Main shaft bearing assembly and wind turbine

Abstract

The utility model provides a kind of main shaft bearing assembly and wind driven generator, it includes bearing body, end cover and sealing ring, sealing ring is used to seal the gap between bearing body and end cover, sealing ring includes the first ring part and the second ring part connected, first ring part is set in the first side surface of end cover, the second ring part is set between bearing body and end cover, main shaft bearing assembly further includes pressing plate part and fastener, one part of pressing plate part is connected to the first side surface of end cover, another part of pressing plate part covers first ring part, the surface of pressing plate part has the mounting hole connected with fastener, the end of fastener is abutted on first ring part;Wherein, along the axial direction of main shaft bearing assembly, pressing plate part and fastener respectively first ring part is pressed to first side surface.The scheme is by making sealing ring divide into first ring part and second ring part, to separate fixed and sealing function.The structure improves sealing stability, avoids compacting force damage sealing part, prolongs service life, enhances sealing performance.

Description

Technical Field

[0001] This utility model relates to the field of bearing technology, and in particular to a main shaft bearing assembly and a wind turbine generator. Background Technology

[0002] In recent years, with continuous breakthroughs in wind turbine technology, various main shaft bearing sealing structures have emerged. Although they exhibit diverse characteristics in form and design, their fundamental purpose remains to enhance the protection of the main shaft bearing, thereby ensuring its long-term stable operation and extending its service life. Conventional packing seal devices use bolts to press a sealing plate against the outer surface of the packing seal. The sealing plate then fixes the packing seal in the gap between the sealing plate and the end cap, thus achieving the fixing operation of the packing seal.

[0003] Chinese patent document CN103195820A discloses a sealing device for a wind turbine main shaft bearing and its manufacturing method. It uses bolts to penetrate the oil seal and insert into the outer sealing ring to press the oil seal against the surface of the outer sealing ring, thus achieving the purpose of securing the oil seal. However, because the oil seal is made of an elastic material, it is prone to deformation when pressed by bolts, leading to seal failure. Furthermore, Chinese patent document CN106402166B discloses a double-lip seal structure for a double-row spherical roller bearing and a wind turbine. It uses a pressure plate surface to contact the sealing ring and press the sealing ring into the gap between the pressure plate and the bearing end cover to complete the installation of the sealing ring. However, this installation method results in low back pressure on the sealing ring structure, insufficient sealing performance for grease lubrication, and the sealing ring structure is complex and has high production costs. Utility Model Content

[0004] The technical problem to be solved by this utility model is that the existing technology has defects such as bolts penetrating to fix the sealing ring causing deformation of the sealing ring, and the sealing ring is prone to displacement when it is only fixed by pressing the sealing ring with a pressure plate, resulting in poor sealing effect. The present invention provides a main shaft bearing assembly and a wind turbine generator.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] A spindle bearing assembly includes a bearing body, an end cap, and a sealing ring. The sealing ring seals the gap between the bearing body and the end cap. The sealing ring includes a first ring portion and a second ring portion connected together. The first ring portion is disposed on a first side surface of the end cap, and the second ring portion is disposed between the bearing body and the end cap. The spindle bearing assembly further includes a pressure plate portion and a fastener. A portion of the pressure plate portion is connected to the first side surface of the end cap, and another portion of the pressure plate portion covers the first ring portion. The surface of the pressure plate portion has a mounting hole for connecting the fastener, and the end of the fastener abuts against the first ring portion. Along the axial direction of the spindle bearing assembly, the pressure plate portion and the fastener respectively press the first ring portion onto the first side surface.

[0007] In this design, by positioning the pressure plate on the outer ring side of the sealing ring and away from the main shaft bearing, it is placed close to the sealing ring, thereby applying a holding force towards the axis of the main shaft bearing to the sealing ring. The pressure plate has a mounting portion for fasteners, allowing the fasteners to pass through and provide stable compression to the sealing ring. Furthermore, by separating the sealing ring into a first ring and a second ring, its fixing and sealing functions are separated. This structure not only helps improve the stability of the seal but also prevents structural damage to the sealing part caused by the fastener clamping force, thus significantly extending the service life of the sealing ring, enhancing overall sealing performance, and effectively reducing the maintenance requirements of the components.

