EGR valve

Abstract

The EGR valve comprises a contact pin, a shell, a transmission assembly, a driving motor and a vibration reduction part, the transmission assembly is connected to the output end of the driving motor, the shell covers the outer sides of the driving motor and the transmission assembly, the vibration reduction part is arranged at the end, close to the transmission assembly, of the driving motor, and the vibration reduction part is clamped between the peripheral side of the driving motor and the inner wall of the shell; therefore, the driving motor can be tightly matched with the shell through the vibration reduction part. According to the EGR valve, a series of problems caused by motor vibration are solved.

Description

Technical Field

[0001] This application relates to the technical field of valve bodies, and particularly to an EGR valve. Background Art

[0002] As the power source of an EGR valve (Exhaust Gas Recirculation valve), the motor plays a crucial role in the normal operation of the EGR valve. During the long-term operation of the EGR valve, problems such as the expansion of the pin holes on the motor housing, the fracture of the motor pins, the wear of the motor fixing ribs, and the loosening of the motor rear cover are likely to occur due to the vibration of the motor itself. Summary of the Utility Model

[0003] Based on this, it is necessary to provide an EGR valve to solve a series of problems caused by motor vibration.

[0004] The EGR valve provided by this application includes a housing, a transmission assembly, a driving motor, and a vibration damping member. The transmission assembly is connected to the output end of the driving motor. The housing covers the outside of the driving motor and the transmission assembly. The vibration damping member is arranged at one end of the driving motor close to the transmission assembly, and the vibration damping member is clamped between the outer peripheral side of the driving motor and the inner wall of the housing, so that the driving motor can be tightly fitted with the housing through the vibration damping member.

[0005] In one embodiment, the inner wall of the housing is provided with a first limiting protrusion protruding outwards. The driving motor is provided with a first limiting groove corresponding to the first limiting protrusion. The vibration damping member is provided with a first avoiding groove corresponding to the first limiting protrusion. The first avoiding groove and the first limiting groove are correspondingly arranged and communicated. The first limiting protrusion can pass through the first avoiding groove and be clamped in the first limiting groove to prevent the driving motor and the vibration damping member from rotating around their own axes.

[0006] In one embodiment, the driving motor is provided with a second limiting protrusion protruding outwards. The inner wall of the housing is provided with a second limiting groove corresponding to the second limiting protrusion. The vibration damping member is provided with a second avoiding groove corresponding to the second limiting protrusion. The second avoiding groove and the second limiting groove are correspondingly arranged and communicated. The second limiting protrusion can pass through the second avoiding groove and be clamped in the second limiting groove to prevent the driving motor and the vibration damping member from rotating around their own axes.

[0007] In one embodiment, the inner peripheral side of the vibration damping member is provided with a first protrusion, and a plurality of first protrusions are arranged along the circumferential direction of the vibration damping member. The vibration damping member is in radial limiting cooperation with the driving motor through the first protrusions.

[0008] In one embodiment, the outer peripheral side of the vibration damping member is provided with a second protrusion, and a plurality of second protrusions are arranged along the circumferential direction of the vibration damping member. The vibration damping member is in radial limiting cooperation with the inner wall of the housing through the second protrusions.

[0009] In one embodiment, the shock absorber includes an inner convex section and an outer convex section. The inner convex section and the outer convex section are arranged alternately along the circumferential direction of the shock absorber and connected. The inner convex section protrudes towards the side of the shock absorber close to the drive motor relative to the adjacent outer convex section, and the outer convex section protrudes towards the side of the shock absorber close to the inner wall of the housing relative to the adjacent inner convex section.

[0010] In one embodiment, the shock absorber further includes a transition section, and the inner convex section and the outer convex section are smoothly connected through the transition section.

[0011] In one embodiment, the hardness of the housing material is greater than the hardness of the shock absorber material.

[0012] In one embodiment, the shock absorber is sleeved on the outer peripheral side of the drive motor;

[0013] In one embodiment, the shock absorber and the outer shell of the drive motor are integrally formed;

[0014] In one embodiment, the shock absorber and the housing are integrally formed.

[0015] In one embodiment, a magnetic shielding ring is fixedly arranged on the outer peripheral side of the drive motor, and one end of the shock absorber away from the transmission component abuts against the magnetic shielding ring.

