JP2007298060A - Rolling bearing - Google Patents

Rolling bearing Download PDF

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JP2007298060A
JP2007298060A JP2006124172A JP2006124172A JP2007298060A JP 2007298060 A JP2007298060 A JP 2007298060A JP 2006124172 A JP2006124172 A JP 2006124172A JP 2006124172 A JP2006124172 A JP 2006124172A JP 2007298060 A JP2007298060 A JP 2007298060A
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rolling bearing
outer ring
ring
insulating coating
outer diameter
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Yu Suzuki
佑 鈴木
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NSK Ltd
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NSK Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/62—Selection of substances
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/583—Details of specific parts of races
    • F16C33/586—Details of specific parts of races outside the space between the races, e.g. end faces or bore of inner ring
    • 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
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
    • F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls
    • 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
    • F16C2202/00—Solid materials defined by their properties
    • F16C2202/30—Electric properties; Magnetic properties

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing with an insulating coat having higher impedance for preventing electroerosion. <P>SOLUTION: Rolling elements 3 (balls) are rollingly mounted between an outer ring 1 and an inner ring 2, and a cage 4 is provided for holding the rolling elements 3. The insulating coat 5 is applied onto the outer diameter face and both end faces of the outer ring 1. A recessed portion 10 (a groove) is partially provided in the outer diameter face of the outer ring 1 in the cross direction. Namely, as shown in Fig.(a), the predetermined-width recessed portion 10 (the groove) is formed in an approximately central portion of the outer diameter face of the outer ring 1 extending to the circumferential direction. Thus, the rolling bearing with the insulating coat has higher impedance for preventing electroerosion. It is acceptable to form the recessed portions 10 (the grooves) in a plurality of rows (double rows), as shown in Fig.(b). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、軸受の内輪・外輪間に電位差を生じて電食の危険のある部位、例えば鉄道車両用のトラクションモーター、一般電動機および発電機のローター軸の支持軸受などに使用される絶縁被膜付きの転がり軸受に関する。   The present invention is provided with an insulating coating used in a portion where there is a risk of electric corrosion due to a potential difference between the inner ring and outer ring of the bearing, such as a traction motor for a railway vehicle, a support shaft for a rotor shaft of a general electric motor and a generator. The present invention relates to a rolling bearing.

電動機（若しくは発電機）の回転子（ローター）に使用される転がり軸受において、内輪と外輪の間に電位差が生じると、転動体と軌道面の間に潤滑油を通してスパークが生じ、表面に電食と呼ばれる損傷が発生することがありうる。   In a rolling bearing used for a rotor of an electric motor (or generator), if a potential difference is generated between the inner ring and the outer ring, a spark is generated between the rolling element and the raceway through lubricating oil, and electric corrosion occurs on the surface. The damage called can occur.

これを防止するためには、この部分に電気的な絶縁をとってやれば良いが、転がり軸受に、このような機能を付加する方法として、軌道輪の取付け面に絶縁体であるセラミックや樹脂による絶縁被膜を設ける方法が知られている。   In order to prevent this, it is only necessary to electrically insulate this part, but as a method of adding such a function to the rolling bearing, ceramic or resin as an insulator on the mounting surface of the bearing ring There is known a method of providing an insulating coating by the above.

絶縁被膜付きの転がり軸受の設置については、装置は、従来構造のままで、転がり軸受に絶縁処置を施したものに置き換えるだけで良く、別途に絶縁構造を設ける必要もないため、軽量かつ省スペースである。
特開平７−２７９９７２号公報 特開２００５−１３３８７６号公報 特開２００２−４８１４５号公報 特開２００４−１３２３８５号公報 特開平１０−３７９４９号公報 特開平１０−３７９６６号公報 特開２００５−１７２５１号公報 As for the installation of rolling bearings with insulating coatings, the equipment remains the same as the conventional structure, and it is only necessary to replace the rolling bearings with insulation treatment, and there is no need to provide a separate insulating structure. It is.
JP-A-7-279972 JP 2005-133876 A JP 2002-48145 A JP 2004-132385 A JP 10-37949 A Japanese Patent Laid-Open No. 10-37966 JP 2005-17251 A

モーターの制御においては、ＰＷＭ（Pulse width modulation）制御のキャリア周波数が高くなる傾向にあるのと、ＩＧＢＴ（Insulated Gate. Bipolar Transistor）による、パルス波の高精度化も進んでおり、電食を防止するためには、従来よりも絶縁軸受を高インピーダンス化する必要がでてきている。   In motor control, the carrier frequency of PWM (Pulse width modulation) control tends to be higher, and IGBT (Insulated Gate Bipolar Transistor) is also improving the accuracy of pulse waves, preventing electric corrosion. In order to achieve this, it has become necessary to increase the impedance of the insulated bearing as compared with the prior art.

