JP5038719B2 - 車輪支持用転がり軸受用耐水性グリース組成物及び車輪支持用転がり軸受 - Google Patents
車輪支持用転がり軸受用耐水性グリース組成物及び車輪支持用転がり軸受 Download PDFInfo
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- JP5038719B2 JP5038719B2 JP2006543017A JP2006543017A JP5038719B2 JP 5038719 B2 JP5038719 B2 JP 5038719B2 JP 2006543017 A JP2006543017 A JP 2006543017A JP 2006543017 A JP2006543017 A JP 2006543017A JP 5038719 B2 JP5038719 B2 JP 5038719B2
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- grease
- water
- wheel
- mass
- rolling bearing
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- B60B27/00—Hubs
- B60B27/0094—Hubs one or more of the bearing races are formed by the hub
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- F16C33/6603—Special parts or details in view of lubrication with grease as lubricant
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Description
(1)外周面に軌道面を有する内方部材と、前記内方部材の軌道面に対向する軌道面を内周面に有し前記内方部材の外方に配される外方部材と、前記両軌道面間に転動自在に配設された複数の転動体とを備える車輪支持用転がり軸受に封入されるグリース組成物であって、
鉱油または炭化水素系油からなり、40℃における動粘度が10〜400mm2/sである基油と、ウレア化合物または金属複合石けんからなる増ちょう剤とを含み、耐水性付与剤として下記(A)〜(D)の何れかを添加してなることを特徴とする車輪支持用転がり軸受用耐水性グリース組成物。
(A)陽イオン型界面活性剤、陰イオン型界面活性剤及び両性界面活性剤の少なくとも1種をグリース全量の0.1〜10質量%
(B)非イオン型界面活性剤をグリース全量の0.3〜10質量%及び金属不活性化剤をグリース全量の0.5〜10質量%
(C)金属石けん、フッ素系撥水剤及びシリコーン系撥水剤の少なくとも一種をグリース全量の0.1〜20質量%
(D)pH調整剤を、グリース全量の0.1〜10質量%で、かつ、耐水性グリース組成物のpHを7〜10にする量
(2)外周面に軌道面を有する内方部材と、前記内方部材の軌道面に対向する軌道面を内周面に有し前記内方部材の外方に配される外方部材と、前記両軌道面間に転動自在に配設された複数の転動体とを備え、上記(1)記載の車輪支持用転がり軸受用耐水性グリース組成物を封入してなることを特徴とする車輪支持用転がり軸受。
(3)ハブユニットであることを特徴とする上記(2)記載の車輪支持用転がり軸受。
尚、以降の説明において、耐水性付与剤として(A)または(B)を添加した耐水性グリースを「第1の耐水性グリース」、(C)を添加した耐水性グリースを「第2の耐水性グリース」、(D)を添加した耐水性グリースを「第3の耐水性グリース」と呼ぶ。
2 ハブ
4a,4b 内輪軌道
5 段部
6 雄ネジ部
7 ナット
8 外輪
10a,10b 外輪軌道
11 転動体
12 保持器
13 シールリング
第1の耐水性グリース組成物は、上記ベースグリースに、耐水性付与剤として界面活性剤を添加したものである。界面活性剤としては、陰イオン型界面活性剤、陽イオン型界面活性剤、両性界面活性剤及び非イオン型界面活性剤の何れも使用できるが、界面活性剤の種類によりその添加量が異なる。界面活性剤の存在により、侵入した水分を20μm程度の微細な水滴としてグリース中に均一に分散させることができ、潤滑部位において油膜を良好に維持して潤滑性能を長期にわたり安定して維持できるようになるが、非イオン界面活性は水分を取り込む能力が十分ではなく、微細な水滴としてグリース中に取り込むことができない。そのため、添加量を調整する必要がある。
第2の耐水性グリース組成物は、上記ベースグリースに、耐水性付与剤として金属石けん、フッ素系撥水剤及びシリコーン系撥水剤の少なくとも1種を添加したものである。ワックスまたはポリマーによりグリース組成物の付着性が向上し、水分が混入した場合でも潤滑部位からの流出が抑えられ、潤滑膜を良好な状態で長期にわたり維持できる。金属石けんとしては、ステアリン酸アルミニウム、ステアリン酸カルシウム、ステアリン酸亜鉛、ステアリン酸マグネシウム等が挙げられ、特にステアリン酸カルシウムが好ましい。フッ素系撥水剤としては、ポリテトラフルオロエチレン樹脂、パーフルオロポリエーテル油等が挙げられる。シリコーン系撥水剤としては、ジメチルシリコーン油等が挙げられる。
