JP2992731B2 - Automotive alternator - Google Patents
Automotive alternatorInfo
- Publication number
- JP2992731B2 JP2992731B2 JP5286662A JP28666293A JP2992731B2 JP 2992731 B2 JP2992731 B2 JP 2992731B2 JP 5286662 A JP5286662 A JP 5286662A JP 28666293 A JP28666293 A JP 28666293A JP 2992731 B2 JP2992731 B2 JP 2992731B2
- Authority
- JP
- Japan
- Prior art keywords
- outer ring
- bearing
- alternator
- steel
- rotating shaft
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- 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
- F16C33/303—Parts of ball or roller bearings of hybrid bearings, e.g. rolling bearings with steel races and ceramic rolling elements
-
- 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
- F16C19/02—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
- F16C2380/00—Electrical apparatus
- F16C2380/26—Dynamo-electric machines or combinations therewith, e.g. electro-motors and generators
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Ceramic Engineering (AREA)
- Motor Or Generator Frames (AREA)
- Rolling Contact Bearings (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、自動車用オルタネータ
（交流発電機）に係り、特にその内部で熱影響を受けや
すい回転軸支持用の転がり軸受を改良したものに関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alternator (alternating current generator) for a motor vehicle, and more particularly to an improved rolling bearing for supporting a rotating shaft which is easily affected by heat inside the alternator.
【０００２】[0002]
【従来の技術】従来、自動車用オルタネータに用いる回
転軸支持用の転がり軸受としては、特殊なものを採用し
ておらず、軸受構成要素の各素材は一般的な軸受鋼や浸
炭鋼などとされている。2. Description of the Related Art Conventionally, rolling bearings for supporting a rotating shaft used in an alternator for an automobile have not adopted special ones, and each material of the bearing components is generally made of bearing steel or carburized steel. ing.
【０００３】[0003]
【発明が解決しようとする課題】ところで、自動車用の
オルタネータでは、通常の運転に伴って回転軸に取り付
けられてあるロータと、ケースに取り付けられてあるス
テータとで構成するモータの特にステータコイルが発熱
するので、この熱はケースから回転軸支持用の転がり軸
受や回転軸へと伝導されるようになっている。By the way, in an alternator for a motor vehicle, particularly a stator coil of a motor composed of a rotor attached to a rotating shaft and a stator attached to a case in a normal operation is used. Since heat is generated, this heat is conducted from the case to the rolling bearing for supporting the rotating shaft and the rotating shaft.
【０００４】これらの熱は、ケースの外表面やケースか
ら外部へ突出する回転軸から適宜放熱される他、プーリ
に設けられた冷却ファンにより冷却されるのであるが、
高速・高荷重回転に伴う転動体による発熱により回転軸
支持用の転がり軸受全体の温度が内・外輪の素材である
一般的な鋼の焼き戻し温度（約１７０〜２００℃）より
も高くなるような場合がある。その場合には、回転軸支
持用の転がり軸受の内・外輪の軌道面直下の組成が変化
して硬度が著しく低下するとともに鋼の残留オーステナ
イトがマルテンサイト化するマルテンサイト変態によっ
て寸法の肥大化を伴い軸受すきまの増大をもたらす結果
となる。特にオルタネータでは、それが取り付けられる
エンジンの振動や衝撃を直接受けるために、前述のよう
に転がり軸受の内・外輪の硬度が低下することに伴って
転動体軌道に圧痕が発生しやすくなる。特に固定側とな
る外輪では負荷圏が一定であるため、振動・衝撃の影響
が大きく軌道面直下に多数の微細クラックや組織変化
（白層の生成）を生じ、軌道面が荒れる。荒れた軌道面
により高速・高荷重下ではさらに発熱の要因となり上記
現象が助長される。結果的にごく短時間のうちに剥離を
生じるなど、早期に軸受寿命に至るおそれがある。[0004] These heats are appropriately radiated from the outer surface of the case and the rotating shaft protruding from the case to the outside, and are cooled by a cooling fan provided on the pulley.
