A lightweight shafting for the main shaft of a blower based on forced lubrication without an oil pump

Abstract

The present invention discloses a lightweight shafting for a forced lubrication fan main shaft without an oil pump, belonging to the field of wind power main shafts, which includes a fan main shaft, a shaft hub, a radial sliding bearing, an oil supply tank, and a bearing housing. The cross-section of the shaft hub is an "I"-shaped structure, and a plurality of radial sliding bearings are installed on the outer ring of the shaft hub; a plurality of the oil supply tanks are installed on both sides inside the shaft hub, and a plurality of radial oil holes are provided on the outer ring of the shaft hub; a bearing housing is provided outside the radial sliding bearing, and an oil storage cavity is provided at the bottom of the bearing housing; a plurality of flow holes are provided inside the bearing housing. The present invention adopts an assembled structure design for the shaft hub and the fan main shaft, designs the shaft hub as an "I"-shaped structure, while achieving the lightweight of the fan main shaft, effectively coping with the deflection and bending stress of the fan main shaft under abnormal working conditions, and realizing direct oil supply to the radial sliding bearing through the built-in oil supply tank, without an external oil pump, simplifying the lubrication system, and reducing the energy consumption and maintenance cost.

Description

Technical Field

[0001] The present invention belongs to the field of wind turbine main shafts, and particularly relates to a lightweight shafting for a wind turbine main shaft based on forced lubrication without an oil pump. Background Art

[0002] With the continuous growth of the global demand for renewable energy, the wind power industry, as an important part of clean energy, has achieved rapid development in recent years. As a key measure to address climate change and energy transformation, the continuous innovation and breakthrough of wind power technology have become the focus of the industry. The fierce competition among enterprises has led to a year-on-year decrease in the unit kilowatt cost of wind power equipment, thus promoting the market trend of wind turbine enlargement. Larger wind turbines not only significantly improve the power generation efficiency but also reduce the manufacturing cost per kilowatt through economies of scale, becoming the mainstream development direction of the wind power industry.

[0003] Although larger wind turbines have significant advantages in improving power generation efficiency and reducing costs, their development is accompanied by a series of technical problems, among which the problems of the main shaft bearings of wind turbines are particularly critical. As the size of the wind turbine increases, the size of the rolling bearings at the main shaft position also increases, which not only leads to a sharp rise in the weight and cost of the bearings but also increases the technical difficulties in installation, maintenance, and operation. In large wind turbines, the proportion of the weight and cost of the main shaft bearings gradually increases, which is contrary to the goal of enlarging wind turbines to reduce the unit kilowatt cost.

[0004] To overcome the limitations of rolling bearings in large wind turbines, the industry has begun to explore the technical path of "replacing rolling with sliding", that is, using sliding bearings to replace traditional rolling bearings. Sliding bearings have received extensive attention due to their high load-bearing capacity, stable operation, and low noise. However, sliding bearings still rely strongly on lubricating oil and require a complex and reliable lubrication system to ensure their normal operation. This not only increases additional cost investment but also poses higher requirements for the design and maintenance of the lubrication system.

[0005] In addition, under extreme weather conditions such as strong winds and temperature changes, the main shaft of the wind turbine may deflect slightly due to uneven stress. This deflection phenomenon not only affects the power generation efficiency of the wind turbine but may also damage the main shaft bearings and the entire transmission system. Therefore, how to ensure the stable operation of the wind turbine main shaft under extreme weather conditions has become an urgent technical problem to be solved. Summary of the Invention

