EGR valve and exhaust gas recirculation system

Abstract

The EGR valve comprises a transmission rod, a fixing assembly, a connecting rod, a movement reversing mechanism, a valve rod and an elastic pre-tightening piece, the transmission rod and the fixing assembly are movably matched in the axial direction of the transmission rod, the connecting rod is connected with the transmission rod and the movement reversing mechanism, the valve rod is connected to the movement reversing mechanism, and when the connecting rod rotates, the elastic pre-tightening piece rotates around the movement reversing mechanism. The valve rod can be driven by the movement reversing mechanism to linearly move in the direction perpendicular to the axis of the transmission rod. One end of the elastic pre-tightening piece abuts against the fixing assembly, the other end of the elastic pre-tightening piece abuts against the transmission rod directly or indirectly, and the elastic pre-tightening piece can apply elastic pre-tightening force moving towards the movement reversing mechanism to the transmission rod and the connecting rod and enable the connecting rod to be stopped on the side, close to the transmission rod, of the movement reversing mechanism. Therefore, the movement reversing mechanism is prevented from deflecting relative to the axial direction of the transmission rod. According to the EGR valve and the exhaust gas recirculation system, the problem that the motion reversing mechanism and the eccentric wheel are prone to deflection under the working condition of long-term vibration is solved.

Description

Technical Field

[0001] The present application relates to the technical field of exhaust gas recirculation devices, and in particular to an EGR valve and an exhaust gas recirculation system. Background Art

[0002] Exhaust gas recirculation (EGR) is a technology that recirculates a portion of post-combustion exhaust gas back into the intake tract, where it enters the internal combustion engine cylinders along with fresh air for reburning. The exhaust gas recirculation valve (EGR valve), as the core module of EGR, primarily regulates the exhaust gas flow rate.

[0003] The EGR valve generally outputs rotational motion through a motor, and transmits the rotational torque to the eccentric wheel through a set of gear reduction mechanisms. The eccentric wheel converts the rotational motion into linear motion of the valve stem and valve plate through a motion reversing mechanism, and realizes the switching function through the valve plate.

[0004] In order to ensure assembly margin, the gear reduction mechanism and the eccentric wheel usually have a certain amount of axial play. However, in the long run, the motion reversing mechanism and the eccentric wheel are prone to left and right deflection under long-term vibration conditions, that is, the axial directions of the eccentric wheel and the gear reduction mechanism are not perpendicular. This will further lead to poor motion transmission of the gear reduction mechanism, the eccentric wheel and the motion reversing mechanism. In severe cases, it will cause the EGR valve to get stuck and there is even a risk of valve leakage. Utility Model Content

[0005] Based on this, it is necessary to provide an EGR valve and an exhaust gas recirculation system to solve the problem that the motion reversing mechanism and the eccentric wheel are prone to left and right deflection under long-term vibration conditions.

[0006] The EGR valve provided in the present application includes a transmission rod, a fixed assembly, a connecting rod, a motion reversing mechanism, a valve stem and an elastic pre-tightening member. The transmission rod and the fixed assembly are movably matched along the axial direction of the transmission rod. One end of the connecting rod is connected to the transmission rod, and the other end is connected to the motion reversing mechanism. The valve stem is connected to the motion reversing mechanism. The connecting rod can rotate around the axial direction of the transmission rod and drive the valve stem to move linearly in a direction perpendicular to the axis of the transmission rod through the motion reversing mechanism; one end of the elastic pre-tightening member abuts against the fixed assembly, and the other end directly or indirectly abuts against the transmission rod. The elastic pre-tightening member can apply an elastic pre-tightening force to the transmission rod and the connecting rod to move toward the motion reversing mechanism, and stop the connecting rod on the side of the motion reversing mechanism close to the transmission rod to prevent the motion reversing mechanism from deflecting relative to the axial direction of the transmission rod.

