Retainer segment, rolling bearing and wind generating set

Abstract

The invention provides a retainer segment, a rolling bearing and a wind generating set. Pockets are formed in the retainer sections, in the circumferential direction of the rolling bearing, a first limiting face and a second limiting face which are oppositely arranged are formed on the two opposite sides of each retainer section correspondingly, the first limiting faces face the pockets and are used for limiting first rollers located in the pockets, and the second limiting faces face the pockets and are used for limiting second rollers located in the pockets. And the second limiting surface deviates from the pocket hole and is used for limiting a second roller adjacent to the first roller. According to the rolling bearing disclosed by the invention, load impact on the retainer sections in the running process of the rolling bearing can be reduced, the running stability of the bearing is improved, and the service life of the bearing is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of bearings, and in particular to a retaining frame segment for a rolling bearing, a rolling bearing having the retaining frame segment, and a wind turbine generator set having the rolling bearing. Background Art

[0002] The main shaft bearing of a wind turbine is an important transmission component that connects the impeller and generator of the wind turbine. It bears complex radial, axial, overturning moment and other heavy loads. Its structure and performance directly affect the operating condition and service life of the wind turbine.

[0003] With the development of wind power industry, the installed capacity of wind turbines is getting larger and larger. With the increasing load on the main bearing, the size of the main shaft bearing and roller is getting larger and larger. However, the existing segmented cage of the main shaft bearing is usually a multi-pocket structure, which cannot meet the development trend of large-size rollers.

[0004] In addition, during the operation of the bearing, the cage needs to be guided by the rollers, and the multi-pocket cage moves accordingly with the rollers in the raceway of the bearing driven by multiple rollers. Especially when the rollers carry the cage from the load area to the non-load area, the cage is very easy to be damaged, thus affecting the service life of the main shaft bearing and further affecting the operating safety of the wind turbine. Summary of the invention

[0005] The object of the present invention is to provide a retaining frame segment, a rolling bearing having the retaining frame segment and a wind turbine generator set having the rolling bearing, so as to improve the structure and operating performance of the rolling bearing, thereby increasing the service life of the rolling bearing and the operating safety of the wind turbine generator set.

[0006] According to one aspect of the present invention, there is provided a cage segment for a rolling bearing, the rolling bearing comprising a plurality of alternately arranged first rollers and second rollers, the cage segment forming a pocket, and in the circumferential direction of the rolling bearing, oppositely arranged first limiting surfaces and second limiting surfaces are respectively formed on opposite sides of the cage segment, the first limiting surface faces the pocket and is used for limiting the first roller located in the pocket, and the second limiting surface faces away from the pocket and is used for limiting the second roller adjacent to the first roller.

[0007] According to one aspect of the present invention, the retaining frame segment is formed with a single pocket or multiple pockets, and the retaining frame segment includes: a frame body, including two side beams arranged opposite to each other on both sides of each pocket in the circumferential direction of the rolling bearing and a top beam and a bottom beam connecting the two side beams, the side beams, the top beam and the bottom beam enclose a pocket for accommodating a first roller; a first protrusion protruding from a first side of each of the side beams and extending toward one of the inner ring raceway and the outer ring raceway of the rolling bearing, the first limiting surface and the second limiting surface are respectively formed on one side of the first protrusion facing the pocket and the other side away from the pocket.

[0008] According to one aspect of the present invention, the first limiting surface and the second limiting surface are symmetrically arranged and are both arc-shaped concave surfaces. In the direction facing the raceway, the first limiting surface and the second limiting surface gradually move away from each other.

[0009] According to one aspect of the present invention, the first protrusion further comprises a raceway contact surface connecting the first limiting surface and the second limiting surface, and the raceway contact surface is a convex arc surface and can be tangent to the raceway it faces.

[0010] According to one aspect of the present invention, the first limiting surfaces facing each other on both sides of the pocket are located on a first circle with a radius R1, the radius R1 is larger than the radius R2 of the corresponding part of the roller, and the width of the opening formed between the outer ends of the two first protrusions is smaller than the width of the roller.

[0011] According to one aspect of the present invention, the first protrusion is a hollow structure, or a plurality of the first protrusions are formed on each side beam and are spaced apart in the length direction of the side beam.

[0012] According to an aspect of the present invention, the cage segment further includes a second protrusion formed on a second side of each of the side beams and extending toward the other of the inner ring raceway and the outer ring raceway.

