CN117175844A - Electric differential actuator - Google Patents
Electric differential actuator Download PDFInfo
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- CN117175844A CN117175844A CN202310988484.4A CN202310988484A CN117175844A CN 117175844 A CN117175844 A CN 117175844A CN 202310988484 A CN202310988484 A CN 202310988484A CN 117175844 A CN117175844 A CN 117175844A
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- 239000003638 chemical reducing agent Substances 0.000 description 1
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Abstract
The application provides an electric differential actuator, which comprises a shell, a differential adjusting component and a motor, wherein the differential adjusting component is accommodated in the shell; the differential adjusting component comprises an input rod and an output rod, the input rod is positioned in the shell, and the output rod is connected with the input rod, and can be driven to move along the axial direction of the input rod when the input rod rotates; the motor comprises a stator and a rotor, wherein the stator is fixed in the shell, the rotor is fixedly connected with the input rod and coaxially arranged, the length of the rotor along the axial direction of the input rod is greater than the axial length of the stator, and the length of the stator projected on the rotor along the axial direction is kept unchanged during the period that the input rod is driven to rotate and move by the rotor. The scheme integrates the shaft of the input rod and the motor shaft, and sets the length of the rotor to be longer than that of the stator, so that the motor linkage and control are not affected even if the input shaft moves forwards and backwards in rotation; the whole product is rigidly linked, the parts of the scheme are fewer, the size is smaller, the cost is lower, the control is easy, and no mechanical back clearance exists.
Description
Technical Field
The application relates to the field of actuators, in particular to an electric differential actuator.
Background
The electric actuator has different requirements in different application scenes, and in some application scenes, the control precision of the actuator is required, and the actuator is required to have larger thrust, so that the electric actuator is difficult to design. Taking the application field of coating as an example, the coating die head comprises an upper die head, a lower die head and a clamped gasket, in the coating process, the thickness of the coating is easy to change and is uneven due to the influence of factors such as slurry temperature or viscosity, and the thickness of the coating needs to be adjusted.
Most of the current electric coating die motors are realized by using a stepping motor, a single trapezoid/ball screw and a linear encoder, and as the coating process has a final control precision requirement reaching mu level and needs larger thrust, the single screw lead is difficult to be made too small, so that the motor torque requirement is high, a speed reducing mechanism is usually added, and unavoidable backlash exists in a speed reducer and other transmission parts, so that the control precision problem caused by backlash is solved, and an expensive linear encoder is needed to carry out auxiliary feedback to achieve the target control precision.
When the differential screw thread is adopted as a core transmission part, the effect equivalent to a very small lead screw is realized through the differential screw thread principle, so that the requirement on the torque of a motor is reduced, and a speed reducing mechanism is not required to be added. However, the differential screw thread brings another problem at the same time, when the differential screw thread is twisted, the input shaft moves forward and backward while rotating, and the motor cannot be directly connected for transmission.
Disclosure of Invention
The application provides an electric differential actuator, which comprises a shell, a differential adjusting component and a motor, wherein the differential adjusting component is accommodated in the shell; the differential adjusting component comprises an input rod and an output rod, the input rod is positioned in the shell, and the output rod is connected with the input rod and can be driven to move along the axial direction of the input rod when rotating; the motor comprises a stator and a rotor, wherein the stator is fixed in the shell, the rotor is fixedly connected with the input rod and coaxially arranged, the length of the rotor along the axial direction of the input rod is greater than the axial length of the stator, and the length of the stator projected on the axial direction of the rotor is kept unchanged during the period that the input rod is driven to rotate and move by the rotor.
Further, the stator is fixed on the inner side wall of the shell, and part of the rotor is surrounded by the stator.
Further, the input rod is surrounded by the mover, and an end of the input rod remote from the output rod is disposed through the mover.
Further, the electric differential actuator further comprises a hand adjusting piece, the hand adjusting piece is connected to one end, far away from the output rod, of the shell, and the input rod is fixedly connected with the hand adjusting piece.
