JP2023047504A - Bearing device and maintenance method of bearing device - Google Patents

Abstract

To provide a bearing device capable of easily replacing with another component when the bearing is damaged and replacement is needed while suppressing machining to the bearing device to the minimum, and a maintenance method of the bearing device.SOLUTION: A bearing device 1 includes: an outer ring (fixing member) 7 fixed to an outer lace 2; a magnetic ring (rotor) 8 fixed to an inner lace 3; and a circuit board 10 that is mounted on the outer ring (fixing member) 7 and transmits information regarding the state of the bearing B to the outside. The magnetic ring (rotor) 8 and a stator 9 constitute a claw pole type generator. An engagement section 21 for being engaged with a fixture is formed on the outer ring (fixing member) 7.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present disclosure relates to a bearing device and a method for maintaining the bearing device.

2. Description of the Related Art In a bearing device (bearing with wireless sensor) in which a generator, a sensor, and a wireless communication function are mounted on a bearing, there is known a sensor mounting structure that eliminates the need to replace the entire bearing when replacing the sensor.

The mounting structure disclosed in Japanese Patent Application Laid-Open No. 2017-48846 (Patent Document 1) is a structure in which a sensor for detecting state quantities around the bearing is mounted on a rolling bearing having an inner ring, an outer ring, and rolling elements. be. In Patent Document 1, a bearing inner ring side female threaded portion and a bearing outer ring side male threaded portion are formed as bearing side threaded portions coaxial with the bearing axis on the outer peripheral surface of at least one of the inner ring and the outer ring or on the end portion of the inner peripheral surface in the axial direction of the bearing. do. In Patent Document 1, a tone-ring-side male screw portion and a cover-side female screw portion are formed as sensor-side screw portions to be screwed to the bearing-side screw portions, and the bearing-side screw portion and the sensor-side screw portion are screwed together. and install the sensor on the rolling bearing. Patent Literature 1 discloses that when a sensor is replaced, the threaded portion on the bearing side and the threaded portion on the sensor side are disengaged from each other.

JP 2017-48846 A

If the mounting structure disclosed in Patent Document 1 is used, when the sensor is to be replaced, it is only necessary to unscrew the screw, and it is not necessary to replace the entire bearing. According to the mounting structure of Patent Document 1, even if the bearing needs to be replaced due to damage, the sensor, tone ring, and cover can be removed from the bearing and these parts can be reused.

However, in the mounting structure of Patent Literature 1, thread cutting is required for the outer ring, inner ring, and sensor mounting cover of the bearing. In addition, in the mounting structure of Patent Document 1, the direction of rotation may be restricted so that the screw fastening is not loosened due to rotation, and the usage is limited.

The present disclosure has been made to solve the above problems, and an object of the present disclosure is to minimize the work on the bearing device and easily replace the bearing when it is damaged and needs to be replaced. Another object of the present invention is to provide a bearing device and a maintenance method for the bearing device, in which other parts can be reused.

A first aspect of the present disclosure relates to a bearing device comprising at least one bearing including a stationary ring, a rotating ring and rolling elements. The bearing device comprises: a fixed member fixed to one of the stationary ring and the rotating ring; a rotor fixed to the other of the stationary ring and the rotating ring so as to face the fixed member; a circuit board that is mounted on the member and transmits information about the condition of the bearing to the outside. At least one of the fixed member and the rotor is formed with an engaging portion with which the jig is engaged.

A second aspect of the present disclosure relates to a maintenance method for a bearing device, in which a jig is hooked to an engaging portion of a fixing member to fix the fixing member removed from the bearing to another bearing.

A third aspect of the present disclosure relates to a maintenance method for a bearing device, in which a magnetic ring removed from a bearing is fixed to another bearing by hooking a jig on the engaging portion of the rotor.

ADVANTAGE OF THE INVENTION According to the present disclosure, a bearing device and a bearing device that can easily reuse other parts when the bearing is damaged and needs to be replaced while minimizing the processing of the bearing device maintenance method can be provided.