The temperature of the entire rolling bearing for supporting the rotating shaft becomes higher than the tempering temperature (approximately 170 to 200 ° C.) of the general steel used for the inner and outer rings due to the heat generated by the rolling elements accompanying the high-speed and high-load rotation. It may be. In this case, the composition immediately below the raceway surfaces of the inner and outer races of the rolling bearing for supporting the rotating shaft changes and the hardness decreases significantly, and at the same time, the size increases due to martensite transformation in which the retained austenite of the steel turns into martensite. This results in an increase in bearing clearance. In particular, since the alternator is directly subjected to the vibration or impact of the engine to which the alternator is attached, the hardness of the inner and outer races of the rolling bearing is reduced as described above, so that indentations are easily generated on the rolling element raceway. In particular, since the load zone is constant on the outer ring on the fixed side, the influence of vibration and impact is large, and a large number of fine cracks and structural changes (generation of white layer) occur immediately below the raceway surface, and the raceway surface becomes rough. The rough track surface causes heat generation under high speed and high load, which further promotes the above phenomenon. As a result, the bearing may be depleted within a very short time, leading to an early end of the bearing life.
【０００５】このような場合、内・外輪を耐熱性を有す
るセラミックスで形成して機能劣化を抑制すればよいと
考えられるが、大幅なコストアップを余儀なくされるな
ど、無駄が多いと言える。しかも、セラミックスの場合
には、金属製のケースに対する線膨張係数の差が大きく
なるために、温度上昇時にはめ合い隙間がかなり大きく
なって回転軸の支持状態が不安定になることが懸念され
る。In such a case, it is considered that the deterioration of the function may be suppressed by forming the inner and outer rings with ceramics having heat resistance, but it can be said that there is much waste such as a significant increase in cost. In addition, in the case of ceramics, the difference in linear expansion coefficient with respect to the metal case becomes large, so that when the temperature rises, the fitting gap becomes considerably large, and there is a concern that the support state of the rotating shaft becomes unstable. .
【０００６】一方、特開平４−２４４６２４号公報にみ
られるように、転動体をファインセラミックスにするこ
とにより、鋼の水素脆性による剥離発生を抑制したもの
があるが、単に転動体をセラミックスにするだけでは、
オルタネータなどに使用される小径軸受では外輪温度上
昇の抑制効果は少なく、軌道面の剥離発生を充分に抑制
できない。On the other hand, as disclosed in Japanese Patent Application Laid-Open No. 4-244624, there is a type in which the rolling element is made of fine ceramics to prevent the occurrence of peeling due to hydrogen embrittlement of steel. Alone
In a small-diameter bearing used for an alternator or the like, the effect of suppressing the rise in the outer ring temperature is small, and the occurrence of peeling of the raceway surface cannot be sufficiently suppressed.
【０００７】本発明はこのような事情に鑑み、回転軸支
持用の転がり軸受の昇温に伴う機能劣化を防止しなが
ら、それに関するコストアップを必要最小限に抑えるこ
とを課題としている。SUMMARY OF THE INVENTION In view of such circumstances, it is an object of the present invention to prevent a deterioration in function of a rolling bearing for supporting a rotating shaft due to a rise in temperature, and to minimize a cost increase associated with the deterioration.
【０００８】[0008]
【課題を解決するための手段】本発明は、回転軸をケー
スに回転自在に支持する転がり軸受を有する自動車用オ
ルタネータであって、前記転がり軸受の転動体が窒化け
い素を主体とするセラミックスで形成されているととも
に、内・外輪が鋼材で形成され、そのうち少なくとも外
輪が２００〜３８０℃の焼き戻し温度の熱処理が施され
て残留オーステナイトを９．８％以下で表面硬さをＨＲ
Ｃ５６．０〜６０．５とした鋼材で形成されている。SUMMARY OF THE INVENTION The present invention is an alternator for an automobile having a rolling bearing for rotatably supporting a rotating shaft on a case, wherein the rolling element of the rolling bearing is made of ceramics mainly composed of silicon nitride. together are formed, the inner and outer rings are formed of steel, it is subjected a heat treatment of tempering temperature of which at least the outer ring is two hundred to three hundred eighty ° C.