Further, the electric differential actuator further comprises a rotary coding unit, the rotary coding unit comprises a connecting shell connected to one end of the shell away from the output rod and a rotary coder arranged in the connecting shell, a first part of the rotary coder is arranged on the input rod, a second part of the rotary coder is arranged on the connecting shell, and the first part and the second part are jointly used for measuring the rotation parameter of the input rod.
Further, the differential adjusting assembly further comprises a fixing nut fixedly connected to the shell, the input rod is provided with a first connecting portion and a second connecting portion located on one side of the first connecting portion, the diameter of the first connecting portion is larger than that of the second connecting portion, the first connecting portion is in threaded connection with the fixing nut, and the second connecting portion is in threaded connection with one end of the output rod extending into the fixing nut.
Further, the input rod comprises a third connecting portion connected with the first connecting portion, the third connecting portion and the second connecting portion are located at two ends of the first connecting portion respectively, the third connecting portion is fixedly connected with the rotor, and the diameter of the third connecting portion is smaller than that of the first connecting portion.
Further, a supporting piece is arranged in the shell, is positioned between the first connecting portion and the rotor, and supports the third connecting portion through a bearing.
Further, a bearing is arranged in the shell far away from one end of the output rod, and the input rod passes through the rotor to be connected with the bearing and passes through the bearing.
Further, an annular groove is formed in the outer wall of the end, away from the output rod, of the shell, and therefore required elements can be conveniently installed.
The embodiment adopts a customized motor integrated design, integrates the shaft of the input rod with the motor shaft, and sets the length of the motor rotor to be longer than that of the motor stator (the length of the conventional motor stator is equal to that of the rotor magnet), so that the motor linkage and control are not affected even if the input shaft moves forwards and backwards in rotation; the whole product is rigidly linked, no system back clearance exists, and compared with the existing scheme, the scheme has fewer parts, smaller size, lower cost, easy control and no mechanical back clearance.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present application, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic perspective view of an electric differential actuator according to an embodiment of the application.
Fig. 2 is a schematic cross-sectional view of the electric differential actuator of fig. 1.
Fig. 3 is a schematic cross-sectional view of an electric differential actuator according to another embodiment of the present application.
Fig. 4 is a schematic cross-sectional view of an electric differential actuator according to another embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the application are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The application will now be described in further detail by way of specific examples of embodiments in connection with the accompanying drawings.
Referring to fig. 1-2, an embodiment of the present application provides an electric differential actuator 100, which includes a housing 10, a differential adjusting assembly 20 accommodated in the housing 10, and a motor 30. Wherein, differential adjusting assembly 20 includes an input rod 21 located in housing 10 and an output rod 22 connected to input rod 21, and when input rod 21 is driven to rotate, output rod 22 is driven to move along the axial direction of input rod 21. The motor 30 includes a stator 31 and a mover 32, wherein the stator 31 is fixed in the housing 10, the mover 32 is fixedly connected with the input rod 21 and coaxially disposed, and the length of the mover 32 along the axial direction of the input rod 21 is greater than the axial length of the stator 31, so that the length of the stator 31 projected on the mover 32 along the axial direction remains unchanged during the period that the input rod 21 is driven to rotate and move by the mover 32.
That is, when the mover 32 drives the input rod 21 to rotate, the output rod 21 is driven to move along the axial direction of the input rod 21, the input rod 21 is also driven to move along the axial direction of the input rod 21, the mover 32 is also driven to move along the axial direction of the mover 32 relative to the stator 31, so that the acting force between the mover 32 and the stator 31 is not changed during the movement of the mover 32, and therefore, the length of the mover 32 along the axial direction of the input rod 21 needs to be greater than the axial length of the stator 31, so that the length of the stator 31 projected on the mover 32 along the axial direction during the movement of the mover 32 remains unchanged.
The embodiment adopts a customized motor integrated design, integrates the input shaft of the differential adjusting component with the motor shaft, and sets the length of the motor rotor longer than that of the motor stator (the length of the conventional motor stator is equal to that of the rotor magnet), so that even if the input shaft moves forwards and backwards in rotation, the motor linkage and control are not affected; the whole product is rigidly linked, no system back clearance exists, and compared with the existing scheme, the scheme has fewer parts, smaller size, lower cost, easy control and no mechanical back clearance.
