JP2009243618A

JP2009243618A - Rolling bearing

Info

Publication number: JP2009243618A
Application number: JP2008092503A
Authority: JP
Inventors: Kazuhiro Takio; 和弘瀧尾
Original assignee: NSK Ltd
Current assignee: NSK Ltd
Priority date: 2008-03-31
Filing date: 2008-03-31
Publication date: 2009-10-22

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electroerosion-preventing rolling bearing, which is difficult to cause damage at a fitting part to a housing or a shaft, deterioration of an insulating performance during carrying or handling, and cracks even in a high surface pressure purpose. <P>SOLUTION: An inner ring 1 is constituted by a first steel annular body 11 and a second steel annular body 12 split in a thickness direction (radial direction), and a ceramics body 13 arranged between both of the steel annular bodies. The ceramics body 13 includes two ceramics split bodies 13a, 13b split in the circumferential direction. The two ceramics split bodies 13a, 13b are made of AlN (aluminum nitride) sintered body, and dimensioned to cause a gap between both of them. An inner ring track groove 11a is formed on an outer periphery of the first steel annular body 11. An outer ring 2 is an integrated object made of steel, and an outer ring track groove 2a is formed on an inner periphery. A ball 3 is made of steel. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は転がり軸受に関し、特に、電食が生じ難くなる工夫がなされた転がり軸受（電食防止転がり軸受）に関する。 The present invention relates to a rolling bearing, and more particularly to a rolling bearing (electric corrosion-preventing rolling bearing) that has been devised to prevent the occurrence of electrolytic corrosion.

家電機器用モータ（ファンモータ、クリーナモータ、洗濯機モータ）、クリーンルーム用ファンモータ、換気扇用モータ、給湯器用モータのように、比較的小型モータであり、インバータ制御回路を有するモータ等に使用されている転がり軸受は、静電現象によって軌道輪と転動体との間に生じる電食を防止する必要がある。また、鉄道車両用モータに使用される転がり軸受には、モータの電流を車輪からレールへ接地する集電装置が正常に作動しない場合に、電食が生じる恐れがある。また、風力発電用の軸受においても電食による損傷が生じることがある。 Motors for home appliances (fan motors, cleaner motors, washing machine motors), clean room fan motors, ventilation fan motors, water heater motors, etc., are relatively small motors and are used for motors with inverter control circuits, etc. It is necessary for a rolling bearing to prevent electrolytic corrosion generated between the race and the rolling element due to an electrostatic phenomenon. Further, in rolling bearings used for railway vehicle motors, there is a possibility that electric corrosion may occur when a current collector for grounding the motor current from the wheel to the rail does not operate normally. In addition, damage due to electrolytic corrosion may occur in a bearing for wind power generation.

そのため、例えば、外輪の外周または外周から端面に亙って、あるいは内輪の内周または内周から端面に亙って絶縁層（絶縁被膜）を設けたり、転動体をセラミックス材料からなるものとすることが提案されている（例えば下記の特許文献１〜３を参照）。なお、特許文献１の方法では絶縁層の外側に金属層を設けているが、具体的には、セラミックス溶射法で形成した絶縁層の外側に、金属パウダの溶射により金属層を設けている。
実開平２−４６１１９号公報実開平２−１１２２３号公報特開２００２−１３９０４８号公報 Therefore, for example, an insulating layer (insulating coating) is provided from the outer periphery or outer periphery to the end surface of the outer ring, or from the inner periphery or inner periphery to the end surface of the inner ring, or the rolling element is made of a ceramic material. (For example, refer to Patent Documents 1 to 3 below). In the method of Patent Document 1, a metal layer is provided outside the insulating layer. Specifically, the metal layer is provided outside the insulating layer formed by a ceramic spraying method by thermal spraying with a metal powder.
Japanese Utility Model Publication No. 2-46119 Japanese Utility Model Publication No. 2-11223 JP 2002-139048 A

