Precise exhaust gas recirculation valve with double linkage valves

Abstract

The utility model 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 particularly relates to a precision double linkage valve exhaust gas recirculation valve. BACKGROUND

[0002] An exhaust gas recirculation (EGR) system reduces nitrogen oxide (NOx) emissions by recirculating part of the exhaust gas into the combustion chamber, and an EGR valve, as the core executive component, needs to accurately control the exhaust gas flow and distribution ratio under high dynamic conditions.

[0003] Traditional EGR valves mostly adopt a single valve structure, which is simple in structure but prone to EGR rate fluctuations due to insufficient flow regulation range under low load or transient conditions, affecting combustion stability. Although the double-valve EGR valve that has appeared in recent years improves the regulation accuracy by independently controlling the flow of the circulation channel and the exhaust channel, it faces problems such as response delay, complex control logic, high sensor redundancy, and rising costs due to the reliance on electronic signal synchronous driving of two valves (such as double motors or double electromagnetic drives). In particular, under harsh conditions such as high temperature and vibration, the electrical connections of electronic components are prone to poor contact, and the reliability risk further restricts its practical application. Therefore, it is necessary to solve the above technical problems. SUMMARY

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

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present application is to provide a precision double linkage valve exhaust gas recirculation valve, comprising:

[0006] a valve body forming an intake passage and a circulation passage and an exhaust passage respectively connected to the intake passage;

[0007] a first valve assembly comprising a sealing disc arranged in the circulation passage and a first rotating shaft rotatably mounted on the valve body, the sealing disc being in transmission connection with the first rotating shaft and being capable of being driven by the first rotating shaft to adjust the opening degree of the circulation passage;

[0008] a second valve assembly comprising a flow limiting plate arranged in the intake passage and a second rotating shaft rotatably mounted on the valve body, the flow limiting plate being in transmission connection with the second rotating shaft and being capable of being driven by the second rotating shaft to adjust the proportion of gas flow obtained from the intake passage by the circulation passage and the exhaust passage, the second rotating shaft being parallel to the first rotating shaft;

[0009] The linkage assembly comprises a linkage plate connected to the first rotating shaft, a transmission disc coaxially connected to the second rotating shaft, and a roller rotatingly installed on the transmission disc and axially parallel to the second rotating shaft, the linkage plate is provided with a guide groove for accommodating the roller, the guide groove extends along a predetermined path and enables the linkage plate to drive the transmission disc to rotate through a predetermined angle when the linkage plate rotates along with the first rotating shaft.

[0010] Optionally, the linkage assembly further comprises a convex ring table coaxially arranged with the first rotating shaft and used for fixing the linkage plate, and the linkage assembly further comprises a magnetic steel and a Hall sensor arranged in the interior of the convex ring table respectively.

[0011] The magnetic steel forms an arc shape coaxial with the convex ring table, and the Hall sensor is arranged on the central axis of the convex ring table and used for detecting the rotating angle of the magnetic steel.

[0012] Optionally, the precise double-linkage valve EGR valve further comprises a rear cover detachably connected to the valve body.

[0013] The rear cover cooperates with the valve body to form a cavity for accommodating the linkage assembly, and the Hall sensor is detachably clamped on the rear cover.

[0014] Optionally, the edge of the transmission disc is outwardly convex along the radial direction of the transmission disc to form an extension arm, and the roller is rotatingly installed on the extension arm.

[0015] Optionally, the linkage assembly further comprises a bearing 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 bearing.

[0016] Optionally, the first valve assembly further comprises a sealing sleeve connected to the inner wall of the circulation channel and used for abutting against the sealing disc.

[0017] Optionally, the flow limiting plate comprises a first plate body, a third plate body and a second plate body connected as one body, the first plate body and the second plate body have a tongue-shaped structure and an included angle C=3-5 degrees, and the second plate body and the third plate body have an included angle D=124-126 degrees.

[0018] The first plate body and the second plate body respectively extend to the end of the air inlet channel and the beginning of the exhaust channel, and at least one flat surface is provided on at least one of the two ends of the third plate body relative to the first rotating shaft, and a notch is provided on the flat surface, the flat surface and the notch are used to maintain a set minimum air flow between the circulation channel, the exhaust channel and the air inlet channel when the flow limiting plate rotates to the minimum opening degree along with the first rotating shaft.

