Electric steering engine for switching action

Abstract

The invention discloses an electric steering engine for switching action, which belongs to the technical field of electric steering engines and comprises a body, a lead screw pair, a speed reducing mechanism and a motor. A magnetic block is installed on a lead screw nut used for motion output, Hall sensors are arranged at the positions, corresponding to the starting position and the ending position of the lead screw nut, of a body so as to sense the in-place motion condition of the lead screw nut, and the switch position change of the lead screw nut is monitored; meanwhile, the speed reducing mechanism is arranged between the motor and the ball screw, the output speed of the motor is reduced through step-by-step speed reduction of the small gear, the duplicate gear and the large gear, and long-stroke large-thrust output is achieved in a limited space.

Description

Technical Field

[0001] This invention belongs to the field of electric servo motor technology, specifically relating to an electric servo motor for switching actions. Background Technology

[0002] With the continuous development of aircraft technology, the types of aircraft are becoming increasingly diverse, and the requirements for actuators of various types of aircraft are also becoming more varied, such as requirements for load capacity, travel range, response speed and installation size.

[0003] In flight control systems, electric servos play a crucial role as core actuators. Currently, the travel range of common general-purpose electric servos on the market is mostly within 110mm. However, for some special aircraft or new flight platforms, the required actuators need to meet the requirements of long-stroke linear output of up to 300mm, far exceeding the design range of conventional electric servos. Existing standardized and serialized products cannot simultaneously meet the performance requirements of long stroke and high thrust within a limited space. Summary of the Invention

[0004] In view of one or more of the above-mentioned defects or improvement needs of the prior art, the present invention provides an electric servo motor for switching action, which can achieve long stroke and large thrust output in a limited space and has a locking function.

[0005] To achieve the above objectives, the present invention provides an electric servo motor for switching operations, comprising a body, a lead screw pair, a reduction mechanism, and a motor; The lead screw assembly includes a lead screw nut and a ball screw; the ball screw is rotatably mounted in the body; one end of the lead screw nut is sleeved on the ball screw, and the other end extends out of the body as an output end; a first magnetic block is provided on the lead screw nut, and a first Hall sensor and a second Hall sensor are respectively provided on the body corresponding to the start position and end position of the movement of the first magnetic block. The motor is arranged parallel to and spaced apart from the ball screw, and is connected to the ball screw through the reduction mechanism; The reduction mechanism includes a first pinion, a double gear, and a first large gear; the first pinion is coaxial with and fixedly connected to the output shaft of the motor; the double gear includes a second large gear and a second pinion, which are coaxial with and fixedly connected, the second large gear meshes with the first pinion, the second pinion meshes with the first large gear, and the first large gear is coaxial with and fixedly connected to the ball screw.

[0006] As a further improvement of the present invention, it also includes an upper cover, which is fixedly connected to one end of the main body, and the deceleration mechanism is disposed between the upper cover and the main body; The first large gear is sleeved on one end of the ball screw near the ball screw, and a first bearing and a second bearing are respectively provided on both sides of the first large gear. The first bearing is fixed in the body, and the second bearing is fixed in the upper cover. One end of the ball screw passes through the first bearing and the second bearing in sequence. A third bearing is provided on the side of the first pinion away from the motor. The third bearing is fixed inside the upper cover, and the end of the first pinion away from the motor passes through the third bearing. The double gear is provided with a fourth bearing and a fifth bearing on both sides respectively. The fourth bearing is fixed in the body and the fifth bearing is fixed in the upper cover. The two ends of the double gear are respectively inserted into the fourth bearing and the fifth bearing.

[0007] As a further improvement of the present invention, it also includes a power failure brake, which is fixedly installed on the upper cover; the end of the first pinion opposite to the motor is coaxially provided with a positioning shaft with a key, which passes through the keyway of the power failure brake so as to lock and unlock the first pinion by turning the power on and off the power of the power failure brake.

[0008] As a further improvement of the present invention, it also includes a brake cover, which is fixedly mounted on the upper cover and covers the power-off brake to encapsulate the power-off brake.

