JP2009144897A - Rolling bearing device with sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact and inexpensive rolling bearing device with a sensor, reduced in an arranging space of an ABS sensor. <P>SOLUTION: The ABS sensor is composed of: a substrate 70, a first coil 71 arranged on a first surface 75 on one side of the substrate 70 so as to surround a first track member over the whole periphery; and a second coil 72 arranged on the first surface 75 so as not to surround the first track member. A rotating object speed detecting part formed by alternately arranging a plurality of same first parts 81 having first magnetic permeability and a plurality of same second parts (unillustrated) having second magnetic permeability different from the first magnetic permeability, in the peripheral direction of a cylindrical part 77 of a slinger 51, is formed in an opposite part in the radial direction to the first coil 71 in the cylindrical part 77 of the slinger 51. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a sensor-equipped rolling bearing device including a sensor and a raceway member, for example, a wheel rolling bearing device (hub unit) having a displacement sensor.

  Conventionally, as a rolling bearing device for wheels, there is one described in JP 2007-127253 A (Patent Document 1).

  In this wheel rolling bearing device, inductance-type displacement sensors are arranged in two rows in the axial direction, and three translational loads and two moment loads of the wheel rolling bearing device are calculated.

  In the above conventional wheel rolling bearing device, the inductance type displacement sensors must be arranged in two rows in the axial direction, and the arrangement space for the inductance type displacement sensor is large. It is difficult to reduce the size of the device.

In particular, when the wheel rolling bearing device is a wheel rolling bearing device for a driving wheel, it is difficult to secure a space for disposing the displacement sensor. In the conventional displacement sensor having a large arrangement space, the arrangement of the displacement sensor has an influence on the arrangement of the ABS sensor.
JP 2007-127253 A

  Accordingly, an object of the present invention is to provide a compact and inexpensive rolling bearing device with a sensor, in which an ABS sensor is disposed in a small space.

  It is another object of the present invention to provide a compact and inexpensive rolling bearing device with a sensor in which an ABS sensor and a displacement sensor can be easily arranged.

  Another object of the present invention is to provide a wheel rolling shaft device that can calculate a rotational speed, three translation loads, and two moment loads, and that is compact and inexpensive.

In order to solve the above problems, a rolling bearing device with a sensor according to the present invention comprises:
A first track member having a track surface on the outer peripheral surface;
A second race member having a raceway surface on an inner peripheral surface;
A plurality of rolling elements disposed between the raceway surface of the first raceway member and the raceway surface of the second raceway member;
An annular and plate-like first substrate having a through hole through which the first track member passes;
A planar first coil disposed on the first surface on one side of the first substrate so as to surround the first track member over the entire circumference;
A planar second coil disposed on the first surface,
The portion of the first surface surrounded by the second coil is located on the outer side in the radial direction of the first substrate than the through hole,
An annular rotational speed detector extending in the circumferential direction of the first track member is provided at an inner side in the radial direction of the first coil and at a location facing the first coil in the radial direction. Have
Fluctuation of the magnetic field generated by the first coil based on the structure of the rotational speed detection unit is detected by the second coil, and the first track with respect to the second track member is detected based on the signal output by the second coil. A rotation speed detection unit for detecting the rotation speed of the member is provided.

  According to the present invention, the ABS sensor (in this specification, the ABS sensor is defined as a sensor that detects the rotational speed) is configured by a coil disposed on one surface of the substrate. Can be reduced to about the thickness of the substrate, and the axial dimension of the ABS sensor can be drastically reduced as compared with an ABS sensor using a pulsar ring which has been conventionally used.

  Moreover, since the dimension of the ABS sensor in the axial direction can be reduced to about the thickness of the substrate, the displacement sensor can be easily arranged in the arrangement space of the ABS sensor.

  In addition, according to the present invention, for example, an ABS sensor can be composed of a glass substrate and wiring printed on the glass substrate. Therefore, an ABS sensor using a relatively expensive pulsar ring as the ABS sensor. The manufacturing cost of the ABS sensor can be drastically reduced as compared with a conventional rolling bearing device with a sensor using the above. Therefore, the manufacturing cost is reduced as compared with a conventional rolling bearing device with a sensor.

In one embodiment,
The first substrate is disposed substantially parallel to the radial direction of the second track member,
An annular and plate-like second substrate having a surface substantially parallel to the first surface of the first substrate and having a through hole through which the first track member passes;
A planar third coil disposed on a surface substantially parallel to the first surface of the second substrate so as to surround the outer peripheral surface of the first track member over the entire circumference;
A planar fourth coil disposed on a surface substantially parallel to the first surface of the second substrate,
A portion surrounded by the fourth coil on a surface substantially parallel to the first surface of the second substrate is located radially outward from the through hole of the second substrate.

  According to the embodiment described above, the third coil and the fourth coil are formed at an interval in the axial direction with respect to the first coil and the second coil. Here, the set of the third coil and the fourth coil can function as a gap sensor as described in the embodiment. Therefore, according to the above embodiment, the rotational speed can be detected and the radial displacement can be measured.

In one embodiment,
A planar third coil disposed on the second surface on the other side of the first substrate so as to surround the outer peripheral surface of the first track member over the entire circumference;
A planar fourth coil disposed on the second surface,
The portion of the second surface that is surrounded by the fourth coil is located outward in the radial direction of the first substrate from the through hole.

  According to the embodiment described above, the third coil and the fourth coil are formed at an interval in the axial direction with respect to the first coil and the second coil. Here, the set of the third coil and the fourth coil can function as a gap sensor as described in the embodiment. Therefore, according to the above embodiment, the rotational speed can be detected and the radial displacement can be measured.

In one embodiment,
The first substrate is disposed substantially parallel to the radial direction of the second track member,
An annular and plate-like second substrate having a surface substantially parallel to the first surface of the first substrate and having a through hole through which the first track member passes;
A planar third coil disposed on a surface substantially parallel to the first surface of the second substrate so as to surround the outer peripheral surface of the first track member over the entire circumference;
A planar fourth coil disposed on a surface substantially parallel to the first surface of the second substrate,
A portion surrounded by the fourth coil on a surface substantially parallel to the first surface of the second substrate is located radially outward from the through hole of the second substrate,
A planar fifth coil arranged on the second surface on the other side of the first substrate so as to surround the outer peripheral surface of the first track member over the entire circumference;
A planar sixth coil disposed on the second surface,
The portion of the second surface surrounded by the sixth coil is located on the outer side of the first substrate in the radial direction than the through hole of the first substrate.

  According to the embodiment, in addition to the first and second coils used to detect the rotational speed, the coil formed so as to surround the outer peripheral surface of the first track member over the entire circumference, and the coil Are arranged in two rows in the axial direction, with the coil being placed on the same board surface and the coil surrounding part being positioned radially outward from the through hole of the board. Therefore, in addition to the rotational speed, the moment load acting on the rolling bearing can be detected.

In one embodiment,
A seal device for sealing between the first track member and the second track member;
The first substrate is fixed to the sealing device.

