JP2009144858A - Rolling bearing device with sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact rolling bearing device with a sensor having the sensor for detecting a physical quantity such as displacement and a rotating speed. <P>SOLUTION: A first coil 91 is arranged in a first part 81 of a substrate 90 having the annular and plate-like first part 81 having a through-hole 89 for penetrating a target member and a plate-like second part 82 intersecting with this first part 81 so as to surround the through-hole 89 over the whole periphery. A planar second coil 92 is also arranged in the second part 82. The respective first part 81 and second part 82 are composed of a polyimide resin, and the first coil 91 is arranged inside the first part 81, and the second coil 92 is arranged inside the second part 82. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

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

  Conventionally, as a rolling bearing device with a sensor, there is a rolling bearing device for a wheel 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 such a background, since the inductance type displacement sensor has a large arrangement space, there is a problem that it is difficult to reduce the size of the wheel rolling bearing device.
JP 2007-127253 A

  Therefore, an object of the present invention is to provide a compact rolling bearing device with a sensor, which has a sensor for detecting a physical quantity (displacement, rotational speed, etc.).

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;
A substrate having an annular and flat plate-like first portion having a through-hole through which the first track member passes, and a flat plate-like second portion intersecting the first portion;
A planar first coil disposed in the first portion and disposed to surround the first track member over the entire circumference;
And a planar second coil disposed in the second portion.

  The said 1st track member shall consist of a member which has a track surface in the said outer peripheral surface, and all the members fixed to this member so that a movement is impossible.

  According to the present invention, since the first portion where the planar first coil is disposed and the second portion where the planar second coil is disposed intersect, the first coil and the second coil Compared with the case where are formed in the same plate-like part, the dimension of the plate-like part in which the 1st coil is formed can be made small.

  Therefore, in each specification, by appropriately setting the angle of intersection between the first portion and the second portion and appropriately arranging the substrate, the sensor device includes the substrate, the first coil, and the first coil. The part consisting of two coils can be arranged in a small space, and the compact rolling bearing device with sensor can be realized.

In one embodiment,
Each of the first part and the second part is made of resin. The first coil is arranged inside the first part, and the second coil is arranged inside the second part. Yes.

  According to the embodiment, since the first coil is disposed inside the first part and the second coil is disposed inside the second part, the first and second coils are provided. Can be reliably insulated. Further, it is possible to prevent noise due to contact between the coil and a foreign substance such as dust. Therefore, the physical quantity to be detected can be detected more accurately.

  According to the rolling bearing device with a sensor of the present invention, the first portion where the planar first coil is disposed and the second portion where the planar second coil is disposed intersect each other. Compared with the case where the 1 coil and the 2nd coil are formed in the same plate-shaped part, the dimension of the plate-shaped part in which the 1st coil is formed can be made small.

  Therefore, in each specification, by appropriately setting the angle of intersection between the first portion and the second portion and appropriately arranging the substrate, the sensor device includes the substrate, the first coil, and the first coil. The part consisting of two coils can be arranged in a small space, and the compact rolling bearing device with sensor can be realized.

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

  FIG. 1 is a cross-sectional view in the axial direction of a vehicle rolling bearing device for a driven wheel (a hub unit for a driven wheel) which is a rolling bearing device with a sensor according to an embodiment of the present invention.

  This sensor-equipped rolling bearing device includes an inner shaft 1, an inner ring 2, an outer ring 3 as a second race member, a cap member 5, a plurality of balls 7 as an example of a rolling element, nuts 8, and a sensor device. 10.

  The inner shaft 1 has a small diameter shaft portion 19, a medium diameter shaft portion 20, and a large diameter shaft portion 21. A screw is formed on the outer peripheral surface of the small diameter shaft portion 19. The medium-diameter shaft portion 20 is connected to the small-diameter shaft portion 19 via the step portion 30 and has an outer diameter larger than the outer diameter of the small-diameter shaft portion 19. The large-diameter shaft portion 21 is located on the opposite side of the medium-diameter shaft portion 20 from the small-diameter shaft portion 19 side. The large-diameter shaft portion 21 is connected to the medium-diameter shaft portion 20 via a step portion 22 and has an outer diameter larger than the outer diameter of the medium-diameter shaft portion 20. The outer circumferential surface of the large-diameter shaft portion 21 has an angular raceway groove as an outer raceway surface (not shown) on the right side of the paper. The outer diameter of the raceway groove increases as the distance from the middle-diameter shaft portion 20 increases. It has become.

