An EGR control valve

Abstract

The utility model provides a kind of EGR control valve, including valve body, valve core subassembly and drive assembly.Valve body is separated into airflow cavity and drive cavity, airflow cavity is equipped with one air inlet channel and two air outlet channels, and is communicated by two coaxial valve holes.Valve core subassembly includes one valve rod and two valve sheets, and two valve sheets are coaxially fixed on valve rod, for synchronously opening and closing two valve holes.Drive assembly includes brushless motor and transmission part, and brushless motor drives valve rod axial movement by transmission part.The structure makes double valve sheet balanced by airflow pressure, effectively reduces airflow resistance and execution load, improves response speed and control accuracy, adapts to the demand of engine light weight, simultaneously adopts brushless motor drive, prolongs service life, and transmission part is built-in to enhance stability.

Description

Technical Field

[0001] This utility model relates to the field of engine technology, and more specifically, to an EGR control valve. Background Technology

[0002] Exhaust Gas Recirculation (EGR) systems, used in engines, are one of the core technologies in the field of automotive internal combustion engine exhaust treatment. This technology introduces a portion of the high-temperature exhaust gas produced after combustion into the intake system, allowing it to mix with fresh air and then re-enter the combustion chamber for combustion. Because the large amount of inert gases in the exhaust gas lowers the maximum combustion temperature within the combustion chamber and inhibits the formation of nitrogen oxides (NOx), EGR systems have become a key device for reducing NOx content in automotive exhaust and meeting stringent emission regulations, and are widely used in gasoline and diesel engines.

[0003] As a core control component of the EGR system, the EGR control valve's structural design directly determines the precision of exhaust gas recirculation (EGR) adjustment, thus affecting engine power performance, fuel economy, and emissions. However, existing EGR control valves generally employ a single-channel flow guide structure, a design flaw: the concentrated exhaust gas flow path within the single channel results in significant airflow resistance that the valve core must overcome when opening. This not only increases the load on the actuator but also necessitates a larger valve design, making it difficult to adapt to the current trend of lightweight and miniaturized engines. Furthermore, the high opening resistance easily leads to a lag in the control valve's response, failing to match the EGR requirements under different engine operating conditions, severely impacting the control precision of the EGR system, and potentially indirectly causing a decrease in engine power and an increase in fuel consumption. Utility Model Content

[0004] The main technical problem addressed by this application is that existing EGR control valves generally adopt a single-channel flow guiding structure, which results in high airflow resistance and high load on the actuator when the valve core is opened, making it difficult to adapt to the trend of engine lightweighting and miniaturization. In order to overcome the above-mentioned defects of the prior art, this application provides an EGR control valve.

[0005] This application provides an EGR control valve, comprising: The valve body has an internally sealed and isolated airflow chamber and a drive chamber; the airflow chamber includes an inlet airflow channel and two outlet airflow channels, the inlet airflow channel is located between the two outlet airflow channels, the inlet airflow channel is connected to the two outlet airflow channels respectively through two valve holes, and the two valve holes are coaxially arranged. A valve core assembly includes a valve stem and two valve plates; the valve stem is slidably inserted into the valve body and coaxially arranged with two valve holes, and the two ends of the valve stem are respectively located in the airflow chamber and the drive chamber; the two valve plates are coaxially fixedly connected to the valve stem body located in the airflow chamber, and the two valve plates are used to synchronously open and close the two valve holes. The drive assembly includes a brushless motor and a transmission unit; the brushless motor is fixedly mounted on the outer wall of the valve body, and the output shaft of the brushless motor is connected to the valve stem via the transmission unit to drive the valve stem to move along its own axis; the transmission unit is installed inside the drive cavity.

