JP2017009029A - Sensor-equipped bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sensor-equipped bearing which reduces costs related to replacement of the bearing and waste matters.SOLUTION: A sensor-equipped bearing 1 has: a bearing part 10 having an outer ring 11 fixed to an attachment object, an inner ring 12 which is disposed facing the outer ring 11 in a radial direction, and a plurality of rolling elements 13 arranged between the outer ring 11 and the inner ring 12; and a sensor unit 2 having sensor elements 21-23 for measuring physical quantities and attached to the outer ring 11. The sensor unit 2 includes a holder 4 having engaging protrusions 43 for attachment to the outer ring 11. The holder 4 and the sensor elements 21-23 may be integrally attached to and detached from the outer ring 11.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sensor-equipped bearing including a sensor for measuring a physical quantity.

  Conventionally, a sensor-equipped bearing including a sensor that detects a physical quantity such as vibration or temperature is used in, for example, a machine tool (see, for example, Patent Document 1). Such a sensor-equipped bearing can detect damage at an early stage by detecting abnormal vibration or temperature rise when a separation or seizure occurs on the raceway surface on which the rolling element rolls, by means of the sensor.

  In the sensor-equipped bearing described in Patent Document 1, a flat portion of a metal plate having an L-shaped cross section is fitted on an outer ring of the bearing, and a holding block is coupled to a vertical portion perpendicular to the flat portion. A sensor housing recess is formed in the holding block, and a sensor such as a vibration sensor or a temperature sensor is held in the sensor housing recess. The output signal of the sensor is sent to an external control device or the like by electric wiring.

JP 2003-278781 A

  In such a bearing with a sensor, if an abnormality is detected by the sensor, the bearing needs to be replaced. In the sensor-equipped bearing described in Patent Document 1, since the vibration sensor and the temperature sensor are fixed to the outer ring of the bearing via the holding block and the metal plate, these sensors are exchanged together with the bearing. . During this replacement, the sensor itself is normal, but is discarded together with the bearing. For this reason, the increase in the cost and waste accompanying replacement | exchange of a bearing was caused.

  This invention is made | formed in view of said situation, The objective is to provide the bearing with a sensor which can suppress the cost and waste accompanying replacement | exchange of a bearing.

  In order to achieve the above object, the present invention is arranged between a fixed wheel fixed to an object to be attached, a rotating wheel disposed to face the fixed wheel in a radial direction, and between the fixed wheel and the rotating wheel. A bearing unit having a plurality of rolling elements, and a sensor unit having a sensor element for measuring a physical quantity and attached to the fixed ring, the sensor unit having an attachment part for attachment to the fixed ring. There is provided a sensor-equipped bearing including an attachment member having the attachment member, and the attachment member and the sensor element can be integrally attached to and detached from the fixed ring.

  According to the present invention, even when the bearing portion needs to be replaced, it is possible to suppress the cost and waste associated with the replacement.

It is a section perspective view showing the bearing with a sensor concerning a 1st embodiment of the present invention. (A) And (b) is sectional drawing which expands and shows the cross section of a bearing with a sensor. It is a disassembled perspective view of a bearing with a sensor. It is the front view which looked at the bearing with a sensor from the axial direction. (A) is the elements on larger scale which looked at a part of outer wall part of the outer ring | wheel from the inner side. (B) is explanatory drawing which shows the state by which the latching claw part was inserted | pinched by the clamping part in the radial direction cross section of an outer ring | wheel. It is a section perspective view showing a bearing with a sensor concerning a 2nd embodiment of the present invention. It is a disassembled perspective view of the bearing with a sensor which concerns on 2nd Embodiment.

[First Embodiment]
A sensor-equipped bearing according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5. FIG. 1 is a cross-sectional perspective view showing a sensor-equipped bearing according to the present embodiment. 2A and 2B are cross-sectional views showing an enlarged cross section of the sensor-equipped bearing in FIG. FIG. 3 is an exploded perspective view of the sensor-equipped bearing. FIG. 4 is a front view of the sensor-equipped bearing as viewed from the axial direction.

