Shaft support structure and vessel

Abstract

The application relates to a shaft support structure and a ship, which comprises at least two shaft supports, one end of each of the two shaft supports is fixed to a side wall of a shaft frame structure, and the included angle of the two shaft supports is set as a preset included angle; one of the shaft supports can coincide with the other shaft support after rotating around the center line of the shaft frame structure by a preset angle, that is, the two shaft supports have a mirror image or a symmetric relationship, can form a stable support system in space, effectively disperse loads transmitted by the shaft frame structure, reduce deformation or vibration caused by uneven stress on one side, and the symmetric shaft supports are beneficial to offsetting part of unbalanced moments and reducing transverse and torsional vibration during shafting operation; the shaft support comprises a fixed column and a support arm, one end of the fixed column is inserted into a ship body line type to form an embedded fixing effect, the other end of the fixed column is fixedly connected with one end of the support arm at a preset included angle, and the other end of the support arm is fixedly connected with the shaft frame structure, so that the radial force and the axial force of the shaft frame structure are more reasonably transmitted to the ship body structure, and stress concentration is avoided.

Description

Technical Field

[0001] This invention relates to the field of heat exchanger technology, and more specifically, to a shaft support structure and a ship. Background Technology

[0002] Ships with twin engines and twin propellers are generally designed with shafting supports, which are the main components connecting the shafting to the main hull. These supports are typically single-arm or double-arm. Generally, these supports are relatively large and are constructed from a single, integrated casting; or from multiple castings welded together; or the support arms are assembled from steel plates, with the remaining ends designed as castings, and finally the steel structure arms are welded to the castings to form a complete shafting support.

[0003] Integrated casting solution: Large size, long production cycle, high casting risk, and high casting cost. Separate multi-casting solution: Thick casting arms, typically 150mm-200mm, requiring butt welding between castings, resulting in deep weld bevels and poor weld formation; large weld overlay, high heat input, difficult deformation control, and inability to guarantee casting accuracy; high skill requirements for welders, multi-layer, multi-pass welding, long welding cycle; and difficulty in guaranteeing welding quality. Casting and steel structure arm welding solution: Steel structure arms are lightweight, but to meet strength requirements, the arms have three layers of steel plates, making the end treatment of the castings complex and welding the steel plates to the castings difficult. Summary of the Invention

[0004] This application provides an axis support structure to improve efficiency and construction quality.

[0005] On one hand, this application provides a shaft support structure, including at least two shaft supports, one end of each of the two shaft supports being fixed to the side wall of the shaft support structure, the included angle of the two shaft supports being set at a preset angle, and one shaft support being symmetrically arranged with the other shaft support; the shaft support includes a fixed column and a support arm, one end of the fixed column being inserted into the hull line, the other end of the fixed column being fixedly connected to one end of the support arm at a preset angle, and the other end of the support arm being fixedly connected to the shaft support structure.

[0006] In some alternative embodiments, the fixing column is a cast iron.

[0007] In some optional embodiments, the fixing column includes a first extension, a second extension, and a frustum component. The first extension, the second extension, and the frustum component are connected in sequence. One end of the first extension is inserted into the hull line. The other end of the first extension and one end of the second extension are set at a preset angle. The other end of the second extension and the frustum component are fixedly connected together with the shaft frame.

[0008] In some alternative embodiments, the included angle between the first extension and the second extension ranges from 100° to 150°.

[0009] In some optional embodiments, the fixing post further includes a frustum member, the bottom surface of which is disposed on the end face of the second extension segment away from the first extension segment, the center point of the larger diameter bottom surface of the frustum member coincides with the center point of the end face of the second extension segment, and the radius of the larger diameter bottom surface of the frustum member is smaller than the diameter of the end face of the second extension segment.

[0010] In some optional embodiments, the ratio between the larger diameter base and the smaller diameter base of the frustum is 1:6 to 1:5; the ratio between the larger diameter base diameter and the height of the frustum is 7:10 to 3:5.

[0011] In some alternative embodiments, the support arm includes a support cylinder and a support rod, the support rod being fixed to the end face of the frustum member, and the support cylinder being fixed circumferentially along the end face of the second extension.

