CN104670463A - Electric steering mechanism - Google Patents

Abstract

The invention discloses an electric steering mechanism, which comprises a motor, a linear displacement conversion device and two position feedback units, and the position feedback unit comprises a position sensor connected with the rotor transmission of the motor; the motor is directly converted to the linear displacement without a reducer. The device is connected to drive the movement of the linear displacement conversion device. When the motor is powered off, the manual part can be inserted into the rear of the motor to directly drive the motor rotor. The position feedback unit adopts a dual redundant feedback structure design. The linear displacement device is a screw nut and a roller wire. The electric steering mechanism also includes a guide mechanism, which is a roller linear guide with a damping slider. The invention provides an electric steering mechanism for ships, which has the advantages of high load capacity, high reliability, quietness, miniaturization, and convenient maintenance, and can realize the goal of fully electric ships.

Description

An electric steering mechanism

technical field

The invention relates to an electric steering mechanism, in particular to an electric steering mechanism for ships.

Background technique

The electric steering mechanism for ships belongs to the electric actuators used in special environments. This is because of the objective existence of various excitation sources such as main engines, auxiliary engines, propellers, waves, etc., so warships, civilian ships, sea ships or inland rivers Ships have different degrees of vibration problems. Ship vibration affects the safety of the hull structure and the reliable operation of related machinery, interferes with the normal operation of instruments and equipment, and at the same time causes great noise pollution and harm to the environment. Especially in military ships, the vibration of the power plant will seriously affect their concealment and combat effectiveness. Therefore, the electric steering mechanism for ships is required to have high reliability under vibration and water surface environment, and at the same time, it should not produce large noise.

At present, there are mainly two types of steering mechanisms on ships, one is hydraulic steering mechanisms, and the other is electric steering mechanisms.

The hydraulic rudder mechanism generally uses an electric motor to drive the oil pump, so it is also called the electro-hydraulic rudder mechanism. The hydraulic rudder mechanism uses oil as the energy transfer medium, and uses the incompressibility of oil and the controllability of flow, pressure and flow direction to realize rudder steering. The reliability of the electro-hydraulic steering gear is low. In routine operation, problems such as no rudder, only one-way steering, too slow rudder speed, empty rudder, and discrepancy between the actual rudder angle and the steering angle are prone to occur; , The liquid circulating in the pipeline of the hydraulic system, due to the change of the use mode, such as the opening and closing of the valve, will produce cavitation and hydraulic shock, causing vibration and noise of the hydraulic device.

In the prior art, the electric steering mechanism has the following three types. The first type is the DDZ-II and III electric steering mechanism designed and produced by my country in the 1980s. The main problems are poor sealing of the shell and low insulation level. Under the harsh working environment on board, the parts are prone to rust and the work is unreliable. The position feedback unit adopts a differential transformer, which has low reliability in the vibration environment. Low reliability.

The second type of electric steering mechanism is the electric steering mechanism of Rimitork Company in the United States in the mid-1990s. It has been found through tests that its reliability is low and there is a phenomenon of coasting.

The third type of electric steering mechanism is the IQM and AQ series of British ROTORK company. Its main problem is poor reliability. It happened; 2) IQM series electric steering mechanism has set a small dead zone, which caused the actuator to oscillate; 3) The IQM electric steering mechanism disengaged the clutch due to improper operation and could not be operated manually; 4) The self-provided battery was damaged due to humidity Wait for the power failure to cause the IQ manipulator and control operation to fail, etc. In addition, both series of electric steering mechanisms have the problem of being too large, which makes it a difficult problem to arrange the electric steering mechanisms reasonably in the narrow space on the ship.

Contents of the invention

Based on the deficiencies in the prior art, the first object of the present invention is to provide a highly reliable electric steering mechanism to meet the requirements of reliable operation in vibration, high humidity of fresh water and high salt humidity working environments at sea.

The second object of the present invention is to provide a high-load, high-thrust electric steering mechanism.

The third object of the present invention is to provide a quiet electric steering mechanism, which has obvious effects of vibration reduction and noise reduction. Compared with the traditional hydraulic system steering mechanism, the vibration is small during operation, which not only meets the requirements of military ships, but also can be used for quiet conventional submarines.

The fourth object of the present invention is to provide an easy-to-maintain miniaturized electric steering mechanism to meet the requirements of narrow space on ships.

