JP2012037013A - Bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing device that can rapidly measure a temperature of a bearing race ring, enhance temperature measurement accuracy of the bearing race ring and improve the accuracy of abnormality prediction and responsiveness of a bearing.SOLUTION: The bearing device is configured to receive preload by placing a spacer between race rings of a plurality of anti-friction bearings 3, 3 arranged in an axial direction. The spacer includes an outer ring spacer 5 laid between outer rings 3g, 3g arranged side by side in the axial direction, and an inner ring spacer 4 laid between inner rings 3i, 3i. The inner ring 3i includes an inner ring side surface abutting on the inner ring spacer 4 and a chamfered detected surface 10 at a corner part of an inner ring outer peripheral surface. The outer ring spacer 5 includes a non-contact temperature sensor 7 for measuring the temperature of the detected surface 10 in a non-contact manner.

Description

  The present invention relates to a bearing device used for a spindle of a machine tool.

  In a spindle device of a machine tool, there is a need to detect a sign of the bearing before the abnormality occurs to prevent the bearing from being abnormal. In order to detect this bearing abnormality, there is an example in which the temperature of the bearing ring of the rotating bearing is detected by a non-contact temperature sensor (Patent Document 1).

JP 2009-68533 A

  In the example in which the temperature of the bearing ring is detected, the temperature of the spacer in contact with the bearing ring is measured in order to measure the temperature of the rotating ring of the bearing with a non-contact thermometer. Generally, the spacer is made of a steel material having the same thermal expansion coefficient as that of the bearing race and is press-fitted into a main shaft or the like. Therefore, when the temperature of the spacer is measured to estimate the temperature of the bearing race, it takes time for heat to be transmitted from the bearing race and there is a problem that a time difference occurs in temperature measurement. Further, there is a problem that a temperature difference is generated between the spacer and the bearing raceway, and the temperature measurement accuracy of the bearing raceway is deteriorated.

  An object of the present invention is to provide a bearing device that can quickly measure the temperature of a bearing race, can improve the temperature measurement accuracy of the bearing race, and can improve the accuracy and responsiveness of a bearing abnormality prediction. It is.

  A bearing device according to the present invention is configured to receive a preload by interposing a spacer between race rings of a plurality of rolling bearings arranged in the axial direction, and the spacer is between outer rings interposed between outer rings arranged in the axial direction. In the bearing device having a seat and an inner ring spacer interposed between the inner rings, the rotation side raceway that contacts the rotation side spacer of the outer ring spacer and the inner ring spacer with respect to the rotation side raceway of the inner and outer rings. A chamfered surface to be detected is provided at a corner between the side surface of the ring and the circumferential surface on the raceway surface side of the rotating side raceway, and the fixed side spacer of the outer ring spacer and the inner ring spacer is A non-contact temperature sensor for measuring the temperature of a chamfered surface to be detected in a non-contact manner is provided.

According to this configuration, the temperature of the detection surface of the rotating raceway is measured in a noncontact manner by the noncontact temperature sensor provided in the fixed spacer. The non-contact temperature sensor does not measure the temperature of the spacer as in the prior art, but directly measures the detected surface that is a part of the rotating side race. This makes it possible to keep the distance between the measurement surface of the non-contact temperature sensor and the surface of the detected surface constant during rotation of the bearing. Therefore, the area measurable by the non-contact temperature sensor can be kept constant with respect to the surface of the surface to be detected during rotation of the bearing.
In this way, since the surface to be detected of the rotating raceway is directly measured by the non-contact temperature sensor, the temperature of the rotating raceway can be measured quickly, and the conventional spacer between the bearing raceway and the bearing raceway can be measured. The temperature difference and temperature measurement time difference are eliminated. Further, since a chamfered surface to be detected is provided on the rotation side raceway and this surface is detected by the non-contact temperature sensor, the area of the surface facing the non-contact temperature sensor is increased, and the temperature detection accuracy is increased. That is, when the temperature of the bearing ring adjacent to the spacer is to be measured by a non-contact temperature sensor outside the bearing, the temperature is measured with the non-contact temperature sensor facing the peripheral surface of the bearing ring on the bearing space side. However, the non-contact temperature sensor faces diagonally with respect to the peripheral surface. Therefore, accurate temperature detection is difficult, but providing a tilted surface to be detected, which is a chamfered surface to be detected, with respect to a non-contact temperature sensor that is arranged obliquely with respect to the bearing axis, The detected surface can be made to face directly. Therefore, the temperature detection accuracy is increased. According to the present invention, the temperature of the bearing race can be quickly measured, the temperature measurement accuracy of the bearing race can be increased, and the accuracy and responsiveness of the bearing abnormality prediction can be improved.

