JP2005227298A - Rotator device and temperature checking method for rotator device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low-cost rotator device capable of detecting the temperature of the rotator, a rolling body or the like always and surely without requiring processing applied to a rotating shaft or the like. <P>SOLUTION: A bearing device 1 as the rotator device is equipped with an inner ring 2, an outer ring 3, the rolling body 4, a temperature detection part 5, a reception part 6 and a processing device 7. The temperature detection part 5 is mounted on the inner ring 2 and is equipped with a vibrator 12, a detection side coil 13 and a cable 14. Quartz is used as the vibrator 12. The reception part 6 is mounted on the outer ring 3 and is equipped with a reception side coil 16. The reception side coil 16 is connected to the processing device 7 through a cable 17. The coils 13, 16 are provided mutually oppositely. The processing device 7 supplies a power to the vibrator 12 through the coils 13, 16. The vibrator 12 is vibrated with a frequency corresponding to the temperature of the inner ring 2. A signal based on vibration of the vibrator 12 is inputted into the processing device 7. The processing device 7 determines whether the bearing device 1 is in a operation recommended range or not. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a rotating body device used for a machine tool, an aircraft, a railway vehicle, an industrial machine, and the like, and a temperature check method for the rotating body device.

  A bearing as a rotating body device that is used in a machine tool, an aircraft, a railway vehicle, an industrial machine, and the like, and includes a rotating body, a fixed body, and a rolling element that is provided between the fixed body and the rotating body so as to be able to roll freely. In order to prevent damage to rolling elements in the device, the temperature of the rotating body, fixed body, rolling element of this bearing device, and the cage that holds this rolling element between the fixed body and the rotating body are detected. There are things to do.

  Conventionally, when detecting the temperature of a fixed body of a bearing device, a temperature detector such as a thermocouple is attached to the fixed body, and a signal from the temperature detector is taken out via a signal line. On the other hand, when detecting the temperature of the rotating body, the above-mentioned temperature detector is attached to the rotating body, and a conductive slip ring attached to the rotating body or a telemeter device using frequency-modulated radio waves or light is used. The signal from the temperature detector is taken out.

  Also, it is extremely difficult to detect the temperature of the rolling element and cage of the bearing device, and the maximum temperature of the rolling element and cage is detected by applying thermal paper that changes color due to temperature changes or applying paint. doing.

  As described above, in order to take out a signal from the temperature detector of the rotating body, the method using the slip ring is provided with the slip ring at the end of the rotating shaft to which the bearing device is attached, and the signal described above is provided from this end. It is necessary to take out. For this reason, there is a restriction on the structure of the end of the rotating shaft, and it is necessary to provide a signal line or the like from the rotating body to the end of the rotating shaft, and it is provided along the axial direction of the rotating shaft in contact with the rotating body. It is necessary to process the spacer member and the rotating shaft.

  In the method using the telemeter device, it is necessary to attach the transmitter of the telemeter device to the rotating body, and it is necessary to provide a power source for supplying power to the transmitter. When a battery is used as the power source, it is necessary to stop using the bearing device once every time the battery is replaced. Even when radio waves are used, it is necessary to always supply power, and a power supply device as a power source is not preferable because it is expensive. Furthermore, the measurement temperature range is limited by the allowable temperature of these circuit components.

  Furthermore, in a telemeter device using light, a signal cannot be taken out if an object that shields light, such as lubricating oil of a bearing device, is interposed between the transmitter and the receiver.

  The temperature of the rotating body, rolling element, cage, etc. cannot always be detected by applying thermal paper that changes color due to temperature changes or applying paint.

  In addition, as described above, since it is difficult to always detect the temperature of the rotating body or the like, conventionally, in order to prevent damage to the rolling element or the like, a temperature detector such as a thermocouple is attached only to the fixed body, Only the temperature of the fixed body or only the temperature difference between the rotating body and the fixed body is checked to determine whether or not the bearing device is within the recommended operation range.

  Whether or not the bearing device is within the recommended operation range is determined only by the temperature of the fixed body. When the heat capacity of the fixed body is large, as shown in FIG. 16, the rotating body, the rolling element, the cage, etc. Even if the temperature rises rapidly, the temperature of the stationary body rises only relatively slowly, so that a sudden temperature rise of the rotating body cannot be detected. For this reason, it is not understood even if the bearing device deviates from the recommended operation range.

  Further, when it is determined whether or not the bearing device is within the recommended operating range based only on the temperature difference between the rotating body and the fixed body, the temperatures of the rotating body and the fixed body are the same as shown in FIG. When the temperature of the rotating body or the like exceeds the tempering temperature of the steel forming the bearing device or the use limit temperature of the lubricating oil, it cannot be detected. For this reason, it is not understood even if the bearing device deviates from the recommended operation range.

