CN113716021A

CN113716021A - Small steering engine and manufacturing method thereof

Info

Publication number: CN113716021A
Application number: CN202110974789.0A
Authority: CN
Inventors: 肖平; 卢小玲; 雷声洪
Original assignee: Chengdu Zhili Technology Development Co ltd
Current assignee: Chengdu Zhili Technology Development Co ltd
Priority date: 2021-08-24
Filing date: 2021-08-24
Publication date: 2021-11-30
Anticipated expiration: 2041-08-24
Also published as: CN113716021B

Abstract

The application provides a miniaturized steering engine, wherein a shell comprises a cabin body and a tail cover; the front section in the cabin body is provided with a control panel; the front end of the cabin body is used for connecting an aircraft. The driving components are four groups and are arranged at the rear section in the cabin body; the driving part comprises a motor, a main shaft of the motor is provided with a screw rod, the screw rod is provided with a screw sleeve, and the screw rod is used for driving the screw sleeve to move along the axis direction; the outer wall of the screw sleeve is provided with a deflector rod. The displacement detecting member includes a contact piece and a potentiometer. The rudder shaft is provided with a set of driving components corresponding to each group; the rudder shaft is rotatably arranged in the cabin body; one side of the rudder shaft is provided with a shifting fork, the shifting fork is provided with a U-shaped groove, and the shifting lever is arranged in the U-shaped groove; the part of the rudder shaft, which is positioned on the outer side of the cabin body, is used for connecting the rudder wing. Has higher control precision and smaller overall volume. The application simultaneously provides a manufacturing method of the miniaturized steering engine, improves the streamline of the external profile of the steering engine and the smooth type of the whole surface, is favorable for further reducing the influence of wind resistance, and improves the guidance precision.

Description

Small steering engine and manufacturing method thereof

Technical Field

The invention belongs to the technical field of accurate guidance, and particularly relates to a miniaturized steering engine and a manufacturing method thereof.

Background

The steering engine is widely applied in the field of accurate guidance, and along with the gradual improvement of guidance accuracy and the increasing requirement on the miniaturization of the overall structure of the aircraft, the miniaturization degree of the mechanism of the steering engine finally influences the overall volume of the aircraft. The existing steering engine can not meet the use requirement of the overall miniaturization carrying of the aircraft gradually.

Disclosure of Invention

In order to solve the defects of the prior art, the invention provides a miniaturized steering engine which is simple in driving control structure, higher in control precision and smaller in overall size. Meanwhile, the manufacturing method of the miniaturized steering engine is provided, the streamline shape of the external outline of the steering engine and the smooth shape of the whole surface are improved, the influence of wind resistance is further reduced, and the guidance precision is improved.

In order to realize the purpose of the invention, the following scheme is adopted:

a miniaturized steering engine, comprising: the rudder shaft includes a housing, a driving member, a displacement detecting member, and a rudder shaft.

The shell comprises a cabin body which is of a circular tube structure; the rear end of the cabin body is provided with a tail cover; the front section in the cabin body is used for arranging a control panel; the front end of the cabin body is used for connecting an aircraft.

The driving components are four groups and are arranged at the rear section in the cabin body along the circumference array; the driving part comprises a motor, a main shaft of the motor is coaxially provided with a screw rod, the screw rod is coaxially sleeved with a screw sleeve, and the screw rod is only used for driving the screw sleeve to move along the axis direction; the main shaft of the motor is parallel to the axis of the cabin body; the outer wall of the screw sleeve is provided with a deflector rod which is vertical to the axis of the screw sleeve.

The displacement detection part comprises a contact piece and a potentiometer, the contact piece is arranged on the outer wall of the screw sleeve, and the potentiometer is arranged on the inner side of the cabin body.

The rudder shaft is provided with a set of driving components corresponding to each group; the rudder shaft is rotatably arranged in the cabin body, and the extension lines of the axes of the rudder shaft are vertically intersected with the axis of the cabin body; the deflector rod and the rudder shaft are arranged in parallel at intervals, and an interval is formed between the deflector rod and the axis of the cabin body; one side of the rudder shaft is provided with a shifting fork, the shifting fork is provided with a U-shaped groove, and the shifting lever is arranged in the U-shaped groove; the part of the rudder shaft, which is positioned on the outer side of the cabin body, is provided with a connecting structure for connecting the rudder wing.

