JP5808548B2 - Rolling bearing and wind power generator - Google Patents

Description

  The present invention relates to a rolling bearing and a wind turbine generator, and more particularly to a wear monitoring technique for a rolling bearing used in a wind turbine generator.

  Japanese Patent Laying-Open No. 2010-159710 (Patent Document 1) discloses a monitoring device that monitors the state of a main shaft bearing of a wind turbine generator. This monitoring device uses a load detection means for detecting a load applied to the spindle bearing and a detection signal from the load detection means as one piece of determination information, for example, a predetermined determination regarding the spindle bearing, for example, determination of a maintenance necessary time. Determination means for performing

  According to this monitoring device, since fluctuations in load load, which is a characteristic of the main shaft bearing of the wind turbine generator, are monitored, it is possible to accurately determine the prediction of the maintenance required time of the main shaft bearing (Patent Literature). 1).

  As a wind power generator, a so-called directly connected wind power generator in which rotation of a blade (blade) is directly transmitted to a generator without providing a speed increasing mechanism is known (for example, Patent Documents 2 and 3). reference). In such a directly connected wind power generator, the blades and the rotor of the generator are supported by a common bearing. The rotor needs to be close to the stator of the generator in order to improve power generation efficiency.

JP 2010-159710 A Special table 2003-510492 gazette JP 2010-116925 A

  When wear on the inner ring raceway surface, outer ring raceway surface or rolling element due to poor lubrication occurs on the rolling bearing, if the amount of wear increases, the position of the rotating body supported by the bearing is in a direction perpendicular to the rotation axis (diameter Direction, radial direction). Here, in the wind power generator, in particular, in order to increase the power generation efficiency, the rotor is disposed close to the stator in the generator. Therefore, when the rotor fluctuates in the radial direction due to internal wear of the bearing, the rotor contacts the stator and the generator is damaged, which may cause a fatal failure to the wind power generator. In particular, in a directly connected wind power generator as described above, a large generator is used compared to a speed increasing wind power generator provided with a speed increasing gear on the input side of the power generator. The forehead will be large.

  The monitoring device disclosed in Patent Document 1 determines a bearing abnormality by including a load detection unit and a determination unit, but does not have a function of detecting wear inside the bearing.

  Therefore, an object of the present invention is to provide a rolling bearing capable of detecting internal wear of the bearing and a wind turbine generator having the rolling bearing.

  According to this invention, the rolling bearing is a rolling bearing used for a wind power generator, and includes an inner ring and an outer ring, a plurality of rolling elements, and a displacement detection device. The plurality of rolling elements are interposed between the inner ring and the outer ring. The displacement detection device detects a displacement in the other radial direction with respect to one of the inner ring and the outer ring. The displacement detection device includes a plurality of detection units. The plurality of detection units are arranged with their positions shifted in a direction along the circumference.

  Preferably, the plurality of detection units include two displacement sensors arranged with a shift of approximately 90 degrees in a direction along the circumference.

  More preferably, the plurality of detection units further include two displacement sensors respectively disposed in the direction along the rotation axis with respect to the two displacement sensors.

Preferably, each displacement sensor is an eddy current displacement sensor.
Preferably, each of the plurality of detection units includes a proximity switch fixed to one of the inner ring and the outer ring and detecting the proximity of the other of the inner ring and the outer ring.

  Preferably, the rolling bearing further includes a control device. The control device calculates a displacement based on detection signals from a plurality of detection units, and generates an alarm when the calculated displacement exceeds a predetermined threshold value.

  More preferably, the rolling bearing further includes a wireless transmission unit and a power generation unit. The wireless transmission unit wirelessly transmits detection signals from the plurality of detection units to the outside of the rolling bearing. The power generation unit generates operating power for the wireless transmission unit.

  More preferably, the rolling bearing further includes a power storage device. The power storage device stores the power generated by the power generation unit.

  Moreover, according to this invention, a wind power generator is provided with a braid | blade, a main axis | shaft, a generator, and a rolling bearing. The blade receives wind power. The main shaft is connected to the blade. The generator receives power from the main shaft and generates power. The rolling bearing supports the main shaft. The rolling bearing includes an inner ring and an outer ring, a plurality of rolling elements, and a displacement detection device. The plurality of rolling elements are interposed between the inner ring and the outer ring. The displacement detection device detects a displacement in the other radial direction with respect to one of the inner ring and the outer ring. The displacement detection device is disposed with a position shifted in a direction along the circumference.