  The inner shaft 1 has a brake disk mounting flange for mounting a brake disk at an end (on the right side of the drawing, not shown) on the large-diameter shaft portion 21 side in the axial direction.

  The inner ring 2 is fitted and fixed to the outer peripheral surface of the medium-diameter shaft portion 20 of the inner shaft 1. The end surface of the inner ring 2 on the large diameter shaft portion 21 side in the axial direction is in contact with the stepped portion 22. The inner ring 2 has an angular raceway groove 27 as an outer raceway surface on the outer diameter side of the large-diameter shaft portion 21. The outer diameter of the raceway groove 27 increases as the distance from the large diameter shaft portion 22 increases.

  The end surface of the inner ring 2 on the large diameter shaft portion 21 side in the axial direction is in contact with the step portion 22. The nut 8 is screwed into the screw of the small diameter shaft portion 19. The end surface of the inner ring 2 opposite to the large-diameter shaft portion 21 in the axial direction is in contact with the end surface of the nut 8 on the large-diameter shaft portion 21 side in the axial direction. The inner ring 2 is securely fixed to the inner shaft 1 by screwing the nut 8 into the large-diameter shaft portion 21 side in the axial direction for a predetermined distance.

  The outer ring 3 is located outward in the radial direction of the large-diameter shaft portion 21. The outer circumferential surface of the outer ring 3 includes an angular first raceway groove 28 as a first inner raceway surface and an angular second raceway groove as a second inner raceway surface (on the right side of the page). , Not shown). The plurality of balls 7 are arranged at intervals in the circumferential direction between the raceway groove 27 of the inner ring 2 and the first raceway groove 28 of the outer ring 3 while being held by a cage 29. . Although not shown, a plurality of balls other than the balls 7 are held by a cage between the track groove of the inner shaft 1 and the second track groove of the outer ring 3 on the right side of the page. Thus, they are arranged at intervals in the circumferential direction.

  The cap member 5 covers the end of the inner shaft 1 opposite to the wheel connection side in the axial direction. The cap member 5 includes an annular first member 51 and an annular second member 52. The first member 51 includes a small-diameter cylindrical portion 60, a radial extending portion 61, and a large-diameter cylindrical portion 62, and the small-diameter cylindrical portion 60 is interposed via the radial extending portion 61. It is connected to the. The small-diameter cylindrical portion 60 is fitted and fixed to the inner peripheral surface of the end portion on the opposite side to the wheel connection side in the axial direction of the outer ring 3. The radially extending portion 61 is in contact with the axial end surface of the end portion of the outer ring 3, and the large diameter cylindrical portion 62 is axially extended from the outer diameter side end portion of the radially extending portion 61. It extends to the opposite side of the wheel connection side.

  The second member 52 includes a large-diameter cylindrical portion 71, a small-diameter cylindrical portion 72 having a smaller diameter than the large-diameter cylindrical portion, a first radial extending portion 73, and a second radial extending portion 74. The large diameter cylindrical portion 71 is fitted and fixed to the inner peripheral surface of the large diameter cylindrical portion 62 of the first member 51. The first and second radial extending portions 73 and 74 extend in the radial direction. The large-diameter cylindrical portion 71 is connected to the small-diameter cylindrical portion 72 via a first radial extending portion 73. The second radially extending portion 74 is connected to the first radially extending portion 73 via the small diameter cylindrical portion 72. The second radially extending portion 74 is located radially inward of the first radially extending portion 71, and the large diameter cylindrical portion 71 is closer to the wheel connection side in the axial direction than the small diameter cylindrical portion 72. positioned.

  The sensor device 10 includes a sensor main body 50 and a target member 51 made of a magnetic material. The sensor main body 50 includes a substrate 80 made of polyimide resin, a first coil, and a second coil. In addition, the substrate 80 has a first portion 81 that is annular and flat, a second portion 82 that is flat, and a third portion 83 that is plate-like.

