A servo position feedback device

Abstract

The present invention provides a servo position feedback device, comprising a sector gear assembly, a feedback gear assembly, a magnet assembly and a displacement sensor circuit assembly, wherein the sector gear assembly is fixed on the output shaft of the servo, the feedback gear in the feedback gear assembly is meshed with the sector gear in the sector gear assembly, the magnet assembly is fixedly connected with the feedback gear assembly to keep synchronous rotation, the displacement sensor circuit assembly is aligned with the magnet in the magnet assembly at a micro pitch, and the operating state of the servo output shaft is obtained by measuring the motion state of the magnet. The present invention has advantages such as high overload impact resistance, high reliability, high sensitivity, and small size, and has low manufacturing cost, and is easy to apply to extended-range guided artillery shells or electromagnetic shells and other weapons and equipment that need to be equipped in large quantities and used on a large scale in wars.

Description

Technical Field

[0001] The invention belongs to the technical field of steering gear design, and in particular relates to a steering gear position feedback device. Background Art

[0002] The extended-range rolling guided projectile is a high-speed flying spinning projectile launched by traditional artillery or electromagnetic gun. It usually adopts dual-channel control to synchronously control the two symmetrical duck rudder surfaces. Each pair of rudder surfaces implements synchronous deflection. The guided projectile rotates around its longitudinal axis and changes the position of the control mechanism to generate control force in any direction in space. The servo position feedback device is an important functional component of the servo, which directly affects the execution of the servo command, and then affects the flight attitude control of the whole projectile and the accuracy of hitting the target. Since the guided projectile is a high-speed spinning projectile launched by artillery or electromagnetic gun, the overload impact is between 15000g and 20000g. The servo position feedback device needs to meet the mechanical environment conditions of large impact overload conditions and high-speed rotation conditions without product damage, and the performance indicators need to be reliable and normal. The traditional conductive plastic potentiometer is far from meeting the requirements of 20000g high impact overload. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a steering gear position feedback device. The present invention can solve the problems existing in the prior art.

[0004] The technical solution of the present invention:

[0005] A servo position feedback device comprises a sector gear assembly, a feedback gear assembly, a magnet assembly and a displacement sensor circuit assembly, wherein the sector gear assembly is fixed on the output shaft of the servo, the feedback gear in the feedback gear assembly is meshed with the sector gear in the sector gear assembly, the magnet assembly is fixedly connected with the feedback gear assembly to keep synchronous rotation, the displacement sensor circuit assembly is aligned with the magnet in the magnet assembly at a micro pitch, and the operating state of the servo output shaft is obtained by measuring the motion state of the magnet.

[0006] Furthermore, the sector gear assembly includes a sector gear and a sector gear fixing and fastening nail. The sector gear is installed on the output shaft of the servo through the sector gear fixing and fastening nail and rotates coaxially with the output shaft.

[0007] Furthermore, the feedback gear assembly includes a feedback gear, a small feedback gear bearing, a feedback gear support shaft, a large feedback gear bearing and a large feedback gear bearing support plate. The small feedback gear bearing, the feedback gear and the large feedback gear bearing are sequentially installed on the feedback gear support shaft, the large feedback gear bearing is installed on the large feedback gear bearing support plate, and the large feedback gear bearing support plate is fixed on the servo body.

[0008] Furthermore, the magnet assembly includes a magnet and a magnet holder, the magnet holder is fixed on the feedback gear support shaft, and the magnet is fixed on the magnet holder.

[0009] Furthermore, the displacement sensor circuit assembly includes a displacement sensor circuit and a bracket, the displacement sensor circuit is fixed on the bracket and can measure the displacement state of the magnet, and the bracket is fixed on the main housing of the steering gear.

[0010] Preferably, the bracket is made of titanium alloy material.

[0011] Preferably, the distance between the magnet and the displacement sensor circuit is 1 to 1.5 mm.

