JP2006177445A - Double-row automatic aligned roller bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a double-row automatic aligned roller bearing different in load capacity between right and left rows, using symmetrical standard products for an outer ring and having high measuring working efficiency when measuring the accuracy of inner and outer rings. <P>SOLUTION: The double-row automatic aligned roller bearing 21 comprises the inner ring 22, the outer ring 23, and spherical rollers 24, 25 different in roller lengths arranged in right and left rows between the inner ring 22 and the outer ring 23. Contact angles θ1, θ2 of the right and left rows are the same. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a double-row spherical roller bearing, and more particularly to a double-row spherical roller bearing in which an uneven load is applied to the left and right rows of spherical rollers, and a main shaft support structure of a wind power generator having such a bearing. It is about.

  A self-aligning roller bearing suitable for rotatably supporting a main shaft of a wind power generator is disclosed in, for example, Japanese Patent Application Laid-Open No. 2004-11737 (Patent Document 1). As disclosed in the publication, a large double row self-aligning roller bearing 1 as shown in FIG. 1 is often used for a main shaft bearing in a large wind power generator.

  Since the main shaft 2 of the wind turbine of the wind power generator is attached to the housing 4 so as to cantilever-support the tip side where the blade 3 is provided, the main shaft 2 is usually used as a bearing for supporting the cantilever. A large spherical roller bearing 1 that can be used is used. The self-aligning roller bearing 1 includes an inner ring 5, an outer ring 6, and double-row spherical rollers 7 and 8.

  The double row spherical roller bearing 1 for supporting the main shaft of the wind power generator is loaded with a large axial load in addition to the radial load during rotation of the wind turbine. In this case, the spherical roller 8 in the row farther from the blade 3 out of the double row spherical rollers 7 and 8 receives the radial load and the axial load at the same time. On the other hand, the spherical roller 7 in the row closer to the blade 3 is not subjected to much axial load and is exclusively subjected to radial load.

  As described above, a double row self-aligning roller bearing used in an environment in which an uneven load acts on the left and right rows of spherical rollers is disclosed in, for example, Japanese Patent Application Laid-Open No. 2004-245251 (Patent Document 2). . As shown in FIG. 2, the double row spherical roller bearing 11 disclosed in the publication includes an inner ring 12, an outer ring 13, and double row spherical rollers 14, 15. A cage 16 that holds the interval is provided for each column separately.

In the double row spherical roller bearing 11 described above, the roller lengths L ₁ and L ₂ of the spherical rollers 14 and 15 are set to L ₁ <L _2, and the contact angles θ ₁ and θ ₂ of the left and right rows are set to θ _1. By setting <θ ₂ , it is possible to increase the axial load carrying capacity in the right column of the figure.

  The double-row self-aligning roller bearing 11 is provided with a spherical roller 14 having a short roller length on the side close to the blade for supporting the main shaft of the wind power generator, so that appropriate support according to the load can be performed in each row. Thus, the real life can be extended. In addition, the material is economical and economical.

Further, according to the publication, as means for making the load capacity different between the left and right rows of spherical rollers, a method of making the roller diameters of the spherical rollers different between the left and right rows and further making the contact angle different between the left and right rows is disclosed. ing.
JP 2004-11737 A (paragraph number 0002 etc.) JP-A-2004-245251 (paragraph number 0008, etc.)

In the double-row spherical roller bearing 11 described above, the inner ring 12 and the outer ring 13 are asymmetric in the left and right directions by making the contact angles θ ₁ and θ ₂ different between the left and right rows 11a and 11b.

  As a result, in the manufacture of the double-row spherical roller bearing 11, custom-made products must be used for the inner ring and the outer ring, which increases the manufacturing cost.

  Further, when measuring the accuracy of the left and right asymmetric inner rings and outer rings, the right and left columns cannot be measured under the same measurement conditions, so that there is a problem that the measurement work becomes complicated.

  The object of the present invention is to reduce the manufacturing cost by using a symmetrical product for the outer ring in a double row spherical roller bearing with different load capacities in the left and right rows, and at the time of measuring the accuracy of the inner and outer rings. It is to provide a double row spherical roller bearing capable of improving work efficiency.

  The double-row spherical roller bearing according to the present invention includes inner rollers, outer rings, and spherical rollers having different load capacities in the left and right rows between the inner and outer rings, and the contact angles of the left and right rows are the same. It is characterized by being.

  By adopting the above configuration, since the outer ring is symmetric in the left and right rows, a standard product can be used, so that the manufacturing cost can be suppressed.

  As a method for making the spherical rollers have different load capacities in the left and right rows, for example, the roller lengths in the left and right rows may be different from each other. As a result, a standard product can be used for the outer ring, and at the time of measuring the inner ring and the outer ring, the left and right columns can be measured under the same measurement conditions, so that the measurement work can be made more efficient.