[0012] In some optional embodiments, the end face radius of the second extension segment is a predetermined length from the bottom face radius of the frustum component, and the thickness of the support cylinder is equal to the predetermined length.

[0013] In some optional embodiments, one end of the support cylinder is double-sided welded to the end face of the second extension, and the double-sided weld has a 45° angle on both sides. An annular groove is provided at the position where the shaft frame and the other end of the support cylinder meet. A circular protrusion is formed in the area between the annular grooves. The other end of the support cylinder is welded to the annular groove of the shaft frame on both sides. The circular protrusion is welded to the support rod on both sides. The joint of the double-sided weld is 45° on both sides.

[0014] On the other hand, a ship includes the shaft support structure mentioned in any of the above.

[0015] Compared with the prior art, the present invention has the following technical advantages: This application provides a shaft support structure, which includes at least two shaft supports. One end of each shaft support is fixed to the side wall of the shaft frame, and the included angle between the two shaft supports is set at a preset angle. One shaft support is symmetrically arranged with the other shaft support, that is, the two shaft supports have a mirror or symmetrical relationship, which can form a stable support system in space, effectively disperse the load transmitted by the shaft frame, reduce deformation or vibration caused by uneven force on one side, and the symmetrical shaft supports help to offset part of the unbalanced moment and reduce lateral and torsional vibrations during shaft operation. The shaft support includes a fixed column and a support arm. One end of the fixed column is inserted into the hull line to form a fixed action, and the other end of the fixed column is fixedly connected to one end of the support arm at a preset angle. The other end of the support arm is fixedly connected to the shaft frame. This zigzag force transmission path can more rationally transmit the radial and axial forces of the shaft frame to the hull structure and avoid stress concentration. Attached Figure Description

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a partial structural schematic diagram of a shaft support structure provided in one embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of one of the shaft supports provided in one embodiment of the present invention; Figure 3 This is a schematic diagram of another shaft support provided in one embodiment of the present invention; Figure 4 This is a schematic diagram of the fixing structure of the frustum and the support rod according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the fixing structure of the frustum-shaped component and the support cylinder according to an embodiment of the present invention; Figure 6 A schematic diagram of the fixing structure of the support rod and shaft frame provided in another embodiment of the present invention; Figure 7 This is a schematic diagram of the fixing structure of the support cylinder and shaft frame provided in another embodiment of the present invention.

[0017] in, Figures 1-7 The correspondence between the reference numerals and component names in the attached drawings is as follows: 1-Shaft bracket; 11-Fixing column; 111-First extension section; 112-Second extension section; 113-Frustum component; 12-Support arm; 121-Support cylinder; 122-Support rod; 2-Shaft structure; 21-Annular groove; 22-Circular protrusion. Detailed Implementation

[0018] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0019] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0020] Ships with twin engines and twin propellers are generally designed with shafting supports, which are the main components connecting the shafting to the main hull. These supports typically have single or double arms. Generally, these supports are relatively large and are constructed from a single, integrated casting; or from multiple castings welded together; or the support arms are assembled from steel plates, with the remaining ends designed as castings, and finally the steel structure arms are welded to the castings to form a single shafting support 1.

[0021] Integrated casting solution: Large size, long production cycle, high casting risk, and high casting cost. Separate multi-casting solution: Thick casting arms, typically 150mm-200mm, requiring butt welding between castings, resulting in deep weld bevels and poor weld formation; large weld overlay, high heat input, difficult deformation control, and inability to guarantee casting accuracy; high skill requirements for welders, multi-layer, multi-pass welding, long welding cycle; and difficulty in guaranteeing welding quality. Casting and steel structure arm welding solution: Steel structure arms are lightweight, but to meet strength requirements, the arms have three layers of steel plates, making the end treatment of the castings complex and welding the steel plates to the castings difficult.

[0022] This application provides a shaft support structure to improve efficiency and construction quality. Based on the above, there is an urgent need for a shaft support structure applicable to various installation scenarios. The following description, in conjunction with the accompanying drawings, illustrates this point. Figures 1 to 7 A detailed explanation will be provided.

