A torque motor with adjustable shaft backlash

Abstract

This application relates to the field of electric motors, and more particularly to a torque motor with adjustable shaft clearance, comprising a mounting housing, a motor stator, and a motor rotor. The motor stator is mounted on the mounting housing, which has a rotor mounting hole. The motor rotor is rotatably fitted to the mounting housing via a rotating bearing. The outer ring of the rotating bearing is radially fitted against the inner wall of the rotor mounting hole, and the inner ring of the rotating bearing is radially fitted against the motor rotor. A bearing abutment ring is provided on the inner wall of the rotor mounting hole, and the bearing abutment ring is axially fitted against the outer ring of the rotating bearing from one side. The motor rotor has a rotor threaded hole, and a rotor knob is threaded into the rotor threaded hole. The rotor knob is axially fitted against the inner ring of the rotating bearing from the other side. This application reduces the adverse effects of bearing wear and loosening, enabling the rotor of the torque motor to maintain stability during long-term use.

Description

Technical Field

[0001] This application relates to the field of electric motors, and in particular to a torque motor with adjustable shaft backlash. Background Technology

[0002] A torque motor is a low-speed, high-torque direct-drive servo motor, typically used without a gearbox, with the rotor directly connected to the load. In existing technologies, a torque motor includes a housing, a stator, and a rotor. The stator is fixedly mounted to the housing, while the rotor rotates within the housing via bearings. Several permanent magnets are fixedly connected to the outer side of the rotor, which is enclosed by the stator. When the torque motor rotates, the constant magnetic field of the permanent magnets on the outer side of the rotor interacts with the rotating magnetic field of the stator, generating continuous electromagnetic torque, thereby directly driving the rotor to output low-speed, high-torque power.

[0003] Regarding the aforementioned technologies, torque motors used for direct-drive heavy loads require their bearings to withstand significant loads during operation, making them prone to wear and / or misalignment. This causes the clearance of the rotating shaft, which was originally calibrated at the factory, to gradually increase, leading to axial displacement of the rotor during rotation and consequently negatively impacting the long-term stability of the torque motor. Summary of the Invention

[0004] In order to reduce the adverse effects of bearing wear and loosening, and to ensure that the rotor of the torque motor remains stable during long-term use, this application provides a torque motor with adjustable shaft backlash.

[0005] The torque motor with adjustable shaft backlash provided in this application adopts the following technical solution:

[0006] A torque motor with adjustable shaft backlash includes a mounting housing, a motor stator, and a motor rotor;

[0007] The motor stator is mounted on a mounting housing, which has a rotor mounting hole. The motor rotor is rotatably fitted to the mounting housing via a rotary bearing. The outer ring of the rotary bearing is radially fitted against the inner wall of the rotor mounting hole, and the inner ring of the rotary bearing is radially fitted against the motor rotor.

[0008] The inner wall of the rotor mounting hole is provided with a bearing abutment ring, which abuts against the outer ring of the rotating bearing from one side along the axial direction.

[0009] The motor rotor has a rotor screw hole, and a rotor knob is threaded into the rotor screw hole. The rotor knob is axially mounted against the inner ring of the rotating bearing from the other side of the rotating bearing.

[0010] By adopting the above technical solution, when the bearing becomes loose due to wear, the rotor knob rotates relative to the motor rotor, causing the rotor knob to move axially closer to the rotating bearing until the bearing abutment ring is tightly fitted against the outer ring of the rotating bearing, and the rotor knob is then re-fitted against the inner ring of the rotating bearing. During this process, under the action of the rotor knob, the inner ring of the rotating bearing moves towards one side of the rotating bearing relative to the outer ring, thereby reducing or eliminating the displacement allowance caused by wear. This reduces the adverse effects of bearing wear and loosening, ensuring the rotor of the torque motor remains stable during long-term use.

[0011] Optionally, the rotor knob is provided with a turning surface, which is used to provide a force application point for the rotation of the rotor knob.