The non-contact temperature sensor may be attached to a fixed spacer so as to face the chamfered detection surface. By attaching the non-contact temperature sensor so as to face the chamfered detection surface in this way, the area of the detection surface that faces the non-contact temperature sensor can be increased. Thereby, the temperature measurement precision of a rotation side track ring can be raised easily.
The non-contact temperature sensor may be a sensor that detects infrared radiation from the object to be measured. In this case, the non-contact temperature sensor detects infrared rays emitted from the chamfered surface to be detected of the rotating side race. Thereby, the temperature of the rotation side raceway can be measured. As this non-contact temperature sensor, a pyroelectric infrared sensor, a thermopile, or the like is applicable.

  The fixed side spacer is provided with another temperature sensor for measuring the temperature of the fixed side spacer or the temperature of the fixed side raceway of the inner and outer rings, and the temperature measured by the other temperature sensor and the non-contact Preload estimation means for estimating the preload of the bearing from the temperature measured by the temperature sensor and the rotation speed of the rotating raceway may be provided. When the bearing temperature rises due to the operation of the bearing, the preload becomes larger than the initial set value due to the expansion of the rotating side race ring and the like. The preload can be estimated by setting this relationship by an arithmetic expression or a table. In this case, the preload estimating means can estimate the preload applied to the bearing more accurately by comparing the temperature of both the fixed-side raceway ring and the rotation-side raceway ring and the rotational speed with the arithmetic expression or the table. . The estimated bearing preload value can be used for controlling the bearing preload, monitoring the machining state of the machine tool, and the like.

In the present invention, a slit may be formed at least in one circumferential direction at the axial end of the fixed side spacer, and the other temperature sensor and the non-contact temperature sensor may be provided in the slit. In this case, other temperature sensors and non-contact temperature sensors can be disposed close to the bearings. Therefore, the temperature of the bearing ring can be measured more accurately, and thereby the preload applied to the bearing can be accurately estimated.
In these inventions, an abnormality detecting means for detecting an abnormality of the bearing from both temperatures measured by the other temperature sensor and the non-contact temperature sensor may be provided. Even when the temperature of one of the inner and outer rings is higher than the temperature of the other bearing ring, the abnormality detection means detects the abnormality of the bearing from the two temperatures, so the abnormality of the bearing is detected. It can be detected quickly.
Because the bearing abnormality is detected by measuring the temperature of the stationary raceway and the rotating raceway, it is possible to accurately predict the bearing abnormality at an appropriate timing compared to when measuring the temperature of only the stationary raceway. be able to. Further, by directly measuring the temperature of the bearing ring without measuring the spacer temperature, the time difference and temperature difference of the temperature measurement can be reduced, so that the accuracy and responsiveness of abnormality prediction can be further improved. .

