to the gasket 3 and the end of the gasket 3 close to the second flange 2 are less likely to contact condensed water, thereby reducing the corrosion rate of the second flange 2 and the gasket 3 and extending the service life of the second flange 2 and the gasket 3.

[0065] In some embodiments, reference Figure 6 As shown, the transition portion 11 is a stepped structure, and the closer the first flange 1 is to the gasket 3, the larger the inner diameter corresponding to the stepped structure. On the one hand, the stepped structure can effectively prevent the accumulation of liquid condensed water in this area and slow down the corrosion rate of the first flange 1. On the other hand, the stepped structure can realize the rapid positioning of the first flange 1 and the gasket 3, which is convenient for improving the assembly efficiency of the first flange 1 and the gasket 3.

[0066] The structure of the transition section 31 is compatible with the structure of the transition portion 11, and the size of the transition section 31 is compatible with the size of the transition portion 11 to ensure that the transition section 31 is inserted into the first flange 1 and fits tightly with the transition portion 11, so as to achieve the purpose of the transition section 31 covering the transition portion 11.

[0067] The transition section 31 includes a fitting sub-segment and an inclined sub-segment, so that there is a gap between the inclined sub-segment and the transition portion 11 of the stepped structure. The transition section 31 has a semi-rib structure. The semi-rib sealing structure has the characteristics of small deformation and good resilience. Therefore, the transition section 31 with the semi-rib structure has better durability and longer service life.

[0068] The present disclosure does not specifically limit the transition portion 11 of the stepped structure. For example, the transition portion 11 may have a single-layer stepped structure, such as Figure 6 As shown, as another example, the transition portion 11 may have a double-layer or multi-layer stepped structure, which may be specifically matched and set according to parameters such as the size of the transition portion 11, sealing requirements, and assembly difficulty.

[0069] In some embodiments, reference Figure 7 As shown, the inner diameter dimension L2 of the second flange 2 close to the first flange 1 is greater than or equal to the maximum value L3 of the step structure dimension of the transition portion 11 .

[0070] In this way, after the transition section 31 is tightly fitted into the transition portion 11, there is no structure such as an annular groove or protrusion between the second flange 2 and the gasket 3. Since the gas in the pipe flows from the first flange 1 to the second flange 2, at this time, the end of the second flange 2 close to the gasket 3 and the end of the gasket 3 close to the second flange 2 are less likely to contact condensed water, thereby reducing the corrosion rate of the second flange 2 and the gasket 3 and extending the service life of the second flange 2 and the gasket 3.

[0071] In some embodiments, the first flange 1 is made of cast aluminum, and the second flange 2 is made of stainless steel.

[0072] The first flange 1 is made of cast aluminum. On the one hand, while ensuring that the first flange 1 and the EGR valve have a certain structural strength, the weight of the first flange 1 can be reduced, which is conducive to the pursuit of lightweight design of the vehicle and reduces the energy loss of the vehicle. On the other hand, since the price of cast aluminum raw materials is relatively low, the use of cast aluminum can also reduce the manufacturing cost of the first flange 1, thereby reducing the production cost of the vehicle and improving the market competitiveness of the vehicle.

[0073] The second flange 2 is made of stainless steel. On the one hand, stainless steel can effectively resist the corrosion of weak corrosive media (for example, condensed water) and improve the service life of the second flange 2 in the condensed water working environment; on the other hand, stainless steel can maintain high strength and stability in a high temperature environment, so that when other parts (for example, EGR cooler) fail and the exhaust gas temperature flowing through the second flange 2 is high, the second flange 2 can still work normally and avoid deformation, cracks and other adverse phenomena.

[0074] However, the present disclosure is not limited thereto, and the second flange 2 may also be made of other metal materials such as alloys, and the specific selection may be based on parameters such as manufacturing cost and strength requirements.

[0075] In some embodiments, the first flange 1 has a corrosion-resistant coating, which can further reduce the corrosion rate of the first flange 1 and extend the service life of the first flange 1 .

[0076] The present disclosure does not specifically limit the position of the corrosion-resistant coating on the first flange 1. For example, the corrosion-resistant coating may be coated on the transition portion 11 to prevent condensed water from entering through the gap between the transition portion 11 and the transition section 31 of the gasket 3 and directly contacting the transition portion 11.

[0077] In another exemplary embodiment, the corrosion-resistant coating can be coated on the end surface of the transition portion 11 and the first flange 1 near the gasket 3, so that condensed water can be prevented from entering through the gap between the transition portion 11 and the transition section 31 of the gasket 3 and accumulating between the first flange 1 and the gasket 3. If the first flange 1 is made of cast aluminum and the gasket 3 is made of stainless steel, the condensed water accumulated between the first flange 1 and the gasket 3 can promote the electrochemical reaction between the first flange 1 and the gasket 3. Cast aluminum is usually used as the negative electrode because its electrode potential is more negative and it is easier to lose electrons; while stainless steel is used as the positive electrode because its electrode potential is more positive and it is easier to accept electrons. Due to the potential difference between aluminum and stainless steel, galvanic corrosion can occur between them. In this corrosion process, the aluminum at the negative electrode will accelerate corrosion, while the stainless steel at the positive electrode may be less affected by corrosion. This galvanic corrosion phenomenon is particularly obvious at the contact point between aluminum and stainless steel, which leads to a greater degree of corrosion of the local first flange 1.

