Housing structure and EGR valve

Abstract

The utility model provides a kind of shell structure and EGR valve, it is related to valve equipment technical field, including valve seat and valve cover, valve seat includes shaft cavity, the control cavity of one end of intercommunication shaft cavity, the installation port being set on valve seat and intercommunication control cavity, and the first connecting surface being set around installation port, along the axial direction of shaft cavity, the projection of shaft cavity is located in the projection of installation port inside;Valve cover is detachably connected valve seat, valve cover includes second connecting surface, in the butt joint state of second connecting surface and first connecting surface, valve cover can be covered on installation port.The extension of shaft cavity in axial direction in the utility model can penetrate installation port, drive shaft assembly can be directly inserted into the shaft cavity of valve seat along axial direction, and assembly can be completed, assembly step is reduced, and assembly difficulty is reduced, especially suitable for EGR valve and other valve devices needing high assembly precision and compact structure, significantly improve overall assembly efficiency and compact structure.

Description

Technical Field

[0001] This utility model relates to the field of valve equipment technology, and in particular to a housing structure and an EGR valve. Background Technology

[0002] The EGR valve (Exhaust Gas Recirculation valve), a key component of the engine emission control system, is typically installed between the engine's exhaust and intake systems. Its main function is to reintroduce a portion of the exhaust gas into the combustion chamber for secondary combustion, effectively reducing emissions of harmful substances such as nitrogen oxides (NOx) and carbon dioxide (CO2). Furthermore, the EGR valve plays a positive role in optimizing the combustion process, for example, by introducing inert gases to lower combustion temperature, increasing the compression ratio to prevent knocking, and improving fuel economy to some extent. With increasingly stringent global automotive emission standards, the application of EGR valves in engine systems is becoming more widespread, serving as an important technical means to improve both the environmental and power performance of engines.

[0003] However, despite the significant role of EGR valves in environmental protection and energy conservation, existing EGR valve designs still have many shortcomings in practical applications, particularly in terms of structural compactness. In current EGR valve designs, the connecting parts used to transmit driving force often employ conventional cam and gear connections, resulting in a large vertical space occupation and increased valve cover height, making the overall EGR valve too large in the vertical direction. This not only limits its installation flexibility within the limited engine space but also negatively impacts the optimization of the overall engine layout. Furthermore, the shaft cavity design length of some EGR valves is unreasonable; an excessively long shaft cavity causes the valve seat to occupy too much horizontal space, further increasing the overall size of the EGR valve, reducing the utilization rate of engine compartment space, and limiting the integrated optimization design of the entire vehicle system.

[0004] Existing EGR valves also face numerous technical challenges in terms of assembly efficiency and operational stability. Most EGR valves still employ traditional assembly methods, lacking flexibility in the assembly sequence and connection methods between components. For example, critical components such as the drive shaft assembly typically require insertion from the front end of the valve seat, necessitating ample operating space during assembly and demanding high assembly precision. Deviations during assembly often require disassembling multiple components for adjustment, increasing assembly time and labor costs while reducing overall production efficiency. Furthermore, some EGR valves use multiple bolts, nuts, and other fasteners for connection, resulting in complex assembly processes and a susceptibility to loose connections and misalignment, affecting product assembly quality and operational reliability. Therefore, improving the structural integration and assembly efficiency of EGR valves has become a pressing technical challenge. Utility Model Content

[0005] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a housing structure and an EGR valve to improve structural integration and assembly efficiency.

[0006] The above-mentioned objective of this utility model can be achieved by the following technical solution: this utility model provides a shell structure, including:

[0007] A valve seat, the valve seat including a shaft cavity, a control cavity communicating with one end of the shaft cavity, a mounting port disposed on the valve seat and communicating with the control cavity, and a first connecting surface disposed around the mounting port, wherein the projection of the shaft cavity is located within the projection of the mounting port along the axial direction of the shaft cavity;

[0008] A valve cover, detachably connected to the valve seat, the valve cover including a second connecting surface, wherein the second connecting surface is in a mating state with the first connecting surface, the valve cover being able to cover the mounting port.

[0009] In a preferred embodiment of the present invention, the first connecting surface is inclinedly disposed on the valve seat along the direction away from the shaft cavity.

[0010] In a preferred embodiment of the present invention, the second connecting surface is inclinedly disposed on the valve cover in a direction away from the shaft cavity.

[0011] In a preferred embodiment of the present invention, the housing structure further includes a valve body sealing structure disposed between the valve seat and the valve cover, the valve body sealing structure being used to seal the gap between the valve seat and the valve cover.

[0012] In a preferred embodiment of the present invention, the valve body sealing structure includes a valve body seal circumferentially disposed between the first connecting surface and the second connecting surface.

[0013] In a preferred embodiment of the present invention, a valve body sealing groove is provided around the second connecting surface, and the valve body sealing element includes a valve body sealing ring disposed in the valve body sealing groove. When the first connecting surface and the second connecting surface are in a mating state, the valve body sealing ring can seal against the first connecting surface.

[0014] In a preferred embodiment of the present invention, the valve seat further includes an air inlet and an air outlet communicating with the air inlet, wherein the air inlet communicates with the other end of the shaft cavity and is coaxially arranged with the shaft cavity.

[0015] In a preferred embodiment of this utility model, the air outlet is arranged along the radial direction of the shaft cavity and communicates with the air inlet.

[0016] In a preferred embodiment of the present invention, the housing structure further includes a detachable structure disposed between the valve seat and the valve cover. The detachable structure includes a plurality of mounting through holes disposed on the valve cover and penetrating the second connecting surface, a plurality of threaded sleeves disposed on the first connecting surface corresponding to the mounting through holes, and a plurality of mounting bolts for passing through the mounting through holes and threadedly connecting the threaded sleeves. The threaded sleeves are integrally disposed with the valve seat.

[0017] In a preferred embodiment of the present invention, the valve seat further includes a motor mounting cavity for accommodating a motor, the motor mounting cavity being connected to the control cavity.

[0018] This utility model also provides an EGR valve, including the aforementioned housing structure.

[0019] In a preferred embodiment of the present invention, the EGR valve includes a drive shaft assembly disposed in the shaft cavity of the housing structure, a transmission assembly disposed in the control cavity of the housing structure, and a docking member disposed between the drive shaft assembly and the transmission assembly, the docking member being used for transmission between the drive shaft assembly and the transmission assembly.