  A bearing device according to the present invention is configured to receive a preload by interposing a spacer between race rings of a plurality of rolling bearings arranged in the axial direction, and the spacer is between outer rings interposed between outer rings arranged in the axial direction. In the bearing device having a seat and an inner ring spacer interposed between the inner rings, the rotation side raceway that contacts the rotation side spacer of the outer ring spacer and the inner ring spacer with respect to the rotation side raceway of the inner and outer rings. A chamfered surface to be detected is provided at a corner between the side surface of the ring and the circumferential surface on the raceway surface side of the rotating side raceway, and the fixed side spacer of the outer ring spacer and the inner ring spacer is Since a non-contact temperature sensor that measures the temperature of the surface to be detected in a non-contact manner is provided, the temperature of the bearing race can be measured quickly, and the temperature measurement accuracy of the bearing race is increased, and the accuracy of bearing abnormality prediction is improved. Responsiveness can be improved.

It is sectional drawing of the bearing apparatus which concerns on 1st Embodiment of this invention. It is sectional drawing of the principal part of the bearing apparatus. FIG. 3 is an end view taken along line III-III in FIG. 2. It is sectional drawing of the principal part of the bearing apparatus which concerns on other embodiment of this invention. It is sectional drawing of the principal part of the bearing apparatus which concerns on other embodiment of this invention.

  A first embodiment of the present invention will be described with reference to FIGS. In the bearing device according to the first embodiment, a shaft 2 is rotatably supported on a housing 1 by a plurality of bearings 3. This bearing device is applied to, for example, a spindle device of a machine tool. In this case, the shaft 2 becomes the main shaft 2 of the spindle device.

  As shown in FIG. 1, a plurality of axially spaced bearings 3 are fitted into the main shaft 2 in an interference fit state, and a ring-shaped inner ring spacer 4 is interposed between the inner rings 3i and 3i, and between the outer rings 3g and 3g. Is provided with a ring-shaped outer ring spacer 5. In this example, the inner ring spacer 4 is a rotating side spacer, and the outer ring spacer 5 is a fixed side spacer. The inner ring 3i is a rotation side race and the outer ring 3g is a fixed side race. The bearing 3 is a rolling bearing in which a plurality of rolling elements T are interposed between the raceway surface 3ia of the inner ring 3i and the raceway surface 3ga of the outer ring 3g. The plurality of rolling elements T are held at regular intervals in the circumferential direction by a cage Rt. The bearing 3 is a bearing capable of applying an axial preload, and an angular ball bearing, a deep groove ball bearing, a tapered roller bearing, or the like is used. In the illustrated example, an angular ball bearing is used, and the two bearings 3 and 3 are installed in a back surface combination.

  The outer ring spacer 5 is provided with a temperature sensor 6 and a non-contact temperature sensor 7 which will be described later. The temperature sensor 6 is a sensor that detects the temperature of the outer ring spacer 5. The heat of the outer ring 3g is transmitted to the outer ring spacer 5 by heat conduction, and the outer ring temperature is obtained by the temperature sensor 6. The non-contact temperature sensor 7 is a sensor that detects the surface temperature of the inner ring 3i in a non-contact manner. The spindle device is provided with a rotation sensor S1 for detecting the rotation speed of the spindle 2.

The housing 1 includes a housing body 13 and a lid member Fb. The housing body 13 is formed with a cylindrical hole 1b in which the two bearings 3 and 3 and the outer ring spacer 5 are installed. The front surface of the outer ring of the bearing 3 on the left side of FIG. 1 is in contact with the bottom surface 1 c of the housing 1, and the back surface of the inner ring of the bearing 3 is in contact with the large-diameter step portion 2 a formed on the front end side of the main shaft 2. Incorporated.
Both end portions in the axial direction of the outer ring spacer 5 are not in contact with the bearing surface 5a that contacts the rear surface of the outer ring on the outer diameter side, and the bearing 3 that continues to the inner diameter side of the contact surface 5a via a stepped portion. A contact surface 5b.

  With the two bearings 3, 3, the inner and outer ring spacers 4, 5, and the main shaft 2 installed in the housing body 13, a lid member Fb that closes the cylindrical hole 1 b is bolted to the housing body 13 (not shown). Is fixed with an appropriate tightening torque. The lid member Fb has an annular protrusion Fba that protrudes toward the right bearing 3 in the cylindrical hole 1b in a state of being fixed to the housing body 13 and abuts against the front surface of the outer ring of the bearing 3.