また、従来は、鉄道車両用のトラクションモーターに絶縁被膜付き軸受が使われるケースが多く、外径１００〜２５０ｍｍ程度のものであったが、より大型の装置にも使用されるようになり、キャパシタンス特性の改善が課題となっている。   Conventionally, there are many cases in which a bearing with an insulating coating is used for a traction motor for a railway vehicle, which has an outer diameter of about 100 to 250 mm. Improvement of characteristics is an issue.

本発明は、上述したような事情に鑑みてなされたものであって、高インピーダンス化を図ることにより、電食を防止することができる、転がり軸受を提供することを目的とする。   This invention is made | formed in view of the above situations, Comprising: It aims at providing the rolling bearing which can prevent an electric corrosion by achieving high impedance.

上記の目的を達成するため、本発明に係る転がり軸受は、軌道輪に絶縁被膜を施した転がり軸受において、
前記軌道輪の取付け面に、窪み部又は突起部が設けてあることを特徴とする。 In order to achieve the above object, a rolling bearing according to the present invention is a rolling bearing in which an insulating film is applied to a bearing ring.
The mounting surface of the bearing ring is provided with a recess or a protrusion.

好適には、前記絶縁被膜が施される外輪の外径面又は内輪の内径面の軸方向の一部に、溝若しくは突起部が設けてある。   Preferably, a groove or a protrusion is provided in a part in the axial direction of the outer diameter surface of the outer ring or the inner diameter surface of the inner ring on which the insulating coating is applied.

また、好適には、前記絶縁被膜が施される外輪の外径面又は内輪の内径面に、部分的な窪み部若しくは突起部が設けてある。   Preferably, a partial recess or protrusion is provided on the outer diameter surface of the outer ring or the inner diameter surface of the inner ring on which the insulating coating is applied.

さらに、好適には、前記絶縁被膜が施される外輪の端面に段差を設ける構成として、嵌合される外輪の端面とハウジング部品との接触面積を小さくすると共に、ハウジング部品の接触部分と外輪の内径面の金属の露出部分との距離である沿面距離を長く設定することにより、沿面放電を抑える。   Further, preferably, as a configuration in which a step is provided on the end surface of the outer ring to which the insulating coating is applied, the contact area between the end surface of the outer ring to be fitted and the housing part is reduced, and the contact part of the housing part and the outer ring are Creeping discharge is suppressed by setting a long creepage distance, which is a distance from the exposed portion of the metal on the inner diameter surface.

さらに、好適には、前記絶縁被膜が施される内輪の端面に段差を設ける構成として、嵌合される内輪の端面と軸の端面との接触面積を小さくすると共に、軸の端面の接触部分と内輪の外径の金属の露出部分との距離である沿面距離を長く設定することにより、沿面放電を抑える。   Furthermore, preferably, as a configuration in which a step is provided on the end face of the inner ring to which the insulating coating is applied, the contact area between the end face of the inner ring to be fitted and the end face of the shaft is reduced, and the contact portion of the end face of the shaft is Creeping discharge is suppressed by setting a long creepage distance, which is a distance from the exposed metal portion of the outer diameter of the inner ring.

本発明によれば、絶縁被膜付きの転がり軸受の高インピーダンス化を図ることにより、電食を防止することができる。   According to the present invention, electrolytic corrosion can be prevented by increasing the impedance of a rolling bearing with an insulating coating.

以下、本発明の実施の形態に係る転がり軸受を図面を参照しつつ説明する。   Hereinafter, a rolling bearing according to an embodiment of the present invention will be described with reference to the drawings.

