A ship propulsion system shaft stern sleeve structure and manufacturing method thereof

Abstract

The present invention belongs to the technical field of ship propulsion system, and relates to a stern shaft sleeve structure of a ship propulsion system shaft system. The present invention also relates to a method for manufacturing a stern shaft sleeve structure of a ship propulsion system shaft system. A rear bearing seat (6) is arranged on the outer ring of a rear epoxy part (5), a front bearing seat (7) is arranged on the outer ring of a front epoxy part (9), an outer sleeve (8) is arranged between the rear bearing seat (6) and the front bearing seat (7), a cavity (16) is formed between the inner sleeve (4) and the outer sleeve (8), and circulating lubricating oil is injected into the cavity (16). The outer sleeve (8) includes a rear pre-installed section (10), a front pre-installed section (11), an embedded section (12), and two C-shaped sealing section assemblies (13). The stern shaft sleeve structure of a ship propulsion system shaft system described in the present invention can simplify the processing procedures, shorten the construction period, and avoid adverse effects and damage to the epoxy part, thereby improving the overall performance and service life.

Description

Technical Field

[0001] The present invention belongs to the technical field of ship propulsion systems, and more specifically, relates to a stern shaft sleeve structure of a ship propulsion system shaft system. The present invention also relates to a manufacturing method of the stern shaft sleeve structure of a ship propulsion system shaft system. Background Art

[0002] The main function of the ship propulsion system shaft system is to connect the main engine and the propeller, transfer the power output of the main engine to the propeller, and transfer the thrust generated by the propeller axially to the hull, thereby pushing the ship forward or backward. Since the entire propulsion system of the ship is composed of many and complex components, there is a deviation between the transmission shaft and the center line of the gearbox and the main engine shaft during the alignment and installation of the shaft system. During operation, the various components are prone to unbalanced forces. At the same time, the cantilever beam effect of the propeller causes excessive load on the stern bearing, abnormal wear of the bearing, and heat generated by friction. Therefore, the stern shaft of the ship is usually wrapped with a stern shaft sleeve. The front and rear ends of the stern shaft sleeve are welded to the front and rear bearings respectively, and the heat generated by the rotation and friction of the stern shaft is transferred to the stern shaft sleeve. Because the stern shaft sleeve area is usually set as a stern shaft cooling water tank, the heat of the stern shaft sleeve is transferred to the cooling water to cool the stern shaft. In addition, the stern shaft sleeve can also prevent the stern bearing and stern shaft from rusting. Traditional ship shaft systems all add a stern shaft sleeve to the stern shaft, and a stern bearing copper sleeve in the stern bearing seat. The stern bearing between the stern shaft sleeve and the stern bearing sleeve is generally a Sailong bearing. The stern shaft of this combination needs to be bored on site after the stern shaft is pulled on the slipway. The process is complicated, the slipway construction period is long, and the processing accuracy requirements are high. Summary of the invention

[0003] The technical problem to be solved by the present invention is: in view of the shortcomings of the prior art, a stern shaft sleeve structure of a ship propulsion system shaft system is provided which has a simple structure, simplifies the processing procedures, and shortens the construction period, so as to facilitate and reliably form a structure with performance that meets the requirements, while avoiding adverse effects and damage to the epoxy part, thereby forming an epoxy part with high mechanical properties, excellent bonding properties, small curing shrinkage, good processability, and good stability, thereby improving the overall performance and service life.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is:

[0005] The present invention discloses a stern shaft sleeve structure of a ship propulsion system shaft system, comprising a stern shaft, a rear bearing and a front bearing are sleeved on the stern shaft, a gap portion is provided between the rear bearing and the front bearing, an inner sleeve is sleeved on the outer ring of the rear bearing and the outer ring of the front bearing, a rear epoxy portion and a front epoxy portion are arranged on the outer ring of the inner sleeve, a rear bearing seat is arranged on the outer ring of the rear epoxy portion, a front bearing seat is arranged on the outer ring of the front epoxy portion, an outer sleeve is arranged between the rear bearing seat and the front bearing seat, a cavity portion is formed between the inner sleeve and the outer sleeve, circulating lubricating oil is injected into the cavity portion, and the outer sleeve comprises an annular rear pre-installed section, an annular front pre-installed section, an annular embedded section, and two C-shaped sealing pipe section assemblies, which are arranged to form an annular sealing pipe section structure after the two sealing pipe section assemblies are connected.