HR at 9.8% or less of retained austenite
It is formed of a steel material with C56.0 to 60.5 .
【０００９】[0009]
【作用】オルタネータの発熱に伴い、ケースから回転軸
支持用の転がり軸受の外輪へ熱伝導されても、外輪が焼
戻し温度を通常より高い２００〜３８０℃に設定して残
留オーステナイトを９．８％以下で表面硬さをＨＲＣ５
６．０〜６０．５とした鋼よりなるので、熱的に安定と
なり、鋼のマルテンサイト変態に伴う寸法の肥大化が抑
制され当初の適正な軸受すきまを維持することが可能と
なる。従って、特に固定側となる外輪が振動や衝撃を受
けても軸受すきまが適正であるため軌道面での振動や衝
撃による影響が軽微であり、ミクロ的な塑性変形に伴う
局部的な組織変化やクラックの発生を抑止することがで
きる。[Function] Even if heat is conducted from the case to the outer ring of the rolling bearing for supporting the rotating shaft due to the heat generated by the alternator, the tempering temperature of the outer ring is set to 200 to 380 ° C., which is higher than usual, and the temperature remains.
HRC5 with surface hardness of less than 9.8% retained austenite
Since the steel is made 6.0 to 60.5, it is thermally stable, and the enlargement of the dimensions due to the martensitic transformation of the steel is suppressed, so that it is possible to maintain the initial appropriate bearing clearance. Therefore, even if the outer ring on the fixed side receives vibration or impact, the bearing clearance is appropriate, so the influence of vibration or impact on the raceway surface is negligible, and local structural changes due to microscopic plastic deformation and The occurrence of cracks can be suppressed.
【００１０】そして、転動体をセラミックスにすること
により、鋼に比べ外輪に対する遠心力の影響を少なくす
ることができるとともに、外輪の接触楕円も小さくでき
るので、さらに軌道面での振動や衝撃による影響を小さ
くすることができる。ミクロ的なすべり領域も少なくな
り高速・高荷重回転に伴う軸受の熱発生が抑えられると
ともに凝着現象も発生せず、軌道面でのミクロ的な塑性
変化を抑制できる。また、熱伝導率も小さいことから、
転動体周囲のグリースの昇温を抑制できグリース寿命を
適性化することができる。[0010] By using ceramic rolling elements, the effect of centrifugal force on the outer ring can be reduced as compared with steel, and the contact ellipse of the outer ring can be reduced. Can be reduced. The microscopic slip region is reduced, the heat generation of the bearing due to the high-speed and high-load rotation is suppressed, the adhesion phenomenon does not occur, and the microscopic plastic change on the raceway surface can be suppressed. Also, since the thermal conductivity is small,
The temperature rise of the grease around the rolling elements can be suppressed, and the grease life can be optimized.
【００１１】なお、外輪とケースはいずれも鋼材であっ
て線膨張係数がほとんど同じであるため、はめ合い部分
で不都合が発生しない。Since the outer race and the case are both made of steel and have almost the same linear expansion coefficient, no inconvenience occurs at the fitting portion.
【００１２】[0012]
【実施例】図１および図２に本発明の一実施例を示して
いる。図１にオルタネータの縦断面図を示しており、１
はフロントブラケット１ａとリアブラケット１ｂをボル
ト結合してなるケース、２はケース１に二つの転がり軸
受３，３を介して回転自在に支持された回転軸である。
ケース１にはコイル６が巻回されたステータ５が、ま
た、回転軸２にはコイル８が巻回されたロータ７、ポー
ル９、ファン一体型のプーリ１０およびスリップリング
１１がそれぞれ取り付けられている。なお、スリップリ
ング１１にはブラシ１２がばねによって圧接させられて
いる。1 and 2 show an embodiment of the present invention. FIG. 1 shows a vertical sectional view of the alternator.