[0012] By adopting the above technical solution, the rotating plane makes it easier for operators to rotate the rotor knob, thus saving effort to accurately rotate the rotor knob by controlling the number of rotations.

[0013] Optionally, the opening of the rotor mounting hole is chamfered.

[0014] By adopting the above technical solution, it is convenient for operators to insert their hands or tools into the rotor mounting hole to rotate and adjust the rotor knob.

[0015] Optionally, two rotating bearings are provided, with the two rotating bearings located on both sides of the bearing abutment ring. The motor rotor and rotor knob are respectively abutted against the inner rings of the two rotating bearings in the axial direction, and the motor rotor and bearing abutment ring are respectively abutted against the inner and outer rings of the rotating bearings from both sides.

[0016] By adopting the above technical solution, when the rotor knob rotates relative to the motor rotor, the motor rotor and the rotor knob move toward the two rotating bearings respectively, until the inner rings of the two rotating bearings move closer to each other toward the bearing contact ring, thereby reducing or eliminating the displacement margin caused by wear, and reducing the adverse effects of bearing wear and loosening.

[0017] In addition, when the inner rings of the two rotating bearings approach each other towards the fixed bearing abutment ring, the axial position of the motor rotor is not prone to excessive displacement, that is, it is not prone to excessive axial displacement relative to the motor stator, so that the magnetic fields of the motor stator and the motor rotor can be fully coupled, thereby ensuring the output efficiency of the torque motor.

[0018] Optionally, the rotor mounting hole is threaded with a housing knob, which moves radially toward or away from the outer ring of the rotating bearing by its own rotation.

[0019] By adopting the above technical solution, the distance between the housing knob and the rotating bearing will change when the housing knob is rotated, thereby adjusting the axial offset range of the rotating bearing during the torque motor's operation (referring to the axial displacement caused by the motor rotor's heating or external impact). On the one hand, this reduces the occurrence of wear and heat generation due to excessively small rotating bearing range of motion; on the other hand, it also reduces the occurrence of instability due to excessively large rotating bearing range of motion.

[0020] In addition, rotating the outer casing knob before or after rotating the rotor knob into place will help ensure that the outer ring of the rotating bearing can re-tightly fit against the bearing abutment ring, thereby reducing the occurrence of instability due to excessive range of motion of the rotating bearing.

[0021] Furthermore, rotating the outer casing knob before fully engaging the rotor knob ensures that the outer ring of the rotating bearing is properly engaged with the bearing abutment ring. This also facilitates accurate assessment of the rotor knob's rotation amount later. For example, if the rotor knob is rotated before the outer ring of the rotating bearing is properly engaged with the bearing abutment ring, the knob may still be able to rotate even after the outer ring can no longer move axially relative to the inner ring (continuous rotation in this case would push both the outer and inner rings towards the bearing abutment ring). This would interfere with the operator's adjustment of the rotating bearing, making it impossible to accurately determine whether the inner ring is properly engaged. Using the outer casing knob to pre-engage the outer ring with the bearing abutment ring helps reduce this possibility.

[0022] Optionally, the housing knob is equipped with a limiting spring, which is positioned toward the rotating bearing.

[0023] By adopting the above technical solution, the limiting spring can adaptively adjust itself according to the magnitude of the axial displacement of the rotating bearing during the torque motor's movement, thereby further reducing the adverse effects of the rotating bearing's excessive or insufficient range of motion.

[0024] Optionally, the outer ring of the rotating bearing is fixedly sleeved with a bearing collar, and the outer ring of the rotating bearing is tightly fitted against the inner wall of the rotor mounting hole through the bearing collar. The bearing collar has an annular positioning groove, and the annular extension direction of the annular positioning groove is coaxially arranged with the rotation direction of the housing knob. The limiting spring moves into the interior of the annular positioning groove through the rotation of the housing knob.

