Adaptive radial load main thrust bearing and large ship propeller shaft system

Abstract

This invention discloses an adaptive radial load main thrust bearing and a large ship propeller shaft system, including a housing, a thrust assembly, two radial support devices, a hydraulic system, a sensor module, and a control system; the two radial support devices are located on both sides of the thrust shaft of the main shaft; the radial support devices include an upper cavity and a lower cavity, an upper piston and a lower piston, and a bearing structure; the bearing structure and the piston constitute a floating structure, which floats up and down within the upper and lower cavities; a hydraulic cavity is formed between the piston and the cavity, and the floating position of the floating structure is controlled by adjusting the pressure difference between the upper and lower hydraulic cavities; a sensor module is provided between the cavity and the housing, and the hydraulic system is connected to the hydraulic cavity; the control system adjusts the pressure difference between the upper and lower hydraulic cavities based on the monitoring data of the sensor module, thereby realizing a compact and fast-responding radial support height adjustment function, significantly improving the intelligence level and load adaptability of the main thrust bearing system.

Description

Technical Field

[0001] This invention relates to the field of large ship propeller shaft system technology, specifically to a main thrust bearing with adaptive radial load and a large ship propeller shaft system. Background Technology

[0002] The main thrust bearing is a key component in the propulsion system of large surface ships, bearing axial and radial forces. Its typical structure includes a thrust disc and two sliding radial support bearings. While the currently widely used double-pivot sliding thrust bearing has a mature structure, it suffers from the following problems in actual operation:

[0003] 1) Uneven radial load distribution: Due to changes in ship operating conditions, manufacturing errors, or shaft deformation, the two radial bearings are subjected to uneven forces, which can easily lead to local wear, vibration, and reduced bearing life.

[0004] 2) Contact friction problem: Sliding bearings rely on fluid lubrication, and friction and wear are aggravated during startup, shutdown or extreme operating conditions.

[0005] 3) Lack of real-time adjustment capability: Traditional shaft systems do not have adjustment functions and cannot dynamically respond to load changes.

[0006] Some designs have attempted to incorporate electronic control for adjustment, but these are structurally complex, costly, and difficult to promote. Other structures use floating components to achieve "centering," but lack dynamic adjustment capabilities and struggle to cope with complex load variations. To address these issues, a simple, fast-responding, and precisely controlled single-pump, dual-chamber, adjustable adaptive fulcrum structure is proposed, possessing significant engineering application value. Summary of the Invention

[0007] To address the aforementioned shortcomings of existing technologies, an adaptive radial load main thrust bearing and large ship propeller shaft system are provided, which realizes a compact structure and fast-response radial support height adjustment function, significantly improving the intelligence level and load adaptability of the main thrust bearing system.

[0008] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0009] Firstly, the adaptive radial load main thrust bearing includes a housing and a thrust assembly. A thrust cavity is provided inside the housing, an external main shaft is installed inside the housing, and the thrust shaft portion of the external main shaft is located inside the thrust cavity. The thrust assembly is located inside the thrust cavity and on both sides of the thrust shaft.

[0010] It also includes two radial support devices inside the housing, as well as a hydraulic system, sensor module and control system connected to each other; the two radial support devices are located on both sides of the thrust cavity and supported on the main shaft; the two radial support devices are independently controlled;

[0011] The radial support device includes an upper cavity and a lower cavity fixed to the housing, an upper piston and a lower piston slidably connected to the upper and lower cavities, and a bearing structure connected between the upper piston and the lower piston. The bearing structure is sleeved on the main shaft, and the main shaft rotates within the bearing structure. The bearing structure and the upper and lower pistons constitute a floating structure, which floats up and down within the upper and lower cavities. An upper hydraulic cavity is formed between the upper piston and the upper cavity, and a lower hydraulic cavity is formed between the lower piston and the lower wall. The floating position of the floating structure is controlled by adjusting the pressure difference between the upper and lower hydraulic cavities.

[0012] Sensor modules are installed between the upper cavity and the shell, and between the lower cavity and the shell. The hydraulic system is connected to the upper and lower hydraulic cavities. The control system adjusts the pressure difference between the upper and lower hydraulic cavities based on the data monitored by the sensor modules.

