A servo motor detection shaft

Abstract

This utility model discloses a servo motor detection shaft. The detection output mechanism includes a detection shaft, a gear shaft, and an output gear. The detection shaft has an upper positioning flat shaft and a lower positioning flat shaft at both ends. The upper positioning flat shaft is connected to the gear shaft, and the lower positioning flat shaft is connected to a potentiometer. The gear shaft has external splines, and a positioning groove is provided between any two adjacent external splines. The servo motor has internal splines, and a positioning key is provided at the position of the internal spline corresponding to the positioning groove. The gear shaft is inserted into a positioning connection hole, and the positioning key is inserted into the positioning groove. The output gear is sleeved on the gear shaft. The motor drives the output gear via a reduction gear set. The servo motor and gear shaft are connected by a spline structure, which improves the connection strength and enhances the load-bearing capacity. Furthermore, the positioning groove and positioning key allow for positioning during assembly, eliminating the need for manual calibration and improving assembly efficiency. The detection shaft does not need to bear large torque; its connection to the potentiometer and gear shaft via the flat shaft structure results in a simple structure and low cost.

Description

Technical Field

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

[0002] A servo motor is a position (angle) servo drive suitable for control systems that require continuous angle changes and maintenance. Traditional servo motors use a flat shaft at one end of the sensing shaft to connect to a potentiometer, while a splined shaft is often used at the other end to connect to the servo disc. To ensure connection strength and improve load-bearing capacity, an output gear is fitted in the middle of the sensing shaft to connect to a reduction gear set for transmission. The sensing shaft is a single-piece structure, complex and costly to manufacture. At the factory, the sensing shaft is often positioned in the middle, requiring the servo disc's mounting angle to be physically aligned with the output shaft's. Failure to achieve this alignment will cause the servo disc to deviate from the expected angle, resulting in a mismatch between the actual range of motion and the control signal, affecting control accuracy. However, using a splined shaft to connect to the servo disc doesn't allow for quick positioning between the sensing shaft and the servo disc, necessitating manual calibration and alignment during assembly. This is complex and inefficient, thus requiring improvement. Utility Model Content

[0003] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a servo motor detection shaft that simplifies the structure, reduces costs, enables quick positioning and installation of the servo disc, eliminates the need for manual calibration, and improves assembly efficiency.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a servo motor detection shaft, comprising a housing, a potentiometer, a motor, a reduction gear set, a detection output mechanism, and a servo disc. The motor, reduction gear set, and detection output mechanism are respectively disposed within the housing. The motor is driven by the reduction gear set, and the reduction gear set is driven by the detection output mechanism. One end of the detection output mechanism is connected to the potentiometer, and the other end is connected to the servo disc. The detection output mechanism includes a detection shaft, a gear shaft, and an output gear. An upper positioning flat shaft is provided at the upper end of the detection shaft, and the lower end of the detection shaft... A lower positioning flat shaft is provided, which is connected to a potentiometer. An external spline is provided on the outer wall of the upper part of the gear shaft. A keyway hole is opened at the lower part of the gear shaft, and the upper positioning flat shaft is inserted into the keyway hole. A positioning groove is provided between any two adjacent external splines. A positioning connection hole with an opening facing downward is opened at the lower part of the rudder disk. An internal spline is provided on the inner wall of the positioning connection hole. A positioning key with an outward protrusion is provided on the inner wall of the positioning connection hole corresponding to the position of the positioning groove. The upper part of the gear shaft is inserted into the positioning connection hole, the positioning key is inserted into the positioning groove, and the output gear is sleeved on the gear shaft.

[0005] In a further technical solution, the gear shaft includes a connecting disc and a connecting rod. The connecting disc is formed in the middle of the connecting rod. The external spline and positioning groove are both set on the upper part of the connecting rod and located above the connecting disc. The keyway hole is set at the lower end of the connecting rod. The outer sidewall of the connecting disc is provided with multiple arc-shaped protrusions at intervals along the circumferential direction. The upper end face of the output gear is provided with a connecting groove. The inner sidewall of the connecting groove is provided with multiple arc-shaped grooves at intervals along the circumferential direction that correspond one-to-one with each arc-shaped protrusion. The center of the bottom of the connecting groove is provided with a through hole that passes through the output gear. The lower part of the connecting rod passes through the through hole. The connecting disc is embedded in the connecting groove. Each arc-shaped protrusion is embedded in each arc-shaped groove.