  According to the above embodiment, since the ABS sensor can be arranged integrally with the seal device, the sensor-equipped rolling bearing device becomes more compact. Further, for example, when the rolling bearing device with sensor is a wheel rolling bearing device for driving wheels, the ABS sensor can be fixed to the seal device close to the constant velocity joint. Even in the case of a wheel rolling bearing device for driving wheels having a small arrangement space, the ABS sensor can be easily arranged.

In one embodiment,
The sealing device has a metal cored bar part and a rubber elastic part fixed to the cored bar part,
The first substrate is fixed to the elastic part.

  According to the embodiment, since the first substrate is fixed to the elastic portion made of rubber, the elastic portion can function as a cushion, and the first substrate can be prevented from being damaged. The substrate can be securely fixed.

  Moreover, according to the said embodiment, since a 1st board | substrate is fixed to the rubber member which is an insulating material, a rotational speed signal can be detected reliably.

  According to the rolling bearing device with a sensor of the present invention, since the ABS sensor is constituted by a coil disposed on one surface of the substrate, the dimension in the axial direction of the ABS sensor can be reduced to about the thickness of the substrate. Compared with the ABS sensor etc. which use the pulsar ring currently used conventionally, the dimension of can be made small rapidly. Moreover, since the dimension of the ABS sensor in the axial direction can be reduced to about the thickness of the substrate, the displacement sensor can be easily arranged in the arrangement space of the ABS sensor.

  Moreover, according to the rolling bearing device with a sensor of the present invention, for example, an ABS sensor can be composed of a glass substrate and wiring printed on the glass substrate, so that a relatively expensive pulsar ring can be used as an ABS sensor. The manufacturing cost of the ABS sensor can be drastically reduced as compared with a conventional rolling bearing device with a sensor that uses an ABS sensor or the like. Therefore, the manufacturing cost is reduced as compared with a conventional rolling bearing device with a sensor.

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

  FIG. 1 is a sectional view in the axial direction of a hub unit for a drive wheel, which is a first embodiment of a rolling bearing device with a sensor according to the present invention.

  This hub unit includes a drive wheel hub (hereinafter simply referred to as a hub) 1, an inner ring 2, an outer ring 3, a plurality of first balls 4 as rolling elements, a plurality of second balls 5 as rolling elements, and A pack seal 10 as an example of a sealing device is provided. The hub 1 and the inner ring 2 constitute a first race member, and the outer ring 3 constitutes a second race member.

  The hub 1 is a cylindrical member having a female spline on a part of the inner peripheral surface, and this female spline is spline-fitted to the spline shaft 15 of the constant velocity joint 31. The hub 1 has a small diameter shaft portion 19 and a large diameter shaft portion 20. The large-diameter shaft portion 20 is connected to the small-diameter shaft portion 19 via the step portion 18 and has an outer diameter larger than the outer diameter of the small-diameter shaft portion 19. The outer peripheral surface of the large-diameter shaft portion 20 has an angular track groove as a track surface. The outer diameter of the raceway groove increases as the distance from the small-diameter shaft portion 19 increases.

  The hub 1 has a rotor mounting flange (or wheel mounting flange) 22 for mounting a rotor (or a wheel) (not shown) at an end of the large-diameter shaft portion 20 in the axial direction. ing.

  The inner ring 2 is fitted and fixed to the outer peripheral surface of the small-diameter shaft portion 19 of the hub 1. The end surface of the inner ring 2 on the large diameter shaft portion 20 side in the axial direction is in contact with the stepped portion 18. The inner ring 2 has an angular track groove as a track surface on the large-diameter shaft portion 20 side of the outer peripheral surface thereof. The outer diameter of the raceway groove increases as the distance from the large diameter shaft portion 20 increases.

  The outer ring 3 is located radially outward of the small diameter shaft portion 19 and the large diameter shaft portion 20 of the inner shaft 1. The inner peripheral surface of the outer ring 3 has an angular first raceway groove as a raceway surface and an angular second raceway groove as a raceway surface. The first raceway groove is opposed to the raceway groove of the inner ring 2 in the radial direction, and the second raceway groove is opposed to the raceway groove of the hub 1 in the radial direction.

  The plurality of first balls 4 are disposed between the raceway groove of the inner ring 2 and the first raceway groove of the outer ring 3 in a state of being held by a cage and spaced from each other in the circumferential direction. . The plurality of second balls 5 are disposed between the raceway groove of the hub 1 and the second raceway groove of the outer ring 3 at intervals in the circumferential direction while being held by a cage. ing.

  The pack seal 10 seals between the inner ring 2 and the outer ring 3. Although not described in detail, in FIG. 1, 30 indicates a knuckle.

  FIG. 2 is an enlarged sectional view in the axial direction in the vicinity of the pack seal 10.

  The pack seal 10 includes an annular seal member 50 and an annular slinger 51, and the seal member 50 includes a non-magnetic metal cored bar portion 53 such as SUS304L and an elastic portion 54. ing. The cored bar portion 53 has a substantially cylindrical tube portion 86 and a radially extending portion 87, and the tubular portion 86 is fixed to the outer ring 3 via an elastic member 80, while the radially extending portion 86. The existing portion 87 extends radially inward from the end of the cylindrical portion 86 on the side of the balls 4 and 5 in the axial direction. The elastic part 54 is fixed to the surface of the cored bar part 53.

  On the other hand, the slinger 51 is externally fitted and fixed to the outer peripheral surface of the inner ring 2 (see FIG. 1). The slinger 51 is made of a magnetic material (for example, SUS430). The slinger 51 has a cylindrical portion 77 fixed to the inner ring 2 and a flange portion 78, and the flange portion 78 has a diameter from the end of the cylindrical portion 77 opposite to the balls 4 and 5 in the axial direction. Extends outward in the direction.

  As shown in FIG. 2, the elastic portion 54 has a block-like base portion 59, an axial lip 60, a first radial lip 61, and a second radial lip 62, and the base portion 59 is fixed to the cored bar portion 53. Has been. A surface (hereinafter, referred to as a board mounting surface) 83 in the axial direction of the base portion 59 on the balls 4 and 5 side extends in the radial direction and has a planar shape. The axial lip 60 slides on the flange portion 78, while the first and second radial lips 61 and 62 slide on the outer peripheral surface of the cylindrical portion 77.

  A flat substrate 70 having a thickness of about several mm is fixed to the substrate mounting surface 83 with an adhesive. The substrate 70 is made of a glass cloth base epoxy resin. The substrate 70 is annular and extends in the radial direction. A planar first coil 71 and a planar second coil 72 are provided on a surface (corresponding to a surface on one side of the first substrate) 75 opposite to the substrate mounting surface 83 side of the substrate 70. The pattern is formed.

  A portion of the cylindrical portion 77 of the slinger 51 that is opposed to the first coil 71 in the radial direction serves as a rotation speed detection unit. The rotational speed detection unit includes a plurality of identical first portions 81 having a first permeability and a plurality of identical second portions having a second permeability different from the first permeability (see FIG. (Not shown) are alternately arranged in the circumferential direction of the cylindrical portion 77 of the slinger 51.

  FIG. 3 is a schematic diagram showing a positional relationship among the slinger 51, the substrate 70, the first coil 71, and the second coil 72. As shown in FIG.

