Combined structure of rotor assembly and expansion sleeve support of ship shaft generator

Abstract

The invention discloses a combined structure of a rotor assembly and an expansion sleeve support of a ship shaft generator, and the combined structure is characterized in that the expansion sleeve support comprises an expansion sleeve body and an expansion sleeve boss which extends outwards in the radial direction of the expansion sleeve body, and the expansion sleeve boss is provided with a first through hole which is through in the axial direction; the rotor assembly comprises a rotor support and a rotor boss extending inwards in the radial direction of the rotor support, the rotor boss is provided with a second through hole penetrating in the axial direction, and the inner edge side wall of the rotor boss abuts against the outer edge side wall of the expansion sleeve boss in the direction parallel to the ship shaft. The connecting piece sequentially penetrates through the first through hole and the second through hole so that the rotor boss and the expansion sleeve boss can be tightly attached to form pre-tightening force F, and the pre-tightening force F meets the formula # imgabs0. According to the combined structure, the pre-tightening force is provided through the connecting piece, static friction connection between the rotor boss and the expansion sleeve boss is achieved through the pre-tightening force, and the static friction connection between the rotor boss and the expansion sleeve boss is achieved. Therefore, the damage rate of the bolt due to the action of shearing force in the related technology can be effectively reduced.

Description

Technical Field

[0001] The invention relates to the field of generators for ships, and in particular to a combined structure of a rotor assembly and an expansion sleeve bracket of a ship shaft generator. Background Art

[0002] In the prior art, when adding a generator using a ship shaft, due to the difference in ship shaft size, it is necessary to disassemble the entire generator and design a connecting flange. In addition, the rotor bracket of the generator and the ship shaft connecting flange are fastened by bolts, which are easily damaged by shear force. Summary of the invention The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present invention is to propose a combined structure of a rotor assembly and an expansion sleeve bracket of a ship shaft generator, which is fastened and connected by static friction through structural design, and can effectively reduce the damage of the bolts due to shear force compared to the circumferential connection achieved by bolt fastening in the related art.

[0003] The combined structure of the rotor assembly and the expansion sleeve bracket of the ship shaft generator according to the present invention comprises: An expansion sleeve bracket, the expansion sleeve bracket comprises an expansion sleeve body and an expansion sleeve boss extending outwardly in the radial direction of the expansion sleeve body, and the expansion sleeve boss is provided with a first through hole penetrating in the axial direction; A rotor assembly, the rotor assembly can be opened and closed on the outer peripheral side of the expansion sleeve bracket, the rotor assembly includes a rotor bracket and a rotor boss extending inwardly along the radial direction of the rotor bracket, the rotor boss is provided with a second through hole penetrating along the axial direction, the inner side wall of the rotor boss abuts against the outer side wall of the expansion sleeve boss in a direction parallel to the ship axis, and the first through hole and the second through hole are coaxially arranged; A connecting member, wherein the connecting member is sequentially inserted into the first through hole and the second through hole so that the rotor boss and the expansion sleeve boss are closely fitted to form a preload force F, and the preload force F satisfies: Among them, P is the generator motor power, v is the motor speed, θ1 is the first safety factor, R is the installation radius of the connection between the rotor boss and the expansion sleeve boss, μ is the static friction coefficient between the rotor boss and the expansion sleeve boss, and n is the number of connecting parts.

[0004] According to the combined structure of the rotor assembly and the expansion sleeve bracket of the ship shaft generator in an embodiment of the present invention, a pre-tightening force is provided by a connecting piece, and the pre-tightening force is utilized to realize a static friction connection between the rotor boss and the expansion sleeve boss, thereby effectively reducing the damage rate of the bolts caused by the shear force in the related technology.

[0005] According to an embodiment of the present invention, the first safety factor θ1 ≥ 1.5, and the number n of the connecting members ≥ 15.

