Precise exhaust gas recirculation valve with double linkage valves

Abstract

The invention belongs to the field of internal combustion engines, and provides a precise double-linkage-valve exhaust gas recirculation valve which comprises a valve body, a first valve assembly, a second valve assembly and a linkage assembly. The valve body forms an air inlet channel, a circulation channel and an exhaust channel, wherein the circulation channel and the exhaust channel communicate with the air inlet channel. The first valve assembly comprises a sealing disc and a first rotating shaft rotationally mounted on the valve body, and the sealing disc is in transmission connection with the first rotating shaft; the second valve assembly comprises a flow limiting plate and a second rotating shaft rotationally installed on the valve body, the flow limiting plate is in transmission connection with the second rotating shaft, and the second rotating shaft is parallel to the first rotating shaft; the linkage assembly comprises a linkage plate vertically connected to the first rotating shaft, a transmission disc coaxially connected to the second rotating shaft and a roller which is rotatably mounted on the transmission disc and is axially parallel to the second rotating shaft, a guide groove for accommodating the roller is formed in the linkage plate, and the guide groove extends according to a preset path and can drive the transmission disc to rotate by a preset angle.

Description

Technical Field

[0001] The present application belongs to the field of internal combustion engines, and in particular relates to a precision double-linked valve exhaust gas recirculation valve. Background Art

[0002] The exhaust gas recirculation (EGR) system reduces nitrogen oxide (NOx) emissions by redirecting part of the exhaust gas into the combustion chamber. The EGR valve, as its core actuator, needs to accurately control the exhaust gas flow and distribution ratio under highly dynamic conditions.

[0003] Traditional EGR valves mostly use a single valve structure. Although the structure is simple, it is easy to cause EGR rate fluctuations due to insufficient flow adjustment range under low load or transient conditions, affecting combustion stability. Although the dual-valve EGR valve that has emerged in recent years has improved the adjustment accuracy by independently controlling the flow of the circulation channel and the exhaust channel, it relies on electronic signals to synchronously drive two valves (such as dual motors or dual electromagnetic drives), facing problems such as response delay, complex control logic, high sensor redundancy and rising costs. Especially under harsh conditions such as high temperature and vibration, the electrical connections of electronic components are prone to poor contact, and reliability risks further restrict its practical application. Therefore, it is necessary to solve the above technical problems. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a precision double-linked valve exhaust gas recirculation valve to solve the technical problem of low reliability of EGR valves in the prior art.

[0005] To achieve the above purpose, the technical solution adopted by the present application is to provide a precision double-linked valve exhaust gas recirculation valve, including: A valve body, forming an intake passage and a circulation passage and an exhaust passage respectively connected to the intake passage; A first valve assembly, comprising a sealing disk arranged in the circulation channel and a first rotating shaft rotatably mounted on the valve body, wherein the sealing disk is drivingly connected to the first rotating shaft and can be driven by the first rotating shaft to adjust the opening of the circulation channel; A second valve assembly includes a flow restriction plate disposed in the air intake passage and a second rotating shaft rotatably mounted on the valve body, wherein the flow restriction plate is drivingly connected to the second rotating shaft and can be driven by the second rotating shaft to adjust the ratio of the gas flow obtained by the circulation passage and the exhaust passage from the air intake passage, and the second rotating shaft is parallel to the first rotating shaft; The linkage assembly includes a linkage plate vertically connected to the first rotating shaft, a transmission disc coaxially connected to the second rotating shaft, and a roller rotatably mounted on the transmission disc and axially parallel to the second rotating shaft. A guide groove for accommodating the roller is formed on the linkage plate. The guide groove extends along a predetermined path and can drive the transmission disc to rotate through a predetermined angle when the linkage plate rotates following the first rotating shaft.

[0006] Optionally, it further includes a convex ring platform coaxially arranged with the first rotating shaft and used for fixing the linkage plate. The linkage assembly further includes a magnet and a Hall sensor respectively arranged inside the convex ring platform. The magnet forms an arc shape coaxial with the convex ring platform, and the Hall sensor is arranged on the central axis of the convex ring platform and used for detecting the rotation angle of the magnet.