[0020] In a preferred embodiment of the present invention, the drive shaft assembly includes a protective sleeve fixedly disposed in the shaft cavity, a valve stem slidably disposed in the protective sleeve, and a valve core disposed on the valve stem for controlling the communication state between the air inlet and the air outlet.

[0021] In a preferred embodiment of the present invention, the protective sleeve is provided with a first sealing cavity and a second sealing cavity at both ends, and the EGR valve further includes a first sealing element sleeved between the protective sleeve and the valve stem and placed in the first sealing cavity, and a second sealing element sleeved between the other end of the protective sleeve and the valve stem and placed in the second sealing cavity.

[0022] In a preferred embodiment of the present invention, the protective sleeve is interference-fitted with the shaft cavity, and the protective sleeve further includes a venting cavity disposed near the second seal and at least one first vent hole communicating with the venting cavity, and the valve seat is provided with at least one second vent hole corresponding to and communicating with the first vent hole.

[0023] In a preferred embodiment of the present invention, the drive shaft assembly further includes an elastic element sleeved on the valve stem and positioned between the protective sleeve and the docking member, the elastic element being used to push the valve stem to reset.

[0024] In a preferred embodiment of the present invention, the elastic element includes a spring disposed between the protective sleeve and the mating member.

[0025] In a preferred embodiment of the present invention, the EGR valve further includes an inner liner disposed on the inner wall of the air inlet and / or the air outlet.

[0026] In a preferred embodiment of the present invention, a throat is formed on the inner liner, and the valve core includes a closed position that blocks the throat and an open position that is disengaged from the throat. The transmission assembly can drive the valve core to switch from the closed position to the open position through the docking member.

[0027] In a preferred embodiment of the present invention, the EGR valve further includes a carbon scraping assembly, which includes a carbon deposit sleeve inserted into the shaft cavity and sleeved on the valve stem. The end of the shaft cavity near the air inlet is provided with a limiting shoulder for axially limiting the carbon deposit sleeve.

[0028] In a preferred embodiment of the present invention, the carbon scraping assembly further includes a carbon scraping blade that is slidably sleeved on the valve stem and positioned between the carbon deposit sleeve and the protective sleeve.

[0029] In a preferred embodiment of the present invention, the transmission assembly includes a driven gear and a driving gear disposed in the control cavity and meshing with each other, and the mating member is tractably disposed between the driven gear and the valve stem.

[0030] In a preferred embodiment of the present invention, the EGR valve further includes a motor disposed in the motor mounting cavity of the valve seat, and the motor shaft is connected to the drive gear.

[0031] In a preferred embodiment of this utility model, the driven gear is provided with a helical involute groove, the docking member is connected to the valve stem, and the docking member is provided with a moving member, which is movably disposed in the helical involute groove.

[0032] In a preferred embodiment of the present invention, one end of the docking member is connected to the valve stem, and the other end of the docking member extends between the driven gear and the valve cover and is provided with the moving member.

[0033] In a preferred embodiment of the present invention, the docking member includes a first horizontal section connected to the valve stem, a vertical section connected to the first horizontal section, and a second horizontal section connected to the vertical section. The second horizontal section extends between the driven gear and the valve seat and is provided with the moving member.

[0034] In a preferred embodiment of the present invention, the moving part includes a bearing rotatably disposed on the mating part, and the bearing is movably disposed in the helical involute.

[0035] In a preferred embodiment of the present invention, the EGR valve further includes a displacement sensing module, which includes a sensing element disposed on the docking member and a sensor circuit disposed on the valve cover. The sensor circuit is capable of acquiring the displacement signal of the sensing element and transmitting it to the controller in real time.

[0036] In a preferred embodiment of the present invention, the sensing element is a magnet, and the docking member is provided with a receiving groove for embedding the magnet.

[0037] The technical solution of this utility model has the following significant beneficial effects:

[0038] The housing structure described in this invention, consisting of a valve seat and a valve cover, forms a valve housing. It is particularly suitable for valve devices requiring high assembly precision and compact structure, such as EGR valves (exhaust gas recirculation valves). By optimizing the connection structure between the valve seat and valve cover, the overall assembly efficiency and structural compactness are significantly improved. This invention not only solves the problems of complex valve structures, low assembly efficiency, and excessively large sizes in existing valve technologies, but also provides strong support for the development of high-performance, highly integrated valve devices, demonstrating significant technical advantages and broad application prospects.

[0039] Specifically, along the axial direction of the shaft cavity, its projection lies within the projection of the mounting port. This means the axial extension of the shaft cavity can penetrate the mounting port, thus reserving the necessary mounting position at the rear end of the valve seat. The drive shaft assembly (such as the valve stem and protective sleeve) can be directly inserted into the shaft cavity of the valve seat axially, reducing the operating space required for assembly, improving the integration of the valve seat, and making its structure more compact. Furthermore, this invention completes assembly by allowing the axial extension of the shaft cavity to penetrate the mounting port, enabling the drive shaft assembly (such as the valve stem and protective sleeve) to be directly inserted into the shaft cavity of the valve seat axially. This reduces assembly steps, lowers assembly difficulty, and improves overall assembly efficiency. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, under the guidance of this invention, can select various possible shapes and proportions to implement this invention according to specific circumstances.

[0042] Figure 1 This is a three-dimensional structural diagram of one embodiment of the shell structure described in this utility model;

[0043] Figure 2 This is a side view of one embodiment of the shell structure described in this utility model;

[0044] Figure 3 This is a side sectional view of one embodiment of the valve seat described in this utility model;

[0045] Figure 4 This is an exploded structural diagram of one embodiment of the EGR valve described in this utility model;

[0046] Figure 5 for Figure 4 A three-dimensional structural diagram of one embodiment of the drive shaft assembly and transmission assembly described herein;

[0047] Figure 6 This is a side sectional view of one embodiment of the protective sleeve described in this utility model;

[0048] Figure 7 This is a side sectional view of one embodiment of the inner liner of this utility model;

[0049] Figure 8 This is an exploded structural diagram of another embodiment of the EGR valve described in this utility model;

[0050] Figure 9 This is a side sectional view of another embodiment of the EGR valve described in this utility model;

[0051] Figure 10 for Figure 8 A three-dimensional structural diagram of the drive shaft assembly and transmission assembly described herein;

[0052] Figure 11 for Figure 8 A side view of the drive shaft assembly and transmission assembly described herein;

[0053] Figure 12 for Figure 8 The side sectional view of the mating member and the driven gear described in the figure.

