JP2006226951A - Rolling bearing unit with sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing unit with a sensor, capable of generating a large electric power, and capable of dispensing with supply of an electric power, from the outside to a rotation speed sensor. <P>SOLUTION: The first pulser ring 30 of a rotation speed detector 7 is fit fixedly around the outer face of the second cylinder part 22 of a yoke 6, and a magnetic sensor 31 of the rotation speed detector 7 is fixed to a sensor-holding member 5 so as to face a sensor face thereof to the first pulser ring 30 along the radial direction thereof. The second pulser ring 32 of a power generator 8 is fit fixedly internally to the inner face of the second cylinder part 22 of the yoke 6, and a power generating coil 33 is fixed to the sensor-holding member 5 so as to face the axial direction to the second pulser ring 32. SN pitch of the second pulser ring 32 is set larger than the SN pitch of the first pulser ring 30. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a rolling bearing device with a sensor.

  Conventionally, as a rolling bearing device with a sensor, there is one described in JP-A-7-311212 (Patent Document 1).

  This sensor-equipped rolling bearing device includes a ball bearing portion and a sensor portion.

  The ball bearing portion includes an outer ring, an inner ring, a ball, a phonic wheel, a phonic wheel mounting member, and a seal member.

  A plurality of balls are arranged between the inner raceway surface of the outer ring and the outer raceway surface of the inner ring, with a certain distance in the circumferential direction, held by a cage.

  The phonic wheel mounting member includes a cylindrical portion having an inner diameter substantially equal to the outer diameter of the outer peripheral surface of the inner ring, and a flange portion extending perpendicularly to the cylindrical portion from the end surface of the cylindrical portion. The phonic wheel mounting member is fixed to one end portion in the axial direction of the inner ring by fitting the cylindrical portion to the inner ring, and the flange portion opens the inner ring and the outer ring at the one end portion. It spreads in the radial direction so as to close the part.

  The phonic wheel is constituted by a pulsar ring or the like in which N-type magnets and S-type magnets are alternately arranged. The said phonic wheel is being fixed to the outer end surface of the axial direction of the said flange part of the said phonic wheel mounting member.

  The seal member seals the opening on the side where the axial phonic wheel of the outer ring and the inner ring is not disposed. The sealing member prevents foreign matters such as water, dust and mud from entering the bearing portion.

  The sensor part includes a fixing ring, a resin mold part, and a sensor.

  The fixing ring includes a fitting portion adapted to an inner peripheral surface and an end surface of the outer ring on the phonic wheel arrangement side, and a cylindrical portion extending outward in the axial direction from a radially outer end portion of the fitting portion. The fitting portion is fixed to the outer ring by fitting the fitting portion into the outer ring.

  The resin mold part has a role of holding the sensor and is formed inward in the radial direction of the fixing ring.

  Further, the sensor is arranged at one place in the circumferential direction of the mold part that can face the phonic wheel. In the sensor, a surface facing the phonic wheel is exposed from the resin mold portion. The sensor is supplied with electric power from an external power source.

  The sensor-equipped rolling bearing device detects the rotational speed of the bearing portion by detecting periodic magnetic direction information and the like (when the phonic wheel is pulsar ring) possessed by the phonic wheel with the sensor. Yes.

However, in the conventional rolling bearing device with a sensor, electric power must be supplied to the sensor from the outside, and there is a problem that the operation cost of the rolling bearing device with a sensor is high. In particular, there are a plurality of rolling bearing devices with a sensor. In the case of having such a power-driven device, there is a problem that the operation cost is very high because a large amount of electric power must be supplied from the outside to the rolling bearing device with sensor. Furthermore, when power is supplied from a battery or the like, information from the sensor may not be output due to the battery running out.
Japanese Patent Laid-Open No. 7-311212

  Therefore, an object of the present invention is to provide a sensor-equipped rolling bearing device that can generate large electric power and does not need to supply electric power to the rotational speed sensor from the outside.