[0007] Optionally, the precision double-linkage valve exhaust gas recirculation valve further includes a rear cover detachably connected to the valve body. The rear cover and the valve body cooperate to form a cavity for accommodating the linkage assembly, and the Hall sensor is detachably clamped on the rear cover.

[0008] Optionally, a protruding extension arm is formed on the edge of the transmission disc protruding radially outward along itself, and the roller is rotatably mounted on the extension arm.

[0009] Optionally, the linkage assembly further includes bearings coaxially sleeved on the first rotating shaft and the second rotating shaft, and the first rotating shaft and the second rotating shaft are connected to the valve body through the bearings.

[0010] Optionally, the first valve assembly further includes a sealing sleeve connected to the inner wall of the circulation channel and used for abutting against the sealing disc.

[0011] Optionally, the flow limiting plate includes a first plate body, a third plate body, and a second plate body connected as a whole. The first plate body and the second plate body are in a tongue-shaped structure and the first plate body and the second plate body have an included angle C = 3 - 5 degrees, and there is an included angle D = 124 - 126 degrees between the second plate body and the third plate body. The first plate body and the second plate body respectively extend to the end of the intake passage and the beginning of the exhaust passage. At both ends of the third plate body axially relative to the first rotating shaft, there is at least one flat straight surface, and a notch is provided on at least one of the flat straight surfaces. When the flow limiting plate rotates following the first rotating shaft to the minimum opening degree, the flat straight surface and the notch are used to keep a set minimum ventilation volume between the circulation channel, the exhaust channel and the intake channel.

[0012] Optionally, the first valve assembly further includes a motor, a driving gear, an intermediate gear, and a driven gear that are transmissionally arranged. The convex ring platform is coaxial with the passive gear and is integrally formed at an end of the passive gear away from the sealing disk; The motor is arranged inside the valve body, the driving gear is coaxially connected to the motor shaft of the motor, the intermediate gear is a double gear arranged between the driving gear and the passive gear, and the driving gear, the intermediate gear and the passive gear form a two-stage reduction gear transmission pair, and the passive gear is coaxially connected to the first rotating shaft.

[0013] Optionally, the first valve assembly further comprises a plug connector provided on the rear cover and a power supply circuit connected between the plug connector and the motor and used for supplying power to the motor; The power supply line has a connecting spring for forming an electrical connection with the motor, the connecting spring forms a strip contact segment and an extension segment arranged parallel to the strip contact segment and spaced apart, and also forms a first bend segment, a second bend segment and a reversed curved segment connected end to end in sequence, an arc-shaped first transition portion is formed between the first bend segment and the second bend segment, the first transition portion abuts against the strip contact segment, an arc-shaped second transition portion is formed between the reversed curved segment and the second bend segment, the second transition portion is slidably connected to the extension segment, and the first transition portion is axially parallel to the second transition portion.

[0014] Optionally, the power supply circuit further comprises an extension foot connected to the rear cover; The extension foot cooperates with the back cover to form a cavity for accommodating the connecting spring, a riveting platform is formed on the extension foot, the connecting spring forms an outer folded section flat on the riveting platform, and a riveting column is formed on the back cover to rivet the connecting spring on the riveting platform.

