JP2010194684A - Bearing for main spindle device of machine tool, main spindle device of machine tool, and machine tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing for a main spindle device of a machine tool excellent in maintainability and handleability, in which highly responsive temperature measurement is possible, and a temperature sensor can be easily separated from the bearing, and to provide the main spindle device of the machine tool, and the machine tool. <P>SOLUTION: The main spindle device 20 of the machine tool supports a rotary shaft 22 freely rotatably with respect to an outer cylinder 29, wherein a tool can be attached to the rotary shaft 22. In the front side bearing 60, the temperature sensor 52 is non-adhesively arranged in a vicinity of a contact point p of an outer ring 61 and a ball 63 so as to be freely detached from the bearing 60. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a spindle device bearing for a machine tool, a spindle device for a machine tool, and a machine tool.

  2. Description of the Related Art In recent years, spindle devices for machine tools are required to have a high speed rotation with a dm · N of 1,000,000 to 3,000,000 and low vibration, and those using a built-in motor system are often used. For example, in the spindle device 100 shown in FIG. 12, a rotating shaft 101 to which a tool T is attached is rotatably attached to the outer cylinder 104 via a front bearing 102 and a rear bearing 103. A built-in motor 108 including a rotor 105 provided around the rotation shaft 101 and a stator 107 provided inside the outer cylinder 104 via a cooling jacket 106 between the front and rear bearings 102 and 103. Is arranged.

  Further, in the spindle device 100, cooling is performed by cooling paths 109 and 110 formed in the outer cylinder 104 and the cooling jacket 106 in order to prevent thermal displacement. Further, in the main spindle device 100, a small amount of feed using lubricating oil having a low kinematic viscosity of 10 to 32 cSt is provided via an oil supply path 111 formed in the outer cylinder 104 in order to lubricate the front bearing 102 and the rear bearing 103. Oil is used to prevent abnormal heat generation in the bearing.

  Further, a thermocouple 112 serving as a temperature sensor is disposed on the outer cylinder 104 radially outward of the front bearing 102, and the temperature of the outer ring outer diameter surface of the bearing 102 and the vicinity thereof are measured to determine the temperature of the bearing 102. I try to prevent seizure.

  On the other hand, as a structure for measuring the temperature of the bearing, a structure in which wiring is arranged in a hole formed in the outer ring and a temperature sensor is arranged on the inner peripheral surface of the outer ring has been devised (for example, see Patent Document 1). .

JP 2008-175383 A

  By the way, the spindle device for machine tools is operated at a high speed and a high load, and if the temperature difference between the inner and outer rings of the bearing becomes large due to the effect of supercooling or motor heat generation, the seizure of the bearing may occur due to an increase in preload. There is. Further, in the spindle device 100 shown in FIG. 12, the response speed of the thermocouple 112 that measures the outer surface of the outer ring is slow, and the temperature of the bearing 102 cannot be measured with high sensitivity. Further improvement is required.

  Further, in Patent Document 1, the temperature sensor is fitted in the bearing or fixed by a heat-resistant adhesive, and is not easily separable, and cannot be replaced separately when the bearing malfunctions or when the sensor malfunctions. . In particular, when the temperature sensor is fixed with an adhesive, the adhesive may be peeled off, so that there is a problem that the bearing cannot be cleaned immediately before the assembly of the spindle.

  The present invention has been made in view of the above-described problems, and its purpose is to enable temperature measurement with high responsiveness and to easily separate the temperature sensor and the bearing, and is excellent in maintainability and handleability. Another object is to provide a bearing for a spindle device of a machine tool, a spindle device of a machine tool, and a machine tool.

The above object of the present invention can be achieved by the following constitution.
(1) an inner ring having an inner ring raceway surface on the outer peripheral surface;
An outer ring having an outer ring raceway surface on the inner circumferential surface;
A plurality of rolling elements disposed between the inner ring raceway surface and the outer ring raceway surface;
A bearing for a spindle device of a machine tool that rotatably supports a rotating shaft with respect to a housing,
A bearing for a spindle device of a machine tool, wherein a temperature sensor is detachably disposed in the vicinity of a contact point between the outer ring and the rolling element.
(2) The temperature sensor is attached to the storage portion of the fixing member,
The temperature sensor is disposed in the vicinity of a contact point between the outer ring and the rolling element by fastening the fixing member to the outer ring with a fastening member. Bearing for main shaft equipment.
(3) The spindle device bearing for a machine tool according to (2), wherein the fixing member is attached to a groove portion formed on an inner peripheral surface of the outer ring together with a temperature sensor.
(4) The temperature sensor is attached to a fixing member,
The temperature sensor is disposed in the vicinity of a contact point between the outer ring and the rolling element by fastening the fixing member to the housing with a fastening member. Bearing for main shaft equipment.
(5) The bearing according to any one of (1) to (4);
The rotating shaft on which the inner ring is fitted;
The housing in which the outer ring is fitted;
A spindle device for a machine tool, comprising:
(6) A machine tool comprising the spindle device according to (5).