[0019] Optionally, the first valve assembly further comprises a transmission arranged motor, a driving gear, an intermediate gear and a driven gear;

[0020] The convex ring table is coaxial with the driven gear and integrally formed at an end of the driven gear away from the sealing disc.

[0021] The motor is arranged inside the valve body, the driving gear is coaxially connected on a motor shaft of the motor, the intermediate gear is a double gear arranged between the driving gear and the driven gear and makes the driving gear, the intermediate gear and the driven gear form a two-stage reduction gear transmission pair, and the driven gear is coaxially connected with the first rotating shaft.

[0022] Optionally, the first valve assembly further comprises a plug connector arranged 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.

[0023] The power supply circuit has a connecting spring for forming an electrical connection with the motor, the connecting spring forms a strip-shaped contact segment and an extension segment arranged in parallel and spaced apart from the strip-shaped contact segment, and also forms a first return segment, a second return segment and a reverse folding segment connected in sequence, a first transition portion in an arc shape is formed between the first return segment and the second return segment, the first transition portion abuts against the strip-shaped contact segment, a second transition portion in an arc shape is formed before the reverse folding segment and the second return segment, the second transition portion is slidably connected to the extension segment, and the first transition portion and the second transition portion are axially parallel.

[0024] Optionally, the power supply circuit further comprises an extension foot connected to the rear cover.

[0025] The extension foot cooperates with the rear cover to form a cavity accommodating the connecting spring, a riveting platform is formed on the extension foot, the connecting spring forms an outer folding segment flatly arranged on the riveting platform, and a riveting column is formed on the rear cover to make the connecting spring riveted on the riveting platform.

[0026] The advantages of the precision double-linkage valve exhaust gas recirculation valve provided in this application are as follows: Compared with the prior art, in the precision double-linkage valve exhaust gas recirculation valve provided in this application, since the second rotating shaft is parallel to the first rotating shaft, and since the linkage plate connected to the first rotating shaft forms a guide groove for accommodating the rollers on the transmission disc and the guide groove extends along a predetermined path, in the process of the first rotating shaft driving the sealing disc to adjust the opening of the circulation channel, the preset guide groove on the linkage plate will force the rollers on the transmission disc to move along a specific path, thereby driving the second rotating shaft to rotate precisely, so that the flow limiting plate synchronously adjusts the flow distribution ratio from the intake channel to the circulation channel and the exhaust channel. This purely mechanical linkage method can not only ensure the synchronicity and accuracy of the action of the two valves, but also achieve non-linear flow distribution through the carefully designed guide groove curve path, thereby perfectly matching the dynamic requirements of the exhaust gas recirculation rate under different engine operating conditions; 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 a very high reliability, far superior to the prior art. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a partial structural schematic diagram of the precision double-linkage valve exhaust gas recirculation valve in the embodiments of this application;

[0029] Figure 2 This is a partial structural cross-section of the precision double-linkage valve exhaust gas recirculation valve in the embodiments of this application. Figure 1 ;

[0030] Figure 3 This is a partial structural cross-section of the precision double-linkage valve exhaust gas recirculation valve in the embodiments of this application. Figure 2 ;

[0031] Figure 4 This is a schematic diagram of the main structure of the precision double-linkage valve exhaust gas recirculation valve in the embodiments of this application;

[0032] Figure 5 For along Figure 4 Cross-sectional view of line AA in the middle;

[0033] Figure 6 This is a schematic diagram of the overall structure of the power supply line in the embodiments of this application;

[0034] Figure 7 It is a top view structural schematic diagram of a precise double linkage valve exhaust gas recirculation valve in the embodiments of the present application.

[0035] Figure 8 It is a sectional view structure diagram along B-B line in the embodiments of the present application. Figure 7

[0036] Figure 9 It is an enlarged view of E in the embodiments of the present application. Figure 5

[0037] Figure 10 It is a three-dimensional structural schematic diagram of a flow limiting plate in the embodiments of the present application.

