Light high-temperature-resistant steering engine

Abstract

A light high-temperature-resistant steering engine relates to the field of steering engines and comprises a motor, a speed reducing mechanism, a lead screw assembly, a transmission shaft, a steering engine shell, an angular displacement sensor and a heat absorption armor. The motor, the speed reducing mechanism and the lead screw assembly are connected to the steering engine shell, the transmission shaft is rotationally connected to the steering engine shell, output torque of the motor is output to the lead screw assembly after being decelerated through the speed reducing mechanism, and the lead screw assembly is connected with the transmission shaft. The angular displacement sensor is used for measuring the rotation angle of the transmission shaft; the heat absorption armor wraps the steering engine shell, a cavity filled with a phase change material is formed in the heat absorption armor, a pressure relief hole is formed in the heat absorption armor, and the cavity is communicated with the outside through the pressure relief hole. High-temperature-resistant light materials and a layer-by-layer progressive structural design of heat resistance, heat insulation and heat absorption are adopted, key structural parts of the steering engine are subjected to strong heat insulation, heat conduction and heat radiation are blocked and absorbed layer by layer, and the purposes of being small in size, light in weight (smaller than 3.2 kg, and the power level is 1.2 kW) and resistant to the high temperature of 700 DEG C are achieved.

Description

Technical Field

[0001] The invention relates to a lightweight, high-temperature-resistant steering gear, and belongs to the technical field of steering gears. Background Art

[0002] Traditional servo electric servo products in the aerospace field adopt the "motor-reducer-screw" structure, which generally requires the aircraft tail cabin to design a special "servo bracket-connecting rod-rocker arm" and other structures for torque transmission. There are disadvantages such as the auxiliary installation structure taking up a lot of space and large overall weight. In the face of the development direction of modern aircraft such as hypersonic speed and long endurance, the servo in the form of "motor-reducer-screw-drive shaft transmission" is used to directly drive the air rudder, simplifying a series of auxiliary structures such as "servo bracket-connecting rod-rocker arm", and has the advantages of light weight and small size. However, during the high-speed flight of the aircraft, the pneumatic heating of this structure will be directly transmitted to the servo through the rudder shaft, especially for the high-temperature rudder traditional system environment conditions, which puts forward higher temperature adaptability requirements for the servo products. At present, the normal working temperature range of the more mature high-temperature resistant electric servo products in China is basically maintained at 300℃~400℃, and can only achieve short-term operation. It is still unable to reach the level of endurance of 700℃ or even higher temperatures and longer working time.

[0003] The name of Chinese patent CN203051901U is high-temperature resistant angular stroke electric actuator, a driving device that provides angular motion, mainly composed of a reducer, a motor, and an electrical control box. The high-temperature servo motor shaft gear is connected to the gear on the reducer, and the output shaft is connected to the output gear on the reducer. The internal enameled wire and components of the high-temperature resistant motor are made of high-temperature resistant materials, and the high-temperature resistance reaches 250°C. The advantage is that no additional wrapping protection is required, and the high temperature resistance reaches 250°C. The disadvantage is that the upper limit of high temperature resistance is low, and it does not have a zero-position locking function when the power is not on. Summary of the invention

[0004] The technical problem solved by the present application is: to overcome the deficiencies of the prior art and provide a lightweight 700°C high temperature resistant servo, which adopts high temperature resistant lightweight materials and a progressive structural design concept of "heat resistance → heat insulation → heat absorption", and performs a strong heat insulation design on the key structural parts of the servo, thereby blocking and absorbing heat conduction and heat radiation layer by layer, achieving the purpose of small size, light weight (less than 3.2kg, power level 1.2kW), and resistance to 700°C high temperature.

[0005] The technical solutions provided by this application are as follows:

[0006] A lightweight, high-temperature-resistant steering gear comprises a motor, a reduction mechanism, a screw assembly, a transmission shaft, a steering gear housing, an angular displacement sensor and a heat-absorbing armor; the motor is connected to one side of the steering gear housing, the reduction mechanism and the screw assembly are arranged in the steering gear housing, the transmission shaft is rotatably connected to the steering gear housing, the output shaft of the motor extends into the steering gear housing, the output shaft of the motor is connected to the input end of the reduction mechanism, the output end of the reduction mechanism is connected to the screw assembly, and the screw assembly is connected to the transmission shaft; after the output shaft of the motor is reduced in speed by the reduction mechanism, the transmission shaft is driven to rotate through the screw assembly; the angular displacement sensor is embedded from the surface of the steering gear housing into the steering gear housing, and the angular displacement sensor is used to measure the rotation angle of the transmission shaft; the heat-absorbing armor is coated on the outside of the steering gear housing, a cavity is arranged inside the heat-absorbing armor, the cavity is filled with phase change material, a pressure relief hole is arranged on the heat-absorbing armor, and the pressure relief hole connects the cavity with the outside.

