Gear driving mechanism of automobile actuator

Abstract

The utility model relates to an automobile actuator gear driving mechanism which comprises a micromotor, a worm, a worm gear, a first transmission gear, a second transmission gear and an output gear, the worm is fixedly arranged on an output shaft of the micromotor, the worm gear is in meshed transmission with the worm, the first transmission gear is in meshed transmission with the worm gear, and the second transmission gear is in meshed transmission with the output gear. The second transmission gear is in meshing transmission with the first transmission gear, and the output gear is in meshing transmission with the second transmission gear; the output gear comprises a plastic central rotating shaft and a powder metallurgy gear ring arranged on the plastic central rotating shaft; the actuator can integrate different circuit board assemblies (the potentiometer circuit board assembly, the Hall switch circuit board assembly and the 3D Hall circuit board assembly), so that switching of angle control modes of the actuator is achieved, and the actuator has the advantages of being small in size, high in universality, low in development cost, short in development period and the like. The gear driving mechanism is suitable for a large-torque (more than 5N. M) automobile actuator.

Description

Technical Field

[0001] The utility model relates to the field of automobile parts, in particular to a gear driving mechanism of an automobile actuator. Background Art

[0002] As more and more new energy vehicle automation equipment is used, some high-torque actuators have appeared on the market. Some of these actuators use plastic gears. In order to ensure the strength of the gears, the actuators using plastic gears are often large in size and cannot meet the customer's space adaptation requirements; some use powder metallurgy gears. Since powder metallurgy gears are not resistant to salt spray, these products cannot meet the customer's salt spray test requirements.

[0003] The actuator angle control methods are generally divided into potentiometer control, Hall switch control and 3D Hall chip control. Different customers will choose different actuator angle control methods according to their own needs. At present, the actuators on the market cannot be compatible with the above three methods at the same time, and the compatibility is poor. If the angle control method needs to be switched, the actuator structure needs to be readjusted and the mold needs to be re-opened. Since the actuator structure is relatively complex and contains many parts, the re-opening of the mold has high development costs and a long cycle. Utility Model Content

[0004] In order to solve the above problems, the utility model provides an automobile actuator gear drive mechanism, which is compatible with a platform actuator with potentiometer control, Hall switch control and 3D Hall control operating angle.

[0005] The technical solution adopted by the utility model is: an automobile actuator gear drive mechanism, characterized in that it includes a micro motor, a worm, a worm wheel, a first transmission gear, a second transmission gear and an output gear, a worm is fixedly provided on the output shaft of the micro motor, the worm wheel meshes with the worm for transmission, the first transmission gear meshes with the worm wheel for transmission, the second transmission gear meshes with the first transmission gear for transmission, and the output gear meshes with the second transmission gear for transmission; the output gear includes a plastic central rotating shaft and a powder metallurgy gear ring arranged on the plastic central rotating shaft.

[0006] Preferably, the plastic central rotating shaft is connected to the powder metallurgy gear ring for transmission via a spline hole, and the shaft hole at the lower end of the plastic central rotating shaft is a D-type hole.

[0007] Preferably, an annular positioning groove is provided on the lower end surface of the plastic central rotating shaft.

[0008] Preferably, the shaft hole at the lower end of the plastic central shaft is connected to the upper end of the shaft, and the lower end of the shaft is inserted into the potentiometer.

[0009] Preferably, a cylindrical magnet is provided in the shaft hole at the lower end of the plastic central shaft, and the cylindrical magnet corresponds to the 3D Hall chip below.

[0010] Preferably, an annular magnet is provided on the output shaft of the micromotor, and the annular magnet corresponds to the Hall switch below.

[0011] Preferably, the worm is meshed with the large teeth of the worm wheel for transmission, the small teeth of the worm wheel are meshed with the large teeth of the first transmission gear for transmission, the small teeth of the first transmission gear are meshed with the large teeth of the second transmission gear for transmission, and the small teeth of the second transmission gear are meshed with the output gear for transmission.

[0012] Preferably, the large teeth of the second transmission gear are made of plastic gears, and the small teeth are made of powder metallurgy gears.

[0013] Preferably, the worm gear is arranged on the first transmission shaft, the first transmission gear is arranged on the second transmission shaft, and the second transmission gear is arranged on the third transmission shaft; the output gear is positioned on the first output gear positioning rib and the second output gear positioning rib of the base through an annular positioning groove.