  On the proximal end side of the main shaft 2, that is, on the right side in FIG. 1, a small-diameter shaft portion smaller in diameter than the fitting surface for fitting the bearing 3 is provided, and a male screw 2 b is formed on the outer peripheral surface of the small-diameter shaft portion. A nut 9 is configured to be screwed into the male screw 2b. In the state where the two bearings 3, 3, the inner and outer ring spacers 4, 5 and the main shaft 2 are installed in the housing 1, the axial dimension, that is, the width dimension of the outer ring spacer 5 is the same as the width dimension of the inner ring spacer 4. The nut 9 that is in contact with the back surface of the inner ring of the bearing 3 on the right side of FIG. 1 via the tubular member 8 is tightened to preload the bearing according to the width dimension difference between the outer ring spacer 5 and the inner ring spacer 4. Is granted.

Slits SL and SL are formed at one circumferential position at both axial ends of the outer ring spacer 5, and a temperature sensor 6 and a non-contact temperature sensor 7 are installed in each of the slits SL and SL. Here, the temperature sensor 6 and the non-contact temperature sensor 7 at the right end portion in the axial direction and the temperature sensor 6 and the non-contact temperature sensor 7 at the left end portion in the axial direction are left and right target structures, and therefore the sensor at the left end portion in the axial direction. Only 6 and 7 will be described.
As shown in FIG. 2, in the outer ring spacer 5, a temperature sensor 6 is fixed to a groove bottom surface SLa that forms a part of the slit SL. The temperature sensor 6 is realized by, for example, a thermocouple, a side temperature resistor, a thermistor, or the like.

  As shown in FIG. 3, the groove bottom surface SLa of the slit SL is formed in a notch in an annular contact surface 5 a on the radially outer side at the axial end portion of the outer ring spacer 5. That is, the groove bottom surface SLa is notched to provide the temperature sensor 6 at one place in the circumferential direction on the annular contact surface 5a. In this example, as shown in FIG. 2, the groove bottom surface SLa is deeper than the non-contact surface 5b of the outer ring spacer 5 and is notched in parallel to the contact surface 5a. The provided temperature sensor 6 is disposed so as not to interfere with the rear surface of the outer ring.

  A non-contact temperature sensor 7 is fixed to a tapered groove bottom surface SLb that forms a part of the slit SL in the outer ring spacer 5. The tapered groove bottom surface SLb is formed in substantially the same phase as the groove bottom surface SLa and narrower than the groove bottom surface SLa. Further, the tapered groove bottom surface SLb is formed in a tapered shape from the abutting surface 5a to the non-abutting surface 5b in the vicinity of the middle in the radial direction at the axial end portion of the outer ring spacer 5. The tapered groove bottom surface SLb is formed with a predetermined taper angle α1 (α1 is 45 degrees, for example) with respect to the axial end of the outer ring spacer 5. This taper angle α1 is such that the tapered groove bottom surface SLb is parallel to the surface of the chamfered detected surface 10 provided at the corner of the inner ring 3i, and the detected surface 10 is It is determined to face each other. A groove bottom surface SLc is formed from the inner diameter side edge of the tapered groove bottom surface SLb toward the inner ring 3i.

  As the non-contact temperature sensor 7 attached to the tapered groove bottom surface SLb, for example, a pyroelectric infrared sensor or a thermopile can be applied. However, the non-contact temperature sensor 7 is not limited to a pyroelectric infrared sensor or a thermopile. In this example, the non-contact temperature sensor 7 is formed in a cylindrical shape, and the base end portion in the longitudinal direction of the non-contact temperature sensor 7 is attached to the tapered groove bottom surface SLb. 7a (measurement surface 7a) faces the detected surface 10 of the inner ring 3i, i.e., faces the surface of the inner ring 3i. Thereby, the non-contact temperature sensor 7 can measure the surface temperature of the detected surface 10 in a non-contact manner.

