CN110834709A - 360-degree full-rotation inboard and outboard double-motor contra-rotating propeller propelling device overall structure type - Google Patents

Abstract

The 360-degree full-rotation inboard and outboard double-motor contra-rotating propeller propulsion device has a whole structure type, and has two types of main machines, namely a diesel engine and a motor (which are transversely and vertically arranged), and adopts high-speed contra-rotating propellers and a water lubrication technology. The energy is saved by about 15 percent, the total efficiency is 10 percent higher than the low speed, the navigational speed propulsion efficiency is 10 to 12 percent higher than that of a single propeller, and the water lubricating polymer bearing, the stainless steel special bearing and the special sealing piece which are never worn by the bearing are environment-friendly and have zero pollution. The oil motor or the servo motor is used for reducing the speed, the big and small cylindrical gears and the big and small spiral bevel gears realize 360-degree full rotation, the handle is matched with the big and small cylindrical gears, and the spiral bevel gears realize +/-30-degree rotation. The backing speed is 1.6-1.8 times faster, and the navigation is safe. The half type square box with the additional radiating fins is connected with the conical support and the ship body, or the cylindrical box is connected with the rectangular rack and the ship body, the lower box is streamline, the middle wing rudder pressurizes the water plate, energy is saved, and impact force is absorbed. Driver, PLC single cable lead to driver's cabin touch instrument video screen, the double-computer is synchronous and not 25 kinds of forms electronics whole journey controls. A ternary lithium battery or lithium iron phosphate battery module and an intelligent control panel.

Description

360-degree full-rotation inboard and outboard double-motor contra-rotating propeller propelling device overall structure type

Technical Field

The invention relates to the whole structure of a power propulsion device of a motor boat or a light boat, in particular to the whole structure of the ship propulsion device which has the optimal propulsion and control effects of synchronization and asynchronism of 360-degree full rotation and non-360-degree full rotation double motors and adopts a large amount of energy-saving world advanced high-speed paddle-rotating water lubrication technology of the double motors inside and outside a board.

1. The contra-rotating propeller is composed of two propellers which are coaxially connected in series with each other in parallel at the same side with the same horsepower (or different horsepower), the number of the two blades is different, and the rotating directions are opposite.

In the single propeller propulsion system, vortex loss energy in wake flow cannot be utilized, and in the contra-rotating propeller propulsion system, the loss energy of the front propeller is absorbed by the rear propeller and converted into effective propulsion, so that the thrust is greatly higher than that of the single propeller.

The invention utilizes the high-speed contra-rotating propeller map to improve the energy-saving value to about 15 percent and the total efficiency of the high-speed contra-rotating propeller to about 10 percent compared with the low-speed contra-rotating propeller on the basis of the 10-year low-speed contra-rotating propeller comparison test and navigation practice. The speed and the propulsion efficiency are improved by 10-12% compared with the single paddle. The vacuole is improved obviously.

Because the power is shared by two propellers, the diameter of the propeller is reduced by 12-16% compared with that of a single propeller, and the propeller is suitable for shallow water channel navigation.

2. The lower box body adopts a water lubrication technology, a cylindrical tube-shaped special modified polymer bearing is used, the weight is light (the specific gravity is 1.2), the structure is simple and compact, the external dimension of the lower box body is small, the mechanical loss is small, the total steering torque and the total power of the paddle-rudder revolving body are minimum, and the energy-saving value is 1 to 5 percent higher than that of the similar oil lubrication technology at home and abroad.

More importantly, the method is environment-friendly, effectively protects the ecological environment of the water area and has no pollution.

In order to prolong the service life of the polymer bearing, a stainless steel special needle bearing is adopted, namely, a spline water tank is added on the inner diameter of the stainless steel special needle bearing in a thickening way. In addition, an inner ring double lip is arranged between the inner shaft and the outer shaft, and an outer ring multi-tooth-shaped lip is tightly matched with the outer ring multi-tooth-shaped lip to form a sealing element made of special framework materials.

3. The 360-degree full-rotation driving mechanism has various types and paddle rudder rotating bodies:

(1) when the propeller rudder rotator has extra large power, two oil motors (or four servo motor speed reducers) are adopted to respectively drive the small cylindrical gear and then drive the large cylindrical gear to realize 360-degree full rotation of the propeller rudder rotator.

(2) When the propeller rudder rotator is high in power, two servo motor speed reducers are adopted to respectively drive two small cylindrical gears (one of which is standby) and then drive a large cylindrical gear to realize 360-degree full rotation of the propeller rudder rotator.

(3) A motor worm gear reduction box is adopted at medium power and below to drive a pair of spiral bevel gears arranged in the lower cavity of the cylindrical upper box body to realize 360-degree full rotation of the propeller-rudder rotary body.

(4) When the power is low, a manual control handle is adopted to drive a pair of large and small cylindrical gears and a pair of spiral bevel gears arranged in the lower cavity of the cylindrical upper box body to realize the +/-30-degree rotation of the propeller-rudder revolving body.

The ship can rotate in situ, the turning is flexible, the reversing is realized by rotating the paddle rudder revolving body by 180 degrees in a plane in a forward driving mode, the reversing speed is 1.6 to 1.8 times faster than that of the traditional method, and the navigation is safe. The paddle rudder revolving body comprises a lower box body with a streamline structure and a revolving sleeve on the upper portion, the front portion of the lower box body is oval, a middle-section wing-shaped rudder and a water distribution pressure plate are required to ensure that the course is stable and the minimum rudder area is ensured, the steering torque is minimum, the revolving power is minimum, the edge is neat and clean, the appearance is attractive, the resistance is small, passive steering is avoided being caused by the influence of the limit torque of the contra-rotating paddle, general impact is ensured not to be damaged, and the paddle rudder revolving body.

4. The upper box body has two forms:

(1) when the diesel engine and the motor are transversely arranged, the upper box body with high power (including extra-high power) is of a square huff structure with additional radiating fins (radiating and improving strength), the fixed support is connected with the ship body in a conical shape, the original propelling force and vibration borne by the support are borne by the ship body instead, and the propelling device is effectively protected.

(2) When the motor is vertically arranged, the simple cylindrical upper box body is adopted at medium power and below, the structure is simple, compact and novel, the weight is light, the novel rack fixing pin is particularly convenient to disassemble and assemble, and the clamping device is used for conveniently fixing the whole machine at the stern part of the ship.