  According to the present invention, since the temperature sensor is detachably disposed with the bearing near the contact point between the outer ring and the rolling element, temperature measurement with high responsiveness is possible. It can be easily separated and has excellent maintainability and handling.

It is the schematic of the main axis | shaft apparatus of a machine tool provided with the bearing of this invention. It is a principal part expanded sectional view which shows the front side bearing vicinity of FIG. (A) is sectional drawing which shows the front side bearing of FIG. 1, (b) is sectional drawing which shows the board | plate material for fixing to which the temperature sensor was attached. It is a figure which shows the state which attaches a temperature sensor to the front side bearing of FIG. (A) is a top view which shows the temperature sensor part formed on the film substrate of a temperature sensor, (b) is a top view which shows a film cover on a film substrate, (c) is ( It is sectional drawing of the temperature sensor cut | disconnected along the VV line | wire of b). (A) is a top view which shows the temperature sensor part formed on the film substrate of another temperature sensor, (b) is a top view which shows a film cover on a film substrate, (c) is It is sectional drawing of the temperature sensor cut | disconnected along the VI-VI line of (b). It is a principal part expanded sectional view of the front side bearing vicinity which concerns on the spindle apparatus bearing of the machine tool of 2nd Embodiment. (A) is sectional drawing which shows the front side bearing of FIG. 7, (b) is a side view of the front side bearing seen from the tool side. (A) is a figure which shows the state which attaches a temperature sensor to the front side bearing of FIG. 7, (b) is the side view which looked at the front side bearing before a temperature sensor is attached from the tool side. It is a principal part expanded sectional view of the front side bearing vicinity which concerns on the spindle apparatus bearing of the machine tool of 3rd Embodiment, (b) is the figure which looked at a part of front side housing of (a) from the X direction. (A) is a principal part expanded sectional view of the front side bearing vicinity which concerns on the spindle apparatus bearing of the machine tool of the modification of 3rd Embodiment, (b) is a part of the front lid of (a) XI. It is the figure seen from the direction. It is sectional drawing in the conventional main axis | shaft apparatus.

(First embodiment)
Hereinafter, a bearing for a spindle device of a machine tool, a spindle device of a machine tool, and a machine tool according to a first embodiment of the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, the main shaft device 20 is a built-in motor system, and a hollow rotating shaft 22 is provided in the center in the axial direction, and a draw bar 23 slides on the axis of the rotating shaft 22. It is freely inserted. The draw bar 23 urges the pull stud 25 attached to the tool holder 24 in the counter tool side direction (right direction in the drawing) by the force of the spring member 27 via the clamp ball 26. It fits with the tapered surface 28 of the rotating shaft 22. The tool T is attached to the tool holder 24. As a result, the rotary shaft 22 can clamp the tool T at one end (left side in the drawing) and attach the tool T.

  Further, the rotary shaft 22 is rotatable to the outer cylinder 29 constituting the housing by two rows of front bearings 60 and 70 supporting the tool side and a row of rear bearings 80 supporting the opposite tool side. It is supported. The front bearings 60 and 70 and the rear bearing 80 constitute the spindle device bearing of the present embodiment.

  A rotor 30 is fitted on the outer peripheral surface of the rotary shaft 22 between the front bearings 60 and 70 and the rear bearing 80. The stator 32 disposed around the rotor 30 is fixed to the outer cylinder 29 by fitting a cooling jacket 33 shrink-fitted into the stator 32 into the outer cylinder 29. Therefore, the rotor 30 and the stator 32 constitute a motor, and the motor control unit 31 supplies electric power to the stator 32 to generate a rotational force in the rotor 30 and rotate the rotating shaft 22.