  As shown in FIG. 2, the detected surface 10 of the inner ring 3i is a corner portion between the side surface 3h of the inner ring 3i that contacts the inner ring spacer 4 and the circumferential surface 3d on the raceway surface side of the inner ring 3i, that is, the inner ring outer circumferential surface 3d. It is provided all around. Since the inner ring 3i is rotating and the surface facing the non-contact temperature sensor 7 is constantly changed, the detected surface 10 needs to be provided on the entire circumference of the corner. When it is formed only in a part in the circumferential direction, the effect of the corner is not so much. The detected surface 10 is formed by chamfering the corner portion of the inner ring 3i. The axial dimension L1 and the radial dimension L2 of the detection surface 10 are defined according to the surface area of the measurement surface 7a of the non-contact temperature sensor 7, the distance between the measurement surface 7a and the detection surface 10, and the like. Further, in order to make the detected surface 10 parallel to the measurement surface 7a of the non-contact temperature sensor 7, the taper angle α1 is related. The other corners of the inner ring 3i are rounded with a radius smaller than the axial dimension of the detected surface 10 in consideration of interference with other members.

  As shown in FIG. 1, the wiring Cd, which is the output part of the temperature sensor 6 and the non-contact temperature sensor 7, is pulled out of the housing 1 through a hole 1 a provided in the housing 1 to detect an abnormality in the rolling bearing. Is electrically connected to the abnormality detecting means Ea. The abnormality detection means Ea includes preload estimation means Ya. This preload estimating means Ya is a preload applied to the bearing 3 from the temperature measured by the temperature sensor 6, the temperature measured by the non-contact temperature sensor 7, and the rotational speed of the spindle 2 measured by the rotation sensor S1. Is estimated. The preload estimating means Ya includes a temperature measured by the temperature sensor 6, a temperature measured by the non-contact temperature sensor 7, a rotation speed measured by the rotation sensor S1 that detects the rotation speed of the spindle 2, and the preload. A relationship setting unit (not shown) in which the relationship is set by an arithmetic expression or a table or the like is provided, and the bearing preload is estimated by comparing the calculated temperatures of the inner and outer rings 3i and 3g and the rotational speed of the main shaft 2 with the relationship setting unit. . The estimated bearing preload value can be used for controlling the bearing preload, monitoring the machining state of the machine tool, and the like. The preload estimation means Ya may be an electronic circuit provided independently, or may be a part of a control device that controls the spindle device.

The operation and effect of the spindle device described above will be described.
When the spindle 2 is rotated by a drive source (not shown) of the spindle device, the temperature of the bearing 3 rises and the inner ring 3i expands, the preload becomes larger than the initial set value. Here, the contact surfaces 5a at both ends in the axial direction of the outer ring spacer 5 are in contact with the back surface of the outer ring, so that the heat of the outer ring 3g is transmitted to the outer ring spacer 5 by heat conduction and is obtained by the temperature sensor 6. . The temperature of the outer ring 3g is obtained by correction based on the material specific heat conductivity of the outer ring spacer 5, the distance from the contact surface 5a of the outer ring spacer 5 to the temperature sensor 6, and the like. In this example, since the temperature sensor 6 is installed in the slit SL at both axial ends of the outer ring spacer 5, the distance from the contact surface 5a of the outer ring spacer 5 to the temperature sensor 6 can be shortened as much as possible. Therefore, the temperature of the outer ring 3g can be measured quickly, and the temperature measurement accuracy of the outer ring 3g can be increased.

