JP4101607B2

JP4101607B2 - Bearing with power generation function

Info

Publication number: JP4101607B2
Application number: JP2002302503A
Authority: JP
Inventors: 政敏水谷; 浩一岡田
Original assignee: NTN Corp
Current assignee: NTN Corp
Priority date: 2002-10-17
Filing date: 2002-10-17
Publication date: 2008-06-18
Anticipated expiration: 2022-10-17
Also published as: JP2004138133A

Description

【０００１】
【発明の属する技術分野】
この発明は、種々の機器、例えば汎用エンジンのクランク軸，その他の駆動伝達系等に用いられて軸受回転による発電が可能な発電機能付き軸受に関する。
【０００２】
【従来の技術】
この種の発電機能付き軸受として、図８に示す内輪回転形のものがある。この軸受は、回転軸２５に嵌合されて回転する内輪２２に、ロータである多極磁石２７が芯金２８を介して固定され、ステータであるヨーク３０が、多極磁石２７の外周側に位置するように外輪２３に固定されている。ヨーク３０内にコイル３１が設けられる。上記多極磁石２７とヨーク３０とで発電機２６が構成される。ヨーク３０の内径側には櫛歯状の爪（図示せず）が周方向に並べて形成されており、これらの爪がヨーク３０の内周側に位置する多極磁石２７と対向している。
この他の発電機能付き軸受の例として、図示は省略するが、内部にコイルを有するヨークを内輪に取付け、外輪に磁石を取付けたものも提案されている（例えば特許文献１）。
【０００３】
【特許文献１】
特開２００２−１３０２６２号公報
【０００４】
【発明が解決しようとする課題】
図８の例のように、ロータである多極磁石２７の外周にヨーク３０を配置した発電機２６の場合、その発電電力を大きくするためには、多極磁石２７の直径を大きくする必要がある。これに伴い、多極磁石２７の外径側に配置されるヨーク３０の直径も大きくなるため、発電機２６の全体が大きくなる。
上記特許文献１の例のように、内輪にコイルを取付け、外輪にヨークを取付けたものでは、磁石の直径を大きくしても、発電機全体が大きくなることは回避できる。しかし、コイルが回転側となるため、軸受ハウジング等の固定側の部材に発電電力を供給する場合に、ロータリ式コネクタ等が必要となり、配線系が煩雑となる。
【０００５】
この発明の目的は、コンパクトな構成で大きな発電電力を得ることができ、かつ発電電力の供給系も簡素な構成にできる発電機能付き軸受を提供することである。
【０００６】
【課題を解決するための手段】
上記の課題を解決するために、この発明の発電機能付き軸受は、互いに転動体を介して相対回転自在な内輪および外輪と、環状の磁石、およびこの磁石に対向配置されて内部にコイルを有するリング部材であるヨークにより構成され内外輪の相対回転によって発電する発電機とを備えた内輪回転形の発電機能付軸受において、上記ヨークを外輪の一端部の内径面に嵌合させて外輪に軸方向に突出状態に取付け、上記磁石を、上記ヨークの外周側に位置させて内輪に取付部材を介して取付け、この取付部材は、上記ヨークの外径面、内径面、および突出側の側面にわたって囲繞する断面概形がコ字状の環状であって、開口側端で内輪に取付けられ、この取付部材の側面に放熱用のフィンを設けたことを特徴とする。
この構成によると、磁石をヨークの外周側に配置したため、発電電力を高めるために磁石の外径を大きくしても、磁石よりも発電機外径が大きくなることがない。そのため、コンパクトな構成で大きな発電電力を得ることができる。また、コイルを有するヨークは、固定側輪である外輪に取付けるため、軸受ハウジング等の固定側部材への発電電力の供給に、ロータリ式コネクタ等が不要で、簡素な構成で済む。なお、上記磁石は、ヨークよりも軸受軸方向の外側へ突出した取付部材を介して内輪に取付ける。
【０００７】
内輪に取付けられる磁石を、外輪に取付けられるヨークの外周側に位置させると、コイル内蔵のヨークが磁石の芯金等の取付部材によって覆われることになり、放熱が悪くなる。放熱が悪くなると、磁石が熱減磁することがある。しかし、このように放熱用のフィンを設けると、放熱を良くすることができ、発電機内部の温度上昇が防止される。