  The sensor-equipped bearing 1 includes a bearing portion 10 and a sensor unit 2, and the sensor unit 2 is detachable from the bearing portion 10. Hereinafter, each structure of the bearing part 10 and the sensor unit 2 is demonstrated in detail.

(Bearing configuration)
The bearing portion 10 includes an outer ring 11, an inner ring 12 that is arranged to face the outer ring 11 in the radial direction, a plurality of rolling elements 13 that are arranged between the outer ring 11 and the inner ring 12, and a plurality of rolling elements 13. It has a cage 14 that is held so as to be able to roll, first and second metal seals 15, 16, and a pulsar ring 17 fitted to the inner ring 12. In the present embodiment, the outer ring 11 is a fixed wheel that is fixed to an attachment target, and the inner ring 12 is a rotating wheel that can rotate relative to the outer ring 11.

  The outer ring 11 is fixed by being press-fitted into a bearing fitting portion formed on a non-rotating member in a machine tool, for example. The outer ring 11 includes a main body 110 having an outer raceway surface 110a on which the rolling element 13 rolls on an inner peripheral surface, and an annular outer wall 111 formed so as to protrude in the axial direction from an outer peripheral portion on one side surface of the main body 110. Is integrated.

  The inner ring 12 is disposed inside the outer ring 11. For example, a shaft of a machine tool is fitted in the center of the inner ring 12 and rotates together with the shaft. The inner ring 12 includes a main body 120 having an inner raceway surface 120a on which the rolling element 13 rolls on the outer peripheral surface, and an annular inner wall formed by protruding in an axial direction from the inner peripheral portion of one side surface of the main body 120. 121 in an integrated manner.

  The rolling element 13 is disposed between the outer raceway surface 110 a of the outer ring 11 and the inner raceway surface 120 a of the inner ring 12. In the present embodiment, the case where the rolling element 13 is spherical will be described. However, the present invention is not limited to this, and a cylindrical roller may be used as the rolling element 13. The cage 14 holds a plurality of rolling elements 13 at equal intervals. The rolling element 13 and the outer ring 11 and the inner ring 12 are made of, for example, bearing steel.

  The first and second metal seals 15 and 16 are formed by punching a metal plate such as stainless steel in an annular shape, and are fitted to the main body 120 of the inner ring 12. The first metal seal 15 is fitted to the end of the main body 120 on the side where the inner wall 121 is provided, and the second metal seal 16 is the main body opposite to the side where the inner wall 121 is provided. The end of the portion 120 is fitted. The first and second metal seals 15 and 16 prevent foreign matter such as chips from entering between the main body 110 of the outer ring 11 and the main body 120 of the inner ring 12, and the main body 110 of the outer ring 11. Leakage of lubricating oil (grease) (not shown) sealed between the inner ring 12 and the main body 120 is suppressed.

  The pulsar ring 17 is an annular member made of a magnetic material such as iron. As shown in FIG. 3, the pulsar ring 17 has a ring portion 170 formed in an annular shape and a plurality of tongues formed so as to protrude from the ring portion 170 in the axial direction. It has the piece 171 integrally. The ring portion 170 is fitted to the outside of the inner wall portion 121 of the inner ring 12 and is fixed to the inner ring 12 by welding or adhesion. The tongue piece 171 protrudes from the ring portion 170 toward the main body portion 120 of the inner ring 12.

  The outer wall 111 of the outer ring 11 and the inner wall 121 of the inner ring 12 face each other in the radial direction. As shown in FIG. 2A, the outer peripheral surface 111a of the outer wall 111 and the outer peripheral surface 121a of the inner wall 121 An annular storage space 100 for disposing the pulsar ring 17 and the sensor unit 2 is formed between them. A circumferential groove 112 and a plurality of introduction holes 113 communicating with the circumferential groove 112 are formed on the inner circumferential surface 111a of the outer wall 111 (see FIG. 3). Details of the circumferential groove 112 and the introduction hole 113 will be described later.

(Configuration of sensor unit)
The sensor unit 2 has a sensor element that measures a physical quantity, and is attached to the outer ring 11. In the present embodiment, the sensor unit 2 includes a temperature sensor 21 for measuring temperature, a magnetic sensor 22 for detecting the rotation speed of the inner ring 12 relative to the outer ring 11, and an acceleration sensor 23 for detecting vibration. It has as a sensor element.