[0008] Preferably, there is a gap between the edge of the sealing ring and the pressure plate portion along the radial direction of the main shaft bearing assembly.

[0009] Preferably, the pressure plate portion contacts the end cover along the axial direction of the main shaft bearing assembly.

[0010] In this design, by ensuring that the edge of the sealing ring does not contact the pressure plate along the radial direction of the spindle bearing assembly, space is reserved for the sealing ring to deform in the radial direction away from the spindle bearing. This also allows the spindle bearing assembly to accommodate sealing rings of different sizes and models. By ensuring that the pressure plate contacts the end cover along the axial direction of the spindle bearing assembly, the pressure plate can be more stably fixed to the end cover, thereby more firmly connecting with other parts of the spindle bearing assembly and improving structural stability.

[0011] Preferably, the second ring portion is a Y-shaped sealing structure, and the sealing ring further includes a spring member. The elastic direction of the spring member is arranged radially along the main shaft bearing assembly and is disposed in the Y-shaped groove of the second ring portion. The elastic direction of the spring member is outward along both ends of the Y-shaped groove.

[0012] In this design, the Y-shaped groove is combined with the arrangement of the spring components to ensure a tight fit between the groove shape and the spring's outline. The elastic direction of the spring is oriented outwards from both ends of the Y-shaped groove, aligning with the radial cross-sectional direction of the sealing ring. With the support of the spring, the second ring achieves superior sealing performance.

[0013] Preferably, the second ring portion includes a first lip and a second lip, the first lip contacting the end cap, the second lip contacting the bearing body, the Y-shaped groove being formed between the first lip and the second lip, the first lip being located on the radial side of the groove away from the spindle bearing assembly, the second lip being located on the radial side of the groove close to the spindle bearing assembly, and the second lip being interference-fitted with the surface of the bearing body.

[0014] In this design, the second lip and the bearing body surface are press-fitted together to ensure a tight fit between the second ring and the bearing surface, forming a uniform and consistently stable clamping force. This structural design effectively enhances the contact strength of the sealing interface, accommodating radial runout and axial displacement of the bearing during operation and preventing seal failure due to gaps. It achieves a complete circumferential seal on the bearing surface, significantly improving the system's oil leakage prevention performance, extending bearing life, and reducing maintenance requirements.

[0015] Preferably, the contact area between the second lip and the bearing body is coated with a lubricant.

[0016] In this design, lubricant is applied to the position where the second lip contacts the bearing body to reduce the wear of the seal ring.

[0017] Preferably, the spindle bearing assembly further includes a fixing part, which passes through the pressure plate part and is threadedly connected to the first side; along the axial direction of the spindle bearing assembly, the fixing part presses the pressure plate part onto the first side, so that the pressure plate part is connected to the first side.

[0018] Preferably, the fastener is a screw, the mounting hole is a threaded hole corresponding to the screw, and the mounting hole passes through the pressure plate portion.

[0019] Preferably, the first ring portion includes a first protrusion, which is disposed on the side of the first ring portion facing the end cap and in contact with the surface of the end cap. The surface of the first protrusion is coated with sealant.

[0020] Preferably, the second ring portion includes a second protrusion, which is disposed on the side of the second ring portion near the end cap and contacts the surface of the end cap. The surface of the second protrusion is interference-fitted with the surface of the end cap.

[0021] In this solution, by applying sealant to the position where the first protrusion contacts the end cap and to the position where the second protrusion contacts the end cap surface, lubricating oil leakage from the positions where the first protrusion, the second protrusion, and the end cap contact each other can be effectively prevented.

[0022] Preferably, the first ring portion is a fabric-reinforced skeleton, and the second ring portion is an elastic seal.

