Electric EGR valve

Abstract

The invention relates to an electric EGR valve which comprises a valve body, a valve cavity is formed in the valve body, and a valve port communicating with the valve cavity is formed in the valve body; a valve element located in the valve cavity is arranged at the first end of the valve rod, and a sliding groove is formed in the second end of the valve rod; the eccentric wheel is provided with a bearing located in the sliding groove. The driving mechanism comprises a transmission mechanism and a driver used for driving the transmission mechanism to rotate, an output shaft of the driver is in driving connection with the power input end of the transmission mechanism, the power output end of the transmission mechanism is connected with the eccentric wheel, and the valve element moves in the direction close to or away from the valve port in the axial direction of the valve rod so as to open and close the valve port; the adjusting part can be in contact with one of the transmission mechanism, the eccentric wheel and the bearing which are in a rotating state, and the adjusting part can be adjusted to be in contact with different positions, arranged in the circumferential direction, of the part so as to adjust the rotating angle of the bearing rotating around the power output end of the transmission mechanism. And due to the arrangement of the adjusting piece, the idle strokes in different electric EGR valves can be kept consistent.

Description

Technical Field

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

[0002] In the engine, exhaust gas recirculation is a technology that recirculates part of the burned exhaust gas to the intake passage and enters the engine cylinder together with fresh air for reburning. The exhaust gas recirculation valve (EGR valve) is the core product of the exhaust gas recirculation module, which mainly plays the role of regulating the exhaust gas flow.

[0003] The current EGR valve generally outputs rotational motion through a motor, and transmits the rotational motion to the eccentric wheel through a set of reduction transmission mechanism. The eccentric wheel converts the rotational motion into linear motion through the cooperation between the bearing and the slide groove on the valve stem, thereby driving the valve stem and the valve core to realize the opening and closing function of the valve port. Since there may be a motion gap (i.e., idle stroke) between the internal gears of the reduction transmission mechanism, and there will also be a certain motion gap (i.e., idle stroke) between the bearing and the slide groove, this will cause the position signal fed back to the ECU by the sensor to have a deviation value from the actual position of the valve core. At present, the idle stroke is usually absorbed through the self-learning calibration strategy.

[0004] However, due to the different manufacturing errors of components of different EGR valves, the idle stroke fluctuates too much, making self-learning difficult. Summary of the invention

[0005] Based on this, it is necessary to provide an electric EGR valve that ensures the consistency of idle stroke between different EGR valves.

[0006] The present application provides an electric EGR valve, comprising a valve body, a valve cavity is provided inside the valve body, and the valve body has a valve port communicated with the valve cavity; a valve stem, a valve core located in the valve cavity is provided at the first end of the valve stem, and a slide groove is provided at the second end of the valve stem; an eccentric wheel is provided with a mounting shaft arranged crosswise with the valve stem and a bearing sleeved on the mounting shaft, and the bearing is located in the slide groove; a driving mechanism, comprising a transmission mechanism and a driver for driving the transmission mechanism to rotate, the output shaft of the driver is drivingly connected to the power input end of the transmission mechanism, the power output end of the transmission mechanism is arranged side by side with the mounting shaft and connected to the eccentric wheel, so as to drive the eccentric wheel to rotate and then make the valve core move along the axial direction of the valve stem toward or away from the valve port to open and close the valve port; and also includes an adjusting member capable of contacting one of the transmission mechanism, the eccentric wheel and the bearing in a rotating state, and the adjusting member can be adjusted to contact different positions of the components arranged along the circumferential direction, so as to adjust the rotation angle of the bearing rotating around the power output end of the transmission mechanism.

[0007] In one embodiment, the adjusting member is located on the outer peripheral side of the eccentric wheel and is arranged to be relatively fixedly connected to the valve body after moving along a first direction toward or away from the eccentric wheel, and the first direction is a direction intersecting with the rotation axis of the eccentric wheel.

