CN210152841U - Sliding bearing for wind driven generator - Google Patents

Abstract

The utility model relates to a slidingtype bearing for aerogenerator, include: an outer ring configured to be connectable to or engageable with a hub or main bearing housing of a wind turbine, wherein the outer ring has a first sliding surface; an inner ring configured to be connectable to or engageable with a blade or a main shaft of a wind turbine, wherein the inner ring has a second sliding surface associated with the first sliding surface, wherein the outer ring and the inner ring are configured such that relative sliding between the first sliding surface and the second sliding surface allows the blade or the main shaft to rotate about a central axis of the inner ring or the outer ring; and one or more lubrication channels communicating the first sliding surface and/or the second sliding surface with the outside for adding lubricant to the first sliding surface and/or the second sliding surface from the outside. The utility model discloses can provide the face formula sliding friction contact between blade and the wheel hub and/or between wheel hub and the main shaft to show the contact stress that reduces the bearing and receive on unit area, improve the life-span of bearing from this.

Description

Sliding bearing for wind driven generator

Technical Field

The utility model relates to a wind power generation field generally, particularly to a slidingtype bearing for aerogenerator.

Background

The clean energy is a novel energy, and has the advantages of wide distribution, reproducibility, small environmental pollution and the like compared with the traditional fossil fuel. In view of the above advantages, clean energy technology has been rapidly developed in recent years. Wind power generators are increasingly used as representatives of clean energy.

Two important mechanical components of a wind turbine are the pitch bearing and the main bearing. The pitch bearing serves to connect the blade with the hub and allows adjustment of the pitch angle of the blade, while the main bearing serves to connect the main shaft of the hub with the main bearing housing of the tower and allows relative rotation between the main shaft and the main bearing housing. At present, a variable pitch bearing and a main bearing mainly adopt ball bearings or ball bearings. However, the ball bearing or the ball bearing is disadvantageous in that since the ball bearing is in point contact or line contact, the contact stress is large, and thus, in the manufacturing process thereof, a high-quality steel must be used in a precise process to ensure a satisfactory life of the bearing; furthermore, ball bearings must have good sealing properties, otherwise ingress of moisture or dirt will significantly affect bearing life. In addition, the two mechanical components, the pitch bearing and the main bearing, are subjected to large loads during the operation of the wind turbine, and the relative rotation generates continuous wear, so that the maintenance work of the pitch bearing and the main bearing may need to be performed frequently. In the case of ball bearings or ball bearings, the entire hub or blade must be disassembled and hoisted, which brings great difficulty and safety hazards to the maintenance work.

SUMMERY OF THE UTILITY MODEL

Starting from the prior art, the object of the present invention is to provide a sliding bearing for a wind turbine and a method for maintaining the same, by means of which a surface-type sliding frictional contact between the blade and the hub and/or between the hub and the main shaft can be provided, so that the contact stress on the bearing per unit area is significantly reduced, whereby the service life of the bearing is increased and the manufacturing requirements of the bearing are reduced.

According to the utility model discloses, this task is through a slidingtype bearing for aerogenerator, include:

an outer ring configured to be connectable to or engageable with a hub or main bearing housing of a wind turbine, wherein the outer ring has a first sliding surface;

an inner ring configured to be connectable to or engageable with a blade or a main shaft of a wind turbine, wherein the inner ring has a second sliding surface associated with the first sliding surface, wherein the outer ring and the inner ring are configured such that relative sliding between the first sliding surface and the second sliding surface allows the blade or the main shaft to rotate about a central axis of the inner ring or the outer ring; and

one or more lubrication channels communicating the first and/or second sliding surface with the outside for adding lubricant to the first and/or second sliding surface from the outside.

It should be noted here that in the present invention "bearing" covers not only discrete bearing parts, but also a rotary connection between two parts, i.e. the "bearing" can be constructed both as a discrete part and as an integral part or part of the mounting location. Furthermore, the term "outer ring" refers to a rotating component that is external with respect to the "inner ring". Generally, the outer ring has a cavity and the inner ring has a projection corresponding to the cavity, thereby enabling a rotational fit between the outer and inner rings.

