JP2013061030A - Bearing with rotation sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing with a rotation sensor including the self power generation function in which a guidance electromotive part is stored compactly.SOLUTION: This bearing includes a magnetic sensor unit 2 mounted on a bearing ring 1 on one side and a pulser ring 4 made rotate integrally with a bearing ring 3 on the other side and includes a sensor case 12 where, as constitutive members of the magnetic sensor unit 2, the magnetic sensor 7 facing the pulser ring 4, a back magnet 8 giving a bias magnetic field from rear of the magnetic sensor 7, a coil 9 in which induced electromotive force is generated by the change of the bias magnetic field, and a power supply circuit unit 10 generating a direct current power supply from the induced electromotive force to supply to the magnetic sensor 7 are all stored, wherein the coil 9 is arranged, while facing the coil axis thereof to the countering direction of the magnetic sensor 7 and the pulser ring 4 to surround the circumference of the back magnet 8 and to be further away from the pulser ring 4 than the magnetic sensor 7 in the countering direction.

Description

  The present invention relates to a rotation sensor bearing including a rolling bearing and a magnetic rotation sensor.

  Typical examples of this type of bearing with a rotation sensor include those used for motor shaft, rotation speed control, rotation direction control, rotation angle control, etc. of an automobile axle. In a bearing with a rotation sensor, one bearing ring that constitutes a rolling bearing is a stationary bearing ring that is fitted to a fixed member such as a motor housing or an automobile suspension, and the other bearing ring is fixed to the fixed member. Thus, the rotating side ring is attached to a rotating side member that rotates about the axis. This type of bearing with a rotation sensor incorporates a rolling bearing between a rotating shaft such as the motor shaft and a stationary member such as a housing stationary with respect to the rotating shaft, and one of the inner and outer rings fitted to the stationary member. The magnetic sensor unit is supported on the raceway side peripheral surface of the raceway, and the encoder that forms a gap with the magnetic sensor fixed to the magnetic sensor unit is rotated integrally with the other raceway attached to the rotary shaft. The encoder converts the rotational motion of the other race ring and the rotating shaft into a change in magnetic field detected by a magnetic sensor. The detection signal of the magnetic sensor is transmitted to an external device and used for rotation speed control, rotation direction control, rotation angle control, and the like of the rotation shaft by the external device.

  Some encoders use pulsar ring. Pulsaring is a magnetic material in which a first changing portion that forms the shortest gap in the facing direction with the magnetic sensor and a second changing portion that forms a larger space in the facing direction than the first changing portion are alternately continuous in the circumferential direction. It consists of material parts and cannot generate a magnetic field with a single pulsar ring. For this reason, a back magnet for applying a bias magnetic field is disposed behind the magnetic sensor. The magnetic field which a magnetic sensor detects changes because a 1st change part and a 2nd change part alternately pass a bias magnetic field.

  Conventionally, a bearing with a rotation sensor to which a self-power generation function is added using a bias magnetic field of a back magnet has been proposed (Patent Document 1). In Patent Document 1, the power generation coil is fixed to the magnetic sensor unit so as to be located in the bias magnetic field, and the change in the bias magnetic field generated during the bearing operation becomes the change in the magnetic flux passing through the coil. An induced electromotive force based on the law of electromagnetic induction is generated in the coil, and a power supply circuit unit that supplies power from the electromotive force as a magnetic sensor is also fixed to the magnetic sensor unit (Patent Document 1).

JP 2006-64094 A

  However, since the coil is arrange | positioned in the clearance gap where a magnetic sensor and a pulsar ring oppose the thing of patent document 1, in order to accommodate a magnetic sensor and a coil in a magnetic sensor unit, a large space is required. In addition, since a yoke for guiding the magnetic flux passing through the coil to be reduced is overlapped behind the back magnet, a space for accommodating the yoke is also required.

  Therefore, the problem to be solved by the present invention is to compactly accommodate the induction electromotive section in the rotation sensor-equipped bearing having a self-power generation function.

  To achieve the above object, the present invention comprises a magnetic sensor unit mounted on one of the inner and outer race rings, and a pulsar ring that is rotated integrally with the other inner and outer race rings, and as a component of the magnetic sensor unit A magnetic sensor facing the pulsar ring, a back magnet for applying a bias magnetic field from behind the magnetic sensor, a coil for generating an induced electromotive force due to a change in the bias magnetic field, and generating a DC power source from the induced electromotive force, In a bearing with a rotation sensor including a sensor case in which a power supply circuit unit that supplies a magnetic sensor is housed, the coil has a periphery of the back magnet with the direction of the coil axis as a facing direction of the magnetic sensor and the pulsar ring. Surrounding and farther in the opposite direction from the pulsar ring than the magnetic sensor It is obtained by employing the configuration as sea urchin arranged.

