A rudder gear arrangement structure

Abstract

The utility model discloses a rudder gear gear arrangement structure, including the casing and install in the drive motor, potentiometer, gear group and output shaft in casing, drive motor is connected with gear group transmission, gear group is connected with output shaft transmission, and output shaft is connected with potentiometer, the inside of casing has the gear cavity and motor chamber of upper and lower overlap arrangement, drive motor and potentiometer are arranged in the motor chamber respectively, and gear group sets up in the gear cavity, and drive motor is located the middle part of motor chamber. Through gear cavity and motor chamber carry out physical isolation to drive motor and gear group, avoid drive motor encroach on the installation space of gear group, improve the installation and layout space of gear group, can adopt the gear group of multistage tooth ratio to improve gear strength and transmission efficiency, promote rudder gear torque output, and drive motor central arrangement improves the gravity center distribution uniformity of rudder gear, avoids generating vibration, and need not additional counterweight, reduces material cost and assembly complexity.

Description

Technical Field

[0001] This utility model relates to the field of servo motor technology, and in particular to a servo motor gear arrangement structure. Background Technology

[0002] A servo motor is a position servo actuator that achieves high-precision angle adjustment and holding through closed-loop control, and is widely used in scenarios requiring dynamic angle changes. The gear arrangement of a servo motor significantly impacts its transmission efficiency, torque, and speed. Traditional servo motor gear arrangements place the motor on one side of the gears, resting against the inner wall of the housing. This encroaches on the mounting space of the gears, reducing their gear ratio and strength, resulting in decreased torque, lower control precision, and a higher load on the motor. Furthermore, because the motor requires winding coils and has built-in magnets, its weight differs significantly from the weight of the gears. This causes the servo motor's center of gravity to deviate from the center. When the motor rotates at high speed, this deviation exacerbates centrifugal force, leading to increased overall servo motor vibration, especially noticeable in high-speed or frequent start-stop scenarios. It can also trigger resonance, affecting the stability of the device. Especially in balance-sensitive scenarios, such as drones and gimbals, the vibration can cause camera shake, and long-term vibration may damage the camera's image stabilization module. In high-speed driving scenarios, such as robot joints, the vibration can cause the robot to wobble while walking, accelerate gear wear, and ultimately affect motion accuracy. Therefore, in these scenarios, it is necessary to add counterweights to the servo motors to correct the servo motor's center of gravity offset problem. The structure is complex and costly, so it is necessary to improve it. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a servo gear arrangement structure that increases the installation space of the servo gear, increases the gear ratio, improves the strength, adjusts the motor installation position, so that the center of gravity is located in the center of the motor, and improves the counterweight balance of the servo.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a servo gear arrangement structure, including a housing and a drive motor, a potentiometer, a gear set, and an output shaft installed in the housing. The drive motor is connected to the gear set for transmission, the gear set is connected to the output shaft for transmission, and the output shaft is connected to the potentiometer. The housing has a gear cavity and a motor cavity arranged in an overlapping manner. The drive motor and the potentiometer are respectively disposed in the motor cavity, the gear set is disposed in the gear cavity, the drive motor is located in the middle of the motor cavity, and there is an installation gap between the drive motor and the inner wall of the motor cavity.

[0005] In a further technical solution, the gear set includes a first gear, a second gear, a third gear, a fourth gear, a fifth gear, and a drive gear. The main shaft of the drive motor extends upward into the gear cavity. The drive gear is fixedly installed on the main shaft of the drive motor. The first gear and the output shaft are respectively located on both sides of the drive gear. The second gear is located above the drive gear, the third gear is located above the first gear, the fourth gear is located above the second gear, and the fifth gear is fixedly installed on the output shaft. The drive gear meshes with the first gear, the first gear meshes with the second gear, the second gear meshes with the third gear, the third gear meshes with the fourth gear, and the fourth gear meshes with the fifth gear.