[0013] According to the above technical solution, spherical protrusions are provided at the top and bottom of the bearing structure, and spherical grooves are provided at the bottom of the upper piston and the top of the lower piston. The spherical protrusions of the bearing structure are supported between the spherical grooves of the upper piston and the lower piston. The top of the upper piston is slidably connected to the upper cavity, and the bottom of the lower piston is slidably connected to the lower cavity.

[0014] According to the above technical solution, a limiting circular groove is provided in the middle of the spherical protrusion, and a limiting circular rod is provided in the middle of the spherical groove. The radius of the limiting circular groove is larger than the radius of the limiting circular rod, and the specific dimensions are set according to the requirements. When the spherical protrusion is placed in the spherical groove, the limiting circular rod is placed in the limiting circular groove and is limited by the limiting circular rod and the limiting circular groove.

[0015] According to the above technical solution, sealing rings are provided between the upper piston and the upper cavity, and between the lower piston and the lower cavity.

[0016] According to the above technical solution, the bearing structure includes two semi-circular bearing pieces and fasteners. The two semi-circular bearing pieces are fixedly connected by the fasteners to form a circular cavity. The main shaft is placed in the circular cavity and is radially supported by the circular cavity. The gap between the circular cavity and the main shaft is provided with lubricating oil. A spherical protrusion is provided in the middle of the outer wall surface of the semi-circular bearing piece.

[0017] According to the above technical solution, the bearing housing consists of an upper housing and a lower housing, which are connected by bolts. The connected bearing housing has a cavity in the middle for the main shaft to pass through. The cavity is divided into three sections: a radial support device mounting cavity in the left section, a thrust cavity in the middle section, and a radial support device mounting cavity in the right section. End face sealing structures are also provided at both ends of the cavity.

[0018] According to the above technical solution, the sensor module includes a displacement sensor and a load sensor.

[0019] According to the above technical solution, the hydraulic system includes two hydraulic units and a hydraulic oil tank; one hydraulic unit corresponds to one radial support device; the two hydraulic units share one hydraulic oil tank and are simultaneously connected to the hydraulic oil tank.

[0020] According to the above technical solution, the hydraulic unit includes a hydraulic pump and a four-way servo control valve; within the same radial support device, two hydraulic chambers, a set of four-way servo control valves, a hydraulic pump, and a hydraulic oil tank are connected to form a hydraulic circuit with one pump and two chambers. The hydraulic pump is a small electric pump with reversible flow and controllable pressure supply and suction functions.

[0021] Secondly, a large ship propeller shaft system includes a main thrust bearing for adaptive radial load as described above, and a main shaft, which is divided into a front shaft, a middle shaft with a thrust shaft portion, and a rear shaft; the middle shaft is mounted on the main thrust bearing, and the front shaft and the rear shaft are fixedly connected to the middle shaft via flanges.

[0022] The present invention has the following beneficial effects:

[0023] 1. Each radial support device is equipped with two hydraulic oil chambers, one upper and one lower. A floating structure consisting of a piston and bearing is installed between the two hydraulic oil chambers. The lifting and lowering of the fulcrum module is adjusted by controlling the pressure difference between the upper and lower hydraulic cylinders, thereby achieving dynamic adjustment of the support height and load distribution. Additionally, a sensor module is installed between the radial support device and the housing. After receiving signals from the sensor assembly, the control system adjusts the supply / return oil pressure of each hydraulic oil chamber in real time, forming a closed-loop control. This real-time feedback and closed-loop adjustment improve the main thrust bearing's ability to cope with asymmetrical loads and sudden changes in operating conditions.

[0024] This measure enables a compact and fast-response radial support height adjustment function, significantly improving the intelligence level and load adaptability of the main thrust bearing system; and achieving intelligent adjustment behavior of "heavy load support, pressurized and raised, light load support, depressurized and released".

[0025] 2. The spherical contact structure, consisting of spherical protrusions and spherical grooves, enables the radial fulcrum to have a certain self-aligning function and automatically center itself. Combined with hydraulic oil chamber displacement, it forms a "soft + hard" adaptive support structure, enhancing the spindle's centering stability. It can adapt to changes in the operating state of the spindle, such as thermal deformation and load offset, to a certain extent, reducing local wear and vibration caused by eccentricity.