【０００８】
上記放熱用のフィンを設ける代わりに、または放熱用のフィンを設けると共に、上記取付部材に、内輪の回転によって発電機内外への空気流を生じさせる強制空冷用の羽根を設けても良い。
このように羽根を設けた場合、羽根の傾き方向と磁石回転方向の関係により、羽根が外部の空気を発電機の内部に送り込むか、または発電機の内部から空気を吸い出すことになり、強制空冷できる。そのため、より一層確実に、発電機内部の温度上昇が防止される。
【０００９】
この発明において、上記発電機が電力供給と回転検出とを兼ねるものであっても良い。発電機は交流電力を発生するため、その電圧の変化を検出することなどで、回転検出を行うことができる。この兼用により、発電機とは別に回転検出装置を設置する場合に比べて全体の構成をよりコンパクトにできる。
【００１０】
この発明において、上記ヨークは磁性体のリング部材であって、磁石と対面する部分に、互いに対向方向に延びる２組の櫛歯状の爪が形成され、両組の各爪が円周方向に隙間を介して交互に並ぶものとされていても良い。いわゆるクローポール形の発電機としても良い。このように櫛歯状の爪を形成した場合は、発電電力を確保しながら、発電機全体をコンパクトに構成することができる。また、発電機が回転検出手段を兼ねるものとする場合に、上記爪により多極化が容易で、高分解能の回転検出を行うことができる。
この発明において、上記ヨークにオイルを循環させてこのヨークの冷却を行うようにしても良い。
【００１１】
【発明の実施の形態】
図１はこの発明の第１の参考提案例にかかる発電機能付き軸受を示す。この発電機能付き軸受１は内輪回転型の転がり軸受であり、内輪２と、外輪３と、内輪２および外輪３に対向して形成された転走面２ａ，３ａ間に回転自在に収容された複数の転動体４とを備える。内輪２は、例えば回転軸５に嵌合状態に取付けられて回転する。内輪２には、多極の磁石７が取付部材を介して取付けられ、外輪３にはコイル１６を内蔵した磁性体のヨーク１０が取付けられている。磁石７はヨーク１０の外周側に位置する。上記取付部材は芯金８およびリング部材９により構成される。これら磁石７，芯金８，リング部材９，およびヨーク１０により発電機６が構成される。
【００１２】
上記芯金８およびリング部材９はプレス成形品からなる。リング部材９は、断面概形がＺ字状の環状部材であって、小径筒部９ａとその一端から軸方向に続く大径筒部９ｂとを有し、大径筒部９ｂを内輪２の一端部の外径面に嵌合させることで内輪２２に固定されている。芯金８は断面概形がコ字状の環状部材であって、互いに同心状の内径筒部８ａおよび外径筒部８ｂと、内径筒部８ａの一端から外径筒部８ｂの一端に向けて径方向に延びて両筒部８ａ，８ｂを繋ぐ側面部８ｃとを有し、その内径筒部８ａをリング部材９の小径筒部９ｂの外径面に嵌合させることでリング部材９に固定されている。芯金８の大径筒部８ｂの内径面に多極磁石７が接着剤等により固定されている。
【００１３】
磁石７は発電機６のロータとなる部材であって、図２（Ａ），（Ｂ）に断面図および正面図で示すように環状に形成され、その内周面に周方向に並べて複数の磁極Ｎ，Ｓが交互に並ぶように着磁されている。この磁石７は、焼結磁石、プラスチック磁石、ゴム磁石のいずれからなるものであっても良い。磁石７がゴム磁石からなる場合には、芯金８に対して加硫接着しても良い。このほか、磁石７は加締めなどの機械的方法で芯金８に固定しても良い。芯金８の大径筒部８ｂは磁性体であることが好ましい。
【００１４】
ヨーク１０は、図３（Ａ），（Ｂ）に側面図および正面図で示すように、互いに軸方向に対面する２つの磁性体リング１２，１３を組み合わせたリング部材であって、外輪３の一端部の内径面に嵌合させることで、上記磁石７の内周側に位置して磁石７と径方向に対向するように外輪３に固定される。ヨーク１０に内蔵したコイル１６（図１）の引き出し線１１はヨーク１０から引き出されている。各磁性体リング１２，１３はプレス成形品からなり、それぞれ外周側には軸方向に延びる複数の櫛歯状爪１４，１５が所定の隙間を隔て周方向に並べて形成されている。これら両方の爪１４，１５が軸方向に対向するように両磁性体リング１２，１３を互いに嵌合させてヨーク１０が構成される。一方の磁性体リング１２の爪１４と他方の磁性体リング１３の爪１５とは、周方向に交互に並ぶようにされている。これらの爪１４，１５は、外周側に配置される磁石７と径方向に対向する。
【００１５】