[0006] In a further technical solution, a first shaft and a second shaft are vertically arranged inside the gear cavity. The second shaft is located above the drive motor, and the first shaft is located beside the second shaft. The first gear and the third gear are rotatably mounted on the first shaft, and the second gear and the fourth gear are rotatably mounted on the second shaft. The first gear, the second gear, the third gear, and the fourth gear are all double gears. The drive gear meshes with the large gear of the first gear, the small gear of the first gear meshes with the large gear of the second gear, the small gear of the second gear meshes with the large gear of the third gear, the small gear of the third gear meshes with the large gear of the fourth gear, and the small gear of the fourth gear meshes with the fifth gear.

[0007] In a further technical solution, the outer diameter of the large gear of the first gear is smaller than that of the large gear of the second gear, the outer diameter of the large gear of the second gear is larger than that of the large gear of the third gear, the outer diameter of the large gear of the third gear is the same as that of the large gear of the fourth gear, the outer diameter of the large gear of the fourth gear is smaller than that of the fifth gear, the outer diameter of the small gear of the first gear is smaller than that of the small gear of the second gear, the outer diameter of the small gear of the second gear is equal to that of the small gear of the third gear, the outer diameter of the small gear of the third gear is smaller than that of the small gear of the fourth gear, and the outer diameter of the small gear of the fourth gear is smaller than that of the fifth gear.

[0008] In a further technical solution, the housing includes an upper cover, a middle shell, and a lower shell. The upper cover is fastened to the upper part of the middle shell, and the lower shell is fastened to the lower part of the middle shell. An isolation plate is provided inside the middle shell. A gear cavity is formed between the isolation plate and the upper cover, and a motor cavity is formed between the isolation plate and the lower shell. A detection hole and a mounting hole are opened in the middle of the isolation plate. A potentiometer is snapped into the detection hole, and the main shaft of the drive motor passes upward through the mounting hole.

[0009] In a further technical solution, the output shaft is provided with a spline section, a transmission section, a connecting section and a detection section from top to bottom. The outer side of the spline section is provided with a spline groove. The fifth gear is sleeved on the transmission section. The lower part of the detection section is provided with a detection flat shaft, which passes through the detection hole and is connected to the potentiometer. The lower parts of the detection section and the spline section are respectively provided with bearings.

[0010] In a further technical solution, the outer diameter of the spline portion and the outer diameter of the connecting portion are both larger than the outer diameter of the transmission portion. A damping ring is provided between the fifth gear and the transmission portion, and at least one retaining ring is engaged with the transmission portion, with the retaining ring abutting against one side of the damping ring.

[0011] In a further technical solution, the center of the spline portion is provided with a threaded hole facing the opening direction, the spline portion is fitted with a rudder arm, the rudder arm is provided with a fastening hole at the position corresponding to the threaded hole, a fastening screw is inserted through the fastening hole, and the fastening screw is threadedly connected to the threaded hole.

[0012] In a further technical solution, a PCB board is provided at the lower part of the motor cavity, the lower part of the drive motor is connected to the PCB board, and a wire hole is provided at the lower part of the housing. The wire hole is located below the PCB board and is fitted with a waterproof sleeve.

[0013] In a further technical solution, an inwardly recessed clearance recess is provided on one side of the lower part of the housing, one side of the PCB board abuts against the clearance recess, a limit groove is provided on the upper part of the clearance recess, and one side of the drive motor is embedded in the limit groove.

[0014] The advantages of this utility model compared with the prior art after adopting the above structure are: the drive motor and the gear set are physically isolated by the gear cavity and the motor cavity, which avoids the drive motor from encroaching on the installation space of the gear set, improves the installation and layout space of the gear set, and enables the use of gear sets with multi-stage gear ratios, thereby improving gear strength and transmission efficiency and increasing the torque output of the servo motor.