[0006] According to one embodiment of the present invention, there are multiple first through holes and multiple second through holes, the multiple first through holes are evenly spaced along the circumference of the expansion sleeve boss, and the multiple second through holes are evenly spaced along the circumference of the rotor boss, and the multiple first through holes correspond one to one to the multiple second through holes.

[0007] According to one embodiment of the present invention, the expansion sleeve bracket is formed by rotating a roughly T-shaped cross-section around the axial direction of the ship shaft, and the expansion sleeve boss is formed on the side of the expansion sleeve body facing away from the ship shaft, and the rotor bracket is formed by rotating a roughly inverted T-shaped cross-section around the axial direction of the ship shaft, and the rotor boss is formed on the side of the rotor bracket facing the ship shaft.

[0008] According to one embodiment of the present invention, the side wall of the expansion sleeve boss opposite to the rotor boss is recessed inwardly in a direction away from the rotor boss to form a first recess, and the side wall of the rotor boss opposite to the expansion sleeve boss is recessed inwardly in a direction away from the expansion sleeve boss to form a second recess, and the side wall of the first recess is connected to the side wall of the second recess by abutment.

[0009] According to one embodiment of the present invention, the first recess is provided with a positioning boss, and the inner edge of the rotor boss in the radial direction at least partially abuts against the positioning boss.

[0010] According to one embodiment of the present invention, the height of the first recess in the radial direction is h1 and the depth in the axial direction is t1, the height of the second recess in the radial direction is h2 and the depth in the axial direction is t2, the height of the positioning boss in the radial direction is h3 and the length in the axial direction is t3, wherein h2>(h1-h3), t1>t3>t2, 25mm≥t3≥15mm.

[0011] According to one embodiment of the present invention, the connecting member is a fastening bolt, the diameter of the fastening bolt is d and the minimum tightening torque T1 of the fastening bolt satisfies: T1≥0.2×F×d×θ2, wherein θ2 is the second safety factor and θ2≥3.

[0012] According to one embodiment of the present invention, the expansion sleeve bracket includes a first expansion sleeve bracket and a second expansion sleeve bracket, the first expansion sleeve bracket and the second expansion sleeve bracket can be opened and closed with each other, the first expansion sleeve bracket and the second expansion sleeve bracket are both provided with a first locking boss, the first locking boss is arranged on the expansion sleeve body and extends radially outward, the gap between the outer edge of the first locking boss and the inner edge of the rotor boss is d, 5mm≤d≤30mm.

[0013] According to one embodiment of the present invention, the rotor bracket includes a first rotor bracket and a second rotor bracket, the first rotor bracket and the second rotor bracket can be opened and closed with each other, the first rotor bracket and the second rotor bracket are both provided with a second locking boss, the second locking boss is provided on the rotor bracket and extends radially inward, and the second locking boss is opposite to the first locking boss in the radial direction.

[0014] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 is a partial cross-sectional view of a ship shaft generator according to an embodiment of the present invention; Figure 2 is a side view of a ship shaft generator according to an embodiment of the present invention; Figure 3 is a three-dimensional diagram of a ship shaft generator according to an embodiment of the present invention; Figure 4 is a front view of a ship shaft generator according to an embodiment of the present invention; Figure 5 is a rear view of a ship shaft generator according to an embodiment of the present invention; Figure 6 is a side view of a ship shaft generator according to an embodiment of the present invention; Figure 7 yes Figure 6 The cross-sectional view along line AA in FIG. Figure 8 is a side view of a ship shaft generator according to an embodiment of the present invention after the ship shaft is removed; Fig. 9 yes Figure 8 The cross-sectional view along line BB in; Fig.10 is a three-dimensional diagram of the combined structure of the rotor assembly and the expansion sleeve bracket according to an embodiment of the present invention; Fig.11 is another stereoscopic diagram of the combined structure of the rotor assembly and the expansion sleeve bracket according to an embodiment of the present invention; Fig.12 is a side view of a combined structure of a rotor assembly and an expansion sleeve bracket according to an embodiment of the present invention; Fig.13 yes Fig.12 A cross-sectional view along line CC in FIG. Fig.14 The present invention Figure 1 Enlarged schematic diagram of the structure at point D in the middle.

