JP2012042319A - Method and device for measuring load distribution of rolling bearing with strain sensor mounted on inner ring - Google Patents
Method and device for measuring load distribution of rolling bearing with strain sensor mounted on inner ring Download PDFInfo
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- JP2012042319A JP2012042319A JP2010183537A JP2010183537A JP2012042319A JP 2012042319 A JP2012042319 A JP 2012042319A JP 2010183537 A JP2010183537 A JP 2010183537A JP 2010183537 A JP2010183537 A JP 2010183537A JP 2012042319 A JP2012042319 A JP 2012042319A
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- inner ring
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- optical fiber
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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
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/52—Bearings with rolling contact, for exclusively rotary movement with devices affected by abnormal or undesired conditions
- F16C19/522—Bearings with rolling contact, for exclusively rotary movement with devices affected by abnormal or undesired conditions related to load on the bearing, e.g. bearings with load sensors or means to protect the bearing against overload
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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
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
- F16C19/24—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for radial load mainly
- F16C19/26—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for radial load mainly with a single row of rollers
Abstract
Description
本発明は、外輪が固定され内輪が回転して使用される転がり軸受における、内輪へのひずみセンサ内蔵型転がり軸受の荷重分布測定方法及びその装置に係り、特に、転がり軸受の内輪内に光ファイバに装備されるひずみセンサ部を配置し、その位置を転動体が通過する際のひずみを検出することで、軸受全体の荷重分布を求めるようにしたものである。 The present invention relates to a load distribution measuring method and apparatus for a strain bearing with a built-in strain sensor in an inner ring in a rolling bearing that is used with an outer ring fixed and an inner ring rotated, and in particular, an optical fiber in the inner ring of the rolling bearing. The strain sensor part equipped in is arranged, and the load distribution of the entire bearing is obtained by detecting the strain when the rolling element passes through the position.
図７は従来の転がり軸受の荷重分布測定装置の転動体内への光ファイバ及びひずみセンサ部の取り付け部を示す図である。
この図において、１０１は回転軸、１０２は回転軸１０１に固定される転がり軸受の内輪、１０３は転がり軸受の転動体、１０４は転がり軸受の外輪、１０５は転がり軸受の転動体１０３内に形成される細穴、１０６はその細穴１０５に挿入される光ファイバ、１０７は光ファイバ１０６内に装備されるひずみセンサ部である。
FIG. 7 is a view showing an attachment portion of an optical fiber and a strain sensor part in a rolling body of a conventional load distribution measuring device for a rolling bearing.
In this figure, 101 is a rotating shaft, 102 is an inner ring of a rolling bearing fixed to the rotating shaft 101, 103 is a rolling element of the rolling bearing, 104 is an outer ring of the rolling bearing, and 105 is formed in the rolling element 103 of the rolling bearing. A thin hole 106, an optical fiber inserted into the thin hole 105, and a strain sensor 107 provided in the optical fiber 106.
このように、転がり軸受の転動体１０３の軸中心に、放電加工により細穴１０５を設ける。その細穴１０５にひずみセンサ部１０７を装備する光ファイバ１０６を挿入し接着することにより、転動体１０３に発生するひずみを検出し、軸受全体の荷重分布を求めるようにしたものが本願発明者らによって提案されている（下記特許文献１参照）。
また、本願発明者らによって、内輪へのひずみセンサ内蔵型転がり軸受の荷重分布測定方法及びその装置が提案されている（下記特許文献２参照）。
In this way, the narrow hole 105 is provided by electric discharge machining at the center of the rolling element 103 of the rolling bearing. The inventors of the present application have detected the strain generated in the rolling element 103 by inserting and bonding the optical fiber 106 equipped with the strain sensor portion 107 into the narrow hole 105 and obtaining the load distribution of the entire bearing. (See Patent Document 1 below).
Further, the inventors of the present application have proposed a load distribution measuring method and apparatus for a rolling bearing with a built-in strain sensor on the inner ring (see Patent Document 2 below).
図８は従来の内輪へのひずみセンサ内蔵型転がり軸受の荷重分布測定装置を示す図である。
この図において、２０１は回転軸、２０２は回転軸２０１に固定される転がり軸受の回転する内輪、２０２Ａは内輪２０２の軸方向に形成される細穴、２０３はこの内輪２０２内の細穴２０２Ａに挿入される光ファイバ、２０３′はロータリージョイント２０８とひずみ計測器２０９との間に配置される光ファイバ、２０４は光ファイバ２０３内に装備されるひずみセンサ部、２０５は自転と公転を行う転動体、２０６はハウジングに固定される外輪、２０７はロータリージョイント２０８の支持体、２１０はＬＡＮケーブル、２１１はパーソナルコンピュータ（ＰＣ）である。
FIG. 8 is a diagram showing a conventional load distribution measuring device for a rolling bearing with a built-in strain sensor on an inner ring.