  Preferably, the generator includes a rotor and a stator. The rotor is directly connected to the main shaft.

  According to the present invention, since the plurality of detection units arranged with their positions shifted in the direction along the circumference detects the radial displacement of the other of the inner ring and the outer ring, the internal wear of the bearing is detected. A possible rolling bearing and a wind power generator including the same can be provided.

It is sectional drawing which shows roughly the whole structure of the wind power generator by Embodiment 1 of this invention. It is sectional drawing of the bearing shown in FIG. It is sectional drawing of the cross section III of the bearing shown in FIG. It is a functional block diagram of the control apparatus shown in FIG. FIG. 4 is a cross-sectional view of a bearing in a second embodiment. It is a functional block diagram of the control apparatus shown in FIG. FIG. 10 is a cross-sectional view perpendicular to the rotation axis of a bearing in the third embodiment. FIG. 10 is a cross-sectional view perpendicular to the rotation axis of a bearing in the fourth embodiment. FIG. 10 is a cross-sectional view of a bearing in a fifth embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

[Embodiment 1]
1 is a cross-sectional view schematically showing an overall configuration of a wind turbine generator according to Embodiment 1 of the present invention. With reference to FIG. 1, the wind turbine generator 10 includes a main shaft 20, a blade 30, a generator 40, a nacelle 50, a bearing 60, and a tower 90. The generator 40 includes a rotor 70 and a stator 80.

  The main shaft 20 is configured integrally with the rotor of the generator 40 and is rotatably supported by a bearing 60. The main shaft 20 transmits the rotational torque generated by the blade 30 that receives wind force to the generator 40. The blade 30 is provided at the tip of the main shaft 20 and converts wind force into rotational torque and transmits it to the main shaft 20. The generator 40 generates electric power by the rotational torque received from the main shaft 20. The generator 40 is constituted by, for example, an induction generator.

  The bearing 60 is fixed to the nacelle 50, and rotatably supports the rotor (main shaft 20) of the generator 40. The bearing 60 is constituted by a rolling bearing, for example, a double row tapered roller bearing, a double row cylindrical roller bearing, or a self-aligning roller bearing.

  The rotor 70 of the generator 40 is fixed to a rotor that rotates integrally with the main shaft 20. The stator 80 of the generator 40 is fixed to the nacelle 50. The rotor 70 and the stator 80 are disposed close to each other in order to increase the power generation efficiency of the generator 40. The nacelle 50 is supported by the tower 90.

  FIG. 2 is a cross-sectional view of the bearing 60 shown in FIG. Referring to FIG. 2, bearing 60 includes an inner ring 110, an outer ring 120, a rolling element 130, a displacement sensor 140 </ b> A, and a control device 150. As described above, the type of the bearing 60 is not particularly limited. Hereinafter, a case where the bearing 60 is configured by an outward double-row tapered roller bearing will be representatively described.

  The inner ring 110 is fitted with the rotor (or the main shaft 20) of the generator 40 (FIG. 1). The outer ring 120 is fixed to the nacelle 50 (FIG. 1). A plurality of rolling elements 130 are interposed between the inner ring 110 and the outer ring 120. The rolling elements 130 are arranged at equal intervals in the direction along the circumference, and are arranged between the inner ring 110 and the outer ring 120 in two sets of rows.

  The displacement sensor 140A is a sensor for detecting a displacement in the radial direction (radial direction) of the inner ring 110 with respect to the outer ring 120 which is a stationary wheel. The displacement sensor 140A is fixed to the outer ring 120, and is installed, for example, in an oil hole provided in the outer ring spacer. The displacement sensor 140A outputs a signal that changes according to the distance from the inner ring 110. The displacement sensor 140A is preferably resistant to an environment filled with lubricating oil, lubricating grease, or the like. For example, an eddy current type having high environmental resistance is used. Various known eddy current type displacement sensors can be used.