5. Controlling the starting and stopping of the ship:

(1) when the diesel engine is transversely arranged as a main machine, the ship with high power (including extra-high power) is controlled by the clutch, the extra-high power can use a slip function clutch or a pneumatic tire clutch, a reversing gear and a reversing clutch are omitted, a reversing valve core and a reversing channel are omitted by a control valve of the clutch, and working oil of the clutch and lubricating oil in a box body are supplied by an oil pump driven by a gear shaft in the box and a pair of gears, so that the diesel engine is safe, reliable and energy-saving.

(2) When the motor is transversely arranged as a main machine, a hydraulic clutch and a control valve are omitted, and the motor coupling only transmits power to the middle transmission shaft through a pair of spiral bevel gears in the upper box body, so that the structure is simple, the environment is protected, and zero pollution is realized. It is suitable for medium and large power.

(3) When the motor is vertically arranged as a host, the motor is connected with the coupler, and the intermediate transmission shaft is directly connected with the lower box gear, so that the structure is simplest, the weight is lightest, the environment is protected, the pollution is zero, and the motor is suitable for medium and lower power.

6. The 360-degree full-rotation double-machine synchronization and asynchronous electronic full-range control 25 types (see an operation schematic diagram in detail) not only are mechanical breakthroughs, but also are important breakthroughs in electronic coding programming, when 2 or more than 2 propelling devices are adopted, the operation mode that the ship is most convenient, safe, reliable and quick to turn, leaves from a wharf and backs up is achieved, and the electromechanical integration technology is adopted to enable the project to reach the most advanced level and also be an important breakthrough in safe navigation of the ship.

When the motor is vertically arranged, the battery is a high-efficiency ternary lithium battery or a lithium iron phosphate battery module or a solar panel; the intelligent control panel is internally provided with a GPS chip display screen for calculating speed and mileage, and the power supply can use hydrogen energy or cadmium telluride power generation glass if the technology allows.

Background

In the traditional propulsion device, an engine in a cabin is connected with a gear box with forward and reverse functions and a speed change function, and a single propeller is driven by a stern shaft and stern tube system with the length of about 1.5-3 m or even longer, so that the energy-saving effect is avoided. And the weight is big, with high costs, gear box noise, vibration are big, and the gear box shell shape is irregular, and the incasement multiaxis multiple gear, bearing load are big, and gear transmission power loss is big, and it is difficult to realize especially to changeing oar working method and technical requirement.

The invention patent '360 degree full-rotation ship contra-rotating propeller propulsion device' (patent application number: 200910045713.9) applied before the invention is only suitable for medium and small power low-speed cargo ships, passenger ships, cruise ships, engineering ships, coastal fishing ships and the like. For high-speed ships and boats with the speed of 15-20 knots, the utility boat is not suitable, and is not suitable for high-power and extra-high-power ships. The technical scheme of water lubrication for protecting the water area environment from pollution is not mentioned, besides the larger overall dimension of the fixed support and the incompact structure, the lower box body and the paddle steering revolving body have poor design line type, large resistance, larger steering torque and unsafe navigation, and a safer energy-saving scheme and a safer control mode are not provided for a diesel engine hydraulic system. No 360 ° synchronous and asynchronous maneuvering scheme and specific method has been proposed for installing propulsion units above 2 units.

When the motor is vertically arranged as a main machine, the motor of the invention patent '360-degree full-rotation inboard and outboard double-machine contra-rotating propeller propelling device' (patent number: ZL201210003398.5) approved before the invention is vertically arranged, but has unreasonable structure and high cost. When the power is high, the motor is large and heavy, the fixed support can be larger and heavier, and is unsafe to arrange at the stern, and when the power is lower than the medium power, the fixed support is heavy, high in cost and inconvenient to disassemble and assemble, a 360-degree full-rotation and manual steering +/-30-degree rotation scheme which is suitable for yachts and is simple and reasonable in structure and arranged at the stern is not provided, and a water lubrication scheme for protecting the water area environment from zero pollution is not provided.

The invention patent '360-degree full-rotation inboard and outboard contra-rotating propeller propulsion device complete machine structure' (patent application number: 201510295687.0) applied in 2015 of the invention does not particularly explain two important innovative new technologies of high-speed contra-rotating propellers and water lubrication, the improvement of the energy-saving value and efficiency of the high-speed contra-rotating propellers is not clear, for example, the energy-saving value is 10-15%, the basis for reaching the indexes is not proved from the theory and practice, the accurate energy-saving value under various rotating speeds is proved from the theory and practice of the hydrodynamic ternary wing lift force, resistance and speed field, and the invention is suitable for the structural important improvement and innovation of the high-speed contra-rotating propellers. The structure diagram of the water lubrication is not clear, and particularly, the structure of three water lubrication innovative components is not expressed. The 360-degree full-rotation driving mechanism only refers to a scheme, and does not relate to different structures and innovative characteristics under various powers. More importantly, the vertical arrangement of the motor is not mentioned, the scheme of the light upper box body and the frame which are simplest and light, the innovative components which can be assembled and disassembled quickly and conveniently are not provided, and the scheme of the innovative motor, the controller, the control panel, the battery, the power generation panel … … and the like is not mentioned. Nevertheless, the above-mentioned patents are still pioneered at home and abroad for the lubrication of the propeller water, so the above-mentioned patent application No.: 201510295687.0 the comprehensive technology of consulting and searching new science and technology achievements in Chinese academy of sciences and Shanghai city in 2019, 10 and 25 months and reaches the advanced level of China and the advanced level of China (with consulting and searching new reports).

Disclosure of Invention

Compared with the prior art, the invention has the following innovations:

1. the high-speed contra-rotating propellers with the speed of more than 20km/h are designed, the energy-saving value is about 15%, and the total efficiency is improved by about 10% compared with the low-speed contra-rotating propellers. Theories and practices prove that the energy is saved for the contra-rotating propellers, the sailing speed and the propelling efficiency are improved, but the specific energy-saving value is also related to a plurality of factors such as the rotating speed of the contra-rotating propellers, the blade profile, the disk surface ratio, the blade pitch ratio, the diameter ratio of the two blades and … …, wherein the most important factor is the blade pitch ratio, the blade pitch ratio is too large or too small according to the practical sailing and hydromechanics ternary wing lift force, the induced resistance and the speed theory, the rear blade absorbs the energy loss of the front blade and is not the optimal value, and the part of the water flow from the front blade to the rear blade with the overlarge ratio flows out from the space between the two blades and cannot flow out from the space between the blades of the rear blade; on the contrary, if the ratio is too small, the backward water flow of the front paddle cannot completely enter between the rear paddle blades, and part of the backward water flow directly rushes towards the rear paddle blades and the rear part of the backward water flow counteracts the thrust loss of the front paddle absorbed by the rear paddle.