[0007] In one embodiment, the connecting rod is disc-shaped, and all parts of the connecting rod around the axial direction of the transmission rod are in stop engagement with the motion reversing mechanism.

[0008] In one embodiment, the elastic preload member is a wave spring, a compression spring or a spring structure.

[0009] In one embodiment, a second step structure is provided on the outer peripheral side of the transmission rod, and the step surface of the second step structure is arranged toward the side close to the motion reversing mechanism. The EGR valve also includes a limiting structure, which is fixedly connected to the fixed component. When the transmission rod moves toward the direction close to the motion reversing mechanism, the limiting structure can stop at the step surface of the second step structure.

[0010] In one embodiment, the limiting structure is annular, and the inner ring of the limiting structure is movably sleeved on the outer peripheral side of the transmission rod, and the outer ring of the limiting structure is fixedly installed on the fixing component.

[0011] In one embodiment, when the limiting structure stops at the step surface of the second step structure, a fitting gap exists between the end surface of the connecting rod and the end surface of the motion reversing mechanism.

[0012] In one embodiment, the EGR valve also includes a motor, an output gear and a reduction gear. The output gear is arranged at the output end of the motor. The reduction gear and the output gear are meshed and connected. The rotation radius of the reduction gear is larger than the rotation radius of the output gear to reduce the output speed of the motor. The transmission rod and the reduction gear are coaxially arranged and fixedly connected.

[0013] In one embodiment, the reduction gear is fixedly sleeved on the outer peripheral side of the transmission rod, and along the axial direction of the transmission rod, the two ends of the transmission rod respectively protrude from the two ends of the reduction gear. The end of the transmission rod protruding away from the motion reversing mechanism is defined as the first end, and the end of the transmission rod protruding close to the motion reversing mechanism is defined as the second end. The transmission rod is abutted against the elastic preloaded member through the first end, and the transmission rod is connected to the connecting rod through the second end.

[0014] In one embodiment, the elastic pre-tightening element is movably sleeved on the outer peripheral side of the first end portion.

[0015] The present application also provides an exhaust gas recirculation system, which includes the EGR valve described in any one of the above embodiments.

[0016] Compared to the prior art, the EGR valve and exhaust gas recirculation system provided by this application utilizes an elastic preloaded member that, through the transmission rod, pushes the connecting rod to stop against one side of the motion reversing mechanism. Therefore, when the motion reversing mechanism deflects or tends to deflect, the stopping action of the connecting rod prevents the mechanism from significantly deflecting. Furthermore, because the elastic preloaded member possesses a certain degree of elastic deformation, even if the motion reversing mechanism deflects to a certain extent, the elastic preloaded member can quickly reset the mechanism.

[0017] Such an arrangement is not only conducive to smooth motion transmission of the transmission rod, the connecting rod and the motion reversing mechanism, but also can reduce the probability of EGR valve getting stuck and the risk of valve plate leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 A schematic structural diagram of an EGR valve according to an embodiment of the present application;

[0020] Figure 2 A cross-sectional view of an EGR valve according to an embodiment of the present application;

[0021] Figure 3 A schematic diagram of the partial structure of an EGR valve according to an embodiment of the present application Figure 1 ;

[0022] Figure 4 A schematic diagram of the partial structure of an EGR valve according to an embodiment of the present application Figure 2 .

[0023] Figure markings: 100, motor; 200, output gear; 300, reduction gear; 400, transmission rod; 410, first end; 420, second end; 430, first step structure; 440, second step structure; 500, fixing assembly; 510, limiting structure; 520, housing; 530, second bearing; 600, connecting rod; 700, motion reversing mechanism; 710, first bearing; 720, moving block; 721, elongated slot; 800, elastic preload; 910, valve stem; 920, valve plate. DETAILED DESCRIPTION

[0024] Exhaust gas recirculation (EGR) is a technology that recirculates a portion of post-combustion exhaust gas back into the intake tract, where it enters the internal combustion engine cylinders along with fresh air for reburning. The exhaust gas recirculation valve (EGR valve), as the core module of EGR, primarily regulates the exhaust gas flow rate.