  The sensor unit 2 supports the printed circuit board 3 on which the temperature sensor 21, the magnetic sensor 22, and the acceleration sensor 23 are mounted on the mounting surface 3 a, and an attachment member for mounting the sensor unit 2 to the outer ring 11. The holder 4 is provided. In the sensor unit 2, the holder 4, the printed circuit board 3, the temperature sensor 21, the magnetic sensor 22, and the acceleration sensor 23 are detachably attached to the outer ring 11. Here, “detachable integrally” means that the holder 4, the printed circuit board 3, the temperature sensor 21, the magnetic sensor 22, and the acceleration sensor 23 can be attached to and detached from the bearing unit 10 in one operation. . Various electronic components 20 such as resistors, capacitors or ICs other than the sensor elements are mounted on the printed circuit board 3, and these electronic components 20 are also used together with the temperature sensor 21, the magnetic sensor 22, and the acceleration sensor 23. It is attached to and detached from the outer ring 11.

  The printed circuit board 3 is formed by etching a copper foil with an unillustrated wiring pattern and electrodes on the surface of a plate-like insulator made of, for example, glass epoxy. In the present embodiment, the printed circuit board 3 has an annular plate shape, and first to fourth cutouts 31 to 34 and a pair of through holes 35 and 36 are formed.

  The holder 4 is an annular member formed along the circumferential direction of the outer ring 11, and includes a bottom plate portion 40, an outer peripheral wall portion 41, an inner peripheral wall portion 42, and a plurality of engagements erected on the bottom plate portion 40. The projection 43 and the surrounding wall portion 44 formed so as to surround the engagement projection 43 are integrally provided. The holder 4 is made of synthetic resin and is formed by, for example, injection molding.

  The holder 4 is disposed in the accommodation space 100 of the bearing portion 10 so that the bottom plate portion 40 faces the first metal seal 15. A rectangular through hole 400 is formed in the bottom plate portion 40 at a position corresponding to the temperature sensor 21 mounted on the printed circuit board 3.

  In the present embodiment, three engagement protrusions 43 are erected on the bottom plate portion 40. As shown in FIG. 2A, the engagement protrusion 43 includes a column portion 430 that extends in a direction perpendicular to the bottom plate portion 40, and a protrusion that protrudes radially outward from the tip portion of the column portion 430. And a pawl portion 431. Each engagement protrusion 43 functions as an attachment portion for attaching the sensor unit 2 to the outer ring 11. The surrounding wall portion 44 is formed at a predetermined interval from the engagement protrusion 43 so as to surround the engagement protrusion 43 from three directions. Note that the number of the engagement protrusions 43 is not limited to three, and may be four or more.

  The outer peripheral wall portion 41 protrudes from the outer peripheral end of the bottom plate portion 40 in the axial direction, and is provided between the surrounding wall portions 44 formed corresponding to the three engaging protrusions 43. The locking claw portion 431 of the engaging protrusion 43 protrudes outward in the radial direction from the outer peripheral wall portion 41. The inner peripheral wall portion 42 protrudes in the axial direction from the inner peripheral end of the bottom plate portion 40 and is formed in an annular shape.

  The printed circuit board 3 is disposed between the outer peripheral wall portion 41 and the surrounding wall portion 44 and the inner peripheral wall portion 42 so that the mounting surface 3 a faces the bottom plate portion 40. The printed circuit board 3 is positioned with respect to the holder 4 so that the surrounding wall portions 44 are accommodated in the first to third cutouts 31 to 33, respectively. A sealing resin 50 is filled between the bottom plate portion 40 and the mounting surface 3 a of the printed circuit board 3, and the printed circuit board 3 and the holder 4 are coupled together by the sealing resin 50. The sealing resin 50 is made of, for example, an epoxy resin or an acrylic resin, and seals each component such as the mounting surface 3a of the printed board 3 and the sensor element mounted on the mounting surface 3a.