[0015] The beneficial effects of the precision double-linkage valve exhaust gas recirculation valve provided by this application are as follows: Compared with the prior art, in the precision double-linkage valve exhaust gas recirculation valve provided by this application, since the second rotating shaft is parallel to the first rotating shaft, and since a guide groove for accommodating the roller on the transmission disk is formed on the linkage plate connected to the first rotating shaft and the guide groove extends along a predetermined path, during the process of the first rotating shaft driving the sealing disk to adjust the opening degree of the circulation channel, the preset guide groove on the linkage plate will force the roller on the transmission disk to move along a specific path, thereby driving the second rotating shaft to rotate precisely, so that the flow rate distribution ratio of the intake channel to the circulation channel and the exhaust channel is synchronously adjusted by the flow-limiting plate. This purely mechanical linkage method can not only ensure the synchronization and accuracy of the double-valve actions, but also achieve non-linear flow rate distribution through the carefully designed curved path of the guide groove, so as to perfectly match the dynamic requirements of the exhaust gas recirculation rate under different working conditions of the engine; in addition, the purely mechanical linkage design can also significantly improve the durability of the valve in high-temperature and high-vibration environments, so that the precision double-linkage valve exhaust gas recirculation valve provided in this application has quite high reliability, far superior to the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of this application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a partial structural schematic diagram of the precision double-linkage valve exhaust gas recirculation valve in the embodiment of this application; Figure 2 It is a partial structural section of the precision double-linkage valve exhaust gas recirculation valve in the embodiment of this application Figure 1 ; Figure 3 It is a partial structural section of the precision double-linkage valve exhaust gas recirculation valve in the embodiment of this application Figure 2 ; Figure 4 It is a front view structural schematic diagram of the precision double-linkage valve exhaust gas recirculation valve in the embodiment of this application; Figure 5 It is along Figure 4 The sectional view structure along the A-A line in Figure 6 It is an overall structural schematic diagram of the power supply line in the embodiment of this application; Figure 7 It is a top view structural schematic diagram of the precision double-linkage valve exhaust gas recirculation valve in the embodiment of this application; Figure 8 It is along Figure 7The cross-sectional structure diagram of the middle BB line; Figure 9 for Figure 5 A partial enlarged view of point E in the middle; Figure 10 It is a schematic diagram of the three-dimensional structure of the current limiting plate in this application.

[0018] Among them, the reference numerals in the figure are: 100, valve body; 101, air inlet channel; 102, circulation channel; 103, exhaust channel; 104, rear cover; 105, riveted column; 201, sealing disk; 202, first rotating shaft; 203, sealing sleeve; 204, motor; 205, driving gear; 206, intermediate gear; 207, driven gear; 208, plug connector; 209, connecting spring; 210, extension foot; 211, riveted platform; 291, strip contact section; 292, extension section; 293, first return bend section; 294, second return bend section; 295, reverse fold and warping section; 296, first transition section; 297, second transition section; 298, outer fold section; 301, current limiting plate; 3011, first plate body; 3012, second plate body; 3013, third plate body; 3014, flat surface; 3015, notch; 302, second rotating shaft; 401, linkage plate; 402, transmission plate; 403, roller; 404, guide groove; 405, convex ring platform; 406, magnet; 407, Hall sensor; 408, extension arm; 409, bearing. DETAILED DESCRIPTION

[0019] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0020] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0021] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0022] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0023] Please also read Figures 1 to 10 Now, a precision double-linked valve exhaust gas recirculation valve provided in an embodiment of the present application is described. The precision double-linked valve exhaust gas recirculation valve includes a valve body 100, a first valve component, a second valve component and a linkage component. Among them: The valve body 100 forms an intake channel 101 and a circulation channel 102 and an exhaust channel 103 respectively connected to the intake channel 101. In this embodiment, the intake channel 101 is used to receive the exhaust gas discharged by the engine, the circulation channel 102 is used to re-introduce the exhaust gas into the engine for recycling as needed, and the exhaust channel 103 is used to guide the excess exhaust gas to the exhaust pipe. The first valve assembly includes a sealing disk 201 arranged in the circulation channel 102 and a first rotating shaft 202 rotatably mounted on the valve body 100, the sealing disk 201 is transmission-connected to the first rotating shaft 202 and can be driven by the first rotating shaft 202 to adjust the opening of the circulation channel 102; the second valve assembly includes a flow limiting plate 301 arranged in the intake channel 101 and a second rotating shaft 302 rotatably mounted on the valve body 100, the flow limiting plate 301 is transmission-connected to the second rotating shaft 302 and can be driven by the second rotating shaft 302 to adjust the circulation channel 102 and the exhaust channel 103 from the intake channel to the exhaust pipe. The channel 101 obtains the ratio of the gas flow rate, and the second rotating shaft 302 is parallel to the first rotating shaft 202; the linkage assembly includes a linkage plate 401 vertically connected to the first rotating shaft 202, a transmission disk 402 coaxially connected to the second rotating shaft 302, and a roller 403 rotatably mounted on the transmission disk 402 and axially parallel to the second rotating shaft 302, and a guide groove 404 for accommodating the roller 403 is formed on the linkage plate 401, and the guide groove 404 extends according to a predetermined path and enables the linkage plate 401 to drive the transmission disk 402 to rotate through a predetermined angle while following the rotation of the first rotating shaft 202.