  As shown in FIG. 3, the slinger 51 passes through the through hole 89 of the annular substrate 70 (as is clear from this and FIG. 1, the first track member also passes through the through hole 89. ) The first coil 71 is formed on one surface 75 of the substrate 70 so as to surround the first track member (consisting of the hub 1 and the inner ring 2) over the entire circumference. On the other hand, the second coil 72 is formed in a contact spiral shape on the one surface 75 so as not to contact the first coil 71. The second coil 72 is disposed so as not to surround the first track member. A portion of the one surface 75 of the substrate 70 that is surrounded by the second coil 72 is located outward in the radial direction of the substrate 70 from the through hole 89 of the annular substrate 70.

  There are four second coils 72, and the four second coils 72 are arranged at equal intervals in the circumferential direction. For example, a high-frequency current from 100 KHz to 10 MHz is generated by the oscillator 90, and this high-frequency current flows into the first coil 71 via the cable 91.

  Since the slinger 51 is made of a magnetic material, the magnetic flux generated by the first coil 71 passes through the slinger 51. Therefore, when a load acts on the slinger 51 and the slinger 51 approaches a certain second coil 72, an induced electromotive force generated in the second coil 72 based on a high-frequency magnetic field generated by the first coil 71 is generated. On the other hand, when a load acts on the slinger 51 and the slinger 51 moves away from a certain second coil 72, the induced electromotive force generated in the second coil 72 based on the high-frequency magnetic field generated by the first coil 71 is increased. Get smaller.

  Therefore, when the slinger 51 is formed of the same magnetic material, the distance between each second coil 72 and the slinger 51 can be measured by measuring the induced electromotive force generated by each second coil 72.

  Further, as in the first embodiment, the portions of the slinger 51 that are opposed to the first coil 71 in the radial direction are alternately located in the circumferential direction, and two portions having different magnetic permeability (first portion) 81 and the second portion), or when the unevenness is repeated in a gear shape in the circumferential direction, the induced electromotive force generated by the second coil 72 is relative to the substrate 70 relative to the slinger 51. The induced electromotive force has a periodicity depending on the rotation speed (the relative rotation speed of the second track member with respect to the first track member), and the rotation speed of the second track member with respect to the first track member is detected by detecting this period. Can be detected.

  In the rolling bearing device with a sensor according to the first embodiment, each second coil 72 is thus used as an ABS sensor (rotational speed detection sensor) for measuring the magnetic flux density deviation (slinger (first track member) deviation). It is used to detect the relative rotational speed of the second track member with respect to the first track member.

  Referring to FIG. 2 again, the electromotive force generated in each second coil 72 is output to a signal processing unit (not shown) via the signal line 38. In this signal processing unit, the relative rotational speed of the second track member with respect to the first track member is detected based on the output signals from the four second coils 72. The signal processing unit constitutes a rotation speed detection unit. The signal line 38 is waterproofed by the elastic portion 80.

  According to the rolling bearing device with a sensor of the first embodiment, since the ABS sensor is constituted by the coils 71 and 72 arranged on one surface of the substrate 70, the dimension of the ABS sensor in the axial direction is determined by the thickness of the substrate 70. The size in the axial direction of the ABS sensor can be drastically reduced as compared with a conventional sensor. Therefore, the arrangement space of the rolling bearing device with sensor can be reduced. In the case where the displacement sensor is arranged, both the ABS sensor and the displacement sensor can be easily arranged without any obstacles.

  Moreover, according to the rolling bearing device with a sensor of the said 1st Embodiment, the main-body part of an ABS sensor is comprised with the board | substrate 70 made from an inexpensive glass cloth base-material epoxy resin, and the wiring printed on the board | substrate 70. Therefore, the manufacturing cost of the ABS sensor can be drastically reduced, and the manufacturing cost can be reduced as compared with a conventional rolling bearing device with a sensor.

  Moreover, according to the rolling bearing device with a sensor of the said 1st Embodiment, since the main-body part of an ABS sensor is integrally arrange | positioned to the pack seal 10 as a sealing device, a rolling bearing device with a sensor is more compact. become. And especially in 1st Embodiment, the rolling bearing apparatus with a sensor is a wheel rolling bearing apparatus for driving wheels, Comprising: It comprises the main body (the board | substrate 70, the 1st and 2nd coils 71 and 72) of an ABS sensor. Is fixed to the pack seal 10 close to the joint portion of the constant velocity joint, and therefore the sensor-equipped rolling bearing device is a wheel rolling bearing device for a driving wheel having a small arrangement space for the ABS sensor. The displacement sensor can be easily arranged in the ABS sensor arrangement space after the ABS sensor is installed.

  Moreover, according to the rolling bearing device with a sensor of the first embodiment, since the substrate 70 is fixed to the rubber elastic portion 54, the elastic portion 54 can function as a cushion. The substrate 70 can be securely fixed while preventing the damage.

  Further, according to the first embodiment, since the substrate 70 is fixed to the rubber member that is an insulating material, the displacement signal output from the ABS sensor does not deteriorate.

  In the rolling bearing with a sensor according to the first embodiment, the first coil 71 is opposed to the cylindrical portion 77 of the slinger 51, and a part of the cylindrical portion 77 of the slinger 51 facing the first coil 71 is circumferentially arranged. In this invention, the first coil 81 is opposed to the outer peripheral surface of the first track member, and the first coil 81 is opposed to the first coil. You may arrange | position the 1st part and 2nd part from which a magnetic permeability mutually differs alternately in the circumferential direction in a part of track member. In other words, in the present invention, the rotational speed detector may be formed on a part of the first track member instead of the slinger.

  Moreover, in the rolling bearing device with a sensor of the said 1st Embodiment, although the 1st coil 71 was arrange | positioned at intervals in the 2nd coil 72, in this invention, a 1st coil and a 2nd coil are a contact. You may do it. In short, the first coil may be disposed so as to surround the hole of the annular substrate, and the second coil may be disposed so as not to surround the hole of the annular substrate.

  In the rolling bearing device with a sensor according to the first embodiment, the number of the second coils 72 is four. In the present invention, the number of the second coils is any number other than four (1 to 3). Or 5 or more).

  In the rolling bearing device with a sensor according to the first embodiment, the rotational speed detection unit includes a plurality of identical first portions 81 having a first magnetic permeability, and a second different from the first magnetic permeability. A plurality of identical second portions (not shown) having magnetic permeability are arranged alternately in the circumferential direction of the cylindrical portion 77 of the slinger 51.

  However, in this invention, you may form a to-be-rotated speed detection part by repeating an unevenness | corrugation like a gear shape in the circumferential direction alternately. Even in this case, the induced electromotive force generated by the second coil when the concave portion approaches the second coil and the induction generated by the second coil when the convex portion approaches the second coil. This is because a difference occurs in the electromotive force, and the relative rotational speed of the second track member with respect to the first track member can be detected based on the induced electromotive force generated by the second coil.

  Further, in the rolling bearing device with sensor of the first embodiment, the substrate 70 is fixed to the pack seal 10, but in the present invention, the substrate is a sealing device other than the pack seal, for example, a cored bar portion that does not have a slinger. And a sealing device having an elastic part. Moreover, in this invention, you may fix a board | substrate to parts other than a sealing device like the below-mentioned embodiment demonstrated below.