発電機６の発電電力は、軸受１の内部または外部に設置された例えば回転検出装置やコントロールユニット（いずれも図示せず）等の負荷に電源として供給される。発電機６は電力供給だけに使用しても良いが、発電機６が発生する交流信号を回転軸５の回転検出のための信号として利用するようにしても良い。このように発電機６が発生する交流信号を回転検出信号として利用することにより、発電機６とは別に回転検出装置を設置する場合に比べて全体の構成をよりコンパクトにできる。
【００１６】
この構成の発電機能付き軸受１によると、外輪３に固定されるヨーク１０の外周側に、回転部材である内輪１に固定される磁石７を配置して発電機６を構成しているので、発電電力を高めるために磁石７の外径を大きくしても、磁石７が発電機６の外径となり、それよりも発電機外径が大きくなることがない。そのためコンパクトな構成で大きな発電電力を得ることができる。また、コイル１６を内蔵するヨーク１０は、固定側輪である外輪３に取付けるため、軸受ハウジング等の固定側部材への発電電力の供給に、ロータリ式コネクタ等が不要で、簡素な構成で済む。
【００１７】
また、ヨーク１０がリング部材であって、磁石７と対面する外周側の部分に、互いに軸方向に対向して延びる２組の櫛歯状の爪１４，１５が形成され、両組の各爪１４，１５が周方向に隙間を介して交互に並ぶものとされているので、ヨーク１０の外周側に磁石７を配置したこととあいまって、必要な発電電力を得るのに必要な磁極ピッチを確保しながら、発電機６の外径を小さくしてコンパクトに構成できる。
この発電機能付き軸受１の潤滑はグリス潤滑でもオイル潤滑でも良いが、オイル潤滑の場合は、このオイルをヨーク１０に循環させることでヨーク１０の冷却を行うことができる。
【００１８】
図４は、この発明の他の参考提案例にかかる発電機能付き軸受を示す。この発電機能付き軸受１は、図１〜図３に示す第１の参考提案例において、発電機６のロータ構成部材としてリング部材９を省略し、断面コ字状の芯金８の内径筒部８ａを内輪２の一端部の内径面に直接に嵌合させることにより、芯金８を介して磁石７を内輪２に固定している。その他の構成は第１の参考提案例と同様である。
【００１９】
このように芯金８を直接に内輪２に嵌合させることで、リング部材９を省略でき、発電機６の構成をよりコンパクトにできる。
【００２０】
図５（Ａ），（Ｂ）は、この発明の実施形態にかかる発電機能付き軸受の断面図および側面図を示す。この発電機能付き軸受１は、図１〜図３に示す第１の参考提案例において、発電機６のロータ構成部材の１つである芯金８の側面部８ｃに、例えばプレス成形により周方向に並ぶ複数の放熱用フィン１７を設けたものである。放熱用フィン１７は、例えば芯金８の側面部８ｃを、カウンタシンクの突部とした形状とされる。この突部からなる放熱用フィン１７は、内外面に通じる開口を有するものであっても良い。この実施形態のその他の構成は第１の参考提案例と同様である。
【００２１】
発電機６は、ステータであるヨーク１０がその外周側に配置されるロータ部材（磁石７，芯金８）で覆われた構成であるため、ヨーク１０の損失による熱やコイル巻線の通電による熱が発電機６の内部にこもり易いが、この実施形態では上記したように芯金８の側面部８ｃに複数の放熱用フィン１７が設けられているので、芯金８の表面積が増え、放熱を高めることができる。その結果、発電機６の内部にこもる熱で磁石７が熱減磁を起こすのを防止でき、またコイルの耐久性の向上も得られる。
【００２２】
図６および図７は、この発明の他の実施形態にかかる発電機能付き軸受を示す。この発電機能付き軸受１は、図１〜図３に示す第１の参考提案例において、発電機６のロータ構成部材の１つである芯金８の側面部８ｃに、強制空冷用の送風を行う羽根１８を設けたものである。この羽根１８は、周方向に並んで複数設けられており、例えばプレス成形により形成される。この羽根１８は、図７（Ａ），（Ｂ）に側面図および正面図で示すように、芯金側面部８ｃの外側に突出させたルーバ状の凸部１８ａとされ、この凸部１８ａの周方向に向く一側面に通気孔１８ｂが開口している。その他の構成は第１の参考提案例と同様である。
【００２３】
この実施形態では、例えば内輪２を、羽根１８の通気孔１８ｂが開口していない側面１８ｃ（図７（Ｃ））から通気孔１８ｂが設けられている向きに回転させると、この羽根１８が外部の空気を通気孔１８ｂから発電機６の内部に送り込むことになり、発電機６を強制空冷できる。その結果、発電機６の内部にこもる熱で磁石７が熱減磁を起こしたり、コイル１６の巻線に悪影響を与えることを防止できる。
【００２４】