[0014] Preferably, the first transmission shaft, the second transmission shaft and the third transmission shaft are arranged in corresponding shaft holes of the base and the upper cover.

[0015] The beneficial effects achieved by the utility model are: the utility model is applied to the automobile actuator, and different circuit board components (potentiometer circuit board component, Hall switch circuit board component and 3D Hall circuit board component) can be integrated to realize the switching of the actuator angle control mode, and it has the advantages of small size, strong versatility, low development cost and short development cycle; it is suitable for the gear drive mechanism of automobile actuator with large torque (rated torque 2 to 4 N.m, stalled 5 N.m or more); the utility model has the following advantages:

[0016] 1. The final gear (output gear) ring gear adopts powder metallurgy gear, which can effectively increase the gear strength and the actuator volume is small;

[0017] 2. The output gear assembly adopts the conversion form of plastic output shaft + powder metallurgy gear, which can improve the salt spray resistance of the product, reduce costs and reduce product weight;

[0018] 3. The second transmission gear adopts the assembly form of plastic gear + powder metallurgy gear, which can reduce cost and product weight;

[0019] 4. The structural space layout is more reasonable, which enables the control methods that originally required three different structural solutions to be integrated into one actuator, greatly reducing the product development cost and cycle. The product is more versatile and suitable for platform promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is the overall structural diagram of the automobile actuator;

[0021] Figure 2 for Figure 1 Bottom view of

[0022] Figure 3 for Figure 2 Middle AA section view;

[0023] Figure 4 is a schematic diagram of the structure of the base assembly;

[0024] Figure 5 It is a schematic diagram of the structure of the upper cover;

[0025] Figure 6 It is a schematic diagram of the structure of the potentiometer circuit board;

[0026] Figure 7 It is a structural schematic diagram of the Hall switch circuit board;

[0027] Figure 8 It is a schematic diagram of the structure of a 3D Hall circuit board;

[0028] Fig. 9 The exploded diagram of the drive mechanism when the potentiometer control method is adopted;

[0029] Fig.10 This is a schematic diagram of the structure after removing the upper cover when the potentiometer control method is adopted;

[0030] Fig.11 Partial cross-sectional view when using potentiometer control;

[0031] Fig.12 The exploded diagram of the drive mechanism when the Hall switch control method is adopted;

[0032] Fig.13 This is a schematic diagram of the structure after removing the upper cover when the Hall switch control method is adopted;

[0033] Fig.14 This is a schematic diagram of the position relationship between the Hall switch and the ring magnet when the Hall switch control method is adopted;

[0034] Fig.15 The exploded diagram of the drive mechanism when the 3D Hall control method is adopted;

[0035] Fig.16 This is a schematic diagram of the structure after removing the upper cover when using the 3D Hall control method;

[0036] Fig.17 Partial cross-sectional view when using 3D Hall control method;

[0037] Fig.18Schematic diagram of the position relationship between the 3D Hall chip and the cylindrical magnet when the 3D Hall control method is adopted;

[0038] Fig.19 Schematic diagram of the output gear structure;

[0039] Fig. 20 for Fig.19 A cross-sectional view of

[0040] Fig.21 It is a schematic diagram of the structure of the powder metallurgy gear ring of the output gear;

[0041] Fig. 22 is a structural schematic diagram of the second transmission gear;

[0042] Fig.23 for Fig. 22 AA section view;

[0043] Fig.24 is a schematic structural diagram of the small teeth of the second transmission gear;

[0044] In the figure: 1, base assembly; 11, base body; 12, welding rib; 13, first transmission shaft hole; 14, second transmission shaft hole; 15, third transmission shaft hole; 16, guide hole; 17, circuit board positioning column; 18, circuit board hot riveting column; 19, output gear first positioning rib; 110, output gear second positioning rib; 111, connector pin welding end; 112, motor long pin welding end; 113, motor short pin welding end; 114, motor short pin plug end; 115, motor long pin plug end;

[0045] 2. Upper cover; 21. Welding groove; 22. Transmission shaft hole; 23. Guide column; 24. First matching hole; 25. Second matching hole;

[0046] 3. Micro motor; 4. Circuit board assembly; 41. Circuit board positioning hole; 42. Circuit board hot riveting hole; 43. Circuit board welding hole;