[0008] In one of the embodiments, a mounting cavity is defined on the valve body for at least accommodating the eccentric wheel, and the adjusting member is disposed on a side wall of the mounting cavity and arranged corresponding to the eccentric wheel.

[0009] In one embodiment, the adjusting member is a screw, and a threaded hole is formed on the side wall of the installation cavity for the tail end of the screw to pass through the installation cavity.

[0010] In one embodiment, the adjusting member is located on the outer peripheral side of the bearing and is arranged to be relatively fixedly connected to the peripheral wall of the slide groove after moving along a second direction toward or away from the bearing, and the second direction is a direction intersecting the axis of the bearing.

[0011] In one embodiment, the slide groove includes a first groove wall and a second groove wall relatively spaced apart along the axial direction of the valve stem and a third groove wall extending along the axial direction of the valve stem, the first groove wall and the second groove wall are connected by the third groove wall, the second groove wall is located between the first groove wall and the valve port, the adjusting member is installed on the third groove wall, and the second direction is the wall thickness direction of the third groove wall.

[0012] In one embodiment, the adjusting member is a screw, and the third slot wall of the slide slot is provided with a threaded hole for the tail end of the screw to pass through the slide slot.

[0013] In one embodiment, the driver is a brushless motor, which includes a motor housing, a rotor that drives the output shaft to rotate, a magnetic ring that rotates synchronously with the rotor, and at least a Hall sensor for sensing the position of the valve core. The rotor is disposed in the motor housing, the Hall sensor is electrically connected to the magnetic ring, the magnetic ring and the Hall sensor are both located outside the motor housing, and the magnetic ring is mounted on the output shaft and is consistent with the magnetic poles of the rotor.

[0014] In one embodiment, the electric EGR valve further includes a cover and an outer shell, the cover is formed with a accommodating cavity for accommodating the brushless motor, the outer shell is at least partially located between the cover and the valve body, and the outer shell and the cover together enclose a accommodating chamber, the accommodating chamber and the accommodating cavity are arranged in sequence along the axial direction of the output shaft, and the magnetic ring, transmission mechanism and Hall sensor are all located in the accommodating chamber.

[0015] In one embodiment, a connector electrically connected to the brushless motor is provided on the outer side of the cover, the connector, the cover, the outer shell and the valve body are connected by a first connecting member, and a position of the cover away from the connector is connected to the outer shell and the valve body by a second connecting member.

[0016] In one embodiment, the connector has a first through hole for the first connecting member to pass through, the cover has 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 has 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 has 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 a nut.

[0017] In one of the embodiments, the electric EGR valve further includes an elastic member that enables the valve core to always have a tendency to move toward the valve port, and the elastic member acts on the valve core.

[0018] In one embodiment, the valve port is located between the slide groove and at least a portion of the valve core, the slide groove includes a first groove wall and a second groove wall relatively spaced apart along the axial direction of the valve stem, the second groove wall is located between the first groove wall and the valve port, and when the valve port is in a closed state, a gap is left between the first groove wall and the bearing.

[0019] Compared with the prior art, in the electric EGR valve provided in the present application, an adjustable adjusting part is provided on the electric EGR valve, and the adjusting part is fixed after adjustment. After adjustment, the adjusting part can contact one of the transmission mechanism, eccentric wheel and bearing in a rotating state, and by continuously adjusting the adjusting part, the corresponding parts can be contacted at different positions, thereby realizing the adjustment of different rotation angles of the bearing, that is, the movement stroke of the bearing is limited by the adjusting part, thereby adjusting the idle stroke between the bearing and the inner circumferential wall of the slide groove. In this way, by providing an adjusting part on each electric EGR valve, the idle stroke in different electric EGR valves can be kept consistent, thereby avoiding the difficulty brought about by the self-learning calibration in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. 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.