[0006] In a further technical solution, a fastening hole with an opening facing the center of the rudder disk is provided. The lower end of the fastening hole is connected to the positioning connection hole. The upper end of the connecting rod is provided with a threaded hole with an opening facing the center. A fastening screw is inserted into the fastening hole. The fastening screw passes through the positioning connection hole and is threadedly connected to the threaded hole.

[0007] In a further technical solution, a superscript line is provided on the outer side of the rudder, and a subscript line is provided on the side of the outer casing corresponding to the superscript line, with the superscript line and the subscript line aligned.

[0008] In a further technical solution, the outer cylindrical surfaces of both the upper and lower positioning flat shafts are symmetrically provided with positioning planes, forming a double-plane flat shaft.

[0009] In a further technical solution, the reduction gear set includes a first transmission rod, a second transmission rod, a first transmission gear, a second transmission gear, a third transmission gear, and a fourth transmission gear. A motor gear is provided at the output end of the motor. The first transmission rod is positioned between the motor and the detection output mechanism. The first transmission gear is rotatably mounted on the first transmission rod. The second transmission rod is positioned between the first transmission rod and the detection output mechanism. The second transmission gear is rotatably mounted on the lower part of the second transmission rod, and the first transmission gear meshes with the second transmission gear. The third transmission gear is rotatably mounted on the middle part of the detection shaft, and the second transmission gear meshes with the third transmission gear. The fourth transmission gear is rotatably mounted on the upper part of the second transmission rod, and the third transmission gear meshes with the fourth transmission gear. The fourth transmission gear meshes with the output gear.

[0010] In a further technical solution, the first transmission gear, the second transmission gear, the third transmission gear, and the fourth transmission gear are all double gears. The large gear of the first transmission gear meshes with the motor gear, the small gear of the first transmission gear meshes with the large gear of the second transmission gear, the small gear of the second transmission gear meshes with the large gear of the third transmission gear, the small gear of the third transmission gear meshes with the large gear of the fourth transmission gear, and the small gear of the fourth transmission gear meshes with the output gear.

[0011] In a further technical solution, the outer shell includes an upper cover, a middle shell, and a lower cover. The upper cover is located on the upper end face of the middle shell, and the lower cover is located on the lower end face of the middle shell. The middle shell has a transmission mounting groove, a detection mounting groove, and a drive mounting groove inside. The transmission mounting groove is located above the detection mounting groove, and the drive mounting groove is located beside the transmission mounting groove and the detection mounting groove. The reduction gear set and the detection output mechanism are both located in the transmission mounting groove. A fixing slot is provided at the upper part of the detection mounting groove. A fixing buckle is provided at the position of the fixing slot corresponding to the fixing slot. The fixing buckle engages with the corresponding fixing buckle. The motor is located in the drive mounting groove. A drive hole communicating with the transmission mounting groove is provided at the upper part of the drive mounting groove. The output end of the motor passes through the drive hole and is connected to the reduction gear set for transmission.

[0012] In a further technical solution, a circuit board is provided on the lower end face of the lower cover, and the motor and potentiometer are electrically connected to the circuit board respectively.

[0013] In a further technical solution, the lower cover includes a drive ring, a transmission ring, and a connecting block. The lower parts of both sides of the connecting block are formed on the upper parts of the drive ring and the transmission ring, respectively. The drive ring is located below the drive mounting groove. The lower part of the motor is embedded in the drive ring. The transmission ring is located below the detection mounting groove. The drive ring, the transmission ring, and the connecting block enclose a socket groove. A connection socket is provided on the upper end face of the circuit board. The connection socket is embedded in the socket groove.