[0047] 51. Worm; 52. Worm wheel; 53. First transmission gear; 54. Second transmission gear; 541. Second transmission gear large tooth; 542. Second transmission gear small tooth; 55. Output gear; 551. Powder metallurgy gear ring; 552. Plastic center shaft; 553. Annular positioning groove; 56. First transmission shaft; 57. Second transmission shaft; 58. Third transmission shaft; 6. Star-shaped sealing ring; 72. Shaft; 71. Potentiometer; 81. Hall switch; 82. Ring magnet; 91. 3D Hall chip; 92. Cylindrical magnet. DETAILED DESCRIPTION

[0048] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0049] like Figure 1-24 As shown, the utility model is a gear drive mechanism for an automobile actuator, comprising a micro motor 3, a worm 51, a worm wheel 52, a first transmission gear 53, a second transmission gear 54 and an output gear 55. The output shaft of the micro motor 3 is fixed with a worm 51, the worm wheel 52 meshes with the worm 51 for transmission, the first transmission gear 53 meshes with the worm wheel 52 for transmission, the second transmission gear 54 meshes with the first transmission gear 53 for transmission, and the output gear 55 meshes with the second transmission gear 54 for transmission. Figure 19-21 As shown, the output gear 55 includes a plastic central rotating shaft 552 and a powder metallurgy gear ring 551 arranged on the plastic central rotating shaft 552. The matching form of the plastic output shaft and the powder metallurgy gear can improve the salt spray resistance of the product, reduce costs, and reduce product weight.

[0050] In this embodiment, the plastic central rotating shaft 552 is connected to the powder metallurgy gear ring 551 through a spline hole, and the shaft hole at the lower end of the plastic central rotating shaft 552 is a D-shaped hole.

[0051] In this embodiment, the lower end surface of the plastic central rotating shaft 552 is symmetrically provided with an annular positioning groove 553. The output gear 55 is positioned on the first output gear positioning rib 19 and the second output gear positioning rib 110 of the base through the annular positioning groove 553.

[0052] In this embodiment, the shaft hole at the lower end of the plastic central shaft 552 is connected to the upper end of the shaft 72, and the lower end of the shaft 72 is inserted into the potentiometer 71, which is suitable for the potentiometer control method.

[0053] In this embodiment, a cylindrical magnet 92 is provided in the shaft hole at the lower end of the plastic central shaft 552. The cylindrical magnet 92 corresponds to the 3D Hall chip 91 below and is suitable for the 3D Hall control method.

[0054] In this embodiment, an annular magnet 82 is disposed on the output shaft of the micromotor 3 , and the annular magnet 82 corresponds to the Hall switch 81 below, and is suitable for the Hall switch control mode.

[0055] In this embodiment, the worm 51 meshes with the large teeth of the worm wheel 52 for transmission, the small teeth of the worm wheel 52 meshes with the large teeth of the first transmission gear 53 for transmission, the small teeth of the first transmission gear 53 meshes with the large teeth 541 of the second transmission gear for transmission, and the small teeth 542 of the second transmission gear meshes with the output gear 55 for transmission, forming a reduction transmission form (equivalent to the function of a reducer).

[0056] In this embodiment, the second transmission gear large teeth 541 are made of plastic gears, and the second transmission gear small teeth 542 are made of powder metallurgy gears. The combination of metal gears and plastic gears is used to improve gear strength, reduce product weight, and reduce costs.

[0057] In this embodiment, the worm gear 52 is arranged on the first transmission shaft 56, the first transmission gear 53 is arranged on the second transmission shaft 57, and the second transmission gear 54 is arranged on the third transmission shaft 58; the first transmission shaft 56, the second transmission shaft 57 and the third transmission shaft 58 are all made of steel shafts and are arranged in the corresponding shaft holes of the base assembly 1 and the upper cover 2.

[0058] like Figure 1-18 As shown, the gear drive mechanism of the utility model is applied to automobile actuators, and is compatible with platform actuators with potentiometer control, Hall switch control and 3D Hall control operating angles, and is suitable for large torque (rated torque 2 to 4 N.m, stalled 5 N.m or more) automobile actuator gear drive mechanisms.