1 is a cross-sectional view of a bearing device according to Embodiment 1; FIG. 4 is an enlarged view of the vicinity of the engaging portion of Embodiment 1. FIG. It is a figure which shows schematic structure of a generator. It is a figure which shows the state which opposingly arranged two magnetic material ring members of the same shape. It is a figure which shows the state which fitted two magnetic material ring members. It is a figure which shows a mode that the removed sensor unit is mounted|worn to a new bearing with a magnetic ring. 6 is a cross-sectional view of a bearing device according to Embodiment 2; FIG. FIG. 11 is an enlarged view of the vicinity of an engaging portion of Embodiment 2; FIG. 8 is a cross-sectional view of a bearing device according to Embodiment 3; FIG. 11 is an enlarged view of the periphery of an intermediate member according to Embodiment 3; FIG. 11 is a cross-sectional view of a bearing device according to Embodiment 4; FIG. 11 is an enlarged view of the periphery of a pin according to Embodiment 4;

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the embodiments described below, when referring to the number, amount, etc., the scope of the present disclosure is not necessarily limited to the number, amount, etc., unless otherwise specified. The same reference numbers are given to the same parts and equivalent parts, and redundant description may not be repeated. It is planned from the beginning to use the configurations in the embodiments in combination as appropriate.

[Embodiment 1]
FIG. 1 is a cross-sectional view of a bearing device 1 according to Embodiment 1, and FIG. 2 is an enlarged view around an engaging portion 21 according to Embodiment 1. As shown in FIG. A bearing with a wireless sensor is exemplified as the bearing device 1 shown in FIG. The bearing device 1 includes a bearing B, an outer ring 7 , a magnetic ring 8 , a stator 9 and a circuit board 10 . The bearing B includes an outer ring (stationary ring) 2 , an inner ring (rotating) 3 , rolling elements 4 , a retainer 5 and a seal 6 .

The outer ring 7 is formed in a cylindrical shape and is fixed to the inner diameter portion of the outer ring 2 by press fitting. An engaging portion 21 is formed on the outer diameter surface of the cylindrical portion 7a of the outer ring 7 . The outer diameter of the cylindrical portion 7 a of the outer ring 7 is the same size as the outer diameter of the outer ring 2 . The outer diameter of the cylindrical portion 7a of the outer ring 7 may be slightly smaller than the outer diameter of the outer ring 2. A heat insulating portion 11 is fixed to the inner diameter surface of the outer ring 7 .

A partition wall 11 a is provided in the heat insulating portion 11 . Two spaces are formed in the heat insulating portion 11 on the side of the bearing B and the side opposite to the bearing. The end face 11b on the bearing B side contacts the vertical portion 7b of the outer ring 7 . A magnetic ring 8 functioning as a rotor is fixed to the outer diameter surface of the inner ring 3 . The stator 9 is fixed so as to face the magnetic ring 8 in a space on the side opposite to the bearing of the partition wall 11 a of the heat insulating portion 11 . The stator 9 is fixed to the outer ring 7 via the heat insulating portion 11 . In addition, in the bearing device 1, a space may be provided on the bearing B side without providing the end surface 11b. Specifically, in the bearing device 1, the heat insulating portion 11 having an L-shaped cross section that also serves as the partition wall 11a is fixed to the outer ring 7, and a space is provided on the bearing B side by adjusting the depth.

The circuit board 10 is fixed to the end surface (vertical surface) of the outer ring 7 adjacent to the end surface of the outer ring 2 of the bearing B with screws, adhesive, or the like. The circuit board 10 is arranged in the bearing B side space sandwiched between the partition wall 11 a of the heat insulating portion 11 and the vertical portion 7 b of the outer ring 7 . A lid 12 is arranged on the outer end surface of the stator 9 . The lid 12 is press-fitted or adhesively fixed to the inner diameter surface of the outer ring 7 . The lid 12 has a two-layer structure having a heat radiation portion 12a and a heat insulation layer 12b. The heat radiating portion 12a is arranged on the inner diameter side in contact with the stator 9, and is made of a metal material with high thermal conductivity (for example, aluminum, copper, iron, etc.). The heat insulating layer 12b is arranged on the outer diameter side and is made of a heat insulating material (for example, an insulating material such as resin) having a low thermal conductivity. Note that the lid 12 may be entirely made of an insulating member (non-conductive member) such as resin.

A generator G is composed of the magnetic ring 8 and the stator 9 . Generator G is a claw pole generator. The bearing B is, for example, a deep-groove ball bearing having rolling elements 4 as balls. Here, an inner-ring rotating type in which the inner ring 3 is a rotating ring and the outer ring 2 is a stationary ring will be described as an example.