  Based on the detection signal of the displacement sensor 140A, the control device 150 performs software processing by executing a program stored in advance by a CPU (Central Processing Unit) and / or hardware processing by a dedicated electronic circuit. The relative displacement in the radial direction of the inner ring 110 is calculated. And the control apparatus 150 will output the warning for alert | reporting the increase in the amount of wear of the bearing 60, if the calculated relative displacement exceeds the preset threshold value. In addition, the control apparatus 150 is arrange | positioned in the nacelle 50 (FIG. 1), for example.

  Note that the displacement of the rotor in the horizontal direction relative to the displacement sensor 140A cannot be detected by the displacement sensor 140A alone. In the first embodiment, the displacement sensor 140A is at a position shifted by 90 ° in the direction along the circumference. Furthermore, a displacement sensor is provided.

  3 is a cross-sectional view of section III of bearing 60 shown in FIG. Referring to FIG. 3, displacement sensor 140B is disposed at a position shifted from displacement sensor 140A by 90 ° in the direction along the circumference. The displacement sensor 140B is also fixed to the outer ring 120, for example, in an oil hole provided in the outer ring spacer. Displacement sensor 140B also outputs a signal that changes according to the distance from inner ring 110 to control device 150 (FIG. 2). For example, an eddy current type is also used for the displacement sensor 140B.

  FIG. 4 is a functional block diagram of the control device 150 shown in FIG. Referring to FIG. 4, control device 150 includes a relative displacement calculation unit 210 and an alarm output unit 220. The relative displacement calculator 210 receives the detection signal S1 from the displacement sensor 140A and the detection signal S2 from the displacement sensor 140B. The relative displacement calculator 210 calculates the displacement between the displacement sensor 140A and the inner ring 110 based on the detection signal S1. Further, the relative displacement calculation unit 210 calculates the displacement between the displacement sensor 140B and the inner ring 110 based on the detection signal S2. Then, the relative displacement calculation unit 210 calculates the relative displacement in the radial direction of the inner ring 110 with respect to the outer ring 120 based on the calculated displacement between the displacement sensor 140A and the inner ring 110 and the displacement between the displacement sensor 140B and the inner ring 110. Is calculated.

  The alarm output unit 220 receives the calculated value of the relative displacement in the radial direction of the inner ring 110 with respect to the outer ring 120 from the relative displacement calculation unit 210. Then, the alarm output unit 220 compares the calculated value of the received relative displacement with a preset threshold value, and when the relative displacement exceeds the threshold value, the amount of wear of the bearing 60 is increased. Output an alarm.

  As described above, in the first embodiment, the displacement in the radial direction of the inner ring 110 with respect to the outer ring 120 is detected by the displacement sensors 140A and 140B that are arranged with their positions shifted in the direction along the circumference. Thereby, the internal wear of the bearing 60 is detected. When the radial displacement of the inner ring 110 with respect to the outer ring 120 exceeds a threshold value, an alarm is output on the assumption that the amount of wear of the bearing 60 has increased. Therefore, according to this Embodiment 1, it can prevent that the fatal damage of the wind power generator 10 called the contact of the rotor 70 and the stator 80 of the generator 40 generate | occur | produces.

[Embodiment 2]
As described above, particularly in a direct-coupled wind power generator, a large generator is often used as compared with a wind power generator equipped with a speed increasing mechanism, and the rotor and the stator are also in a direction along the rotation axis. It will be long. In this case, if a relative angle of the rotation axis of the inner ring with respect to the rotation axis of the outer ring occurs, the rotor contacts the stator and the generator is damaged, which may cause a fatal failure of the wind power generator. Therefore, in the second embodiment, two displacement sensors are provided at intervals in the direction along the rotation axis with respect to the displacement sensors 140A and 140B (FIG. 3). As a result, the relative angle of the rotation axis of the inner ring with respect to the rotation axis of the outer ring can also be measured, and an alarm is output when the relative angle exceeds a predetermined set value.

  FIG. 5 is a cross-sectional view of bearing 60A in the second embodiment. Referring to FIG. 5, bearing 60A includes an inner ring 310, an outer ring 320, rolling elements 330, displacement sensors 340A and 342A, and a control device 150A. In the second embodiment, the type of the bearing 60A is not particularly limited. However, in the following, as in the first embodiment, the bearing 60A is configured by an outward double-row tapered roller bearing. Will be described representatively.