内輪２を上記の場合と逆方向に回転させると、羽根１８における通気孔１８ｂの近傍が負圧となり、発電機６の内部の空気が通気孔１８ｂから外部に吸い出される。そのため、発電機６を強制空冷できる。軸受１をオイル潤滑する場合は、ロータの回転方向として発電機６の内部の空気を外に吸い出す方向を選ぶ方が、オイルの循環を妨げないので望ましい。
なお、上記羽根１８は、その凸部１８ａを芯金側面部８ｃの内側に突出させた形状としてもよく、上記と同様の空冷機能を得ることができる。
【００２５】
【発明の効果】
この発明の発電機能付き軸受は、内外輪の相対回転によって発電する発電機を備えた内輪回転型の発電機能付軸受において、ロータとなる磁石をヨークの外周側に配置したため、コンパクトな構成で大きな発電電力を得ることができ、かつ発電電力の供給系も簡素な構成にできる。
上記磁石の芯金に、放熱用のフィンを設けた場合や、強制冷却用の羽根を設けた場合は、発電機の内部にこもる熱の放熱が行え、磁石の熱減磁やコイル巻線の劣化が防止される。
発電機が回転検出を兼ねるものとした場合は、回転検出手段を別置きする場合に比べてコンパクトになる。
上記ヨークが２組の櫛歯状の爪が形成されたものである場合は、発電の効率を高めることができる。
【図面の簡単な説明】
【図１】この発明の参考提案例にかかる発電機能付き軸受を示す断面図である。
【図２】（Ａ）は同軸受における発電機の磁石の断面図、（Ｂ）は同磁石の正面図である。
【図３】（Ａ）は同軸受における発電機のヨークの側面図、（Ｂ）は同ヨークの正面図である。
【図４】この発明の他の参考提案例にかかる発電機能付き軸受を示す断面図である。
【図５】（Ａ）はこの発明の実施形態にかかる発電機能付き軸受の断面図、（Ｂ）は同軸受の側面図である。
【図６】（Ａ）はこの発明の他の実施形態にかかる発電機能付き軸受の断面図、（Ｂ）は同軸受の側面図である。
【図７】（Ａ）は同軸受における発電機の羽根の側面図、（Ｂ）は同羽根の平面図、（Ｃ）は（Ｂ）におけるVII −VII 矢視断面図である。
【図８】従来例の断面図である。
【符号の説明】
１…発電機能付き軸受
２…内輪
３…外輪
４…転動体
６…発電機
７…磁石
８…芯金
１０…ヨーク
１２，１３…磁性体リング
１４，１５…櫛歯状の爪
１７…放熱用フィン
１８…羽根[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bearing with a power generation function that is used in various devices such as a crankshaft of a general-purpose engine, other drive transmission systems, and the like and can generate power by rotating a bearing.
[0002]
[Prior art]
As this type of bearing with a power generation function, there is an inner ring rotating type shown in FIG. In this bearing, a multipolar magnet 27 that is a rotor is fixed to a rotating inner ring 22 that is fitted to a rotary shaft 25 via a cored bar 28, and a yoke 30 that is a stator is disposed on the outer peripheral side of the multipolar magnet 27. It is fixed to the outer ring 23 so as to be positioned. A coil 31 is provided in the yoke 30. The multipolar magnet 27 and the yoke 30 constitute a generator 26. Comb-like claws (not shown) are formed in the circumferential direction on the inner diameter side of the yoke 30, and these claws are opposed to the multipolar magnet 27 located on the inner circumference side of the yoke 30.