[0016] Reference numerals: Ship shaft generator 100; ship shaft 200; combined structure of rotor assembly and expansion sleeve bracket 300; expansion sleeve 10; expansion sleeve bracket 20; expansion sleeve body 21; expansion sleeve boss 22; first recess 221; first locking boss 23; first through hole 222; positioning boss 223; first expansion sleeve bracket 211; second expansion sleeve bracket 212; Rotor assembly 30; rotor bracket 31; rotor boss 32; second locking boss 33; first rotor bracket 311; second rotor bracket 312; second recess 321; second through hole 322; Stator assembly 40; stator bracket 41; first stator sub-bracket 411; second stator sub-bracket 412; stator 42; first slot body 4111; second slot body 4121; outlets 4112, 4123; inlets 4122, 4113; Connecting member 50; front end cover assembly 61; rear end cover assembly 62. DETAILED DESCRIPTION

[0017] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0018] Reference below Figure 1-Figure 13 The combined structure of a rotor assembly and an expansion sleeve bracket of a ship shaft generator according to an embodiment of the present invention is described. The combined structure is applied to the ship shaft generator.

[0019] The combined structure of the rotor assembly and the expansion sleeve bracket of the ship shaft generator according to the embodiment of the present invention includes the expansion sleeve bracket 20 , the rotor assembly 30 and the connecting piece 50 .

[0020] The expansion sleeve bracket 20 includes an expansion sleeve body 21 and an expansion sleeve boss 22. Figure 1 The expansion sleeve boss 22 extends outwardly in the radial direction of the expansion sleeve body 21, and the rotor assembly 30 is openably arranged on the outer peripheral side of the expansion sleeve bracket 20. The rotor assembly 30 includes a rotor bracket 31 and a rotor boss 32 extending radially inwardly along the rotor bracket 31. The inner side wall of the rotor boss 32 abuts against the outer side wall of the expansion sleeve boss 22 in a direction parallel to the ship shaft 200, and the two are pre-tightened and connected by a connecting piece 50, and are clearance-matched with the rotor rotating member in the radial direction.

[0021] In order to achieve static friction fit between the first recess 221 and the second recess 321 under the action of the preload force, the bottom wall of the first recess 221 and the bottom wall of the second recess 321 are stopped and fit, and there is a preload force F between the first recess 221 and the second recess 321, and the preload force F satisfies: Among them, P is the generator motor power, v is the motor speed, θ1 is the first safety factor, R is the installation radius of the connection between the rotor boss 32 and the expansion sleeve boss 22, μ is the static friction coefficient between the rotor boss 32 and the expansion sleeve boss 22, and n is the number of connecting parts 50.

[0022] Therefore, according to the combined structure of the rotor assembly and the expansion sleeve bracket of the ship shaft generator according to the embodiment of the present invention, the expansion sleeve bracket 20 and the rotor assembly 30 are configured as an openable and closable structure, thereby simplifying the assembly process. In addition, a pre-tightening force is provided by the connecting member, and the pre-tightening force is utilized to achieve a static friction connection between the rotor boss and the expansion sleeve boss, thereby effectively reducing the damage rate of the bolts in the related art caused by the shear force.

[0023] In some embodiments of the present invention, the ship shaft generator comprises a combined structure of a rotor assembly and an expansion sleeve bracket of the ship shaft generator according to an embodiment of the present invention, at least two sets of expansion sleeves 10 and a stator assembly 40.