[0009] As a further improvement of the present invention, a lower cover is also included, the lower cover comprising a lower cover body and an inner liner; the lower cover body is fixedly connected to one end of the main body near the lead screw nut; the inner liner is a copper inner liner, which is fixedly disposed on the inner peripheral wall of the lower cover body and sleeved on the output end of the lead screw nut to support the lead screw nut.

[0010] As a further improvement of the present invention, an annular sealing groove is provided on the inner peripheral wall of the lower cover, and a sealing ring is provided in the annular sealing groove to achieve a seal between the lower cover and the lead screw nut.

[0011] As a further improvement of the present invention, a first mounting groove is provided on the outer wall of the main body, the first Hall sensor and the second Hall sensor are disposed in the first mounting groove, and a cover plate is provided corresponding to the first mounting groove to encapsulate the first Hall sensor and the second Hall sensor in the first mounting groove.

[0012] As a further improvement of the present invention, the first magnetic block is provided in multiple ways, and multiple second mounting grooves are provided at intervals on the outer wall of the lead screw nut along its movement direction, and the first magnetic block is installed in the corresponding second mounting groove.

[0013] As a further improvement of the present invention, a transfer shaft is coaxially provided on the side of the ball screw away from the screw nut. One end of the transfer shaft is fixedly connected to the ball screw, and a second magnetic block is fixedly installed on the other end. A rotation sensor is provided corresponding to the second magnetic block. The rotation sensor is coaxially provided with the transfer shaft and fixed on the upper cover for sensing the rotational movement of the second magnetic block.

[0014] As a further improvement of the present invention, a rotating sensor cover is also included, which is fixedly mounted on the upper cover and covers the rotating sensor to encapsulate the rotating sensor.

[0015] The aforementioned improved technical features can be combined with each other as long as they do not conflict with each other.

[0016] In summary, the beneficial effects of the above-described technical solutions conceived by this invention compared with the prior art include: (1) The electric servo motor for switching action of the present invention uses a magnetic block installed on the lead screw nut for motion output and Hall sensors installed on the main body corresponding to the start and end positions of the lead screw nut to sense the position of the lead screw nut and monitor the change of the switch position of the lead screw nut; at the same time, a speed reduction mechanism is set between the motor and the ball screw to reduce the output speed of the motor through the step-by-step speed reduction of the pinion, double gear and large gear, so as to achieve a long stroke and large thrust output in a limited space.

[0017] (2) The electric servo motor for switching action of the present invention has a magnetic block installed at the end of the ball screw and a rotation sensor set on the magnetic block to cooperate with the Hall sensor to achieve precise positioning of the servo motor switch position and precise control of the movement position of the servo motor output end; by adding a power failure brake to the other end of the first pinion fixed to the motor to lock the servo motor when not working, the servo motor has a locking function. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic cross-sectional view of the electric servo motor used for switching action in an embodiment of the present invention; In all the accompanying drawings, the same reference numerals denote the same technical features, specifically: 1. Lead screw pair; 101. Lead screw nut; 102. Ball screw; 2. Sealing ring; 3. Lower cover; 301. Lower cover body; 302. Liner; 4. Body; 5. First Hall sensor; 6. Cover plate; 7. First magnetic block; 8. Second Hall sensor; 9. Motor; 10. First large gear; 11. Double gear; 12. Pin; 13. Upper cover; 14. First small gear; 15. Third bearing; 16. Power failure brake; 17. Brake cover; 18. Rotation sensor; 19. Rotation sensor cover; 20. Second magnetic block; 21. Adapter shaft. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0021] In the description of this invention, it should be understood that, unless otherwise expressly specified and limited, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0022] Furthermore, unless otherwise expressly specified and limited, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise expressly and specifically limited.

[0023] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0024] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "beneath" of the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0025] Example: Please see Figure 1 In a preferred embodiment of the present invention, the electric servo motor for switching action includes a body 4, a lead screw pair 1, a motor 9, and a reduction mechanism, so that the output end of the lead screw pair 1 is driven to move by the motor 9, and the motor 9 is decelerated and output by the reduction mechanism.