In order to solve the above problems, a rolling bearing device with a sensor according to the present invention comprises:
An outer ring having a raceway surface on the inner periphery;
An inner ring having a raceway surface on the outer periphery;
A rolling element disposed between the raceway surface of the outer ring and the raceway surface of the inner ring;
A first pulsar ring provided on one of the outer ring or the inner ring, and a rotational speed sensor provided on the other of the outer ring or the inner ring so as to face the first pulsar ring in the axial direction or the radial direction. A rotational speed detection device for detecting a relative rotational speed of the inner ring with respect to the outer ring;
The outer ring or the inner ring is provided on one of the outer ring or the inner ring and is opposed to the second pulsar ring, which is a separate member from the first pulsar ring, and the second pulsar ring in the axial direction or the radial direction. A power generating coil provided on the other side of the power generator and generating power using relative rotation of the inner ring with respect to the outer ring,
The rotational speed sensor is driven by electric power generated by the power generator.

  The term “provided on one of the outer ring or the inner ring” means that the member is stationary with respect to one of the outer ring or the inner ring (for example, a yoke or a sensor holding member fixed to one of the outer ring or the inner ring). The term “provided on the other of the outer ring or the inner ring” includes a member that is stationary with respect to the other of the outer ring or the inner ring (for example, the outer ring or the inner ring). And a case of being provided on a yoke or a sensor holding member fixed to the other of the above.

  According to the present invention, a power generation device that generates electric power using the relative rotation of the inner ring with respect to the outer ring is provided, and the rotational speed sensor is driven by the electric power generated by the power generation device. Unlike the additional rolling bearing device, it is not necessary to supply power for driving the rotational speed sensor from an external power source. Therefore, the operating cost of the sensor-equipped rolling bearing device can be greatly reduced.

  Further, according to the present invention, since the second pulsar ring is a separate member from the first pulsar ring, the SN pitch of the second pulsar ring of the power generator is independent of the SN pitch of the first pulsar ring. Can be set freely. Therefore, desired power can be easily generated by appropriately adjusting the SN pitch of the second pulsar ring, and in particular, large power can be generated by increasing the SN pitch of the second pulsar ring. it can.

  In the rolling bearing device with a sensor according to one embodiment, the SN pitch of the first pulsar ring is smaller than the SN pitch of the second pulsar ring.

  In this specification, the SN pitch of the pulsar ring is set to the center of the S pole on the outer peripheral surface of the pulsar ring in which the S pole and the N pole are alternately formed in the circumferential required angle region, and next to the S pole. It is defined by the distance from the center of the N pole.

  According to the embodiment, since the SN pitch of the first pulsar ring is smaller than the SN pitch of the second pulsar ring, the relative pitch is determined based on the magnetic information of the first pulsar ring having a small SN pitch. The rotation speed can be accurately measured, and large electric power can be generated based on the second pulsar ring having a large SN pitch.

Moreover, the rolling bearing device with a sensor of one embodiment is
An annular portion fitted in one end portion of the outer ring in the axial direction, and a first disc extending substantially inward in the radial direction from the axially outer end portion of the annular portion. A sensor holding member having a portion and a resin mold portion disposed in a region radially inward of the annular portion and inward of the axial direction of the first disc portion,
A first cylindrical portion fitted on one end portion in the axial direction of the inner ring, and a second circle extending outward in a substantially radial direction from an axially outer end portion of the first cylindrical portion. A yoke having a plate portion and a second cylindrical portion extending outward in a substantially axial direction from a radially outer end portion of the second disk portion; and a yoke made of a magnetic material. ,
The first pulsar ring is externally fitted and fixed to the outer peripheral surface of the second cylindrical portion of the yoke, and the rotational speed sensor is arranged such that the sensor surface faces the first pulsar ring in the radial direction. , Is fixed to the resin mold part,
The second pulsar ring is fitted and fixed to the inner peripheral surface of the second cylindrical portion of the yoke, and the power generating coil is axially opposed to the second pulsar ring. It is fixed to the mold part.

