JP6264393B2

JP6264393B2 - Bearing with wireless sensor

Info

Publication number: JP6264393B2
Application number: JP2016074109A
Authority: JP
Inventors: 邦彦笹尾; 俊彦岡村; 小林　英樹; 英樹小林
Original assignee: NSK Ltd
Current assignee: NSK Ltd
Priority date: 2016-04-01
Filing date: 2016-04-01
Publication date: 2018-01-24
Anticipated expiration: 2036-04-01
Also published as: JP2017187061A

Description

この発明は、発電機構を有するワイヤレスセンサ付き軸受に関する。 The present invention relates to a bearing with a wireless sensor having a power generation mechanism.

ワイヤレスセンサ付き軸受の従来例としては、特許文献１に記載されたものがある。特許文献１に記載されたワイヤレスセンサ付き軸受では、転がり軸受の軸受空間を密封するシールにセンサユニットを設けている。このセンサユニットは、転がり軸受の状態情報を検出するセンサと、このセンサが検出した情報を取り扱う情報取扱手段と、情報取扱手段およびセンサを駆動可能な発電機能を有する電源を有する。
つまり、特許文献１に記載された発明は、既存の転がり軸受のシールをセンサユニット付きのシールに交換するだけで、発電機能を有するワイヤレスセンサ付き軸受を得ることを目指したものと言える。 A conventional example of a bearing with a wireless sensor is described in Patent Document 1. In the bearing with a wireless sensor described in Patent Document 1, a sensor unit is provided in a seal that seals the bearing space of the rolling bearing. The sensor unit includes a sensor that detects state information of the rolling bearing, information handling means that handles information detected by the sensor, and a power source that has a power generation function capable of driving the information handling means and the sensor.
That is, it can be said that the invention described in Patent Document 1 aims to obtain a bearing with a wireless sensor having a power generation function by simply replacing the seal of an existing rolling bearing with a seal with a sensor unit.

しかし、特許文献１には、電源に関して、熱発電素子であるゼーベック素子や振動発電素子であるエレクトレット素子を用いた発電機構が適用できると記載されている。これらの発電機構では、転がり軸受の使用初期の低速回転時には、シール表裏面での温度差やシールに生じる振動が小さいことから、必要な電力を得ることが難しい。
また、ワイヤレスセンサ付き軸受の発電機構については、例えば、特許文献２に、内輪よび外輪の一方に、周方向に沿ってＮ極とＳ極が交互に配置された環状の磁石を固定し、この磁石と軸方向で対向する環状の導体を他方に固定し、磁石と導体との相対回転により起電力を生じさせる技術も開示されている。これらの環状の磁石および導体は、既存の転がり軸受の構成部品に追加で必要となるものである。 However, Patent Document 1 describes that a power generation mechanism using a Seebeck element that is a thermoelectric generation element or an electret element that is a vibration power generation element can be applied to a power source. In these power generation mechanisms, it is difficult to obtain necessary electric power because the temperature difference between the front and back surfaces of the seal and the vibration generated in the seal are small during low-speed rotation in the initial stage of use of the rolling bearing.
Regarding the power generation mechanism of the bearing with the wireless sensor, for example, in Patent Document 2, an annular magnet in which N poles and S poles are alternately arranged along the circumferential direction is fixed to one of the inner ring and the outer ring. A technique is also disclosed in which an annular conductor facing the magnet in the axial direction is fixed to the other, and an electromotive force is generated by relative rotation between the magnet and the conductor. These annular magnets and conductors are additionally required for existing rolling bearing components.

特開２０１２−１４９７１６号公報JP 2012-149716 A 特開２００３−９７５８２号公報JP 2003-97582 A

この発明の課題は、発電機能を有するワイヤレスセンサ付き軸受として、既存の転がり軸受の構成部品の交換などにより簡単に得られ、使用初期や低速回転時であっても必要な電力が得られてセンサ機能が発揮できるものを提供することである。 An object of the present invention is to provide a wireless sensor-equipped bearing having a power generation function, which can be easily obtained by exchanging components of an existing rolling bearing, etc. It is to provide something that can function.