[0007] A front high-temperature resistant bearing and a rear high-temperature resistant bearing are arranged between the transmission shaft and the steering gear housing. The inner rings of the front high-temperature resistant bearing and the rear high-temperature resistant bearing are both sleeved on the outside of the transmission shaft, and the outer rings of the front high-temperature resistant bearing and the rear high-temperature resistant bearing are connected to the steering gear housing.

[0008] A sector gear is installed on the outer wall surface of the transmission shaft, and the sector gear is meshed with the gear of the angular displacement sensor.

[0009] The sector gear is provided with three legs on one side facing the transmission shaft surface to form a tripod structure 16.1. A mounting portion is provided on one side of the sector gear, and a mounting bolt passes through the mounting portion and is threadedly connected to the transmission shaft.

[0010] It also includes a motor heat insulation component, which is arranged between the motor and the steering gear housing; the motor heat insulation component is a polyimide composite insulation structural component with a temperature resistance of not less than 500°C.

[0011] It also includes an angular displacement heat insulation component, which is a cylindrical structure with openings at both ends. The angular displacement sensor is located in the cylindrical structure. One end of the outer wall of the cylindrical structure is connected to the mounting lug. The fixing bolt passes through the fixing lug and the mounting lug of the angular displacement sensor and is threadedly connected to the steering gear housing. The angular displacement heat insulation component is a polyimide composite insulation structural component with a temperature resistance of not less than 500°C.

[0012] The outer wall surface of the transmission shaft is provided with a heat reducing groove structure to reduce the contact area between the transmission shaft and the front high temperature resistant bearing.

[0013] The heat reduction groove structure is filled with high temperature resistant grease.

[0014] The end of the transmission shaft is provided with a mounting groove for mounting the rudder shaft; the transmission shaft is provided with a second heat reduction groove structure on the inner wall surface of the mounting groove to reduce the contact area between the rudder shaft and the transmission shaft.

[0015] The second heat reduction tank structure is filled with paraffin to absorb heat through the high-temperature liquefaction process of the paraffin.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects:

[0017] 1) The transmission shaft and steering gear housing of the present invention are respectively made of lightweight materials such as titanium alloy and magnesium rare earth alloy, with a weight of less than 3.2kg and a power of 1.2kW;

[0018] 2) The present invention improves the high temperature resistance of the steering gear from 300°C to 400°C to 700°C;

[0019] 3) In order to solve the problem of performance degradation of lightweight alloys and major components under high temperature conditions, the present invention adopts a progressive design method of "heat resistance → heat insulation → heat absorption", thereby achieving reliable operation of the servo for 800 seconds under continuous high temperature input conditions of 700°C.

[0020] 4) The present invention uses a large number of "heat-insulating" structural parts to cover, which reduces the working environment temperature of major components and improves reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The figure is the overall schematic diagram of the steering gear structure;

[0022] Figure 2 This is a schematic diagram of the exploded structure of the steering gear;

[0023] Figure 3 It is the main "heat insulation" structural component inside the steering gear;

[0024] Figure 4 It is the main "heat absorbing" structural part outside the steering gear;

[0025] Figure 5 It is a steering gear transmission shaft structural component;

[0026] Figure 6 It is a "three-legged" angular displacement sector gear. DETAILED DESCRIPTION

[0027] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments disclosed in the present invention will be further described in detail below with reference to the accompanying drawings.

[0028] The present application embodiment discloses a lightweight, high temperature resistant steering gear, such as Figure 1 and Figure 2 As shown, it includes a motor 1, a reduction mechanism 2, a screw assembly 3, a transmission shaft 4, a front high-temperature resistant bearing 5, a rear high-temperature resistant bearing 6, a steering gear housing 7, an angular displacement sensor 8, and a heat-absorbing armor 9.

[0029] The front high temperature resistant bearing 5 and the rear high temperature resistant bearing 6 are respectively arranged at the front and rear ends of the transmission shaft 4, and are supported inside the steering gear housing 7; the motor 1 drives the screw assembly 3 to perform "extension-contraction" movement through the reduction mechanism 2, and the screw assembly 3 applies an axial rotational torque to the rudder shaft 10 through the transmission shaft 4 to realize the control of the rotation angle of the air rudder; the fan gear 16 is installed on the transmission shaft 4, and is used to transmit the rotation angle of the transmission shaft 4 to the angular displacement sensor 8 to realize closed-loop control; the heat absorbing armor 9 is mainly composed of three parts: heat absorbing armor A9.1, heat absorbing armor B 9.2, and heat absorbing armor C 9.3, which are respectively arranged at three positions on the surface of the steering gear housing 7 to cool it in three dimensions.