[0026] Specifically, such as Figure 1 As described above, in the preferred embodiment, the body 4 is a hollow cylindrical structure with openings at both ends, which provides installation space for other components of the electric servo motor.

[0027] Further, in a preferred embodiment, the lead screw assembly 1 includes a lead screw nut 101 and a ball screw 102; wherein, the ball screw 102 includes balls and a lead screw, the lead screw is rotatably mounted inside the body 4 and is driven by the motor 9 through a reduction mechanism, so that the motor 9 drives the lead screw to rotate along its own axis; one end of the lead screw nut 101 is disposed inside the body 4 and threaded onto the ball screw 102, and the other end extends out of the body 4 as an output end, and the balls are disposed between the lead screw nut 101 and the lead screw, so as to convert the rotation of the lead screw into the linear motion of the lead screw nut 101. This is prior art and will not be described in detail here.

[0028] Meanwhile, a first magnetic block 7 is provided on the outer side wall of the lead screw nut 101, and a first Hall sensor 5 and a second Hall sensor 8 are respectively provided on the body 4 at the starting and ending positions of the first magnetic block 7, so that when the lead screw nut 101 with the first magnetic block 7 moves to face the Hall sensor, the position of the lead screw nut 101 can be monitored by sensing the change in the magnetic field.

[0029] Preferably, a first mounting groove extending axially is provided on the outer wall of the main body 4, the first Hall sensor 5 and the second Hall sensor 8 are fixedly installed in the first mounting groove, and a cover plate 6 is provided corresponding to the first mounting groove so as to encapsulate the first Hall sensor 5 and the second Hall sensor 8 in the first mounting groove through the cover plate 6, thereby protecting the Hall sensor and its related wires.

[0030] Preferably, there are multiple first magnetic blocks 7, and multiple second mounting slots are provided at intervals on the outer wall of the lead screw nut 101 along its movement direction corresponding to the multiple first magnetic blocks 7. Each first magnetic block 7 is installed in a corresponding second mounting slot to provide magnetic field changes at different positions during the output process of the lead screw nut 101.

[0031] Preferably, a coaxial adapter shaft 21 is provided on the side of the ball screw 102 away from the screw nut 101, and a threaded hole is provided on the corresponding side of the ball screw 102. One end of the adapter shaft 21 is fixedly installed in the threaded hole of the ball screw 102, and a second magnetic block 20 is fixedly installed on the other end. A rotation sensor 18 is provided corresponding to the second magnetic block 20. The rotation sensor 18 is coaxially arranged with the adapter shaft 21 and is used to sense the rotational movement of the second magnetic block 20, thereby monitoring the rotational movement of the ball screw 102.

[0032] Preferably, an upper cover 13 is fixedly installed at one end of the body 4, and a lower cover 3 is fixedly installed at the other end, so that the lead screw assembly 1 is encapsulated in the body 4 by the upper cover 13 and the lower cover 3, and corresponding installation space is provided for other components.

[0033] like Figure 1 As shown, the upper cover 13 is installed on one end of the body 4 near the ball screw 102. The rotation sensor 18 is fixedly installed on the upper cover 13, and a rotation sensor cover 19 is provided corresponding to the rotation sensor 18. The rotation sensor cover 19 is fixedly installed on the upper cover 13 and covers the rotation sensor 18 to encapsulate the rotation sensor 18.

[0034] Meanwhile, corresponding to the rotatable installation of the ball screw 102 within the body 4, a first bearing and a second bearing are provided. The first bearing is fixed inside the body 4, and the second bearing is fixed inside the upper cover 13. One end of the ball screw 102 passes through the first bearing and the second bearing in sequence, so as to provide rotational support for the ball screw 102 through the first bearing and the second bearing.

[0035] Correspondingly, the lower cover 3 is installed at one end of the body 4 near the lead screw nut 101. The lower cover 3 includes a lower cover body 301 and an inner liner 302. The lower cover body 301 is fixedly connected to one end of the body 4 near the lead screw nut 101. The inner liner 302 is made of copper and is fixed to the inner circumferential wall of the lower cover body 301 and sleeved on the output end of the lead screw nut 101 to support the lead screw nut 101 and make it move stably. The self-lubricating properties of the copper inner liner 302 reduce the friction between the lead screw nut 101 and the lower cover 3, which facilitates the output of the lead screw nut 101.