  According to the embodiment, the yoke made of a magnetic material can prevent the magnetic field of the second pulsar ring for power generation from leaking to the rotational speed sensor side. Therefore, the magnetic field of the second pulsar ring for power generation can be reliably prevented from interfering with the magnetic field of the first pulsar ring for speed detection, and the relative rotational speed of the inner ring with respect to the outer ring can be accurately detected.

  In the above embodiment, since both the rotation speed sensor and the power generation coil are disposed in the resin mold portion, the rotation speed sensor and the power generation coil do not move relative to each other, and the power generation The electric power generated by the coil for use can be easily supplied to the rotation speed sensor.

  According to the rolling bearing device with a sensor of the present invention, the rotational speed sensor is driven by the electric power generated by the power generation device that generates electric power using the relative rotation of the inner ring with respect to the outer ring. It is not necessary to supply power from an external power source, and the operating cost of the rolling bearing device with sensor can be greatly reduced.

  Further, according to the present invention, since the second pulsar ring is a separate member from the first pulsar ring, the SN pitch of the second pulsar ring can be freely set regardless of the SN pitch of the first pulsar ring. Thus, desired power can be easily taken out by appropriately adjusting the SN pitch of the second pulsar ring.

  Hereinafter, the present invention will be described in detail with reference to the drawings.

(First embodiment)
FIG. 1 is a sectional view in the axial direction of a rolling bearing device with a sensor according to a first embodiment of the present invention.

  This sensor-equipped rolling bearing device includes an outer ring 1, an inner ring 2, a ball 3 as an example of a rolling element, a sensor holding member 5, a yoke 6 made of a magnetic material, a rotation speed detection device 7, and a power generation device. 8.

  The outer ring 1 is a fixed ring, and is fixed to a housing or the like (not shown) of a machine provided with the sensor-equipped rolling bearing device. The outer ring 1 has a raceway groove 11 as a raceway surface at a substantially center in the axial direction of the inner circumference, and a sensor holding member mounting groove 12 at one end portion in the axial direction of the inner circumference. Moreover, the said inner ring | wheel 2 is a rolling wheel, and is being fixed to the outer peripheral surface of the rotating shaft which is not shown in figure. The inner ring 2 has a raceway groove 13 as a raceway surface at a location facing the raceway groove 11 of the outer ring 1 on the outer periphery. Further, a plurality of balls 3 are arranged between the raceway groove 11 of the outer ring 1 and the raceway groove 13 of the inner ring 2 with a certain interval in the circumferential direction while being held by a cage (not shown). Yes.

  The sensor holding member 5 includes an annular portion 15, a first disc portion 16, and a resin mold portion 17. The shape of one end portion in the axial direction of the annular portion 15 is a shape adapted to the inner peripheral surface and the end surface of one end portion in the axial direction of the outer ring 1. A part of the outer peripheral surface of the annular portion 15 is fitted into the inner peripheral surface of one end portion in the axial direction of the outer ring 1, and one end portion in the axial direction of the annular portion 15 is one end in the axial direction of the outer ring 1. The tip of the annular portion 15 in the axial direction is fitted into the sensor holding member mounting groove 12 so that the annular portion 15 is firmly fixed to the outer ring 1 while being fitted to the inner peripheral surface and end face of the portion. is doing. The sensor holding member 5 is stationary with respect to the outer ring 1. Moreover, the part on the opposite side to the outer ring | wheel fixed side in the said annular | circular shaped part 15 is a cylinder shape, and is extended in the axial direction.

  The first disk portion 16 is a member having a substantially U-shaped cross section. The first disc portion 16 is fixed to the annular portion 15 with the recess facing the outer ring 1 and the inner ring 2. Specifically, the first disc portion 16 is fixed to the annular portion 15 by fixing the outer peripheral surface corresponding to one side surface of the recess to the inner surface of the end portion on the axially outer side of the annular portion 15. ing. The resin mold portion 17 is a member having a substantially seven-shaped cross section, and is disposed in a region radially inward of the annular portion 15 and inward in the axial direction of the first disc portion 16. ing.