[0014] The advantages of this invention compared to existing technologies are as follows: The servo disc and the detection shaft are connected via a gear shaft. The motor drives the output gear through a reduction gear set, which in turn drives the gear shaft to rotate. The servo disc and the gear shaft are connected via a spline structure, which improves connection strength and enhances load-bearing capacity. Furthermore, positioning is achieved during assembly via positioning grooves and keys, eliminating the need for manual alignment and improving assembly efficiency. The potentiometer is connected to the gear shaft via the detection shaft. Since the detection shaft does not need to bear a large torque, both ends of the detection shaft are connected to the potentiometer and gear shaft via flat shaft structures, resulting in a simple structure that is easy to manufacture and reduces costs. The gear shaft and the output gear are connected via an arc-shaped groove and an arc-shaped protrusion, thereby reducing the amount of sliding deformation between the gear shaft and the output gear when the servo is overloaded, preventing damage to the reduction gear set and the output gear during overload, and extending their service life. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is an exploded view of the present invention;

[0018] Figure 3This is a cross-sectional view of the present invention;

[0019] Figure 4 This is an exploded view of the output component of this utility model;

[0020] Figure 5 This is a schematic diagram of the rudder disc of this utility model.

[0021] In the picture:

[0022] 11 Top cover, 12 Middle shell, 121 Transmission mounting slot, 122 Detection mounting slot, 123 Drive mounting slot, 124 Drive hole, 13 Bottom cover, 131 Drive ring, 132 Transmission ring, 133 Connecting block, 134 Socket slot, 14 Subscript line;

[0023] 2 detection shaft, 21 upper positioning flat shaft, 22 lower positioning flat shaft;

[0024] 3 Gear shaft, 31 Connecting disc, 311 Arc-shaped protrusion, 32 Connecting rod, 321 External spline, 322 Positioning groove, 323 Keyway hole, 324 Threaded hole;

[0025] 4 Output gear, 41 Connecting groove, 42 Arc-shaped groove, 43 Through hole;

[0026] 5. Reduction gear set; 51. First transmission rod; 52. Second transmission rod; 53. First transmission gear; 54. Second transmission gear; 55. Third transmission gear; 56. Fourth transmission gear.

[0027] 6 potentiometers, 61 retaining clips;

[0028] 7 motors, 71 motor gears;

[0029] 8. Steering disc, 81. Positioning connection hole, 82. Internal spline, 83. Positioning key, 84. Fastening hole, 85. Top marker line;

[0030] 9. Circuit board, 91. Connecting socket. Detailed Implementation

[0031] The following are merely preferred embodiments of the present invention and do not limit the scope of protection of the present invention.

[0032] A servo motor detection axis, such as Figures 1 to 5As shown, the device includes a housing, a potentiometer 6, a motor 7, a reduction gear set 5, a detection output mechanism, and a rudder disk 8. The motor 7, reduction gear set 5, and detection output mechanism are respectively housed within the housing. The motor 7 is driven by the reduction gear set 5, which is also driven by the detection output mechanism. One end of the detection output mechanism is connected to the potentiometer 6, and the other end is connected to the rudder disk 8. The detection output mechanism includes a detection shaft 2, a gear shaft 3, and an output gear 4. An upper positioning flat shaft 21 is provided at the upper end of the detection shaft 2, and a lower positioning flat shaft 22 is provided at the lower end of the detection shaft 2. The lower positioning flat shaft 22 is connected to the potentiometer 6. The gear shaft... The upper outer wall of the gear shaft 3 is provided with an external spline 321. The lower part of the gear shaft 3 is provided with a keyway hole 323. The upper positioning flat shaft 21 is inserted into the keyway hole 323. A positioning groove 322 is provided between any two adjacent external splines 321. The lower part of the rudder disk 8 is provided with a downward-facing positioning connection hole 81. The inner wall of the positioning connection hole 81 is provided with an internal spline 82. The inner wall of the positioning connection hole 81 is provided with an outwardly protruding positioning key 83 corresponding to the position of the positioning groove 322. The upper part of the gear shaft 3 is inserted into the positioning connection hole 81, the positioning key 83 is inserted into the positioning groove 322, and the output gear 4 is sleeved on the gear shaft 3.