[0026] 3. A single hydraulic pump and servo control valve control the pressure difference between the upper and lower hydraulic chambers of a radial support device. The lifting and lowering adjustment of the fulcrum module is achieved by controlling the pressure difference. There is no need for complex multi-pump distribution and complex hydraulic control pipelines. Multi-directional adaptive adjustment can be achieved with just one controller and servo control valve, which reduces costs and maintenance difficulty.

[0027] 4. The limiting groove and the limiting rod serve as limiting devices to ensure that the spherical protrusion and the spherical groove operate within the allowable range. This limits the maximum range of motion of the support mechanism, ensuring that the bearing still has sufficient stability and safety under extreme working conditions, and improving the reliability of the system operation.

[0028] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it according to the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Specific embodiments of the present invention are given in detail below with reference to the accompanying drawings. Attached Figure Description

[0029] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention.

[0030] Figure 1 This is a schematic diagram of the structure of an embodiment provided by the present invention;

[0031] Figure 2 This is a partial structural schematic diagram of an embodiment provided by the present invention;

[0032] In the diagram, 1. Housing; 1-1. Thrust chamber; 1-2. Upper housing; 1-3. Lower housing; 2. Thrust assembly; 3. Main shaft; 3-1. Thrust shaft section; 4. Radial support device; 4-1. Upper cavity; 4-2. Lower cavity; 4-3. Upper piston; 4-4. Lower piston; 4-5. Bearing structure; 5. Hydraulic system; 5-1. Hydraulic oil tank; 5-2. Hydraulic pump; 5-3. Four-way servo control valve; 6. Sensor module; 7. Control system; 8. Limiting groove; 9. Limiting rod; 10. Sealing ring; 11. End face sealing structure. Detailed Implementation

[0033] The following is in conjunction with the appendix Figure 1-2 The principles and features of the present invention are described below. The examples given are for illustrative purposes only and are not intended to limit the scope of the invention. The invention is described more specifically in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the invention will become clearer from the following description and claims. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the invention.

[0034] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0036] Example 1

[0037] Reference Figures 1-2 As shown, the present invention provides an adaptive radial load main thrust bearing.

[0038] The device includes a housing 1 and a thrust assembly 2. A thrust cavity 1-1 is provided inside the housing. An external main shaft 3 is installed inside the housing, and the thrust shaft portion 3-1 of the external main shaft is located inside the thrust cavity. The thrust assembly is located inside the thrust cavity and on both sides of the thrust shaft. The device also includes two radial support devices 4 provided inside the housing, as well as a hydraulic system 5, a sensor module 6, and a control system 7 connected to each other. The two radial support devices are located on both sides of the thrust cavity and supported on the main shaft. The two radial support devices are independently controlled.

[0039] The radial support device includes an upper cavity 4-1 and a lower cavity 4-2 fixed on the housing, an upper piston 4-3 and a lower piston 4-4 slidably connected to the upper and lower cavities, and a bearing structure 4-5 connected between the upper and lower pistons. The bearing structure is sleeved on the main shaft, and the main shaft rotates within the bearing structure. The bearing structure and the upper and lower pistons constitute a floating structure, which floats up and down within the upper and lower cavities. An upper hydraulic cavity is formed between the upper piston and the upper cavity, and a lower hydraulic cavity is formed between the lower piston and the lower wall. The floating position of the floating structure is controlled by adjusting the pressure difference between the upper and lower hydraulic cavities.

[0040] Sensor modules are installed between the upper cavity and the shell, and between the lower cavity and the shell. The hydraulic system is connected to the upper and lower hydraulic cavities. The control system adjusts the pressure difference between the upper and lower hydraulic cavities based on the data monitored by the sensor modules.

[0041] In the above structure, each radial support device has two hydraulic oil chambers, one upper and one lower. A floating structure consisting of a piston and bearing is installed between the two hydraulic oil chambers. The lifting and lowering of the fulcrum module is adjusted by controlling the pressure difference between the upper and lower hydraulic cylinders, thereby achieving dynamic adjustment of the support height and load distribution. In addition, a sensor module is installed between the radial support device and the housing. After receiving signals from the sensor assembly, the control system adjusts the supply and return oil of each hydraulic oil chamber in real time to form a closed-loop control. This achieves real-time feedback and closed-loop adjustment, improving the main thrust bearing's ability to cope with asymmetrical loads and sudden changes in operating conditions.

