WO2023189278A1 - Dispositif de palier - Google Patents

Dispositif de palier Download PDF

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Publication number
WO2023189278A1
WO2023189278A1 PCT/JP2023/008538 JP2023008538W WO2023189278A1 WO 2023189278 A1 WO2023189278 A1 WO 2023189278A1 JP 2023008538 W JP2023008538 W JP 2023008538W WO 2023189278 A1 WO2023189278 A1 WO 2023189278A1
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WO
WIPO (PCT)
Prior art keywords
ring
outer ring
diameter surface
bearing device
inner ring
Prior art date
Application number
PCT/JP2023/008538
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English (en)
Japanese (ja)
Inventor
孝誌 小池
靖之 福島
Original Assignee
Ntn株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ntn株式会社 filed Critical Ntn株式会社
Publication of WO2023189278A1 publication Critical patent/WO2023189278A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C41/00—Other accessories, e.g. devices integrated in the bearing not relating to the bearing function as such
    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
    • G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link

Definitions

  • the present invention relates to a bearing device.
  • Patent Document 1 JP 2020-148676A (Patent Document 1) describes a bearing with a sensor (bearing device).
  • the bearing device described in Patent Document 1 includes a rolling bearing, an encoder magnet, a cover, and a coil substrate.
  • a rolling bearing has an inner ring, an outer ring, and rolling elements.
  • the direction of the central axis of the inner ring is defined as the axial direction, the direction passing through the central axis and perpendicular to the central axis is defined as the radial direction, and the direction along the circumference centered on the central axis is defined as the circumferential direction.
  • the inner ring has an inner ring outer diameter surface.
  • the inner ring outer diameter surface extends in the circumferential direction.
  • the outer ring has an outer ring inner diameter surface.
  • the inner diameter surface of the outer ring extends in the circumferential direction.
  • the outer ring is arranged on the outside of the inner ring so that the inner diameter surface of the outer ring faces the outer diameter surface of the inner ring with a space therebetween in the radial direction.
  • the rolling elements are arranged between the outer diameter surface of the inner ring and the inner diameter surface of the outer ring.
  • the inner ring is a rotating ring and the outer ring is a stationary ring. That is, the inner ring rotates relative to the outer ring.
  • the encoder magnet has a base material and a magnetic track.
  • the base material is annular and extends in the circumferential direction.
  • a magnetic track is disposed on the major surface of the substrate.
  • the magnetic track has N poles and S poles alternately magnetized in the circumferential direction.
  • the cover is annular and extends in the circumferential direction. The cover is attached to the outer ring so as to face the magnetic track at a distance in the axial direction.
  • the coil board is placed inside the cover.
  • the coil substrate has a partially arcuate shape extending in the circumferential direction.
  • a yoke and a coil pattern are formed on the coil substrate.
  • the yokes are arranged at intervals in the circumferential direction.
  • the coil pattern extends in the circumferential direction so as to meander around the yoke.
  • the coil substrate is attached to the cover so as to face the magnetic track at a distance in the axial direction.
  • power generation is performed by generating induced electromotive force in the coil pattern due to changes in magnetic flux from the magnetic track as the inner ring rotates relative to the outer ring.
  • the coil pattern of the coil substrate is a coil, and the coil patterns formed in multiple layers are connected in parallel or in series, but there is a limit to the number of layers in which the coil patterns can be stacked. Therefore, there is room for improvement in the amount of power generated (generated voltage).
  • the present invention has been made in view of the problems of the prior art as described above. More specifically, the present invention provides a bearing device having a generator that generates a large amount of power.
  • the bearing device of the present invention includes a rolling bearing having an inner ring, an outer ring, and rolling elements, and a generator that generates power as the inner ring rotates relative to the outer ring.
  • the inner ring has an inner ring outer diameter surface.
  • the outer ring has an outer ring inner diameter surface.
  • the outer ring is arranged radially outward of the inner ring such that the inner diameter surface of the outer ring faces the outer diameter surface of the inner ring.
  • the rolling elements are arranged between the outer diameter surface of the inner ring and the inner diameter surface of the outer ring.
  • the generator has a magnetic ring and a stator.
  • the magnetic ring has a multipolar magnet in which north and south poles are alternately magnetized in the circumferential direction, and is attached to one of the inner ring and the outer ring.