In a preferred embodiment of the invention, it is provided that the outer ring and/or the inner ring have one or more detachable segments. By this preferred solution, partial removability of the bearing can be achieved, thereby significantly simplifying the bearing maintenance process. In this case, the outer ring and the inner ring are preferably each formed from a plurality of detachable segments, wherein the segments are connected to one another or to a fixed point by means of screws or other means. During maintenance, one or more segments can be removed without having to separate the blade from the hub or the hub from the main shaft, thereby eliminating this complete separation process as well as the lifting process. Instead, the entire maintenance work can be carried out outside the hub and inside the fairing, for example.

In a further preferred embodiment of the invention, it is provided that one or more friction disks are arranged on the first sliding surface and/or the second sliding surface. By this preferred solution, it is possible to provide the desired sliding frictional contact between the sliding surfaces by providing a corresponding number and material of friction plates, that is to say to adjust the frictional force of the sliding contact and to reduce the wear of the inner and outer rings themselves.

In a further preferred embodiment of the invention, it is provided that the friction lining is arranged on the second sliding surface. By this preferred solution, a sliding frictional contact can be formed between the friction plates of the outer ring and the inner ring, thereby facilitating a reliable and stable frictional rotation of the connecting blades or the inner ring of the main shaft, in particular avoiding an idle rotation of the main shaft or the blades. It should be noted, however, that it is also conceivable to arrange the friction plates on the first sliding surface, in which case a sliding frictional contact is formed between the friction plates of the inner ring and the outer ring.

In a further preferred embodiment of the invention, provision is made for a recess to be provided in the friction disk. The notch is for example X-shaped, S-shaped or O-shaped, spanning for example the entire surface of the notch. The notch 401 is arranged on the friction plate 110, so that noise can be reduced, the contact surface is reduced, and an oil storage effect is achieved.

In a further development of the invention, it is provided that the outer ring is integrally formed with or is part of a hub or a main bearing seat of the wind turbine; and/or

The inner ring is integrally formed with or is part of a blade or a main shaft of the wind turbine.

Through the expansion scheme, the integration of the sliding bearing and the installation position can be realized, and the installation cost of the sliding bearing can be reduced. It should be noted that in other cases the sliding bearing of the invention may also be a separate component.

In a further embodiment of the invention, it is provided that a plurality of through-holes are provided on the outer ring and/or the inner ring, wherein the through-holes can be used to connect the outer ring or the inner ring to the hub or the blades or to connect a plurality of detachable segments of the inner ring or the outer ring to one another using screws. By means of this development, a secure mounting of the inner ring and the outer ring and a fixing of the segments to one another can be achieved. In other embodiments, other attachment means, such as snap-fit connections, rivet connections, welding, etc., may be used.

In a further embodiment of the invention, it is provided that the friction lining has one or more of the following as a base material:

-Polybenzimidazole (PBI);

-a Polyimide (PI);

polyamideimide (PAI)

-Polyetheretherketone (PEEK);

-polyphenylene sulfide (PPS);

-polyphenylene sulfone resins (PPSU);

-Polysulfone (PSU);

-a Polyetherimide (PEI);

-polyvinylidene fluoride (PVDF);

-ethylene chlorotrifluoroethylene copolymer (ECTFE);

-soluble Polytetrafluoroethylene (PFA);

-Polytetrafluoroethylene (PTFE); and

polyethylene terephthalate (PET).

Through this extension scheme, can provide the better friction disc of basic wearability. Other materials can also be selected as the base material of the friction plate under the teaching of the utility model.

In a further embodiment of the invention, it is provided that the friction lining has one or more of the following as reinforcing material:

-graphite;

-carbon fibres; and

-glass fibers.

Through this extension scheme, can further improve the intensity or the wearability of friction disc. Other materials may also be selected as reinforcing materials for the friction disks under the teachings of the present invention.

In a preferred embodiment of the invention, it is provided that one or more of the friction linings are arranged on the first sliding surface and/or the second sliding surface in such a way that the friction lining is at an angle to the first sliding surface and/or the second sliding surface. Here, the friction plate is angled to the sliding surface means that the friction plate is oriented in a specific direction, or the surface of the friction plate is angled to the surface of the sliding surface. By means of this embodiment, individual frictional forces can be provided at different sliding points.

In a further preferred embodiment of the invention, it is provided that the friction linings are arranged symmetrically in the circumferential direction of the outer ring or the inner ring. With this preferable configuration, it is possible to provide uniform frictional force in the circumferential direction of the outer ring or the inner ring. The symmetrical arrangement may, for example, comprise the friction linings being arranged symmetrically in pairs with respect to the central axis or being distributed uniformly over the circumference or circumference of the inner or outer ring.