[0025] By adopting the above technical solution, on the one hand, the axial movement range of the rotating bearing can be adaptively adjusted by the limiting spring. On the other hand, when it is necessary to tighten the outer ring of the rotating bearing against the bearing abutment ring by rotating the housing knob, the limiting spring can gradually align and enter the interior of the ring's positioning groove when the housing knob is rotated. This allows the housing knob to directly abut against the bearing collar and / or outer ring, reducing the elastic contact caused by the limiting spring. This facilitates the rapid tightening of the outer ring against the bearing abutment ring and reduces the occurrence of damage to the limiting spring due to compression.

[0026] Optionally, the bearing collar is interference-fitted to the outer ring of the rotating bearing.

[0027] By adopting the above technical solution, the connection between the outer ring of the rotating bearing and the bearing collar is made more stable, and the structure is simple and reliable.

[0028] Optionally, the mounting housing has an axial limiting groove, and the housing knob has a knob protrusion. The knob protrusion slides axially and engages with the axial limiting groove. When the distance between the limiting spring and the rotating bearing is a set value, the knob protrusion is axially attached to the inner wall of the axial limiting groove.

[0029] By adopting the above technical solution, it is convenient for workers to continuously rotate the outer ring of the rotating bearing against the bearing contact ring in the opposite direction until it can no longer be rotated. There is no need to estimate or measure the amount of rotation of the outer ring knob, so that the distance between the limit spring and the rotating bearing can be restored to the design value, thereby reducing the adverse effects of the rotating bearing having too large or too small a range of motion.

[0030] Optionally, the mounting housing is bolted with an axial limiting plate, which is used to close the axial limiting groove. When the distance between the limiting spring and the rotating bearing is a set value, the knob protrusion axially abuts against the inner wall of the axial limiting groove, which refers to the surface of the axial limiting plate.

[0031] By adopting the above technical solution, it is convenient to assemble and replace the axial limiting plate, and it is also convenient to clean and maintain the inside of the axial limiting groove, reducing the adverse effects of foreign objects on the knob protrusion stroke.

[0032] In summary, this application includes at least one of the following beneficial technical effects:

[0033] When a bearing becomes loose due to wear, the rotor knob rotates relative to the motor rotor, causing the rotor knob to move axially closer to the rotating bearing until the bearing abutment ring is tightly fitted against the outer ring of the rotating bearing, and the rotor knob is then re-fitted against the inner ring of the rotating bearing. During this process, the inner ring of the rotating bearing moves towards one side of the rotating bearing relative to the outer ring under the action of the rotor knob. This reduces or eliminates the displacement allowance caused by wear, thereby mitigating the adverse effects of bearing wear and loosening, and ensuring the stability of the torque motor rotor during long-term use.

[0034] When the rotor knob rotates relative to the motor rotor, the motor rotor and the rotor knob move toward the two rotating bearings respectively, until the inner rings of the two rotating bearings move closer to each other toward the bearing contact ring, thereby reducing or eliminating the displacement margin caused by wear and reducing the adverse effects of bearing wear and loosening.

[0035] When the inner rings of the two rotating bearings approach each other towards the fixed bearing abutment ring, the axial position of the motor rotor is not prone to excessive displacement, that is, it is not prone to excessive axial displacement relative to the motor stator, so that the magnetic fields of the motor stator and the motor rotor can be fully coupled, thereby ensuring the output efficiency of the torque motor.

[0036] When the housing knob is rotated, the distance between the housing knob and the rotating bearing changes, thereby adjusting the axial offset of the rotating bearing (referring to the axial displacement caused by the extension of the motor rotor due to heat or external impact) during the torque motor's operation. On the one hand, this reduces wear and heat generation caused by an excessively small range of motion in the rotating bearing; on the other hand, it also reduces instability caused by an excessively large range of motion in the rotating bearing.

[0037] In addition, rotating the outer casing knob before or after rotating the rotor knob into place will help ensure that the outer ring of the rotating bearing can re-tightly fit against the bearing abutment ring, thereby reducing the occurrence of instability due to excessive range of motion of the rotating bearing.