[0021] Figure 1 This is a schematic diagram of the structure of an electric EGR valve according to an embodiment of the present application;

[0022] Figure 2 for Figure 1 A cross-sectional view of

[0023] Figure 3 for Figure 2 A partial enlarged view of point I in the middle;

[0024] Figure 4 for Figure 1 A cross-sectional view at the first connecting member;

[0025] Figure 5 for Figure 4 A partial enlarged view of position II in the middle;

[0026] Figure 6 for Figure 1 A cross-sectional view at the second connecting member;

[0027] Figure 7 for Figure 1 Schematic diagram of some structures;

[0028] Figure 8 for Figure 1 Schematic diagram of some structures;

[0029] Fig. 9 for Figure 8 A cross-sectional view of the assembly structure of the output shaft and the magnetic ring;

[0030] Fig.10 for Figure 7 Schematic diagram of some structures;

[0031] Fig.11 This is a schematic diagram of the matching structure of the adjusting member, the slider, the bearing, etc. in another embodiment of the present application.

[0032] Figure numerals: 1, valve body; 10, installation cavity; 11, valve cavity; 111, valve port; 12, third through hole; 13, second threaded hole; 14, chamber; 15, partition; 2, elastic member; 31, valve stem; 310, valve core; 311, slide groove; 3111, first groove wall; 3112, second groove wall; 3113, third groove wall; 312, slider; 32, eccentric wheel; 321, installation shaft; 33, bearing; 34, gap; 35, bushing; 36, sealing ring; 4, driving mechanism; 41, transmission mechanism; 411, driving gear; 412, driven gear; 413, Drive shaft; 42, brushless motor; 420, output shaft; 4201, shaft section; 4202, arc section; 4203, straight section; 421, motor housing; 422, rotor; 423, magnetic ring; 424, stator; 5, adjustment member; 6, cover; 60, accommodating chamber; 61, first threaded hole; 62, first through hole; 7, housing; 71, second through hole; 72, second through hole; 73, protrusion; 01, accommodating chamber; 8, connector; 81, first through hole; 91, first connecting member; 92, second connecting member; 93, nut; 01, accommodating chamber; 02, PCB board. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of 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 violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0034] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a centered 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 centered component at the same time. The terms "vertical", "horizontal", "upper", "lower", "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 the present application, but these terms are used here only 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, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0036] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may 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 intermediate medium. Moreover, a first feature being “above”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0037] 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.

[0038] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those 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 related listed items.

[0039] like Figures 1 to 11 As shown, the present application discloses an electric EGR valve. The electric EGR valve comprises a valve body 1, a valve core 310, a valve stem 31, an eccentric wheel 32, a driving mechanism 4 and an adjusting member 5. The valve body 1 has a valve cavity 11 disposed therein, and the valve body 1 has a valve port 111 communicating with the valve cavity 11.

[0040] like Figure 2 and Figure 3 As shown, the first end of the valve stem 31 is provided with a valve core 310 located in the valve cavity 11, and the second end of the valve stem 31 is provided with a slide groove 311. The eccentric wheel 32 is provided with a mounting shaft 321 arranged crosswise with the valve stem 31 and a bearing 33 sleeved on the mounting shaft 321, and the bearing 33 is located in the slide groove 311.

[0041] like Figure 2 and Figure 6As shown, the driving mechanism 4 includes a transmission mechanism 41 and a driver for driving the transmission mechanism 41 to rotate. The output shaft 420 of the driver is connected to the power input end of the transmission mechanism 41. The power output end of the transmission mechanism 41 is arranged side by side with the mounting shaft 321 and connected to the eccentric wheel 32 to drive the eccentric wheel 32 to rotate and then move the valve core 310 along the axial direction of the valve stem 31 toward or away from the valve port 111 to open and close the valve port 111. In other words, the valve port 111 is located on the movement path of the valve core 310. It can be understood that the above-mentioned driver transmits power to the eccentric wheel 32 through the transmission mechanism 41, and the axial movement of the valve stem 31 is realized through the cooperation between the bearing 33 of the eccentric wheel 32 and the slide groove 311, and then the valve core 310 opens and closes the valve port 111.