  • the stator has an outer ring, a plurality of pins, and a coil.
  • the outer ring has an annular portion extending in the circumferential direction and is attached to the other of the inner ring and the outer ring.
  • the annular portion has an opposing surface that faces the magnetic ring at a distance in the axial direction.
  • the plurality of pins are attached to the annular portion so as to be lined up at intervals in the circumferential direction. Each of the plurality of pins protrudes axially from the opposing surface toward the magnetic ring.
  • the outer ring and the plurality of pins are made of magnetic material. A coil is wound around each of the plurality of pins.
  • the above bearing device includes a sensor, a wireless communication circuit that wirelessly transmits the output of the sensor, a power supply circuit that rectifies the output of the generator to generate power to be supplied to the sensor and the wireless communication circuit, and a circuit board. You may also have more.
  • the sensor, wireless communication circuit, and power supply circuit may be mounted on a circuit board.
  • the circuit board may be placed on the opposing surface avoiding the plurality of pins.
  • a plurality of holes may be formed in the annular portion.
  • Each of the plurality of pins may be attached to the annular portion by being fitted into each of the plurality of holes.
  • the distance in the axial direction between the tip of the pin and the opposing surface may be 10 times or more the distance in the axial direction between the multipolar magnet and the tip of the pin.
  • a plurality of electrical components constituting a sensor, a wireless communication circuit, and a power supply circuit may be mounted on the circuit board.
  • the tip of each of the plurality of pins may be located further away from the opposing surface in the axial direction than any of the plurality of electrical components.
  • the magnetic ring and the outer ring may be attached to the inner ring and the outer ring, respectively.
  • the inner ring may have a first end surface that is an end surface of the inner ring in the axial direction, and an inner diameter surface of the inner ring.
  • At the end of the first end face on the inner diameter surface side of the inner ring there may be a first exposed region that is annular and extends in the circumferential direction and is exposed from the outer ring.
  • the outer ring may have a second end surface that is an end surface of the outer ring in the axial direction, and an outer ring outer diameter surface.
  • a second exposed region may be present at the end of the second end face on the outer diameter surface side of the outer ring, which is annular and extends in the circumferential direction and is exposed from the outer ring.
  • the magnetic ring and the outer ring may be attached to the inner ring and the outer ring, respectively. There may be a gap that is continuous in the circumferential direction between the magnetic ring and the outer ring.
  • the bearing device of the present invention it is possible to increase the amount of power generated by the generator.
  • FIG. 1 is a perspective view of a bearing device 100.
  • FIG. 1 is a front view of a bearing device 100.
  • FIG. 1 is a cross-sectional view of a bearing device 100.
  • FIG. 1 is an exploded perspective view of a bearing device 100.
  • FIG. FIG. 2 is a schematic cross-sectional view of a magnetic ring 30 and a stator 40 in a bearing device 100 developed linearly.
  • FIG. 2 is a perspective view of the bearing device 100 in which the rolling bearing 10 and the magnetic ring 30 are not shown.
  • FIG. 2 is a cross-sectional view showing an example of how the bearing device 100 is used.
  • FIG. 7 is a schematic cross-sectional view of a magnetic ring 30 and a stator 40 in a bearing device 100 according to a modified example, developed in a straight line.
  • the bearing device according to the embodiment is referred to as a bearing device 100.
  • FIG. 1 is a perspective view of the bearing device 100.
  • FIG. 2 is a front view of the bearing device 100.
  • FIG. 3 is a cross-sectional view of the bearing device 100. In FIG. 3, a cross section including the central axis A is shown.
  • FIG. 4 is an exploded perspective view of the bearing device 100.
  • the bearing device 100 includes a rolling bearing 10 and a generator 20.
  • the generator 20 has a magnetic ring 30 and a stator 40.
  • the bearing device 100 may further include a circuit board 50.
  • the rolling bearing 10 has an inner ring 11, an outer ring 12, a plurality of rolling elements 13, a cage 14, and a seal 15.
  • the rolling bearing 10 is, for example, a deep groove ball bearing. However, the rolling bearing 10 is not limited to this.
  • the central axis of the inner ring 11 be the central axis A.
  • the direction of the central axis A is defined as the axial direction.
  • the direction passing through the central axis A and orthogonal to the central axis A is defined as the radial direction.
  • the direction along the circumference centered on the central axis A is defined as the circumferential direction.
  • the inner ring 11 has an end surface 11a, an end surface 11b (first end surface), an inner diameter surface 11c (inner ring inner diameter surface), and an outer diameter surface 11d (inner ring outer diameter surface).