In a further preferred embodiment of the invention, it is provided that the friction lining is arranged in a circumferential recess of the inner ring or the outer ring. Through setting up the cave, can make the friction disc of arranging in the cave more firm to prevent that the friction disc from skidding or droing. The recess may be shaped to match the friction plate and the depth of the recess is less than the thickness of the friction plate such that a portion of the friction plate is exposed to provide friction.

In one embodiment of the invention, it is provided that the sliding bearing is used as a pitch bearing or a main bearing of the wind turbine. Through connecting the position different, the utility model discloses a slidingtype bearing can be used as sharp generator's change oar bearing or main bearing. When used as a pitch bearing, the sliding bearing connects the blade with the hub, and the sliding connection between the outer ring and the outer ring may allow the pitch angle of the blade to be adjusted; when used as a main bearing, the sliding bearing connects the main shaft of the hub with the main bearing housing of the tower, and the sliding connection between the outer race and the outer race may allow the main shaft to rotate relative to the main bearing housing.

The utility model discloses have following beneficial effect at least: (1) compared with a rolling bearing, the sliding type bearing of the utility model provides surface contact between an inner ring or a friction material and an outer ring in the operation process, so the contact stress on unit area is low, and the requirement of the surface contact on the precision of parts is not high, therefore, the sliding type bearing of the utility model does not need high-strength materials and high processing precision, thereby reducing the bearing cost; (2) for antifriction bearing, the sliding surface of the sliding bearing of the utility model has low requirement for lubrication, and does not need expensive sealing rings and lubrication systems like ball bearings; (3) for rolling bearings, the process is very expensive and dangerous, especially for future development trends of large megawatt offshore units, since the entire blade or main shaft, pitch bearing or main bearing needs to be hoisted for maintenance or replacement after damage; when the inner friction plate of the sliding bearing is damaged, only a part of detachable segments can be detached, and then the inner structure is maintained and replaced, so that the hoisting process is omitted; moreover, because the contact stress is small, generally speaking, the inner ring and the outer ring are not easy to damage, so the sliding type bearing has higher reliability and durability; especially in the case of an outer ring comprising detachable segments, the mounting of the outer ring (e.g. the hub) can be effected as little as possible during maintenance, so that neither the mounting of the outer ring (the hub) nor the attachment of the inner ring (e.g. the blades) has to be destroyed, and the detachment of the detachable segments of the outer ring can be carried out easily outside the bearing (and not inside the bearing or inside the blades); (4) in the present application, by configuring the inner ring for mounting a rotatable device (such as a blade or a main shaft), the rotatable device can be rotated without interference, because the surface of the inner ring is almost entirely used for sliding frictional contact as compared to the outer ring, and thus interference factors (such as undesired friction, pressure, dirt adhesion, etc.) associated with the exposed surface can be avoided to the greatest extent, thereby facilitating accurate angular adjustment or achieving more stable and reliable rotation of the rotatable device, such as a blade; (5) in the present application, by providing a lubrication passage for adding lubricant, the addition of lubricant can be easily achieved without having to disassemble or break the bearing; (6) the outer ring is connected with the hub through the bolt, so that the whole friction plate is not contacted with the hub, and the maintenance/replacement can be more conveniently carried out; (7) under the condition that the friction plate is placed in the recess with a specific height, the pressure-bearing capacity of the friction plate can be obviously improved, the deformation in the thickness direction is reduced, and the friction plate is fixed by the stop block, so that the cost is lower, and the replaceability is better; (8) under the condition that the surface of the friction plate is provided with X-shaped gaps, the noise can be reduced, the contact surface is reduced, and the oil storage function is realized.

Drawings

The invention will be further elucidated with reference to specific embodiments in conjunction with the drawing.

Figure 1 shows a first embodiment of a sliding bearing according to the invention;

figure 2 shows a second embodiment of a sliding bearing according to the invention;

figure 3 shows a flow of a method for maintaining a sliding bearing according to the invention; and

fig. 4 shows an embodiment of a friction plate of a sliding bearing according to the invention.

Detailed Description

It should be noted that the components in the figures may be exaggerated and not necessarily to scale for illustrative purposes. In the figures, identical or functionally identical components are provided with the same reference symbols.