  FIG. 4 is a view corresponding to FIG. 2 in the rolling bearing device with sensor of the second embodiment, and is a sectional view in the axial direction around the pack seal 10 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 structure of the substrate 170 and the slinger 151.

  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 effect and modification which are common in the rolling bearing device with a sensor of 1st Embodiment, and the rolling bearing with a sensor of 1st Embodiment is omitted. Only configurations, operational effects, and modifications different from those of the apparatus will be described.

  In the second embodiment, a planar first coil 171 and four planar second coils 172 are formed on one surface 175 of the substrate 170 on the opposite side to the cored bar 53 side in the axial direction. The planar third coil 181 and the four planar fourth coils 182 are formed on the other surface 185 in the axial direction of the substrate 170. The other surface 185 is fixed to the substrate mounting surface 83 of the elastic portion 54 of the pack seal 10 with an adhesive, a resin mold, or the like.

  The first coil 171 and the second coil 181 are formed so as to surround the first track member (consisting of the hub 1 and the inner ring 2) over the entire circumference. As in the first embodiment, the first coil 171 and the second coil 181 are applied with a high-frequency current to generate a high-frequency magnetic field.

  The second coil 172 is formed in a spiral shape outside the first coil 171 of the substrate 170 in the radial direction so as not to contact the first coil 171 (see FIG. 3). The second coil 172 is disposed so as not to surround the first track member (consisting of the hub 1 and the inner ring 2). There are four second coils 172, and the four second coils 172 are arranged at equal intervals in the circumferential direction.

  The fourth coil 182 is formed in a spiral shape outside the third coil 181 of the substrate 170 in the radial direction so as not to contact the third coil 181 (see FIG. 3). The fourth coil 182 is arranged so as not to surround the first track member (consisting of the hub 1 and the inner ring 2). There are four fourth coils 182, and the four fourth coils 182 are arranged at equal intervals in the circumferential direction.

  The first coil 171 and the third coil 181 substantially overlap in the normal direction of the substrate 170, and the second coil 172 and the fourth coil 182 substantially overlap in the normal direction of the substrate 170. The induced electromotive force generated by each second coil 172 is output to the signal processing unit via the signal line, and the induced electromotive force generated by the wound fourth coil 182 is output to the signal processing unit via the signal line. It is like that.

  A portion of the cylindrical portion 177 of the slinger 151 diametrically opposed to the first coil 171 includes a plurality of identical first portions 187 having a first magnetic permeability, and a second different from the first magnetic permeability. A plurality of identical second portions (not shown) having magnetic permeability are alternately arranged in the circumferential direction of the cylindrical portion 177 of the slinger 151.

  A portion of the cylindrical portion 177 of the slinger 151 that is opposed to the first coil 171 in the radial direction is a rotational speed detection unit. The rotational speed detector includes a plurality of identical first portions 187 having a first permeability and a plurality of identical second portions having a second permeability different from the first permeability (see FIG. (Not shown) are alternately arranged in the circumferential direction of the cylindrical portion 177 of the slinger 151.

  According to the rolling bearing device with a sensor of the second embodiment, the rotational speed can be detected and the radial displacement of the second race member relative to the first race member can be measured.

  In the rolling bearing device with a sensor according to the second embodiment, the rotational speed detection unit is formed at a position facing the first coil 171 disposed on the surface of the substrate 70 not fixed to the pack seal 10 in the radial direction. On the other hand, the rotational speed detector was not formed at a position facing the third coil 181 disposed on the surface of the substrate 70 fixed to the pack seal 10 in the radial direction.

  However, in the present invention, the rotational speed detecting portion is not formed at a position facing the first coil arranged on the surface of the substrate not fixed to the pack seal in the radial direction, while the substrate fixed to the pack seal is not formed. The rotational speed detecting portion may be formed at a position facing the third coil arranged on the surface in the radial direction, and the coil formed on the surface of the pack seal side of the substrate is used as a rotational speed detecting coil. A coil formed on the surface of the substrate opposite to the pack seal side may be used as a displacement detection coil.

In the rolling bearing device with a sensor according to the second embodiment, the third coil 181 is opposed to the slinger 151 and the distance between the substrate 170 and the slinger 151 is measured. In the present invention, the third coil is the first coil. Instead of facing the one track member, the radial distance between the substrate and the first track member may be measured instead of the radial distance between the substrate and the slinger.

  FIG. 5 is a view corresponding to FIG. 2 in the rolling bearing device with sensor according to the third embodiment of the present invention, and is a sectional view in the axial direction around the pack seal 10 according to the third embodiment.

  The rolling bearing device with a sensor according to the third embodiment differs from the rolling bearing device with a sensor according to the first embodiment only in that there are a plurality of substrates 270 and 271 and the structure of the slinger 251.

  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, it abbreviate | omits description about the effect and modification which are common with the rolling bearing device with a sensor of 1st-2nd embodiment, and 1st-2nd embodiment. Only configurations, operational effects, and modifications different from those of the sensor-equipped rolling bearing device will be described.

  As shown in FIG. 5, the rolling bearing device with sensor of the third embodiment includes a first substrate 270 made of glass cloth base epoxy resin and a second substrate 277 made of glass cloth base epoxy resin. The first substrate 270 is located on the opposite side of the second substrate 277 from the pack seal 10 side. A planar first coil 271 and four planar second coils 272 are arranged on one surface of the first substrate 270 opposite to the second substrate 277 side.

  The second substrate 277 is the same substrate as the first substrate 270 and is disposed substantially parallel to the first substrate 270. One surface of the second substrate 277 is fixed to the substrate mounting surface 83 of the elastic portion 54. A planar third coil 281 and four planar fourth coils 282 are disposed on the other surface of the second substrate 277.

  The surface on the other side of the first substrate 270 is fixed to the surface on one side of the first substrate 270.

  The positional relationship between the first coil 271 and the four second coils 272 is the same as the relationship between the first coil 71 and the four second coils 72 in FIG. The positional relationship with the fourth coil 282 is the same as the relationship between the first coil 71 and the four second coils 72 in FIG.

  The first coil 271 and the third coil 281 substantially overlap in the normal direction of the substrate 270, and the second coil 272 and the fourth coil 282 substantially overlap in the normal direction of the substrate 170.

  A portion of the cylindrical portion 277 of the slinger 251 that is opposed to the first coil 271 in the radial direction is a rotational speed detection unit. The rotational speed detector includes a plurality of identical first portions 287 having a first magnetic permeability and a plurality of identical second portions having a second magnetic permeability different from the first magnetic permeability (FIG. (Not shown) are alternately arranged in the circumferential direction of the cylindrical portion 277 of the slinger 251.

  The rolling bearing device with a sensor according to the third embodiment is essentially different from the rolling bearing device with a sensor according to the second embodiment only in that the number of substrates is increased from one to two. This point is the same as the rolling bearing with sensor of the second embodiment.

  In the rolling bearing device with a sensor according to the third embodiment, the rotational speed detection unit is located at a position radially facing the first coil 171 disposed on the surface of the first substrate 270 that is not fixed to the pack seal 10. On the other hand, the rotational speed detector was not formed at a position facing the third coil 181 disposed on the surface of the second substrate 270 fixed to the pack seal 10 in the radial direction.