[0054] The reference numerals in the above figures are as follows:

[0055] 100, Valve seat; 110, Shaft cavity; 111, Limiting shoulder; 120, Control cavity; 130, Mounting port; 140, First connecting surface; 150, Air inlet; 160, Air outlet; 170, Threaded sleeve; 180, Motor mounting cavity; 190, Second exhaust port;

[0056] 200, Valve cover; 210, Second connecting surface; 220, Valve body sealing groove; 230, Valve body seal; 240, Mounting through hole;

[0057] 300. Install bolts;

[0058] 400. Drive shaft assembly; 410. Protective sleeve; 411. First seal; 412. Second seal; 413. Vent chamber; 414. First vent; 420. Valve stem; 430. Valve core; 440. Elastic element;

[0059] 500. Transmission assembly; 510. Driven gear; 511. Helical involute; 520. Driving gear; 530. Motor;

[0060] 600. Connecting part; 610. Moving part; 601. First horizontal section; 602. Vertical section; 603. Second horizontal section;

[0061] 700, Inner Liner;

[0062] 800. Carbon scraper assembly; 810. Carbon deposit sleeve; 820. Carbon scraper blade;

[0063] 900, Displacement sensing module; 910, Sensing element; 920, Sensor circuit. Detailed Implementation

[0064] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0065] Implementation Method 1

[0066] Please refer to the following: Figures 1 to 12As shown, an embodiment of this utility model provides a housing structure, which includes a valve seat 100 and a valve cover 200. The valve seat 100 includes a shaft cavity 110, a control cavity 120 communicating with one end of the shaft cavity 110, a mounting port 130 disposed on the valve seat 100 and communicating with the control cavity 120, and a first connecting surface 140 disposed around the mounting port 130. Along the axial direction of the shaft cavity 110, the projection of the shaft cavity 110 is located within the projection of the mounting port 130. The valve cover 200 is detachably connected to the valve seat 100. The valve cover 200 includes a second connecting surface 210. The second connecting surface 210 and the first connecting surface 140 are in a mating state. The valve cover 200 can cover the mounting port 130.

[0067] Overall, the housing structure can form a valve housing through the valve seat 100 and the valve cover 200, which is particularly suitable for valve devices that require high assembly accuracy and structural compactness, such as EGR valves (exhaust gas recirculation valves). By optimizing the connection structure between the valve seat 100 and the valve cover 200, the overall assembly efficiency and structural compactness are significantly improved.

[0068] This invention not only solves the problems of complex structure, low assembly efficiency, and excessive size of valve equipment in the prior art, but also provides strong support for the development of high-performance and highly integrated valve equipment, and has significant technical advantages and broad application prospects.

[0069] In the prior art, the connecting surface on the valve seat 100 is generally parallel to the axial direction of the shaft cavity 110. Due to the size limitation of the valve seat 100, the prior art generally requires inserting the valve stem 420 of the drive shaft assembly 400 through the front end of the valve seat 100, and then inserting other components of the drive shaft assembly 400 through the rear end of the valve seat 100 for assembly. This assembly process is cumbersome and reduces overall assembly efficiency. Furthermore, in order to install other components of the drive shaft assembly 400, a large installation and operation space needs to be reserved at the rear end of the valve seat 100, which also increases the size of the valve seat 100. Moreover, when assembly deviations occur in the prior art valve seat 100, the drive shaft assembly 400 needs to be disassembled and adjusted from two directions, increasing assembly time and difficulty and reducing production efficiency.

[0070] In this utility model, such as Figure 2 , Figure 4 and Figure 8 In the embodiment shown, along the axial direction of the shaft cavity 110, the projection of the shaft cavity 110 is located within the projection of the mounting port 130, that is, the axial extension of the shaft cavity 110 can penetrate the mounting port 130, thereby reserving the required mounting position at the rear end of the valve seat 100. The drive shaft assembly 400 (such as the valve stem 420 and the protective sleeve 410) can be directly inserted into the shaft cavity 110 of the valve seat 100 along the axial direction, reducing the operating space required for assembly, helping to improve the integration of the valve seat 100, and making the structure of the valve seat 100 more compact.

[0071] Furthermore, this utility model can complete the assembly by having the shaft cavity 110 extend through the mounting port 130 in the axial direction, thereby driving the shaft assembly 400 (such as the valve stem 420 and the protective sleeve 410) to be directly inserted into the shaft cavity 110 of the valve seat 100 in the axial direction. This reduces the assembly steps, lowers the assembly difficulty, and improves the overall assembly efficiency.

[0072] In the embodiments of this utility model, such as Figure 2 and Figure 3 In the embodiment shown, the first connecting surface 140 is obliquely disposed on the valve seat 100 in a direction away from the shaft cavity 110.

[0073] By tilting the first connecting surface 140 onto the valve seat 100, the space enclosed by the first connecting surface 140 can form an inclined mounting port 130, and the axial extension of the shaft cavity 110 can penetrate the mounting port 130, thereby reserving the required mounting position at the rear end of the valve seat 100 and providing a smooth assembly path for the drive shaft assembly 400.

[0074] Designers can adjust the tilt direction of the first connecting surface 140 according to usage needs, and no specific restrictions are imposed here. Preferably, the first connecting surface 140 is tilted downwards from the horizontal. The tilt angle of the first connecting surface 140 is not specifically limited.

[0075] Of course, in other feasible embodiments, the designer may adaptively adjust the tilt direction of the first connecting surface 140 according to the structural requirements of the valve seat 100, without making specific limitations here.

[0076] In one feasible embodiment of this utility model, such as Figure 2 In the embodiment shown, the second connecting surface 210 is obliquely disposed on the valve cover 200 in a direction away from the shaft cavity 110.

[0077] By tilting the second connecting surface 210 onto the valve cover 200, the valve cover 200 can be matched and docked with the first connecting surface 140 on the valve seat 100 through the second connecting surface 210, which helps to improve the tightness of the fit and the structural stability between the valve seat 100 and the valve cover 200.