A magnetic ring 8 functioning as a rotor includes a metal core 8 a and multipolar magnets 8 b and is fixed to the inner ring (rotating ring) 3 . The multipolar magnet 8b is obtained by vulcanizing and adhering a magnetic material, for example, kneading magnetic powder and rubber to the core metal 8a, and then alternately magnetizing N poles and S poles in the circumferential direction.

The stator 9 includes two identically shaped magnetic ring members 13 (13-1, 13-2), a bobbin 14, and a coil 15. As shown in FIG. The winding of the coil 15 is wound around the bobbin 14 a plurality of times in the circumferential direction. Although an example using the bobbin 14 is shown here, the stator 9 may be configured using an air-core coil that does not use the bobbin 14 .

The circuit board 10 includes a power supply circuit 16 that rectifies the AC power generated by the generator G and converts it to DC, a sensor 17 that monitors the state of the bearing B, and a wireless circuit that transmits the output of the sensor 17 to the outside. A communication circuit 20 is implemented. Sensor 17 includes temperature sensor 18 and acceleration sensor 19 . The temperature sensor 18 is mounted on the back surface of the circuit board 10 so that it can be arranged at a position close to the bearing B. As shown in FIG. The temperature sensor 18 is inserted into a recess 7c (groove or hole) provided in the vertical portion 7b of the outer ring 7. As shown in FIG. Circuit board 10 is an expensive component on which multiple sensors are mounted.

The winding start and winding end portions (not shown) of the coil 15 are connected to the circuit board 10 via a groove 12c provided on the side surface of the lid 12 and a groove 11c provided on the outer periphery of the heat insulating portion 11. FIG. In FIG. 1, wiring of each end of the coil 15 is omitted. AC power output from the generator G as the inner ring 3 rotates is converted into DC power by the power supply circuit 16 . A protective film such as resin may be applied to the surface of the circuit board 10 .

The circuit board 10 on which the wireless communication circuit 20 is mounted is arranged to face the heat insulation section 11 . By using an insulator (non-conductive material) such as resin with low thermal conductivity as the heat insulating part 11 and using an insulating material for the heat insulating layer 12b formed on the outer peripheral surface of the lid 12, the outer ring 7 and A cylindrical insulator is formed between it and the stator 9 . As a result, the wireless communication circuit 20 has a structure that is not sealed with a conductive material such as metal, so wireless communication is possible using the antenna section 20a. Alternatively, the wireless communication circuit 20 may be formed as a separate substrate (not shown) and arranged between the lid 12 and the stator 9 . In this case, the material of the portion of the lid 12 facing the antenna portion 20a of the wireless communication circuit 20 is preferably an insulating member.

The stator 9 of the generator G is thermally insulated from metal members such as the outer ring 7 by the heat insulating portion 11 . When the magnetic ring 8 fixed to the inner ring 3 rotates to generate electricity, the heat generated by the iron loss of the stator 9 is not directly conducted to the bearing B side. Therefore, only the heat generated by the rotation of the bearing B can be detected by the temperature sensor 18 .

The seal 6 is not arranged on the side of the bearing B to which the magnetic ring 8 is fixed. However, since the lid 12 is provided to cover the magnetic ring 8 and the stator 9, and the gap between the parts is narrowed, a labyrinth seal (non-contact seal) structure is provided, which can prevent foreign matter from entering.

The lid 12 is formed in a two-layer structure having a heat radiating portion 12a with high thermal conductivity and a heat insulating layer 12b with low thermal conductivity around its periphery. The cover 12 is provided with a folded portion 12d that wraps around the inner diameter side of the metal core 8a of the magnetic ring 8 in order to increase the volume and surface area of the heat radiating portion 12a for cooling the stator 9. As shown in FIG. The sealing performance of the lid 12 is improved by the folded portion 12d.

Since the end surface of the stator 9 is in contact with the heat radiating portion 12a, the heat generated by the stator 9 can be efficiently radiated to the outside by the heat radiating portion 12a. The heat insulating layer 12b prevents the temperature of the heat radiating portion 12a from being directly transmitted to the outer ring 7, so that the heat generated by the stator 9 can be prevented from affecting the bearing B. The stator 9 can be effectively cooled while suppressing heat transfer to the bearing B by the heat radiation portion 12a and the heat insulating layer 12b. By forming grooves (not shown) on the outer surface of the heat radiating portion 12a to increase the surface area, heat radiation can be further improved.