  According to the above configuration, the coil for power generation is arranged so that the direction of the coil axis is the facing direction of the magnetic sensor and the pulsar ring, surrounds the back magnet, and is farther away from the pulsar ring than the magnetic sensor. Therefore, the coil does not protrude in the opposite direction than the magnetic sensor, and the coil is accommodated around the back magnet, so that the induction electromotive unit can be accommodated compactly (particularly in the opposite direction). In addition, since the coil is not positioned in the gap between the pulsar ring and the magnetic sensor, the magnetic flux passing through the coil can be sufficiently reduced, and the yoke can be omitted.

  As a constituent member of the magnetic sensor unit, a sensor support base supported by one of the race rings, the sensor case combined with the sensor support base, and the sensor case combined with the sensor support base fixed to the sensor support base It is preferable that the sensor case can be separated from the sensor support base by a release operation with respect to the auxiliary member. When the bearing or one of the bearing rings reaches the end of its life, generally, the magnetic sensor, the elements constituting the power supply circuit unit, the coil, the back magnet, and the sensor case have a sufficient life for reuse. If the combination of the sensor case and sensor support base is released by the release operation for the auxiliary member and the sensor case can be separated, the combined surface of the separated sensor case will not be roughened after adhesive separation and reused as it is can do.

  For example, when the auxiliary member is formed of a male screw member, the sensor case can be separated only by extracting the male screw member.

  More specifically, when the sensor case is combined with the sensor support base from the axial direction and is screwed to the side surface of the sensor support base from the axial direction, the auxiliary is supported from the axial direction without separating the inner and outer rings. By releasing the member, the sensor case can be separated from the sensor support base in the axial direction.

  The sensor case has a cylindrical storage chamber having a closed end wall on the side facing the pulsar ring, and the magnetic sensor, the back magnet, the coil, and the power supply circuit section in the storage chamber. Can be used. By accommodating in the storage chamber, protection of elements, coils, and the like can be achieved, and if necessary, a filler can be inserted into the storage chamber to enhance protection. In order to reduce the gap in the facing direction between the pulsar ring and the magnetic sensor, the closed end wall is formed with a thin portion with a reduced thickness in the facing direction, and a magnetic sensor utilizing the depression of the closed end wall associated with the formation is formed. Is preferably arranged. If the inner cylinder wall protruding so as to surround the thin wall portion is formed, the rigidity of the closed end wall in the vicinity of the thin wall portion can be enhanced by the inner cylinder wall. If a back magnet is disposed further inside the closed end wall, the inner periphery of the coil to be disposed around the back magnet can be supported by the inner cylinder wall, and the coil fixing can be strengthened.

  When a single electronic component having the back magnet fixed to the back surface of the sealing portion of the magnetic sensor is accommodated in the sensor case, the magnetic sensor and the back magnet can be simultaneously disposed by mounting one electronic component.

  In the present invention, the output signal of the magnetic sensor may be transmitted to an external device either wirelessly or by wire.

  If the transmitter that wirelessly transmits the output signal of the magnetic sensor and the power source of the transmitter are housed in the sensor case, the power line and the signal line that connect the sensor case and the external device become unnecessary, so the rotation sensor It becomes easy to install the attached bearing in the device.

  On the other hand, when an electric wire for connecting the magnetic sensor and an external device is provided, the sensor support base is preferably formed of an annular body that is slidably mounted in a circumferential direction with respect to the track-side peripheral surface. . If there is a concern that one of the bearing rings on which the magnetic sensor unit is mounted will cause creep, the magnetic sensor unit can be prevented from turning in the circumferential direction with a member that is stationary with respect to one of the bearing rings, preventing disconnection during creep. can do.

  More specifically, the sensor support base is configured to connect two divided pieces that sandwich the track-side peripheral surface in the radial direction and assemble it into an annular body. A circumferential groove portion extending in a direction, the divided piece has a protrusion that enters the circumferential groove portion, the sensor support base is hooked in the axial direction of the protrusion with respect to the circumferential groove portion, and the track-side circumferential surface It is preferable that it is mounted on the one raceway ring by fitting in the radial direction. The sensor support base can be mounted on the raceway by inserting the protrusions of the two divided pieces into the inside of the circumferential groove portion from the radial direction and connecting the two divided pieces. That is, as long as the sensor support base is maintained in an annular body, it is positioned in the axial direction with respect to the bearing by the hook of the protrusion and the circumferential groove, and is positioned in the radial direction with respect to the bearing by fitting with the peripheral surface of the track. Is done. Compared to a mounting structure in which the sensor support base is formed in an endless annular shape with a hard material and the protrusion is pushed inward from the axial direction over the groove edge, the protrusion is inserted into the peripheral groove from the radial direction. The sensor support base can be easily mounted.