[0038] Furthermore, rotating the outer casing knob before fully engaging the rotor knob ensures that the outer ring of the rotating bearing is properly engaged with the bearing abutment ring. This also facilitates accurate assessment of the rotor knob's rotation amount later. For example, if the rotor knob is rotated before the outer ring of the rotating bearing is properly engaged with the bearing abutment ring, the knob may still be able to rotate even after the outer ring can no longer move axially relative to the inner ring (continuous rotation in this case would push both the outer and inner rings towards the bearing abutment ring). This would interfere with the operator's adjustment of the rotating bearing, making it impossible to accurately determine whether the inner ring is properly engaged. Using the outer casing knob to pre-engage the outer ring with the bearing abutment ring helps reduce this possibility. Attached Figure Description

[0039] Figure 1 This is a first overall schematic diagram of a torque motor with adjustable shaft clearance according to Embodiment 1 of this application.

[0040] Figure 2 This is a second overall schematic diagram of a torque motor with adjustable shaft clearance according to Embodiment 1 of this application.

[0041] Figure 3 This is a schematic cross-sectional view of the torque motor with adjustable shaft clearance in Embodiment 1 of this application.

[0042] Figure 4 This is a schematic cross-sectional view of the torque motor with adjustable shaft clearance in Embodiment 2 of this application.

[0043] Figure 5 This is an overall schematic diagram of the housing installation in Embodiment 2 of this application.

[0044] Figure 6 This is a schematic cross-sectional view of the torque motor with adjustable shaft clearance in Embodiment 3 of this application.

[0045] Figure 7 yes Figure 6 Enlarged schematic diagram of part A.

[0046] Figure 8 This is a schematic diagram of the first mating between the outer casing knob and the bearing collar in Embodiment 3 of this application.

[0047] Figure 9 This is a schematic diagram of the second mating between the outer casing knob and the bearing collar in Embodiment 3 of this application.

[0048] Explanation of reference numerals in the attached drawings: 1. Mounting housing; 101. Rotor mounting hole; 102. Axial limiting groove; 11. Bearing abutment ring; 12. Limiting protrusion ring; 13. Axial limiting plate; 2. Motor stator; 3. Motor rotor; 301. Rotor screw hole; 4. Rotary bearing; 41. Bearing collar; 411. Ring fitting groove; 5. Rotor knob; 501. Tightening plane; 6. Housing knob; 61. Outer ring abutment part; 62. Limiting spring; 63. Knob protrusion. Detailed Implementation

[0049] The following is in conjunction with the appendix Figure 1-9 This application will be described in further detail.

[0050] Example 1: This application discloses a torque motor with adjustable shaft backlash. (Refer to...) Figure 1 and Figure 2 The torque motor with adjustable shaft clearance includes a mounting housing 1, a motor stator 2, and a motor rotor 3.

[0051] Combination Figure 3 The mounting housing 1 is cylindrical, and a stator receiving groove is formed on the outer ring of the mounting housing 1. The stator receiving groove is annular. The motor stator 2 is located inside the stator receiving groove, and the stator of the motor stator 2 is fixedly installed on the inner wall of the stator receiving groove.

[0052] The inner ring of the mounting housing 1 has a through-hole 101 for rotor mounting. The inner side of the motor rotor 3 is rotatably fitted to the mounting housing 1 via a rotating bearing 4. Several permanent magnets are fixedly mounted on the outer side of the motor rotor 3. These permanent magnets are axially distributed around the axis of the motor rotor 3, so that the magnetic fields of the motor stator 2 and the motor rotor can be fully coupled, thereby ensuring the output efficiency of the motor rotor 3.

[0053] The outer ring of the rotary bearing 4 is radially fitted against the inner wall of the rotor mounting hole 101, and the inner ring of the rotary bearing 4 is radially fitted against the motor rotor 3, enabling the motor rotor 3 to rotate with low resistance. Furthermore, in this embodiment, the rotary bearing 4 is a ball bearing as known in the art, and includes an outer ring and an inner ring with grooves, a plurality of balls located between the inner and outer ring grooves, and a cage for separating the balls.