To achieve the above object, the present invention provides the following technical solutions:

An electric steering mechanism, including a motor, a linear displacement conversion device and a position feedback unit, the position feedback unit is two position sensors connected with the motor rotor drive; the motor is directly connected to the linear displacement conversion device without a reducer, and the drive Linear displacement conversion device movement. Due to the use of two position sensors, it is a dual redundant position feedback structure, and the system reliability is high; the motor directly drives the linear displacement conversion device without a reducer, the number of mechanical parts is small, the structure is simple, and the reliability is high. body size.

In a further technical solution, the position sensor is an encoder. Compared with other position sensors, the encoder has the characteristics of small size and high precision, which effectively reduces the volume of the position feedback unit.

In a further technical solution, hobbing gears are provided on the two encoder shafts, a large gear is fixed on the rotor of the motor, and the large gear meshes with the hobbing gears on the two encoder shafts for transmission. When one of the position sensors fails, it can immediately switch to another position sensor to realize the dual redundancy design of the system position feedback and improve the reliability of the position feedback unit.

In a further technical solution, the rear end of the motor is provided with an interface matching the manual operation part, and the manual part can be inserted into the motor to directly drive the rotor of the motor, and the manual part can be a crank handle, a handle or a hand wheel. When the electric steering mechanism fails and loses power, the mechanism can be manually operated, which effectively improves the reliability of the electric steering mechanism.

In a further technical solution, the linear displacement conversion device is a screw transmission device. This type of transmission component has the characteristics of high load, impact resistance and long life, making it possible for the electric steering mechanism to have high load and large thrust.

In a further technical solution, the linear displacement conversion device is a screw nut drive, a roller screw or a planetary roller screw. The planetary roller screw can avoid the setting of the ball screw return device, and realize high-speed drive with small lead, small vibration and low noise.

In a further technical solution, the electric steering mechanism also includes a guiding mechanism.

In a further technical solution, the guide mechanism uses a roller linear guide, including a rolling slider, a rolling guide, and a roller element. The rolling slider is installed on the rolling guide, and several roller elements are located at the contact between the rolling slider and the rolling guide. between faces. This kind of guide rail has high load capacity and rigidity, can withstand greater rotational torque, and has the characteristics of low noise and long-term maintenance-free.

In a further technical solution, the roller linear guide further includes a vibration-damping slider, and the vibration-damping slider and the rolling slider are installed side by side on the rolling guide. The damping slider has a steel structure main body, the damping slider is matched with the corresponding guide rail (grinding or scraping), and an oil hole is drilled, and lubricating oil is injected between the vibration damping slider and the guide rail through the oil hole. The guide surface of the damping slider is not in direct contact with the surface of the guide rail, and is filled with lubricating oil. Due to the small gap, an oil film is formed. This layer of oil film can act as a squeeze oil film shock absorber, which can achieve a good vibration reduction effect.

In a further technical solution, the damping slider can form a gap of 0.03mm between all the guide surfaces and the adjacent parts. Since the 0.03mm oil film is very thin, it can produce capillary action, so the oil consumption is very little , When working, just like a rolling slider, you only need to drip lubricating oil into the oil hole of the damping slider regularly, and the maintenance performance is good. This roller linear guide with vibration-damping sliders not only maintains the characteristics of light and fast operation of the rolling linear guide, but also has the advantage of good vibration-damping performance of the sliding linear guide.

In a further technical solution, a layer of sliding support material is sprayed on the inner surface of the damping slider.

In a further technical solution, the linear displacement conversion device includes three radial supports, the first radial support is the main radial support, and is composed of a pair of angular contact bearings installed back to back, and the inner ring of the bearing is matched with the lead screw. The outer ring of the bearing is matched with the inner hole of the housing bearing. The second radial support is borne by two support rings with a certain axial width on the actuating rod. The third radial support is the auxiliary support part of the front end cover. The working conditions are more complicated, and it is easy to produce irregular movements and vibrations of different frequencies, resulting in noise phenomena. The addition of auxiliary supports can effectively avoid vibration and noise.

In a further technical solution, the auxiliary supporting part of the front end cover includes a stiletto ring, and the stiletto ring is installed in a matching groove on the inner surface of the sliding bearing. Slaid ring has high bearing capacity, good friction characteristics, can absorb and attenuate mechanical vibration, and can play a good role in supporting and damping vibration.

In a further technical solution, the inner surface of the sliding bearing is sprayed with a solid lubricating material to have a good lubricating effect.