In this figure, 201 is a rotating shaft, 202 is a rotating inner ring of a rolling bearing fixed to the rotating shaft 201, 202A is a narrow hole formed in the axial direction of the inner ring 202, and 203 is a narrow hole 202A in the inner ring 202. An optical fiber to be inserted, 203 ′ is an optical fiber disposed between the rotary joint 208 and the strain measuring instrument 209, 204 is a strain sensor unit provided in the optical fiber 203, and 205 is a rolling element that rotates and revolves. 206, an outer ring fixed to the housing, 207 a support for the rotary joint 208, 210 a LAN cable, and 211 a personal computer (PC).
ひずみセンサ部２０４は内輪２０２の軸方向に形成された細穴２０２Ａ内の軸方向に配置され、光ファイバ２０３，２０３′によって、回転軸２０１に固定された支持体２０７に支持される単一のロータリージョイント２０８を介してひずみ計測器２０９に接続されている。このひずみ計測器２０９にはＬＡＮケーブル２１０などを介してＰＣ２１１が接続されている。 The strain sensor unit 204 is arranged in the axial direction in a narrow hole 202A formed in the axial direction of the inner ring 202, and is supported by a single support 207 fixed to the rotating shaft 201 by optical fibers 203 and 203 ′. It is connected to the strain measuring instrument 209 via the rotary joint 208. A PC 211 is connected to the strain measuring instrument 209 via a LAN cable 210 or the like.
しかしながら、上記した特許文献１に開示された転がり軸受の荷重分布測定方法では、自転及び公転を行う転動体１０３内にひずみセンサ部１０７を配置するようにしており、転がり軸受を回転させて動的測定を行う場合、図示しないが、測定装置が複雑になる。特に、転動体１０３の自転と公転にそれぞれ対応するための第１光ファイバロータリージョイントと第２光ファイバロータリージョイントが必要になるといった問題があった。 However, in the rolling bearing load distribution measuring method disclosed in Patent Document 1 described above, the strain sensor unit 107 is arranged in the rolling element 103 that performs rotation and revolution, and the rolling bearing is rotated to dynamically When performing measurement, although not shown, the measurement apparatus becomes complicated. In particular, there has been a problem that a first optical fiber rotary joint and a second optical fiber rotary joint are required to cope with the rotation and revolution of the rolling element 103, respectively.
さらに、上記特許文献２によれば、転がり軸受の回転軸２０１に固定される内輪２０２の軌道面近傍に軸方向に細穴２０２Ａを設け、この細穴２０２Ａにひずみセンサ部２０４を配備する光ファイバ２０３を挿入するようにしているため、転がり軸受の荷重を十分に検出することができず、その荷重分布を精確に測定することができないといった問題があった。 Further, according to Patent Document 2, an optical fiber is provided in which a narrow hole 202A is provided in the axial direction in the vicinity of the raceway surface of the inner ring 202 fixed to the rotating shaft 201 of the rolling bearing, and the strain sensor unit 204 is provided in the narrow hole 202A. Since 203 is inserted, there is a problem that the load of the rolling bearing cannot be sufficiently detected and the load distribution cannot be measured accurately.
本発明は、上記状況に鑑みて、簡単な構成の測定装置で転がり軸受の荷重分布を精確に求めることができる、内輪へのひずみセンサ内蔵型転がり軸受の荷重分布測定方法及びその装置を提供することを目的とする。 In view of the above situation, the present invention provides a load distribution measuring method and apparatus for a rolling bearing with a built-in strain sensor in an inner ring, which can accurately determine the load distribution of the rolling bearing with a measuring device having a simple configuration. For the purpose.
