A functional segmented water-lubricated stern bearing

Abstract

The present invention discloses a function-segmented water-lubricated stern bearing, belonging to the technical field of ship shafting. The stern bearing includes a bearing bushing, a bearing shell, a stern end stop ring and a bow end stop ring; the bearing shell is divided into three sections along the fore-and-aft direction. The function of the bow bearing shell is to increase the cooling water supply entering the stern bearing. The function of the middle bearing shell is to reduce the wear rate of the stern bearing shell and improve the wear resistance of the stern bearing. The function of the stern bearing shell is to support the main weight of the stern shafting and at the same time reduce the frictional excitation noise during the operation of the shafting; the stern end stop ring and the bow end stop ring are installed at both the bow and stern ends of the bearing bushing to prevent the bearing shell from axially moving. The present invention greatly increases the quietness and wear resistance of the water-lubricated stern bearing, and at the same time increases the safety and reliability of the use of the water-lubricated stern bearing.

Description

Technical Field

[0001] The present invention belongs to the technical field of ship shafting, and particularly relates to a functional segmented water lubricated stern bearing. Background Art

[0002] The water lubricated stern bearing in the shafting is an important component for supporting the stern shafting of a submarine. A typical layout form of a general shafting is as Figure 1 shown. In the shown typical layout diagram, the stern bearing at the bow is in a uniformly loaded state, and the stern bearing at the stern is arranged close to the propeller. Due to the concentrated mass cantilever effect of the propeller, the stern bearing in the stern area is in a non-uniform inclined loaded state.

[0003] In the traditional shafting layout, the stern bearing is an important component of the shafting. At present, the structures and materials of submarine stern bearings vary, but in the axial direction, the states and performance parameters of the stern bearings are the same. The bearing bush of the stern bearing and the main shaft cooperate within the entire axial length range to form a circumferential running friction pair. To ensure the safe and reliable operation of the shafting, the stern bearing mainly has the following technical performances: low running friction coefficient, small running wear rate, good water lubrication performance, no abnormal running friction noise, good environmental adaptability, etc. When designing the stern bearing, the above technical performance requirements need to be comprehensively considered, and the mutual coordination of the realization of each technical index is also an important difficulty in bearing design.

[0004] As one of the components of the running friction pair of the shafting, the bearing bush of the stern bearing is required to have a low friction coefficient to reduce friction excitation and noise. Therefore, self-lubricating materials are generally added during the forming of the bearing bush, and the addition of self-lubricating materials will reduce the wear resistance of the bearing bush of the bearing; the clearance between the stern bearing and the main shaft ensures the good operation of the main shaft in the stern bearing. A large clearance of the stern bearing will cause excessive vibration of the shafting, and a small clearance will make it difficult for cooling water to enter the stern bearing, which is not conducive to the lubrication and cooling effect of the stern bearing. At the same time, sediment in the cooling water entering the clearance of the stern bearing will cause abnormal friction and wear to the bearing bush of the stern bearing; under the action of the propeller cantilever load, the load on the bow area of the bearing is very small, and the stern end area is the main load-bearing area, which bears most of the vertical weight load of the shafting. Therefore, the running friction phenomenon in this local area is more significant and prone to generate friction excitation noise.

[0005] From the above analysis, it can be seen that the uniformity of the current stern bearing design in the axial length direction is not conducive to the realization of the comprehensive performance index of the operation of the bearing bush of the stern bearing, and at the same time does not conform to the actual operating conditions of the stern bearing. Summary of the Invention

[0006] In view of this, the present invention provides a function-segmented water-lubricated stern bearing, which can realize the functional partition in multiple intervals of the water-lubricated stern bearing, directly helps to reduce the friction coefficient and wear rate of the water-lubricated stern bearing, and at the same time can enhance the cooling and lubrication effect of the water-lubricated stern bearing, reduce the influence of sediment on the use of the water-lubricated stern bearing, greatly increase the quietness and wear resistance of the water-lubricated stern bearing during use, and at the same time increase the safety and reliability of the water-lubricated stern bearing during use.

[0007] A function-segmented water-lubricated stern bearing includes a bearing bushing, a bearing shell, a stern end stop ring and a bow end stop ring;

[0008] The bearing shell is divided into three sections along the bow-stern direction. The function of the bow bearing shell is to increase the cooling water supply entering the stern bearing. The function of the middle bearing shell is to reduce the wear rate of the bearing shell of the stern bearing and improve the wear resistance of the stern bearing. The function of the stern bearing shell is to support the main weight of the stern shafting and at the same time reduce the frictional excitation noise during the operation of the shafting; the stern end stop ring and the bow end stop ring are installed at both the bow and stern ends of the bearing bushing to prevent the bearing shell from axially moving.

[0009] Further, the stern bearing shell, the middle bearing shell and the bow bearing shell are sequentially sleeved inside the bearing bushing. The inner diameters of the stern bearing shell and the middle bearing shell are the same, and the inner diameter of the bow bearing shell is greater than that of the middle bearing shell; the stern bearing shell is made of a material with a low friction coefficient, and the middle bearing shell is made of a material with a low wear rate; axial through holes are provided on the backs of the stern bearing shell and the middle bearing shell.

[0010] Further, the bow end of the middle bearing shell is designed into an inner inclined structure.

[0011] Further, the number and diameter of the axial through holes on the backs of the stern bearing shell and the middle bearing shell are the same, and the axial through holes on the two are kept communicating with each other after installation.

[0012] Further, through holes are machined on the stern stop ring at positions corresponding to the axial through holes on the stern bearing shell.