[0006] The object of the present invention is to overcome the deficiencies in the prior art and provide a lightweight shafting for a fan main shaft with forced lubrication without an oil pump, which realizes the lubrication of sliding bearings under the condition of no oil pump. While ensuring the lubrication effect of the sliding bearings, the manufacturing cost of the sliding bearings of the fan main shaft is reduced. At the same time, the shaft hub design with a special structure can withstand the deflection and bending of the fan main shaft under abnormal environmental conditions on the premise of ensuring strength.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] A lightweight shafting for a fan main shaft with forced lubrication without an oil pump, including a fan main shaft, a shaft hub, a radial sliding bearing, an oil supply tank and a bearing seat. There is a shaft shoulder on the fan main shaft, and the shaft hub is installed on one side of the shaft shoulder, and the shaft hub is in interference fit with the fan main shaft; the cross-section of the shaft hub is an "I" - shaped structure, the inner ring of the shaft hub is in interference fit with the fan main shaft, and several radial sliding bearings are installed on the outer ring of the shaft hub; several oil supply tanks are installed on both sides inside the shaft hub, and there are through oil injection holes on the oil supply tanks. There are several radial oil holes on the outer ring of the shaft hub. One end of the radial oil hole is communicated with the oil supply tank, and the other end of the radial oil hole leads to the radial sliding bearing; there is a bearing seat outside the radial sliding bearing, and there is an oil storage cavity at the bottom of the bearing seat, and several rib plates are arranged inside the oil storage cavity; there are several circulation holes in the bearing seat, and the bottom of the shaft hub is immersed in the lubricating oil in the oil storage cavity; there is an end cover on one side of the bearing seat, and there is an oil filling port on one side of the end cover. Sealing elements are provided on the contact surface between the end cover and the bearing seat, the contact surface between the end cover and the fan main shaft, and the contact surface between the bearing seat and the fan main shaft. The sealing elements include oil seals, labyrinth seals or a combination of both.

[0009] Further, there are several thrust bearing grooves on both sides of the shaft hub, and axial thrust bearings are arranged in the thrust bearing grooves.

[0010] Furthermore, several axial oil holes are arranged inside the thrust bearing grooves, several thrust bearing oil outlet holes are arranged on the axial thrust bearings, the thrust bearing oil outlet holes correspond to the axial oil holes, and a hollow plug is threadedly connected inside the thrust bearing oil outlet hole, and the other end of the hollow plug is threadedly connected to the axial oil hole.

[0011] Further, several dovetail grooves are arranged on the inner wall of the bearing seat, and a dovetail is arranged on one side of the radial sliding bearing, and the dovetail of the radial sliding bearing is slidably installed in the dovetail groove.

[0012] Furthermore, several oil distribution grooves arranged in a criss - cross pattern are arranged on the radial sliding bearing, and one end of the radial oil hole is communicated with the oil distribution groove.

[0013] Furthermore, a connecting plate is hinged inside the oil supply tank. One end of the connecting plate is a free end, and a gravity plug is connected to one end of the connecting plate. The gravity plug corresponds to the position of the oil injection hole. When the oil supply tank rotates clockwise with the hub, the gravity plug at the lowest end is in a state of being separated from the oil injection hole under the action of gravity. When the oil supply tank continues to rotate, the gravity plug gradually blocks the oil injection hole.

[0014] Furthermore, a counterweight is provided at one end of the connecting plate, and the gravity plug is arranged at the lower end of the counterweight.

[0015] Furthermore, the gravity plug is of a frustum-shaped structure, and the side of the oil injection hole inside the oil supply tank adopts a funnel shape adapted to the shape of the gravity plug.

[0016] Furthermore, a number of weight-reducing holes are provided on the hub.

[0017] Furthermore, the main shaft of the fan and the hub are made of the same alloy steel material, the bearing housing and the steel back of the radial sliding bearing are made of the same alloy steel material, and a coating is provided on the mating surface of the radial sliding bearing and the hub.

[0018] The beneficial effects of the present invention are as follows:

[0019] 1) In the present invention, the hub and the main shaft of the fan are designed with an assembled structure, and the hub is designed in an "I" shape. While achieving the lightweight of the main shaft of the fan, it effectively deals with the deflection and bending stress of the main shaft of the fan under abnormal working conditions. The direct oil supply to the radial sliding bearing is realized through the built-in oil supply tank, without an external oil pump, simplifying the lubrication system and reducing the energy consumption and maintenance cost.

[0020] 2) Axial thrust bearings are arranged on both sides of the hub, which helps to suppress axial movement and improve the overall operation stability and reliability of the fan.

[0021] 3) By providing axial oil holes and oil outlet holes of the thrust bearing, the lubricating oil in the oil supply tank forms an oil film on the mating surface of the axial thrust bearing and the bearing housing or the end cover, effectively reducing the wear of the axial thrust bearing, the bearing housing or the end cover, and reducing the noise of the operation of the main shaft of the fan.

[0022] 4) The radial sliding bearing and the bearing housing are detachably connected through a dovetail groove, realizing the replacement of the radial sliding bearing in the air and reducing the maintenance cost of the shafting.