  For spherical rollers, as another way to make the load capacity different in the left and right rows, instead of changing the roller length, or in addition to the method of making the roller length different, the roller diameters are different from each other Also good.

  Furthermore, the spherical rollers may be solid rollers on the left and right rows and hollow rollers on the other. In this case, if the sizes of the spherical rollers in the left and right rows are the same, both the inner ring and the outer ring are symmetrical in the left and right rows, and a standard product can be used, so that the manufacturing cost can be suppressed. Further, since the lubricating oil is accumulated in the hollow portion of the hollow roller, the lubricating performance of the end surface of the hollow roller is improved, and the lubricating life can be extended.

  The inner ring preferably has a middle collar. When one end surface of the spherical roller and the side surface of the center surface are in contact with each other, rotation of the spherical roller is guided by the center surface, so that the posture of the rotating spherical roller is stabilized.

  The spherical roller is, for example, an asymmetric roller in which the maximum diameter position of the roller does not exist at the center in the length direction of the roller. When asymmetrical rollers are used, an induced thrust load is generated when the bearing receives a load, and the spherical roller is pressed against the center. Therefore, the posture of the rotating spherical roller is more stable and the skew is suppressed. Can do.

  A main shaft support structure of a wind power generator according to the present invention includes a blade that receives wind power, a main shaft that is fixed to the blade, and that rotates together with the blade, and a double row that is incorporated in a fixed member and rotatably supports the main shaft. Spherical roller bearings are provided. When paying attention to the double-row self-aligning roller bearing, it is characterized in that an inner ring, an outer ring, and spherical rollers having different load capacities in the left and right rows are provided, and the contact angles of the left and right rows are the same.

  With the above configuration, proper support corresponding to the characteristics acting on the main shaft can be performed, so that a main shaft support structure with high reliability and long life can be obtained.

  In double row spherical roller bearings with different load capacities in the left and right rows, the left and right rows are symmetrical to the outer ring in the manufacture of double row spherical roller bearings by making the contact angles of the left and right rows the same. Therefore, the manufacturing cost can be reduced. Furthermore, in measuring the accuracy of the inner ring and the outer ring, the left and right columns can be measured under the same measurement conditions, so that the measurement work can be performed efficiently.

  With reference to FIG. 3, the double row self-aligning roller bearing 21 which concerns on one Embodiment of this invention is demonstrated.

  The double-row self-aligning roller bearing 21 maintains an interval between the inner ring 22, the outer ring 23, the spherical rollers 24 and 25 arranged in a double row between the inner ring 22 and the outer ring 23, and the spherical rollers 24 and 25. And a cage 26. The inner ring 22 has a middle collar 27. The raceway surface 23 a of the outer ring 23 is formed in a spherical shape, and the outer peripheral surfaces of the spherical rollers 24 and 25 in each row have a spherical shape along the raceway surface 23 a of the outer ring 23. The cage 26 is provided separately for each column.

Regarding the roller lengths of the spherical rollers 24 and 25, the roller length L ₂ of one spherical roller 25 is longer than the roller length L ₁ of the other spherical roller 24. Further, the contact angles θ ₁ and θ ₂ formed by the plane perpendicular to the bearing center axis and the action line of the resultant force transmitted to the left and right rows of spherical rollers 24 and 25 by the inner ring 22 and the outer ring 23 are the same.

Double row self-aligning roller bearing 21 having the above configuration, by increasing the roller length L ₂ of the spherical rollers 25, axial load the load capacity of the bearing 21b on the right column becomes high. As a result, when used in an environment where uneven loads are applied to the left and right columns, such as the main shaft support of a wind power generator, appropriate support according to the load can be performed in each column.

In addition, by making the contact angles θ ₁ and θ ₂ of the left and right rows 21a and 21b of the bearings the same, it is possible to use a symmetrical standard product for the outer ring, thereby making it possible to reduce the manufacturing cost. Furthermore, since the right and left columns can be measured under the same measurement conditions when measuring the accuracy of the inner ring and the outer ring, the measurement work can be performed efficiently.

  In the double row self-aligning roller bearing 21, the end faces 24a, 25a of the spherical rollers 24, 25 are in contact with both side surfaces 27a, 27b of the intermediate flange 27, so that the rotation of the spherical rollers 24, 25 is caused by the intermediate flange 27. Since guided, the posture of the rotating spherical rollers 24 and 25 is stabilized.

  Next, with reference to FIG. 4, a double-row self-aligning roller bearing 31 according to another embodiment of the present invention will be described.