As another example of a bearing with a power generation function, although not shown in the drawings, a bearing in which a yoke having a coil inside is attached to an inner ring and a magnet is attached to an outer ring has been proposed (for example, Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 2002-130262
[Problems to be solved by the invention]
As in the example of FIG. 8, in the case of the generator 26 in which the yoke 30 is disposed on the outer periphery of the multipolar magnet 27 that is a rotor, the diameter of the multipolar magnet 27 needs to be increased in order to increase the generated power. is there. As a result, the diameter of the yoke 30 disposed on the outer diameter side of the multipolar magnet 27 also increases, so that the entire generator 26 increases.
In the case where the coil is attached to the inner ring and the yoke is attached to the outer ring as in the example of Patent Document 1, it is possible to avoid an increase in the overall generator even if the diameter of the magnet is increased. However, since the coil is on the rotating side, a rotary connector or the like is required when supplying generated power to a fixed member such as a bearing housing, which complicates the wiring system.
[0005]
An object of the present invention is to provide a bearing with a power generation function capable of obtaining a large amount of generated power with a compact configuration and a simple configuration of a supply system for the generated power.
[0006]
[Means for Solving the Problems]
In order to solve the above-described problems, a bearing with a power generation function according to the present invention includes an inner ring and an outer ring that are rotatable relative to each other via a rolling element, an annular magnet, and a coil disposed inside and opposed to the magnet. In a bearing with a power generation function of an inner ring rotation type comprising a yoke which is a ring member and generating a power by relative rotation of inner and outer rings, the yoke is fitted to the inner diameter surface of one end of the outer ring and the shaft is attached to the outer ring. attached to the projecting state in the direction of the magnet, attached only via the attachment member to the inner ring is positioned on the outer peripheral side of the yoke, the mounting member, the side surface of the outer surface, inner surface, and the protruding side of the yoke The cross-sectional outline that surrounds the ring is a U-shaped ring, and is attached to the inner ring at the opening side end, and a heat radiating fin is provided on the side surface of the mounting member .
According to this configuration, since the magnet is arranged on the outer peripheral side of the yoke, the generator outer diameter does not become larger than the magnet even if the outer diameter of the magnet is increased in order to increase the generated power. Therefore, large generated power can be obtained with a compact configuration. Further, since the yoke having the coil is attached to the outer ring which is a fixed side wheel, a rotary connector or the like is not required for supplying generated power to a fixed side member such as a bearing housing, and a simple configuration is sufficient. Incidentally, the magnet is attached to the inner ring via an attachment member projecting outwardly of the bearing axis than yaw click.
[0007]
A magnet attached to the inner ring and is positioned on the outer peripheral side of the yoke to be attached to the outer ring, will be built-in coil of the yoke is covered by the mounting member of the core metal such magnets, the heat dissipation is deteriorated. If the heat dissipation is poor, the magnet may be thermally demagnetized. However, if the fins for heat dissipation are provided in this way, heat dissipation can be improved and temperature rise inside the generator can be prevented.
[0008]
Instead of providing the fin for the heat dissipation, or provided with fins for heat dissipation, the upper Symbol mounting member may be provided with a blade for forced air cooling for creating an air flow to the generator and out by rotation of the inner ring.
When blades are provided in this way, depending on the relationship between the direction of blade inclination and the direction of magnet rotation, the blades either send external air into the generator or suck out air from the generator. it can. Therefore, the temperature rise inside the generator can be prevented more reliably.
[0009]
In the present invention, the generator may serve as both power supply and rotation detection. Since the generator generates AC power, rotation can be detected by detecting a change in the voltage. As a result, the overall configuration can be made more compact than when a rotation detector is installed separately from the generator.
[0010]
In this invention, the yoke is a ring member made of a magnetic material, and two sets of comb-like claws extending in opposite directions are formed in a portion facing the magnet, and each pair of claws is circumferentially arranged. It may be arranged alternately through a gap. It may be a so-called claw pole type generator. When the comb-like claws are formed in this way, the entire generator can be made compact while securing the generated power. In addition, when the generator also serves as a rotation detection means, it is easy to increase the number of poles with the claw, and high-resolution rotation detection can be performed.