  The present invention has been made by paying attention to the above circumstances, and the object of the present invention is that it is not necessary to process the rotating shaft or the like, and the temperature of the rotating body or rolling element can be detected constantly and reliably. At the same time, it is to provide a low cost rotating body device.

  In order to solve the problems and achieve the object, a rotating body device according to a first aspect of the present invention includes a fixed body, a rotating body, and a rolling device provided between the fixed body and the rotating body so as to be freely rollable. In a rotating body device including a moving body, first temperature detecting means including a transmitter that detects a temperature of one of the rotating body and the rolling body and emits a signal corresponding to the temperature, and A receiving means having a receiver for receiving a signal emitted by a transmitter of the temperature detecting means, and the temperature of the rotating body or rolling element is within the recommended operating range of the rotating body device based on the signal received by the receiving means. And determining means for determining whether or not.

  In carrying out the first aspect of the invention, the first temperature detecting means may include a vibrator made of quartz. In order to achieve the object more reliably, it is desirable that the transmitter and the receiver are opposed to each other at least once during the rotation of the rotating body.

  In the rotating body device, the transmitter of the first temperature detecting means emits a signal corresponding to the detected temperature of the rotating body or rolling element, and the receiver of the receiving means receives this signal. Therefore, it is possible to reliably detect the temperature of the rotating body or the rolling element without having to take out the temperature signal.

  Further, if a temperature sensor is provided with an oscillator made of crystal, it is not necessary to use an expensive power supply device without using a battery as a power source for an oscillator or the like, so that the cost of the rotating body device itself can be suppressed. it can. Since the resonance frequency of the quartz crystal changes according to the temperature, it is possible to reliably extract a signal corresponding to the temperature of the rotating body.

  Furthermore, if the transmitter and the receiver are provided so as to face each other at least once during one rotation of the rotating body, the temperature of the rotating body or rolling element can be detected constantly and more reliably.

  According to the first aspect of the present invention, it is not necessary to take out the temperature signal via the signal line. Therefore, it is not necessary to process the rotating shaft or the like, and the temperature of the rotating body or rolling element can be detected reliably.

  In addition, when the first temperature detecting means includes a vibrator made of crystal, it is not necessary to use an expensive power supply device without using a battery as a power source for an oscillator or the like. For this reason, while being able to always detect the temperature of a rotary body or a rolling element, the cost of rotary body apparatus itself can be suppressed.

  Furthermore, when the transmitter and the receiver are opposed to each other at least once during one rotation of the rotating body, the temperature of the rotating body or the rolling element can be detected constantly and more reliably.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 and 2 show a first embodiment, FIG. 1 is a block diagram showing a configuration of a bearing device 1 as an example of a rotating body device according to the first embodiment of the present invention, and FIG. It is sectional drawing which expands and shows a part.

  As shown in FIG. 2, the bearing device 1 is a rolling bearing including an inner ring 2 that forms a rotating body, an outer ring 3 that forms a fixed body, a rolling element 4, and the like, and is attached to the inner ring 2 and has a first temperature. A temperature detection unit 5 as a detection unit, a reception unit 6 attached to the outer ring 3 and as a reception unit, and a processing device 7 connected to the reception unit 6 and as a determination unit are provided.

  The inner ring 2 is formed in an annular shape and is fixed to a rotating shaft 8 or the like, and rotates around the axis P of the rotating shaft 8 together with the rotating shaft 8. The outer ring 3 is formed in an annular shape having an inner diameter larger than the outer diameter of the inner ring 2. As the rolling element 4, a roller or ball made of metal or the like is used. The rolling element 4 is rotatably held between the inner ring 2 and the outer ring 3 by a retainer 9 or the like so that the rotation of the inner ring 2 described above is not transmitted to the outer ring 3.

  In addition, the inner ring 2 includes a detection unit mounting cut-out part 10 formed by cutting out a part of the inner ring 2. In the illustrated example, the detection unit mounting cut-out part 10 includes the outer peripheral surface of the inner ring 2 and the axis P direction. Is provided over the end along the line.

  The outer ring 3 is attached to a receiving part formed by cutting a part thereof at a position facing the detection part mounting notch 10 of the inner ring 2 at least once while the inner ring 2 makes one rotation around the axis P. A notch 11 is provided. In the example of illustration, the receiving part attachment notch part 11 is provided over the inner peripheral surface of the outer ring | wheel 3, and the edge part along the said axis line P direction.

  The temperature detection unit 5 includes a vibrator 12, a detection side coil 13 as a transmitter, a cable 14 that connects the vibrator 12 and the detection side coil 13 to each other, and the like. Quartz is used as the vibrator 12.