[0024] According to the above structure provided in the present embodiment, in the precision double-linkage valve exhaust gas recirculation valve provided in the present embodiment, since the second rotating shaft 302 is parallel to the first rotating shaft 202, and since the linkage plate 401 connected to the first rotating shaft 202 forms a guide groove 404 for accommodating the roller 403 on the transmission disk 402, and the guide groove 404 extends along a predetermined path, in the process in which the first rotating shaft 202 drives the sealing disk 201 to adjust the opening of the circulation channel 102, the preset guide groove 404 on the linkage plate 401 will force the roller 403 on the transmission disk 402 to move along a specific path, thereby driving the second rotating shaft 302 to rotate accurately. The limiting plate 301 synchronously adjusts the flow distribution ratio from the intake channel 101 to the circulation channel 102 and the exhaust channel 103. This purely mechanical linkage method can not only ensure the synchronization and accuracy of the dual valve actions, but also achieve nonlinear flow distribution through the carefully designed guide groove 404 curve path, thereby perfectly matching the dynamic requirements of the exhaust gas recirculation rate under different engine working conditions; in addition, the pure mechanical linkage design can also significantly improve the durability of the valve in high temperature and high vibration environments, so that the precision dual-linkage valve exhaust gas recirculation valve provided in the present application can have a very high reliability, which is far superior to the existing technology.

[0025] In another embodiment of the present application, please refer to Figures 1 to 10 The precision double-linked valve exhaust gas recirculation valve provided in this embodiment also includes a convex ring platform 405 which is coaxially arranged with the first rotating shaft 202 and is used to fix the linkage plate 401. The linkage assembly also includes a magnet 406 and a Hall sensor 407 which are respectively arranged inside the convex ring platform 405; the magnet 406 forms an arc shape coaxial with the convex ring platform 405, and the Hall sensor 407 is arranged on the central axis of the convex ring platform 405 and is used to detect the rotation angle of the magnet 406. According to the above structure provided in the present embodiment, since the Hall sensor 407 is arranged on the central axis of the convex ring platform 405, when the convex ring platform 405 follows the linkage plate 401 to rotate around the central axis of the first rotating shaft 202, the Hall sensor 407 can accurately detect the rotation angle of the first rotating shaft 202 through the magnet 406 arranged inside the convex ring platform 405. In this way, when the Hall sensor 407 feeds back the detection signal to the driving mechanism that is transmission-connected to the first rotating shaft 202, the driving mechanism can more accurately control the rotation of the first rotating shaft 202, which is conducive to further improving the reliability of the precision double-linkage valve exhaust gas recirculation valve in the present embodiment.

[0026] In another embodiment of the present application, please refer to Figures 1 to 10, the precision double-linkage valve exhaust gas recirculation valve further includes a rear cover 104 detachably connected to the valve body 100; the rear cover 104 and the valve body 100 cooperate to form a cavity for accommodating the linkage assembly, and the Hall sensor 407 is detachably clamped on the rear cover 104. According to the above structure provided in this embodiment, the rear cover 104 detachably connected to the valve body 100 and clamped with the Hall sensor 407 can not only facilitate the operator to maintain the linkage assembly, but also facilitate the operator to replace the damaged Hall sensor 407 in time, which is beneficial to further improving the reliability of the precision double-linkage valve exhaust gas recirculation valve in this embodiment.

[0027] In another embodiment of the present application, please refer to Figures 1 to 10 , an extension arm 408 is formed by the edge of the transmission disk 402 protruding radially outward along itself, and the roller 403 is rotatably installed on the extension arm 408. According to the above structure provided in this embodiment, the connecting arm formed on the transmission disk 402 can not only enable the roller 403 to better adapt to the guide groove 404, but also enable the guide groove 404 to be designed according to a more flexible path, which is beneficial to further improving the reliability of the precision double-linkage valve exhaust gas recirculation valve in this embodiment.