[0038] In the drawings, reference signs 100, valve body; 101, inlet channel; 102, circulation channel; 103, exhaust channel; 104, rear cover; 105, riveting column; 201, sealing disc; 202, first rotating shaft; 203, sealing sleeve; 204, motor; 205, driving gear; 206, intermediate gear; 207, driven gear; 208, plug connector; 209, connecting spring piece; 210, extension foot; 211, riveting platform; 291, strip-shaped contact segment; 292, extension segment; 293, first return bend segment; 294, second return bend segment; 295, reverse folding and lifting segment; 296, first transition part; 297, second transition part; 298, outer folding segment; 301, flow 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 disc; 403, roller; 404, guide groove; 405, convex ring table; 406, magnetic steel; 407, Hall sensor; 408, extension arm; 409, bearing. DETAILED DESCRIPTION

[0039] In order to make the technical problems, technical solutions and beneficial effects of the present application more clearly understood, the present application will be further described in detail below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0040] 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.

[0041] ​​It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like, indicate directions or positions based on the directions or positions shown in the drawings, and are used for convenience of description and simplification of description only, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application.

[0042] In addition, the terms "first", "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0043] Please refer to Figures 1 to 10 , a precise double linkage valve exhaust gas recirculation valve provided by the embodiment of the application will be described. The precise double linkage valve exhaust gas recirculation valve comprises a valve body 100, a first valve assembly, a second valve assembly and a linkage assembly. Among them:

[0044] The valve body 100 forms an intake passage 101 and a circulation passage 102 and an exhaust passage 103 respectively connected to the intake passage 101. In this embodiment, the intake passage 101 is used to access the exhaust gas discharged by the engine, the circulation passage 102 is used to recirculate the exhaust gas into the engine as needed, and the exhaust passage 103 is used to guide the excess exhaust gas to the exhaust pipe. The first valve assembly comprises a sealing disc 201 arranged in the circulation passage 102 and a first rotating shaft 202 rotatably mounted on the valve body 100, the sealing disc 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 degree of the circulation passage 102; the second valve assembly comprises a flow limiting plate 301 arranged in the intake passage 101 and a second rotating shaft 302 rotatably mounted on the valve body 100, the flow limiting plate 301 is in transmission connection with the second rotating shaft 302 and can be driven by the second rotating shaft 302 to adjust the proportion of the gas flow obtained from the intake passage 101 by the circulation passage 102 and the exhaust passage 103, the second rotating shaft 302 is parallel to the first rotating shaft 202; the linkage assembly comprises a linkage plate 401 connected perpendicularly 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, the linkage plate 401 forms a guide groove 404 for accommodating the roller 403, the guide groove 404 extends according to a predetermined path and can drive the transmission disc 402 to rotate through a predetermined angle in the process of following the rotation of the first rotating shaft 202.

[0045] According to the above structure provided in the embodiment, in the precise double linkage valve EGR valve provided in the embodiment, since the second rotating shaft 302 is parallel to the first rotating shaft 202, and since the guide groove 404 for accommodating the roller 403 on the transmission disc 402 is formed on the linkage plate 401 connected to the first rotating shaft 202 and extends along a predetermined path, when the first rotating shaft 202 drives the sealing disc 201 to adjust the opening degree of the circulation passage 102, the preset guide groove 404 on the linkage plate 401 forces the roller 403 on the transmission disc 402 to move along a specific path, thereby driving the second rotating shaft 302 to rotate accurately, so that the flow distribution ratio of the intake passage 101, the circulation passage 102 and the exhaust passage 103 is adjusted synchronously by the flow limiting plate 301. This purely mechanical linkage mode not only ensures the synchronism and accuracy of the double valve action, but also realizes nonlinear flow distribution through the curve path of the carefully designed guide groove 404, thereby perfectly matching the dynamic demand of the EGR rate under different working conditions of the engine. In addition, the purely mechanical linkage design can significantly improve the durability of the valve in a high temperature and high vibration environment, so that the precise double linkage valve EGR valve provided in the application has relatively high reliability, which is much better than the prior art.