[0059] Combination Figure 1-3 As shown, the automobile actuator includes a base assembly 1 and an upper cover 2. The upper cover 2 covers the base assembly 1. A micromotor 3, a gear transmission assembly and a circuit board assembly 4 are sealed between the base assembly 1 and the upper cover 2. The micromotor 3 and the circuit board assembly 4 are both fixedly arranged on the base assembly 1. The circuit board assembly 4 is provided with a detection assembly for detecting the angular position of the micromotor. The micromotor 2 drives the gear transmission assembly to move.

[0060] When the potentiometer control method is adopted, the circuit board assembly 4 is a potentiometer circuit board assembly, and the potentiometer 71 (such as Figure 6 ); When the Hall switch control mode is adopted, the circuit board assembly 4 is a Hall switch circuit board assembly, by integrating the Hall switch 81 (such as Figure 7 ); When the 3D Hall control method is adopted, the circuit board assembly 4 is a 3D Hall circuit board assembly, by integrating a 3D Hall chip 91 (such as Figure 8 ).

[0061] Combination Figure 3As shown, in this embodiment, the gear transmission assembly includes a worm 51, a worm wheel 52, a first transmission gear 53, a second transmission gear 54 and an output gear 55. The worm 51 is connected to the output shaft of the micromotor 2 for transmission, the worm 51 is meshed with the large teeth of the worm wheel 52 for transmission, the small teeth of the worm wheel 52 are meshed with the large teeth of the first transmission gear 53 for transmission, the small teeth of the first transmission gear 53 are meshed with the large teeth of the second transmission gear 54 for transmission, and the small teeth of the second transmission gear 54 are meshed with the output gear 55 for transmission.

[0062] In this embodiment, the output gear 55 includes a plastic central rotating shaft 552 and a powder metallurgy gear ring 551 disposed on the plastic central rotating shaft 552. The plastic output shaft 552 and the powder metallurgy gear 551 are matched to improve the salt spray resistance of the product, reduce costs, and reduce product weight. The plastic central rotating shaft 552 is connected to the powder metallurgy gear ring 551 through a spline hole, and the lower end shaft hole is a D-shaped hole; the lower end surface of the plastic central rotating shaft is provided with an annular positioning groove 553.

[0063] In this embodiment, the small teeth of the second transmission gear 54 are powder metallurgy gears, and the large gears are plastic gears. The combination of metal gears and plastic gears is used to improve gear strength, reduce product weight, and reduce costs.

[0064] Combination Figure 4 As shown, the base assembly 1 includes a base body 11, on which a first transmission shaft hole 13, a second transmission shaft hole 14, a third transmission shaft hole 15 and an output gear positioning hole are provided. A first transmission shaft 56 is provided in the first transmission shaft hole 13, a second transmission shaft 57 is provided in the second transmission shaft hole 14, and a third transmission shaft 58 is provided in the third transmission shaft hole 15. The first transmission shaft 56, the second transmission shaft 57 and the third transmission shaft 58 are made of steel shafts; the worm gear 52 is arranged on the first transmission shaft 56, the first transmission gear 53 is arranged on the second transmission shaft 57, and the second transmission gear 54 is arranged on the third transmission shaft 57; the output gear positioning hole is provided with an output gear first positioning rib 19 and an output gear second positioning rib 110 which are intermittently symmetrically arranged, and the output gear 55 is arranged on the base body 1 through the first output gear positioning rib 19 and the second output gear positioning rib 110 (the first output gear positioning rib 19 and the second output gear positioning rib 110 cooperate with the annular positioning groove 553).

[0065] In this embodiment, the base body 11 is protruding on all sides and forms a cavity in the middle; the micro motor 3 and the circuit board assembly 4 are both fixedly mounted in the cavity of the base body 11 .

[0066] The base body 11 is provided with a circuit board positioning column 17 and a circuit board heat riveting column 18 that cooperate with the circuit board assembly 4, and a micro-motor mounting groove for mounting the micro-motor 3. The base body 11 is provided with a guide hole 16 that cooperates with the upper cover 2. The top of the protruding parts around the base body 11 is provided with continuous welding ribs 12.

