A direct drive torque motor with a transmission structure

Abstract

The present invention discloses a direct drive torque motor with a transmission structure, which includes a housing. A partition plate and a support frame are arranged inside the housing. A stator and a rotor are arranged on one side of the partition plate. An output shaft penetrates through the partition plate. One end of the output shaft is connected to the rotor, and the other end is connected to the support frame. A driving helical gear is arranged on the output shaft between the partition plate and the support frame. The driving helical gear rotates coaxially with the output shaft and can also move axially along the output shaft. The same buffer springs are sleeved on the output shaft on both sides of the driving helical gear. By using the principle that axial force is generated when helical gears mesh with each other, and by pushing the driving helical gear with the same buffer springs installed on both sides of the driving helical gear, when the motor is driven, the driving helical gear will rotate, while the transmission helical gear will not rotate simultaneously with the driving helical gear due to its association with the load. Therefore, the driving helical gear will slide axially along the output shaft and compress the buffer springs, avoiding the influence of direct force transmission on the service life of the gears and the motor output shaft.

Description

Technical Field

[0001] The present invention belongs to the technical field of torque motor drive, and in particular relates to a direct drive torque motor with a transmission structure. Background Art

[0002] A motor is a device that converts electrical energy into mechanical energy. It uses an energized coil (i.e., the stator winding) to generate a rotating magnetic field and acts on the rotor (such as a squirrel-cage closed aluminum frame) to form a magnetoelectric dynamic rotating torque.

[0003] Motors are divided into DC motors and AC motors according to the different power supplies used. Most of the motors in the power system are AC motors, which can be synchronous motors or asynchronous motors (the rotational speed of the stator magnetic field of the motor does not maintain the synchronous speed with the rotational speed of the rotor).

[0004] A motor mainly consists of a stator and a rotor. The direction of the force acting on the energized wire in the magnetic field is related to the direction of the current and the direction of the magnetic induction line (magnetic field direction). The working principle of the motor is the action of the magnetic field on the current, which causes the motor to rotate.

[0005] Motors are mainly used to provide power for equipment. At present, the output shafts of motors are all connected to loads in a direct connection form. When the equipment starts, the motor will receive a reaction force from the load. Being instantly subjected to a large force is likely to cause damage to the connection part between the motor and the load, and also cause fatigue damage to the motor shaft, affecting the service life of the motor. Therefore, it is necessary for us to design a direct drive torque motor with a transmission structure to solve these problems. Summary of the Invention

[0006] The problem to be solved by the present invention is to provide a direct drive torque motor with a transmission structure.

[0007] To solve the above technical problems, the technical solution adopted by the present invention is:

[0008] A direct drive torque motor with a transmission structure includes a housing. A partition and a support frame are arranged inside the housing. A stator and a rotor are arranged on one side of the partition. An output shaft penetrates through the partition. One end of the output shaft is connected to the rotor, and the other end is connected to the support frame. A driving helical gear is arranged on the output shaft between the partition and the support frame. The driving helical gear rotates coaxially with the output shaft and can also move axially along the output shaft. The same buffer springs are sleeved on the output shaft on both sides of the driving helical gear. A transmission helical gear is rotatably arranged on the partition on one side of the driving helical gear. The transmission helical gear meshes with the driving helical gear. An output helical gear is also arranged on the support frame. The output helical gear meshes with the transmission helical gear.

[0009] Preferably, a transmission groove is provided on the output shaft between the partition plate and the support frame. The extension direction of the transmission groove is the same as the axial direction of the output shaft. An assembly hole is provided on the driving bevel gear, and a transmission block is provided in the assembly hole. The transmission block is located in the transmission groove and is slidably matched with the transmission groove.

[0010] With such a setting, the driving bevel gear can be driven to rotate through the mutual cooperation of the transmission groove and the transmission block, and it can also ensure that the driving bevel gear can slide along the axial direction of the output shaft.

[0011] Preferably, a limiting groove is further provided on the output shaft. The limiting groove is located between two of the transmission grooves. The extension direction of the limiting groove is the same as that of the transmission groove, and the depth is greater than that of the transmission groove. A stop block is provided in the middle of the limiting groove. Sliding rings are sleeved on the output shaft on both sides of the driving bevel gear, and a limiting block is provided on the inner side of the sliding ring. The limiting block is located in the limiting groove.

[0012] With such a setting, the sliding ring can be limited by the limiting groove, and it can ensure that the distances from the driving gear to both ends are the same.