[0013] According to one aspect of the present invention, the second protrusion is formed as a hollow structure, or a plurality of the second protrusions are formed on each side beam and are arranged at intervals in the length direction of the side beam.

[0014] According to one aspect of the present invention, the second protrusion is formed as a plurality of protrusions, and the end of each protrusion is a spherical surface or a cylindrical surface, which can be in point contact or line contact with the raceway facing it.

[0015] According to another aspect of the present invention, a rolling bearing is provided, which includes a bearing outer ring, a bearing inner ring, and a plurality of rollers. The rolling bearing also includes a retaining frame segment as described above, wherein the plurality of retaining frame segments are arranged between the bearing outer ring and the bearing inner ring at intervals in the circumferential direction of the rolling bearing, and the plurality of rollers include first rollers and second rollers that are alternately arranged, each first roller is arranged in a pocket of each retaining frame segment, and each second roller is arranged between two adjacent retaining frame segments.

[0016] According to another aspect of the present invention, one of the bearing inner ring and the bearing outer ring has a first stop flange and a second stop flange arranged opposite to each other in the axial direction of the rolling bearing, and the first stop flange and the second stop flange respectively limit the roller at both axial ends of the roller.

[0017] According to another aspect of the present invention, the first protrusion faces the bearing outer ring, and the first stop flange and the second stop flange are formed on the bearing inner ring.

[0018] According to another aspect of the present invention, the roller is a tapered roller or a cylindrical roller, and the rolling bearing is a thrust roller bearing.

[0019] According to another aspect of the present invention, a wind turbine generator set is provided, characterized in that the wind turbine generator set comprises the rolling bearing as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and other objects and features of the present invention will become more apparent through the following description in conjunction with the accompanying drawings which exemplarily illustrate an example, in which:

[0021] Figure 1 is a three-dimensional diagram of a rolling bearing according to an embodiment of the present invention;

[0022] Figure 2 yes Figure 1 A three-dimensional view of a rolling bearing after the outer ring of the bearing is removed;

[0023] Figure 3 and Figure 4 They are three-dimensional images of the cage segments at different angles;

[0024] Figure 5 and Figure 6 They are three-dimensional images of rollers and cage segments in assembled state at different angles;

[0025] Figure 7 Shows Figure 1 Partial cross-section of a rolling bearing

[0026] Figure 8 A cross-section of the rollers within a cage segment is shown. DETAILED DESCRIPTION

[0027] The main shaft bearings used in existing wind turbines are usually tapered roller bearings, including a bearing inner ring, a bearing outer ring, a cage, and multiple rollers. An inner ring raceway is formed on the bearing inner ring, and an outer ring raceway is formed on the bearing outer ring. The inner ring raceway and the outer ring raceway face each other and together form a bearing raceway for accommodating rollers. The cage includes multiple cage segments arranged in sequence in the circumferential direction of the bearing, which are used to separate adjacent rollers.

[0028] Most of the existing rolling bearing cage segments are designed to have multiple pockets in a group, for example, 3 pockets in a group, 4 pockets in a group, or 5 pockets in a group. Multiple cage segments are arranged adjacent to each other in the circumferential direction of the rolling bearing in the raceway to separate the rollers from each other.

[0029] In order to ensure the thermal expansion of the cage and roller, sufficient clearance needs to be left between the roller and the cage pocket and between adjacent cage segments. The larger the size of the cage segment and the roller, the greater the thermal expansion, and the larger the clearance that needs to be reserved between the roller and the cage segment and between adjacent cage segments. When the clearance is large and the total weight of a single cage segment and multiple rollers is large, when the roller moves from the load area to the non-load area, under the action of gravity and centrifugal force, a large impact load will be formed on the bearing, especially the collision between adjacent cage segments, which is easy to cause the cage segment to deform, crack or even break, which will directly affect the structure and operating performance of the bearing.

[0030] In addition, due to the limitations of the injection molding process, the deformation of the multi-pocket cage is difficult to control and the dimensional stability is poor.

[0031] In order to avoid the influence of large impact loads on the bearing structure, the present invention provides a cage segment and a rolling bearing having the cage segment.