The ratio is mainly empirical data summarized in the navigation practice of a plurality of ships for more than 10 years except for a high-speed contra-rotating propeller theoretical design map, and then the ratio is raised to the theory, and the optimal propeller pitch ratio is the fundamental reason that the energy saving value of the invention is much higher by about 15% than that of similar products at home and abroad in nearly thirty years. The efficiency of the rotary propeller and the energy conservation are completely enough to compensate the initial price of an engine, a shafting and the propeller, and the rotary propeller has obvious advantages of vigorous popularization and application.

The reversing is carried out by adopting a 360-degree full-revolving mechanism and rotating the paddle rudder revolving body by 180 degrees in a forward driving mode, the reversing speed is 1.6-1.8 times faster than that of the traditional reversing speed, and the sailing is particularly safe. In addition, the high-speed contra-rotating paddle shell is designed into a double-layer structure, and the elastic body is filled, so that the buffering effect is realized when the external force is collided, and the shafting is protected.

2. Water lubricating technology for protecting water area environment

(1) The self-lubricating wear-resistant polymer oil-impregnated bearing which is specially modified by adopting a simple cylindrical tube and is fixed by a cold curing mode is light in weight, has the advantages of compatibility and smoothness in specific gravity of 1.2 (invention patent number: 2011100769551), low hardness, elasticity, automatic positioning, vibration and noise absorption, smooth inner ring, concentricity in all directions, capability of embedding particle foreign matters in water into a shaft sleeve and avoiding scratching the shaft, is approved by various domestic and foreign classification societies, reaches the international advanced level, and is loaded on ships nearly ten thousand in a decade. After adopting water lubrication, the lower box fixed bearing is reduced, the sealing element is less, the total length of the lower box is long, the mechanical loss and the steering torque and power are reduced, so the energy-saving value is 1-5% higher than that of the similar oil lubrication technology at home and abroad.

(2) The stainless steel special bearing is adopted, so that the polymer bearing is never worn, and the infinite service life is achieved. The inner ring of a closed stainless steel needle roller bearing is thickened with a spline water tank, the function of the water tank is to bear the working condition of 2 times of the rotating speed of a propeller, the water tank is required to ensure that lubricating water passes through the water tank and prevent seawater corrosion and impurities in the water from entering the water tank, and the water tank is required to support an inner shaft and an outer shaft so as to keep a constant gap between a polymer bearing and a counter-rotating propeller shaft. The joint of the lubricating water pipe is connected with a water pump, and the other joint is connected with compressed air.

(3) The special sealing element is suitable for running of the contra-rotating propeller, the outer ring of the special sealing element is in a multi-tooth lip shape and rotates together with the outer ring rotating body in an interference fit mode, the inner ring of the special sealing element is in a double-lip shape, the framework material is high in strength and elastic, the sealing element is mainly made of fluorine rubber, wear-resisting coefficient components are added, wear resistance and friction reduction are achieved, the special sealing element can run for more than 5 years under the conditions of the rotating speed of 5000r/min, the temperature of below 250 ℃ and the pressure of 5Mpa, and the special sealing element is safe, reliable. Most of O-shaped rings of the rubber are made of fluorine rubber, but hydrogenated butyl cyanide HNBR is used in a high-power low-temperature environment.

(4) Thrust bearings are respectively arranged on two sides of the inner shaft and the outer shaft of the large spiral bevel gear on the outer shaft of the lower box.

3. The invention relates to a 360-degree full-rotation inboard and outboard double-machine contra-rotating propeller propulsion device, which has a whole structure type comprising a propeller rudder revolving body fixed at the stern part of a ship and a first transmission chain for driving a middle transmission shaft of the propeller rudder revolving body; a second transmission chain for driving a rotation part in the paddle rudder rotation body, a 360-degree full rotation double-motor synchronous and asynchronous operation electronic control driving mechanism and a high-elasticity coupling connected with a prime motor. Also comprises a simple +/-30-degree rotary operator.

(1) A first transmission chain:

the engine is directly connected with the rotating shaft in the upper box body through a high-elasticity coupling, and comprises an upper and a lower shell which are fixed on a stern deck and are provided with additional cooling fins (with the function of reinforcing ribs) to form a half-type square upper box body: the upper box body comprises a rotating shaft which is rotatably arranged between the upper box body and the lower box body, the axis of the rotating shaft is vertical to the middle transmission shaft, one end of the rotating shaft extends out of the upper box body, and a small spiral bevel gear which is fixed on the rotating shaft of the upper box body and is meshed with the large spiral bevel gear fixed at the upper end of the middle transmission shaft.

(A) When the diesel engine is a main engine and is transversely arranged, whether the diesel engine is meshed or not is controlled by a clutch in an upper box body, a hydraulic control valve can be used for a control valve of a hydraulic clutch or an electromagnetic clutch (when the extra power is extra large, a slip function clutch or a pneumatic tire clutch is used for connecting the diesel engine outside the upper box body), an electro-hydraulic electromagnetic reversing valve or an electronic gear shifting hydraulic control valve is used, the control valve needs to be specially designed without a reversing valve core and a passage, hydraulic oil of the clutch is supplied to a cooler control valve pipeline by two energy-saving variable-frequency motor oil pump units (one of which is standby), and oil can be supplied to an oil pump system by a pair of shaft gears in the upper box body.

(B) When the motor is used as a main machine and is transversely arranged, the motor adopts an alternating-current permanent magnet asynchronous motor, the force energy index is high, the noise vibration is small, the reliability is high, the maintenance is convenient, the large and small spiral bevel gears in the upper box body and the inside are the same as those of a diesel engine, and the difference is that a hydraulic or electromagnetic clutch, a corresponding control valve, a corresponding loop and two energy-saving variable frequency motor oil pump sets are omitted, and the spiral bevel gear shaft in the upper box body is changed into a pair of cylindrical gears to drive an oil pump to be only used as lubricating oil of a gear box.