しかしながら、上述のような、外輪または内輪（のハウジングまたは軸との嵌め合い部）にセラミックス溶射法で絶縁層（セラミックス薄膜）を設ける方法では、ハウジングまたは軸との嵌め合い部に損傷が生じ易く、運搬時や取り扱い時などに、セラミックス薄膜に割れや剥離が生じ易い。また、溶射法でセラミックス薄膜を形成した部分の寸法精度を良好にするために、研削仕上げなどの後加工を行った場合には、セラミックス薄膜が薄くなり過ぎて絶縁性能が不充分となる恐れがある。一方、セラミックス絶縁膜は、厚さを厚くするほど運搬時や取り扱い時等に割れやすくなるため、割れにくく絶縁性能も良好なセラミックス薄膜を得ることは難しい。 However, in the method of providing the insulating layer (ceramic thin film) by the ceramic spraying method on the outer ring or the inner ring (the fitting portion with the housing or the shaft) as described above, the fitting portion with the housing or the shaft is easily damaged. The ceramic thin film is easily cracked or peeled off during transportation or handling. In addition, when post-processing such as grinding finish is performed to improve the dimensional accuracy of the part where the ceramic thin film is formed by the thermal spraying method, the ceramic thin film may become too thin and the insulation performance may be insufficient. is there. On the other hand, as the thickness of the ceramic insulating film increases, the ceramic thin film becomes more easily broken during transportation or handling, so that it is difficult to obtain a ceramic thin film that is hard to break and has good insulation performance.

また、セラミックス製転動体を用いる方法では、コストが高くなることと、面圧が高い用途（鉄道車両用モータ、航空機用モータ、風力発電用モータなど）で割れが生じやすく、寿命にバラツキが大きいため信頼性が低いという問題がある。
本発明の課題は、ハウジングまたは軸との嵌め合い部に損傷が生じにくく、運搬時や取り扱い時に絶縁性能の低下が生じにくく、面圧が高い用途でも割れが生じにくい、電食防止転がり軸受を提供することである。 In the method using a ceramic rolling element, the cost is high and cracks are likely to occur in applications with high surface pressure (such as motors for railway vehicles, motors for aircraft, and motors for wind power generation), and the life varies greatly. Therefore, there is a problem that the reliability is low.
It is an object of the present invention to provide an electric corrosion-preventing rolling bearing that is less likely to be damaged in a fitting portion with a housing or a shaft, is less likely to be deteriorated in insulation performance during transportation or handling, and is less likely to be cracked even in a high surface pressure application. Is to provide.

上記課題を解決するために、本発明の転がり軸受は、転動体は金属製であり、内輪および外輪の一方または両方は、厚さ方向（径方向）で分割された第１の鋼製環状体および第２の鋼製環状体と、両鋼製環状体の間に配置されたセラミックス体と、で構成されている。
前記セラミックス体は、周方向に分割された複数のセラミックス分割体からなることが好ましい。 In order to solve the above-described problems, in the rolling bearing of the present invention, the rolling element is made of metal, and one or both of the inner ring and the outer ring are divided in the thickness direction (radial direction). And a second steel annular body and a ceramic body disposed between both steel annular bodies.
The ceramic body is preferably composed of a plurality of ceramic divided bodies divided in the circumferential direction.

本発明の転がり軸受によれば、転動体が金属製であるため、転動体がセラミックス製の場合と比較して、面圧が高い用途でも割れが生じにくい。また、内輪または外輪が、厚さ方向で分割された第１の鋼製環状体および第２の鋼製環状体と、両鋼製環状体の間に配置されたセラミックス体と、で構成されているため、外輪または内輪のハウジングまたは軸との嵌め合い部にセラミックス溶射法で形成された絶縁層を有する場合と比較して、ハウジングまたは軸との嵌め合い部に損傷が生じにくく、運搬時や取り扱い時に絶縁性能の低下が生じにくい。
また、セラミックス体を、周方向に分割された二つまたは二つ以上のセラミックス分割体からなるものとすることで、分割されていないものとした場合と比較して、内輪または外輪を製造し易いとともに、セラミックス体に割れが生じにくい。 According to the rolling bearing of the present invention, since the rolling element is made of metal, cracking is less likely to occur even in applications where the surface pressure is higher than when the rolling element is made of ceramics. Further, the inner ring or the outer ring is composed of a first steel annular body and a second steel annular body divided in the thickness direction, and a ceramic body disposed between the both steel annular bodies. Therefore, compared with the case where the outer ring or the inner ring is fitted with the housing or shaft, the fitting portion with the housing or the shaft is less likely to be damaged compared to the case where an insulating layer formed by a ceramic spray method is used. Insulation performance is unlikely to deteriorate during handling.
Moreover, by making the ceramic body into two or more ceramic division bodies divided in the circumferential direction, it is easier to manufacture the inner ring or the outer ring than in the case where the ceramic body is not divided. At the same time, the ceramic body is hardly cracked.