  The rotor (or main shaft 20) of the generator 40 (FIG. 1) is fitted into the inner ring 310. The outer ring 320 is fixed to the nacelle 50 (FIG. 1). The plurality of rolling elements 330 are interposed between the inner ring 310 and the outer ring 320.

  The displacement sensor 340A is a sensor for detecting a displacement in the radial direction (radial direction) of the inner ring 310 with respect to the outer ring 320 which is a stationary wheel. The displacement sensor 340A is fixed to the outer ring 320. Displacement sensor 340A outputs a signal that changes according to the distance from inner ring 310.

  The displacement sensor 342A is also a sensor for detecting displacement in the radial direction (radial direction) of the inner ring 310 with respect to the outer ring 320. The displacement sensor 342A is fixed to the outer ring 320 at an interval in the direction along the rotation axis with respect to the displacement sensor 340A. The displacement sensor 342A also outputs a signal that changes according to the distance from the inner ring 310.

  Although not particularly illustrated, a displacement sensor is further provided at a position shifted by 90 ° from the displacement sensor 340A in the direction along the circumference, as in the first embodiment. Furthermore, a displacement sensor is further provided at a position shifted by 90 ° from the displacement sensor 342A in the direction along the circumference.

  The control device 150A calculates the relative displacement in the radial direction of the inner ring 310 with respect to the outer ring 320 based on the detection signal of each displacement sensor. Further, control device 150A calculates the relative angle of the rotation axis of inner ring 310 with respect to the rotation axis of outer ring 320 based on the detection signal of each displacement sensor. When the calculated relative displacement exceeds a preset threshold value or the calculated relative angle exceeds a preset threshold value, the control device 150A increases the wear amount of the bearing 60A. An alarm for notifying is output. The control device 150A is also disposed in the nacelle 50 (FIG. 1), for example.

  FIG. 6 is a functional block diagram of control device 150A shown in FIG. Referring to FIG. 6, control device 150 </ b> A includes a relative displacement calculation unit 210 </ b> A, an alarm output unit 220 </ b> A, and a relative angle calculation unit 230.

  The relative displacement calculation unit 210A calculates the displacement between the displacement sensor 340A and the inner ring 310 based on the detection signal S1 of the displacement sensor 340A. The relative displacement calculation unit 210A is based on a detection signal S3 of a displacement sensor 340B (not shown) disposed at a position shifted by 90 ° from the displacement sensor 340A in the direction along the circumference. The displacement between the inner ring 310 and the inner ring 310 is calculated. Then, the relative displacement calculation unit 210A is configured so that the radial displacement of the inner ring 310 relative to the outer ring 320 is based on the calculated displacement between the displacement sensor 340A and the inner ring 310 and the displacement between the displacement sensor 340B and the inner ring 310. Is calculated.

  The relative displacement calculator 210A detects the detection signal S2 of the displacement sensor 342A and the detection signal of a displacement sensor 342B (not shown) disposed at a position shifted by 90 ° from the displacement sensor 342A in the direction along the circumference. Based on S4, the radial relative displacement of the inner ring 310 with respect to the outer ring 320 is calculated.

  The relative angle calculation unit 230 calculates the displacement between the displacement sensor 340A and the inner ring 310 based on the detection signal S1 of the displacement sensor 340A. Further, the relative angle calculation unit 230 calculates the displacement between the displacement sensor 342A and the inner ring 310 based on the detection signal S2 of the displacement sensor 342A. Furthermore, the relative angle calculation unit 230 calculates the displacement between the displacement sensor 340B and the inner ring 310 based on the detection signal S3 of the displacement sensor 340B. Furthermore, the relative angle calculation unit 230 calculates the displacement between the displacement sensor 342B and the inner ring 310 based on the detection signal S4 of the displacement sensor 342B.

  The relative angle calculation unit 230 calculates the displacement between the displacement sensor 340A and the inner ring 310, the displacement between the displacement sensor 342A and the inner ring 310, the displacement between the displacement sensor 340B and the inner ring 310, and the displacement. Based on the displacement between the sensor 342B and the inner ring 310, the relative angle of the rotation axis of the inner ring 310 with respect to the rotation axis of the outer ring 320 is calculated.