本発明の実施の形態の前提として、キャパシタンスＣは、電極間の距離：ｄ、対向する電極の面積：Ｓ、誘電率：ε０、絶縁被膜となる材料の比誘電率：εｍ、によって次式で示される。

Figure 2007298060
これによれば、Ｃを小さくするためには、ｄに相当する絶縁被膜の膜厚を増してもよいが、溶射でセラミック被膜を形成する場合、溶射時間が長くなり、高コストとなる。また、被膜が厚くなれば、衝撃が加わった際の機械的強度の低下や熱伝導性が損なわれることになり、機能上も好ましくない。 As a premise of the embodiment of the present invention, the capacitance C is determined by the distance between the electrodes: d, the area of the opposing electrodes: S, the dielectric constant: ε 0 , and the relative dielectric constant of the material to be an insulating film: ε m . It is shown by the formula.
Figure 2007298060
 According to this, in order to reduce C, the film thickness of the insulating coating corresponding to d may be increased. However, when the ceramic coating is formed by thermal spraying, the spraying time becomes long and the cost becomes high. Moreover, if the film is thick, the mechanical strength is lowered and the thermal conductivity is impaired when an impact is applied, which is not preferable in terms of function.

また、被膜材料の変更により、εｍを改善する方法も考えられる。絶縁被膜には、耐熱性、熱伝導率、絶縁抵抗、絶縁破壊電圧、機械的強度、加工性などの点から、アルミナ（Ａ１２Ｏ３）、チタニア（ＴｉＯ２）、ジルコニア（ＺｒＯ２−Ｙ２Ｏ３）等のセラミック素材や、ＰＰＳ樹脂ベースの樹脂材料が用いられている。これら被膜材料の配合、セラミック溶射被膜の封孔処置のための樹脂材料等により、誘電率εｍは、若干の変化はするが、εｍの大幅な低減は望めない。 Further, by changing the coating material, a method of improving the epsilon m also conceivable. Insulating coatings include alumina (A1 2 O 3 ), titania (TiO 2 ), zirconia (ZrO 2 —Y) in terms of heat resistance, thermal conductivity, insulation resistance, breakdown voltage, mechanical strength, workability, and the like. Ceramic materials such as 2 O 3 ) and PPS resin-based resin materials are used. Although the dielectric constant ε m varies slightly depending on the blending of these coating materials and the resin material for sealing the ceramic sprayed coating, a significant reduction in ε m cannot be expected.

本実施の形態は、大略的には、絶縁被膜を施した軌道輪の取付け面積を減らすことにより、絶縁被膜付きの転がり軸受の絶縁特性を改善する。具体的には、はめあい面となる外輪外径、内輪内径、およびそれぞれの軌道輪の端面に、窪み部又は突起部を設けることで実現する。このように、本実施の形態によれば、絶縁被膜付き転がり軸受の高インピーダンス化が可能になる。また、端面外径側に突起部を設けた形状の場合、沿面距離が長くなるので、沿面放電の危険の回避にも役立つ。   In this embodiment, the insulating characteristics of the rolling bearing with the insulating coating are improved by reducing the mounting area of the bearing ring with the insulating coating. Specifically, it is realized by providing a recess or a protrusion on the outer ring outer diameter, the inner ring inner diameter, and the end faces of the respective race rings that serve as fitting surfaces. Thus, according to the present embodiment, it is possible to increase the impedance of a rolling bearing with an insulating coating. Further, in the case of a shape having a protrusion on the outer diameter side of the end surface, the creeping distance becomes longer, which helps to avoid the risk of creeping discharge.

（第１実施の形態）
図１（ａ）は、本発明の第１実施の形態に係る転がり軸受の断面図であり、（ｂ）は、その変形例に係る転がり軸受の断面図である。 (First embodiment)
Fig.1 (a) is sectional drawing of the rolling bearing which concerns on 1st Embodiment of this invention, (b) is sectional drawing of the rolling bearing which concerns on the modification.

本実施の形態では、外輪１と内輪２との間に、転動体３（玉）が転動自在に介装してあり、転動体３を保持するための保持器４が設けてある。外輪１の外径面と両端面には、絶縁被膜５が施してある。   In the present embodiment, a rolling element 3 (ball) is interposed between the outer ring 1 and the inner ring 2 so as to roll freely, and a cage 4 for holding the rolling element 3 is provided. An insulating coating 5 is applied to the outer diameter surface and both end surfaces of the outer ring 1.