[0078] Designers can adjust the tilt direction of the second connecting surface 210 according to usage needs, and no specific restrictions are imposed here. Preferably, the second connecting surface 210 is tilted downwards from the horizontal surface. The tilt angle of the second connecting surface 210 is not specifically limited.

[0079] Of course, in other feasible embodiments, the designer may adaptively adjust the tilt direction of the first connecting surface 140 according to the first connecting surface 140, without making specific limitations here.

[0080] In another feasible embodiment of the present invention, the valve cover 200 can be tilted to form an inclined second connecting surface 210, which is not specifically limited here.

[0081] In the embodiments of this utility model, such as Figure 4 and Figure 9 In the embodiment shown, the housing structure also includes a valve body sealing structure disposed between the valve seat 100 and the valve cover 200, which can be used to seal the gap between the valve seat 100 and the valve cover 200.

[0082] In one specific embodiment, the valve body sealing structure includes a valve body seal 230 circumferentially disposed between the first connecting surface 140 and the second connecting surface 210.

[0083] The valve body seal 230 effectively seals the gap between the valve seat 100 and the valve cover 200, preventing media leakage, improving the overall sealing performance of the housing structure, and ensuring the stability and safety of the valve equipment under complex operating conditions.

[0084] Designers can adjust the specific structure of the valve body seal 230 according to usage requirements, and no specific restrictions are imposed here. Preferably, the second connecting surface 210 is provided with a valve body sealing groove 220, and the valve body seal 230 includes a valve body sealing ring disposed in the valve body sealing groove 220. The first connecting surface 140 and the second connecting surface 210 are in a mating state, and the valve body sealing ring can seal against the first connecting surface 140.

[0085] In the embodiments of this utility model, such as Figure 3 and Figure 9 In the embodiment shown, the valve seat 100 also includes an air inlet 150 and an air outlet 160 communicating with the air inlet 150. The air inlet 150 communicates with the other end of the shaft cavity 110 and is coaxially arranged with the shaft cavity 110.

[0086] Designers can adjust the specific orientation of the vent 160 according to usage requirements, and no specific restrictions are imposed here. Preferably, the vent 160 is arranged along the radial direction of the shaft cavity 110 and connects to the inlet 150.

[0087] By connecting the air inlet 150 and the air outlet 160, an airflow channel is formed, enabling efficient gas introduction and export. Furthermore, by controlling the orientation of the air inlet 150 and the air outlet 160, the internal airflow channel of the valve seat 100 is optimized, improving gas transmission efficiency and thus enhancing the working efficiency and response speed of the valve device.

[0088] In the embodiments of this utility model, such as Figure 1 , Figure 4 and Figure 8In the embodiment shown, the housing structure also includes a detachable structure disposed between the valve seat 100 and the valve cover 200. The detachable structure includes a plurality of mounting through holes 240 disposed on the valve cover 200 and penetrating the second connecting surface 210, a plurality of threaded sleeves 170 disposed on the first connecting surface 140 corresponding to the mounting through holes 240, and a plurality of mounting bolts 300 for passing through the mounting through holes 240 and threadedly connecting the threaded sleeves 170. The threaded sleeves 170 are integrally disposed with the valve seat 100.

[0089] By utilizing multiple mounting bolts 300, quick assembly and disassembly between the valve cover 200 and the valve seat 100 can be achieved, improving the convenience of maintenance and repair. Furthermore, by integrating the threaded sleeve 170 with the valve seat 100, the number of parts is reduced, manufacturing costs are lowered, installation steps are simplified, and the structural strength between the threaded sleeve 170 and the valve seat 100 is enhanced.

[0090] Designers can adjust the number and arrangement of the threaded sleeve 170, mounting through hole 240, and mounting bolt 300 according to usage requirements, without specific limitations. In one feasible embodiment, four threaded sleeves 170, four mounting through holes 240, and four mounting bolts 300 are provided, arranged in a ring around the mounting opening 130 at intervals, thereby ensuring uniform connection.

[0091] In the embodiments of this utility model, such as Figure 4 and Figure 8 In the embodiment shown, the valve seat 100 also includes a motor mounting cavity 180 for accommodating the motor 530, the motor mounting cavity 180 being connected to the control cavity 120.

[0092] By providing a motor mounting cavity 180 on the valve seat 100, a motor 530 can be installed in the motor mounting cavity 180. The motor 530 can drive the transmission assembly 500, thereby driving the drive shaft assembly 400 to move.

[0093] Designers can adjust the specific configuration of the motor mounting cavity 180 according to usage needs, and no specific restrictions are imposed here. In one feasible embodiment, the motor mounting cavity 180 is generally constructed as a cylinder, and the motor mounting cavity 180 is connected to the bottom of the control cavity 120.

[0094] Implementation Method 2

[0095] Please refer to the following: Figures 1 to 12 As shown, an embodiment of this utility model discloses an EGR valve, which includes a housing structure as described in Embodiment 1. The structure and effects of this housing structure are the same as those described in Embodiment 1, and will not be repeated here.

[0096] In the embodiments of this utility model, such as Figure 4 , Figure 8 and Figure 9 The embodiment shown includes a drive shaft assembly 400 disposed in a shaft cavity 110 of a housing structure, a transmission assembly 500 disposed in a control cavity 120 of a housing structure, and a docking member 600 disposed between the drive shaft assembly 400 and the transmission assembly 500, the docking member 600 being used for transmission between the drive shaft assembly 400 and the transmission assembly 500.

[0097] The drive shaft assembly 400 plays a crucial role in controlling the opening and closing of the EGR valve, ensuring precise control of exhaust gas recirculation between the engine exhaust and intake systems, and effectively preventing valve stem 420 jamming and leakage.

[0098] The transmission assembly 500 transmits power from the motor 530, and the driving force is transmitted to the drive shaft assembly 400 via the docking member 600, thereby realizing the axial reciprocating motion of the drive shaft assembly 400. The drive shaft assembly 400 can connect or disconnect the air inlet 150 and the air outlet 160, thus controlling the on / off state of the EGR valve. Through the coordinated transmission of the transmission assembly 500 and the docking member 600, the movement stroke of the drive shaft assembly 400 can be precisely controlled, ensuring the stability and reliability of the EGR valve's opening and closing.

