Motor and exhaust gas circulation actuator

Abstract

The utility model relates to the technical field of waste gas circulation, and discloses a motor and a waste gas circulation executor, the waste gas circulation executor comprises a valve plate, the motor comprises a stator assembly; the rotor assembly is arranged in the stator assembly, the rotor assembly comprises a rotating shaft and an iron core arranged outside the rotating shaft in a sleeving mode, the rotating shaft and the iron core can jointly rotate around the axis of the rotating shaft relative to the stator assembly, a first thread is arranged at the end of the rotating shaft, and a second thread is arranged at the end of the iron core. The axis of the first thread and the axis of the rotating shaft are coaxially arranged; the connecting piece is provided with a second thread, the second thread is connected with the first thread in a matched mode, and the connecting piece is used for being connected with the valve plate; and the position detection piece is used for acquiring the position information of the connecting piece in the axis direction of the rotating shaft. According to the motor and the exhaust gas circulation actuator, the problems that an existing exhaust gas circulation actuator is complex in structure and high in manufacturing cost can be solved.

Description

Technical Field

[0001] This application relates to the field of waste gas recirculation technology, and in particular to an electric motor and a waste gas recirculation actuator. Background Technology

[0002] In recent years, the country has vigorously developed new energy vehicles, and the sales of new energy vehicles have been increasing. However, the combined sales of hybrid and fuel vehicles still account for a high percentage. For traditional car engines, the exhaust gas recirculation (EGR) actuator is also an important component.

[0003] In related technologies, exhaust gas recirculation actuators generally include a motor and a valve plate. The motor has relatively low torque, and the motor shaft rotates. During use, a multi-stage gear transmission system is needed to convert the rotational motion of the motor shaft into linear motion to control the valve plate of the exhaust gas recirculation actuator, thereby adjusting the opening and closing of the air inlet. Its structure is complex and its manufacturing cost is high. Utility Model Content

[0004] This application provides a motor and an exhaust gas recirculation actuator, which can improve the problems of complex structure and high manufacturing cost of existing exhaust gas recirculation actuators.

[0005] In a first aspect, embodiments of this application provide a motor for an exhaust gas recirculation actuator, the exhaust gas recirculation actuator including a valve plate, and the motor including:

[0006] Stator assembly;

[0007] A rotor assembly is disposed inside the stator assembly. The rotor assembly includes a rotating shaft and an iron core sleeved outside the rotating shaft. The rotating shaft and the iron core are capable of rotating together relative to the stator assembly around the axis of the rotating shaft. The rotating shaft is provided with a first thread, and the axis of the first thread is coaxial with the axis of the rotating shaft.

[0008] A connector, wherein the connector is provided with a second thread, the second thread engaging with the first thread, the connector being used to connect with the valve plate; and

[0009] A position detection component is used to detect the position of the connector in the axial direction of the rotating shaft.

[0010] In some embodiments, the shaft has a connecting hole inside, the first thread is an internal thread formed on the inner wall of the connecting hole, and the second thread is an external thread that mates with the internal thread.

[0011] In some embodiments, the rotating shaft has a mounting hole inside, which is coaxial with the connecting hole and located on the side of the connecting hole away from the connector. The mounting hole is connected to the connecting hole, and the position detection element is located inside the mounting hole.

[0012] In some embodiments, the diameter of the mounting hole is larger than the diameter of the connecting hole.

[0013] In some embodiments, the end of the mounting hole opposite to the connecting hole is connected to the external space of the rotating shaft.

[0014] In some embodiments, the stator assembly includes two permanent magnets, the outer surface of the iron core is provided with a plurality of inclined slots, and the motor includes a commutator comprising a plurality of commutator segments; wherein...

[0015] The number of inclined slots is 9, and the number of commutator segments is 9 or 18;

[0016] Alternatively, the number of inclined slots is 11, and the number of commutator segments is 11 or 22.

[0017] In some embodiments, the direction of extension of the inclined groove forms an angle with the axial direction of the rotating shaft.

[0018] In some embodiments, the position detection device includes one of a Hall sensor, a laser sensor, an inductive sensor, and a capacitive sensor.

[0019] Secondly, embodiments of this application provide an exhaust gas recirculation actuator, which includes a valve plate and a motor as described in the first aspect, wherein the connecting member is connected to the valve plate.

[0020] In some embodiments, the exhaust gas recirculation actuator further includes a housing, the motor is located inside the housing, the housing is provided with an air inlet, and the valve plate is adapted to the air inlet.