  The vibrator 12 is provided in contact with the inner ring 2, and its temperature follows the temperature of the inner ring 2 by heat transfer from the inner ring 2. The vibrator 12 is excited through the cable 14 so that it vibrates at a frequency depending on the temperature of the inner ring 2. For example, the vibration frequency of the vibrator 12 increases as the temperature of the inner ring 2 increases.

  The detection side coil 13 is provided exposed on the outer peripheral surface side of the inner ring 2. The detection-side coil 13 as a transmitter has a function of receiving a variable-frequency radio wave from a later-described reception-side coil 16 and transmitting a resonance-frequency radio wave from the vibrator 12.

  In addition, the temperature detection unit 5 is in a state where the vibrator 12, the detection side coil 13, and the cable 14 are surrounded by a detection side coil protection unit 15 made of non-magnetic and insulating plastic resin, ceramic, or the like. It is mounted in the detection unit mounting cutout 10.

  The receiving unit 6 includes a receiving coil 16 as a receiver. The receiving side coil 16 is exposed at the inner peripheral surface side of the outer ring 3 and is provided at a position facing the detection side coil 13 of the inner ring 2 at least once while the inner ring 2 makes one rotation around the axis P. The receiving coil 16 as a receiver has a function of oscillating a variable frequency radio wave that excites the vibrator 12 and receiving a resonance frequency from the vibrator 12. A cable 17 is connected to the receiving coil 16. This cable 17 is connected to the processing device 7.

  In addition, the receiving unit 6 includes the receiving unit mounting notch in a state where the receiving side coil 16 and the cable 17 are surrounded by a receiving side coil protection unit 18 made of non-magnetic and insulating plastic resin, ceramic, or the like. It is mounted in the part 11.

  The receiving side coil 16 emits radio waves of variable frequency and is received by the detecting side coil 13 to excite the crystal unit 12. The detection side coil 13 is configured to transmit a signal corresponding to the vibration frequency of the vibrator 12 to the reception side coil 16 that is generated when the vibrator 12 vibrates.

  When the temperature detector 5 and the receiver 6 are mounted in the notches 10 and 11, the protective portions 15 and 18 may be press-fitted together or fixed to the inner ring 2 and the outer ring 3 with an adhesive or the like. You may fix using etc.

  The processing device 7 is an arithmetic device having a CPU or the like. As shown in FIG. 1, the processing device 7 includes a transmission / reception unit 20, an amplification unit 21, a frequency detection unit 22, a temperature conversion unit 23, and a determination unit 24. I have.

  The transmission / reception unit 20 includes a transmitter 25, a receiver 26, and a switching unit 27. The transmitter 25 and the receiver 26 are each connected to the receiving coil 16. The switching unit 27 is connected to the transmitter 25 and the receiver 26. The receiver 26 is connected to the amplification unit 21.

  The switching unit 27 supplies power for exciting the crystal resonator 12 to the reception side coil 16 via the transmitter 25, and when the receiver 26 vibrates the transducer 12, the detection side coil 13 is switched to the case of receiving a signal originating from 13 and transmitted via the receiving side coil 16.

  The receiver 26 outputs a signal according to the vibration frequency of the vibrator 12 transmitted through the coils 13, 16 and the like toward the amplification unit 21.

  The amplifying unit 21 is connected to the receiver 26 and includes a level determining unit 28 and a signal amplifying unit 29. The level determination unit 28 determines whether or not the signal output from the signal amplification unit 29 exceeds a predetermined threshold value, and the threshold value is set from the outside. It is desirable that the threshold value be a value that can distinguish the amplitude of the signal amplified by the signal amplifier 29 when the vibrator 12 made of crystal or the like is oscillated from noise.

  The signal amplifying unit 29 is connected to the receiver 26, and outputs the signal determined by the level determining unit 28 that the signal output from the receiver 26 exceeds the threshold value to the switching unit 27. . In response to this signal, the switching unit 27 outputs the output of the transmitter 25 to the gate unit 31.

  This is because only when the variable frequency sent from the transmitter 25 to the vibrator 12 via the receiving coil 16 coincides with the resonance frequency corresponding to the temperature of the vibrator 12, the resonance frequency is detected from the vibrator 12 on the detection side. It is received as a radio wave by the receiving side coil 16 via the coil 13, and this radio wave usually disappears in a short time.

  Therefore, when this radio wave is determined by the level determination unit 28 to exceed a predetermined threshold value, it becomes a pulse and is input to the gate unit 31 described later. At the same time, since this resonance frequency is equal to the variable frequency transmitted from the transmitter 25 to the vibrator 12, this signal is also input to the gate unit 31.

  In the gate unit 31, a pulse having a width equal to the storage time of the reference time storage unit 30 is generated from the signal from the level determination unit 28, and AND of the pulse and the signal obtained by pulsing the signal from the transmitter 25 is obtained. To the counter unit 32.

