Valve actuator and exhaust gas recirculation valve

Abstract

The utility model relates to a valve actuator and an exhaust gas recirculation valve. The valve actuator comprises a motor, the motor comprises a shell and a rotating shaft, a shell cavity is formed in the shell, and the rotating shaft is installed in the shell cavity and is in running fit with the shell; the cover body is buckled on the shell, and a transmission cavity is defined by the cover body and the shell; the transmission part is located in the transmission cavity, the transmission part comprises a supporting part and an inner gear ring fixed to the supporting part, and the inner gear ring is in meshing transmission with the rotating shaft; and one end of the output shaft is fixed to the supporting part, the output shaft and the supporting part are of an integrated structure or are fixed in a split mode, and the other end of the output shaft extends out of the transmission cavity and is used for being connected with a controlled part in the valve. According to the technical scheme, by simplifying the transmission relation of the actuator, the transmission stability is improved while compact layout is provided, and the working effect is improved.

Description

Technical Field

[0001] This application relates to the field of vehicle control, and particularly to valve actuators and exhaust gas recirculation valves. Background Art

[0002] Exhaust Gas Recirculation refers to the process of returning a portion of the exhaust gas back to the combustion chamber to participate in combustion. This process can effectively improve the engine operating conditions. Exhaust gas recirculation is controlled by an exhaust gas recirculation valve (also known as an "EGR valve"). With the continuous improvement of control requirements, EGR valves have gradually evolved from pneumatic control to electric control.

[0003] Currently, the actuators of electronically controlled EGR valves use multi-stage external gear transmissions to meet the requirements of driving torque. However, the structure of multi-stage external gears not only directly leads to mechanical problems such as large occupied space and complex internal structure, but also causes control problems such as low control accuracy, slow dynamic response, and difficult control due to multi-stage transmissions. Therefore, there is room for improvement in the prior art. Summary of the Utility Model

[0004] This application provides a valve actuator and an exhaust gas recirculation valve, which simplify the transmission relationship of the actuator, provide a compact layout while improving the stability of transmission, and improve the working effect.

[0005] This application discloses a valve actuator, comprising:

[0006] A motor, including a housing and a rotating shaft. The interior of the housing is a housing cavity, and the rotating shaft is installed in the housing cavity and is rotationally fitted relative to the housing;

[0007] A cover body, which is buckled on the housing and forms a transmission cavity with the housing;

[0008] A transmission member, located in the transmission cavity. The transmission member includes a support portion and an internal gear ring fixed to the support portion. The internal gear ring is meshed and transmitted with the rotating shaft;

[0009] An output shaft, one end of which is fixed to the support portion. The output shaft and the support portion are of an integral structure or are fixedly separated. The other end of the output shaft extends out of the transmission cavity and is used to connect a controlled component in the valve.

[0010] The following also provides several optional ways, which are not additional limitations to the above general solution, but are only further supplements or optimizations. On the premise of no technical or logical contradictions, each optional way can be combined with the above general solution alone, or multiple optional ways can be combined with each other.

[0011] In one embodiment, the cooperation mode between the support portion and the output shaft is:

[0012] a) The support portion includes a radiation portion fixed to the outer periphery of the output shaft, and the radiation portion extends radially outward to connect to an axial end of the internal gear ring;

[0013] Or b) The support portion includes:

[0014] A bushing, the bushing is cylindrical, and the output shaft axially penetrates the bushing along the valve actuator and is fixed to the bushing;

[0015] A radiation portion, which extends radially outward from the bushing to connect to an axial end of the internal gear ring.

[0016] In one embodiment, a first mounting hole is provided on the housing, a second mounting hole is provided on the cover body, one end of the output shaft is fitted in the first mounting hole, and the other end penetrates the second mounting hole.