[0021] The motor provided in this application embodiment has the following advantages: Since the rotating shaft is provided with a first thread, the axis of the first thread is coaxial with the axis of the rotating shaft, and the connecting member is provided with a second thread, the second thread is engaged with the first thread for connection. The connecting member is used to connect with the valve plate, and the position detection device is used to detect the position of the connecting member in the axial direction of the rotating shaft. Therefore, the rotational motion of the rotating shaft can be converted into linear motion of the connecting member along the axial direction of the rotating shaft by the engagement of the second thread and the first thread. This causes the connecting member to drive the valve plate to move, thereby opening and closing the air inlet. At the same time, the position detection device can detect the position of the connecting member in the axial direction of the rotating shaft to ensure that the connecting member drives the valve plate to the accurate position so that the air inlet can open a certain space and can be completely closed, ensuring the normal use of the exhaust gas recirculation actuator.

[0022] The advantages of the exhaust gas recirculation actuator provided in this application compared to the prior art can be seen in the description of the advantages of the motor provided in this application compared to the prior art, which will not be repeated here. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the motor structure of the exhaust gas recirculation actuator in one embodiment of this application;

[0025] Figure 2 yes Figure 1 The diagram shows the structure of the rotor assembly and commutator in the motor.

[0026] Figure 3 yes Figure 2 The diagram shows the internal structure of the rotor assembly and commutator.

[0027] Figure 4 yes Figure 1 The diagram shows a cross-sectional view of the motor.

[0028] Figure 5 yes Figure 1 The diagram shows a cross-sectional view of the commutator of the motor.

[0029] Figure 6 yes Figure 1 Another cross-sectional view of the motor shown;

[0030] Figure 7 yes Figure 1The diagram shows a partial structural representation of the connection between the motor and the valve plate.

[0031] Figure 8 A cross-sectional view of the commutator of the motor in another embodiment of this application.

[0032] The markings in the diagram mean:

[0033] 10. Stator assembly;

[0034] 11. Permanent magnet;

[0035] 20. Rotor assembly;

[0036] 21. Iron core; 211. Inclined groove; 22. Shaft; 221. First thread; 222. Connecting hole; 223. Mounting hole; 23. Enamelled wire; 24. Rolling bearing; 25. Magnetic slingshot; 26. Boss;

[0037] 30. Connectors;

[0038] 31. Second thread;

[0039] 40. Position detection components;

[0040] 50. Commutator;

[0041] 60. End cap;

[0042] 70. Valve plate;

[0043] 80. Outer shell;

[0044] 81. Air inlet; 82. Receptacle. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0046] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0047] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0048] In this specification, references to "one embodiment," "some embodiments," or simply "embodiment" mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. Furthermore, in one or more embodiments, specific features, structures, or characteristics may be combined in any suitable manner.

[0049] To illustrate the technical solution of this application, the following description is provided in conjunction with specific accompanying drawings and embodiments.

[0050] In recent years, the country has vigorously developed new energy vehicles, and the sales of new energy vehicles have been increasing. However, the combined sales of hybrid and fuel vehicles still account for a high percentage. For traditional car engines, exhaust gas recirculation actuators are also an important component.

[0051] In related technologies, exhaust gas recirculation actuators generally include a motor and a valve plate. The motor has relatively low torque, and the motor shaft rotates. During use, a multi-stage gear transmission system is needed to convert the rotational motion of the motor shaft into linear motion to control the valve plate of the exhaust gas recirculation actuator, thereby adjusting the opening and closing of the air inlet. Its structure is complex and its manufacturing cost is high.

[0052] In view of this, this application provides a motor and an exhaust gas recirculation actuator. Since the rotating shaft is provided with a first thread, the axis of which is coaxial with the axis of the rotating shaft. The connecting member is provided with a second thread, which engages with the first thread. The connecting member is used to connect with a valve plate, and a position detection device is used to detect the position of the connecting member along the axis of the rotating shaft. Therefore, by engaging the second thread with the first thread, the rotational motion of the rotating shaft can be converted into linear motion of the connecting member along the axis of the rotating shaft. This causes the connecting member to drive the valve plate to move, opening and closing the air inlet. Simultaneously, the position detection device can detect the position of the connecting member along the axis of the rotating shaft, ensuring that the connecting member drives the valve plate to the accurate position, allowing the air inlet to open a certain space and to completely close, thus ensuring the normal operation of the exhaust gas recirculation actuator.

[0053] Please refer to Figures 1 to 3 , Figure 1 This is a schematic diagram of the motor structure of the exhaust gas recirculation actuator in one embodiment of this application. Figure 2 yes Figure 1 The diagram shows the structure of the rotor assembly 20 and commutator 50 in the motor. Figure 3 yes Figure 2 The diagram shows the internal structure of the rotor assembly 20 and the commutator 50.