[0033] Traditional servo motors have a single-piece output shaft, with one end being a splined shaft for connecting the servo disc 8 and the other end a flat shaft for connecting the potentiometer 6. The output gear 4 is molded onto the output shaft, resulting in a complex structure, high manufacturing costs, and requiring manual alignment and positioning of the output shaft and servo disc 8 during assembly, leading to low assembly efficiency. In contrast, this invention connects the servo disc 8 and the detection shaft 2 via a gear shaft 3. The motor 7 drives the output gear 4 through a reduction gear set 5, which in turn drives the gear shaft 3 to rotate. The servo disc 8 and the gear shaft 3 are connected via a spline structure, which improves connection strength and enhances load-bearing capacity. Furthermore, positioning is achieved during assembly using a positioning groove 322 and a positioning key 83, eliminating the need for manual alignment and improving assembly efficiency. The potentiometer 6 is connected to the gear shaft 3 via the detection shaft 2. Since the detection shaft 2 does not need to bear a large torque, both ends of the detection shaft 2 are connected to the potentiometer 6 and the gear shaft 3 via flat shaft structures, resulting in a simple structure that is easy to manufacture and reduces costs.

[0034] Specifically, the gear shaft 3 includes a connecting disc 31 and a connecting rod 32. The connecting disc 31 is formed in the middle of the connecting rod 32. The external spline 321 and the positioning groove 322 are both set on the upper part of the connecting rod 32 and located above the connecting disc 31. The keyway hole 323 is set at the lower end of the connecting rod 32. The outer sidewall of the connecting disc 31 is provided with a plurality of arc-shaped protrusions 311 at intervals along the circumferential direction. The upper end face of the output gear 4 is provided with a connecting groove 41. The inner sidewall of the connecting groove 41 is provided with a plurality of arc-shaped grooves 42 at intervals along the circumferential direction, which correspond one-to-one with each arc-shaped protrusion 311. The center of the bottom of the connecting groove 41 is provided with a through hole 43 that passes through the output gear 4. The lower part of the connecting rod 32 passes through the through hole 43. The connecting disc 31 is embedded in the connecting groove 41, and each arc-shaped protrusion 311 is embedded in each arc-shaped groove 42. In traditional servo motors, the output gear 4 is molded onto the output shaft. When the servo motor is overloaded, the stress cannot be offset, which will wear down the output gear 4 and the reduction gear set 5, causing missing teeth and a high failure rate. In contrast, the gear shaft 3 and the output gear 4 of this invention are connected by an arc-shaped groove 42 and an arc-shaped protrusion 311 to form a clutch structure. This also reduces the amount of sliding deformation between the gear shaft 3 and the output gear 4 when the servo motor is overloaded, thereby reducing the stress generated during overload, preventing damage to the reduction gear set 5 and the output gear 4 during overload, and extending their service life.

[0035] Specifically, the center of the rudder disk 8 has a fastening hole 84 with an opening facing upwards. The lower end of the fastening hole 84 communicates with the positioning connection hole 81. The upper end of the connecting rod 32 has a threaded hole 324 with an opening facing upwards. A fastening screw is inserted into the fastening hole 84, and the fastening screw passes through the positioning connection hole 81 and is threaded into the threaded hole 324. The fastening screw further connects the rudder disk 8 and the gear shaft 3, improving the connection strength and further increasing the load capacity.

[0036] Specifically, the outer surface of the steering wheel 8 is provided with a superscript line 85, and the outer casing is provided with a subscript line 14 on the side corresponding to the superscript line. The superscript line 85 and the subscript line 14 are aligned. The superscript line 85 and the subscript line 14 can be pre-aligned during assembly so that the positioning groove 322 and the positioning key 83 are aligned, further improving assembly efficiency.

[0037] Specifically, both the upper positioning flat shaft 21 and the lower positioning flat shaft 22 have symmetrically arranged positioning planes on their outer cylindrical surfaces, forming a double-plane flat shaft. Since both the upper positioning flat shaft 21 and the lower positioning flat shaft 22 are double-plane flat shafts, there is no need to position the detection shaft 2, further improving assembly efficiency.