  Further, a tool unclamp cylinder 36 constituting a housing in which a tool unclamp piston 35 is slidably fitted is fixed to a rear lid 34 constituting a housing fixed to the outer cylinder 29 on the side opposite to the tool. . Therefore, when exchanging the tool, hydraulic oil is guided from the oil passage (not shown) to the hydraulic chamber 38, and the tool unclamp piston 35 is advanced to the tool side (left side in the figure), so that the drawbar 23 is moved to the tool side (figure The tool T is unclamped.

  As shown in FIG. 2, the front bearings 60, 70 are substantially made up of outer rings 61, 71, inner rings 62, 72, balls 63, 73 as rolling elements arranged with contact angles, and balls 63, 73. Angular ball bearings having outer ring guide cages 64 and 74 that are held at equal intervals. As shown in FIG. 1, the rear bearing 80 includes an outer ring 81, an inner ring 82, a cylindrical roller 83 as a rolling element, and an outer ring guide cage (not shown) that holds the cylindrical roller 83 at substantially equal intervals. And a cylindrical roller bearing.

  Outer rings 61, 71 of the front bearings 60, 70 are fitted in a front housing 50 fastened and fixed to the outer cylinder 29, and are front-side through an outer ring spacer 40 by a front lid 51 bolted to the front housing 50. It is fixed to the housing 50 in the axial direction. The inner rings 62 and 72 of the front bearings 60 and 70 are fitted on the rotary shaft 22 and are axially connected to the rotary shaft 22 via the inner ring spacer 42 by a nut 41 fastened to the rotary shaft 22. It is fixed. The front housing 50 and the front lid 51 also constitute a housing.

  An outer ring 81 of the rear bearing 80 is fitted in the rear lid 34 and is fixed to the rear lid 34 by a rear bearing outer ring presser 43 that is bolted to the rear lid 34. The inner ring 82 of the rear bearing 80 is taper-fitted to the rotary shaft 22 and is positioned via the inner ring spacer 46 by another nut 45 fastened to the rotary shaft 22.

  Here, cooling grooves 33a and 50a are formed in the cooling jacket 33 and the front housing 50, and each component of the spindle device 20 is cooled by the supplied cooling oil to prevent thermal displacement of these components. Yes. In FIG. 2, the cooling groove 50a of the front housing 50 is omitted.

  Further, as shown in FIG. 1, the outer cylinder 29, the rear lid 34, and the front housing 50 are formed with a plurality of oil supply passages 90 for lubricating the front bearings 60 and 70 and the rear bearing 80, respectively. A lubrication device 91 that feeds lubricating oil is attached to one end side of each passage 90 via a pipe (not shown). A lubrication nozzle (not shown) is attached to the other end side of each oil supply passage 90, and the lubricating oil sent by the lubrication device 91 is supplied into the bearing space of each bearing 60, 70, 80.

  In addition, by arranging the lubricating nozzle so that the lubricating oil is supplied into the bearing space from the counter-bore side, the lubricating oil is not directly discharged to the temperature sensor 52 described later disposed on the counter-bore side. The effect on temperature measurement can be suppressed. The lubrication method supplied by the lubrication device 91 may be oil lubrication, and may be any of oil-air lubrication, oil mist lubrication, direct injection lubrication, and the like.

  As shown in FIG. 3, the outer ring 61 of the front bearing 60 has a sensor receiving groove 61c formed in a part of the inner peripheral surface 61a on the counter bore side, and opens to a flat surface of the receiving groove 61c. Thus, a female screw hole 61d penetrating in the radial direction is formed. In the accommodation groove 61c, a substantially rectangular parallelepiped fixing plate member (fixing member) 92 to which the temperature sensor 52 is attached is accommodated and fixed.

  Specifically, as shown in FIG. 3B, the fixing plate 92 has a groove (housing portion) 92 a having a depth substantially equal to the thickness of the temperature sensor 52. In addition, a female thread portion 92 b that penetrates in the height direction is formed on the side of the groove portion 92. Accordingly, the temperature sensor 52 is bonded and fixed to the groove 92a of the fixing plate 92, and the temperature sensor 52 fixed to the groove 92a is directed toward the flat surface of the storage groove 61c of the outer ring 61 as shown in FIG. The small screw 93, which is a fastening member, is tightened in a state where the female screw portion 92b of the fixing plate 92 and the female screw hole 61d of the outer ring 61 are combined. As a result, the temperature sensor 52 is housed and fixed in the housing groove 61c of the outer ring 61 together with the fixing plate 92 without protruding from the counter bore side surface 61a.