[0006] Compared with existing technologies, the EGR control valve disclosed in this application has the following advantages: Dual valve plates are coaxially fixed on the valve stem and open and close the two valve orifices synchronously, allowing the dual valve plates to receive equal and opposite airflow forces from the intake air passage. This balances the overall airflow pressure on the valve core assembly, solving the defects of existing EGR control valves' single-channel design, which results in high airflow resistance, high actuator load, and sluggish response. It significantly reduces airflow resistance and aligns with the trend of engine lightweighting and miniaturization. Simultaneously, the synchronous opening and closing of the dual valve orifices matches the exhaust gas recirculation requirements under different engine operating conditions, improving the control accuracy of the EGR system and thus optimizing engine power performance and fuel economy. The use of a brushless motor drive avoids the problem of brush wear in brushed motors, extending the valve's service life. Furthermore, the built-in drive chamber in the transmission unit prevents external environmental interference with the transmission structure, improving operational stability.

[0007] In one possible implementation, the airflow chamber and the drive chamber are isolated by a partition integrally formed on the valve body. The partition has a through-hole for the valve stem to pass through, and a sealing ring is disposed within the through-hole. The partition integrally formed on the valve body enhances the overall structural strength and sealing performance of the valve body, preventing structural loosening between the airflow chamber and the drive chamber. The sealing ring within the through-hole provides a dynamic seal between the valve stem and the partition, preventing high-temperature exhaust gas from the airflow chamber from seeping into the drive chamber and avoiding corrosion or damage to the drive components.

[0008] In one possible implementation, a guide sleeve is also fixed inside the perforation, and the guide sleeve is coaxially slidably sleeved on the valve stem. The guide sleeve provides guidance for the valve stem, ensuring that the valve stem slides smoothly along the axis, avoiding the problem of the double valve plates not corresponding to the valve hole due to valve stem misalignment, and improving the valve core sealing performance and exhaust gas regulation accuracy; the guide sleeve can reduce the direct friction between the valve stem and the perforation of the partition, reduce component wear, extend the service life of the valve stem, and reduce the frequency of maintenance.

[0009] In one possible implementation, a valve groove is provided in a valve hole on the valve body away from the drive chamber, and a valve seat is embedded in the valve groove for fitting the valve plate. The valve seat and the valve plate fit together to further block the exhaust gas leakage channel, significantly improve sealing reliability, and avoid engine emission exceeding standards due to exhaust gas leakage; at the same time, it improves the stability of the valve stem setting.

[0010] In one possible implementation, the transmission unit includes a swing arm and a connecting seat. The swing arm is vertically fixedly connected to the output shaft of the brushless motor. A swing shaft is provided at the end of the swing arm away from the output shaft. The swing shaft is parallel to the output shaft and rotates synchronously around it. The connecting seat has a swing groove for the swing shaft to fit into. The connecting seat is fixedly connected to the valve stem. The length direction of the swing groove is perpendicular to the axial direction of the valve stem. This transmission structure of the swing arm and connecting seat efficiently converts the rotational motion of the brushless motor into the linear motion of the valve stem. The transmission principle is simple, the structure is compact, and it is suitable for the limited space inside the valve body, meeting the requirements of miniaturization design. The length direction of the swing groove is perpendicular to the movement direction of the valve stem, ensuring the transmission of force during transmission, avoiding power loss, improving the valve core adjustment sensitivity, and solving the problem of lag in response of existing control valves.

[0011] In one possible implementation, a rotating wheel is rotatably connected to the swing shaft, and the rotating wheel rolls in contact with the wall of the swing groove. The rotating wheel converts the sliding friction between the swing shaft and the swing groove into rolling friction, significantly reducing transmission resistance and component wear, improving transmission smoothness, and reducing energy loss; the rolling contact can avoid jamming during transmission, ensuring that the valve core can still open and close stably during long-term use, extending the service life of the transmission part, and improving the overall reliability of the control valve.

[0012] In one possible implementation, a spring is fitted onto the valve stem within the drive chamber, with one end of the spring abutting against the inner wall of the drive chamber and the other end abutting against the connecting seat. The spring provides an elastic restoring force, assisting the valve stem in returning to its initial position and maintaining the valve orifice in a normally closed state.