  The double-row self-aligning roller bearing 31 includes an inner ring 32 having an intermediate collar 37, an outer ring 33, double-row spherical rollers 34 and 35, and a cage 36 provided for each row.

In this embodiment, with respect to the roller diameter of the left and right of the spherical rollers 34 and 35 is made larger than the roller diameter R ₁ of the roller diameter R ₂ of the other spherical rollers 34 of one of the spherical roller 35. Also, the contact angles θ ₁ and θ ₂ of the left and right rows 31a and 31b of the bearing are the same.

For even double row self-aligning roller bearing 31 shown in FIG. 4, by increasing the roller diameter R ₂ of one spherical rollers 35, column 31a of the right and left bearings, the contact angle theta ₁ of _31b, it is identical to theta ₂ Thus, it is possible to make the outer ring bilaterally symmetric while maintaining the axial load capacity of the bearings 31b in the right row. As a result, since a standard product can be used for the outer ring, the manufacturing cost can be suppressed. Furthermore, since the right and left columns can be measured under the same measurement conditions when measuring the accuracy of the outer ring, the measurement work can be performed efficiently.

  Also, as shown in FIG. 5, either one of the left and right spherical rollers of the double row spherical roller bearing is a hollow roller having through holes 71 penetrating both end faces, and the other is a solid roller. Accordingly, the load capacities may be made different between the left and right rows, and the contact angles may be the same between the left and right rows of the bearings.

  By adopting the above configuration, spherical rollers having the same roller length and roller diameter can be used in the left and right rows of bearings, so that both the inner ring and the outer ring can be standard products, and the manufacturing cost can be reduced. Is possible.

  Further, since the lubricating oil is accumulated in the through hole 71 of the hollow roller 70, the lubricating performance of the both end faces 72 and 73 of the hollow roller is improved, and the lubricating life can be extended.

  In the above embodiment, an example in which the roller lengths and roller diameters of the left and right spherical rollers are the same is shown, but the present invention is not limited to this, and the roller length of the solid rollers may be longer than that of the hollow rollers. Further, the roller diameter of the solid roller may be larger than that of the hollow roller, and further, the roller length and roller diameter of the solid roller may be larger than that of the hollow roller.

  Next, a double row self-aligning roller bearing 41 according to another embodiment of the present invention will be described with reference to FIG.

  The double-row self-aligning roller bearing 41 includes an inner ring 42 having an intermediate flange 47, an outer ring 43, double-row spherical rollers 44 and 45, and a cage 46 provided for each row. The outer ring 43 includes two divided outer rings 43a and 43b arranged in the axial direction. Both the split outer rings 43a and 43b are provided such that a gap d is formed between them in a state where the raceway surfaces of both split outer rings are located on the same spherical surface.

  Further, the pressurizing means 48 applies the pressurizing pressure so that the gap d between the split outer rings 43a and 43b on both sides is narrowed. At this time, it is preferable to apply pressure from the side of the spherical roller 44 having a short roller length.

  As described above, by applying a pressure to the outer ring 43, it is possible to positively suppress the sliding of the spherical roller 44 having a short roller length.

  As the pressurizing application means 48, for example, a spring member, a tightening screw, or the like can be used. When using a spring member, for example, the compression spring is disposed so as to be in contact with the end face of the outer ring 43a at a plurality of locations in the circumferential direction.

  In the embodiment of FIG. 6, an example of a double-row self-aligning roller bearing in which the left and right rows have different roller lengths is shown, but the present invention is not limited to this, and the left and right rows have different roller diameters. The present invention may be applied to a row self-aligning roller bearing, or may be applied to a double row self-aligning roller bearing in which one of the left and right rows is a solid roller and the other is a hollow roller.

  In each of the above-described embodiments, the inner ring has a middle collar. However, the present invention is not limited to this, and the inner ring may not have a middle collar, or has a guide ring guided by the inner ring or the outer ring. It is good.

  In each of the above embodiments, the spherical roller is a symmetric roller, but an asymmetric roller may be used. When asymmetrical rollers are used, an induced thrust load is generated when the double row spherical roller bearing receives a load, and the spherical roller is pressed against the center. , Skew can be suppressed.

  7 and 8 show an example of a main shaft support structure of a wind power generator to which a double row spherical roller bearing according to an embodiment of the present invention as shown in FIGS. 3 to 6 is applied. The casing 53 of the nacelle 52 that supports the main components of the main shaft support structure is installed on the support base 50 via a swivel bearing 51 at a high position so as to be horizontally rotatable. The main shaft 56 holding the blade 57 at one end is rotatably supported in a casing 53 of the nacelle 52 via a main shaft support bearing 55 incorporated in a bearing housing 54. The other end of the main shaft 56 is connected to a speed increaser 58, and the output shaft of the speed increaser 58 is coupled to the rotor shaft of the generator 59. The nacelle 52 is turned at an arbitrary angle by the turning motor 60 via the speed reducer 61.