本発明は、上記目的を達成するために、
〔１〕内輪へのひずみセンサ内蔵型転がり軸受の荷重分布測定方法において、外輪が固定され内輪が回転する転がり軸受であって、この転がり軸受の回転軸に固定される前記内輪の軌道面近傍に円周方向に細穴を設け、この細穴内にひずみセンサ部を装備する光ファイバを挿入し、かつ前記内輪のひずみセンサ部が配置される位置の中心側に切欠溝を形成し、前記内輪とこの内輪の外方に配置される前記外輪との間に転動体を備え、前記ひずみセンサ部からの出力信号を前記光ファイバで導出し、前記回転軸の軸方向に配置され、前記回転軸に固定される支持体に支持される単一のロータリージョイントを介してひずみ計測器に光ファイバを接続し、前記転がり軸受を回転させて前記ひずみセンサ部の位置を前記転動体が通過する際のひずみを検出することを特徴とする。
In order to achieve the above object, the present invention provides
[1] In a load distribution measuring method of a strain sensor built-in type rolling bearing to an inner ring, a rolling bearing in which an outer ring is fixed and an inner ring rotates, and is located near a raceway surface of the inner ring fixed to a rotating shaft of the rolling bearing. A narrow hole is provided in the circumferential direction, an optical fiber equipped with a strain sensor portion is inserted into the narrow hole, and a notch groove is formed on the center side of the position where the strain sensor portion of the inner ring is disposed. A rolling element is provided between the inner ring and the outer ring, and an output signal from the strain sensor unit is derived by the optical fiber, arranged in the axial direction of the rotating shaft, and connected to the rotating shaft. An optical fiber is connected to a strain measuring instrument through a single rotary joint supported by a fixed support, the rolling bearing is rotated, and the strain when the rolling element passes through the position of the strain sensor unit. And detecting.
〔２〕内輪へのひずみセンサ内蔵型転がり軸受の荷重分布測定装置において、外輪が固定され内輪が回転する転がり軸受であって、回転軸に固定される前記転がり軸受の内輪と、この内輪の円周方向に形成される細穴内に配置される光ファイバと、この光ファイバに装備されるひずみセンサ部と、前記内輪のひずみセンサ部が配置される位置の中心側に形成される切欠溝と、前記内輪とこの内輪の外方に配置される外輪との間に配置される転動体と、前記回転軸の軸方向に配置され、前記回転軸に固定される支持体に支持される単一のロータリージョイントと、このロータリージョイントを介して光ファイバにより接続されるひずみ計測器とを備え、前記転がり軸受を回転させて前記ひずみセンサ部の位置を前記転動体が通過する際のひずみを検出することを特徴とする。 [2] In a load distribution measuring apparatus for a rolling bearing with a built-in strain sensor on an inner ring, the rolling ring is a rolling bearing in which an outer ring is fixed and an inner ring rotates, and the inner ring of the rolling bearing fixed to a rotating shaft, An optical fiber disposed in a narrow hole formed in the circumferential direction, a strain sensor portion equipped in the optical fiber, a notch groove formed on the center side of the position where the strain sensor portion of the inner ring is disposed, A rolling element disposed between the inner ring and an outer ring disposed outside the inner ring, and a single member supported by a support body disposed in the axial direction of the rotating shaft and fixed to the rotating shaft. A rotary joint and a strain measuring instrument connected by an optical fiber via the rotary joint, and the strain when the rolling element passes through the position of the strain sensor by rotating the rolling bearing. And detecting.
〔３〕上記〔２〕記載の内輪へのひずみセンサ内蔵型転がり軸受の荷重分布測定装置において、前記ひずみセンサ部としてファイバ・ブラッグ・グレーティング方式の光ファイバひずみセンサ（ＦＢＧセンサ）を用いることを特徴とする。
〔４〕上記〔２〕記載の内輪へのひずみセンサ内蔵型転がり軸受の荷重分布測定装置において、前記光ファイバひずみセンサとしてファブリ・ペロー干渉型のひずみセンサを用いることを特徴とする。
[3] In the load distribution measuring apparatus for a rolling bearing with a built-in strain sensor to the inner ring described in [2] above, a fiber Bragg grating type optical fiber strain sensor (FBG sensor) is used as the strain sensor section. And
[4] In the load distribution measuring apparatus for a rolling bearing with a built-in strain sensor in the inner ring described in [2], a Fabry-Perot interference type strain sensor is used as the optical fiber strain sensor.
本発明によれば、簡単な構成の測定装置で、精確な転がり軸受の荷重分布を求めることができる。 According to the present invention, an accurate load distribution of a rolling bearing can be obtained with a measuring device having a simple configuration.
