High-temperature-resistant corner output servo actuator

Abstract

A high-temperature-resistant corner output servo actuator relates to the field of aerospace equipment and comprises a shell, a motor, a displacement sensor, a pinion, a sector gear, a shifting fork shaft, a motor heat insulation sleeve, a shell heat insulation pad, a displacement sensor heat insulation sleeve and a sector gear heat insulation pad, the motor is fixedly connected to the outer wall of the shell, and an output shaft of the motor is used for driving the shifting fork shaft to rotate; the shifting fork shaft is rotationally connected to the shell, one end face of the shifting fork shaft is fixedly connected with the sector gear, the displacement sensor is fixedly connected to the shell, a rotating shaft of the displacement sensor is fixedly connected with the small gear, and the small gear is meshed with the sector gear. A shell heat insulation pad is arranged between the shell and the mounting bulkhead, and the two side faces of the shell heat insulation pad are directly attached to the shell and the mounting bulkhead respectively; a motor heat insulation sleeve is arranged between the motor and the shell, a displacement sensor heat insulation sleeve is arranged between the displacement sensor and the servo mechanism shell, and a fan-shaped tooth heat insulation pad is arranged between the fan-shaped tooth and the shifting fork shaft. The size is small, the tolerable temperature is high, and normal and reliable work with the highest temperature reaching 500 DEG C within 400 s is achieved.

Description

Technical Field

[0001] The invention relates to a servo actuator, in particular to a high temperature resistant angle output servo actuator, belonging to the field of aerospace equipment. Background Art

[0002] At present, hypersonic weapons have an increasingly higher demand for high-temperature resistance of servo actuators. In the case of extremely limited space, the thermal protection layer of the air rudder is set relatively thin, and the rudder shaft temperature has jumped to 500°C, and some even need to reach 700°C. The temperature of the aircraft cabin wall reaches 300°C and the air rudder is directly contacted and connected with the servo actuator, which directly transfers the high temperature to the servo actuator.

[0003] Currently, there are two main technical approaches to solve the problem of high temperature environment: one is to wrap the servo actuator with a heat-proof sleeve, which is mainly used for linear output servo actuators in heat flow environments to isolate the product from the heat flow environment. The heat-proof sleeve wrapping process is complicated, heavy, and costly, and is not suitable for angle output servo actuators whose heat source is direct contact heat conduction; the second is to enable the servo actuator itself to withstand high temperature environments by selecting high-temperature motors and high-temperature displacement sensors and high-temperature resistant raw materials and components. This is very expensive and can only meet the requirements of high-temperature environments of 300℃ to 350℃. 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 high-temperature resistant angle output servo actuator to achieve the goals of small size, high temperature tolerance, light weight and low cost.

[0005] The innovation of the present invention lies in that, through a distributed heat insulation method, high-temperature resistant metal materials are used for the load-bearing structural parts close to the heat source, and the composite materials with low thermal conductivity and high temperature resistance are made into the form of insulation pads or insulation sleeves, thereby reducing the impact of transferred heat on heat-sensitive products such as motors and displacement sensors, thereby achieving normal and reliable operation with a maximum temperature of 500°C within 400s.

[0006] The technical solutions provided by this application are as follows:

[0007] A high temperature resistant angular output servo actuator, comprising a housing, a motor, a motor heat insulation sleeve, a displacement sensor, a pinion, a sector tooth, a fork shaft, a housing heat insulation pad, a sector tooth heat insulation pad and a displacement sensor heat insulation sleeve;

[0008] The motor is fixedly connected to the outer wall of the housing, and the output shaft of the motor drives the fork shaft to rotate through the reducer and the screw pair; the fork shaft is rotatably connected to the housing through the bearing, one end face of the fork shaft is fixedly connected to the sector tooth, the displacement sensor is fixedly connected to the housing, the displacement sensor shaft is fixedly connected to the pinion, and the pinion meshes with the sector tooth;

[0009] A shell thermal insulation pad is arranged between the shell and the installation bulkhead, and the two sides of the shell thermal insulation pad are directly in contact with the shell and the installation bulkhead respectively; a motor thermal insulation sleeve is arranged between the motor and the shell, a displacement sensor thermal insulation sleeve is arranged between the displacement sensor and the servo mechanism shell, and a sector tooth thermal insulation pad is arranged between the sector tooth and the fork shaft.