[0023] This application provides a shaft support structure, including at least two shaft supports 1. One end of each shaft support 1 is fixed to the side wall of the shaft support structure 2. The included angle between the two shaft supports 1 is set at a preset angle. One shaft support 1 is symmetrically arranged with the other shaft support 1. The shaft support 1 includes a fixing column 11 and a support arm 12. One end of the fixing column 11 is inserted into the hull line a. The other end of the fixing column 11 is fixedly connected to one end of the support arm 12 at a preset angle. The other end of the support arm 12 is fixedly connected to the shaft support structure 2.

[0024] Specifically, the shaft support structure includes at least two shaft supports 1. One end of each shaft support 1 is fixed to the side wall of the shaft frame 2. The included angle between the two shaft supports 1 is set at a preset angle. After rotating a preset angle around the center line of the shaft frame 2, one shaft support 1 can coincide with the other shaft support 1. That is, the two shaft supports 1 have a mirror or symmetrical relationship, which can form a stable support system in space, effectively disperse the load transmitted by the shaft frame 2, and reduce deformation or vibration caused by uneven force on one side. The symmetrical shaft supports 1 are conducive to offsetting part of the unbalanced moment and reducing the lateral and torsional vibration during shaft operation. The shaft support 1 includes a fixed column 11 and a support arm 12. One end of the fixed column 11 is inserted into the hull line to form a fixed action. The other end of the fixed column 11 is fixedly connected to one end of the support arm 12 at a preset angle. The other end of the support arm 12 is fixedly connected to the shaft frame 2. This zigzag force transmission path can more reasonably transmit the radial and axial forces of the shaft frame 2 to the hull structure and avoid stress concentration.

[0025] In some alternative embodiments, the fixing column 11 is a cast part. Specifically, the casting process can form complex three-dimensional curved surfaces or irregular structures in one step. One end of the fixing column 11 needs to be inserted into the hull line, which is usually streamlined or an irregular free-form surface. Using castings can accurately replicate the internal cavity shape of the mold, which can significantly reduce the processing difficulty compared to welding or forging, and ensure the fit with the outer plate of the hull and the sealing of the insertion section.

[0026] Furthermore, castings are complete metallic bodies, lacking the heat-affected zone and residual stress found in welded structures. When subjected to alternating loads caused by shaft vibrations and hull deformation, the risk of weld cracking is avoided, thereby improving the long-term fatigue life and reliability of the supporting structure. The microstructure of castings also exhibits good vibration damping capabilities.

[0027] In some optional embodiments, the fixing column 11 includes a first extension 111, a second extension 112, and a frustum 113. The first extension 111, the second extension 112, and the frustum 113 are connected in sequence. One end of the first extension 111 is inserted into the hull line. The other end of the first extension 111 and one end of the second extension 112 are set at a preset angle. The other end of the second extension 112 and the frustum 113 are fixedly connected to the shaft frame 2 together.

[0028] Specifically, the first extension segment 111 and the second extension segment 112 are set at a preset angle, which is equivalent to setting another bend inside the fixed column 11. This allows the force from the support arm 12 and the shaft frame 2 to be reoriented a second time through the first extension segment 111, so that the force finally transmitted to the insertion end of the hull line is closer to the normal direction of the hull surface, avoiding excessive bending moment or shear stress at the insertion point. The shaft support 1 is usually located in the area where the hull line changes sharply at the stern or bow of the ship. The three-section structure of the first extension segment 111 → second extension segment 112 → frustum 113 can form a three-dimensional spatial polygonal line, effectively bypassing the stiffeners, welds or other outfitting components of the hull hull plate, ensuring that the insertion point of the fixed column 11 is located in the solid plate position with optimal structural strength, rather than being forced into an area with a steep hull line or insufficient thickness. The frustum component 113, also known as a truncated cone or pyramidal transition section, connects the second extension section 112 to the shaft frame 2. The frustum shape allows for a smooth transition of the cross-sectional area from the larger connection end to the connection end with the shaft frame 2, avoiding abrupt changes in angles or steps. Compared to direct welding or plate connections, this significantly reduces the stress concentration factor at the connection point, making it particularly suitable for shaft support environments subjected to repeated bending and torsional vibrations. The first extension section 111 independently handles the insertion with the hull line. The second extension section 112 plus the frustum component 113 can be pre-assembled into a module with the shaft frame 2. The frustum component 113 itself can serve as the bearing surface for the welding bevel, facilitating the formation of a full-penetration weld with the shaft frame 2.