[0099] In this embodiment of the invention, the valve seat 100 is made of a high-strength, corrosion-resistant material to ensure its long-term stable operation in harsh working environments. As the basic supporting component of the EGR valve, the structural design and material selection of the valve seat 100 are crucial. The high-strength, corrosion-resistant material can withstand the impact and corrosion of high-temperature exhaust gases, extending the service life of the valve seat 100 and reducing maintenance and replacement costs.

[0100] The valve cover 200 and valve seat 100 cooperate to form a closed space. The first connecting surface 140 on the valve seat 100 and the second connecting surface 210 on the valve cover 200 form a certain angle with the horizontal plane after they are fitted together, thus making the mating surfaces of the valve seat 100 and valve cover 200 different from existing flat surfaces. By adopting a beveled design, the extension line of the shaft cavity 110 can extend beyond the upper end face of the valve seat 100, facilitating the installation of the shaft system within the shaft cavity 110 from the rear side of the valve seat 100, thereby achieving rear installation and improving the overall stability of the valve body.

[0101] In the embodiments of this utility model, such as Figure 4 , Figure 5 and Figure 6 In one embodiment, the drive shaft assembly 400 includes a protective sleeve 410 fixedly disposed in the shaft cavity 110, a valve stem 420 slidably disposed in the protective sleeve 410, and a valve core 430 disposed on the valve stem 420 and used to control the communication state between the air inlet 150 and the air outlet 160.

[0102] Specifically, the valve stem 420 is a standard cylindrical rod structure made of high-strength, corrosion-resistant materials, such as stainless steel or special alloys, to ensure its long-term stable operation in high-temperature, high-pressure and corrosive exhaust gas environments.

[0103] Furthermore, the length of the shaft cavity 110 is approximately one-third the length of the valve stem 420, and the adjustment of the shaft cavity 110 length provides crucial support for compact assembly. Due to the rear-mounted design, components such as the drive shaft assembly 400 can be inserted into the shaft cavity 110 from the rear of the valve seat 100 during assembly. This mounting method eliminates the need for an excessively long shaft cavity 110 to accommodate front-end insertion requirements in existing mounting methods.

[0104] Setting the length of the shaft cavity 110 to one-third of the length of the valve stem 420 not only satisfies the requirement for the valve stem 420 to reciprocate normally within the shaft cavity 110, but also significantly shortens the horizontal length of the valve seat 100. The shorter horizontal length of the valve seat 100 reduces the space occupied by the EGR valve in the horizontal direction, resulting in a more compact overall structure.

[0105] Furthermore, key components such as the transmission assembly 500 and the docking component 600 are concentrated within the control chamber 120, resulting in a more compact and rational connection and layout between the components. During assembly, the relative positions of the components are easier to control and adjust, reducing space waste caused by component dispersion and improving assembly efficiency and precision. Simultaneously, this centralized layout also facilitates the overall maintenance and repair of the EGR valve, making replacement or repair of components more convenient and faster, reducing maintenance costs and time.

[0106] As the core component of the drive shaft assembly 400, the valve stem 420's motion directly determines the opening and closing state of the EGR valve. The dimensional accuracy and surface roughness of the valve stem 420 are strictly machined to ensure its fit with components such as the protective sleeve 410 and valve core 430, and to reduce friction and wear during movement.

[0107] The protective sleeve 410 acts as a guide, thus ensuring the stability of the valve stem 420's movement. Furthermore, the valve core 430 reliably controls the on / off state between the inlet port 150 and the outlet port 160, improving the EGR valve's response speed and control accuracy.

[0108] When the valve stem 420 drives the valve core 430 to gradually open, the exhaust gas can enter the exhaust port 160 through the air inlet 150. During this process, some of the exhaust gas will enter the control chamber 120 along the gap between the valve stem 420 and the protective sleeve 410.

[0109] To solve the above-mentioned technical problems, in the embodiments of this utility model, such as Figure 6 In the embodiment shown, the protective sleeve 410 has a first sealing cavity and a second sealing cavity at both ends. The EGR valve also includes a first sealing element 411 sleeved between the protective sleeve 410 and the valve stem 420 and placed in the first sealing cavity, and a second sealing element 412 sleeved between the other end of the protective sleeve 410 and the valve stem 420 and placed in the second sealing cavity.

[0110] By setting the first seal 411 and the second seal 412, the first seal 411 and the second seal 412 can play a sealing role, which helps to reduce gas leakage into the control chamber 120 along the gap, and improves the durability and reliability of the EGR valve.

[0111] Furthermore, such as Figure 3 , Figure 4 and Figure 6 In the embodiment shown, the protective sleeve 410 is press-fitted with the shaft cavity 110. The protective sleeve 410 also includes a venting cavity 413 located near the second seal 412 and at least one first vent hole 414 communicating with the venting cavity 413. The valve seat 100 is provided with at least one second vent hole 190 corresponding to and communicating with the first vent hole 414.

[0112] By interfering with the shaft cavity 110, the protective sleeve 410 can be fixed in the shaft cavity 110, preventing the protective sleeve 410 from rotating, so that the first exhaust hole 414 and the second exhaust hole 190 can be stably connected.

[0113] Furthermore, by providing a venting chamber 413 inside the protective sleeve 410, some gas enters the venting chamber 413 through the gap between the valve stem 420 and the protective sleeve 410, and is then efficiently discharged through the first exhaust port 414 and the second exhaust port 190, thereby avoiding the accumulation of exhaust gas and corrosion, and improving the durability of the EGR valve.

[0114] Specifically, the protective sleeve 410 is made of high-strength, high-temperature-resistant material, capable of withstanding the impact of exhaust gas and temperature changes. The design of the protective sleeve 410 cleverly solves the problems of exhaust gas leakage and accumulation. Furthermore, to improve the alignment accuracy between the first exhaust port 414 and the corresponding second exhaust port 190, positioning holes can be provided on the outer wall of the protective sleeve 410 to facilitate subsequent assembly.

[0115] In the embodiments of this utility model, such as Figure 5 , Figure 10 and Figure 11 In the embodiment shown, the drive shaft assembly 400 further includes an elastic element 440 sleeved on the valve stem 420 and positioned between the protective sleeve 410 and the docking member 600, the elastic element 440 being used to push the valve stem 420 to reset.

[0116] By setting the elastic element 440, the elastic element 440 can push the valve stem 420 to reset when the drive shaft assembly 400 loses external force, ensuring that the valve stem 420 quickly returns to the initial position in the event of power failure or control system failure, thereby maintaining the default closed state of the EGR valve and preventing uncontrolled exhaust gas backflow.