本実施の形態は、外輪１の外径面の幅方向に、部分的に窪み部１０（溝）を設けたものである。   In the present embodiment, a recess 10 (groove) is partially provided in the width direction of the outer diameter surface of the outer ring 1.

図１（ａ）に示すように、外輪１の外径面の略中央部には、所定幅の窪み部１０（溝）が円周方向に延在して形成してある。これにより、絶縁被膜付きの転がり軸受の高インピーダンス化を図ることにより、電食を防止することができる。   As shown in FIG. 1 (a), a recess 10 (groove) having a predetermined width is formed in a substantially central portion of the outer diameter surface of the outer ring 1 so as to extend in the circumferential direction. Thereby, electric corrosion can be prevented by increasing the impedance of the rolling bearing with the insulating coating.

外径面の窪み部１０（溝）とハウジング部品との間に、空隙がある方がより高インピーダンスとなるが、軸受据え付けの安定性や熱伝導性が低下するので、荷重条件や発熱量などの使用条件にも鑑み、最適な形状設計を行えばよい。   There is a higher impedance if there is a gap between the outer surface recess 10 (groove) and the housing part, but the stability of the bearing installation and thermal conductivity are reduced, so the load conditions, heat generation, etc. In view of the use conditions, an optimal shape design may be performed.

また、窪み部１０（溝）は、図１（ｂ）に示すように、複数列（二列）としてもよい。   Moreover, as shown in FIG.1 (b), the hollow part 10 (groove) is good also as multiple rows | lines (two rows).

さらに、絶縁被膜５は、図１（ａ）のように、厚さを均一に形成してもよいし、窪み部１０（溝）を埋める形で、図１（ｂ）のように、外径面を平らに仕上げてもよい。   Further, the insulating coating 5 may be formed to have a uniform thickness as shown in FIG. 1 (a), or the outer diameter of the insulating coating 5 as shown in FIG. The surface may be finished flat.

なお、平らな円筒面に絶縁被膜５を均一に形成する場合より、部分的に段部がある方が絶縁被膜５は、機械的にも安定する。   Note that the insulating coating 5 is mechanically more stable when it has a stepped portion than when the insulating coating 5 is uniformly formed on a flat cylindrical surface.

（第２実施の形態）
図２（ａ）は、本発明の第２実施の形態に係る転がり軸受の外輪の斜視図であり、（ｂ）は、その変形例に係る転がり軸受の外輪の斜視図である。 (Second Embodiment)
FIG. 2A is a perspective view of the outer ring of the rolling bearing according to the second embodiment of the present invention, and FIG. 2B is a perspective view of the outer ring of the rolling bearing according to the modification.

本実施の形態は、外輪１の外径面に、部分的な窪み部１０を設けたものである。図２（ａ）では、窪み部１０は、長円又は楕円形状などの曲線形状に形成した凹状部であり、図２（ｂ）では、窪み部１０は、略Ｘ形状などの曲線形状に形成した凹状部である。   In the present embodiment, a partial recess 10 is provided on the outer diameter surface of the outer ring 1. In FIG. 2A, the hollow portion 10 is a concave portion formed in a curved shape such as an ellipse or an ellipse. In FIG. 2B, the hollow portion 10 is formed in a curved shape such as a substantially X shape. It is a concave part.

窪み部１０の形状は、どのようなものでも良いが、エッジがあると、そこに電荷が集中しやすくなるので、なるべく丸まっている方が望ましい。   The shape of the indentation 10 may be any shape, but if there is an edge, the electric charge tends to concentrate there.

また、軸受としての要求性能を維持できるように、使用条件にあわせて、窪み部１０の数や形状を設計すればよい。   Moreover, what is necessary is just to design the number and shape of the hollow part 10 according to a use condition so that the required performance as a bearing can be maintained.

（第３実施の形態）
図３（ａ）は、本発明の第３実施の形態に係る転がり軸受の半断面図であり、（ｂ）は、その変形例に係る転がり軸受の半断面図である。 (Third embodiment)
FIG. 3A is a half sectional view of a rolling bearing according to a third embodiment of the present invention, and FIG. 3B is a half sectional view of a rolling bearing according to the modification.