  • the end surface 11a and the end surface 11b are end surfaces of the inner ring 11 in the axial direction.
  • the end surface 11a is located on one side in the axial direction (the left side in FIG. 1).
  • the end surface 11b is a surface opposite to the end surface 11a in the axial direction. That is, the end surface 11b is on the other side in the axial direction (the right side in FIG. 1).
  • the inner diameter surface 11c extends in the circumferential direction.
  • the inner diameter surface 11c faces the central axis A side.
  • One end and the other end in the axial direction of the inner diameter surface 11c are connected to the end surface 11a and the end surface 11b, respectively.
  • the outer diameter surface 11d extends in the circumferential direction.
  • the outer diameter surface 11d faces the opposite side to the central axis A. That is, the outer diameter surface 11d is a surface opposite to the inner diameter surface 11c in the radial direction.
  • One end and the other end in the axial direction of the outer diameter surface 11d are connected to the end surface 11a and the end surface 11b, respectively.
  • the outer diameter surface 11d has a raceway surface 11da.
  • the raceway surface 11da is a portion of the outer diameter surface 11d that contacts the rolling element 13.
  • the raceway surface 11da extends in the circumferential direction.
  • the raceway surface 11da is located at the center of the outer diameter surface 11d in the axial direction. In a cross-sectional view perpendicular to the circumferential direction, the raceway surface 11da has a partially arcuate shape.
  • the outer diameter surface 11d has a groove 11db.
  • the groove 11db is located at the end of the outer diameter surface 11d on the end surface 11b side.
  • the groove 11db extends along the circumferential direction.
  • the outer ring 12 has an end surface 12a, an end surface 12b (second end surface), an inner diameter surface 12c (outer ring inner diameter surface), and an outer diameter surface 12d (outer ring outer diameter surface).
  • End surface 12a and end surface 12b are end surfaces of outer ring 12 in the axial direction.
  • the end surface 12a is located on one side in the axial direction.
  • the end surface 12b is a surface opposite to the end surface 12a in the axial direction. That is, the end surface 12b is on the other side in the axial direction.
  • the inner diameter surface 12c extends in the circumferential direction.
  • the inner diameter surface 12c faces the central axis A side.
  • One end and the other end in the axial direction of the inner diameter surface 12c are connected to the end surface 12a and the end surface 12b, respectively.
  • the outer ring 12 is arranged outside the inner ring 11 so that the inner diameter surface 12c faces the outer diameter surface 11d with a space therebetween.
  • the outer diameter surface 12d extends in the circumferential direction.
  • the outer diameter surface 12d faces the opposite side to the central axis A. That is, the outer diameter surface 12d is a surface opposite to the inner diameter surface 12c in the radial direction.
  • One end and the other end in the axial direction of the outer diameter surface 12d are connected to the end surface 12a and the end surface 12b, respectively.
  • the inner diameter surface 12c has a raceway surface 12ca.
  • the raceway surface 12ca is a portion of the inner diameter surface 12c that contacts the rolling elements 13.
  • the raceway surface 12ca extends in the circumferential direction.
  • the raceway surface 12ca is located at the center of the inner diameter surface 12c in the axial direction. In a cross-sectional view orthogonal to the circumferential direction, the raceway surface 12ca has a partially arcuate shape.
  • the inner diameter surface 12c has a groove 12cb and a groove 12cc.
  • the groove 12cb is located at the end of the inner diameter surface 12c on the end surface 12a side.
  • the groove 12cb extends in the circumferential direction.
  • the groove 12cb is located between the raceway surface 12ca and the end surface 12a in the axial direction.
  • the groove 12cc is located at the end of the inner diameter surface 12c on the end surface 12b side.
  • the groove 12cc extends in the circumferential direction.
  • the rolling elements 13 are spherical.
  • the rolling element 13 is arranged between the outer diameter surface 11d and the inner diameter surface 12c. More specifically, the rolling elements 13 are arranged between the raceway surface 11da and the raceway surface 12ca.
  • the plurality of rolling elements 13 are arranged at intervals in the circumferential direction.
  • the retainer 14 is arranged between the outer diameter surface 11d and the inner diameter surface 12c.
  • the cage 14 holds a plurality of rolling elements 13 such that the distance between two adjacent rolling elements 13 is within a certain range.
  • the portions of the cage 14 that hold the rolling elements 13 are connected on the other side in the axial direction, and are open on one side in the axial direction.
  • the seal 15 is annular and extends in the circumferential direction.
  • the outer peripheral edge of the seal 15 is inserted into the groove 12cb.
