An electric actuator for a control valve of an automobile exhaust system

Abstract

The present invention discloses an electric actuator for a control valve of an automobile exhaust system, comprising a housing with a storage space inside, a motor arranged in the storage space, and a gear set arranged in the storage space and connected to the motor; the housing also includes a PCB board for controlling the automatic opening and closing rotation of the motor, a drive shaft connected to the gear set, and a torsion spring for driving the gear set to rotate and reset; the drive shaft is arranged at the output end of the gear set, and the torsion spring is sleeved on the rotating shaft of the gear set outside the drive shaft. The present invention arranges a torsion spring connected to the gear set, and makes the valve body of the actuator in the initial state in an open state, so that when the actuator is accidentally powered off or damaged, the gear set and the drive shaft can be reset by the rebound of the torsion spring itself, ensuring that the valve cover of the valve body can be driven to rotate to the initial position when the electric actuator is accidentally powered off or damaged, thereby ensuring that the automobile valve body is in an open and closed state, and ensuring the normal use of the automobile exhaust system.

Description

Technical Field

[0001] The invention relates to the technical field of actuators, and in particular to an electric actuator for a control valve of an automobile exhaust system. Background Art

[0002] The actuator is a commonly used control device in automotive accessories. It is a controller used to control the opening and closing state of the valve body in the exhaust system of the automobile engine. By connecting with the automobile exhaust valve body, the valve body flow can be controlled and adjusted to ensure the coolant flow of the automobile battery pack cooling system and the gas flow of the automobile engine.

[0003] When the existing electric actuator is connected to the valve body, the exhaust pipe passing through the valve body is in a closed state. Therefore, the opening and closing of the valve body and the flow rate regulation can be realized only by controlling the opening and closing degree of the valve body through the controller. However, when the actuator is accidentally powered off or damaged during use, the internal gear set will be stuck in this state, and the control valve connected to the actuator will not be able to regulate the flow rate, and it is impossible to ensure that the valve body has sufficient exhaust flow for gas discharge when the automobile engine exhaust system continues to work, which may easily cause the gas to be unable to be fully discharged, affecting the normal use of the automobile exhaust system.

[0004] An electric actuator for a control valve of an automobile exhaust system is now provided. By arranging a torsion spring connected to a gear set and making the valve body of the actuator in an open state in the initial state, when the actuator is accidentally powered off or damaged, the gear set and the drive shaft can be reset by the rebound of the torsion spring itself, ensuring that the valve body and valve cover of the automobile exhaust system are returned to the open state, ensuring that the automobile exhaust system has sufficient exhaust flow and can be used normally. Summary of the invention

[0005] The object of the present invention is to provide an electric actuator for an automobile exhaust system control valve to solve the problems mentioned in the above background technology.

[0006] In order to achieve the above-mentioned purpose, the solution of the present invention is: an electric actuator for an automobile exhaust system control valve, comprising a shell with a storage space inside, a motor arranged in the storage space, and a gear set arranged in the storage space and connected to the motor; the shell also includes a PCB board for controlling the automatic opening and closing rotation of the motor, a drive shaft connected to the gear set, and a torsion spring for driving the gear set to rotate and reset; the drive shaft is arranged at the output end of the gear set, the PCB board is arranged above the gear set, and the torsion spring is sleeved on the rotating shaft of the gear set outside the drive shaft.

[0007] Furthermore, the shell includes a cover body and a casing; the cover body and the casing are tightly attached to form a storage space inside the casing; and the connection between the cover body and the casing is sealed by laser welding.

[0008] Furthermore, the storage space is provided with a positioning portion for limiting the displacement of the motor and the gear set.

[0009] Furthermore, a protruding wiring portion is provided on the outer surface of the housing; the wiring portion is configured as a hollow structure, and a conductive through hole is provided between the hollow cavity of the wiring portion and the storage space.

[0010] Furthermore, the housing is provided with an air vent, and a breathing membrane is provided in the air vent to balance the air pressure value inside and outside the actuator.

[0011] Furthermore, a fixing portion for limiting the movement of the motor is provided in the storage space.

[0012] Furthermore, the gear set includes gear one, gear two and gear three that are meshed in sequence; gear one is arranged on the output shaft of the motor; gear two is arranged in the storage space through a rotating shaft; gear three is arranged on the outside of the driving shaft, and the driving shaft is driven to rotate by the rotation of gear three; the torsion spring is arranged in the casing below gear three, and one of the legs of the torsion spring is connected to gear three, and the other leg is connected to the casing.