Furthermore, the driving part also comprises a supporting plate and a positioning plate, the motor is vertically arranged on one side of the supporting plate, and the motor and the screw rod are respectively positioned on two sides of the supporting plate; the supporting plate is arranged at the rear section of the cabin body, the outer wall of the supporting plate is provided with a plurality of limiting grooves, and the inner wall of the cabin body is provided with raised lines corresponding to the limiting grooves; the positioning plate is arranged at the middle section of the cabin body and is provided with guide rods corresponding to the thread sleeves; the guide rod penetrates through one end of the screw sleeve in a sliding mode and is used for preventing the screw sleeve from rotating around the axis, and the other end of the screw sleeve is connected with the screw rod.

Furthermore, a rudder shaft cover is arranged at the part of the cabin body corresponding to the rudder shaft; one end of the rudder shaft, which is positioned in the cabin body, is rotatably connected to the positioning plate, the rudder shaft penetrates through the rudder shaft cover, and the middle section of the rudder shaft is rotatably connected to the rudder shaft cover; and a sliding bearing is arranged at the connecting part of the rudder shaft and the rudder shaft cover and is made of ceramics.

Furthermore, a circular ring seat is arranged on one side of the rudder shaft cover facing the shifting fork, a notch is formed in the circular ring seat corresponding to the set swing range of the shifting fork, and the shifting fork is located in the notch; the end surface of the circular ring seat is tightly pressed on the side surface of the positioning plate.

Furthermore, the outer wall of the rear section of the cabin body is of a conical structure, the bottom surface of the tail cover is of a spherical structure, and the joint of the tail cover and the cabin body is smooth and excessive.

Furthermore, the cabin body side wall is provided with a mounting hole corresponding to the position where the potentiometer is mounted, so that the potentiometer can be mounted from the outside, a plugging cover is embedded in the mounting hole and made of polytetrafluoroethylene, and the outer wall of the plugging cover is matched with the outer wall of the cabin body.

Furthermore, a U-shaped lining is inlaid in the inner wall of the U-shaped groove, an annular sleeve is sleeved on the periphery of the deflector rod in a rotating mode, the U-shaped lining is sleeved with the annular sleeve, and the annular sleeve and the U-shaped lining are both made of ceramic materials.

A manufacturing method of a miniaturized steering engine is used for manufacturing the miniaturized steering engine and comprises the following steps:

a pre-installation process, wherein the rudder shaft cover is installed on the outer wall of the cabin body by adopting screws, and the tail cover is installed on the cabin body by adopting screws;

machining, namely integrally machining the outer wall of the shell by using a machine tool; meanwhile, the head parts of the rudder shaft cover, the cabin body, the tail cover and the connecting screw are turned in a material removing mode, so that the outer wall of the shell forms an integral smooth structure to reduce wind resistance;

disassembling, namely disassembling the rudder shaft cover, the cabin body and the tail cover;

an assembling procedure, namely, the control panel, the driving component and the displacement detection component are arranged in the cabin body; the rudder shaft, rudder shaft cover and tail cover are then assembled.

Further, the screw removed in the disassembling step needs to be aligned with the attachment position before removal when attachment is performed in the assembling step.

The invention has the beneficial effects that:

1. the aircraft has a smaller integral structure, and is favorable for being carried on a smaller aircraft for use; the whole appearance is elongated centrum structure, and the bottom is the ball-type, helps reducing the influence of windage to improve the guidance precision.

2. The external structure of the steering engine, such as the steering shaft cover, the cabin body and the tail cover, adopts a process method of performing integral processing after pre-installation, so that the overall streamline and smoothness of the external part of the steering engine are improved, the influence of wind resistance is further reduced, and the guidance precision is improved.

3. The screw rod is adopted to drive the screw sleeve to move along the axis so as to drive the rudder shaft to rotate, the structure is more compact, and the screw sleeve has a reverse self-locking function, namely the screw rod cannot be rotated by the screw sleeve through axial movement, so that the stability of the rudder shaft is ensured, and the rudder shaft cannot rotate by itself. And this application directly utilizes the silk cover to stir the rudder axle, has reduced middle transfer mechanism, and transfer efficiency is higher, and because transfer mechanism is less, the clearance between the structure that needs to eliminate also still less, consequently the transmission precision is higher. Although the similar worm and worm wheel mechanism also has a self-locking function, the structure volume is large, and the diameter of the shell of the steering engine can be increased; therefore, the diameter of the outer contour of the steering engine can be further reduced by adopting a transmission mechanism of the screw rod and the screw sleeve, so that the steering engine is further miniaturized.