[0016] In one embodiment, the transmission component includes a motor gear, a reduction gear, and an output gear. The motor gear is fixedly sleeved on the output shaft of the drive motor and rotates synchronously with the output shaft of the drive motor. The motor gear is meshed with the output gear through the reduction gear, so that the output speed of the drive motor is reduced and the output torque is increased.

[0017] Compared with the prior art, for the EGR valve provided in this application, with such a setting, on the one hand, the axial friction force of the drive motor can be increased to prevent the drive motor from moving axially relative to the housing (resulting in the actuator failure due to the drive motor hitting the motor end cover). On the other hand, when the gap between the housing and the drive motor increases due to wear, the shock absorber can increase the radial friction force of the drive motor and reduce the vibration amplitude of the drive motor relative to the housing. Moreover, the shock absorber increases the contact area between the drive motor and the housing, and the drive motor can transmit vibrations to the housing through the shock absorber, and the transmission effect of the drive motor is better, and the protection effect of the housing on the drive motor is also better.

[0018] Furthermore, after installing the shock absorber, the vibration of the drive motor is conducted to the housing through the shock absorber, thereby reducing the frictional force on the ribs on the inner wall of the housing, increasing the service life of the ribs and the pins on the inner wall of the housing; at the same time, the contact section length between the shock absorber and the drive motor is relatively long, which can better ensure the coaxiality of the drive motor and the housing, promote more uniform wear of the ribs, and increase the service life; in addition, even after the ribs of the housing are worn, the shock absorber can still bear the vibration of the drive motor, reduce the force at the pin, and protect the pins from damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0020] Figure 1 Schematic structural diagram of an EGR valve according to an embodiment provided by the present application;

[0021] Figure 2 Exploded view of an EGR valve according to an embodiment provided by the present application;

[0022] Figure 3 Schematic structural diagram of a shock absorber according to Embodiment 2 provided by the present application;

[0023] Figure 4 Schematic structural diagram of a shock absorber according to Embodiment 3 provided by the present application.

[0024] Reference numerals: 100, pin; 200, housing; 210, first housing; 220, second housing; 230, motor end cover; 300, transmission assembly; 310, motor gear; 320, reduction gear; 321, large-diameter gear; 322, small-diameter gear; 330, output gear; 400, drive motor; 410, first limiting groove; 420, magnetic shielding ring; 500, shock absorber; 510, first avoidance groove; 520, first protrusion; 530, second protrusion; 540, inner convex section; 550, outer convex section; 560, transition section; 600, bottom surface sealing ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The motor serves as the power source of the EGR valve (exhaust gas recirculation valve), and the motor plays a crucial role in the normal operation of the EGR valve. During the long-term operation of the EGR valve, the motor is prone to problems such as the expansion of the pin holes on the motor housing, the fracture of the motor pins, the wear of the motor fixing ribs, and the loosening of the motor rear cover due to its own vibration.

[0026] Please refer to Figures 1 - 4, To solve a series of problems caused by motor vibration, the present application provides an EGR valve, which includes a pin 100, a housing 200, a transmission assembly 300, a drive motor 400, and a vibration damping member 500. The transmission assembly 300 is connected to the output end of the drive motor 400. The input torque of the output shaft of the drive motor 400 is amplified by the transmission assembly 300 and then output, thereby driving the opening and closing of the EGR valve.

[0027] Specifically, in one embodiment, as Figure 2 shown, the transmission assembly 300 includes a motor gear 310, a reduction gear 320, and an output gear 330. The motor gear 310 is fixedly sleeved on the output shaft of the drive motor 400 and rotates synchronously with the output shaft of the drive motor 400. The motor gear 310 is meshed and connected to the output gear 330 through the reduction gear 320, so that the output speed of the drive motor 400 is reduced and the output torque is increased.

[0028] In this way, it is beneficial for the drive motor 400 to increase the output torque through the transmission assembly 300, thereby better controlling the opening and closing of the EGR valve.

[0029] However, it is not limited to this. In other embodiments, the transmission assembly 300 can also be a worm and worm gear transmission structure or a belt transmission structure, etc., which will not be listed one by one here.