[0117] In one specific embodiment, the elastic element 440 includes a spring disposed between the protective sleeve 410 and the docking member 600. Furthermore, a baffle is provided between the spring and the protective sleeve 410, with one end of the spring abutting against the baffle and the other end of the spring abutting against the docking member 600.

[0118] The spring provides a stable restoring force when the valve stem 420 loses its external driving force, allowing it to quickly return to its initial position. This ensures that the EGR valve remains closed when not in operation, preventing abnormal backflow of exhaust gas.

[0119] In the embodiments of this utility model, such as Figure 4 and Figure 7 In the illustrated embodiment, the EGR valve further includes an inner bushing 700 disposed on the inner wall of the inlet port 150 and / or the outlet port 160. Preferably, the inner bushing 700 is disposed on the inner wall of the inlet port 150 and the outlet port 160.

[0120] The inner liner 700 effectively reduces the erosion and wear on the valve body during gas flow, improves the durability of the inlet port 150 and outlet port 160, and extends the overall service life of the EGR valve.

[0121] Specifically, the inner liner 700 has a throat, and the valve core 430 includes a closed position that blocks the throat and an open position that is disengaged from the throat. The transmission assembly 500 can drive the valve core 430 from the closed position to the open position through the docking member 600.

[0122] The EGR valve achieves precise control of the gas flow channel through the cooperation between the throat and the valve core 430, ensuring good sealing performance of the valve in the closed state and preventing exhaust gas leakage; while in the open state, the valve core 430 disengages from the throat, and the gas flow cross-sectional area gradually increases, enabling efficient and precise exhaust gas recirculation.

[0123] In the embodiments of this utility model, such as Figure 5 , Figure 9 and Figure 10 In the embodiment shown, the EGR valve also includes a carbon scraping assembly 800, which includes a carbon deposit sleeve 810 that is inserted into the shaft cavity 110 and sleeved on the valve stem 420. The shaft cavity 110 is provided with a limiting shoulder 111 for axially limiting the carbon deposit sleeve 810 at one end near the air inlet 150.

[0124] Specifically, at least part of the carbon deposit cover protrudes from the outside of the shaft cavity 110, and the carbon deposit sleeve 810 gradually retracts inward and abuts against the valve stem 420 in a direction away from the shaft cavity 110.

[0125] The carbon deposit sleeve 810 can remove carbon particles and dirt from the surface of the valve stem 420 during the reciprocating motion of the valve stem 420, preventing carbon particles and dirt from accumulating between the valve stem 420 and the inner wall of the shaft cavity 110, thereby reducing the risk of valve stem 420 jamming.

[0126] Furthermore, the carbon scraping assembly 800 also includes a carbon scraping blade 820 that is slidably sleeved on the valve stem 420 and positioned between the carbon deposit sleeve 810 and the protective sleeve 410.

[0127] The carbon scraper 820 can effectively scrape off the carbon deposits adhering to the surface of the valve stem 420 during the reciprocating motion of the valve stem 420, preventing the valve stem 420 from getting stuck or moving poorly due to carbon buildup, thereby improving the working stability and reliability of the EGR valve.

[0128] Among them, the carbon deposit sleeve 810 and the carbon scraper 820 can be made of wear-resistant and high-temperature resistant materials, so that they can work effectively for a long time in harsh working environments.

[0129] In the embodiments of this utility model, such as Figure 5 , Figure 10 In one embodiment, the transmission assembly 500 includes a driven gear 510 and a driving gear 520 disposed in the control cavity 120 and meshing with each other, and a mating member 600 is tractably disposed between the driven gear 510 and the valve stem 420.

[0130] By engaging the driven gear 510 and the driving gear 520, the driving gear 520 can receive external power input and transmit it to the driven gear 510, thereby achieving efficient power output of the transmission assembly 500. Furthermore, the docking member 600 can convert the rotational motion of the driven gear 510 into the linear displacement of the valve stem 420, enabling the valve core 430 to stably switch between the closed and open positions.

[0131] Furthermore, such as Figure 4 and Figure 8 In the embodiment shown, the EGR valve also includes a motor 530 disposed in the motor mounting cavity 180 of the valve seat 100, and the shaft of the motor 530 is connected to the drive gear 520.

[0132] The motor 530 provides a stable and controllable power output, driving the drive gear 520 to operate precisely, thereby achieving precise control over the opening and closing of the valve core 430. Furthermore, the direct connection between the motor 530 and the drive gear 520 simplifies the transmission path and improves power transmission efficiency and response speed.

[0133] In the embodiments of this utility model, such as Figure 5 and Figure 12 In the embodiment shown, the driven gear 510 is provided with a spiral involute groove 511, the docking member 600 is connected to the valve stem 420, and the docking member 600 is provided with a moving member 610, which is movably disposed in the spiral involute groove 511.

[0134] By cooperating with the moving part 610 through the helical involute 511, the rotational motion of the driven gear 510 can be efficiently converted into the linear motion of the mating part 600, thereby driving the valve stem 420 to reciprocate the valve core 430 to achieve the opening or closing action. The linear characteristics of the helical involute 511 ensure the controllability of the motion and have better precision and stability.

[0135] Furthermore, by inserting the moving part 610 into the spiral involute 511, the height of both is reduced, making the overall EGR valve smaller in the vertical direction, which helps to improve the structural compactness of the EGR valve.

[0136] In the existing technology, the transmission between the driven gear 510 and the valve stem 420 is generally achieved through a cam structure, which requires the valve cover 200 to reserve a large space to avoid the cam structure, resulting in a significant increase in the height of the valve cover 200.

[0137] In one feasible embodiment of this utility model, such as Figure 4 and Figure 5 In the embodiment shown, one end of the docking member 600 is connected to the valve stem 420, and the other end of the docking member 600 extends between the driven gear 510 and the valve cover 200 and is provided with a moving member 610.

[0138] In another feasible embodiment of this utility model, such as Figure 8 , Figure 9 , Figure 10 , Figure 11 and Figure 12 In the embodiment shown, the docking member 600 includes a first horizontal section 601 connected to the valve stem 420, a vertical section 602 connected to the first horizontal section 601, and a second horizontal section 603 connected to the vertical section 602. The second horizontal section 603 extends between the driven gear 510 and the valve seat 100 and is provided with a moving member 610.