本実施の形態は、外輪１に、部分的な突起部２０を設けたものである。図３（ａ）は、外輪１の外径面に、突起部２０を設けたものであり、また、外輪１の両端面には、突起部２１，２１が設けてある。   In the present embodiment, a partial protrusion 20 is provided on the outer ring 1. 3A, the outer ring 1 is provided with a protrusion 20 on the outer diameter surface, and the outer ring 1 is provided with protrusions 21 and 21 on both end faces.

この場合も、同様に、突起部２０，２１の数や形状は、使用条件に合せて設計すればよい。   In this case as well, the number and shape of the protrusions 20 and 21 may be designed according to the use conditions.

被膜は、窪み部１０（溝、図１）や窪み部１０（図２）を設けた場合と同様に、均一な厚さで形成してもよいし、突起部２０，２１を埋没させる形で、表面を平らに仕上げてもよい。   The coating may be formed with a uniform thickness as in the case where the recess 10 (groove, FIG. 1) or the recess 10 (FIG. 2) is provided, or the projections 20 and 21 are buried. The surface may be finished flat.

絶縁被膜５が施される外輪１の端面に突起部２１を設けた場合は、図３（ｂ）に示すように、外輪１の端面と内径面に段差ができ、嵌合される外輪１の端面とハウジング部品の接触面積を小さくすると共に、ハウジング部品の接触部分と外輪１の軌道面（内径面）の金属の露出部分との距離（即ち、沿面距離：Ｌ、図３（ｂ）参照）を長く設定できるので、沿面放電の発生を抑制することができる効果もある。   When the protrusion 21 is provided on the end surface of the outer ring 1 to which the insulating coating 5 is applied, as shown in FIG. 3B, a step is formed between the end surface of the outer ring 1 and the inner diameter surface of the outer ring 1 to be fitted. The contact area between the end surface and the housing part is reduced, and the distance between the contact part of the housing part and the exposed metal part of the raceway surface (inner diameter surface) of the outer ring 1 (that is, creepage distance: L, see FIG. 3B) Therefore, it is possible to suppress the occurrence of creeping discharge.

以上、転がり軸受の外輪１に絶縁被膜５を施した例を示したが、これが内輪２であっても、同様である。   Although the example in which the insulating coating 5 is applied to the outer ring 1 of the rolling bearing has been described above, the same applies to the inner ring 2.

すなわち、特に図示しないが、絶縁被膜が施される内輪の端面と外径面に段差を設ける構成として、嵌合される内輪の端面と軸の端面の接触面積を小さくすると共に、軸の端面の接触部分と内輪の外径の金属の露出部分との距離である沿面距離を長く設定することにより、沿面放電を抑えることができる。   That is, although not particularly illustrated, as a configuration in which a step is provided between the end surface and the outer diameter surface of the inner ring to which the insulating coating is applied, the contact area between the end surface of the inner ring to be fitted and the end surface of the shaft is reduced, and the end surface of the shaft is By setting the creepage distance, which is the distance between the contact portion and the exposed metal portion of the outer diameter of the inner ring, to be long, creeping discharge can be suppressed.

なお、本発明は、上述した実施の形態に限定されず、種々変形可能である。例えば、本発明は、転がり軸受であれば、玉軸受に限らず、ころ軸受でも適用が可能である。   In addition, this invention is not limited to embodiment mentioned above, A various deformation | transformation is possible. For example, the present invention is applicable not only to ball bearings but also to roller bearings as long as it is a rolling bearing.

（ａ）は、本発明の第１実施の形態に係る転がり軸受の断面図であり、（ｂ）は、その変形例に係る転がり軸受の断面図である。(A) is sectional drawing of the rolling bearing which concerns on 1st Embodiment of this invention, (b) is sectional drawing of the rolling bearing which concerns on the modification. （ａ）は、本発明の第２実施の形態に係る転がり軸受の外輪の斜視図であり、（ｂ）は、その変形例に係る転がり軸受の外輪の斜視図である。(A) is a perspective view of the outer ring | wheel of the rolling bearing which concerns on 2nd Embodiment of this invention, (b) is a perspective view of the outer ring | wheel of the rolling bearing which concerns on the modification. （ａ）は、本発明の第３実施の形態に係る転がり軸受の半断面図であり、（ｂ）は、その変形例に係る転がり軸受の半断面図である。(A) is a half sectional view of a rolling bearing according to a third embodiment of the present invention, and (b) is a half sectional view of a rolling bearing according to a modification thereof.