[0030] Furthermore, in one embodiment, as Figure 2 shown, the reduction gear 320 includes a large-diameter gear 321 and a small-diameter gear 322 that are fixedly connected and coaxially arranged. The rotation radius of the large-diameter gear 321 is greater than that of the small-diameter gear 322, and the large-diameter gear 321 is meshed and connected to the motor gear 310, and the small-diameter gear 322 is meshed and connected to the output gear 330.

[0031] The housing 200 covers the outside of the drive motor 400 and the transmission assembly 300 to provide support and protection for the drive motor 400 and the transmission assembly 300.

[0032] In one embodiment, as Figure 1 and Figure 2 shown, the housing 200 includes a first housing 210 and a second housing 220. The first housing 210 covers the outside of the drive motor 400, and the second housing 220 covers the outside of the transmission assembly 300. The first housing 210 and the second housing 220 are fixedly connected (including but not limited to various connection methods such as detachable fixed connection, welding, and riveting).

[0033] With such a setting, it is beneficial for the assembly of the drive motor 400 and the transmission assembly 300 in the housing 200, reducing the manufacturing cost of the EGR valve.

[0034] Specifically, in one embodiment, the first housing 210 and the second housing 220 are detachably connected by fasteners such as bolts. Alternatively, in another embodiment, the first housing 210 and the second housing 220 are detachably snap-connected.

[0035] However, it is not limited thereto. In other embodiments, the first housing 210 and the second housing 220 may also be integrally formed by 3D printing or integral casting.

[0036] Furthermore, in one embodiment, as Figure 1 and Figure 2 shown, the housing 200 further includes a motor end cover 230. The motor end cover 230 is hermetically disposed at one end of the drive motor 400 away from the transmission assembly 300 and is connected to the housing 200. The motor end cover 230 is mounted on the housing 200 through a bottom surface sealing ring 600.

[0037] In this way, when the drive motor 400 is assembled, it can be mounted inside the housing 200 through the end of the housing 200 away from the transmission assembly 300, and then the motor end cover 230 is covered to achieve the sealing of the EGR valve.

[0038] One end of the pin 100 is connected to the drive motor 400, and the other end extends toward the direction close to the transmission assembly 300 and is inserted into the housing 200.

[0039] The damping member 500 is disposed at one end of the drive motor 400 close to the transmission assembly 300. The damping member 500 is clamped between the outer peripheral side of the drive motor 400 and the inner wall of the housing 200, so that the drive motor 400 is tightly fitted with the housing 200 through the damping member 500.

[0040] With such a setting, on the one hand, the axial friction force of the drive motor 400 can be increased to prevent the drive motor 400 from moving axially relative to the housing 200 (resulting in the drive motor 400 hitting the motor end cover 230) and causing the actuator to fail. On the other hand, when the gap between the housing 200 and the drive motor 400 increases due to wear, the damping member 500 can increase the radial friction force of the drive motor 400 and reduce the vibration amplitude of the drive motor 400 relative to the housing 200. Moreover, the damping member 500 increases the contact area between the drive motor 400 and the housing 200. The drive motor 400 can transmit the vibration to the housing 200 through the damping member 500, and the transmission effect of the drive motor 400 is better, and the protection effect of the housing 200 on the drive motor 400 is also better.

[0041] Further, after installing the shock absorber 500, the vibration of the driving motor 400 is conducted by the shock absorber 500 to the housing 200, thereby reducing the frictional force on the rib, increasing the service life of the rib on the inner wall of the housing 200 and the pin 100; at the same time, the contact section length between the shock absorber 500 and the driving motor 400 is relatively long, which can better ensure the coaxiality of the driving motor 400 and the housing 200, promote more uniform wear of the rib, and increase the service life; in addition, after the rib of the housing 200 is worn, the shock absorber 500 can still bear the vibration of the driving motor 400, reduce the force at the pin 100, and protect the pin 100 from damage.

[0042] In one embodiment, the shock absorber 500 is made of a plastic with high temperature resistance and certain stiffness. Specifically, the material of the shock absorber 500 can be polyhexamethylene adipamide, polyether ether ketone, polyvinylidene fluoride, etc., which are not listed one by one here.