As shown in FIG. 2 , an engaging portion 21 that functions as a removing portion for removing the outer ring 7 from the outer ring 2 is formed on the outer diameter surface of the cylindrical portion 7 a of the outer ring 7 . The engaging portion 21 is provided with a stepped portion 21a having a surface substantially perpendicular to the rotation axis. For example, the outer ring 7 can be removed from the outer ring 2 by pushing or hitting the stepped portion 21a of the engaging portion 21 in the direction opposite to the bearing B side with a jig (not shown) such as a flat-blade screwdriver. Thus, the outer ring 7 containing the stator 9 of the generator G and the circuit board 10 including the sensor 17 can be removed from the outer ring 2 as the sensor unit 22 .

The bearing B of the bearing device 1 may need to be replaced due to damage such as peeling on the rolling surface. The sensor unit 22 is not adhesively fixed, and can be easily removed from the outer ring 2 by pressing the stepped portion 21a with a jig or by applying an impact. The removed sensor unit 22 can be reused by attaching it to a new bearing B. In this way, the bearing device 1 can minimize the processing of the bearing device 1 and, when the bearing B is damaged and needs to be replaced, other parts can be easily reused. Reuse of the sensor unit 22 including the outer ring 7 can reduce replacement costs.

Embodiment 1 relates to a maintenance method for the bearing device 1, in which the outer ring 7 removed from the bearing B is fixed to another bearing B by hooking a jig on the engaging portion 21 of the outer ring 7. FIG. By such a maintenance method, while minimizing the machining of the bearing device 1, when the bearing B is damaged and needs to be replaced, the sensor unit 22 including the outer ring 7 can be easily reused. can be done.

FIG. 3 is a diagram showing a schematic configuration of the generator G. As shown in FIG. Generator G is a claw pole generator. The magnetic rotor is composed of a ring-shaped multipolar magnet 8b. The stator 9 is composed of a coil 15 and a magnetic yoke surrounding it. The magnetic yoke is composed of magnetic ring members 13 (13-1, 13-2). The magnetic flux emitted from the N pole of the multipolar magnet 8b enters the magnetic yoke from the magnetic pole claw 13b, goes around the coil, and enters the S pole of the multipolar magnet 8b from the adjacent claw 13b. When the positions of the N pole and the S pole of the multipolar magnet 8b are switched depending on the rotation angle of the magnetic rotor, the direction of the magnetic flux is reversed. An alternating voltage is generated across the coil 15 by the alternating magnetic field thus generated.

The structure of the stator 9 will be described with reference to FIGS. 4 and 5. FIG. FIG. 4 is a diagram showing a state in which two magnetic ring members 13 having the same shape are arranged facing each other. Actually, the space sandwiched between the two magnetic ring members 13-1 and 13-2 accommodates the bobbin 14 around which the coil 15 is wound. The bobbin 14 used is omitted. FIG. 5 is a diagram showing a state in which two magnetic ring members 13 are fitted together.

At the inner peripheral end of the magnetic ring member 13 (13-1, 13-2), grooves 13a and claws 13b opening toward the shaft are alternately formed in a comb shape. A concave portion 13c and a convex portion 13d are formed on the end face 13f of the magnetic ring member 13 (13-1, 13-2). In the magnetic ring member 13, when two magnetic ring members 13-1 and 13-2 having the same shape are opposed to each other and the claws 13b are arranged alternately, one magnetic ring The concave portion 13c and the convex portion 13d are engaged by designing such that the convex portion 13d of the other magnetic ring member 13-2 is arranged with respect to the concave portion 13c of the member 13-1.

The concave portions 13c and the convex portions 13d provided on the end face 13f of each magnetic ring member 13 are fitted so that the claws 13b provided on each magnetic ring member 13 are alternately arranged. By doing so, it becomes easy to dispose the magnetic ring members 13 so that the gaps between the claws 13b and the claws 13b of the magnetic ring members 13 are uniform. Further, since a plurality of concave portions 13c and convex portions 13d are arranged in the circumferential direction, the positions of the magnetic ring members 13 can be fixed without being displaced in the circumferential direction.

The N pole and S pole of the magnetic ring 8 have the same number of magnetized poles and the same magnetic pole pitch. A hole 13e provided in the side surface of the magnetic ring member 13 is used to pull out the end of the coil 15 to the outside.