[0013] Preferably, a support groove is provided on the support frame. Support blocks are provided on both the output bevel gear and the output shaft. The support blocks are rotatably matched with the support groove.

[0014] With such a setting, the output shaft and the output bevel gear can be supported by the support groove, increasing the stability during rotation.

[0015] Preferably, pressure bearings are further sleeved on the output shaft on both sides of the driving bevel gear. The buffer spring is located between the pressure bearing and the sliding ring, and the sliding ring is in contact with the driving bevel gear.

[0016] With such a setting, the friction force between the buffer spring and the contact surfaces of the partition plate and the support frame during rotation with the sliding ring can be reduced.

[0017] Preferably, spring seats are provided on both the sliding ring and the pressure bearing. Both ends of the buffer spring are respectively sleeved on the spring seats.

[0018] With such a setting, the stability of the connection between the buffer spring and the pressure bearing and the sliding ring is ensured, and the buffer spring is prevented from shifting under the influence of centrifugal force after rotating with the output shaft.

[0019] Preferably, the number of the transmission bevel gears is at least two and they are evenly distributed around the driving bevel gear.

[0020] With such a setting, the driving bevel gear can be symmetrically stressed on both sides, avoiding uneven wear caused by unilateral stress.

[0021] Preferably, a mounting shaft is fixedly arranged on the partition board, and the transmission helical gear is rotatably connected to the partition board through the mounting shaft.

[0022] With such a setting, it is convenient for the installation and disassembly of the transmission helical gear.

[0023] Preferably, a front cover is arranged at one end of the outer shell, a transmission shaft is fixedly arranged on the output helical gear, the free end of the transmission shaft penetrates out of the front cover, and a rear cover is arranged at the other end of the outer shell.

[0024] With such a setting, the components inside the outer shell can be protected.

[0025] The advantages and positive effects of the present invention are:

[0026] By utilizing the principle that axial force will be generated when helical gears mesh with each other, buffer springs of the same type are installed on both sides of the driving helical gear to push the driving helical gear. When the motor drives, the driving helical gear will rotate, while the transmission helical gear will not rotate simultaneously with the driving helical gear due to being related to the load. Therefore, the driving helical gear will slide axially along the output shaft and compress the buffer spring, avoiding the influence of direct force transmission on the service life of the gears and the output shaft of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0028] Figure 1 is a schematic diagram of the external structure of the present invention;

[0029] Figure 2 is a three-dimensional internal structure diagram of the present invention;

[0030] Figure 3 is a plan view of the internal structure of the present invention;

[0031] Figure 4 is a schematic diagram of the positions of the transmission groove, the limiting groove and the stop block on the output shaft of the present invention;

[0032] Figure 5 is a schematic diagram of the positions of the assembly holes and the transmission pipes on the driving helical gear of the present invention;

[0033] Figure 6 is a schematic diagram of the positions of the sliding ring, the limiting block and the spring seat of the present invention;

[0034] Figure 7Schematic diagram of the positions of the mounting shaft and mounting holes on the partition plate of the present invention;

[0035] Figure 8 Schematic diagram of the mounting positions of the driving helical gear and buffer spring of the present invention;

[0036] Figure 9 Schematic diagram of the structure of the support frame and the position of the support groove of the present invention;

[0037] Figure 10 is Figure 3 Enlarged view of the structure at position A in

[0038] Explanation of the reference numerals in the drawings is as follows:

[0039] 1. Outer shell; 2. Partition plate; 3. Transmission chamber; 4. Driving chamber; 5. Stator; 6. Rotor; 7. Output shaft; 8. Rear cover; 9. Transmission groove; 10. Limiting groove; 11. Stopper; 12. Support block; 13. Pressure bearing; 14. Buffer spring; 15. Sliding ring; 16. Spring seat; 17. Driving helical gear; 18. Transmission helical gear; 19. Mounting shaft; 20. Support frame; 21. Output helical gear; 22. Transmission shaft; 23. Mounting hole; 24. Support groove; 25. Front cover; 26. Transmission block; 27. Limiting block; 28. Assembly hole. Detailed implementation manners

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0041] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] The following further describes the present invention with reference to the accompanying drawings:

[0043] Embodiment 1: As Figure 1 shown, a direct drive torque motor with a transmission structure includes a housing 1. A partition 2 and a support frame 20 are arranged inside the housing 1. The partition 2 divides the inside of the housing into a drive chamber 4 and a transmission chamber 3. The support frame 20 is located in the transmission chamber 3. A stator 5 and a rotor 6 are arranged in the drive chamber 4 on one side of the partition 2. An installation hole 23 is provided on the partition 2. An output shaft 7 passes through the installation hole 23. One end of the output shaft 7 is connected to the rotor 6, and the other end is connected to the support frame 20. A drive bevel gear 17 is arranged on the output shaft 7 between the partition 2 and the support frame 20. The drive bevel gear 17 rotates coaxially with the output shaft 7 and can also move axially along the output shaft 7. Buffer springs 14 with the same elastic force are sleeved on the output shaft 7 on both sides of the drive bevel gear 17. A transmission bevel gear 18 is rotatably arranged on the partition 2 on one side of the drive bevel gear 17. The transmission bevel gear 18 meshes with the drive bevel gear 17. An output bevel gear 21 is also arranged on the support frame 20. The output bevel gear 21 meshes with the transmission bevel gear 18.

[0044] Referring to Figure 5 and Figure 6 for description, a transmission groove 9 is arranged on the output shaft 7 between the partition 2 and the support frame 20. The extending direction of the transmission groove 9 is the same as the axial direction of the output shaft 7. An assembly hole 28 is provided on the drive bevel gear 17. A transmission block 26 is arranged in the assembly hole 28. The transmission block 26 is located in the transmission groove 9 and is in sliding fit with the transmission groove 9. Such a setting can not only realize the rotation of the drive bevel gear 17 with the output shaft 7 but also enable the drive bevel gear 17 to slide axially along the output shaft 7.

[0045] Specifically, a limit groove 10 is also arranged on the output shaft 7. The limit groove 10 is located between two of the transmission grooves 9. The extending direction of the limit groove 10 is the same as that of the transmission groove 9, and the depth is greater than that of the transmission groove 9. A stop block 11 is arranged in the middle of the limit groove 10. The length of the stop block 11 is the same as the thickness of the drive bevel gear 17. Sliding rings 15 are sleeved on the output shaft 7 on both sides of the drive bevel gear 17. As Figure 7As shown in the figure, a limiting block 27 is arranged inside the sliding ring 15. The limiting block 27 is located in the limiting groove 10. To ensure that the limiting block 27 can be blocked by the blocking block 11, the sum of the thicknesses of the limiting block 27 and the blocking block 11 is greater than the depth of the limiting groove 10, and the sum of the thicknesses of the transmission block 26 and the blocking block 11 in the limiting groove 10 is less than the depth of the limiting groove 10. This can ensure that the driving bevel gear 17 can slide along the axis direction of the output shaft 7.

[0046] Refer to Figure 2 、 Figure 3 and Figure 10 for description. Pressure bearings 13 are also sleeved on the output shaft 7 on both sides of the driving bevel gear 17. The buffer spring 14 is located between the pressure bearing 13 and the sliding ring 15, and the sliding ring 15 is in contact with the driving bevel gear 17. Such a setting can reduce the frictional force between the buffer spring 14 and the contact surfaces of the partition plate 2 and the support frame 20 when the buffer spring 14 rotates with the sliding ring 15.

[0047] Refer to Figure 3 、 Figure 3 and Figure 9 for description. A support groove 24 is arranged on the support frame 20. Support blocks 12 are arranged on both the output bevel gear 21 and the output shaft 7. The support blocks 12 are rotationally matched with the support groove 24. The output shaft 7 and the output bevel gear 21 can be supported through the support groove 24, increasing the stability.

[0048] Specifically, spring seats 16 are arranged on both the sliding ring 15 and the pressure bearing 13. The two ends of the buffer spring 14 are respectively sleeved on the spring seats 16. Such a setting ensures the stability of the connection between the buffer spring 14 and the pressure bearing 13 and the sliding ring 15, and avoids the offset of the buffer spring 14 due to the influence of centrifugal force after rotating with the output shaft 7.

[0049] Such as Figure 2 、 Figure 3 、 Figure 4 and Figure 8 shown in the figure, the number of transmission bevel gears 18 is at least two, and they are evenly distributed around the driving bevel gear 17. Such a setting can make the two sides of the driving bevel gear 17 symmetrically stressed, avoid uneven wear caused by unilateral stress, improve the stability of the transmission of the driving bevel gear 17 driving the output bevel gear 21, and ensure the effective output of power.