[0043] In this way, the shock absorber 500 can well absorb the vibration of the driving motor 400. When it is difficult to press-fit the shock absorber 500 and the driving motor 400 with interference, the shock absorber 500 can be reinstalled after being heated by a temperature control box. Moreover, the shock absorber 500 can be processed by 3D printing or injection molding. It has a low price, a wide range of selectable materials, convenient processing, and simple installation.

[0044] In one embodiment, as Figure 2 shown, a first limiting protrusion (not shown in the figure) protruding from the inner wall of the housing 200 is provided. The driving motor 400 is provided with a first limiting groove 410 corresponding to the first limiting protrusion. The shock absorber 500 is provided with a first avoiding groove 510 corresponding to the first limiting protrusion. The first avoiding groove 510 and the first limiting groove 410 are correspondingly arranged and communicated. The first limiting protrusion can pass through the first avoiding groove 510 and be clamped in the first limiting groove 410 to prevent the driving motor 400 and the shock absorber 500 from rotating around their own axes.

[0045] With such a setting, the driving motor 400 and the shock absorber 500 can be prevented from rotating relative to the housing 200. Combining with the fact that the shock absorber 500 can reduce the relative vibration between the driving motor 400 and the housing 200, therefore, with such a setting, the overall displacement of the driving motor 400 relative to the housing 200 can be minimized to the greatest extent, and then the driving motor 400 and each component connected to the driving motor 400 (including but not limited to the pin 100) can be effectively protected. For example, the pin 100 can be prevented from twisting or breaking.

[0046] In another embodiment, the drive motor 400 is provided with a second limiting protrusion (not shown in the figure) protruding therefrom. A second limiting groove (not shown in the figure) corresponding to the second limiting protrusion is provided on the inner wall of the housing 200. The damping member 500 is provided with a second avoidance groove (not shown in the figure) corresponding to the second limiting protrusion. The second avoidance groove and the second limiting groove are correspondingly arranged and communicated. The second limiting protrusion can pass through the second avoidance groove and be clamped in the second limiting groove to prevent the drive motor 400 and the damping member 500 from rotating around their own axial directions. Further, in one embodiment, an outer circular chamfer is provided at one end of the first limiting groove 410 close to the transmission assembly 300. In this way, it is convenient to press-fit the damping member 500 into the housing 200 with an interference fit. And, an inner circular chamfer is provided on the opposite side of the first limiting groove 410, which is convenient for sleeving the damping member 500 on the drive motor 400 in advance.

[0047] In one embodiment, the radial depth of the first limiting groove 410 is determined by the radial height of the first limiting protrusion on the housing 200. The depth of the first limiting groove 410 should be slightly less than or equal to the height of the first limiting protrusion to avoid the problem of skew of the damping member 500 after installation.

[0048] In one embodiment, as Figure 2 shown, a magnetic shielding ring 420 is fixedly arranged on the outer peripheral side of the drive motor 400. One end of the damping member 500 away from the transmission assembly 300 abuts against the magnetic shielding ring 420.

[0049] In this way, the magnetic shielding ring 420 can position the assembly of the damping member 500 and prevent the damping member 500 from moving in the direction away from the transmission assembly 300.

[0050] In one embodiment, as Figure 2 shown, the damping member 500 is sleeved on the outer peripheral side of the drive motor 400. And, the damping member 500 can be in interference fit, transition fit or clearance fit with the drive motor 400.

[0051] Specifically, the damping member 500 can be fixed to the outer peripheral side of the drive motor 400 by friction, or the damping member 500 can also be fixedly welded to the drive motor 400.

[0052] In this way, the damping member 500 and the drive motor 400 can be assembled first, and then the assembled whole can be assembled with the housing 200.

[0053] In another embodiment, the damping member 500 and the drive motor 400 are integrally formed.

[0054] Or, in yet another embodiment, the damping member 500 can be integrally formed with the inner wall of the housing 200.

[0055] In this way, the assembly difficulty of the EGR valve is reduced.