[0028] In another embodiment of the present application, please refer to Figures 1 to 10 , the linkage assembly further includes a bearing 409 coaxially sleeved on the first rotating shaft 202 and the second rotating shaft 302, and the first rotating shaft 202 and the second rotating shaft 302 are connected to the valve body 100 through the bearing 409. According to the above structure provided in this embodiment, the bearing 409 coaxially connected to the first rotating shaft 202 and the second rotating shaft 302 can make the first rotating shaft 202 and the second rotating shaft 302 rotate more stably and precisely, which is beneficial to further improving the reliability of the precision double-linkage valve exhaust gas recirculation valve in this embodiment.

[0029] In another embodiment of the present application, please refer to Figures 1 to 10 , the first valve assembly further includes a sealing sleeve 203 connected to the inner wall of the circulation channel 102 and used for abutting against the sealing disk 201. According to the above structure provided in this embodiment, the sealing sleeve 203 provided in the circulation channel 102 can make the opening adjustment of the circulation channel 102 more precise and the flow control more accurate by abutting against the sealing disk 201. At the same time, the sealing sleeve 203 can also be surface modified by a heat treatment process to improve the surface hardness, thereby enhancing its wear resistance and corrosion resistance, which is beneficial to further improving the reliability of the precision double-linkage valve exhaust gas recirculation valve in this embodiment.

[0030] In another embodiment of the present application, please refer to Figures 1 to 10, the flow limiting plate 301 includes a first plate body 3011, a third plate body 3013, and a second plate body 3012 that are integrally connected. The first plate body 3011 and the second plate body 3012 are in a tongue-shaped structure, and the first plate body 3011 and the second plate body 3012 have an included angle C = 3 to 5 degrees. There is an included angle D = 124 to 126 degrees between the second plate body 3012 and the third plate body 3013. As a preferred embodiment, the included angle C = 4 degrees and the included angle D = 125 degrees. Thus, when more exhaust gas needs to enter the circulation channel 102, during the process where the flow limiting plate 301 increases its opening degree relative to the circulation channel 102 (i.e., the flow limiting plate 301 rotates clockwise as shown in Figure 9 ), due to the effect of the included angle C, the second plate body 3012 can more quickly reduce the effective through-diameter of the port surface on one side of the exhaust channel 103 located in the circulation channel 102, so that more exhaust gas can be quickly guided to the circulation channel 102 to make the available exhaust gas in the circulation channel 102 sufficient. At this time, the exhaust gas finally entering the engine for reuse is completely related to the opening degree of the sealing disk 201, thereby improving the response accuracy of the exhaust gas recirculation valve of the precision double-linkage valve. Conversely, when the amount of exhaust gas to enter the recirculation is small, the flow limiting plate 301 rotates counterclockwise. At this time, the first plate body 3011 is close to the side of the end of the intake channel 101 located at the port surface of the circulation channel 102, and due to the effect of the included angle C, the second plate body 3012 still makes the exhaust channel 103 and the intake channel 101 have sufficient effective through-diameter, which is beneficial to discharging the unnecessary exhaust gas from the intake channel 101, and a high flow velocity phenomenon towards the outlet direction of the exhaust channel 103 occurs at the inlet of the exhaust channel 103, resulting in a negative pressure towards the outlet direction of the exhaust channel 103 at the inlet position of the circulation channel 102, thereby quickly reducing the amount of exhaust gas entering the circulation channel 102, and also achieving the effect of quick response.

[0031] The first plate body 3011 and the second plate body 3012 respectively extend to the end of the intake channel 101 and the head of the exhaust channel 103. Both ends of the third plate body 3013 relative to the first rotating shaft 202 have at least one flat surface 3014 in the axial direction, and a notch 3015 is provided on at least one flat surface 3014. Thus, when the flow limiting plate 301 rotates to the minimum opening degree following the first rotating shaft 202, the flat surface 3014 and the notch 3015 are used to keep a set minimum ventilation volume between the circulation channel 102 and the exhaust channel 103 and the intake channel 101. According to the above structure provided in this embodiment, the first plate body 3011 and the second plate body 3012 respectively extending to the end of the intake channel 101 and the head of the exhaust channel 103 can not only make the exhaust gas recirculation valve of the precision double-linkage valve in this embodiment form a more flexible effect of adjusting and guiding the air flow, but also ensure the set minimum ventilation volume, further improving its use reliability.