[0032] In the embodiments of the present invention, although the main shaft bearing of a wind turbine generator set is used as an example for description, the solution of the present invention is not limited to the main shaft bearing of a wind turbine generator set, and other types of bearings are also applicable. Similarly, the roller can be a tapered roller, or a cylindrical roller, a ball, etc., and each roller type will not be described separately here.

[0033] Next, we will combine the attached Figures 1 to 7 A cage segment according to an embodiment of the present invention and a rolling bearing having the cage segment.

[0034] Figure 1 is a three-dimensional diagram of a rolling bearing according to an embodiment of the present invention; Figure 2 yes Figure 1 A three-dimensional view of the rolling bearing in Figure 1 after the outer ring of the bearing has been removed. Figure 1 and Figure 2 As shown, the rolling bearing comprises a bearing outer ring 150, a bearing inner ring 160, a plurality of rollers 140 and a plurality of cage segments 100. A single pocket or a plurality of pockets are formed in the cage segment 100 for accommodating the rollers 140. Two adjacent cage segments 100 are arranged between the bearing outer ring 150 and the bearing inner ring 160 in the circumferential direction of the rolling bearing, and a roller is arranged between the two adjacent cage segments 100, so that the two adjacent cage segments 100 are spaced apart from each other.

[0035] Figure 3 and Figure 4 The three-dimensional images of the retainer segments at different angles according to the embodiments of the present invention are shown respectively. Figure 3 and Figure 4 As shown, in the circumferential direction of the rolling bearing, a first limiting surface 121 and a second limiting surface 122 are formed on opposite sides of each pocket of the retaining frame segment 100, respectively. The first limiting surface 121 faces the pocket 114 and is used to limit the first roller 141 located in the pocket 114. The second limiting surface 122 faces away from the pocket 114 and is used to limit the second roller 142 adjacent to the first roller 141.

[0036] Figure 5 and Figure 6 The schematic diagrams of the arrangement structure between the plurality of rollers 140 and the plurality of cage segments 100 are respectively shown. In order to clearly show the positional relationship between the rollers 140 and the cage segments 100, other structures of the rolling bearing are omitted.

[0037] like Figure 5 and Figure 6 As shown, when a plurality of cage segments 100 and a plurality of rollers 140 are arranged in the bearing raceway, each cage segment 100 can be arranged with one roller spaced apart. More specifically, the plurality of rollers 140 include a first roller 141 and a second roller 142 spaced apart in the circumferential direction, the first roller 141 being arranged in the pocket 114 of the cage segment 100, and the second roller 142 being located between two adjacent cage segments 100, so that the adjacent cage segments 100 are spaced apart from each other by a predetermined distance.

[0038] For the first roller 141 located in the pocket 114, the two first limiting surfaces 121 facing each other on both sides of the corresponding pocket 114 are used for limiting and guiding the movement. For the second roller 142 located between two cage segments 100, a pocket is formed by the second limiting surfaces 122 facing each other on both sides of each cage segment 100, so as to limit and guide the movement of the second roller 142 without providing an additional cage segment.

[0039] According to the rolling bearing of the embodiment of the present invention, since a cage segment 100 is provided for each roller 140, adjacent cage segments can be spaced a certain distance from each other, thereby preventing the cage segments 100 from colliding with each other and causing damage.

[0040] According to an embodiment of the present invention, the retaining cage segment is omitted for the second roller 140. Therefore, under the same conditions, the space occupied by the retaining cage in the raceway is reduced. Compared with a structure in which each roller 140 is arranged in a pocket of the retaining cage, more rollers 140 can be arranged, thereby improving the load-bearing capacity of the rolling bearing.

[0041] According to another aspect of the embodiment of the present invention, the cage segment 100 is formed into a single-pocket structure, so that one roller is disposed in each cage segment 100. For each cage segment 100 and the first roller 141 disposed in the cage segment 100, compared with a rolling bearing using a multi-pocket cage, the impact load generated when a collision occurs is smaller, and thus the damage caused by the collision is correspondingly reduced.

[0042] On the one hand, the thermal expansion of the single-pocket cage segment is greatly reduced compared to the multi-pocket cage segment under the same thermal expansion coefficient, so the expansion gap reserved for the cage segment is also reduced accordingly. Due to the reduction of the gap between the cage segments, the impact caused by the roller and the cage segment leaving the load area and colliding with the adjacent cage segment due to the influence of gravity during the operation of the bearing is greatly reduced, and because the adjacent cage segments 100 are separated from each other, mutual collision is avoided, thereby reducing the possibility of damage to the cage segments.