  It is preferable that the two divided pieces are formed of molded parts having the same shape. Using the same two divided pieces, the divided pieces can be mass-produced with the same mold.

  More preferably, the sensor case can be attached to each of the divided pieces. Since the sensor case can be made sufficiently shorter in the circumferential direction than the sensor support base, if the sensor support base is constituted by using two pieces of the same shape, the sensor case can be attached to each of the split pieces. is there. By attaching a sensor case to each divided piece, if multiple sensor cases are attached to the magnetic sensor unit, use of the remaining sensor cases can be continued even if one of the sensor cases fails. it can.

  The means for connecting the two divided pieces is not particularly limited. For example, the connection can be made by fastening the two divided pieces sandwiching the track-side peripheral surface in the radial direction with a screw member.

  As described above, the present invention adopts the above configuration in the bearing with the rotation sensor having the self-power generation function, so that the coil does not protrude in the opposite direction as compared with the magnetic sensor, and the coil using the periphery of the back magnet. Since it becomes accommodation and a yoke can also be abbreviate | omitted, the accommodation space of an induction electromotive part can be made small.

Partially cutaway side view showing the overall structure of the bearing with a rotation sensor according to the first embodiment Sectional view taken along line II in FIG. 1 is a circuit configuration diagram of the power supply circuit section of FIG. Partially cutaway side view showing the overall configuration of a bearing with a rotation sensor according to a second embodiment Partially cutaway side view showing the overall structure of a bearing with a rotation sensor according to a third embodiment Sectional drawing which showed 3rd Embodiment by the same cutting line as FIG. (A) is a side view in the middle of sandwiching the raceway with the split piece according to the third embodiment, (b) is a side view of a state in which the split piece is connected and attached to the raceway ring. Sectional drawing which showed the position which pinches a bearing ring with the division | segmentation piece of Fig.7 (a) Partially cutaway side view showing the overall structure of a bearing with a rotation sensor according to a fourth embodiment Sectional drawing which showed 4th Embodiment by the same cutting line as FIG.

A bearing with a rotation sensor according to a first embodiment of the present invention will be described with reference to FIGS.
As shown in the drawing, this bearing with a rotation sensor includes a magnetic sensor unit 2 mounted on one of the inner and outer race rings 1 and a pulsar ring 4 that is rotated integrally with the other inner and outer race rings 3.

  One track ring 1 is attached to a fixed member. The other race ring 3 is fixed to a rotating member that rotates in the circumferential direction with respect to the fixed member. Since this bearing with a rotation sensor has one raceway ring 1 as an inner ring, it is used for outer ring rotation. It is also possible to use the outer ring as one of the race rings. Both race rings 1, 3 are for a separate type single row tapered roller bearing. In this invention, “circumferential direction” means a direction around the bearing center axis, “axial direction” means a direction along the bearing center axis, and “radial direction” means the bearing center. A direction perpendicular to the axis. “Rotation sensor” refers to a sensor that can output at least one detection signal of rotation angle, rotation speed, and rotation direction as an electrical signal.

  The pulsar ring 4 is a mounting part made of a magnetic material in which holes 5 and pillars 6 are alternately arranged in the circumferential direction. The pulsar ring 4 is attached to the raceway ring 3 so as to be integrally rotatable by press-fitting to the other raceway ring 3 so that one end thereof is inserted into the circumferential groove of the raceway ring 3.

  A magnetic sensor 7 facing the pulsar ring 4, a back magnet 8 that applies a bias magnetic field from behind the magnetic sensor 7, a coil 9 that generates an induced electromotive force due to a change in the bias magnetic field, and the electromotive force as a power source for the magnetic sensor 7. The power supply circuit unit 10 to be supplied is accommodated in the magnetic sensor unit 2.

  The pulsar ring 4 has a first gap portion that forms the shortest distance from the magnetic sensor 7 like the column portion 6, and a second gap portion that forms a far distance from the close passage portion like the hole 5. As long as they are alternately arranged in the direction and rotate integrally with the other raceway ring 3, both gap portions may alternately pass through the bias magnetic field, thereby causing a change in the bias magnetic field. For example, the pulsar ring 4 may be formed with a recess that is recessed on the outer diameter side of the column portion 6 instead of the hole 5.