[0042] like Figure 7 , Fig.10 and Fig.11 As shown, the above-mentioned adjusting member 5 can contact one of the components among the transmission mechanism 41, the eccentric wheel 32 and the bearing 33 in a rotating state, and the adjusting member 5 can be adjusted to contact with different positions of the corresponding components arranged along the circumferential direction, so as to adjust the rotation angle of the bearing 33 around the power output end of the transmission mechanism 41.

[0043] It can be understood that an adjusting member 5 is provided on the electric EGR valve. By adjusting the adjusting member 5, the adjusted adjusting member 5 can contact one of the transmission mechanism 41, the eccentric wheel 32 and the bearing 33 in a rotating state. By continuously adjusting the adjusting member 5, the corresponding parts can be contacted at different positions, thereby realizing the adjustment of different rotation angles of the bearing 33, that is, the movement stroke of the bearing 33 is limited by the adjusting member 5, thereby adjusting the idle stroke (movement gap) between the bearing 33 and the inner peripheral wall of the slide groove 311. In this way, by providing the adjusting member 5 on each electric EGR valve, the idle stroke in different electric EGR valves can be kept consistent.

[0044] The installation position, specific structural form, etc. of the adjusting member 5 will be further described through the following specific embodiments. However, those skilled in the art will understand that the following embodiments are only used to illustrate the present invention and should not be regarded as limiting the scope of the present invention.

[0045] In one embodiment, if Figure 7 and Fig.10 As shown, the adjusting member 5 is located on the outer peripheral side of the eccentric wheel 32, and is arranged to be relatively fixedly connected to the valve body 1 after being moved along the first direction A toward or away from the eccentric wheel 32, and the first direction A is a direction intersecting the rotation axis of the eccentric wheel 32. Among them, the valve body 1 is defined to have a mounting cavity 10 at least for accommodating the eccentric wheel 32, and the adjusting member 5 is arranged on the side wall of the mounting cavity 10 and corresponding to the eccentric wheel 32. In another embodiment, the aforementioned mounting cavity 10 is not formed on the valve body 1.

[0046] The adjusting member 5 is a screw, and the side wall of the mounting cavity 10 is provided with a threaded hole for the tail end of the screw to penetrate into the mounting cavity 10. It can be understood that when the rotation angle of the eccentric wheel 32 needs to be adjusted, the depth of the screw inserted into the mounting cavity 10 is adjusted by rotating the screw, and the screw is constrained on the side wall of the mounting cavity 10. During the rotation of the eccentric wheel 32, the tail end of the screw can adjust the rotation angle of the eccentric wheel 32. Since the bearing 33 is installed on the eccentric wheel 32, the rotation angle of the bearing 33 is adjusted accordingly, thereby adjusting the idle travel between the bearing 33 and the inner peripheral wall of the slide groove 311.

[0047] In another embodiment, if Fig.11 As shown, the adjusting member 5 is located on the outer peripheral side of the bearing 33 and is arranged to be relatively fixedly connected to the peripheral wall of the slide groove 311 after moving along the second direction B toward or away from the bearing 33. The second direction B is a direction intersecting the axis of the bearing 33.

[0048] It can be understood that when the rotation angle of the bearing 33 needs to be adjusted, since the adjusting member 5 is located on the outer peripheral side of the bearing 33, the adjusting member 5 can be moved toward or away from the bearing 33, and the moving adjusting member 5 is constrained on the peripheral wall of the slide groove 311. At this time, the adjusted adjusting member 5 can adjust the rotation angle of the bearing 33, thereby adjusting the idle travel between the bearing 33 and the inner peripheral wall of the slide groove 311.