[0010] Needle roller bearings and cylindrical roller bearings are installed at both ends of the fork shaft respectively, and the needle roller bearings and cylindrical roller bearings are fixedly installed in the servo mechanism housing to support the fork shaft. The needle roller bearings and cylindrical roller bearings are both made of high-temperature resistant high-nitrogen steel materials, and the fork shaft is made of high-temperature alloy materials.

[0011] The needle roller bearing is a needle roller bearing without an inner ring; the outer surface of the shift fork shaft is coated with CrN with a thickness of 3 μm and a surface hardness of 58 to 60 HRC.

[0012] The motor heat insulation sleeve is a semi-enclosed structure, the surface of the motor in contact with the housing is covered by the motor heat insulation sleeve, and the surface of the motor facing away from the housing is not covered by the motor heat insulation sleeve.

[0013] The surface of the shell is provided with an arc-shaped mounting groove, one end of the arc-shaped mounting groove extends to the edge of the shell, and the other end of the arc-shaped mounting groove is a mounting end face. The motor insulation sleeve includes a side plate and an end plate. The side plate is a semi-cylindrical shape with openings at both ends. The side plate cooperates with the wall surface of the arc-shaped mounting groove. The end plate is connected to one end of the side plate, and the end plate contacts the mounting end face. The motor is connected with a stopper portion, and the output shaft of the motor is located on the inner side of the stopper portion. The motor is provided with bolt holes, and the end plate is provided with through holes corresponding to the bolt holes and through holes corresponding to the stopper portion. The motor is located on the inner side of the side plate, and the stopper portion of the motor passes through the through hole and cooperates with the mounting end face. The bolt passes through the shell and the through hole and is threadedly connected to the bolt hole position of the motor.

[0014] The displacement sensor thermal insulation sleeve includes a thermal insulation tube with one end closed, the outer wall of the open end of the thermal insulation tube is connected to a mounting ear, the displacement sensor is installed in the thermal insulation tube, the displacement sensor is connected to mounting ears corresponding to the mounting ears one by one, the shell is provided with a mounting hole, the closed end of the thermal insulation tube extends into the shell through the mounting hole, the mounting ear is located outside the shell, and the bolt passes through the mounting ear, the mounting ear and is connected to the shell.

[0015] A groove is provided at a position of the sector-shaped tooth facing the fork shaft, the sector-shaped tooth heat insulation pad is located in the groove, and the fixing bolt passes through the sector-shaped tooth and the sector-shaped tooth heat insulation pad and is connected to the fork shaft.

[0016] The motor heat insulation sleeve, the housing heat insulation pad, the sector gear heat insulation pad and the displacement sensor heat insulation sleeve are all made of polyimide materials.

[0017] The housing is made of titanium alloy; the pinion and sector teeth are made of aluminum alloy or high-temperature resistant non-metallic material.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects:

[0019] (1) The present invention provides a distributed heat insulation solution that adapts to heat conduction through a high-temperature environment source, without the need for a heat-resistant protective gear on the outside of the product, and has the advantages of small size, light weight, and easy installation.

[0020] (2) The present invention uses ordinary conventional motors and displacement sensors, which have the characteristics of low cost and light weight compared to high temperature resistant motors and displacement sensors.

[0021] (3) The present invention provides a high temperature resistance solution for the angle output servo actuator, which has passed the test with the highest temperature reaching 500°C within 400 seconds. Compared with the existing solution of 300°C to 350°C, the high temperature resistance capability is significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the mechanism in an embodiment of the present invention;

[0023] Figure 2 It is a schematic diagram of the arrangement of the fork shaft and the displacement sensor in an embodiment of the present invention;

[0024] Figure 3 Schematic diagram of a heat insulation sleeve for a motor in an embodiment of the present invention;

[0025] Figure 4 Schematic diagram of a heat insulation sleeve of a displacement sensor in an embodiment of the present invention;

[0026] Figure 5 Schematic diagram of a shell thermal insulation pad in an embodiment of the present invention;

[0027] Figure 6 Schematic diagram of the fan-shaped tooth thermal insulation pad in an embodiment of the present invention.