[0006] The rear pre-installed section, the front pre-installed section, the embedded section and the sealed pipe section are sleeved on the outer ring of the stern shaft, and the diameters of the rear pre-installed section, the front pre-installed section, the embedded section and the sealed pipe section are all larger than the diameter of the stern shaft.

[0007] One end of the rear preinstallation section of the outer sleeve is welded to the side of the rear bearing seat, the other side of the rear preinstallation section is welded to one side of the sealing pipe section, the other side of the sealing pipe section is welded to one side of the embedded section, the other side of the embedded section is welded to one side of the front preinstallation section, and the other side of the front preinstallation section is welded to the side of the front bearing seat.

[0008] The diameters of the rear preinstallation section, the front preinstallation section, the pre-embedded section and the pipe sealing section are respectively set to be equal.

[0009] A steel liner is provided on the inner wall joint surface of the other side of the rear pre-installed section welded to the sealing pipe section, a steel liner is provided on the inner wall joint surface of the other side of the sealing pipe section welded to the embedded section, and a steel liner is provided on the inner wall joint surface of the other side of the embedded section welded to the front pre-installed section.

[0010] The joint between the rear pre-installed section and the sealing pipe section is in a V-shaped structure, and a welding spot is formed at the V-shaped structure. The joint between the sealing pipe section and the embedded section is in a V-shaped structure, and a welding spot is formed at the V-shaped structure. The joint between the embedded section and the front pre-installed section is in a V-shaped structure, and a welding spot is formed at the V-shaped structure.

[0011] An oil filling plug is arranged on a sealing pipe section assembly of the outer sleeve.

[0012] The present invention also relates to a method for manufacturing a stern shaft sleeve structure of a ship propulsion system shaft system with simple steps, which can simplify the processing procedures, shorten the construction period, conveniently and reliably form a structure with performance that meets the requirements, and avoid adverse effects and damage to the epoxy part, thereby forming an epoxy part with high mechanical properties, excellent bonding properties, small curing shrinkage, good processability, and good stability, thereby improving the overall performance and service life. The manufacturing steps of the manufacturing method of the stern shaft sleeve structure of the ship propulsion system shaft system are as follows:

[0013] S1. The rear bearing and the front bearing are mounted on the stern shaft, the rear bearing, the front bearing and the stern shaft form a stern shaft assembly, and the stern shaft assembly is inserted into the inner sleeve;

[0014] S2. The rear pre-installed section of the outer sleeve is welded to the rear bearing seat, and the front pre-installed section of the outer sleeve is welded to the front bearing seat;

[0015] S3. The embedded section of the outer sleeve is set onto the outer ring of the stern shaft assembly, the stern shaft assembly is inserted into the inner hole of the rear bearing seat and the inner hole of the front bearing seat, the rear bearing seat and the inner sleeve are fixed by injecting epoxy resin to form the rear epoxy portion, and the front bearing seat and the inner sleeve are fixed by injecting epoxy resin to form the front epoxy portion;

[0016] S4. Weld the embedded section to the front preinstalled section, weld the two sealed pipe section assemblies to the rear preinstalled section and the embedded section respectively, and weld the two sealed pipe section assemblies again to form a sealed pipe section, inject circulating lubricating oil into the cavity, and complete the production of the stern shaft sleeve structure of the ship propulsion system shaft system.

[0017] When welding the rear pre-installed section to the side of the rear bearing seat and the front pre-installed section to the side of the front bearing seat, measure the temperature of the temperature measuring point at the connection between the rear pre-installed section and the rear bearing seat and the temperature of the temperature measuring point at the connection between the front pre-installed section and the front bearing seat in real time. During the welding process, the temperatures of the two temperature measuring points cannot exceed the maximum heat resistance temperature of the epoxy cured material of 90°C.

[0018] After welding the outer casing, the weld is repaired and polished.

