Output shaft sleeve limiting mechanism applied to servo mechanism

Abstract

The utility model relates to an output shaft sleeve limiting mechanism applied to a servo mechanism, which comprises a rudderpost with a limiting bulge formed on the outer surface; a limiting groove is formed in the inner wall of the output shaft sleeve; a positioning surface is formed on the outer surface of the positioning pin, and the positioning pin penetrates through the through hole; the limiting groove is used for limiting the limiting protrusion, the positioning face is used for positioning the limiting protrusion, and the through hole is matched with the positioning pin and communicates with the limiting groove. According to the utility model, the traditional way of positioning the limiting bulge on the rudder shaft by using the mounting positioning surface is changed into the way of positioning the limiting bulge on the rudder shaft by using the positioning surface on the positioning pin, and the built-in mounting positioning surface which is not easy to process is changed into the external positioning surface which is convenient to process on the positioning pin; the production efficiency is improved, the part qualification rate and the machining precision of the output shaft sleeve and the positioning pin are improved, the machining precision of the positioning surface can reach 0.005-0.01 mm, the machining error is reduced, and the positioning precision of the rudder shaft is also improved.

Description

Technical Field

[0001] The utility model relates to the field of output shaft limiting of a servo mechanism, in particular to an output shaft sleeve limiting mechanism applied to the servo mechanism. Background Art

[0002] With the rapid development of missile models, in order to give full play to the flight capability of missiles, efforts should be made to reduce the structural mass of the electric servo mechanism that controls the missile's flight attitude as much as possible. Therefore, the electric servo mechanism is required to be integrated as a whole. At the same time, missiles are disposable products. Once the electric servo mechanism fails after launch, it cannot be eliminated by itself. Therefore, the electric servo mechanism is required to have higher reliability.

[0003] As the overall requirements for electric servo mechanisms, especially reliability and low cost, become increasingly higher, there is an urgent need for electric servo mechanism technology to develop in the direction of high efficiency, high power ratio and high reliability.

[0004] The output sleeve currently designed and produced in China has a complex structure, long processing cycle, low parts qualification rate, high cost, and poor parts precision consistency, which affects the overall servo mechanism performance and reduces product reliability. The structural design of the output sleeve can no longer meet all requirements, limiting its promotion and application.

[0005] At present, the output shaft sleeves at home and abroad are all one-piece, which is difficult to process in the mechanical limit position, has a large volume, and is extremely difficult to ensure the processing accuracy, resulting in a low part qualification rate and high cost. Figure 1 In order to realize the installation limit of the output rudder shaft, an installation positioning surface 100 is designed and processed on the output sleeve to achieve the purpose of precise positioning. However, the width of the installation positioning surface 100 is only 4 mm, which cannot be processed using traditional processing methods. Therefore, it can only be processed by electric spark processing using special electrodes. However, the material of the output sleeve is generally titanium alloy, and its electric spark performance is poor. The processing of an output sleeve takes 5 to 6 hours, and the accuracy of the installation positioning surface processed by this processing method can only reach 0.03 mm, resulting in a low qualified rate of parts of the output sleeve. Summary of the invention

[0006] In order to improve the parts qualification rate of the output shaft sleeve, and at the same time improve the processing accuracy of the output shaft sleeve and the positioning accuracy of the rudder shaft in the output shaft sleeve, the utility model provides an output shaft sleeve limiting mechanism applied to a servo mechanism, which changes the traditional positioning of the limiting protrusion on the rudder shaft by using the installation positioning surface to positioning the limiting protrusion on the rudder shaft by using the positioning surface on the positioning pin, thereby changing the built-in installation positioning surface that is not easy to be processed into an external positioning surface on the positioning pin that is easy to be processed. It not only improves the production efficiency, but also greatly improves the parts qualification rate of the output shaft sleeve and the positioning pin, and also improves the processing accuracy. It is not only easy to be processed, but also the processing accuracy of the positioning surface can reach 0.005-0.01mm. Compared with the processing accuracy of 0.03mm of the installation positioning surface 100, it greatly improves the processing accuracy of the parts, reduces the processing error, and also improves the positioning accuracy of the rudder shaft in the output shaft sleeve.

[0007] The utility model provides an output shaft sleeve limiting mechanism applied to a servo mechanism, which adopts the following technical solution:

[0008] An output shaft sleeve limiting mechanism applied to a servo mechanism, comprising:

[0009] The rudder shaft has a limited position protrusion formed on its outer surface;

[0010] The output shaft sleeve has a limit groove on its inner wall; and

[0011] The positioning pin has a positioning surface formed on its outer surface and is inserted into a through hole provided on the output shaft sleeve to limit the position of the rudder shaft;

[0012] The limiting groove is used to cooperate with the limiting protrusion and limit the limiting protrusion, the positioning surface is used to cooperate with the limiting protrusion and position the limiting protrusion, and the through hole cooperates with the positioning pin and is connected with the limiting groove.