[0013] Furthermore, the gear three is a sector gear, and the gear three is provided with a clamping portion which is lower than the thickness of the gear, and the clamping portion is provided with a groove for accommodating the torsion spring support leg.

[0014] Furthermore, a recessed portion is provided inside the casing, and the recessed portion includes a main recessed groove and a secondary recessed groove which are interconnected; the main recessed groove is used to accommodate gear three, and the secondary recessed groove is used to accommodate gear two; an annular protrusion with a flush bottom edge is provided on the inner side of the main recessed groove, the annular protrusion and the main recessed groove are concentrically arranged, and an opening portion for limiting the displacement of the drive shaft is formed on the inner side of the annular protrusion, and one end of the drive shaft extends to the outside of the casing through the opening portion; a limiting groove for accommodating a torsion spring is also provided between the main recessed groove and the annular protrusion, and an extension groove for accommodating a torsion spring support foot is also provided at the limiting groove.

[0015] Furthermore, a bearing 1 and a bearing 2 are provided in the opening portion on the outer side of the driving shaft; and the bearing 1 is located between the gear 3 and the bearing 2.

[0016] The beneficial effects of the present invention compared with the prior art are:

[0017] (1) The present invention provides a torsion spring connected to the gear set, and makes the valve body of the actuator in the initial state in an open state, so that when the actuator is accidentally powered off or damaged, the gear set and the drive shaft can be reset by the rebound of the torsion spring itself, ensuring that the valve cover of the valve body can be driven to return to the initial position when the electric actuator is accidentally powered off or damaged, thereby ensuring that the automobile valve body is in an open and closed state, ensuring the normal use of the automobile exhaust system;

[0018] (2) The present invention uses a cover body and a casing to form a casing, and connects the casing and the cover body at a joint by laser welding, thereby improving the sealing effect of the casing and ensuring that the electric actuator has good dustproof and waterproof properties. The breathing membrane used can not only ensure the balance of air pressure values ​​inside and outside the actuator through its own air permeability to avoid overpressure damage to internal components, but also prevent dust and water vapor from the external environment from entering the actuator, further ensuring the dustproof and waterproof performance of the actuator.

[0019] (3) The present invention adopts a magnet block and sets a sensing chip on a PCB board corresponding to the magnet block, so that the sensing chip and the magnet block can form a sensor structure after being combined, so that the rotation angle of the drive shaft and the gear three can be sensed by the sensor structure, so that the actuator can control the actual rotation angle of the drive shaft and the gear three through the PCB board, thereby satisfying the actuator's intelligent control of the opening and closing angles of the valve body and valve cover, and ensuring the exhaust flow of the automobile exhaust system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0021] Figure 2 An exploded view of the present invention;

[0022] Figure 3 Schematic diagram of the three-dimensional structure of the cover body of the present invention

[0023] Figure 4 It is a schematic diagram of the cross-sectional structure of the present invention;

[0024] Figure 5 This is a schematic diagram of the assembly structure of the motor and the gear set inside the casing of the present invention;

[0025] Figure 6 It is a schematic diagram of the internal structure of the casing of the present invention;

[0026] Figure 7 It is a three-dimensional structural schematic diagram of the casing of the present invention;

[0027] Figure 8 It is a schematic diagram of the assembly structure of the drive shaft and gear three of the present invention.

[0028] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0029] Cover body 1, limiting plate 11, arc groove 1 12, fixing seat 1 13, guide part 14, convex ring 2 15, positioning seat 16;

[0030] Casing 2, vent hole 21, mounting portion 22, wiring portion 23, opening portion 24, recessed portion 25, main recessed groove 251, convex block 252, limiting groove 253, extension groove 254, auxiliary recessed groove 255; assembly part 26, assembly groove 261, fixing column 262, arc groove 27, fixing groove 28, fixing seat 29;

[0031] Drive shaft 3, bearing 1 31, bearing 2 32;

[0032] PCB board 4, conductive feeler 41, wiring feeler 42, induction chip 43, magnet block 44;

[0033] Motor 5;

[0034] Gear set 6, gear 1 61, gear 2 62, gear 3 63, clamping portion 631, groove 632;

[0035] Fixing member 7, fixing ring 71, limiting spring piece 72;

[0036] Torsion spring 8;

[0037] Breathing membrane9. DETAILED DESCRIPTION

[0038] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0039] Embodiment 1:

[0040] like Figure 1-Figure 8As shown, an electric actuator for a control valve of an automobile exhaust system comprises a shell with a storage space inside, a motor 5 arranged in the storage space, and a gear set 6 arranged in the storage space and connected to the motor 5; the shell also comprises a PCB board 4 for controlling the automatic opening and closing rotation of the motor 5, a drive shaft 3 connected to the gear set 6, and a torsion spring 8 for driving the gear set 6 to rotate and reset; the drive shaft 3 is arranged at the output end of the gear set 6, the PCB board 4 is arranged above the gear set 6, and the torsion spring 8 is sleeved on the rotating shaft of the gear set 6 outside the drive shaft 3; wherein the PCB board 4 is connected to the automobile ECU by wired or wireless connection, and the valve stem of the automobile exhaust valve body is connected to the drive shaft 3 of the actuator; after the electric actuator is connected to the automobile exhaust valve body, the valve stem of the valve body is connected to the drive shaft 3, and when the actuator is not working, the automobile exhaust valve The valve body is in an open state, that is, it ensures that the car can be exhausted normally; when the PCB board 4 receives the control signal, the control motor 5 works, the motor 5 will drive the gear set 6 to rotate and the driving shaft 3 to rotate, at this time the valve stem of the valve body rotates accordingly, so that the automobile valve body can adjust the opening and closing degree of the valve cover through the rotating valve stem, so as to realize the flow regulation of the valve body and the closing operation of the valve body; the gear set 6 will continuously compress the torsion spring 8 during the rotation process, if the motor 5 stops rotating normally, the motor 5 will limit the rotation of the gear set 6, so the torsion spring 8 will not change; and when the electric actuator is accidentally powered off or damaged, the restriction of the motor 5 on the gear set 6 disappears, and the gear set 6 will reset under the rebound force of the torsion spring 8, ensuring that the electric actuator will drive the driving shaft 3 to rotate, so that the valve cover of the valve body returns to the initial position, thereby ensuring that the automobile valve body is in an open and closed state, ensuring the normal use of the automobile exhaust system;

[0041] See also Figure 1 , Figure 2 , Figure 4 In this embodiment, the shell includes a cover body 1 and a casing 2; the cover body 1 and the casing 2 are tightly fitted and form a storage space inside the casing 2; the connection between the cover body 1 and the casing 2 is sealed by laser welding; wherein, the opening end of the casing 2 is recessed inward to form a circle of convex ring 1, and the outer edge of the cover body 1 is provided with a circle of convex ring 2 15, and the convex ring 1 matches the shape of the convex ring 2 15, so that after the cover body 1 and the casing 2 are tightly fitted, the convex ring 1 and the convex ring 2 15 are mutually abutted and engaged, and a step-shaped sealing part is formed at the joint of the cover body 1 and the casing 2, and after the sealing part is laser welded, the seam disappears, which effectively improves the sealing of the connection between the cover body 1 and the casing 2, and prevents environmental dust and water vapor from entering the storage space through the assembly gap between the cover body 1 and the casing 2, further improving the sealing effect of the shell;

[0042] In this embodiment, the housing 2 is further provided with a mounting portion 22, and the mounting portion 22 is provided with mounting holes, and the mounting holes are provided with bushings, so that the housing 2 can be stably assembled with other components through the mounting portion 22;

[0043] See also Figure 3 , Figure 5-Figure 7 In this embodiment, the storage space is provided with a positioning portion for limiting the displacement of the motor 5 and the gear set 6; wherein the positioning portion includes a limiting member 1 for limiting the displacement of the motor 5 and a limiting member 2 for limiting the displacement of the gear set 6; the limiting member 1 includes an arc groove 12 arranged in the cover body 1, limiting plates 11 arranged at both ends of the arc groove 12, and an arc groove 27 arranged in the casing 2; the arc groove 12 and the arc groove 27 are adapted to the external shape of the motor 5, so that after the cover body 1 and the casing 2 are fitted, the arc groove 12 and the arc groove 27 are butted against each other and form an arc cavity similar to a cylindrical shape for accommodating the motor 5; in this embodiment, a fixing member 7 is also provided in the casing 2, and the fixing member 7 includes a fixing ring 71 and a limiting spring sheet 72; the fixing ring 71 is provided on both sides There is a fixing hole, which can lock the motor 5 inside the arc groove 27 by cooperating with the fixing bolt; the limiting spring piece 72 can elastically press the motor 5 in the arc groove 27, and cooperate with the limiting plates 11 at both ends to effectively limit the up and down, left and right and front and back displacements of the motor 5; the limiting member 2 includes a fixing seat 13, a positioning seat 16 and a fixing seat 29 arranged inside the housing 2, which are used to limit the up and down displacement of the gear set 6 and ensure the stable rotation of the gear set 6; in this embodiment, one end of the arc groove 27 is provided with an assembly groove 261 for accommodating the limiting spring piece 72 and a fixing column 262 for locking with a fixing bolt used in conjunction with the fixing ring 71, so that the assembly groove 261 and the fixing column 262 form an auxiliary assembly part 26 of the fixing member 7 inside the housing 2;