[0025] The EGR valve generally outputs rotational motion through a motor, and transmits the rotational torque to the eccentric wheel through a set of gear reduction mechanisms. The eccentric wheel converts the rotational motion into linear motion of the valve stem and valve plate through a motion reversing mechanism, and realizes the switching function through the valve plate.

[0026] In order to ensure assembly margin, the gear reduction mechanism and the eccentric wheel usually have a certain amount of axial play. However, in the long run, the motion reversing mechanism and the eccentric wheel are prone to left and right deflection under long-term vibration conditions, that is, the axial directions of the eccentric wheel and the gear reduction mechanism are not perpendicular. This will further lead to poor motion transmission of the gear reduction mechanism, the eccentric wheel and the motion reversing mechanism. In severe cases, it will cause the EGR valve to get stuck and there is even a risk of valve leakage.

[0027] See also Figures 1-4 In order to solve the problem that the motion reversing mechanism and the eccentric wheel are prone to left and right deflection under long-term vibration conditions, the present application provides an EGR valve, which includes a motor 100, an output gear 200, a reduction gear 300, a transmission rod 400, a fixing assembly 500, a connecting rod 600, a motion reversing mechanism 700, an elastic preload member 800, a valve stem 910 and a valve plate 920. The output gear 200 is arranged at the output end of the motor 100, the reduction gear 300 and the output gear 200 are meshed and connected, and the rotation radius of the reduction gear 300 is greater than the rotation radius of the output gear 200, so as to reduce the output speed of the motor 100.

[0028] One end of the valve stem 910 is connected to the motion reversing mechanism 700, and the other end is connected to the valve plate 920. The axial direction of the valve stem 910 is perpendicular to the axial direction of the transmission rod 400. The motion reversing mechanism 700 can drive the valve plate 920 to move linearly through the valve stem 910 to open or close the valve.

[0029] The transmission rod 400 and the reduction gear 300 are coaxially arranged and fixedly connected, and the transmission rod 400 and the fixed assembly 500 are movably matched along the axial direction of the transmission rod 400. One end of the connecting rod 600 is connected to the end of the transmission rod 400 away from the reduction gear 300, and the other end is connected to the motion reversing mechanism 700. The connecting rod 600 can rotate around the axial direction of the transmission rod 400, and drive the valve stem 910 and the valve plate 920 to move in a straight line along a direction perpendicular to the axis of the transmission rod 400 through the motion reversing mechanism 700.

[0030] It should be noted that the fixing assembly 500 is sleeved on the outer circumference of the transmission rod 400 , and the output gear 200 and the reduction gear 300 are both disposed in the fixing assembly 500 .

[0031] Specifically, in one embodiment, Figure 2 and Figure 3As shown, the motion reversing mechanism 700 includes a first bearing 710, a moving block 720 and a limit sleeve (not shown in the figure). The moving block 720 is provided with an elongated slot 721. The outer ring of the first bearing 710 is movably arranged in the elongated slot 721. The length direction of the elongated slot 721 is perpendicular to the axial direction of the valve stem 910. The first bearing 710 can slide along the length direction of the elongated slot 721 with the moving block 720, and the first bearing 710 and the elongated slot 721 are limited in the width direction.

[0032] The limiting sleeve is arranged on the outer peripheral side of the valve stem 910, and the valve stem 910 can only move along its own axial direction relative to the limiting sleeve. The connecting rod 600 is connected to the inner ring of the first bearing 710. When the connecting rod 600 rotates around the axial direction of the transmission rod 400, the end of the connecting rod 600 connected to the first bearing 710 decomposes the rotation into sliding along the length direction of the elongated slot 721 and the moving block 720 as a whole moves linearly along the axial direction of the valve stem 910.