[0023] 5) Oil distribution grooves arranged in a criss-cross pattern are provided on the radial sliding bearing, ensuring an adequate amount of lubricating oil on the bearing surface of the radial sliding bearing, enhancing the formation of the oil film, effectively isolating the direct contact between the radial sliding bearing and the hub, reducing friction and wear, and at the same time reducing the noise and vibration of the fan operation. In addition, the oil film also enhances the bearing capacity and service life of the radial sliding bearing.

[0024] 6) A connecting plate is hinged inside the oil tank. A counterweight is provided at the end of the connecting plate, and a gravity plug is provided below the counterweight. When the oil tank rotates to the upper part, the gravity plug automatically blocks the oil injection hole, ensuring the lubrication of the upper radial sliding bearing and axial thrust bearing by the lubricating oil in the oil tank. When the oil tank rotates to the lower part, the gravity plug separates from the oil injection hole, automatically refilling the oil tank.

[0025] 7) Weight-reducing holes are provided on the shaft hub, further reducing the weight of the shafting assembly. At the same time, it improves the dynamic response performance of the shafting, helps reduce the inertial force required to be overcome during the rotation of the fan, and reduces energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of a lightweight shafting structure of a fan main shaft based on forced lubrication without an oil pump according to the present invention.

[0027] Figure 2 It is a schematic diagram of a lightweight shafting of a fan main shaft based on forced lubrication without an oil pump according to the present invention after removing the wind power main shaft and the end cover.

[0028] Figure 3 It is a schematic diagram of a wind power main shaft in a lightweight shafting of a fan main shaft based on forced lubrication without an oil pump according to the present invention.

[0029] Figure 4 It is a schematic diagram of a shaft hub in a lightweight shafting of a fan main shaft based on forced lubrication without an oil pump according to the present invention.

[0030] Figure 5 It is a partial cross-sectional view of a shaft hub in a lightweight shafting of a fan main shaft based on forced lubrication without an oil pump according to the present invention.

[0031] Figure 6 It is a schematic diagram of a radial sliding bearing in a lightweight shafting of a fan main shaft based on forced lubrication without an oil pump according to the present invention.

[0032] Figure 7 It is a schematic diagram of an axial thrust bearing in a lightweight shafting of a fan main shaft based on forced lubrication without an oil pump according to the present invention.

[0033] Figure 8 It is a cross-sectional view of an oil tank in a lightweight shafting of a fan main shaft based on forced lubrication without an oil pump according to the present invention.

[0034] Figure 9 It is a state diagram of the gravity plug rotating to different positions in a lightweight shafting of a fan main shaft based on forced lubrication without an oil pump according to the present invention.

[0035] Figure 10 It is a schematic diagram of an end cover in a lightweight shafting of a fan main shaft based on forced lubrication without an oil pump according to the present invention.

[0036] In the figure, 1 is the main shaft of the fan; 11 is the shaft shoulder; 2 is the shaft hub; 21 is the thrust bearing groove; 22 is the weight reduction hole; 23 is the radial oil hole; 24 is the axial oil hole; 3 is the radial sliding bearing; 31 is the dovetail; 32 is the oil distribution groove; 4 is the axial thrust bearing; 41 is the oil outlet hole of the thrust bearing; 42 is the hollow plug; 5 is the oil supply tank; 51 is the oil injection hole; 52 is the gravity plug; 53 is the connecting plate; 54 is the counterweight; 6 is the bearing seat; 7 is the end cover; 71 is the oil filling port; 8 is the seal. Specific embodiments

[0037] The following will combine the attached Figures 1 - 10 , and clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0038] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0039] As Figure 1 , Figure 2 shown, a lightweight shafting for a fan main shaft based on forced lubrication without an oil pump includes a fan main shaft 1, a shaft hub 2, a radial sliding bearing 3, an oil supply tank 5, and a bearing seat 6. As Figure 3 shown, a shaft shoulder 11 is provided on the fan main shaft 1, and the shaft hub 2 is installed on one side of the shaft shoulder 11. The shaft shoulder 11 limits one end of the shaft hub 2, and the shaft hub 2 is in interference fit with the fan main shaft 1; As Figure 4 , Figure 5 shown, the cross-section of the shaft hub 2 is an "I" - shaped structure. The inner ring of the shaft hub 2 is in interference fit with the fan main shaft 1, and several radial sliding bearings 3 are installed on the outer ring of the shaft hub 2. The design of the shaft hub 2 with an "I" - shaped structure realizes the lightweight of the fan main shaft 1 while ensuring sufficient strength through reasonable structural design, effectively coping with the deflection and bending stress of the fan main shaft 1 under abnormal working conditions, and improving the overall stability and safety of the equipment.