[0044] In this embodiment, the cover body 1 is further provided with a guide portion 14 for positioning the cover body 1 and the housing 2 during assembly;

[0045] See also Figure 1-Figure 2 , Figure 4-Figure 7In this embodiment, a protruding wiring portion 23 is provided on the outer surface of the housing 2; the wiring portion 23 is set as a hollow structure, and a conductive through hole is provided between the hollow cavity of the wiring portion 23 and the storage space; wherein a conductive structure is provided between the PCB board 4 and the motor 5, and the conductive structure includes a wiring antenna 42 connected to the PCB board 4 and a conductive antenna 41 connected to the motor 5; the wiring antenna 42 is in an "L"-shaped structure, and the conductive antenna 41 is in a "U"-shaped structure, one end of the wiring antenna 42 extends through the conductive through hole to the hollow cavity of the wiring portion 23, one end of the conductive antenna 41 is connected to the PCB board 4, and the other end is connected to the conductive electrode of the motor 5, so that when the electric actuator is connected to the external circuit, the working power supply of the PCB board 4 can be connected through the wiring antenna 42, so that after the PCB board 4 receives the control signal, the motor 5 is controlled to rotate and work; in this embodiment, a fixing groove 28 for fixing the conductive antenna 41 is also provided inside the housing 2 to ensure that the conductive electrode of the motor 5 can be stably connected to the conductive antenna 41;

[0046] See also Figure 1 , Figure 4 , Figure 6 , Figure 7 In this embodiment, the housing 2 is further provided with an air hole 21, and a breathing membrane 9 is provided in the air hole 21 for balancing the air pressure value inside and outside the actuator; in this embodiment, the breathing membrane 9 is a breathable and water-blocking membrane, so that while ensuring the air pressure value inside and outside the actuator, it blocks dust and water vapor from the external environment from entering the interior of the actuator, thereby ensuring the dustproof and waterproof performance of the actuator;

[0047] See also Figure 2 , Figure 4 , Figure 5In this embodiment, the gear set 6 includes a gear 1 61, a gear 2 62 and a gear 3 63 that mesh in sequence; the gear 1 61 is sleeved on the output shaft of the motor 5; the gear 2 62 is arranged in the storage space through a rotating shaft; the gear 3 63 is sleeved on the outside of the drive shaft 3, and the drive shaft 3 is driven to rotate by the rotation of the gear 3 63; the torsion spring 8 is arranged in the housing 2 below the gear 3 63, and one leg of the torsion spring 8 is connected to the gear 3 63, and the other leg is connected to the housing 2; wherein, the gear 2 62 is a "T"-shaped gear, and the upper gear ring diameter of the gear 2 62 is larger, and the lower gear ring diameter is smaller; when the gear 1 61, the gear 2 62, and the gear 3 63 are assembled in sequence, the gear 1 61 The upper tooth ring of the gear 2 62 is meshed with each other, and the lower tooth ring of the gear 2 62 is meshed with the gear 3 63. After assembly, the transmission ratio of the gear set 6 can be guaranteed, and the space occupied by the gear set 6 as a whole can be reduced, thereby optimizing the overall size of the electric actuator, reducing the volume of the electric actuator, and facilitating the assembly and use of the electric actuator; and the two legs of the torsion spring 8 are respectively connected to the gear 3 63 and the housing 2, so that during the rotation of the gear set 6, the legs of the torsion spring 8 at the gear 3 63 move, and the legs of the torsion spring 8 at the housing 2 are stuck, thereby driving the torsion spring 8 to deform, so that the torsion spring 8 generates torque, ensuring that when the electric actuator is accidentally powered off or damaged, the torsion spring 8 has sufficient strength (rebound force) to push the gear set 6 to rotate and reset;