  The magnetic sensor unit 2 includes a sensor support base 11 supported by one of the track rings 1 and a sensor case 12 combined with the sensor support base 11 as constituent members. The sensor support base 11 is formed of an annular body that is slidably mounted in the circumferential direction with respect to the track-side peripheral surface of one track ring 1. The sensor case 12 has a cylindrical storage chamber 13 having a closed end wall on the side facing the pulsar ring, and a pair of legs 14 protruding from the storage chamber 13 toward the one raceway ring 1 side. A magnetic sensor 7, a back magnet 8, a coil 9, a power supply circuit unit 10 and the like are accommodated in the storage chamber 13.

  The magnetic sensor 7 includes a circuit that converts a change in the bias magnetic field into an electric signal. The magnetic sensor 7 in the illustrated example is composed of a Hall IC that converts a change in magnetic field into an analog signal using the Hall effect and converts it into an output signal of a digital signal. The analog signal conversion unit of the magnetic sensor 7 is located in the vicinity of the front surface of the sealing unit that wraps the analog signal conversion unit. The pulsar ring 4 faces the front surface of the sealing portion of the magnetic sensor 7 with a radial gap. The opposing direction of the magnetic sensor 7 and the pulsar ring 4 is set to the linear direction of the II line in FIG. 1 (hereinafter simply referred to as the opposing direction).

  The back magnet 8 is composed of a permanent magnet in which the N pole and the S pole are arranged in the opposing direction. As is clear from FIGS. 1 and 2, a single electronic component having a back magnet 8 fixed to the back surface of the sealing portion of the magnetic sensor 7 is mounted on a circuit board. A power supply circuit unit 10 is provided on the circuit board. The terminal part of the magnetic sensor 7 protrudes in the opposite direction from the back magnet 8, and the power supply circuit part 10 is mounted using the space behind the back magnet 8 floating from the circuit board. In the vicinity of the periphery of the back magnet 8, a coil 9 wound in a multiple manner is provided. The coil 9 is disposed around the back magnet 8 with the direction of the coil axis as the opposing direction. Both ends of the coil 9 are connected to the input ends of the power supply circuit unit 10. The magnetic sensor 7, the back magnet 8, the coil 9, and the power supply circuit unit 10 are accommodated in one storage chamber 13, and only the storage chamber 13 is used to set the shortest distance in the opposing direction between the magnetic sensor 7 and the pulsar ring 4. By providing the magnetic sensor unit so as to protrude in the radial direction from the magnetic sensor unit portion, the portion other than the storage chamber 13 is provided in a compact manner in the radial direction.

  The closed end of the storage chamber 13 is formed with a thin portion 15 whose thickness is reduced in the opposing direction, and an inner cylindrical wall 16 protruding so as to surround the thin portion 15. The front surface of the sealing portion of the magnetic sensor 7 is disposed close to the back of the thin portion 15. As a result, the magnetic sensor 7 is arranged by utilizing the depression of the closed end wall accompanying the formation of the thin portion 15, and the shortest distance formed by the magnetic sensor 7 and the pulsar ring 4 is reduced in the facing direction. The back magnet 8 is disposed further inside the inner cylinder wall 16. The inner cylinder wall 16 has an outer peripheral surface protruding in the opposite direction, and supports the inner periphery of the coil 9. The coil 9 is wound around the outer peripheral surface of the inner cylindrical wall 16, and the direction of the coil axis is fixed in the facing direction by the inner cylindrical wall 16. The coil 9 is supported in the opposing direction by the thick portion of the closed end of the storage chamber 13. With this support, the coil 9 is arranged so as to be farther away from the pulsar ring 4 than the magnetic sensor 7 in the facing direction. In addition, when the back magnet 8 floats from the circuit board as shown in the drawing, the coil 9 can be accommodated using not only the periphery of the back magnet 8 but also the space between the back magnet 8 and the circuit board. It is.

  When the pulsar ring 4 rotates together with the other raceway ring 3, a change in the bias magnetic field occurs at the magnetic sensor 7, and an electric signal corresponding to the change is output from the magnetic sensor 7. At the same time, an induced electromotive force based on Faraday's law of electromagnetic induction is generated in the coil 9 due to a change in the bias magnetic field penetrating the inside of the coil 9. There is no yoke for reducing the bias magnetic field.