[0139] Specifically, the vertical section 602 has a through hole corresponding to the valve stem 420, and the valve stem 420 is welded to the through hole after being joined. By cooperating with the first horizontal section 601, the vertical section 602 and the second horizontal section 603, the mating part 600 is roughly in a "Z" shape, so that there is no need to reserve space on the valve cover 200 to avoid the mating part 600, which helps to reduce the overall height of the valve cover 200.

[0140] Furthermore, by setting the spiral involute 511 on the bottom surface of the driven gear 510, with the opening of the spiral involute 511 facing downwards, dust and other impurities are less likely to accumulate at the opening of the spiral involute 511 in the actual working environment of the EGR valve. This ensures the smooth sliding of the moving part 610 within the spiral involute 511, improves the stability and reliability of motion transmission, and further enhances the overall performance of the EGR valve.

[0141] Designers can adjust the specific structure of the moving part 610 according to the usage requirements, and no specific restrictions are imposed here. Preferably, the moving part 610 includes a bearing rotatably disposed on the mating part 600, and the bearing is movably disposed in the helical involute 511.

[0142] By placing the bearing in the helical involute 511, the bearing can roll along the side wall of the helical involute 511, resulting in low motion resistance, improved smoothness of motion, and guaranteed response and stability of the EGR valve.

[0143] In the embodiments of this utility model, such as Figure 9 In the embodiment shown, the EGR valve further includes a displacement sensing module 900, which includes a sensing element 910 disposed on the docking member 600 and a sensor circuit 920 disposed on the valve cover 200. The sensor circuit 920 is capable of acquiring the displacement signal of the sensing element 910 and transmitting it to the controller in real time.

[0144] Designers can adjust the specific structure and installation method of the sensing element 910 according to the usage requirements, and no specific restrictions are imposed here. In one specific embodiment, the sensing element 910 is a magnet, and the docking member 600 is provided with a receiving groove for embedding the magnet.

[0145] The sensor circuit 920 can receive the changes in the magnetic field signal generated by the displacement of the magnet and convert it into a real-time displacement signal, which is then sent to the controller. This allows the controller to more accurately control the displacement stroke of the valve stem 420, which helps to improve the response speed and control accuracy of the EGR valve during operation.

[0146] During the post-assembly process, the carbon deposit sleeve 810 and the carbon scraper 820 are first fixed on the limiting shoulder 111 of the shaft cavity 110. Then, the first seal 411 and the second seal 412 are assembled into the corresponding first and second sealing cavities of the protective sleeve 410. Then, the protective sleeve 410, the baffle, the spring, and the docking part 600 are assembled in sequence. Finally, the valve stem 420 is inserted into the shaft cavity 110 to complete the assembly of the drive shaft assembly 400.

[0147] This post-assembly method has several advantages: First, it improves assembly flexibility and precision, resulting in tighter fit and higher concentricity between components. During assembly, adjustments and optimizations can be made to each component according to actual conditions, ensuring the overall performance of the drive shaft assembly 400. Second, post-assembly facilitates later maintenance and replacement of the drive shaft assembly 400.

[0148] In the initial state, the valve core 430 is pressed tightly against the intake port 150 by the spring, sealing the intake port 150. At this time, the EGR valve is in the closed state, and exhaust gas cannot enter the combustion chamber through the EGR valve.

[0149] When the EGR valve needs to be opened, an external driving force, such as a motor 530, drives the valve stem 420 to move away from the air inlet 150, and the valve core 430 gradually moves away from the air inlet 150, so that the exhaust gas can enter the shaft cavity 110 through the air inlet 150.

[0150] During the flow of exhaust gas, some exhaust gas may attempt to enter the control chamber 120 through the gap between the valve stem 420 and the protective sleeve 410. However, since the protective sleeve 410 is provided with a venting chamber 413 and a first vent 414, this exhaust gas will flow out through the first vent 414 and the second vent 190, thereby avoiding accumulation and corrosion between the valve stem 420 and the protective sleeve 410.

[0151] Meanwhile, the carbon scraper assembly 800 promptly removes carbon particles and dirt from the surface of the valve stem 420, preventing their accumulation between the valve stem 420 and the inner wall of the shaft cavity 110. This series of designs and operating principles ensures the stability and reliability of the EGR valve during opening and closing, effectively preventing valve stem 420 jamming and leakage problems, and improving engine performance and efficiency.

[0152] When the EGR valve needs to be closed, the external driving force is removed, and the valve stem 420 gradually returns to its original position under the action of the spring and presses tightly against the intake port 150. At this time, the EGR valve is closed again, and exhaust gas cannot enter the combustion chamber through the EGR valve.

[0153] The EGR valve in this invention adopts a rear assembly structure design, which can improve the corrosion resistance of the EGR valve and avoid the failure mode of carbon deposit sleeve 810 falling off; and it does not require riveting, which improves reliability and reduces an assembly process.

[0154] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for various purposes. The term “substantially constitutes…” used to describe a combination should include the identified elements, components, parts, or steps, as well as other elements, components, parts, or steps that do not substantially affect the essential novelty of the combination. The use of the terms “comprising” or “including” to describe combinations of elements, components, parts, or steps herein also contemplates embodiments substantially constituted by such elements, components, parts, or steps.

[0155] The use of the term "may" herein is intended to indicate that any attribute described that is included by "may" is optional. Multiple elements, components, parts, or steps can be provided by a single integrated element, component, part, or step. Alternatively, a single integrated element, component, part, or step can be divided into multiple separate elements, components, parts, or steps. The use of "a" or "an" to describe an element, component, part, or step does not imply the exclusion of other elements, components, parts, or steps.

[0156] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A shell structure, characterized in that, include: A valve seat, the valve seat including a shaft cavity, a control cavity communicating with one end of the shaft cavity, a mounting port disposed on the valve seat and communicating with the control cavity, and a first connecting surface disposed around the mounting port, wherein the projection of the shaft cavity is located within the projection of the mounting port along the axial direction of the shaft cavity; A valve cover, detachably connected to the valve seat, the valve cover including a second connecting surface, wherein the second connecting surface is in a mating state with the first connecting surface, the valve cover being able to cover the mounting port.

