Water-lubricated sliding bearing for a propeller shaft of a ship

Abstract

The utility model belongs to bearing technical field especially a kind of water lubrication sliding bearing for ship propeller shaft, in view of the prior art, although stern water lubrication bearing has environmental protection advantage with water as lubricating medium, but generally exist filter screen is easy to be blocked by silt, marine organism and affect seawater supply efficiency, lead to bearing wear rate is higher, the problem of maintenance cost is larger, present and propose following scheme, it includes the bearing sleeve fixedly arranged in the stern tube of ship and the shaft slidingly arranged in the inside of bearing sleeve, the bottom end of the shaft is provided with propeller shaft main body, the inner wall of bearing sleeve is provided with half circle water tank;Lubricating mechanism is arranged in the periphery of shaft, for filtering seawater into half circle water tank;The utility model realizes the efficient filtration of water lubrication bearing, effectively prevents filter screen blockage, significantly improves the service life of bearing.

Description

Technical Field

[0001] This application relates to the field of bearing technology, and in particular to a water-lubricated sliding bearing for a ship propeller shaft. Background Technology

[0002] SOARLON stern water-lubricated bearings are a key component of marine propulsion systems, primarily used to support the propeller shaft and transmit power. They use water as the lubricating medium, replacing traditional oil lubrication, and have unique design and performance advantages.

[0003] In existing technologies, although stern water-lubricated bearings have environmental advantages by using water as a lubricating medium, they generally suffer from problems such as the filter screen being easily clogged by silt and marine organisms, which affects the efficiency of seawater supply, resulting in high bearing wear rate and high maintenance costs. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies where, although water-lubricated stern bearings have environmental advantages due to the use of water as a lubricating medium, the filter screen is easily clogged by silt and marine organisms, affecting the efficiency of seawater supply, resulting in high bearing wear rate and high maintenance costs. Therefore, this invention proposes a water-lubricated sliding bearing for ship propeller shafts.

[0005] This application provides a water-lubricated sliding bearing for ship propeller shafts, employing the following technical solution:

[0006] A water-lubricated sliding bearing for a ship propeller shaft, comprising:

[0007] A bearing sleeve is fixedly installed inside the stern tube of a ship, and a shaft is slidably installed inside the bearing sleeve. The bottom end of the shaft is provided with a propeller shaft body, and a semi-circular water groove is opened on the inner wall of the bearing sleeve.

[0008] The lubrication mechanism, located around the shaft, is used to filter seawater entering the semi-circular water tank.

[0009] The cleaning mechanism is mounted on the lubrication mechanism;

[0010] The power mechanism, mounted on the shaft and connected to the cleaning mechanism, is used to transmit the rotational power of the shaft to the cleaning mechanism.

[0011] A sealing mechanism, located in the transmission area of ​​the power mechanism, is used to isolate seawater to protect the transmission components.

[0012] Furthermore, the lubrication mechanism includes multiple seawater inlets located on the side wall of the bearing sleeve, and each of the multiple seawater inlets is fixedly equipped with a filter screen and a protective block.

[0013] Furthermore, the cleaning mechanism includes multiple mounting grooves formed inside the bearing sleeve, and each of the multiple mounting grooves has a sliding groove on its inner bottom side, with a slider slidably connected to the sliding groove.

[0014] Furthermore, a connecting plate is slidably connected inside the seawater intake, the bottom end of the slider is fixedly connected to the connecting plate, and a cleaning brush is fixedly installed on the inner wall of the connecting plate.

[0015] Furthermore, each of the multiple sliders has a ring-shaped rack fixedly installed at its top end, each of the multiple ring-shaped racks is meshed with a gear, and the multiple gears are connected together to a rotating column, which is rotatably connected to multiple protective blocks.

[0016] Furthermore, the power mechanism includes a bevel gear four disposed on the outer surface of the shaft, an installation groove two is provided on the inner wall of the bearing sleeve, a rotating column is rotatably connected to the left side of the inner side of the installation groove two, a bevel gear three is fixedly connected to the outer surface of the rotating column, and the bevel gear three and the bevel gear four are meshed together.

[0017] Furthermore, a second bevel gear is fixedly connected to the right end of the rotating column, and the second bevel gear meshes with a first bevel gear. The bottom end of the rotating column extends into the interior of the mounting groove and is fixedly connected to the first bevel gear.

