JP4199109B2 - ボールジョイント用潤滑剤組成物及びボールジョイント - Google Patents
ボールジョイント用潤滑剤組成物及びボールジョイント Download PDFInfo
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Description
これらの組成物は、常温領域ではボールジョイントに必要な優れた低摩擦性能を有しているが、高温領域や低温領域では摩擦の上昇が生じる。
ところで、近年の自動車技術の進歩により、エンジンルーム内の温度上昇が顕著になっており、ボールジョイント用潤滑剤においても高温領域における低摩擦性が要求されている。一方、ボールジョイント用潤滑剤が寒冷地において使用されるケースも多くなっており、このような場合には、低温領域における低摩擦性も要求される。
R1-NH-R2-N2 (1)
(式中、R1は炭素数1〜24の炭化水素基、R2は炭素数2〜4のアルキレン基を示す。)
また本発明によれば、金属製ボールスタッドと、合成樹脂製シートとを備え、上記組成物が封入されたボールジョイントが提供される。
本発明の組成物における基油は、合成炭化水素油である。
合成炭化水素油としては、例えば、ポリオレフィン油、アルキルベンゼン油、アルキルナフタレン油、ビフェニル油、ジフェニルアルカン油、ジ(アルキルフェニル)アルカン油が挙げられる。これらの中でもポリオレフィン油が好ましく用いられる。
ポリオレフィン油としては、任意のものが使用できるが、中でも炭素数2〜12のオレフィンを1種又は2種以上重合させたものが好ましい。また、エチレン、プロピレン、1-ブテン、2-ブテン、イソブテン、又は炭素数5〜12の直鎖状末端オレフィン(以下、α-オレフィンと呼ぶ)を1種又は2種以上重合させたものがより好ましい。
これらの中でも、エチレンとプロピレンとの共重合体;エチレンと炭素数5〜12のα-オレフィンとの共重合体;ポリブテン、ポリイソブテン又は、炭素数5〜12のα-オレフィンの重合体が好ましく、エチレンと炭素数5〜12のα-オレフィンの共重合体、炭素数5〜12のα-オレフィンの重合体がより好ましい。
本発明の組成物に用いる基油としては、上記オレフィンの重合体を水素化処理したものであっても良い。
上記合成炭化水素油は、1種を単独で使用しても良いし、2種以上の異なる合成炭化水素油を混合して使用しても良い。
本発明の組成物において基油の含有割合は特に制限はないが、低温時の摩擦特性の点からその下限値は、組成物全量基準で10重量%であり、20重量%がより好ましく、40重量%が更に好ましい。また摩擦特性の点からその上限値は、組成物全量基準で87重量%であり、70重量%がより好ましく、60重量%が更に好ましい。
ウレア系増ちょう剤としては、例えば、ウレア化合物、ウレア・ウレタン化合物、ウレタン化合物又はこれらの混合物が挙げられる。
式(2)中、R3は2価の炭化水素基を示し、A及びBは同一でも異なっていてもよく、それぞれ-NHR4、-NR5R6又は-OR7を示す。ここで、R4〜R7は同一でも異なっていてもよく、それぞれ炭素数6〜20の炭化水素残基を示す。
式(1)において、R1は炭素数1〜24の炭化水素基を示す。これらの中でも、炭素数12〜18のアルキル基、炭素数12〜18のアルケニル基、炭素数12〜18のアルカジエニル基等が好ましい。また、R1は、牛脂脂肪酸の炭化水素残基のような天然油脂由来の残基であっても良い。
式(1)において、R2は炭素数2〜4のアルキレン基を示すが、これらの中でも入手性の点からエチレン基が好ましい。
前記脂肪酸塩は、式(1)で表される化合物と脂肪酸とを任意の混合比で反応させることにより得られる。その混合比は任意であるが、式(1)で表される化合物1モルに対して、脂肪酸2モルが好ましい。
固体潤滑剤としては、例えば、黒鉛、フッ化黒鉛、ポリテトラフロロエチレン、二硫化モリブデン、硫化アンチモン、アルカリ金属ほう酸塩、アルカリ土類金属ほう酸塩等が挙げられる。
極圧剤としては、例えば、ジアルキルジチオリン酸亜鉛、ジアリールジチオリン酸亜鉛等の有機亜鉛化合物;ホスフェート、ホスファイト類が挙げられる。
酸化防止剤としては、例えば、2,6-ジ-t-ブチルフェノール、2,6-ジ-t-ブチル-p-クレゾール等のフェノール系化合物;ジアルキルジフェニルアミン、フェニル-α-ナフチルアミン、p-アルキルフェニル-α-ナフチルアミン等のアミン系化合物;硫黄系化合物;フェノチアジン系化合物が挙げられる。
さび止め剤としては、例えば、金属石けん類;ソルビタン脂肪酸エステル等の多価アルコール部分エステル類;アミン類;リン酸;リン酸塩が挙げられる。
粘度指数向上剤としては、例えば、ポリメタクリレート、ポリイソブチレン、ポリスチレンが挙げられる。