A circuit board 10 is fixed at a position near the bearing B in the bearing device 1 shown in FIG. Therefore, the bearing device 1 can measure the acceleration caused by the vibration caused by the bearing B by using the acceleration sensor 19 mounted on the circuit board 10 before the vibration attenuates. In the abnormality diagnosis based on the measured acceleration, the diagnosis can be made using a signal with little attenuation, so that the abnormality of the bearing B can be accurately diagnosed.

In the bearing device 1 , the stator 9 and the outer ring 7 are thermally insulated by the heat insulating portion 11 . Therefore, the temperature sensor 18 mounted on the circuit board 10 can accurately monitor the temperature rise of the bearing B without being affected by the heat generated by the stator 9 . The bearing device 1 is provided with a lid 12 having a heat radiating portion 12a with excellent heat conductivity and good heat dissipation at a portion that abuts on the outer end face of the stator 9. Therefore, the heat generated in the stator 9 is effectively dissipated to the outside. can be released The lid 12 of the bearing device 1 is provided with a heat insulating layer 12b made of an insulating material with low thermal conductivity and excellent heat insulation on the outer periphery of the heat radiating portion 12a. It is possible to prevent the heat generated in the stator 9 from affecting the bearing B.

When the sensor output is wirelessly communicated, it is preferable that at least the antenna portion 20a of the circuit board 10 on which the wireless communication circuit 20 is mounted face the heat insulating portion 11 at a position that does not overlap the stator 9 in the axial direction. A ring-shaped insulating layer is formed between the outer ring 7 and the stator 9 by using an insulating material (non-conductive material) such as resin for the heat insulating portion 11 and the heat insulating layer 12b. By using an insulator layer that allows radio waves to pass through, the wireless communication circuit 20 has a structure that is not sealed with a conductive material such as metal, thereby enabling wireless communication.

In the bearing device 1, the claw-pole generator was described as an example of the generator G, but other generators may be used. In the bearing device 1, the outer ring 2 of the bearing B may be fixed to a rotating member to form a rotating ring, and the inner ring 3 may be fixed to a stationary member to form a stationary ring.

In the bearing device 1 , a heat insulating coating may be applied to the surface of the magnetic ring 8 facing the stator 9 to suppress temperature rise due to radiant heat from the stator 9 and to suppress heat transfer to the inner ring 3 .

FIG. 6 is a diagram showing how the removed sensor unit 22 is attached to a new bearing 23 with a magnetic ring. A bearing 23 with a magnetic ring, in which a new magnetic ring 8 is fixed to the inner ring 3 of a new bearing B, is prepared. The sensor unit 22 removed from the used bearing device 1 is press-fitted and fixed to the outer ring 2 of a new bearing 23 with a magnetic ring for reuse. As a result, the new manufacturing cost of the bearing device 1 can be reduced.

The bearing device 1 of Embodiment 1 has a structure in which the sensor unit 22 is press-fitted and fixed to the outer ring 2 . As a result, the bearing B does not require machining such as threading, and the structure can be made compact. In the bearing device 1 of Embodiment 1, the sensor unit 22 can be easily removed by applying an external force to the stepped portion 21a of the engaging portion 21 in the direction opposite to the bearing B side. Thereby, the sensor unit 22 can be reused.

In the bearing device 1 of Embodiment 1, the case where the stepped portion 21a is provided as the shape of the engaging portion 21 used when removing the sensor unit 22 from the bearing B has been described. The engagement portion 21 may be formed by forming a rectangular hole in the cylindrical portion 7a of the outer ring 7. As shown in FIG. The shape of the hole is not limited to square.

[Embodiment 2]
FIG. 7 is a cross-sectional view of a bearing device 1A according to the second embodiment, and FIG. 8 is an enlarged view around an engaging portion 8a1 according to the second embodiment. In the bearing device 1A of Embodiment 2, the magnetic ring 8 is provided with the engaging portion 8a1, and the magnetic ring 8 can be reused. In the following, in the bearing device 1A, the same components as those of the bearing device 1 of FIG. 1 are denoted by the same reference numerals, and detailed description thereof will not be repeated.

In the bearing device 1A, a plurality of engaging portions 8a1 are formed on the vertical portion 8a2 of the cored bar 8a. The shape of the engaging portion 8a1 is a hole such as a circular hole or an elongated hole (or fan shape). In the bearing device 1A, for example, engaging portions 8a1 are formed at four locations in the circumferential direction.