[0040] As Figure 2 shown, several oil supply tanks 5 are installed on both sides inside the shaft hub 2. As Figure 8As shown, a through fuel injection hole 51 is provided on the fuel supply tank 5, as Figure 5 As shown, a number of radial oil holes 23 are provided on the outer ring of the shaft hub 2. One end of the radial oil hole 23 communicates with the fuel supply tank 5, and the other end of the radial oil hole 23 leads to the radial sliding bearing 3. The built-in fuel supply tank 5 realizes direct oil supply to the radial sliding bearing 3 without an external oil pump, simplifies the lubrication system, and reduces energy consumption and maintenance costs.

[0041] A bearing housing 6 is provided outside the radial sliding bearing 3. An oil storage cavity is provided at the bottom of the bearing housing 6. A number of rib plates are provided inside the oil storage cavity to ensure the strength of the bottom of the bearing housing 6, and a circulation gap is provided between both ends of the rib plate and the oil storage cavity to ensure the circulation of the lubricating oil in the oil storage cavity. A number of circulation holes are provided in the bearing housing 6, and the bottom of the shaft hub 2 is immersed in the lubricating oil in the oil storage cavity. The design of the oil storage cavity at the bottom of the bearing housing 6 not only provides a continuous lubricating oil source for the bottom of the shaft hub 2, but also further enhances the lubrication effect through the immersion lubrication at the bottom of the shaft hub 2. During the operation of the fan, the radial sliding bearing 3 at the bottom of the bearing housing 6 is subjected to the greatest force (simultaneously subjected to the gravity and friction of the fan main shaft). By adopting the form of lubricating oil immersion, the lubrication effect of the bottom radial sliding bearing 3 is ensured. In addition, as the shaft hub 2 rotates, when the fuel supply tank 5 rotates to the bottom of the bearing housing 6, lubricating oil is replenished into the fuel supply tank 5 through the fuel injection hole 51. The lubricating oil in the fuel supply tank 5 flows through the radial oil hole 23 to the mating surface of the shaft hub 2 and the radial sliding bearing 3 under the action of gravity and centrifugal force, and forms an oil film on this mating surface, realizing forced lubrication of the shafting assembly without a high-pressure oil pump assembly.

[0042] As Figure 1 As shown, an end cover 7 is provided on one side of the bearing housing 6, as Figure 10 As shown, a fuel filling port 71 is provided on one side of the end cover 7. Sealing members 8 are provided on the contact surface between the end cover 7 and the bearing housing 6, the contact surface between the end cover 7 and the fan main shaft 1, and the contact surface between the bearing housing 6 and the fan main shaft 1. The sealing member 8 adopts a structure well-known to those skilled in the art, including an oil seal, a labyrinth seal, or a combination of the two.

[0043] As Figure 5 As shown, a number of thrust bearing grooves 21 are provided on both sides of the shaft hub 2. Axial thrust bearings 4 are provided in the thrust bearing grooves 21. During the operation of the fan, especially when encountering strong winds or sudden changes in wind speed and other working conditions, the fan main shaft 1 may be subjected to a large axial force. The axial thrust bearings 4 can effectively absorb and disperse these forces, help to suppress axial movement, and improve the overall operation stability and reliability of the fan.

[0044] As Figure 5 As shown, a number of axial oil holes 24 are provided inside the thrust bearing groove 21, as Figure 7As shown, a number of thrust bearing oil outlet holes 41 are provided on the axial thrust bearing 4. The thrust bearing oil outlet holes 41 correspond to the axial oil holes 24. A hollow plug 42 is connected to the thrust bearing oil outlet holes 41 by internal threads, and the other end of the hollow plug 42 is threadedly connected to the axial oil hole 24. The lubricating oil in the oil supply tank 5 flows through the axial oil hole 24 to the mating surface of the axial thrust bearing 4 and the bearing housing 6 or the end cover 7, and an oil film is formed on the mating surface, effectively reducing the wear of the axial thrust bearing 4, the bearing housing 6 or the end cover 7, and reducing the noise during the operation of the fan main shaft 1.