上記課題を解決するために、この発明の第一態様であるワイヤレスセンサ付き軸受は、下記の構成(1) 〜(7) を有する。
(1) 外周面に内輪軌道面を有する内輪と、前記内輪軌道面と対向配置される外輪軌道面を内周面に有する外輪と、前記内輪軌道面と前記外輪軌道面とで形成される軌道に配置された転動体と、を有する。
(2) 環状体からなる保持器であって、前記転動体を回転自在に保持するポケットを有し、前記ポケットは前記環状体の周面を貫通し、前記ポケットは前記環状体の周方向に複数個形成された保持器を有する。隣り合う前記ポケット間の部分に、軸方向に伸びる貫通穴が形成されている。
(3) 複数の磁石であって、前記保持器の前記貫通穴に一つずつ、前記環状体の周方向で各磁石のＮ極とＳ極が隣り合うように固定された磁石を有する。
(4) 前記内輪と前記外輪との間を軸方向一端部で密封する第一シールであって、前記保持器に対して相対回転する第一シールと、前記第一シールの前記磁石との対向面に固定されたコイルと、前記内輪と前記外輪との間を軸方向他端部で密封する第二シールと、を有する。
(5) 前記内輪、前記外輪、および前記第一シールのいずれかに設置されたセンサを有する。
(6) 前記第一シールに形成された回路部であって、前記磁石と前記コイルとの相対回転による電磁誘導で前記コイルに生じた電流を電源供給部へ供給する電源回路と、前記センサで検出された検出情報から検出値を演算する演算回路と、演算結果を示す無線信号を作成する無線回路と、を備えた回路部を有する。
(7) 前記無線信号を送信するアンテナであって、前記第一シールに固定されたアンテナを有する。
この発明の第二態様であるワイヤレスセンサ付き軸受は、上記構成(1) (4) 〜(7) と下記の構成(12)(13)を有する。
(12)環状体からなる保持器であって、前記転動体を回転自在に保持するポケットを有し、前記ポケットは前記環状体の周面を貫通し、前記ポケットは前記環状体の周方向に複数個形成された保持器を有する。隣り合う前記ポケット間の部分に、軸方向一端面から軸方向に凹む凹部が形成されている。
(13)複数の磁石であって、前記保持器の前記凹部に一つずつ、前記環状体の周方向で各磁石のＮ極とＳ極が隣り合うように固定された磁石を有する。
この発明の第三態様であるワイヤレスセンサ付き軸受は、上記構成(1) (4) 〜(7) と下記の構成(22)〜(24)を有する。
(22)環状体からなる保持器であって、前記転動体を回転自在に保持するポケットを有し、前記ポケットは前記環状体の周面を貫通し、前記ポケットは前記環状体の周方向に複数個形成された保持器を有する。
(23)複数の磁石であって、前記保持器の前記ポケット同士の間に一つずつ、前記環状体の周方向で各磁石のＮ極とＳ極が隣り合うように固定された磁石を有する。
(24)円環状の金属板からなり、前記保持器内の前記軸方向他端部側に配置されたヨークを有する。前記ヨークが前記磁石の軸方向端面と接触し、前記保持器の底部と前記磁石との間に前記ヨークが存在する。 In order to solve the above problems, a bearing with a wireless sensor which is a first aspect of the present invention has the following configurations (1) to (7).
(1) A track formed by an inner ring having an inner ring raceway surface on an outer peripheral surface, an outer ring having an outer ring raceway surface disposed opposite to the inner ring raceway surface, and the inner ring raceway surface and the outer ring raceway surface. And a rolling element disposed in the.
(2) A cage made of an annular body, having a pocket for rotatably holding the rolling element, the pocket penetrating the circumferential surface of the annular body, and the pocket extending in the circumferential direction of the annular body A plurality of cages are formed. A through hole extending in the axial direction is formed in a portion between the adjacent pockets.
(3) A plurality of magnets, each of which is fixed to the through hole of the retainer so that the north and south poles of each magnet are adjacent to each other in the circumferential direction of the annular body.
(4) A first seal that seals between the inner ring and the outer ring at one end in the axial direction, and the first seal that rotates relative to the retainer and the magnet of the first seal are opposed to each other A coil fixed to the surface, and a second seal that seals between the inner ring and the outer ring at the other end in the axial direction.
(5) It has a sensor installed on any of the inner ring, the outer ring, and the first seal.
(6) A circuit unit formed on the first seal, the power source circuit supplying current generated in the coil by electromagnetic induction due to relative rotation between the magnet and the coil to the power supply unit, and the sensor The circuit unit includes an arithmetic circuit that calculates a detection value from detected detection information, and a wireless circuit that generates a wireless signal indicating a calculation result.
(7) An antenna for transmitting the radio signal, the antenna being fixed to the first seal.
The bearing with a wireless sensor according to the second aspect of the present invention has the above configurations (1) (4) to (7) and the following configurations (12) and (13).
(12) A cage made of an annular body, having a pocket for rotatably holding the rolling element, the pocket penetrating the circumferential surface of the annular body, and the pocket in the circumferential direction of the annular body A plurality of cages are formed. A recess that is recessed in the axial direction from one axial end surface is formed in a portion between the adjacent pockets.
(13) A plurality of magnets, each of which is fixed to the concave portion of the retainer so that the north and south poles of each magnet are adjacent to each other in the circumferential direction of the annular body.
The bearing with a wireless sensor according to the third aspect of the present invention has the above configurations (1) (4) to (7) and the following configurations (22) to (24).
(22) A cage made of an annular body, having a pocket for rotatably holding the rolling element, the pocket penetrating the circumferential surface of the annular body, and the pocket in the circumferential direction of the annular body A plurality of cages are formed.
(23) A plurality of magnets, each of which is fixed between the pockets of the cage, such that the N pole and the S pole of each magnet are adjacent to each other in the circumferential direction of the annular body. .
(24) A yoke made of an annular metal plate and disposed on the other axial end side in the cage. The yoke contacts the axial end face of the magnet, and the yoke exists between the bottom of the cage and the magnet.

この発明のワイヤレスセンサ付き軸受によれば、既存の転がり軸受の保持器とシールを交換するだけで簡単に得られ、使用初期や低速回転時であっても必要な電力が得られてセンサ機能が発揮できる。 According to the bearing with a wireless sensor of the present invention, it can be obtained simply by replacing the cage and seal of the existing rolling bearing, and the necessary power can be obtained even at the initial use or during low-speed rotation, and the sensor function can be obtained. Can demonstrate.

第一実施形態のワイヤレスセンサ付き軸受を示す断面図である。It is sectional drawing which shows the bearing with a wireless sensor of 1st embodiment. 第一実施形態のワイヤレスセンサ付き軸受を構成する磁石、保持器、およびヨークを示す斜視図である。It is a perspective view which shows the magnet, the holder | retainer, and yoke which comprise the bearing with a wireless sensor of 1st embodiment. 第一実施形態のワイヤレスセンサ付き軸受から第一シールを外した状態を示す斜視図（ａ）と、第一シールの芯金を示す斜視図（ｂ）である。They are the perspective view (a) which shows the state which removed the 1st seal | sticker from the bearing with a wireless sensor of 1st embodiment, and the perspective view (b) which shows the metal core of a 1st seal | sticker. 第一、第二、第三実施形態のワイヤレスセンサ付き軸受が有する回路構成を示す模式図である。It is a schematic diagram which shows the circuit structure which the bearing with a wireless sensor of 1st, 2nd, 3rd embodiment has. 第二実施形態のワイヤレスセンサ付き軸受を示す断面図である。It is sectional drawing which shows the bearing with a wireless sensor of 2nd embodiment. 第三実施形態のワイヤレスセンサ付き軸受を示す断面図である。It is sectional drawing which shows the bearing with a wireless sensor of 3rd embodiment.

以下、この発明の実施形態について説明するが、この発明は以下に示す実施形態に限定されない。以下に示す実施形態では、この発明を実施するために技術的に好ましい限定がなされているが、この限定はこの発明の必須要件ではない。 Hereinafter, although embodiment of this invention is described, this invention is not limited to embodiment shown below. In the embodiment described below, a technically preferable limitation is made for carrying out the present invention, but this limitation is not an essential requirement of the present invention.