When removing the magnetic ring 8 from the bearing device 1A, a jig (not shown) is inserted into the hole of the engaging portion 8a1, for example, by hooking the jig on the end portion 8a3 or the vertical portion 8a2 of the cored bar 8a, and the magnetic ring 8 is pulled out. Thereby, the magnetic ring 8 can be removed from the inner ring 3 and the removed magnetic ring 8 can be reused. When fixing the removed magnetic ring 8 to the inner ring 3 of the new bearing B, a jig (not shown) may be used to control the press-fitting depth.

A metal core 8a of the magnetic ring 8 is a press-molded product of a thin metal plate. Since the metal core 8a is thin, care should be taken not to deform it when the magnetic ring 8 is removed. The thickness of the metal core 8a may be increased so that the metal core 8a is not deformed when the magnetic ring 8 is removed from the inner ring 3 .

Embodiment 2 relates to a maintenance method for the bearing device 1A, in which the magnetic ring 8 removed from the bearing B is fixed to another bearing B by hooking a jig on the engaging portion 8a1 of the magnetic ring 8. FIG. By such a maintenance method, the magnetic ring 8 can be easily reused when the bearing B is damaged and needs to be replaced while minimizing the processing of the bearing device 1A.

[Embodiment 3]
FIG. 9 is a cross-sectional view of a bearing device 1B according to the third embodiment, and FIG. 10 is an enlarged view around an intermediate member 24 according to the third embodiment. In the bearing device 1B of Embodiment 3, the magnetic ring 8 is fixed to the inner ring 3 via the intermediate member 24. As shown in FIG. In the following, in the bearing device 1B, the same components as those of the bearing device 1 of FIG. 1 are denoted by the same reference numerals, and detailed description thereof will not be repeated.

The magnetic ring 8 of the bearing device 1B is fixed to the outer diameter surface of the intermediate member 24 in advance. The intermediate member 24 to which the magnetic ring 8 is fixed is fixed to the outer diameter surface of the inner ring 3 by press fitting or the like. The intermediate member 24 is a ring member that is thicker than the metal core 8a of the magnetic ring 8 and has an L-shaped cross section. The intermediate member 24 has an axially extending cylindrical portion 24a and a radially extending flange portion 24b. The magnetic ring 8 of the bearing device 1B can be arranged at a prescribed position in the axial direction by press-fitting the flange portion 24b into contact with the end face of the inner ring 3 without using a dedicated press-fitting jig.

An engaging portion 24c is formed on the flange portion 24b of the intermediate member 24 on the side that contacts the end face of the inner ring 3. As shown in FIG. The engaging portion 24c is a concave portion machined over the entire circumference. When removing the magnetic ring 8 from the bearing device 1B, the intermediate member 24 may be removed from the inner ring 3 by inserting a jig (not shown) such as a flat-blade screwdriver into the engaging portion 24c. As a result, deformation of the magnetic ring 8 can be suppressed, and it becomes easy to reuse the magnetic ring 8 to which the intermediate member 24 is fixed. When reusing the magnetic ring 8 of the bearing device 1B, a dedicated press-fitting jig is not required, and the reassembling work can be made easier. In addition, the engagement part 24c may have a configuration in which recesses are provided at a plurality of locations on the circumference instead of processing the entire circumference.

[Embodiment 4]
FIG. 11 is a cross-sectional view of a bearing device 1C according to the fourth embodiment, and FIG. 12 is an enlarged view of the periphery of the pin 26 according to the fourth embodiment. A pin 26 is fixed to the outer ring 2 of the bearing device 1</b>C of the fourth embodiment. In the following, in the bearing device 1C, the same components as those of the bearing device 1 of FIG. 1 and the bearing device 1B of FIG. 9 are denoted by the same reference numerals, and detailed description thereof will not be repeated.

A plurality of (two or more) holes 25 are provided in the end surface of the outer ring 2 (stationary ring) of the bearing BA of the bearing device 1C shown in FIG. A pin 26 is fixed to each hole 25 by press-fitting, bonding, or press-fitting and bonding.

The outer ring 7A has a vertical portion 7A1 in contact with the end face of the outer ring 2 and a cylindrical portion 7A2 arranged coaxially with the outer diameter surface of the outer ring 2 . A stator 9 and a circuit board 10 including a sensor 17 are mounted on the inner diameter side of the cylindrical portion 7A2 in the same manner as in FIG. 1 to form a sensor unit 22A. The magnetic ring 8 is fixed to the inner ring 3 via an intermediate member 24, as in FIG.