第3の耐水性グリース組成物は、上記ベースグリースに、耐水性付与剤としてpH調整剤を添加してpHを7〜10に調整したものである。グリース組成物をこのようなpHとすることで、混入した水分から水素イオンが発生するのを抑え、剥離を防止することができる。pH調整剤は、グリースをこのようなpHとすることができれば制限されるものではないが、スルホネート、フェネート、ホスホネート、コハク酸イミド等を好適に使用することができ、目的とするpHとなるように適宜選択する。
車輪支持用転がり軸受の種類やそれ自体の構造には制限がなく、例えば図1にしたハブユニットを例示でき、上記本発明の耐水性グリース組成物を封入すればよい。グリースの封入量としては、制限されるものではないが、内輪素子1、外輪8及び転動体11で形成される内部空間の30〜50体積%が適当である。封入量が30体積%未満であると潤滑不足により耐久性が不十分となるおそれがあり、50体積%超であるとグリース組成物の漏洩が生じるおそれがある。
ジイソシアネートを混合した鉱物油に、アミンを混合した鉱物油を加えて反応させ、攪拌加熱してウレア系ベースグリースを調製した。徐冷後、表1に示ように界面活性剤を添加(添加量は何れもグリース全量の1質量%)し、攪拌、脱泡処理を行ない試験グリースを得た。尚、試験グリースのちょう度はNLGI No.1〜3に調整した。そして、各試験グリースについて、下記に示す含水シェルロール試験を行った。
試験グリースを50gとイオン交換水10gとをシェルロール試験機に入れ、回転数165rpm、温度40℃の条件で2時間含水シェルロール試験を行った。その際、光学顕微鏡によりグリース中の水の粒径を測定を行なった。結果を表1に併記する。また、グリース中の水の状態を撮影した写真を図2〜図6に示す。
日本精工(株)製円すいころ軸受「HR32017(内径85mm、外径130mm、幅29mm)」に試験グリースを封入し、ラジアル荷重35.8kN、アキシアル荷重15.7kN、回転速度1500rpmにて、外部から水を軸受内に1質量%/secの割合で封入し、100時間連続回転させた。回転終了後、軸受を分解して剥離の発生の有無を確認した。結果を表2に併記する。
表3に示す配合にて試験グリースを調製した。尚、何れの試験グリースにも、酸化防止剤としてフェニルナフチルアミン(Vanderbit社製「Vanlube 81」)及び防錆剤としてナフテン酸亜鉛(日本化学産業(株)製「ナフチックス亜鉛」)を、それぞれグリース全量の1.0質量%となるように添加してある。そして、各試験グリースについて、下記に示す軸受耐水性試験を行った。
日本精工(株)製円すいころ軸受「HR32017(内径85mm、外径130mm、幅29mm)」に試験グリースを封入し、ラジアル荷重35.8kN、アキシアル荷重15.7kN、回転速度1500rpmにて、外部から水を軸受内に1質量%/secの割合で封入し、100時間連続回転させた。回転終了後、軸受を分解して剥離の発生の有無を確認した。また、試験グリース中の水分量及びちょう度を測定した。結果を表3に併記する。
ジイソシアネートを混合した鉱物油に、アミンを混合した鉱物油を加えて反応させ、攪拌加熱してウレア系ベースグリースを調製した。徐冷後、種々のpH調整剤を添加し、攪拌、脱泡処理を行なってpH2、pH4、pH6、pH7、pH8、pH9、pH10の試験グリースを得た。尚、何れの試験グリースにおいても、pH調整剤の添加量はグリース全量の1質量%とした。また、何れの試験グリースも、混和ちょう度はNLGI No.1〜3に調整した。そして、各試験グリースについて、下記に示す軸受耐水性試験を行った。
日本精工(株)製円すいころ軸受「HR32017(内径85mm、外径130mm、幅29mm)」に各試験グリースを封入し、ラジアル荷重35.8kN、アキシアル荷重15.7kN、回転速度1500rpmにて、外部から水を軸受内に20mL/hの割合で導入しながら連続回転させた。回転は100時間を目処とし、それまでの間に試験軸受が振動したときを剥離発生とみなし、回転を停止した。また、回転後100時間経過した時点で振動が発生しない場合を剥離発生無しとみなし、回転を停止した。試験は各試験グリースについて10回ずつ行ない、下記式より剥離発生確率を求めた。
剥離発生確率(%)=(剥離発生数/試験数)×100
Claims (3)
- 外周面に軌道面を有する内方部材と、前記内方部材の軌道面に対向する軌道面を内周面に有し前記内方部材の外方に配される外方部材と、前記両軌道面間に転動自在に配設された複数の転動体とを備える車輪支持用転がり軸受に封入されるグリース組成物であって、
鉱油または炭化水素系油からなり、40℃における動粘度が10〜400mm2/sである基油と、ウレア化合物または金属複合石けんからなる増ちょう剤とを含み、耐水性付与剤として下記(A)〜(D)の何れかを添加してなることを特徴とする車輪支持用転がり軸受用耐水性グリース組成物。
(A)陽イオン型界面活性剤、陰イオン型界面活性剤及び両性界面活性剤の少なくとも1種をグリース全量の0.1〜10質量%
(B)非イオン型界面活性剤をグリース全量の0.3〜10質量%及び金属不活性化剤をグリース全量の0.5〜10質量%
(C)金属石けん、フッ素系撥水剤及びシリコーン系撥水剤の少なくとも一種をグリース全量の0.1〜20質量%
(D)pH調整剤を、グリース全量の0.1〜10質量%で、かつ、耐水性グリース組成物のpHを7〜10にする量 - 外周面に軌道面を有する内方部材と、前記内方部材の軌道面に対向する軌道面を内周面に有し前記内方部材の外方に配される外方部材と、前記両軌道面間に転動自在に配設された複数の転動体とを備え、請求項1記載の車輪支持用転がり軸受用耐水性グリース組成物を封入してなることを特徴とする車輪支持用転がり軸受。