[0049] like Fig.11 As shown, the above-mentioned slide groove 311 includes a first groove wall 3111 and a second groove wall 3112 which are relatively spaced along the axial direction of the valve stem 31 and a third groove wall 3113 which extends along the axial direction of the valve stem 31. The first groove wall 3111 and the second groove wall 3112 are connected by the third groove wall 3113, and the second groove wall 3112 is located between the first groove wall 3111 and the valve port 111. The height of the above-mentioned second groove wall 3112 is less than the length of the first groove wall 3111, that is, the slide groove 311 is a flat groove. The above-mentioned adjustment member 5 is installed on the third groove wall 3113, and the second direction B is the wall thickness direction of the third groove wall 3113. The above-mentioned first direction A is the same as the second direction B. In another embodiment, the adjustment member 5 can also be installed at a position of the first groove wall 3111 close to the third groove wall 3113.

[0050] The adjusting member 5 is a screw, and the third groove wall 3113 of the slide groove 311 is provided with a threaded hole for the tail end of the screw to penetrate into the slide groove 311. It can be understood that when the rotation angle of the bearing 33 needs to be adjusted, the depth of the screw inserted into the slide groove 311 is adjusted by rotating the screw, and the screw is constrained on the side wall of the slide groove 311. During the rotation of the bearing 33, the tail end of the screw can adjust the rotation angle of the bearing 33, thereby adjusting the idle travel between the bearing 33 and the inner peripheral wall of the slide groove 311.

[0051] In addition, the adjusting member 5 can also be in the form of a bolt.

[0052] In another embodiment, if Figure 1 , Figure 2 , Figures 4 to 6 As shown, the electric EGR valve further includes a cover 6 and a shell 7. The cover 6 is formed with a receiving chamber 60 for receiving the brushless motor 42. The shell 7 is partially located between the cover 6 and the valve body 1, and the shell 7 and the cover 6 are enclosed together to form a receiving chamber 01, and the receiving chamber 01 and the receiving chamber 60 are arranged in sequence along the axial direction of the output shaft 420.

[0053] The above-mentioned adjusting member 5 is arranged on the outer shell 7, and the outer shell 7 is provided with an annular hole extending along the circumference of the driven gear. After the adjusting member 5 moves along the length direction of the annular hole, the adjusting member 5 is fixed and constrained on the outer shell 7, so as to adjust the rotation angle of the driven gear, and finally realize the adjustment of the rotation angle of the bearing to achieve the purpose of adjusting the idle stroke.

[0054] In the above embodiments, Figure 2 and Figure 3 As shown, the valve port 111 is located between the slide slot 311 and at least part of the valve core 310. The bearing 33 is in contact with the second slot wall 3112. When the valve port 111 is in a closed state, a gap 34 is left between the first slot wall 3111 and the bearing 33. It can be understood that, since the force borne by the bearing 33 and the mounting shaft 321 is the largest when the valve port 111 is in a closed state, the existence of the adjustment member 5 makes it possible for the bearing 33 to not contact the first slot wall 3111 when the valve port 111 is in a closed state, thereby avoiding wear on the bearing 33, reducing the possibility of fatigue fracture of the mounting shaft 321 supported by the mounting shaft 321, and extending the service life of the bearing 33 and the mounting shaft 321. In other words, by limiting the movement stroke (i.e., the rotation angle) of the bearing 33 through the adjustment member 5, the bearing 33 can withstand a larger torque and is not easily damaged.

[0055] like Figure 2 and Figure 6As shown, the driver is a brushless motor 42. The brushless motor 42 includes a motor housing 421, a rotor 422 driving an 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. The Hall sensor can sense the position of the valve core 310. The rotor 422 is arranged in the motor housing 421, and the magnetic ring 423 is located outside the motor housing 421 and installed on the output shaft 420, and is consistent with the magnetic pole of the rotor 422.