  • the inner peripheral edge of the seal 15 is in contact with a seal groove 11dc formed in the outer diameter surface 11d.
  • the inner peripheral edge of the seal 15 may face the seal groove 11dc with a space therebetween.
  • the space between the outer diameter surface 11d and the inner diameter surface 12c is referred to as a bearing space.
  • One side of the bearing space in the axial direction is closed by a seal 15 .
  • a lubricant is sealed in the bearing space.
  • the magnetic ring 30 has a core metal 31 and a multipolar magnet 32.
  • the core metal 31 has a cylindrical portion 31a and an annular portion 31b.
  • the cylindrical portion 31a has a cylindrical shape extending in the axial direction.
  • the cylindrical portion 31a is fitted into the groove 11db on the inner diameter surface.
  • the core metal 31 is attached to the inner ring 11.
  • the annular portion 31b is annular and extends in the circumferential direction.
  • the annular portion 31b projects radially outward from one end of the cylindrical portion 31a in the axial direction.
  • the multipolar magnet 32 is arranged on the surface of the annular portion 31b facing the other side in the axial direction.
  • the multipolar magnet 32 is made of, for example, rubber mixed with magnetic powder.
  • the multipolar magnet 32 is vulcanized and bonded to the annular portion 31b.
  • the multipolar magnet 32 is magnetized with N poles and S poles alternately in the circumferential direction.
  • the stator 40 has an outer ring 41, a plurality of pins 42, a bobbin 43, and a coil 44.
  • the outer ring 41 is made of a magnetic material.
  • the outer ring 41 is made of, for example, silicon steel, carbon steel, martensitic stainless steel, ferritic stainless steel, or the like.
  • the outer ring 41 has an annular portion 41a, a cylindrical portion 41b, and a cylindrical portion 41c.
  • the annular portion 41a is annular and extends in the circumferential direction.
  • the cylindrical portion 41b has a cylindrical shape extending from the radially inner end of the annular portion 41a to one side in the axial direction.
  • the cylindrical portion 41b faces the magnetic ring 30 in the axial direction. It is preferable that there is a gap between the cylindrical portion 41b and the magnetic ring 30. This gap is continuous in the circumferential direction.
  • the cylindrical portion 41b may face the end surface 11b. In this case, a gap that is continuous in the circumferential direction exists between the cylindrical portion 41b and the end surface 11b. These gaps are, for example, 1 mm or less.
  • the cylindrical portion 41c has a cylindrical shape extending from the radially outer end of the annular portion 41a to one side in the axial direction.
  • the cylindrical portion 41c is fitted into the groove 12cc on the outer diameter surface. Thereby, the outer ring 41 (stator 40) is attached to the outer ring 12.
  • the annular portion 41a has a first surface 41aa (opposing surface) and a second surface 41ab.
  • the first surface 41aa and the second surface 41ab are end surfaces of the annular portion 41a in the axial direction.
  • the first surface 41aa faces one side in the axial direction.
  • the first surface 41aa faces the magnetic ring 30 (multipolar magnet 32) with an interval in the axial direction.
  • the second surface 41ab faces the other side in the axial direction. That is, the second surface 41ab is a surface opposite to the first surface 41aa in the axial direction.
  • a plurality of holes 41ac are formed in the annular portion 41a.
  • the hole 41ac penetrates the annular portion 41a along the thickness direction (that is, the axial direction).
  • the plurality of holes 41ac are arranged at intervals in the circumferential direction. Note that the hole 41ac does not need to pass through the annular portion 41a as long as it is possible to fit a pin 42, which will be described later.
  • the outer diameter of the outer ring 41 (the outer diameter of the cylindrical portion 41c) is preferably smaller than the outer diameter of the outer ring 12. Further, the inner diameter of the outer ring 41 (the inner diameter of the cylindrical portion 41b) is preferably larger than the inner diameter of the inner ring 11. Therefore, at the end of the end surface 11b on the inner diameter surface 11c side, there is an annular region (first exposed region) extending in the circumferential direction and exposed from the outer ring 41, and the end surface 12b At the end of the outer ring 41 on the outer diameter surface 12d side, there is a region (second exposed region) that is annular and extends in the circumferential direction and is exposed from the outer ring 41.
  • the pin 42 is made of magnetic material.
  • the pin 42 is made of, for example, silicon steel, carbon steel, martensitic stainless steel, ferritic stainless steel, or the like.
  • the pin 42 may be made of the same material as the outer ring 41, or may be made of a different material from the outer ring 41.
  • the pin 42 has a cylindrical shape, for example.
  • the pin 42 may have a prismatic shape.
  • the pitch between two adjacent pins 42 is, for example, equal to the pitch between two adjacent magnetic poles of the multipolar magnet 32.