In the present invention, the yoke may be cooled by circulating oil through the yoke.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a bearing with a power generation function according to a first reference proposal example of the present invention. This bearing 1 with a power generation function is an inner ring rotation type rolling bearing, and is rotatably accommodated between an inner ring 2, an outer ring 3, and rolling surfaces 2a and 3a formed to face the inner ring 2 and the outer ring 3. A plurality of rolling elements 4 are provided. The inner ring 2 is attached to the rotating shaft 5 in a fitted state and rotates, for example. A multipolar magnet 7 is attached to the inner ring 2 via an attachment member, and a magnetic yoke 10 incorporating a coil 16 is attached to the outer ring 3. The magnet 7 is located on the outer peripheral side of the yoke 10. The mounting member is constituted by a cored bar 8 and a ring member 9. The magnet 7, the core metal 8, the ring member 9, and the yoke 10 constitute a generator 6.
[0012]
The core bar 8 and the ring member 9 are formed by press molding. The ring member 9 is an annular member having a Z-shaped cross-section, and includes a small-diameter cylindrical portion 9a and a large-diameter cylindrical portion 9b extending in the axial direction from one end thereof, and the large-diameter cylindrical portion 9b is connected to the inner ring 2. It is being fixed to the inner ring | wheel 22 by making it fit in the outer-diameter surface of one end part. The cored bar 8 is an annular member having a U-shaped cross-section, and is concentric with the inner diameter cylindrical portion 8a and the outer diameter cylindrical portion 8b, and from one end of the inner diameter cylindrical portion 8a toward one end of the outer diameter cylindrical portion 8b. The side surface portion 8c that extends in the radial direction and connects both the cylindrical portions 8a and 8b, and the inner diameter cylindrical portion 8a is fitted to the outer diameter surface of the small diameter cylindrical portion 9b of the ring member 9, thereby allowing the ring member 9 to It is fixed. A multipolar magnet 7 is fixed to the inner diameter surface of the large-diameter cylindrical portion 8b of the core metal 8 with an adhesive or the like.
[0013]
The magnet 7 is a member that becomes a rotor of the generator 6 and is formed in an annular shape as shown in the sectional view and the front view in FIGS. 2 (A) and 2 (B). The magnetic poles N and S are magnetized so as to be arranged alternately. The magnet 7 may be made of any of a sintered magnet, a plastic magnet, and a rubber magnet. When the magnet 7 is a rubber magnet, the core 7 may be vulcanized and bonded. In addition, the magnet 7 may be fixed to the cored bar 8 by a mechanical method such as caulking. The large-diameter cylindrical portion 8b of the cored bar 8 is preferably a magnetic material.
[0014]
The yoke 10 is a ring member in which two magnetic rings 12 and 13 facing each other in the axial direction are combined, as shown in the side view and the front view in FIGS. By being fitted to the inner diameter surface of the one end, it is fixed to the outer ring 3 so as to be positioned on the inner peripheral side of the magnet 7 and to face the magnet 7 in the radial direction. A lead wire 11 of a coil 16 (FIG. 1) built in the yoke 10 is drawn from the yoke 10. Each of the magnetic rings 12 and 13 is made of a press-molded product, and a plurality of comb-like claws 14 and 15 extending in the axial direction are formed on the outer peripheral side so as to be arranged in the circumferential direction with a predetermined gap therebetween. The yoke 10 is formed by fitting the magnetic rings 12 and 13 together so that both the claws 14 and 15 face each other in the axial direction. The claw 14 of one magnetic body ring 12 and the claw 15 of the other magnetic body ring 13 are arranged alternately in the circumferential direction. These claws 14 and 15 are opposed to the magnet 7 arranged on the outer peripheral side in the radial direction.
[0015]
The power generated by the generator 6 is supplied as a power source to a load such as a rotation detection device or a control unit (both not shown) installed inside or outside the bearing 1. The generator 6 may be used only for power supply, but an AC signal generated by the generator 6 may be used as a signal for detecting rotation of the rotating shaft 5. In this way, by using the AC signal generated by the generator 6 as the rotation detection signal, the overall configuration can be made more compact than when a rotation detection device is installed separately from the generator 6.