  The frequency detection unit 22 includes a reference time storage unit 30, a gate unit 31, and a counter unit 32. The reference time storage unit 30 is connected to the gate unit 31 and stores a reference time when the counter unit 32 detects the frequency of the signal. The reference time storage unit 30 outputs the above-described reference time toward the gate unit 31 when the level determination unit 28 determines that the signal output from the signal amplifier 29 exceeds the threshold value. Yes.

  The gate unit 31 is connected to the transmitter 25, the level determination unit 28, and the counter unit 32, and after the level determination unit 28 outputs a signal, the signal obtained by converting the output of the transmitter 25 into a pulse train, and Only the reference time is output.

  The counter unit 32 is connected to the temperature conversion unit 23 and has a function of counting pulsed signals exceeding the threshold value within a reference time. The counter unit 32 can obtain a vibration frequency at the time of resonance of the vibrator 12, and outputs the vibration frequency toward the temperature conversion unit 23.

  The temperature conversion unit 23 is connected to the determination unit 24, and as described above, based on the vibration frequency input from the counter unit 32 of the frequency detection unit 22, the temperature conversion unit 23 obtains a temperature corresponding to this frequency and sends it to the determination unit 24. It is designed to output toward.

  For example, a crystal having a vibration frequency of 10.010 MHz when the temperature of the inner ring 2 is 10 degrees and a vibration frequency of 10.100 MHz when the temperature of the inner ring 2 is 100 degrees is used as the vibrator 12. When the reference time stored in 30 is 1 msec (1/1000 sec), the counter unit 32 receives a signal of 10010 pulses when the temperature is 10 degrees and a signal of 10100 pulses when the temperature is 100 degrees Will be.

  Then, the counter unit 32 outputs the number of pulses toward the temperature conversion unit 23. When the value 10010 is inputted, the temperature conversion unit 23 obtains the temperature of the inner ring 2 as 10 degrees, and when the value 10100 is inputted, obtains the temperature of the inner ring 2 as 100 degrees.

  The determination unit 24 is connected to a stationary body temperature detector 33 that is attached to the outer ring 3 and detects the temperature of the outer ring 3, so that the temperature of the outer ring 3 is input. It has become. The determination unit 24 includes a first determination unit 34 and a second determination unit 35.

  The first determination unit 34 has a function of determining whether the higher one of the temperature of the inner ring 2 and the temperature of the outer ring 3 has exceeded a first predetermined temperature ΔT1 (shown in FIG. 15). Yes. The second determination unit 35 has a function of determining whether or not the difference between the temperature of the inner ring 2 and the temperature of the outer ring 3 exceeds a second predetermined temperature ΔT2 (shown in FIG. 16).

  The determination unit 24 is less in the case where the first determination unit 34 determines that the first predetermined temperature ΔT1 has been exceeded or the second determination unit 35 has determined that the second predetermined temperature ΔT2 has been exceeded. Both of them have a function of determining that the recommended operation range of the bearing device 1 has been deviated when either one is determined. The recommended operation range indicates a temperature range allowed for the inner ring 2, the outer ring 3, the rolling element 4 and the like when the bearing device 1 is operated economically or technically.

  As described above, after the determination unit 24 determines that the recommended operation range has been exceeded, it is desirable to take measures such as issuing an alarm to the outside or stopping the operation of the bearing device 1. The first and second predetermined temperatures ΔT1 and ΔT2 described above are desirably values according to the material and structure of the inner ring 2, the outer ring 3, the rolling element 4, and the like.

  According to this embodiment, the temperature of the inner ring 2 that is a rotating body is detected using the vibration of the vibrator 12 made of crystal, and the signal emitted from the vibrator 12 is processed via the coils 13 and 16 through the processing device 7. Therefore, there is no restriction on the structure such as the end of the rotating shaft 8, and there is no need to process the rotating shaft 8 to extract a temperature signal.

  Since power is supplied to the vibrator 12 via the coils 13 and 16, it is not necessary to attach a power source such as a battery to the inner ring 2 as a rotating body, and it is not necessary to use an expensive power supply device. The temperature of the inner ring 2 can be detected, and the cost of the bearing device 1 can be reduced.

  Further, since the coils 13 and 16 are provided so as to face each other, a signal from the vibrator 12 can be taken out constantly and reliably, and the temperature of the inner ring 2 can be detected.

  Further, when the first determination unit 34 determines that the higher one of the temperature of the inner ring 2 and the temperature of the outer ring 3 exceeds the first predetermined temperature ΔT1, the determination unit 24 operates the bearing device 1 to operate. Since it is determined that the recommended range has been deviated, even if the temperature of the inner ring 2 that is the rotating body and the outer ring 3 that is the fixed body rise in the same manner, it is determined whether or not the recommended range of operation has been reliably deviated. be able to.