[0023] In this design, the first ring is made of a fabric-reinforced skeleton material, which possesses excellent mechanical strength and morphological stability. When fasteners apply clamping force, the fabric-reinforced skeleton, with its high hardness and structural rigidity, effectively resists deformation and displacement, thus ensuring that the overall structure maintains its original shape and positional stability under pressure. This design not only enhances the overall load-bearing capacity of the component but also effectively avoids excessive compression or shape alteration of the elastic seal in the second ring, significantly reducing the risk of sealing performance degradation due to uneven stress distribution. Therefore, this structure can continuously provide reliable sealing effects during long-term use, while also helping to extend the service life of sealing elements, reducing the frequency of equipment downtime, replacement, and maintenance caused by seal failure, and improving the overall economy and operational reliability of the system.

[0024] A wind turbine generator includes a main shaft bearing assembly as described above.

[0025] The positive and progressive effects of this utility model are as follows:

[0026] By positioning the pressure plate on the outer ring side of the sealing ring and away from the main shaft bearing, it is placed close to the sealing ring, thereby applying a holding force towards the axis of the main shaft bearing to the sealing ring. The pressure plate has a mounting portion for fasteners, allowing fasteners to pass through it and provide stable compression to the sealing ring. Furthermore, by separating the sealing ring into a first ring and a second ring, its fixing and sealing functions are separated. This structure not only helps improve the stability of the seal but also prevents structural damage to the sealing part caused by fastener clamping force, thus significantly extending the service life of the sealing ring, enhancing overall sealing performance, and effectively reducing the maintenance requirements of the components. Attached Figure Description

[0027] Figure 1 This is a cross-sectional schematic diagram of the spindle bearing assembly according to a preferred embodiment of the present invention.

[0028] Figure 2 This is a cross-sectional schematic diagram of a sealing ring according to a preferred embodiment of the present invention.

[0029] Explanation of reference numerals in the attached figures

[0030] Spindle bearing assembly 001

[0031] Bearing body 1

[0032] End cap 2

[0033] First side view 21

[0034] Sealing ring 3

[0035] First circle, section 31

[0036] First protrusion 311

[0037] Second circle, section 32

[0038] Spring component 321

[0039] First lip 322

[0040] Second lip opening 323

[0041] 324 slot

[0042] Second protrusion 325

[0043] Pressure plate section 4

[0044] Mounting hole 41

[0045] Fastener 5

[0046] Fixing part 6 Detailed Implementation

[0047] The present invention will be described more clearly and completely below with reference to the accompanying drawings, using a preferred embodiment.

[0048] like Figures 1-2 As shown, this embodiment provides a spindle bearing assembly 001, which includes a bearing body 1, an end cover 2, and a sealing ring 3. The sealing ring 3 is used to seal the gap between the bearing body 1 and the end cover 2. The sealing ring 3 includes a first ring portion 31 and a second ring portion 32 connected together. The first ring portion 31 is disposed on the first side surface 21 of the end cover 2, and the second ring portion 32 is disposed between the bearing body 1 and the end cover 2. The spindle bearing assembly 001 also includes a pressure plate portion 4 and a fastener 5. One part of the pressure plate portion 4 is connected to the first side surface 21 of the end cover 2, and the other part of the pressure plate portion 4 covers the first ring portion 31. The surface of the pressure plate portion 4 has a mounting hole 41 for connecting the fastener 5, and the end of the fastener 5 abuts against the first ring portion 31.

[0049] Along the axial direction of the main shaft bearing assembly 001, the pressure plate 4 and the fastener 5 press the first ring 31 onto the first side surface 21.

[0050] By arranging the pressure plate 4 on the outer ring side of the sealing ring 3 and away from the bearing body 1, so that it is close to the sealing ring 3, a holding force pointing towards the axis of the bearing body 1 can be applied to the sealing ring 3. The structure is simple, and the pressure plate is detachable; removing the pressure plate allows direct access to the sealing ring, facilitating direct inspection of the sealing ring's condition and optimizing the accessibility of maintenance checks. The pressure plate 4 has a mounting part for mounting fasteners 5, allowing the fasteners 5 to pass through the pressure plate 4 and achieve a stable clamping effect on the sealing ring 3. The double clamping measures—pressing the sealing ring 3 with the pressure plate 4 and pressing it against the surface of the end cover 2 with the fasteners 5—prevent the sealing ring 3 from rotating during bearing operation, ensuring that the sealing ring 3 maintains a good sealing effect. Furthermore, by dividing the sealing ring 3 into a first ring 31 and a second ring 32, the fixing function and the sealing function are separated. This design not only improves the stability of the sealing state, but also effectively avoids structural damage to the sealing part caused by the tightening force of fastener 5, thereby significantly extending the service life of sealing ring 3, enhancing the overall sealing performance, and reducing maintenance requirements.