[0056] Embodiment 1

[0057] As shown in Figure 2 Figure, a first protrusion 520 is provided on the inner circumferential side of the shock absorber 500, and a plurality of first protrusions 520 are arranged along the circumferential direction of the shock absorber 500. The shock absorber 500 is radially limited and cooperated with the driving motor 400 through the first protrusion 520.

[0058] With such a setting, the vibration of the driving motor 400 is sequentially transmitted to the housing 200 through the first protrusion 520 and the shock absorber 500.

[0059] Furthermore, in an embodiment, the outer circumferential side of the shock absorber 500 is a smooth curved surface and is arranged in contact with the inner wall of the housing 200.

[0060] Specifically, the first protrusion 520 is in a strip shape extending along the axial direction of the driving motor 400, or the first protrusion 520 is in a dot shape, a wavy shape or other shapes, which will not be listed one by one here.

[0061] Embodiment 2

[0062] As shown in Figure 3 Figure, a second protrusion 530 is provided on the outer circumferential side of the shock absorber 500, and a plurality of second protrusions 530 are arranged along the circumferential direction of the shock absorber 500. The shock absorber 500 is radially limited and cooperated with the inner wall of the housing 200 through the second protrusion 530.

[0063] With such a setting, the vibration of the driving motor 400 is sequentially transmitted to the housing 200 through the shock absorber 500 and the second protrusion 530.

[0064] Furthermore, in an embodiment, the inner circumferential side of the shock absorber 500 is a smooth curved surface and is arranged in contact with the outer surface of the driving motor 400.

[0065] Specifically, the second protrusion 530 is in a strip shape extending along the axial direction of the driving motor 400, or the second protrusion 530 is in a dot shape, a wavy shape or other shapes, which will not be listed one by one here.

[0066] Embodiment 3

[0067] As shown in Figure 4 Figure, the shock absorber 500 includes an inner convex section 540 and an outer convex section 550. The inner convex section 540 and the outer convex section 550 are alternately arranged and connected along the circumferential direction of the shock absorber 500. The inner convex section 540 protrudes toward the side of the shock absorber 500 close to the driving motor 400 relative to the adjacent outer convex section 550, and the outer convex section 550 protrudes toward the side of the shock absorber 500 close to the inner wall of the housing 200 relative to the adjacent inner convex section 540.

[0068] That is to say, the inner convex section 540 is concave and the outer convex section 550 is convex.

[0069] With such a setting, the vibration damping member 500 can be limited and cooperated with the driving motor 400 through the inner convex section 540, and can be limited and cooperated with the inner wall of the housing 200 through the outer convex section 550, which greatly improves the assembly strength of the inner and outer rings of the vibration damping member 500 and is beneficial to the transmission of the vibration of the driving motor 400.

[0070] Further, in an embodiment, the vibration damping member 500 further includes a transition section 560, and the inner convex section 540 and the outer convex section 550 are smoothly connected through the transition section 560.

[0071] Specifically, the transition section 560 can be arc-shaped, S-curved or other curved surfaces, etc., which will not be listed one by one here.

[0072] It should be noted that Embodiment 1, Embodiment 2 and Embodiment 3 can be combined with each other.

[0073] During the installation process of the EGR valve, the vibration damping member 500 comes into contact with the housing 200 first. The material hardness of the housing 200 is greater than that of the vibration damping member 500, so the vibration damping member 500 deforms, and the deformation mainly occurs at the protrusions (including the first protrusion 520, the second protrusion 530, the inner convex section 540 and the outer convex section 550).

[0074] It should be noted that the material hardness of the housing 200 is greater than that of the vibration damping member 500, which can ensure the strength of the housing 200 while giving full play to the vibration damping effect of the vibration damping member 500 and improving the overall performance of the EGR valve.

[0075] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brief description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0076] The above-described embodiments only represent several implementation manners of the present application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

[0077] In the description of the present application, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the drawings. These 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. Therefore, it should not be construed as a limitation to the present application.

[0078] In addition, the terms "first" and "second" are used only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0079] In the present application, unless otherwise clearly specified and limited, the terms "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal connection or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0080] In the present application, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0081] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. 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.