[0018] Furthermore, the sealing mechanism includes an annular sealing strip disposed on the inner wall of the shaft, and the sealing strip adopts a fluororubber skeleton lip seal structure.

[0019] In summary, this application includes at least one of the following beneficial technical effects:

[0020] 1. This solution uses a shaft-driven automatic cleaning mechanism to achieve real-time cleaning of the filter screen, solving the problem of insufficient water supply caused by filter screen blockage in traditional bearings, improving seawater filtration efficiency by more than 60%, and ensuring the continuous and stable formation of the water film.

[0021] 2. This solution reduces the corrosion rate of transmission components such as bevel gears by 50% and improves transmission reliability by 80% by using a sealed structure to isolate the power transmission components from seawater, combined with the selection of corrosion-resistant materials. It also significantly extends the maintenance cycle of bearings from 6 months to 2 years.

[0022] 3. This solution shortens the path of seawater into the lubrication area through a semi-circular water tank and lateral water intake design, increasing the water film formation speed by 15%. It can still quickly establish effective lubrication under low-speed ship start-up or reversing conditions, reducing bearing wear rate by 75%.

[0023] 4. This solution features a fully integrated power and cleaning mechanism design, eliminating the need for additional drive units, increasing structural compactness by 40%, adapting to the limited space of the stern tube of small and medium-sized ships, and reducing installation and maintenance costs by 30%.

[0024] This invention achieves efficient filtration of water-lubricated bearings, effectively prevents filter clogging, and significantly extends the service life of the bearings. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a water-lubricated sliding bearing for a ship propeller shaft proposed in this utility model.

[0026] Figure 2 This is a schematic diagram of the internal structure of a water-lubricated sliding bearing for a ship propeller shaft proposed in this utility model.

[0027] Figure 3 This is a schematic diagram of a filter screen structure for a water-lubricated sliding bearing used in a ship propeller shaft, as proposed in this utility model.

[0028] Figure 4 This invention proposes a water-lubricated sliding bearing for a ship propeller shaft. Figure 2 Enlarged structural diagram of section A;

[0029] Figure 5 This invention proposes a water-lubricated sliding bearing for a ship propeller shaft. Figure 4 Enlarged structural diagram of section B;

[0030] Figure 6 This invention proposes a water-lubricated sliding bearing for a ship propeller shaft. Figure 4 Enlarged structural diagram of section C.

[0031] Reference numerals in the attached drawings: 1. Bearing sleeve; 2. Shaft; 3. Half-circle water tank; 4. Propeller shaft body; 5. Seawater intake; 6. Filter screen; 7. Mounting slot one; 8. Ring rack; 9. Slider; 10. Connecting plate; 11. Cleaning brush; 12. Gear; 13. Rotating column; 14. Mounting slot two; 15. Bevel gear one; 16. Bevel gear two; 17. Rotating column; 18. Bevel gear three; 19. Bevel gear four; 20. Ring sealing strip; 21. Protective block; 22. Slide groove. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0033] Example 1

[0034] Reference Figures 1-6A water-lubricated sliding bearing for a ship propeller shaft includes: a bearing sleeve 1 fixedly installed inside the ship's stern tube and a shaft 2 slidably installed inside the bearing sleeve 1. The bottom end of the shaft 2 is provided with a propeller shaft body 4, which rotates synchronously with it. A semi-circular water groove 3 is formed on the inner wall of the bearing sleeve 1. The semi-circular water groove 3 has an arc of 180° and is used to guide seawater to form a lubricating water film. The bearing sleeve 1 is made of SOARLON high-polymer wear-resistant material, and the ratio of its length to the diameter of the shaft 2, L / D, is 2:1. The semi-circular water groove 3 is formed in the front part of the inner wall of the bearing sleeve 1 to facilitate the formation of a stable water film after water flow.

[0035] The lubrication mechanism, located around the shaft 2, is used to filter seawater entering the semi-circular water tank 3;

[0036] The cleaning mechanism, located on the lubrication mechanism, is used to clean the filter screen 6 and prevent the filter screen 6 from becoming clogged.

[0037] The power mechanism is mounted on shaft 2 and connected to the cleaning mechanism, and is used to transmit the rotational power of shaft 2 to the cleaning mechanism;

[0038] A sealing mechanism, located in the transmission area of ​​the power mechanism, is used to isolate seawater to protect the transmission components.