[0029] In some alternative embodiments, the included angle between the first extension 111 and the second extension 112 is between 100° and 150°.

[0030] Specifically, if the included angle between the first extension segment 111 and the second extension segment 112 is less than 90°, extremely high stress concentration will occur on the inner side of the bend when transmitting loads, and it will be difficult to guarantee internal quality during casting or welding. If the included angle is greater than 150°, the bending effect is not obvious, almost approaching a straight column, losing the significance of the two-stage load direction conversion, and causing the plug end to be subjected to a large bending moment rather than pressure / tension. 100°-150° is in the obtuse angle range, which can effectively deflect the direction of the force and make the stress distribution relatively uniform.

[0031] Optionally, the hull line area curve changes, and the included angle between the first extension segment 111 and the second extension segment 112 is about 120°. This angle range allows the first extension segment 111 to be inserted in a direction close to the normal of the hull line, while the second extension segment 112 connects the frustum component 113 and the shaft frame 2 at a more reasonable angle, avoiding structural self-locking or installation interference due to excessive bending (<100°), and also avoiding insufficient clearance due to excessive bending (>150°).

[0032] Furthermore, for cast steel or ductile iron fixing columns 11, the inner and outer radii of 100°-150° can be designed to be relatively smooth, resulting in good fluidity of the molten metal and reducing the likelihood of shrinkage cavities or hot cracks on the inner side of the bend. When the included angle is within this range, the force from the shaft frame 2 is transmitted to the first extension 111 via the second extension 112, and the force components in the two directions can be balanced, so that the fixing column 11 is mainly subjected to compressive / tensile forces, resulting in a smaller bending moment.

[0033] In some alternative embodiments, the bottom surface of the frustum 113 is disposed on the end face of the second extension 112 away from the end face of the first extension 111, the center point of the larger diameter bottom surface of the frustum 113 coincides with the end face of the second extension 112, and the radius of the larger diameter bottom surface of the frustum 113 is smaller than the diameter of the end face of the second extension 112.

[0034] Specifically, because the radius of the larger base of the frustum 113 is smaller than the radius of the end face of the second extension 112, the end face of the second extension 112 will have a complete annular outer edge. This outer edge can serve as a welding bevel or positioning reference, facilitating precise butt welding with the shaft frame 2 or support arm 12. Furthermore, the weld can be arranged in the annular area, not directly bearing the principal stress transmitted by the frustum 113. If the bottom surface of the frustum 113 and the end face of the second extension 112 have the same diameter and are directly connected, then the connection from the second extension 112 to the frustum 113 is equivalent to a boss or right-angle step. The radius R of the end face of the second extension 112 > the radius R of the bottom surface of the frustum 113 → the actual connection is achieved through an annular plane transition, rather than a sudden reduction in diameter. When stress is transmitted from the second extension 112 to the frustum 113, an "unloading groove" or stress diffusion ring is formed in the annular plane area, preventing bending stress peaks at the root of the frustum 113.

[0035] In some optional embodiments, the ratio between the larger diameter base and the smaller diameter base of the frustum 113 is 1:6 to 1:5; the ratio between the larger diameter base diameter and the height of the frustum 113 is 7:10 to 3:5.

[0036] Furthermore, since the radius of the larger base of the frustum 113 is smaller than the radius of the end face of the second extension 112, the end face of the second extension 112 will have a complete annular outer edge. This outer edge can serve as a welding bevel or positioning reference, facilitating precise butt welding with the shaft frame 2 or the support arm 12. Moreover, the weld can be arranged in the annular area and will not directly bear the principal stress transmitted by the frustum 113.

[0037] In some alternative embodiments, the support arm 12 includes a support cylinder 121 and a support rod 122, the support rod 122 being fixed to the end face of the frustum member 113, and the support cylinder 121 being fixed circumferentially along the end face of the second extension 112.

[0038] Specifically, the support rod 122 connects to the end face of the frustum 113 and primarily transmits axial force, i.e., the main load along the radial or inclined direction of the shaft frame 2. The support cylinder 121 is fixed circumferentially along the end face of the second extension 112, primarily providing resistance to torsion and lateral forces, and constraining the rotation of the support arm 12 about its own axis. The combination of these two elements enables the support arm 12 to withstand both large axial forces and resist bending and torsion, significantly improving the overall structural rigidity.