In the present invention, "disposed on …", "disposed above …" and "disposed over …" do not exclude the presence of an intermediate therebetween, unless otherwise specified. Further, "disposed on or above …" merely indicates the relative positional relationship between two components, and may also be converted to "disposed below or below …" and vice versa in certain cases, such as after reversing the product direction.

In the present invention, the embodiments are only intended to illustrate the aspects of the present invention, and should not be construed as limiting.

In the present application, the terms "a" and "an" do not exclude the presence of a plurality of elements, unless otherwise indicated.

It is further noted herein that in embodiments of the present invention, only a portion of the components or assemblies may be shown for clarity and simplicity, but those skilled in the art will appreciate that the components or assemblies may be added as needed for specific scenarios, given the teachings of the present invention.

It is also to be noted that, within the scope of the present invention, the expressions "identical", "equal", etc., do not mean that the two values are absolutely equal, but allow a certain reasonable error, that is, the expressions also cover "substantially identical", "substantially equal".

Finally it should be noted that in the present invention "bearing" covers not only discrete bearing parts, but also a rotational connection between two parts, i.e. the "bearing" can be constructed either as a discrete part or as an integral part or part of the mounting location.

Fig. 1 shows a first embodiment of a sliding bearing 100 according to the invention.

In the first embodiment, the sliding bearing 100 is used as a pitch bearing of a wind turbine.

The slipper bearing 100 includes the following components, some of which are optional:

an outer ring 108 connected to the hub 104 of the wind turbine, wherein the outer ring 108 has a first sliding surface 111. Here, the outer ring 108 is formed by a plurality (e.g., 3 here) of detachable segments 105, 106, and 113, which detachable segments 105, 106, and 113 together enclose a space for accommodating the inner ring 102, wherein a portion of the inner surface of a portion of the detachable segments 105, 106, and 113 forms the sliding surface 111. In this embodiment, the outer ring 108 is connected with the hub 104 by bolts 109 and its detachable segments 105, 106 and 113 are connected with each other by bolts 109. For this purpose, through holes for bolt connections are formed in the outer ring 108 (see dashed lines in the outer ring 108). In other embodiments, other attachment means, such as snap-fit connections, rivet connections, welding, etc., may be used to attach the outer race 108 to the hub 104 and to attach the removable segments of the outer race 108 to one another. Further, the outer race 108 may also be integrally formed with the hub 104 or be a part of the hub 104.

An inner ring 102 connected to the blade 101 of the wind turbine, wherein the inner ring 102 has a second sliding surface 112 associated with the first sliding surface 111, wherein the outer ring 108 and the inner ring 102 are configured such that relative sliding between the first sliding surface 111 and the second sliding surface 111 allows the blade 101 to rotate about a central axis X of the inner or outer ring. Here, the central axis X of the outer ring 108 and the inner ring 102 refers to a straight line on which the central axis X of the inner ring 102 or the outer ring 108 is located. Here, the bulging portion of the inner race 102 projects into the outer race 108 and forms a second sliding surface 112 which can make sliding frictional contact with the first sliding surface 111. Here, the inner ring 102 is constructed of a single segment, but in other embodiments the inner ring 102 may be constructed of a plurality of detachable segments. In the present embodiment, the inner ring 102 is connected to the blades 101 by bolts 103. For this purpose, through holes for bolt connection are formed in the inner ring 102 (see the dashed lines in the inner ring 102). In other embodiments, other attachment means, such as snap connections, rivet connections, welding, etc., may be used to attach the inner ring 102 to the blades 101 and to attach the removable segments of the inner ring 102 to each other.

One or more lubrication channels 107, said lubrication channels 107 communicating the first sliding surface 111 and/or the second sliding surface 112 with the outside for adding lubricant from the outside to the first sliding surface 111 and/or the second sliding surface 112. The lubrication channel 107 is, for example, a channel that opens into the outer ring 108 or the inner ring 102 and opens out into the sliding surface. Since the sliding frictional contact of the present invention does not require a seal, the lubrication 107 passage does not substantially affect the operation and durability of the bearing. Instead, the lubrication channel 107 would greatly facilitate the addition of lubricant without having to disassemble the bearing 100.