[0017] In one embodiment, both ends of the output shaft are respectively fitted with the first mounting hole and the second mounting hole through antifriction members, the antifriction members are sleeved on the output shaft, and the output shaft is provided with a stepped portion that cooperates with the antifriction members;

[0018] The end of the antifriction member facing the stepped portion turns outwards to form a limiting side edge, and the stepped portion abuts against the side edge of the first mounting hole or the second mounting hole through the limiting side edge for axial limitation.

[0019] In one embodiment, the internal gear ring and the output shaft are coaxially arranged, and the output shaft is eccentrically arranged compared with the rotating shaft.

[0020] In one embodiment, a single-stage transmission is adopted between the rotating shaft and the output shaft, a driving gear is fixed to an end of the rotating shaft located in the transmission cavity, and the driving gear meshes directly with the internal gear ring.

[0021] In one embodiment, the transmission ratio between the driving gear and the internal gear ring is 1:4 to 1:10.

[0022] In one embodiment, the motor further includes a substrate for driving the motor and a plug-in member electrically connected to the substrate;

[0023] The substrate is arranged in the transmission cavity, and a first avoidance hole for avoiding the rotating shaft and a second avoidance hole for avoiding the output shaft are formed on the substrate;

[0024] The housing has an offset portion relative to the rotating shaft, and the plug-in member is embedded on the offset portion.

[0025] In one embodiment, the rotation axis and the output axis are arranged in the same direction, and the ratio range between the length L1 of the valve actuator in the axial direction of the rotation axis and the length L2 in the radial direction of the rotation axis is 0.7 to 1.3.

[0026] In one embodiment, both ends of the output axis are respectively fitted with the housing and the cover body through antifriction members, and the antifriction members are sleeved on the output axis.

[0027] The present application also discloses an exhaust gas recirculation valve, which includes a valve body, a valve core movably arranged in the valve body, and the valve actuator described in the present application. The valve core is used as a controlled component and is linked to the output axis of the valve actuator.

[0028] The present application also discloses a power unit, which includes an intake pipeline and an exhaust pipeline communicated with the combustion chamber. The power unit further includes the exhaust gas recirculation valve described in the present application. The exhaust gas recirculation valve has a recirculation state of communicating the intake pipeline and the exhaust pipeline and a corresponding disconnected state.

[0029] The technical solution disclosed in the present application simplifies the transmission relationship of the actuator, saves internal space, and provides a compact layout on the premise of meeting the design requirements. At the same time, it avoids problems such as unstable transmission process, inaccurate control process, and slow dynamic response caused by multi-stage transmission, improves the stability of transmission, and improves the working effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] 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 drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0031] Figure 1 It is a schematic structural diagram of a valve actuator in an embodiment of the present application;

[0032] Figure 2 is Figure 1 a schematic structural diagram of the valve actuator in another perspective in;

[0033] Figure 3 is Figure 2 a schematic cross-sectional view taken along line A-A in;

[0034] Figure 4 It is an exploded schematic diagram of a valve actuator in an embodiment of the present application;

[0035] Figure 5 is Figure 4Explosion schematic diagram of the middle valve actuator from another perspective (the first seal and the motor part are omitted).

[0036] The reference numerals of each component are as follows:

[0037] 100, motor; 110, housing; 111, first mounting hole; 120, rotating shaft; 130, driving gear; 140, substrate; 141, first avoidance hole; 142, second avoidance hole; 150, plug-in component; 160, offset part;

[0038] 200, cover; 201, second mounting hole; 210, transmission cavity;

[0039] 300, transmission part; 310, support part; 311, bushing; 312, radiation part; 320, internal gear ring; 321, transmission tooth;

[0040] 400, output shaft; 401, step part; 402, reduced diameter part; 410, antifriction part; 411, limiting edge; 420, gap adjusting washer;

[0041] 501, first seal; 502, second seal. Detailed implementation manners

[0042] To make the above objects, features, and advantages of the present application more obvious and understandable, the following describes the detailed implementation manners of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0043] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or there may also be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of the present application are only for the purpose of illustration and do not represent the only implementation manner.