[0046] In another embodiment of the application, referring to Figures 1 to 10 , the precise double linkage valve EGR valve provided in the embodiment further comprises a convex ring table 405 coaxially arranged with the first rotating shaft 202 and used for fixing the linkage plate 401, and the linkage assembly further comprises a magnetic steel 406 and a Hall sensor 407 arranged in the convex ring table 405 respectively; the magnetic steel 406 forms an arc shape coaxial with the convex ring table 405, and the Hall sensor 407 is arranged on the central axis of the convex ring table 405 and used for detecting the rotation angle of the magnetic steel 406. According to the above structure provided in the embodiment, since the Hall sensor 407 is arranged on the central axis of the convex ring table 405, when the convex ring table 405 rotates around the central axis of the first rotating shaft 202 following the linkage plate 401, the Hall sensor 407 can accurately detect the rotation angle of the first rotating shaft 202 through the magnetic steel 406 arranged in the convex ring table 405, so that the driving mechanism can more accurately control the rotation of the first rotating shaft 202 after the Hall sensor 407 feeds back the detection signal to the driving mechanism drivingly connected with the first rotating shaft 202, which is beneficial to further improve the reliability of the precise double linkage valve EGR valve in the embodiment.

[0047] In another embodiment of the application, referring to Figures 1 to 10, the precise double linkage 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 clamped on the rear cover 104. According to the above structure provided in the embodiment, the rear cover 104 detachably connected to the valve body 100 and clamped with the Hall sensor 407 can not only facilitate the maintenance of the linkage assembly by the operator, but also facilitate the replacement of the damaged Hall sensor 407 by the operator in time, which is conducive to further improving the reliability of the precise double linkage valve exhaust gas recirculation valve in the embodiment.

[0048] In another embodiment of the application, please refer to Figures 1 to 10 , the edge of the transmission disc 402 is radially outwardly protruded to form an extension arm 408, and the roller 403 is rotatably installed on the extension arm 408. According to the above structure provided in the embodiment, the connecting arm formed on the transmission disc 402 can not only make the roller 403 better adapt to the guide groove 404, but also make the guide groove 404 be designed according to a more flexible path, which is conducive to further improving the reliability of the precise double linkage valve exhaust gas recirculation valve in the embodiment.

[0049] In another embodiment of the application, please refer to Figures 1 to 10 , the linkage assembly further comprises a bearing 409 coaxially sleeved on the first shaft 202 and the second shaft 302, and the first shaft 202 and the second shaft 302 are connected to the valve body 100 through the bearing 409. According to the above structure provided in the embodiment, the bearing 409 coaxially connected to the first shaft 202 and the second shaft 302 can make the first shaft 202 and the second shaft 302 rotate more stably and accurately, which is conducive to further improving the reliability of the precise double linkage valve exhaust gas recirculation valve in the embodiment.

[0050] In another embodiment of the application, please refer to Figures 1 to 10 , 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 disc 201. According to the above structure provided in the embodiment, the sealing sleeve 203 arranged in the circulation channel 102 can make the opening adjustment of the circulation channel 102 more accurate and the flow control more precise by abutting against the sealing disc 201, and the sealing sleeve 203 can also be surface modified by a heat treatment process to improve the surface hardness and thus improve the wear resistance and corrosion resistance, which is conducive to further improving the reliability of the precise double linkage valve exhaust gas recirculation valve in the embodiment.