[0051] In this embodiment, the first ring 31 is a fabric-reinforced skeleton, and the second ring 32 is an elastic seal. They are made of different materials to meet the fixing requirements of the first ring 31 and the sealing requirements of the second ring 32, respectively. The first ring 31 and the second ring 32, made of different materials, are fixedly connected using existing processes such as adhesive bonding. Specifically, to ensure a good seal, the material of the second ring 32 is nitrile rubber. To ensure reliable fixing, the first ring 31 is made of a fabric-reinforced skeleton material, which possesses excellent mechanical strength and morphological stability. When the fastener 5 applies a clamping force, the fabric-reinforced skeleton, with its high hardness and structural rigidity, can effectively resist deformation and displacement, ensuring that the overall structure maintains its original shape and positional stability under pressure. This design not only improves the overall load-bearing capacity of the component but also avoids excessive compression or deformation of the elastic seal of the second ring 32, significantly reducing the risk of decreased sealing performance due to uneven stress distribution. Therefore, this structure can provide a reliable sealing effect during long-term operation, which helps to extend the service life of sealing elements, reduce the frequency of equipment downtime, replacement and maintenance due to seal failure, and thus improve the economy and operational reliability of the entire system.

[0052] In other embodiments, the material of the first ring portion 31 may also be other materials such as metals or engineering plastics that are resistant to high pressure, high temperature and wear, and the material of the second ring portion 32 may also be materials such as fluororubber, hydrogenated nitrile rubber and acrylate rubber that have good oil resistance, wear resistance and sealing performance, which will not be described in detail here.

[0053] like Figures 1-2 As shown, in this embodiment, along the axial direction of the spindle bearing assembly 001 (see...) Figure 1(Arrow A points to) The pressure plate 4 contacts the end cover 2. Along the radial direction near the main shaft bearing, a portion of the end of the pressure plate 4 does not contact the end cover 2. The end of the pressure plate 4 is concave in the axial direction away from the main shaft bearing, creating a height difference with the other parts of the pressure plate 4. This results in a gap between the end of the pressure plate 4 and the first side 21 of the end cover 2, which is used to accommodate the sealing ring 3. A portion of the gap for mounting the first ring portion 31 of the sealing ring 3 is along the axial direction of the main shaft bearing. The dimensions correspond to the dimensions of the first ring portion 31. The pressure plate portion 4 and the end cover 2 fit together to limit the first ring portion 31, providing a fixing force for the sealing ring 3. The spindle bearing assembly 001 also includes a fixing portion 6, which passes through the pressure plate portion 4 and is threaded to the first side surface 21. The fixing portion 6 is located at the end of the pressure plate portion 4 away from the spindle bearing in the radial direction. Along the axial direction of the spindle bearing assembly 001, the fixing portion 6 presses the pressure plate portion 4 against the first side surface 21, so that the pressure plate portion 4 is connected to the first side surface 21. Along the radial direction of the spindle bearing assembly 001 (see...) Figure 1 (Arrow B points to) There is a gap between the edge of the sealing ring 3 and the pressure plate 4. Specifically, in this design, there is a gap between the first ring 31 and the pressure plate 4 in the radial direction away from the main spindle bearing. By ensuring that the edge of the sealing ring 3 does not contact the pressure plate 4 in the radial direction along the main spindle bearing assembly 001, space is reserved for the sealing ring 3 to deform in the radial direction away from the main spindle bearing. This also allows the main spindle bearing assembly 001 to accommodate sealing rings 3 of different sizes and models. By ensuring that the pressure plate 4 contacts the end cover 2 in the axial direction along the main spindle bearing assembly 001, the pressure plate 4 can be more stably fixed on the end cover 2, thereby more firmly connecting with other parts of the main spindle bearing assembly 001 and improving structural stability.