[0038] Specifically, the reduction gear set 5 includes a first transmission rod 51, a second transmission rod 52, a first transmission gear 53, a second transmission gear 54, a third transmission gear 55, and a fourth transmission gear 56. A motor gear 71 is provided at the output end of the motor 7. The first transmission rod 51 is located between the motor 7 and the detection output mechanism. The first transmission gear 53 is rotatably mounted on the first transmission rod 51. The second transmission rod 52 is located between the first transmission rod 51 and the detection output mechanism. The second transmission gear 54 is rotatably mounted on the lower part of the second transmission rod 52, and the first transmission gear 53 meshes with the second transmission gear 54. The third transmission gear 55 is rotatably mounted on the middle part of the detection shaft 2, and the second transmission gear 54 meshes with the third transmission gear 55. The fourth transmission gear 56 is rotatably mounted on the upper part of the second transmission rod 52, and the third transmission gear 55 meshes with the fourth transmission gear 56. The fourth transmission gear 56 meshes with the output gear 4. The third transmission gear 55 is rotatably mounted on the detection shaft 2 to make full use of the installation space, simplify the structure, reduce costs, and reduce volume. The first transmission gear 53, the second transmission gear 54, the third transmission gear 55, the fourth transmission gear 56, and the output gear 4 form a five-stage reduction, which increases the gear ratio and further improves the load capacity.

[0039] Specifically, the first transmission gear 53, the second transmission gear 54, the third transmission gear 55, and the fourth transmission gear 56 are all double gears. The large gear of the first transmission gear 53 meshes with the motor gear 71, the small gear of the first transmission gear 53 meshes with the large gear of the second transmission gear 54, the small gear of the second transmission gear 54 meshes with the large gear of the third transmission gear 55, the small gear of the third transmission gear 55 meshes with the large gear of the fourth transmission gear 56, and the small gear of the fourth transmission gear 56 meshes with the output gear 4. The double gear configuration simplifies the mechanism, reduces costs, and facilitates assembly.

[0040] Specifically, the outer shell includes an upper cover 11, a middle shell 12, and a lower cover 13. The upper cover 11 is located on the upper end face of the middle shell 12, and the lower cover 13 is located on the lower end face of the middle shell 12. The middle shell 12 has a transmission mounting groove 121, a detection mounting groove 122, and a drive mounting groove 123 inside. The transmission mounting groove 121 is located above the detection mounting groove 122, and the drive mounting groove 123 is located beside the transmission mounting groove 121 and the detection mounting groove 122. The reduction gear set 5 and the detection output mechanism are both located in the transmission mounting groove 121. The upper part of the detection mounting groove 122 has a fixing slot. The potentiometer 6 has a fixing buckle 61 at the position corresponding to the fixing slot. The fixing buckle 61 engages with the corresponding fixing buckle 61. The motor 7 is located in the drive mounting groove 123. The upper part of the drive mounting groove 123 has a drive hole 124 that communicates with the transmission mounting groove 121. The output end of the motor 7 passes through the drive hole 124 and is connected to the reduction gear set 5 for transmission. The upper cover 11, middle shell 12, and lower cover 13 are combined to form a split-type outer shell, which simplifies the production process and facilitates maintenance and replacement. At the same time, the reduction gear set 5, the detection output mechanism, the potentiometer 6, and the motor 7 are installed relatively independently through the transmission mounting slot 121, the detection mounting slot 122, and the drive mounting slot 123, which improves the installation strength and facilitates installation and maintenance. The potentiometer 6 is fixed to the fixing slot through the fixing buckle 61, which eliminates the need for connecting parts, improves installation efficiency, and further fixes the potentiometer 6, avoiding the low connection strength caused by simply soldering the pins to the circuit board 9, and preventing signal errors caused by vibration.

[0041] Specifically, a circuit board 9 is provided on the lower end face of the lower cover 13, and the motor 7 and potentiometer 6 are electrically connected to the circuit board 9. The circuit board 9 is located on the lower end face of the lower cover 13. The upper end of the motor 7 is the output terminal, and the lower end of the motor 7 is the connection terminal that is electrically connected to the circuit board 9. The connection terminal of the motor 7 is directly soldered to the circuit board 7 without the need for wire connection. Similarly, the potentiometer 6 is also located above the circuit board 9 and is directly soldered to the circuit board through its pins, also without the need for wire connection. Thus, the servo motor has no wire electrical connection, which improves connection reliability and shortens the circuit connection distance between the motor 7 and the potentiometer 6, reducing signal interference and improving control accuracy.