An optional friction plate 110 arranged on the second sliding surface 112. It should be noted here that in other embodiments, it may also be arranged on the first sliding surface 111. By providing a corresponding number and material of friction plates 110, it is possible to provide a desired sliding frictional contact between the sliding surfaces 111, 112, that is, to adjust the frictional force of the sliding contact and to reduce the wear of the inner and outer rings 102, 108 themselves. By arranging the friction plate 110 on the second sliding surface 112, a sliding frictional contact can be formed between the outer ring 108 and the friction plate 110 of the inner ring 102, whereby a reliable and stable frictional rotation of the inner ring 102 connecting the vanes 101 is facilitated, and in particular, an idling of the vanes 101 can be avoided. It should be noted, however, that it is also conceivable to arrange the friction plate 110 on the first sliding surface 111, in which case a sliding frictional contact is formed between the inner ring 102 and the friction plate 110 of the outer ring 108. The friction plate 110 may have a base material and a reinforcing material, wherein the base material includes, for example, Polybenzimidazole (PBI), Polyimide (PI), Polyamideimide (PAI), Polyetheretherketone (PEEK), polyphenylene sulfide (PPS), polyphenylene sulfone resin (PPSU), Polysulfone (PSU), Polyetherimide (PEI), polyvinylidene fluoride (PVDF), ethylene chlorotrifluoroethylene copolymer (ECTFE), soluble Polytetrafluoroethylene (PFA), Polytetrafluoroethylene (PTFE), and polyethylene terephthalate (PET), and the base material may be used to provide the friction plate 110 having a good wear resistance; the reinforcing material includes graphite, carbon fiber and glass fiber, through adopting above-mentioned reinforcing material, can further improve the intensity or the wearability of friction disc 110 under the teaching of the utility model, can also select other materials as the base material or the reinforcing material of friction disc.

Fig. 2 shows a second embodiment of a sliding bearing 200 according to the invention.

Unlike the first embodiment, in the second embodiment, the sliding type bearing 100 is used as a main bearing of the wind power generator.

The slipper bearing 200 includes the following components, some of which are optional:

an outer ring 108 connected to, joined to, or part of the main bearing housing 204 of the wind turbine, in this embodiment, the outer ring 208 is part of the main bearing housing 204. The outer race 108 has a first sliding surface 111. Here, the outer ring 108 is formed by a plurality of (e.g., 2 here) detachable segments 105 and 106, which detachable segments 105, 106 together enclose a space for accommodating the inner ring 201, wherein a part of the inner surface of a part of the detachable segments 105, 106 forms the sliding surface 111. In this embodiment, the detachable segments 105, 106 of the outer ring 108 are connected to each other by means of a bolt 109 and a nut 114. For this purpose, through holes for bolt connections are formed in the outer ring 108 (see dashed lines in the outer ring 108). In other embodiments, other means of attachment may be used, such as snap-fit attachment, rivet attachment, welding, and the like.

An inner ring 202 connected to, engaged with, or part of the main shaft 201 of the wind turbine, and in the present embodiment, the inner ring 202 is part of the main shaft 201. Inner race 202 has a second sliding face 112 associated with first sliding face 111, wherein outer race 108 and inner race 202 are configured such that relative sliding between first sliding face 111 and second sliding face 111 allows blade 101 to rotate about a central axis X of inner race 202 or outer race 108. Here, the central axis X of the outer ring 108 and the inner ring 102 refers to a straight line on which the central axis or central axis of the inner ring 202 or the outer ring 108 is located. Here, the bulging portion of the inner race 202 projects into the outer race 108 and forms a second sliding surface 112 which can make sliding frictional contact with the first sliding surface 111. Here, the inner ring 202 is constructed of a single segment, but in other embodiments the inner ring 202 may be constructed of a plurality of removable segments.

One or more lubrication channels 107, said lubrication channels 107 communicating the first sliding surface 111 and/or the second sliding surface 112 with the outside for adding lubricant from the outside to the first sliding surface 111 and/or the second sliding surface 112. The lubrication channel 107 is, for example, a channel that opens into the outer race 108 or the inner race 202 and opens out into the sliding surface. Since the sliding frictional contact of the present invention does not require a seal, the lubrication 107 passage does not substantially affect the operation and durability of the bearing. Instead, the lubrication channel 107 would greatly facilitate the addition of lubricant without having to disassemble the bearing 200.