  The yoke 6 includes a first cylindrical portion 20, a second disc portion 21 that is continuous with the first cylindrical portion 20, and a second cylindrical portion 22 that is continuous with the second disc portion 21. The inner peripheral surface of the first cylindrical portion 20 is fitted and fixed to one end portion in the axial direction of the inner ring 2. The yoke 6 is stationary with respect to the inner ring 2. The second disk portion 21 extends radially outward from the axially outer end of the first cylindrical portion 20. The second cylindrical portion 22 extends outward in the axial direction from the radially outer end of the second disc portion 21 to the front of the resin mold portion 17.

  The rotational speed detection device 7 includes a first pulsar ring 30 and a magnetic sensor 31 as an example of the rotational speed sensor. The first pulsar ring 30 is adhered and externally fixed to the outer peripheral surface of the second cylindrical portion 22. The first pulsar ring 30 is made of a plastic magnet ring provided with magnetic poles having different polarities alternately in the circumferential direction. This plastic magnet ring is magnetized to S pole and N pole alternately in the circumferential required angle region using a synthetic metal injection molded product mixed with magnetic powder or a magnetic metal material such as sintered ferrite as a base material. Is formed.

  Further, the magnetic sensor 31 is adhesively fixed to the resin mold portion 17 so that the sensor surface thereof is disposed to face the outer peripheral surface of the first pulsar ring 30 in the radial direction. The magnetic sensor 31 is composed of a Hall IC. This Hall IC has a structure in which an IC chip is molded with a protective cover made of a synthetic resin.

  When the first pulsar ring 30 rotates synchronously with the inner ring 2 as the inner ring 2 rotates, the magnetic poles of the first pulsar ring 30 sequentially face the non-rotating magnetic sensor 31. Here, the magnitude of the magnetic field (line of magnetic force) generated between the plurality of pairs of magnetic poles of the first pulsar ring 30 increases and decreases periodically in the circumferential direction, and the direction of the magnetic field (line of magnetic force) alternates in the circumferential direction. Since the directions are opposite, the direction of the magnetic field passing through the magnetic sensor 31 with the rotation of the first pulsar ring 30 is sequentially rotated at a period corresponding to the rotation speed. The magnetic sensor 31 detects periodic reversal of the direction of the magnetic field, and sends a pulse signal having a frequency corresponding to the rotation speed of the first pulsar ring 30 to a rotation speed calculation device (not shown) via a wire. Alternatively, it is output wirelessly.

  The power generation device 8 includes a second pulsar ring 32 and a power generation coil 33. The second pulsar ring 32 is a separate member from the first pulsar ring 30. The second pulsar ring 32 is adhesively fixed to the outer end surface in the axial direction of the second disc portion 21 of the yoke 6, and the second cylindrical portion 22. Adhesion and internal fitting are fixed to the inner peripheral surface of the.

  The second pulsar ring 32 is composed of a plastic magnet ring provided with magnetic poles having different polarities alternately in the circumferential direction. This plastic magnet ring is magnetized to S pole and N pole alternately in the circumferential required angle region using a synthetic metal injection molded product mixed with magnetic powder or a magnetic metal material such as sintered ferrite as a base material. Is formed. The power generating coil 33 is adhesively fixed to the surface of the resin mold portion 17 so as to be opposed to the second pulsar ring 32 in the axial direction.

  When the second pulsar ring 32 rotates synchronously with the inner ring 2 as the inner ring 2 rotates, each magnetic pole of the second pulsar ring 32 has a surface portion of the resin mold portion 17 to which the non-rotating power generation coil 33 is fixed. Will face each other sequentially. Here, the magnitude of the magnetic field (lines of magnetic force) generated between the plurality of pairs of magnetic poles of the second pulsar ring 32 increases and decreases periodically in the circumferential direction, and the direction of the magnetic field (lines of magnetic force) alternates in the circumferential direction. Since the direction is reversed, the magnitude of the magnetic field passing through the portion surrounded by the electric wire of the power generation coil 33 varies with time, and current is generated in the power generation coil 33 by the law of electromagnetic induction. It has become. The power generating coil 33 is electrically connected to the secondary battery via a rectifier circuit. The magnetic sensor 31 is electrically connected to the secondary battery and is driven by electric power charged in the secondary battery.