[0056] It can be understood that, since the magnetic ring 423 has the same magnetic pole as the rotor 422 of the brushless motor 42, and the magnetic ring 423 rotates synchronously with the rotor 422, then, 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, and the position information of the rotor 422 can be determined by the cooperation of the Hall sensor and the magnetic ring 423 arranged outside the motor housing 421, thereby determining the position of the valve core 310. The Hall sensor is arranged outside the motor housing 421 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 42 in the electric EGR valve, and can work in a high temperature environment above 130°C. Since the above-mentioned Hall sensor can sense the position of the valve core 310, it is convenient to adjust the rotation angle of the bearing 33 later. In one embodiment, the Hall sensor is located inside the motor housing 421. In another embodiment, the above-mentioned Hall sensor is located outside the motor housing 421. Specifically, the above-mentioned Hall sensor and the transmission mechanism 41 are both located in the accommodation chamber 01. In this way, the existence of the accommodation chamber 01 can protect the transmission mechanism 41 and the magnetic ring 423, etc.

[0057] In one embodiment, if Figure 2 , Figure 6 and Figure 8 As shown, the transmission mechanism 41 includes a driving gear 411 and a driven gear 412. The driving mechanism 4 also includes 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. The driven gear 412 is located above the driving gear 411. In another embodiment, the transmission mechanism 41 also includes a transmission gear, and the driving gear 411 meshes with the driven gear 412 through the transmission gear.

[0058] In order to constrain the magnetic ring 423, as Figure 8 and Fig. 9As shown, 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 socket that matches the outer peripheral wall of the shaft section 4201 for the shaft section 4201 to be inserted, 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 both rotate synchronously with the output shaft 420. In another embodiment, the magnetic ring 423 is fixedly connected to the rotor 422 and is coaxially arranged, so that the magnetic ring 423 and the rotor 422 both rotate synchronously with the output shaft 420.

[0059] In one embodiment, the cross section of the shaft section 4201 is elliptical. Fig. 9 As shown, 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. In another embodiment, there are two or more straight segments 4203, and the straight segments 4203 can be arranged adjacent to each other, or an arc segment 4202 can be arranged between two adjacent straight segments 4203.

[0060] In one embodiment, a slider 312 is disposed at the second end of the valve stem 31, and the slide groove 311 is located on the slider 312. In this embodiment, the valve stem 31 is arranged along the up-down direction, the first end is the lower end of the valve stem 31, and the second end is the upper end of the valve stem 31. Figure 2 As shown, the electric EGR valve further includes an elastic member 2 that allows the valve core 310 to always have a tendency to move toward the valve port 111, and the elastic member 2 acts on the valve core 310. In this embodiment, a cavity 14 located above the valve cavity 11 is formed in the valve body 1, and the cavity 14 and the valve cavity 11 are separated by a partition 15. The partition 15 is provided with a through hole for the lower end of the valve stem 31 to penetrate into the valve cavity 11. The elastic member 2 is located in the cavity 14 and is sleeved on the periphery of the valve stem 31. The upper end of the spring contacts the slider 312, and the lower end of the spring contacts the top surface of the partition 15.

[0061] In order to seal the perforation, the outer sleeve of the valve stem 31 is provided with a bushing 35 and a sealing ring 36 arranged in sequence along the axial direction of the valve stem 31, so as to realize a sealed connection between the valve stem 31 and the inner peripheral wall of the perforation. In one embodiment, the sealing ring 36 is located above the bushing 35. In another embodiment, the sealing ring 36 is located below the bushing 35.

[0062] like Figure 2 and Figure 6As shown, the brushless motor 42 further 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. In one embodiment, the stator 424 is connected to the motor housing 421 by heat fitting. In another embodiment, the stator 424 is press-fitted to the motor housing 421 by interference fitting.

[0063] It is understandable that the cost of injection molding the stator 424 in the prior art is saved, and the above fixing method can more efficiently transfer the heat of the brushless motor 42 to the outside of the motor housing 421, accelerate the heat dissipation of the brushless motor 42, so that the brushless motor 42 has higher efficiency, improves the output torque, and has better reliability. The above motor housing 421 is a metal housing, such as die-cast aluminum.