[0019] The technical solution of the present invention is adopted, and the working principle and beneficial effects are as follows:

[0020] The ship propulsion system shaft stern sleeve structure of the present invention is provided with an inner sleeve and an outer sleeve respectively, a cavity is formed between the outer sleeve and the inner sleeve, and a cavity is formed between the inner sleeve and the rear bearing seat, which is convenient for injecting epoxy resin to form the rear epoxy part, and a cavity is formed between the inner sleeve and the front bearing seat, which is convenient for injecting epoxy resin to form the front epoxy part. In this way, the shaft system installation is completed after the epoxy part is cured, and the long cycle and high processing precision requirement of on-site boring are omitted. Epoxy resin pouring construction is convenient, and epoxy has the characteristics of high mechanical properties, excellent bonding properties, small curing shrinkage, good processability, good stability, etc. The heat resistance of epoxy cured product is generally 80-100°C, and the heat-resistant variety of epoxy resin can reach 200°C or higher. The epoxy material usually used for ship shaft casting has a maximum heat-resistant temperature of about 90°C. Therefore, after the epoxy pouring construction is completed, the epoxy cured product should be prevented from being heated above its heat-resistant temperature during the construction site and the operation of the shaft system. In order to solve this problem, the present application changes the structure and construction method of the outer sleeve, and divides the outer sleeve into a rear pre-installed section, a front pre-installed section, an embedded section and a sealing section, wherein the pre-installed section is located at both ends of the outer sleeve, the rear pre-installed section is welded to the side of the rear bearing seat, and the front pre-installed section is welded to the side of the front bearing seat. The pre-installed section and the corresponding bearing seat are welded in advance, and the embedded section is also in place in advance. After the stern shaft is positioned and fixed, epoxy pouring construction is carried out. After the epoxy part is completed and accepted, the sealing section is welded. In this way, because the pre-installed section is welded before the epoxy resin is injected, and after the epoxy part is formed, only the pre-installed section, the embedded section and the sealing section away from the epoxy part need to be welded. In this way, the high temperature during welding is effectively avoided from affecting the epoxy part, ensuring that the temperature of the epoxy part is always below 90°C, ensuring that the epoxy part will not be damaged by the influence of high temperature, and protecting the epoxy part. At the same time, after the outer sleeve is formed, the cavity part is formed, and then circulating lubricating oil is injected into the cavity part to achieve oil cooling of the entire device. The stern shaft sleeve structure of the ship propulsion system shaft system described in the present invention has a simple structure, can simplify the processing procedures, shorten the construction period, and conveniently and reliably form a structure with performance that meets the requirements, while avoiding adverse effects and damage to the epoxy part, forming an epoxy part with high mechanical properties, excellent bonding properties, small curing shrinkage, good processability, and good stability, thereby improving the overall performance and service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The following is a brief description of the contents and symbols in the drawings of this specification:

[0022] Figure 1 It is a structural schematic diagram of the stern shaft sleeve structure of the ship propulsion system shaft system according to the present invention;

[0023] Figure 2 It is a schematic cross-sectional structural diagram of the stern shaft sleeve structure of the shaft system of the ship propulsion system according to the present invention;

[0024] Figure 3 for Figure 2 A schematic diagram of a partially enlarged structure of a portion A of the stern shaft sleeve structure of the ship propulsion system shaft system;

[0025] The marks in the accompanying drawings are respectively: 1-stern shaft, 2-rear bearing, 3-front bearing, 4-inner sleeve, 5-rear epoxy part, 6-rear bearing seat (stern column casting), 7-front bearing seat, 8-outer sleeve, 9-front epoxy part, 10-rear pre-installed section, 11-front pre-installed section, 12-embedded section, 13-sealed pipe section assembly, 14-sealed pipe section, 15-steel liner, 16-cavity part, 17-temperature measuring point, 18-welding point. DETAILED DESCRIPTION

[0026] The following is a further detailed description of the specific implementation of the present invention, such as the shape, structure, mutual position and connection relationship between the various components involved, the function and working principle of each part, etc., through the description of the embodiments with reference to the accompanying drawings:

[0027] As attached Figure 1 -Attached Figure 3As shown, the present invention is a stern shaft sleeve structure of a ship propulsion system shaft system, comprising a stern shaft 1, a rear bearing 2 and a front bearing 3 are mounted on the stern shaft 1, a gap portion is formed between the rear bearing 2 and the front bearing 3, an inner sleeve 4 is mounted on the outer ring of the rear bearing 2 and the outer ring of the front bearing 3, a rear epoxy portion 5 and a front epoxy portion 9 are arranged on the outer ring of the inner sleeve 4, a rear bearing seat 6 is arranged on the outer ring of the rear epoxy portion 5, a front bearing seat 7 is arranged on the outer ring of the front epoxy portion 9, an outer sleeve 8 is arranged between the rear bearing seat 6 and the front bearing seat 7, a cavity 16 is formed between the inner sleeve 4 and the outer sleeve 8, and circulating lubricating oil is injected into the cavity 16, and the outer sleeve 8 comprises an annular rear pre-installed section 10, an annular front pre-installed section 11, an annular embedded section 12, and two C-shaped sealing pipe section assemblies 13, and the two sealing pipe section assemblies 13 are connected to form a structure capable of forming an annular sealing pipe section 14. The above structure proposes an improved technical solution for the deficiencies in the prior art. An inner sleeve and an outer sleeve are arranged respectively, and a cavity is formed between the outer sleeve and the inner sleeve, and a cavity is formed between the inner sleeve and the rear bearing seat, which is convenient for injecting epoxy resin to form the rear epoxy part, and a cavity is formed between the inner sleeve and the front bearing seat, which is convenient for injecting epoxy resin to form the front epoxy part. In this way, the shaft system installation is completed after the epoxy part is cured, eliminating the long-cycle and high-precision processing process of on-site boring. Epoxy resin pouring construction is convenient, and epoxy has the characteristics of high mechanical properties, excellent bonding properties, small curing shrinkage, good processability, and good stability. The heat resistance of epoxy cured products is generally 80-100°C, and the heat-resistant varieties of epoxy resin can reach 200°C or higher. The epoxy material usually used for ship shafting casting has a maximum heat-resistant temperature of about 90°C. Therefore, after the epoxy pouring construction is completed, the epoxy cured product should be prevented from being heated above its heat-resistant temperature during the construction site and the operation of the shafting. In order to solve this problem, the present application changes the structure and construction method of the outer sleeve, and divides the outer sleeve into a rear pre-installed section, a front pre-installed section, a pre-embedded section and a sealing section, wherein the pre-installed section is located at both ends of the outer sleeve, the rear pre-installed section is welded to the side of the rear bearing seat, and the front pre-installed section is welded to the side of the front bearing seat. The pre-installed section and the corresponding bearing seat are welded in advance, and the pre-embedded section is also in place in advance. After the stern shaft is positioned and fixed, epoxy pouring construction is carried out, and the sealing section is welded after the epoxy part is completed and accepted. In this way, because the pre-installed section is welded before the epoxy resin is injected, and after the epoxy part is completed, only the pre-installed section, the pre-embedded section and the sealing section away from the epoxy part need to be welded. In this way, the high temperature during welding is effectively avoided from affecting the epoxy part, ensuring that the temperature of the epoxy part is always below 90°C, ensuring that the epoxy part will not be damaged by the influence of high temperature, and protecting the epoxy part. At the same time, after the outer sleeve is formed, the cavity part is formed, and then circulating lubricating oil is injected into the cavity part to achieve oil cooling of the entire device.The stern shaft sleeve structure of the ship propulsion system shaft system described in the present invention has a simple structure, can simplify the processing procedures, shorten the construction period, and conveniently and reliably form a structure with performance that meets the requirements, while avoiding adverse effects and damage to the epoxy part, forming an epoxy part with high mechanical properties, excellent bonding properties, small curing shrinkage, good processability, and good stability, thereby improving the overall performance and service life.

[0028] The rear pre-installed section 10, the front pre-installed section 11, the embedded section 12, and the sealing section 14 are sleeved on the outer ring of the stern shaft 1, and the diameters of the rear pre-installed section 10, the front pre-installed section 11, the embedded section 12, and the sealing section 14 are all larger than the diameter of the stern shaft 1. One end of the rear pre-installed section 10 of the outer sleeve 8 is welded to the side of the rear bearing seat 2, the other side of the rear pre-installed section 10 is welded to the side of the sealing section 14, the other side of the sealing section 14 is welded to the side of the embedded section 12, the other side of the embedded section 12 is welded to the side of the front pre-installed section 11, and the other side of the front pre-installed section 11 is welded to the side of the front bearing seat 7. In the above structure, when manufacturing the device, the outer sleeve is divided into different parts, and the timing of welding different parts is different. Before injecting epoxy resin, the rear pre-installed section and the front pre-installed section are welded first, and the high temperature of welding at this time will not affect the epoxy resin, and then the epoxy resin is injected to form the epoxy part. Then weld the embedded section and the sealed pipe section. At this time, the welding part is close to the epoxy part, and the excessive temperature will not be transferred to the epoxy part, ensuring that the temperature of the epoxy part is always below the working temperature of 90°C and is effectively protected.