[0024] At least two groups of expansion sleeves 10 are expansion sleeves 10 with different inner diameter specifications, and the expansion sleeves 10 can be detachably arranged on the outer peripheral side of the ship shaft 200. The expansion sleeve bracket 20 is designed as an openable and closable structure, which is opened and closed on the outer peripheral side of the ship shaft 200, so that the expansion sleeve 10 is clamped between the expansion sleeve bracket 20 and the ship shaft 200. Different sizes of expansion sleeves 10 are adapted to ship shafts 200 with different diameters, thereby avoiding the need to add flanges and improving the convenience of disassembly and assembly.

[0025] The expansion sleeve bracket 20 includes an expansion sleeve body 21 and an expansion sleeve boss 22. Figure 1 The expansion sleeve boss 22 extends outwardly in the radial direction of the expansion sleeve body 21, and the rotor assembly 30 can be opened and closed on the outer peripheral side of the expansion sleeve bracket 20. The rotor assembly 30 includes a rotor bracket 31 and a rotor boss 32 extending radially inward along the rotor bracket 31. The inner side wall of the rotor boss 32 stops against the outer side wall of the expansion sleeve boss 22 in a direction parallel to the ship shaft 200, and the two are pre-tightened and connected by a connecting piece 50. The stator assembly 40 can be opened and closed on the outer peripheral side of the rotor assembly 30, and is clearance-matched with the rotor rotating part in the radial direction.

[0026] According to the ship shaft generator according to the embodiment of the present invention, by adopting the combined structure of the rotor assembly and the expansion sleeve bracket of the ship shaft generator according to the embodiment of the present invention, the static friction connection between the rotor boss and the expansion sleeve boss is achieved by utilizing the pre-tightening force, thereby effectively reducing the damage rate of the bolts caused by the shear force in the related technology and simplifying the assembly process.

[0027] like Figure 1 , Fig.13 In some embodiments of the present invention, the cross-section of the expansion sleeve bracket 20 along the radial direction is roughly formed into a T shape, the expansion sleeve bracket 20 is formed by rotating the T-shaped cross-section around the axial direction of the ship shaft 200, and the expansion sleeve boss 22 is formed on the side of the expansion sleeve body 21 facing away from the ship shaft 200.

[0028] like Figure 1 , Fig.13 In some embodiments of the present invention, the rotor bracket 31 is formed by rotating a substantially inverted T-shaped cross-section around the axial direction of the ship shaft 200, and the rotor boss 32 is formed on the side of the rotor bracket 31 facing the ship shaft 200. Therefore, the expansion bracket 20 and the rotor bracket 31 are pre-tightened by the expansion boss 22 and the rotor boss 32 respectively, and at the same time, the weight of the components can be further reduced.

[0029] like Figure 1 , Figure 9-13 In some embodiments of the present invention, in order to increase the convenience of disassembly and assembly of the ship shaft 200 with the generator, and at the same time, to facilitate assembly and positioning, the side wall of the expansion sleeve boss 22 opposite to the rotor boss 32 (such as Figure 1 The right side wall in the figure) is recessed inwardly in the direction away from the rotor boss 32 to form a first recessed portion 221, and the side wall of the rotor boss 32 opposite to the expansion boss 22 (such as Figure 1 The left side wall in the middle (in the figure) is recessed inwardly in the direction away from the expansion sleeve boss 22 to form a second recessed portion 321, and the side wall of the first recessed portion 221 is abutted and connected with the side wall of the second recessed portion 321. The recessed portion can facilitate the positioning and installation of the rotor boss 32 and the expansion sleeve boss 22, and can also facilitate the formation of a static friction contact surface between the two according to a preset surface.

[0030] like Figure 1 In some embodiments of the present invention, the first recess 221 is provided with a positioning boss 223, through which the inner edge of the rotor boss 32 in the radial direction at least partially stops against the positioning boss 223 when the assembly is completed. During the disassembly process, by pushing the rotor boss 32 in the axial direction, when the axial movement distance of the rotor boss 32 is greater than the axial length of the positioning boss 223, the friction fit between the rotor boss 32 and the expansion sleeve boss 22 is disengaged.