[0016]
According to the bearing 1 with the power generation function of this configuration, the generator 6 is configured by disposing the magnet 7 fixed to the inner ring 1 as a rotating member on the outer peripheral side of the yoke 10 fixed to the outer ring 3. Even if the outer diameter of the magnet 7 is increased in order to increase the generated power, the magnet 7 becomes the outer diameter of the generator 6 and the generator outer diameter does not become larger than that. Therefore, large generated power can be obtained with a compact configuration. Further, since the yoke 10 incorporating the coil 16 is attached to the outer ring 3 which is a fixed side wheel, a rotary connector or the like is not required for supplying generated power to a fixed side member such as a bearing housing, and a simple configuration is sufficient. .
[0017]
Further, the yoke 10 is a ring member, and two sets of comb-like claws 14 and 15 extending in the axial direction are formed on the outer peripheral side facing the magnet 7. 14 and 15 are alternately arranged in the circumferential direction with a gap therebetween, and in combination with the arrangement of the magnet 7 on the outer circumferential side of the yoke 10, the magnetic pole pitch necessary for obtaining the necessary generated power is obtained. While securing, the outer diameter of the generator 6 can be reduced to be compact.
The lubrication of the bearing 1 with the power generation function may be grease lubrication or oil lubrication. In the case of oil lubrication, the yoke 10 can be cooled by circulating the oil through the yoke 10.
[0018]
FIG. 4 shows a bearing with a power generation function according to another reference proposal example of the present invention. The generator function bearing 1 has an inner diameter of the first reference proposed Oite example, omitting the ring member 9 as rotor constituent members of the generator 6, a U-shaped cross section of the core 8 shown in FIGS. 1 to 3 The magnet 7 is fixed to the inner ring 2 via the cored bar 8 by directly fitting the cylindrical part 8 a to the inner diameter surface of one end of the inner ring 2. The rest of the configuration is the first of reference proposed example the same way.
[0019]
Thus, by directly fitting the metal core 8 to the inner ring 2, the ring member 9 can be omitted, and the configuration of the generator 6 can be made more compact.
[0020]
Figure 5 (A), (B) shows a cross-sectional view and a side view of a power generation function bearing according to implementation embodiments of the present invention. The generator function bearing 1, the first Oite reference Proposed Example, side surface portion 8c of the metal core 8 which is one of the rotor components of the generator 6 shown in FIGS. 1 to 3, for example by press molding A plurality of heat radiation fins 17 arranged in the circumferential direction are provided. The heat radiating fins 17 have a shape in which, for example, the side surface portion 8c of the cored bar 8 is a protruding portion of the counter sink. The heat dissipating fins 17 formed of the protrusions may have openings that communicate with the inner and outer surfaces. Other configurations of this embodiment are the same as those of the first reference proposal example .
[0021]
Since the generator 6 has a configuration in which a yoke 10 serving as a stator is covered with a rotor member (magnet 7 and cored bar 8) disposed on the outer peripheral side thereof, heat generated by loss of the yoke 10 or energization of coil windings. Although heat is easily trapped inside the generator 6, in this embodiment, since the plurality of heat radiation fins 17 are provided on the side surface portion 8 c of the cored bar 8 as described above, the surface area of the cored bar 8 is increased and the heat radiation is increased. Can be increased. As a result, it is possible to prevent the magnet 7 from being thermally demagnetized by the heat trapped inside the generator 6, and to improve the durability of the coil.
[0022]
6 and 7 show a bearing with a power generation function according to another embodiment of the present invention. The generator function bearing 1, the first Oite reference Proposed Example, side surface portion 8c of the metal core 8 which is one of the rotor components of the generator 6 shown in FIGS. 1 to 3, for forced air cooling A blade 18 for blowing air is provided. A plurality of blades 18 are provided side by side in the circumferential direction, and are formed, for example, by press molding. As shown in the side view and the front view in FIGS. 7A and 7B, the blade 18 is formed as a louver-shaped convex portion 18a that protrudes outside the core metal side surface portion 8c. A vent hole 18b is opened on one side face in the circumferential direction. Other configurations are the same as those of the first reference proposal example .