Drawings

The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present disclosure.

Fig. 1 shows an internal structure of a steering engine.

Fig. 2 shows an enlarged view at a in fig. 1.

Fig. 3 shows a configuration diagram of the driving part.

Fig. 4 shows a block diagram of the rudder shaft.

Fig. 5 is a diagram showing the structure and connection relationship between the driving member and the rudder shaft.

Fig. 6 shows the internal structure of the cabin.

Figure 7 shows an external view of the steering engine.

The labels in the figure are: the device comprises a shell-10, a cabin-11, convex strips-111, a tail cover-12, a control panel-13, a rudder shaft cover-14, a circular ring seat-141, a sliding bearing-15, a blocking cover-16, a driving part-20, a motor-21, a screw rod-22, a screw sleeve-23, a deflector rod-231, a support plate-24, a limiting groove-241, a positioning plate-25, a circular sleeve-26, a guide rod-251, a displacement detection part-30, a contact piece-31, a potentiometer-32, a rudder shaft-40, a shifting fork-41, a U-shaped groove-411 and a U-shaped lining-42.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings, but the described embodiments of the present invention are a part of the embodiments of the present invention, not all of the embodiments of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are usually placed in when used, and are only for convenience of describing the present invention and simplifying the description. The terms "first," "second," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance. The terms "parallel", "perpendicular", etc. do not require that the components be absolutely parallel or perpendicular, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; either directly or indirectly through intervening media, or through both elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Examples

As shown in fig. 1 and 6, a miniaturized steering engine includes: a housing 10, a driving member 20, a displacement detecting member 30, and a rudder shaft 40.

Specifically, the shell 10 includes a cabin 11, and the cabin 11 is a circular tube structure; the rear end of the cabin 11 is provided with a tail cover 12; the front section inside the cabin 11 is used for arranging a control panel 13; the front end of the cabin 11 is used for connecting an aircraft.

Specifically, the driving members 20 are four groups and are circumferentially arranged at the rear portion of the interior of the cabin 11. The driving member 20 and the control board 13 are respectively provided at front and rear sections inside the cabin 11 in the longitudinal direction. One of the purposes is to reduce the diameter of the housing 10, so that the housing 10 is in a slender shape structure to reduce the influence of wind resistance; the second purpose is to isolate the control board 13 from the driving part 20, because the driving part 20 is provided with the motor 21, the motor 21 not only generates heat but also generates electromagnetism when working, and there is a risk of influencing the normal work of the control board 13.

Specifically, the driving part 20 includes a motor 21, a spindle of the motor 21 is coaxially provided with a screw rod 22, the screw rod 22 is coaxially sleeved with a screw sleeve 23, and the screw rod 22 is only used for driving the screw sleeve 23 to move along the axial direction. The main shaft of the motor 21 is parallel to the axis of the nacelle 11. The outer wall of the screw sleeve 23 is provided with a driving lever 231, and the driving lever 231 is perpendicular to the axis of the screw sleeve 23.

Specifically, the displacement detecting member 30 includes a contact piece 31 and a potentiometer 32, the contact piece 31 is disposed on the outer wall of the screw sleeve 23, and the potentiometer 32 is disposed on the inner side of the cabin 11.

Specifically, the rudder shaft 40 is provided with one set corresponding to each set of driving components 20; the rudder shaft 40 is rotatably arranged on the cabin body 11, and the extension lines of the axes of the rudder shaft 40 are vertically intersected with the axis of the cabin body 11; the shift rod 231 and the rudder shaft 40 are arranged in parallel at intervals, and an interval is formed between the shift rod 231 and the axis of the cabin 11; one side of the rudder shaft 40 is provided with a shifting fork 41, the shifting fork 41 is provided with a U-shaped groove 411, and the shifting rod 231 is arranged in the U-shaped groove 411.

More specifically, the rudder shaft 40 is provided with a connection structure at a position outside the nacelle 11 for connecting the rudder wing. The connecting structure can be a connecting plate or a connecting hole structure, or a structure combining the connecting plate and the connecting hole as shown in fig. 4, so as to ensure the stability of the connection of the rudder wing. The connecting hole can be a threaded hole or a through hole.