3A and 3B show the main part of the power supply circuit unit 10. FIG. As shown in the drawing, both ends of the coil 9 are connected to the input end of the power supply circuit unit 10, and the induced electromotive force (alternating current) is input from here. The power supply circuit unit 10 converts the input into direct current by a rectifier circuit, and further generates a direct current power supply (+ V) for the magnetic sensor 7 through a smoothing circuit and a stabilization circuit, and the direct current power supply (+ V) is converted into a magnetic sensor. 7 is supplied to the terminal portion. The power supply circuit unit 10 is not limited to the circuit configuration in the illustrated example, and, for example, a stabilization circuit using a three-terminal regulator can be employed.
A charge / discharge unit for power storage may be added to the power supply circuit unit 10. As the charging / discharging unit, for example, a capacitor or a secondary battery can be employed. Moreover, although the output circuit of the magnetic sensor 7 of FIG.3 (b) illustrated the open collector output, another output circuit may be sufficient.

  The sensor support base 11 is formed with a recess 17 for combining the sensor case 12. A guide wall formed on the recess 17 and the sensor case 12 by inserting the pair of leg portions 14 of the sensor case 12 from the axial direction into the recess 17 of the sensor support base 11 mounted on one of the race rings 1. Sliding contact occurs, and the sensor case 12 is guided to a predetermined combination position with respect to the sensor support base 11. At the time of this insertion, the wire holding groove portion 18 formed in the sensor support base 11 is sandwiched between the pair of leg portions 14, and the electric wire 19 that has come out of the sensor case 12 from between the pair of leg portions 14 becomes the wire holding groove portion 18. It has come in. The electric wire 19 is for connecting the magnetic sensor 7 and an external device using this output signal.

  The magnetic sensor unit 2 includes the auxiliary member 20 that fixes the sensor case 12 combined with a predetermined position of the sensor support base 11 to the sensor support base 11 as described above. This predetermined position is determined so that when the bearing with the rotation sensor is incorporated, the magnetic sensor 7 and the back magnet 8 form a normal distance in the opposite direction to the pulsar ring 4. The auxiliary member 20 that forms the shortest distance is a male screw member that is screwed into the screw hole of the sensor support base 11. The sensor case 12 is screwed to the sensor support base 11 by screwing each leg 14 and the sensor support base 11 with the auxiliary member 20. The releasing operation with respect to the auxiliary member 20 is only a screw extracting operation for turning the male screw member, whereby the sensor case 12 can be separated from the sensor support base 11. Since the sensor case 12 is fixed only by guiding by sliding contact and screwing, the separated sensor case 12 is not rough like the adhesive peeled surface and can be reused as it is.

  Since this bearing with a rotation sensor is a separate type bearing, there is no concern that the pulsar ring 4 or the other race ring 3 will be in the way when the sensor case 12 is attached to or detached from the sensor support base 11 attached to the one race ring 1. . For this reason, the auxiliary member 20 is screwed in the radial direction.

  The sensor case 12 is assembled after the storage chamber 13 is sealed. This sealing is performed by accommodating a circuit board (electronic sensor constituting the magnetic sensor 7, power supply circuit unit 10, etc., both ends of the coil 9, and the electric wire 19 connected by soldering or the like) in the accommodating chamber 13. The operation is performed by sealing the open cylinder port of the chamber 13. This sealing can be performed with a thermosetting resin such as an epoxy resin or a urethane resin, or hot melt. When it is difficult to incorporate a mounted circuit board from the open tube port of the storage chamber 13, the storage chamber 13 may be divided at the side periphery, and the storage chamber 13 may be assembled after the circuit board is installed. The auxiliary member 20 may be any member that is interposed between the sensor case 12 and the sensor support base 11 and can sufficiently resist the separation behavior of the sensor case 12, for example, a spring fixed to the sensor case or the sensor support base. It may consist of a piece, bend at the time of insertion, be hooked to the mating counterpart, and perform a release operation to release the hook by bending the spring piece again with an insertion jig or the like.

  The material for forming the sensor case 12 may be appropriately selected according to the required durability. For example, the sensor case 12 is reinforced with glass fiber, mainly composed of polyphenylene sulfide resin (PPS), and mixed with polyamideimide resin (PAI). Polymer material can be used. It is preferable that the material be capable of ensuring the durability beyond the lifetime guaranteed for the magnetic sensor 7 and the power supply circuit unit 10.

  The raceway side circumferential surface of one raceway ring 1 has a circumferential groove portion 21 extending in the circumferential direction. On the other hand, the sensor support base 11 has a protrusion 22 that enters the circumferential groove 21 and a sliding surface 23 that fits on the track-side circumferential surface. The sensor support base 11 is attached to the raceway ring 1 by hooking the protrusion 22 in the axial direction with respect to the circumferential groove portion 21 and fitting the raceway side circumferential surface and the sliding surface portion 23 in the radial direction. The sensor support base 11 may be a single annular component that press-fits the protrusion 22 to the circumferential groove 21, or may be assembled into an annular body by connecting a plurality of divided pieces obtained by dividing the sensor support base 11 in the circumferential direction. Good.