(C) When the motor is vertically arranged, the upper box body and the large and small spiral bevel gears and the shaft with a pair of cylindrical gears and the like in the transverse arrangement are completely omitted. The motor is directly connected with a high-elasticity coupling, an intermediate transmission shaft, a simple cylindrical upper box body which is provided with a bearing and an oil seal in a penetrating way, and a fixed sleeve is connected with a lower box body. The stator of the motor is a new developed product (patent certificate, patent number: ZL201510312428.1) and is a water-cooling three-phase permanent magnet synchronous motor, an aluminum alloy shell is provided, the weight is light, the appearance is small, the noise is low, and the power density is higher by adopting a hairpin type flat wire process.

The first rectangular frame is fixed with the rectangular frame at the lower end of the upper box body, the lower part of the upper box body is connected with the fixed sleeve, the fixed sleeve is sealed through a lower gland, and the rectangular frame is connected with the hull frame through a clamping device. A rotary sleeve rotatably mounted in the lower space of the cylindrical upper box body and having a lower end passing through the fixed sleeve, and a streamlined lower box body fixed to the lower end of the rotary sleeve. Adopt the frame fixed pin that innovative design can be dismantled fast.

The first transmission chain further comprises an intermediate transmission shaft (comprising a middle-section elastic coupling), the upper end and the lower end of the intermediate transmission shaft are respectively and rotatably arranged in the upper box body and the lower box body, the middle section of the intermediate transmission shaft is positioned in the rotating sleeve, the intermediate transmission shaft is rotatably arranged in the lower box body, the axis of the intermediate transmission shaft is perpendicular to the intermediate transmission shaft, one end of the intermediate transmission shaft extends out of the lower box body, a first high-speed propeller arranged at the extending end of the first propeller shaft, a second propeller shaft rotatably arranged in the lower box body, the axis of the second propeller shaft is superposed with the first propeller shaft, a second high-speed propeller arranged at the extending end of the second propeller shaft, two large spiral bevel gears respectively arranged at the two ends of the first propeller shaft and the second propeller shaft, and a small spiral bevel gear fixed at the lower end of the intermediate transmission shaft and respectively meshed with the.

(2) A second transmission chain:

(A) extra large power: the 360-degree full-rotation driving mechanism comprises two oil motors or four servo motor speed reducers (two of which are standby) which are arranged and fixed on a circular plate base of a shell at the lower part of an upper box body, a small cylindrical gear which is connected below an angle sensor, a small cylindrical gear which is fixed on an output shaft of the oil motor (or the speed reducer), a large cylindrical gear which is driven by the small cylindrical gear and fixed below the circular plate base, a conical support which is fixed with the circular plate base and the lower part of which is connected with a fixed sleeve, the conical support is connected with a hull frame, a rotating sleeve which is rotatably arranged in the conical support, the upper end of the rotating sleeve extends into a cavity at the lower end of the upper box body, the lower end of the rotating sleeve penetrates through the fixed sleeve, and a streamline lower box body which is fixed at the lower end of the rotating sleeve, the front section of the rotating sleeve is lengthened into.

(B) High power: two servo motor reducers with encoders are used to drive two small cylindrical gears (one for use) and another small cylindrical gear meshed with the big cylindrical gear drives an angle sensor. The small cylindrical gear drives a large cylindrical gear fixed below the circular plate base; or three planetary gear reduction units can be arranged on the circular plate base to respectively drive three small cylindrical gears and then drive a large cylindrical gear fixed below the circular plate base. The structure of the lower part of the paddle rudder rotary body is the same as that of the lower part (A).

(C) Medium and following power: the speed reducer comprises a motor worm gear box speed reducer unit which is fixedly arranged on a rectangular rack at the back of a cylindrical upper box body, and a small spiral bevel gear in a cavity at the lower part of the cylindrical upper box body is driven by a coupler and an upper connecting pipe at the back end of the upper box body to drive a large spiral bevel gear fixed at the upper end of a rotary sleeve. The structure of the lower part of the paddle rudder rotary body is the same as that of the lower part (A).

The motor is a new product developed, is totally closed and cooled by a fan, is made of high-strength aluminum alloy with a shell, is unique and parallel to a vertical radiating surface, and has a good radiating effect.

(D) Low power: the +/-30-degree slewing mechanism comprises a main motor controller which is fixedly arranged on a rectangular rack at the back of a cylindrical upper box body, a small cylindrical gear which is fixed on a control handle shaft between the rack and the upper part of the upper box body drives a large cylindrical gear to drive a small spiral bevel gear in a cavity at the lower part of the cylindrical upper box body through an upper connecting pipe to drive a large spiral bevel gear fixed at the upper end of a rotating sleeve, and the structure of the lower part of a paddle-rudder slewing body is the same as that of (A).

For the propulsion unit with medium or lower power, in order to raise precision, more stable operation and reduce noise, the involute splines are used for contra-rotating propeller splines. The handle is operated to rotate within +/-30 degrees, and a plurality of functional buttons and switches are arranged on the handle.

4. The 360-degree full-rotation (double-machine) synchronous and asynchronous operation electronic control driving mechanism comprises a driver connected with an energy-saving variable frequency motor and a servo motor encoder, a PLC, a main charging and discharging box, the PLC is communicated with a cab touch instrument video screen and a double-machine double-propeller manipulator through a single cable, a steering wheel is steered through 360 degrees besides an oil pump energy-saving variable frequency motor and an electronic control diesel engine accelerator and a clutch, and a 360-degree azimuth indicator achieves double-machine 360-degree synchronization and asynchronous electronic full-course control of forward, backward, turning and turning of a ship in 25 modes. An angle sensor is additionally arranged, and the minimum 360-degree rotation angle error +/-1 degree is displayed on a view screen of the cab touch instrument.

The touch instrument view screen is also provided with an ammeter, a voltmeter, a tachometer, a box body temperature sensor, a lubricating oil pressure sensor, a 360-degree angle sensor and an overload emergency parking device.

Other types of high-efficiency ternary lithium batteries (144V/160A) for the motor vertical arrangement battery system can be used, such as solar panels, or expandable lithium iron phosphate battery modules, the capacity of each module is 48V/50Ah, and a three-speed mode intelligent control panel. The built-in GPS chip display screen calculates speed and mileage, reaches powerful power, and the operation is simple and easy, and is economic reliable, high-efficient power saving, clean environmental protection.

Drawings

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the objects, features and advantages thereof can be clearly understood.

FIG. 1 is a schematic side view of the stern of a main engine ship of a diesel engine of a complete structure type of the inboard-outboard (double-engine) contra-rotating propeller propulsion unit.

FIG. 2 is a schematic top view of the stern of a main engine ship of a diesel engine of the inboard-outboard (single-machine) contra-rotating propeller propulsion unit.