本発明の内輪へのひずみセンサ内蔵型転がり軸受の荷重分布測定方法は、外輪が固定され内輪が回転する転がり軸受であって、この転がり軸受の回転軸に固定される前記内輪の軌道面近傍に円周方向に細穴を設け、この細穴内にひずみセンサ部を装備する光ファイバを挿入し、かつ前記内輪のひずみセンサ部が配置される位置の中心側に切欠溝を形成し、前記内輪とこの内輪の外方に配置される前記外輪との間に転動体を備え、前記ひずみセンサ部からの出力信号を前記光ファイバで導出し、前記回転軸の軸方向に配置され、前記回転軸に固定される支持体に支持される単一のロータリージョイントを介してひずみ計測器に光ファイバを接続し、前記転がり軸受を回転させて前記ひずみセンサ部の位置を前記転動体が通過する際のひずみを検出する。 The load distribution measuring method of the strain sensor built-in type rolling bearing for the inner ring according to the present invention is a rolling bearing in which the outer ring is fixed and the inner ring rotates, and in the vicinity of the raceway surface of the inner ring fixed to the rotating shaft of the rolling bearing A narrow hole is provided in the circumferential direction, an optical fiber equipped with a strain sensor portion is inserted into the narrow hole, and a notch groove is formed on the center side of the position where the strain sensor portion of the inner ring is disposed. A rolling element is provided between the inner ring and the outer ring, and an output signal from the strain sensor unit is derived by the optical fiber, arranged in the axial direction of the rotating shaft, and connected to the rotating shaft. An optical fiber is connected to a strain measuring instrument through a single rotary joint supported by a fixed support, the rolling bearing is rotated, and the strain when the rolling element passes through the position of the strain sensor unit. Inspect To.
以下、本発明の実施の形態について詳細に説明する。
図１は本発明の実施例を示す内輪へのひずみセンサ内蔵型転がり軸受の荷重分布測定装置におけるひずみセンサ部を装備した光ファイバの取り付け部を示す模式図であり、図１（ａ）は全体構成図、図１（ｂ）は図１（ａ）のＡ部拡大図、図２はその転がり軸受の荷重分布測定装置の全体図、図３はそのひずみセンサ内蔵型転がり軸受の内輪の構成図であり、図３（ａ）はその円周方向断面図〔図３（ｂ）のＣ−Ｃ線断面図〕、図３（ｂ）は図３（ａ）のＢ−Ｂ線断面図、図３（ｃ）は図３（ａ）のＤ−Ｄ線断面図である。
Hereinafter, embodiments of the present invention will be described in detail.
FIG. 1 is a schematic view showing an optical fiber mounting portion equipped with a strain sensor portion in a load distribution measuring device for a rolling bearing with a built-in strain sensor on an inner ring showing an embodiment of the present invention. FIG. Configuration diagram, Fig. 1 (b) is an enlarged view of part A of Fig. 1 (a), Fig. 2 is an overall view of a load distribution measuring device for the rolling bearing, and Fig. 3 is a configuration diagram of an inner ring of the rolling bearing with a built-in strain sensor. FIG. 3A is a circumferential sectional view thereof (a sectional view taken along the line CC of FIG. 3B), and FIG. 3B is a sectional view taken along the line BB of FIG. 3 (c) is a cross-sectional view taken along the line DD of FIG. 3 (a).
これらの図において、１は回転軸、２は回転軸１に固定される転がり軸受の回転する内輪、２Ａは内輪２の円周方向に形成される細穴、２Ａ′はその細穴２Ａから斜めに内輪側面に至る部分に設けられる、光ファイバを外に取り出すために形成される光ファイバ取り出し用細穴、２Ｂは内輪２の細穴２Ａの内側に形成される切欠溝、３は内輪２内の細穴２Ａに挿入される光ファイバ、３′はロータリージョイント１１とひずみ計測器１２の間に配置される光ファイバ、４はこの光ファイバ３内に装備されるひずみセンサ部、５は内輪の回転に伴い自転と公転を行う転動体、６はハウジング７に固定される外輪、８は荷重、９は転がり軸受の荷重分布、１０はロータリージョイント１１の支持体、１３はＬＡＮケーブル、１４はパーソナルコンピュータ（ＰＣ）を示している。 In these drawings, 1 is a rotating shaft, 2 is an inner ring that rotates on a rolling bearing fixed to the rotating shaft 1, 2A is a narrow hole formed in the circumferential direction of the inner ring 2, and 2A 'is oblique from the narrow hole 2A. 2B is a notch groove formed inside the narrow hole 2A of the inner ring 2 and 3 is an inner ring 2 inside. An optical fiber 3 'is inserted into the narrow hole 2A of the optical fiber 3' is an optical fiber disposed between the rotary joint 11 and the strain measuring instrument 12, 4 is a strain sensor section provided in the optical fiber 3, and 5 is an inner ring. Rolling elements that rotate and revolve with rotation, 6 is an outer ring fixed to the housing 7, 8 is a load, 9 is a load distribution of the rolling bearing, 10 is a support for the rotary joint 11, 13 is a LAN cable, and 14 is a personal Con It shows the Yuta (PC).
