Electric EGR valve

Abstract

The electric EGR valve comprises a valve body, a valve cavity is formed in the valve body, and the valve body is provided with a valve port communicating with the valve cavity; the valve core is arranged in the valve cavity; the linkage mechanism is connected with the valve core; the driving mechanism comprises a transmission mechanism and a brushless motor driving the transmission mechanism to act, an output shaft of the brushless motor is connected with the power input end of the transmission mechanism, the power output end of the transmission mechanism is in linkage with the linkage mechanism, and therefore the linkage mechanism drives the valve element to move in the direction close to or away from the valve port so as to open and close the valve port. The brushless motor comprises a motor shell, a rotor, a magnetic ring synchronously rotating with the rotor and a Hall sensor electrically connected with the magnetic ring, the rotor is arranged in the motor shell, the magnetic ring and the Hall sensor are both located outside the motor shell, the magnetic ring is installed on the output shaft, and the magnetic pole of the magnetic ring is consistent with that of the rotor. The Hall sensor is prevented from being damaged due to high temperature (such as 120 DEG C or above) generated by the motor, the reliability of the Hall sensor is improved, and reliable work of the brushless motor in the electric EGR valve is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of EGR valves, in particular to an electric EGR valve. BACKGROUND

[0002] In an engine, exhaust gas recirculation is a technology of recycling a part of the burned exhaust gas to the intake passage to burn again with fresh air in the engine cylinder. The exhaust gas recirculation valve (EGR valve) is the core product of the exhaust gas recirculation module, which mainly plays a role in regulating the exhaust gas flow.

[0003] With the gradual improvement of the life and reliability requirements of EGR valves in the automobile industry, brushless motor EGR valves have gradually appeared. However, under high load working conditions, the motor itself will generate heat, which will cause the Hall sensor in the EGR valve to be damaged due to high temperature. CONTENT OF THE UTILITY MODEL

[0004] Therefore, it is necessary to provide an electric EGR valve which can avoid damage of the Hall sensor due to high temperature.

[0005] The present application provides an electric EGR valve, which comprises a valve body, an internal valve cavity, a valve port connected with the valve cavity, a valve core arranged in the valve cavity, a linkage mechanism connected with the valve core, a driving mechanism comprising a transmission mechanism and a brushless motor driving the transmission mechanism, an output shaft of the brushless motor connected with a power input end of the transmission mechanism, a power output end of the transmission mechanism connected with the linkage mechanism, so as to drive the valve core to move towards or away from the valve port to open or close the valve port, the brushless motor comprising a motor shell, a rotor driving the output shaft to rotate, a magnetic ring rotating synchronously with the rotor, and a Hall sensor electrically connected with the magnetic ring, the rotor being arranged in the motor shell, the magnetic ring and the Hall sensor being located outside the motor shell, the magnetic ring being installed on the output shaft and consistent with the magnetic pole of the rotor.

[0006] In one embodiment, the transmission mechanism comprises a driving gear, a driven gear and a transmission shaft arranged side by side and spaced apart from the output shaft of the brushless motor, the driving gear being installed on the output shaft of the brushless motor, the driven gear being installed on the transmission shaft and engaged with the driving gear, and the linkage mechanism being connected with the transmission shaft.

[0007] In one of the embodiments, the linkage mechanism comprises an eccentric wheel, a valve rod and a bearing, the eccentric wheel is installed on the transmission shaft, and the eccentric wheel is provided with an installation shaft for installing the bearing, the installation shaft is arranged side by side with the transmission shaft, and both are arranged crosswise with the valve rod, the first end of the valve rod is located in the valve cavity and connected with the valve core, the second end of the valve rod is provided with a sliding groove for accommodating the bearing, and the bearing drives the valve core to move back and forth along the axial direction of the valve rod under the driving of the eccentric wheel, and the valve port is located on the movement path of the valve core.

[0008] In one of the embodiments, an elastic member is further arranged to make the valve core always have a movement trend towards the valve port, and the elastic member acts on the valve core.

[0009] In one of the embodiments, the output shaft of the brushless motor has a shaft section with a non-circular cross section, and the magnetic ring has a insertion hole matched with the outer peripheral wall of the shaft section for inserting the shaft section.

[0010] In one of the embodiments, the outer peripheral wall of the shaft section comprises circular arc sections and straight sections connected in sequence along the circumferential direction of the shaft section, and the straight sections extend along the axial direction of the shaft section.