[0015] The transmission is achieved through a five-stage gear meshing structure and a stepped arrangement of double gears, which can make full use of the gear cavity and achieve a high reduction ratio transmission within a limited space. The differentiated design of the outer diameter of each gear further optimizes the transmission path, ensuring high torque output while reducing stress concentration between gears and extending gear life.

[0016] The centered layout of the drive motor and the symmetrical arrangement of the gear set can improve the overall center of gravity distribution of the servo, keeping the center of gravity of the servo in the center and avoiding vibration caused by centrifugal force shift due to the weight of the drive motor. The damping ring absorbs high-frequency vibration and suppresses resonance. Through structural optimization, the center of gravity is self-balanced, eliminating the need for additional counterweights and reducing material costs and assembly complexity. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is an exploded view of the present invention;

[0020] Figure 3This is a cross-sectional view of the present invention.

[0021] In the picture:

[0022] 1. Housing, 11. Top cover, 12. Middle housing, 121. Gear cavity, 122. Isolation plate, 123. Detection hole, 124. Mounting hole, 125. First shaft, 126. Second shaft, 13. Lower housing, 131. Motor cavity, 132. Avoidance recess, 133. Limiting groove, 14. Waterproof sleeve;

[0023] 2 drive motors;

[0024] 3 potentiometers;

[0025] 4 gear set, 41 first gear, 42 second gear, 43 third gear, 44 fourth gear, 45 fifth gear, 46 drive gear;

[0026] 5 Output shaft, 51 Spline section, 52 Transmission section, 53 Connecting section, 54 Detection section, 55 Detection flat shaft, 56 Bearing, 57 Damping ring, 58 Snap ring, 59 Threaded hole;

[0027] 6 rudder arms, 61 fastening holes, 62 fastening screws;

[0028] 7. PCB board. Detailed Implementation

[0029] The following are merely preferred embodiments of the present invention and do not limit the scope of protection of the present invention.

[0030] A servo gear arrangement structure, such as Figures 1 to 3As shown, the device includes a housing 1 and a drive motor 2, a potentiometer 3, a gear set 4, and an output shaft 5 installed inside the housing 1. The drive motor 2 is connected to the gear set 4, the gear set 4 is connected to the output shaft 5, and the output shaft 5 is connected to the potentiometer 3. The housing 1 has a gear cavity 121 and a motor cavity 131 that are arranged vertically and vertically. The drive motor 2 and the potentiometer 3 are respectively disposed in the motor cavity 131, the gear set 4 is disposed in the gear cavity 121, and the drive motor 2 is located in the middle of the motor cavity 131. There is an installation gap between the drive motor 2 and the inner wall of the motor cavity 131. Traditional servo gear arrangement structures place the drive motor 2 next to the gear set 4, making the drive motor 2 and gear set 4 side by side. This results in the servo's center of gravity being on one side of the drive motor 2, rather than in the center. In applications requiring high balance, additional counterweights are needed to adjust the center of gravity, leading to a complex structure and high cost. Furthermore, the drive motor 2 encroaches on the installation space of the gear set 4, increasing the servo's size or compressing the mounting components of the gear set 4, resulting in a low gear ratio, small gear size, low structural strength, and poor reliability and stability. This invention, however, utilizes a gear cavity 121 and an electric... The cavity 131 physically isolates the drive motor 2 and the gear set 4, preventing the drive motor 2 from encroaching on the installation space of the gear set 4, increasing the installation and layout space of the gear set 4, and enabling the use of a multi-stage gear ratio gear set 4, thereby improving gear strength and transmission efficiency, and increasing the torque output of the servo motor. The centrally located drive motor 2 and the symmetrical arrangement of the gear set 4 can improve the overall center of gravity distribution of the servo motor, keeping the center of gravity of the servo motor in the center, avoiding vibration caused by centrifugal force shift due to the weight of the drive motor 2. Through structural optimization, the center of gravity is self-balanced, eliminating the need for additional counterweights, reducing material costs and assembly complexity.