[0032] Here, further, the intake passage 101 is a tapered shape that gradually narrows towards the exhaust passage 103. In this way, on the one hand, it is beneficial to form a faster air flow speed at the end position of the intake passage 101, which is convenient for the flow limiting plate 301 to distribute the gas flow and improve the sensitivity; on the other hand, it is beneficial to reduce the size of the flow limiting plate 301, make the flow limiting plate 301 lighter, and is also beneficial to improving the control accuracy and reducing the load on the guide groove 404, further improving the reliability of the precision double-linkage valve exhaust gas recirculation valve in this embodiment.

[0033] In another embodiment of the present application, please refer to Figures 1 to 10 , the first valve assembly further includes a motor 204, a driving gear 205, an intermediate gear 206, and a driven gear 207 that are transmissionally arranged; wherein, the convex ring platform 405 is coaxial with the driven gear 207 and integrally formed at one end of the driven gear 207 away from the sealing disc 201; the motor 204 is arranged inside the valve body 100, the driving gear 205 is coaxially connected to the motor shaft of the motor 204, the intermediate gear 206 is a double gear arranged between the driving gear 205 and the driven gear 207 and forms a two-stage reduction gear transmission pair with the driving gear 205, the intermediate gear 206, and the driven gear 207, and the driven gear 207 is coaxially connected to the first rotating shaft 202. According to the above structure provided in this embodiment, the motor 204 can stably drive the first rotating shaft 202 through the two-stage reduction gear transmission pair formed by the driving gear 205, the intermediate gear 206, and the driven gear 207, which is beneficial to further improving the load capacity of the motor 204 of the precision double-linkage valve exhaust gas recirculation valve in this embodiment, and thus improving the reliability. In addition, in this embodiment, the convex ring platform 405 and the driven gear 207 are arranged as an integral structure, which is also beneficial to further improving the adjustment flexibility and accuracy of the precision double-linkage valve exhaust gas recirculation valve in this embodiment.

[0034] In another embodiment of the present application, please refer to Figures 1 to 10The first valve assembly also includes a plug connector 208 arranged on the back cover 104 and a power supply circuit connected between the plug connector 208 and the motor 204 and used to supply power to the motor 204; the power supply circuit has a connecting spring 209 for forming an electrical connection with the motor 204, the connecting spring 209 forms a strip contact segment 291 and an extension segment 292 arranged parallel to the strip contact segment 291 and spaced apart, and also forms a first bend segment 293, a second bend segment 294 and a reversed and raised segment 295 connected end to end in sequence, an arc-shaped first transition portion 296 is formed between the first bend segment 293 and the second bend segment 294, the first transition portion 296 abuts against the strip contact segment 291, and an arc-shaped second transition portion 297 is formed between the reversed and raised segment 295 and the second bend segment 294, the second transition portion 297 is slidably connected to the extension segment 292, and the axial directions of the first transition portion 296 and the second transition portion 297 are parallel. According to the above structure provided in the present embodiment, since the second transition portion 297 is slidably connected to the extension portion and the first transition portion 296 is parallel to the axial direction of the first transition portion 296, when the rear cover 104 is closed and the terminal of the motor 204 is inserted between the first transition portion 296 and the strip contact segment 291, the second transition portion 297 will slide on the extension segment 292 under the driving action of the elastically deformed first bend segment 293 and the second bend segment 294, avoiding jamming and providing a greater lateral clamping force on the terminal of the motor 204. In this way, on the one hand, the terminal of the motor 204 can be tightly clamped between the first transition portion 296 and the strip contact segment 291, and on the other hand, the strip contact segment 291 can be completely abutted against the terminal and effectively avoid heating of the terminal, which is conducive to further improving the reliability of the precision double-linkage valve exhaust gas recirculation valve in the present embodiment.