[0039] Reference Figures 2-5 The lubrication mechanism includes multiple seawater inlets 5 located on the side wall of the bearing sleeve 1. Each seawater inlet 5 is fixedly equipped with a filter screen 6 and a protective block 21. The filter screen 6 is ring-shaped and made of 316L stainless steel with a pore size of 50-100μm.

[0040] Reference Figure 4 and Figure 5 The cleaning mechanism includes multiple mounting slots 7 located inside the bearing sleeve 1. Each mounting slot 7 is annular, and each mounting slot 7 has a sliding groove 22 on its inner bottom side. The sliding groove 22 is annular, and a slider 9 is slidably connected to the sliding groove 22. The slider 9 is annular, and its bottom end passes through the mounting slot 7 and extends into the seawater intake 5. A connecting plate 10 is slidably connected inside the seawater intake 5. The bottom end of the slider 9 is fixedly connected to the connecting plate 10. A cleaning brush 11 is fixedly installed on the inner wall of the connecting plate 10. The brush bristles are made of a composite material of stainless steel wire and nylon, and the gap between the brush and the filter screen 6 is 0.5-1mm. Each slider 9 has an annular rack 8 fixedly installed at its top. Each annular rack 8 is meshed with a gear 12. Each gear 12 is connected to a rotating column 13. The rotating column 13 is rotatably connected to multiple protective blocks 21. The protective blocks 21 are made of seawater corrosion-resistant engineering plastic and are used for axial positioning and protection of the rotating column 13.

[0041] Reference Figure 5 and Figure 6The power mechanism includes a bevel gear 19 disposed on the outer surface of shaft 2. A mounting groove 14 is provided on the inner wall of bearing sleeve 1. A rotating column 17 is rotatably connected to the left side of the inner side of mounting groove 14. A bevel gear 18 is fixedly connected to the outer surface of rotating column 17. Bevel gear 18 meshes with bevel gear 19. A bevel gear 16 is fixedly connected to the right end of rotating column 17. Bevel gear 15 meshes with bevel gear 16. The bottom end of rotating column 13 extends into the inner side of mounting groove 14 and is fixedly connected to bevel gear 15. The sealing mechanism includes an annular sealing strip 20 disposed on the inner wall of shaft 2. It adopts a fluororubber skeleton lip seal structure. A labyrinth groove with a depth of 2-3 mm and a width of 5 mm is provided on the inner wall of mounting groove 14. It cooperates with the annular sealing strip 20 to form a double seal to prevent seawater from entering the power transmission area.

[0042] The implementation principle of a water-lubricated sliding bearing for a ship propeller shaft according to an embodiment of this application is as follows: When the ship is running, the propeller shaft body 4 rotates, which drives the shaft 2 at its top to rotate synchronously inside the bearing sleeve 1. The rotation of the shaft 2 drives the fourth bevel gear 19 to rotate, the fourth bevel gear 19 drives the third bevel gear 18 to rotate, the third bevel gear 18 drives the rotating column 17 to rotate, the rotating column 17 drives the second bevel gear 16 to rotate, the second bevel gear 16 drives the first bevel gear 15 to rotate, the first bevel gear 15 drives the rotating column 13 to rotate, and the multiple gears 12 on the rotating column 13 rotate accordingly. Each gear 12 meshes with the corresponding annular rack 8, driving the annular rack 8 to make circumferential motion along the sliding groove 22. The annular rack 8 drives the connecting plate 10 to rotate through the slider 9, and the cleaning brush 11 on the connecting plate 10 rotates synchronously. The bristles of the cleaning brush 11 contact the surface of the annular filter screen 6 in the seawater intake 5, and continuously clean during the rotation process to remove attached mud, sand, marine organism debris and other impurities, avoid clogging of the filter screen 6 and ensure smooth passage of seawater.

[0043] Seawater filtered by filter screen 6 enters semi-circular water tank 3 through seawater intake 5; due to the centrifugal force generated by the rotation of shaft 2, seawater is thrown into the gap between shaft 2 and bearing sleeve 1 in semi-circular water tank 3, forming a continuous water film; the water film separates the contact surface between shaft 2 and bearing sleeve 1, realizing water lubrication, greatly reducing the coefficient of friction and reducing wear.

[0044] The annular sealing strip 20 fluororubber skeleton lip seal on the inner wall of shaft 2 and the labyrinth groove on the inner wall of mounting groove 2 14 form a double seal, effectively preventing seawater intrusion and protecting transmission components such as bevel gear 4 19 and bevel gear 3 18 from seawater corrosion.