  • the pins 42 are attached to the annular portion 41a so as to be lined up at intervals in the circumferential direction.
  • the pin 42 is preferably attached to the annular portion 41a by being fitted into the hole 41ac.
  • the pin 42 may be attached to the annular portion 41a by press fitting, adhesion, laser welding, or a combination thereof.
  • the pin 42 protrudes in the axial direction from the first surface 41aa toward the magnetic ring 30 (multipolar magnet 32).
  • the tip of the pin 42 is spaced apart from the magnetic ring 30 (multipolar magnet 32) in the axial direction.
  • a bobbin 43 is passed through the pin 42.
  • a coil 44 is wound around the outer circumferential groove of the bobbin 43.
  • the coil 44 may be directly wound around the pin 42 without using the bobbin 43.
  • the coil 44 wraps around the pin 42 multiple times.
  • the winding direction of the coil 44 around one pin 42 is opposite to the winding direction of the coil 44 around another pin 42 that is circumferentially adjacent to the one pin 42 .
  • the coils 44 wound around each of the plurality of pins 42 are connected in series or in parallel.
  • the distance in the axial direction between the tip of the pin 42 and the first surface 41aa is defined as a first distance.
  • the distance in the axial direction between the tip of the pin 42 and the multipolar magnet 32 is defined as a second distance.
  • the first distance is 10 times or more the second distance.
  • FIG. 5 is a schematic cross-sectional view of the magnetic ring 30 and stator 40 in the bearing device 100 developed in a straight line.
  • the magnetic flux (see the arrow in FIG. 5) emitted from the N pole of the multipolar magnet 32 enters the outer ring 41 (annular portion 41a) from one pin 42, and enters the outer ring 41 (annular portion 41a) from one pin 42. 42 and another pin 42 adjacent in the circumferential direction, and returns to the S pole of the multipolar magnet 32.
  • the magnetic ring 30 rotates, the positions of the N and S poles of the multipolar magnet 32 are switched, so that the direction of the magnetic flux is reversed. Due to the alternating magnetic field generated in this way, an alternating current voltage is generated between both ends of the coil 44.
  • the circuit board 50 is placed on the first surface 41aa.
  • the circuit board 50 is arranged avoiding the plurality of pins 42.
  • the circuit board 50 is located at a position where it does not overlap with the plurality of pins 42 when viewed along the axial direction.
  • An insulating sheet (not shown) may be placed between the circuit board 50 and the first surface 41aa.
  • the circuit board 50 is attached to the annular portion 41a using, for example, screws, adhesive, or the like.
  • FIG. 6 is a perspective view of the bearing device 100 in which the rolling bearing 10 and the magnetic ring 30 are not shown.
  • the circuit board 50 has a terminal 50a and a terminal 50b. One end and the other end of the coil 44 are connected to the terminal 50a and the terminal 50b, respectively.
  • a power supply circuit 51, a sensor 52, and a wireless communication circuit 53 are mounted on the circuit board 50.
  • the power supply circuit 51 is connected to the terminals 50a and 50b by wiring (not shown) formed on the circuit board 50.
  • the output (alternating current) of the generator 20 (coil 44) is rectified in the power supply circuit 51 to become direct current power.
  • the power supply circuit 51 is connected to the sensor 52 and the wireless communication circuit 53 through wiring (not shown) formed on the circuit board 50. As a result, the above DC power is supplied to the sensor 52 and the wireless communication circuit 53, and the sensor 52 and the wireless communication circuit 53 are driven.
  • the sensor 52 monitors the state of the rolling bearing 10.
  • the number of sensors 52 is, for example, plural.
  • the sensors 52 are an acceleration sensor 52a and a temperature sensor 52b.
  • the sensors 52 (acceleration sensor 52a, temperature sensor 52b) are connected to a wireless communication circuit 53 through wiring (not shown) formed on the circuit board 50.
  • the output of the sensor 52 (acceleration sensor 52a, temperature sensor 52b) is transmitted to the wireless communication circuit 53.
  • Wireless communication circuit 53 wirelessly transmits the output from sensor 52 from an antenna (not shown).
  • the tip of the pin 42 is located further away from the first surface 41aa than any of the electrical components constituting the power supply circuit 51, the sensor 52, and the wireless communication circuit 53. To put this from another perspective, the height of the pin 42 is greater than the maximum height of the electrical components that constitute the power supply circuit 51, the sensor 52, and the wireless communication circuit 53.
  • a resin material or the like may be applied to the surface of the circuit board 50 in order to protect the surface.
  • the inner space of the outer ring 41 may be filled with a sealing material made of a resin material. Note that the filling height of this sealing material is up to the height of the cylindrical portion 41b.
  • FIG. 7 is a cross-sectional view showing an example of how the bearing device 100 is used.
  • a cross section including the central axis A is shown in FIG.