[0031] like Figure 1 , Figure 13-14 In some embodiments of the present invention, in order to ensure the installation positioning and disassembly and separation effects, the first recess 221 has a height of h1 in the radial direction and a depth of t1 in the axial direction, the second recess 321 has a height of h2 in the radial direction and a depth of t2 in the axial direction, and the positioning boss 223 has a height of h3 in the radial direction and a length of t3 in the axial direction, wherein h2>(h1-h3), t1>t3>t2, 25mm≥t3≥15mm.

[0032] Therefore, by setting h2 greater than (h1-h3), the rotor boss 32 and the expansion boss 22 can be easily positioned when they are in abutment with each other. At the same time, since the height of the positioning boss 223 is set to h3, the rotor boss 32 can be easily moved in the radial direction when it is axially disengaged from the expansion boss 22.

[0033] like Figure 1 , Figure 7 , Fig. 9 and Fig.14 In some embodiments of the present invention, in order to provide a preload force so that a static friction fit is formed between the second recess 321 of the rotor boss 32 and the first recess 221 of the expansion sleeve boss 22, the expansion sleeve boss 22 is provided with a first through hole 222 that penetrates along the axial direction, and the rotor boss 32 is provided with a second through hole 322 that penetrates along the axial direction. When the side wall of the first recess 221 is connected to the side wall of the second recess 321 by abutment, the first through hole 222 and the second through hole 322 are coaxially arranged and connected by a connecting piece 50.

[0034] In a further example, there are multiple first through holes 222 and multiple second through holes 322, the multiple first through holes 222 are evenly arranged and spaced apart circumferentially along the first recess 221, the multiple second through holes 322 are evenly arranged and spaced apart circumferentially along the second recess 321, and the multiple first through holes 222 and the multiple second through holes 322 are coaxially arranged in a one-to-one correspondence, so that uniform pre-tightening of the rotor boss 32 and the expansion sleeve boss 22 is achieved through multiple connecting members 50 (such as connecting bolts), the stability of static friction fit is improved, and uniform force distribution can be achieved to prevent the connecting member 50 from being damaged by shear force.

[0035] In some embodiments of the present invention, the diameter of the fastening bolt is d and the minimum tightening torque T1 of the fastening bolt satisfies: T1≥0.2×F×d×θ2, wherein θ2 is the second safety factor, and θ2≥3.

[0036] For example, in some examples, the motor power is 680w, θ1 is 1.5, the motor speed v is 80, the static friction coefficient μ is 0.15, the installation radius R of the matching flange of the rotor bracket 31 and the expansion sleeve bracket 20 is 0.515m, and 30 M30 bolts are used, then the preload force F satisfies: The minimum tightening torque is T1, which satisfies: like Figure 1 , Figure 13-14 In some embodiments of the present invention, in order to facilitate assembly and disassembly and adapt to ship shafts 200 of different sizes, the expansion sleeve bracket 20 includes a first expansion sleeve bracket 211 and a second expansion sleeve bracket 212. The first expansion sleeve bracket 211 and the second expansion sleeve bracket 212 can be opened and closed with each other. The first expansion sleeve bracket 211 and the second expansion sleeve bracket 212 are both provided with a first locking boss 23. The first locking boss 23 is provided on the expansion sleeve body 21 and extends radially outward. The gap between the outer edge of the first locking boss 23 and the inner edge of the rotor boss 32 is d, 5mm≤d≤30mm.

[0037] like Figure 1 , Figure 13-14 In some embodiments of the present invention, in order to facilitate assembly and disassembly and adapt to ship shafts 200 of different sizes, the rotor bracket 31 includes a first rotor bracket 311 and a second rotor bracket 312, the first rotor bracket 311 and the second rotor bracket 312 can be opened and closed with each other, the first rotor bracket 311 and the second rotor bracket 312 are both provided with a second locking boss 33, the second locking boss 33 is provided on the rotor bracket 31 and extends radially inward, and the second locking boss 33 is opposite to the first locking boss 23 in the radial direction.