  A cable 6 is connected to the printed circuit board 3. The cable 6 is configured by covering a plurality of electric wires with a sheath, and the plurality of electric wires are inserted into the fourth notch 34 of the printed board 3 and connected to an unillustrated electrode formed on the mounting surface 3a. Yes. A space between the outer peripheral surface of the cable 6 and the inner surface of the fourth notch 34 is sealed with a sealing material 51. Further, the sealing material 51 is provided between the peripheral edge portion of the printed circuit board 3 on the non-mounting surface 3b side opposite to the mounting surface 3a and the outer peripheral wall portion 41, the inner peripheral wall portion 42, and the surrounding wall portion 44 of the holder 4. Is also applied. The sealing material 51 is made of the same resin as the sealing resin 50, for example.

  The cable 6 transmits electric signals indicating detection results of the temperature sensor 21, the magnetic sensor 22, and the acceleration sensor 23 to a control device (not shown). The control device can recognize the temperature of the bearing unit 10 based on the electrical signal indicating the detection result of the temperature sensor 21. Further, the control device can recognize the rotational speed of the inner ring 12 based on the electrical signal indicating the detection result of the magnetic sensor 22. Furthermore, the control device can recognize the vibration of the bearing unit 10 based on the electrical signal indicating the detection result of the acceleration sensor 23. The control device performs an abnormality diagnosis of the bearing unit 10 based on the recognized temperature and vibration of the bearing unit 10, and when it is determined that an abnormality has occurred in the bearing unit 10 and needs to be replaced, a signal to that effect. To emit.

  As shown in FIG. 2B, the temperature sensor 21 is in contact with the heat conducting member 8 partially accommodated in the through hole 400 formed in the bottom plate portion 40 of the holder 4. The heat conducting member 8 is an elastic body having excellent heat conductivity, and is in elastic contact with the first metal seal 15 of the bearing portion 10. The temperature sensor 21 is thermally coupled to the first metal seal 15 via the heat conducting member 8 and detects the heat of the bearing portion 10.

  The magnetic sensor 22 includes a magnet that forms a static magnetic field, and a magnetic field detector that detects a change in magnetic field strength due to the approach and separation of the tongue piece 171 of the pulsar ring 17 accompanying the rotation of the inner ring 12. Along with this, a pulsed electric signal having a different potential is output when the tongue 171 approaches the magnetic sensor 22 and when the tongue 171 approaches the magnetic sensor 22.

  The acceleration sensor 23 detects the vibration of the bearing unit 10 as acceleration, and outputs an electrical signal with stronger strength as the acceleration increases. Note that one each of the temperature sensor 21, the magnetic sensor 22, and the acceleration sensor 23 may be mounted on the printed board 3, or a plurality may be mounted on the printed board 3.

(Mounting structure of sensor unit to bearing)
Next, the mounting structure of the sensor unit 2 to the bearing portion 10 will be described with reference to FIG. The sensor unit 2 is attached by positioning the sensor unit 2 with respect to the bearing portion 10 so that the engagement protrusion 43 of the holder 4 faces the introduction hole 113 formed in the outer wall portion 111 of the outer ring 11. After being arranged in the housing space 100 of the bearing part 10, the bearing part 10 and the sensor unit 2 are rotated relative to each other.

  In FIG. 4, the circumferential groove 112 of the outer ring 11 is indicated by a broken line. In the present embodiment, the circumferential groove 112 extends in the circumferential direction of the outer ring 11 and is formed in an annular shape over the entire circumference of the outer wall portion 111. The circumferential groove 112 is formed so as to be recessed from the inner peripheral surface 111a of the outer wall portion 111 toward the outer side in the radial direction. The groove depth d of the circumferential groove 112 is, for example, 0.5 mm.

  The introduction hole 113 is provided to introduce the locking claw portion 431 provided on the engagement protrusion 43 of the holder 4 into the circumferential groove 112, and is formed on the axial end surface of the outer ring 11 (the distal end surface 11 b of the outer wall portion 111). An opening 113a is provided. Similarly to the circumferential groove 112, the introduction hole 113 is formed so as to be recessed from the inner circumferential surface 111a of the outer wall portion 111 toward the outer side in the radial direction. The depth of the introduction hole 113 in the radial direction of the outer ring 11 is the same as the groove depth d of the circumferential groove 112.