[0054] Reference Figure 3 A bearing abutment ring 11 is integrally provided on the inner wall of the rotor mounting hole 101. The bearing abutment ring 11 is axially fitted against the outer ring of the rotating bearing 4 from one side. The motor rotor 3 has a rotor threaded hole 301 extending through it axially. A rotor knob 5 is threaded onto one end of the rotor threaded hole 301. The rotor knob 5 is axially fitted against the inner ring of the rotating bearing 4 from the other side. By rotating the rotor knob 5 relative to the motor rotor 3, the distance between the bearing abutment ring 11 and the rotor knob 5 can be increased or decreased.

[0055] When the rotating bearing 4 becomes loose due to wear, the rotor knob 5 is moved axially closer to the rotating bearing 4 until the bearing abutment ring 11 is tightly fitted against the outer ring of the rotating bearing 4, and the rotor knob 5 is then re-tightened against the inner ring of the rotating bearing 4. During this process, under the action of the rotor knob 5, the inner ring of the rotating bearing 4 moves relative to the outer ring of the rotating bearing 4 towards one side of the rotating bearing 4 until the inner and outer rings can no longer misalign. This reduces or eliminates the displacement allowance caused by wear, thereby reducing the adverse effects of the loosening of the rotating bearing 4 and ensuring that the rotor of the torque motor remains stable during long-term use.

[0056] In some other embodiments, the distance between the bearing contact ring 11 and the outer ring of the rotating bearing 4, and / or the distance between the rotor knob 5 and the inner ring of the rotating bearing 4, can be adjusted by rotating the rotor knob 5 to maintain a suitable range, making the torque motor more suitable for different output power and output speed scenarios.

[0057] Additionally, refer to Figure 2 The rotor knob 5 has two turning surfaces 501, both of which provide force points for the rotation of the rotor knob 5, making it easier and more accurate for operators to rotate the rotor knob 5, thus reducing effort in controlling the number of rotations. The opening of the rotor mounting hole 101 is also chamfered, so that operators can insert their hands or tools into the rotor mounting hole 101 to rotate and adjust the rotor knob 5.

[0058] The implementation principle of a torque motor with adjustable shaft clearance in this application embodiment is as follows: after the bearing wears out, the inner and outer rings of the rotating bearing 4 are misaligned by rotating the rotor knob 5 until the axial displacement between the inner and outer rings of the rotating bearing 4 is eliminated or controlled within a reasonable range, thereby reducing the adverse effects of bearing wear and loosening, and enabling the rotor of the torque motor to remain stable during long-term use.

[0059] Example 2: This application discloses a torque motor with adjustable shaft backlash, which differs from Example 1 mainly in that: compared with... Figure 3 and Figure 4 The inner side of the motor rotor 3 is rotatably fitted to the mounting housing 1 via two rotating bearings 4.

[0060] Reference Figure 4 and Figure 5 There are two rotating bearings 4, which are located on both sides of the bearing abutment ring 11. The bearing abutment ring 11 is tightly fitted to the outer ring of the two rotating bearings 4, and the motor rotor 3 and rotor knob 5 are tightly fitted to the inner ring of the two rotating bearings 4 along the axial direction.

[0061] The implementation principle of a torque motor with adjustable shaft clearance in this application embodiment is as follows: when the rotor knob 5 rotates relative to the motor rotor 3, the inner rings of the two rotating bearings 4 can move closer to each other towards the bearing abutment ring 11, thereby reducing or eliminating the displacement margin caused by wear and reducing the adverse effects of bearing wear and loosening.

[0062] Furthermore, when the inner rings of the two rotating bearings 4 approach each other toward the fixed bearing abutment ring 11, compared to the case of only one rotating bearing 4 in Embodiment 1, the motor rotor 3 is less likely to undergo excessive axial displacement relative to the motor stator 2, so that the magnetic fields of the motor stator 2 and the motor rotor can be fully coupled, thereby ensuring the output efficiency of the torque motor for a long time.