[0044] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0045] In this application, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may mean that the first feature is in direct contact with the second feature, or the first feature is in indirect contact with the second feature through an intermediate medium. Moreover, the first feature being "above", "over" or "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" or "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0046] Unless otherwise defined, all technical and scientific terms used in the description of this application have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. The terms used in the description of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the description of this application includes any and all combinations of one or more of the related listed items.

[0047] To obtain a compact layout while improving the stability of the transmission, refer to Figures 1 to 3 As shown, one embodiment of this application discloses a valve actuator, including:

[0048] A motor 100, including a housing 110 and a rotating shaft 120 rotatably installed in the housing 110. The interior of the housing 110 is a housing cavity, and the rotating shaft 120 is installed in the housing cavity and is rotationally fitted relative to the housing 110;

[0049] A cover body 200, buckled on the housing 110 and enclosing a transmission cavity 210 with the housing 110;

[0050] A transmission member 300, located in the transmission cavity 210. The transmission member 300 includes a support portion 310 and an internal gear ring 320 fixed to the support portion 310. The internal gear ring 320 meshes and transmits with the rotating shaft 120;

[0051] An output shaft 400; one end is fixed to the support portion 310. The output shaft 400 and the support portion 310 are of an integral structure or are fixedly connected separately. The other end of the output shaft 400 extends out of the transmission cavity 210 and is used to connect a controlled component in the valve.

[0052] In this embodiment, as far as the motor 100 itself is concerned, it can be combined with the existing technology, for example, magnets or windings that match each other are set in the housing 110 and on the rotating shaft 120, and power output is achieved through the rotating shaft 120, while the transmission member 300 transmits power between the rotating shaft 120 and the output shaft 400. Compared with the external gear transmission structure, the inner gear ring 320 of this embodiment can arrange more transmission teeth for meshing under the same space occupation, thereby increasing the setting range of the transmission ratio; the rotating shaft 120 can also be set inside the inner gear ring 320 to further optimize the overall size of the transmission structure. Overall, the transmission member 300 can simplify the transmission relationship, save internal space and provide a compact layout while meeting the design requirements; at the same time, it avoids the problems of unstable transmission process, inaccurate control process, slow dynamic response, etc. caused by multi-stage transmission, improves the stability of the transmission, and improves the working effect.

[0053] For details about the configuration of the transmission member 300, see Figures 3 to 5 As shown, the transmission member 300 is rotatably mounted in the transmission chamber. The support portion 310 includes a sleeve 311 and a radiation portion 312, wherein the output shaft 400 passes through the sleeve 311 along the axial direction of the valve actuator and is fixed to the sleeve 311, and the radiation portion 312 extends radially outward from the sleeve 311 to connect to the axial end of the inner gear ring 320. The sleeve 311 is cylindrical. In other embodiments, the support portion 310 may also be provided with no sleeve, for example, the support portion 310 includes a radiation portion 312 fixed to the outer periphery of the output shaft 400, and the radiation portion 312 extends radially outward to connect to the axial end of the inner gear ring 320.

[0054] The radiation portion 312 can be partially hollowed out, or the end of the inner gear ring 320 in the axial direction can be closed. The inner gear ring 320 includes an annular body and a transmission tooth 321 arranged on the annular body. The annular body is open at both ends in the axial direction and one of the ends is connected to the support portion 310. The support portion 310 and the annular body form a cylinder with one end closed. The transmission tooth 321 of the inner gear ring 320 is arranged on the inner side wall of the annular body. In the circumferential direction of the inner gear ring 320, the tooth tip portions of the transmission tooth 321 are arranged at intervals along the inner side wall of the annular body, and the tooth root portions of the transmission tooth 321 are adjacent to or abut against each other along the inner side wall of the annular body. In the axial direction of the inner gear ring 320, the inner gear ring 320 has a certain thickness to ensure the meshing size between the transmission tooth 321 and the rotating shaft 120 to meet the transmission torque requirements. Further, in the axial direction of the inner gear ring 320, both ends of the transmission tooth 321 extend to the side edge of the annular body. In order to control the overall size, the radiation portion 312 is substantially plate-shaped and the thickness of the inner gear ring 320 is greater than or equal to the thickness of the radiation portion 312 to achieve a balance between structural strength and overall size.