In one embodiment, the stator 31 is fixed to the inner side wall of the housing 10, and the mover 32 is surrounded by the stator 31, that is, a part of the mover 32 is surrounded by the stator 31. By the design that the rotor 32 is surrounded by the stator 31, the rotor 32 is not easily influenced by the shell 10 when in motion, and the operation is more stable.
In one embodiment, the input rod 21 is also surrounded by the mover 32, so that the mover 32 is not easy to shake and is more stable when driving the input rod 21 to rotate. Moreover, the end of the input rod 21 far away from the output rod 22 passes through the mover 32, and the input rod 21 passing through the mover 32 can be connected with other elements to enrich the functions of the product.
In a specific embodiment, the electric differential actuator 100 further includes a hand adjusting member 40, the hand adjusting member 40 is connected to an end of the housing 10 away from the output rod 22, and the input rod 21 penetrating the mover 32 may be fixedly connected to the hand adjusting member 40, so that the electric differential actuator 100 may adjust the movement of the output rod 22 in an electric manner or may adjust the movement of the output rod 22 in a manual manner.
Referring to fig. 3, in another embodiment, the electric differential actuator 100 further includes a rotary encoder unit 50, wherein the rotary encoder unit 50 includes a connection housing 51 connected to an end of the housing 10 remote from the output shaft 22 and a rotary encoder 52 disposed in the connection housing 51, a first portion 521 of the rotary encoder 52 is mounted on the input shaft 21, a second portion 522 is mounted on the connection housing 51, and the first portion 521 and the second portion 522 cooperate to measure a rotation parameter of the input shaft 21.
The first portion 521 may be a hollow ring magnetic braid, and the second portion 522 may be a magnetic encoder, where the magnetic ring induced by the magnetic encoder is thickened, so that the control of the motor 30 is not affected even when the input shaft 21 rotates and moves back and forth.
In one embodiment, the differential adjusting assembly 20 further includes a fixing nut 23, the fixing nut 23 is fixedly connected to the housing 10, the input rod 21 has a first connection portion 211 and a second connection portion 212 located at one side of the first connection portion 211, the diameter of the first connection portion 211 is larger than that of the second connection portion 212, the first connection portion 211 is in threaded connection with the fixing nut 23, and the second connection portion 212 is in threaded connection with one end of the output rod 22 extending into the fixing nut 23.
In one embodiment, the input rod 21 includes a third connecting portion 213 connected to the first connecting portion 211, the third connecting portion 213 and the second connecting portion 212 are respectively located at two ends of the first connecting portion 211, the third connecting portion 213 is fixedly connected to the mover 32, and a diameter of the third connecting portion 213 is smaller than that of the first connecting portion 211, so that the size of the motor 30 can be smaller, and an overall size of the product is relatively smaller.
Referring to fig. 4, in one embodiment, a supporting member 13 is disposed in the housing 10, and the supporting member 13 is located between the first connecting portion 211 and the mover 32 and supports the third connecting portion 213 through the bearing 131, so that the rotation of the input rod 21 is more stable.
In one embodiment, the bearing 15 is disposed in the casing 10 at the end far away from the output rod 22, and the input rod 21 passes through one end of the mover 32, is rotatably connected with the bearing 15, and passes through the bearing 15, so that the rotation and movement of the input rod 21 are more stable, and the adjustment performance of the output rod 22 is improved. Wherein the input rod 21 is disposed through the bearing 15 such that the input rod 21 is always in rotationally coupled relation to the bearing 15 during movement of the input rod 21.
In one embodiment, the outer wall of the end of the housing 10 remote from the output rod 22 is provided with an annular groove 17 to facilitate the installation of the required components. The diameter of the outer wall of the annular groove 17 is smaller than that of the outer wall of the other parts of the shell 10, so that after the required elements are installed at the annular groove 17, the outer wall of the required elements is equivalent to the diameter of the outer wall of the other parts of the shell 10, the overall outer diameter of the product is equivalent, and the storage and the use of the product are facilitated.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted", "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.