Is a case formed by bolting the front bracket 1a and the rear bracket 1b, and 2 is a rotating shaft rotatably supported on the case 1 via two rolling bearings 3, 3.
A stator 5 around which a coil 6 is wound is attached to the case 1, and a rotor 7 around which a coil 8 is wound, a pole 9, a pulley 10 integrated with a fan, and a slip ring 11 are attached to the rotating shaft 2. I have. A brush 12 is pressed against the slip ring 11 by a spring.
【００１３】この回転軸２の支持用の二つの転がり軸受
３，３は、例えば深溝型玉軸受などとされるが、特に限
定されない。ところで、この転がり軸受３において、転
動体３ｃは窒化けい素を主体とするセラミックスで、外
輪３ａはＳＡＥ５１２０材に浸炭処理を施した後、−７
５℃でサブゼロ処理を施し、焼き戻し温度が運転時のス
テータコイル（熱源）６の温度（１５０〜２００℃）よ
りも高め例えば２７０℃に設定された浸炭鋼で、内輪３
ｂは一般的な軸受鋼（ＳＵＪ−２など、但し焼戻し温度
１８５℃）で、それぞれ形成されている。なお、３ｄは
保持器で６６ナイロンや４６ナイロンなどのポリアミド
樹脂やＰＥＳ（ポリエーテルスルホン）樹脂でなる。こ
のような合成樹脂で形成することにより、セラミックス
製転動体３ｃと相まって熱の伝達を遮断し、軸受内のグ
リースの発熱を防止し軸受寿命を延長する。３ｅはシー
ルである。The two rolling bearings 3 for supporting the rotary shaft 2 are, for example, deep groove ball bearings, but are not particularly limited. By the way, in this rolling bearing 3, the rolling element 3c is a ceramic mainly composed of silicon nitride, and the outer ring 3a is obtained by subjecting the SAE5120 material to carburizing treatment to -7
Subzero treatment is performed at 5 ° C., and the tempering temperature is higher than the temperature (150 to 200 ° C.) of the stator coil (heat source) 6 during operation (for example, 270 ° C.).
b is a common bearing steel (such as SUJ-2, but with a tempering temperature of 185 ° C.), each of which is formed. 3d is a cage made of polyamide resin such as 66 nylon or 46 nylon or PES (polyether sulfone) resin. By being formed of such a synthetic resin, the transmission of heat is cut off in combination with the ceramic rolling elements 3c, the heat generation of the grease in the bearing is prevented, and the life of the bearing is extended. 3e is a seal.
【００１４】なお、外輪３ａの表面の浸炭深さは０．３
〜０．７ｍｍで、表面硬さはＨＲＣ５６．０〜６０．５
となっており、内部の硬さはＨＲＣ３５．０〜５２．０
とされ、残留オーステナイト量は３％以下とされてい
る。内部の硬さが表面に比べ軟らかい浸炭鋼であるた
め、内部が振動や衝撃の緩衝部となり軌道面でのそれら
の影響を緩和している。内輪３ｂの表面硬さはＨＲＣ５
８．０〜６２．０とされ、残留オーステナイト量は１１
〜１４％とされている。この実施例を以下において実施
例１とする。The carburized depth of the surface of the outer ring 3a is 0.3
０．７0.7 mm and surface hardness of HRC 56.0-60.5
And the internal hardness is HRC 35.0 to 52.0
The amount of retained austenite is set to 3% or less. Since the inside is made of carburized steel that is softer than the surface, the inside serves as a buffer for vibration and shock, and alleviates the effects on the raceway surface. The surface hardness of the inner ring 3b is HRC5
8.0 to 62.0, and the amount of retained austenite is 11
１４14%. This embodiment is hereinafter referred to as a first embodiment.