  However, in the present invention, the rotational speed detecting portion is not formed at a position opposed to the first coil disposed on the surface of the first substrate that is not fixed to the pack seal in the radial direction, but is fixed to the pack seal. The rotational speed detector may be formed at a position facing the third coil disposed on the surface of the second substrate in the radial direction.

  FIG. 6 is a view corresponding to FIG. 2 in the rolling bearing device with a sensor according to the fourth embodiment of the present invention, and is a sectional view in the axial direction around the pack seal 10 according to the fourth embodiment.

  The rolling bearing device with a sensor according to the fourth embodiment arranges sensors composed of two sets of coils in three rows instead of two in the axial direction, and two of the three sensors as described below. Thus, the point that the five loads are detected and the remaining one sensor detects the rotational speed is different from the rolling bearing device with sensor of the first to third embodiments.

  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, description is abbreviate | omitted about the effect and modification which are common in the rolling bearing device with a sensor of 1st-3rd embodiment, and 1st-3rd embodiment. Only configurations, operational effects, and modifications different from those of the sensor-equipped rolling bearing device will be described.

  The sensor-equipped rolling bearing device of the fourth embodiment includes a first substrate 370 made of a glass cloth base epoxy resin and a second substrate 377 made of a glass cloth base epoxy resin, and a surface on one side of the first substrate 370. Is fixed to the board mounting surface 83 of the elastic portion 54. A planar first coil 371 and four planar second coils 372 are arranged on the other side surface of the first substrate 270, while on the one side surface of the first substrate 270, A planar third coil 381 and four planar fourth coils 382 are arranged.

  The second substrate 377 is the same substrate as the first substrate 370 and is disposed substantially parallel to the first substrate 370. One surface of the second substrate 377 is fixed to the other surface of the first substrate 370. A planar fifth coil 391 and four planar sixth coils 392 are arranged on the other surface of the second substrate 377.

  The positional relationship between the first coil 371 and the four second coils 372, the positional relationship between the third coil 381 and the four fourth coils 382, and the fifth coil 391 and the four sixth coils 392. Is the same as the relationship between the first coil 71 and the four second coils 72 in FIG. 3.

  The first coil 371, the third coil 381, and the fifth coil 391 substantially overlap in the normal direction of the substrate 370, and the second coil 372, the fourth coil 382, and the sixth coil 392 are in the normal direction of the substrate 370. It is almost overlapping.

  A portion of the cylindrical portion 376 of the slinger 351 that is opposed to the first coil 371 in the radial direction is a rotational speed detection unit. The rotational speed detecting unit includes a plurality of identical first portions 313 having a first permeability and a plurality of identical second portions having a second permeability different from the first permeability (see FIG. (Not shown) are alternately arranged in the circumferential direction of the cylindrical portion 376 of the slinger 351.

  A portion of the outer peripheral surface of the cylindrical portion 376 of the slinger 351 facing the third coil 381 in the radial direction has a first annular groove 311 extending in the circumferential direction, and the cylindrical portion 376 of the slinger 351 A portion of the outer peripheral surface facing the fifth coil 391 in the radial direction has a second annular groove 312 extending in the circumferential direction.

  The first annular groove 311 and the second annular groove 312 have the same shape and are spaced apart from each other in the axial direction. The first annular groove 311 and the second annular groove 312 have a rectangular cross section in the axial cross section.

  As shown in FIG. 6, in the state where no load is applied to the first track member and the second track member, the first annular groove 311 is substantially formed by the extended surface of the surface of the first substrate 370 on the pack seal 10 side. The second annular groove 312 is vertically bisected by an extended surface of the surface of the second substrate 377 opposite to the first substrate 370 side.

  In the above-described configuration, the rolling bearing device with a sensor according to the fourth embodiment includes the first coil 371, the second coil 372, and the rotation speed detector as described above, and the rotation speed of the second track member with respect to the first track member. Is detected.

  Moreover, the rolling bearing device with a sensor of 4th Embodiment detects five loads as follows.

  That is, when an axial load is applied to the sensor-equipped rolling bearing device and the slinger 351 is displaced in the direction indicated by the arrow A in FIG. 6, the first annular groove 311 and the first annular groove 311 with respect to the first and second substrates 370 and 377. The relative position with respect to the two annular grooves 312 is displaced, and accordingly, the magnetic field is changed, and the induced electromotive force detected by the fourth and sixth coils 382 and 392 is also changed. In the fourth embodiment, the axial displacement is detected based on the change in the induced electromotive force, and the load acting in the axial direction is detected.

  Further, when a moment load acts on the sensor-equipped rolling bearing device and the cylindrical portion 376 of the slinger 135 is tilted from the position shown in FIG. 6 in the direction indicated by the arrow B in FIG. 6, the first substrate 370 and the slinger The distance between the cylindrical portion 376 of the 351 and the distance between the cylindrical portion 376 of the second substrate 377 and the slinger 351 become different values, and accordingly, the induced electromotive force detected by the fourth coil 382 and the sixth coil 392. A difference is generated between the induced electromotive force detected by the In the fourth embodiment, the moment load is detected based on the difference between the induced electromotive forces.

  For example, in the case of the fourth embodiment, a signal processing unit (not shown, including a rotation speed detection unit) that receives signals from four fourth coils 382 and four sixth coils 392 performs the following calculation: The moment load and the translation load in each direction acting on the wheel may be calculated.

  FIG. 7 is a diagram illustrating the direction.

  As shown in FIG. 7, in the fourth embodiment, the front-rear horizontal direction of the wheel is defined as the x-axis direction, the left-right horizontal direction (axial direction) of the wheel is defined as the y-axis direction, and the vertical direction of the wheel is defined as the z-axis direction.

  Further, the subscript “i” is used as the displacement detection value of the fourth coil 382t, 382b, 382f, 382r on the inner side (vehicle center side), and the sixth coil 392t, 392b, The subscript “o” is used for 392f and 392r. In addition, the four fourth coils 382 are arranged on the front side, the rear side, the upper side and the lower side of the vehicle on the first substrate 370, and the four sixth coils 392 are arranged on the front side of the vehicle on the second substrate 377, Disposed on the rear side, upper side and lower side, the displacement detection value of the front sensor is defined as “f (front)”, the displacement detection value of the rear sensor is defined as “r (rear)”, The displacement detection value of the sensor is defined as “t (top)”, and the displacement detection value of the lower sensor is defined as “b (bottom)”.

That is, the displacement detection values of a total of eight fourth and sixth coils 382 and 392 (hereinafter, each fourth coil and each sixth coil is referred to as a sensor) are defined as follows.
fi: displacement detection value of displacement sensor 382f ri: displacement detection value of displacement sensor 382r ti: displacement detection value of displacement sensor 382t bi: displacement detection value of displacement sensor 382b fo: displacement detection value of displacement sensor 392f ro: displacement sensor 392r Displacement detection value of to: displacement detection value of displacement sensor 392t bo: displacement detection value of displacement sensor 392b

Further, the five differential signals x1, x2, z1, z2 and y1 are defined as follows.
x1 = fi-ri
x2 = fo-ro
z1 = bi-ti
z2 = bo-to
y1 = fi + ri + ti + bi− (fo + ro + to + bo)

  8 to 12 are diagrams showing an experimental example in which the relationship between the value of the differential signal and the force or load actually applied to the hub unit is investigated. 8 to 12, the vertical axis represents the value of the differential signal (here, the differential signal is indicated by the voltage value), and the horizontal axis actually acts on the hub unit. Force or moment value.