An optional friction plate 110 arranged on the second sliding surface 112. It should be noted here that in other embodiments, it may also be arranged on the first sliding surface 111. By providing a corresponding number and material of friction plates 110, it is possible to provide a desired sliding frictional contact between the sliding surfaces 111, 112, that is, to adjust the frictional force of the sliding contact and to reduce the wear of the inner race 202 and the outer race 108 themselves. By arranging the friction plate 110 on the second sliding surface 112, a sliding frictional contact can be formed between the outer ring 108 and the friction plate 110 of the inner ring 102, whereby a reliable and stable frictional rotation of the inner ring 102 connecting the vanes 101 is facilitated, in particular a free-wheeling of the hub can be avoided. It should be noted, however, that it is also conceivable to arrange the friction plate 110 on the first sliding surface 111, in which case a sliding frictional contact is formed between the inner ring 202 and the friction plate 110 of the outer ring 108. The friction plate 110 may have a base material and a reinforcing material, wherein the base material includes, for example, Polybenzimidazole (PBI), Polyimide (PI), Polyamideimide (PAI), Polyetheretherketone (PEEK), polyphenylene sulfide (PPS), polyphenylene sulfone resin (PPSU), Polysulfone (PSU), Polyetherimide (PEI), polyvinylidene fluoride (PVDF), ethylene chlorotrifluoroethylene copolymer (ECTFE), soluble Polytetrafluoroethylene (PFA), Polytetrafluoroethylene (PTFE), and polyethylene terephthalate (PET), and the base material may be used to provide the friction plate 110 having a good wear resistance; the reinforcing material includes graphite, carbon fiber and glass fiber, through adopting above-mentioned reinforcing material, can further improve the intensity or the wearability of friction disc 110 under the teaching of the utility model, can also select other materials as the base material or the reinforcing material of friction disc.

Fig. 3 shows a flow of a method 300 for maintaining a sliding bearing according to the invention, wherein the dashed boxes represent optional steps.

At step 302, one or more of the detachable segments are removed, wherein the removal operation is performed outside the hub and within the nacelle. Removing the detachable segment may include, for example: removing connectors, such as bolts, nuts, etc., that connect the detachable segments to each other; and removing the connectors, such as bolts, nuts, etc., that connect the detachable segments at the installation location.

At step 304, maintenance is performed on the slipper bearing. Such maintenance operations include, for example, replacing the friction plates of the sliding bearing or replacing the removable segments, etc. The maintenance operation may also include other repair or part replacement operations.

At step 306, the removed detachable segment is mounted back to the slipper bearing. To this end, the detachable segments may be connected to each other and in situ using a connector, such as a bolt or nut.

In optional step 308, lubricant is added to the slipper bearing through the lubrication channel. The addition of the lubricant may be performed periodically. In addition, the interior of the sliding bearing can also be cleaned by the lubrication channel, for which purpose cleaning agents and cleaning liquids can be injected into the lubrication channel.

Fig. 4 shows an embodiment of a friction plate 110 of a sliding bearing according to the present invention.

As shown in fig. 4, the friction plate 110 is disposed within the recess 402 of the second sliding surface 112. In other embodiments, the friction plate 110 may also be disposed within the recess 402 of the first sliding surface 112. The height of the recess 402 is set such that a portion of the friction plate 110 is exposed to provide sliding friction. By placing the friction plate 110 in the recess 402 of a specific height, the bearing capacity of the friction plate 110 can be significantly improved and the deformation in the thickness direction can be reduced, and the friction plate can be fixed by the stopper, thus the cost is lower and the replaceability is better.

An X-shaped notch 401 is provided in the friction plate 110. The gap 401 may span the entire surface of the friction plate 110. It should be noted that the shape and distribution of the indentations 401 is merely exemplary, and in other embodiments, other shapes and distributions of indentations 401 may be provided. The notch 401 is arranged on the friction plate 110, so that noise can be reduced, the contact surface is reduced, and an oil storage effect is achieved.