符号の説明Explanation of symbols

１ 外輪
２ 内輪
３ 転動体
４ 保持器
５ 絶縁被膜
１０ 窪み部
２０，２１ 突起部 DESCRIPTION OF SYMBOLS 1 Outer ring 2 Inner ring 3 Rolling element 4 Cage 5 Insulating film 10 Depression part 20,21 Protrusion part

Claims (5)

軌道輪に絶縁被膜を施した転がり軸受において、
前記軌道輪の取付け面に、窪み部又は突起部が設けてあることを特徴とする転がり軸受。 In rolling bearings with insulating coatings on bearing rings,
A rolling bearing, wherein a recess or a protrusion is provided on a mounting surface of the bearing ring. 前記絶縁被膜が施される外輪の外径面又は内輪の内径面の軸方向の一部に、溝若しくは突起部が設けてあることを特徴とする請求項１に記載の転がり軸受。   The rolling bearing according to claim 1, wherein a groove or a protrusion is provided in a part of an axial direction of an outer diameter surface of the outer ring or an inner diameter surface of the inner ring on which the insulating coating is applied. 前記絶縁被膜が施される外輪の外径面又は内輪の内径面に、部分的な窪み部若しくは突起部が設けてあることを特徴とする請求項１に記載の転がり軸受。   The rolling bearing according to claim 1, wherein a partial recess or protrusion is provided on the outer diameter surface of the outer ring or the inner diameter surface of the inner ring to which the insulating coating is applied. 前記絶縁被膜が施される外輪の端面に段差を設ける構成として、嵌合される外輪の端面とハウジング部品との接触面積を小さくすると共に、ハウジング部品の接触部分と外輪の内径面の金属の露出部分との距離である沿面距離を長く設定することにより、沿面放電を抑えることを特徴とする請求項１乃至３の何れか１項に記載の転がり軸受。   As a configuration in which a step is provided on the end surface of the outer ring to which the insulating coating is applied, the contact area between the end surface of the outer ring to be fitted and the housing part is reduced, and the exposed portion of the metal of the contact part of the housing part and the inner surface of the outer ring is exposed. The rolling bearing according to any one of claims 1 to 3, wherein creeping discharge is suppressed by setting a creeping distance that is a distance to a portion long. 前記絶縁被膜が施される内輪の端面に段差を設ける構成として、嵌合される内輪の端面と軸の端面との接触面積を小さくすると共に、軸の端面の接触部分と内輪の外径の金属の露出部分との距離である沿面距離を長く設定することにより、沿面放電を抑えることを特徴とする請求項１乃至３の何れか１項に記載の転がり軸受。   As a structure in which a step is provided on the end face of the inner ring to which the insulating coating is applied, the contact area between the end face of the inner ring to be fitted and the end face of the shaft is reduced, and the contact portion of the end face of the shaft and the outer diameter metal of the inner ring The rolling bearing according to any one of claims 1 to 3, wherein creeping discharge is suppressed by setting a creeping distance that is a distance to the exposed portion of the steel sheet to be long.
JP2006124172A 2006-04-27 2006-04-27 Rolling bearing Withdrawn JP2007298060A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2006124172A JP2007298060A (en) 2006-04-27 2006-04-27 Rolling bearing

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10823229B2 (en) 2017-03-24 2020-11-03 Aktiebolaget Skf Rolling-element bearing including an electrically insulating layer
WO2022092070A1 (en) 2020-10-29 2022-05-05 Ntn株式会社 Insulated bearing device
JP7065739B2 (en) 2018-09-21 2022-05-12 Ntn株式会社 Axle bearing equipment
KR20240050370A (en) 2021-08-24 2024-04-18 엔티엔 가부시키가이샤 bearing device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10823229B2 (en) 2017-03-24 2020-11-03 Aktiebolaget Skf Rolling-element bearing including an electrically insulating layer
JP7065739B2 (en) 2018-09-21 2022-05-12 Ntn株式会社 Axle bearing equipment
WO2022092070A1 (en) 2020-10-29 2022-05-05 Ntn株式会社 Insulated bearing device
KR20230118555A (en) 2020-10-29 2023-08-11 엔티엔 가부시키가이샤 insulated bearing device
KR20240050370A (en) 2021-08-24 2024-04-18 엔티엔 가부시키가이샤 bearing device

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