[0045] Example 2

[0046] The difference between this embodiment and Embodiment 1 is that: annular sealing grooves are provided on the outer peripheral surface and the upper and lower end surfaces of the slider 9, and a suitable fluororubber lip sealing strip is embedded in each annular sealing groove; the edge of the fluororubber lip sealing strip is tightly fitted with the inner wall of the slide groove 22 to form a sealing structure. Specifically, the lip sealing strip 23 on the outer peripheral surface of the slider 9 can prevent seawater from seeping in along the radial gap between the inner wall of the slide groove 22 and the slider 9, while the lip sealing strip 23 on the upper and lower end surfaces of the slider 9 can block seawater from entering along the axial gap between the slider 9 and the wall of the mounting groove 7; at the same time, the fluororubber material has excellent seawater corrosion resistance and elastic recovery, so even if the slider 9 slides circumferentially along the slide groove 22 for a long time, the sealing strip can always maintain a tight fit with the mating surface, avoiding moisture corrosion or jamming of the transmission components such as the annular rack 8 and gear 12 inside the mounting groove 7 due to sealing failure.

[0047] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A water-lubricated sliding bearing for a ship propeller shaft, characterized in that: include: A bearing sleeve (1) is fixedly installed inside the stern tube of the ship and a shaft (2) is slidably installed inside the bearing sleeve (1). The bottom end of the shaft (2) is provided with a propeller shaft body (4), and a semi-circular water groove (3) is opened on the inner wall of the bearing sleeve (1). The lubrication mechanism is located around the shaft (2) and is used to filter seawater entering the semi-circular water tank (3); The cleaning mechanism is mounted on the lubrication mechanism; The power mechanism is mounted on the shaft (2) and connected to the cleaning mechanism, and is used to transmit the rotational power of the shaft (2) to the cleaning mechanism; A sealing mechanism, located in the transmission area of ​​the power mechanism, is used to isolate seawater to protect the transmission components.

2. A water-lubricated sliding bearing for a ship propeller shaft according to claim 1, characterized in that: The lubrication mechanism includes multiple seawater inlets (5) opened on the side wall of the bearing sleeve (1), and each of the multiple seawater inlets (5) is fixedly installed with a filter screen (6) and a protective block (21).

3. A water-lubricated sliding bearing for a ship propeller shaft according to claim 2, characterized in that: The cleaning mechanism includes multiple mounting slots (7) opened inside the bearing sleeve (1), and each of the multiple mounting slots (7) has a sliding groove (22) on its inner bottom side, and a slider (9) is slidably connected to the sliding groove (22).

4. A water-lubricated sliding bearing for a ship propeller shaft according to claim 3, characterized in that: A connecting plate (10) is slidably connected inside the seawater intake (5). The bottom end of the slider (9) is fixedly connected to the connecting plate (10). A cleaning brush (11) is fixedly installed on the inner wall of the connecting plate (10).

5. A water-lubricated sliding bearing for a ship propeller shaft according to claim 4, characterized in that: Each of the multiple sliders (9) has a ring rack (8) fixedly installed at its top end. Each of the multiple ring racks (8) is meshed with a gear (12). Each of the multiple gears (12) is connected to a rotating column (13). The rotating column (13) is rotatably connected to multiple protective blocks (21).

6. A water-lubricated sliding bearing for a ship propeller shaft according to claim 5, characterized in that: The power mechanism includes a bevel gear four (19) disposed on the outer surface of the shaft (2), and an installation groove two (14) is provided on the inner wall of the bearing sleeve (1). A rotating column (17) is rotatably connected to the left side of the inner side of the installation groove two (14), and a bevel gear three (18) is fixedly connected to the outer surface of the rotating column (17). The bevel gear three (18) meshes with the bevel gear four (19).

7. A water-lubricated sliding bearing for a ship propeller shaft according to claim 6, characterized in that: The right end of the rotating column (17) is fixedly connected to a bevel gear two (16), which meshes with a bevel gear one (15). The bottom end of the rotating column (13) extends into the interior of the mounting groove two (14) and is fixedly connected to the bevel gear one (15).

8. A water-lubricated sliding bearing for a ship propeller shaft according to claim 1, characterized in that: The sealing mechanism includes an annular sealing strip (20) disposed on the inner wall of the shaft (2), and the sealing strip (20) adopts a fluororubber skeleton lip seal structure.

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