  FIG. 2 is an enlarged perspective view of the vicinity of the second cylindrical portion 22 of the yoke 6.

  As shown in FIG. 2, the SN pitch of the first pulsar ring 30 disposed on the outer peripheral surface of the second cylindrical portion 22 is equal to that of the second pulsar ring 32 disposed on the inner peripheral surface of the second cylindrical portion 22. It is smaller than the SN pitch.

  As shown in FIG. 2, the yoke 6 made of a magnetic material is located between the first pulsar ring 30 and the second pulsar ring 32, and this yoke 6 is generated by the first pulsar ring 30. The magnetic field generated by the first pulsar ring 30 is prevented from affecting the magnetic field generated by the second pulsar ring 32, and the magnetic field generated by the second pulsar ring 32 is blocked, The magnetic field generated by the second pulsar ring 32 is prevented from affecting the magnetic field generated by the first pulsar ring 30.

  FIG. 3 is a diagram showing a detailed structure of the power generation coil 33 that is adhesively fixed to the surface portion of the resin mold portion 17, and the positional relationship between the second pulsar ring 32 and the power generation coil 33 at a certain moment. FIG.

  In FIG. 3, an arrow 37 indicates the magnitude and direction of the magnetic field generated by the first pulsar ring 30 (the length of the arrow corresponds to the magnitude), and an arrow 38 indicates the second pulsar ring 32. Shows the magnitude and direction of the magnetic field generated by.

  As shown in FIG. 3, the magnetic field generated by the first pulsar ring 30 is blocked by the yoke 6 and does not interfere with the magnetic field generated by the second pulsar ring 32. The power generating coil 33 has two windings, and each winding is a surface portion of the resin mold portion 17 (see FIG. 1) at a certain moment during operation of the sensor-equipped rolling bearing device. The second pulsar ring 32 of the power generation device 8 is adhesively fixed to a portion that can be opposed substantially to the periphery (periphery) 39 of one magnetic pole in the axial direction. As shown in FIG. 3, the AC power generated by the power generating coil 33 is converted into DC power by a rectifier circuit, and then charged to the secondary battery. The electric power stored in the secondary battery is used as driving power for the magnetic sensor 31 when the magnetic sensor 31 is used.

  In FIG. 3, during operation of the apparatus, the second pulsar ring 32 has one of the circumferential directions indicated by the arrow α in FIG. By rotating in the (clockwise) direction, the direction and direction of the magnetic field penetrating the power generation coil is changed to generate electric power.

  According to the rolling bearing device with a sensor of the first embodiment, the power generation device 8 that generates electric power using the relative rotation of the inner ring 2 with respect to the outer ring 1 is provided, and the magnetic sensor 31 as an example of the rotational speed sensor is a power generation device. 8 is driven by the generated electric power, unlike the conventional rolling bearing device with a sensor, it is not necessary to supply electric power for driving the rotational speed sensor from an external power source. Therefore, the operating cost of the sensor-equipped rolling bearing device can be greatly reduced.

  Moreover, according to the rolling bearing device with a sensor of the said 1st Embodiment, since the said 2nd pulsar ring 32 is a different member from the 1st pulsar ring 30, the SN pitch of the 2nd pulsar ring 32 is made into the 1st pulsar ring 30. It can be set freely regardless of the SN pitch. Therefore, desired power can be easily taken out by appropriately adjusting the SN pitch of the second pulsar ring 32.

  Moreover, according to the rolling bearing device with a sensor of the first embodiment, the SN pitch of the first pulsar ring 30 is smaller than the SN pitch of the second pulsar ring 32, so the first SN pitch is small. The relative rotational speed can be accurately measured based on the magnetic information of the pulsar ring 30, and a large electric power can be generated based on the second pulsar ring 32 having a large SN pitch.