［第一実施形態］
図１に示すように、この実施形態のワイヤレスセンサ付き軸受１０は、内輪１、外輪２、ボール（転動体）３と、保持器４と、八個（複数個、偶数個）の磁石５と、ヨーク６と、第一シール７と、第二シール７Ａを有する。
内輪１の外周面には、軸方向中央部に内輪軌道面１１が形成され、軸方向両端部にシール配置用の周溝１２が形成されている。外輪２の内周面には、軸方向中央部に外輪軌道面２１が形成され、軸方向両端部にシール取付溝２２が形成されている。内輪軌道面１１と外輪軌道面２１が対向配置され、内輪軌道面１１と外輪軌道面２１とで形成される軌道に、ボール３が配置されている。 [First embodiment]
As shown in FIG. 1, a bearing 10 with a wireless sensor of this embodiment includes an inner ring 1, an outer ring 2, a ball (rolling element) 3, a cage 4, and eight (multiple, even number) magnets 5. And a yoke 6, a first seal 7, and a second seal 7A.
On the outer peripheral surface of the inner ring 1, an inner ring raceway surface 11 is formed at the axially central portion, and circumferential grooves 12 for seal arrangement are formed at both axial end portions. On the inner peripheral surface of the outer ring 2, an outer ring raceway surface 21 is formed in the central portion in the axial direction, and seal mounting grooves 22 are formed in both axial end portions. The inner ring raceway surface 11 and the outer ring raceway surface 21 are disposed to face each other, and the ball 3 is disposed on a track formed by the inner ring raceway surface 11 and the outer ring raceway surface 21.

図２に示すように、保持器４は環状体からなり、ボール３を回転自在に保持するポケット４１を有する。ポケット４１は保持器４の周面を貫通する。ポケット４１の保持器４の軸方向一端面４０が開放されている。つまり、保持器４は冠型保持器である。ポケット４１は保持器４の周方向に八個（複数個、偶数個）形成されている。保持器４の隣り合うポケット４１間の部分（柱部）４２に、軸方向に伸びる貫通穴４３が形成されている。
貫通穴４３の内面は、保持器４の外周側の大径面４３ａと、内周側の小径面４３ｂと、保持器４の径方向に沿う一対の対向面４３ｃ，４３ｄとからなる。貫通穴４３は全ての柱部４２に一つずつ形成されている。保持器４の軸方向他端面に、軸方向に凹む円環状の凹部４４が形成されている。 As shown in FIG. 2, the retainer 4 is formed of an annular body and has a pocket 41 that rotatably holds the ball 3. The pocket 41 penetrates the peripheral surface of the cage 4. One end surface 40 in the axial direction of the cage 4 of the pocket 41 is opened. That is, the cage 4 is a crown type cage. Eight (a plurality, even number) pockets 41 are formed in the circumferential direction of the cage 4. A through hole 43 extending in the axial direction is formed in a portion (column portion) 42 between adjacent pockets 41 of the cage 4.
The inner surface of the through hole 43 includes a large-diameter surface 43 a on the outer peripheral side of the cage 4, a small-diameter surface 43 b on the inner peripheral side, and a pair of opposing surfaces 43 c and 43 d along the radial direction of the cage 4. One through hole 43 is formed in each of the column portions 42. An annular recess 44 that is recessed in the axial direction is formed on the other axial end surface of the cage 4.

磁石５は、ネオジム磁石であり、全ての貫通穴４３に一つずつ、保持器４の軸方向に沿ってＮ極とＳ極が並び、保持器４の周方向で各磁石のＮ極とＳ極が隣り合うように配置されている。磁石５の形状は保持器４の貫通穴４３の内面に対応する形状である。磁石５は、貫通穴４３の大径面４３ａに対応する外面５１と、貫通穴４３の小径面４３ｂに対応する内面５２と、貫通穴４３の一対の対向面４３ｃ，４３ｄに対応する外面５３，５４と、保持器４の軸方向一端面４０側の軸方向一端面５５と、その反対側の面である軸方向他端面５６を有する。 The magnet 5 is a neodymium magnet, and N poles and S poles are arranged along the axial direction of the cage 4 one by one in every through hole 43, and the N poles and S of each magnet are arranged in the circumferential direction of the cage 4. The poles are arranged next to each other. The shape of the magnet 5 is a shape corresponding to the inner surface of the through hole 43 of the cage 4. The magnet 5 includes an outer surface 51 corresponding to the large diameter surface 43 a of the through hole 43, an inner surface 52 corresponding to the small diameter surface 43 b of the through hole 43, and outer surfaces 53 corresponding to the pair of opposed surfaces 43 c and 43 d of the through hole 43. 54, one axial end surface 55 on the axial one end surface 40 side of the cage 4, and the other axial end surface 56 which is the opposite side surface.

磁石５の軸方向一端面５５と軸方向他端面５６との距離（軸方向に沿った寸法）は、保持器４の軸方向寸法より大きい。そのため、図１および図３（ａ）に示すように、貫通穴４３に配置された磁石５は保持器４の軸方向一端面４０から突出している。
図２に示すように、ヨーク６は円環状の金属板であって、保持器４の凹部４４に嵌合する寸法を有する。図１に示すように、ヨーク６は凹部４４に嵌合されて、貫通穴４３に配置された磁石５の軸方向他端面５６に接触している。ヨーク６は電磁鋼等の比透磁率の高い材料で形成されている。 The distance (the dimension along the axial direction) between the axial one end face 55 and the axial other end face 56 of the magnet 5 is larger than the axial dimension of the cage 4. Therefore, as shown in FIG. 1 and FIG. 3A, the magnet 5 arranged in the through hole 43 protrudes from the one end surface 40 in the axial direction of the cage 4.
As shown in FIG. 2, the yoke 6 is an annular metal plate and has a dimension that fits into the recess 44 of the cage 4. As shown in FIG. 1, the yoke 6 is fitted in the recess 44 and is in contact with the other axial end surface 56 of the magnet 5 disposed in the through hole 43. The yoke 6 is made of a material having a high relative permeability such as electromagnetic steel.