図２に示すように、ひずみセンサ部４は、内輪２の円周方向に形成された細穴２Ａ内に円周方向に配置され、単一のロータリージョイント１１を介して光ファイバ３，３′によってひずみ計測器１２に接続されている。このひずみ計測器１２にはＬＡＮケーブル１３などを介してＰＣ１４が接続されている。
このように構成することにより、内輪２に配置されたひずみセンサ部４からの出力信号を光ファイバ３を介して出力し、この計測された内輪２のひずみからひずみ計測器１２及びＰＣ１４により得られたひずみデータを適切に処理することにより転がり軸受の荷重を求め、その荷重分布９を求めることができる。
As shown in FIG. 2, the strain sensor unit 4 is disposed in the circumferential direction in the narrow hole 2 </ b> A formed in the circumferential direction of the inner ring 2, and is connected to the optical fibers 3, 3 ′ via a single rotary joint 11. Is connected to the strain measuring instrument 12. A PC 14 is connected to the strain measuring instrument 12 via a LAN cable 13 or the like.
With this configuration, an output signal from the strain sensor unit 4 disposed on the inner ring 2 is output via the optical fiber 3 and obtained from the measured strain of the inner ring 2 by the strain measuring instrument 12 and the PC 14. By appropriately processing the strain data, the load of the rolling bearing can be obtained, and the load distribution 9 can be obtained.
なお、ひずみセンサ部４は、内輪２に単列に単独に配置すれば足りるので、ここでは、次に示すようなファイバ・ブラッグ・グレーディング（ＦＢＧ）方式とする。
図４は本発明の内輪へのひずみセンサ内蔵型転がり軸受の荷重分布測定装置のファイバ・ブラッグ・グレーディング方式のひずみセンサ部の模式図である。
図４（ａ）において、ＦＢＧセンサ２１の取付端２１ｂが、光ファイバ２２の先端に光学的に接続されている。このＦＢＧセンサ２１のコア２１ａの中にはｎ個のブラッグ回折格子Ｇ１〜Ｇｎが長手方向に適当な間隔で並ぶように構成されている。ＦＢＧセンサ２１のコア２１ａの左端と光ファイバ２２のコア２２ａの右端とは光学的に接続されている。このようなＦＢＧセンサ２１に、図４（ｂ）に示すような広い帯域の波長の成分を有するレーザー光Ｌ１を光ファイバ２２から入射させると、この入射レーザー光Ｌ１は、ブラッグ回折格子Ｇ１〜Ｇｎ各々の配置間隔値と屈折率値に応じて定まる所定の波長λ0 〔図４（ｃ）参照〕を中心とした狭い帯域の波長λの成分を有するレーザー光として反射され、図４（ａ）に示す反射レーザー光Ｌ２として光ファイバ２２へ戻ってくる。ここで、ＦＢＧセンサ２１にひずみが発生すると、ブラッグ回折格子Ｇ１〜Ｇｎ各々の配置間隔値と屈折率値に変化が生じるので、反射レーザー光Ｌ２の波長帯域は、例えば、図４（ｃ）において破線で示すように、帯域の中心波長であるブラッグ波長がλ0 からλ1 へと変化する。この変化を求めることにより、ＦＢＧセンサ２１のひずみの値を計測することができる。
Note that the strain sensor unit 4 is only required to be arranged in a single row on the inner ring 2, and therefore, here, the fiber Bragg grading (FBG) system as described below is used.
FIG. 4 is a schematic diagram of a strain sensor unit of a fiber Bragg grading system of a load distribution measuring device for a rolling bearing with a built-in strain sensor in an inner ring according to the present invention.