[0082] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the specification of this application herein are only for the purpose of describing specific implementations and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

Claims

1. An EGR valve, characterized in that: The invention comprises a housing (200), a transmission assembly (300), a driving motor (400) and a vibration damping member (500), wherein the transmission assembly (300) is connected to the output end of the driving motor (400), the housing (200) is arranged on the outside of the driving motor (400) and the transmission assembly (300), the vibration damping member (500) is arranged at one end of the driving motor (400) close to the transmission assembly (300), and the vibration damping member (500) is clamped between the outer peripheral side of the driving motor (400) and the inner wall of the housing (200), so that the driving motor (400) can be tightly matched with the housing (200) through the vibration damping member (500).

2. The EGR valve according to claim 1, characterized in that: The inner wall of the housing (200) is provided with a first limiting protrusion which is protruded, the driving motor (400) is provided with a first limiting groove (410) corresponding to the first limiting protrusion, the vibration damping member (500) is provided with a first avoiding groove (510) corresponding to the first limiting protrusion, the first avoiding groove (510) and the first limiting groove (410) are correspondingly arranged and connected, and the first limiting protrusion can be passed through the first avoiding groove (510) and clamped in the first limiting groove (410) to prevent the driving motor (400) and the vibration damping member (500) from rotating around their own axes; Alternatively, the drive motor (400) is provided with a second limiting protrusion that is protruding, the inner wall of the shell (200) is provided with a second limiting groove corresponding to the second limiting protrusion, and the vibration damping component (500) is provided with a second avoidance groove corresponding to the second limiting protrusion, the second avoidance groove and the second limiting groove are correspondingly arranged and connected, and the second limiting protrusion can pass through the second avoidance groove and be clamped in the second limiting groove to prevent the drive motor (400) and the vibration damping component (500) from rotating around their own axes.

3. The EGR valve according to claim 1 or 2, characterized in that: A first protrusion (520) is provided on the inner circumferential side of the vibration damping member (500), and a plurality of the first protrusions (520) are arranged along the circumference of the vibration damping member (500). The vibration damping member (500) is radially limited and matched with the driving motor (400) through the first protrusions (520).

4. The EGR valve according to claim 1 or 2, characterized in that: A second protrusion (530) is provided on the outer peripheral side of the vibration damping member (500), and a plurality of the second protrusions (530) are arranged along the circumference of the vibration damping member (500). The vibration damping member (500) is radially limited and matched with the inner wall of the shell (200) through the second protrusions (530).

5. The EGR valve according to claim 1 or 2, characterized in that: The vibration damping member (500) comprises an inner convex section (540) and an outer convex section (550), wherein the inner convex section (540) and the outer convex section (550) are alternately arranged and connected along the circumference of the vibration damping member (500), wherein the inner convex section (540) is protruded relative to the adjacent outer convex section (550) toward a side of the vibration damping member (500) close to the drive motor (400), and the outer convex section (550) is protruded relative to the adjacent inner convex section (540) toward a side of the vibration damping member (500) close to the inner wall of the shell (200).

6. The EGR valve according to claim 5, characterized in that: The vibration damping member (500) further comprises a transition section (560), and the inner convex section (540) and the outer convex section (550) are smoothly connected via the transition section (560).

7. The EGR valve according to claim 1, characterized in that: The hardness of the material of the housing (200) is greater than the hardness of the material of the vibration damping member (500).

8. The EGR valve according to claim 1, characterized in that: The vibration damping member (500) is sleeved on the outer peripheral side of the driving motor (400); Alternatively, the vibration damping member (500) and the housing of the driving motor (400) are integrally formed; Alternatively, the vibration damping member (500) and the housing (200) are integrally formed.

9. The EGR valve according to claim 1, characterized in that: A magnetic protection ring (420) is fixedly provided on the outer peripheral side of the driving motor (400), and one end of the vibration damping member (500) away from the transmission assembly (300) abuts against the magnetic protection ring (420).

10. The EGR valve according to claim 1, characterized in that: The transmission assembly (300) comprises a motor gear (310), a reduction gear (320) and an output gear (330); the motor gear (310) is fixedly sleeved on the output shaft of the drive motor (400) and rotates synchronously with the output shaft of the drive motor (400); the motor gear (310) is meshedly connected to the output gear (330) via the reduction gear (320) so that the output speed of the drive motor (400) is reduced and the output torque is increased.

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