[0029] The diameters of the rear pre-installed section 10, the front pre-installed section 11, the embedded section 12, and the sealing section 14 are set to be equal. The above structure facilitates the welding of the rear pre-installed section 10, the front pre-installed section 11, the embedded section 12, and the sealing section 14, and the sealing section is set to two parts, which is welded last to achieve the sealing of the entire outer casing, and then the circulating lubricating oil is injected.

[0030] The inner wall joint surface of the other side of the rear pre-installed section 10 welded to the sealing pipe section 14 is provided with a steel liner 15, the inner wall joint surface of the other side of the sealing pipe section 14 welded to the embedded section 12 is provided with a steel liner 15, and the inner wall joint surface of the other side of the embedded section 12 welded to the front pre-installed section 11 is provided with a steel liner 15. The joint of the rear pre-installed section 10 and the sealing pipe section 14 is in a V-shaped structure, and a welding spot is formed at the V-shaped structure. The joint of the sealing pipe section 14 and the embedded section 12 is in a V-shaped structure, and a welding spot is formed at the V-shaped structure. The joint of the embedded section 12 and the front pre-installed section 11 is in a V-shaped structure, and a welding spot is formed at the V-shaped structure. The above structure effectively improves the welding strength and the sealing of the welding part through the setting of the steel liner and the special setting of the structure of the welding spot. The steel liner is an annular structure and is arranged to fit the inner wall of the corresponding section joint of the outer sleeve. After the welding is formed by welding, the welding spot can not only reliably weld the corresponding section, but also reliably connect the steel liner.

[0031] An oil filling plug is provided on a sealing pipe section assembly 13 of the outer sleeve 8 .

[0032] The present invention also relates to a method for manufacturing a stern shaft sleeve structure of a ship propulsion system shaft system with simple steps, which can simplify the processing procedures, shorten the construction period, conveniently and reliably form a structure with performance that meets the requirements, and avoid adverse effects and damage to the epoxy part, thereby forming an epoxy part with high mechanical properties, excellent bonding properties, small curing shrinkage, good processability, and good stability, thereby improving the overall performance and service life. The manufacturing steps of the manufacturing method of the stern shaft sleeve structure of the ship propulsion system shaft system are as follows:

[0033] S1. Install the rear bearing 2 and the front bearing 3 on the stern shaft 1, and the rear bearing 2, the front bearing 3 and the stern shaft 1 form a stern shaft assembly, and insert the stern shaft assembly into the inner sleeve 4; S2. Weld the rear pre-installed section 10 of the outer sleeve 8 to the rear bearing seat 6, and weld the front pre-installed section 11 of the outer sleeve 8 to the front bearing seat 7; S3. Install the embedded section 12 of the outer sleeve 8 to the outer ring of the stern shaft assembly, insert the stern shaft assembly into the inner holes of the rear bearing seat 6 and the inner holes of the front bearing seat 7, and install the rear bearing seat 6 The rear epoxy part 5 formed by injecting epoxy resin is fixed to the inner sleeve 4, and the front bearing seat 7 is fixed to the front epoxy part 9 formed by injecting epoxy resin to the inner sleeve 4; S5. The embedded section 12 is welded to the front pre-installed section 11, and the two sealing pipe section assemblies 13 are respectively welded to the rear pre-installed section 10 and the embedded section 12, and the two sealing pipe section assemblies 13 are welded again to form a sealing pipe section 14, and circulating lubricating oil is injected into the cavity 16 to complete the manufacture of the stern shaft sleeve structure of the ship propulsion system shaft system. The above steps divide the outer sleeve into multiple sections, and install and weld them at different times, which not only ensures that a reliable outer sleeve can be formed, but also effectively protects the epoxy part and can also achieve oil cooling.

[0034] When welding the rear pre-installed section 10 to the side of the rear bearing seat 6 and welding the side of the front pre-installed section 11 to the side of the front bearing seat 7, measure the temperature of the temperature measuring point at the connection between the rear pre-installed section 10 and the rear bearing seat 6 and the temperature of the temperature measuring point at the connection between the front pre-installed section 11 and the front bearing seat 7 in real time. During the welding process, the temperatures of the two temperature measuring points cannot exceed the maximum heat resistance temperature of the epoxy cured material of 90°C.