A plurality of (two or more) holes 27 are formed in the vertical portion 7A1 of the outer ring 7A. By fitting and fixing the hole 27 and the pin 26, the sensor unit 22A can be fixed (arranged) to the end face of the bearing BA. An engaging portion 21 is formed in the cylindrical portion 7A2 of the outer ring 7A in the same manner as in FIG. The engaging portion 21 has a stepped portion 21a substantially perpendicular to the rotation axis.

In the bearing device 1C, the pin 26 fixed to the outer ring 2 of the bearing BA and the hole 27 of the sensor unit 22A are press-fitted (interference fit). Thereby, the bearing BA and the sensor unit 22A can be easily integrated and coaxially aligned. When it is desired to separate the sensor unit 22A from the bearing BA, the stepped portion 21a of the engaging portion 21 can be tapped on the side opposite to the bearing BA with a jig (not shown) such as a flat-blade screwdriver as in FIG.

Since the bearing device 1C has a small joint portion (press-fit portion) in the hole portion 27 between the bearing BA and the sensor unit 22A, the sensor unit 22A (outer ring 7A) can be easily removed from the outer ring 2. The removed sensor unit 22A can be reused by attaching it to a new bearing BA. The bearing device 1C can reuse the magnetic ring 8 to which the intermediate member 24 is fixed as in FIG. As a result, the bearing device 1C can reduce replacement costs for the sensor unit 22A and the magnetic ring 8. FIG.

(summary)
The present disclosure relates to a bearing device 1 comprising at least one bearing B including a stationary outer ring 2 , a rotating inner ring 3 and rolling elements 4 . The bearing device 1 includes an outer ring 7 as a fixed member fixed to either one of the outer ring 2 and the inner ring 3, and an outer ring 7 as a fixed member fixed to one of the outer ring 2 and the inner ring 3, and a fixing member attached to the other of the outer ring 2 and the inner ring 3 so as to face the outer ring 7. It comprises a magnetic ring 8 as a fixed rotor and a circuit board 10 mounted on the outer ring 7 and transmitting information about the state of the bearing B to the outside. At least one of the outer ring 7 and the magnetic ring 8 is formed with engaging portions 21 and 8a1 with which a jig is engaged.

By providing such a configuration, it is possible to minimize the processing of the bearing device 1 and easily reuse other parts when the bearing B is damaged and needs to be replaced.

Preferably, outer ring 7 holds circuit board 10 . The engaging portion 21 is a stepped portion 21a having a surface substantially perpendicular to the rotation axis of the bearing B, and the stepped portion 21a is formed at a position facing one end of the bearing.

With such a configuration, when the bearing B is damaged and needs to be replaced, the outer ring 7 can be easily replaced by a simple process of forming the stepped portion 21a on the outer ring 7 of the bearing device 1. can be used.

Preferably, the magnetic ring 8 includes a metal core 8a and a multipolar magnet 8b, and the engaging portion 8a1 is formed on the metal core 8a.

With such a configuration, the magnetic ring 8 can be easily replaced when the bearing B is damaged and needs to be replaced by a simple process of forming the engaging portion 8a1 on the core bar 8a of the bearing device 1A. Can be reused.

Preferably, the magnetic ring 8 includes an intermediate member 24 for fixing to the inner ring 3, and the engaging portion 24c is formed in the intermediate member 24. As shown in FIG.

By providing such a structure, the magnetic ring 8 can be easily removed by a simple process of forming the engaging portion 24c in the intermediate member 24 of the bearing device 1B when the bearing B is damaged and needs to be replaced. Can be reused.

Preferably, a plurality of pins 26 extending in the axial direction are fixed to one end of the outer ring 2, and a plurality of holes 27 are formed in the outer ring 7A at positions facing the plurality of pins 26. and the plurality of holes 27 are fitted to fix the bearing BA and the outer ring 7A.

By providing such a configuration, it is possible to fix the pin 26 to the outer ring 2 of the bearing device 1C and form the hole 27 in the outer ring 7A by simple processing, even if the bearing BA is damaged and needs to be replaced. In addition, the outer ring 7A can be easily reused.

Preferably, the stator 9 is arranged on the opposite side of the bearing B with the circuit board 10 interposed therebetween, and the magnetic ring 8 and the stator 9 form a claw pole generator.

By providing such a configuration, a claw-pole generator in which the magnetic ring 8 can be reused can be obtained.