[0042] This measure enables a compact and fast-response radial support height adjustment function, significantly improving the intelligence level and load adaptability of the main thrust bearing system; and achieving intelligent adjustment behavior of "heavy load support, pressurized and raised, light load support, depressurized and released".

[0043] In some embodiments, spherical protrusions are provided at the top and bottom of the bearing structure, and spherical grooves are provided at the bottom of the upper piston and the top of the lower piston. The spherical protrusions of the bearing structure are supported between the spherical grooves of the upper and lower pistons. The top of the upper piston is slidably connected to the upper cavity, and the bottom of the lower piston is slidably connected to the lower cavity.

[0044] The spherical contact structure, consisting of spherical protrusions and spherical grooves, gives the fulcrum a certain self-aligning function. Combined with the displacement of the hydraulic oil chamber, it forms a "soft + hard" adaptive support structure, which enhances the spindle's centering stability.

[0045] In some embodiments, a limiting circular groove 8 is provided in the middle of the spherical protrusion, and a limiting circular rod 9 is provided in the middle of the spherical groove. The radius of the limiting circular groove is larger than the radius of the limiting circular rod, and the specific dimensions are set according to requirements. When the spherical protrusion is placed in the spherical groove, the limiting circular rod is placed in the limiting circular groove and is limited by the limiting circular rod and the limiting circular groove.

[0046] The limiting device consists of a limiting groove and a limiting rod, which ensures that the spherical protrusion and the spherical groove operate within the allowable range and avoid excessive movement. The compact structure makes it easy to install in the existing main thrust bearing housing and is suitable for shipboard conditions.

[0047] In some embodiments, sealing rings 10 are provided between the upper piston and the upper cavity, and between the lower piston and the lower cavity, to prevent hydraulic oil leakage.

[0048] In some embodiments, the bearing structure includes two semi-circular bearing pieces and fasteners. The two semi-circular bearing pieces are fixedly connected by the fasteners to form a circular cavity. The main shaft is placed in the circular cavity and is radially supported by the circular cavity. The gap between the circular cavity and the main shaft is provided with lubricating oil. A spherical protrusion is provided in the middle of the outer wall surface of the semi-circular bearing piece.

[0049] In some embodiments, the bearing housing consists of an upper housing 1-2 and a lower housing 1-3, which are connected by bolts. The connected bearing housing has a cavity in the middle for the main shaft to pass through. The cavity is divided into three sections: a radial support device mounting cavity in the left section, a thrust cavity in the middle section, and a radial support device mounting cavity in the right section. An end face sealing structure 11 is also provided at both ends of the cavity.

[0050] In some embodiments, the sensor module includes a displacement sensor and a load sensor. The system is equipped with displacement and load sensors. After receiving signals from the sensor components, the control system adjusts the supply / return oil pressure of each hydraulic chamber in real time, forming a closed-loop control, thereby achieving intelligent adjustment behavior of "heavy load support, increased pressure; light load support, depressurized release". The displacement and load sensors monitor the radial offset of the spindle and the force on the support.

[0051] In some embodiments, the hydraulic system includes two hydraulic units and a hydraulic tank 5-1; one hydraulic unit corresponds to one radial support device; the two hydraulic units share one hydraulic tank and are connected to the hydraulic tank.

[0052] In some embodiments, the hydraulic unit includes a hydraulic pump 5-2 and a four-way servo control valve 5-3; within the same radial support device, two hydraulic chambers, a set of four-way servo control valves, a hydraulic pump, and a hydraulic oil tank are connected to form a hydraulic circuit with one pump and two chambers. The hydraulic pump is a small electric pump with reversible flow and controllable pressure supply and suction functions.

[0053] Each radial support device is equipped with two hydraulic oil chambers, one above the other. A hydraulic pump and a servo control valve are used to control the pressure difference between the upper and lower hydraulic oil chambers of the support point. By controlling the pressure difference, the lifting and lowering of the support module can be adjusted, thereby realizing the dynamic adjustment of the support height and load distribution.