[0035] After welding the outer casing, the weld is repaired and polished.

[0036] The ship propulsion system shaft stern sleeve structure of the present invention is provided with an inner sleeve and an outer sleeve respectively, a cavity is formed between the outer sleeve and the inner sleeve, and a cavity is formed between the inner sleeve and the rear bearing seat, which is convenient for injecting epoxy resin to form the rear epoxy part, and a cavity is formed between the inner sleeve and the front bearing seat, which is convenient for injecting epoxy resin to form the front epoxy part. In this way, the shaft system installation is completed after the epoxy part is cured, and the long cycle and high processing precision requirement of on-site boring are omitted. Epoxy resin pouring construction is convenient, and epoxy has the characteristics of high mechanical properties, excellent bonding properties, small curing shrinkage, good processability, good stability, etc. The heat resistance of epoxy cured product is generally 80-100°C, and the heat-resistant variety of epoxy resin can reach 200°C or higher. The epoxy material usually used for ship shaft casting has a maximum heat-resistant temperature of about 90°C. Therefore, after the epoxy pouring construction is completed, the epoxy cured product should be prevented from being heated above its heat-resistant temperature during the construction site and the operation of the shaft system. In order to solve this problem, the present application changes the structure and construction method of the outer sleeve, and divides the outer sleeve into a rear pre-installed section, a front pre-installed section, a pre-embedded section and a sealing section, wherein the pre-installed section is located at both ends of the outer sleeve, the rear pre-installed section is welded to the side of the rear bearing seat, and the front pre-installed section is welded to the side of the front bearing seat. The pre-installed section and the corresponding bearing seat are welded in advance, and the pre-embedded section is also in place in advance. After the stern shaft is positioned and fixed, epoxy pouring construction is carried out, and the sealing section is welded after the epoxy part is completed and accepted. In this way, because the pre-installed section is welded before the epoxy resin is injected, and after the epoxy part is completed, only the pre-installed section, the pre-embedded section and the sealing section away from the epoxy part need to be welded. In this way, the high temperature during welding is effectively avoided from affecting the epoxy part, ensuring that the temperature of the epoxy part is always below 90°C, ensuring that the epoxy part will not be damaged by the influence of high temperature, and protecting the epoxy part. At the same time, after the outer sleeve is formed, the cavity part is formed, and then circulating lubricating oil is injected into the cavity part to achieve oil cooling of the entire device. The stern shaft sleeve structure of the ship propulsion system shaft system described in the present invention has a simple structure, can simplify the processing procedures, shorten the construction period, and conveniently and reliably form a structure with performance that meets the requirements, while avoiding adverse effects and damage to the epoxy part, forming an epoxy part with high mechanical properties, excellent bonding properties, small curing shrinkage, good processability, and good stability, thereby improving the overall performance and service life.

[0037] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A stern shaft sleeve structure of a ship propulsion system shaft system, characterized in that: The invention comprises a stern shaft (1), a rear bearing (2) and a front bearing (3) are mounted on the stern shaft (1), a gap portion is formed between the rear bearing (2) and the front bearing (3), an inner sleeve (4) is mounted on the outer ring of the rear bearing (2) and the outer ring of the front bearing (3), a rear epoxy portion (5) and a front epoxy portion (9) are arranged on the outer ring of the inner sleeve (4), a rear bearing seat (6) is arranged on the outer ring of the rear epoxy portion (5), a front bearing seat (7) is arranged on the outer ring of the front epoxy portion (9), and the rear bearing seat (6) and the front An outer sleeve (8) is arranged between the bearing seats (7), a cavity (16) is formed between the inner sleeve (4) and the outer sleeve (8), circulating lubricating oil is injected into the cavity (16), the outer sleeve (8) comprises an annular rear pre-installed section (10), an annular front pre-installed section (11), an annular embedded section (12), and two C-shaped sealing pipe section assemblies (13), and the two sealing pipe section assemblies (13) are connected to form a structure capable of forming an annular sealing pipe section (14); The rear pre-installed section (10) of the outer sleeve (8) is welded to the side of the rear bearing seat (6) on one side, the sealing pipe section (14) on the other side is welded to the side of the sealing pipe section (14), the embedded section (12) on the other side is welded to the side of the front pre-installed section (11), and the front pre-installed section (11) on the other side is welded to the side of the front bearing seat (7).