[0038] like Figure 1 In some embodiments of the present invention, in order to ensure the power generation efficiency of the generator with the ship shaft 200, the stator assembly 40 includes a stator bracket 41 and a stator 42 arranged on the inner circumferential wall of the stator bracket 41, and the rotor assembly 30 also includes rotors uniformly arranged in the circumferential direction of the outer circumferential wall of the rotor bracket 31, and multiple stators 42 are positioned one by one opposite to multiple rotors.

[0039] like Figure 1 In some embodiments of the present invention, in order to facilitate assembly and disassembly and adapt to ship shafts 200 of different sizes, the stator bracket 41 includes a first stator sub-bracket 411 and a second stator sub-bracket 412, and the first stator sub-bracket 411 and the second stator sub-bracket 412 can be opened and closed with each other.

[0040] like Figure 1 , Figure 3, Figure 7 and Fig. 9 In order to effectively reduce heat generation during the operation of the motor, the first stator support 41 is provided with a first slot body 4111, the first slot body 4111 includes a plurality of first sub-slot bodies spaced apart in the axial direction of the first stator support 41 and extending in the circumferential direction of the first stator support 41, and the plurality of first sub-slot bodies are sequentially connected to each other, and the second stator support 41 is provided with a second slot body 4121, the second slot body 4121 includes a plurality of second sub-slot bodies spaced apart in the axial direction of the second stator support 41 and extending in the circumferential direction of the second stator support 41, and the plurality of second sub-slot bodies are sequentially connected to each other, wherein the outlet of the first slot body 4111 is connected to the inlet of the second slot body 4121. A cooling cycle is formed by passing the coolant into the first slot body 4111 and the second slot body 4121, and the provision of the sub-slot bodies can effectively extend the coolant circulation path and improve the cooling effect.

[0041] like Figure 1-Figure 6 The ship shaft generator 200 according to the second embodiment of the present invention comprises the ship shaft generator according to the first embodiment of the present invention, a front end cover assembly 61 and a rear end cover assembly 62.

[0042] The ship shaft 200 with generator according to the second embodiment of the present invention can be adapted to ship shafts 200 of different sizes by using the ship shaft generator according to the first embodiment of the present invention, and can be easily installed without overall disassembly.

[0043] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0044] In the description of the present invention, "first feature" or "second feature" may include one or more of the features.

[0045] In the description of the present invention, "plurality" means two or more.

[0046] In the description of the present invention, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0047] In the description of the present invention, “on”, “over” and “above” a first feature from a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0048] Other structures and operations of the ship shaft generator according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0049] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0050] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A combined structure of a rotor assembly and an expansion sleeve bracket of a ship shaft generator, characterized in that: include: An expansion sleeve bracket, the expansion sleeve bracket comprises an expansion sleeve body and an expansion sleeve boss extending outwardly in the radial direction of the expansion sleeve body, and the expansion sleeve boss is provided with a first through hole penetrating in the axial direction; A rotor assembly, the rotor assembly can be opened and closed on the outer peripheral side of the expansion sleeve bracket, the rotor assembly includes a rotor bracket and a rotor boss extending inwardly along the radial direction of the rotor bracket, the rotor boss is provided with a second through hole penetrating along the axial direction, the inner side wall of the rotor boss abuts against the outer side wall of the expansion sleeve boss in a direction parallel to the ship axis, and the first through hole and the second through hole are coaxially arranged; A connecting member, wherein the connecting member is sequentially inserted into the first through hole and the second through hole so that the rotor boss and the expansion sleeve boss are closely fitted to form a preload force F, and the preload force F satisfies: Among them, P is the generator motor power, v is the motor speed, θ1 is the first safety factor, R is the installation radius of the connection between the rotor boss and the expansion sleeve boss, μ is the static friction coefficient between the rotor boss and the expansion sleeve boss, and n is the number of connecting parts.