[0031] Specifically, gear set 4 includes a first gear 41, a second gear 42, a third gear 43, a fourth gear 44, a fifth gear 45, and a drive gear 46. The main shaft of the drive motor 2 extends upward into the gear cavity 121. The drive gear 46 is fixedly mounted on the main shaft of the drive motor 2. The first gear 41 and the output shaft 5 are respectively located on both sides of the drive gear 46. The second gear 42 is located above the drive gear 46, the third gear 43 is located above the first gear 41, the fourth gear 44 is located above the second gear 42, and the fifth gear 45 is fixedly mounted on the output shaft 5. The drive gear 46 meshes with the first gear 41, the first gear 41 meshes with the second gear 42, the second gear 42 meshes with the third gear 43, the third gear 43 meshes with the fourth gear 44, and the fourth gear 44 meshes with the fifth gear 45. The first gear 41, the second gear 42, the third gear 43, the fourth gear 44, the fifth gear 45, and the drive gear 46 form a five-stage gear meshing structure, which improves the reduction ratio and amplifies the output torque of the drive motor 2, making it particularly suitable for high-load scenarios such as robot joints. Gear set 4 and output shaft 5 are positioned on opposite sides, and the staggered gear arrangement achieves symmetrical balance in the torque transmission path, reducing stress concentration on one side and extending the life of gear set 4. Gear set 4 is arranged longitudinally rather than laterally, thereby reducing the overall size of the servo motor, facilitating integration into space-constrained devices and expanding its application range.

[0032] Specifically, a first shaft 125 and a second shaft 126 are vertically arranged inside the gear cavity 121. The second shaft 126 is located above the drive motor 2, and the first shaft 125 is located beside the second shaft 126. The first gear 41 and the third gear 43 are rotatably mounted on the first shaft 125, and the second gear 42 and the fourth gear 44 are rotatably mounted on the second shaft 126. The first gear 41, the second gear 42, the third gear 43, and the fourth gear 44 are all double gears. The drive gear 46 meshes with the large gear of the first gear 41, the small gear of the first gear 41 meshes with the large gear of the second gear 42, the small gear of the second gear 42 meshes with the large gear of the third gear 43, the small gear of the third gear 43 meshes with the large gear of the fourth gear 44, and the small gear of the fourth gear 44 meshes with the fifth gear 45. Through the stepped meshing of the double gears, the large gear transmits power, the small gear changes the transmission direction, the single-tooth load is distributed, and the tooth surface wear rate is reduced. The four gears, namely the first gear 41, the second gear 42, the third gear 43, and the fourth gear 44, are fixed by two rods, the first shaft 125 and the second shaft 126, forming a symmetrical layout, which further improves the uniformity of the overall center of gravity distribution of the servo motor; the longitudinal stacking arrangement of the gear set 4 further compresses the lateral space and improves the structural compactness; the staggered meshing of the double gears reduces transmission impact and reduces the transmission of high-frequency vibration energy, making it suitable for frequent start-stop scenarios.

[0033] Specifically, the outer diameter of the large gear of the first gear 41 is smaller than that of the large gear of the second gear 42; the outer diameter of the large gear of the second gear 42 is larger than that of the large gear of the third gear 43; the outer diameter of the large gear of the third gear 43 is the same as that of the large gear of the fourth gear 44; the outer diameter of the large gear of the fourth gear 44 is smaller than that of the fifth gear 45; the outer diameter of the small gear of the first gear 41 is smaller than that of the small gear of the second gear 42; the outer diameter of the small gear of the second gear 42 is equal to that of the small gear of the third gear 43; the outer diameter of the small gear of the third gear 43 is smaller than that of the small gear of the fourth gear 44; and the outer diameter of the small gear of the fourth gear 44 is smaller than that of the fifth gear 45. By precisely controlling the reduction ratio of each gear stage through the differences in the outer diameters of each gear, a smooth, step-by-step torque amplification is achieved, avoiding sudden changes in gear stress caused by excessively large single-stage reduction ratios. The matching design of the outer diameter and the number of teeth reduces backlash collisions during gear meshing, reducing operating noise. The differentiated design of the outer diameters of each gear further optimizes the transmission path, ensuring high torque output while reducing stress concentration between gears and extending gear life.