FIG. 3 is a schematic side view of the whole structure of the inboard-outboard (single machine) contra-rotating propeller propulsion device of the present invention.

Fig. 3A is a schematic side view of the whole structure of the inboard-outboard (single machine) contra-rotating propeller propulsion unit-the shaft-gear oil pump for implementation.

FIG. 4 is a left side view of the overall structure of the inboard-outboard (single machine) contra-rotating propeller propulsion unit of the present invention, and the structure shown in FIG. 3.

Fig. 5 is a top view of the whole structure of the inboard-outboard (double-machine) contra-rotating propeller propulsion device of the invention, and 2 propulsion devices are arranged on the structure shown in fig. 1.

FIG. 6 is a schematic side view of the stern of a main engine ship using the motor of the inboard-outboard (dual-engine) contra-rotating propeller propulsion unit of the present invention.

FIG. 7 is a schematic top view of the stern of a main engine ship using the motor of the present invention.

FIG. 8 is a schematic side view of an embodiment of the present invention, which is an electric motor of the overall structure of the inboard-outboard (single machine) contra-rotating propeller propulsion device.

FIG. 9 is a left side view of the overall structure of the outboard and inboard (single machine) contra-rotating propeller propulsion unit of the present invention as the main machine of the structure shown in FIG. 8.

Fig. 10 is a top view of the propulsion device of the present invention, which is a motor of the overall structure of the inboard-outboard (double-machine) contra-rotating propeller propulsion device, and 2 propulsion devices are installed in the structure shown in fig. 6.

FIG. 11 is a schematic side view of the water lubrication structure of the inboard-outboard (dual-machine) contra-rotating propeller propulsion unit.

Fig. 12 shows 25 types of synchronous and asynchronous electronic full-range control of the overall structure of the inboard-outboard (dual-engine) contra-rotating propeller propulsion unit.

Fig. 13 is a schematic side view of a stern of a ship with a motor of a complete structure of the inboard-outboard (double-machine) contra-rotating propeller propulsion unit as a main machine vertically arranged.

FIG. 14 is a schematic side view of a stern of a + -30 DEG rotary ship with a motor as a main machine, which is vertically arranged, in a structure of a ship with inboard and outboard (single-machine) contra-rotating propellers of the invention.

FIG. 15 is a schematic side view of an embodiment of the inboard-outboard (single machine) contra-rotating propeller propulsion unit of the present invention with a vertical motor as the main machine.

FIG. 16 is a schematic side view of the inboard-outboard (single machine) contra-rotating propeller propulsion unit of the present invention, in which the motor is vertically arranged as a main machine for + -30 DEG rotation.

FIG. 17 is a schematic side view of a structure of a vertical arrangement of a water lubrication system for a motor of a complete inboard-outboard (dual-engine) contra-rotating propeller propulsion unit of the present invention.

Detailed Description

Referring to fig. 1, when a diesel engine is used as a main engine, the whole structure of the 360-degree full-rotation inboard-outboard double-engine contra-rotating propeller propulsion device comprises: the propeller-rudder revolving body 18 is fixed on the stern part of a ship, the propeller-rudder revolving body 18 is protected and fixed on a half-type square box body which is formed by an upper shell 11 and a lower shell 10 with additional cooling fins on a hull 2 of the stern part of the ship, a circular plate base 10 is used as the upper part of a bracket and is screwed with a lower part of a conical bracket 3, a first transmission chain of a middle transmission shaft 19 in the propeller-rudder revolving body 18 is driven, a second transmission chain of a revolving part in the propeller-rudder revolving body 18 is driven, and a 360-degree full-revolving double-machine synchronous and asynchronous 25 modes run an electronic operation driving mechanism 17 and a high-elasticity coupling 15.

Referring to fig. 1, 3 and 4, when the prime mover is a diesel engine, the upper case includes a rotary shaft 34 rotatably disposed between the upper and lower cases 10 and 11 with its axis perpendicular to the intermediate transmission shaft 19 and one end extending out of the upper case, a bevel pinion 35 fixed to the rotary shaft 34 of the upper case and engaged with a bevel pinion 36 fixed to the upper end of the intermediate transmission shaft 19; the engagement and disengagement of the oil pump are controlled by a clutch 14 in the upper box body, an energy-saving variable frequency motor 7 is respectively arranged on the left side and the right side of a circular plate base of a shell 10 at the lower part of the upper box body, and an oil pump unit of an oil pump 9 is driven by a coupler 8 or an oil pump 9 is driven by shaft gears 7I and 8I and the oil pump 9I (shown in figure 3A) which are fixed at the other end of a rotating shaft 34. During operation, working oil is pumped from the upper box bodies 10 and 11 through a coarse filter (not shown in the figure) to a cooler 12 and a fine filter (with a bypass valve) (not shown in the figure) on the upper part of an upper box cover 46, and the cooled working oil enters the oil cylinder of the clutch 14 through a control valve 13 on the upper box cover 46, and overflows (is low-pressure) to each lubricating part through a working pressure valve in the control valve 13, and most of the working oil returns to an oil sump of the upper box body.

The middle transmission shaft 19 is divided into an upper section and a lower section which are connected by a coupling 49, the upper end of the middle transmission shaft is rotatably arranged in the lower shell 10 of the upper box body, the lower end of the middle transmission shaft is rotatably arranged in the cavity of the lower box body 20, the middle section of the middle transmission shaft is positioned in the rotating sleeve 48, the first propeller shaft 45 is rotatably arranged in the lower box body 20, the axis of the first propeller shaft is vertical to the middle transmission shaft 19, and one end of the first propeller shaft. The first high-speed propeller 21 is mounted on the projecting end of the first propeller shaft 45, and a large bevel gear 44 is mounted on the first propeller shaft 45 at one end of the lower case 20, and the second propeller shaft 42 is rotatably provided in the lower case 20 with its axis coinciding with the first propeller shaft 45 and with one end projecting out of the lower case 20, and a large bevel gear 41 is mounted on the second propeller shaft 42 at one end of the lower case 20, and the second high-speed propeller 22 is mounted on the projecting end of the second propeller shaft 42, and the two large bevel gears 41 and 44 are engaged with a small bevel gear 40 mounted on the lower end of the intermediate transmission shaft 19, respectively.