【００１５】次にこの他の実施例について説明する。こ
こでは、上記実施例１の外輪３ａを次のものとしてい
る。Next, another embodiment will be described. Here, the outer ring 3a of the first embodiment is as follows.
【００１６】実施例２の外輪３ａでは、ＳＡＥ５１２０
材に浸炭処理を施した後、−１９６℃でサブゼロ処理を
施し、２１０℃で焼戻した浸炭鋼で形成されている。こ
のときの残留オーステナイト量は５．７％であった。In the outer ring 3a of the second embodiment, the SAE 5120
It is made of carburized steel that has been subjected to a carburizing treatment, then subjected to a sub-zero treatment at -196 ° C, and tempered at 210 ° C. At this time, the retained austenite amount was 5.7%.
【００１７】実施例３の外輪３ａでは、ＳＡＥ５１２０
材に浸炭処理を施した後、−６０℃でサブゼロ処理を施
し、２００℃で焼戻した浸炭鋼で形成されている。この
ときの残留オーステナイト量は９．８％であった。In the outer ring 3a of the third embodiment, the SAE 5120
It is made of carburized steel that has been subjected to a carburizing treatment at -60 ° C after a carburizing treatment and then tempered at 200 ° C. At this time, the amount of retained austenite was 9.8%.
【００１８】実施例４の外輪３ａでは、ＳＵＪ−２材に
８４５℃で焼入れ加熱、油冷後、３５０℃で焼戻した軸
受鋼で形成されている。このときの残留オーステナイト
量は３％以下であった。The outer ring 3a of the fourth embodiment is made of bearing steel which is quenched and heated at 845 ° C., oil-cooled, and then tempered at 350 ° C. for SUJ-2 material. At this time, the amount of retained austenite was 3% or less.
【００１９】実施例５の外輪３ａでは、ＳＵＪ−２材に
８４５℃で焼入れ加熱、油冷後、−７０℃でサブゼロ処
理を行った後、２００℃で焼戻した軸受鋼で形成されて
いる。このときの残留オーステナイト量は７．９％であ
った。The outer ring 3a of the fifth embodiment is formed of bearing steel which is obtained by quenching and heating the SUJ-2 material at 845 ° C., oil-cooling, sub-zero treatment at −70 ° C., and then tempering at 200 ° C. At this time, the retained austenite amount was 7.9%.
【００２０】なお、比較例として一般軸受（内・外輪お
よび玉をＳＵＪ−２製、焼き戻し温度１８０℃）を用い
た。As a comparative example, a general bearing (with inner and outer rings and balls made of SUJ-2, tempering temperature of 180 ° C.) was used.
【００２１】上記各実施例および比較例の軸受を組み込
んだ試験機を加振台に設置し、負荷を加えると同時に、
内輪を回転させた状態で振動を加えて振動試験を行っ
た。なお、試験条件は次のとおりである。A test machine incorporating the bearings of the above Examples and Comparative Examples was installed on a vibration table, and a load was applied.
A vibration test was performed by applying vibration while rotating the inner ring. The test conditions are as follows.
【００２２】軸受荷重（静的負荷）／動定格荷重・・・
０．２２ 内輪回転数・・・８０００ｒｐｍ 計算寿命（上記による）・・・１９６時間 振動加速度・・・１０Ｇ（加振台上） 雰囲気温度・・・１７０℃ 試験時間・・・５００時間 そして、剥離までの時間から疲労度を比較評価した。試
験結果を表１に示す。なお、試験の結果、外輪以外には
異常が認められなかったので、結果は外輪についてのみ
示す。Bearing load (static load) / dynamic load rating ...