ワックス類としては、例えば、天然ワックス、鉱油系ないしは合成系の各種ワックスが例示でき、具体的にはモンタンワックス、カルナウバワックス、高級脂肪酸のアミド化合物、パラフィンワックス、マイクロクリスタリンワックス、ポリオレフィンワックス、エステルワックスが挙げられる。
本発明のボールジョイントは、金属製ボールスタッドと合成樹脂製シートとを備え、上述の本発明の潤滑油組成物が封入されたボールジョイントであり、その構造は、例えば、自動車のステアリング、サスペンション機構に使用される公知のボールジョイントの構造等が挙げられ、特に限定されない。
ボールジョイントへの本発明の潤滑油組成物の封入は、公知の方法等により行うことができる。
実施例1〜7及び比較例1〜5
表1に示す組成により、実施例及び比較例の組成物をそれぞれ調製した。尚、調製は、まず、基油と増ちょう剤とを加熱溶融した後、その他の添加剤を加えて溶解させ、ロールミルに通して行った。組成物に用いた各成分を以下に示す。なお、表1において各成分の数値の単位は重量%である。
ポリα-オレフィン油(100℃動粘度:8mm2/s)、
エチレン-α-オレフィンのオリゴマー(100℃動粘度:2000mm2/s)、
鉱油(100℃動粘度:10mm2/s)
増ちょう剤
ウレア系増ちょう剤:ジウレア化合物、
リチウム石鹸:リチウムステアレート
添加剤
デュオミンT-ジオレート:式(1)においてR1が牛脂脂肪酸の炭化水素基、R2がエチレン基である化合物とオレイン酸との塩(モル比1:2)、
ジアミド化合物:エチレンジアミンとオレイン酸とのジアミド化合物
その他の添加剤:以下の添加剤の混合物(含有割合は、全て組成物全量基準)
酸化防止剤1(ヨシノックスBHT(商品名)、吉富ファインケミカル社製)1重量%、酸化防止剤2(IrganoxL101(商品名)、チバ・スペシャルティケミカルズ社製)0.5重量%、さび止め剤(ペレテックスOS100(商品名)、ミヨシ油脂社製)0.45重量%、及び金属不活性化剤(Irgamet(商品名)39、チバ・スペシャルティケミカルズ社製)0.05重量%
摩擦特性試験方法:バウデン試験
摩擦特性の試験装置としては、市販のバウデン摩擦試験機を用いた。図1に概略図を示す。本試験機は、水平方向に往復動する試料台10に摺動部材11を固定し、ホルダーに固定された鋼球12を、図1に示すとおり上部から摺動部材11に圧着できる構成を有する。摺動部材11が固定されている試料台10を矢印Hの水平方向に往復動させ、鋼球12のホルダーに接続したストレインゲージ式荷重検出器13で摩擦力を測定、記録計で記録する。圧着荷重は、分銅14を選択することにより変更が可能であり、試料台10の平均移動速度も無段階に設定可能である。試料の供給方法は、試験前に試料油を摺動部材11に0.5g塗りつける方法を採った。
尚、試験条件は水平移動速度3.6mm/s、荷重4.9Nとし、鋼球12には市販の玉軸受用鋼球5/32インチ精密球を、摺動部材11にはポリアセタール樹脂を用い、摺動初期の摩擦係数を測定した。
高温特性:滴点試験
滴点試験は、JIS K2220 5.4.2に規定する試験機を用い、試験条件は5.4.4に従って行なった。
Claims (5)
- 合成炭化水素油を含む基油を組成物全量基準で10〜87重量%と、増ちょう剤を組成物全量基準で3〜30重量%と、式(1)で表される化合物の脂肪酸塩を組成物全量基準で10〜70重量%とを含むボールジョイント用潤滑剤組成物。
R1-NH-R2-NH2 (1)
(式中、R1は炭素数1〜24の炭化水素基、R2は炭素数2〜4のアルキレン基を示す。) - 合成炭化水素油が、エチレンとプロピレンとの共重合体、エチレンと炭素数5〜12のα-オレフィンとの共重合体、ポリブテン、ポリイソブテン、炭素数5〜12のα-オレフィンの重合体及びこれらの混合物からなる群より選択される請求項1の組成物。
- 増ちょう剤が、石けん系増ちょう剤、ウレア系増ちょう剤及びこれらの混合物からなる群より選択される請求項1の組成物。
- 固体潤滑剤、極圧剤、酸化防止剤、油性剤、さび止め剤、粘度指数向上剤、ワックス類及びこれらの混合物からなる群より選択される添加剤を更に含む請求項1の組成物。
- 金属製ボールスタッドと、合成樹脂製シートとを備え、請求項1の組成物が封入されたボールジョイント。
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JP2001207722 | 2001-07-09 | ||
JP2001207722 | 2001-07-09 | ||