An elliptical shell body 43 is arranged in front of the lower box body 20, a shaft shell 51 and a fixed shaft 52 of a second propeller shaft 42 are arranged in the shell body 43, a wing type rudder 39 is arranged above the lower box body 20 and is provided with a water pressing plate, and a second transmission chain of a rotating part of the propeller rudder rotating body 18 comprises: two sets of a speed reducer 4, a servo motor 5, an encoder 6 and the like fixed on a circular plate base of a shell 10 at the lower part of the upper box body are also connected with a small cylindrical gear 37 below an additional angle sensor (not shown in the figure), and two small cylindrical gears 37 are respectively arranged on output shafts of the speed reducer 4 and are respectively meshed with a large cylindrical gear 38 arranged below the circular plate base. One of the two units is spare, a small cylindrical gear 37 is also connected below an angle sensor (53) (not shown in the figure) and is fixed at the lower part of the large cylindrical gear 38, the upper part of the angle sensor is conical, a rotating sleeve 48 is arranged at the lower part of the rotating sleeve 48 between a fixed sleeve 47 and the middle transmission shaft 19, and the lower end of the rotating sleeve 48 passes through the fixed sleeve 47 and a fixed sleeve gland 50 to be connected with a wing type rudder 39 at the middle section of the lower box 20.

Referring to fig. 2 and 5, the 360 ° full-rotation dual-machine synchronous and asynchronous 25-operation electronic control driving mechanism 17 comprises a driver 24 connected with two encoders 6 and an energy-saving variable frequency motor 7, a P1C25, a main charging and discharging box 26, a PLC25, a cab touch instrument screen 17 and a dual-machine dual-paddle controller 32 through a single cable 27, or a single machine 32I, wherein the touch instrument screen 17 is provided with an energy-saving variable frequency motor 29 for controlling left and right oil pumps (when the oil pumps are charged by a shaft gear and then the oil pumps 29 are cancelled), a 360 ° steering wheel 30, a 360 ° azimuth indicator 31 and a main accelerator electronic control 28, a clutch electronic control 33 and other instruments, and an overload emergency parking device. The main charging and discharging tank 26 is connected to the driver 24 and the PLC25, and is connected to the ship lighting, the navigation signal, the wireless phone, the emergency generator, and the hybrid battery pack, which are not shown and will not be described.

Referring to fig. 6, when the electric motor is used as the main engine, the overall structure of the 360-degree full-rotation inboard-outboard double-engine contra-rotating propeller propulsion device of the invention comprises the first transmission chain and the second transmission chain, which are the same as those of the diesel engine, and are not repeated here.

Referring to fig. 6 and 8, 9, when the prime mover is an electric motor, the upper case includes a shaft 34 rotatably disposed between the lower cases 10, 11 with an axis perpendicular to the intermediate shaft 19 and one end extending out of the upper case; a small cone spiral bevel gear 35 fixed on the rotating shaft 34 and engaged with a large cone spiral bevel gear 36 fixed on the upper end of the middle transmission shaft 19, an oil pump driving gear 7I is arranged at the other end of the rotating shaft 34, an oil pump driven gear 8I is driven, an oil pump 9I is driven (the oil pump 9I can be arranged in the upper box body or outside the upper box body through a coupling 54), lubricating oil is pressed from oil pools in the upper box bodies 10 and 11 to a cooler 12 on the upper box cover 46 through a coarse filter 55 when the oil pump 9I works, and the cooled lubricating oil (the pressure is below 3 kg/cm) directly returns to the upper box body through a fine filter 56 with a bypass valve.

The additional components of the intermediate drive shaft 19 up to the lower box, including the wing rudder 39 and the water pressing plate, are the same as in the case of the diesel engine as the main engine and are not repeated here.

Referring to fig. 7 and 10, when the motor is used as a main machine, the 360-degree full-rotation double-machine synchronous and asynchronous 25 electronic operation control driving mechanism 17 comprises a PLC25 connected with two encoders 6, a main charge and discharge box 26, the PLC is provided with a 360-degree steering wheel 30 through a cab touch instrument view screen 17 and a double-machine double-paddle manipulator 32 or a single machine 32I touch instrument view screen 17, a 360-degree azimuth indicator 31 and other instruments comprise an ammeter, a voltmeter and a tachometer and are provided with a box body temperature sensor, a lubricating oil pressure sensor and a 360-degree angle sensor, and an overload emergency parking device.

Referring to fig. 11, the overall structure type water lubrication scheme of the inboard and outboard double-engine contra-rotating propeller propulsion unit of the invention is that the inner surface of the outer shaft 45, the inner surface of the left box cover 64 of the lower box and the inner surface of the front propeller sealing shaft cover 61 are all provided with the water lubrication special bearing 58 made of high polymer material, the water lubrication special bearing device 60 for keeping the water lubrication special bearing 58 to reach infinite service life, the water pipe joint 62 is connected with the water pump (not shown in the figure) and the water pipe joint 63 and compressed air, the thrust bearings 57I for keeping the distance between the spiral bevel gears 44 and 41, the thrust bearing 57II for keeping the distance between the spiral bevel gears 44 and 41, the copper bush 52 on the outer surface of the inner shaft 42 keeps a certain gap with the water lubrication special bearing 58, the copper bush on the outer surface of the outer shaft 45 keeps a certain gap with the copper bush 58.

Referring to fig. 12, the inboard-outboard double-machine opposite-rotating-propeller propulsion device has 25 types of synchronous and asynchronous electronic whole-course control in the whole structure type.

The boat reversing of the invention uses a 360-degree azimuth indicator by operating a 360-degree steering wheel 30 in a driving mechanism 17, the 0-degree steering is turned to 180 degrees, namely the turning part of a paddle steering revolving body 18 is turned by 180 degrees, the rotating paddles 21 and 22 are turned to the front of the axis of an intermediate transmission shaft 19 to start the forward running, namely the boat is reversed to run, the running is finished within 15-20 seconds, the boat inspection standard is met, the operation is simple and convenient, and the boat reversing is safer than the traditional boat running by 1.6-1.8 times.

The following figure part symbols are listed separately.

Referring to fig. 13 and 15, when the motor is vertically arranged as a main unit, the motor comprises a paddle rudder revolving body 18 fixed on a stern part, the protective paddle rudder revolving body 18 is fixed on a hull 28 of the stern part and is connected with a rack base plate 7 and a rack 8 through clamping devices 9, 10 and 11, and a cylindrical upper box body 3 is fixed by a gear box fixing plate 2 at the upper part and the rack 8. The motor 1 is arranged on the upper part of the upper box body 3 and is connected with a first transmission chain of a high-elasticity coupling 30 and an intermediate transmission shaft 29 in the upper cavity of the upper box body 3.