[0011] In one of the embodiments, the brushless motor comprises a stator located in the motor shell, the stator is located on the outer peripheral side of the rotor and fixedly connected to the motor shell.

[0012] In one of the embodiments, the stator is connected to the motor shell by thermal fitting, or the stator is press-fitted to the motor shell by interference.

[0013] In one of the embodiments, a cover shell and an outer shell are further arranged, the cover shell is formed with a receiving cavity for accommodating the brushless motor, the outer shell is at least partially located between the cover shell and the valve body, and together with the cover shell forms an accommodation chamber, the accommodation chamber and the receiving cavity are arranged in sequence along the axial direction of the output shaft, and the magnetic ring, the Hall sensor and the transmission mechanism are located in the accommodation chamber.

[0014] In one of the embodiments, the outer side of the cover shell is provided with a connector for electrically connecting with the brushless motor, the connector, the cover shell, the outer shell and the valve body are connected by a first connecting member, and the position of the cover shell away from the connector is connected with the outer shell and the valve body by a second connecting member.

[0015] In one embodiment, the connector is provided with a first through hole for the first connecting member to pass through, the cover is provided with a first threaded hole threadedly connected to the first connecting member and a first through hole for the second connecting member to pass through, the outer shell is provided with a second through hole for the first connecting member to pass through and a second through hole for the second connecting member to pass through, the valve body is provided with a third through hole for the first connecting member to pass through and a second threaded hole threadedly connected to the second connecting member, the first connecting member is a bolt, and the bolt passes through the first through hole, the first threaded hole, the second through hole and the third through hole in sequence and is threadedly connected to the nut.

[0016] Compared with the prior art, in the electric EGR valve provided by the present application, since the magnetic poles of the magnetic ring are the same as those of the rotor of the brushless motor, and the magnetic ring rotates synchronously with the rotor, the magnetic pole position of the magnetic ring detected by the Hall sensor is consistent with the magnetic pole position of the rotor. The position information of the rotor can be determined by cooperating with the Hall sensor and the magnetic ring arranged on the outside of the motor housing. The Hall sensor is arranged outside the motor housing to avoid the Hall sensor being damaged by the high temperature (such as above 120°C) generated by the motor, thereby improving the reliability of the Hall sensor, ensuring the reliable operation of the brushless motor in the electric EGR valve, and can operate in a high temperature environment above 130°C. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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.

[0018] Figure 1 This is a schematic structural diagram of an electric EGR valve according to an embodiment of the present application;

[0019] Figure 2 for Figure 1 sectional view of

[0020] Figure 3 for Figure 2 A partial enlarged view of point I in the middle;

[0021] Figure 4 for Figure 1 A cross-sectional view at the first connecting member;

[0022] Figure 5 for Figure 4 A partial enlarged view of position II in the middle;

[0023] Figure 6 for Figure 1 A cross-sectional view at the second connecting member;

[0024] Figure 7 is a partial structural schematic view of the valve body; Figure 1

[0025] Figure 8 is a partial structural schematic view of the valve body; Figure 7

[0026] Figure 9 is a sectional view of the output shaft and magnetic ring assembly structure in the magnetic valve; Figure 8

[0027] Reference signs: 1, valve body; 11, valve cavity; 111, valve port; 12, third through hole; 13, second threaded hole; 14, accommodating cavity; 15, partition plate; 2, valve core; 3, linkage mechanism; 31, eccentric wheel; 311, mounting shaft; 32, valve rod; 321, sliding groove; 322, sliding block; 33, bearing; 35, bushing; 36, sealing ring; 4, driving mechanism; 41, transmission mechanism; 411, driving gear; 412, driven gear; 413, transmission shaft; 42, brushless motor; 420, output shaft; 4201, shaft segment; 4202, circular arc segment; 4203, straight segment; 421, motor shell; 422, rotor; 423, magnetic ring; 424, stator; 5, elastic member; 6, cover shell; 60, accommodating cavity; 61, first threaded hole; 62, first through hole; 7, outer shell; 71, second through hole; 72, second through hole; 8, connector; 81, first through hole; 91, first connecting piece; 92, second connecting piece; 93, nut; 01, accommodating chamber; 02, PCB. DETAILED DESCRIPTION

[0028] In order to make the above objectives, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described in detail below in combination with the drawings. In the following description, a lot of specific details are set forth in order 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 spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0029] ​​​It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right", "side", "top", "bottom" and similar expressions used in the specification of this application are only used to describe the various example structural parts and elements of this application, but these terms are used here for the purpose of convenience of explanation and are determined based on the example orientations shown in the accompanying drawings, and do not represent the only implementation method. Since the embodiments disclosed in the application can be set in different directions, these terms indicating directions are only for illustration and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0030] 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.