  The alarm output unit 220A receives the calculated value of the relative displacement in the radial direction of the inner ring 310 with respect to the outer ring 320 from the relative displacement calculation unit 210A. The alarm output unit 220 </ b> A receives a calculated value of the relative angle of the rotation axis of the inner ring 310 with respect to the rotation axis of the outer ring 320 from the relative angle calculation unit 230. Then, the alarm output unit 220A compares the calculated value of the received relative displacement with a preset threshold value, and if the relative displacement exceeds the threshold value, it is assumed that the wear amount of the bearing 60A has increased. Is output. Also, the alarm output unit 220A compares the calculated value of the received relative angle with a preset threshold value, and if the relative angle exceeds the threshold value, the alarm is given that the amount of wear of the bearing 60A has increased. Is output.

  As described above, in the second embodiment, the relative angle of the rotation axis of the inner ring 310 with respect to the rotation axis of the outer ring 320 is calculated. Thereby, internal wear of bearing 60A is detected. When the relative angle exceeds the threshold value, an alarm is output on the assumption that the amount of wear of the bearing 60A has increased. Therefore, according to this Embodiment 2, it can prevent more reliably that the fatal damage of the wind power generator 10 called the contact of the rotor 70 and the stator 80 of the generator 40 generate | occur | produces.

[Embodiment 3]
In the third embodiment, a wireless transmitter is provided in the bearing, and a detection signal of the displacement sensor is wirelessly transmitted from the wireless transmitter to the control device. Thereby, the wiring between a displacement sensor and a control apparatus can be made unnecessary.

  FIG. 7 is a cross-sectional view perpendicular to the rotation axis of the bearing in the third embodiment. Referring to FIG. 7, bearing 60 </ b> B further includes power generation unit 160, power storage device 170, and wireless transmission unit 180 in the configuration of bearing 60 in the first embodiment.

  Power generation unit 160, power storage device 170, and wireless transmission unit 180 are provided, for example, in the outer ring spacer of bearing 60B. The power generation unit 160 generates power by the rotation of the inner ring 110. For example, by providing a pulsar ring that rotates with the inner ring 110 and alternately has different magnetic characteristics in the direction along the circumference, and the power generation unit 160 is configured by a coil, an electromagnetic induction current is generated by the rotation of the inner ring 110 can do.

  The power storage device 170 is configured by a secondary battery, a capacitor, or the like. The electric power generated by the power generation unit 160 is rectified by a rectifier (not shown) and stored in the power storage device 170. Then, power storage device 170 supplies the stored power to displacement sensors 140A and 140B and wireless transmission unit 180. Radio transmitter 180 receives the detection signals of displacement sensors 140A and 140B and transmits the received detection signals to control device 150 (FIG. 2) by radio.

  In the above description, the case where the configuration of the bearing 60 in the first embodiment further includes the power generation unit 160, the power storage device 170, and the wireless transmission unit 180 has been described. However, the configuration of the bearing 60A in the second embodiment. The power generation unit 160, the power storage device 170, and the wireless transmission unit 180 may be further included.

  As described above, according to the third embodiment, wiring between the displacement sensors 140A and 140B and the control device 150 can be made unnecessary.

[Embodiment 4]
Instead of the displacement sensors 140A and 140B (displacement sensors 340A, 340B, 342A, and 342B in the second embodiment), proximity switches may be used.

  FIG. 8 is a cross-sectional view perpendicular to the rotation axis of the bearing in the fourth embodiment. Referring to FIG. 8, bearing 60C includes proximity switches 410A to 410D in place of displacement sensors 140A and 140B in the configuration of bearing 60 in the first embodiment.

  Proximity switches 410A to 410D are provided, for example, in outer ring spacers, and are fixed at equal intervals in a direction along the circumference of outer ring 120 that is a stationary ring. Each of the proximity switches 410A to 410D detects the proximity of the inner ring 110.

  As the proximity switches 410A to 410D, for example, a contact type touch switch, a reflective photoelectric sensor, a proximity sensor, an ultrasonic sensor, or the like can be used. The contact-type touch switch is of a type in which a protrusion is attached to the tip of a rod-shaped sensor, and the protrusion is pushed in and sensed when an object approaches. The reflective photoelectric sensor is of a type in which laser light is output from the tip of the sensor, and when an object enters within a detection distance, the laser light is received by the light receiving portion at the tip of the sensor to detect approach. The proximity sensor generates a high-frequency magnetic field by flowing a high-frequency current through a detection coil provided in the sensor head, and generates an eddy current on the surface of the measurement object (metal). Since the eddy current changes depending on the distance to the object, proximity can be detected by changing the impedance of the detection coil and changing the oscillation of the high-frequency current. The ultrasonic sensor detects ultrasonic waves from a sensor head, detects an approach from a time until it is reflected by a measurement object and received by the sensor head.