[0013] In one possible implementation, a removable dust cover is provided on the valve wall of the valve body, and the dust cover corresponds to the drive chamber. The removable dust cover provides a convenient maintenance channel for the drive chamber, allowing for the inspection, repair, or replacement of internal components such as the transmission part, valve stem, and spring without disassembling the entire valve body, thus reducing maintenance difficulty and cost. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this application. Figure 1 ; Figure 2 This is a schematic diagram of the structure of this application. Figure 2 ; Figure 3 This is a cross-sectional view of this application; Figure 4 This is a schematic diagram of the valve core assembly. Figure 5 This is a schematic diagram of the swing arm structure; Explanation of reference numerals in the attached figures: 1. Valve body; 11. Partition; 12. Sealing ring; 13. Guide sleeve; 14. Dust cover; 2. Valve core assembly; 21. Valve stem; 22. Valve plate; 3. Drive assembly; 31. Brushless motor; 32. Transmission unit; 321. Swing arm; 3211. Swing shaft; 3212. Rotary wheel; 322. Connecting seat; 3221. Swing groove; 4. Spring; 10. Airflow chamber; 101. Inlet airflow channel; 102. Outlet airflow channel; 103. Valve hole; 1031. Valve groove; 104. Valve seat; 20. Drive chamber. Detailed Implementation

[0015] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0016] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0017] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0018] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] See Figures 1 to 5 This application discloses an EGR control valve, including: valve body 1, valve core assembly 2, and drive assembly 3.

[0020] The valve body 1 is integrally cast from a high-strength alloy material that is resistant to high temperatures and corrosion. Internally, it is sealed and isolated to form an independent airflow chamber 10 and a drive chamber 20, ensuring no airflow movement between the two chambers. The airflow chamber 10 includes an inlet passage 101 and two outlet passages 102, with the inlet passage 101 located between the two outlet passages 102. The inlet passage 101 communicates with the two outlet passages 102 respectively through two coaxially arranged valve holes 103. The diameter of the valve holes 103 is designed according to the engine's rated exhaust gas flow rate, and the axes of the two valve holes 103 coincide.

[0021] The valve core assembly 2 includes a valve stem 21 and two valve discs 22. The valve stem 21 is made of high-strength alloy material and is heat-treated to enhance its wear resistance and deformation resistance. The valve stem 21 slides through the valve body 1, and its axis coincides with the axes of the two valve holes 103 to ensure coaxiality when the valve stem 21 moves. One end of the valve stem 21 extends into the airflow chamber 10, and the other end extends into the drive chamber 20. The two valve discs 22 are made of wear-resistant material and are the same size. They are coaxially fixed (interference fit) to the valve stem 21 on the stem body located in the airflow chamber 10. The distance between the two valve discs 22 is the same as the distance between the two valve holes 103. The two valve discs 22 are located axially above the two valve holes 103 respectively, ensuring that each valve disc 22 corresponds to one valve hole 103, realizing the synchronous opening and closing of the two valve holes 103.

[0022] The drive assembly 3 includes a brushless motor 31 and a transmission unit 32. The brushless motor 31 is a torque motor adapted to the engine's operating conditions and is bolted to a pre-set mounting base on the outer wall of the valve body 1, with the motor's output shaft facing the drive cavity 20. The transmission unit 32 is integrally assembled inside the drive cavity 20. After the output shaft of the brushless motor 31 extends into the drive cavity 20, it is connected to the end of the valve stem 21 via the transmission unit 32. When the brushless motor 31 starts, the rotational motion of the output shaft is converted into linear reciprocating motion of the valve stem 21 along its own axis through the transmission unit 32, thereby driving the two valve plates 22 to synchronously open and close the two valve holes 103, achieving the regulation of exhaust gas flow. The brushless motor 31 is electrically connected to the engine's control module.