The second transmission chain of the rotation part of the driving paddle-rudder rotation body 18 comprises a pair of motors 15 and a worm gear reduction box 16 connected with a coupler 13, and an upper connecting pipe 12 and a small rotating spiral bevel gear 4 in the lower cavity of the upper box body 3 drive a large rotating spiral bevel gear 5 fixed at the upper end of a rotation sleeve in the paddle-rudder rotation body 18 to realize 360-degree full rotation. A rotating sleeve in the paddle rudder rotator 18 penetrates through a fixed sleeve 17, a water pressing plate 19, a wing type rudder 20, a lower box body 21, a lower rudder 22, a first high-speed propeller 24 and a second high-speed propeller 23.

A motor controller (No. 2) 14 of the main motor 1 (a water-cooled three-phase permanent magnet synchronous motor) is arranged above the auxiliary motor 15. The frame backing plate 7 and the frame 8 are connected by a plurality of frame fixing pins 31 which rotate quickly and are convenient to detach.

Referring to fig. 14 and 16, when the motor is vertically arranged: the first drive train is identical to that of figures 13 and 15. The second transmission chain drives the oar and rudder revolving body 18 to rotate +/-30 degrees, and comprises a handle 25 which drives a small cylindrical gear 26 and then drives a large cylindrical gear 27, and an upper connecting pipe 12 and a small rotating spiral bevel gear 4 in the lower cavity of the cylindrical upper box body 3 are connected and then drive a large rotating spiral bevel gear 5 fixed at the upper end of a rotating sleeve in the oar and rudder revolving body 18 to rotate +/-30 degrees. And a manhole cover 6 of the upper box body 3. The paddle rudder rotor 18 is the same as in fig. 13 and 15 in the lower part. The rear of the frame is provided with a motor controller (No. 2) 14 of a main motor 1 (a water-cooled three-phase permanent magnet synchronous motor).

Referring to fig. 17, the scheme of water lubrication is shown when the motor is vertically arranged as a main machine. The inner surface of the outer shaft 32, the inner surface of the right box cover 44 of the lower box and the inner surface of the front paddle sealing shaft cover 45 are all provided with a water lubrication special bearing 34 made of high polymer materials, a water lubrication special needle bearing device 35 for keeping the water lubrication special bearing 34 to achieve infinite service life, a thrust bearing 37 for keeping the distance between spiral bevel gears 39 and 42 and a thrust bearing 38 for keeping the distance between the spiral bevel gears 39 and 44, a copper bush (not shown in the figure) on the outer surface of the inner shaft 40 keeps a certain gap with the water lubrication special bearing 34, a copper bush (not shown in the figure) on the outer surface of the outer shaft 32 keeps a certain gap with the copper bush (not shown in the figure) 34, a sealing element 36 for keeping the lower box 21 separated from the water lubrication space and a rotating paddle.

Claims (3)

1. The whole structure type of the 360-degree full-rotation inboard and outboard double-machine contra-rotating propeller propulsion device is divided into two types, namely a diesel engine and an electric motor (transversely and vertically arranged) as main machines, and structurally comprises a propeller-rudder revolving body at the stern part of a ship, a first transmission chain for driving a middle transmission shaft of the propeller-rudder revolving body, a second transmission chain for driving the revolving part of the propeller-rudder revolving body, a high-elasticity coupler and a simple +/-30-degree revolving operator which are connected with a prime motor and run an electronic control driving mechanism in 25 modes synchronously with full rotation at 360 degrees and asynchronously, and the outstanding innovation points are high-speed contra-rotating propellers and water lubrication technology with zero pollution;

(1) on the basis of high-speed contra-rotating propeller theoretical map and low-speed contra-rotating propeller multi-ship comparison test and sailing practice for more than 10 years, the optimal propeller pitch ratio of high-speed contra-rotating propellers is selected to save energy by about 15 percent, the total efficiency of contra-rotating propellers is improved by about 10 percent compared with that of low-speed contra-rotating propellers, and the sailing speed and the propulsion efficiency are 10 to 12 percent higher than that of single propellers;

because the power is shared by two propellers, the diameter of the propeller is reduced by 12-16% compared with that of a single propeller;

the paddle rudder revolving body is rotated by 180 degrees by adopting a 360-degree full-revolving mechanism to drive the car forward, so that the backing is 1.6-1.8 times faster than the traditional backing, and the sailing is particularly safe;

the high-speed contra-rotating paddle shell is of a double-layer structure, an elastic body is filled in the contra-rotating paddle shell, and the shaft is buffered and protected during impact;

(2) the water lubrication technology is adopted, so that pollution is avoided, and the ecological environment of the water area is effectively protected. The self-lubricating wear-resistant polymer oil-impregnated bearing which is specially modified in the shape of a cylindrical pipe and fixed in a cold-setting mode has light weight (the specific gravity is 1.2), so that the external shape size of a lower box body is small, the structure is simple and compact, the mechanical loss is small, and the total steering torque and power of a paddle-rudder revolving body are minimum, so that the energy-saving value is 1-5% higher than that of the similar oil-lubricated technology at home and abroad;

the stainless steel special bearing is adopted to lead the high molecular bearing to be never worn and achieve infinite service life, and the structure of the bearing is that the inner ring of the stainless steel closed needle bearing is thickened and provided with a key water tank;

the special sealing element is suitable for running of the contra-rotating propeller, the outer ring multi-tooth lip shape rotates together with the outer ring rotating body, the inner ring double lips are high in framework material strength and elastic, and the sealing element mainly adopts fluorine rubber to increase wear-resisting coefficient components;

(3) first transmission chain

The engine is directly connected with a rotating shaft in the upper box body through a high-elasticity coupling and comprises an upper shell and a lower shell which are fixed on a stern deck to form a half-type square upper box body, the upper box body comprises a rotating shaft which is rotatably arranged between the upper shell and the lower shell of the upper box body, the axis of the rotating shaft is vertical to the middle transmission shaft, one end of the rotating shaft extends out of the upper box body, and a small spiral bevel gear which is fixed on the rotating shaft of the upper box body and is meshed with a large spiral bevel gear fixed at the upper;