本発明の転がり軸受によれば、ハウジングまたは軸との嵌め合い部に損傷が生じにくく、運搬時や取り扱い時に絶縁性能の低下が生じにくく、面圧が高い用途でも割れが生じにくい。 According to the rolling bearing of the present invention, the fitting portion with the housing or the shaft is less likely to be damaged, the insulation performance is less likely to be reduced during transportation or handling, and cracking is less likely to occur even in applications where the surface pressure is high.

以下、本発明の実施形態について説明する。
図１は、本発明の第１実施形態に相当する転がり軸受を示す断面図である。
この実施形態の転がり軸受は、内輪１と、外輪２と、複数の玉（転動体）３と、保持器とからなる。図１において、玉３は、１個だけが表示され、それ以外の玉と保持器は省略されている。図２は図１のＡ−Ａ断面図であって、内輪１を示す。 Hereinafter, embodiments of the present invention will be described.
FIG. 1 is a sectional view showing a rolling bearing corresponding to the first embodiment of the present invention.
The rolling bearing according to this embodiment includes an inner ring 1, an outer ring 2, a plurality of balls (rolling elements) 3, and a cage. In FIG. 1, only one ball 3 is displayed, and other balls and cages are omitted. FIG. 2 is a cross-sectional view taken along the line AA of FIG.

この実施形態において、内輪１は、厚さ方向（径方向）で分割された第１の鋼製環状体１１および第２の鋼製環状体１２と、両鋼製環状体の間に配置されたセラミックス体１３と、で構成されている。セラミックス体１３は、周方向に分割された二つのセラミックス分割体１３ａ，１３ｂからなる。二つのセラミックス分割体１３ａ，１３ｂは、ＡｌＮ（窒化アルミニウム）焼結体からなり、両者の間に隙間が生じる寸法に形成されている。第１の鋼製環状体１１の外周面には、内輪軌道溝１１ａが形成されている。 In this embodiment, the inner ring 1 is disposed between the first steel annular body 11 and the second steel annular body 12 divided in the thickness direction (radial direction), and both steel annular bodies. And a ceramic body 13. The ceramic body 13 includes two ceramic divided bodies 13a and 13b divided in the circumferential direction. The two ceramic divided bodies 13a and 13b are made of an AlN (aluminum nitride) sintered body, and are formed to have a dimension in which a gap is formed between them. An inner ring raceway groove 11 a is formed on the outer peripheral surface of the first steel annular body 11.

外輪２は鋼製の一体物であり、内周面に外輪軌道溝２ａが形成されている。玉３は鋼製である。
この実施形態では、内輪１を以下の方法で作製した。
第１の鋼製環状体１１の内径を、セラミックス分割体１３ａ，１３ｂの外径より２０〜２００μｍ小さくし、第２の鋼製環状体１２の外径を、セラミックス分割体１３ａ，１３ｂの内径とほぼ等しい寸法にしておく。そして、先ず、セラミックス分割体１３ａ，１３ｂを第２の鋼製環状体１２の外側に配置し、その外側に第１の鋼製環状体１１を加熱しながら嵌める（焼き嵌め）。 The outer ring 2 is an integral body made of steel, and an outer ring raceway groove 2a is formed on the inner peripheral surface. The ball 3 is made of steel.
In this embodiment, the inner ring 1 was produced by the following method.
The inner diameter of the first steel annular body 11 is made smaller by 20 to 200 μm than the outer diameter of the ceramic divided bodies 13a and 13b, and the outer diameter of the second steel annular body 12 is made equal to the inner diameter of the ceramic divided bodies 13a and 13b. Keep the dimensions approximately equal. First, the ceramic divided bodies 13a and 13b are arranged outside the second steel annular body 12, and the first steel annular body 11 is fitted to the outside while heating (shrink fitting).

これにより、第１の鋼製環状体１１からの押圧力がセラミックス分割体１３ａ，１３ｂに作用して、セラミックス分割体１３ａ，１３ｂが第２の鋼製環状体１２に押されるため、両鋼製環状体１１，１２の間に二つのセラミックス分割体１３ａ，１３ｂが挟まれた状態で一体化される。その際に、二つのセラミックス分割体１３ａ，１３ｂは、間に隙間があるため、割れにくい。この隙間にゴムなどの詰め物を入れてもよい。 As a result, the pressing force from the first steel annular body 11 acts on the ceramic divided bodies 13a and 13b, and the ceramic divided bodies 13a and 13b are pushed by the second steel annular body 12. The two ceramic divided bodies 13a and 13b are integrated with each other between the annular bodies 11 and 12. At that time, the two ceramic divided bodies 13a and 13b are difficult to break because there is a gap between them. You may put stuffing, such as rubber | gum, in this clearance gap.