[0063] Example 3: This application discloses a torque motor with adjustable shaft backlash, which, in addition to all the technical features of Example 2, also includes the following technical features:

[0064] Reference Figure 6 and Figure 7 The mounting housing 1 is provided with a limiting protrusion 12, which, along with a bearing abutment ring 11, is tightly fitted against both sides of the outer ring of one of the rotating bearings 4, preventing axial displacement of the rotating bearing 4. A bearing collar 41 is fitted onto the outer ring of the other rotating bearing 4, and the outer ring of the rotating bearing 4 is tightly fitted against the inner wall of the rotor mounting hole 101 via the bearing collar 41. The bearing collar 41 is interference-fitted to the outer ring of the rotating bearing 4, ensuring a secure fixation of the bearing collar 41 to the rotating bearing 4 and facilitating synchronized movement between the bearing collar 41 and the outer ring of the rotating bearing 4.

[0065] The rotor mounting hole 101 has a threaded connection to a housing knob 6 at one end near the rotor knob 5, allowing the housing knob 6 to move radially closer to or further away from the outer ring of the rotary bearing 4 through its rotation. The end of the housing knob 6 facing the rotary bearing 4 also has an outer ring abutment portion 61, which contacts the outer ring of the rotary bearing 4 through the rotation of the housing knob 6. By the housing knob 6 acting on the bearing collar 41 and the outer ring of the rotary bearing 4, the rotary bearing 4 can be pushed towards the position of the bearing abutment ring 11, thus facilitating the reset of the rotary bearing 4 and reducing axial displacement of the rotary bearing 4 due to heat or external forces during the torque motor's operation.

[0066] Reference Figure 8 and Figure 9 The bearing collar 41 has four annular grooves 411, which are circumferentially distributed around the axis of the bearing collar 41. The extension direction of the annular grooves 411 is coaxial with the rotation direction of the housing knob 6, and the edges of the annular grooves 411 are chamfered. The housing knob 6 is fixedly equipped with four elastic limiting springs 62, which correspond to each annular groove 411.

[0067] All four limiting springs 62 are positioned facing the rotating bearing 4. Under normal conditions, the limiting springs 62 are positioned directly opposite the area between the two adjacent ring grooves 411 of the bearing collar 41. This allows the limiting springs 62 to abut against the bearing collar 41 when the bearing collar 41 moves axially, thereby adaptively limiting the axial displacement range of the bearing collar 41 and the rotating bearing 4, and reducing the adverse effects of the rotating bearing 4 having an excessively large or small range of motion.

[0068] When the outer ring of the rotating bearing 4 needs to be tightly fitted against the bearing abutment ring 11 by rotating the outer ring knob 6, the four limiting springs 62 can gradually align and slide into the interior of the ring-shaped positioning groove 411 when the outer ring knob 6 is rotated. This allows the outer ring knob 6 to directly abut against the bearing collar 41 and the outer ring of the rotating bearing 4 through the outer ring abutment part 61, reducing the elastic contact caused by the limiting springs 62. This is beneficial for quickly tightening the outer ring against the bearing abutment ring 11 and also helps to reduce the occurrence of damage to the limiting springs 62 due to squeezing.

[0069] Reference Figure 6 and Figure 8 The mounting housing 1 has an axial limiting groove 102, and an axial limiting plate 13 is bolted to the mounting housing 1. The axial limiting plate 13 is used to close one side of the axial limiting groove 102. The housing knob 6 has an integral knob protrusion 63, which slides axially and engages with the axial limiting groove 102. When the distance between the limiting spring 62 and the rotating bearing 4 is rotated to a set value that is neither too large nor too small, the knob protrusion 63 axially abuts against the inner wall of the axial limiting groove 102, that is, against the surface of the axial limiting plate 13 that closes the axial limiting groove 102. The axial limiting plate 13 allows the operator to continuously rotate the housing knob 6 in the opposite direction until it can no longer be rotated after pushing the outer ring of the rotating bearing 4 against the bearing abutment ring 11. Without estimating or measuring the amount of rotation of the housing knob 6, the distance between the limiting spring 62 and the rotating bearing 4 can be restored to the design value, thereby further reducing the adverse effects of the rotating bearing 4 having an excessively large or small range of motion.