[0054] The working principle of this device is as follows:

[0055] By utilizing the synergistic effect of hydraulic control technology and spherical self-aligning structure, real-time adjustment of the load on the spindle in the radial direction and control of the fulcrum alignment are achieved.

[0056] In this system, the main thrust bearing is equipped with two radial support devices as radial fulcrums. Each radial fulcrum consists of a floating structure and two hydraulic oil chambers, located on the upper and lower sides of the floating structure, respectively. The upper or lower chamber of the hydraulic oil chamber is connected to a spherical piston of the floating structure. Each radial fulcrum is equipped with a hydraulic unit. The pump outlet of the hydraulic unit is connected to the upper and lower chambers of the radial support device at the same radial fulcrum via servo control valves. The control system can adjust the pressure difference between the two hydraulic chambers.

[0057] When radial offset occurs during spindle operation, causing excessive load on a certain radial support point, the system detects the force change at that radial support point through displacement and load sensors. The system then controls the corresponding servo control valve to adjust the hydraulic pressure difference between the upper and lower chambers of that radial support point, thereby driving the floating structure to adjust up and down. This allows the radial support point to rise or fall relatively, returning the spindle to its center position. For radial support points with smaller loads, the chamber pressure is appropriately reduced, causing the support height to decrease, thus achieving load balance between the two radial support points.

[0058] Throughout the operation, the hydraulic pump provides stable pressure, the servo control valve adjusts rapidly according to the control signal, and the spherical structure provides the necessary self-aligning angle and flexible support. With the combined effect of these three, the spindle can achieve continuous adaptive adjustment in dynamic load environments, ensuring that it is in an ideal centered state and reducing friction, vibration and wear caused by off-center loads.

[0059] In addition, this system is equipped with limit devices to restrict the displacement range of the fulcrum module, preventing excessive offset under abnormal operating conditions that could lead to structural instability. The entire structure is compact and responds quickly, making it particularly suitable for main thrust bearing applications in marine propulsion systems that require long-term exposure to varying load conditions.

[0060] When the shaft center shifts or the load on the fulcrum changes, the radial support device responds automatically and adjusts the position of the fulcrum to achieve continuous centering support and balanced distribution of radial load for the main shaft under complex sea conditions.

[0061] Example 2

[0062] The present invention also provides a large ship propeller shaft system, including a main thrust bearing for adaptive radial load as described above, and a main shaft, the main shaft being divided into a front shaft, a middle shaft with a thrust shaft portion, and a rear shaft; the middle shaft is mounted on the main thrust bearing, and the front shaft and the rear shaft are fixedly connected to the middle shaft via flanges.

[0063] During the operation of the main thrust bearing, if the main shaft shifts to one side due to load changes or hull structure deformation, the sensor module at that support point will detect an increase in load or a larger shift value. The control system will then control the hydraulic oil chamber at that radial support point to pressurize and the hydraulic oil chamber at the lower side to depressurize, causing the floating structure to move downward and gradually push the main shaft back to the center. At the same time, the other support point will automatically or collaboratively adjust and increase the support stiffness to maintain the balance of the entire shaft.

[0064] In practical applications, ship rolling can cause periodic lateral displacement of the main shaft. To avoid erroneous responses in the control system, this invention can set up filtering and delay logic in the centralized controller to identify rolling characteristics and other signals and shield corresponding responses, thereby ensuring that regulation is initiated only under actual uneven load conditions.

[0065] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Those skilled in the art can readily implement the present invention based on the accompanying drawings and the above description. However, any modifications, alterations, or variations made by those skilled in the art without departing from the scope of the present invention, utilizing the disclosed technical content, are equivalent embodiments of the present invention. Furthermore, any modifications, alterations, or variations made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the present invention.