  When the second determination unit 35 determines that the difference between the temperature of the inner ring 2 and the temperature of the outer ring 3 exceeds the second predetermined temperature ΔT2, the determination unit 24 causes the bearing device 1 to deviate from the recommended operation range. Therefore, for example, even when the heat capacity of the outer ring 3 is large, the temperature of the inner ring 2 can be reliably detected, and it can be reliably determined whether or not the recommended operation range has been deviated.

  3 to 5 show the second embodiment, and the same components as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  The bearing device 41 of the present embodiment as an example of a rotating body device is provided with a disc-shaped inner ring spacer member 42 in contact with the inner ring 2 and concentric with the inner ring 2 along the axis P direction with respect to the inner ring 2. The temperature detector 5 is provided on the inner ring spacer member 42. The temperature detector 5 is provided so that the vibrator 12 is in contact with the inner ring 2, and the detection side coil 13 is exposed on the outer peripheral surface side of the inner ring spacer member 42 as shown in FIG. 3 and FIG. The child 12 and the detection side coil 13 are connected by a cable 14.

  3 and 4, the bearing device 41 is in contact with the outer ring 3 and has the same diameter as the outer ring 3 along the axis P direction and in the same direction as the side where the inner ring spacer member 42 is provided. An outer ring spacer member 43 formed in an annular shape is provided, and the receiving portion 6 is provided in the outer ring spacer member 43.

  As shown in FIG. 3, the detection-side coil protector 15 for attaching the temperature detector 5 to the inner ring spacer member 42 may be formed to protrude in the outer peripheral direction from the outer peripheral surfaces of the inner ring 2 and the inner ring spacer member 42. Further, as shown in FIG. 4, the receiving-side coil protection part 18 for attaching the receiving part 6 to the outer ring spacer member 43 may be formed so as to protrude in the inner peripheral direction from the inner peripheral surfaces of the outer ring 3 and the outer ring spacer member 43. .

  Further, as shown in FIG. 5, the receiving portion 6 is not provided on the outer ring 3 and the outer ring spacer member 43, but is a separate member from the inner ring 2 such as the housing 44 of the bearing device 41, the outer ring 3 and the rolling element 4. It may be attached to.

  As shown in FIG. 5, when the receiving unit 6 is attached to the housing 44 or the like, the temperature detecting unit 5 and the temperature detecting unit 5 are arranged so that the coils 13 and 16 face each other along the axis P direction as shown in the figure. The receiving unit 6 may be provided, and the temperature detecting unit 5 and the receiving unit 6 may be provided so that the coils 13 and 16 are opposed to each other along an intersecting direction such as orthogonal to the axis P.

  According to this embodiment, as in the first embodiment described above, there is no restriction on the structure such as the end of the rotating shaft 8, and there is no need to process the rotating shaft 8 to extract a temperature signal. .

  Further, it is not necessary to attach a battery or the like to the inner ring 2, and it is not necessary to use an expensive power supply device. For this reason, the temperature of the inner ring 2 can always be detected, and the cost of the bearing device 41 can be reduced.

  Further, even when the temperature of the inner ring 2 and the outer ring 3 similarly increases, it can be determined whether or not the recommended operation range has been deviated, and for example, even when the heat capacity of the outer ring 3 is large Thus, the temperature of the inner ring 2 can be detected, and it can be reliably determined whether or not the recommended operation range has been deviated.

  As shown in FIGS. 3 and 4, the temperature detector 5 is formed so as to protrude from the outer peripheral surface of the inner ring 2, or the receiver 6 is formed so as to protrude from the inner peripheral surface of the outer ring 3. , 16 is shortened, the coils 13 and 16 can be downsized, and the bearing device 41 can be downsized.

  6 and 7 show a third embodiment. The same components as those in the first and second embodiments are denoted by the same reference numerals, and description thereof is omitted.

  A bearing device 51 according to this embodiment as an example of a rotating body device includes the inner ring spacer member 42 and the outer ring spacer member 43.

  The outer ring spacer member 43 is formed so that the outer diameter thereof is equal to the outer diameter of the outer ring 3, and the inner peripheral surface side thereof protrudes from the inner peripheral surface of the outer ring 3 to the inner peripheral side. The receiving portion 6 is provided on the outer ring spacer member 43 so that the receiving side coil 16 faces the retainer 9.

  Further, as shown in FIG. 6, the temperature detection unit 5 is embedded in the rolling element 4 so that the detection side coil 13 faces the reception side coil 16. At this time, the retainer 9 is preferably formed of a non-magnetic and insulating plastic resin or ceramic.