  Moreover, according to the rolling bearing device with a sensor of the said 1st Embodiment, it can prevent that the magnetic field of the 2nd pulsar ring 32 leaks to the rotational speed detection apparatus 7 side with the yoke 6 which consists of a magnetic material. Accordingly, the rotational speed detection device 7 can accurately detect the relative rotational speed of the inner ring 2 with respect to the outer ring 1.

  Further, according to the rolling bearing device with a sensor of the first embodiment, since the magnetic sensor 31 and the power generation coil 33 are both disposed in the resin mold portion 17, the magnetic sensor 31 and the power generation coil 33 are relative to each other. The electric power generated by the power generating coil 33 can be easily supplied to the magnetic sensor 31 without moving.

  In the rolling bearing device with a sensor according to the first embodiment, the magnetic sensor 31 and the power generation unit fixed to the sensor holding member 5 fixed to the outer ring 1 which is a fixed ring (stationary with respect to the outer ring 1). The first pulsar ring 30 and the second pulsar ring 32 fixed to the yoke 6 fixed to the inner ring 2 that is a rolling wheel (stationary with respect to the inner ring 2) rotate relative to the coil 33. In this invention, the outer ring may be a rolling wheel and the inner ring may be a fixed ring. Further, the rotation speed fixed to the rolling wheel (or member stationary to the rolling wheel) with respect to the first pulsar ring fixed to the fixed wheel (or member stationary to the fixed wheel). The sensor may rotate relative to the second pulsar ring fixed to the fixed wheel (or a member stationary with respect to the fixed wheel). The power generating coil fixed to may rotate relative to the power generation coil.

  In the rolling bearing device with a sensor according to the first embodiment, the magnetic sensor 31 and the power generation coil 33 are disposed in the resin mold portion 17 that is a place stationary with respect to the outer ring 1 that is a fixed ring. The first pulsar ring 30 and the second pulsar ring 32 are disposed on the yoke 6 that is stationary with respect to the inner ring 2 that is a rolling wheel. In the present invention, the rotational speed sensor, the power generating coil, At least one of the first pulsar ring and the second pulsar ring may be disposed directly on the inner ring or the outer ring.

  In the rolling bearing device with a sensor according to the first embodiment, the first pulsar ring 30 and the magnetic sensor 31 are arranged to face each other in the radial direction of the rolling bearing device with a sensor. The rotation speed sensor may be disposed so as to face the axial direction of the sensor-equipped rolling bearing device.

  In the rolling bearing device with a sensor of the first embodiment, the second pulsar ring 32 and the power generation coil 33 are arranged to face each other in the axial direction of the rolling bearing device with a sensor. And the power generating coil may be arranged to face each other in the radial direction of the rolling bearing device with the sensor.

  Further, in the rolling bearing device with a sensor according to the first embodiment, the rotational speed detection device 7 is disposed radially outward of the yoke 6 and the power generation device 8 is disposed radially inward of the yoke 6. In this invention, the arrangement position of the rotation speed detection device and the arrangement position of the power generation device are completely replaced, and the power generation device is arranged radially outward of the yoke, and the rotation speed detection device is arranged radially inward of the yoke. May be arranged.

  Moreover, in the rolling bearing device with a sensor of the first embodiment, the power generation coil 33 has two windings. However, in this invention, the power generation coil has one winding, or three or more windings. (The power generating coil can supply power proportional to the number of turns).

  Moreover, in the rolling bearing device with a sensor of the said 1st Embodiment, although the rolling element was the ball 3, in this invention, a rolling element may be a cylindrical roller and a tapered roller may be sufficient.

  In addition, it is not necessary to use the electric power stored in the secondary battery only as the driving power for the rotational speed sensor, and the electric power stored in the secondary battery can be used as a device other than the driving power for the rotational speed sensor and the rotational speed sensor ( For example, when a temperature sensor is installed, it may be used as drive power for the temperature sensor) or may be used as power for the wireless mechanism.