[0054] In other embodiments, the first ring portion 31 may have a gap with the end cover 2 in the radial direction away from the main shaft bearing, or the pressure plate portion 4 may not contact the end cover 2, that is, there is no contact relationship between the pressure plate portion 4 and the first side 21 of the end cover 2. The pressure plate portion 4 is fixed to the end cover 2 without contact by means such as bolts or screws, or other structures are provided between the pressure plate portion 4 and the end cover 2 to meet the bearing assembly requirements. There are no other structural parts in the extended space corresponding to the end of the first ring portion 31 in the radial direction away from the main shaft bearing. In addition, the first ring portion 31 may not contact the end cover 2 or the pressure plate portion 4, but may contact the end cover 2 or the pressure plate portion 4 through other structures such as buffers, and be limited and fixed by them. The fixing part 6 may also be other forms of connecting parts such as expansion bolts. The specific structural setting scheme can refer to the prior art, and will not be described in detail here.

[0055] like Figures 1-2As shown, in this embodiment, the first ring portion 31 is a ring plate structure with a rectangular axial cross section. The first ring portion 31 is fixed to the first side 21 of the end cover 2 by fasteners 5, which are screws. The pressure plate portion 4 is provided with mounting holes 41 corresponding to the installation position of the first ring portion 31. The mounting holes 41 are threaded holes corresponding to the screws. The second ring portion 32 is a Y-shaped sealing structure. The sealing ring 3 also includes a spring member 321. The elastic direction of the spring member 321 is along the radial direction of the main shaft bearing assembly 001 (see...). Figure 1(Arrow B points) and is arranged within the Y-shaped groove 324 of the second ring 32. The elastic direction of the spring 321 extends outwards along both ends of the Y-shaped groove 324. The spring 321 is a leaf spring bent into a trumpet shape and adapted to the Y-shaped groove 324. After bending, the leaf spring has good sealing and compensation capacity, and can still effectively prevent oil leakage when the bearing body 1 undergoes radial changes. The design of the Y-shaped groove 324 matches the layout of the spring 321, so that the shape of the groove 324 fits tightly with the outer contour of the spring 321. The elastic direction of the spring 321 extends outwards along both ends of the Y-shaped groove 324, which is consistent with the radial cross-sectional direction of the opening of the sealing ring 3. With the support of the spring 321, the second ring 32 can achieve better sealing performance. The second ring portion 32 includes a first lip 322 and a second lip 323. The first lip 322 contacts the end cap 2, and the second lip 323 contacts the bearing body 1. A Y-shaped groove 324 is formed between the first lip 322 and the second lip 323. The first lip 322 is located on the radial side of the groove 324 away from the main spindle bearing assembly 001, and the second lip 323 is located on the radial side of the groove 324 close to the main spindle bearing assembly 001. The second lip 323 is press-fitted with the surface of the bearing body 1. In the relaxed state, the distance between the radial end of the second ring portion 32 away from the main spindle bearing and the radial end of the second ring portion 32 close to the main spindle bearing is greater than the distance between the surface of the end cap 2 and the surface of the main spindle bearing in the radial direction in the space where the second ring portion 32 is placed. Lubricant is applied to the contact area between the second lip 323 and the bearing body 1 to increase the wear resistance of the second lip 323 and eliminate the noise generated by dry friction between the second lip 323 and the bearing body 1. The first ring portion 31 also includes a first protrusion 311, which is located on the side of the first ring portion 31 facing the end cap 2 and contacts the surface of the end cap 2. The first protrusion 311 contacts the first side surface 21 of the end cap 2, and there is an interference fit between the first protrusion 311 and the end cap 2. The surface of the first protrusion 311 is coated with sealant, specifically silicone sealant. The second ring portion 32 includes a second protrusion 325, which is located on the side of the second ring portion 32 near the end cap 2 and contacts the surface of the end cap 2. The surface of the second protrusion 325 is also in an interference fit with the surface of the end cap 2, effectively preventing thin oil from leaking from the contact surface between the first protrusion 311 and the end cap 2 and the contact surface between the second protrusion 325 and the end cap 2. In this embodiment, the sealing ring 3 adopts a fabric-reinforced skeleton + nitrile rubber oil seal + leaf spring, which has good back pressure and can maintain good sealing performance even when the sealing ring 3 is lubricated with grease and prone to leakage.