[0042] Specifically, the lower cover 13 includes a drive ring 131, a transmission ring 132, and a connecting block 133. The lower parts of both sides of the connecting block 133 are respectively formed on the upper parts of the drive ring 131 and the transmission ring 132. The drive ring 131 is located below the drive mounting groove 123. The lower part of the motor 7 is embedded in the drive ring 131. The transmission ring 132 is located below the detection mounting groove 122. The drive ring 131, the transmission ring 132, and the connecting block 133 enclose a socket groove 134. A connecting socket 91 is provided on the upper end face of the circuit board 9, and the connecting socket 91 is embedded in the socket groove 134. The lower cover 13 fixes the lower part of the motor 7 and increases the volume of the detection mounting groove 122, improving the installation stability of the motor 7 and the potentiometer 6. At the same time, the socket groove 134 accommodates the connecting socket 91, allowing the connecting socket 91 to be integrated into the interior of the servo motor, preventing the connecting socket 91 from protruding from the outer shell, and providing protection for the connecting socket 91 to prevent it from accidentally falling off.

[0043] 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 motor detection shaft, comprising a housing, a potentiometer (6), a motor (7), a reduction gear set (5), a detection output mechanism, and a servo disc (8), wherein the motor (7), the reduction gear set (5), and the detection output mechanism are respectively disposed within the housing; the motor (7) is drivenly connected to the reduction gear set (5); the reduction gear set (5) is drivenly connected to the detection output mechanism; one end of the detection output mechanism is connected to the potentiometer (6), and the other end is connected to the servo disc (8); characterized in that: The detection output mechanism includes a detection shaft (2), a gear shaft (3), and an output gear (4). An upper positioning flat shaft (21) is provided at the upper end of the detection shaft (2), and a lower positioning flat shaft (22) is provided at the lower end of the detection shaft (2). The lower positioning flat shaft (22) is connected to a potentiometer (6). An external spline (321) is provided on the outer side wall of the upper part of the gear shaft (3). A keyway hole (323) is opened at the lower part of the gear shaft (3). The upper positioning flat shaft (21) is inserted into the keyway hole (323). Any two adjacent external... A positioning groove (322) is provided between the splines (321). The lower part of the rudder disk (8) is provided with a positioning connection hole (81) with the opening facing downward. An internal spline (82) is provided on the inner wall of the positioning connection hole (81). A positioning key (83) protruding outward is provided on the inner wall of the positioning connection hole (81) corresponding to the position of the positioning groove (322). The upper part of the gear shaft (3) is inserted into the positioning connection hole (81), the positioning key (83) is inserted into the positioning groove (322), and the output gear (4) is sleeved on the gear shaft (3).

2. The servo motor detection shaft according to claim 1, characterized in that: The gear shaft (3) includes a connecting disc (31) and a connecting rod (32). The connecting disc (31) is formed in the middle of the connecting rod (32). The external spline (321) and the positioning groove (322) are both located on the upper part of the connecting rod (32) and above the connecting disc (31). The keyway hole (323) is located at the lower end of the connecting rod (32). The outer side wall of the connecting disc (31) is provided with a plurality of arc-shaped protrusions (311) spaced apart along the circumferential direction. The output gear (4) The upper end face is provided with a connecting groove (41). The inner side wall of the connecting groove (41) is provided with a plurality of arc-shaped grooves (42) that correspond one-to-one with each arc-shaped protrusion (311) along the circumferential direction. The center of the bottom of the connecting groove (41) is provided with a through hole (43) for passing through the output gear (4). The lower part of the connecting rod (32) passes through the through hole (43). The connecting plate (31) is embedded in the connecting groove (41), and each arc-shaped protrusion (311) is embedded in each arc-shaped groove (42).

3. A servo motor detection shaft according to claim 2, characterized in that: The center of the steering wheel (8) has a fastening hole (84) with the opening facing the center. The lower end of the fastening hole (84) is connected to the positioning connection hole (81). The upper end of the connecting rod (32) has a threaded hole (324) with the opening facing the center. A fastening screw is inserted into the fastening hole (84). The fastening screw passes through the positioning connection hole (81) and is threadedly connected to the threaded hole (324).