(Second Embodiment)
FIG. 4 is a diagram showing a positional relationship between the second pulsar ring 32 and the power generating coil 43 provided in the sensor-equipped rolling bearing device of the second embodiment.

  The rolling bearing device with sensor of the second embodiment is different from the rolling bearing device with sensor of the first embodiment only in the shape of the power generating coil 43.

  In the rolling bearing device with a sensor according to the second embodiment, the same reference numerals are assigned to the same components as those of the rolling bearing device with a sensor according to the first embodiment, and the description thereof will be omitted. Moreover, in the rolling bearing device with a sensor of 2nd Embodiment, description is abbreviate | omitted about the structure, effect, and modification which are common in the rolling bearing device with a sensor of 1st Embodiment, and with a sensor of 1st Embodiment. Only configurations and modifications different from the rolling bearing device will be described.

  In the rolling bearing device with sensor of the second embodiment, the power generating coil 43 is arranged around the N pole (or S pole) of the second pulsar ring 32 of the power generating device 8 at a certain moment during operation of the rolling bearing device with sensor. (Peripheral) 39 is adhesively fixed to the surface portion of the resin mold portion 17 (see FIG. 1) that can face the substantially axial direction over the entire circumference. Further, at a certain moment, a two-turn wiring is fixed to a portion facing the periphery (periphery) of each magnetic pole.

  In the rolling bearing device with a sensor according to the second embodiment, at a certain moment, a two-turn wiring is fixed to a part facing the periphery (periphery) of each magnetic pole. One or three or more turns of wiring may be fixed to a portion facing the periphery (periphery) of the magnetic pole.

(Third embodiment)
FIG. 5 is a diagram illustrating a positional relationship between the second pulsar ring 32 and the power generation coil 53 provided in the sensor-equipped rolling bearing device according to the third embodiment.

  The rolling bearing device with sensor of the third embodiment is different from the rolling bearing device with sensor of the first embodiment only in the shape of the power generating coil 53.

  In the rolling bearing device with a sensor according to the third embodiment, the same components as those of the rolling bearing device with a sensor according to the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. Moreover, in the rolling bearing device with a sensor of 3rd Embodiment, description is abbreviate | omitted about the structure, effect, and modification which are common in the rolling bearing device with a sensor of 1st Embodiment, and with a sensor of 1st Embodiment. Only the configuration different from the rolling bearing device will be described.

  In the rolling bearing device with a sensor according to the third embodiment, the power generating coil 53 has a surrounding (periphery) 39 around each magnetic pole of the second pulsar ring 32 of the power generating device 8 at a certain moment during the operation of the rolling bearing device with a sensor. The resin mold portion 17 (see FIG. 1) that can face the substantially axial direction is adhesively fixed over the entire circumference in the circumferential direction. Further, as shown in FIG. 5, at a certain moment, the winding method of the portion facing the adjacent magnetic pole has an opposite relationship (otherwise, it faces the S pole of the power generation coil 53 at a certain moment). The power generated at the portion that cancels out and the power generated at the portion facing the north pole of the power generating coil 53 cancel each other).

(Fourth embodiment)
FIG. 6 is a diagram illustrating a positional relationship between the second pulsar ring 32 and the power generation coil 63 included in the sensor-equipped rolling bearing device according to the fourth embodiment.

  The rolling bearing device with sensor of the fourth embodiment is different from the rolling bearing device with sensor of the first embodiment only in the shape of the power generating coil 63.

  In the rolling bearing device with a sensor according to the fourth embodiment, the same reference numerals are given to the same components as those of the rolling bearing device with a sensor according to the first embodiment, and the description thereof will be omitted. Moreover, in the rolling bearing device with a sensor of 4th Embodiment, it abbreviate | omits description about a structure, an effect, and a modification which are common in the rolling bearing device with a sensor of 1st Embodiment, and with a sensor of 1st Embodiment. Only the configuration different from the rolling bearing device will be described.