  When the cage 9 has at least one of magnetic and conductive, it is desirable to cut out a part of the cage 9 existing between the coils 13 and 16, and as shown in FIG. The temperature detector 5 may be attached to the cage 9 so that the coils 13 and 16 face each other.

  As shown in FIG. 7, when the temperature detector 5 is attached to the cage 9, it is desirable that the vibrator 12 is in close contact with the cage 9. When the temperature detector 5 is attached to the cage 9, the temperature detector 5 and the receiver 6 may be provided so that the coils 13 and 16 face each other along the axis P direction as shown in the figure. The temperature detection unit 5 and the reception unit 6 may be provided so that the coils 13 and 16 are opposed to each other along an intersecting direction such as orthogonal to the axis P.

  According to this embodiment, as in the first embodiment and the second embodiment described above, there is no restriction on the structure such as the end of the rotating shaft 8 and the temperature signal is taken out to the rotating shaft 8 or the like. No processing is required.

  Further, it is not necessary to attach a battery or the like to the inner ring 2, and it is not necessary to use an expensive power supply device. For this reason, the temperature of the inner ring 2 can always be detected, and the cost of the bearing device 51 can be reduced.

  Further, even when the temperature of the inner ring 2 and the outer ring 3 rises similarly, it can be determined whether or not the recommended operation range has been deviated, and for example, even when the heat capacity of the outer ring 3 is large The temperature of the inner ring 2 can be detected, and it can be reliably determined whether or not the recommended operation range has been deviated.

  Further, in the first to third embodiments described above, a plurality of receiving units 6 may be provided along the circumferential direction of the outer ring 3 as shown in FIG. 8, and reception by the receiving unit 6 is performed as shown in FIG. The side coil 16 may be provided over the entire circumference of the outer ring 3 or the outer ring spacer member 43.

  When a plurality or all of the circumferences are provided in the circumferential direction as described above, the time during which the detection side coil 13 and the reception side coil 16 are opposed to each other becomes longer while the inner ring 2 makes one rotation, so that the vibration frequency of the vibrator 12 is received. Therefore, the temperature of the inner ring 2 can be measured in a shorter time.

  8 and 9 show the case where the coils 13 and 16 are opposed to each other along the intersecting direction such as orthogonal to the axis P. However, as shown in FIGS. 13 and 16 also face each other along the axis P direction, a plurality of the receivers 16 are provided along the circumferential direction of the outer ring 3, or the receiving side coil 16 is provided over the entire circumference of the outer ring 3 or the outer ring spacer member 43. May be provided.

  In the second to third embodiments described above, the inner ring spacer member 42 and the outer ring spacer member 43 are formed of non-magnetic and insulating plastic resin, ceramic or the like, and are protected in the spacer members 42 and 43. The coils 13 and 16 may be embedded without using the parts 15 and 18.

  In the first to third embodiments, the detection portion mounting cutout portion 10 provided in the inner ring 2 and the inner ring spacer member 42 is shown in FIG. 10 collectively as modifications 10a to 10d of the cutout portion 10. It is desirable that the opening is gradually narrowed toward the outer circumferential direction of 2 so that the detection-side coil protection portion 15 does not come out due to the centrifugal force of the inner ring 2.

  Further, the receiving portion mounting notch portion 11 provided in the outer ring 3 and the outer ring spacer member 43 is formed so that the opening gradually narrows toward the inner peripheral direction of the outer ring 3, and the receiving side coil protection portion 18 does not fall off. It is desirable to do so.

  These notches 10 and 11 may or may not penetrate through the inner ring 2, the outer ring 3, and the spacer members 42 and 43 along the axis P direction.

  When bolts are used when fixing the protective portions 15 and 18 to the notches 10 and 11, it is desirable to use bolts made of non-magnetic material, and when using bolts made of magnetic material, It is desirable to fix at a position away from the coils 13 and 16.

  11 to 14 show a fourth embodiment, and the same components as those in the first to third embodiments are denoted by the same reference numerals and description thereof is omitted.

  A bearing device 61 of the present embodiment as an example of a rotating body device includes a casing 62 in which a rotating shaft 8, an inner ring 2, an outer ring 3, a rolling element 4, and the like are formed in a circular tube shape and in close contact with the outer peripheral surface of the outer ring 3; It is surrounded by the outer ring fixing lid 63. The outer ring fixing lid 63 is formed in a bottomed cylindrical shape integrally having a cylindrical portion that fits into an end portion of the casing 62 along the axis P direction.

  The casing 62 and the outer ring fixing lid 63 are fixed to each other by a bolt 64 screwed along the axis P direction. The inner ring 2 has an inner diameter slightly smaller than the outer diameter of the rotary shaft 8. The inner ring 2 and the rotary shaft 8 are fixed to each other by press-fitting the rotary shaft 8 into the inner ring 2.