[0043] On the other hand, for each cage segment 100 and the first roller 141 located in the cage segment 100, compared with a rolling bearing using a multi-pocket cage, the combination of a single roller and a cage segment has a smaller weight and generates a smaller impact load when a collision occurs, so the damage caused by the collision is also reduced accordingly.

[0044] In addition, due to the small impact load, the noise generated during the operation of the rolling bearing is also reduced accordingly. Furthermore, when the single-pocket cage expands due to heat, its thermal expansion is small and the deformation is easier to control. It saves materials and has low costs during production and processing.

[0045] Next, the specific structure of the cage segment according to the embodiment of the present invention is described in detail.

[0046] like Figure 3 and Figure 4 As shown, the cage segment 100 includes a frame body 110. The frame body 110 includes two side beams 111 arranged opposite to each other on both sides of each pocket in the circumferential direction of the rolling bearing, and a top beam 112 and a bottom beam 113 connecting the two side beams 111. The two side beams 111 are arranged at intervals, and the top beam 112 and the bottom beam 113 connect the two side beams 111 at the top and bottom ends of the two side beams 111, respectively, so as to enclose a single pocket for accommodating the roller 140. The first limiting surface 121 and the second limiting surface 122 are respectively located on the opposite sides of each side beam 111. In the circumferential direction of the rolling bearing, the first limiting surface 121 and the second limiting surface 122 located on one side of the pocket are arranged back to back, and the two first limiting surfaces facing the pocket are arranged facing each other.

[0047] Furthermore, the cage segment 100 further includes a first protrusion 120, which is protrudingly arranged on a first side of each of the side beams 111 and extends toward one of the inner ring raceway and the outer ring raceway of the rolling bearing, and a first limiting surface 121 and a second limiting surface 122 are respectively formed on one side of the first protrusion 120 facing the pocket hole and the other side away from the pocket hole. An opening is formed between the ends of the facing raceway surfaces of the two first protrusions 120, and the spacing of the opening is smaller than the width of the roller 140, so as to hold the roller 140 from the outside and allow the convex arc surface of the roller 140 to be exposed outward to make rolling contact with the raceway surface.

[0048] For each first roller 141 in the pocket, the two first limiting surfaces 121 of the cage segment 100 facing the pocket, the side beam 111, the top beam 112 and the bottom beam 113 form an accommodating space for accommodating the first roller 141, limiting the first roller in the pocket.

[0049] like Figure 3 and Figure 4As shown, in order to guide the movement of the roller 140, the first limiting surface 121 and the second limiting surface 122 have a shape corresponding to the outer contour of the roller 140. For example, in the case where the roller 140 is a cylindrical roller, a tapered roller, or a ball, the first limiting surface 121 and the second limiting surface 122 can be formed as arc-shaped concave surfaces, and are symmetrically arranged to surround the roller 140 from the outside of the roller 140. The first limiting surface 121 and the second limiting surface 122 hold the roller 140 through the arc-shaped concave surfaces, which can straighten the roller 140 on the one hand, and on the other hand, can make the cage segment 100 hang on the roller 140 and move with the roller 140, and the good fit between the two can also reduce the friction between the two, reduce noise and wear.

[0050] Taking the roller 140 as a cylindrical roller or a tapered roller as an example, the first limiting surface 121 and the second limiting surface 122 can be formed as concave surfaces with the corresponding shapes of the cylinders, and in the direction toward the facing raceway surfaces, the two gradually move away from each other, so as to be able to wrap the first roller 141 and the second roller 142 respectively.

[0051] During the operation of the rolling bearing, the roller 140 rolls in the raceway under the action of the external load, and the cage is usually movably arranged between the inner ring and the outer ring of the bearing, so that it can move with the roller to avoid the roller from being stuck due to the fixed cage. During the movement of the cage segment 100, the first protrusion 120 can contact the raceway surface of the rolling bearing to support and guide the cage segment 100.