  In the rolling bearing device with a sensor according to the fourth embodiment, the power generating coil 63 has an S-shape around the magnetic pole 39 of the second pulsar ring 32 of the power generating device 8 at a certain moment during operation of the rolling bearing device with the sensor. It is adhesively fixed to the surface portion of the resin mold portion 17 (see FIG. 1) that can face the portion meandering in a substantially axial direction over the entire circumference.

It is sectional drawing of the axial direction of the rolling bearing apparatus with a sensor of 1st Embodiment of this invention. It is an expansion perspective view of the 2nd cylindrical part vicinity of the yoke with which the rolling bearing apparatus with a sensor of the said 1st Embodiment is provided. It is a figure which shows the detailed structure of the coil for electric power generation with which the rolling bearing apparatus with a sensor of the said 1st Embodiment is provided. It is a figure which shows the detailed structure of the coil for electric power generation with which the rolling bearing apparatus with a sensor of the said 2nd Embodiment is provided. It is a figure which shows the detailed structure of the coil for electric power generation with which the rolling bearing apparatus with a sensor of the said 3rd Embodiment is provided. It is a figure which shows the detailed structure of the coil for electric power generation with which the rolling bearing apparatus with a sensor of the said 4th Embodiment is provided.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer ring 2 Inner ring 3 Ball 5 Sensor holding member 6 Yoke 7 Rotational speed detection device 8 Power generation device 11,13 Track groove 15 Annular portion 16 First disc portion 17 Resin mold portion 20 First cylindrical portion 21 Second cylinder Disk portion 22 Second cylindrical portion 30 First pulsar ring 31 Magnetic sensor 32 Second pulsar ring 33, 43, 53, 63 Power generation coil

Claims (3)

An outer ring having a raceway surface on the inner periphery;
An inner ring having a raceway surface on the outer periphery;
A rolling element disposed between the raceway surface of the outer ring and the raceway surface of the inner ring;
A first pulsar ring provided on one of the outer ring or the inner ring, and a rotational speed sensor provided on the other of the outer ring or the inner ring so as to face the first pulsar ring in the axial direction or the radial direction. A rotational speed detection device for detecting a relative rotational speed of the inner ring with respect to the outer ring;
The outer ring or the inner ring is provided on one of the outer ring or the inner ring and is opposed to the second pulsar ring, which is a separate member from the first pulsar ring, and the second pulsar ring in the axial direction or the radial direction. A power generating coil provided on the other side of the power generator and generating power using relative rotation of the inner ring with respect to the outer ring,
The rolling bearing device with a sensor, wherein the rotational speed sensor is driven by electric power generated by the power generation device. In the rolling bearing device with a sensor according to claim 1,
The sensor-equipped rolling bearing device, wherein an SN pitch of the first pulsar ring is smaller than an SN pitch of the second pulsar ring. In the rolling bearing device with a sensor according to claim 1 or 2,
An annular portion fitted in one end portion of the outer ring in the axial direction, and a first disc extending substantially inward in the radial direction from the axially outer end portion of the annular portion. A sensor holding member having a portion and a resin mold portion disposed in a region radially inward of the annular portion and inward of the axial direction of the first disc portion,
A first cylindrical portion fitted on one end portion in the axial direction of the inner ring, and a second circle extending outward in a substantially radial direction from an axially outer end portion of the first cylindrical portion. A yoke having a plate portion and a second cylindrical portion extending outward in a substantially axial direction from a radially outer end portion of the second disk portion; and a yoke made of a magnetic material. ,
The first pulsar ring is externally fitted and fixed to the outer peripheral surface of the second cylindrical portion of the yoke, and the rotational speed sensor is arranged such that the sensor surface faces the first pulsar ring in the radial direction. , Is fixed to the resin mold part,
The second pulsar ring is fitted and fixed to the inner peripheral surface of the second cylindrical portion of the yoke, and the power generating coil is axially opposed to the second pulsar ring. A rolling bearing device with a sensor, which is fixed to a mold part.

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