The temperature sensor 52 is connected to the temperature detection unit 54 via the electrical wiring 53. The electrical wiring 53 is routed to the counter bore side of the bearing 60 through the radial hole 50 b formed in the front housing 50.
In addition to the method of directly connecting the temperature sensor 52 and the temperature detection unit 54, the electrical wiring 53 is a male-female joint between the vicinity of the bearing end and the measurement amplifier of the temperature detection unit 54 as necessary. (Separator, etc.) etc. may be used to connect the separation line.

  As shown in FIGS. 5A to 5C, the temperature sensor 52 is composed of a heat-resistant and flexible polymer material (polyimide (PI), polyamide (PA), polyether ether ketone (PEEK), etc.). Resin), a film-like temperature sensor portion 56 made of platinum or the like formed on the film substrate 55, and the same kind of the substrate disposed so as to cover the film substrate 55 on which the temperature sensor portion 56 is formed. The MEMS sensor includes a film cover 57 made of a polymer material (synthetic resin), and has a rectangular structure with a thin flat surface and a flexible structure as a whole.

  As shown in FIG. 5A, the film-shaped temperature sensor unit 56 is configured by a band-shaped part having an overall width a and a width b, and the band-shaped part having a width b is used to ensure a long overall band-shaped length. Wrapped at multiple locations. A pair of wiring attachment portions 58 and 58 are provided wider than the width b at both ends of a band-shaped portion having a width b located below the left and right ends in the figure of the film-like temperature sensor portion 56.

  In the film cover 57 covering the film substrate 55, holes 59 are formed as shown in FIG. 5C at positions corresponding to the pair of wiring attachment portions 58, 58 in FIG. A pair of wiring attachment portions 58 and 58 are exposed on the surface of the film cover 57 as shown in FIG. In addition, as shown to Fig.6 (a)-(c), you may arrange | position the film cover 57 so that a pair of wiring attachment part 58 may be exposed in the surface. A pair of electrical wirings 53 are electrically connected to the pair of wiring attachment portions 58 and 58. In the temperature detection unit 54, temperature measurement is performed based on the resistance value of the temperature sensor unit 56 that changes due to a temperature change.

  As described above, the temperature sensor 52 includes the film-shaped temperature sensor portion 56 formed on the film substrate 55 and the wiring attachment portion 58 exposed on the surface of the film cover 57, so that it is thinner than the conventional chip type laminated thermistor. Since it is flexible and small, there is no restriction on the mounting position of the temperature sensor 52. Therefore, the temperature sensor 52 can be disposed in the vicinity of the contact point p between the outer ring 61 and the ball 63, temperature measurement can be performed while suppressing the influence of the cooling oil, and the temperature detection response is improved. Further, since the film-shaped temperature sensor unit 56 is covered with the film cover 57, there is little risk of deterioration of the temperature sensor 52, and since the entire temperature sensor 52 has a flexible structure, there is no risk of cracking and durability. Can be improved.

In particular, since the temperature sensor 52 is attached to the inner peripheral surface 61a on the counter bore side of the outer ring 61, it interferes with the cage 64 guided by the outer ring on the inner peripheral surface 61b on the counter-counter side constituting the cage guide surface. Can be reliably prevented.
The temperature sensor 52 may be attached to another front bearing 70 or the rear bearing 80 instead of the front bearing 60, or may be attached to each bearing. Further, as the temperature sensor 52, a film sensor using other members such as a thermocouple and a thermistor may be used in addition to the above-described one.

  Further, when the temperature detection unit 54 detects an abnormal temperature rise of the bearing 60 based on the measured temperature data, the operation state of the bearing 60 is controlled so as to prevent seizure of the bearing 60. Specifically, as shown in FIG. 1, the rotation of the main shaft is decelerated or stopped by the motor control unit 31, or the discharge timing and the amount of lubricating oil are controlled by the lubricating device 91.

  Therefore, according to the spindle device bearing 60 of the machine tool of the present embodiment, the temperature sensor 52 is disposed in the vicinity of the contact point p between the outer ring 61 and the ball 63 so as to be detachable from the bearing 60 without being bonded. In addition to being able to measure temperature with high responsiveness, the temperature sensor 52 and the bearing 60 can be easily separated at the assembly site of the spindle device 20 and the like, and the maintenance and handling properties are excellent.