[0031] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it can mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it can mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. When a first feature is "below," "below," or "below" a second feature, it can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is lower in level than the second feature.

[0032] It should be noted that "axial arrangement" means that the overall arrangement direction is along the axial direction, including but not limited to axial extension, and may form an angle with the axial direction.

[0033] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification 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 specification of this application includes any and all combinations of one or more of the relevant listed items.

[0034] like Figures 1 to 9As shown, the present application discloses an electric EGR valve. The electric EGR valve includes a valve body 1, a valve core 2, a linkage mechanism 3, and a drive mechanism 4. The valve body 1 has a valve cavity 11 disposed therein and a valve port 111 communicating with the valve cavity 11.

[0035] like Figure 1 and Figure 2 As shown, the valve core 2 is disposed within the valve chamber 11 and is connected to the drive mechanism 4 via a linkage mechanism 3. Specifically, the valve core 2 is connected to the linkage mechanism 3. Specifically, the drive mechanism 4 includes a transmission mechanism 41 and a brushless motor 42 that drives the transmission mechanism 41. The output shaft 420 of the brushless motor 42 is connected to the power input of the transmission mechanism 41, and the power output of the transmission mechanism 41 is connected to the linkage mechanism 3. As a result, the drive mechanism 4 drives the valve core 2, through the linkage mechanism 3, toward or away from the valve port 111 to open and close the valve port 111.

[0036] like Figure 2 and Figure 6 As shown, the brushless motor 42 includes a motor housing 421, a rotor 422 that drives the output shaft 420 to rotate, a magnetic ring 423 that rotates synchronously with the rotor 422, and a Hall sensor electrically connected to the magnetic ring 423. The rotor 422 is arranged in the motor housing 421, and the magnetic ring 423 is located outside the motor housing 421 and is installed on the output shaft 420, and is consistent with the magnetic pole of the rotor 422.

[0037] It is understood that because the magnetic ring 423 and the rotor 422 of the brushless motor 42 have the same magnetic poles and rotate synchronously with each other, the magnetic pole position of the magnetic ring 423 detected by the Hall sensor is consistent with the magnetic pole position of the rotor 422. The Hall sensor, located outside the motor housing 421, cooperates with the magnetic ring 423 to determine the position of the rotor 422, thereby determining the position of the valve core 2. The Hall sensor is located outside the motor housing 421 to prevent damage to the Hall sensor due to the high temperature (e.g., above 120°C) generated by the motor, thereby improving the reliability of the Hall sensor and ensuring reliable operation of the brushless motor 42 in the electric EGR valve, and allowing operation in high temperature environments above 130°C.

[0038] In one embodiment, the Hall sensor is located inside the motor housing 421 . In another embodiment, the Hall sensor is located outside the motor housing 421 .

[0039] In one embodiment, if Figure 2 、 Figure 6 and Figure 8As shown, the transmission mechanism 41 comprises a driving gear 411 and a driven gear 412, the driving mechanism 4 further comprises a transmission shaft 413 arranged in parallel and spaced apart from the output shaft 420 of the brushless motor 42, the driving gear 411 is mounted on the output shaft 420 of the brushless motor 42, the driven gear 412 is mounted on the transmission shaft 413 and engaged with the driving gear 411, and the linkage mechanism 3 is connected with the transmission shaft 413. In another embodiment, the transmission mechanism 41 further comprises a transmission gear, the driving gear 411 is engaged with the driven gear 412 through the transmission gear.

[0040] It can be understood that the transmission mechanism adopts a gear transmission mechanism, and compared with the existing worm gear, the transmission ratio is large and the output torque is large, which better meets the working condition requirements of high load.