[0055] A drive gear 130 is fixed at the end of a transmission cavity 210 where a rotating shaft 120 is located. The drive gear 130 meshes with transmission teeth 321 of an internal gear ring 320. The drive gear 130 in the meshing state is located inside a cylinder body formed by a support portion 310 and an annular body, that is, in the axial direction of the internal gear ring 320, the thickness of the annular body of the internal gear ring 320 is greater than or equal to the thickness of the drive gear 130, so as to prevent the drive gear 130 from being exposed outside the internal gear ring 320 in the meshing state. The above arrangement can improve the meshing strength and achieve a compact layout. Further, referring to Figure 3 , a gap is provided between the drive gear 130 and a radiation portion 312. The drive gear 130 directly meshes with the transmission teeth 321 of the internal gear ring 320, that is, a single-stage transmission is adopted between the rotating shaft 120 and an output shaft 400.

[0056] The transmission member 300 can maintain a mating relationship with the housing 110 and the cover body 200 by itself, or the transmission member 300 maintains a mating relationship with the housing 110 and the cover body 200 through the output shaft 400. In one embodiment, a first mounting hole 111 is provided on the housing 110, a second mounting hole 201 is provided on the cover body 200, one end of the output shaft 400 is fitted in the first mounting hole 111, and the other end penetrates through the second mounting hole 201. The first mounting hole 111 and the second mounting hole 201 position the axial position of the output shaft 400. The first mounting hole 111 is a through hole or a blind hole. Correspondingly, the output shaft 400 penetrates or does not penetrate the first mounting hole 111. The output shaft 400 and the transmission member 300 can be of an integral structure and obtained by an integral molding process, or can be obtained by separate molding and then assembled. Both ends of the output shaft 400 are respectively fitted with a friction reducing member 410 in the first mounting hole 111 or the second mounting hole 201. The friction reducing member 410 is sleeved on the output shaft 400. In the figure, the friction reducing member 410 is an oil-free bearing. In addition to reducing the mating resistance between the output shaft 400, the housing 110 and the cover body 200, the friction reducing member 410 can also be used to limit the axial position of the output shaft 400. The output shaft 400 is provided with a step portion 401 that cooperates with the friction reducing member 410. The end of the friction reducing member 410 facing the step portion 401 turns outwards to form a limiting side edge 411. The step portion 401 abuts against the side edge of the first mounting hole 111 or the second mounting hole 201 through the limiting side edge 411 to achieve the axial limit of the output shaft 400. The multi-functional design of the friction reducing member 410 can further reduce the number of components and improve the integration degree. Further, a shim washer 420 can be provided between the step portion 401 and the friction reducing member 410 to reduce the tolerance requirement and improve the mating accuracy. The shim washer 420 can also be made of a self-lubricating material to reduce the mating resistance.

[0057] Regarding the cooperation between the transmission member 300 and the rotating shaft 120, in one embodiment, the internal gear ring 320 is coaxially arranged with the output shaft 400, and the output shaft 400 is eccentrically arranged relative to the rotating shaft 120, achieving a compact layout while ensuring the transmission ratio. In other embodiments, the output shaft 400 can also be aligned with the rotating shaft 120. Further, the transmission ratio between the driving gear 130 and the internal gear ring 320 is 1:4 to 1:10 to adapt to the output torque capacity of the motor 100 and the driving torque requirement of the output shaft 400 under the single-stage transmission setting. Combining Figure 3 , the rotating shaft 120 and the output shaft 400 are arranged in the same direction, and the ratio range between the length L1 of the valve actuator in the axial direction of the rotating shaft 120 and the length L2 in the radial direction of the rotating shaft 120 is 0.7 to 1.3. Thanks to the optimization of the transmission structure, the valve actuator in this embodiment can achieve regular and compact external structural dimensions.