[0051] In another embodiment of the application, please refer to Figures 1 to 10The flow restrictor 301 includes a first plate 3011, a third plate 3013, and a second plate 3012 integrally connected. The first plate 3011 and the second plate 3012 have a tongue-shaped structure and an included angle C of 3 to 5 degrees between them. The second plate 3012 and the third plate 3013 have an angle D of 124 to 126 degrees. In a preferred embodiment, the included angle C is 4 degrees and the angle D is 125 degrees. Thus, when more exhaust gas needs to enter the circulation channel 102, the opening of the flow restrictor 301 relative to the circulation channel 102 increases (i.e., the flow restrictor 301 is adjusted according to the angle). Figure 9 During the clockwise rotation (as shown), due to the effect of the included angle C, the second plate 3012 reduces the effective diameter of the exhaust passage 103 located on the side of the recirculation passage 102 more quickly, thereby rapidly guiding more exhaust gas to the recirculation passage 102, ensuring sufficient usable exhaust gas within the recirculation passage 102. At this time, the exhaust gas ultimately entering the engine for reuse is entirely related to the opening degree of the sealing disc 201, thereby improving the response accuracy of this precision dual-linkage valve exhaust gas recirculation valve. Conversely, when the amount of exhaust gas requiring recirculation is small, the flow restrictor 301 moves counterclockwise, at which time the first plate 301... 1. The second plate 3012 is located on one side of the inlet of the circulation channel 102 near the end of the intake channel 101. Due to the included angle C, the exhaust channel 103 and the intake channel 101 have a sufficiently large effective passage, which is conducive to the discharge of unwanted exhaust gas from the intake channel 101. Furthermore, the exhaust gas generates a high flow velocity at the inlet of the exhaust channel 103 towards the outlet of the exhaust channel 103, which causes a negative pressure at the inlet of the circulation channel 102 towards the outlet of the exhaust channel 103, thereby rapidly reducing the amount of exhaust gas entering the circulation channel 102 and achieving a rapid response effect.

[0052] The first plate 3011 and the second plate 3012 extend to the end of the intake channel 101 and the beginning of the exhaust channel 103, respectively. The third plate 3013 has at least one straight surface 3014 at each end relative to the axial direction of the first rotating shaft 202, and at least one straight surface 3014 has a notch 3015. Thus, when the flow restrictor 301 rotates to its minimum opening with the first rotating shaft 202, the straight surface 3014 and the notch 3015 are used to maintain the set minimum airflow between the circulation channel 102 and the exhaust channel 103 and the intake channel 101. According to the structure provided in this embodiment, the extension of the first plate 3011 and the second plate 3012 to the end of the intake channel 101 and the beginning of the exhaust channel 103, respectively, not only enables the precision double-linkage valve exhaust gas recirculation valve in this embodiment to form a more flexible effect of adjusting the guiding airflow, but also ensures the set minimum airflow, further improving its reliability.

[0053] Here, further, the air inlet channel 101 is tapered, gradually narrowing towards the air outlet channel 103, so that, on the one hand, it is beneficial to form a faster air flow speed at the end of the air inlet channel 101, facilitating the flow distribution of the flow restrictor 301 and improving the sensitivity; on the other hand, it is beneficial to reduce the size of the flow restrictor 301, making the flow restrictor 301 light, also beneficial to improve the control accuracy, and reduce the load on the guide groove 404, further improving the reliability of the precise double linkage valve exhaust gas recirculation valve in the embodiment.

[0054] In another embodiment of the present application, please refer to Figures 1 to 10 , the first valve assembly further comprises a transmission arranged motor 204, a driving gear 205, an intermediate gear 206 and a driven gear 207; wherein the convex ring table 405 is coaxial with the driven gear 207 and is integrally formed at the 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 on the motor shaft of the motor 204, the intermediate gear 206 is arranged between the driving gear 205 and the driven gear 207 and forms a two-stage reduction gear transmission pair of the driving gear 205, the intermediate gear 206 and the driven gear 207, and the driven gear 207 is coaxially connected with the first rotating shaft 202. According to the above structure provided in the 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 improve the load capacity of the motor 204 of the precise double linkage valve exhaust gas recirculation valve in the embodiment, and further improve the reliability. In addition, the convex ring table 405 and the driven gear 207 are arranged as an integral structure in the embodiment, which is also beneficial to further improve the adjustment flexibility and accuracy of the precise double linkage valve exhaust gas recirculation valve in the embodiment.