  • the shaft 110 has an end 110a.
  • the end portion 110a is the end portion of the shaft 110 on the other side in the axial direction (the right side in FIG. 7).
  • the outer diameter of the end portion 110a is smaller than the outer diameter of the portion of the shaft 110 that is continuous with the end portion 110a. That is, a step is formed on the outer diameter surface of the shaft 110 between the end portion 110a and the portion of the shaft 110 that is continuous with the end portion 110a.
  • the inner diameter surface 11c is fitted to the outer diameter surface of the end portion 110a so that the end surface 11a contacts this step.
  • a nut 111 and a spacer 112 are attached to the end portion 110a.
  • the nut 111 is screwed onto the end portion 110a.
  • the spacer 112 is disposed between the nut 111 and the inner ring 11, and is in contact with the first exposed region of the end surface 11b. Thereby, the inner ring 11 is attached to the shaft 110.
  • the housing 120 has an end 120a.
  • the end 120a is the end of the housing 120 on the other side in the axial direction.
  • the inner diameter of the end portion 120a is larger than the inner diameter of the portion of the housing 120 that is continuous with the end portion 120a. That is, a step is formed on the inner diameter surface of the housing 120 between the end portion 120a and the portion of the housing 120 that is continuous with the end portion 120a.
  • the outer diameter surface 12d is fitted to the inner diameter surface of the end portion 120a so that the end surface 12a contacts this step.
  • a lid 121 is attached to the other end of the housing 120 in the axial direction. The lid 121 is in contact with the second exposed region of the end surface 12b. Thereby, the outer ring 12 is attached to the housing 120.
  • the outer ring 41 not only attaches the stator 40 to the rolling bearing 10 but also functions as part of the yoke of the stator 40. Therefore, in the bearing device 100, a separate part for fixing the stator 40 is not required, and the number of parts and size can be reduced.
  • the pin 42 is attached to the annular portion 41a by fitting into the hole 41ac, positioning for attaching the pin 42 is facilitated. Moreover, since a jig for attaching the pin 42 is not required, the efficiency of the work for attaching the pin 42 is also improved.
  • the bearing device 100 since the first distance is 10 times or more the second distance, the magnetic flux from the multipolar magnet 32 is less likely to leak to the first surface 41aa. Therefore, according to the bearing device 100, leakage magnetic flux is reduced, and the generated voltage of the generator 20 can be increased. As a result, it is possible to stably drive the circuit board 50 (power supply circuit 51, sensor 52, wireless communication circuit 53) even in a low-speed rotation region where the rotation speed of the inner ring 11 is low.
  • the tip of the pin 42 is located further from the first surface 41aa than any of the electrical components constituting the power supply circuit 51, the sensor 52, and the wireless communication circuit 53, the magnetic ring 30 and the electrical component Contact with parts is avoided.
  • the inner ring 11 can be attached to the shaft 110 by the nut 111 and the spacer 112 using the first exposed area of the end face 11b, and the outer ring 12 can be attached to the housing by the lid 121 using the second exposed area of the end face 12b.
  • the bearing device 100 can be used without changing the structure of the shaft 110 and housing 120. Further, since the bearing device 100 is attached to the shaft 110 and the housing 120 as described above, the attachment in the axial direction can be performed compactly.
  • the radio waves from the antenna of the wireless communication circuit 53 are transmitted to the outside through the gap. It is possible to release
  • FIG. 8 is a schematic cross-sectional view of the magnetic ring 30 and the stator 40 in a bearing device 100 according to a modified example, developed in a straight line.
  • the pitch between two adjacent pins 42 may be larger than the pitch between two adjacent magnetic poles of the multipolar magnet 32. This makes it possible to cope with an increase in the number of magnetic poles magnetized on the multipolar magnet 32.
  • a hole 41ad (not shown) may be formed in the annular portion 41a.
  • the hole 41ad is located at a position facing the antenna of the wireless communication circuit 53. Thereby, it is possible to emit radio waves from the antenna of the wireless communication circuit 53 to the outside from the hole 41ad.
  • the hole 41ad may be plugged with a non-metallic material (for example, a resin material).
  • the gap between the cylindrical part 41b and the magnetic ring 30 (or between the cylindrical part 41b and the end surface 11b) has a labyrinth seal structure, and can prevent foreign matter from entering the inside of the generator 20.
  • the gap between the cylindrical part 41b and the magnetic ring 30 (or between the cylindrical part 41b and the end surface 11b) is made of rubber material. It may be sealed by etc.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Rolling Contact Bearings (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Sealing Of Bearings (AREA)