  If the stationary member (not shown) that is stationary with respect to one of the race rings 1 and the sensor support base 11 are locked in a circumferential direction by an appropriate means to prevent the magnetic sensor unit 2 from rotating, the race ring At the time of creep of 1, the sensor support base 11 does not rotate in the circumferential direction, and only the race 1 rotates, so that the wire 19 can be prevented from being disconnected. Therefore, even if the bearing is replaced by creep, the electric wire 19 attached to the sensor case 12 can be reused.

  As the detent means, for example, a concave portion or a convex portion (not shown) is formed on the side surface of the sensor support base 11 in at least one place, and a locking portion that meshes with the concave portion or the convex portion is formed on the stationary member. It is possible to employ a means for preventing rotation with a pin or a means for forming a pin hole (not shown) communicating with the stationary member and the sensor support base 11 and preventing rotation with a pin inserted into the pin hole. When providing a convex part in the sensor support base 11, you may provide by inserting (press-fit) metal pins, such as a knock pin, a parallel pin, and a roll pin.

  The first embodiment is as described above, and the coil 9 does not protrude in the opposite direction from the magnetic sensor 7 and the coil is accommodated using the periphery of the back magnet 8, so that the coil 9 penetrates without the yoke. A sufficient change in the bias magnetic field occurs, and the induction electromotive unit is only the coil 9 and the back magnet 8, and these can be compactly accommodated in the sensor case 12. Since power supply to the magnetic sensor 7 is not necessary, it is possible to save power in a device incorporating a rotation sensor bearing. Since the sensor case 12 can be separated and reused, resources can be saved. Since the magnetic sensor unit 2 is slidably rotated with respect to the race 1 in preparation for the creep of one of the races 1, the wire 19 can be prevented from being broken by simply adding a detent to the magnetic sensor unit 2. It can be easily realized. Since disconnection of the electric wire 19 can be prevented, the reliability and life of the magnetic sensor unit 2 are improved as compared with the case where the magnetic sensor unit 2 is fixed to the raceway ring 1.

  A second embodiment will be described with reference to FIG. Hereinafter, differences from the first embodiment will be described, and description of the same conceivable configuration will be omitted. In the illustrated second embodiment, instead of wired transmission of the output signal of the magnetic sensor 7, a transmitter 31 that wirelessly transmits the output signal and a power source of the transmitter 31 are within the storage chamber 13 of the sensor case 12. Is housed in.

  A receiver for receiving an output signal transmitted by the transmitter 31 is provided in a control unit provided in a device (equipment, machine, vehicle, etc.) incorporating a bearing with a rotation sensor, in an intermediate part between the control unit and the sensor case 12 or the like. And the output signal can be used to control the device. If the output (+ V) of the power supply circuit unit 10 can be used as the power source of the transmitter 31, this may be used, and if it cannot be shared with the power supply to the magnetic sensor 7, the power source A circuit for converting the output of the circuit unit 10 into a required power source may be additionally mounted on the circuit board. If transmission by the transmitter 31 is possible even after the bearing rotation is stopped, power may be supplied from the power storage circuit to the transmitter 31.

  In the second embodiment, since it is not necessary to connect the electric wire for transmission to the bearing with the rotation sensor, the incorporation into the apparatus is facilitated.

  A third embodiment will be described with reference to FIGS. As shown in FIGS. 5 and 6, the third embodiment is a non-separable bearing. Deep groove ball bearings are used as non-separable bearings. One raceway ring 41 is an inner ring with both shoulders. The magnetic sensor unit 42 attached to one raceway ring 41 and the pulsar ring 44 attached to the other raceway ring 43 include a sensor case 46 and a pulsar ring 44 combined with the sensor support base 45, and the raceways 41, 43. It is provided so that it may oppose when it protrudes in the axial direction rather than the width | variety of a track ring.