[0034] Specifically, the housing 1 includes an upper cover 11, a middle shell 12, and a lower shell 13. The upper cover 11 is fastened to the upper part of the middle shell 12, and the lower shell 13 is fastened to the lower part of the middle shell 12. An isolation plate 122 is provided inside the middle shell 12. A gear cavity 121 is formed between the isolation plate 122 and the upper cover 11, and a motor cavity 131 is formed between the isolation plate 122 and the lower shell 13. A detection hole 123 and a mounting hole 124 are provided in the middle of the isolation plate 122. The potentiometer 3 is snapped into the detection hole 123, and the main shaft of the drive motor 2 passes upward through the mounting hole 124. The gear cavity 121 and the motor cavity 131 are separated by the isolation plate 122, and the main shaft of the drive motor 2 passes through the mounting hole 124 and is inserted into the motor cavity 131, so that all the transmission structure is located in the gear cavity 121, so as to prevent the lubricating oil of the gear cavity 121 from entering the motor cavity 131, thereby preventing the lubricating oil from contaminating the drive motor 2 and the PCB board 7. The split housing 1 allows for independent installation and debugging of the gear set 4, the drive motor 2 and the potentiometer 3, improving production efficiency and yield. Damaged parts can be replaced by disassembling only a single cavity. When repairing the gear set, only the upper cover 11 needs to be opened, and when repairing the drive motor 2, only the lower housing 13 needs to be opened, reducing after-sales costs.

[0035] Specifically, the output shaft 5 is provided with a splined section 51, a transmission section 52, a connecting section 53, and a detection section 54 from top to bottom. The outer side of the splined section 51 is provided with a spline groove. The fifth gear 45 is sleeved on the transmission section 52. The lower part of the detection section 54 is provided with a detection flat shaft 55, which passes through the detection hole 123 and is connected to the potentiometer 3. The lower parts of the detection section 54 and the splined section 51 are respectively provided with bearings 56. By directly connecting the detection flat shaft 55 to the potentiometer 3, the transmission error introduced by the traditional coupling is eliminated, and the angle control accuracy is improved. The bearings 56 support and reduce the rotational resistance of the output shaft 5, avoiding wear caused by direct friction between the output shaft 5 and the housing 1, which is suitable for high-frequency oscillation scenarios. The splined section is rigidly connected to the rudder arm 6, which improves the connection strength, ensures no delay in power transmission, and improves the response speed.

[0036] Specifically, the outer diameters of the spline portion 51 and the connecting portion 53 are both larger than the outer diameter of the transmission portion 52. A damping ring 57 is provided between the fifth gear 45 and the transmission portion 52. At least one retaining ring 58 is engaged with the transmission portion 52, and the retaining ring 58 abuts against one side of the damping ring 57. The damping ring 57 absorbs the meshing impact of the gear set 4 and the instantaneous load of the output shaft 5 through elastic deformation, which can suppress the transmission of high-frequency vibration to the housing 1 and reduce vibration. The retaining ring 58 locks the position of the damping ring 57 to avoid component displacement caused by long-term vibration and ensure transmission stability. The damping ring 57 can buffer the impact of extreme loads on the gear set 4, prevent the gear set 4 from breaking teeth, reduce gear wear, and achieve load protection. It is suitable for robot joint sudden external force scenarios.