Abstract

L'invention concerne un dispositif de palier (100) comprenant: un palier à roulement (10) ayant une bague intérieure (11), une bague extérieure (12) et un corps de roulement (13); et un générateur (20) qui génère de l'électricité conjointement avec la rotation de la bague intérieure par rapport à la bague extérieure. La bague intérieure présente une surface diamétrale extérieure de bague intérieure (11d). La bague extérieure présente une surface diamétrale intérieure de bague extérieure (12c). La bague extérieure est disposée sur l'extérieur de la bague intérieure dans une direction radiale de sorte que la surface diamétrale intérieure de bague extérieure fait face à la surface diamétrale extérieurede bague intérieure. Le corps de roulement est disposé entre la surface diamétrale extérieure de bague intérieure et la surface diamétrale intérieure de bague extérieure. Le générateur comporte un anneau magnétique (30), et un stator (40). L'anneau magnétique a un aimant multipolaire (32) magnétisé pour avoir des pôles N et des pôles S en alternance dans une direction circonférentielle, et est fixé à une parmi la bague intérieure et de la bague extérieure.
PCT/JP2023/008538 2022-03-30 2023-03-07 Dispositif de palier WO2023189278A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022055791A JP2023147978A (ja) 2022-03-30 2022-03-30 軸受装置
JP2022-055791 2022-03-30

Publications (1)

Publication Number Publication Date
WO2023189278A1 true WO2023189278A1 (fr) 2023-10-05

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Application Number Title Priority Date Filing Date
PCT/JP2023/008538 WO2023189278A1 (fr) 2022-03-30 2023-03-07 Dispositif de palier

Country Status (2)

Country Link
JP (1) JP2023147978A (fr)
WO (1) WO2023189278A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003269474A (ja) * 2002-03-14 2003-09-25 Ntn Corp 発電機能付軸受
WO2011042410A1 (fr) * 2009-10-09 2011-04-14 Schaeffler Technologies Gmbh & Co. Kg Palier à roulement doté d'une machine électrique à excitation permanente intégrée
WO2017171067A1 (fr) * 2016-04-01 2017-10-05 日本精工株式会社 Palier équipé d'un capteur sans fil

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003269474A (ja) * 2002-03-14 2003-09-25 Ntn Corp 発電機能付軸受
WO2011042410A1 (fr) * 2009-10-09 2011-04-14 Schaeffler Technologies Gmbh & Co. Kg Palier à roulement doté d'une machine électrique à excitation permanente intégrée
WO2017171067A1 (fr) * 2016-04-01 2017-10-05 日本精工株式会社 Palier équipé d'un capteur sans fil

Also Published As

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JP2023147978A (ja) 2023-10-13

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