The temperature of the inner ring 3i is directly measured in a non-contact manner by a non-contact temperature sensor 7 facing the detected surface 10 of the inner ring 3i. The non-contact temperature sensor 7 does not measure the temperature of the spacer as in the prior art, but directly measures the detected surface 10 that is a part of the inner ring 3i. This makes it possible to keep the distance between the measurement surface 7a of the non-contact temperature sensor 7 and the surface of the detected surface 10 constant during rotation of the bearing. Therefore, the area measurable with the non-contact temperature sensor 7 can be kept constant with respect to the surface of the surface 10 to be detected during rotation of the bearing.
In this way, since the detected surface 10 of the inner ring 3i is directly measured by the non-contact temperature sensor 7, the temperature of the inner ring 3i can be quickly measured, and the temperature difference between the conventional spacer and the bearing raceway ring. The time difference of temperature measurement is eliminated. Since the chamfered surface 10 to be detected is applied to the portion facing the non-contact temperature sensor 7 to increase the area of the surface facing the non-contact temperature sensor 7, the temperature detection accuracy of the inner ring 3i is increased. In this example, a chamfered surface 10 to be detected is provided at the corner between the inner ring outer peripheral surface 3d on the raceway surface side and the inner ring side surface 3h in contact with the inner ring spacer 4 among the inner rings 3i that are rotation side raceways. Since this surface is detected by the non-contact temperature sensor 7, the area of the surface facing the non-contact temperature sensor 7 is increased, thereby increasing the temperature detection accuracy. That is, when the temperature of the inner ring adjacent to the inner ring spacer is to be measured by a non-contact temperature sensor outside the bearing, the measurement is performed with the non-contact temperature sensor facing the peripheral surface of the bearing ring on the bearing space side. The non-contact temperature sensor faces diagonally with respect to the peripheral surface. Therefore, accurate temperature detection is difficult. However, when the inclined detection surface 10 which is a chamfered detection surface 10 is provided, the non-contact temperature sensor 7 is arranged in an oblique orientation with respect to the bearing axis. On the other hand, the detected surface 10 can be made to face directly. Therefore, the temperature detection accuracy is increased.
Accordingly, the temperature of the inner and outer rings 3i and 3g can be measured quickly, the temperature measurement accuracy of the inner and outer rings 3i and 3g can be increased, and the accuracy and responsiveness of the bearing abnormality prediction can be increased.
The non-contact temperature sensor 7 is attached to the outer ring spacer 5 so as to face the detected surface 10. By attaching the non-contact temperature sensor 7 so as to face the detected surface 10 in this way, the area of the detected surface 10 that faces the non-contact temperature sensor 7 can be increased. Thereby, the temperature measurement accuracy of the inner ring 3i which is the rotation side raceway can be easily increased. In the inner ring 3i, the detected surface 10 is formed with an axial dimension L1 and a radial dimension L2 larger than the chamfering of other corners that are performed in consideration of interference with other members. Therefore, the surface area of the detected surface 10 can be set larger than the surface area of the chamfers of other corners. Thereby, the to-be-detected surface 10 can be reliably faced with respect to the non-contact temperature sensor 7 which becomes the arrangement | positioning attitude | position of the diagonal direction with respect to a bearing shaft center. Therefore, the temperature measurement accuracy of the inner ring 3i can be easily increased.

The preload estimating means Ya estimates the preload applied to the bearing from the temperatures of the inner and outer rings 3i, 3g thus obtained and the rotational speed of the main shaft 2.
The abnormality detection means Ea detects an abnormality of the bearing 3 based on the preload of the bearing 3 estimated by the preload estimation means Ya, the outer ring temperature obtained by the temperature sensor 6 and the inner ring temperature measured by the non-contact temperature sensor 7. To detect. The abnormality detection means Ea has a relation setting means (not shown) in which the relationship between the inner and outer ring temperatures and the preload is obtained and set by an arithmetic expression or a table or the like. It is determined whether or not the bearing is abnormal. The abnormality detecting means Ea may measure the peak voltage of the electric signal proportional to the obtained inner / outer ring temperature or the like, and determine that the bearing is abnormal when the peak voltage is outside a predetermined threshold. The abnormality detection means Ea may be an electronic circuit provided independently, or may be a part of a control device that controls the spindle device.