[0033] However, the present invention is not limited thereto. In other embodiments, the motion reversing mechanism 700 may also be a crank slider mechanism or other structures, which are not listed here one by one.

[0034] like Figure 1 and Figure 2 As shown, one end of the elastic preload member 800 abuts against the fixing assembly 500 , and the other end directly or indirectly abuts against the transmission rod 400 .

[0035] It should be noted that the fixing assembly 500 includes a shell 520 and a second bearing 530. The shell 520 is sleeved on the outer peripheral side of the transmission rod 400, and the output gear 200 and the reduction gear 300 are both arranged in the shell 520. One end of the elastic preload member 800 abuts against the second bearing 530, and the second bearing 530 is sleeved on the transmission rod 400 and fixedly connected to the shell 520.

[0036] It should be noted that abutment includes two situations: non-fixed connection and fixed connection. Specifically, the elastic preload member 800 is fixedly connected to or not fixedly connected to the fixed component 500, and the elastic preload member 800 is fixedly connected to or not fixedly connected to the transmission rod 400. In addition, the fixed connection includes various connection methods such as clamping and welding.

[0037] Obviously, the non-fixed connection mode is conducive to the disassembly and assembly of the elastic preload member 800 , and the fixed connection mode is conducive to increasing the assembly strength of the elastic preload member 800 .

[0038] Furthermore, it should be noted that the elastic preload member 800 may directly abut against the transmission rod 400 , or may indirectly abut against the transmission rod 400 via the reduction gear 300 .

[0039] The elastic preload member 800 can apply an elastic preload force to the transmission rod 400 and the connecting rod 600 to move toward the motion reversing mechanism 700, and stop the connecting rod 600 on the side of the motion reversing mechanism 700 close to the transmission rod 400 to prevent the motion reversing mechanism 700 from deflecting axially relative to the transmission rod 400.

[0040] Because the elastic preload member 800 can push the connecting rod 600 to stop on one side of the motion reversing mechanism 700 via the transmission rod 400, when the motion reversing mechanism 700 deflects or tends to deflect, the stopping action of the connecting rod 600 prevents the motion reversing mechanism 700 from deflecting significantly. Furthermore, because the elastic preload member 800 itself has a certain elastic deformation capacity, even if the motion reversing mechanism 700 deflects to a certain extent, the elastic preload member 800 can push the motion reversing mechanism 700 to quickly reset.

[0041] Such an arrangement not only facilitates smooth motion transmission of the transmission rod 400 , the connecting rod 600 and the motion reversing mechanism 700 , but also reduces the probability of EGR valve getting stuck and the risk of valve plate 920 leaking.

[0042] In one embodiment, if Figure 4 As shown, the connecting rod 600 is disc-shaped, and the connecting rod 600 is in contact with the motion reversing mechanism 700 at all axial locations around the transmission rod 400, that is, the connecting rod 600 is in contact with the motion reversing mechanism 700 at all circumferential locations.

[0043] With such an arrangement, the deflection of the motion reversing mechanism 700 in any direction can be prevented by the connecting rod 600 , thereby greatly improving the activity stability of the motion reversing mechanism 700 .

[0044] However, the present invention is not limited thereto. In other embodiments, the connecting rod 600 may also be in a ring-shaped or radial shape, etc., which are not listed here one by one.

[0045] In one embodiment, if Figure 1 and Figure 2 As shown, the elastic preload member 800 is a wave spring.

[0046] It should be noted that the wave spring is referred to as a wave spring, which can be a single thin metal ring with several peaks and valleys, or a superposition of multiple thin metal rings with several peaks and valleys.

[0047] Wave springs can be used in situations where the load and deformation are not large and the axial preload required is small. By using wave springs, not only the weight of the elastic preload member 800 can be reduced, but also the installation space of the elastic preload member 800 can be reduced.

[0048] In another embodiment, the elastic preload member 800 may also be a compression spring or a spring structure.