2. The stern shaft sleeve structure of the ship propulsion system shaft system according to claim 1, characterized in that: The rear pre-installed section (10), the front pre-installed section (11), the embedded section (12), and the sealing tube section (14) are sleeved on the outer ring of the stern shaft (1), and the diameters of the rear pre-installed section (10), the front pre-installed section (11), the embedded section (12), and the sealing tube section (14) are all larger than the diameter of the stern shaft (1).

3. The stern shaft sleeve structure of the ship propulsion system shaft system according to claim 1 or 2, characterized in that: The diameters of the rear pre-installation section (10), the front pre-installation section (11), the pre-embedded section (12), and the pipe sealing section (14) are respectively arranged to be equal.

4. The stern shaft sleeve structure of the ship propulsion system shaft system according to claim 1, characterized in that: A steel gasket (15) is provided on the inner wall joint surface of the other side of the rear pre-installed section (10) welded to the sealing pipe section (14), a steel gasket (15) is provided on the inner wall joint surface of the other side of the sealing pipe section (14) welded to the embedded section (12), and a steel gasket (15) is provided on the inner wall joint surface of the other side of the embedded section (12) welded to the front pre-installed section (11).

5. The stern shaft sleeve structure of the ship propulsion system shaft system according to claim 4, characterized in that: The joint between the rear pre-installed section (10) and the sealing tube section (14) is in a V-shaped structure, and a welding spot is formed at the V-shaped structure. The joint between the sealing tube section (14) and the embedded section (12) is in a V-shaped structure, and a welding spot is formed at the V-shaped structure. The joint between the embedded section (12) and the front pre-installed section (11) is in a V-shaped structure, and a welding spot is formed at the V-shaped structure.

6. The stern shaft sleeve structure of the ship propulsion system shaft system according to claim 1 or 2, characterized in that: An oil filling plug is provided on a sealing pipe section assembly (13) of the outer sleeve (8).

7. A method for manufacturing a stern shaft sleeve structure of a ship propulsion system as claimed in claim 1, characterized in that: The manufacturing steps of the manufacturing method of the stern shaft sleeve structure of the ship propulsion system shaft system are as follows: S1. The rear bearing (2) and the front bearing (3) are mounted on the stern shaft (1), the rear bearing (2), the front bearing (3) and the stern shaft (1) form a stern shaft assembly, and the stern shaft assembly is inserted into the inner sleeve (4); S2. The rear pre-installed section (10) of the outer sleeve (8) is welded to the rear bearing seat (6), and the front pre-installed section (11) of the outer sleeve (8) is welded to the front bearing seat (7); S3. The embedded section (12) of the outer sleeve (8) is mounted on the outer ring of the stern shaft assembly, the stern shaft assembly is inserted into the inner hole of the rear bearing seat (6) and the inner hole of the front bearing seat (7), the rear bearing seat (6) and the inner sleeve (4) are fixed by injecting epoxy resin to form a rear epoxy portion (5), and the front bearing seat (7) and the inner sleeve (4) are fixed by injecting epoxy resin to form a front epoxy portion (9); S4. The embedded section (12) is welded to the front pre-installed section (11), and the two sealed pipe section assemblies (13) are respectively welded to the rear pre-installed section (10) and the embedded section (12). The two sealed pipe section assemblies (13) are further welded to form a sealed pipe section (14), and circulating lubricating oil is injected into the cavity (16), thereby completing the manufacture of the stern shaft sleeve structure of the ship propulsion system shaft system.

8. The method for manufacturing the stern shaft sleeve structure of the ship propulsion system shaft system according to claim 7, characterized in that: When welding the rear pre-installed section (10) to the side of the rear bearing seat (6) and welding the side of the front pre-installed section (11) to the side of the front bearing seat (7), the temperature of the temperature measuring point at the connection between the rear pre-installed section (10) and the rear bearing seat (6) and the temperature of the temperature measuring point at the connection between the front pre-installed section (11) and the front bearing seat (7) are measured in real time. During the welding process, the temperatures of the two temperature measuring points cannot exceed the maximum heat resistance temperature of the epoxy cured material of 90°C.

9. The method for manufacturing the stern shaft sleeve structure of the ship propulsion system shaft system according to claim 7 or 8, characterized in that: After welding the outer casing, the weld is repaired and polished.

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