[0048] See also Figure 2 , Figure 5 , Figure 8 In this embodiment, the gear three 63 is a sector gear, and the gear three 63 is provided with a clamping portion 631 which is lower than the thickness of the gear, and the clamping portion 631 is provided with a groove 632 for accommodating the leg of the torsion spring 8; wherein, when the torsion spring 8 is connected to the gear three 63, the leg of the torsion spring 8 can be clamped into the groove 632 of the clamping portion 631, and when the gear three 63 rotates, the clamping portion 631 can push the leg of the torsion spring 8 to rotate synchronously, thereby driving the torsion spring 8 to deform, ensuring that the torsion spring 8 has sufficient resilience when used as a reset member to drive the gear three 63 to rotate and reset;

[0049] See also Figure 5-Figure 7In this embodiment, a recessed portion 25 is provided inside the housing 2, and the recessed portion 25 includes a main recessed groove 251 and a secondary recessed groove 255 that are interconnected; the main recessed groove 251 is used to accommodate the gear three 63, and the secondary recessed groove 255 is used to accommodate the gear two 62; an annular protrusion whose bottom edge is flush is provided on the inner side of the main recessed groove 251, and the annular protrusion and the main recessed groove 251 are concentrically arranged, and an opening portion 24 for accommodating the drive shaft 3 is formed on the inner side of the annular protrusion, and one end of the drive shaft 3 extends to the outside of the housing through the opening portion 24; a limiting groove 253 for accommodating the torsion spring 8 is also provided between the main recessed groove 251 and the annular protrusion, and a An extension groove 254 for accommodating the support leg of the torsion spring 8; wherein the recessed portion 25 can optimize the structure of the housing 2, so that the gear 2 62 and the gear 3 63 can be stably assembled and connected in the recessed portion 25, and the annular protrusion can effectively support the gear 3 63, the limiting groove 253 can be used to accommodate the torsion spring 8, and the extension groove 254 can limit the displacement of the support leg of the torsion spring 8, ensuring that when the gear 3 63 pushes the torsion spring 8 to rotate, the other end of the torsion spring 8 generates a certain resistance, thereby allowing the torsion spring 8 to be deformed under force; and the drive shaft 3 extending to the outside of the housing through the opening portion 24 can be conveniently connected to the valve stem of the automobile valve body, thereby driving the automobile valve stem to rotate and controlling the working state of the valve body;

[0050] In this embodiment, a protrusion 252 is provided in the main recessed groove 251. When one leg of the torsion spring 8 is inserted into the groove 632 of the clamping portion 631 of the gear three 63, the clamping portion 631 of the gear three 63 that is not in contact with the torsion spring 8 contacts the protrusion 252 under the action of the torsion spring 8, so that the protrusion 252 can limit the rotation angle of the gear three 63, ensuring that the gear three 63 can be blocked and limited by the protrusion 252 when it is reset under the action of the torsion spring 8, so that the gear set 6 returns to the initial state;

[0051] See also Figure 4 , Figure 8 In this embodiment, a bearing 1 31 and a bearing 2 32 are provided in the opening portion 24 outside the driving shaft 3; the bearing 1 31 is located between the gear 3 63 and the bearing 2 32; wherein the bearing 1 31 can be a needle bearing, and the bearing 2 32 can be an oil-containing bearing, so that when the driving shaft 3 is arranged in the opening portion 24 of the housing 2, it can maintain its own stability and flexible rotation;

[0052] In this embodiment, a magnet block 44 is further provided in the center of the gear three 63 above the driving shaft 3, and a sensing chip 43 is provided on the PCB board 4 directly facing the magnet block 44, so that the sensing chip 43 and the magnet block 44 can form a sensor structure after being combined to sense the rotation angle of the driving shaft 3 and the gear three 63, so that after the driving shaft 3 and the gear three 63 rotate to the set angle, the PCB board 4 controls the motor 5 to stop rotating, and then the actuator can control the actual use angle of the driving shaft 3 and the gear three 63 through the PCB board 4, so as to meet the intelligent control of the actuator on the opening and closing angle of the valve body and the valve cover, and ensure the exhaust flow of the automobile exhaust system;