  Specifically, FIG. 8 shows the output of the differential signal when a force is applied to the hub unit only in the direction indicated by the arrow Fx in FIG. 7, and FIG. FIG. 10 shows the output of the differential signal when force is applied only in the direction indicated by the arrow Fy. FIG. 10 shows the case where force is applied to the hub unit only in the direction indicated by the arrow Fz in FIG. This shows the output of the differential signal.

  FIG. 11 shows the output of the differential signal when only the moment load indicated by the arrow Mz in FIG. 7 is applied to the wheel. FIG. 12 shows the moment indicated by the arrow Mz in FIG. The output of the differential signal when only a load is applied is shown.

  As shown in FIG. 8, when only the force in the x direction is applied to the hub unit, the magnitude (Fx) of the force and the value of the differential signal in the x direction show a linear relationship (proportional relationship). ing. Further, as shown in FIG. 9, when only the force in the y direction is applied to the hub unit, the magnitude (Fy) of the force and the value of the differential signal in the y direction have a linear relationship (proportional relationship). Is shown. As shown in FIG. 10, when only a force in the z direction is applied to the hub unit, the magnitude (Fz) of the force and the value of the differential signal in the z direction have a linear relationship (proportional relationship). Is shown.

  As shown in FIGS. 11 and 12, when a moment load about the x-axis is applied to the wheel, the magnitude (Mx) of the moment and the differential signal value in the z direction are linearly related. (Proportional relationship) and when a moment load is applied to the wheel around the z-axis, the magnitude of the moment (Mz) and the value of the differential signal in the x direction are linear (proportional) Relationship).

  11 and 12, the inner sensor has a larger value than the outer sensor (wheel side sensor) because the distance from the wheel is larger.

  8, 10, 11, and 12, the differential signal in the y direction shows a value (crosstalk) that is not 0 (zero). This is a value of 筈 which is originally 0 (zero). This crosstalk signal is an erroneous signal that is considered to be generated by increasing the detection capability of the sensor, and is a signal that does not affect the calculation of the load.

  As shown in FIGS. 8 to 12, the force (load) and each differential signal are in a linear relationship (proportional relationship).

ここで、例えば、ｍ１１は、図８におけるｘ１の傾きを示す定数であり、他の行列要素も、図８〜１２の各直線の傾きから決定される定数である。 Therefore, the following relationship (1) is established from FIGS.

Here, for example, m11 is a constant indicating the slope of x1 in FIG. 8, and the other matrix elements are also constants determined from the slopes of the straight lines in FIGS.

The following equation (2) is derived from the above (1).

  The signal processing unit of the hub unit of the present embodiment has a storage unit, and this storage unit is represented by nij in the above equation (2) (each of i and j takes a value of 1 to 5). The 25 elements of the 5 × 5 constant matrix are input in advance as a look-up table.

  In the hub unit of this embodiment, when each sensor outputs a signal to the signal processing unit, the signal processing unit calculates the differential signals x1, x2, z1, z2, and y1 based on those signals. After that, from the calculated x1, x2, z1, z2, and y1 and 25 elements nij of the 5-by-5 constant matrix stored in the storage unit, the calculation of the expression (2) is performed. Thus, Fx, Fy, Fz, Mx and Mz, which are actual forces (loads) acting on the hub unit, are calculated.

  According to the hub unit of the above-described embodiment, simply referring to the above nij, the vehicle's vertical translational load, the vehicle translational translational load, the wheel axial translational load, The moment load around the vertical direction and the moment load around the traveling direction of the vehicle can be calculated.

  In the hub unit of the above embodiment, the differential signal in the y direction is y1 = fi + ri + ti + bi− (fo + ro + to + bo). However, in the rolling bearing device with a sensor of the present invention, instead of y1 = fi + ri + ti + bi− (fo + ro + to + bo), fi-fo, ri-ro, ti-to, bi-bo, fi + ri- (fo + ro), etc., the output of at least one of the four sensors constituting the first displacement detector, and the four sensors A difference from the output of at least one sensor of the second displacement detector that substantially overlaps at least one of the sensors in the axial direction may be adopted as a differential signal in the y direction.

  In the above embodiment, the five loads Fx, Fy, Fz, Mx, and Mz are calculated from the five differential signals.

  However, as in other embodiments of the present invention described below, a signal processing unit as a calculation unit may perform the following calculation instead of the calculation described above.

  The wheel radius fluctuates dynamically and may cause an error when handled as an eigenvalue, but when the detection signal is used for vehicle control, the accuracy of the measuring instrument level (≦ 1 to 2%) is not required, and the tire radius Even if the value is fixed, vehicle control is not greatly affected. In an actual vehicle, only Mx is not generated, and Mx is generated by Fy. Therefore, if the tire radius R is regarded as a fixed value, Mx≈Fy × R is established.

  From this, four values of fi-ri, ti-bi, fo-ro, to-ro, (fi + ri + ti + bi- (fo + ro + to + bo)), a 4-by-4 constant matrix, and Fy The Fz, Fx, Fy, Mz, and Mx may be calculated based on the relational expression = Mx ÷ R.

  Specifically, for example, Fx, Fz, Mx, and Mz are obtained by the following equation (4), and then Fy is calculated from the obtained Mx based on the equation Fy = Mx ÷ R. good.

この４行４列の逆行列を使用して、

First, from FIG. 8 to FIG. 12, a 4-by-4 constant matrix that satisfies the following relationship (3) is obtained.

Using this 4-by-4 inverse matrix,

  In this case, it goes without saying that the value of pij (i, j = 1 to 4) is input in advance as a lookup table in the storage unit of the signal processing unit as the calculation unit.

  In place of the above (3) and (4), Fx, Fy, Fz, Mx, and Mz may be obtained based on the following equations (5) and (6) and Fy = Mx ÷ R. Needless to say.

この４行４列の逆行列を使用して、

First, from FIG. 8 to FIG. 12, a 4-by-4 constant matrix that satisfies the following relationship (5) is obtained.

Using this 4-by-4 inverse matrix,

  In this case, it goes without saying that the value of qij (i, j = 1 to 4) is input in advance as a lookup table in the storage unit of the signal processing unit as the calculation unit.

  In short, Fx, Fy, Fz, Mx, and Mz can be calculated by the following steps.

  In other words, any one of four differential vectors of five differential signals is adopted while adopting either a quaternary vector of Fx, Fy, Fz, Mz or a quaternary vector of Fx, Fz, Mz, Mx. Adopt signal. Thereafter, an equation corresponding to the above equation (5) is created for the adopted quaternary vector and the four differential signals to obtain a constant matrix of 4 rows and 4 columns. Thereafter, an expression corresponding to the above expression (6) is derived from the inverse matrix of the constant matrix. Finally, Fx, Fy, Fz, Mx and Mz are calculated from the actual values of the four adopted differential signals, the expression corresponding to the expression (6), and Fy = Mx ÷ R. .