0.22 Inner ring rotation speed: 8000 rpm Calculated life (according to the above): 196 hours Vibration acceleration: 10 G (on a vibration table) Atmospheric temperature: 170 ° C. Test time: 500 hours And peeling The degree of fatigue was compared and evaluated from the time up to. Table 1 shows the test results. In addition, as a result of the test, no abnormality was recognized except for the outer ring, so the results are shown only for the outer ring.
【００２３】 試料 剥離までの回転時間 比較例 ３３〜１７０時間（ｎ＝１５） 実施例１ ５００時間まで剥離せず（ｎ＝６） 実施例２ ５００時間まで剥離せず（ｎ＝６） 実施例３ ５００時間まで剥離せず（ｎ＝６） 実施例４ ５００時間まで剥離せず（ｎ＝６） 実施例５ ５００時間まで剥離せず（ｎ＝６） なお、比較例では、試験後に外輪軌道面に多数のクラッ
クと組織変化とともに、グリースの劣化が認められた
が、実施例１、２、４では、クラック、組織変化および
グリースの劣化ともに認められず、実施例３、５ではわ
ずかに組織変化が認められただけであった。このよう
に、実施例１〜５の本発明による転がり軸受の寿命が比
較例の転がり軸受に比べて大幅に向上することがわか
る。Sample Rotation time until peeling Comparative Example 33 to 170 hours (n = 15) Example 1 No peeling until 500 hours (n = 6) Example 2 No peeling until 500 hours (n = 6) 3 No peeling up to 500 hours (n = 6) Example 4 No peeling up to 500 hours (n = 6) Example 5 No peeling up to 500 hours (n = 6) Degradation of the grease was observed along with a number of cracks and structural changes on the surface. However, in Examples 1, 2, and 4, neither cracks, structural changes nor deterioration of the grease were recognized. Only a change was noted. Thus, it can be seen that the life of the rolling bearings according to the present invention of Examples 1 to 5 is greatly improved as compared with the rolling bearing of the comparative example.
【００２４】比較例は、前述の試験において振動を与え
ない場合には、１５００時間後でも剥離を生じることが
なく、また、クラックや組織変化が認められず、通常の
使用条件であれば何ら問題ないことも確認されている。In the comparative example, when no vibration was applied in the above-mentioned test, no peeling occurred even after 1500 hours, and no crack or structural change was observed. It has been confirmed that there is no such thing.
【００２５】また、上記実施例では、外輪３ａに特殊な
熱処理を施しているが、外輪３ａに限らず内輪３ｂに適
用してもよい。Further, in the above-described embodiment, a special heat treatment is applied to the outer ring 3a. However, the present invention is not limited to the outer ring 3a but may be applied to the inner ring 3b.
【００２６】[0026]
【発明の効果】以上説明したように、本発明では、外輪
を熱的に安定で寸法肥大化が抑制される素材とする一方
で転動体を熱的影響を受けずに内・外輪間の熱伝導を遮
断して外輪に対する回転遠心力の影響が少なくなるとと
もに凝着現象を生じない素材としているから、オルタネ
ータが発熱したときでも外輪軌道面での過度の発熱が抑
えられ軸受隙間が適正に維持される他、振動や衝撃を受
けても外輪の軌道面で影響が軽微で済むなど、局部的な
組織変化やクラックの発生を抑止できるようになる。ま
た、転動体周囲のグリースの昇温が抑制されることにな
るので、グリース寿命を適正化できるようになる。しか
も、外輪とケースはいずれも鋼材であって線膨張係数が
ほとんど同じであるため、はめ合い部分で不都合が発生
しない。As described above, according to the present invention, the outer ring is made of a material that is thermally stable and the dimensional enlargement is suppressed, while the rolling elements are not thermally affected by the heat between the inner and outer rings. The material that blocks the conduction and reduces the effect of the rotational centrifugal force on the outer ring and does not cause the adhesion phenomenon. In addition, even if it receives vibration or shock, the influence on the raceway surface of the outer ring is negligible, so that it is possible to suppress local structural changes and cracks. Further, since the temperature rise of the grease around the rolling elements is suppressed, the grease life can be optimized. In addition, since the outer race and the case are both made of steel and have substantially the same linear expansion coefficient, no problem occurs at the fitting portion.