[0041] As shown in Figure 2 , Figure 3 , Figure 7 and Figure 8 , the linkage mechanism 3 comprises an eccentric wheel 31 and a valve rod 32. The valve rod 32 is arranged in cross with the transmission shaft 413, specifically, the valve rod 32 is perpendicular to the transmission shaft 413. The first end of the valve rod 32 is located in the valve cavity 11 and connected with the valve core 2. The second end of the valve rod 32 is provided with a sliding groove 321. The eccentric wheel 31 is mounted on the transmission shaft 413, and the eccentric wheel 31 is provided with a mounting shaft 311 arranged in parallel and spaced apart from the transmission shaft 413 and a bearing 33 sleeved on the mounting shaft 311. The bearing 33 is located in the sliding groove 321 and driven by the eccentric wheel 31 to drive the sliding block 322 and the valve core 2 to move back and forth along the axial direction of the valve rod 32, and the valve port 111 is located on the movement path of the valve core 2. It can be understood that the linkage mechanism 3 can realize the transmission of power from the transmission mechanism 41 to the valve core 2. In another embodiment, the eccentric wheel 31 adopts a cam.

[0042] In order to constrain the magnetic ring 423, as shown in Figure 9 , the output shaft 420 of the brushless motor 42 has a shaft section 4201 with a non-circular cross section, and the magnetic ring 423 has a insertion hole matched with the outer wall of the shaft section 4201 for inserting the shaft section 4201, so that the magnetic ring 423 is constrained on the shaft section 4201 of the output shaft 420, and then the magnetic ring 423 and the rotor 422 are synchronously rotated with the output shaft 420. In another embodiment, the magnetic ring 423 is fixedly connected with the rotor 422 and arranged coaxially, and then the magnetic ring 423 and the rotor 422 are synchronously rotated with the output shaft 420.

[0043] In an embodiment, the cross section of the shaft segment 4201 is elliptical. In the embodiment, the outer peripheral wall of the shaft segment 4201 comprises circular arc segments 4202 and straight segments 4203 connected in sequence along the circumferential direction of the shaft segment 4201, and the straight segments 4203 extend along the axial direction of the shaft segment 4201. In another embodiment, there are two or more straight segments 4203, and the straight segments 4203 can be arranged adjacently or a circular arc segment 4202 can be arranged between two adjacent straight segments 4203.

[0044] As shown in Figure 2 , Figure 3 , Figure 7 and Figure 8 , in an embodiment, the second end of the valve rod 32 is provided with a sliding block 322, and a sliding groove 321 is arranged on the sliding block 322. In the embodiment, the valve rod 32 is arranged along the up-down direction, and the first end is the lower end of the valve rod 32, and the second end is the upper end of the valve rod 32. The above-mentioned driven gear 412 is located above the driving gear 411.

[0045] As shown in Figure 2 , the above-mentioned electric EGR valve further comprises an elastic member 5 for enabling the valve core 2 to always have a movement tendency towards the valve port 111, and the elastic member 5 acts on the valve core 2. In the embodiment, a containing cavity 14 is formed in the valve body 1 and located above the valve cavity 11, the containing cavity 14 and the valve cavity 11 are separated by a partition plate 15, the partition plate 15 is provided with a through hole for the lower end of the valve rod 32 to pass into the valve cavity 11, and the elastic member 5 is a spring located in the containing cavity 14 and sleeved on the outer periphery of the valve rod 32, the upper end of the spring is in contact with the sliding block 322, and the lower end of the spring is in contact with the top surface of the partition plate 15.

[0046] In order to block the above-mentioned through hole, the outer periphery of the above-mentioned valve rod 32 is sleeved with a bushing 35 and a sealing ring 36 arranged in sequence along the axial direction of the valve rod 32, so as to realize the sealed connection between the valve rod 32 and the inner peripheral wall of the through hole. In an embodiment, the sealing ring 36 is located above the bushing 35. In another embodiment, the sealing ring 36 is located below the bushing 35.

[0047] As shown in Figure 2 and Figure 6 , the above-mentioned brushless motor 42 further comprises a stator 424 located in the motor shell 421, and the stator 424 is located on the outer peripheral side of the rotor 422 and is fixedly connected to the motor shell 421. In an embodiment, the stator 424 is connected to the motor shell 421 by thermal fitting. In another embodiment, the stator 424 is press-fitted on the motor shell 421 by interference.

[0048] It can be understood that the above fixing mode can more efficiently transfer the heat of the brushless motor 42 to the outside of the motor shell 421 to accelerate the heat dissipation of the brushless motor 42, so that the efficiency of the brushless motor 42 is higher, the output torque is improved, and the reliability is better. The above motor shell 421 is a metal shell, such as a die-cast aluminum.