[0054] In a first aspect, embodiments of this application provide a motor for an exhaust gas recirculation actuator. The exhaust gas recirculation actuator includes a valve plate 70, and the motor includes a stator assembly 10, a rotor assembly 20, a connector 30, and a position detection component 40.

[0055] The rotor assembly 20 is located inside the stator assembly 10. The rotor assembly 20 includes a rotating shaft 22 and an iron core 21 sleeved outside the rotating shaft 22. The rotating shaft 22 and the iron core 21 can rotate together relative to the stator assembly 10 around the axis of the rotating shaft 22. The rotating shaft 22 is provided with a first thread 221, and the axis of the first thread 221 is coaxial with the axis of the rotating shaft 22.

[0056] The axis of the rotating shaft 22 is parallel to Figure 1 The direction indicated by the middle arrow a. The direction indicated by arrow a is opposite to the direction indicated by arrow b.

[0057] Please refer to this as well. Figure 7 , Figure 7 yes Figure 1 The diagram shows a partial structural schematic of the motor and valve plate 70.

[0058] The connector 30 is provided with a second thread 31, which is connected to the first thread 221. The connector 30 is used to connect with the valve plate 70.

[0059] The first thread 221 is an internal thread, and the second thread 31 is an external thread. Alternatively, the first thread 221 is an external thread, and the second thread 31 is an internal thread.

[0060] The position detection component 40 is used to detect the position of the connector 30 in the axial direction of the rotating shaft 22.

[0061] The position detection component 40 may include a position sensor, etc.

[0062] When the motor provided in this embodiment is in use, the rotating shaft 22 and the iron core 21 rotate clockwise relative to the stator assembly 10 around the axis of the rotating shaft 22, and the connecting piece 30 and the valve plate 70 move clockwise together. Figure 1As the middle arrow a points in the direction of movement, valve plate 70 blocks air inlet 81, thus closing air inlet 81. When shaft 22 and core 21 rotate counterclockwise relative to stator assembly 10 about axis of shaft 22, connector 30 and valve plate 70 move together along... Figure 1 The valve plate 70 moves in the direction indicated by the middle arrow b, and the valve plate 70 no longer blocks the air inlet 81, so that the air inlet 81 is opened.

[0063] Since the position detection component 40 is used to detect the position of the connector 30 in the axial direction of the rotating shaft 22, the angle at which the rotating shaft 22 and the iron core 21 rotate together relative to the stator assembly 10 around the axis of the rotating shaft 22 can be adjusted according to the position information of the connector 30 in the axial direction of the rotating shaft 22 detected by the position detection component 40. This allows the valve plate 70 to completely cover the air inlet 81, thereby making the air inlet 81 completely closed. Alternatively, the valve plate 70 can also be made to no longer cover the air inlet 81, allowing the air inlet 81 to open a certain space.

[0064] As can be seen from the above, the motor provided in this embodiment has a first thread 221 on the rotating shaft 22, with the axis of the first thread 221 coaxial with the axis of the rotating shaft 22. The connecting member 30 has a second thread 31, which is connected to the first thread 221. The connecting member 30 is used to connect with the valve plate 70, and the position detection member 40 is used to detect the position of the connecting member 30 in the axial direction of the rotating shaft 22. Therefore, the rotational motion of the rotating shaft 22 can be converted into linear motion of the connecting member 30 along the axial direction of the rotating shaft 22 by the cooperation of the second thread 31 and the first thread 221. This causes the connecting member 30 to drive the valve plate 70 to move, thereby opening and closing the air inlet 81. At the same time, the position detection member 40 can detect the position of the connecting member 30 in the axial direction of the rotating shaft 22, ensuring that the connecting member 30 drives the valve plate 70 to the accurate position so that the air inlet 81 can open a certain space and can be completely closed, ensuring the normal use of the exhaust gas recirculation actuator.

[0065] In this embodiment, the shaft 22 has a connecting hole 222 inside, the first thread 221 is an internal thread formed on the inner wall of the connecting hole 222, and the second thread 31 is an external thread that mates with the internal thread.

[0066] By adopting the above solution, the first thread 221 can be directly machined on the rotating shaft 22 without the need for other components, thus making the structure of the motor more compact.

[0067] For example, connector 30 may be configured as a lead screw, etc.

[0068] The rotating shaft 22 has a mounting hole 223 inside. The mounting hole 223 is coaxial with the connecting hole 222, and the mounting hole 223 is located on the side of the connecting hole 222 away from the connector 30. The mounting hole 223 is connected to the connecting hole 222, and the position detection component 40 is located inside the mounting hole 223.