  As shown in FIG. 1, the first portion 81 is fixed to the end surface of the first radially extending portion 73 on the ball 7 side. The second portion 82 is connected to the first portion 81 through a bending portion. The second portion 82 is fixed to the inner peripheral surface of the large-diameter cylindrical portion 71 of the second member 52 of the cap member 5. The third portion 83 is connected to the axial end of the second portion 82 opposite to the first portion 81 side.

  Each of the first coil and the second coil has a planar shape. The first coil is disposed inside the first portion 81, and the second coil is disposed inside the second portion 82. The extending direction of the first coil substantially coincides with the extending direction of the first portion 81, and the extending direction of the second coil substantially coincides with the extending direction of the second portion 82. As shown in FIG. 1, the first portion 81 and the second portion 82 intersect at an angle of approximately 90 degrees.

  The target member 51 has a substantially cylindrical shape. One end of the target member 51 in the axial direction is pressed into the end of the cylindrical outer peripheral surface of the inner ring 2 on the axial nut 8 side by press-fitting. One end portion of the target member 51 in the axial direction is fixed by being fitted onto a cylindrical outer peripheral surface 58 as one end portion of the outer peripheral surface of the inner ring 2 by an interference fit.

  In this specification, the first track member is composed of members having track surfaces on the outer periphery, that is, the inner shaft 1 and the inner ring 2 and all members fixed to the inner shaft 1 and the inner ring 2 so as not to move. Each of the inner shaft 1, the inner ring 2, and the target member 51 constitutes a part of the first track member.

  FIG. 2 is a schematic diagram showing the periphery of the first and second portions 81 and 82 of the sensor main body 50. The first portion 81 and the second portion 82 are substantially orthogonal as is apparent from FIG. 1, but are not orthogonal in FIG. 2 for the sake of convenience in order to make the structure of the coil 91 easier to understand. It is drawn as follows.

  As shown in FIG. 2, the first portion 81 is annular and has a through hole 89. The planar first coil 91 is disposed in the first portion 81 and is disposed so as to surround the through-hole 89 (target member 51 (see FIG. 1)) over the entire circumference. The planar second coil 92 is spirally arranged in the second portion 82.

  As shown in FIG. 2, there are four second coils 92, and the four second coils 92 are arranged at equal intervals in the circumferential direction. An oscillator (drive circuit) (not shown) is connected to the first coil 71 via the cable 93.

  For example, a high-frequency current from 100 KHz to 10 MHz is generated by the oscillator, and this high-frequency current flows into the first coil 91 via the cable 93.

  Since the target member 51 is made of a magnetic material, the magnetic flux generated by the first coil 91 passes through the target member 51. Therefore, when a load acts on the target member 51 and the target member 51 approaches a certain second coil 92, induction generated in the second coil 92 based on a high-frequency magnetic field generated by the first coil 91. While the electromotive force increases, when a load acts on the target member 51 and the target member 51 moves away from a certain second coil 92, the second coil 92 is applied to the second coil 92 based on the high-frequency magnetic field generated by the first coil 91. The induced electromotive force generated is reduced.

  Accordingly, when the target member 51 is formed of the same magnetic material as in this embodiment, if the induced electromotive force generated by each second coil 92 is measured, each second coil 92 and target The distance to the member 51 can be measured.

  Further, for example, the portion of the target member that faces the first coil in the radial direction is formed of two portions (a first portion and a second portion) that are alternately positioned in the circumferential direction and have different magnetic permeability. Or when the irregularities are repeated in a gear shape in the circumferential direction, the induced electromotive force generated by the second coil is the relative rotational speed of the slinger with respect to the substrate (the second track member with respect to the first track member). The relative electromotive force of the second raceway member relative to the first raceway member can be detected by detecting the period.

  According to the rolling bearing device with sensor of the above embodiment, the first portion 81 where the planar first coil 91 is arranged and the second portion 92 where the planar second coil 92 is arranged intersect each other. Therefore, compared with the case where the 1st coil and the 2nd coil are formed in the same plate-shaped part, the size of the extension direction of the 1st part 81 in which the 1st coil is formed is made small. Can do.

