JP2007198433A - Four-point contact ball bearing - Google Patents

Four-point contact ball bearing Download PDF

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Publication number
JP2007198433A
JP2007198433A JP2006015252A JP2006015252A JP2007198433A JP 2007198433 A JP2007198433 A JP 2007198433A JP 2006015252 A JP2006015252 A JP 2006015252A JP 2006015252 A JP2006015252 A JP 2006015252A JP 2007198433 A JP2007198433 A JP 2007198433A
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Prior art keywords
ball bearing
point contact
contact ball
grease
extreme pressure
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JP2006015252A
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Inventor
Takashi Iwata
孝 岩田
Yoshitaka Nakagawa
義崇 中川
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JTEKT Corp
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JTEKT Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
    • F16C19/16—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with a single row of balls
    • F16C19/163—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with a single row of balls with angular contact
    • F16C19/166—Four-point-contact ball bearings
    • 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
    • F16C33/66—Special parts or details in view of lubrication
    • F16C33/6603—Special parts or details in view of lubrication with grease as lubricant
    • F16C33/6633—Grease properties or compositions, e.g. rheological 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 four-point contact ball bearing capable of enhancing a seizure life. <P>SOLUTION: Grease is sealed between an inner ring 1 and an outer ring 2. The grease contains an ether base oil, a thickening agent comprising a urea compound, and an extreme pressure additive. The seizure life can be prolonged by a synergic effect (action) of the ether base oil, the thickening agent comprising the urea compound, and the extreme pressure additive. <P>COPYRIGHT: (C)2007,JPO&amp;INPIT

Description

本発明は、例えば自動車エアコンの電磁クラッチなどに使用される４点接触玉軸受に関する。   The present invention relates to a four-point contact ball bearing used, for example, in an electromagnetic clutch of an automobile air conditioner.

自動車エアコンの電磁クラッチでは、複列斜接玉軸受を使用しているが、軽量・コンパクト・低コストを達成するために、複列斜接玉軸受から単列の４点接触玉軸受に変更する場合がある。   In the electromagnetic clutch of automobile air conditioner, double row oblique contact ball bearings are used, but in order to achieve light weight, compactness and low cost, the double row oblique contact ball bearings are changed to single row 4 point contact ball bearings. There is a case.

従来、自動車エアコンに使用される電磁クラッチ用４点接触玉軸受としては、鉱油とリチウム石けんからなるグリースを内部に封入したものがある。   Conventionally, as a four-point contact ball bearing for an electromagnetic clutch used in an automobile air conditioner, there is one in which grease made of mineral oil and lithium soap is enclosed.

ところで、上記従来の４点接触玉軸受では、ラジアル荷重とモーメント荷重が同時に負荷されるため、軌道面に４点で接触しているボールのすべりが大きい。しかし、上記鉱油とリチウム石けんからなるグリースではすべりによる悪影響を防止できない。すなわち、軌道輪・ボールの多点接触により発熱が増大し、短時間で焼付きが発生するという問題がある。   By the way, in the conventional four-point contact ball bearing, since the radial load and the moment load are simultaneously applied, the slip of the ball in contact with the raceway surface at four points is large. However, the grease composed of the above mineral oil and lithium soap cannot prevent adverse effects due to slipping. That is, there is a problem that heat generation increases due to multipoint contact between the race and the ball, and seizure occurs in a short time.

そこで、本発明の課題は、焼付き寿命を向上できる４点接触玉軸受を提供することにある。   Therefore, an object of the present invention is to provide a four-point contact ball bearing that can improve the seizure life.

上記課題を解決するため、請求項１の発明の４点接触玉軸受は、ボールが、内輪の軌道面に２点で接触すると共に、外輪の軌道面に２点で接触する４点接触玉軸受において、上記内輪と上記外輪との間に封入されたグリースが、エーテル系の基油と、ウレア化合物からなる増ちょう剤と、極圧添加剤とを含有することを特徴としている。   In order to solve the above-mentioned problem, the four-point contact ball bearing of the invention of claim 1 is a four-point contact ball bearing in which the ball contacts the raceway surface of the inner ring at two points and contacts the raceway surface of the outer ring at two points. The grease encapsulated between the inner ring and the outer ring contains an ether base oil, a thickener made of a urea compound, and an extreme pressure additive.