[0049] As shown in Figures 1 to 5 The electric EGR valve further includes a cover shell 6 and an outer shell 7. The cover shell 6 is provided with a receiving cavity 60 for accommodating the brushless motor 42. The outer shell 7 is at least partially located between the cover shell 6 and the valve body 1, and a containing chamber 01 is formed between the cover shell 6 and the outer shell 7. The containing chamber 01 and the receiving cavity 60 are arranged along the axial direction of the output shaft 420 in sequence. The magnetic ring 423, the Hall sensor (not shown in the figure) and the transmission mechanism 41 are all located in the containing chamber 01. In this way, the containing chamber can protect the transmission mechanism 41 and the magnetic ring 423.

[0050] The outer side of the cover shell 6 is provided with a connector 8 electrically connected with the brushless motor 42. The connector 8, the cover shell 6, the outer shell 7 and the valve body 1 are connected through a first connecting piece 91. The position of the cover shell 6 away from the connector 8 is connected with the outer shell 7 and the valve body 1 through a second connecting piece 92. It can be understood that the connection of the connector 8, the cover shell 6, the outer shell 7 and the valve body 1 is realized through the first connecting piece 91, and the connection of the cover shell 6, the outer shell 7 and the valve body 1 is realized through the second connecting piece 92.

[0051] In an embodiment, the connector 8, the cover shell 6, the outer shell 7 and the valve body 1 are correspondingly provided with threaded holes matched with the first connecting piece 91. In this embodiment, the connector 8 is provided with a first through hole 81 for the first connecting piece 91 to pass through. The cover shell 6 is provided with a first threaded hole 61 threadedly connected with the first connecting piece 91 and a first through hole 62 for the second connecting piece 92 to pass through. The outer shell 7 is provided with a second through hole 71 for the first connecting piece 91 to pass through and a second through hole 72 for the second connecting piece 92 to pass through. The valve body 1 is provided with a third through hole 12 for the first connecting piece 91 to pass through and a second threaded hole 13 threadedly connected with the second connecting piece 92. The first connecting piece 91 is a bolt. After the bolt passes through the first through hole 81, the first threaded hole 61, the second through hole 71 and the third through hole 12 in sequence, the bolt is threadedly connected with a nut 93.

[0052] It can be understood that the connection of the connector 8, the cover shell 6, the outer shell 7 and the valve body 1 is realized through a bolt in sequence, which improves the reliability of the connection of the four. The connection of the cover shell 6, the outer shell 7 and the valve body 1 is realized through a second connecting piece 92 in sequence, which improves the reliability of the connection of the three. Through the arrangement mode of the first connecting piece 91 and the second connecting piece, the problem of insufficient anti-vibration ability caused by using connecting pieces to realize the connection of the two is avoided, and the anti-vibration ability of the electric EGR valve is improved.

[0053] In addition, the accommodating chamber 01 is provided with a PCB 02 connected with the shell 6 through the connector 8, which is convenient for positioning the connector 8 and facilitating the soldering between the connector 8 and the PCB 02.

[0054] In the embodiment, the first connecting pieces 91 are located above the second connecting pieces 92, and there are two first connecting pieces 91 which are arranged side by side and spaced apart. There are multiple second connecting pieces 92 which are arranged along the circumference of the brushless motor 42 and spaced apart, further improving the reliability of the connection between the shell 6, the housing 7 and the valve body 1.

[0055] The technical features of the above-described embodiments can be combined in any manner. In order to make the description simple, all possible combinations of the technical features in the above-described embodiments are not described, but as long as the combinations of the technical features do not contradict, they should be considered as falling within the scope of the present disclosure.

[0056] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent application scope. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all fall within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. An electric EGR valve, characterized in that: include: A valve body (1) is provided with a valve cavity (11) therein, and the valve body (1) has a valve port (111) communicating with the valve cavity (11); A valve core (2) is disposed in the valve cavity (11); A linkage mechanism (3) connected to the valve core (2); The driving mechanism (4) comprises a transmission mechanism (41) and a brushless motor (42) for driving the transmission mechanism (41), wherein the output shaft (420) of the brushless motor (42) is connected to the power input end of the transmission mechanism (41), and the power output end of the transmission mechanism (41) is linked to the linkage mechanism (3), thereby driving the valve core (2) to move toward or away from the valve port (111) through the linkage mechanism (3) to open and close the valve port (111); the brushless motor ( 42) comprises a motor housing (421), a rotor (422) driving the output shaft (420) to rotate, a magnetic ring (423) rotating synchronously with the rotor (422), and a Hall sensor electrically connected to the magnetic ring (423), wherein the rotor (422) is arranged in the motor housing (421), the magnetic ring (423) and the Hall sensor are both located outside the motor housing (421), and the magnetic ring (423) is installed on the output shaft (420) and is aligned with the magnetic pole of the rotor (422).