【００２７】したがって、本発明によれば、回転軸支持
用の転がり軸受の昇温に伴う機能劣化を防止しながら、
それに関するコストアップを必要最小限に抑えることが
できるようになる。Therefore, according to the present invention, it is possible to prevent deterioration of the function of the rolling bearing for supporting the rotating shaft due to temperature rise,
The cost increase relating to this can be minimized.
【図１】本発明の自動車用オルタネータの一実施例の縦
断面図。FIG. 1 is a longitudinal sectional view of an embodiment of an automotive alternator according to the present invention.
【図２】本実施例での転がり軸受を示す上半分の縦断面
図。FIG. 2 is a longitudinal sectional view of an upper half showing a rolling bearing according to the embodiment.
１ ケース ２ 回転軸 ３ 転がり軸受 ３ａ 外輪 ３ｂ 内輪 ３ｃ 転動体 DESCRIPTION OF SYMBOLS 1 Case 2 Rotating shaft 3 Rolling bearing 3a Outer ring 3b Inner ring 3c Rolling element
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) F16C 33/62 F16C 33/32 ──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. 6 , DB name) F16C 33/62 F16C 33/32
Claims (1)
がり軸受を有する自動車用オルタネータであって、 前記転がり軸受の転動体が窒化けい素を主体とするセラ
ミックスで形成されているとともに、内・外輪が鋼材で
形成され、そのうち少なくとも外輪が２００〜３８０℃
の焼き戻し温度の熱処理が施されて残留オーステナイト
を９．８％以下で表面硬さをＨＲＣ５６．０〜６０．５
とした鋼材で形成されている、ことを特徴とする自動車
用オルタネータ。1. An alternator for an automobile having a rolling bearing rotatably supporting a rotating shaft on a case, wherein a rolling element of the rolling bearing is formed of ceramics mainly composed of silicon nitride. Outer ring is made of steel
It is formed, of which at least the outer ring is 200 to 380 ° C.
Heat treatment at the tempering temperature of retained austenite
Is 9.8% or less and the surface hardness is HRC 56.0 to 60.5.
An alternator for an automobile, wherein the alternator is made of a steel material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5286662A JP2992731B2 (en) | 1993-11-16 | 1993-11-16 | Automotive alternator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5286662A JP2992731B2 (en) | 1993-11-16 | 1993-11-16 | Automotive alternator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07139550A JPH07139550A (en) | 1995-05-30 |
| JP2992731B2 true JP2992731B2 (en) | 1999-12-20 |
Family
ID=17707334
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5286662A Expired - Lifetime JP2992731B2 (en) | 1993-11-16 | 1993-11-16 | Automotive alternator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2992731B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009299713A (en) * | 2008-06-10 | 2009-12-24 | Ntn Corp | Roller bearing for alternator, and alternator |
Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19757027B4 (en) * | 1997-12-20 | 2004-11-04 | Fag Kugelfischer Ag | Ball bearings for high speeds |
| JP2000297860A (en) | 1999-02-12 | 2000-10-24 | Nsk Ltd | Roller clutch-included type pulley device for alternator |
| JP2000240461A (en) | 1999-02-23 | 2000-09-05 | Nsk Ltd | One-way clutch built-in type pulley device for alternator and method for preventing creak of alternator driving endless belt |
| EP1067303B1 (en) | 1999-07-09 | 2008-12-31 | Nsk Ltd | Alternator pulley unit with a built-in one-way clutch |
| JP4529214B2 (en) * | 2000-01-20 | 2010-08-25 | 株式会社ジェイテクト | Thrust roller bearing |
| JP3681954B2 (en) | 2000-05-09 | 2005-08-10 | 三菱電機株式会社 | One-way clutch built-in type rotation transmission device |