  The sensor case 46 includes an alignment portion 47 protruding in the axial direction in an arc shape along the sensor support base 45, a pair of screwing portions 48 protruding in the circumferential direction along the side surface of the sensor support base 45, and A groove portion 49 for stabilizing the position of the electric wire 19 is provided. The sensor case 46 is combined with the sensor support base 45 from the axial direction. The combination position is determined by the surface contact between the alignment portion 47 and the radial surface of the sensor support base 45, and the axial position is determined by the surface contact between the screwing portion 48 and the sensor support base 45. ing. The screwing portion 48 is screwed to the side surface of the sensor support base 45. The auxiliary member 50 can be screwed in from the axial direction. Therefore, in the third embodiment, even if the races 41 and 43 cannot be separated, the release operation of the auxiliary member 50 can be performed from the axial direction, and the sensor case 46 can be separated from the sensor support base 45 in the axial direction.

  As shown in FIGS. 7 and 8, the sensor support base 45 is configured to be assembled into an annular body by connecting two divided pieces 51, 51 sandwiching the raceway side circumferential surface of the raceway ring 41 in the radial direction. . The two divided pieces 51 and 51 are formed of molded parts having the same shape. The split piece 51 has a protrusion 55 that enters the circumferential groove portion 54 of the race ring 41 and a screw hole 56 for screwing the sensor case 46.

  When the track-side peripheral surface is sandwiched in the radial direction so that the protruding portion 55 enters the circumferential groove portion 54 between the two divided pieces 51, 51, the circumferential one end 52 of the one divided piece 51 and the other divided piece A series of screw hole portions are formed with the other circumferential end portion 53 of 51. The screw member 57 is screwed into the screw hole and the two divided pieces 51 and 51 are fastened to complete the connection, and the ring body is assembled. Simultaneously with this assembly, the sensor support base 45 is attached to the race ring 41. In addition, although the sensor support base body 45 in the illustrated example is adapted to fit in the radial direction with the track-side peripheral surface only on one side of the protrusion 55, the present invention is not limited to this. In the third embodiment, since the protrusion 55 is inserted into the circumferential groove portion 54 from the radial direction without press-fitting, the sensor support base 45 can be easily mounted. In addition, instead of screwing the split pieces 51, 51 with each other, a split piece having a locking claw formed at one circumferential end and a claw receiver formed at the other circumferential end, It is also possible to employ a connecting means in which the engaging claw and the claw receiver are engaged with each other by elastic deformation of the engaging claw of each divided piece that occurs while sandwiching the track side peripheral surface in the radial direction.

  Since the split pieces 51 and 51 have the same shape, they can be mass-produced with a single mold. As a material for forming the sensor support base 45, for example, PPS reinforced with glass fiber, aluminum alloy, cast iron, or the like can be used. When an aluminum alloy is employed, the mold material can be formed by bending with a mold or a jig, or formed by die casting. Whatever material is used, the fitting surface in the radial direction between the sensor support base 45 and the raceway ring 41 is a sliding portion, so it is preferable to actively reduce the friction coefficient. In the case of metal, it is possible to reduce the friction coefficient by appropriately performing a surface treatment on the metal surface that becomes the sliding portion.

  All screw holes 56, 56 for fixing the sensor case 46 are formed in the divided piece 51, and the combination position of the sensor case 46 is separated from both ends in the circumferential direction, so the sensor case 46 is attached to each divided piece 51. can do. If two sensor cases 46 are attached, the remaining sensor cases 46 can continue to be used even if the magnetic sensor or the like of one of the sensor cases 46 breaks down. A spring washer or wave washer can be used as appropriate for fastening the screws between the split pieces 51 and screwing the sensor case 46 to prevent loosening.

  A fourth embodiment will be described with reference to FIGS. The fourth embodiment differs from the third embodiment only in the mounting structure of the magnetic sensor unit 62 with respect to one of the race rings 61, and the pulsar ring 64 and the magnetic sensor unit 62 mounted on the other race ring 63 are different. The positional relationship is the same. The magnetic sensor unit 62 includes an endless annular sensor support base 65 as a component. Since the sensor support base 65 is made of an endless annular part having an L-shaped cross section, it can be easily molded. Before the sensor case 66 is screwed, the cylindrical portion 67 protruding in the axial direction having an L-shaped cross section can be attached to the race ring 61 simply by press-fitting to the race side peripheral surface of the race ring 61.

  The technical scope of the present invention is not limited to the above-described embodiments, but includes all modifications within the scope of the technical idea based on the description of the scope of claims.