[0013] Preferably, the limiting groove is a through groove.

[0014] Preferably, the number of the limiting protrusions and the number of the positioning pins are both two, and the two positioning pins are used to position the two limiting protrusions respectively.

[0015] Preferably, the two positioning pins are evenly distributed along the circumferential direction of the output shaft sleeve.

[0016] Preferably, the number of the positioning surfaces on the positioning pin is two, and the two positioning surfaces are symmetrically distributed on both sides of the axis of the positioning pin.

[0017] In summary, the utility model includes the following beneficial technical effects:

[0018] 1. The utility model changes the traditional method of positioning the limiting protrusion on the rudder shaft by using the positioning surface on the positioning pin to positioning the limiting protrusion on the rudder shaft, thereby changing the built-in installation positioning surface that is not easy to be processed into an external positioning surface on the positioning pin that is easy to be processed. It not only improves the production efficiency, but also greatly improves the parts qualification rate of the output shaft sleeve and the positioning pin, and also improves the processing accuracy. It is not only easy to be processed, but also the processing accuracy of the positioning surface can reach 0.005-0.01mm. Compared with the processing accuracy of 0.03mm of the installation positioning surface 100, it greatly improves the processing accuracy of the parts, reduces the processing error, and also improves the positioning accuracy of the rudder shaft in the output shaft sleeve.

[0019] 2. The utility model utilizes a combined mechanical structure to split the traditional output shaft sleeve that needs to be processed with an installation positioning surface into two parts with simpler structures, which not only reduces the production difficulty, but also facilitates installation. Although the number of parts is increased after the traditional output shaft sleeve with an installation positioning surface is split and designed, the difficulty and process of assembling the parts are not increased, and the processing difficulty of the output shaft sleeve is greatly reduced. At the same time, the work efficiency is improved and the product cost is reduced.

[0020] 3. The utility model changes the traditional output shaft sleeve with the installation positioning surface into an improved output shaft sleeve and positioning pin. The improved output shaft sleeve can be processed by the slow wire cutting method. The processing time of each part only takes more than ten minutes, which effectively improves the factory production efficiency. The slow wire cutting processing accuracy can reach 0.005-0.01mm, which greatly improves the part qualification rate and effectively reduces the processing cost.

[0021] 4. The output sleeve in the utility model has a simple structure, and the rudder shaft is accurately positioned by the positioning pin. When it is used to form a system, the parts processing is simple, the parts qualification rate is high, and the parts precision consistency is high, which has a positive significance for controlling product reliability and reducing costs. The design and use of the limit mechanism make it have important significance for the integration of the structure and function of the servo mechanism and reducing costs.

[0022] 5. The utility model adopts an integrated design mode to reduce the difficulty of output shaft sleeve processing and improve the precision of parts, which is of great significance to improving the reliability of electric servo mechanism. The utility model has a simple working principle, compact structure, few parts, low manufacturing cost, good economy, can be conveniently applied to servo mechanism design, and promotes the integrated design of servo mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the background technology of the utility model.

[0024] Figure 2It is a schematic diagram of the full cross-section structure of the output shaft sleeve limiting mechanism in the embodiment of the utility model.

[0025] Figure 3 It is an exploded view of the output shaft sleeve limiting mechanism in the embodiment of the utility model.

[0026] Explanation of the reference numerals: 100, installation positioning surface; 1, rudder shaft; 11, limiting protrusion; 2, output shaft sleeve; 21, limiting groove; 22, through hole; 3, positioning pin; 31, positioning surface. DETAILED DESCRIPTION

[0027] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0028] The embodiment of the utility model discloses an output shaft sleeve limiting mechanism applied to a servo mechanism.

[0029] Reference Figure 2 and Figure 3 The output shaft sleeve 2 limiting mechanism includes a rudder shaft 1, an output shaft sleeve 2 and a positioning pin 3.

[0030] A limiting protrusion 11 is formed on the outer surface of the rudder shaft 1. Specifically, the limiting protrusion 11 is a strip-shaped protrusion, and the limiting protrusion 11 is arranged along the axial direction of the rudder shaft 1. In this embodiment, the number of the limiting protrusions 11 is two, and the two limiting protrusions 11 are evenly distributed along the circumferential direction of the rudder shaft 1, that is, the two limiting protrusions 11 are symmetrically distributed on both sides of the axis of the rudder shaft 1.