  Further, in the bearing device 61 of the present embodiment, the vibrator 12 is brought into close contact with the inner ring 2 and is firmly fixed, and the detection side coil 13 is firmly fixed to the rotating shaft 8. The vibrator 12 and the detection side coil 13 are connected to each other by a cable 14.

  The reception side coil 16 is provided so as to pass through the casing 62 or the outer ring fixing lid 63 and to face the detection side coil 13 at least once as the rotation shaft 8 makes one rotation.

  In FIG. 11, the receiving side coil 16 is provided so as to penetrate the outer ring fixing lid 63, and the coils 13 and 16 are provided so as to face each other along the axis P direction.

  In FIG. 12, a thread groove 65 is provided on the outer periphery of the end portion of the rotary shaft 8. After the rotary shaft 8 is press-fitted and fixed to the inner ring 2, a separate bolt 66 is screwed into the screw groove 65 to fix the inner ring 2 and the rotary shaft 8 more firmly to each other.

  Further, the detection side coil 13 is provided on the outer peripheral surface of the rotary shaft 8. The receiving coil 16 is provided through the casing 62 and the outer ring spacer member 43. The coils 13 and 16 are provided so as to face each other along the direction in which the axis P intersects.

  In FIG. 13, the detection side coil 13 is firmly fixed to an annular ring member 67 having an inner diameter slightly smaller than the outer diameter of the rotary shaft 8. After the rotary shaft 8 is press-fitted and fixed to the inner ring 2, a ring member 67 is press-fitted and fixed to the end of the rotary shaft 8. Thus, the detection side coil 13 is fixed to the rotating shaft 8 via the ring member 67. The receiving side coil 16 is provided so as to penetrate the outer ring fixing lid 63, and the coils 13 and 16 are opposed to each other along the axis P direction.

  In FIG. 14, a thread groove 65 is provided on the outer periphery of the end of the rotating shaft 8, and the inner ring 2 and the rotating shaft 8 are fixed to each other, and then the inner ring spacer member 42 is attached so as to contact the inner ring 2. Then, a separate bolt 66 is screwed into the thread groove 65 to fix the inner ring 2 and the rotary shaft 8 more firmly to each other. Further, the inner ring spacer member 42 is provided with a notch 68 so as not to contact the vibrator 12.

  Further, the detection side coil 13 is provided at the center of the end face of the rotating shaft 8. The receiving coil 16 is provided through the outer ring fixing lid 63. The coils 13 and 16 are opposed to each other along the direction of the axis P.

  According to this embodiment, as in the first to third embodiments described above, there is no restriction on the structure such as the end of the rotating shaft 8, and processing is performed to extract the temperature signal from the rotating shaft 8 or the like. There is no need.

  Further, it is not necessary to attach a battery or the like to the inner ring 2, and it is not necessary to use an expensive power supply device. For this reason, the temperature of the inner ring 2 can always be detected, and the cost of the bearing device 61 can be reduced.

  Even when the temperature of the inner ring 2 and the outer ring 3 rises in the same manner, it can be determined whether or not the recommended operation range has been deviated. For example, even when the heat capacity of the outer ring 3 is large, the inner ring 2 can be reliably detected. Therefore, it can be determined whether or not the recommended operation range has been deviated.

  Further, the vibrator 12 is fixed to the inner ring 2 and the detection side coil 13 is fixed to the rotating shaft 8. For this reason, the cable 14 is disconnected when a so-called creep occurs in which the inner ring 2 and the rotary shaft 8 slide with each other during the operation of the bearing device 61. When the cable 14 is disconnected, the signal from the vibrator 12 is not input to the processing device 7, so that it is possible to reliably grasp whether or not this creep has occurred.

  As shown in FIG. 14, when the detection side coil 13 is provided at the center of the end surface of the rotary shaft 8, the detection side coil 13 is separated from the rotary shaft 8 by the centrifugal force caused by the rotation of the rotary shaft 8 or the like. There is no peeling. For this reason, the temperature of the inner ring 2 can be reliably detected, it can be determined whether or not the bearing device 61 is within the recommended operation range, and whether or not creep has occurred between the inner ring 2 and the rotary shaft 8 is ensured. Can grasp.

  The present invention is not limited to the rolling bearing shown in the first to fourth embodiments, but a rotating body device such as a rolling bearing in which the outer ring 3 is a rotating body and the inner ring 2 is used as a fixed body. It can also be applied to.

  According to the present invention, even when the heat capacity of the rotating body is large and when the temperature of the rotating body and the stationary body rises in the same way, it is determined whether or not the rotating body device has deviated from the recommended operating range. The following method for checking the temperature of the rotating body device that can be performed is obtained.