[0052] According to an embodiment of the present application, the first protrusion 120 further has a raceway contact surface 123 on the side facing the raceway surface, and the raceway contact surface 123 connects the first limiting surface 121 and the second limiting surface 122 at the outer end of the first protrusion 120. The raceway contact surface 123 is formed as a convex arc surface. As an example, the raceway contact surface 123 can be tangent to the facing raceway surface, and when the retaining frame segment moves relative to the raceway and abuts against the raceway surface, it can fit well with the raceway surface, thereby reducing vibration or shaking and avoiding the skew of the retaining frame segment 100. In the length direction of the side beam 111, the shape of the first protrusion 120 can be formed into a fan shape, so that a fan-shaped pocket is formed in the retaining frame segment, and a fan-shaped pocket can also be formed between two adjacent retaining frame segments.

[0053] Continue to refer to Figure 3 and Figure 4The first protrusion 120 can be formed as a hollow structure, or the first protrusion 120 is formed as a plurality of protrusions in the length direction of the side beam 111 and arranged at intervals. This structure is conducive to forming a lubricating oil flow channel, so that the lubricating oil can fully lubricate the retaining frame and the roller 140, thereby enhancing the lubrication effect. At the same time, the iron filings and residues generated by the friction between the roller 140 and the raceway can be transferred out more smoothly to avoid the accumulation of iron filings and residues.

[0054] According to an embodiment of the present invention, the cage segment 100 may further include a second protrusion 130, which is formed on the other side of the frame body 110 and faces the other raceway of the outer ring raceway and the inner ring raceway. More specifically, the second protrusion 130 is formed on the second side of each side beam 111 and extends toward the other of the inner ring raceway and the outer ring raceway. The first protrusion 120 and the second protrusion 130 are formed on opposite sides of the frame body 110, facing one and the other of the outer ring raceway and the inner ring raceway, respectively, and can contact the corresponding raceway surface during the movement of the cage segment to support the cage segment 100 and guide the movement trajectory on the raceway.

[0055] According to one aspect of the embodiment of the present invention, the second protrusion 130 can be formed as a hollow structure, or the second protrusion 130 can be formed as a column or claw, and a plurality of protrusions are formed on each side beam 111 and are arranged at intervals in the length direction of the side beam 111. This structure is conducive to the flow of lubricating oil, so that the lubricating oil can fully lubricate the cage and the roller 140, enhance the lubrication effect, and at the same time, the iron chips and residues generated by the friction between the roller 140 and the raceway are more smoothly transferred out to avoid the accumulation of iron chips and residues.

[0056] In the example shown in the drawings, the second protrusion 130 is formed as a plurality of protrusions, and the end of each protrusion is a spherical surface or a cylindrical surface, which can be in point contact or line contact with the inner ring raceway and the outer ring raceway facing it. In the example shown in the drawings, a spherical protrusion 132 is formed on the end of the second protrusion 130. When the spherical protrusion 132 abuts against the raceway, the friction between the raceway and the spherical protrusion 132 can be reduced due to the small contact area, thereby reducing the wear of the raceway and reducing the heat generation. In addition, when slight shaking and impact occur during the movement of the bearing, the shape of the spherical surface can be a cage following micro-motion, thereby avoiding the phenomenon of stress concentration. In addition, the end of the second protrusion 130 is formed as a columnar shape, and the cylindrical surface contacts the raceway. Compared with the spherical protrusion, the contact area with the raceway is slightly increased, which can improve the support stability of the cage while taking into account the small contact area and avoid the shaking of the cage.

[0057] In addition to making the first protrusion 120 and the second protrusion 130 into a hollow, columnar or claw shape to form gaps between the parts to improve the lubrication effect, some oil grooves 115 can also be opened at the position where the inner surface of the pocket 114 is opposite to the axial ends of the roller to facilitate the lubricating oil to flow between the roller 140 and the inner surface of the pocket 114 and facilitate the better discharge of iron chips.

[0058] In addition, since the first protrusion 120 and the second protrusion 130 are made into a hollow shape, a column shape or a claw shape, the contact area between the pocket 114 and the roller 140 is reduced, thereby avoiding wear on the surface of the roller 140. If the contact area is large, the friction caused to the surface of the roller 140 will affect the surface roughness of the roller 140 and reduce the service life of the bearing.

[0059] Furthermore, since there are gaps between the plurality of first protrusions 120 and there are gaps between the plurality of second protrusions 130 , the heat dissipation effect inside the bearing is improved.