磁石５およびヨーク６の劣化を防ぐために、磁石５およびヨーク６の表面をフッ素ゴム被膜またはパリレン（ポリパラキシレンの通称）の蒸着膜で覆うことが好ましい。保持器４は６，６−ナイロン等の非磁性材料で形成されている。保持器４を射出成形で作製する際に、磁石５とヨーク６を金型に配置して一体成形することが好ましい。射出成形された保持器４の貫通穴４３に磁石５を入れて接着し、凹部４４にヨーク６を嵌めて接着してもよい。
第一シール７は、図１に示すように、芯金７１とゴム製のシール部７２とからなる。図１および図３（ｂ）に示すように、第一シール７の芯金７１の内側面（磁石５との対向面）７１ａに、複数個のコイル８と一つの回路基板９が固定されている。芯金７１は電磁鋼等の比透磁率の高い材料で形成されている。芯金７１の内側面７１ａに絶縁膜が形成されている。 In order to prevent deterioration of the magnet 5 and the yoke 6, it is preferable to cover the surfaces of the magnet 5 and the yoke 6 with a fluorine rubber coating or a vapor deposition film of parylene (common name of polyparaxylene). The cage 4 is made of a nonmagnetic material such as 6,6-nylon. When the cage 4 is manufactured by injection molding, it is preferable that the magnet 5 and the yoke 6 are disposed in a mold and integrally molded. The magnet 5 may be put into the through hole 43 of the cage 4 that has been injection-molded and bonded, and the yoke 6 may be fitted into the concave portion 44 and bonded.
As shown in FIG. 1, the first seal 7 includes a core bar 71 and a rubber seal portion 72. As shown in FIGS. 1 and 3B, a plurality of coils 8 and one circuit board 9 are fixed to the inner side surface (the surface facing the magnet 5) 71 a of the core 71 of the first seal 7. Yes. The core metal 71 is made of a material having high relative permeability such as electromagnetic steel. An insulating film is formed on the inner side surface 71 a of the cored bar 71.

コイル８の芯金８１は電磁鋼等の比透磁率の高い材料で形成されている。コイル８と磁石５の相対回転で生じる電磁誘導による発電量を向上させるために、コイル８は、薄膜コイルが積層されたものを使用してもよいし、直径が０．０１ｍｍ以下の金属線が巻かれたものを使用してもよい。
第一シール７は、図１に示すように、シール部７２の内周部を内輪１の周溝１２に配置し、シール部７２の外周部を外輪２のシール取付溝２２に弾性変形状態で嵌め入れることで、内輪１と外輪２との間に設置されている。つまり、第一シール７は外輪２に固定されている。 The cored bar 81 of the coil 8 is formed of a material having a high relative permeability such as electromagnetic steel. In order to improve the amount of power generated by electromagnetic induction generated by the relative rotation of the coil 8 and the magnet 5, the coil 8 may be a laminate of thin film coils, or a metal wire having a diameter of 0.01 mm or less. You may use what was wound.
As shown in FIG. 1, the first seal 7 has an inner peripheral portion of the seal portion 72 disposed in the peripheral groove 12 of the inner ring 1, and an outer peripheral portion of the seal portion 72 is elastically deformed into the seal mounting groove 22 of the outer ring 2. It is installed between the inner ring 1 and the outer ring 2 by fitting. That is, the first seal 7 is fixed to the outer ring 2.

第二シール７Ａは、図１に示すように、芯金７１Ａとゴム製のシール部７２とからなる通常のシールである。第二シール７Ａは、シール部７２の内周部を内輪１の周溝１２に配置し、シール部７２の外周部を外輪２のシール取付溝２２に弾性変形状態で嵌め入れることで、内輪１と外輪２との間に設置されている。つまり、第二シール７Ａは外輪２に固定されている。
回路基板（回路部）９は、図３（ｂ）および図４に示すように、電源回路９１と制御回路９２と無線回路９３とアンテナ９４を有する。制御回路９２上に、加速度センサ、温度センサ、回転センサ、および荷重センサの少なくともいずれかのセンサ９２ａが設けてある。電源回路９１は、電磁誘導でコイル８に生じた電流を、整流、平滑化して、電源供給部（センサ９２ａ、制御回路９２、無線回路９３）へ供給するとともに、蓄電する。そのために、電源回路９１は、整流回路、平滑回路、蓄電回路、蓄電用二次電池、および定電圧出力回路を備えている。 As shown in FIG. 1, the second seal 7 A is a normal seal including a core bar 71 A and a rubber seal portion 72. In the second seal 7A, the inner peripheral portion of the seal portion 72 is disposed in the peripheral groove 12 of the inner ring 1, and the outer peripheral portion of the seal portion 72 is fitted into the seal mounting groove 22 of the outer ring 2 in an elastically deformed state. And the outer ring 2. That is, the second seal 7 A is fixed to the outer ring 2.
The circuit board (circuit unit) 9 includes a power supply circuit 91, a control circuit 92, a radio circuit 93, and an antenna 94, as shown in FIGS. On the control circuit 92, at least one of an acceleration sensor, a temperature sensor, a rotation sensor, and a load sensor 92a is provided. The power supply circuit 91 rectifies and smoothes the current generated in the coil 8 by electromagnetic induction, supplies the power to the power supply unit (the sensor 92a, the control circuit 92, and the wireless circuit 93) and stores the current. For this purpose, the power supply circuit 91 includes a rectifier circuit, a smoothing circuit, a power storage circuit, a secondary battery for power storage, and a constant voltage output circuit.

制御回路（演算回路）９２は、センサ９２ａで検出された情報Ｓ１を演算し、演算結果を示す信号Ｓ２と演算結果の送信周期を示す制御信号Ｓ３を、無線回路９３に出力する。無線回路９３は、制御回路９２からの演算結果を示す信号Ｓ２を、制御信号Ｓ３に従った送信周期で無線信号に変換して、アンテナ９４に出力する。アンテナ９４は、演算結果（センサ９２ａで検出された情報）を示す無線信号を所定周期で、外部に設けた受信端末に無線送信する。
上述のように、第一シール７の芯金７１の内側面７１ａに、複数個のコイル８と一つの回路基板９が固定されているが、さらにその上を保護カバーで覆うことが好ましい。これにより、コイル８、回路基板９、およびアンテナ９４が、軸受内部に充填されたグリースや使用時に生じる摩耗粉で汚染されることが防止できる。 The control circuit (arithmetic circuit) 92 calculates the information S1 detected by the sensor 92a, and outputs a signal S2 indicating the calculation result and a control signal S3 indicating the transmission cycle of the calculation result to the radio circuit 93. The radio circuit 93 converts the signal S2 indicating the calculation result from the control circuit 92 into a radio signal at a transmission cycle according to the control signal S3, and outputs the radio signal to the antenna 94. The antenna 94 wirelessly transmits a wireless signal indicating a calculation result (information detected by the sensor 92a) to a receiving terminal provided outside in a predetermined cycle.
As described above, the plurality of coils 8 and one circuit board 9 are fixed to the inner side surface 71a of the core bar 71 of the first seal 7, and it is preferable to further cover it with a protective cover. Thereby, it can prevent that the coil 8, the circuit board 9, and the antenna 94 are contaminated with the grease with which the inside of the bearing was filled, and the abrasion powder produced at the time of use.