In a further technical solution, a special maintenance window is provided on the outside of the electric steering mechanism, which is convenient for maintenance and easy to operate.

Description of drawings

Fig. 1 is a schematic cross-sectional structure A of an electric steering mechanism provided by the present invention.

Fig. 2 is a schematic cross-sectional structure B of the electric steering mechanism provided by the present invention.

Fig. 3 is a schematic diagram of the appearance of the electric steering mechanism provided by the present invention.

Fig. 4 is a schematic cross-sectional structural diagram A of the guide mechanism in Fig. 2 .

FIG. 5 is a schematic cross-sectional structure B of the guide mechanism in FIG. 2 .

Fig. 6 is a partially enlarged view of the auxiliary supporting part of the front end cover in Fig. 1 .

Fig. 7 is a schematic diagram of the appearance of the auxiliary support part of the front cover in Fig. 1 .

FIG. 8 is a schematic cross-sectional structure diagram of the position feedback unit in FIG. 1 .

FIG. 9 is a schematic diagram of the end face structure of the position feedback unit in FIG. 1 .

In the figure: 1-manual parts, 2-position feedback unit, 3-motor, 4-linear displacement conversion device, 5-front end cover auxiliary support part, 6-guiding mechanism, 7-flat key, 8-plug, 9- rings. 21-encoder, 22-encoder shaft, 23-angular contact ball bearing, 24-encoder seat, 25-encoder cover, 26-screw, 27-big gear, 28-screw. 41-Inner ring locking nut, 42-Outer ring locking nut, 43-Taper end set screw, 44-Angular contact bearing, 45-Shell, 46-Sealing gasket, 47-Cover plate, 48-Screw, 49 -leading screw, 410-screw, 411-support ring, 412-nut, 413-actuating rod, 414-set screw. 51-front-end cover, 52-screw, 53-sliding bearing, 54-sleeve ring, 55-screw, 56-tapered pin. 61-rolling slider, 62-vibration-damping slider, 63-rolling guide, 64-roller element, 65-screw, 66-set screw, 67-screw. E-first support, F-second support, G-third support, H-maintenance window, I-oil film, J-oil injection hole.

Detailed ways

The present invention will be clearly and described in detail below in conjunction with the accompanying drawings. The description in this part is only exemplary and explanatory, and should not have any limiting effect on the protection scope of the present invention.

Apparently, the described embodiments are only some of the embodiments, not all of them. Based on this embodiment, all embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention. In this part, the orientation words such as front and back refer to the extension direction of the linear displacement conversion device, where the extension direction of the linear displacement conversion device is the front, and the opposite direction is the rear.

Please refer to FIG. 1 . FIG. 1 is a partial cross-sectional structural schematic diagram A of an electric steering mechanism provided by the present invention.

The electric steering mechanism provided by the present invention includes a manual part 1, a position feedback unit 2, a motor 3, a linear displacement conversion device 4, an auxiliary support part 5 of the front end cover, a guide mechanism 6, a flat key 7, a plug 8 and a suspension ring 9. In this embodiment, the manual component 1 is a crank handle, of course, a hand wheel or a handle can also be selected. The manual component 1 can be inserted from the rear end of the motor 3 to directly drive the rotor of the motor to achieve manual operation. In the case of a motor failure and power failure, manual operation can be performed, which improves the reliability of the system. The rotor of the motor 3 directly drives the linear displacement conversion device 4 through the flat key 7, and the guide mechanism 6 makes the linear displacement conversion device 4 run more lightly, reducing vibration and noise. The auxiliary support part 5 of the front cover supports the front end of the linear displacement conversion device 4, and the position feedback unit 2 is connected with the rotor drive of the motor 3 to provide a position feedback signal for the system. After the electric steering mechanism is assembled, the plug 8 seals the mechanism cavity to prevent dust and sundries from entering the mechanism interior, and the lifting ring 9 is installed on the housing 45 for hoisting.

The linear displacement conversion device 4 includes: inner ring locking nut 41, outer ring locking nut 42, taper end set screw 43, angular contact bearing 44, housing 45, gasket 46, cover plate 47, screw 48, lead screw 49, screw 410, support ring 411, nut 412, actuating rod 413, set screw 414.