[0030] like Figure 1 , Figure 2 and Figure 3 As shown, the internal "insulation" of the steering gear adopts a polyimide composite insulation structure, which mainly includes: a motor insulation 11 and an angular displacement insulation 12. The above insulation materials are resistant to 500°C. The motor insulation is installed between the steering gear housing 7 and the motor 1; the angular displacement insulation 12 is installed on the outer surface of the angular displacement 17. Specifically, the angular displacement insulation 12 is a cylindrical structure with openings at both ends. The angular displacement sensor 8 is located in the cylindrical structure. One end of the outer wall of the cylindrical structure is connected to the mounting lug. The fixing bolt passes through the fixing lug and the mounting lug of the angular displacement sensor 8 and is threadedly connected to the steering gear housing 7.

[0031] like Figure 4 As shown, the interiors of the heat-absorbing armor A9.1, the heat-absorbing armor B 9.2 and the heat-absorbing armor C 9.3 are all provided with cavities, which are filled with phase change materials. The external "heat absorption" of the servo adopts three heat-absorbing armors, namely, the heat-absorbing armor A9.1, the heat-absorbing armor B 9.2 and the heat-absorbing armor C 9.3, for sacrificial heat dissipation. The heat-absorbing armors are respectively provided with pressure relief hole structure A9.1.1, pressure relief hole structure B 9.2.1 and pressure relief hole structure C9.3.1. The pressure relief hole structure A9.1.1, the pressure relief hole structure B 9.2.1 and the pressure relief hole structure C9.3.1 are all used to connect the cavity with the outside to release the vaporized steam of the phase change material and take away the heat.

[0032] like Figure 5As shown, the sector gear 16 is installed on the transmission shaft 4, and is used to transmit the angular position of the transmission shaft 4 to the angular displacement sensor 8; the transmission shaft 4 is provided with a heat reduction groove structure 4.1, which reduces the contact area between the transmission shaft 4 and the front high-temperature resistant bearing 5 and reduces its thermal conductivity, and is filled with high-temperature resistant grease. On the one hand, the grease absorbs part of the heat when it heats up, and on the other hand, the grease softens to provide continuous auxiliary lubrication for the front high-temperature resistant bearing 5; an installation groove is provided at the end of the transmission shaft 4, and the installation groove is used to install the rudder shaft 10; the transmission shaft 4 is provided with a second heat reduction groove structure 4.2 on the inner wall surface of the installation groove, and the second heat reduction groove structure 4.2 is used to reduce the contact area between the rudder shaft 10 and the transmission shaft 4 and reduce its thermal conductivity, and the groove is filled with high-melting point paraffin to absorb heat through its high-temperature liquefaction process.

[0033] like Figure 6 As shown, the sector gear 16 is mounted on the transmission shaft 4 by two screws. The sector gear 16 adopts a "three-legged structure 16.1" design, specifically: three legs are set on the side of the sector gear 16 facing the surface of the transmission shaft 4 to form a three-legged structure 16.1. The sector gear 16 has only three legs in contact with the surface of the transmission shaft 4. The main purpose is to reduce the contact area with the transmission shaft 4, reduce the heat conduction efficiency, and ensure a low temperature working environment for angular displacement. The surface of the transmission shaft 4 is provided with a sector gear mounting groove, and a mounting portion is provided on one side of the sector gear 16. The mounting bolt passes through the mounting portion and is threadedly connected to the transmission shaft 4 to install the sector gear 16 in the sector gear mounting groove.

[0034] Advantages of the present invention:

[0035] 1) Polyimide high temperature resistant insulation devices are installed on the motor mounting surface and the angular displacement sensor mounting flange surface, and a strong insulation design is implemented to significantly improve the high temperature resistance of the main components of the steering gear.

[0036] 2) Designing a slotted structure transmission shaft reduces the heat conduction efficiency of the transmission shaft to other components while meeting the strength requirements, thereby improving the high temperature resistance of the servo.

[0037] 3) The three-legged sector gear is designed to reduce the contact area between it and the transmission shaft, further improving the high temperature resistance of the angular displacement sensor.

[0038] 4) A three-sided external heat-absorbing armor structure is used, and phase change materials are filled inside. It absorbs heat in a sacrificial manner and vaporizes it to reduce material loss, continuously cooling the steering gear. The heat-absorbing armor can work for more than 800 seconds.

[0039] The contents not described in detail in this application specification belong to the common knowledge of those skilled in the art.