この実施形態のワイヤレスセンサ付き軸受１０は、外輪２をハウジングに固定し、内輪１に軸を嵌合して使用される。この状態で軸を回転させた場合、内輪１が保持器４とともに回転し、外輪２に固定された第一シール７は回転しない（つまり、第一シール７と保持器４は相対回転する）ため、第一シール７に固定されたコイル８と、保持器４に固定された磁石５との間に相対回転が生じる。
これに伴い、コイル８と磁石５との相対回転による磁束密度変化で電磁誘導が生じ、この電磁誘導でコイル８に生じた電流が、電源回路９１で整流、平滑化されて、電源供給部（センサ９２ａ、制御回路９２、無線回路９３）へ供給されるとともに、二次電池に蓄電される。 The bearing 10 with a wireless sensor of this embodiment is used by fixing the outer ring 2 to the housing and fitting the shaft to the inner ring 1. When the shaft is rotated in this state, the inner ring 1 rotates with the cage 4 and the first seal 7 fixed to the outer ring 2 does not rotate (that is, the first seal 7 and the cage 4 rotate relative to each other). The relative rotation occurs between the coil 8 fixed to the first seal 7 and the magnet 5 fixed to the cage 4.
Along with this, electromagnetic induction occurs due to a change in magnetic flux density due to relative rotation between the coil 8 and the magnet 5, and the current generated in the coil 8 by this electromagnetic induction is rectified and smoothed by the power supply circuit 91, and the power supply section ( Sensor 92a, control circuit 92, wireless circuit 93) and charged in the secondary battery.

この供給された電流により、センサ９２ａ、制御回路９２、および無線回路９３が駆動し、制御回路９２で、センサ９２ａで検出された情報Ｓ１が演算され、演算結果を示す信号Ｓ２と演算結果の送信周期を示す制御信号Ｓ３が、無線回路９３に出力される。これに伴い、無線回路９３で、制御回路９２からの演算結果を示す信号Ｓ２が、制御信号Ｓ３に従った送信周期で無線信号に変換されて、アンテナ９４に出力される。その結果、アンテナ９４から、センサ９２ａで検出された情報を示す信号が所定周期で、外部に設けた受信端末に無線送信される。 The supplied current drives the sensor 92a, the control circuit 92, and the wireless circuit 93. The control circuit 92 calculates information S1 detected by the sensor 92a, and transmits a signal S2 indicating the calculation result and the calculation result. A control signal S3 indicating the cycle is output to the radio circuit 93. Accordingly, the radio circuit 93 converts the signal S2 indicating the calculation result from the control circuit 92 into a radio signal at a transmission cycle according to the control signal S3 and outputs the radio signal to the antenna 94. As a result, a signal indicating information detected by the sensor 92a is wirelessly transmitted from the antenna 94 to a receiving terminal provided outside in a predetermined cycle.

この実施形態のワイヤレスセンサ付き軸受１０は、既存の転がり軸受の内輪１および外輪２に対する新たな加工が不要である。また、既存の転がり軸受では二つ使用されている第二シール７Ａのうちの一つを、コイル８と回路基板９が固定された第一シール７に交換するとともに、既存の転がり軸受で使用されている冠型保持器を磁石５付きの保持器４に交換することで簡単に得られる。
また、この実施形態のワイヤレスセンサ付き軸受１０は、コイル８と磁石５と間の電磁誘導で発電を行うため、熱発電素子であるゼーベック素子や振動発電素子であるエレクトレット素子を用いた発電を行うワイヤレスセンサ付き軸受では発電が困難であった、振動の少ない使用初期や、低速回転時であっても、必要な電力が得られてセンサ機能が発揮できる。 The bearing 10 with a wireless sensor of this embodiment does not require new processing for the inner ring 1 and the outer ring 2 of the existing rolling bearing. Further, one of the two second seals 7A used in the existing rolling bearing is replaced with the first seal 7 to which the coil 8 and the circuit board 9 are fixed, and is used in the existing rolling bearing. It can be easily obtained by replacing the existing crown-shaped cage with the cage 4 with the magnet 5.
Moreover, since the bearing 10 with a wireless sensor of this embodiment produces electric power by the electromagnetic induction between the coil 8 and the magnet 5, it produces electric power using the Seebeck element which is a thermoelectric generation element, and the electret element which is a vibration electric power generation element. Power generation is difficult with a bearing with a wireless sensor, and even in the initial stage of use with little vibration or during low-speed rotation, the necessary power can be obtained and the sensor function can be exhibited.

また、第一シール７にコイル８と回路基板９を固定するとともに、保持器４の柱部４２に貫通穴４３を設けて、この貫通穴４３に配置した磁石５を第一シール７側に突出させているため、既存の転がり軸受と比較した軸受内部空間の低下量は少ない。
また、磁石５の大部分が保持器４に埋め込まれた構造となっているため、コイル８に対して垂直磁場変化の強い磁石を使用することが可能となる。その結果、磁石の埋め込み量が少ない構造のものと比較して発電効率が高くなる。
また、この実施形態のワイヤレスセンサ付き軸受１０は、回路基板９が、演算結果を示す信号をアンテナ９４が所定周期で、外部に設けた受信端末に無線送信するように構成されている。これにより、演算時および無線送信時以外には無線回路９３およびアンテナ９４が作動しないため、常時作動するように構成されているものと比較して、消費電力が低減できる。 In addition, the coil 8 and the circuit board 9 are fixed to the first seal 7, and a through hole 43 is provided in the column portion 42 of the cage 4, and the magnet 5 disposed in the through hole 43 protrudes toward the first seal 7 side. Therefore, the amount of decrease in the bearing internal space compared to existing rolling bearings is small.
In addition, since most of the magnet 5 is embedded in the cage 4, it is possible to use a magnet having a strong vertical magnetic field change with respect to the coil 8. As a result, the power generation efficiency is higher than that of a structure having a small magnet embedding amount.
Further, the bearing 10 with a wireless sensor of this embodiment is configured such that the circuit board 9 wirelessly transmits a signal indicating a calculation result to a receiving terminal provided outside at a predetermined cycle. Thereby, since the radio circuit 93 and the antenna 94 do not operate except at the time of calculation and at the time of radio transmission, power consumption can be reduced as compared with a configuration configured to always operate.