PCT/JP2002/006884 WO2003006590A1 (fr) | 2001-07-09 | 2002-07-08 | Composition lubrifiante pour joint spherique et joint spherique |
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US (3) | US20040198617A1 (ja) |
EP (1) | EP1416036B1 (ja) |
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Cited By (3)
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WO2012086393A1 (ja) | 2010-12-24 | 2012-06-28 | 本田技研工業株式会社 | ボールジョイント |
JP2017149905A (ja) * | 2016-02-26 | 2017-08-31 | 協同油脂株式会社 | ボールジョイント用グリース組成物 |
WO2020136163A1 (en) | 2018-12-27 | 2020-07-02 | Shell Internationale Research Maatschappij B.V. | Lubricant composition for ball joints |
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JP4689888B2 (ja) * | 2001-07-09 | 2011-05-25 | Jx日鉱日石エネルギー株式会社 | ボールジョイント用潤滑剤組成物及びボールジョイント |
JP4566909B2 (ja) * | 2003-03-11 | 2010-10-20 | 日本精工株式会社 | 樹脂潤滑用グリース組成物及び電動パワーステアリング装置 |
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JP4687226B2 (ja) * | 2005-04-28 | 2011-05-25 | 株式会社ジェイテクト | 潤滑グリース組成物を用いた転動装置およびこの転動装置を用いた電動パワーステアリング装置 |
JP4809626B2 (ja) | 2005-04-28 | 2011-11-09 | 昭和シェル石油株式会社 | ウレア系潤滑グリース組成物 |
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- 2002-07-08 JP JP2003512349A patent/JP4199109B2/ja not_active Expired - Lifetime
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WO2012086393A1 (ja) | 2010-12-24 | 2012-06-28 | 本田技研工業株式会社 | ボールジョイント |
JP2017149905A (ja) * | 2016-02-26 | 2017-08-31 | 協同油脂株式会社 | ボールジョイント用グリース組成物 |
US11702613B2 (en) | 2016-02-26 | 2023-07-18 | Kyodo Yushi Co., Ltd. | Grease composition for ball joint |
WO2020136163A1 (en) | 2018-12-27 | 2020-07-02 | Shell Internationale Research Maatschappij B.V. | Lubricant composition for ball joints |
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EP1416036B1 (en) | 2011-08-24 |
US8513173B2 (en) | 2013-08-20 |
WO2003006590A1 (fr) | 2003-01-23 |
US20070265179A1 (en) | 2007-11-15 |
US20110318092A1 (en) | 2011-12-29 |
JPWO2003006590A1 (ja) | 2004-11-04 |
US20040198617A1 (en) | 2004-10-07 |
EP1416036A1 (en) | 2004-05-06 |
EP1416036A4 (en) | 2006-11-08 |
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