[0070] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A torque motor with adjustable shaft gap, characterized in that: Install the shell (1), motor stator (2) and motor rotor (3); The motor stator (2) is installed on the mounting shell (1), the mounting shell (1) is provided with a rotor mounting hole (101), the motor rotor (3) is rotatably connected to the mounting shell (1) through a rotating bearing (4), the outer ring of the rotating bearing (4) is tightly fitted to the inner wall of the rotor mounting hole (101) in the radial direction, and the inner ring of the rotating bearing (4) is tightly fitted to the motor rotor (3) in the radial direction; The inner wall of the rotor mounting hole (101) is provided with a bearing abutting ring (11), and the bearing abutting ring (11) is tightly fitted to the outer ring of the rotating bearing (4) from one side of the rotating bearing (4) in the axial direction; The motor rotor (3) is provided with a rotor screw hole (301), and the rotor screw hole (301) is threadedly connected with a rotor knob (5), and the rotor knob (5) is tightly fitted to the inner ring of the rotating bearing (4) from the other side of the rotating bearing (4) in the axial direction; The rotating bearing (4) is provided with two rotating bearings (4), and the two rotating bearings (4) are respectively located on both sides of the bearing abutting ring (11), the motor rotor (3) and the rotor knob (5) are respectively tightly fitted to the inner rings of the two rotating bearings (4) in the axial direction, and the motor rotor (3) and the bearing abutting ring (11) are respectively tightly fitted to the inner ring and the outer ring of the rotating bearing (4) from both sides; The rotor mounting hole (101) is threadedly connected with a shell knob (6), and the shell knob (6) is moved towards or away from the outer ring of the rotating bearing (4) in the radial direction through rotation of the shell knob (6) itself; The shell knob (6) is provided with a limiting spring piece (62), and the limiting spring piece (62) is arranged towards the rotating bearing (4); The outer ring of the rotating bearing (4) is fixedly sleeved with a bearing sleeve ring (41), and the outer ring of the rotating bearing (4) is tightly fitted to the inner wall of the rotor mounting hole (101) through the bearing sleeve ring (41), the bearing sleeve ring (41) is provided with an annular containing groove (411), the annular extension direction of the annular containing groove (411) is coaxially arranged with the rotation direction of the shell knob (6), and the limiting spring piece (62) is moved to the inside of the annular containing groove (411) through the rotation of the shell knob (6).

2. A torque motor with adjustable axial gap according to claim 1, characterized in that: The rotor knob (5) is provided with a screwing plane (501), and the screwing plane (501) is used for providing a force point for the rotation of the rotor knob (5).

3. A torque motor with adjustable axial gap according to claim 2, characterized in that: The opening of the rotor mounting hole (101) is chamfered.

4. A torque motor with adjustable axial gap according to claim 1, characterized in that: The bearing sleeve ring (41) is interference-fitted to the outer ring of the rotating bearing (4).

5. A torque motor with adjustable axial gap according to claim 1, characterized in that: The mounting shell (1) is provided with an axial limiting groove (102), the shell knob (6) is provided with a knob protrusion (63), the knob protrusion (63) is axially slidably connected to the axial limiting groove (102), and when the distance between the limiting spring piece (62) and the rotating bearing (4) is a set value, the knob protrusion (63) is axially fitted to the inner wall of the axial limiting groove (102).

6. A torque motor with adjustable axial gap according to claim 5, characterized in that: The mounting shell (1) is bolted with an axial limiting plate (13) for closing the axial limiting groove (102), and when the distance between the limiting spring piece (62) and the rotating bearing (4) is a set value, the knob convex (63) is axially fitted to the inner wall of the axial limiting groove (102), namely the surface of the axial limiting plate (13).

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