[0028] Explanation of the accompanying figures: 1. Housing; 2. Motor; 3. Motor insulation sleeve; 4. Displacement sensor; 5. Pinion; 6. Sector teeth; 7. Fork shaft; 8. Housing insulation pad; 9. Sector teeth insulation pad; 10. Displacement sensor insulation sleeve; 11. Needle roller bearing; 12. Cylindrical roller bearing. DETAILED DESCRIPTION

[0029] 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.

[0030] like Figure 1 , 2As shown, an embodiment of the present application discloses a high temperature resistant angular output servo actuator, including a housing 1, a motor 2, a motor thermal insulation sleeve 3, a displacement sensor 4, a pinion 5, a sector tooth 6, a fork shaft 7, a housing thermal insulation pad 8, a sector tooth thermal insulation pad 9, a displacement sensor thermal insulation sleeve 10, a needle roller bearing 11 and a cylindrical roller bearing 12.

[0031] A shell thermal insulation pad 8 is arranged between the shell 1 and the installation bulkhead, and the two side surfaces of the shell thermal insulation pad 8 are directly in contact with the shell 1 and the installation bulkhead respectively; a motor thermal insulation sleeve 3 is arranged between the motor 2 and the shell 1, and the motor 2 is separated from the servo mechanism shell 1 by the motor thermal insulation sleeve 3 to avoid direct contact heat transfer; a displacement sensor thermal insulation sleeve 10 is arranged between the displacement sensor 4 and the servo mechanism shell 1, and the displacement sensor 4 is separated from the servo mechanism shell 1 by the displacement sensor thermal insulation sleeve 10 to avoid direct contact heat transfer. The rotating shaft of the displacement sensor 4 is fixedly connected to the pinion 5; needle bearings 11 and cylindrical roller bearings 12 are respectively installed at both ends of the fork shaft 7, and the needle bearings 11 and cylindrical roller bearings 12 are fixedly installed in the servo mechanism housing 1 to support the fork shaft 7; the end of the fork shaft 7 is fixedly connected with a sector tooth 6, and a sector tooth thermal insulation pad 9 is arranged between the sector tooth 6 and the fork shaft 7, and the sector tooth thermal insulation pad 9 is used to separate the sector tooth 6 from the fork shaft 7 to avoid direct contact heat transfer; the pinion 5 is meshed with the sector tooth 6 to transmit the movement of the fork shaft 7 to the displacement sensor 4; specifically, a groove is opened at the position of the sector tooth 6 opposite to the fork shaft 7, the sector tooth thermal insulation pad 9 is located in the groove, and the fixing bolt passes through the sector tooth 6 and the sector tooth thermal insulation pad 9 and is connected to the fork shaft 7.

[0032] like Figure 2 As shown, the needle roller bearing 11 and the cylindrical roller bearing 12 of the present invention are both made of high-temperature resistant high-nitrogen steel material, and the fork shaft 7 is made of high-temperature alloy material, wherein the needle roller bearing 11 is a needle roller bearing without an inner ring. In order to improve the surface hardness of the fork shaft 7 at high temperatures, the outer surface of the fork shaft 7 is subjected to high-temperature sputtering CrN with a thickness of 3um and a surface hardness of 58 to 60HRC, thereby achieving high-temperature resistant transmission in a small volume space.

[0033] like Figure 2 As shown, it is a schematic diagram of the arrangement of the fork shaft 7 and the displacement sensor 4 of the present invention. The displacement sensor 4 is placed parallel to the fork shaft 7, and the motion is transmitted through the pinion 5 and the sector gear 6, thereby avoiding direct contact and heat transfer with the fork shaft.