In FIG. 4A, the attachment end 21 b of the FBG sensor 21 is optically connected to the tip of the optical fiber 22. In the core 21a of the FBG sensor 21, n Bragg diffraction gratings G1 to Gn are arranged at appropriate intervals in the longitudinal direction. The left end of the core 21a of the FBG sensor 21 and the right end of the core 22a of the optical fiber 22 are optically connected. When a laser beam L1 having a wide-band wavelength component as shown in FIG. 4B is incident on the FBG sensor 21 from the optical fiber 22, the incident laser beam L1 is transmitted to the Bragg diffraction gratings G1 to Gn. Reflected as a laser beam having a component of a wavelength λ in a narrow band centered on a predetermined wavelength λ 0 (see FIG. 4C) determined according to each arrangement interval value and refractive index value, FIG. It returns to the optical fiber 22 as reflected laser light L2 shown in FIG. Here, when distortion occurs in the FBG sensor 21, since the arrangement interval value and the refractive index value of each of the Bragg diffraction gratings G1 to Gn change, the wavelength band of the reflected laser light L2 is, for example, in FIG. As indicated by the broken line, the Bragg wavelength, which is the center wavelength of the band, changes from λ 0 to λ 1 . By obtaining this change, the strain value of the FBG sensor 21 can be measured.
また、本発明のひずみセンサ部として、ファブリ・ペロー干渉型のひずみセンサを用いるようにしてもよい。
図５は本発明の内輪へのひずみセンサ内蔵型転がり軸受の荷重分布測定装置のファブリ・ペロー干渉型のひずみセンサを用いたひずみセンサ部の模式図である。
ファブリ・ペロー干渉型のひずみセンサ３１は、図５に示すように、略筒状のひずみ受け部材３２を有している。このひずみ受け部材３２の一端である取付端３２ａに光ファイバ３０が挿入され、接着剤３３などによって取り付けられている。略筒状のひずみ受け部材３２は、外部のひずみに対応してひずみ変形可能な材料、例えば、合成樹脂によって形成されている。
Further, a Fabry-Perot interference type strain sensor may be used as the strain sensor section of the present invention.
FIG. 5 is a schematic diagram of a strain sensor unit using a Fabry-Perot interference type strain sensor of a load distribution measuring apparatus for a rolling bearing with a built-in strain sensor in an inner ring according to the present invention.
The Fabry-Perot interference type strain sensor 31 includes a substantially cylindrical strain receiving member 32 as shown in FIG. The optical fiber 30 is inserted into an attachment end 32 a which is one end of the strain receiving member 32 and attached by an adhesive 33 or the like. The substantially cylindrical strain receiving member 32 is formed of a material that can be deformed in accordance with an external strain, for example, a synthetic resin.
また、ファブリ・ペロー干渉型のひずみセンサ３１の内部には、キャビティ長Ｅを挟んで、第１のミラー３４と第２のミラー３５が対向するように配置されている。第１のミラー３４はハーフミラーであり、光ファイバ３０から入射するレーザー光Ｌの一部を反射面３４ａで反射し、一部を通過させるようになっている。また、第２のミラー３５は全反射ミラーであり、第１のミラー３４を通過して入射したレーザー光を反射面３５ａで反射する。 Further, inside the Fabry-Perot interference type strain sensor 31, the first mirror 34 and the second mirror 35 are arranged to face each other with the cavity length E interposed therebetween. The first mirror 34 is a half mirror, and a part of the laser light L incident from the optical fiber 30 is reflected by the reflecting surface 34a and a part thereof is allowed to pass. The second mirror 35 is a total reflection mirror, and reflects the laser light incident through the first mirror 34 by the reflection surface 35a.
このような構成のファブリ・ペロー干渉型のひずみセンサ３１において、ファブリ・ペロー干渉計の原理により、キャビティ長Ｅと、光反射による波長変調は比例する。このため、入射光と反射光の間の波長変調を検出することにより、キャビティ長Ｅを測定することができる。キャビティ長Ｅは、略筒状のひずみ受け部材３２のひずみ変化に応じて変化するので、キャビティ長Ｅの変化を求めることにより、ひずみ値を計測することができる。 In the Fabry-Perot interferometric strain sensor 31 having such a configuration, the cavity length E is proportional to the wavelength modulation due to light reflection based on the principle of the Fabry-Perot interferometer. For this reason, the cavity length E can be measured by detecting the wavelength modulation between the incident light and the reflected light. Since the cavity length E changes according to the strain change of the substantially cylindrical strain receiving member 32, the strain value can be measured by obtaining the change of the cavity length E.