On the rear end shaft shoulder of the screw 49, a pair of angular contact bearings 44 are installed back to back, the bearing inner ring of the angular contact bearing 44 cooperates with the screw 49, the bearing outer ring of the angular contact bearing 44 and the bearing inner ring of the housing 45 Hole matching, the front end face of the angular contact bearing 44 is axially positioned by the shaft shoulder of the screw 49 and the bearing inner hole structure of the housing 45, and the rear end face of the angular contact bearing 44 is fixed by the inner ring locking nut 41 and the outer ring locking nut 42 Axial positioning. The nut 412 surrounds the lead screw 49 and is arranged coaxially. The nut 412 is installed in the corresponding inner hole of the actuating rod 413. The rear end surface of the nut 412 is fixedly connected with the actuating rod 413 by seven screws 410. The actuating rod 413 has a certain A support ring 411 with an axial width, the support ring 411 is matched with the inner hole of the housing 45 , and the opening at the front end of the actuating rod 413 is sealed by the plug 8 .

When the rotor of the motor 3 rotates, the screw 49 is driven by the flat key 7 to perform a spiral motion, and the nut 412 and the actuating rod 413 move axially relative to the screw 49 and reciprocate linearly in the inner hole of the housing 45 synchronously. , the actuating rod 413 makes a linear reciprocating motion in the inner hole of the auxiliary support member 5 at the same time.

It can be seen from the above that the linear displacement conversion device 4 in this embodiment is a transmission form of a screw nut, and the linear displacement conversion device 4 can also be a roller screw or a planetary roller screw.

Please refer to Fig. 2, Fig. 2 is a schematic cross-sectional structure B of the electric steering mechanism provided by the present invention. The linear displacement conversion device 4 has three radial supports. The first radial support is the main radial support E, which is composed of a pair of angular contact ball bearings 44 installed on the lead screw 49 and at the same time installed in the inner hole of the bearing at the rear end of the housing 45. The bearings are installed back to back, increasing the bearing Axial support stiffness. The second radial support F, the two support rings 411 on the actuating rod 413 cooperate with the inner hole of the housing 45 to realize the simultaneous support of the leading screw 49 and the actuating rod 413, which makes the leading screw 49 and the nut 412 not Bearing radial load, preventing the sticking and excessive wear of the transmission mechanism. The material of the support ring 411 is different from the material of the housing 45, thereby forming sliding friction of different materials, effectively preventing the occurrence of gluing when the instantaneous speed is too high; the third radial support is the auxiliary support G of the front end cover, which is assisted by the front end cover The supporting member 5 is used to support the front end of the actuating rod 413 .

The fixing method of the radial support is introduced in detail below, the fixing of the angular contact bearing 44 at the first radial support E: the inner ring is fixed on the lead screw 49 through the inner ring locking nut 41, and the radial direction of the inner ring locking nut 41 Drill threaded holes symmetrically in the direction, and screw in the set screws 43 with tapered ends respectively to prevent loosening. Please refer to Figure 1. The anti-loosening threaded hole of the inner ring lock nut 41 is close to the tail of the thread, so that the thread relief groove on the lead screw does not bear radial load; the outer ring of the bearing is fixed to the bearing inner hole at the rear end of the housing 45 through the outer ring lock nut 42 , the outer ring locking nut 42 is also locked by the tapered set screw 43, please refer to Figure 1, and the outer ring locking nut 42 is locked by the flat end set screw 414, please refer to Figure 2.

Please combine Figure 2, Figure 4 and Figure 5, Figure 2 is a schematic cross-sectional structure B of the electric steering mechanism provided by the present invention, and Figure 4 is a schematic cross-sectional structural schematic A of the guiding mechanism in Figure 2 . FIG. 5 is a schematic cross-sectional structure B of the guide mechanism in FIG. 2 .

In this embodiment, the guide mechanism 6 is a roller linear guide, and a vibration-damping slider 62 is used in combination. The guide mechanism 6 includes: a rolling slider 61 , a damping slider 62 , a rolling guide rail 63 , a roller element 64 , a screw 65 , a set screw 66 , and a screw 67 .