[0060] According to the retaining frame segment of the embodiment of the present invention, since the first protrusion 120 and the second protrusion 130 are formed in a hollow shape, a columnar shape or a claw shape with a certain gap between them, when manufacturing the retaining frame segment, the injection molding material has better fluidity, the formed retaining frame segment is not easy to deform, and the size is more stable.

[0061] According to an embodiment of the present invention, one of the bearing outer ring 150 and the bearing inner ring 160 can be a rotating ring body, and the other can be a fixed ring body. The cage segment 100 is guided by the rotating ring body and follows the movement of the roller 140. In order to reduce the friction between the cage segment 100 and the rotating ring body, the second protrusion 130 faces the rotating ring body, and contacts the raceway surface of the rotating ring body through the spherical end or cylindrical end of the second protrusion 130. The first protrusion 120 contacts the raceway surface of the fixed ring body through the raceway contact surface 123. The area of ​​the raceway contact surface 123 of the first protrusion 120 is larger than the area of ​​the end of the second protrusion 130, which is used to support the cage segment 100, reduce the vibration and shaking of the cage segment, and ensure that the cage segment runs relatively smoothly. The second protrusion 130 contacts the raceway surface through the spherical or cylindrical end, which can reduce friction and frictional heat.

[0062] In an embodiment of the present invention, the bearing outer ring 150 is a fixed ring body, and the bearing inner ring 160 is a rotating ring body. Therefore, the first protrusion 120 faces the outer ring raceway formed on the bearing outer ring 150, and the second protrusion 130 faces the inner ring raceway formed on the bearing inner ring 160.

[0063] The first limiting surface 121 and the second limiting surface 122 on both sides of the first protrusion 120 can wrap the roller 140 during the operation of the bearing, so that the roller 140 and the cage segment 100 can run relatively smoothly. The raceway contact surface 123 on the first protrusion 120 can be formed to be tangent to the raceway surface of the outer ring raceway, and there is a certain distance between the two. During the operation of the bearing, under the action of centrifugal force, the raceway contact surface 123 of the first protrusion 120 of the cage segment 100 may abut against the outer ring raceway. Since the raceway contact surface 123 is a convex arc surface tangent to the outer ring raceway, even if the cage segment 100 shakes, the first protrusion 120 can still abut or fit on the outer ring raceway steadily, reducing the shaking degree of the cage segment 100.

[0064] In order to axially limit the roller 140, one of the outer ring raceway and the inner ring raceway has stop flanges arranged opposite to each other in the axial direction of the rolling bearing, and the axial ends of the roller 140 are respectively limited in the raceway by the stop flanges.

[0065] Figure 7 FIG. 2 shows a partial cross-sectional view of a rolling bearing according to an embodiment of the present invention. Figure 7 As shown, a first stop flange 161 and a second stop flange 162 are formed at the axial ends of the inner ring raceway formed in the inner ring of the bearing, respectively, for limiting the roller 140 at the axial ends of the roller 140. The roller 140 can be limited on the inner ring raceway by the first limiting surface 121, the second limiting surface 122, and the first stop flange 161 and the second stop flange 162 on the cage segment 100. The two ends of the cage segment 100 are limited by the axial ends of the roller 140 respectively.

[0066] Figure 8 The figure shows the matching relationship between the pocket and the roller. Taking the roller as a cylindrical roller or a tapered roller as an example, Figure 8 is a cross-sectional view taken at any position in the axial direction of the roller 140. Figure 8 As shown, the first limiting surfaces 121 facing each other on both sides of the pocket hole form a part of the first circle with a radius of R1, and the radius of the roller 140 at this position is R2, then the radius R1 is greater than the radius R2, that is, there is a gap between the two first limiting surfaces 121 and the roller 140. Even when the roller fits with the first limiting surface 121, there is still a gap between the other part of the roller 140 and the first limiting surface 121, so that there can be lubricating oil between the two to reduce frictional heat and wear. In addition, since the gap between the two is always maintained, debris and impurities can be discharged to the outside of the rolling bearing under the action of centrifugal force.

[0067] When the rolling bearing according to the embodiment of the present invention is running, the retaining frame segment 100 will abut against the bearing outer ring 150 under the action of centrifugal force. At this time, the first circle formed by the first limiting surfaces 121 facing each other is eccentrically arranged relative to the roller 140, and there is a gap between the roller 140 and the first protrusion 120, so that iron filings and residues will not be clamped between the roller 140 and the first protrusion 120, which is conducive to the discharge of residues.