[0012] The beneficial effects of the present invention compared with the prior art are as follows:

[0013] (1) The present invention has a simple structure and is a non-contact measurement, which effectively reduces the transmission effect of moving parts on the sensor during the impact process;

[0014] (2) The present invention has the advantages of high overload impact resistance, high reliability, high sensitivity, small size, etc., and has a low manufacturing cost. It is easy to apply to extended-range guided artillery shells or electromagnetic shells and other weapons and equipment that need to be equipped in large quantities and used on a large scale in war. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The included drawings are used to provide a further understanding of the embodiments of the present invention, which constitute a part of the specification, are used to illustrate the embodiments of the present invention, and together with the text description, explain the principles of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 A schematic diagram of a three-dimensional structure of a steering gear position feedback device provided in an embodiment of the present invention is shown;

[0017] Figure 2 A cross-sectional schematic diagram of a steering gear position feedback device provided according to an embodiment of the present invention is shown.

[0018] The above drawings contain the following reference numerals:

[0019] 11. Output shaft bearing; 12. Servo output shaft; 13. Fan gear fixing fastener; 14. Fan gear; 15. Feedback gear small bearing; 16. Feedback gear; 17. Feedback gear large bearing; 18. Feedback gear large bearing support plate; 19. Magnet holder; 20. Displacement sensor circuit assembly; 21. Magnet; 22. Servo main housing. DETAILED DESCRIPTION

[0020] It should be noted that, in the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0022] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0023] like Figure 1As shown, according to an embodiment of the present invention, a servo position feedback device is provided, comprising a sector gear assembly, a feedback gear assembly, a magnet assembly and a displacement sensor circuit assembly, wherein the sector gear assembly is fixed on the output shaft of the servo, the feedback gear in the feedback gear assembly is meshed with the sector gear in the sector gear assembly, the magnet assembly is fixedly connected to the feedback gear assembly to maintain synchronous rotation, the displacement sensor circuit assembly is micro-aligned with the magnet in the magnet assembly, and the operating state of the servo output shaft is obtained by measuring the motion state of the magnet.

[0024] Further in one embodiment, the sector gear assembly includes a sector gear and a sector gear fixing fastening nail, and the sector gear is installed on the output shaft of the servo engine through the sector gear fixing fastening nail and rotates coaxially with the output shaft.

[0025] Further in one embodiment, the feedback gear assembly includes a feedback gear, a small feedback gear bearing, a feedback gear support shaft, a large feedback gear bearing and a large feedback gear bearing support plate, the small feedback gear bearing, the feedback gear and the large feedback gear bearing are sequentially mounted on the feedback gear support shaft, the large feedback gear bearing is mounted on the large feedback gear bearing support plate, and the large feedback gear bearing support plate is fixed on the servo body.

[0026] In a further embodiment, the magnet assembly includes a magnet and a magnet holder, the magnet holder is fixed on the feedback gear support shaft, and the magnet is fixed on the magnet holder. Preferably, a magnet mounting fixing groove is provided on the magnet holder, which is a cylindrical structure, which not only follows the shape of the magnet, but also ensures the installation strength and rigidity of the magnet under impact conditions.

[0027] In a further embodiment, the displacement sensor circuit assembly includes a displacement sensor circuit and a bracket, the displacement sensor circuit is fixed on the bracket, and can measure the displacement state of the magnet, and the bracket is fixed on the main housing of the steering gear. The design of the bracket is conducive to the glue filling of the circuit assembly, so as to solve the problem of impact overload resistance of the displacement sensor circuit assembly.

[0028] Preferably in one embodiment, the bracket is made of titanium alloy material to avoid magnetic interference.

[0029] Preferably, in one embodiment, the distance between the magnet and the displacement sensor circuit is 1 to 1.5 mm. Non-contact measurement effectively avoids direct connection between the transmission device and the sensitive measurement components, avoids the impact on the displacement sensor circuit measurement, and improves the measurement accuracy.

[0030] In order to have a further understanding of the steering gear position feedback device provided by the present invention, a detailed description is given below in conjunction with specific examples and drawings.

[0031] In a dual-axis combined servo system, Figure 1 and Figure 2 As shown, a high-impact resistant servo position feedback device is composed of 13 sector gear fixing fastening nails, 14 sector gears, 15 feedback gear small bearing, 16 feedback gear, 17 feedback gear large bearing, 18 feedback gear large bearing support plate, 19 magnet holder, 20 displacement sensor circuit assembly, 21 magnet, 22 servo main housing and other components.