The guide mechanism 6 is integrally installed in the inner cavity of the housing 45 , the rolling slider 61 is installed on the rolling guide rail 63 , and several roller elements 64 are located between the contact surfaces of the rolling slider 61 and the rolling guide rail 63 . The damping slider 62 comprises a steel structure main body, and its inner surface is sprayed with a layer of sliding support material. The damping slider 62 is matched with the corresponding rolling guide rail 63 (grinding or scraping), and the oil hole J is drilled, and then Installed side by side with the rolling slider 61 on the rolling guide rail, a guiding mechanism with vibration damping function is formed. The damping slider 62 is not in direct contact with the surface of the rolling guide rail 63, and the middle is filled with an oil film I. The damping slider 62 can form a gap of 0.03 mm with the adjacent parts on all guide surfaces, so the roller element 64 can only deflect to this value, and this deflection value is within the elastic deformation range of the rolling element 64 Inside. Since the installation of the roller linear guide has high requirements on the straightness and parallelism of the installation surface, when the rolling guide 63 is installed, the screw 65 is in a loose connection state. Observe whether the rolling slider 61 runs smoothly on the rolling guide 63, and use a tight The screw 66 is used to adjust the parallelism between the rolling guide rail 63 and the movement axis, the screws 65 are tightened in turn, and finally the screw 66 is tightened to fix the rolling guide rail 63 in the inner cavity of the housing 45 . The screw 67 fixedly connects the rolling slider 61 with the actuating rod 413, so that when the actuating rod 413 moves linearly and repeatedly, the rolling slider 61 synchronously moves linearly and repeatedly on the rolling guide rail 63. The sliding friction when moving in the body 45 inner hole is just converted into the rolling friction of the guide mechanism 6, making the movement of the mechanism more flexible.

Another motion mode of the present invention is that when the actuating rod 413 and the nut 412 bear a certain axial force as the input end, the lead screw 49 is driven to rotate. At this time, the reaction force of the guide mechanism 6 - the frictional force . For the rolling guide rail, the contact form is rolling friction, and the friction coefficient is much smaller than the sliding friction coefficient, so as to realize the high-efficiency movement of the guide mechanism 6 and reduce the resistance of the screw transmission reverse movement.

Please refer to Fig. 6 and Fig. 7, Fig. 6 is a partially enlarged view of the auxiliary support part of the front end cover in Fig. 1, and Fig. 7 is a schematic diagram of the external structure of the auxiliary support part of the front end cover in Fig. 1 . The actuating rod 413 is prone to generate radial component force after bearing the axial force from the rudder surface, and the movement stroke of the actuating rod is relatively long. At this time, the auxiliary radial support is very important, which can effectively reduce the bearing capacity of the actuating rod. the bending moment. Due to the complex working conditions on the rudder surface, it is easy to produce irregular motion and vibration of different frequencies, resulting in noise phenomenon. Therefore, the auxiliary support part of the front cover needs to adopt certain vibration reduction measures.

The auxiliary supporting part 5 of the front end cover includes: a front end cover 51 , a screw 52 , a sliding bearing 53 , a Slaid ring 54 , a screw 55 and a tapered pin 56 . The front end cover 51 is installed in cooperation with the opening of the front end of the housing 45, and the sliding bearing 53 is installed in cooperation with the opening of the front end of the front end cover 51. The sliding bearing 53 of the front end cover 51 is fixedly coupled together by screws 52. At the same time, the inner surface of the sliding bearing 53 has a groove matching the width of the Sly ring 54. The Sly ring 54 is circular and has the characteristics of high bearing capacity, good friction characteristics, and strong ability to absorb and attenuate mechanical vibrations. Install in the corresponding groove of sliding bearing 53, and apply proper amount of grease. The auxiliary supporting part 5 of the front end cover and the linear displacement conversion device 4 are fixed by screws 55 and positioned by two symmetrical conical pins 56 .

Please refer to FIG. 8 and FIG. 9 . FIG. 8 is a schematic cross-sectional structure diagram of the position feedback unit in FIG. 1 . FIG. 9 is a schematic diagram of the end face structure of the position feedback unit in FIG. 1 .

The position feedback unit 2 includes: two encoders 21 , two encoder shafts 22 , angular contact ball bearings 23 , an encoder seat 24 , an encoder cover 25 , screws 26 , a large gear 27 and screws 28 .