このように、第１の鋼製環状体１１と第２の鋼製環状体１２とセラミックス分割体１３ａ，１３ｂが一体化された状態で、第１の鋼製環状体１１の外周面に内輪軌道溝１１ａを形成し、内周面を仕上げ加工する。
この実施形態の転がり軸受によれば、外輪２と玉３は鋼製であるが、内輪１が鋼製環状体１１，１２とセラミックス分割体１３ａ，１３ｂとからなるため、電食防止性能を有する。また、ハウジングおよび軸との嵌め合い部、すなわち、外輪２の外周面および内輪１の内周面が鋼製の面であるため、損傷が生じにくい。また、転動体３が鋼製であるため、面圧が高い用途でも割れが生じにくい。 Thus, the inner ring raceway is formed on the outer peripheral surface of the first steel annular body 11 in a state where the first steel annular body 11, the second steel annular body 12, and the ceramic divided bodies 13a and 13b are integrated. The groove 11a is formed and the inner peripheral surface is finished.
According to the rolling bearing of this embodiment, the outer ring 2 and the ball 3 are made of steel, but the inner ring 1 is made of the steel annular bodies 11 and 12 and the ceramic divided bodies 13a and 13b. . Further, since the fitting portion between the housing and the shaft, that is, the outer peripheral surface of the outer ring 2 and the inner peripheral surface of the inner ring 1 are steel surfaces, damage is unlikely to occur. Moreover, since the rolling element 3 is made of steel, cracks are unlikely to occur even in applications where the surface pressure is high.

この実施形態では、両鋼製環状体１１，１２の間に二つのセラミックス分割体１３ａ，１３ｂを配置したが、両鋼製環状体１１，１２の間に配置するセラミックス体は三つ以上のセラミックス分割体からなるものとしてもよい。
また、この実施形態では、セラミックス分割体１３ａ，１３ｂを、絶縁体からなり熱伝導度が１５０〜２４０Ｗ／ｍｋ程度と高いＡｌＮ（窒化アルミニウム）製としたが、高い熱伝導度が低くてもよい場合には、これ以外のセラミックス、例えば、Ａｌ₂Ｏ₃（アルミナ）、Ｓｉ₃Ｎ₄（窒化珪素）、ＺｒＯ₂（ジルコニア）などを用いてもよい。Ｓｉ₃Ｎ₄（窒化珪素）とＺｒＯ₂（ジルコニア）は破壊靱性値が高い。 In this embodiment, the two ceramic divided bodies 13a and 13b are arranged between the two steel annular bodies 11 and 12, but the ceramic body arranged between the two steel annular bodies 11 and 12 is three or more ceramics. It is good also as what consists of a division body.
In this embodiment, the ceramic divided bodies 13a and 13b are made of an insulator and made of AlN (aluminum nitride) having a high thermal conductivity of about 150 to 240 W / mk. However, the high thermal conductivity may be low. In some cases, other ceramics such as Al ₂ O ₃ (alumina), Si ₃ N ₄ (silicon nitride), ZrO ₂ (zirconia), etc. may be used. Si ₃ N ₄ (silicon nitride) and ZrO ₂ (zirconia) have high fracture toughness values.

また、セラミックス分割体１３ａ，１３ｂとして、表面をショットブラストやボールミル工程などで強靱化した強靱化セラミックス製としてもよい。
また、この実施形態では、焼き嵌めで鋼製環状体１１，１２とセラミックス分割体１３ａ，１３ｂを一体化しているが、接着剤を用いて一体化してもよい。
図３は、本発明の第２実施形態に相当する転がり軸受を示す断面図である。 The ceramic divided bodies 13a and 13b may be made of a toughened ceramic whose surface is toughened by shot blasting or a ball mill process.
Moreover, in this embodiment, although the steel annular bodies 11 and 12 and the ceramic division bodies 13a and 13b are integrated by shrink fitting, you may integrate using an adhesive agent.
FIG. 3 is a sectional view showing a rolling bearing corresponding to the second embodiment of the present invention.