The utility model discloses have following beneficial effect at least: (1) compared with a rolling bearing, the sliding type bearing of the utility model provides surface contact between an inner ring or a friction material and an outer ring in the operation process, so the contact stress on unit area is low, and the requirement of the surface contact on the precision of parts is not high, therefore, the sliding type bearing of the utility model does not need high-strength materials and high processing precision, thereby reducing the bearing cost; (2) for antifriction bearing, the sliding surface of the sliding bearing of the utility model has low requirement for lubrication, and does not need expensive sealing rings and lubrication systems like ball bearings; (3) for rolling bearings, the process is very expensive and dangerous, especially for future development trends of large megawatt offshore units, since the entire blade or main shaft, pitch bearing or main bearing needs to be hoisted for maintenance or replacement after damage; when the inner friction plate of the sliding bearing is damaged, only a part of detachable segments can be detached, and then the inner structure is maintained and replaced, so that the hoisting process is omitted; moreover, because the contact stress is small, generally speaking, the inner ring and the outer ring are not easy to damage, so the sliding type bearing has higher reliability and durability; especially in the case of an outer ring comprising detachable segments, the mounting of the outer ring (e.g. the hub) can be effected as little as possible during maintenance, so that neither the mounting of the outer ring (hub) nor the attachment of the inner ring (e.g. the blades) has to be destroyed, and the detachment of the detachable segments of the outer ring can be carried out more easily outside the bearing (and not inside the bearing or inside the blades); (4) in the present application, by configuring the inner ring for mounting a rotatable device (such as a blade or a main shaft), the rotatable device can be rotated without interference, because the surface of the inner ring is almost entirely used for sliding frictional contact as compared to the outer ring, and thus interference factors (such as undesired friction, pressure, dirt adhesion, etc.) associated with the exposed surface can be avoided to the greatest extent, thereby facilitating accurate angular adjustment or achieving more stable and reliable rotation of the rotatable device, such as a blade; (5) in the present application, by providing a lubrication passage for adding lubricant, the addition of lubricant can be easily achieved without having to disassemble or break the bearing; (6) the outer ring is connected with the hub through the bolt, so that the whole friction plate is not contacted with the hub, and the maintenance/replacement can be more conveniently carried out; (7) under the condition that the friction plate is placed in the recess with a specific height, the pressure-bearing capacity of the friction plate can be obviously improved, the deformation in the thickness direction is reduced, and the friction plate is fixed by the stop block, so that the cost is lower, and the replaceability is better; (8) under the condition that the surface of the friction plate is provided with X-shaped gaps, the noise can be reduced, the contact surface is reduced, and the oil storage function is realized.

Although some embodiments of the present invention have been described in the present document, it will be understood by those skilled in the art that these embodiments are shown by way of example only. Numerous variations, substitutions and modifications will occur to those skilled in the art in light of the teachings of the present invention without departing from the scope thereof. It is intended that the following claims define the scope of the invention and that methods and structures within the scope of these claims and their equivalents be covered thereby.

Claims (10)

1. A sliding bearing for a wind turbine, comprising:

an outer ring configured to be connectable to or engageable with a hub or main bearing housing of a wind turbine, wherein the outer ring has a first sliding surface;

an inner ring configured to be connectable to or engageable with a blade or a main shaft of a wind turbine, wherein the inner ring has a second sliding surface associated with the first sliding surface, wherein the outer ring and the inner ring are configured such that relative sliding between the first sliding surface and the second sliding surface allows the blade or the main shaft to rotate about a central axis of the inner ring or the outer ring; and

one or more lubrication channels communicating the first and/or second sliding surface with the outside for adding lubricant to the first and/or second sliding surface from the outside.

2. The sliding bearing according to claim 1, wherein the outer ring and/or the inner ring has one or more detachable segments.

3. The sliding bearing according to claim 1, wherein one or more friction plates are arranged on the first sliding surface and/or the second sliding surface.

4. The sliding bearing according to claim 3, wherein the friction plate is disposed on the second sliding surface.

5. The sliding bearing according to claim 3, wherein a notch is provided on the friction plate.

6. The sliding bearing according to claim 1, wherein the outer ring is integrally formed with or is part of a hub or main bearing housing of a wind turbine; and/or

The inner ring is integrally formed with or is part of a blade or a main shaft of the wind turbine.

7. Sliding bearing according to claim 1, wherein a plurality of through holes are provided on the outer ring and/or the inner ring, wherein through the through holes it is possible to connect the outer ring or the inner ring with the hub or the blades or to connect a plurality of detachable segments of the inner ring or the outer ring with each other.

8. The sliding bearing according to claim 3, wherein one or more of the friction plates are arranged on the first sliding surface and/or the second sliding surface such that the friction plates are at an angle to the first sliding surface and/or the second sliding surface.

9. The slide type bearing according to claim 3, wherein the friction plate is disposed in a recess in a circumferential direction of the inner ring or the outer ring.

10. The sliding bearing according to claim 1, wherein the sliding bearing is used as a pitch bearing or a main bearing of a wind turbine.

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