[0050] Specifically, a mounting shaft 19 is fixedly arranged on the partition plate 2. The transmission bevel gear 18 is rotationally connected to the partition plate 2 through the mounting shaft 19. Such a setting facilitates the installation and disassembly of the transmission bevel gear 18.

[0051] Such as Figure 1As shown, a front cover 25 is provided at one end of the outer shell 1. A transmission shaft 22 is fixedly provided on the output helical gear 21. The free end of the transmission shaft 22 passes through the front cover 25. A rear cover 8 is provided at the other end of the outer shell 1. The outer shell 1 is sealed by the front cover 25 and the rear cover 8, which can protect the internal parts of the outer shell 1 and prevent foreign matters from entering and affecting the normal operation of the motor. The transmission shaft 22 can achieve power output.

[0052] Working process of this embodiment: After the motor is powered on, the coils on the stator 5 winding will be energized. The stator 5 winding will generate a magnetic field after being powered on. The rotor 6 will drive the output shaft 7 to rotate under the action of the magnetic field of the stator 5 winding. After the output shaft 7 rotates, it will drive the driving helical gear 17 to rotate under the cooperation of the transmission groove 9 and the transmission pipe. Since the transmission shaft 22 is connected to an external load at this time, and the transmission shaft 22 is connected to the transmission helical gear 18 through the output helical gear 21, when the driving helical gear 17 rotates, it will receive a reaction force transmitted from the external load to the transmission helical gear 18. At this time, the driving helical gear 17 will slide along the output shaft 7 under the action of the radial force. During the sliding process of the driving helical gear 17, it will push the sliding ring 15 to compress the buffer spring 14. The thrust applied to the sliding ring 15 when the buffer spring 14 is compressed will gradually increase. Until it is the same as the reaction force transmitted from the external load to the transmission helical gear 18, the transmission helical gear 18 will be driven by the driving helical gear 17 to rotate. After the transmission helical gear 18 rotates, the compressed buffer spring 14 will elongate and push the driving helical gear 17 to reset.

[0053] During the process of the driving helical gear 17 driving the transmission helical gear 18 to rotate, the thrust applied by the buffer spring 14 to the sliding ring 15 gradually increases. Therefore, the driving force transmitted from the driving helical gear 17 to the transmission helical gear 18 also gradually increases. So the driving helical gear 17 and the output helical gear 21 will not be damaged due to being instantaneously impacted by a large force. And during the working process, if the load changes, the buffer helical gear can cope with the impact of the external load by sliding axially along the output shaft 7, thereby reducing the metal fatigue of each component caused by the impact, and further extending the service life of each component.

[0054] In this embodiment, the axial force received by the driving helical gear 17 refers to the magnitude of the force generated along the axis direction under the action of the tooth direction force of the gear. It is caused by the friction and pressure between the gear teeth.

[0055] The calculation formula for the axial force of the helical gear is as follows:

[0056] Fa=(Fr*tanα) / (cosβ*cosγ)

[0057] Among them, Fa represents the magnitude of the axial force of the helical gear, Fr represents the magnitude of the circumferential force of the gear, α represents the meshing angle, β represents the cone angle of the gear, and γ represents the axis angle of the gear.

[0058] The judgment of the direction of the axial force on a helical gear is carried out according to the helix direction of the teeth on the helical gear and the rotation direction of the gear.

[0059] First, the first step is to determine the helix direction of the helical teeth. When judging, place the gear with the end face facing down as shown. Figure 6 If the teeth are inclined towards the upper right, it is a right-handed helix; otherwise, it is a left-handed helix. The helical gear in Figure 6 is a right-handed helix.

[0060] The second step is to determine the rotation direction of the gear;

[0061] The third step is to use the left and right hand rules for judgment. The content of the left and right hand rules is as follows: Make a fist with the hand, and the direction of the bent four fingers is the same as the rotation direction of the gear, and the direction pointed by the thumb is the direction of the axial force.

[0062] Among them, a right-handed helical gear needs to be judged with the right hand, while a left-handed helical gear needs to be judged with the left hand.

[0063] It should be noted that the force directions of the driving gear and the driven gear are opposite.