[0037] Specifically, the center of the splined portion 51 is provided with a threaded hole 59 facing the open direction. The splined portion 51 is fitted with a rudder arm 6. The rudder arm 6 has a fastening hole 61 corresponding to the position of the threaded hole 59. A fastening screw 62 passes through the fastening hole 61 and is threadedly connected to the threaded hole 59. The fastening screw 62 eliminates the spline fit clearance between the rudder arm 6 and the output shaft 5 by fastening, further improving the connection strength, preventing the keyway connection from loosening, and ensuring absolutely precise angle control. The screw connection makes it easy to replace or adjust the installation angle of the rudder arm 6 to adapt to the interface requirements of different equipment.

[0038] Specifically, a PCB board 7 is provided at the lower part of the motor cavity 131, and the lower part of the drive motor 2 is connected to the PCB board 7. A wiring hole is provided at the lower part of the housing 1, located below the PCB board 7, and a waterproof sleeve 14 is embedded in the wiring hole. The waterproof sleeve 14 seals the cable interface to prevent external liquids or dust from entering the motor cavity 131, improving the reliability of the servo in humid and dusty environments. The drive circuit is centrally arranged on the PCB board 7, shortening the distance between the wires and the drive motor 2, reducing signal transmission loss and electromagnetic radiation.

[0039] Specifically, a recessed clearance recess 132 is provided on one side of the lower part of the housing 1. One side of the PCB board 7 abuts against the clearance recess 132. A limiting groove 133 is provided on the upper part of the clearance recess 132, and one side of the drive motor 2 is embedded in the limiting groove 133. The limiting groove 133 provides three-dimensional fixation for the PCB board 7 and the drive motor 2, preventing components from loosening due to high-frequency vibration. The clearance recess provides a positioning reference for the installation of the PCB board 7 and the servo motor, improving installation efficiency.

[0040] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A servo gear arrangement structure, comprising a housing (1) and a drive motor (2), a potentiometer (3), a gear set (4), and an output shaft (5) installed within the housing (1), wherein the drive motor (2) is drivenly connected to the gear set (4), the gear set (4) is drivenly connected to the output shaft (5), and the output shaft (5) is connected to the potentiometer (3), characterized in that: The housing (1) has an internal gear cavity (121) and a motor cavity (131) arranged in an overlapping manner. The drive motor (2) and the potentiometer (3) are respectively disposed in the motor cavity (131). The gear set (4) is disposed in the gear cavity (121). The drive motor (2) is located in the middle of the motor cavity (131). There is an installation gap between the drive motor (2) and the inner wall of the motor cavity (131).

2. The servo gear arrangement structure according to claim 1, characterized in that: The gear set (4) includes a first gear (41), a second gear (42), a third gear (43), a fourth gear (44), a fifth gear (45), and a drive gear (46). The main shaft of the drive motor (2) extends upward into the gear cavity (121). The drive gear (46) is fixedly mounted on the main shaft of the drive motor (2). The first gear (41) and the output shaft (5) are respectively located on both sides of the drive gear (46). The second gear (42) is located on the drive gear (46). Above, the third gear (43) is located above the first gear (41), the fourth gear (44) is located above the second gear (42), and the fifth gear (45) is fixedly installed on the output shaft (5). The drive gear (46) meshes with the first gear (41), the first gear (41) meshes with the second gear (42), the second gear (42) meshes with the third gear (43), the third gear (43) meshes with the fourth gear (44), and the fourth gear (44) meshes with the fifth gear (45).

3. The servo gear arrangement structure according to claim 2, characterized in that: A first shaft (125) and a second shaft (126) are vertically arranged inside the gear cavity (121). The second shaft (126) is located above the drive motor (2), and the first shaft (125) is located beside the second shaft (126). The first gear (41) and the third gear (43) are rotatably mounted on the first shaft (125), and the second gear (42) and the fourth gear (44) are rotatably mounted on the second shaft (126). The second gear (42), the third gear (43), and the fourth gear (44) are all double gears. The driving gear (46) meshes with the large gear of the first gear (41), the small gear of the first gear (41) meshes with the large gear of the second gear (42), the small gear of the second gear (42) meshes with the large gear of the third gear (43), the small gear of the third gear (43) meshes with the large gear of the fourth gear (44), and the small gear of the fourth gear (44) meshes with the fifth gear (45).