DESCRIPTION OF SYMBOLS 1, 41, 61 One track ring 2, 42, 62 Magnetic sensor unit 3, 43, 63 The other track ring 4, 44, 64 Pulsar ring 5 Hole 6 Pillar part 7 Magnetic sensor 8 Back magnet 9 Coil 10 Power supply circuit part 11 , 45, 65 Sensor support base 12, 46, 66 Sensor case 13 Storage chamber 14 Leg 15 Thin wall 16 Inner cylinder wall 17 Recess 18 Wire holding groove 19 Electric wire 20, 50 Auxiliary member 21, 54 Circumferential groove 22, 55 Projection 23 Sliding surface portion 31 Transmitter 47 Positioning portion 48 Screwing portion 49 Groove portion 51 Dividing piece 52 One end portion in the circumferential direction 53 The other end portion in the circumferential direction 56 Screw hole 57 Screw member 67 Cylindrical portion

Claims (12)

A magnetic sensor unit (2) mounted on one of the inner and outer race rings (1), and a pulsar ring (4) rotated integrally with the other inner and outer race rings (3),
As the constituent members of the magnetic sensor unit (2), a magnetic sensor (7) facing the pulsar ring (4), a back magnet (8) for applying a bias magnetic field from behind the magnetic sensor (7), and the bias magnetic field A sensor case (12) in which a coil (9) that generates an induced electromotive force due to a change in voltage and a power supply circuit unit (10) that generates a DC power from the induced electromotive force and supplies the DC power to the magnetic sensor (7) are accommodated In a bearing with a rotation sensor including
The coil (9) surrounds the back magnet (8) with the direction of the coil axis as the opposing direction of the magnetic sensor (7) and the pulsar ring (4), and more than the magnetic sensor (7). A bearing with a rotation sensor, which is disposed so as to be far from the pulsar ring (4) in the facing direction. As constituent members of the magnetic sensor unit (2), a sensor support base (11) supported by the one raceway ring (1), the sensor case (12) combined with the sensor support base (11), An auxiliary member (20) for fixing the sensor case (12) combined with the sensor support base (11) to the sensor support base (11),
The bearing with a rotation sensor according to claim 1, wherein the sensor case (12) can be separated from the sensor support base (11) by a release operation with respect to the auxiliary member (20).   The bearing with a rotation sensor according to claim 2, wherein the auxiliary member (20) is a male screw member.   The bearing with a rotation sensor according to claim 3, wherein the sensor case (12) is combined with the sensor support base (11) from the axial direction and screwed to a side surface of the sensor support base (11) from the axial direction. The sensor case (12) has a cylindrical storage chamber (13) having a closed end wall on the side facing the pulsar ring (4);
The magnetic sensor (7), the back magnet (8), the coil (9), and the power supply circuit section (10) are accommodated in the storage chamber (13),
The closed end wall is formed with a thin portion (15) having a reduced thickness in the opposite direction and an inner cylindrical wall (16) protruding so as to surround the thin portion (15),
The magnetic sensor (7) is disposed by utilizing the depression of the closed end wall accompanying the formation of the thin wall portion (15), and the back magnet (8) is disposed further inside the inner cylindrical wall (16). The bearing with a rotation sensor according to any one of claims 1 to 4, wherein the inner cylindrical wall (16) supports an inner periphery of the coil (9).   6. The electronic device according to claim 1, wherein a single electronic component having the back magnet (8) fixed to the back surface of the sealing portion of the magnetic sensor (7) is accommodated in the sensor case (12). The bearing with a rotation sensor as described.   The transmitter (31) for wirelessly transmitting the output signal of the magnetic sensor (7) and the power source of the transmitter (31) are accommodated in the sensor case (12). The bearing with a rotation sensor according to the item. An electric wire (19) for connecting the magnetic sensor (7) and an external device;
The bearing with a rotation sensor according to any one of claims 1 to 6, wherein the sensor support base (11) is formed of an annular body that is slidably mounted in a circumferential direction with respect to the track-side peripheral surface. The sensor support base (45) is configured to connect two divided pieces (51, 51) sandwiching the track-side peripheral surface in the radial direction and assemble it into an annular body,
The track-side circumferential surface has a circumferential groove portion (54) extending in the circumferential direction,
The divided piece (51) has a protrusion (55) that enters the circumferential groove (54),
When the sensor support base (45) is hooked in the axial direction with respect to the circumferential groove (54) of the protrusion (55) and fitted in the radial direction with the circumferential surface of the raceway, the one bearing ring (41 The bearing with a rotation sensor according to claim 8, which is attached to the bearing.   The bearing with a rotation sensor according to claim 9, wherein the two divided pieces (51, 51) are formed of molded parts having the same shape.   The bearing with a rotation sensor according to claim 10, wherein the sensor case (46) can be mounted for each of the divided pieces (51).   12. The connection according to claim 9, wherein the connection is made by fastening the two divided pieces (51, 51) sandwiching the track-side peripheral surface in the radial direction with a screw member (57). Bearing with rotation sensor.

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