  The temperature sensor 52 is attached to the groove 92 a of the fixing plate 92, and the temperature sensor 52 contacts the outer ring 61 and the ball 63 by fastening the fixing member 92 to the outer ring 61 with a small screw 93. It is arranged near the point p. That is, by fixing the temperature sensor 52 to the fixing member 92 and fastening and fixing the fixing member 92 to the outer ring 61, the temperature sensor 52 is fixed to the outer ring 61 without applying pressure, so that the pressure changes. The temperature sensor 52 can be fixed without affecting the measurement of the MEMS sensor whose output changes.

  Further, since the fixing member 92 is attached together with the temperature sensor 52 to a groove formed on the inner peripheral surface of the outer ring, the temperature sensor 52 protrudes radially inward from the counter bore side inner peripheral surface 61a. It is possible to prevent the lubricating oil from staying and reduce the risk of abnormal temperature rise.

(Second Embodiment)
7 to 9 show a spindle device bearing for a machine tool according to a second embodiment of the present invention. In the second to fourth embodiments, the temperature sensor mounting structure is different from that of the first embodiment. Therefore, in each embodiment, only the vicinity of the front bearing to which the temperature sensor is attached is illustrated, and the same parts as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted or simplified.

  In the front bearing 60a of this embodiment, a notch groove 61e having a predetermined width is formed in a part of the axial side surface of the outer ring 61 on the counter bore side. Further, a sensor housing hole 61f extending in the axial direction to the vicinity of the position intersecting the line forming the contact angle of the ball 63 is formed at the substantially central portion in the circumferential direction of the notch groove 61e, and the sensor housing hole 61f. A pair of female screw holes 61g are formed extending in the axial direction on both sides (see FIG. 9B).

  The temperature sensor 52 is attached to the tip of a columnar fixing jig (fixing member) 94 inserted into the sensor receiving hole 61f. Then, the fixing jig 94 is inserted into the sensor receiving hole 61f, and the small screw 93 is inserted into the female screw hole 61g and fastened in a state where the base side flange 94a of the fixing jig 94 is disposed in the notch groove 61e. Thus, the temperature sensor 52 is fixed to the outer ring 61 together with the fixing jig 94.

Therefore, also in this embodiment, the temperature sensor 52 is disposed in the vicinity of the contact point p between the outer ring 61 and the ball 63, and temperature measurement with high responsiveness is possible. In addition, since the temperature sensor 52 is detachably disposed with the bearing 60a without being bonded by the fixing jig 94, the temperature sensor 52 and the bearing 60 can be easily separated at the assembly site of the spindle device 20, etc. Further, the machine screw 93 can be fastened from the axial direction of the outer ring 61, and the temperature sensor 52 can be fixed even after the bearing 60 is assembled to the front housing 50.
Other configurations and operations are the same as those in the first embodiment.

(Third embodiment)
FIG. 10 shows a spindle device bearing for a machine tool according to a third embodiment of the present invention. In the front bearings 60b and 70b of this embodiment, sensor housing holes 61h and 71h extending in the radial direction from the outer peripheral surfaces of the outer rings 61 and 71 to the vicinity of the contact point p are formed. The front housing 50 is formed with through holes 50c and 50c penetrating in the radial direction so as to communicate with the sensor receiving holes 61h and 71h, respectively. Recesses 50d and 50d extending on both sides in the circumferential direction are formed in the outer peripheral side openings of the through holes 50c and 50c.

  Thereby, after each fixing jig 94 having the temperature sensor 52 attached to the tip is inserted into the through holes 50c, 50c of the front housing 50 and the sensor receiving holes 61h, 71h of the outer rings 61, 71, the inside of the recesses 50d, 50d The fixing jig 94 is fixed to the outer rings 61, 71 by fastening the base side flange 94 a of the fixing jig 94 arranged in FIG. In FIG. 10, the cooling groove 50a is omitted in the front housing 50, but the through holes 50c, 50c may be formed at positions that do not interfere with the cooling groove 50a. The 50c and the sensor receiving holes 61h and 71h may be formed to be inclined with respect to the radial direction.