[0078] The corrosion-resistant coating covering the transition portion 11 and the end surface of the first flange 1 close to the gasket 3 can effectively prevent the formation of an electrochemical reaction between the first flange 1 and the gasket 3 .

[0079] Based on the same concept, an embodiment of the present disclosure further provides an engine, which may include a sealing assembly as described in any one of the above embodiments.

[0080] The engine also includes an EGR assembly and an engine intake pipe. The EGR assembly includes: an EGR valve, an EGR cooler and other components. The inlet of the EGR cooler is connected to the vehicle exhaust pipe, the outlet of the EGR cooler is connected to one end of the EGR valve, the first flange 1 is connected to the other end of the EGR valve, and the second flange 2 is connected to the engine intake pipe.

[0081] The EGR valve is used to control the exhaust gas intake of the EGR assembly, the EGR cooler is used to reduce the temperature of the exhaust gas flowing through it, and the sealing component ensures that the exhaust gas discharged by the EGR valve enters the engine intake pipe without leakage. Then inside the engine, the exhaust gas is mixed with fresh air and participates in the combustion process. By slowing down the combustion speed and reducing the pressure in the combustion chamber, the formation of nitrogen oxides (NOx) is reduced. Specifically, although the inert gases such as CO2 in the exhaust gas do not participate in the combustion, due to their high specific heat capacity, they play a cooling role in the mixture, thereby reducing the combustion temperature in the cylinder and indirectly inhibiting the formation of nitrogen oxides, thereby achieving the purpose of reducing vehicle fuel consumption and reducing the harmful content of exhaust gas.

[0082] Based on the same concept, an embodiment of the present disclosure further provides a vehicle, and the engine may include an engine as described in any one of the above embodiments.

[0083] The present disclosure does not specifically limit the type of vehicle, for example, sedans, buses, trucks, sport utility vehicles (SUV), etc. The vehicle can be a fuel vehicle or a hybrid electric vehicle (HEV), such as a plug-in hybrid.

[0084] In the description of this specification, the description with reference to the terms "certain embodiments", "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0085] It is to be understood that in the present disclosure, "plurality" refers to two or more than two, and other quantifiers are similar. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. The singular forms "a", "the" and "the" are also intended to include plural forms, unless the context clearly indicates other meanings.

[0086] It is further understood that the terms "first", "second", etc. are used to describe various information, but such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other, and do not indicate a specific order or degree of importance. In fact, the expressions "first", "second", etc. can be used interchangeably. For example, without departing from the scope of the present disclosure, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as the first information.

[0087] It can be further understood that the orientation or position relationship indicated by terms such as "center", "longitudinal", "lateral", "front", "rear", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present embodiment and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation.

[0088] It is further understood that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral molding; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be a direct connection without other components between the two, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

[0089] It is further understood that, although the operations are described in a specific order in the drawings in the embodiments of the present disclosure, it should not be understood as requiring the operations to be performed in the specific order shown or in a serial order, or requiring the execution of all the operations shown to obtain the desired results. In certain environments, multitasking and parallel processing may be advantageous.

[0090] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the scheme disclosed herein. The present disclosure is intended to cover any variation, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary technical means in the art that are not disclosed in the present disclosure. The specification and examples are considered to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the scope of rights.

[0091] It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the scope of the appended claims.

Claims

1. A sealing assembly for an EGR valve, characterized in that: The sealing assembly comprises a first flange (1), a second flange (2) and a gasket (3); One end of the first flange (1) has a transition portion (11), and the other end of the first flange (1) is used for connecting an EGR valve; The second flange (2) is connected to the first flange (1), and the second flange (2) is used to connect to the counterpart of the EGR valve; The gasket (3) is located between the first flange (1) and the second flange (2), and the gasket (3) has a transition section (31), and the transition section (31) covers the transition portion (11).

2. The sealing assembly according to claim 1, characterized in that: The gasket (3) further comprises a first extension section (32), a second extension section (33) which are parallel to each other, and an inclined section (34) which is respectively connected to the first extension section (32) and the second extension section (33); The first extension section (32) is connected to the transition section (31) and abuts against the first flange (1); The second extension section (33) abuts against the second flange (2).

3. The sealing assembly according to claim 1, characterized in that: The gasket (3) has a claw (3a) on the side facing the second flange (2), and the claw (3a) is clamped with the second flange (2).

4. The sealing assembly according to claim 3, characterized in that: The number of the clamping claws (3a) is four, and the four clamping claws (3a) are symmetrically distributed on the central axis of the second flange (2).

5. The sealing assembly according to claim 1, characterized in that: The transition portion (11) is a chamfered structure, and the size of the chamfered structure gradually decreases in a direction from an end of the first flange (1) close to the gasket (3) to an end away from the gasket (3); The transition section (31) is adapted to the transition portion (11).

6. The sealing assembly according to claim 5, characterized in that An inner diameter dimension L2 of an end of the second flange (2) close to the first flange (1) is greater than or equal to a maximum value L1 of the chamfer structure dimension.

7. The sealing assembly according to claim 1, characterized in that The first flange (1) is made of cast aluminum, and the second flange (2) is made of stainless steel.

8. The sealing assembly according to claim 1, characterized in that The gasket (3) is made of stainless steel.

9. An engine, characterized in that: The engine comprises a sealing assembly for an EGR valve according to any one of claims 1-8.

10. A vehicle, characterized in that: The vehicle comprises an engine as claimed in claim 9.

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