[0036] Preferably, a sealing groove is provided on the inner wall of the lower cover 301, and a sealing ring 2 is embedded in the sealing groove to achieve a seal between the lower cover 3 and the lead screw nut 101, so as to prevent water and other foreign objects from entering the servo motor during use.

[0037] Furthermore, in the preferred embodiment, the motor 9 is fixedly mounted on the body 4, and the output shaft of the motor 9 is parallel to the axis of the lead screw pair 1. A reduction mechanism is provided between the motor 9 and the lead screw pair 1 so that the output speed of the motor 9 is reduced by the reduction mechanism, and the lead screw pair 1 is driven to output stably. Specifically, the reduction mechanism is housed within the upper cover 13 and includes a first pinion 14, a first large gear 10, and a double gear 11. The first pinion 14 is coaxially and fixedly connected to the output shaft of the motor 9 via a pin 12. The double gear 11 includes a second large gear and a second pinion coaxially arranged and fixedly connected. The second large gear meshes with the first pinion 14, and the second pinion meshes with the first large gear 10. The first large gear 10 is coaxially and fixedly connected to the ball screw 102. Figure 1 As shown, the first large gear 10 is sleeved on the ball screw 102, and the first bearing and the second bearing are respectively located on both sides of the first large gear 10. Thus, the output speed of the motor 9 is reduced through multi-stage reduction of the first small gear 14, the first large gear 10 and the double gear 11.

[0038] Preferably, a third bearing, a fourth bearing, and a fifth bearing are also provided corresponding to the first pinion 14 and the double gear 11; wherein the third bearing is fixedly installed inside the upper cover 13 and is located on the side of the first pinion 14 away from the motor 9, and the end of the first pinion 14 away from the motor 9 passes through the third bearing, so that the motor 9 and the third bearing provide symmetrical support for the first pinion 14; the fourth bearing is fixedly installed inside the body 4, and the fifth bearing is fixedly installed inside the upper cover 13, and the fourth bearing and the fifth bearing are respectively located on both sides of the double gear 11, and the two ends of the double gear 11 pass through the fourth bearing and the fifth bearing respectively, so as to provide symmetrical support for the double gear 11.

[0039] Preferably, the corresponding deceleration mechanism is further provided with a power failure brake 16, which is fixedly installed on the upper cover 13 corresponding to the first pinion 14. A positioning shaft with a key is fixedly provided on the end of the first pinion 14 away from the motor 9. The positioning shaft passes through the keyway of the power failure brake 16 so as to lock and unlock the first pinion 14 by turning the power on and off the power to the power failure brake 16.

[0040] Understandably, in actual use, when the power-off brake 16 is energized, the power-off brake 16 unlocks, and the first pinion 14 can move with the motor 9, outputting torque, which in turn causes the ball screw 102 to rotate through the reduction mechanism, thereby causing the screw nut 101 to output thrust or pull force; correspondingly, when the power-off brake 16 is de-energized, the power-off brake 16 locks, locking the first pinion 14, preventing the first pinion 14 from moving with the motor 9, and thus locking the output end of the screw nut 101 through the reduction mechanism, thereby locking the electric servo motor.

[0041] Preferably, a brake cover 17 is also provided for the power failure brake 16. It is fixedly installed on the upper cover 13 and covers the power failure brake 16 to form a relatively closed space between it and the upper cover 13, thereby encapsulating the power failure brake 16 and protecting the power failure brake 16 and its related wires.

[0042] The electric servo motor for switching action in this invention can achieve 15000N thrust and 300mm stroke within a limited envelope volume, and has a power failure self-locking function. At the same time, it can monitor the switching position change of the lead screw nut according to the Hall sensor, and accurately locate the switching position of the servo motor through the rotation sensor.