Claims (10)
1. An electric differential actuator, characterized by: the electric differential actuator comprises a shell, a differential adjusting component and a motor, wherein the differential adjusting component is accommodated in the shell;
the differential adjusting component comprises an input rod and an output rod, the input rod is positioned in the shell, and the output rod is connected with the input rod and can be driven to move along the axial direction of the input rod when rotating;
the motor comprises a stator and a rotor, wherein the stator is fixed in the shell, the rotor is fixedly connected with the input rod and coaxially arranged, the length of the rotor along the axial direction of the input rod is greater than the axial length of the stator, and the length of the stator projected on the axial direction of the rotor is kept unchanged during the period that the input rod is driven to rotate and move by the rotor.
2. The electric differential actuator as defined in claim 1, wherein: the stator is fixed on the inner side wall of the shell, and part of the rotor is surrounded by the stator.
3. The electric differential actuator as defined in claim 2, wherein: the input rod is surrounded by the mover, and an end of the input rod, which is far away from the output rod, is disposed through the mover.
4. An electric differential actuator as defined in claim 3, wherein: the electric differential actuator further comprises a hand adjusting piece, the hand adjusting piece is connected to one end, far away from the output rod, of the shell, and the input rod is fixedly connected with the hand adjusting piece.
5. An electric differential actuator as defined in claim 3, wherein: the electric differential actuator further comprises a rotary coding unit, the rotary coding unit comprises a connecting shell and a rotary coder, the connecting shell is connected to the shell and is far away from one end of the output rod, the rotary coder is arranged in the connecting shell, a first part of the rotary coder is arranged on the input rod, a second part of the rotary coder is arranged on the connecting shell, and the first part and the second part are jointly used for measuring the rotation parameters of the input rod.
6. The electric differential actuator as defined in claim 1, wherein: the differential adjusting assembly further comprises a fixing nut, the fixing nut is fixedly connected to the shell, the input rod is provided with a first connecting portion and a second connecting portion located on one side of the first connecting portion, the diameter of the first connecting portion is larger than that of the second connecting portion, the first connecting portion is in threaded connection with the fixing nut, and the second connecting portion is in threaded connection with one end of the output rod, which extends into the fixing nut.
7. The electric differential actuator according to claim 6, wherein: the input rod comprises a third connecting part connected with the first connecting part, the third connecting part and the second connecting part are respectively positioned at two ends of the first connecting part, the third connecting part is fixedly connected with the rotor, and the diameter of the third connecting part is smaller than that of the first connecting part.
8. The electric differential actuator according to claim 7, wherein: the casing is internally provided with a supporting piece, and the supporting piece is positioned between the first connecting part and the rotor and supports the third connecting part through a bearing.
9. The electric differential actuator as defined in claim 1, wherein: the inside of the one end of casing keeping away from the output pole is equipped with the bearing, the input pole passes the active cell is connected with this bearing to pass this bearing setting.
10. The electric differential actuator as defined in claim 1, wherein: an annular groove is formed in the outer wall of one end, away from the output rod, of the shell, and required elements are convenient to install.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310988484.4A CN117175844A (en) | 2023-08-08 | 2023-08-08 | Electric differential actuator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310988484.4A CN117175844A (en) | 2023-08-08 | 2023-08-08 | Electric differential actuator |
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| Publication Number | Publication Date |
|---|---|
| CN117175844A true CN117175844A (en) | 2023-12-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310988484.4A Pending CN117175844A (en) | 2023-08-08 | 2023-08-08 | Electric differential actuator |
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| CN (1) | CN117175844A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117713398A (en) * | 2024-02-05 | 2024-03-15 | 西南交通大学 | High-precision direct-drive electromechanical actuator |
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2023
- 2023-08-08 CN CN202310988484.4A patent/CN117175844A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117713398A (en) * | 2024-02-05 | 2024-03-15 | 西南交通大学 | High-precision direct-drive electromechanical actuator |
| CN117713398B (en) * | 2024-02-05 | 2024-05-07 | 西南交通大学 | High-precision direct-drive electromechanical actuator |
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