[0068] In the embodiment shown in the drawings, the outer ring 150 of the bearing is determined as a fixed ring body, and the inner ring 160 of the bearing is determined as a rotating ring body, so that the first protrusion 120 faces the outer ring 150 of the bearing and the second protrusion 130 faces the inner ring 160 of the bearing, and the second protrusion 130 with a smaller end area contacts the rolling ring body, which can reduce the wear caused by friction and reduce the friction heat. However, according to another aspect of the embodiment of the present invention, the outer ring 150 of the bearing can also be a rotating ring body and the inner ring 160 of the bearing is a fixed ring body, and accordingly, the first protrusion 120 faces the inner ring 160 of the bearing and the second protrusion 130 faces the outer ring 150 of the bearing, and the first stop flange 161 and the second stop flange 162 can be formed on the outer ring 150 of the bearing.

[0069] When the inner ring 160 of the bearing is a rotating ring body, the retainer can be guided by the second protrusion 130 on the inner ring raceway to perform a motion trajectory, i.e., internal guidance. According to an embodiment of the present invention, the length of the second protrusion 130 is greater than the length of the first protrusion 120, and the inner guidance method is adopted, and the rotation of the inner ring of the bearing is conducive to the orbital revolution of the retainer. When the inner ring of the bearing is a rotating ring body, if the second protrusion 130 is guided by the motion trajectory on the outer ring raceway, i.e., external guidance, the fixed outer ring of the bearing will prevent the retainer from orbiting, which is easy to cause roller jamming.

[0070] In the embodiment of the present invention, the raceway contact surface 123 on the first protrusion 120 can be designed to be parallel to the raceway surface of the inner ring raceway, which can better prevent the cage from being skewed and is more conducive to the operation of the bearing.

[0071] In the example shown in the drawings, the rolling bearing is a tapered roller bearing and a thrust roller bearing. However, the rolling bearing of the present invention is not limited thereto and may also be a cylindrical roller bearing or other types of rolling bearings.

[0072] According to the rolling bearing provided by the embodiment of the present invention, since the cage segment 100 is formed as a single-pocket bearing, and the two ends of the cage segment 100 are formed with a second limiting surface for limiting and guiding the roller 140 outside the pocket 114, the cage segment 100 can be arranged one roller 140 apart. Adjacent cage segments 100 are spaced a predetermined distance apart to avoid mutual collision and the resulting impact. Since the thermal expansion of the single-pocket cage is relatively small, the total clearance in the rolling bearing is reduced, so that the shaking degree between the rollers 140 is reduced, and the impact load during the operation of the bearing is reduced. Since the space occupied by the cage segment is reduced overall, the number or size of the rollers 140 can be increased accordingly, and the bearing capacity of the rolling bearing is correspondingly improved.

[0073] In addition, compared with the multi-pocket cage segment, the single-pocket cage segment of the embodiment of the present invention can simplify the mold design in terms of manufacturing process, and the injection molding material has better fluidity, and the manufactured cage segment has better dimensional stability. Since the number of cage segments is reduced, the manufacturing cost of the cage is reduced.

[0074] According to another aspect of the present invention, a wind turbine generator set is also provided, the wind turbine generator set comprising the rolling bearing described above. As an example, the rolling bearing may be a main shaft bearing, a pitch bearing, a yaw bearing, etc. of the wind turbine generator set.

[0075] Although the embodiments of the present invention have been described with reference to the accompanying drawings, the technical solutions of the present invention are not limited thereto. Those skilled in the art may make corresponding modifications and variations to the embodiments without departing from the spirit and principles of the present invention, and these modifications or variations are still within the protection scope of the present invention.

[0076] In the present disclosure, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present disclosure, unless otherwise specified, "plurality" means two or more.

[0077] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

[0078] The features, structures or characteristics described in the present disclosure may be combined in one or more embodiments in any suitable manner. In the above description, many specific details are provided to provide a full understanding of the embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced without one or more of the specific details, or other methods, components, materials, etc. may be adopted. In other cases, known structures, materials or operations are not shown or described in detail to avoid blurring the various aspects of the present disclosure.