During operation, the screw rod 22 rotates to drive the screw sleeve 23 to move axially, the shift lever 231 arranged on the outer wall of the screw sleeve 23 directly shifts the shift fork 41, and the shift fork 41 drives the rudder shaft 40 to rotate, so as to control the swing of the rudder wing, and thus adjust the flight direction. When the screw sleeve 23 moves, the movable contact 31 slides on the membrane of the potentiometer 32, the sliding distance of the contact 31 is measured by the potentiometer 32, and then the rotating angle of the rudder shaft 40 is converted.

Preferably, as shown in fig. 3, 5 and 6, the driving part 20 further includes a supporting plate 24 and a positioning plate 25, the motor 21 is vertically installed at one side of the supporting plate 24, and the motor 21 and the lead screw 22 are respectively located at both sides of the supporting plate 24. In order to enhance the stability of the installation of the motor 21, a positioning hole is processed on the inner surface of the tail cover 12 for installing the rear end of the motor 21 and further fixing the motor 21. The support plate 24 is arranged at the rear section of the cabin body 11, the outer wall of the support plate 24 is provided with a plurality of limiting grooves 241, the inner wall of the cabin body 11 is provided with convex strips 111 corresponding to the limiting grooves 241, and the convex strips 111 are matched with the limiting grooves 241 to limit the support plate 24 so as to prevent the support plate 24 from rotating; the positioning plate 25 is arranged at the middle section of the cabin body 11, and the positioning plate 25 is provided with guide rods 251 corresponding to the thread sleeves 23. The guide rod 251 is slidably disposed through one end of the screw sleeve 23 for preventing the screw sleeve 23 from rotating around the axis, and the other end of the screw sleeve 23 is connected to the screw rod 22. The screw bushing 23 slides only in the axial direction of the guide rod 251. The guide rod 251 is used for preventing the wire sleeve 23 from rotating around the axis, and meanwhile, the wire sleeve 23 is connected in a guiding mode, so that the connection stability of the wire sleeve 23 is improved, the vibration of the tail end of the wire sleeve 23 is reduced, and the overall stability of the steering engine during operation is improved. The positioning plate 25 is also used to press and fix the control board 13 to the front section of the cabin 11, and also serves to isolate the control board 13 from the driving part 20. The positioning plate 25 is also used for rotatably connecting one end of the rudder shaft 40, so that other parts used for connecting the rudder shaft 40 are reduced, the structure is simplified, and the whole weight of the steering engine is reduced.

Further preferably, a rudder shaft cover 14 is further arranged at a position of the cabin 11 corresponding to the rudder shaft 40; one end of the rudder shaft 40 positioned in the cabin 11 is rotatably connected to the positioning plate 25, the rudder shaft 40 passes through the rudder shaft cover 14, and the middle section of the rudder shaft 40 is rotatably connected to the rudder shaft cover 14; the sliding bearing 15 is arranged at the connecting part of the rudder shaft 40 and the rudder shaft cover 14, the sliding bearing 15 is made of ceramics, the sliding bearing 15 not only bears the radial pressure caused by the rotation of the rudder shaft 40, but also bears the pressure along the axial direction applied to the rudder shaft 40 by the rudder shaft cover 14, and the pressure is used for preventing the rudder shaft 40 from moving along the axial direction so as to improve the connecting stability of the rudder shaft 40.

Preferably, as shown in fig. 5, a circular ring seat 141 is disposed on one side of the rudder shaft cover 14 facing the shift fork 41, a notch 1411 is disposed on the circular ring seat 141 corresponding to the swing range set by the shift fork 41, the shift fork 41 is located in the notch 1411, the notch 1411 is used to limit the swing limit position of the shift fork 41, and the rudder shaft 40 is prevented from exceeding the swing range; the end face of the circular ring seat 141 is pressed on the side face of the positioning plate 25, the positioning plate 25 is pressed and fixed through the circular ring seat 141 by the rudder shaft cover 14, the number of connecting screws is reduced, and assembly is facilitated.

Preferably, as shown in fig. 1 and 6, the outer wall of the rear section of the cabin 11 is a conical structure, the bottom surface of the tail cover 12 is a spherical structure, and the joint between the tail cover 12 and the cabin 11 is smooth and excessive, so as to improve the overall streamline structure of the steering engine and reduce the air resistance.