上記請求項１の発明の４点接触玉軸受によれば、上記グリースは、エーテル系の基油と、ウレア化合物からなる増ちょう剤と、極圧添加剤とを混合したものである。上記エーテル系の基油は、油膜厚さが比較的厚く、接触応力を緩和する。また、上記ウレア化合物からなる増ちょう剤は、耐熱性、せん断安定性に優れている。そして、上記極圧添加剤は、ボールなどの接触面において接触圧の高い箇所で酸化被膜を形成し、その酸化被膜のクッション効果で接触圧を下げる。したがって、上記エーテル系の基油,ウレア化合物の増ちょう剤,極圧添加剤の相乗作用により、すべり摩擦に起因する発熱を抑え、焼付き寿命を向上させることができる。   According to the four-point contact ball bearing of the first aspect of the invention, the grease is a mixture of an ether base oil, a thickener made of a urea compound, and an extreme pressure additive. The ether base oil has a relatively thick oil film and relieves contact stress. Further, the thickener made of the above urea compound is excellent in heat resistance and shear stability. And the said extreme pressure additive forms an oxide film in a location with high contact pressure in contact surfaces, such as a ball | bowl, and lowers a contact pressure by the cushion effect of the oxide film. Therefore, the synergistic action of the ether base oil, the urea compound thickener, and the extreme pressure additive can suppress heat generation due to sliding friction and improve the seizure life.

一実施形態では、上記ウレア化合物からなる増ちょう剤がグリース全体の０．３〜３０ｗｔ％であり、上記極圧添加剤がグリース全体の０．１〜５ｗｔ％である。   In one embodiment, the thickener composed of the urea compound is 0.3 to 30 wt% of the whole grease, and the extreme pressure additive is 0.1 to 5 wt% of the whole grease.

以上より明らかなように、請求項１の発明の４点接触玉軸受によれば、グリースは、エーテル系の基油と、ウレア化合物からなる増ちょう剤と、極圧添加剤とを含有しているから、エーテル系の基油,ウレア化合物の増ちょう剤,極圧添加剤の相乗作用により、すべり摩擦による発熱が抑制され、焼付き寿命を向上させることができる。   As is clear from the above, according to the four-point contact ball bearing of the invention of claim 1, the grease contains an ether base oil, a thickener made of a urea compound, and an extreme pressure additive. Therefore, the synergistic action of the ether base oil, the urea compound thickener, and the extreme pressure additive suppresses heat generation due to sliding friction and improves the seizure life.

以下、本発明の４点接触玉軸受を図示の実施の形態により詳細に説明する。   Hereinafter, the four-point contact ball bearing of the present invention will be described in detail with reference to embodiments shown in the drawings.

図１に、本発明の実施の一形態の４点接触玉軸受の要部断面図を示す。この４点接触玉軸受は、内輪１と、外輪２と、内輪１と外輪２との間に、周方向に所定間隔を隔てて配列された複数のボール３と、このボール３を保持する樹脂製の保持器４とを有している。各ボール３は、内輪１の軌道面１１に対して２点で接触すると共に、外輪２の軌道面１２に対して２点で接触している。また、上記内輪１と外輪２との間の空間の軸方向の両端にはシール部材５,５を設けている。このシール部材５,５の径方向外側の端部は、外輪２の内周面に形成された段部に固定されている。一方、上記シール部材５,５の径方向内側の端部は、内輪１の外周面に形成された周溝に摺接している。   In FIG. 1, the principal part sectional drawing of the 4-point contact ball bearing of one Embodiment of this invention is shown. The four-point contact ball bearing includes an inner ring 1, an outer ring 2, a plurality of balls 3 arranged at predetermined intervals in the circumferential direction between the inner ring 1 and the outer ring 2, and a resin that holds the balls 3. And a cage 4 made of metal. Each ball 3 is in contact with the raceway surface 11 of the inner ring 1 at two points, and is in contact with the raceway surface 12 of the outer ring 2 at two points. Seal members 5 are provided at both axial ends of the space between the inner ring 1 and the outer ring 2. The radially outer ends of the seal members 5 are fixed to a step formed on the inner peripheral surface of the outer ring 2. On the other hand, the radially inner ends of the seal members 5 and 5 are in sliding contact with a circumferential groove formed on the outer circumferential surface of the inner ring 1.