[0040] The present application is described in detail above in conjunction with specific implementation methods and exemplary examples, but these descriptions cannot be understood as limiting the present application. Those skilled in the art understand that, without departing from the spirit and scope of the present application, a variety of equivalent replacements, modifications or improvements can be made to the technical solution of the present application and its implementation methods, all of which fall within the scope of the present application. The scope of protection of the present application shall be subject to the attached claims.

Claims

1. A lightweight, high temperature resistant steering gear, characterized in that: It comprises a motor (1), a speed reduction mechanism (2), a lead screw assembly (3), a transmission shaft (4), a steering gear housing (7), an angular displacement sensor (8) and a heat absorbing armor (9); The motor (1) is connected to one side of a steering gear housing (7), the speed reduction mechanism (2) and the lead screw assembly (3) are arranged in the steering gear housing (7), the transmission shaft (4) is rotatably connected to the steering gear housing (7), the output shaft of the motor (1) extends into the steering gear housing (7), the output shaft of the motor (1) is connected to the input end of the speed reduction mechanism (2), the output end of the speed reduction mechanism (2) is connected to the lead screw assembly (3), and the lead screw assembly (3) is connected to the transmission shaft (4); after the output shaft of the motor (1) is decelerated by the speed reduction mechanism (2), the transmission shaft (4) is driven to rotate through the lead screw assembly (3); the angular displacement sensor (8) is embedded in the steering gear housing (7) from the surface of the steering gear housing (7), and the angular displacement sensor (8) is used to measure the rotation angle of the transmission shaft (4); The heat absorbing armor (9) is coated on the outside of the steering gear housing (7), a cavity is arranged inside the heat absorbing armor (9), the cavity is filled with phase change material, and a pressure relief hole is arranged on the heat absorbing armor (9), which connects the cavity with the outside.

2. A lightweight, high temperature resistant steering gear according to claim 1, characterized in that: A front high temperature resistant bearing (5) and a rear high temperature resistant bearing (6) are arranged between the transmission shaft (4) and the steering gear housing (7); the inner rings of the front high temperature resistant bearing (5) and the rear high temperature resistant bearing (6) are sleeved on the outside of the transmission shaft (4); and the outer rings of the front high temperature resistant bearing (5) and the rear high temperature resistant bearing (6) are connected to the inside of the steering gear housing (7).

3. The lightweight, high temperature resistant steering gear according to claim 1, characterized in that: A sector gear (16) is mounted on the outer wall surface of the transmission shaft (4), and the sector gear (16) is meshed with a gear of the angular displacement sensor (8).

4. A lightweight, high temperature resistant steering gear according to claim 3, characterized in that: The sector gear (16) is provided with three legs on one side facing the surface of the transmission shaft (4) to form a three-legged structure 16.

1. A mounting portion is provided on one side of the sector gear (16), and a mounting bolt passes through the mounting portion and is threadedly connected to the transmission shaft (4).

5. The lightweight, high temperature resistant steering gear according to claim 1, characterized in that: It also comprises a motor heat insulation component (11), which is arranged between the motor (1) and the steering gear housing (7); the motor heat insulation component (11) is a polyimide composite heat insulation structural component with a temperature resistance of not less than 500°C.

6. The lightweight, high temperature resistant steering gear according to claim 1, characterized in that: It also includes an angular displacement heat insulation member (12), which is a cylindrical structure with two ends open. The angular displacement sensor (8) is located in the cylindrical structure. One end of the outer wall of the cylindrical structure is connected to a mounting lug. The fixing bolt passes through the fixing lug and the mounting lug of the angular displacement sensor (8) and is threadedly connected to the steering gear housing (7). The angular displacement heat insulation member (12) is a polyimide composite heat insulation structural member with a temperature resistance of not less than 500°C.

7. The lightweight, high temperature resistant steering gear according to claim 1, characterized in that: The outer wall surface of the transmission shaft (4) is provided with a heat reduction groove structure (4.1) to reduce the contact area between the transmission shaft and the front high temperature resistant bearing (5).

8. The lightweight, high temperature resistant steering gear according to claim 7, characterized in that: The heat reduction groove structure (4.1) is filled with high temperature resistant lubricating grease.

9. The lightweight, high temperature resistant steering gear according to claim 1, characterized in that: The end of the transmission shaft (4) is provided with a mounting groove, which is used to mount the rudder shaft (10); the transmission shaft (4) is provided with a second heat reduction groove structure (4.2) on the inner wall surface of the mounting groove to reduce the contact area between the rudder shaft (10) and the transmission shaft (4).

10. A lightweight, high temperature resistant steering gear according to claim 9, characterized in that: The second heat reduction tank structure (4.2) is filled with paraffin to absorb heat through the high-temperature liquefaction process of the paraffin.

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