この実施形態の転がり軸受は、内輪１と、外輪２と、複数の玉（転動体）３と、保持器とからなる。図３において、玉３は、１個だけが表示され、それ以外の玉と保持器は省略されている。図４は図３のＢ−Ｂ断面図であって、外輪２を示す。
この実施形態において、外輪２は、厚さ方向（径方向）で分割された第１の鋼製環状体２１および第２の鋼製環状体２２と、両鋼製環状体の間に配置されたセラミックス体２３と、で構成されている。セラミックス体２３は、周方向に分割された二つのセラミックス分割体２３ａ，２３ｂからなる。二つのセラミックス分割体２３ａ，２３ｂは、ＡｌＮ（窒化アルミニウム）焼結体からなり、両者の間に隙間が生じる寸法に形成されている。第１の鋼製環状体２１の内周面には、外輪軌道溝２１ａが形成されている。 The rolling bearing according to this embodiment includes an inner ring 1, an outer ring 2, a plurality of balls (rolling elements) 3, and a cage. In FIG. 3, only one ball 3 is displayed, and other balls and cages are omitted. FIG. 4 is a cross-sectional view taken along the line BB of FIG. 3 and shows the outer ring 2.
In this embodiment, the outer ring 2 is disposed between the first steel annular body 21 and the second steel annular body 22 divided in the thickness direction (radial direction), and both steel annular bodies. And a ceramic body 23. The ceramic body 23 includes two ceramic divided bodies 23a and 23b divided in the circumferential direction. The two ceramic divided bodies 23a and 23b are made of an AlN (aluminum nitride) sintered body, and are formed to have a dimension in which a gap is formed between them. An outer ring raceway groove 21 a is formed on the inner peripheral surface of the first steel annular body 21.

内輪１は鋼製の一体物であり、外周面に内輪軌道溝１ａが形成されている。玉３は鋼製である。
この実施形態では、外輪２を以下の方法で作製した。
第２の鋼製環状体２２の内径を、セラミックス分割体２３ａ，２３ｂの外径より２０〜２００μｍ小さくし、第１の鋼製環状体２１の外径を、セラミックス分割体２３ａ，２３ｂの内径とほぼ等しい寸法にしておく。そして、先ず、セラミックス分割体２３ａ，２３ｂを第１の鋼製環状体２１の外側に配置し、その外側に第２の鋼製環状体２２を加熱しながら嵌める（焼き嵌め）。 The inner ring 1 is an integral body made of steel, and an inner ring raceway groove 1a is formed on the outer peripheral surface. The ball 3 is made of steel.
In this embodiment, the outer ring 2 was produced by the following method.
The inner diameter of the second steel annular body 22 is made 20 to 200 μm smaller than the outer diameter of the ceramic divided bodies 23a and 23b, and the outer diameter of the first steel annular body 21 is set to the inner diameter of the ceramic divided bodies 23a and 23b. Keep the dimensions approximately equal. First, the ceramic divided bodies 23a and 23b are arranged outside the first steel annular body 21, and the second steel annular body 22 is fitted to the outside while heating (shrink fitting).

これにより、第２の鋼製環状体２２からの押圧力がセラミックス分割体２３ａ，２３ｂに作用して、セラミックス分割体２３ａ，２３ｂが第１の鋼製環状体２１に押されるため、両鋼製環状体２１，２２の間に二つのセラミックス分割体２３ａ，２３ｂが挟まれた状態で一体化される。その際に、二つのセラミックス分割体２３ａ，２３ｂは、間に隙間があるため、割れにくい。この隙間にゴムなどの詰め物を入れてもよい。 Thereby, the pressing force from the second steel annular body 22 acts on the ceramic divided bodies 23a, 23b, and the ceramic divided bodies 23a, 23b are pushed by the first steel annular body 21, so that both steel The two ceramic divided bodies 23a and 23b are integrated with each other between the annular bodies 21 and 22. At that time, the two ceramic divided bodies 23a and 23b are difficult to break because there is a gap between them. You may put stuffing, such as rubber | gum, in this clearance gap.