[0031] Reference Figure 2 and Figure 3 The inner wall of the output sleeve 2 is provided with a limiting groove 21, which is used to cooperate with the limiting protrusion 11, and the limiting groove 21 is used to limit the limiting protrusion 11 to prevent the rudder shaft 1 from rotating relative to the output sleeve 2 in the output sleeve 2. The limiting groove 21 is also arranged in a strip shape, and the limiting groove 21 is arranged along the axial direction of the output sleeve 2. The number of the limiting grooves 21 is the same as the number of the limiting protrusions 11, and the limiting grooves 21 are used to accommodate the limiting protrusions 11 on the rudder shaft 1. In order to facilitate workers to process the limiting grooves 21 on the output sleeve 2, the limiting grooves 21 are arranged as through grooves.

[0032] Reference Figure 2 and Figure 3The positioning pin 3 is penetrated on the output sleeve 2 along the radial direction of the output sleeve 2. The output sleeve 2 is provided with a through hole 22 for penetrating the positioning pin 3. The through hole 22 is used in conjunction with the positioning pin 3, and the through hole 22 is connected to the limiting groove 21. During assembly, the positioning pin 3 and the output sleeve 2 adopt a micro-interference fit. The positioning pin 3 can not only effectively achieve the positioning purpose, but also will not be loose at all. There are two positioning pins 3, and the two positioning pins 3 are evenly distributed along the circumferential direction of the output sleeve 2, that is, the two positioning pins 3 are symmetrically distributed on both sides of the axis of the output sleeve 2, and the two positioning pins 3 are respectively used to position the two limiting protrusions 11.

[0033] A positioning surface 31 for limiting the limiting protrusion 11 is formed on the positioning pin 3 . The positioning surface 31 cooperates with the limiting protrusion 11 for use. When in use, the bottom of the limiting protrusion 11 abuts against the positioning surface 31 .

[0034] Reference Figure 2 and Figure 3 In order to facilitate the staff to assemble the locating pin 3 and the output shaft sleeve 2, the number of locating surfaces 31 on each locating pin 3 is set to two, and the two locating surfaces 31 are symmetrically distributed on both sides of the axis of the locating pin 3. When in use, the two locating surfaces 31 can both position the limiting protrusion 11 on the rudder shaft 1.

[0035] In other embodiments, the number of the limiting protrusions 11 , the limiting grooves 21 and the positioning pins 3 may be determined according to actual conditions and is not limited to two, but may also be one or more than two.

[0036] The utility model changes the traditional method of positioning the limiting protrusion 11 on the rudder shaft 1 by using the positioning surface 31 on the positioning pin 3 to position the limiting protrusion 11 on the rudder shaft 1, thereby changing the built-in installation positioning surface 100 that is not easy to be processed into an external positioning surface 31 on the positioning pin 3 that is easy to be processed, which not only improves the production efficiency, but also greatly improves the qualified rate of parts and improves the processing accuracy. The positioning surface 31 is not only easy to be processed relative to the installation positioning surface 100, but also the processing accuracy of the positioning surface can reach 0.005-0.01mm, which is relative to the processing accuracy of 0.03mm of the installation positioning surface 100, which greatly improves the processing accuracy of parts, reduces processing errors, and also improves the positioning accuracy of the rudder shaft 1 in the output shaft sleeve 2.

[0037] The above are all preferred embodiments of the present utility model, and are not intended to limit the protection scope of the present utility model. Therefore, any equivalent changes made based on the structure, shape, and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. An output sleeve limiting mechanism applied to a servo mechanism, characterized in that: include: The rudder shaft has a limited position protrusion formed on its outer surface; The output shaft sleeve has a limit groove on its inner wall; and The positioning pin has a positioning surface formed on its outer surface and is inserted into a through hole provided on the output shaft sleeve to limit the position of the rudder shaft; The limiting groove is used to cooperate with the limiting protrusion and limit the limiting protrusion, the positioning surface is used to cooperate with the limiting protrusion and position the limiting protrusion, and the through hole cooperates with the positioning pin and is connected with the limiting groove.

2. The output sleeve limiting mechanism for a servo mechanism according to claim 1, characterized in that: The limiting groove is a through groove.

3. The output sleeve limiting mechanism applied to a servo mechanism according to claim 1, characterized in that: The number of the limiting protrusions and the number of the positioning pins are both two, and the two positioning pins are used to position the two limiting protrusions respectively.

4. The output sleeve limiting mechanism applied to a servo mechanism according to claim 3, characterized in that: The two positioning pins are evenly distributed along the circumferential direction of the output shaft sleeve.

5. The output sleeve limiting mechanism for a servo mechanism according to any one of claims 1 to 4, characterized in that: There are two locating surfaces on the locating pin, and the two locating surfaces are symmetrically distributed on both sides of the locating pin axis.

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