| JP2003083426A (en) | 2001-09-11 | 2003-03-19 | Nsk Ltd | Roller clutch incorporated type pulley device and assembling method therefor |
| JP2003090414A (en) | 2001-09-17 | 2003-03-28 | Nsk Ltd | Pulley device with built-in roller clutch and assembly method thereof |
| JP2008095841A (en) * | 2006-10-12 | 2008-04-24 | Ntn Corp | Alternator bearing |
| JP2008095912A (en) * | 2006-10-16 | 2008-04-24 | Ntn Corp | Alternator bearing |
| JP2008309505A (en) * | 2007-06-12 | 2008-12-25 | Ntn Corp | Bearing testing device and bearing test method |
| JP5208009B2 (en) * | 2009-02-06 | 2013-06-12 | Ｎｔｎ株式会社 | Plunger pump bearing |
| EP2642145A4 (en) * | 2010-11-16 | 2015-10-21 | Ntn Toyo Bearing Co Ltd | Rolling element bearing, and method for producing rolling element bearing |
| JP2012107676A (en) * | 2010-11-16 | 2012-06-07 | Ntn Corp | Rolling bearing and method for manufacturing rolling bearing |
| JP2012107675A (en) * | 2010-11-16 | 2012-06-07 | Ntn Corp | Rolling bearing and method for manufacturing rolling bearing |
| JP6368271B2 (en) * | 2015-04-06 | 2018-08-01 | Ntn株式会社 | Manufacturing method of rolling bearing |
| JP6308971B2 (en) * | 2015-04-06 | 2018-04-11 | Ntn株式会社 | Rolling bearing and manufacturing method of rolling bearing |
| US20220403881A1 (en) * | 2021-06-22 | 2022-12-22 | Transportation Ip Holdings, Llc | Ceramic bearing assembly |
-
1993
- 1993-11-16 JP JP5286662A patent/JP2992731B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009299713A (en) * | 2008-06-10 | 2009-12-24 | Ntn Corp | Roller bearing for alternator, and alternator |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07139550A (en) | 1995-05-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2992731B2 (en) | Automotive alternator | |
| US6488789B2 (en) | Wheel bearing unit | |
| JP3487288B2 (en) | Rolling bearing with surface treatment and method of manufacturing the same | |
| JP2000337389A (en) | Rolling bearing | |
| JP2002021858A (en) | Wheel axle bearing device | |
| JP2011094785A (en) | Rolling bearing | |
| JP4174699B2 (en) | AC generator for vehicles | |
| JP4127009B2 (en) | Rolling bearing unit | |
| US5385412A (en) | Rolling bearing | |
| JP6368271B2 (en) | Manufacturing method of rolling bearing | |
| JPH0772565B2 (en) | Vehicle alternator | |
| JP3548918B2 (en) | Rolling bearing | |
| JP2007155021A (en) | Roller bearing | |
| JP2000104742A (en) | Rolling bearing for supporting ball screw | |
| JP2004301149A (en) | Ball bearing | |
| GB2068479A (en) | Electrical machine | |
| JPH06330761A (en) | Roller bearing for supporting impeller shaft of supercharger | |
| JPH10159579A (en) | Rolling bearing for engine auxiliary machine | |
| JP3968932B2 (en) | Bearings for engine accessories | |
| JP2002242942A (en) | Rolling bearing | |
| JPH09317773A (en) | Roller bearing | |
| JP2002339989A (en) | Ball bearing | |
| JP5263863B2 (en) | Automotive electrical equipment and auxiliary equipment | |
| WO2001096756A1 (en) | Rolling bearing | |
| JP2004340219A (en) | Pulley, pulley device with built-in clutch for engine auxiliary machine, and clearance structure between the pulley and the engine auxiliary machine |