さらに、図示しないが、軸受を複列に配置し、その内輪のそれぞれに光ファイバひずみセンサとしてＦＢＧセンサあるいはファブリ・ペロー干渉型のひずみセンサを配置することにより、複数本の光ファイバで複数箇所のひずみの計測を行うように構成することもできる。
図６は本発明の内輪へのひずみセンサ内蔵型転がり軸受の荷重分布測定装置によって測定されるひずみ分布を示す模式図であり、図６（ａ）は内輪１回転目のひずみ分布を示す図、図６（ｂ）は内輪２回転目のひずみ分布を示す図、同様にある回転数まで順次回数を重ねて、図６（ｃ）は全ての測定値を重ね合わせたひずみ分布を示す図、図６（ｄ）はデータ処理を行って得られた転動体荷重分布を示す図である。なお、図６（ａ）〜図６（ｃ）における横軸は角度（転動体位置）、縦軸はひずみを示し、図６（ｄ）における横軸は角度（転動体位置）、縦軸は転動体荷重を示している。
Furthermore, although not shown in the drawing, the bearings are arranged in a double row, and an FBG sensor or a Fabry-Perot interference type strain sensor is arranged as an optical fiber strain sensor in each of the inner rings, so that a plurality of locations can be obtained with a plurality of optical fibers. It can also be configured to measure strain.
FIG. 6 is a schematic diagram showing a strain distribution measured by a load distribution measuring device for a rolling bearing with a built-in strain sensor on the inner ring of the present invention, and FIG. 6 (a) is a diagram showing a strain distribution at the first rotation of the inner ring, FIG. 6 (b) is a diagram showing the strain distribution of the second rotation of the inner ring, and similarly, the number of times is sequentially overlapped up to a certain number of revolutions, and FIG. 6 (c) is a diagram showing the strain distribution with all measured values superimposed. 6 (d) is a diagram showing a rolling element load distribution obtained by performing data processing. 6A to 6C, the horizontal axis indicates an angle (rolling element position), the vertical axis indicates strain, the horizontal axis in FIG. 6D indicates an angle (rolling element position), and the vertical axis indicates The rolling element load is shown.
これらの図に示すように、本発明によれば、転がり軸受の荷重分布を測定することができる。
なお、本発明は上記実施例に限定されるものではなく、本発明の趣旨に基づき種々の変形が可能であり、これらを本発明の範囲から排除するものではない。
As shown in these figures, according to the present invention, the load distribution of the rolling bearing can be measured.
In addition, this invention is not limited to the said Example, Based on the meaning of this invention, a various deformation | transformation is possible and these are not excluded from the scope of the present invention.
本発明の内輪へのひずみセンサ内蔵型転がり軸受の荷重分布測定方法及びその装置は、簡単な構成で精確な計測ができる転がり軸受の荷重分布測定のツールとして利用可能である。 INDUSTRIAL APPLICABILITY The load distribution measuring method and apparatus for a rolling bearing with a built-in strain sensor on the inner ring according to the present invention can be used as a load distribution measuring tool for a rolling bearing that can perform accurate measurement with a simple configuration.
１ 回転軸
２ 内輪
２Ａ 細穴
２Ａ′ 光ファイバ取り出し用細穴
２Ｂ 切欠溝
３，３′，２２，３０ 光ファイバ
４ ひずみセンサ部
５ 転動体
６ 外輪
７ ハウジング
８ 荷重
９ 転がり軸受の荷重分布
１０ ロータリージョイントの支持体
１１ ロータリージョイント
１２ ひずみ計測器
１３ ＬＡＮケーブル
１４ パーソナルコンピュータ（ＰＣ）
２１ ＦＢＧセンサ
２１ａ ＦＢＧセンサのコア
２１ｂ ＦＢＧセンサの取付端
２２ａ 光ファイバのコア
３１ ファブリ・ペロー干渉型のひずみセンサ
３２ ひずみ受け部材
３２ａ ひずみ受け部材の取付端
３３ 接着剤
３４ 第１のミラー
３４ａ 第１のミラーの反射面
３５ 第２のミラー
３５ａ 第２のミラーの反射面
Ｅ キャビティ長
Ｇ１〜Ｇｎ ｎ個のブラッグ回折格子
Ｌ レーザー光
Ｌ１ 入射レーザー光
Ｌ２ 反射レーザー光
DESCRIPTION OF SYMBOLS 1 Rotating shaft 2 Inner ring 2A Narrow hole 2A 'Thin hole for taking out optical fiber 2B Notch groove 3, 3', 22, 30 Optical fiber 4 Strain sensor part 5 Rolling element 6 Outer ring 7 Housing 8 Load 9 Rolling bearing load distribution 10 Rotary Joint support 11 Rotary joint 12 Strain measuring instrument 13 LAN cable 14 Personal computer (PC)