Preferably, as shown in fig. 1 and 2, a mounting hole is formed in a side wall of the cabin 11 at a position corresponding to the position where the potentiometer 32 is mounted, so that the potentiometer 32 can be mounted from the outside, a blocking cover 16 is embedded in the mounting hole and used for blocking the mounting hole, the blocking cover 16 is made of polytetrafluoroethylene, and an outer wall of the blocking cover 16 is matched with an outer wall of the cabin 11, so that the housing 10 has a smooth outer wall, and the influence of wind resistance is reduced; further preferably, the surface of the blocking cover 16 may be polished after being installed on the cabin 11, so that the surface and the surface of the cabin 11 form a smooth integral structure; after the plugging cover 16 is installed on the cabin 11, the outer wall of the cabin 11 may be integrally turned, so that the plugging cover 16 and the outer surface of the cabin 11 form an integral structure.

Preferably, as shown in fig. 4, a U-shaped liner 42 is embedded in the inner wall of the U-shaped slot 411, an annular sleeve 26 is rotatably sleeved on the periphery of the shift lever 231, the annular sleeve 26 is disposed on the U-shaped liner 42, and the annular sleeve 26 and the U-shaped liner 42 are both made of ceramic materials, so as to reduce friction resistance and improve transmission sensitivity.

A manufacturing method of a miniaturized steering engine is used for manufacturing the miniaturized steering engine, and comprises the following steps:

and a pre-assembling step of installing the rudder shaft cover 14 on the outer wall of the cabin 11 by using screws, installing the tail cover 12 on the cabin 11 by using screws, and tightening the screws according to a set torque.

And a machining step of integrally machining the outer wall of the housing 10 by using a machine tool. Meanwhile, the rudder shaft cover 14, the cabin body 11, the tail cover 12 and the head of the connecting screw are processed in a material removing mode, such as turning or grinding, so that the outer wall of the shell 10 forms an integral smooth structure, wind resistance is reduced, and guidance precision is improved.

And a disassembling process, namely disassembling the rudder shaft cover 14, the cabin body 11 and the tail cover 12, and marking the screws for connection with the corresponding connecting holes in a one-to-one correspondence manner when the screws are disassembled so as to facilitate one-to-one correspondence assembly in the assembling process.

An assembling step of installing the control board 13, the driving member 20, and the displacement detecting member 30 into the cabin 11; the rudder shaft 40, the rudder shaft cover 14 and the tail cover 12 are then assembled.

Preferably, the screws detached in the detaching process need to be consistent with the mounting positions before detachment in the assembling process, so that the screws and the screw holes are mounted in a one-to-one correspondence manner, and the outer wall of the whole steering engine after temporary assembly keeps a state after machining in the machining process.

The foregoing is only a preferred embodiment of the present invention and is not intended to be exhaustive or to limit the invention. It will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the scope of the invention.

Claims

1. A miniaturized steering wheel which characterized in that includes:

the shell (10) comprises a cabin body (11), and the cabin body (11) is of a circular tube structure; the rear end of the cabin body (11) is provided with a tail cover (12); the front section in the cabin body (11) is used for arranging a control panel (13); the front end of the cabin body (11) is used for connecting an aircraft;

the driving components (20) are arranged in the rear section of the cabin body (11) along the circumference array in four groups; the driving part (20) comprises a motor (21), a lead screw (22) is coaxially arranged on a main shaft of the motor (21), a screw sleeve (23) is coaxially sleeved on the lead screw (22), and the lead screw (22) is used for driving the screw sleeve (23) to move along the axis direction; the main shaft of the motor (21) is parallel to the axis of the cabin body (11); the outer wall of the screw sleeve (23) is provided with a deflector rod (231), and the deflector rod (231) is vertical to the axis of the screw sleeve (23);

the displacement detection component (30) comprises a contact piece (31) and a potentiometer (32), the contact piece (31) is arranged on the outer wall of the screw sleeve (23), and the potentiometer (32) is arranged on the inner side of the cabin body (11);

a rudder shaft (40) which is provided with a set of corresponding driving components (20); the rudder shaft (40) is rotatably arranged on the cabin body (11), and the extension lines of the axes of the rudder shaft (40) are vertically intersected with the axis of the cabin body (11); the deflector rod (231) and the rudder shaft (40) are arranged in parallel at intervals, and an interval is formed between the deflector rod (231) and the axis of the cabin body (11); one side of the rudder shaft (40) is provided with a shifting fork (41), the shifting fork (41) is provided with a U-shaped groove (411), and the shifting rod (231) is arranged in the U-shaped groove (411); the part of the rudder shaft (40) positioned at the outer side of the cabin body (11) is provided with a connecting structure for connecting a rudder wing.