2. The shell structure as described in claim 1, characterized in that, The first connecting surface is inclined on the valve seat in a direction away from the shaft cavity.

3. The shell structure as described in claim 1, characterized in that, The second connecting surface is inclined on the valve cover in a direction away from the shaft cavity.

4. The shell structure as described in claim 1, characterized in that, The housing structure also includes a valve body sealing structure disposed between the valve seat and the valve cover, the valve body sealing structure being used to seal the gap between the valve seat and the valve cover.

5. The shell structure as described in claim 4, characterized in that, The valve body sealing structure includes a valve body seal element circumferentially disposed between the first connecting surface and the second connecting surface.

6. The shell structure as described in claim 5, characterized in that, The second connecting surface is provided with a valve body sealing groove, and the valve body seal includes a valve body sealing ring disposed in the valve body sealing groove. When the first connecting surface and the second connecting surface are in a mating state, the valve body sealing ring can seal against the first connecting surface.

7. The shell structure as described in claim 1, characterized in that, The valve seat also includes an air inlet and an air outlet that communicates with the air inlet. The air inlet communicates with the other end of the shaft cavity and is coaxially arranged with the shaft cavity.

8. The shell structure as described in claim 7, characterized in that, The air outlet is arranged along the radial direction of the shaft cavity and is connected to the air inlet.

9. The shell structure as described in claim 1, characterized in that, The housing structure further includes a detachable structure disposed between the valve seat and the valve cover. The detachable structure includes a plurality of mounting through holes disposed on the valve cover and penetrating the second connecting surface, a plurality of threaded sleeves disposed on the first connecting surface corresponding to the mounting through holes, and a plurality of mounting bolts for passing through the mounting through holes and threadedly connecting the threaded sleeves. The threaded sleeves are integrally disposed with the valve seat.

10. The shell structure as described in claim 1, characterized in that, The valve seat also includes a motor mounting cavity for accommodating a motor, the motor mounting cavity being connected to the control cavity.

11. An EGR valve, characterized in that, Includes the shell structure as described in any one of claims 1 to 10.

12. The EGR valve as claimed in claim 11, characterized in that, The EGR valve includes a drive shaft assembly disposed in the shaft cavity of the housing structure, a transmission assembly disposed in the control cavity of the housing structure, and a docking member disposed between the drive shaft assembly and the transmission assembly, the docking member being used for transmission between the drive shaft assembly and the transmission assembly.

13. The EGR valve as claimed in claim 12, characterized in that, The drive shaft assembly includes a protective sleeve fixedly disposed in the shaft cavity, a valve stem slidably disposed in the protective sleeve, and a valve core disposed on the valve stem for controlling the communication state between the air inlet and the air outlet.

14. The EGR valve as claimed in claim 13, characterized in that, The protective sleeve has a first sealing cavity and a second sealing cavity at its two ends, respectively. The EGR valve also includes a first sealing element sleeved between the protective sleeve and the valve stem and placed in the first sealing cavity, and a second sealing element sleeved between the other end of the protective sleeve and the valve stem and placed in the second sealing cavity.

15. The EGR valve as claimed in claim 14, characterized in that, The protective sleeve is interference-fitted with the shaft cavity. The protective sleeve also includes a venting cavity located near the second seal and at least one first vent hole communicating with the venting cavity. The valve seat is provided with at least one second vent hole corresponding to and communicating with the first vent hole.

16. The EGR valve as claimed in claim 13, characterized in that, The drive shaft assembly also includes an elastic element sleeved on the valve stem and positioned between the protective sleeve and the docking member, the elastic element being used to push the valve stem to reset.

17. The EGR valve as claimed in claim 16, characterized in that, The elastic element includes a spring disposed between the protective sleeve and the mating member.

18. The EGR valve as claimed in claim 13, characterized in that, The EGR valve also includes an inner liner disposed on the inner wall of the air inlet and / or the air outlet.

19. The EGR valve as claimed in claim 18, characterized in that, The inner liner has a throat, and the valve core includes a closed position that blocks the throat and an open position that is detached from the throat. The transmission assembly can drive the valve core from the closed position to the open position through the docking member.

20. The EGR valve as claimed in claim 13, characterized in that, The EGR valve also includes a carbon scraping assembly, which includes a carbon deposit sleeve inserted into the shaft cavity and sleeved on the valve stem. The end of the shaft cavity near the air inlet is provided with a limiting shoulder for axially limiting the carbon deposit sleeve.

21. The EGR valve as claimed in claim 20, characterized in that, The carbon scraping assembly also includes a carbon scraping blade that is slidably sleeved on the valve stem and positioned between the carbon deposit sleeve and the protective sleeve.

22. The EGR valve as claimed in claim 13, characterized in that, The transmission assembly includes a driven gear and a driving gear disposed in the control cavity and meshing with each other, and the mating member is tractably disposed between the driven gear and the valve stem.

23. The EGR valve as claimed in claim 22, characterized in that, The EGR valve also includes a motor disposed in the motor mounting cavity of the valve seat, and the motor shaft is connected to the drive gear.

24. The EGR valve as claimed in claim 22, characterized in that, The driven gear is provided with a helical involute groove, the docking member is connected to the valve stem, and the docking member is provided with a moving member, which is movably disposed in the helical involute groove.

25. The EGR valve as claimed in claim 24, characterized in that, One end of the docking member is connected to the valve stem, and the other end of the docking member extends between the driven gear and the valve cover and is provided with the moving member.

26. The EGR valve as claimed in claim 24, characterized in that, The docking component includes a first horizontal section connected to the valve stem, a vertical section connected to the first horizontal section, and a second horizontal section connected to the vertical section. The second horizontal section extends between the driven gear and the valve seat and is provided with the moving component.

27. The EGR valve as claimed in claim 25 or 26, characterized in that, The moving part includes a bearing rotatably disposed on the mating part, the bearing being movably disposed in the helical involute.

28. The EGR valve as claimed in claim 12, characterized in that, The EGR valve also includes a displacement sensing module, which includes a sensing element disposed on the docking part and a sensor circuit disposed on the valve cover. The sensor circuit can be used to acquire the displacement signal of the sensing element and transmit it to the controller in real time.

29. The EGR valve as claimed in claim 28, characterized in that, The sensing element is a magnet, and the docking member is provided with a receiving groove for embedding the magnet.

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