  When the sensor unit 2 is aligned with the bearing portion 10 as described above and the sensor unit 2 is pushed into the housing space 100 until the bottom plate portion 40 of the holder 4 abuts against the first metal seal 15, 43 locking claws 431 are disposed in the circumferential groove 112 at a portion communicating with the introduction hole 113. Then, when the sensor unit 2 is rotated by a predetermined angle (for example, 60 °) in the arrow A direction shown in FIG. 4 with respect to the bearing portion 10 from this state, the locking claw portion 431 is locked to the circumferential groove 112. . In FIG. 4, the locking claw portion 431 in the circumferential groove 112 is indicated by a broken line. The operation of rotating the sensor unit 2 can be easily performed using a tool having a pair of protrusions fitted into the pair of through holes 35 and 36 formed in the printed circuit board 3.

  In this way, the locking claw portion 431 is locked to the outer ring 11, whereby the axial movement of the sensor unit 2 with respect to the bearing portion 10 is restricted. That is, the sensor unit 2 is prevented from coming off from the housing space 100 of the bearing portion 10. Further, the radial movement of the sensor unit 2 with respect to the bearing portion 10 is restricted by contact between the outer peripheral wall portion 41 of the holder 4 and the inner peripheral surface 111 a of the outer wall portion 111.

  Further, the rotation of the sensor unit 2 with respect to the bearing portion 10 is prevented by the engagement claw portion 431 being sandwiched in the sandwiching portion 112a formed so that the width of the circumferential groove 112 in the radial direction of the outer ring 11 is narrowed. . The structure for preventing the rotation will be described in detail with reference to FIG.

  FIG. 5A is a partially enlarged view of a part of the outer wall 111 of the outer ring 11 as viewed from the inside. FIG. 5B is an explanatory diagram showing a state where the locking claw portion 431 is sandwiched between the sandwiching portions 112 a in the radial cross section of the outer ring 11.

  As shown in FIG. 5A, the width w of the circumferential groove 112 in the radial direction of the outer ring 11 is slightly narrower than the thickness t of the locking claw portion 431 in the clamping portion 112a. Slope surfaces 112b are formed on both sides of the holding portion 112a in the circumferential direction of the outer ring 11 to guide the locking claw portion 431 to the holding portion 112a. The width of the circumferential groove 112 in the slope portion 112b becomes narrower as it approaches the sandwiching portion 112a.

  The locking claw portion 431 is introduced into the circumferential groove 112 from the introduction hole 113, and is thereafter sandwiched between the clamping portions 112 a by the relative rotation of the sensor unit 2 with respect to the outer ring 11. That is, it is clamped by the clamping part 112a. Thereby, rotation with respect to the bearing part 10 of the sensor unit 2 is made. The sandwiching portions 112 a are formed at three locations corresponding to the intermediate positions of the three introduction holes 113 in the circumferential direction of the outer ring 11. Thereby, when the sensor unit 2 rotates relative to the outer ring 11, the respective locking claws 431 of the three engaging protrusions 43 are simultaneously sandwiched between the sandwiching portions 112a.

  The sensor-equipped bearing 1 is used by being assembled in a machine tool or the like with the sensor unit 2 mounted on the bearing portion 10 in this manner. And when it is judged that it is necessary to replace the bearing part 10 by the wear etc. by long-term use etc., the sensor unit 2 is removed from the bearing part 10, and only the bearing part 10 is replaced | exchanged.

  For example, the sensor unit 2 is removed by rotating the sensor unit 2 in the direction opposite to the rotation direction (arrow A direction) when the sensor unit 2 is attached and aligning the locking claw 431 with the introduction hole 113. Thus, the sensor unit 2 can be pulled out of the housing space 100 along the axial direction of the bearing portion 10.

  The sensor unit 2 removed from the bearing unit 10 is attached to a new replacement bearing unit 10 by the same procedure as described above and reused.

(Operation and effect of the first embodiment)
According to the first embodiment described above, the following operations and effects can be obtained.

(1) Even if it is necessary to replace the bearing unit 10, the sensor unit 2 does not need to be replaced. That is, since the sensor unit 2 can be reused, it is possible to suppress the cost and waste associated with the replacement of the bearing portion 10.