  In the illustrated embodiment, two main shaft support bearings 55 are installed side by side, but may be one. As the main shaft support bearing 55, a double-row self-aligning roller bearing according to an embodiment of the present invention is used. In this case, since a large load is applied to the spherical rollers in the row far from the blade 57, spherical rollers having a long roller length are used. Since only radial load is mainly applied to the spherical rollers in the row closer to the blade 57, spherical rollers having a short roller length are used.

  In the above embodiment, the roller diameter of the spherical roller in the row farther from the blade 57 may be larger than the spherical roller in the row closer to the blade 57, or the spherical roller in the row farther from the blade 57. May be solid rollers, and the spherical rollers in the row closer to the blade 57 may be hollow rollers.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to the thing of embodiment shown in figure. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention.

  The present invention is advantageously used for a double-row self-aligning roller bearing used in an environment where uneven loads are applied to the left and right rows and a main shaft support structure of a wind power generator equipped with such a bearing.

It is sectional drawing which shows the prior art example of the spindle support bearing of a wind power generator. It is sectional drawing which shows the prior art example of the double row self-aligning roller bearing which made roller length differ in the right and left row | line | column. It is a double row self-aligning roller bearing which concerns on one Embodiment of this invention, Comprising: It is a figure which shows the state which made the roller angle different in the right and left row | line, and made the contact angle the same in the right and left row | line. It is a double row self-aligning roller bearing which concerns on other embodiment of this invention, Comprising: It is a figure which shows the state which made the roller angle different in the right and left row | line, and made the contact angle the same in the right and left row | line. It is a figure which shows the spherical roller which is a spherical roller used for the double row automatic center roller bearing which concerns on other embodiment of this invention, and has a through-hole penetrated in the both end surfaces. It is a double row self-aligning roller bearing which concerns on other embodiment of this invention, Comprising: It is a figure which shows the state which divided | segmented the outer ring | wheel and gave the pressurization from one side of the bearing. It is a figure which shows an example of the spindle support structure of the wind power generator using the double row self-aligning roller bearing which concerns on this invention. FIG. 7 is a schematic side view of the main shaft support structure of the wind power generator shown in FIG. 6.

Explanation of symbols

1, 11, 21, 31, 41 Double row spherical roller bearings, 11a, 21a, 31a Bearing left row, 11b, 21b, 31b Bearing right row, 2 Wind generator main shaft, 3 blades, 4 housings, 5, 12 , 22, 32, 42 Inner ring, 6, 13, 23, 33, 43 Outer ring, 13a Outer ring raceway surface, 43a, 43b Split outer ring, 7, 8, 14, 15, 24, 25, 34, 35, 44, 45, 70 spherical rollers, 24a, 25a, 72, 73 spherical roller end faces, 16, 26, 36, 46 cages, 27, 37, 47 intermediate flanges, 27a, 27b intermediate flange sides, 48 pressurizing means, 50 support bases, 51 slewing bearing, 52 nacelle, 53 casing, 54 bearing housing, 55 spindle support bearing, 56 spindle, 57 blade, 58 speed increaser, 59 generator, 60 turning motor, 61 reduction Speed machine, 71 through hole.

Claims (7)

In a double-row spherical roller bearing comprising an inner ring, an outer ring, and spherical rollers having different load capacities in left and right rows between the inner ring and the outer ring,
A double row self-aligning roller bearing characterized in that the contact angles of the left and right rows are the same.   The double row spherical roller bearing according to claim 1, wherein the spherical rollers have different roller lengths in the left and right rows.   The double-row spherical roller bearing according to claim 1 or 2, wherein the spherical rollers have different roller diameters in the left and right rows.   4. The double row spherical roller bearing according to claim 1, wherein one of the spherical rollers is a solid roller in the left and right rows and the other is a hollow roller. 5.   The double-row self-aligning roller bearing according to any one of claims 1 to 4, wherein the inner ring has a middle collar.   The double-row spherical roller bearing according to any one of claims 1 to 5, wherein the spherical roller is an asymmetric roller in which a maximum diameter position of the roller does not exist in the center in the length direction of the roller. A blade that receives wind,
One end of which is fixed to the blade and rotates with the blade;
In the main shaft support structure of a wind power generator, which is incorporated in a fixed member and includes a double-row self-aligning roller bearing that rotatably supports the main shaft,
The double row spherical roller bearing includes an inner ring, an outer ring, and spherical rollers having different load capacities in the left and right rows,
The double-row self-aligning roller bearing has a main shaft support structure for a wind power generator, wherein the left and right rows have the same contact angle.

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