Two angular contact ball bearings 23 are installed face-to-face on the encoder shaft 22, and then installed in the encoder seat 24 on the end cover of the motor 3; at the same time, the large gear 27 is fixed on the motor rotor by screws 28, and the large gear is adjusted. 27 is identical with the meshing clearance of hobbing on both sides encoder shaft 22, and runs smoothly. The encoder base 24 is fixed on the end cover of the motor 3 by screws 28 . Install the two encoders 21 on the symmetrically arranged encoder base 24 at the same time, fix them with screws 26, use the manual part 1 to rotate the motor rotor, and adjust the screws 26 for installing the encoders, so that the encoders 21 are installed stably without positioning. The encoder cover 25 protects the position feedback unit 2 and is fixed with screws 26 . When the rotor of the motor 3 rotates, the large gear 27 rotates synchronously with it, driving the hobbing gears on the two encoder shafts 22 to rotate, thereby realizing that the two encoder shafts 22 drive the encoder 21 to rotate in the same direction and at the same speed. When one encoder 21 fails, it can switch to another encoder 21 to work immediately, realizing the dual redundancy design of system position feedback and improving reliability.

Please refer to Fig. 3 and Fig. 1, Fig. 3 is a schematic diagram of the appearance of the electric steering mechanism provided by the present invention, and Fig. 1 is a schematic cross-sectional structure A of the electric steering mechanism provided by the present invention.

There is a special maintenance window H on the outside of the electric steering gear, which is convenient for maintenance and operation. The maintenance window H includes a gasket 46 , a cover plate 47 , and screws 48 . A gasket 46 is provided between the cover plate 47 and the housing 45 , and is fixedly connected to the housing 45 through screws 48 .

Claims (10)

1. an electric rudder steering mechanism, it is characterized in that, comprise motor (3), straight-line displacement transfer device (4) and position feedback unit (2), described position feedback unit (2) comprises two position transdusers be connected with rotor transmission; Motor (3) directly connects with straight-line displacement transfer device (4) without retarder, drives straight-line displacement transfer device (4) motion.

2. electric rudder steering mechanism according to claim 1, is characterized in that, described position transduser is coder (21).

3. electric rudder steering mechanism according to claim 2, it is characterized in that, the coder axle (22) of described two coders (21) is equipped with gear hobbing, the rotor of motor (3) is fixed with big gear wheel (27), with the gear hobbing engaged transmission on two coder axles (22) while of big gear wheel (27).

4. electric rudder steering mechanism according to claim 1, it is characterized in that, described motor (3) rear end is provided with the interface matched with manual components, and manual components can insert motor, thus manual drives rotor, manual components is crank (1), handle or handwheel.

5. electric rudder steering mechanism according to claim 1 and 2, is characterized in that, described straight-line displacement transfer device (4) is helicoidal gear.

6. electric rudder steering mechanism according to claim 5, is characterized in that, described helicoidal gear is feed screw nut, roller screw or planetary roller screw.

7. the electric rudder steering mechanism according to any one of claim 1 ~ 6, is characterized in that, electric rudder steering mechanism also comprises guiding mechanism (6); Preferably,

Described guiding mechanism (6) is roller line slideway, comprise rolling slide block (61), non-friction guide (63), roller elements (64), rolling slide block (61) is arranged on non-friction guide (63), and several roller elements (64) are positioned between rolling slide block (61) and non-friction guide (63) contact surface; More preferably,

Roller line slideway also comprises vibration damping slide block (62).Vibration damping slide block (62) comprises a steel structure main body, be drilled with oilhole (J), described vibration damping slide block (62) and rolling slide block (61) are installed on non-friction guide (63) side by side, vibration damping slide block (62) does not directly contact with non-friction guide (63), gap is left in centre, gap location is full of lubricating oil, due to gap little thus formed oil film (I); More more preferably,

I all spigot surfaces of () vibration damping slide block (62) and the gap of adjacent elements are all 0.03mm; Or

(ii) vibration damping slide block (62) inside face is sprayed with sliding bearing material.

8. the electric rudder steering mechanism according to any one of claim 1 ~ 6, it is characterized in that, described straight-line displacement transfer device comprises three place's radial support, first radial support is main radial support (E), it is the angular contact bearing (44) of a pair dos-à-dos installation, second radial support is auxiliary radial support (F), for operating bar (413) there being two of certain axial width support rings (411) match with housing (45) endoporus, the 3rd radial support (G) is front end cover supplemental support parts (5).

9. electric rudder steering mechanism according to claim 8, it is characterized in that, front end cover supplemental support parts (5) also comprise plain bearing (53), this encloses (54), the inside face of described plain bearing (53) is provided with groove, and this encloses (54) and is installed in groove; Preferably,

The endoporus of described plain bearing (53) sprays one deck solid lubricant.

10. the electric rudder steering mechanism according to any one of claim 1 ~ 9, is characterized in that, the outside of described electric rudder steering mechanism is provided with maintenance window (H).