[0023] In this embodiment, the airflow chamber 10 and the drive chamber 20 are isolated by a partition 11. The partition 11 and the valve body 1 are integrally cast, eliminating the need for additional splicing and effectively enhancing the overall structural strength of the valve body 1. This prevents loosening of the connection between the partition 11 and the valve body 1 due to vibration after long-term use. A through hole for the valve stem 21 to pass through is machined in the partition 11. An annular groove is formed on the inner wall of the through hole, and a matching sealing ring 12 is embedded in the annular groove. The sealing ring 12 is made of high-temperature resistant fluororubber, and its inner diameter fits tightly with the outer diameter of the valve stem 21. When the valve stem 21 slides along the axis, the sealing ring 12 always maintains a dynamic seal with the surface of the valve stem 21, preventing high-temperature exhaust gas in the airflow chamber 10 from seeping into the drive chamber 20 and avoiding corrosion or high-temperature damage to the drive assembly 3.

[0024] In this embodiment, a guide sleeve 13 is fixedly installed inside the perforation. The guide sleeve 13 is made of wear-resistant alloy material, and its inner wall is polished, resulting in a low surface roughness. The axis of the guide sleeve 13 coincides with the axis of the perforation and the axis of the valve stem 21, and the valve stem 21 is coaxially slidably sleeved within the guide sleeve 13. The guide sleeve 13 not only provides guidance for the sliding of the valve stem 21, preventing the valve stem 21 from deviating during movement and ensuring that the double valve plate 22 is always aligned with the two valve holes 103, but also isolates the valve stem 21 from direct contact with the perforation of the partition 11, significantly reducing frictional loss during the sliding of the valve stem 21 and extending the service life of the valve stem 21.

[0025] In this embodiment, an annular valve groove 1031 is provided in the valve hole 103 on the valve body 1 away from the drive chamber 20. A valve seat 104 is embedded and fixed in the valve groove 1031. The valve plate 22 located on the valve stem 21 away from the drive assembly 3 is in contact with the valve seat 104, which enhances the stability of the valve stem 21 and further improves the sealing performance of the valve plate 22, ensuring the stable sealing of the valve core.

[0026] In this embodiment, the transmission unit 32 includes a swing arm 321 and a connecting seat 322. The swing arm 321 is made of high-strength metal and one end is vertically fixed to the output shaft of the brushless motor 31 to ensure that the swing arm 321 rotates synchronously with the output shaft. A swing shaft 3211 is fixedly connected to the end of the swing arm 321 away from the output shaft. The axis of the swing shaft 3211 is parallel to the axis of the output shaft of the brushless motor 31, and the swing shaft 3211 can rotate around the axis of the output shaft.

[0027] The connecting seat 322 is made of high-strength steel. One end of it is fixedly connected to the end of the valve stem 21 located in the drive cavity 20 via a threaded connection, and the other end has a swing groove 3221. The length direction of the swing groove 3221 is perpendicular to the axis of the valve stem 21. The end of the swing shaft 3211 away from the swing arm 321 is fitted into the swing groove 3221. When the brushless motor 31 drives the swing arm 321 to rotate, the swing shaft 3211 slides in the swing groove 3221 and pushes the connecting seat 322 to move axially, thereby driving the valve stem 21 to move along its own axis, efficiently completing the conversion of rotational motion into linear motion.

[0028] In this embodiment, a rotating wheel 3212 is rotatably connected to the end of the swing shaft 3211 that is inserted into the swing groove 3221. The rotating wheel 3212 is made of bearing steel. The outer diameter of the rotating wheel 3212 is adapted to the width of the swing groove 3221. When the swing shaft 3211 drives the rotating wheel 3212 to move within the swing groove 3221, the rotating wheel 3212 and the groove wall of the swing groove 3221 form a rolling fit. This structure converts the sliding friction between the swing shaft 3211 and the swing groove 3221 into rolling friction, which greatly reduces the frictional resistance and component wear during the transmission process, avoids transmission jamming, improves transmission smoothness and response speed, and extends the service life of the transmission part 32.