[0055] In another embodiment of the present application, please refer to Figures 1 to 10The first valve assembly further comprises a plug 208 arranged on the rear cover 104 and a power supply line connected between the plug 208 and the motor 204 and used for supplying power to the motor 204; the power supply line has a connecting spring 209 used for forming an electrical connection with the motor 204, the connecting spring 209 forms a strip-shaped contact section 291 and an extension section 292 arranged in parallel with the strip-shaped contact section 291, and further forms a first return section 293, a second return section 294 and a reverse folding section 295 connected in sequence, the first return section 293 and the second return section 294 form an arc-shaped first transition section 296, the first transition section 296 abuts against the strip-shaped contact section 291, the reverse folding section 295 and the second return section 294 form an arc-shaped second transition section 297, the second transition section 297 is slidably connected to the extension section 292, and the first transition section 296 and the second transition section 297 are axially parallel. According to the above structure provided in the embodiment, since the second transition section 297 is slidably connected to the extension section and the first transition section 296 and the second transition section 297 are axially parallel, when the rear cover 104 is closed and the terminal of the motor 204 is inserted between the first transition section 296 and the strip-shaped contact section 291, the second transition section 297 will slide on the extension section 292 under the driving action of the first return section 293 and the second return section 294 which are elastically deformed, thereby avoiding jamming and providing greater lateral pressing force to the terminal of the motor 204, which can on the one hand tightly clamp the terminal of the motor 204 between the first transition section 296 and the strip-shaped contact section 291, and on the other hand make the strip-shaped contact section 291 abut against the terminal and effectively avoid the terminal from heating, which is beneficial to further improve the reliability of the precise double linkage valve EGR valve in the embodiment.

[0056] In another embodiment of the present application, please refer to Figures 1 to 10, the power supply circuit further comprises an extension leg 210 connected to the rear cover 104; the extension leg 210 cooperates with the rear cover 104 to form a cavity for accommodating the connecting spring 209, the extension leg 210 is formed with a riveting platform 211, the connecting spring 209 is formed with an outer bent section 298 which is flatly arranged on the riveting platform 211, and the rear cover 104 is formed with a riveting column 105 for riveting the connecting spring 209 to the riveting platform 211. According to the above structure provided in the embodiment, the connecting spring 209 is tightly connected to the extension leg 210 through the riveting platform 211 formed on the extension leg 210, the outer bent section 298 formed on the connecting spring 209, and the riveting column 105 formed on the rear cover 104, so that the connecting spring 209 and the motor 204 are more stably connected, and the connecting spring 209 is further tightly contacted with the extension leg 210 due to the restriction of the cavity sidewall after the wire terminal of the motor 204 is inserted between the first transition section 296 and the strip-shaped contact section 291, so that the connecting spring 209 is further increased in the electric contact area with the extension leg 210, the heat generation is effectively reduced, and the reliability of the precise double-action valve EGR valve in the embodiment is further improved.

[0057] It can be understood that the rear cover 104 and the connecting spring 209 are manufactured and assembled by the following process: the power supply circuit formed by copper plate material through cold punching and bending is embedded in the rear cover 104 by injection molding, and at least one side of the extension leg 210 facing the connecting spring 209 is exposed to the preset cavity of the rear cover 104 after injection molding to become a vertical surface of the cavity, and the riveting platform 211 formed by bending the outer end of the extension leg 210 is exposed and tightly fitted on the corresponding end surface of the rear cover 104. Since the riveting platform 211 is pre-punched with a round hole, 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 column 105. After the rear cover 104 is injection molded, the connecting spring 209 is inserted into the cavity, the pre-punched hole of the outer bent section 298 is sleeved on the riveting column 105, and then the riveting column 105 is softened and deformed by ultrasonic or heating to make the outer bent section 298 contact with the riveting platform 211. After the riveting column 105 is cooled and solidified, the outer bent section 298 is connected to the riveting platform 211.

[0058] The above only describes the preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement and improvement 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-linkage exhaust gas recirculation valve, characterized in that, include: The valve body (100) forms an intake passage (101) and a circulation passage (102) and an exhaust passage (103) respectively connected to the intake passage (101). The first valve assembly includes a sealing disc (201) disposed in the circulation channel (102) and a first rotating shaft (202) rotatably mounted on the valve body (100). The sealing disc (201) is kinetically 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 restrictor (301) disposed in the air intake channel (101) and a second rotating shaft (302) rotatably mounted on the valve body (100). The flow restrictor (301) is tractively connected to the second rotating shaft (302) and can be driven by the second rotating shaft (302) to adjust the ratio of gas flow rate obtained by the circulation channel (102) and the exhaust channel (103) from the air intake channel (101). 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 parallel to the axial direction of the second rotating shaft (302). A guide groove (404) is formed on the linkage plate (401) for accommodating the roller (403). The guide groove (404) extends along a predetermined path and enables the linkage plate (401) to drive the transmission disk (402) to rotate through a predetermined angle as it follows the rotation of the first rotating shaft (202).