  Note that the proximity switches 410A to 410D are for detecting the proximity of the inner ring 110 and not for measuring the distance to the inner ring 110. Therefore, unlike the displacement sensors 140A and 140B, the proximity switches 410A to 410D are arranged along the circumference. It is necessary to provide a large number (four at regular intervals in FIG. 8) in the other direction.

  Although not particularly illustrated, the configuration of the bearing 60A according to the second embodiment includes proximity switches 410A to 410D instead of the displacement sensors 340A and 340B disposed by being shifted by 90 ° in the direction along the circumference. Instead of the sensors 342A and 342B, proximity switches 410E to 410H disposed in directions along the rotation axis with respect to the proximity switches 410A to 410D may be included.

  Further, although not particularly illustrated, similarly to the third embodiment, a wireless transmission unit, a power generation unit, and a power storage device for transmitting detection signals of the respective displacement sensors to the control device may be further provided.

  As described above, according to the fourth embodiment, the same effects as in the first to third embodiments can be obtained.

[Embodiment 5]
In each of the above embodiments, the case where the bearing is constituted by a double row tapered roller bearing has been representatively described. However, in Embodiment 5, the case where the bearing is constituted by a single row type is described. An example is shown.

  FIG. 9 is a cross-sectional view of the bearing in the fifth embodiment. Referring to FIG. 9, bearing 60D includes an inner ring 510, an outer ring 520, a rolling element 530, and displacement sensors 540A and 540B. The type of the bearing is not particularly limited, but in the fifth embodiment, a case where the bearing 60D is constituted by a deep groove ball bearing will be described as a representative example.

  The displacement sensors 540A and 540B are fixed to the outer ring 520 that is a stationary ring. The displacement sensor 540B is disposed in a direction along the rotation axis with the rolling element 530 interposed therebetween with respect to the displacement sensor 540A.

  Although not particularly illustrated, a displacement sensor is further provided at a position shifted by 90 ° from the displacement sensor 540A in the direction along the circumference. Further, a displacement sensor is further provided at a position shifted by 90 ° in the direction along the circumference from the displacement sensor 540B.

  Although not particularly illustrated, as described in the third embodiment, a wireless transmission unit, a power generation unit, and a power storage device for transmitting detection signals of the respective displacement sensors to the control device may be further provided. Further, as described in the fourth embodiment, a proximity switch may be used instead of the displacement sensor.

  As described above, according to the fifth embodiment, the same effects as in the first to fourth embodiments can be obtained.

  In each of the above embodiments, the outer ring is a stationary wheel and the inner ring is a rotating wheel, but the inner ring may be a stationary wheel and the outer ring may be a rotating wheel.

  Further, the numbers of displacement sensors and proximity switches described above are merely examples, and are not limited to the numbers shown in the above embodiments.

  In the first to fourth embodiments, the bearing is an outward double-row tapered roller bearing. In the fifth embodiment, the bearing is typically described as a deep groove ball bearing. The format is not limited to these.

  In the above description, the wind power generation apparatus 10 is a direct connection type in which the rotation of the blade is directly transmitted to the generator without including the speed increasing mechanism. However, the scope of application of the present invention is the direct connection type wind power generation. It is not limited to a device, and includes a wind power generator having a speed increasing mechanism.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and is intended to include meanings equivalent to the scope of claims for patent and all modifications within the scope.

  10 wind power generator, 20 main shaft, 30 blade, 40 generator, 50 nacelle, 60, 60A-60D bearing, 70 rotor, 80 stator, 90 tower, 110, 310, 510 inner ring, 120, 320, 520 outer ring, 130, 330, 530 Rolling elements, 140A, 140B, 340A, 342A, 410A-410D, 540A, 540B Displacement sensor, 150, 150A Control device, 160 Power generation unit, 170 Power storage device, 180 Wireless transmission unit, 210, 210A Relative displacement Calculation unit, 220, 220A Alarm output unit, 230 Relative angle calculation unit.