[0064] Taking this embodiment as an example for illustration, first refer to Figure 6 to judge that the driving helical gear 17 is a right-handed helical gear;

[0065] If the output shaft 7 rotates clockwise, the driving helical gear 17 will also rotate clockwise. Refer to Figure 4 for judgment. At this time, the axial force received by the driving helical gear 17 points towards the motor;

[0066] If the output shaft 7 rotates counterclockwise, the driving helical gear 17 will also rotate counterclockwise. Refer to Figure 4 for judgment. At this time, the axial force received by the driving helical gear 17 points towards the output helical gear 21;

[0067] The transmission helical gear 18 is driven to rotate by the driving helical gear 17, so the transmission helical gear 18 is a driven gear. At this time, the direction of the axial force received by the transmission helical gear 18 is opposite to the direction of the axial force received by the driving helical gear 17.

[0068] The above has described a detailed description of an embodiment of the present invention, but the content is only the preferred embodiment of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the application of the present invention should still fall within the scope covered by the patent of the present invention.

Claims

1. A direct drive torque motor with a transmission structure, comprising a housing (1), characterized in that: A partition plate (2) and a support frame (20) are arranged inside the housing (1). A stator (5) and a rotor (6) are arranged on one side of the partition plate (2). An output shaft (7) penetrates through the partition plate (2). One end of the output shaft (7) is connected to the rotor (6), and the other end is connected to the support frame (20). A driving helical gear (17) is arranged on the output shaft (7) between the partition plate (2) and the support frame (20). The driving helical gear (17) rotates coaxially with the output shaft (7) and can also move axially along the output shaft (7). Buffer springs (14) of the same type are sleeved on the output shaft (7) on both sides of the driving helical gear (17). A transmission helical gear (18) is rotatably arranged on the partition plate (2) on one side of the driving helical gear (17). The transmission helical gear (18) meshes with the driving helical gear (17). An output helical gear (21) is also arranged on the support frame (20). The output helical gear (21) meshes with the transmission helical gear (18).

2. The direct drive torque motor with a transmission structure according to claim 1, wherein: A transmission groove (9) is arranged on the output shaft (7) between the partition plate (2) and the support frame (20). The extending direction of the transmission groove (9) is the same as the axial direction of the output shaft (7). An assembly hole (28) is arranged on the driving helical gear (17). A transmission block (26) is arranged in the assembly hole (28). The transmission block (26) is located in the transmission groove (9) and is in sliding fit with the transmission groove (9).

3. The direct drive torque motor with a transmission structure according to claim 2, characterized in that: A limiting groove (10) is also arranged on the output shaft (7). The limiting groove (10) is located between two of the transmission grooves (9). The extending direction of the limiting groove (10) is the same as that of the transmission groove (9), and the depth of the limiting groove (10) is greater than that of the transmission groove (9). A stop block (11) is arranged in the middle of the limiting groove (10). Sliding rings (15) are sleeved on the output shaft (7) on both sides of the driving helical gear (17). A limiting block (27) is arranged on the inner side of the sliding ring (15). The limiting block (27) is located in the limiting groove (10).

4. The direct drive torque motor with a transmission structure according to claim 1, characterized in that: A support groove (24) is arranged on the support frame (20). Support blocks (12) are arranged on both the output helical gear (21) and the output shaft (7). The support blocks (12) are in rotational fit with the support groove (24).

5. A direct drive torque motor with a transmission structure according to claim 3, characterized in that: Pressure bearings (13) are also sleeved on the output shaft (7) on both sides of the driving helical gear (17). The buffer spring (14) is located between the pressure bearing (13) and the sliding ring (15), and the sliding ring (15) is in contact with the driving helical gear (17).

6. The direct drive torque motor with a transmission structure according to claim 5, characterized in that: Spring seats (16) are arranged on both the sliding ring (15) and the pressure bearing (13). Both ends of the buffer spring (14) are respectively sleeved on the spring seats (16).

7. The direct drive torque motor with a transmission structure according to claim 1, wherein: The number of the transmission helical gears (18) is at least two and they are evenly distributed around the driving helical gear (17).

8. A direct drive torque motor with a transmission structure according to claim 1, characterized in that: An installation shaft (19) is fixedly arranged on the partition plate (2), and the transmission helical gear (18) is rotatably connected to the partition plate (2) through the installation shaft (19).

9. A direct drive torque motor with a transmission structure according to claim 1, characterized in that: A front cover (25) is arranged at one end of the housing (1). A transmission shaft (22) is fixedly arranged on the output helical gear (21). The free end of the transmission shaft (22) passes through the front cover (25), and a rear cover (8) is arranged at the other end of the housing (1).

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