[0039] The support cylinder 121 is fixed circumferentially along the end face of the second extension 112, mainly providing resistance to torsion and lateral forces, and constraining the rotation of the support arm 12 about its own axis. The support rod 122 connects to the end face of the frustum 113, mainly transmitting axial force, i.e., the main load in the radial or inclined direction along the shaft frame 2. The combination of the two enables the support arm 12 to withstand large axial forces and resist bending and torsion, significantly improving the overall rigidity of the structure.

[0040] Furthermore, the support cylinder 121 distributes part of the load to the entire annular outer edge of the end face of the second extension 112. The end face of the frustum 113 bears the central load through the support rod 122, while the edges of both end faces bear the peripheral load through the support cylinder 121. This dual fixing method, with a center and an outer ring, can significantly reduce the peak stress at the connection and prevent fatigue cracks under alternating loads. Even if one of the force transmission paths, such as the welding or fastening of the support rod 122 and the frustum 113, suffers local damage, the support cylinder 121 can still maintain the basic connection between the support arm 12 and the second extension 112, preventing immediate instability of the shaft support 1. This is particularly important for structures like ship shafting that are subjected to long-term vibration and complex loads.

[0041] Furthermore, the support cylinder 121 can be designed as a standard cylinder or a segmented arc plate, and the support rod 122 can be machined separately to fit the end face of the frustum 113. During assembly, the support rod 122 and the frustum 113 can be aligned and fixed first, and then the support cylinder 121 can be welded or bolted along the circumference to achieve two-step alignment and reduce the difficulty of on-site installation.

[0042] In some optional embodiments, the end face radius of the second extension 112 is a predetermined length from the bottom face radius of the frustum 113, and the thickness of the support cylinder 121 is equal to the value of the predetermined length.

[0043] Specifically, the thickness of the support cylinder 121 is equal to the preset length, and the outer wall of the support cylinder 121 is flush with the outer edge of the end face of the second extension section 112, eliminating steps and edges, reducing local stress concentration, and reducing fluid resistance. Since the thickness of the support cylinder 121 is equal to the radial difference, it means that the support cylinder 121 perfectly fills the annular area on the end face of the second extension section 112 that is not covered by the frustum 113. The support cylinder 121 can make full use of the load-bearing capacity of the annular area. The support cylinder 121 and the support rod 122 form a natural partition in the radial direction: the inner ring support rod 122 transmits axial force, and the outer ring support cylinder 121 transmits bending moment and torque.

[0044] In some alternative embodiments, one end of the support cylinder 121 is double-welded to the end face of the second extension 112, and the double-welded joint is at a 45° angle on both sides.

[0045] Specifically, the double-sided 45° bevel, combined with appropriate blunt edges and gaps, allows the weld metal to fully penetrate the entire joint thickness, avoiding root incomplete fusion or weld bead defects common in single-sided welding. The effective load-bearing cross-section of the weld is equal to the thickness of the base metal, achieving an equal-strength connection. For the shaft support 1 subjected to alternating loads and vibrations, this significantly reduces the risk of fatigue fracture. The double-sided 45° bevel allows for alternating welding from both sides, with the resulting lateral shrinkage and angular deformation canceling each other out. This effectively controls the perpendicularity deviation of the support cylinder 121 axis relative to the end face of the second extension section 112, reducing post-weld straightening procedures. The weld cross-section formed by the 45° bevel is an isosceles triangle. Compared to single-sided welding or steeper bevels, the weld root is wider, the transition at the weld toe is smoother, the stress distribution is more uniform, and the peak stress coefficient is lower.

[0046] In some optional embodiments, an annular groove 21 is provided at the position where the shaft frame 2 and the other end of the support cylinder 121 meet, and a circular protrusion 22 is formed in the area between the annular grooves 21. The other end of the support cylinder 121 is double-welded to the annular groove 21 of the shaft frame 2, and the circular protrusion 22 is double-welded to the support rod 122. The gap of the double-welded joint is 45° on both sides.