Claims

1. A cage segment for a rolling bearing, the rolling bearing comprising a plurality of first rollers (141) and second rollers (142) arranged alternately, characterized in that: The cage segment (100) is formed with a pocket, and in the circumferential direction of the rolling bearing, a first limiting surface (121) and a second limiting surface (122) are respectively formed at opposite ends of the cage segment (100), wherein the first limiting surface (121) faces the pocket and is used to limit a first roller (141) located in the pocket, and the second limiting surface (122) faces away from the pocket and is used to limit a second roller (142) adjacent to the first roller (141).

2. The cage segment according to claim 1, characterized in that The cage segment (100) forms a single pocket or a plurality of pockets, and the cage segment comprises: A frame body (110) comprising two side beams (111) arranged opposite to each other on both sides of each pocket in the circumferential direction of the rolling bearing, and a top beam (112) and a bottom beam (113) connecting the two side beams (111), wherein the side beams (111), the top beam (112) and the bottom beam (113) enclose a pocket for accommodating a first roller (141); A first protrusion (120) is protrudingly arranged on a first side of each of the side beams (111) and extends toward one of the inner ring raceway and the outer ring raceway of the rolling bearing, and the first limiting surface (121) and the second limiting surface (122) are respectively formed on one side of the first protrusion (120) facing the pocket and the other side away from the pocket.

3. The cage segment according to claim 2, characterized in that: The first limiting surface (121) and the second limiting surface (122) are symmetrically arranged and are both arc-shaped concave surfaces. In the direction facing the raceway, the first limiting surface (121) and the second limiting surface (122) gradually move away from each other.

4. The cage segment according to claim 3, characterized in that: The first protruding portion (120) further comprises a raceway contact surface (123) connecting the first limiting surface (121) and the second limiting surface (122); the raceway contact surface (123) is a convex arc surface and can be tangent to the raceway it faces.

5. The cage segment according to claim 3, characterized in that: The first limiting surfaces (121) facing each other on both sides of the pocket hole are located on a first circle with a radius R1, the radius R1 is greater than the radius R2 of the corresponding part of the roller (140), and the width of the opening formed between the outer ends of the two first protrusions (120) is smaller than the width of the roller.

6. The cage segment according to claim 2, characterized in that: The first protrusion (120) is a hollow structure, or a plurality of the first protrusions (120) are formed on each side beam (111) and are arranged at intervals in the length direction of the side beam (111).

7. The cage segment according to any one of claims 1 to 6, characterized in that: The cage segment (100) further includes a second protrusion (130) formed on a second side of each of the side beams (111) and extending toward the other of the inner ring raceway and the outer ring raceway.

8. The cage segment according to claim 7, characterized in that The second protrusion (130) is formed as a hollow structure, or a plurality of the second protrusions (130) are formed on each side beam (111) and are arranged at intervals in the length direction of the side beam (111).

9. The cage segment according to claim 8, characterized in that The second protrusion (130) is formed as a plurality of protrusions, and the end of each protrusion is a spherical surface or a cylindrical surface, which can make point contact or line contact with the raceway facing it.

10. A rolling bearing, comprising a bearing outer ring (150), a bearing inner ring (160), and a plurality of rollers (140), characterized in that: The rolling bearing also includes a retaining frame segment (100) as described in any one of claims 1 to 9, and a plurality of the retaining frame segments (100) are arranged at intervals between the bearing outer ring (150) and the bearing inner ring (160) in the circumferential direction of the rolling bearing, and the plurality of rollers (140) include first rollers (141) and second rollers (142) that are alternately arranged, each first roller (141) is arranged in a pocket of each retaining frame segment (100), and each second roller (142) is arranged between two adjacent retaining frames segments (100).

11. The rolling bearing according to claim 10, characterized in that: One of the bearing inner ring (160) and the bearing outer ring (150) has a first stop flange (161) and a second stop flange (162) which are arranged opposite to each other in the axial direction of the rolling bearing, and the first stop flange (161) and the second stop flange (162) respectively limit the roller (140) at two axial ends of the roller (140).

12. The rolling bearing according to claim 11, characterized in that: The first protrusion (120) faces the bearing outer ring (150), and the first stop flange (161) and the second stop flange (162) are formed on the bearing inner ring (160).

13. The rolling bearing according to claim 11, characterized in that: The roller (140) is a tapered roller or a cylindrical roller, and the rolling bearing is a thrust roller bearing.

14. A wind turbine generator set, characterized in that: The wind turbine generator set comprises a rolling bearing according to any one of claims 10-13.

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