[0013] Beneficial effects:

[0014] 1. The stern bearing shell of the stern bearing of the present invention is made of a material with a low friction coefficient, which effectively reduces the frictional excitation and noise of the stern bearing while bearing the main weight of the shafting, realizing the quietness of the operation of the stern bearing. The middle bearing shell is made of a material with a low wear rate, which improves the wear resistance of the stern bearing.

[0015] 2. The cantilever load of the stern propeller of the shafting causes the main shaft to warp upward at the bow end of the stern bearing. The large-diameter structure design of the bearing shell in the bow end area ensures that there will be no rubbing phenomenon between the main shaft and the top of the stern bearing during operation.

[0016] 3. The large-diameter structure design of the bow-end area increases the cooling water supply volume entering the stern bearing, ensuring the cooling and lubrication performance of the stern bearing. At the same time, this structure can stratify the impurities in the cooling water and discharge them to the outside of the equipment through the axial through-holes of the bearing bush, preventing sediment from entering the inside of the stern bearing and causing abnormal friction. Brief Description of the Drawings

[0017] Figure 1 It is a schematic diagram of the typical ship shafting arrangement;

[0018] Figure 2 It is a schematic diagram of the structure of the functional segmented water-lubricated stern bearing of the present invention.

[0019] Among them, 1 - stern stop ring, 2 - stern bearing bush, 3 - bearing liner, 4 - middle bearing bush, 5 - bow bearing bush, 6 - bow stop ring. Specific Embodiments

[0020] The present invention will be described in detail below with reference to the accompanying drawings and by way of examples.

[0021] As shown in the Figure 2 drawings, the present invention provides a functional segmented water-lubricated stern bearing, including a stern stop ring 1, a stern bearing bush 2, a bearing liner 3, a middle bearing bush 4, a bow bearing bush 5, and a bow stop ring 6.

[0022] The bearing liner 3 is the main support structure of the stern bearing, and its main function is to fixedly support the stern bearing bush 2, the middle bearing bush 4, and the bow bearing bush 5 inside it. The bow stop ring 6 and the stern stop ring 1 are respectively arranged at the head and the stern of the bearing to prevent the axial movement of the segmented bearing bushes inside.

[0023] The stern bearing bush 2 supports the main weight of the stern shafting. Low-friction coefficient materials are selected in the design, which can greatly reduce the friction excitation noise during the operation of the shafting. There are axial through-holes on the back of the stern bearing bush 2, and its main function is to discharge the sediment mixed in the water supply at the bow end of the stern bearing.

[0024] Low-wear rate materials are selected for the middle bearing bush 4, and its main function is to improve the wear resistance of the stern bearing. The combined use of the middle bearing bush 4 and the stern bearing bush 2 can comprehensively improve the friction and wear performance of the stern bearing. The bow end of the middle bearing bush 4 is designed into an inner inclined structure to block the sediment mixed in the bow water supply from entering the working surface of the stern bearing. There are axial through-holes on the back, and its main function is to discharge the sediment blocked by the inner inclined structure at the bow end. In order to ensure the smooth discharge of the sediment to the outside of the bearing, through-holes are machined on the stern stop ring 1 at the positions corresponding to the axial through-holes on the stern bearing bush 2.

[0025] The bow bearing 5 adopts a large-diameter structural design, which increases the cooling water supply entering the stern bearing. When sediment is mixed in the cooling water, stratification occurs with the circumferential rotation of the main shaft in this structure, and the sediment on the outer side after stratification is further discharged to the outside of the equipment through the axial through-flow holes provided on the back of the middle bearing 4 and the stern bearing 2. At the same time, the bow bearing 5 with the large-diameter structural design ensures that there is no top rubbing phenomenon when the shafting operates in the bow end area of the stern bearing.

[0026] In summary, the above are only the preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A functional segmented water-lubricated stern bearing, characterized in that, It includes a bearing bush, a shaft bearing, a stern stop ring and a bow stop ring; The shaft bearing is divided into three sections along the bow-stern direction. The function of the bow shaft bearing is to increase the cooling water supply entering the stern bearing. The function of the middle shaft bearing is to reduce the wear rate of the stern bearing bush and improve the wear resistance of the stern bearing. The function of the stern shaft bearing is to support the main weight of the stern shafting and at the same time reduce the frictional excitation noise during the operation of the shafting. The bow stop ring and the stern stop ring are installed at both ends of the bearing bush in the bow and stern directions to prevent the axial movement of the shaft bearing; The stern shaft bearing, the middle shaft bearing and the bow shaft bearing are sequentially sleeved inside the bearing bush. The inner diameters of the stern shaft bearing and the middle shaft bearing are the same, and the inner diameter of the bow shaft bearing is larger than that of the middle shaft bearing. The stern shaft bearing is made of a material with a low friction coefficient, and the middle shaft bearing is made of a material with a low wear rate. Axially penetrating through holes are provided on the backs of the stern shaft bearing and the middle shaft bearing; The bow end of the middle shaft bearing is designed into an inner inclined structure.

2. The segmented functional water-lubricated stern bearing according to claim 1, characterized in that, The number and diameter of the axially penetrating through holes on the backs of the stern shaft bearing and the middle shaft bearing are the same, and the axially penetrating through holes on both of them remain interconnected after installation.

3. The functional segmented water lubricated stern bearing according to claim 1 or 2, characterized in that, Through holes are machined on the stern stop ring at positions corresponding to the axially penetrating through holes on the stern shaft bearing.

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