[0034] like Figure 3As shown, the motor heat insulation sleeve 3 of the present invention is a semi-enclosed structure, the enclosed part can slow down the heat transferred from the isolation shell 1, and the open part can dissipate the heat generated by the motor itself. Specifically, the surface of the shell 1 is provided with an arc-shaped mounting groove, one end of the arc-shaped mounting groove extends to the edge of the shell 1, and the other end of the arc-shaped mounting groove is the mounting end face. The motor heat insulation sleeve 3 includes a side plate and an end plate, the side plate is a semi-cylindrical shape with openings at both ends, the side plate cooperates with the wall surface of the arc-shaped mounting groove, the end plate is connected to one end of the side plate, and the end plate contacts the mounting end face. The motor 2 is connected with a stopper portion, the output shaft of the motor 2 is located inside the stopper portion, the motor is provided with bolt holes, and the end plate is provided with through holes corresponding to the bolt holes and through holes corresponding to the stopper portion. The motor 2 is located inside the side plate, and the stopper portion of the motor passes through the through hole and cooperates with the mounting end face. The bolt passes through the shell 1, the through hole, and is threadedly connected to the bolt hole position of the motor. The output shaft of the motor 2 penetrates into the housing 1, and a gear box is arranged in the housing 1. The output shaft of the motor 2 is connected to the gear box, and the output end of the gear box is a lead screw; the lead screw drives the fork shaft 7 to rotate; the fork shaft 7 drives the load to rotate, and the load can be an air rudder.

[0035] like Figure 4 As shown, the displacement sensor heat insulation sleeve 10 of the present invention is a fully enclosed structure, which separates the displacement sensor 4 from the housing 1 and the fork shaft 7 as a whole, so as to prevent the two main heat sources from transferring and radiating heat to the displacement sensor 4. Specifically, the displacement sensor heat insulation sleeve 10 includes a heat insulation tube with one end closed, and the outer wall of the open end of the heat insulation tube is connected with a mounting lug, the displacement sensor 4 is installed in the heat insulation tube, and the displacement sensor 4 is connected with a mounting lug corresponding to the mounting lug one by one, the housing 1 is provided with a mounting hole, and the closed end of the heat insulation tube extends into the housing 1 through the mounting hole, and the mounting lug is located outside the housing, and the bolt passes through the mounting lug, the mounting lug and is connected to the housing 1.

[0036] like Figure 1 to Figure 6 The motor insulation sleeve 3, shell insulation pad 8, sector tooth insulation pad 9, and displacement sensor insulation sleeve 10 shown are all made of polyimide materials, the shell 1 is made of titanium alloy material, the pinion 5 and sector tooth 6 are made of aluminum alloy material, and high-temperature resistant non-metallic materials with a small thermal expansion coefficient can also be used.

[0037] The motor 2 and displacement sensor 4 of the present invention need to be products that can withstand temperatures above 120°C.

[0038] The contents not described in detail in this application specification belong to the common knowledge of those skilled in the art.

[0039] 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 high temperature resistant angle output servo actuator, characterized in that: It comprises a housing (1), a motor (2), a motor heat insulation sleeve (3), a displacement sensor (4), a pinion (5), a sector tooth (6), a shift fork shaft (7), a housing heat insulation pad (8), a sector tooth heat insulation pad (9) and a displacement sensor heat insulation sleeve (10); The motor (2) is fixedly connected to the outer wall of the housing (1); the output shaft of the motor (2) is used to drive the shift fork shaft (7) to rotate; the shift fork shaft (7) is rotationally connected to the housing (1); one end surface of the shift fork shaft (7) is fixedly connected to the sector tooth (6); the displacement sensor (4) is fixedly connected to the housing (1); the rotation shaft of the displacement sensor (4) is fixedly connected to the pinion gear (5); and the pinion gear (5) is meshed with the sector tooth (6); A shell heat insulation pad (8) is arranged between the shell (1) and the installation bulkhead, and two side surfaces of the shell heat insulation pad (8) are directly attached to the shell (1) and the installation bulkhead respectively; a motor heat insulation sleeve (3) is arranged between the motor (2) and the shell (1), a displacement sensor heat insulation sleeve (10) is arranged between the displacement sensor (4) and the servo mechanism shell (1), and a sector tooth heat insulation pad (9) is arranged between the sector tooth (6) and the fork shaft (7).