[0045] A number of dovetail grooves are provided on the inner wall of the bearing housing 6. As Figure 6 shown, a dovetail 31 is provided on one side of the radial sliding bearing 3. The dovetail 31 of the radial sliding bearing 3 is slidably installed in the dovetail groove, which not only facilitates the disassembly, installation and maintenance of the radial sliding bearing 3, enables the radial sliding bearing 3 to be replaced in the air, reduces the maintenance cost of the shafting, but also reduces the errors and fault risks that may occur during the disassembly and reinstallation process. At the same time, it effectively avoids the radial sliding bearing 3 rotating together with the fan main shaft 1 when the fan main shaft 1 rotates, reduces the vibration and noise caused by the bearing wobbling, and improves the overall operation stability of the fan.

[0046] As Figure 6 shown, a number of oil distribution grooves 32 arranged vertically and horizontally are provided on the radial sliding bearing 3. One end of the radial oil hole 23 is communicated with the oil distribution groove 32. The oil distribution groove 32 ensures an adequate amount of lubricating oil on the bearing surface of the radial sliding bearing 3 and enhances the formation of the oil film. It effectively isolates the direct contact between the radial sliding bearing 3 and the shaft hub 2, reduces friction and wear, and at the same time reduces the noise and vibration during the operation of the fan. In addition, the oil film also enhances the bearing capacity and service life of the radial sliding bearing 3.

[0047] As Figure 8 shown, a connecting plate 53 is hinged inside the oil supply tank 5. One end of the connecting plate 53 is a free end, and a gravity plug 52 is connected to one end of the connecting plate 53. The gravity plug 52 corresponds to the oil filling hole 51. As Figure 9 shown, when the oil supply tank 5 rotates clockwise with the shaft hub 2, the gravity plug 52 at the lowest end is in a state of being separated from the oil filling hole 51 under the action of gravity. When the oil supply tank 5 continues to rotate, the gravity plug 52 gradually blocks the oil filling hole 51, avoiding the leakage of the lubricating oil in the oil supply tank 5 from the oil filling hole 51 and ensuring the lubrication effect of the radial sliding bearing 3 and the axial thrust bearing 4 on the upper half of the shaft hub 2. When the oil filling hole 51 of the oil supply tank 5 continues to rotate to the vertical state, the gravity plug 52 is separated from the oil filling hole 51 under the action of gravity. When the oil filling hole 51 rotates below the liquid level of the lubricating oil in the oil storage chamber, the oil supply tank 5 is replenished with oil again. Repeating the above actions ensures the lubrication effect of the radial sliding bearing 3 and the axial thrust bearing 4.

[0048] As Figure 8 shown, one end of the connecting plate 53 is provided with a counterweight 54, and the gravity plug 52 is arranged at the lower end of the counterweight 54. The design of the counterweight 54 not only ensures the sealing effect of the oil injection hole 51, but also ensures that when the oil injection hole 51 rotates to the vertical state, the gravity plug 52 quickly separates from the oil injection hole 51, ensuring the oil replenishment effect for the fuel tank 5.

[0049] As Figure 8 shown, the gravity plug 52 is of a frustum-shaped structure, and the side of the oil injection hole 51 inside the fuel tank 5 adopts a funnel shape adapted to the shape of the gravity plug 52, which not only ensures the sealing effect between the gravity plug 52 and the oil injection hole 51, but also ensures the quick separation between the gravity plug 52 and the oil injection hole 51.

[0050] As Figure 5 shown, a number of weight reduction holes 22 are provided on the shaft hub 2, which further reduces the weight of the shafting assembly, improves the dynamic response performance of the shafting, helps to reduce the inertial force required to be overcome during the rotation of the fan, and reduces energy consumption.

[0051] The fan main shaft 1 and the shaft hub 2 are made of the same alloy steel material, and the bearing seat 6 and the steel back of the radial sliding bearing are made of the same alloy steel material, such as QT400 or QT500, which is beneficial to reducing friction and wear caused by material differences. Moreover, a coating is provided on the mating surface between the radial sliding bearing and the shaft hub, and the coating adopts existing materials, such as a compound of a polymer and molybdenum disulfide, so that the fan main shaft 1 and the radial sliding bearing 3 can maintain a low wear rate and stable performance even under the conditions of low speed and heavy load and frequent start and stop.

[0052] The above content is only an example and description of the structure of the present invention. Those skilled in the art of the present technology make various modifications or supplements or use similar ways to replace the specific embodiments described, as long as they do not deviate from the scope defined by the structure of the invention, they should fall within the protection scope of the present invention.