[0053] In summary, the electric actuator for an automobile exhaust system control valve provided by the present invention, by setting a torsion spring 8 connected to the gear set 6, can drive the valve stem of the valve body connected to the drive shaft 3 to rotate when the actuator drives the gear set 6 to rotate through the motor 5 and links the drive shaft 3 to rotate, and adjust the opening and closing degree of the valve cover by the rotating valve stem, so as to realize the operation of automatic flow adjustment or closing of the valve body; when the electric actuator is accidentally powered off or damaged, the torsion spring 8 can drive the gear set 6 and the drive shaft 3 to reset through its own rebound, so as to ensure that the valve cover of the valve body will be driven to rotate to the initial position when the electric actuator is accidentally powered off or damaged, thereby ensuring that the automobile valve body is in an open and closed state, and ensuring the normal use of the automobile exhaust system.

[0054] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0055] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An electric actuator for an automobile exhaust system control valve, comprising a housing with a storage space inside, a motor (5) arranged in the storage space, and a gear set (6) arranged in the storage space and connected to the motor (5); characterized in that: The housing further comprises a PCB board (4) for controlling the automatic opening and closing rotation of the motor (5), a driving shaft (3) connected to the gear set (6), and a torsion spring (8) for driving the gear set (6) to rotate and reset; the driving shaft (3) is arranged at the output end of the gear set (6), the PCB board (4) is arranged above the gear set (6), and the torsion spring (8) is sleeved on the rotating shaft of the gear set (6) outside the driving shaft (3); the gear set (6) comprises a gear 1 (61), a gear 2 (62) and a gear 3 (64) meshing in sequence. (62) and gear three (63); the gear one (61) is sleeved on the output shaft of the motor (5); the gear two (62) is arranged in the storage space through a rotating shaft; the gear three (63) is sleeved on the outer side of the drive shaft (3), and the drive shaft (3) is driven to rotate by the rotation of the gear three (63); the torsion spring (8) is arranged in the housing (2) below the gear three (63), and one leg of the torsion spring (8) is connected to the gear three (63), and the other leg is connected to the housing (2); the gear three (6 3) is a sector gear, the gear three (63) is provided with a clamping portion (631) which is lower than the thickness of the gear, and the clamping portion (631) is provided with a groove (632) for accommodating the support leg of the torsion spring (8); the housing (2) is provided with a recessed portion (25), and the recessed portion (25) includes a main recessed groove (251) and a secondary recessed groove (255) which are connected to each other; the main recessed groove (251) is used to accommodate the gear three (63), and the secondary recessed groove (255) is used to accommodate the gear two (62); the main recessed groove (251) is used to accommodate the gear three (63), and the secondary recessed groove (255) is used to accommodate the gear two (62); An annular protrusion with a flush bottom edge is provided on the inner side of the recessed groove (251); the annular protrusion and the main recessed groove (251) are arranged concentrically; an opening portion (24) for limiting the displacement of the drive shaft (3) is formed on the inner side of the annular protrusion; one end of the drive shaft (3) extends to the outside of the shell through the opening portion (24); a limiting groove (253) for accommodating a torsion spring (8) is also provided between the main recessed groove (251) and the annular protrusion; an extension groove (254) for accommodating a support leg of the torsion spring (8) is also provided at the limiting groove (253).

2. The electric actuator for an automobile exhaust system control valve according to claim 1, characterized in that: The shell comprises a cover body (1) and a casing (2); the cover body (1) and the casing (2) are tightly fitted together to form a storage space inside the casing (2); and the connection between the cover body (1) and the casing (2) is sealed by laser welding.

3. An electric actuator for an automobile exhaust system control valve as claimed in claim 2, characterized in that: The storage space is provided with a positioning portion for limiting the displacement of the motor (5) and the gear set (6).

4. The electric actuator for an automobile exhaust system control valve as claimed in claim 2, characterized in that: The outer surface of the housing (2) is provided with a protruding wiring portion (23); the wiring portion (23) is configured as a hollow structure, and a conductive through hole is provided between the hollow cavity of the wiring portion (23) and the storage space.

5. The electric actuator for an automobile exhaust system control valve as claimed in claim 4, characterized in that: The housing (2) is also provided with an air vent (21), and a breathing membrane (9) is provided in the air vent (21) for balancing the air pressure values ​​inside and outside the actuator.

6. The electric actuator for an automobile exhaust system control valve according to claim 1, characterized in that: A first bearing (31) and a second bearing (32) are provided in the opening portion (24) outside the driving shaft (3); the first bearing (31) is located between the third gear (63) and the second bearing (32).

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