- ハブユニットであることを特徴とする請求項2記載の車輪支持用転がり軸受。
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PCT/JP2005/019143 WO2006043566A1 (ja) | 2004-10-18 | 2005-10-18 | 耐水性グリース組成物及び車輪支持用転がり軸受 |
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US8153568B2 (en) | 2005-09-28 | 2012-04-10 | Ntn Corporation | Water-resistant grease and water-resistant-grease-enclosed rolling bearing and hub |
JP5086550B2 (ja) * | 2006-03-17 | 2012-11-28 | Ntn株式会社 | ハブベアリング |
JP5044995B2 (ja) * | 2006-05-30 | 2012-10-10 | 日本精工株式会社 | 自動車用ハブユニット |
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JP4751808B2 (ja) * | 2006-10-31 | 2011-08-17 | Ntn株式会社 | 鉄道車両用軸受 |
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JP5189273B2 (ja) * | 2006-11-08 | 2013-04-24 | Ntn株式会社 | 一方向クラッチ |
JP5392595B2 (ja) | 2008-04-08 | 2014-01-22 | Ntn株式会社 | グリース封入外輪回転用転がり軸受 |
US8596878B2 (en) | 2008-12-01 | 2013-12-03 | Aktiebolaget Skf | Rolling bearing and thrust bearing assembly comprising said rolling bearing |
JP5604061B2 (ja) * | 2009-06-22 | 2014-10-08 | 出光興産株式会社 | グリース組成物 |
JP5593677B2 (ja) * | 2009-10-29 | 2014-09-24 | 日本精工株式会社 | 鉄道車軸軸受用グリース組成物及び鉄道車軸支持用転がり軸受 |
WO2011118814A1 (ja) * | 2010-03-26 | 2011-09-29 | 出光興産株式会社 | グリース組成物 |
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JP5737004B2 (ja) * | 2011-06-27 | 2015-06-17 | トヨタ自動車株式会社 | プランジャ用潤滑剤およびその製造方法 |
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JP2018090783A (ja) * | 2016-11-30 | 2018-06-14 | ミネベアミツミ株式会社 | グリース組成物および転がり軸受 |
WO2018101432A1 (ja) * | 2016-11-30 | 2018-06-07 | ミネベアミツミ株式会社 | グリース組成物および転がり軸受 |
JP6804156B2 (ja) * | 2017-03-29 | 2020-12-23 | 日本製鉄株式会社 | ころがり軸受用グリース組成物 |
CN107557125B (zh) * | 2017-09-26 | 2020-07-21 | 中国石油化工股份有限公司 | 一种全氟聚醚型导电润滑脂及其制备方法 |
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-
2005
- 2005-10-18 EP EP05795825A patent/EP1806391A1/en not_active Withdrawn
- 2005-10-18 JP JP2006543017A patent/JP5038719B2/ja active Active
- 2005-10-18 US US11/665,533 patent/US20080219610A1/en not_active Abandoned
- 2005-10-18 WO PCT/JP2005/019143 patent/WO2006043566A1/ja active Application Filing
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WO2006043566A1 (ja) | 2006-04-27 |
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JPWO2006043566A1 (ja) | 2008-05-22 |
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