このように、第１の鋼製環状体２１と第２の鋼製環状体２２とセラミックス分割体２３ａ，２３ｂが一体化された状態で、第１の鋼製環状体２１の内周面に外輪軌道溝２１ａを形成し、外周面を仕上げ加工する。
この実施形態の転がり軸受によれば、内輪１と玉３は鋼製であるが、外輪２が鋼製環状体２１，２２とセラミックス分割体２３ａ，２３ｂとからなるため、電食防止性能を有する。また、ハウジングおよび軸との嵌め合い部、すなわち、外輪２の外周面および内輪１の内周面が鋼製の面であるため、損傷が生じにくい。また、玉３が鋼製であるため、面圧が高い用途でも割れが生じにくい。 Thus, the outer ring is formed on the inner peripheral surface of the first steel annular body 21 in a state where the first steel annular body 21, the second steel annular body 22, and the ceramic divided bodies 23a and 23b are integrated. The raceway groove 21a is formed and the outer peripheral surface is finished.
According to the rolling bearing of this embodiment, the inner ring 1 and the ball 3 are made of steel, but the outer ring 2 is made of the steel annular bodies 21 and 22 and the ceramic divided bodies 23a and 23b. . Further, since the fitting portion between the housing and the shaft, that is, the outer peripheral surface of the outer ring 2 and the inner peripheral surface of the inner ring 1 are steel surfaces, damage is unlikely to occur. Further, since the balls 3 are made of steel, cracks are hardly generated even in applications where the surface pressure is high.

この実施形態では、両鋼製環状体２１，２２の間に二つのセラミックス分割体２３ａ，２３ｂを配置したが、両鋼製環状体２１，２２の間に配置するセラミックス体２３は三つ以上のセラミックス分割体からなるものとしてもよい。
また、図５に示すように、第１の鋼製環状体２１の外周面の幅方向（軸方向）一端部と第２の鋼製環状体２２の内周面の幅方向他端部に、それぞれ凸部２１ｂ，２２ｂを設けて、セラミックス体２３をこれに対応させた形状にしてもよい。 In this embodiment, the two ceramic divided bodies 23a and 23b are arranged between the two steel annular bodies 21 and 22. However, the ceramic bodies 23 arranged between the two steel annular bodies 21 and 22 are three or more. It may be made of a ceramic divided body.
Also, as shown in FIG. 5, the width direction (axial direction) one end portion of the outer peripheral surface of the first steel annular body 21 and the width direction other end portion of the inner peripheral surface of the second steel annular body 22 are The convex portions 21b and 22b may be provided, respectively, and the ceramic body 23 may have a shape corresponding thereto.

また、図６に示すように、軌道輪４の外周側に配置される鋼製環状体４１の内周線を多角形とし、内周側に配置される鋼製環状体４２の外周線を、鋼製環状体４１の内周線に対応させた多角形としてもよい。図６では正八角形としており、各辺の位置に１個ずつセラミックス分割体４３ａ〜４３ｈを配置している。
また、図７に示すように、外輪軌道溝２１ａが形成された第１の鋼製環状体２１と、外周側に配置される第２の鋼製環状体２２の間に、セラミックス層（セラミックス体）２０３と接着剤層またはゴム層２０４を配置してもよい。セラミックス層２０３は、第２の鋼製環状体２２の内周面に形成されている。この外輪２は、第２の鋼製環状体２２の内周面に溶射法によりセラミックス層２０３を形成した後、第１の鋼製環状体２１と第２の鋼製環状体２２を接着剤で固定するか、ゴムの弾性力で一体化することで得られる。 Further, as shown in FIG. 6, the inner circumferential line of the steel annular body 41 disposed on the outer peripheral side of the race ring 4 is a polygon, and the outer circumferential line of the steel annular body 42 disposed on the inner peripheral side is It is good also as the polygon made to respond | correspond to the internal peripheral line of the steel annular body 41. FIG. In FIG. 6, it is a regular octagon, and one ceramic divided body 43a to 43h is arranged at each side position.
Further, as shown in FIG. 7, a ceramic layer (ceramic body) is provided between the first steel annular body 21 in which the outer ring raceway groove 21a is formed and the second steel annular body 22 arranged on the outer peripheral side. 203) and an adhesive layer or rubber layer 204 may be disposed. The ceramic layer 203 is formed on the inner peripheral surface of the second steel annular body 22. The outer ring 2 is formed by forming a ceramic layer 203 on the inner peripheral surface of the second steel annular body 22 by a thermal spraying method, and then bonding the first steel annular body 21 and the second steel annular body 22 with an adhesive. It can be obtained by fixing or integrating with the elastic force of rubber.