[0035] In another embodiment of the present application, please refer to Figures 1 to 10, the power supply line further includes an extension pin 210 connected to the rear cover 104; the extension pin 210 and the rear cover 104 cooperate to form a cavity for accommodating the connection spring piece 209. A riveting platform 211 is formed on the extension pin 210, and an outer folding section 298 that lies flat on the riveting platform 211 is formed on the connection spring piece 209. A riveting post 105 for riveting the connection spring piece 209 to the riveting platform 211 is formed on the rear cover 104. According to the above structure provided in this embodiment, the connection spring piece 209 can be tightly connected to the extension pin 210 through the riveting platform 211 formed on the extension pin 210, the outer folding section 298 formed on the connection spring piece 209, and the riveting post 105 formed on the rear cover 104. In this way, not only can a more stable connection be formed between the connection spring piece 209 and the motor 204, but also due to the limiting effect of the cavity side wall, after the wiring terminal of the motor 204 is inserted between the first transition portion 296 and the strip contact section 291, the back side of the strip contact section 291 of the connection spring piece 209 is in contact with the corresponding side of the extension pin 210, further increasing the electrical contact area between the connection spring piece 209 and the extension pin 210, effectively reducing the heat generation, and further improving the reliability of the precision double-linkage valve exhaust gas recirculation valve in this embodiment.

[0036] It can be understood that the manufacturing and assembly process of the rear cover 104 and the connection spring piece 209 is as follows: The power supply line formed by cold punching and bending of copper sheet material is embedded in the rear cover 104 by injection molding, and at least one side of the extension pin 210 facing the connection spring piece 209 is exposed in the preset cavity of the injection-molded rear cover 104 to become a vertical surface of the cavity. At the same time, the riveting platform 211 formed by bending the outer end of the extension pin 210 is exposed and abuts against the corresponding end surface of the rear cover 104. Since a round hole is pre-punched on the riveting platform 211, the material is extruded from the round hole during injection molding and cooperates with the corresponding cavity on the injection mold to form the riveting post 105. After the rear cover 104 is injection-molded, the connection spring piece 209 is inserted into the cavity, and the pre-punched hole on the outer folding section 298 is sleeved on the riveting post 105. Then, the riveting post 105 is softened and deformed by ultrasonic or heating means to make the outer folding section 298 in contact with the riveting platform 211. After the riveting post 105 cools and solidifies, the outer folding section 298 is connected to the riveting platform 211.

[0037] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A precision double-linked valve exhaust gas recirculation valve, characterized in that: include: A valve body (100) forming an intake passage (101) and a circulation passage (102) and an exhaust passage (103) respectively connected to the intake passage (101); A first valve assembly, comprising a sealing disk (201) arranged in the circulation channel (102) and a first rotating shaft (202) rotatably mounted on the valve body (100), wherein the sealing disk (201) is in transmission connection with the first rotating shaft (202) and can be driven by the first rotating shaft (202) to adjust the opening of the circulation channel (102); A second valve assembly, comprising a flow restricting plate (301) arranged in the air intake channel (101) and a second rotating shaft (302) rotatably mounted on the valve body (100), wherein the flow restricting plate (301) is transmission-connected to the second rotating shaft (302) and can be driven by the second rotating shaft (302) to adjust the ratio of the gas flow obtained by the circulation channel (102) and the exhaust channel (103) from the air intake channel (101), and the second rotating shaft (302) is parallel to the first rotating shaft (202); A linkage assembly comprises a linkage plate (401) vertically connected to the first rotating shaft (202), a transmission disc (402) coaxially connected to the second rotating shaft (302), and a roller (403) rotatably mounted on the transmission disc (402) and axially parallel to the second rotating shaft (302), wherein a guide groove (404) for accommodating the roller (403) is formed on the linkage plate (401), the guide groove (404) extending along a predetermined path and enabling the linkage plate (401) to drive the transmission disc (402) to rotate through a predetermined angle in the process of following the rotation of the first rotating shaft (202).

2. The precision double-linked valve exhaust gas recirculation valve according to claim 1, characterized in that: It also includes a convex ring platform (405) coaxially arranged with the first rotating shaft (202) and used to fix the linkage plate (401), and the linkage component also includes a magnetic steel (406) and a Hall sensor (407) respectively arranged inside the convex ring platform (405); The magnetic steel (406) forms an arc shape coaxial with the convex ring platform (405), and the Hall sensor (407) is arranged on the central axis of the convex ring platform (405) and is used to detect the rotation angle of the magnetic steel (406).

3. The precision double-linked valve exhaust gas recirculation valve according to claim 2, characterized in that: The precision double-linked valve exhaust gas recirculation valve further comprises a rear cover (104) detachably connected to the valve body (100); The rear cover (104) cooperates with the valve body (100) to form a cavity for accommodating the linkage assembly, and the Hall sensor (407) is detachably mounted on the rear cover (104).