[0067] Combination Figure 5 As shown, the upper cover 2 is provided with a welding groove 21, a transmission shaft hole 22, a guide column 23, a first matching hole 24 and a second matching hole 25, the welding rib 12 on the base body 11 cooperates with the welding groove 21 on the upper cover 2, and laser welding is adopted to form a sealed whole; the first transmission shaft 56, the second transmission shaft 57 and the third transmission shaft 58 are arranged in the transmission shaft holes 22 corresponding to the upper cover 2; the guide column 23 of the upper cover 2 is inserted into the guide hole 16 corresponding to the base body 11; the first matching hole 24 and the second matching hole 25 form a stepped hole form, the outer diameter of the first matching hole 24 is smaller than the second matching hole 25, the upper end of the output gear 55 passes through the upper cover, the central shaft of the output gear 55 cooperates with the first matching hole 24, and a star-shaped sealing ring 6 is provided between the central shaft of the output gear 55 and the second matching hole 25 (which not only plays a sealing role, but also can position the output gear 55).

[0068] The base body 11 is provided with a connector pin welding end 111, a motor long pin welding end 112, a motor short pin welding end 113, a motor short pin plugging end 114 and a motor long pin plugging end 115. The connector pin welding end 111 is used to connect the circuit board assembly 4 with the external circuit, and the motor long pin welding end 112, the motor short pin welding end 113, the motor short pin plugging end 114 and the motor long pin plugging end 115 are used to connect the micro motor 3 with the circuit board assembly 4 circuit.

[0069] Combination Figure 9-11 As shown, when the potentiometer control method is adopted, the detection component includes a rotating shaft 71 and a potentiometer 72, and the rotating shaft 71 is arranged at the lower end of the central rotating shaft of the output gear 55; the potentiometer 72 is arranged on the circuit board assembly 4, and is directly below the rotating shaft 71; the micromotor 3 rotates, and drives the first transmission gear 53 and the second transmission gear 54 to rotate synchronously through the worm 51 and the worm wheel 52, and further drives the output gear 55 to rotate; the output gear 55 drives the rotating shaft 71 at the lower end to rotate, and the rotation drives the potentiometer 72 to rotate, and the potentiometer 72 directly feeds back the rotation angle of the output gear 55 to the ECU.

[0070] Combination Figure 12-14As shown, when the Hall switch control method is adopted, the detection component includes an annular magnet 82 and a Hall switch 81. The annular magnet 82 is arranged on the output shaft of the micro motor 3, and the annular magnet 82 is radially magnetized; the Hall switch 81 is arranged on the circuit board assembly 4, and is directly below the annular magnet 82; the micro motor 3 rotates, driving the annular magnet 82 on the output shaft to rotate, and the Hall switch 81 below the annular magnet 82 senses the change in the magnetic field, counts the number of rotations of the worm 51, and feeds back the operating angle to the ECU.

[0071] The length of the metal transmission shaft of the micromotor 3 is 18 to 22 mm, the transmission shaft of the micromotor 3 is interference fit with the worm 51 (the worm length is 8 to 15 mm), and the thickness of the Hall switch 81 is 1.5 to 3.5 mm; the annular magnet 82 is interference fit with the transmission shaft of the micromotor 3, and after the fit, the extension of the transmission shaft of the micromotor 3 is 1 to 4 mm (during the design, the transmission shaft of the micromotor 3 is long enough to ensure that it can pass through the worm 51 and the annular magnet 82 at the same time, and to ensure that there is enough assembly space for the annular magnet 82 on the transmission shaft of the micromotor 3); the distance D1 between the circuit board assembly 4 and the axis of the micromotor 3 is 4 to 9 mm, and the gap between the Hall switch 81 and the annular magnet 82 is 1 mm to 8 mm.

[0072] Combination Figure 15-18 As shown, when the 3D Hall control method is adopted, the detection component includes a cylindrical magnet 92 and a 3D Hall chip 91. The cylindrical magnet 92 is arranged at the lower end of the central shaft of the output gear 55, and the cylindrical magnet 92 is axially magnetized; the 3D Hall chip 91 is arranged on the circuit board assembly 4, and is directly below the cylindrical magnet 92; the micromotor 3 rotates, and drives the first transmission gear 53 and the second transmission gear 54 to rotate synchronously through the worm 51 and the worm wheel 52, and further drives the output gear 55 to rotate; the output gear 55 drives the cylindrical magnet 92 at the lower end to rotate, and the 3D Hall chip 91 below the cylindrical magnet 92 senses the change in the magnetic field, and directly feeds back the rotation angle of the output gear 55 to the ECU.