[0029] In this embodiment, a spring 4 is fitted onto the valve stem 21 located in the drive chamber 20. The spring 4 is made of stainless steel, and its elastic coefficient is set according to the movement resistance and reset requirements of the valve stem 21. Its spring force is much smaller than the opening force required by the motor after the airflow pressure is balanced. It is mainly used for power-off reset and has minimal impact on the opening load. One end of the spring 4 abuts against the inner wall of the drive chamber 20 of the valve body 1, and the other end abuts against the end face of the connecting seat 322. The spring 4 is in a pre-compressed state during assembly. When the motor stops working, the elastic restoring force of the spring 4 can assist the valve stem 21 to quickly reset to the initial position, maintaining the normally closed state of the valve orifice 103.

[0030] In this embodiment, an inspection port is provided on the side wall of the valve body 1 corresponding to the drive chamber 20, and a removable dust cover 14 is provided on the inspection port. The dust cover 14 is made of the same alloy material as the valve body 1, and a sealing structure (such as a sealing ring) is provided between the contact surface of the dust cover 14 and the valve body 1 to ensure the sealing of the drive chamber 20. When it is necessary to inspect, repair or replace the transmission part 32, valve stem 21, spring 4 and other components inside the drive chamber 20, it is only necessary to remove the dust cover 14 to operate, without disassembling the entire valve body 1, which greatly reduces the difficulty and cost of maintenance.

[0031] The working process of this control valve: The control module starts the brushless motor 31 based on the engine operating condition signal. The output shaft of the brushless motor 31 rotates, driving the swing arm 321, which is vertically fixed to it, to rotate synchronously. The swing shaft 3211 at the end of the swing arm 321 then performs a circular motion around the axis of the output shaft, forming an eccentric structure. Since the swing shaft 3211 fits in the swing groove 3221 of the connecting seat 322, and the length direction of the swing groove 3221 is perpendicular to the axial direction of the valve stem 21, the circular motion of the swing shaft 3211 is converted into the linear reciprocating motion of the connecting seat 322 along the axis of the valve stem 21.

[0032] The connecting seat 322 is fixedly connected to the valve stem 21, thereby driving the valve stem 21 to move along its own axis under the guidance of the guide sleeve 13. Two coaxial valve plates 22 are fixedly fixed to the valve stem 21 in the airflow chamber 10. The axial linear movement of the valve stem 21 causes the two valve plates 22 to synchronously approach or move away from the two coaxially arranged valve holes 103, realizing the synchronous opening or closing of the two valve holes 103, thereby regulating the flow rate of exhaust gas from the inlet airflow passage 101 through the valve holes 103 to the two outlet airflow passages 102.

[0033] When both valve plates 22 are closed, the valve plate 22 furthest from the drive assembly 3 fits tightly against the valve seat 104 in the corresponding valve hole 103, enhancing the stability of the valve stem 21 and ensuring the valve hole 103 is sealed. When the brushless motor 31 stops running due to power failure, the spring 4 assists the valve stem 21 and valve plate 22 to return to the closed position of the valve plate 22. This design allows the two valve plates 22 to withstand airflow forces of opposite directions and equal magnitude, and the valve core as a whole is balanced by airflow pressure, reducing the valve core movement resistance, actuator load, and response lag, thereby improving control accuracy and operational stability.

[0034] The beneficial effects of this application include: I. Core Structure Optimization: The design adopts a coaxial synchronous opening and closing design with dual outlet air passages 102 and dual valve plates 22. The dual valve plates 22 are subjected to equal and opposite forces from the intake air passages 101, and the valve core assembly 2 is balanced by airflow pressure. This significantly reduces airflow resistance and actuator load, adapts to the trend of engine lightweighting and miniaturization, solves the problem of response lag in existing single-channel control valves, matches the exhaust gas recirculation requirements of the engine under different operating conditions, improves the control accuracy of the EGR system, and optimizes engine power performance and fuel economy.

[0035] II. Driving and Transmission Advantages: The use of a brushless motor 31 avoids the wear defects of brushed motors and extends the service life of valve body 1; the transmission part 32 has a built-in drive cavity 20 to avoid external environmental interference and improve operational stability; the transmission structure of swing arm 321 and connecting seat 322 efficiently converts rotary motion into linear motion, and works with wheel 3212 to achieve rolling friction, reducing transmission resistance and jamming risk, reducing component wear, and improving adjustment sensitivity.