Claims

1. An adaptive radial load main thrust bearing, including a housing and a thrust assembly, wherein a thrust cavity is provided inside the housing, an external main shaft is installed inside the housing, and the thrust shaft portion of the external main shaft is located inside the thrust cavity, and the thrust assembly is located inside the thrust cavity and on both sides of the thrust shaft. Its features are: It also includes two radial support devices inside the housing, as well as a hydraulic system, sensor module and control system connected to each other; the two radial support devices are located on both sides of the thrust cavity and supported on the main shaft; the two radial support devices are independently controlled; The radial support device includes an upper cavity and a lower cavity fixed to the housing, an upper piston and a lower piston slidably connected to the upper and lower cavities, and a bearing structure connected between the upper piston and the lower piston. The bearing structure is sleeved on the main shaft, and the main shaft rotates within the bearing structure. The bearing structure and the upper and lower pistons constitute a floating structure, which floats up and down within the upper and lower cavities. An upper hydraulic cavity is formed between the upper piston and the upper cavity, and a lower hydraulic cavity is formed between the lower piston and the lower wall. The floating position of the floating structure is controlled by adjusting the pressure difference between the upper and lower hydraulic cavities. Sensor modules are installed between the upper cavity and the shell, and between the lower cavity and the shell. The hydraulic system is connected to the upper and lower hydraulic cavities. The control system adjusts the pressure difference between the upper and lower hydraulic cavities based on the data monitored by the sensor modules.

2. The main thrust bearing for adaptive radial load according to claim 1, characterized in that: The bearing structure has spherical protrusions at the top and bottom, and spherical grooves at the bottom of the upper piston and the top of the lower piston. The spherical protrusions of the bearing structure are supported between the spherical grooves of the upper and lower pistons. The top of the upper piston is slidably connected to the upper cavity, and the bottom of the lower piston is slidably connected to the lower cavity.

3. The main thrust bearing for adaptive radial load according to claim 2, characterized in that: A limiting circular groove is provided in the middle of the spherical protrusion, and a limiting circular rod is provided in the middle of the spherical groove. The radius of the limiting circular groove is larger than the radius of the limiting circular rod, and the specific dimensions are set according to the requirements. When the spherical protrusion is placed in the spherical groove, the limiting circular rod is placed in the limiting circular groove and is limited by the limiting circular rod and the limiting circular groove.

4. The main thrust bearing for adaptive radial load according to claim 2, characterized in that: A sealing ring is provided between the upper piston and the upper cavity, and between the lower piston and the lower cavity.

5. The main thrust bearing for adaptive radial load according to claim 2, characterized in that: The bearing structure includes two semi-circular bearing pieces and fasteners. The two semi-circular bearing pieces are fixedly connected by the fasteners to form a circular cavity. The main shaft is placed in the circular cavity and is radially supported by the circular cavity. The gap between the circular cavity and the main shaft is provided with lubricating oil. A spherical protrusion is located in the middle of the outer wall surface of the semi-circular bearing piece.

6. The main thrust bearing for adaptive radial load according to claim 1, characterized in that: The bearing housing consists of an upper housing and a lower housing, which are connected by bolts. The connected bearing housing has a cavity in the middle for the main shaft to pass through. The cavity is divided into three sections: a radial support device mounting cavity in the left section, a thrust cavity in the middle section, and a radial support device mounting cavity in the right section. End face sealing structures are also provided at both ends of the cavity.

7. The main thrust bearing for adaptive radial load according to claim 1, characterized in that: The sensor module includes a displacement sensor and a load sensor.

8. The main thrust bearing for adaptive radial load according to claim 1, characterized in that: The hydraulic system includes two hydraulic units and a hydraulic tank; each hydraulic unit corresponds to a radial support device; the two hydraulic units share a hydraulic tank and are connected to the hydraulic tank simultaneously.

9. The main thrust bearing for adaptive radial load according to claim 2, characterized in that: The hydraulic unit includes a hydraulic pump and a four-way servo control valve. Within the same radial support device, two hydraulic chambers, a set of four-way servo control valves, a hydraulic pump, and a hydraulic oil tank are connected to form a hydraulic circuit with one pump and two chambers. The hydraulic pump is a small electric pump with reversible flow and controllable pressure supply and suction functions.

10. A large ship propeller shaft system, characterized in that: It includes a main thrust bearing for adaptive radial load as described in any one of claims 1-9, and a main shaft, the main shaft being divided into a front shaft, a middle shaft with a thrust shaft portion, and a rear shaft; the middle shaft is mounted on the main thrust bearing, and the front shaft and the rear shaft are fixedly connected to the middle shaft via flanges.

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