[0056] In other embodiments, the spring 321 can also be a bar spring or other types of springs. At the same time, the size of the slot 324 should also be adapted to the shape of the spring 321 to ensure that the second lip 323 and the main shaft bearing are interference fit, maintaining the sealing performance of the sealing ring 3. In addition, the end cap 2 portion corresponding to the first protrusion 311 and the second protrusion 325 is provided with a groove to accommodate the first protrusion 311 and the second protrusion 325. The size of the groove is adapted to or slightly smaller than the size of the first protrusion 311 and the second protrusion 325. The groove is coated with sealant, which will not be described in detail here.

[0057] This embodiment also provides a wind turbine generator, which includes the main shaft bearing assembly 001 as described above.

[0058] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A spindle bearing assembly comprising a bearing body, an end cover, and a sealing ring, wherein the sealing ring is used to seal the gap between the bearing body and the end cover, characterized in that, The sealing ring includes a first ring portion and a second ring portion connected together. The first ring portion is disposed on a first side of the end cover, and the second ring portion is disposed between the bearing body and the end cover. The spindle bearing assembly also includes a pressure plate portion and a fastener. A portion of the pressure plate portion is connected to the first side of the end cover, and another portion of the pressure plate portion covers the first ring portion. The surface of the pressure plate portion has a mounting hole for connecting the fastener, and the end of the fastener abuts against the first ring portion. Along the axial direction of the main shaft bearing assembly, the pressure plate and the fastener respectively press the first ring portion onto the first side surface.

2. The spindle bearing assembly as described in claim 1, characterized in that, Along the radial direction of the main shaft bearing assembly, there is a gap between the edge of the sealing ring and the pressure plate portion; And / or, along the axial direction of the spindle bearing assembly, the pressure plate portion contacts the end cover.

3. The spindle bearing assembly as described in claim 1, characterized in that, The second ring portion is a Y-shaped sealing structure. The sealing ring also includes a spring element. The elastic direction of the spring element is arranged radially along the main shaft bearing assembly and is disposed in the Y-shaped groove of the second ring portion. The elastic direction of the spring element is outward along both ends of the Y-shaped groove.

4. The spindle bearing assembly as described in claim 3, characterized in that, The second ring portion includes a first lip and a second lip. The first lip contacts the end cap, and the second lip contacts the bearing body. The Y-shaped groove is formed between the first lip and the second lip. The first lip is located on the radial side of the groove away from the spindle bearing assembly, and the second lip is located on the radial side of the groove close to the spindle bearing assembly. The second lip is interference-fitted with the surface of the bearing body.

5. The spindle bearing assembly as described in claim 4, characterized in that, The second lip is coated with lubricant at the contact point with the bearing body.

6. The spindle bearing assembly as described in claim 1, characterized in that, The main spindle bearing assembly also includes a fixing part, which passes through the pressure plate and is threadedly connected to the first side. Along the axial direction of the spindle bearing assembly, the fixing part presses the pressure plate part onto the first side side so that the pressure plate part is connected to the first side side.

7. The spindle bearing assembly as described in claim 1, characterized in that, The fastener is a screw, and the mounting hole is a threaded hole corresponding to the screw, which passes through the pressure plate.

8. The spindle bearing assembly as described in claim 1, characterized in that, The first ring portion includes a first protrusion, which is disposed on the side of the first ring portion facing the end cap and contacts the surface of the end cap. The surface of the first protrusion is coated with sealant. And / or, the second ring portion includes a second protrusion, the second protrusion being disposed on the side of the second ring portion near the end cap and in contact with the surface of the end cap, the surface of the second protrusion being in an interference fit with the surface of the end cap.

9. The spindle bearing assembly as described in claim 1, characterized in that, The first ring is a fabric-reinforced skeleton, and the second ring is an elastic seal.

10. A wind turbine generator, characterized in that, The wind turbine includes the main shaft bearing assembly as described in any one of claims 1-9.

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