4. The servo gear arrangement structure according to claim 3, characterized in that: The outer diameter of the large gear of the first gear (41) is smaller than that of the large gear of the second gear (42). The outer diameter of the large gear of the second gear (42) is larger than that of the large gear of the third gear (43). The outer diameter of the large gear of the third gear (43) is the same as that of the large gear of the fourth gear (44). The outer diameter of the large gear of the fourth gear (44) is smaller than that of the fifth gear (45). The outer diameter of the small gear of the first gear (41) is smaller than that of the small gear of the second gear (42). The outer diameter of the small gear of the second gear (42) is equal to that of the small gear of the third gear (43). The outer diameter of the small gear of the third gear (43) is smaller than that of the small gear of the fourth gear (44). The outer diameter of the small gear of the fourth gear (44) is smaller than that of the fifth gear (45).

5. The servo gear arrangement structure according to claim 2, characterized in that: The housing (1) includes an upper cover (11), a middle shell (12) and a lower shell (13). The upper cover (11) is fastened to the upper part of the middle shell (12), and the lower shell (13) is fastened to the lower part of the middle shell (12). An isolation plate (122) is provided inside the middle shell (12). The gear cavity (121) is formed between the isolation plate (122) and the upper cover (11), and the motor cavity (131) is formed between the isolation plate (122) and the lower shell (13). A detection hole (123) and a mounting hole (124) are provided in the middle of the isolation plate (122). The potentiometer (3) is snapped into the detection hole (123), and the main shaft of the drive motor (2) passes upward through the mounting hole (124).

6. The servo gear arrangement structure according to claim 5, characterized in that: The output shaft (5) is provided with a splined part (51), a transmission part (52), a connecting part (53) and a detection part (54) from top to bottom. The outer side of the splined part (51) is provided with a spline groove. The fifth gear (45) is sleeved on the transmission part (52). The lower part of the detection part (54) is provided with a detection flat shaft (55). The detection flat shaft (55) passes through the detection hole (123) and is connected to the potentiometer (3). The lower parts of the detection part (54) and the splined part (51) are respectively provided with bearings (56).

7. The servo gear arrangement structure according to claim 6, characterized in that: The outer diameter of the spline portion (51) and the outer diameter of the connecting portion (53) are both larger than the outer diameter of the transmission portion (52). A damping ring (57) is provided between the fifth gear (45) and the transmission portion (52). The transmission portion (52) is engaged with at least one snap ring (58), and the snap ring (58) abuts against one side of the damping ring (57).

8. The servo gear arrangement structure according to claim 6, characterized in that: The center of the spline part (51) is provided with a threaded hole (59) facing the opening direction. The spline part (51) is fitted with a rudder arm (6). The rudder arm (6) is provided with a fastening hole (61) at the position corresponding to the threaded hole (59). A fastening screw (62) passes through the fastening hole (61) and is threadedly connected to the threaded hole (59).

9. The servo gear arrangement structure according to claim 1, characterized in that: The lower part of the motor cavity (131) is provided with a PCB board (7), the lower part of the drive motor (2) is connected to the PCB board (7), the lower part of the housing (1) is provided with a wire hole, the wire hole is located below the PCB board (7), and a waterproof sleeve (14) is embedded in the wire hole.

10. A servo gear arrangement structure according to claim 9, characterized in that: The lower part of the housing (1) is provided with an inwardly recessed relief recess (132) on one side, the PCB board (7) abuts against the relief recess (132) on one side, the relief recess (132) is provided with a limiting groove (133) on the upper part, and the drive motor (2) is embedded in the limiting groove (133) on one side.

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