Therefore, also in this embodiment, the temperature sensor 52 is disposed in the vicinity of each contact point p between the outer rings 61 and 71 and the balls 63 and 73, and temperature measurement with high responsiveness is possible. Further, since the temperature sensor 52 is detachably attached to the bearings 60b and 70b by fastening the fixing jig 94 to the front housing 50, the temperature sensor 52 is assembled at the assembly site of the spindle device 20 or the like. And the bearings 60 and 70 can be easily separated, and the temperature sensor 52 can be fixed even after the bearings 60 and 70 are assembled to the front housing 50.
Other configurations and operations are the same as those in the first embodiment.

  As a modification of the present embodiment, as shown in FIG. 11, the front bearing 60 b ′ is provided with a sensor accommodation hole 61 i extending in the axial direction from the axial end surface of the outer ring 61 to the vicinity of the contact point p. A through hole 51a penetrating in the axial direction may be provided so as to communicate with the sensor receiving hole 61i, and the fixing jig 94 may be inserted from the axial direction. Accordingly, the fixing jig 94 to which the temperature sensor 52 is attached is inserted into the through hole 51 a of the front lid 51 and the sensor receiving hole 61 i of the outer ring 61, and the fixing jig 94 is inserted into the recess 51 b formed in the front lid 51. The fixing jig 94 is fixed to the outer ring 61 by fastening the base side rod 94 a with the small screw 93.

In addition, this invention is not limited to each embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.
In this embodiment, the front bearings 60 and 70 are two rows of angular ball bearings, and the rear bearing 80 is a cylindrical roller bearing. However, the type and number of rows of each bearing can be arbitrarily set.
Moreover, the rotating shaft of this invention may be a thing with which a workpiece is attached other than what a tool is attached.

Furthermore, in this embodiment, the fixing member is fastened to the outer ring or the housing and the temperature sensor 52 is disposed in the vicinity of the contact point p so that no pressure change occurs in the MEMS sensor. In the case where there is no effect on the measurement of the sensor even if the fastening portion is provided and fastened, the temperature sensor 52 may be directly fastened to the outer ring or the housing by the fastening member.
Moreover, as a fastening member, the snap action type restraint tool other than the screw member of this embodiment may be sufficient.

DESCRIPTION OF SYMBOLS 20 Main shaft apparatus 22 Rotating shaft 30 Rotor 32 Stator 40 Outer ring spacer 42 Inner ring spacer 52 Temperature sensor 53 Electrical wiring 60, 60a, 60b, 60b ', 70 Front bearing (angular ball bearing)
61, 71 Outer ring 61a Counter bore side inner peripheral surface 61b Counter counter side inner peripheral surface 61c Sensor receiving groove 61d, 61g Female threaded hole 61e Notch groove 61f, 61h, 61i Sensor receiving hole 80 Rear bearing (cylindrical roller bearing)
92 Fixing member 92a Storage part 93 Machine screw (fastening member)

Claims (6)

An inner ring having an inner ring raceway surface on the outer peripheral surface;
An outer ring having an outer ring raceway surface on the inner circumferential surface;
A plurality of rolling elements disposed between the inner ring raceway surface and the outer ring raceway surface;
A bearing for a spindle device of a machine tool that rotatably supports a rotating shaft with respect to a housing,
A bearing for a spindle device of a machine tool, wherein a temperature sensor is detachably disposed in the vicinity of a contact point between the outer ring and the rolling element. The temperature sensor is attached to the storage part of the fixing member,
2. The machine tool according to claim 1, wherein the temperature sensor is disposed in the vicinity of a contact point between the outer ring and the rolling element by fastening the fixing member to the outer ring with a fastening member. Bearing for main shaft equipment.   The bearing for a spindle device of a machine tool according to claim 2, wherein the fixing member is attached together with a temperature sensor to a groove portion formed on an inner peripheral surface of the outer ring. The temperature sensor is attached to a fixing member,
2. The machine tool according to claim 1, wherein the temperature sensor is disposed in the vicinity of a contact point between the outer ring and the rolling element by fastening the fixing member to the housing with a fastening member. Bearing for main shaft equipment. The bearing according to any one of claims 1 to 4,
The rotating shaft on which the inner ring is fitted;
The housing in which the outer ring is fitted;
A spindle device for a machine tool, comprising:   A machine tool comprising the spindle device according to claim 5.

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