2. A high temperature resistant angle output servo actuator according to claim 1, characterized in that: A needle roller bearing (11) and a cylindrical roller bearing (12) are respectively installed at both ends of the shift fork shaft (7), and the needle roller bearing (11) and the cylindrical roller bearing (12) are fixedly installed in a servo mechanism housing (1) to support the shift fork shaft (7), the needle roller bearing (11) and the cylindrical roller bearing (12) are both made of high-temperature resistant high nitrogen steel material, and the shift fork shaft (7) is made of high-temperature alloy material.

3. The high temperature resistant angle output servo actuator according to claim 1, characterized in that: The needle roller bearing (11) is a needle roller bearing without an inner ring; the outer surface of the shift fork shaft (7) is coated with CrN with a thickness of 3 μm and a surface hardness of 58 to 60 HRC.

4. The high temperature resistant angle output servo actuator according to claim 1, characterized in that: The motor heat insulation sleeve (3) is a semi-enclosed structure; the surface of the motor (2) in contact with the housing (1) is covered by the motor heat insulation sleeve (3), and the surface of the motor (2) facing away from the housing (1) is not covered by the motor heat insulation sleeve (3).

5. A high temperature resistant angle output servo actuator according to claim 4, characterized in that: The surface of the shell (1) is provided with an arc-shaped installation groove, one end of the arc-shaped installation groove extends to the edge of the shell (1), and the other end of the arc-shaped installation groove is a mounting end face. The motor heat insulation sleeve (3) includes a side plate and an end plate. The side plate is a semi-cylindrical shape with openings at both ends. The side plate cooperates with the wall surface of the arc-shaped installation groove. The end plate is connected to one end of the side plate. The end plate contacts the mounting end face. The motor (2) is connected with a stopper portion. The output shaft of the motor (2) is located inside the stopper portion. The motor is provided with bolt holes. The end plate is provided with through holes corresponding to the bolt holes and through holes corresponding to the stopper portion. The motor (2) is located inside the side plate, and the stopper portion of the motor passes through the through hole to cooperate with the mounting end face. The bolt passes through the shell (1), the through hole, and is threadedly connected to the bolt hole position of the motor.

6. The high temperature resistant angle output servo actuator according to claim 1, characterized in that: The displacement sensor heat insulation sleeve (10) comprises a heat insulation tube with one end closed, the outer wall of the open end of the heat insulation tube is connected to a mounting ear, the displacement sensor (4) is installed in the heat insulation tube, the displacement sensor (4) is connected to mounting ears corresponding to the mounting ears one by one, the shell (1) is provided with a mounting hole, the closed end of the heat insulation tube extends into the shell (1) through the mounting hole, the mounting ear is located outside the shell, and a bolt passes through the mounting ear, the mounting ear and is connected to the shell (1).

7. The high temperature resistant angle output servo actuator according to claim 1, characterized in that: A groove is provided at a position of the sector tooth (6) directly opposite to the fork shaft (7), the sector tooth heat insulation pad (9) is located in the groove, and the fixing bolt passes through the sector tooth (6) and the sector tooth heat insulation pad (9) and is connected to the fork shaft (7).

8. The high temperature resistant angle output servo actuator according to claim 1, characterized in that: The motor heat insulation sleeve (3), the housing heat insulation pad (8), the sector tooth heat insulation pad (9), and the displacement sensor heat insulation sleeve (10) are all made of polyimide materials.

9. The high temperature resistant angle output servo actuator according to claim 1, characterized in that: The housing (1) is made of a titanium alloy material; the pinion (5) and the sector teeth (6) are made of an aluminum alloy material or a high-temperature resistant non-metallic material.

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