[0043] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An electric servo motor for switching operations, characterized in that, Includes the main body, lead screw pair, reduction mechanism and motor; The lead screw assembly includes a lead screw nut and a ball screw; the ball screw is rotatably mounted in the body; one end of the lead screw nut is sleeved on the ball screw, and the other end extends out of the body as an output end; a first magnetic block is provided on the lead screw nut, and a first Hall sensor and a second Hall sensor are respectively provided on the body corresponding to the start position and end position of the movement of the first magnetic block. The motor is arranged parallel to and spaced apart from the ball screw, and is connected to the ball screw through the reduction mechanism; The reduction mechanism includes a first pinion, a double gear, and a first large gear; the first pinion is coaxial with and fixedly connected to the output shaft of the motor; the double gear includes a second large gear and a second pinion, which are coaxial with and fixedly connected, the second large gear meshes with the first pinion, the second pinion meshes with the first large gear, and the first large gear is coaxial with and fixedly connected to the ball screw.

2. The electric servo motor for switching action according to claim 1, characterized in that, It also includes an upper cover, which is fixedly connected to one end of the main body, and the deceleration mechanism is disposed between the upper cover and the main body; The first large gear is sleeved on one end of the ball screw near the ball screw, and a first bearing and a second bearing are respectively provided on both sides of the first large gear. The first bearing is fixed in the body, and the second bearing is fixed in the upper cover. One end of the ball screw passes through the first bearing and the second bearing in sequence. A third bearing is provided on the side of the first pinion away from the motor. The third bearing is fixed inside the upper cover, and the end of the first pinion away from the motor passes through the third bearing. The double gear is provided with a fourth bearing and a fifth bearing on both sides. The fourth bearing is fixed in the body and the fifth bearing is fixed in the upper cover. The two ends of the double gear pass through the fourth bearing and the fifth bearing, respectively.

3. The electric servo motor for switching action according to claim 2, characterized in that, It also includes a power failure brake, which is fixedly installed on the upper cover; the first pinion is coaxial with the end opposite to the motor and is fixedly provided with a positioning shaft with a key, which passes through the keyway of the power failure brake so as to lock and unlock the first pinion by turning the power on and off the power of the power failure brake.

4. The electric servo motor for switching action according to claim 3, characterized in that, It also includes a brake cover, which is fixedly mounted on the upper cover and covers the power-off brake to encapsulate the power-off brake.

5. The electric servo motor for switching action according to claim 1, characterized in that, It also includes a lower cover, which includes a lower cover body and an inner liner; the lower cover body is fixedly connected to one end of the main body near the lead screw nut; the inner liner is a copper liner, which is fixedly disposed on the inner peripheral wall of the lower cover body and sleeved on the output end of the lead screw nut to support the lead screw nut.

6. The electric servo motor for switching action according to claim 5, characterized in that, An annular sealing groove is provided on the inner peripheral wall of the lower cover, and a sealing ring is provided in the annular sealing groove to achieve a seal between the lower cover and the lead screw nut.

7. The electric servo motor for switching action according to any one of claims 1 to 6, characterized in that, A first mounting groove is provided on the outer wall of the main body. The first Hall sensor and the second Hall sensor are disposed in the first mounting groove, and a cover plate is provided corresponding to the first mounting groove to encapsulate the first Hall sensor and the second Hall sensor in the first mounting groove.

8. The electric servo motor for switching action according to claim 7, characterized in that, The first magnetic block is configured in multiple ways, and multiple second mounting slots are provided at intervals on the outer wall of the lead screw nut along its movement direction, and the first magnetic block is installed in the corresponding second mounting slot.

9. The electric servo motor for switching action according to claim 2, characterized in that, A transfer shaft is coaxially arranged on the side of the ball screw away from the screw nut. One end of the transfer shaft is fixedly connected to the ball screw, and a second magnetic block is fixedly installed on the other end. A rotation sensor is arranged corresponding to the second magnetic block. The rotation sensor is coaxially arranged with the transfer shaft and fixed on the upper cover to sense the rotational movement of the second magnetic block.

10. The electric servo motor for switching action according to claim 9, characterized in that, It also includes a rotating sensor cover, which is fixedly mounted on the upper cover and covers the rotating sensor to encapsulate the rotating sensor.

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