[0064] like Figure 1 , Figures 4 to 7 As shown, a connector 8 electrically connected to the brushless motor 42 is disposed on the outer side of the housing 6, the connector 8, the housing 6, the outer shell 7 and the valve body 1 are connected via a first connector 91, and the housing 6 is connected to the outer shell 7 and the valve body 1 via a second connector 92 at a position away from the connector 8. It can be understood that the connection between the connector 8, the housing 6, the outer shell 7 and the valve body 1 is achieved via the first connector 91, and the connection between the housing 6, the outer shell 7 and the valve body 1 is achieved via the second connector 92.

[0065] like Figure 2 , Figure 3 , Figure 7 and Fig.10 As shown, a part of the housing 7 protrudes toward the valve body 1 to form a protrusion 73, and a wall plate of the valve body 1 is provided with a socket for inserting the protrusion 73, and the socket is located on the wall plate of the installation cavity 10, and one end of the transmission shaft 413 is installed on the protrusion 73. It can be understood that the existence of the protrusion 73 further improves the reliability of the installation of the cover 6 and the valve body 1.

[0066] In one embodiment, threaded holes that are threadedly matched with the first connecting member 91 are correspondingly provided on the connector 8, the cover 6, the housing 7 and the valve body 1. Figures 4 to 6 As shown, 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.

[0067] It can be understood that the connection between the plug 8, the cover 6, the outer shell 7 and the valve body 1 is realized in sequence by a bolt, thereby improving the reliability of the connection between the four, and the connection between the cover 6, the outer shell 7 and the valve body 1 is realized in sequence by a second connecting member 92, thereby improving the reliability of the connection between the three. The arrangement of the first connecting member 91 and the second connecting member avoids the problem of insufficient anti-vibration capability caused by the connection between the two by using a connecting member, thereby improving the anti-vibration capability of the electric EGR valve.

[0068] In addition, if Figure 2 As shown, a PCB board 02 is arranged in the above-mentioned accommodation chamber 01, which is connected to the cover shell 6 through a connecting plug 8, so as to facilitate the positioning of the connecting plug 8 and the soldering between the connecting plug 8 and the PCB board 02.

[0069] In addition, there are two first connecting members 91, which are arranged side by side and are located above the second connecting member 92. There are multiple second connecting members 92, which are arranged along the circumference of the brushless motor 42, further improving the reliability of the connection between the cover 6, the housing 7 and the valve body 1.

[0070] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, 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, they should be considered to be within the scope of this specification.

[0071] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. An electric EGR valve, comprising: A valve body (1) having a valve cavity (11) therein, and the valve body (1) has a valve port (111) communicated with the valve cavity (11); A valve stem (31), wherein a valve core (310) located in the valve cavity (11) is disposed at a first end of the valve stem (31), and a sliding groove (311) is disposed at a second end of the valve stem (31); The eccentric wheel (32) is provided with a mounting shaft (321) arranged to cross the valve stem (31) and a bearing (33) sleeved on the mounting shaft (321), wherein the bearing (33) is located in the slide groove (311); A driving mechanism (4), comprising a transmission mechanism (41) and a driver for driving the transmission mechanism (41) to rotate, wherein an output shaft (420) of the driver is drivingly connected to a power input end of the transmission mechanism (41), and the power output end of the transmission mechanism (41) is arranged side by side with the mounting shaft (321) and is connected to the eccentric wheel (32) to drive the eccentric wheel (32) to rotate, thereby causing the valve core (310) to move along the axial direction of the valve stem (31) toward or away from the valve port (111) to open and close the valve port (111); The invention is characterized in that it also includes an adjusting member (5) capable of contacting one of the components among the transmission mechanism (41), the eccentric wheel (32) and the bearing (33) in a rotating state, and the adjusting member (5) can be adjusted to contact the components at different positions arranged along the circumferential direction, so as to adjust the rotation angle of the bearing (33) around the power output end of the transmission mechanism (41).