[0069] This arrangement allows the position detection element 40 to be placed inside the rotating shaft 22, thereby preventing the position detection element 40 from occupying the external space of the rotating shaft 22, facilitating its placement, and protecting the position detection element 40.

[0070] In this embodiment, the diameter of the mounting hole 223 is larger than the diameter of the connecting hole 222.

[0071] This design facilitates the placement of the position detection component 40 within the mounting hole 223 and ensures that the shaft 22 corresponding to the connection hole 222 has high strength.

[0072] The end of the mounting hole 223 opposite to the connecting hole 222 is connected to the external space of the rotating shaft 22.

[0073] With this setup, the position detection element 40 can be placed inside the mounting hole 223 from the end opposite to the connection hole 222, making the operation simple and convenient.

[0074] Please refer to this as well. Figure 4 , Figure 5 and Figure 6 , Figure 4 yes Figure 1 The diagram shows a cross-sectional view of the motor. Figure 5 yes Figure 1 The diagram shows a cross-sectional view of the commutator 50 of the motor. Figure 6 yes Figure 1 Another cross-sectional view of the motor is shown.

[0075] In this embodiment, the stator assembly 10 includes two permanent magnets 11, the outer surface of the iron core 21 is provided with a plurality of inclined slots 211, the motor includes a commutator 50, and the commutator 50 includes a plurality of commutator segments; wherein, the number of inclined slots 211 is 9, and the number of commutator segments is 9 (9 bar).

[0076] By adopting the above solution, the motor torque ripple can be reduced, the load current variation can be minimized, the motor sparking can be minimized, and the EMC (Electromagnetic Compatibility) can be improved, which can meet the high standard requirements of future L3 and L4 autonomous and unmanned driving.

[0077] It is understood that the iron core 21 may include multiple silicon steel sheets, and the silicon steel sheets are provided with grooves corresponding to the inclined groove 211. The silicon steel sheets are fitted onto the rotating shaft 22 by interference fit, and the commutator 50 is fixed onto the rotating shaft 22 by glue and interference fit.

[0078] Please refer to Figure 8 , Figure 8 A cross-sectional view of the commutator 50 of the motor in another embodiment of this application.

[0079] In another embodiment that can achieve the above effect, the number of skew slots 211 is 9 and the number of commutator segments is 18 (18 bar).

[0080] In other embodiments that can achieve the above effects, the number of skew slots 211 is 11, and the number of commutator segments is 11 (11 bar) or 22 (22 bar).

[0081] The extension direction of the inclined groove 211 forms an angle with the axial direction of the rotating shaft 22.

[0082] This configuration can significantly reduce the cogging torque, which is beneficial for fine-tuning the valve plate 70 of the exhaust gas recirculation actuator.

[0083] The position detection component 40 includes one of a Hall sensor, a laser sensor, an inductive sensor, and a capacitive sensor.

[0084] This design allows for a simpler structure for the position detection component 40.

[0085] It should be noted that the stator assembly 10 provided in this embodiment may further include a motor housing, and the rotor assembly 20 may further include enameled wire 23, rolling bearing 24, and magnetic slingshot 25, etc. Two permanent magnets 11 are fixed between the boss 26 and the magnetic slingshot 25 of the motor housing with glue. In order to obtain high torque, the motor housing is larger than the motor housing of a traditional exhaust gas recirculation actuator, and the permanent magnets 11 have higher performance and are thicker.

[0086] The motor provided in this application embodiment may also include an end cover 60, carbon brushes, a plug, a support for motor operation, and a power connection, which will not be described in detail here.

[0087] The motor provided in this embodiment can be an odd-slot, 2-torque permanent magnet DC brushed motor. It has a simple structure, low material cost, and is easy to manufacture. By increasing the motor torque and reducing the actuator reduction mechanism, the rotational motion of the motor shaft 22 is directly converted into linear motion, which directly controls the opening and closing of the valve plate 70 of the exhaust gas recirculation actuator. This reduces the overall cost of the exhaust gas recirculation actuator, simplifies the structure, and makes its operation more reliable.

[0088] Please refer to Figures 1 to 8Secondly, embodiments of this application provide an exhaust gas recirculation actuator, which includes a valve plate 70 and a motor as described in the first aspect, with a connector 30 connected to the valve plate 70.