(2) Since the mounting surface 3a side of the printed circuit board 3 is sealed with the sealing resin 50 in the sensor unit 2, a sensor element (temperature sensor 21) in which foreign matter such as chips or lubricating oil is mounted on the mounting surface 3a. , The magnetic sensor 22 and the acceleration sensor 23) and the electronic component 20 are not attached. Thereby, the normal operation of the sensor unit 2 can be ensured even when the sensor-equipped bearing 1 is used in a machine tool, for example.

(3) The holder 4 is an annular shape formed along the circumferential direction of the outer ring 11, and the locking claw portion 431 fixed to the outer ring 11 protrudes in the radial direction, so that the fixing to the outer ring 11 is ensured. Made. Further, since the outer ring 11 is formed with a circumferential groove 112 for locking the locking claw portion 431 and an introduction hole 113 for introducing the locking claw portion 431 into the circumferential groove 112, the outer ring of the sensor unit 2 is formed. It is easy to attach to and detach from 11.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS. The sensor-equipped bearing 1 according to the second embodiment is different from the first embodiment in that the sensor unit 2 is detachable when the holder 4 is screwed to the bearing portion 10.

  FIG. 6 is a cross-sectional perspective view showing the sensor-equipped bearing 1 according to the present embodiment. FIG. 7 is an exploded perspective view of the sensor-equipped bearing 1 according to the present embodiment. 6 and 7, the same components as those described in the first embodiment are denoted by the same reference numerals as those used in FIGS. 1 to 4, and redundant description thereof is omitted.

  In the present embodiment, a male screw 410 is formed on the outer periphery of the outer peripheral wall portion 41 of the holder 4. The number of threads of the male screw 410 is one for example, but may be two or more. On the inner periphery of the outer wall 111 in the outer ring 11, a female screw 114 to which the male screw 410 of the holder 4 is screwed is formed.

  The sensor unit 2 according to the present embodiment can be attached to and detached from the bearing portion 10 by relative rotation with the bearing portion 10. That is, when the sensor-equipped bearing 1 is assembled, the sensor unit 2 can be rotated in one direction with respect to the bearing portion 10, and when the sensor unit 2 is removed from the bearing portion 10, Rotates the sensor unit 2 and the bearing portion 10 in the opposite direction.

  Also according to this embodiment, the same operations and effects as (1) and (2) described in the first embodiment can be obtained. Moreover, since the sensor unit 2 can be attached to and detached from the bearing portion 10 by screwing the holder 4 to the outer ring 11, it is possible to increase the attachment strength of the sensor unit 2 to the bearing portion 10.

(Appendix)
As mentioned above, although this invention was demonstrated based on 1st and 2nd embodiment, this invention is not limited to these embodiment, It deform | transforms suitably and implements in the range which does not deviate from the summary. It is possible.

  For example, in the first and second embodiments, the case where the outer ring 11 is a fixed ring and the inner ring 12 is a rotating ring has been described. Conversely, the inner ring 12 is a fixed ring and the outer ring 11 is rotated. It may be a ring. In this case, the holder 4 is fixed to the inner ring which is a fixed ring, and the fixing method can be the same as that of the first embodiment or the second embodiment.

  The sensor unit 2 may not include all of the temperature sensor 21, the magnetic sensor 22, and the acceleration sensor 23 as sensor elements. Moreover, you may add the sensor element which can detect another physical quantity.