なお、この実施形態のワイヤレスセンサ付き軸受１０では、アンテナ９４が回路基板９の部品実装面に形成されているが、回路基板９の部品実装面とは反対面にアンテナを形成し、芯金７１とシール部７２に穴を設けて、アンテナを第一シール７から軸受外部に突出させてもよい。
また、この実施形態のワイヤレスセンサ付き軸受１０では、一つの回路基板９に、電源回路９１と制御回路９２と無線回路９３とアンテナ９４が形成され、その回路基板９が芯金７１に固定されているが、電源回路９１と制御回路９２と無線回路９３とアンテナ９４が別々の基板に形成されていてもよい。さらに、電源回路９１と制御回路９２と無線回路９３とアンテナ９４は、芯金７１の内側面７１ａに形成された絶縁膜上に直接形成されていてもよい。 In the wireless sensor-equipped bearing 10 of this embodiment, the antenna 94 is formed on the component mounting surface of the circuit board 9. However, the antenna is formed on the surface opposite to the component mounting surface of the circuit board 9, and the cored bar 71 is formed. A hole may be provided in the seal portion 72 so that the antenna protrudes from the first seal 7 to the outside of the bearing.
Moreover, in the bearing 10 with a wireless sensor of this embodiment, the power circuit 91, the control circuit 92, the radio circuit 93, and the antenna 94 are formed on one circuit board 9, and the circuit board 9 is fixed to the cored bar 71. However, the power supply circuit 91, the control circuit 92, the radio circuit 93, and the antenna 94 may be formed on different substrates. Further, the power supply circuit 91, the control circuit 92, the radio circuit 93, and the antenna 94 may be directly formed on the insulating film formed on the inner side surface 71 a of the cored bar 71.

また、この実施形態のワイヤレスセンサ付き軸受１０では、センサが制御回路９２上に（つまり、第一シール７の芯金７１に）形成されているため、既存の転がり軸受を構成する内輪１および外輪２に対する新たな加工が不要であり、外部に突起物が存在しない。
しかし、第一シール７が固定されている外輪２の軸方向端面、外周面、および内周面の少なくともいずれかの面に、センサを固定していもよい。第一シール７が内輪に固定されている場合は、内輪の軸方向端面、外周面、および内周面の少なくともいずれかの面にセンサを固定していもよい。また、上記いずれかの面に、センサを固定するための凹部を設けてもよい。 Moreover, in the bearing 10 with a wireless sensor of this embodiment, since the sensor is formed on the control circuit 92 (that is, on the metal core 71 of the first seal 7), the inner ring 1 and the outer ring constituting the existing rolling bearing. No new processing is required for 2 and there are no protrusions on the outside.
However, the sensor may be fixed to at least one of the axial end surface, outer peripheral surface, and inner peripheral surface of the outer ring 2 to which the first seal 7 is fixed. When the first seal 7 is fixed to the inner ring, the sensor may be fixed to at least one of the axial end face, the outer peripheral surface, and the inner peripheral surface of the inner ring. Moreover, you may provide the recessed part for fixing a sensor in any said surface.

また、この実施形態のワイヤレスセンサ付き軸受１０では、磁石５として、ネオジム磁石を使用しているが、サマリウムコバルト磁石等の他の磁石を使用してもよい。
また、この実施形態のワイヤレスセンサ付き軸受１０では、磁石５が保持器４の軸方向一端面４０から突出しているが、磁石５の軸方向一端面５５が保持器４の軸方向一端面４０と同じかこれより内側になっていてもよい。さらに、磁石５の軸方向一端面５５を保持器４の軸方向一端面４０より内側とし、保持器４を合成樹脂の射出成形で作製する際に、軸方向一端面５５が合成樹脂で薄く覆われるように磁石５を一体成形してもよい。
つまり、複数個の磁石５は、環状体である保持器４の周方向で各磁石のＮ極とＳ極が隣り合うように固定され、コイル８と磁石５と間で電磁誘導が生じる状態となっていればよい。なお、合成樹脂で磁石５の軸方向一端面５５が覆われている場合は、磁石５は合成樹脂製被覆部を介してコイル８と対向する。 Moreover, in the bearing 10 with a wireless sensor of this embodiment, although the neodymium magnet is used as the magnet 5, other magnets, such as a samarium cobalt magnet, may be used.
Moreover, in the bearing 10 with a wireless sensor of this embodiment, although the magnet 5 protrudes from the axial direction one end surface 40 of the holder | retainer 4, the axial direction one end surface 55 of the magnet 5 and the axial direction one end surface 40 of the holder | retainer 4 are. It may be the same or inside. Further, when one end surface 55 in the axial direction of the magnet 5 is located inside the one end surface 40 in the axial direction of the cage 4 and the cage 4 is manufactured by synthetic resin injection molding, the one end surface 55 in the axial direction is thinly covered with the synthetic resin. As shown, the magnet 5 may be integrally formed.
That is, the plurality of magnets 5 are fixed so that the N pole and the S pole of each magnet are adjacent to each other in the circumferential direction of the cage 4 which is an annular body, and electromagnetic induction occurs between the coil 8 and the magnet 5. It only has to be. In addition, when the axial direction one end surface 55 of the magnet 5 is covered with synthetic resin, the magnet 5 opposes the coil 8 through the synthetic resin coating part.