  Therefore, in this embodiment, since the first portion 81 extends in the radial direction of the outer ring 3 and the radial dimension of the sensor body 50 can be reduced, the radial dimension of the sensor arrangement space is small, or Even when the radial dimension of the sensor arrangement space is reduced, the sensor main body can be easily arranged. Therefore, it is possible to realize a compact rolling bearing device with a sensor.

  Moreover, according to the rolling bearing device with a sensor of the said embodiment, each of the said 1st part 81 and the 2nd part 82 consists of resin, the 1st coil 91 is arrange | positioned inside the 1st part 81, and Since the second coil 92 is disposed inside the second portion 82, the first and second coils 91 and 92 can be reliably insulated. Further, since it is possible to prevent noise due to contact between the coils 91 and 92 and foreign matter such as dust, the physical quantity to be detected can be detected more accurately.

  In the rolling bearing device with sensor of the above embodiment, the third portion is provided on the side opposite to the first portion of the second portion. However, in the present invention, as shown in the schematic diagram of FIG. The third portion may not exist on the opposite side of the 180 second portion 182 from the first portion 181. In FIG. 3, reference numeral 193 denotes a signal line for supplying a high-frequency current to the first coil.

  Moreover, in the rolling bearing device with a sensor of the said embodiment, the four 2nd coils 92 existed, However, In this invention, the natural number other than 4 may exist for the 2nd coil.

  Moreover, in the rolling bearing device with a sensor of the above embodiment, the polyimide resin substrate 80 is used. However, in the present invention, if the resin has insulation and flexibility such as bending, Any resin can be used as the substrate material.

  In the rolling bearing device with a sensor of the above embodiment, the first portion 81 and the first portion 82 intersect with each other at an angle of about 90 °. However, in the present invention, the first portion and the first portion The two portions may intersect at any angle within an angle range greater than 0 ° and less than 180 °, and the intersecting angle may not be approximately 90 ° as in the above embodiment.

  Further, in the rolling bearing device with a sensor according to the above embodiment, the sensor device 10 detects the displacement. However, in the present invention, the portion of the target member made of a magnetic material that faces the first coil in the radial direction It may be formed by two portions (first portion and second portion) that are alternately located in the direction and have different magnetic permeability, or may have a configuration in which unevenness is repeated in a gear shape in the circumferential direction. .

  In this case, the induced electromotive force generated by the second coil becomes an induced electromotive force having periodicity that depends on the relative rotation speed of the slinger with respect to the substrate (the relative rotation speed of the second track member with respect to the first track member). By detecting this period, the rotational speed of the second track member relative to the first track member can be detected.

  In the above embodiment, the sensor-equipped rolling bearing device is a hub unit. However, the sensor-equipped rolling bearing device is not limited to the hub unit, and any bearing device other than the hub unit such as a magnetic bearing device, for example. It may be. 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.

  Moreover, in the rolling bearing with a sensor of the said embodiment, although the rolling element of the rolling bearing with a sensor manufactured was a ball, in this invention, even if the rolling element of the rolling bearing with a sensor manufactured is a roller, It may also contain rollers and balls.

It is sectional drawing of the axial direction of the rolling bearing device for vehicles for driven wheels (hub unit for driven wheels) which is a rolling bearing device with a sensor of one embodiment of the present invention. It is a schematic diagram which shows the periphery of the 1st and 2nd part of a sensor main body. It is a schematic diagram which shows the modification of a sensor main body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inner shaft 2 Inner ring 3 Outer ring 7 Ball 10 Sensor apparatus 80 Board | substrate 81 1st part 82 2nd part 89 Through-hole 91 1st coil 92 2nd coil

Claims (2)

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;
A substrate having an annular and flat plate-like first portion having a through-hole through which the first track member passes, and a flat plate-like second portion intersecting the first portion;
A planar first coil disposed in the first portion and disposed to surround the first track member over the entire circumference;
A rolling bearing device with a sensor, comprising: a planar second coil disposed in the second portion. In the rolling bearing device with a sensor according to claim 1,
Each of the first part and the second part is made of resin. The first coil is arranged inside the first part, and the second coil is arranged inside the second part. A rolling bearing device with a sensor characterized by comprising:

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