この４点接触玉軸受では、内輪１と外輪２との間の空間に、エーテル系の基油と、ウレア化合物からなる増ちょう剤と、極圧添加剤とを含有するグリースを充填している。このウレア化合物からなる増ちょう剤をグリース全体の例えば０．３〜３０ｗｔ％、極圧添加剤はグリース全体の例えば０．１〜５ｗｔ％に設定する。   In this four-point contact ball bearing, the space between the inner ring 1 and the outer ring 2 is filled with grease containing an ether base oil, a thickener made of a urea compound, and an extreme pressure additive. . The thickener composed of this urea compound is set to, for example, 0.3 to 30 wt% of the entire grease, and the extreme pressure additive is set to, for example, 0.1 to 5 wt% of the entire grease.

上記エーテル系油は、図２のグラフに示すように、ＰＡＯ（ポリαオレフィン）油に比べて最小油膜厚さが厚い。また、図２のグラフに示さないが、エーテル系油は鉱油よりも最小油膜厚さが厚い。したがって、上記エーテル系の基油は油膜が比較的厚く、接触応力を緩和することができて、焼付き寿命を長くすることができる。このようなエーテル系の基油に対して、耐熱性、せん断安定性に優れたウレア化合物からなる増ちょう剤を混合しているから、焼付き寿命をより延長できる。   As shown in the graph of FIG. 2, the ether oil has a minimum oil film thickness that is larger than that of PAO (poly α-olefin) oil. Although not shown in the graph of FIG. 2, ether oil has a minimum oil film thickness greater than that of mineral oil. Therefore, the ether base oil has a relatively thick oil film, can relieve contact stress, and can increase the seizure life. Since a thickener made of a urea compound having excellent heat resistance and shear stability is mixed with such an ether base oil, the seizure life can be further extended.

表１に、グリース寿命の試験結果を示している。

Figure 2007198433
＊寿命試験所条件：９０００ｒ/ｍｉｎ×１６０℃ Table 1 shows the grease life test results.
Figure 2007198433
 * Life test laboratory conditions: 9000 r / min × 160 ° C.

表１からも判るように、基油としてエーテル系合成油を用い、かつ、増ちょう剤としてウレア化合物を用いたグリースＡは、グリースＢ,グリースＣに比べて、グリース寿命が著しく向上している。つまり、焼付き寿命が著しく向上している。   As can be seen from Table 1, grease A, which uses an ether-based synthetic oil as the base oil and a urea compound as the thickener, has a significantly improved grease life compared to grease B and grease C. . That is, the seizure life is remarkably improved.

そして、上記グリースは極圧添加剤を含有している。この極圧添加剤は、内輪１,外輪２,ボール３および保持器４の接触面において接触圧の高い箇所で酸化被膜を形成し、その酸化被膜のクッション効果で接触圧を下げることができる。したがって、上記グリースは、エーテル系の基油と、ウレア化合物からなる増ちょう剤と、極圧添加剤とを含有しているから、エーテル系の基油,ウレア化合物の増ちょう剤,極圧添加剤の相乗作用により、すべり摩擦に起因する発熱を抑え、焼付き寿命を向上させることができる。   The grease contains an extreme pressure additive. This extreme pressure additive can form an oxide film on the contact surface of the inner ring 1, the outer ring 2, the ball 3, and the cage 4 at a location where the contact pressure is high, and the contact pressure can be lowered by the cushioning effect of the oxide film. Therefore, the above grease contains an ether base oil, a thickener composed of a urea compound, and an extreme pressure additive. Therefore, an ether base oil, a urea compound thickener, and an extreme pressure additive are added. Due to the synergistic action of the agent, heat generation due to sliding friction can be suppressed and the seizure life can be improved.

上記エーテル系の基油としては、ポリエチレングリコール、ポリプロピレングリコール、ポリエチレングリコールモノエーテル、ポリプロピレングリコールモノエーテルなどのポリグリコール、あるいはモノアルキルトリフェニルエーテル、アルキルジフェニルエーテル、ジアルキルジフェニルエーテル、ペンタフェニルエーテル、テトラフェニルエーテル、モノアルキルテトラフェニルエーテル、ジアルキルテトラフェニルエーテルなどのフェニルエーテルなどが挙げられる。   Examples of the ether base oil include polyethylene glycol, polypropylene glycol, polyethylene glycol monoether, polyglycol such as polypropylene glycol monoether, or monoalkyl triphenyl ether, alkyl diphenyl ether, dialkyl diphenyl ether, pentaphenyl ether, tetraphenyl ether, Examples thereof include phenyl ethers such as monoalkyl tetraphenyl ether and dialkyl tetraphenyl ether.