4. A servo motor detection shaft according to claim 1, characterized in that: The outer side of the steering wheel (8) is provided with a superscript line (85), and the outer shell is provided with a subscript line (14) on the side corresponding to the superscript line. The superscript line (85) and the subscript line (14) are aligned.

5. A servo motor detection shaft according to claim 1, characterized in that: The outer cylindrical surfaces of the upper positioning flat shaft (21) and the lower positioning flat shaft (22) are symmetrically provided with positioning planes, forming a double-plane flat shaft.

6. A servo motor detection shaft according to any one of claims 1 to 5, characterized in that: The reduction gear set (5) includes a first transmission rod (51), a second transmission rod (52), a first transmission gear (53), a second transmission gear (54), a third transmission gear (55), and a fourth transmission gear (56). A motor gear (71) is provided at the output end of the motor (7). The first transmission rod (51) is located between the motor (7) and the detection output mechanism. The first transmission gear (53) is rotatably mounted on the first transmission rod (51). The second transmission rod (52) is located between the first transmission rod (51) and the detection output mechanism. Between them, the second transmission gear (54) is rotatably mounted on the lower part of the second transmission rod (52), the first transmission gear (53) meshes with the second transmission gear (54), the third transmission gear (55) is rotatably mounted on the middle part of the detection shaft (2), the second transmission gear (54) meshes with the third transmission gear (55), the fourth transmission gear (56) is rotatably mounted on the upper part of the second transmission rod (52), the third transmission gear (55) meshes with the fourth transmission gear (56), and the fourth transmission gear (56) meshes with the output gear (4).

7. A servo motor detection shaft according to claim 6, characterized in that: The first transmission gear (53), the second transmission gear (54), the third transmission gear (55), and the fourth transmission gear (56) are all double gears. The large gear of the first transmission gear (53) meshes with the motor gear (71), the small gear of the first transmission gear (53) meshes with the large gear of the second transmission gear (54), the small gear of the second transmission gear (54) meshes with the large gear of the third transmission gear (55), the small gear of the third transmission gear (55) meshes with the large gear of the fourth transmission gear (56), and the small gear of the fourth transmission gear (56) meshes with the output gear (4).

8. A servo motor detection shaft according to claim 6, characterized in that: The outer casing includes an upper cover (11), a middle shell (12), and a lower cover (13). The upper cover (11) is disposed on the upper end face of the middle shell (12), and the lower cover (13) is disposed on the lower end face of the middle shell (12). The middle shell (12) has a transmission mounting groove (121), a detection mounting groove (122), and a drive mounting groove (123) inside. The transmission mounting groove (121) is located above the detection mounting groove (122), and the drive mounting groove (123) is located beside the transmission mounting groove (121) and the detection mounting groove (122). The reduction gear set (5) and the The detection output mechanism is set in the transmission mounting groove (121). The upper part of the detection mounting groove (122) is provided with a fixing slot. The potentiometer (6) is provided with a fixing buckle (61) at the position corresponding to the fixing slot. The fixing buckle (61) engages with the corresponding fixing buckle (61). The motor (7) is set in the drive mounting groove (123). The upper part of the drive mounting groove (123) is provided with a drive hole (124) that connects to the transmission mounting groove (121). The output end of the motor (7) passes through the drive hole (124) and is connected to the reduction gear set (5) for transmission.

9. A servo motor detection shaft according to claim 8, characterized in that: The lower end face of the lower cover (13) is provided with a circuit board (9), and the motor (7) and the potentiometer (6) are electrically connected to the circuit board (9).

10. A servo motor detection shaft according to claim 9, characterized in that: The lower cover (13) includes a drive ring (131), a transmission ring (132), and a connecting block (133). The lower parts of both sides of the connecting block (133) are respectively formed on the upper parts of the drive ring (131) and the transmission ring (132). The drive ring (131) is located below the drive mounting groove (123). The lower part of the motor (7) is embedded in the drive ring (131). The transmission ring (132) is located below the detection mounting groove (122). The drive ring (131), the transmission ring (132), and the connecting block (133) enclose a socket groove (134). The upper end face of the circuit board (9) is provided with a connecting socket (91), which is embedded in the socket groove (134).

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