[0032] The 12 servo output shaft is fixed to the 22 servo main housing through two 11 output shaft bearings, and the 14 sector gear is fixed to the output shaft through the 13 sector gear fixing fastener. The sector gear and the output shaft are assembled by screws after the shaft hole is sleeved, which not only ensures the concentric rotation of the sector gear and the output shaft, but also improves the assembly strength, so that it can meet the large impact overload greater than 20000g. One end of the 16 feedback gear is fixedly supported by the 15 feedback gear small bearing and the other end by the 17 feedback gear large bearing. The feedback gear large bearing is fixed to the 22 servo main housing through the 18 feedback gear large bearing support plate. The center hole distance on the main housing is used to ensure the high-precision meshing and transmission transmission of the 16 feedback gear and the 14 sector gear. The 19 magnet holder is fixed to the gear shaft at the large bearing support end of the 16 feedback gear through a threaded connection, and the two are ensured to rotate synchronously after being fastened. The magnet 21 is bonded and fixed in the magnet holder 19. The magnet mounting and fixing groove on the magnet holder is a cylindrical structure, which not only follows the shape of the magnet, but also ensures the installation strength and rigidity of the magnet under impact conditions. After the magnet is installed and fixed on the magnet holder, the two are rigidly connected and rotate synchronously. The displacement sensor circuit assembly 20 is fixed on the top of the magnet. The gap between the two is about 1`1.5mm. It is a non-contact measurement, which effectively avoids the direct connection between the transmission device and the sensitive measurement components. The displacement sensor circuit assembly is installed in a titanium alloy bracket. On the one hand, it avoids magnetic interference, and on the other hand, it is conducive to the glue filling of the circuit assembly to solve the problem of impact overload resistance of the displacement sensor circuit assembly. The displacement sensor circuit assembly 20 is fixed on the main housing of the servo 22, and the installation is stable and reliable. Since the servo is a dual-axis parallel structure, the two relative output shafts rotate synchronously, so a set of servos only needs two sets of position feedback devices.

[0033] In summary, the servo position feedback device of the present invention has the advantages of high overload impact resistance, high reliability, high sensitivity, small size, etc. It has a simple structure and is non-contact measurement, which effectively reduces the transmission influence of moving parts on the sensor during the impact process. It has a low manufacturing cost and is easy to apply to extended-range guided artillery shells or electromagnetic shells and other weapons and equipment that need to be equipped in large quantities and used on a large scale in wars.

[0034] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0035] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0036] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A steering gear position feedback device, characterized in that: It includes a sector gear assembly, a feedback gear assembly, a magnet assembly and a displacement sensor circuit assembly. The sector gear assembly is fixed on the output shaft of the servo, the feedback gear in the feedback gear assembly is meshed with the sector gear in the sector gear assembly, the magnet assembly is fixedly connected with the feedback gear assembly to keep synchronous rotation, the displacement sensor circuit assembly is aligned with the magnet in the magnet assembly at a micro-pitch, and the operating state of the servo output shaft is obtained by measuring the motion state of the magnet.

2. A steering gear position feedback device according to claim 1, characterized in that: The sector gear assembly comprises a sector gear and a sector gear fixing and fastening nail. The sector gear is mounted on the output shaft of the steering gear through the sector gear fixing and fastening nail and rotates coaxially with the output shaft.

3. The steering gear position feedback device according to claim 1, characterized in that: The feedback gear assembly includes a feedback gear, a small feedback gear bearing, a feedback gear support shaft, a large feedback gear bearing and a large feedback gear bearing support plate. The small feedback gear bearing, the feedback gear and the large feedback gear bearing are sequentially mounted on the feedback gear support shaft, the large feedback gear bearing is mounted on the large feedback gear bearing support plate, and the large feedback gear bearing support plate is fixed on the servo body.

4. A steering gear position feedback device according to claim 3, characterized in that: The magnet assembly comprises a magnet and a magnet support, wherein the magnet support is fixed on the feedback gear support shaft, and the magnet is fixed on the magnet support.

5. The steering gear position feedback device according to claim 1, characterized in that: The displacement sensor circuit assembly comprises a displacement sensor circuit and a bracket. The displacement sensor circuit is fixed on the bracket and can measure the displacement state of the magnet. The bracket is fixed on the main housing of the steering gear.

6. A steering gear position feedback device according to claim 5, characterized in that: The bracket is made of titanium alloy material.

7. The steering gear position feedback device according to claim 1, characterized in that: The distance between the magnet and the displacement sensor circuit is 1-1.5 mm.

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