4. The precision double-linked valve exhaust gas recirculation valve according to claim 1, characterized in that: The edge of the transmission disk (402) protrudes outward along its own radial direction to form an extension arm (408), and the roller (403) is rotatably mounted on the extension arm (408).

5. The precision double-linked valve exhaust gas recirculation valve according to claim 1, characterized in that: The linkage assembly further comprises a bearing (409) coaxially sleeved on the first rotating shaft (202) and the second rotating shaft (302); the first rotating shaft (202) and the second rotating shaft (302) are connected to the valve body (100) via the bearing (409).

6. The precision double-linked valve exhaust gas recirculation valve according to claim 1, characterized in that: The first valve assembly further comprises a sealing sleeve (203) connected to the inner wall of the circulation channel (102) and used for abutting against the sealing disk (201).

7. The precision double-linked valve exhaust gas recirculation valve according to claim 1, characterized in that: The flow limiting plate (301) comprises a first plate body (3011), a third plate body (3013), and a second plate body (3012) which are connected as one body, the first plate body (3011) and the second plate body (3012) being in a tongue-shaped structure, and the first plate body (3011) and the second plate body (3012) have an included angle C of 3 to 5 degrees, and the second plate body (3012) and the third plate body (3013) have an included angle D of 124 to 126 degrees; The first plate body (3011) and the second plate body (3012) extend to the end of the intake channel (101) and the beginning of the exhaust channel (103) respectively; the third plate body (3013) has at least one flat surface (3014) at both ends of the axial direction relative to the first rotating shaft (202); at least one of the flat surfaces (3014) is provided with a notch (3015); when the flow limiting plate (301) rotates to a minimum opening along with the first rotating shaft (202), the flat surface (3014) and the notch (3015) are used to enable the circulation channel (102) and the exhaust channel (103) to maintain a set minimum ventilation volume with respect to the intake channel (101).

8. The precision double-linked valve exhaust gas recirculation valve according to claim 3, characterized in that: The first valve assembly also includes a motor (204), a driving gear (205), an intermediate gear (206), and a driven gear (207) of a transmission arrangement; The convex ring platform (405) is coaxial with the passive gear (207) and is integrally formed at an end of the passive gear (207) away from the sealing disk (201); The motor (204) is arranged inside the valve body (100); the driving gear (205) is coaxially connected to the motor shaft of the motor (204); the intermediate gear (206) is a double gear arranged between the driving gear (205) and the driven gear (207) so that the driving gear (205), the intermediate gear (206) and the driven gear (207) form a two-stage reduction gear transmission pair; the driven gear (207) is coaxially connected to the first rotating shaft (202).

9. The precision double-linked valve exhaust gas recirculation valve according to claim 8, characterized in that: The first valve assembly further comprises a plug connector (208) arranged on the rear cover (104) and a power supply circuit connected between the plug connector (208) and the motor (204) and used to supply power to the motor (204); The power supply line has a connecting spring (209) for forming an electrical connection with the motor (204); the connecting spring (209) forms a strip contact segment (291) and an extension segment (292) arranged parallel to and spaced from the strip contact segment (291); and also forms a first bend segment (293), a second bend segment (294) and a reverse folded and raised segment (295) connected end to end in sequence; an arc-shaped first transition portion (296) is formed between the first bend segment (293) and the second bend segment (294); the first transition portion (296) abuts against the strip contact segment (291); an arc-shaped second transition portion (297) is formed between the reverse folded and raised segment (295) and the second bend segment (294); the second transition portion (297) is slidably connected to the extension segment (292); and the first transition portion (296) and the second transition portion (297) are axially parallel.

10. The precision double-linked valve exhaust gas recirculation valve according to claim 9, characterized in that: The power supply circuit also includes an extension foot (210) connected to the rear cover (104); The extension foot (210) cooperates with the back cover (104) to form a cavity for accommodating the connecting spring (209), a riveting platform (211) is formed on the extension foot (210), the connecting spring (209) forms an outer folding section (298) flat on the riveting platform (211), and a riveting column (105) is formed on the back cover (104) for riveting the connecting spring (209) to the riveting platform (211).

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