［第二実施形態］
図５に示すように、第二実施形態のワイヤレスセンサ付き軸受１０Ａは、内輪１、外輪２、ボール（転動体）３と、保持器４Ａと、磁石５Ａと、ヨーク６と、第一シール７と、第二シール７Ａを有する。このワイヤレスセンサ付き軸受１０Ａは、保持器４Ａおよび磁石５Ａの形状を除いて、第一実施形態のワイヤレスセンサ付き軸受１０と同じである。
保持器４Ａの隣り合うポケット間の部分（柱部）４２に、軸方向一端面４０から軸方向に凹む凹部４５が形成されている。凹部４５は、全ての柱部４２に一つずつ形成されている。つまり、保持器４Ａは、第一実施形態の保持器４の貫通穴４３の代わりに凹部４５を有する。これ以外の点において、保持器４Ａは第一実施形態の保持器４と同じである。 [Second Embodiment]
As shown in FIG. 5, the bearing 10A with a wireless sensor of the second embodiment includes an inner ring 1, an outer ring 2, a ball (rolling element) 3, a cage 4A, a magnet 5A, a yoke 6, and a first seal 7. And a second seal 7A. This bearing 10A with a wireless sensor is the same as the bearing 10 with a wireless sensor of the first embodiment except for the shapes of the cage 4A and the magnet 5A.
A concave portion 45 that is recessed in the axial direction from the axial one end surface 40 is formed in a portion (column portion) 42 between adjacent pockets of the cage 4A. One recess 45 is formed in each column 42. That is, the cage 4A has a recess 45 instead of the through hole 43 of the cage 4 of the first embodiment. In other respects, the cage 4A is the same as the cage 4 of the first embodiment.

磁石５Ａは、全ての凹部４５に一つずつ、保持器４Ａの周方向でＮ極とＳ極が隣り合うように配置されている。磁石５Ａは、保持器４Ａの凹部４５内に配置される基部５７と、保持器４Ａの軸方向一端面４０から突出する突出部５８とを有する。基部５７は突出部５８より薄く、両部分の境界に段部を有する。
基部５７の形状は保持器４Ａの凹部４５の内面に対応する形状である。つまり、基部５７は、凹部４５の大径面４５ａに対応する外面、凹部４５の小径面４５ｂに対応する内面等を有する。突出部５８は、保持器４の軸方向一端面４０側の軸方向一端面５５を有する。基部５７は、軸方向一端面５５の反対側の面である軸方向他端面５６を有する。
磁石５Ａの基部５７を保持器４Ａの凹部４５に入れ、凹部４４にヨーク６を嵌めることで、凹部４５の底板４６を介して基部５７とヨーク６が引き合う。そのため、この実施形態のワイヤレスセンサ付き軸受１０Ａでは、接着剤を用いずに、磁石５Ａおよびヨーク６を保持器４Ａに固定することができる。 One magnet 5 A is arranged in each concave portion 45 so that the N pole and the S pole are adjacent to each other in the circumferential direction of the cage 4 A. The magnet 5A has a base portion 57 disposed in the concave portion 45 of the cage 4A, and a projecting portion 58 that projects from the one axial end surface 40 of the cage 4A. The base part 57 is thinner than the protrusion part 58, and has a step part at the boundary of both parts.
The shape of the base 57 is a shape corresponding to the inner surface of the recess 45 of the cage 4A. That is, the base 57 has an outer surface corresponding to the large diameter surface 45a of the recess 45, an inner surface corresponding to the small diameter surface 45b of the recess 45, and the like. The protrusion 58 has an axial end surface 55 on the axial end surface 40 side of the cage 4. The base 57 has an axial other end surface 56 that is a surface opposite to the axial one end surface 55.
The base 57 of the magnet 5 A is put into the recess 45 of the retainer 4 A and the yoke 6 is fitted into the recess 44, whereby the base 57 and the yoke 6 are attracted via the bottom plate 46 of the recess 45. Therefore, in the bearing 10A with a wireless sensor of this embodiment, the magnet 5A and the yoke 6 can be fixed to the cage 4A without using an adhesive.

［第三実施形態］
図６に示すように、第三実施形態のワイヤレスセンサ付き軸受１０Ｂは、内輪１、外輪２、ボール（転動体）３と、保持器４Ｂと、磁石５Ｂと、ヨーク６と、第一シール７と、第二シール７Ａを有する。このワイヤレスセンサ付き軸受１０Ｂは、保持器４Ｂおよび磁石５Ｂの形状と、ヨーク６の固定位置を除いて、第一実施形態のワイヤレスセンサ付き軸受１０と同じである。
磁石５Ｂは、保持器４Ｂの軸方向で厚さの異なる基部５９１と突出部５９２からなる。磁石５Ｂの基部５９１は突出部５９２より厚く、両部分の境界に段部を有する。 [Third embodiment]
As shown in FIG. 6, the bearing 10B with the wireless sensor of the third embodiment includes an inner ring 1, an outer ring 2, a ball (rolling element) 3, a cage 4B, a magnet 5B, a yoke 6, and a first seal 7. And a second seal 7A. This bearing 10B with a wireless sensor is the same as the bearing 10 with a wireless sensor of the first embodiment except for the shape of the cage 4B and the magnet 5B and the fixing position of the yoke 6.
The magnet 5B includes a base portion 591 and a protruding portion 592 having different thicknesses in the axial direction of the cage 4B. The base 591 of the magnet 5B is thicker than the protrusion 592 and has a step at the boundary between the two parts.

このワイヤレスセンサ付き軸受１０Ｂでは、保持器４Ｂを射出成形で作製する際に、磁石５Ｂとヨーク６を金型に配置して一体成形を行っている。これにより、磁石５Ｂが、保持器４Ｂの隣り合うポケット間の部分（柱部）４２に一つずつ、保持器４Ｂの周方向でＮ極とＳ極が隣り合うように配置されている。
磁石５Ｂの突出部５９２は、段部側の部分を除いて、保持器４Ｂの軸方向一端面４０から突出している。磁石５Ｂの基部５９１は全て保持器４Ｂ内に配置されている。磁石５Ｂの軸方向他端面５６にヨーク６が接触している。ヨーク６の外側に保持器４Ｂの底部４７が存在する。 In the wireless sensor-equipped bearing 10B, when the cage 4B is manufactured by injection molding, the magnet 5B and the yoke 6 are arranged in a mold and are integrally molded. Thereby, the magnet 5B is arrange | positioned so that the N pole and the S pole may adjoin each other in the part (column part) 42 between the adjacent pockets of the holder | retainer 4B in the circumferential direction of the holder | retainer 4B.
The protruding portion 592 of the magnet 5B protrudes from the axial one end surface 40 of the cage 4B except for the step side portion. The base 591 of the magnet 5B is all disposed in the cage 4B. The yoke 6 is in contact with the other axial end surface 56 of the magnet 5B. The bottom 47 of the cage 4B exists outside the yoke 6.