[0047] Specifically, the end of the support cylinder 121 is inserted into the annular groove 21 and welded. The annular groove 21 provides lateral constraint to resist lateral shear force and torque. The support rod 122 is butt-welded to the circular protrusion 22. The protrusion serves as the central positioning and force transmission core, mainly bearing axial tension and compression. The combination of the two forms an inner and outer double-ring force transmission system, significantly improving the overall stiffness of the connection under complex loads. The end of the support cylinder 121 and the annular groove 21, as well as the support rod 122 and the circular protrusion 22, have cylindrical or conical surfaces that fit together. During assembly, the support cylinder 121 naturally aligns with the annular groove 21, reducing the reliance on temporary tooling and alignment measurements. Double-sided 45° bevels can be opened between the inner wall of the annular groove 21 and the outer wall of the support cylinder 121, and between the outer wall of the circular protrusion 22 and the outer wall of the support rod 122 to ensure root penetration. For the circular protrusion 22, double-sided welding can be performed along the circumference of the protrusion.

[0048] In this invention, the term "multiple" refers to at least two or more, unless otherwise explicitly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0049] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0050] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A shaft support structure, characterized in that, It includes at least two shaft supports (1), one end of each of the two shaft supports (1) is fixed to the side wall of the shaft frame (2), the included angle of the two shaft supports (1) is set at a preset included angle, and one shaft support (1) is symmetrically arranged with the other shaft support (1); The shaft support (1) includes a fixed column (11) and a support arm (12). One end of the fixed column (11) is inserted into the hull line (a). The other end of the fixed column (11) is fixedly connected to one end of the support arm (12) at a preset angle. The other end of the support arm (12) is fixedly connected to the shaft frame (2).

2. The shaft support structure according to claim 1, characterized in that, The fixed column (11) is a casting.

3. The shaft support structure according to claim 2, characterized in that, The fixed column (11) includes a first extension section (111), a second extension section (112), and a frustum (113). The first extension section (111), the second extension section (112), and the frustum (113) are connected in sequence. One end of the first extension section (111) is inserted into the hull line. The other end of the first extension section (111) and one end of the second extension section (112) are set at a preset angle. The other end of the second extension section (112) and the frustum (113) are fixedly connected to the shaft frame (2).

4. The shaft support structure according to claim 3, characterized in that, The included angle between the first extension segment (111) and the second extension segment (112) is between 100° and 150°.

5. The shaft support structure according to claim 4, characterized in that, The bottom surface of the frustum (113) is located on the end face of the second extension (112) away from the first extension (111). The center point of the larger diameter bottom surface of the frustum (113) coincides with the center point of the end face of the second extension (112). The radius of the larger diameter bottom surface of the frustum (113) is smaller than the diameter of the end face of the second extension (112).

6. The shaft support structure according to claim 5, characterized in that, The ratio between the larger diameter bottom surface and the smaller diameter bottom surface of the frustum (113) is 1:6 to 1:5; the ratio between the larger diameter bottom surface diameter and the height of the frustum (113) is 7:10 to 3:

5.

7. The shaft support structure according to claim 3, characterized in that, The support arm (12) includes a support cylinder (121) and a support rod (122). The support rod (122) is fixed to the end face of the frustum (113), and the support cylinder (121) is fixed circumferentially along the end face of the second extension (112).

8. The shaft support structure according to claim 7, characterized in that, The end face radius of the second extension segment (112) is a predetermined length from the bottom face radius of the frustum component (113), and the thickness of the support cylinder (121) is equal to the value of the predetermined length.

9. The shaft support structure according to claim 8, characterized in that, One end of the support cylinder (121) is welded to the end face of the second extension section (112) on both sides, and the weld joint is at a 45° angle on both sides. An annular groove (21) is provided at the position where the shaft frame (2) is connected to the other end of the support cylinder (121). A circular protrusion (22) is formed in the area between the annular groove (21). The other end of the support cylinder (121) is welded to the annular groove (21) of the shaft frame (2) on both sides. The circular protrusion (22) is welded to the support rod (122) on both sides. The joint of the double-sided weld is 45° on both sides.

10. A ship, characterized in that, Includes the shaft support structure as described in any one of claims 1-9.

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