[0049] In one embodiment, if Figure 2 As shown, the reduction gear 300 is fixedly sleeved on the outer peripheral side of the transmission rod 400, and along the axial direction of the transmission rod 400, the two ends of the transmission rod 400 respectively protrude from the two ends of the reduction gear 300, and the end of the transmission rod 400 protruding away from the motion reversing mechanism 700 is defined as the first end 410, and the end of the transmission rod 400 protruding toward the motion reversing mechanism 700 is defined as the second end 420. The transmission rod 400 abuts against the elastic preload member 800 through the first end 410, and the transmission rod 400 is connected to the connecting rod 600 through the second end 420.

[0050] The reduction gear 300 is fixedly mounted on the outer peripheral side of the transmission rod 400, which is beneficial to reducing the assembly steps of the EGR valve, thereby reducing the assembly error of the EGR valve, and the elastic preload member 800 directly acts on the transmission rod 400, which can improve the accuracy of the transmission rod 400 in transmitting the elastic preload force.

[0051] Furthermore, in one embodiment, if Figure 1 and Figure 2 As shown, the elastic pre-tightening member 800 is movably sleeved on the outer peripheral side of the first end portion 410 .

[0052] In this way, the elastic preload member 800 can be prevented from axial bending.

[0053] However, the present invention is not limited thereto. In other embodiments, the elastic preload member 800 may also be directly connected to the end of the transmission rod 400 .

[0054] Furthermore, in one embodiment, if Figure 2 As shown, a first step structure 430 is provided on the outer peripheral side of the transmission rod 400 , and the elastic preload member 800 abuts against the first step structure 430 .

[0055] In one embodiment, if Figure 2 As shown, a second step structure 440 is provided on the outer peripheral side of the transmission rod 400, and the step surface of the second step structure 440 faces the side close to the motion reversing mechanism 700. The EGR valve also includes a limiting structure 510, which is fixedly connected to the fixing assembly 500. When the transmission rod 400 moves a preset distance in the direction close to the motion reversing mechanism 700, the limiting structure 510 can stop at the step surface of the second step structure 440 to prevent the transmission rod 400 from continuing to move in the direction close to the motion reversing mechanism 700.

[0056] Such a configuration can prevent the transmission rod 400 from driving the connecting rod 600 to excessively squeeze the motion reversing mechanism 700, thereby causing excessive friction between the connecting rod 600 and the motion reversing mechanism 700. That is, it is conducive to the active cooperation between the connecting rod 600 and the motion reversing mechanism 700.

[0057] Specifically, in one embodiment, the limiting structure 510 is annular, and the inner ring of the limiting structure 510 is movably sleeved on the outer circumference of the transmission rod 400 , and the outer ring of the limiting structure 510 is fixedly installed on the fixing assembly 500 .

[0058] Such a configuration is beneficial for uniform force on all parts of the second step structure 440 and prevents the transmission rod 400 from deflecting.

[0059] However, the present invention is not limited thereto. In other embodiments, the limiting structure 510 may also be in the shape of a bump.

[0060] Furthermore, in one embodiment, when the limiting structure 510 stops at the step surface of the second step structure 440 , a fitting gap exists between the end surface of the connecting rod 600 and the end surface of the motion reversing mechanism 700 .

[0061] In this way, the friction between the connecting rod 600 and the motion reversing mechanism 700 can be reduced.

[0062] It should be noted that the fitting clearance cannot be too large, otherwise it will easily cause the motion reversing mechanism 700 to deflect. Preferably, the fitting clearance between the connecting rod 600 and the motion reversing mechanism 700 is between 0.1 mm and 2 mm.

[0063] The present application also provides an exhaust gas recirculation system, which includes the EGR valve described in any one of the above embodiments.

[0064] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0065] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of patent protection for the present application shall be determined by the appended claims.

[0066] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying 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.