Claims

1. A lightweight shafting for a fan main shaft based on forced lubrication without an oil pump, comprising a fan main shaft, a shaft hub, a radial sliding bearing, an oil supply tank and a bearing housing. There is a shaft shoulder on the fan main shaft, and it is characterized in that, The shaft hub is installed on one side of the shaft shoulder, and the shaft hub is in interference fit with the main shaft of the fan; the cross-section of the shaft hub is an "I"-shaped structure, the inner ring of the shaft hub is in interference fit with the main shaft of the fan, and a number of radial sliding bearings are installed on the outer ring of the shaft hub; a number of the oil supply tanks are installed on both sides inside the shaft hub, the oil supply tanks are provided with through oil injection holes, a number of radial oil holes are provided on the outer ring of the shaft hub, one end of the radial oil hole is communicated with the oil supply tank, and the other end of the radial oil hole leads to the radial sliding bearing; a bearing seat is arranged outside the radial sliding bearing, and an oil storage cavity is arranged at the bottom of the bearing seat; a number of rib plates are arranged inside the oil storage cavity; a number of flow holes are arranged inside the bearing seat, and the bottom of the shaft hub is immersed in the lubricating oil in the oil storage cavity; an end cover is arranged on one side of the bearing seat, an oil filling port is arranged on one side of the end cover, and sealing elements are arranged on the contact surface between the end cover and the bearing seat, the contact surface between the end cover and the main shaft of the fan, and the contact surface between the bearing seat and the main shaft of the fan. The sealing elements include oil seals, labyrinth seals or a combination of both; a connecting plate is hinged inside the oil supply tank, one end of the connecting plate is a free end, and a gravity plug is connected to one end of the connecting plate, and the gravity plug corresponds to the position of the oil injection hole; when the oil supply tank rotates clockwise with the shaft hub, the gravity plug at the lowest end is in a state of being separated from the oil injection hole under the action of gravity, and when the oil supply tank continues to rotate, the gravity plug gradually blocks the oil injection hole.

2. A lightweight shafting for a fan main shaft with forced lubrication without an oil pump according to claim 1, characterized in that, A number of thrust bearing grooves are arranged on both sides of the shaft hub, and axial thrust bearings are arranged in the thrust bearing grooves.

3. The lightweight shafting of the main shaft of a forced lubrication fan without an oil pump according to claim 2, characterized in that, A number of axial oil holes are arranged inside the thrust bearing grooves, a number of thrust bearing oil outlet holes are arranged on the axial thrust bearings, the thrust bearing oil outlet holes correspond to the axial oil holes, and a hollow plug is threadedly connected inside the thrust bearing oil outlet holes, and the other end of the hollow plug is threadedly connected to the axial oil hole.

4. A lightweight shafting for a forced lubrication fan spindle without an oil pump according to claim 1, characterized in that, A number of dovetail grooves are arranged on the inner wall of the bearing seat, a dovetail is arranged on one side of the radial sliding bearing, and the dovetail of the radial sliding bearing is slidably installed in the dovetail groove.

5. A lightweight shafting for a blower main spindle based on forced lubrication without an oil pump according to claim 1, characterized in that, A number of oil distribution grooves arranged in a criss-cross manner are arranged on the radial sliding bearing, and one end of the radial oil hole is communicated with the oil distribution groove.

6. A lightweight shafting for a forced lubrication fan spindle without an oil pump according to claim 1, characterized in that, A counterweight block is arranged at one end of the connecting plate, and the gravity plug is arranged at the lower end of the counterweight block.

7. The lightweight shafting of the forced lubrication fan main shaft based on an oil-free pump according to claim 6, characterized in that The gravity plug is of a frustum-shaped structure, and the side of the oil injection hole located inside the oil supply tank is funnel-shaped and adapted to the shape of the gravity plug.

8. A lightweight shafting for a forced lubrication fan spindle without an oil pump according to claim 1, characterized in that, A number of weight-reducing holes are arranged on the shaft hub.

9. A lightweight shafting for a forced lubrication fan spindle without an oil pump according to claim 1, characterized in that, The main shaft of the fan and the shaft hub are made of the same alloy steel material, the bearing seat and the steel back of the radial sliding bearing are made of the same alloy steel material, and a coating is arranged on the mating surface between the radial sliding bearing and the shaft hub.

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