Claims (11)

A rolling bearing used in a wind power generator,
An inner ring and an outer ring,
A plurality of rolling elements interposed between the inner ring and the outer ring;
A displacement detection device for detecting a displacement in the other radial direction with respect to one of the inner ring and the outer ring,
The displacement detector is
First and second displacement sensors disposed at different positions in a direction along the circumference;
Look including a third and a fourth displacement sensor being respectively arranged in a direction along the rotation axis relative to said first and second displacement sensors,
The rolling bearing is a single-row bearing in which the plurality of rolling elements are formed in a single row,
The third and fourth displacement sensors are rolling bearings respectively disposed in a direction along a rotation axis with the plurality of rolling elements interposed therebetween with respect to the first and second displacement sensors . A rolling bearing used in a wind power generator,
An inner ring and an outer ring,
A plurality of rolling elements interposed between the inner ring and the outer ring;
A displacement detection device for detecting a displacement in the other radial direction with respect to one of the inner ring and the outer ring,
The displacement detector is
First and second displacement sensors disposed at different positions in a direction along the circumference;
A third and a fourth displacement sensor respectively disposed in a direction along the rotation axis with respect to the first and second displacement sensors;
The rolling bearing is a double row type bearing in which the plurality of rolling elements are formed in a double row,
The first to fourth displacement sensors are rolling bearings disposed in a spacer of the double row type rolling bearing. 3. The rolling bearing according to claim 1, wherein the second and fourth displacement sensors are disposed so as to be shifted from the first and third displacement sensors by approximately 90 degrees in a direction along a circumference. 4. .   4. The rolling bearing according to claim 1, wherein each of the first to fourth displacement sensors is an eddy current displacement sensor. 5.   Each of the first to fourth displacement sensors includes a proximity switch that is fixed to one of the inner ring and the outer ring and detects the proximity of the other of the inner ring and the outer ring. A rolling bearing according to any one of the above.   The apparatus further comprises a control device that calculates the displacement based on detection signals from the first to fourth displacement sensors and generates an alarm when the calculated displacement exceeds a predetermined threshold value. The rolling bearing according to claim 5. A wireless transmission unit for wirelessly transmitting detection signals from the first to fourth displacement sensors to the outside of the rolling bearing;
The rolling bearing according to claim 6, further comprising a power generation unit that generates operating power of the wireless transmission unit.   The rolling bearing according to claim 7, further comprising a power storage device for storing electric power generated by the power generation unit. A blade that receives wind,
A main shaft connected to the blade;
A generator that generates power by receiving rotational force from the main shaft;
A rolling bearing for supporting the main shaft;
The rolling bearing is
An inner ring and an outer ring,
A plurality of rolling elements interposed between the inner ring and the outer ring;
A displacement detection device for detecting a displacement in the other radial direction with respect to one of the inner ring and the outer ring,
The displacement detector is
First and second displacement sensors disposed at different positions in a direction along the circumference;
Look including a third and a fourth displacement sensor being respectively arranged in a direction along the rotation axis relative to said first and second displacement sensors,
The rolling bearing is a single-row bearing in which the plurality of rolling elements are formed in a single row,
The third and fourth displacement sensors are wind power generators respectively disposed in a direction along a rotation axis with the plurality of rolling elements interposed therebetween with respect to the first and second displacement sensors . A blade that receives wind,
A main shaft connected to the blade;
A generator that generates power by receiving rotational force from the main shaft;
A rolling bearing for supporting the main shaft;
The rolling bearing is
An inner ring and an outer ring,
A plurality of rolling elements interposed between the inner ring and the outer ring;
A displacement detection device for detecting a displacement in the other radial direction with respect to one of the inner ring and the outer ring,
The displacement detector is
First and second displacement sensors disposed at different positions in a direction along the circumference;
A third and a fourth displacement sensor respectively disposed in a direction along the rotation axis with respect to the first and second displacement sensors;
The rolling bearing is a double row type bearing in which the plurality of rolling elements are formed in a double row,
The first to fourth displacement sensors are wind power generators arranged in a spacer of the double row type rolling bearing. The generator includes a rotor and a stator,
The wind power generator according to claim 9 or 10 , wherein the rotor is directly connected to the main shaft.

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