Preferably, the circuit board 10 includes a power supply circuit 16 that receives the output of the generator G and generates a power supply voltage, at least one sensor 17 that detects the state of the bearing B, and at least one sensor to which the power supply voltage is supplied. and a wireless communication circuit 20 for wirelessly transmitting the output of 17 to the outside.

By providing such a configuration, the state of the bearing B can be transmitted to the outside.

The present disclosure is a maintenance method for the bearing device 1 in which the outer ring 7 removed from the bearing B is fixed to another bearing B by hooking a jig on the engaging portion 21 of the outer ring 7 .

With such a configuration, the outer ring 7 can be easily reused when the bearing B is damaged and needs to be replaced, while minimizing the machining of the bearing device 1 .

The present disclosure is a maintenance method for the bearing device 1A, in which the magnetic ring 8 removed from the bearing B is fixed to another bearing B by hooking a jig on the engaging portion 8a1 of the magnetic ring 8. FIG.

With such a configuration, the magnetic ring 8 can be easily reused when the bearing B is damaged and needs to be replaced, while minimizing the processing of the bearing device 1A.

The embodiments disclosed this time should be considered as examples and not restrictive in all respects. The scope of the present disclosure is indicated by the scope of claims rather than the description of the above-described embodiments, and is intended to include all modifications within the scope and meaning equivalent to the scope of the claims.

1, 1A, 1B, 1C bearing device, 2 outer ring, 3 inner ring, 4 rolling element, 5 retainer, 6 seal, 7, 7A outer ring (fixing member), 7A 2, 7a, 24a cylindrical portion, 8 magnetic ring (rotor ), 8a1, 21, 24c engaging portion 8a core metal 8b multipolar magnet 9 stator 10 circuit board 11 heat insulating portion 11a partition wall 12 lid 12a heat radiating portion 12b heat insulating layer 12d folded portion 13 Magnetic ring member 14 Bobbin 15 Coil 16 Power supply circuit 17 Sensor 18 Temperature sensor 19 Acceleration sensor 20 Wireless communication circuit 20a Antenna part 21a Stepped part 22, 22A Sensor unit 23 Bearing with magnetic ring , 24 intermediate member, 24b flange, 25 hole, 26 pin, 27 hole, B, BA bearing, G generator.

Claims (9)

A bearing device comprising at least one bearing including a stationary ring, a rotating ring and rolling elements,
a fixing member fixed to one of the stationary ring and the rotating ring;
a rotor fixed to the other of the stationary ring and the rotating ring so as to face the fixed member;
a circuit board that is mounted on the fixed member and transmits information about the state of the bearing to the outside,
A bearing device, wherein at least one of the fixed member and the rotor is formed with an engaging portion with which a jig is engaged. The fixing member is an outer ring that holds the circuit board,
the engaging portion is a stepped portion having a surface substantially perpendicular to the rotation axis of the bearing;
2. The bearing device according to claim 1, wherein said stepped portion is formed at a position facing one end of said bearing. The rotor includes a metal core and multipolar magnets,
2. The bearing device according to claim 1, wherein said engaging portion is formed on said cored bar. the rotor includes an intermediate member for fixing to the rotating wheel;
2. The bearing device according to claim 1, wherein said engaging portion is formed in said intermediate member. A plurality of axially extending pins are fixed to one end of the stationary ring,
The outer ring has a plurality of holes formed at positions facing the plurality of pins,
3. The bearing device according to claim 2, wherein said bearing and said outer ring are fixed by fitting said plurality of pins into said plurality of holes. the rotor is a magnetic ring,
A stator is arranged on the side opposite to the bearing across the circuit board,
6. A bearing arrangement according to any one of claims 1 to 5, wherein the magnetic ring and the stator constitute a claw pole generator. The circuit board is
a power supply circuit that receives the output of the generator and generates a power supply voltage;
at least one sensor for detecting the condition of the bearing;
7. The bearing device according to claim 6, further comprising a wireless communication circuit to which said power supply voltage is supplied and which wirelessly transmits the output of said at least one sensor to the outside. Using the bearing device according to any one of claims 1 to 7, the fixing member removed from the bearing is fixed to another bearing by hooking the jig on the engaging portion of the fixing member. , bearing device maintenance methods. A bearing comprising the bearing device according to any one of claims 1 to 7, wherein the rotor removed from the bearing is fixed to another bearing by hooking the jig on the engaging portion of the rotor. How to maintain the equipment.

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