上記ウレア化合物としては、ゲル構造を形成し、基油をゲル構造中に保持する能力があれば、特に制約はなく、例えばジウレアやポリウレア等を適宜選択して使用できる。これらウレア化合物はそれ自身耐熱性を備えるために、グリースの耐熱性向上に寄与する。   The urea compound is not particularly limited as long as it has the ability to form a gel structure and retain the base oil in the gel structure. For example, diurea or polyurea can be appropriately selected and used. Since these urea compounds themselves have heat resistance, they contribute to improving the heat resistance of grease.

上記極圧添加剤としては、塩素系、イオウ系、リン系、ジチオリン酸亜鉛、有機モリブデンなどが挙げられる。   Examples of the extreme pressure additive include chlorine, sulfur, phosphorus, zinc dithiophosphate, and organic molybdenum.

図１は本発明の実施の一形態の４点接触玉軸受の要部断面図である。FIG. 1 is a sectional view of an essential part of a four-point contact ball bearing according to an embodiment of the present invention. 図２は軸受温度と最小油膜厚さとの関係を示すグラフである。FIG. 2 is a graph showing the relationship between the bearing temperature and the minimum oil film thickness.

符号の説明Explanation of symbols

１ 内輪
２ 外輪
３ ボール
１１,１２ 軌道面 1 Inner ring 2 Outer ring 3 Balls 11, 12 Raceway surface

Claims (2)

ボールが、内輪の軌道面に２点で接触すると共に、外輪の軌道面に２点で接触する４点接触玉軸受において、
上記内輪と上記外輪との間に封入されたグリースが、エーテル系の基油と、ウレア化合物からなる増ちょう剤と、極圧添加剤とを含有することを特徴とする４点接触玉軸受。 In the four-point contact ball bearing in which the ball contacts the raceway surface of the inner ring at two points and contacts the raceway surface of the outer ring at two points.
4. A four-point contact ball bearing, wherein the grease sealed between the inner ring and the outer ring contains an ether base oil, a thickener made of a urea compound, and an extreme pressure additive. 請求項１に記載の４点接触玉軸受において、
上記ウレア化合物からなる増ちょう剤が上記グリース全体の０．３〜３０ｗｔ％であり、上記極圧添加剤が上記グリース全体の０．１〜５ｗｔ％であることを特徴とする４点接触玉軸受。 The four-point contact ball bearing according to claim 1,
A four-point contact ball bearing characterized in that the thickener comprising the urea compound is 0.3 to 30 wt% of the whole grease and the extreme pressure additive is 0.1 to 5 wt% of the whole grease. .
JP2006015252A 2006-01-24 2006-01-24 Four-point contact ball bearing Pending JP2007198433A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011509527A (en) * 2008-01-11 2011-03-24 ケイドン コーポレイション Pivot arm assembly for semiconductor wafer handling robot and manufacturing method thereof
WO2011093376A1 (en) * 2010-01-28 2011-08-04 Ntn株式会社 Member for rolling bearing and rolling bearing

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003021149A (en) * 2001-07-11 2003-01-24 Nsk Ltd Rotary support device for pulley for compressor
JP2003161326A (en) * 1992-08-05 2003-06-06 Koyo Seiko Co Ltd Grease for rolling bearing for high temperature, high- speed rotation, and high load, and grease-sealed rolling bearing for high temperature, high-speed rotation, and high load

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003161326A (en) * 1992-08-05 2003-06-06 Koyo Seiko Co Ltd Grease for rolling bearing for high temperature, high- speed rotation, and high load, and grease-sealed rolling bearing for high temperature, high-speed rotation, and high load
JP2003021149A (en) * 2001-07-11 2003-01-24 Nsk Ltd Rotary support device for pulley for compressor

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011509527A (en) * 2008-01-11 2011-03-24 ケイドン コーポレイション Pivot arm assembly for semiconductor wafer handling robot and manufacturing method thereof
WO2011093376A1 (en) * 2010-01-28 2011-08-04 Ntn株式会社 Member for rolling bearing and rolling bearing
CN102725549A (en) * 2010-01-28 2012-10-10 Ntn株式会社 Member for rolling bearing and rolling bearing
EP2530341A1 (en) * 2010-01-28 2012-12-05 NTN Corporation Member for rolling bearing and rolling bearing
EP2530341A4 (en) * 2010-01-28 2015-04-22 Ntn Toyo Bearing Co Ltd Member for rolling bearing and rolling bearing

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