2. The electric EGR valve according to claim 1, characterized in that: The transmission mechanism (41) comprises a driving gear (411), a driven gear (412), and a transmission shaft (413) arranged side by side and spaced apart from the output shaft (420) of the brushless motor (42); the driving gear (411) is mounted on the output shaft (420) of the brushless motor (42); the driven gear (412) is mounted on the transmission shaft (413) and meshes with the driving gear (411); and the linkage mechanism (3) is connected to the transmission shaft (413).

3. The electric EGR valve according to claim 2, characterized in that: The linkage mechanism (3) includes an eccentric wheel (31), a valve stem (32) and a bearing (33). The eccentric wheel (31) is mounted on the transmission shaft (413), and a mounting shaft (311) for mounting the bearing (33) is provided on the eccentric wheel (31). The mounting shaft (311) and the transmission shaft (413) are arranged side by side and are both arranged to cross the valve stem (32). The first end of the valve stem (32) is located in the valve cavity (11) and is connected to the valve core (2). The second end of the valve stem (32) is provided with a slide groove (321) for the bearing (33) to be located therein. The bearing (33) drives the valve core (2) to move back and forth along the axial direction of the valve stem (32) under the rotation drive of the eccentric wheel (31). The valve port (111) is located on the movement path of the valve core (2).

4. The electric EGR valve according to claim 1, characterized in that: It also includes an elastic member (5) that enables the valve core (2) to always have a tendency to move toward the valve port (111), and the elastic member (5) acts on the valve core (2).

5. The electric EGR valve according to claim 1, characterized in that: The output shaft (420) of the brushless motor (42) has a shaft segment (4201) with a non-circular cross section, and the magnetic ring (423) has a socket that matches the outer peripheral wall of the shaft segment (4201) for inserting the shaft segment (4201).

6. The electric EGR valve according to claim 5, characterized in that: The outer peripheral wall of the shaft segment (4201) includes arc segments (4202) and straight segments (4203) connected in sequence along its own circumference, and the straight segments (4203) extend along the axial direction of the shaft segment (4201).

7. The electric EGR valve according to claim 1, characterized in that: The brushless motor (42) includes a stator (424) located in the motor housing (421); the stator (424) is located on the outer peripheral side of the rotor (422) and is fixedly connected to the motor housing (421).

8. The electric EGR valve according to claim 7, characterized in that: The stator (424) is connected to the motor housing (421) by heat-fitting; or, the stator (424) is press-fitted to the motor housing (421) by interference fitting.

9. The electric EGR valve according to any one of claims 1 to 8, characterized in that: The invention also includes a cover (6) and an outer shell (7), wherein the cover (6) is formed with an accommodating chamber (60) for accommodating the brushless motor (42), and the outer shell (7) is at least partially located between the cover (6) and the valve body (1), and is enclosed with the cover (6) to form an accommodating chamber (01), wherein the accommodating chamber (01) and the accommodating chamber are arranged in sequence along the axial direction of the output shaft (420), and the magnetic ring (423), the Hall sensor and the transmission mechanism (41) are all located in the accommodating chamber (01).

10. The electric EGR valve according to claim 9, characterized in that: A connector (8) electrically connected to the brushless motor (42) is provided on the outside of the cover (6); the connector (8), the cover (6), the outer shell (7) and the valve body (1) are connected via a first connector (91); a position of the cover (6) away from the connector (8) is connected to the outer shell (7) and the valve body (1) via a second connector (92).

11. The electric EGR valve according to claim 10, characterized in that: The connector (8) is provided with a first through hole (81) for the first connecting member (91) to pass through, the cover (6) is provided with a first threaded hole (61) threadedly connected to the first connecting member (91) and a first through hole (62) for the second connecting member (92) to pass through, the housing (7) is provided with a second through hole (71) for the first connecting member (91) to pass through and a second through hole (72) for the second connecting member (92) to pass through, the valve body (1) is provided with a third through hole (12) for the first connecting member (91) to pass through and a second threaded hole (13) threadedly connected to the second connecting member (92), the first connecting member (91) is a bolt, and the bolt passes through the first through hole (81), the first threaded hole (61), the second through hole (71) and the third through hole (12) in sequence and is threadedly connected to the nut (93).

Images