In a temperature check method for a rotating body device including a fixed body, a rotating body, and a rolling body provided between the fixed body and the rotating body so as to be freely rollable,
A first step of detecting respective temperatures of the fixed body and the rotating body;
When the higher one of the temperature of the stationary body and the temperature of the rotating body exceeds the first predetermined temperature, or the difference between the temperature of the rotating body and the temperature of the stationary body exceeds the second predetermined temperature A second step of determining that the rotating body device has deviated from the recommended operation range in at least one of the cases,
A method for checking the temperature of a rotating body device, comprising:

  According to this temperature check method for a rotating body, the temperature of each of the fixed body and the rotating body is detected, and the higher one of the temperature of the fixed body and the temperature of the rotating body exceeds the first predetermined temperature. Alternatively, when the temperature difference between the stationary body and the rotating body exceeds the second predetermined temperature, it is determined that the rotating body device has deviated from the recommended operation range in at least one of the cases. For this reason, even when the heat capacity of the fixed body or the like is large, even when the temperature of the rotating body and the fixed body rises in the same way, it can be reliably determined whether or not the rotating body device has deviated from the recommended operation range.

The block diagram which shows the structure of the bearing apparatus of the 1st Embodiment of this invention. Sectional drawing which expands and shows a part of bearing apparatus of the embodiment. Sectional drawing which expands and shows a part of bearing apparatus of 2nd Embodiment of this invention. Sectional drawing which expands and shows a part of bearing apparatus of 2nd Embodiment of this invention. Sectional drawing which expands and shows a part of bearing apparatus of 2nd Embodiment of this invention. Sectional drawing which expands and shows a part of bearing apparatus of 3rd Embodiment of this invention. Sectional drawing which expands and shows a part of bearing apparatus of 3rd Embodiment of this invention. The front view of the bearing apparatus which shows the modification of the receiving side coil of the 1st-3rd embodiment of this invention in a partial cross section. The front view of the bearing apparatus which shows the modification of the receiving side coil of the 1st-3rd embodiment of this invention in a partial cross section. The front view of the bearing apparatus which shows the detection part attachment notch part of the 1st-3rd embodiment of this invention. Sectional drawing which expands and shows a part of bearing apparatus of 4th Embodiment of this invention. Sectional drawing which expands and shows a part of bearing apparatus of 4th Embodiment of this invention. Sectional drawing which expands and shows a part of bearing apparatus of 4th Embodiment of this invention. Sectional drawing which expands and shows a part of bearing apparatus of 4th Embodiment of this invention. The figure which shows an example of the temperature rise of a bearing apparatus. The figure which shows an example of the temperature rise of a bearing apparatus.

Explanation of symbols

1 ... Bearing device (rotating body device)
2 ... Inner ring (rotating body)
3. Outer ring (fixed body)
4 ... rolling element 5 ... temperature detector (first temperature detector)
6. Receiving part (receiving means)
7. Processing device (determination means)
12 ... vibrator 13 ... detection coil (transmitter)
16 ... Receiver coil (receiver)
33 ... Fixed body temperature detector (second temperature detecting means)

Claims (6)

In a rotating body device including a fixed body, a rotating body, and a rolling body provided between the fixed body and the rotating body so as to freely roll,
A first temperature detecting means comprising a transmitter for detecting a temperature of one of the rotating body and the rolling element and generating a signal corresponding to the temperature;
Receiving means comprising a receiver for receiving a signal emitted from the transmitter of the first temperature detecting means;
A rotator apparatus comprising: a determination unit that determines whether the temperature of the rotator or the rolling element is within a recommended operation range of the rotator apparatus based on a signal received by the receiving unit.   2. The rotating body device according to claim 1, wherein the first temperature detection unit includes a vibrator, and obtains a temperature corresponding to the frequency based on a vibration frequency of the vibrator.   The rotating body device according to claim 2, further comprising a coil for supplying electric power to the first temperature detection unit.   The rotator apparatus according to claim 3, wherein the transmitter and the receiver are arranged to face each other at least once during one rotation of the rotator.   5. The rotating body device according to claim 2, wherein the vibrator is a crystal vibrator. 6. In a temperature check method for a rotating body device including a fixed body, a rotating body, and a rolling body provided between the fixed body and the rotating body so as to be freely rollable,
A first step of detecting respective temperatures of the fixed body and the rotating body;
When the higher one of the temperature of the stationary body and the temperature of the rotating body exceeds the first predetermined temperature, or the difference between the temperature of the rotating body and the temperature of the stationary body exceeds the second predetermined temperature A second step of determining that the rotating body device has deviated from the recommended operation range in at least one of the cases,
A method for checking the temperature of a rotating body device, comprising:

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