2. The combined structure of the rotor assembly and the expansion sleeve bracket of the ship shaft generator according to claim 1 is characterized in that: The first safety factor θ1 is ≥1.5, and the number of the connecting parts n is ≥15.

3. The combined structure of the rotor assembly and the expansion sleeve bracket of the ship shaft generator according to claim 1 is characterized in that: There are multiple first through holes and multiple second through holes, and the multiple first through holes are evenly spaced along the circumference of the expansion sleeve boss and the multiple second through holes are evenly spaced along the circumference of the rotor boss. The multiple first through holes correspond to the multiple second through holes one by one.

4. The combined structure of the rotor assembly and the expansion sleeve bracket of the ship shaft generator according to claim 3 is characterized in that: The expansion sleeve bracket is formed by rotating a roughly T-shaped cross-section around the axial direction of the ship shaft, and the expansion sleeve boss is formed on the side of the expansion sleeve body facing away from the ship shaft. The rotor bracket is formed by rotating a roughly inverted T-shaped cross-section around the axial direction of the ship shaft, and the rotor boss is formed on the side of the rotor bracket facing the ship shaft.

5. The combined structure of the rotor assembly and the expansion sleeve bracket of the ship shaft generator according to any one of claims 1 to 4, characterized in that: The side wall of the expansion sleeve boss opposite to the rotor boss is recessed inwardly in a direction away from the rotor boss to form a first recess, and the side wall of the rotor boss opposite to the expansion sleeve boss is recessed inwardly in a direction away from the expansion sleeve boss to form a second recess, and the side wall of the first recess is abutted and connected with the side wall of the second recess.

6. The combined structure of the rotor assembly and the expansion sleeve bracket of the ship shaft generator according to claim 5 is characterized in that: The first recess is provided with a positioning boss, and the inner edge of the rotor boss in the radial direction at least partially abuts against the positioning boss.

7. The combined structure of the rotor assembly and the expansion sleeve bracket of the ship shaft generator according to claim 6 is characterized in that: The first recess has a height of h1 in the radial direction and a depth of t1 in the axial direction, the second recess has a height of h2 in the radial direction and a depth of t2 in the axial direction, the positioning boss has a height of h3 in the radial direction and a length of t3 in the axial direction, wherein h2>(h1-h3), t1>t3>t2, 25mm≥t3≥15mm.

8. The combined structure of the rotor assembly and the expansion sleeve bracket of the ship shaft generator according to claim 1, characterized in that: The connecting member is a fastening bolt, the diameter of the fastening bolt is d and the minimum tightening torque T1 of the fastening bolt satisfies: T1≥0.2×F×d×θ2, wherein θ2 is the second safety factor and θ2≥3.

9. The combined structure of the rotor assembly and the expansion sleeve bracket of the ship shaft generator according to claim 1, characterized in that: The expansion sleeve bracket includes a first expansion sleeve bracket and a second expansion sleeve bracket, the first expansion sleeve bracket and the second expansion sleeve bracket can be opened and closed with each other, the first expansion sleeve bracket and the second expansion sleeve bracket are both provided with a first locking boss, the first locking boss is arranged on the expansion sleeve body and extends radially outward, the gap between the outer edge of the first locking boss and the inner edge of the rotor boss is d, 5mm≤d≤30mm.

10. The combined structure of the rotor assembly and the expansion sleeve bracket of the ship shaft generator according to claim 9, characterized in that: The rotor bracket includes a first rotor bracket and a second rotor bracket, the first rotor bracket and the second rotor bracket can be opened and closed with each other, the first rotor bracket and the second rotor bracket are both provided with a second locking boss, the second locking boss is arranged on the rotor bracket and extends radially inward, and the second locking boss is opposite to the first locking boss in the radial direction.

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