  According to the modification using the constant matrix of 4 rows and 4 columns, five loads can be calculated from four signals. Therefore, since the sensor only needs to output four signals instead of five signals, the degree of freedom of sensor arrangement and the structure of the displacement detection unit can be greatly increased. Accordingly, the processing of the displacement detection unit can be greatly simplified, and the mounting of the displacement detection unit can be greatly simplified in the case where the displacement detection unit is mounted. Further, the calculation of the signal processing unit as the calculation unit can be greatly simplified.

  Even when five loads are calculated using a constant matrix of 4 rows and 4 columns, instead of (fi + ri + ti + bi− (fo + ro + to + bo)), one of the outputs from one sensor of the first displacement detection unit is used. From the value obtained by subtracting the output of one sensor of the second displacement detector that substantially overlaps the sensor in the axial direction, or the sum of the outputs of three or less sensors of the first displacement detector, the three or less Of course, a value obtained by subtracting the sum of the outputs of the plurality of sensors of the second displacement detector that substantially overlaps the sensor in the axial direction may be used. Needless to say, it is preferable to use (fi + ri + ti + bi− (fo + ro + to + bo)) because the vertical direction and the front-rear direction can be averaged.

  According to the rolling bearing device with a sensor of the fourth embodiment, the coils 381 and 391 formed so as to surround the outer peripheral surface of the first race member over the entire circumference, and the surface of the same substrate as the coils 381 and 392 In addition to the detection of the rotational speed, the set of coils 382 and 392 for detecting the fluctuation of the magnetic field is arranged in two rows in the axial direction. It can detect translational load and moment load.

  In the rolling bearing device with a sensor according to the fourth embodiment, one set of two coils located at both ends is used as a displacement sensor among a set of two coils arranged in three rows in the axial direction. The coil located in the center was used as an ABS sensor.

  However, according to the present invention, the position where the annular grooves 331 and 332 are formed and the position where the rotational speed detector 333 is formed are changed as shown in FIG. On the other hand, a set of two coils positioned at the other end and the center may be used as a displacement sensor.

  In the rolling bearing device with a sensor according to the fourth embodiment, the annular grooves 311 and 312 are formed in the portion facing the fourth coil 382 in the radial direction and the portion facing the sixth coil 392 in the radial direction. In the present invention, however, a non-annular recess (for example, a hole) may be formed in place of the annular groove in the portion facing the fourth coil in the radial direction and the portion facing the sixth coil in the radial direction. good. Further, in the present invention, instead of the annular groove, a region made of a magnetic material having a magnetic permeability different from that of the periphery (in the portion facing the fourth coil in the radial direction and the portion facing the sixth coil in the radial direction) It may be annular in the circumferential direction or may not be annular in the circumferential direction). This is because even in such a configuration, axial displacement can be detected.

  FIG. 14: is sectional drawing of the axial direction of the rolling bearing apparatus with a sensor of 5th Embodiment of this invention.

  The rolling bearing with sensor of the fifth embodiment is a rolling bearing device for wheels for driven wheels, unlike the rolling bearing device with sensors (rolling bearing device for wheels for driving wheels) of the first to fourth embodiments.

  This sensor-equipped rolling bearing device includes an inner shaft 401, an inner ring 402, an outer ring 403 as a second race member, a plurality of first balls 404 as first rolling elements, and a plurality of second balls as second rolling elements. Ball 405, case member 6, and sensor device 410.

  The inner shaft 401 has a small diameter shaft portion 419, a medium diameter shaft portion 420, and a large diameter shaft portion 421. A screw is formed on the outer peripheral surface of the small-diameter shaft portion 419. The medium-diameter shaft portion 420 is connected to the small-diameter shaft portion 419 via a step portion 418 and has an outer diameter larger than the outer diameter of the small-diameter shaft portion 419. The large-diameter shaft portion 421 is located on the opposite side of the medium-diameter shaft portion 420 from the small-diameter shaft portion 419 side. The large-diameter shaft portion 421 is connected to the medium-diameter shaft portion 420 via a step portion 422 and has an outer diameter larger than the outer diameter of the medium-diameter shaft portion 420. The outer peripheral surface of the large-diameter shaft portion 421 has an angular raceway groove as an outer raceway surface, and the outer diameter of the raceway groove increases as the distance from the medium-diameter shaft portion 420 increases.

  The inner shaft 401 has a brake disc mounting flange 450 for mounting a brake disc (not shown) at an end portion on the large-diameter shaft portion 421 side in the axial direction.

  The inner ring 402 is fitted and fixed to the outer peripheral surface of the medium diameter shaft portion 420 of the inner shaft 401. The end surface of the inner ring 402 on the large-diameter shaft portion 421 side in contact with the step 422 is in contact with the step portion 422. The inner ring 402 has an angular raceway groove as an outer raceway surface on the outer peripheral surface on the large-diameter shaft portion 421 side. The outer diameter of the raceway groove increases as the distance from the large-diameter shaft portion 422 increases.

  An end surface of the inner ring 402 on the large-diameter shaft portion 421 side in the axial direction is in contact with the step portion 422. As shown in FIG. 13, the nut 463 is screwed into the screw of the small diameter shaft portion 419. An end surface of the inner ring 402 opposite to the large-diameter shaft portion 421 in the axial direction is in contact with an end surface of the nut 463 on the large-diameter shaft portion 421 side. The inner ring 402 is securely fixed to the inner shaft 401 by screwing the nut 463 into the large-diameter shaft portion 421 side in the axial direction for a predetermined distance.

  The outer ring 403 is located outward in the radial direction of the large-diameter shaft portion 421. The inner circumferential surface of the outer ring 403 has an angular first raceway groove as a first inner circumferential raceway surface and an angular second raceway groove as a second inner circumferential raceway surface. The plurality of first balls 404 are disposed between the raceway groove of the inner ring 402 and the first raceway groove of the outer ring 403 at intervals in the circumferential direction while being held by a cage. The plurality of second balls 405 are disposed between the raceway groove of the inner shaft 401 and the second raceway groove of the outer ring 403 at intervals in the circumferential direction while being held by a cage. ing.

  The case member 406 includes a cylindrical member 452 and a disk-shaped lid member 453. An end portion of the outer peripheral surface of the cylindrical member 452 on the outer ring 403 side is fitted and fixed to an end portion of the inner peripheral surface of the outer ring 403 on the small diameter shaft portion 419 side by an interference fit. On the other hand, the lid member 453 closes the opening of the cylindrical member 452 on the side opposite to the outer ring 403 side. Specifically, the lid member 453 includes a disc portion 480 and a cylindrical portion 481 that is continuous with the disc portion 480, and the inner peripheral surface of the cylindrical portion 481 is opposite to the outer ring 403 side of the cylindrical member 452. It is fixed by being externally fitted to the outer peripheral surface of the end portion by an interference fit. In this way, foreign matter is prevented from entering the inside of the sensor-equipped rolling bearing device. The sensor device 410 is fixed to the case member 406.

  FIG. 15 is an enlarged cross-sectional view of the periphery of the sensor device 410 in FIG.