DESCRIPTION OF SYMBOLS 1 ... Bearing with sensor, 10 ... Bearing part, 100 ... Housing space, 11 ... Outer ring, 110 ... Main body part, 110a ... Outer raceway surface, 111 ... Outer wall part, 111a ... Inner peripheral surface, 112 ... Circumferential groove, 113 ... Introducing hole, 113a ... opening, 11b ... tip surface, 12 ... inner ring, 120 ... main body, 120a ... inner raceway surface, 121 ... inner wall, 121a ... outer peripheral surface, 13 ... rolling element, 14 ... retainer, 15 ... first DESCRIPTION OF SYMBOLS 1 metal seal, 16 ... 2nd metal seal, 17 ... Pulsar ring, 170 ... Ring part, 171 ... Tongue piece, 2 ... Sensor unit, 20 ... Electronic component, 21 ... Temperature sensor, 22 ... Magnetic sensor, 23 ... Acceleration sensor, 3 ... Printed circuit board (board), 35, 36 ... Through hole, 3a ... Mounting surface, 3b ... Non-mounting surface, 4 ... Holder (mounting member), 40 ... Bottom plate part, 400 ... Through hole, 41 ... Outer periphery Wall part, 42 ... Inner wall , 43 ... engaging projection, 430 ... pillar portion, 431 ... locking claw portion, 44 ... surrounding wall portion, 50 ... sealing resin, 51 ... sealing material, 6 ... cable, 8 ... heat conduction member

In order to achieve the above object, the present invention is arranged between a fixed wheel fixed to an object to be attached, a rotating wheel disposed to face the fixed wheel in a radial direction, and between the fixed wheel and the rotating wheel. A bearing unit having a plurality of rolling elements, and a sensor unit having a sensor element for measuring a physical quantity and attached to the fixed ring, the sensor unit having an attachment part for attachment to the fixed ring. The mounting member and the sensor element are detachably attached to the fixed ring integrally, and the mounting member is an annular shape formed along a circumferential direction of the fixed ring, A locking claw portion that is locked to the fixed ring protrudes in the radial direction and is provided in the mounting portion, and a groove that locks the locking claw portion extends in the circumferential direction on the fixed ring. And the groove has a leading hole for introducing the locking claw portion. The fixed ring has an opening at an axial end surface, and has a holding portion that is formed so that a width in the axial direction of the fixed ring is narrowed to hold the locking claw, and the fixed ring Provided is a sensor-equipped bearing in which a width of the clamping portion in the axial direction is narrower than a thickness of the locking claw portion in the axial direction of the fixed ring .

In addition, the rotation of the sensor unit 2 with respect to the bearing portion 10 is prevented by sandwiching the locking claw portion 431 into the holding portion 112a formed so that the width of the circumferential groove 112 in the axial direction of the outer ring 11 is narrowed. . The structure for preventing the rotation will be described in detail with reference to FIG.

As shown in FIG. 5A, the width w of the circumferential groove 112 in the axial direction of the outer ring 11 is formed slightly narrower than the thickness t of the locking claw portion 431 in the clamping portion 112a. Slope surfaces 112b are formed on both sides of the holding portion 112a in the circumferential direction of the outer ring 11 to guide the locking claw portion 431 to the holding portion 112a. The width of the circumferential groove 112 on the slope surface 112b becomes narrower as it approaches the sandwiching portion 112a.

Claims (5)

A fixed ring fixed to an object to be mounted, a rotating wheel arranged in a radial direction opposite to the fixed wheel, and a bearing portion having a plurality of rolling elements arranged between the fixed wheel and the rotating wheel;
A sensor unit for measuring a physical quantity, and a sensor unit attached to the fixed ring,
The sensor unit includes an attachment member having an attachment portion for attachment to the fixed wheel, and the attachment member and the sensor element can be integrally attached to and detached from the fixed wheel.
Bearing with sensor. The sensor unit further includes a substrate on which the sensor element is mounted on a mounting surface, and the mounting surface of the substrate is sealed with a sealing resin,
The substrate and the mounting member are combined by the sealing resin,
The sensor-equipped bearing according to claim 1. The mounting member is an annular shape formed along a circumferential direction of the fixed ring, and a locking claw portion locked to the fixed ring protrudes in a radial direction and is provided in the mounting portion.
The sensor-equipped bearing according to claim 2. A groove for locking the locking claw portion extends in the circumferential direction in the fixed ring, and an introduction hole for introducing the locking claw portion into the groove is formed in the axial end surface of the fixed wheel. Formed with openings,
The bearing with a sensor of Claim 3. The sensor unit is an annular shape formed along the circumferential direction of the fixed ring, and a screw portion that is screwed to the fixed ring is formed as the attachment portion on the peripheral surface thereof.
The sensor-equipped bearing according to claim 2.

Images