[0036] III. Sealing and Protection Performance: The integral molding of the partition 11 enhances the structural strength of the valve body 1, and the sealing ring 12 achieves dynamic sealing of the double cavity to prevent high-temperature exhaust gas from seeping into the drive cavity 20 and corroding the components; the valve plate 22 forms a seal with the valve hole 103 and the valve seat 104 to ensure the stability of the valve stem 21, block exhaust gas leakage, and ensure the emission reduction effect of nitrogen oxides.

[0037] IV. Value of Auxiliary Structures: The guide sleeve 13 ensures smooth coaxial sliding of the valve stem 21, improving sealing and adjustment accuracy; the spring 4 provides elastic buffering and reset force to avoid damage from hard contact; the removable dust cover 14 allows for maintenance without disassembling the valve body 1, reducing maintenance difficulty and cost.

[0038] In the description of the embodiments of this application, it should be noted that the terms "inner" and "outer" and other terms indicating direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0039] In the description of this application, the references to terms such as "an embodiment," "some embodiments," "in this embodiment," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0040] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An EGR control valve, characterized in that, include: The valve body has an internally sealed and isolated airflow chamber and a drive chamber; the airflow chamber includes an inlet airflow channel and two outlet airflow channels, the inlet airflow channel is located between the two outlet airflow channels, the inlet airflow channel is connected to the two outlet airflow channels respectively through two valve holes, and the two valve holes are coaxially arranged. A valve core assembly includes a valve stem and two valve plates; the valve stem is slidably inserted into the valve body and coaxially arranged with two valve holes, and the two ends of the valve stem are respectively located in the airflow chamber and the drive chamber; the two valve plates are coaxially fixedly connected to the valve stem body located in the airflow chamber, and the two valve plates are used to synchronously open and close the two valve holes. The drive assembly includes a brushless motor and a transmission unit; the brushless motor is fixedly mounted on the outer wall of the valve body, and the output shaft of the brushless motor is connected to the valve stem via the transmission unit to drive the valve stem to move along its own axis; the transmission unit is installed inside the drive cavity.

2. The EGR control valve according to claim 1, characterized in that, The airflow chamber and the drive chamber are separated by a partition, which is integrally formed on the valve body. The partition has a through hole for the valve stem to pass through, and a sealing ring is installed in the through hole.

3. The EGR control valve according to claim 2, characterized in that, A guide sleeve is also fixed inside the perforation, and the guide sleeve is coaxially and slidably sleeved on the valve stem.

4. The EGR control valve according to claim 1, characterized in that, A valve groove is provided in the valve hole on the valve body away from the drive chamber, and a valve seat is embedded in the valve groove. The valve seat is used to fit the valve plate.

5. The EGR control valve according to claim 1, characterized in that, The transmission unit includes a swing arm and a connecting seat. The swing arm is vertically fixedly connected to the output shaft of the brushless motor. A swing shaft is provided on the end of the swing arm away from the output shaft. The swing shaft is parallel to the output shaft and rotates synchronously around the output shaft. The connecting seat is provided with a swing groove for the swing shaft to be inserted. The connecting seat is fixedly connected to the valve stem. The length direction of the swing groove is perpendicular to the axial direction of the valve stem.

6. The EGR control valve according to claim 5, characterized in that, A rotating wheel is rotatably connected to the swing shaft, and the rotating wheel rolls in cooperation with the wall of the swing groove.

7. The EGR control valve according to claim 5, characterized in that, A spring is fitted on the valve stem located on the rod body of the drive cavity. One end of the spring abuts against the inner wall of the drive cavity, and the other end of the spring abuts against the connecting seat.

8. The EGR control valve according to claim 1, characterized in that, The valve body has a removable dust cover on its valve wall, and the dust cover corresponds to the drive chamber.

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