2. The precision double-linkage valve exhaust gas recirculation valve as described in 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). The linkage assembly also includes a magnet (406) and a Hall sensor (407) respectively disposed inside the convex ring platform (405). The magnet (406) is formed in an arc shape coaxial with the convex ring stage (405), and the Hall sensor (407) is disposed on the central axis of the convex ring stage (405) and used to detect the rotation angle of the magnet (406).

3. The precision double-linkage valve exhaust gas recirculation valve as described in claim 2, characterized in that: The precision double-linkage valve exhaust gas recirculation valve also includes a rear cover (104) that is detachably connected to the valve body (100). The rear cover (104) and the valve body (100) 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-linkage valve exhaust gas recirculation valve as described in claim 1, characterized in that: The edge of the transmission disc (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-linkage valve exhaust gas recirculation valve as described in claim 1, characterized in that: The linkage component also includes a bearing (409) coaxially mounted 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).

6. The precision double-linkage valve exhaust gas recirculation valve as described in claim 1, characterized in that: The first valve assembly also includes a sealing sleeve (203) connected to the inner wall of the circulation channel (102) and used to abut against the sealing disc (201).

7. The precision double-linkage valve exhaust gas recirculation valve as described in claim 1, characterized in that: The flow-limiting plate (301) includes a first plate (3011), a third plate (3013), and a second plate (3012) that are integrally connected. The first plate (3011) and the second plate (3012) have a tongue-shaped structure and the first plate (3011) and the second plate (3012) have an included angle C = 3 to 5 degrees. The second plate (3012) and the third plate (3013) have an angle D = 124 to 126 degrees. The first plate (3011) and the second plate (3012) extend to the end of the intake channel (101) and the beginning of the exhaust channel (103), respectively. The third plate (3013) has at least one flat surface (3014) at both ends of the first rotating shaft (202) axial direction. At least one of the flat surfaces (3014) is provided with a notch (3015). When the flow restrictor (301) rotates to the minimum opening with the first rotating shaft (202), the flat surface (3014) and the notch (3015) are used to keep the circulation channel (102) and the exhaust channel (103) and the intake channel (101) at a set minimum airflow.

8. The precision double-linkage valve exhaust gas recirculation valve as described in claim 3, characterized in that: The first valve assembly also includes a motor (204), a drive gear (205), an intermediate gear (206), and a driven gear (207) that are configured for transmission. The convex ring (405) is coaxial with the driven gear (207) and integrally formed at the end of the driven gear (207) away from the sealing disc (201); The motor (204) is located 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 located between the driving gear (205) and the driven gear (207), forming a two-stage reduction gear transmission pair with the driving gear (205), the intermediate gear (206), and the driven gear (207). The driven gear (207) is coaxially connected to the first rotating shaft (202).

9. The precision double-linkage valve exhaust gas recirculation valve as described in claim 8, characterized in that: The first valve assembly also includes a connector (208) disposed on the rear cover (104) and a power supply line connecting the connector (208) and the motor (204) for supplying power to the motor (204); The power supply line has a connecting spring (209) for 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 apart from the strip contact segment (291). It also forms a first bend segment (293), a second bend segment (294), and a reverse bend segment (295) connected end to end. 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 bend segment (295) and the second bend segment (294). The second transition portion (297) is slidably connected to the extension segment (292). The first transition portion (296) and the second transition portion (297) are parallel in axis.

10. The precision double-linkage valve exhaust gas recirculation valve as described in claim 9, characterized in that: The power supply line also includes an extension foot (210) connected to the rear cover (104). The extension foot (210) cooperates with the rear 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 outward fold (298) that is flat against the riveting platform (211). A riveting post (105) is formed on the rear cover (104) to rivet the connecting spring (209) onto the riveting platform (211).

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