2. The electric EGR valve according to claim 1, characterized in that: The adjusting member (5) is located on the outer peripheral side of the eccentric wheel (32) and is arranged to be relatively fixedly connected to the valve body (1) after being moved along a first direction toward or away from the eccentric wheel (32), wherein the first direction is a direction intersecting with the rotation axis of the eccentric wheel (32).

3. The electric EGR valve according to claim 2, characterized in that: The valve body (1) is defined to have a mounting cavity (10) at least for accommodating the eccentric wheel (32); the adjusting member (5) is disposed on a side wall of the mounting cavity (10) and is arranged corresponding to the eccentric wheel (32).

4. The electric EGR valve according to claim 3, characterized in that: The adjusting member (5) is a screw, and the side wall of the installation cavity (10) is provided with a threaded hole for the tail end of the screw to penetrate into the installation cavity (10).

5. The electric EGR valve according to claim 1, characterized in that: The adjusting member (5) is located on the outer peripheral side of the bearing (33) and is arranged to be relatively fixedly connected to the peripheral wall of the slide groove (311) after being moved along a second direction toward or away from the bearing (33), wherein the second direction is a direction intersecting the axis of the bearing (33).

6. The electric EGR valve according to claim 5, characterized in that: The slide groove (311) includes a first groove wall (3111) and a second groove wall (3112) which are relatively spaced apart along the axial direction of the valve stem (31) and a third groove wall (3113) extending along the axial direction of the valve stem (31), the first groove wall (3111) and the second groove wall (3112) are connected via the third groove wall (3113), the second groove wall (3112) is located between the first groove wall (3111) and the valve port (111), the adjusting member (5) is mounted on the third groove wall (3113), and the second direction is the wall thickness direction of the third groove wall (3113).

7. The electric EGR valve according to claim 6, characterized in that: The adjusting member (5) is a screw, and the third groove wall (3113) of the sliding groove (311) is provided with a threaded hole for the tail end of the screw to pass through the sliding groove (311).

8. The electric EGR valve according to claim 1, characterized in that: The driver is a brushless motor (42), which 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 for at least sensing the position of the valve core (310), wherein the rotor (422) is arranged in the motor housing (421), the Hall sensor is electrically connected to the magnetic ring (423), 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 consistent with the magnetic pole of the rotor (422).

9. The electric EGR valve according to claim 8, characterized in that: The invention also comprises a cover shell (6) and an outer shell (7), wherein a receiving chamber (60) for receiving the brushless motor (42) is formed on the cover shell (6), and the outer shell (7) is at least partially located between the cover shell (6) and the valve body (1), and the outer shell (7) and the cover shell (6) are jointly enclosed to form a receiving chamber (01), and the receiving chamber (01) and the receiving chamber (60) are arranged in sequence along the axial direction of the output shaft (420), and the magnetic ring (423), the transmission mechanism (41) and the Hall sensor are all located in the receiving 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 outer side of the cover (6); the connector (8), the cover (6), the outer shell (7) and the valve body (1) are connected via a first connecting piece (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 connecting piece (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 a nut (93).

12. The electric EGR valve according to claim 1, characterized in that: It also comprises an elastic member (2) which enables the valve core (310) to always have a tendency to move towards the valve port (111), and the elastic member (2) acts on the valve core (310).

13. The electric EGR valve according to any one of claims 1 to 12, characterized in that: The valve port (111) is located between the slide groove (311) and at least a portion of the valve core (310); the slide groove (311) comprises a first groove wall (3111) and a second groove wall (3112) which are relatively spaced apart along the axial direction of the valve stem (31); the second groove wall (3112) is located between the first groove wall (3111) and the valve port (111); when the valve port (111) is in a closed state, a gap (34) is left between the first groove wall (3111) and the bearing (33).

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