Another embodiment of the present invention will be described with reference to FIGS. Except for the part specifically described, the other parts of the configuration are the same as those described above.
As shown in FIG. 4, the temperature sensor 6 may be installed in the slits SL at both ends in the axial direction of the outer ring spacer 5 so as to contact the back surface of the outer ring. As shown in FIG. 5, the slit SL to which the temperature sensor 6 is fixed may be filled with a molding material Md made of a material having high thermal conductivity. 4 and 5, the heat of the outer ring 3g is easily transmitted to the temperature sensor 6, so that the temperature of the outer ring 3g can be measured quickly and the temperature measurement accuracy of the outer ring 3g can be increased. In the case of FIG. 5, the entire temperature sensor 6 is covered with the molding material Md, so that the sealing performance against the lubricant or the like can be improved.

Although not shown, most of the non-contact temperature sensor 7 except the measurement surface 7a may be covered with a molding material.
The bearing device described above can also be applied to devices other than spindle devices, robots, and the like. In each embodiment, the two bearings are installed in the rear combination, but may be installed in the front combination. Further, the number of bearings is not necessarily limited to two. In apparatuses other than the spindle apparatus, for example, the present invention may be applied to an inner ring fixed and outer ring rotating type bearing apparatus. In this case, it is desirable to draw out the output wiring of the sensor or the like outside the bearing device through the inside of the shaft.

DESCRIPTION OF SYMBOLS 3 ... Bearing 3i ... Inner ring 3d ... Inner ring outer peripheral surface 3g ... Outer ring 3h ... Side surface 4 ... Inner ring spacer 5 ... Outer ring spacer 6 ... Temperature sensor 7 ... Non-contact temperature sensor 10 ... Chamfered detected surface Ea ... Abnormality detection Means Ya ... Preload estimation means S1 ... Rotation sensor SL ... Slit

Claims (7)

It is configured to receive a preload by interposing a spacer between the bearing rings of a plurality of rolling bearings aligned in the axial direction, and the spacer is interposed between the outer ring spacer interposed between the outer rings aligned in the axial direction and the inner ring. In a bearing device having an inner ring spacer
Regarding the rotation side raceway of the inner and outer rings, the side surface of the rotation side raceway that contacts the rotation side spacer of the outer ring spacer and the inner ring spacer, and the raceway side peripheral surface of the rotation side raceway ring, Provide a chamfered surface to be detected at the corner of
A bearing device, wherein a non-contact temperature sensor that measures the temperature of the detected surface in a non-contact manner is provided in a fixed-side spacer of the outer ring spacer and the inner ring spacer.   The bearing device according to claim 1, wherein the non-contact temperature sensor is attached to a fixed spacer so as to face the detected surface.   3. The bearing device according to claim 1, wherein the non-contact temperature sensor is a sensor that detects infrared radiation from a measurement object. In any one of Claims 1 thru / or Claim 3, other temperature sensors which measure the temperature of this fixed side spacer or the temperature of the fixed side track ring of the inner and outer rings are provided in the fixed side spacer,
A bearing device provided with preload estimation means for estimating a bearing preload from a temperature measured by the other temperature sensor and a temperature measured by the non-contact temperature sensor, and a rotation speed of the rotating raceway.   5. The bearing device according to claim 4, wherein a slit is formed at least in one circumferential direction at an axial end of the fixed side spacer, and the other temperature sensor and the non-contact temperature sensor are provided in the slit.   6. The bearing device according to claim 4 or 5, wherein abnormality detecting means is provided for detecting abnormality of the bearing from both temperatures measured by the other temperature sensor and the non-contact temperature sensor.   6. The abnormality detection means according to claim 4 or 5, wherein an abnormality of the bearing is detected based on both temperatures measured by the other temperature sensor and the non-contact temperature sensor and the preload of the bearing estimated by the preload estimation means. Bearing device provided with.

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