21 FBG sensor 21a FBG sensor core 21b FBG sensor mounting end 22a Optical fiber core 31 Fabry-Perot interference type strain sensor 32 Strain receiving member 32a Strain receiving member mounting end 33 Adhesive 34 First mirror 34a First Reflective surface of mirror 35 35 Second mirror 35a Reflective surface of second mirror E Cavity length G1 to Gn n Bragg gratings L laser beam L1 incident laser beam L2 reflected laser beam
Claims (4)
（ａ）回転軸に固定される前記転がり軸受の内輪と、
（ｂ）該内輪の円周方向に形成される細穴内に配置される光ファイバと、
（ｃ）該光ファイバに装備されるひずみセンサ部と、
（ｄ）前記内輪のひずみセンサ部が配置される位置の中心側に形成される切欠溝と、
（ｅ）前記内輪と該内輪の外方に配置される外輪との間に配置される転動体と、
（ｆ）前記回転軸の軸方向に配置され、前記回転軸に固定される支持体に支持される単一のロータリージョイントと、
（ｇ）該ロータリージョイントを介して光ファイバにより接続されるひずみ計測器とを備え、
（ｈ）前記転がり軸受を回転させて前記ひずみセンサ部の位置を前記転動体が通過する際のひずみを検出することを特徴とする内輪へのひずみセンサ内蔵型転がり軸受の荷重分布測定装置。 A rolling bearing in which the outer ring is fixed and the inner ring rotates,
(A) an inner ring of the rolling bearing fixed to the rotating shaft;
(B) an optical fiber disposed in a narrow hole formed in the circumferential direction of the inner ring;
(C) a strain sensor unit provided in the optical fiber;
(D) a notch groove formed on the center side of the position where the strain sensor portion of the inner ring is disposed;
(E) a rolling element disposed between the inner ring and an outer ring disposed outside the inner ring;
(F) a single rotary joint that is arranged in the axial direction of the rotary shaft and supported by a support fixed to the rotary shaft;
(G) a strain measuring instrument connected by an optical fiber through the rotary joint;
(H) A load distribution measuring apparatus for a rolling bearing with a built-in strain sensor in an inner ring, wherein the rolling bearing is rotated to detect strain when the rolling element passes through the position of the strain sensor section.
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| CN110174045A (en) * | 2019-06-24 | 2019-08-27 | 南京高速齿轮制造有限公司 | Gear case planet wheel bearing inner race strain measurement system |
| CN112539221A (en) * | 2019-09-23 | 2021-03-23 | 斯凯孚公司 | Bearing and bearing unit with single sensing fiber for load sensing |
| CN114705341A (en) * | 2022-05-12 | 2022-07-05 | 河南科技大学 | Device and method for measuring friction torque of rolling bearing based on optical fiber sensing |
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| DE102013222151A1 (en) * | 2013-10-31 | 2015-04-30 | Schaeffler Technologies Gmbh & Co. Kg | Device for measuring force in the rolling bearing by means of a sensor layer |
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| JP2006015822A (en) * | 2004-06-30 | 2006-01-19 | Hitachi Cable Ltd | Sensor system for detecting tire distortion |
| JP2009216664A (en) * | 2008-03-12 | 2009-09-24 | Railway Technical Res Inst | Load distribution measuring method as to inner ring for distortion sensor built-in type rolling bearing, and apparatus therefor |
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| JPH0961268A (en) * | 1995-08-25 | 1997-03-07 | Nippon Seiko Kk | Load measuring apparatus for bearing |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110174045A (en) * | 2019-06-24 | 2019-08-27 | 南京高速齿轮制造有限公司 | Gear case planet wheel bearing inner race strain measurement system |
| CN112539221A (en) * | 2019-09-23 | 2021-03-23 | 斯凯孚公司 | Bearing and bearing unit with single sensing fiber for load sensing |
| CN114705341A (en) * | 2022-05-12 | 2022-07-05 | 河南科技大学 | Device and method for measuring friction torque of rolling bearing based on optical fiber sensing |
| CN114705341B (en) * | 2022-05-12 | 2024-02-02 | 河南科技大学 | Rolling bearing friction moment measuring device and method based on optical fiber sensing |
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