１内輪
１１内輪軌道面
１２シール配置用の周溝
２外輪
２１外輪軌道面
２２シール取付溝
３ボール（転動体）
４保持器
４Ａ保持器
４Ｂ保持器
４１ポケット
４０保持器の軸方向一端面
４２柱部（ポケット間の部分）
４３貫通穴
４４保持器の凹部
５磁石
５Ａ磁石
５Ｂ磁石
６ヨーク
７第一シール
７１第一シールの芯金
７１ａ第一シールの芯金の内側面（磁石との対向面）
７２シール部
７Ａ第二シール
７１Ａ第二シールの芯金
８コイル
９回路基板（回路部）
９１電源回路
９２制御回路（演算回路、電源供給部）
９３無線回路（電源供給部）
９４アンテナ
９２ａセンサ（電源供給部）
１０ワイヤレスセンサ付き軸受 DESCRIPTION OF SYMBOLS 1 Inner ring 11 Inner ring raceway surface 12 Circumferential groove for seal arrangement 2 Outer ring 21 Outer ring raceway surface 22 Seal mounting groove 3 Ball (rolling element)
4 Cage 4A Cage 4B Cage 41 Pocket 40 One end surface in the axial direction of the cage 42 Column (portion between pockets)
43 Through hole 44 Recessed portion of cage 5 Magnet 5A Magnet 5B Magnet 6 Yoke 7 First seal 71 Core metal of first seal 71a Inner side surface of core metal of first seal (opposite surface to magnet)
72 seal part 7A second seal 71A core metal of second seal 8 coil 9 circuit board (circuit part)
91 power supply circuit 92 control circuit (arithmetic circuit, power supply unit)
93 Radio circuit (power supply unit)
94 Antenna 92a Sensor (Power supply unit)
10 Bearing with wireless sensor

Claims

An inner ring having an inner ring raceway surface on the outer peripheral surface;
An outer ring having, on the inner peripheral surface, an outer ring raceway surface disposed opposite to the inner ring raceway surface;
A rolling element disposed on a track formed by the inner ring raceway surface and the outer ring raceway surface;
A cage made of an annular body, having a pocket for rotatably holding the rolling element, wherein the pocket penetrates the circumferential surface of the annular body, and a plurality of pockets are formed in the circumferential direction of the annular body A cage in which a through hole extending in the axial direction is formed in a portion between the adjacent pockets ;
A plurality of magnets, one by one in the through-hole of the cage, and fixed so that the north and south poles of each magnet are adjacent to each other in the circumferential direction of the annular body;
A first seal that seals between the inner ring and the outer ring at one axial end, and a first seal that rotates relative to the cage;
A coil fixed to a surface of the first seal facing the magnet;
A second seal that seals between the inner ring and the outer ring at the other axial end;
A sensor installed on any of the inner ring, the outer ring, and the first seal;
A circuit unit formed on the first seal, the power source circuit supplying current generated in the coil to the power supply unit by electromagnetic induction caused by relative rotation between the magnet and the coil, and detected by the sensor A circuit unit having an arithmetic circuit for calculating a detection value from detection information, and a radio circuit for creating a radio signal indicating a calculation result;
A wireless sensor-equipped bearing having an antenna for transmitting the radio signal, the antenna being fixed to the first seal.

An inner ring having an inner ring raceway surface on the outer peripheral surface;
An outer ring having, on the inner peripheral surface, an outer ring raceway surface disposed opposite to the inner ring raceway surface;
A rolling element disposed on a track formed by the inner ring raceway surface and the outer ring raceway surface;
A cage made of an annular body, having a pocket for rotatably holding the rolling element, wherein the pocket penetrates the circumferential surface of the annular body, and a plurality of pockets are formed in the circumferential direction of the annular body And a cage in which a recess recessed in the axial direction from one axial end surface is formed in a portion between the adjacent pockets , and
A plurality of magnets, each fixed to the concave portion of the cage, such that the N pole and S pole of each magnet are adjacent to each other in the circumferential direction of the annular body;
A first seal that seals between the inner ring and the outer ring at one axial end, and a first seal that rotates relative to the cage;
A coil fixed to a surface of the first seal facing the magnet;
A second seal that seals between the inner ring and the outer ring at the other axial end;
A sensor installed on any of the inner ring, the outer ring, and the first seal;
A circuit unit formed on the first seal, the power source circuit supplying current generated in the coil to the power supply unit by electromagnetic induction caused by relative rotation between the magnet and the coil, and detected by the sensor A circuit unit having an arithmetic circuit for calculating a detection value from detection information, and a radio circuit for creating a radio signal indicating a calculation result;
A wireless sensor-equipped bearing having an antenna for transmitting the radio signal, the antenna being fixed to the first seal.

An inner ring having an inner ring raceway surface on the outer peripheral surface;
An outer ring having, on the inner peripheral surface, an outer ring raceway surface disposed opposite to the inner ring raceway surface;
A rolling element disposed on a track formed by the inner ring raceway surface and the outer ring raceway surface;
A cage made of an annular body, having a pocket for rotatably holding the rolling element, wherein the pocket penetrates the circumferential surface of the annular body, and a plurality of pockets are formed in the circumferential direction of the annular body A cage,
A plurality of magnets, each of which is fixed between the adjacent pockets of the cage so that the N pole and S pole of each magnet are adjacent to each other in the circumferential direction of the annular body;
A first seal that seals between the inner ring and the outer ring at one axial end, and a first seal that rotates relative to the cage;
A coil fixed to a surface of the first seal facing the magnet;
A second seal that seals between the inner ring and the outer ring at the other axial end;
A yoke made of an annular metal plate and disposed on the other axial end side in the cage;
A sensor installed on any of the inner ring, the outer ring, and the first seal;
A circuit unit formed on the first seal, the power source circuit supplying current generated in the coil to the power supply unit by electromagnetic induction caused by relative rotation between the magnet and the coil, and detected by the sensor A circuit unit having an arithmetic circuit for calculating a detection value from detection information, and a radio circuit for creating a radio signal indicating a calculation result;
Wherein an antenna for transmitting a radio signal, have a, an antenna fixed to the first seal,
A bearing with a wireless sensor , wherein the yoke is in contact with an axial end surface of the magnet, and the yoke exists between a bottom portion of the cage and the magnet .

The bearing with a wireless sensor according to any one of claims 1 to 3, wherein the cage is a crown type cage in which one end surface in the axial direction of the annular body of the pocket is open.