  The sensor device 410 includes a sensor body 460 and a target member 461. The target member 461 has a cylindrical shape. One end portion of the target member 461 in the axial direction is pressed into an axial end portion 426 on the cylindrical outer peripheral surface of the inner ring 402 by press-fitting. In other words, one end portion of the target member 461 in the axial direction is externally fitted and fixed to the cylindrical outer peripheral surface 426 as one end portion of the outer peripheral surface of the inner ring 402 by an interference fit. In the rolling bearing with sensor of the fifth embodiment, the inner shaft 401, the inner ring 402, and the target member 461 constitute a first race member.

  The sensor body 460 is arranged on a resin-made annular fixing member 498, five rows of substrates fixed at equal intervals in the axial direction on the inner peripheral side of the annular fixing member 498, and on both sides of each substrate. And two sets of planar coils.

  The fixing member 498 is fitted and fixed to the inner peripheral surface of the cylindrical member 452. As shown in FIG. 15, the fixing member 498 and the five substrates are fixed to the cylindrical member 452 with bolts 499 at several places.

  Each of the substrates extends in the radial direction of the cylindrical member 452, and an end surface 488 in the extending direction of each substrate faces the outer peripheral surface of the target member 461.

  The outer peripheral surface of the target member 461 includes annular grooves 494 and 495 extending in the circumferential direction over two rows in the axial direction, and a first portion 496 having a different permeability in a predetermined region in the axial direction. And the second portion has portions arranged alternately in the circumferential direction. The second portion is made of the same material as the portion of the target member 461 other than the predetermined region in the axial direction.

  The sensor device 410 uses the annular grooves 494 and 495, and the first portion 496 and the second portion having different magnetic permeability, which are alternately arranged in the circumferential direction. The load and the rotation speed of the second track member relative to the first track member are detected.

  In the rolling bearing device with a sensor of the fifth embodiment, the sensor device 410 includes a target member 461 fixed to the inner ring 402 and a sensor main body 460 fixed to the cylindrical portion 452. Thus, in the present invention, the sensor device does not need to be fixed to the seal device as in the first to fourth embodiments, and can be fixed to any member.

  In the manufacturing apparatus for the rolling bearing with sensor of the first to fifth embodiments, the rolling element of the rolling bearing with sensor is a ball. However, in this invention, the rolling element of the rolling bearing with sensor is a roller. It may also contain rollers and balls.

  It goes without saying that the sensor-equipped rolling bearing device of the present invention may be any bearing device other than a wheel rolling bearing device such as a magnetic bearing device. It is needless to say that the configuration of the present invention described in the above embodiment can be applied to various bearing devices having a need to measure a plurality of moment loads and translation loads.

It is sectional drawing of the axial direction of the hub unit for drive wheels which is 1st Embodiment of the rolling bearing apparatus with a sensor of this invention. It is an expanded sectional view of the direction of an axis near the pack seal 10 which the rolling bearing device with a sensor of a 1st embodiment has. In 1st Embodiment, it is a schematic diagram which shows the positional relationship of a slinger, a board | substrate, a 1st coil, and a 2nd coil. It is a figure corresponding to FIG. 2 in the rolling bearing device with a sensor of 2nd Embodiment. It is a figure corresponding to FIG. 2 in the rolling bearing device with a sensor of 3rd Embodiment. It is a figure corresponding to FIG. 2 in the rolling bearing device with a sensor of 4th Embodiment. It is a figure explaining the direction used in this specification. It is a figure which shows one experimental example which investigated the relationship between the value of a differential signal, and the force or load which is actually related to a hub unit. It is a figure which shows one experimental example which investigated the relationship between the value of a differential signal, and the force or load which is actually related to a hub unit. It is a figure which shows one experimental example which investigated the relationship between the value of a differential signal, and the force or load which is actually related to a hub unit. It is a figure which shows one experimental example which investigated the relationship between the value of a differential signal, and the force or load which is actually related to a hub unit. It is a figure which shows one experimental example which investigated the relationship between the value of a differential signal, and the force or load which is actually related to a hub unit. It is a figure corresponding to FIG. 2 in the modification of the rolling bearing apparatus with a sensor of 4th Embodiment. It is sectional drawing of the axial direction of the rolling bearing apparatus with a sensor of 5th Embodiment of this invention. It is an expanded sectional view of the periphery of the sensor apparatus in FIG.

Explanation of symbols

1 Hub 2 Inner ring 3 Outer ring 4, 5 ball 10 Pack seal 70 Substrate

Claims (6)

A first track member having a track surface on the outer peripheral surface;
A second race member having a raceway surface on an inner peripheral surface;
A plurality of rolling elements disposed between the raceway surface of the first raceway member and the raceway surface of the second raceway member;
An annular and plate-like first substrate having a through hole through which the first track member passes;
A planar first coil disposed on the first surface on one side of the first substrate so as to surround the first track member over the entire circumference;
A planar second coil disposed on the first surface,
The portion of the first surface surrounded by the second coil is located on the outer side in the radial direction of the first substrate than the through hole,
An annular rotational speed detector extending in the circumferential direction of the first track member is provided at an inner side in the radial direction of the first coil and at a location facing the first coil in the radial direction. Have
The second coil detects a change in the magnetic field generated by the first coil based on the structure of the rotational speed detection unit,
A rolling bearing device with a sensor, comprising: a rotation speed detector that detects a rotation speed of the first track member with respect to the second track member based on a signal output from the second coil. In the rolling bearing device with a sensor according to claim 1,
The first substrate is disposed substantially parallel to the radial direction of the second track member,
An annular and plate-like second substrate having a surface substantially parallel to the first surface of the first substrate and having a through hole through which the first track member passes;
A planar third coil disposed on a surface substantially parallel to the first surface of the second substrate so as to surround the outer peripheral surface of the first track member over the entire circumference;
A planar fourth coil disposed on a surface substantially parallel to the first surface of the second substrate,
The portion of the second substrate surrounded by the fourth coil on a surface substantially parallel to the first surface is located radially outward from the through hole of the second substrate. Rolling bearing device with sensor. In the rolling bearing device with a sensor according to claim 1,
A planar third coil disposed on the second surface on the other side of the first substrate so as to surround the outer peripheral surface of the first track member over the entire circumference;
A planar fourth coil disposed on the second surface,
The rolling bearing device with a sensor is characterized in that a portion of the second surface surrounded by the fourth coil is located radially outward of the first substrate with respect to the through hole. In the rolling bearing device with a sensor according to claim 2,
A planar fifth coil arranged on the second surface on the other side of the first substrate so as to surround the outer peripheral surface of the first track member over the entire circumference;
A planar sixth coil disposed on the second surface,
A portion of the second surface surrounded by the sixth coil is located on the outer side in the radial direction of the first substrate with respect to the through hole of the first substrate. apparatus. In the rolling bearing device with a sensor according to any one of claims 1 to 4,
A seal device for sealing between the first track member and the second track member;
A rolling bearing device with a sensor, wherein the first substrate is fixed to the sealing device. In the rolling bearing device with a sensor according to claim 5,
The sealing device has a metal cored bar part and a rubber elastic part fixed to the cored bar part,
A rolling bearing device with a sensor, wherein the first substrate is fixed to the elastic part.

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