[0058] In one embodiment, the motor 100 further includes a substrate 140 for driving the motor 100 and a plug-in member 150 electrically connected to the substrate 140. The substrate 140 is provided with wires and / or control circuits to realize the driving of the motor 100. The wires and / or control circuits are connected to the windings of the electrodes to transmit energy. In the figure, the substrate 140 is arranged in the transmission cavity 210, and the substrate 140 is provided with a first avoidance hole 141 for avoiding the rotating shaft 120 and a second avoidance hole 142 for avoiding the output shaft 400. The first avoidance hole 141 and the second avoidance hole 142 can be independently arranged or integrally connected. The size of the substrate 140 is adapted to the size of the transmission cavity 210 to provide a more compact layout. The substrate 140 is mounted on the housing 110 through a plurality of fasteners. The housing 110 has an offset portion 160 relative to the rotating shaft 120, and the plug-in member 150 is embedded in the offset portion 160. The plug-in member 150 and the substrate 140 are respectively located on both sides of the housing 110. The plug-in member 150 penetrates through the offset portion 160 and is connected to the substrate 140. The plug-in member 150 can be offset relative to the main body of the motor 100 to facilitate the connection of external circuits.

[0059] The cover body 200 and the housing 110 are hermetically fitted, that is, the transmission cavity 210 is hermetically arranged. The side edges of the cover body 200 and the housing 110 are hermetically buckled with each other through a first sealing member 501. The output shaft 400 is provided with a second sealing member 502 for cooperating with the cover body 200. The second sealing member 502 is sleeved on the output shaft 400. The output shaft 400 is provided with a reduced-diameter portion 402 to facilitate the cooperation with the second sealing member 502. The outer peripheral surface of the reduced-diameter portion 402 is smoothly arranged to avoid damaging the second sealing member 502 during the assembly process.

[0060] In terms of specific materials, the driving gear 130 can be made of powder metallurgy to ensure strength and hardness. The driving gear 130 can be fixedly connected to the rotating shaft 120 by means of welding, bonding, etc., to ensure that all the power of the motor 100 can be output to the transmission member 300 via the rotating shaft 120. The transmission member 300 is formed by split molding. Among them, the output shaft 400 is made of powder metallurgy to ensure that the output end for cooperating with the controlled component meets the strength requirements; the transmission member 300 is made of a polymer material to improve the wear resistance of the gear and increase the service life. The polymer material of the transmission member 300 needs to meet the requirements of wear resistance, stability and certain strength, such as polyamide, polycarbonate, polyoxymethylene, modified polyphenylene ether and thermoplastic polyester, etc. Inorganic materials can also be used for further reinforcement, such as glass fiber or carbon fiber. The components made of polymer materials can be injection molded, and the performance of the components can be improved by the multi-gating process during the molding process. Among them, the output shaft 400 and the transmission member 300 need to be closely matched to ensure stable power output.

[0061] Based on the above, in one embodiment of the present application, an exhaust gas recirculation valve is also disclosed, which includes a valve body, a valve core movably arranged in the valve body, and the valve actuator in the present application. The valve core serves as a controlled component and is linked to the output shaft 400 of the valve actuator. For the valve actuator, refer to the above description. Other parts of the exhaust gas recirculation valve can be implemented in combination with the prior art and will not be elaborated here.

[0062] Furthermore, in one embodiment of the present application, a power unit is also disclosed, which includes an intake pipeline and an exhaust pipeline communicating with the combustion chamber. The power unit also includes the exhaust gas recirculation valve in the present application. The exhaust gas recirculation valve has a recirculation state of communicating the intake pipeline and the exhaust pipeline and a corresponding disconnected state. For the exhaust gas recirculation valve, refer to the above description. Other parts of the power unit can be implemented in combination with the prior art and will not be elaborated here.