2. The small-sized steering engine according to claim 1, wherein the driving part (20) further comprises a support plate (24) and a positioning plate (25), the motor (21) is vertically installed on one side of the support plate (24), and the motor (21) and the screw rod (22) are respectively located on two sides of the support plate (24); the supporting plate (24) is arranged at the rear section of the cabin body (11), the outer wall of the supporting plate (24) is provided with a plurality of limiting grooves (241), and the inner wall of the cabin body (11) is provided with convex strips (111) corresponding to the limiting grooves (241); the positioning plate (25) is arranged at the middle section of the cabin body (11), and guide rods (251) are arranged on the positioning plate (25) corresponding to the thread sleeves (23); the guide rod (251) is arranged at one end of the screw sleeve (23) in a sliding mode and used for preventing the screw sleeve (23) from rotating around an axis, and the other end of the screw sleeve (23) is connected with the screw rod (22).

3. The miniaturized steering engine according to claim 2, wherein a rudder shaft cover (14) is further arranged at a position of the cabin (11) corresponding to the position where the rudder shaft (40) is installed; one end of the rudder shaft (40) positioned in the cabin body (11) is rotatably connected to the positioning plate (25), the rudder shaft (40) penetrates through the rudder shaft cover (14), and the middle section of the rudder shaft (40) is rotatably connected to the rudder shaft cover (14); the connecting part of the rudder shaft (40) and the rudder shaft cover (14) is provided with a sliding bearing (15), and the sliding bearing (15) is made of ceramics.

4. The miniaturized steering engine according to claim 3, characterized in that a circular ring seat (141) is arranged on one side of the steering shaft cover (14) facing the shifting fork (41), a notch (1411) is formed in the circular ring seat (141) corresponding to the set swing range of the shifting fork (41), and the shifting fork (41) is located in the notch (1411); the end surface of the circular ring seat (141) is pressed on the side surface of the positioning plate (25).

5. The miniaturized steering engine according to claim 1, wherein the outer wall of the rear section of the cabin (11) is in a conical structure, the bottom surface of the tail cover (12) is in a spherical structure, and the joint of the tail cover (12) and the cabin (11) is smooth and excessive.

6. The small-sized steering engine according to claim 1, wherein the side wall of the cabin (11) is provided with a mounting hole corresponding to the position where the potentiometer (32) is mounted, a plugging cover (16) is embedded in the mounting hole, the plugging cover (16) is made of polytetrafluoroethylene, and the outer wall of the plugging cover (16) is matched with the outer wall of the cabin (11).

7. The small-sized steering engine according to claim 1, wherein a U-shaped lining (42) is embedded in the inner wall of the U-shaped groove (411), an annular sleeve (26) is rotatably sleeved on the periphery of the shifting rod (231), the annular sleeve (26) is arranged on the U-shaped lining (42), and the annular sleeve (26) and the U-shaped lining (42) are both made of ceramic materials.

8. A method for manufacturing a miniaturized steering engine, characterized by comprising the steps of:

a pre-assembly step of installing the rudder shaft cover (14) on the outer wall of the cabin body (11) by using screws and installing the tail cover (12) on the cabin body (11) by using screws;

machining, namely integrally machining the outer wall of the shell (10) by using a machine tool; meanwhile, the head parts of the rudder shaft cover (14), the cabin body (11), the tail cover (12) and the connecting screw are processed in a material removing mode, so that the outer wall of the shell (10) forms an integral smooth structure to reduce wind resistance;

a disassembly step of disassembling the rudder shaft cover (14), the cabin body (11) and the tail cover (12);

an assembly step of installing the control board (13), the drive component (20), and the displacement detection component (30) into the cabin (11); the rudder shaft (40), rudder shaft cover (14) and tail cover (12) are then assembled.

9. The method of claim 8, wherein the screw removed in the disassembly step is required to be aligned with the mounting position before the disassembly step when the screw is mounted in the assembly step.