[0073] The gap D2 from the 3D Hall chip 91 to the cylindrical magnet 92 is 0.8mm~5mm, and a transmission shaft hole is set on the base assembly 1. The transmission shaft hole and the transmission shaft are interference fit. The worm gear 51 and the transmission gear (the first transmission gear 53 and the second transmission gear 54) rotate along the transmission shaft (the first transmission shaft 56 and the second transmission shaft 57). The interference between the gears and the circuit board assembly 4 is not avoided. The distance between the positioning surface of the worm gear 52 and the positioning surface of the transmission gear (the first transmission gear 53 and the second transmission gear 54) and the circuit board assembly 4 needs to be greater than 0.3mm; the end surface clearance between the worm gear 52 and the transmission gear (the first transmission gear 53 and the second transmission gear 54), and the end surface clearance between the transmission gear (the first transmission gear 53 and the second transmission gear 54) and the output gear 55 is greater than 0.3mm.

[0074] It should be noted that the description of the above technical solutions is exemplary, and this specification can be embodied in different forms and should not be interpreted as being limited to the technical solutions set forth herein. On the contrary, providing these descriptions will make the disclosure of the utility model thorough and complete, and will fully convey the scope disclosed in this specification to those skilled in the art. In addition, the technical solution of the utility model is limited only by the scope of the claims.

[0075] Finally, it should be pointed out that the above embodiments are only representative examples of the present utility model. Obviously, the present utility model is not limited to the above embodiments, and there are many variations. Any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present utility model shall be considered to belong to the protection scope of the present utility model.

Claims

1. An automotive actuator gear drive mechanism, characterized in that: It includes a micromotor, a worm, a worm wheel, a first transmission gear, a second transmission gear and an output gear. A worm is fixedly provided on the output shaft of the micromotor. The worm wheel meshes with the worm for transmission. The first transmission gear meshes with the worm wheel for transmission. The second transmission gear meshes with the first transmission gear for transmission. The output gear meshes with the second transmission gear for transmission. The output gear includes a plastic central rotating shaft and a powder metallurgy gear ring arranged on the plastic central rotating shaft.

2. The automotive actuator gear drive mechanism according to claim 1, characterized in that: The plastic central rotating shaft is connected to the powder metallurgy gear ring through a spline hole for transmission, and the shaft hole at the lower end of the plastic central rotating shaft is a D-shaped hole.

3. The automotive actuator gear drive mechanism according to claim 1, characterized in that: The lower end surface of the plastic central rotating shaft is provided with an annular positioning groove.

4. The automotive actuator gear drive mechanism according to claim 1, characterized in that: The shaft hole at the lower end of the plastic central shaft is connected to the upper end of the shaft, and the lower end of the shaft is inserted into the potentiometer.

5. The automotive actuator gear drive mechanism according to claim 1, characterized in that: A cylindrical magnet is arranged in the shaft hole at the lower end of the plastic central shaft, and the cylindrical magnet corresponds to the 3D Hall chip below.

6. The automotive actuator gear drive mechanism according to claim 1, characterized in that: An annular magnet is arranged on the output shaft of the micromotor, and the annular magnet corresponds to the Hall switch below.

7. The automotive actuator gear drive mechanism according to claim 1, characterized in that: The worm is meshed with the large teeth of the worm wheel for transmission, the small teeth of the worm wheel are meshed with the large teeth of the first transmission gear for transmission, the small teeth of the first transmission gear are meshed with the large teeth of the second transmission gear for transmission, and the small teeth of the second transmission gear are meshed with the output gear for transmission.

8. The automotive actuator gear drive mechanism according to claim 7, characterized in that: The large teeth of the second transmission gear are made of plastic gears, and the small teeth are made of powder metallurgy gears.

9. The automotive actuator gear drive mechanism according to claim 3, characterized in that: The worm gear is arranged on the first transmission shaft, the first transmission gear is arranged on the second transmission shaft, and the second transmission gear is arranged on the third transmission shaft; the output gear is positioned on the first output gear positioning rib and the second output gear positioning rib of the base through an annular positioning groove.

10. The automotive actuator gear drive mechanism according to claim 9, characterized in that: The first transmission shaft, the second transmission shaft and the third transmission shaft are arranged in corresponding shaft holes of the base and the upper cover.

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