[0023]
In this embodiment, for example, when the inner ring 2 is rotated from the side surface 18c (FIG. 7C) where the air holes 18b of the blades 18 are not opened to the direction in which the air holes 18b are provided, the blades 18 are externally moved. The air is fed into the generator 6 from the vent hole 18b, and the generator 6 can be forced-air cooled. As a result, it is possible to prevent the magnet 7 from being thermally demagnetized by the heat trapped inside the generator 6 and adversely affecting the winding of the coil 16.
[0024]
When the inner ring 2 is rotated in the direction opposite to the above case, the vicinity of the vent hole 18b in the blade 18 becomes negative pressure, and the air inside the generator 6 is sucked out from the vent hole 18b. Therefore, the generator 6 can be forcibly air-cooled. When the bearing 1 is oil-lubricated, it is desirable to select the direction in which the air inside the generator 6 is sucked out as the rotation direction of the rotor because it does not hinder the oil circulation.
In addition, the said blade | wing 18 is good also as a shape which made the convex part 18a protrude inside the core metal side part 8c, and can obtain the air-cooling function similar to the above.
[0025]
【The invention's effect】
The bearing with a power generation function of the present invention is a large bearing with a compact structure because the magnet serving as the rotor is arranged on the outer peripheral side of the yoke in the inner ring rotation type bearing with a power generation function provided with a generator that generates power by relative rotation of the inner and outer rings. The generated power can be obtained, and the supply system of the generated power can be simplified.
When a fin for heat dissipation is provided on the core of the magnet, or when a blade for forced cooling is provided, the heat accumulated in the generator can be dissipated, and heat demagnetization of the magnet and coil winding Deterioration is prevented.
When the generator also serves as rotation detection, the generator is more compact than when the rotation detection means is separately provided.
When the yoke has two sets of comb-like claws, the efficiency of power generation can be increased.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a bearing with a power generation function according to a reference proposal example of the present invention.
2A is a cross-sectional view of a generator magnet in the bearing, and FIG. 2B is a front view of the magnet.
3A is a side view of a generator yoke in the bearing, and FIG. 3B is a front view of the yoke.
FIG. 4 is a sectional view showing a bearing with a power generation function according to another reference proposal example of the present invention.
[5] (A) is a sectional view of the power generation function bearing according to implementation embodiments of the present invention, (B) is a side view of the bearing.
6A is a cross-sectional view of a bearing with a power generation function according to another embodiment of the present invention , and FIG. 6B is a side view of the bearing.
7A is a side view of a blade of a generator in the bearing, FIG. 7B is a plan view of the blade, and FIG. 7C is a cross-sectional view taken along arrow VII-VII in FIG.
FIG. 8 is a cross-sectional view of a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Bearing with power generation function 2 ... Inner ring 3 ... Outer ring 4 ... Rolling body 6 ... Generator 7 ... Magnet 8 ... Core metal 10 ... Yoke 12, 13 ... Magnetic body rings 14, 15 ... Comb-like claw 17 ... For heat radiation Fin 18 ... Feather

Claims

A generator that is constituted by an inner ring and an outer ring that are rotatable relative to each other via a rolling element, an annular magnet, and a yoke that is a ring member that is disposed opposite to the magnet and has a coil therein, and that generates electric power by relative rotation of the inner and outer rings. In the inner ring rotating type bearing with a power generation function, the yoke is fitted to the inner diameter surface of one end of the outer ring and attached to the outer ring in an axially projecting state, and the magnet is positioned on the outer peripheral side of the yoke. was attached only via the mounting member to the inner ring is, the mounting member, the outer diameter surface of the yoke, cross-sectional outline to surround over the side surface of the inner surface, and the projecting side is a U-shaped annular opening side A bearing with a power generation function, characterized in that it is attached to the inner ring at the end, and a fin for heat radiation is provided on the side surface of the attachment member .

Oite to claim 1, the upper Symbol mounting member, with the power generation function bearing having a blade for forced air cooling for creating an air flow to the generator and out by rotation of the inner ring.

Oite to claim 1 or claim 2, with the power generation function bearing the generator also serves as a rotation detection and power supply.

4. The yoke according to claim 1, wherein the yoke is a magnetic ring member, and two sets of comb-like claws extending in opposite directions are formed on a portion facing the magnet. Bearings with a power generation function in which the claws are alternately arranged in the circumferential direction with gaps.

5. A bearing with a power generation function according to claim 1, wherein oil is circulated through the yoke to cool the yoke.