[0089] The exhaust gas recirculation actuator provided in this application embodiment has a first thread 221 on the rotating shaft 22, with the axis of the first thread 221 coaxial with the axis of the rotating shaft 22. The connecting member 30 has a second thread 31, which is connected to the first thread 221. The connecting member 30 is used to connect with the valve plate 70, and the position detection member 40 is used to detect the position of the connecting member 30 in the axial direction of the rotating shaft 22. Therefore, the rotational motion of the rotating shaft 22 can be converted into linear motion of the connecting member 30 along the axial direction of the rotating shaft 22 by the cooperation of the second thread 31 and the first thread 221. This causes the connecting member 30 to drive the valve plate 70 to move, thereby opening and closing the air inlet 81. At the same time, the position detection member 40 can detect the position of the connecting member 30 in the axial direction of the rotating shaft 22, ensuring that the connecting member 30 drives the valve plate 70 to the accurate position so that the air inlet 81 can open a certain space and can be completely closed, thus ensuring the normal use of the exhaust gas recirculation actuator.

[0090] The exhaust gas recirculation actuator also includes a housing 80, a motor located inside the housing 80, an air inlet 81 provided in the housing 80, and a valve plate 70 adapted to the air inlet 81.

[0091] With this configuration, the valve plate 70 can be moved by a motor to open and close the air inlet 81.

[0092] It should be noted that the valve plate 70 can be welded to the end of the connector 30 away from the rotating shaft 22.

[0093] Figure 7 The embodiment shown depicts a state where the valve plate 70 blocks the air inlet 81, thus closing the air inlet 81. When the connector 30 and the valve plate 70 move together along... Figure 7 When the middle arrow b is moved in the direction indicated, the valve plate 70 moves downward, and the valve plate 70 no longer blocks the air inlet 81, thus opening the air inlet 81.

[0094] By adopting the above scheme, the connection structure between the valve plate 70 and the outer shell 80 can be made relatively simple.

[0095] The outer casing 80 is provided with a receiving groove 82, the air inlet 81 is located at the bottom of the receiving groove 82, and the valve plate 70 is located inside the receiving groove 82.

[0096] With this configuration, the valve plate 70 can be accommodated by the receiving groove 82, thus preventing the valve plate 70 from interfering with external parts during its movement.

[0097] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. An electric motor, characterized in that, For an exhaust gas recirculation actuator, the exhaust gas recirculation actuator includes a valve plate, and the motor includes: Stator assembly; A rotor assembly is disposed inside the stator assembly. The rotor assembly includes a rotating shaft and an iron core sleeved outside the rotating shaft. The rotating shaft and the iron core are capable of rotating together relative to the stator assembly around the axis of the rotating shaft. The rotating shaft is provided with a first thread, and the axis of the first thread is coaxial with the axis of the rotating shaft. A connector, wherein the connector is provided with a second thread, the second thread engaging with the first thread, the connector being used to connect with the valve plate; and A position detection component is used to detect the position of the connector in the axial direction of the rotating shaft.

2. The motor according to claim 1, characterized in that, The shaft has a connecting hole inside, the first thread is an internal thread formed on the inner wall of the connecting hole, and the second thread is an external thread that mates with the internal thread.

3. The motor according to claim 2, characterized in that, The rotating shaft has an internal mounting hole, which is coaxial with the connecting hole. The mounting hole is located on the side of the connecting hole away from the connector, and the mounting hole is connected to the connecting hole. The position detection component is located inside the mounting hole.

4. The motor according to claim 3, characterized in that, The diameter of the mounting hole is larger than the diameter of the connecting hole.

5. The motor according to claim 3, characterized in that, The end of the mounting hole opposite to the connecting hole is connected to the external space of the rotating shaft.

6. The motor according to any one of claims 1 to 5, characterized in that, The stator assembly includes two permanent magnets, the outer surface of the iron core is provided with multiple inclined slots, the motor includes a commutator, and the commutator includes multiple commutator segments; wherein... The number of inclined slots is 9, and the number of commutator segments is 9 or 18; Alternatively, the number of inclined slots is 11, and the number of commutator segments is 11 or 22.

7. The motor according to claim 6, characterized in that, The extension direction of the inclined groove forms an angle with the axial direction of the rotating shaft.

8. The motor according to any one of claims 1 to 5, characterized in that, The position detection device includes one of the following: a Hall sensor, a laser sensor, an inductive sensor, and a capacitive sensor.

9. A waste gas recirculation actuator, characterized in that, The exhaust gas recirculation actuator includes a valve plate and a motor as described in any one of claims 1 to 8, wherein the connecting member is connected to the valve plate.

10. The exhaust gas recirculation actuator according to claim 9, characterized in that, The exhaust gas recirculation actuator also includes a housing, the motor is located inside the housing, the housing is provided with an air inlet, and the valve plate is adapted to the air inlet.

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