[0067] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0068] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0069] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0070] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0071] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are intended only to describe specific embodiments and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

Claims

1. An EGR valve, characterized in that: The invention comprises a transmission rod (400), a fixing assembly (500), a connecting rod (600), a motion reversing mechanism (700), a valve stem (910) and an elastic preload member (800), wherein the transmission rod (400) and the fixing assembly (500) are movably matched along the axial direction of the transmission rod (400), one end of the connecting rod (600) is connected to the transmission rod (400), and the other end is connected to the motion reversing mechanism (700), and the valve stem (910) is connected to the motion reversing mechanism (700), and the connecting rod (600) can rotate around the axial direction of the transmission rod (400), and drive the valve stem (910) to move linearly along a direction perpendicular to the axis of the transmission rod (400) through the motion reversing mechanism (700); One end of the elastic pre-tightening member (800) abuts against the fixing assembly (500), and the other end directly or indirectly abuts against the transmission rod (400). The elastic pre-tightening member (800) can apply an elastic pre-tightening force to the transmission rod (400) and the connecting rod (600) to move toward the motion reversing mechanism (700), and causes the connecting rod (600) to stop at a side of the motion reversing mechanism (700) close to the transmission rod (400), so as to prevent the motion reversing mechanism (700) from deflecting in the axial direction relative to the transmission rod (400).

2. The EGR valve according to claim 1, characterized in that The connecting rod (600) is disc-shaped, and all axial locations of the connecting rod (600) surrounding the transmission rod (400) are in stoppered engagement with the motion reversing mechanism (700).

3. The EGR valve according to claim 1, characterized in that The elastic pre-tightening member (800) is a wave spring, a compression spring or a spring sheet structure.

4. The EGR valve according to claim 1, characterized in that A second step structure (440) is provided on the outer peripheral side of the transmission rod (400), and the step surface of the second step structure (440) is arranged toward the side close to the motion reversing mechanism (700). The EGR valve also includes a limiting structure (510), and the limiting structure (510) is fixedly connected to the fixing assembly (500). When the transmission rod (400) moves toward a direction close to the motion reversing mechanism (700), the limiting structure (510) can stop at the step surface of the second step structure (440).

5. The EGR valve according to claim 4, characterized in that: The limiting structure (510) is annular, and the inner ring of the limiting structure (510) is movably sleeved on the outer peripheral side of the transmission rod (400), and the outer ring of the limiting structure (510) is fixedly installed on the fixing component (500).

6. The EGR valve according to claim 4, characterized in that When the limiting structure (510) stops at the step surface of the second step structure (440), a fitting clearance exists between the end surface of the connecting rod (600) and the end surface of the motion reversing mechanism (700).

7. The EGR valve according to claim 1, characterized in that The invention also includes a motor (100), an output gear (200) and a reduction gear (300), wherein the output gear (200) is arranged at the output end of the motor (100), the reduction gear (300) and the output gear (200) are meshed and connected, and the rotation radius of the reduction gear (300) is greater than the rotation radius of the output gear (200) to reduce the output speed of the motor (100), and the transmission rod (400) and the reduction gear (300) are coaxially arranged and fixedly connected.

8. The EGR valve according to claim 7, characterized in that: The reduction gear (300) is fixedly sleeved on the outer peripheral side of the transmission rod (400), and along the axial direction of the transmission rod (400), the two ends of the transmission rod (400) respectively protrude from the two ends of the reduction gear (300), and the end of the transmission rod (400) protruding away from the motion reversing mechanism (700) is defined as the first end (410), and the end of the transmission rod (400) protruding toward the motion reversing mechanism (700) is defined as the second end (420). The transmission rod (400) abuts against the elastic preload member (800) through the first end (410), and the transmission rod (400) is connected to the connecting rod (600) through the second end (420).

9. The EGR valve according to claim 8, characterized in that: The elastic pre-tightening member (800) is movably sleeved on the outer peripheral side of the first end portion (410).

10. An exhaust gas recirculation system, characterized in that: The EGR valve comprises the EGR valve according to any one of claims 1 to 9.

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