(A) when the diesel engine is a host and is transversely arranged, the engagement and disengagement of the diesel engine are controlled by a clutch in an upper box body, and a hydraulic control valve, an electro-hydraulic electromagnetic reversing valve and an electronic gear shifting control valve are used for a control valve of a hydraulic clutch or an electromagnetic clutch (a slip function clutch or a pneumatic tire clutch is used in the case of extra-large power); the oil supply of the clutch is supplied by an oil pump unit consisting of two energy-saving variable frequency motors, or can be supplied by an oil pump which is positioned in or outside the upper box body and driven by a pair of shaft gears in the upper box body;

(B) when the motor is transversely arranged as a main machine, the size of the spiral bevel gear in the upper box body is unchanged, a clutch, a control loop and an energy-saving variable frequency motor oil pump unit are omitted, and only a pair of cylindrical gears are arranged on a shaft to drive an oil pump to be used for cooling lubricating oil of a gear box;

(C) when the motor is vertically arranged as a host, the motor is directly connected with a high-elasticity coupler arranged in a cavity at the upper part of the cylindrical upper box body, passes through a rectangular rack at the lower end of the upper box body and a middle transmission shaft in a fixed sleeve and is then connected with a spiral bevel gear of a lower box, the motor is arranged at the upper part of the cylindrical upper box body, and the rectangular rack at the bottom is fixed with a hull plate through a clamping device;

the motor stator and winding mode is a research and development product, is a water-cooling three-phase permanent magnet synchronous motor, has an aluminum alloy shell, light weight, small appearance and low noise, and the rack base plate is connected with the rack fixing pin which is extremely convenient to disassemble in a quick rotating mode;

the upper end and the lower end of the middle transmission shaft (comprising a middle section elastic coupling) are respectively and rotatably arranged in the cavities of the upper box body and the lower box body, the middle transmission shaft (comprising a middle section elastic coupling) with a middle section positioned in the rotating sleeve is rotatably arranged in the lower box body, the axis of the middle transmission shaft is vertical to the middle transmission shaft, one end of the middle transmission shaft extends out of the lower box body, a first high-speed propeller arranged at the extending end of the first propeller shaft, a second propeller shaft which is rotatably arranged in the lower box body and the axis of the middle transmission shaft is superposed with the first propeller shaft, a second high-speed propeller arranged at the extending end of the second propeller shaft, two large spiral bevel gears which are respectively arranged at the two ends of the first propeller shaft and the second propeller shaft positioned in the lower box body, and a small spiral bevel gear which is fixed at the;

(4) second driving chain

(A) Extra large power: two oil motors or four servo motor reducers are arranged and fixed on a circular plate base of a shell at the lower part of an upper box body, respectively drive a small cylindrical gear to drive a large cylindrical gear to be fixed with the circular plate base, and the lower part of the small cylindrical gear is connected with a fixed sleeve which is sealed by a lower gland;

(B) high power: two servo motor reducers with encoders are used to drive two small cylindrical gears, one of which is reserved, and another small cylindrical gear meshed with a large cylindrical gear drives an angle sensor, or three planetary gear reducers are mounted on a circular plate base to drive three cylindrical gears and then drive a large cylindrical gear. The rest structures are the same as (A);

(C) medium and following power: the motor is vertically arranged as a host and comprises a worm gear reduction box of a secondary motor, a coupler, an upper connecting pipe and two small spiral bevel gears which are respectively arranged in the space at the lower part of the cylindrical upper box body, and the large spiral bevel gears which are arranged at the upper part of a rotating sleeve of the rudder rotator are driven by the small spiral bevel gears to realize 360-degree full rotation. The motor controller of the main motor is arranged above the auxiliary motor, and the whole machine is fixed at the stern part of the ship by a clamping device;

(D) low power: the motor is vertically arranged as a main machine and comprises a handle for driving a small cylindrical gear and then driving a large cylindrical gear, an upper connecting pipe and two small spiral bevel gears which are respectively arranged in the lower space of a cylindrical upper box body drive the large spiral bevel gear arranged on the upper part of a rotary sleeve of a propeller-rudder rotary body to realize +/-30-degree rotation, a main motor controller is arranged behind a rectangular frame, and the whole machine is fixed at the stern part of a ship by a clamping device; the handle is operated to rotate at +/-30 degrees, and a plurality of functional buttons and switches are arranged on the handle;

(5) the 360-degree full-rotation double-motor synchronous and asynchronous 25-operation electronic control driving mechanism comprises a driver connected with an energy-saving variable frequency motor and a servo motor encoder, a PLC main charge and discharge box is communicated with a cab touch instrument view screen and a double-motor double-propeller controller through a single cable, a steering wheel is steered through 360 degrees besides an oil pump variable frequency motor and an electronic control diesel engine accelerator clutch, a 360-degree direction indicator achieves 360-degree synchronous and asynchronous 25-form electronic whole-course control, the touch instrument view screen is also provided with an ammeter, a voltmeter and a tachometer, and is also provided with three sensors of a box body temperature, a lubricating oil pressure and a 360-degree angle, and overload emergency parking is realized;

(6) when the motors are vertically arranged, the water-cooled three-phase permanent magnet synchronous motor adopts a hairpin type flat wire process, the power density is higher, and the aluminum alloy shell is small in size, light in weight and low in noise. The battery system is a high-efficiency ternary lithium battery (144V/160A) or an expandable lithium iron phosphate battery module, the capacity of a single module is 48V/50AH, other modules such as a solar panel and a three-speed mode intelligent control panel can be used, a GPS chip is arranged in the battery system to calculate the speed and the mileage, powerful power is achieved, and the battery system is easy to operate, economical, reliable, high-efficiency, power-saving, clean and environment-friendly.

2. The overall structure of the 360 ° full-swing inboard-outboard double-machine contra-rotating propeller propulsion unit as claimed in claim 1, wherein the first transmission chain is composed of a small spiral bevel gear fixed on the rotating shaft in the upper box body and engaged with a large spiral bevel gear fixed on the upper end of the middle transmission shaft, a first and a second spiral bevel gears respectively installed on the first and the second spiral shafts at the two ends of the lower box body, and a small spiral bevel gear fixed on the lower end of the middle transmission shaft and engaged with the two large spiral bevel gears respectively.

3. The 360 ° full-rotation inboard and outboard double-engine contra-rotating propeller propulsion unit as claimed in claim 1 or 2, wherein when the diesel engine is the main engine, the clutch designed in the upper box controls the engagement and disengagement of the gear of the upper box, when the electric motor is the main engine, the loop with the clutch and the control valve omitted is arranged transversely, and when the electric motor is the main engine, the clutch is omitted completely.

Images