[0063] While ensuring the output torque, the valve actuator in the present application can greatly reduce the volume of the actuator, so as to be more widely adapted to more scenarios. It has a series of beneficial effects such as a large design space (for example, more motor models can be selected), fewer parts, simple structure, stable transmission, light weight, convenient assembly, high yield rate, and good economy.

[0064] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combinations of these technical features do not conflict, they should all be considered as the scope described in this specification. When the technical features in different embodiments are shown in the same drawing, it can be regarded that the drawing also discloses the combined examples of the respective embodiments involved.

[0065] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patented application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the appended claims.

Claims

1. A valve actuator, characterized in that: include: The motor comprises a housing and a rotating shaft, wherein the housing has a housing cavity, and the rotating shaft is installed in the housing cavity and rotates relative to the housing; A cover body, which is buckled on the shell and forms a transmission cavity with the shell; A transmission member is located in the transmission cavity, the transmission member comprises a support portion and an inner gear ring fixed to the support portion, the inner gear ring is meshed with the rotating shaft for transmission; An output shaft has one end fixed to the support portion, the output shaft and the support portion are an integral structure or are fixed separately, and the other end of the output shaft extends out of the transmission cavity and is used to connect to a controlled component in the valve.

2. The valve actuator according to claim 1, characterized in that: The supporting part and the output shaft cooperate in the following manner: a) the support portion comprises a radiation portion fixed to the outer periphery of the output shaft, the radiation portion radially extending outwardly and connected to the axial end of the inner gear ring; or b) the support portion comprises: A shaft sleeve, wherein the shaft sleeve is cylindrical, and the output shaft passes through the shaft sleeve along the axial direction of the valve actuator and is fixed to the shaft sleeve; The radiation portion extends radially outward from the shaft sleeve and is connected to an axial end portion of the inner gear ring.

3. The valve actuator according to claim 2, characterized in that: The shell body is provided with a first mounting hole, the cover body is provided with a second mounting hole, one end of the output shaft is matched with the first mounting hole, and the other end passes through the second mounting hole.

4. The valve actuator according to claim 3, characterized in that: The two ends of the output shaft are respectively matched with the first mounting hole and the second mounting hole through the friction reducing member, the friction reducing member is sleeved on the output shaft, and the output shaft is provided with a step portion that cooperates with the friction reducing member; The end of the friction reducing member is turned outward toward the step portion to form a limiting side edge, and the step portion is abutted against the side edge of the first mounting hole or the second mounting hole through the limiting side edge to be axially limited.

5. The valve actuator according to claim 3, characterized in that: The inner gear ring is coaxially arranged with the output shaft, and the output shaft is eccentrically arranged compared to the rotating shaft.

6. The valve actuator according to any one of claims 1 to 5, characterized in that: A single-stage transmission is adopted between the rotating shaft and the output shaft. A driving gear is fixed to the end of the rotating shaft located in the transmission cavity. The driving gear is directly meshed with the inner gear ring.

7. The valve actuator according to claim 6, characterized in that: The transmission ratio between the driving gear and the inner ring gear is 1:4 to 1:

10.

8. The valve actuator according to claim 7, characterized in that: The motor further comprises a substrate for driving the motor and a connector electrically connected to the substrate; The base plate is arranged in the transmission cavity, and a first avoidance hole for avoiding the rotating shaft and a second avoidance hole for avoiding the output shaft are opened on the base plate; The housing is provided with an offset portion relative to the rotating shaft, and the plug-in connector is embedded in the offset portion.

9. The valve actuator according to claim 8, characterized in that: The rotating shaft and the output shaft are arranged in the same direction, and a ratio between a length L1 of the valve actuator in the axial direction of the rotating shaft and a length L2 in the radial direction of the rotating shaft is in a range of 0.7 to 1.

3.

10. An exhaust gas recirculation valve, characterized in that: It comprises a valve body, a valve core movably arranged in the valve body, and the valve actuator according to any one of claims 1 to 9, wherein the valve core serves as a controlled component and is linked to an output shaft of the valve actuator.

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