また、図８に示すように、第２の鋼製環状体２２の内周面に溶射法によりセラミックス層（セラミックス体）２０３を形成し、第１の鋼製環状体２１の外周面にＮｉ−Ｃｒ合金層２０５を形成した後、第１の鋼製環状体２１と第２の鋼製環状体２２を接着剤で固定するか、ゴムの弾性力で一体化することで、外輪２を形成してもよい。
また、図５〜８の構成は内輪の場合も同様に適用できる。 Further, as shown in FIG. 8, a ceramic layer (ceramic body) 203 is formed on the inner peripheral surface of the second steel annular body 22 by a thermal spraying method, and Ni— is formed on the outer peripheral surface of the first steel annular body 21. After forming the Cr alloy layer 205, the outer ring 2 is formed by fixing the first steel annular body 21 and the second steel annular body 22 with an adhesive or by integrating them with the elastic force of rubber. May be.
Moreover, the structure of FIGS. 5-8 is applicable similarly in the case of an inner ring.

本発明の第１実施形態に相当する転がり軸受を示す断面図である。It is sectional drawing which shows the rolling bearing corresponded to 1st Embodiment of this invention. 図１のＡ−Ａ断面図である。It is AA sectional drawing of FIG. 本発明の第２実施形態に相当する転がり軸受を示す断面図である。It is sectional drawing which shows the rolling bearing corresponded to 2nd Embodiment of this invention. 図２のＢ−Ｂ断面図である。It is BB sectional drawing of FIG. 図２のＢ−Ｂ断面図であって、第１の鋼製環状体と第２の鋼製環状体の断面形状が図４とは異なる例を示す。It is BB sectional drawing of FIG. 2, Comprising: The cross-sectional shape of a 1st steel annular body and a 2nd steel annular body differs from FIG. 外周側の鋼製環状体の内周面と内周側の鋼製環状体の外周面が正八角形である例を示す図である。It is a figure which shows the example whose inner peripheral surface of the steel annular body of an outer peripheral side and the outer peripheral surface of the steel annular body of an inner peripheral side are regular octagons. 図２のＢ−Ｂ断面図に対応する図であって、第１の鋼製環状体と第２の鋼製環状体との間の構造が図４とは異なる例を示す。It is a figure corresponding to the BB sectional view of Drawing 2, Comprising: The structure between the 1st steel annular body and the 2nd steel annular body shows an example different from Drawing 4. 図２のＢ−Ｂ断面図に対応する図であって、第１の鋼製環状体と第２の鋼製環状体との間の構造が図４とは異なる例を示す。It is a figure corresponding to the BB sectional view of Drawing 2, Comprising: The structure between the 1st steel annular body and the 2nd steel annular body shows an example different from Drawing 4.

Explanation of symbols

１内輪
１ａ内輪軌道溝
１１第１の鋼製環状体
１１ａ内輪軌道溝
１２第２の鋼製環状体
１３セラミックス体
１３ａ，１３ｂセラミックス分割体
２外輪
２ａ外輪軌道溝
２１第１の鋼製環状体
２１ａ外輪軌道溝
２２第２の鋼製環状体
２３セラミックス体
２３ａ，２３ｂセラミックス分割体
３玉（転動体）
４軌道輪
４１外周側の鋼製環状体
４２内周側の鋼製環状体
４３ａ〜４３ｈセラミックス分割体 DESCRIPTION OF SYMBOLS 1 Inner ring 1a Inner ring raceway groove 11 First steel annular body 11a Inner ring raceway groove 12 Second steel annular body 13 Ceramic body 13a, 13b Ceramic division body 2 Outer ring 2a Outer ring raceway groove 21 First steel annular body 21a Outer ring raceway groove 22 Second steel annular body 23 Ceramic body 23a, 23b Ceramic divided body 3 Ball (rolling element)
4 bearing ring 41 steel annular body on the outer peripheral side 42 steel annular body on the inner peripheral side 43a to 43h ceramic divided body

Claims

The rolling elements are made of metal,
One or both of the inner ring and the outer ring are configured by a first steel annular body and a second steel annular body divided in the thickness direction, and a ceramic body disposed between the both steel annular bodies. Rolling bearings.

The rolling bearing according to claim 1, wherein the ceramic body is composed of two or more ceramic divided bodies divided in the circumferential direction.