JP5819384B2 - 自動車用変速機油組成物 - Google Patents
自動車用変速機油組成物 Download PDFInfo
- Publication number
- JP5819384B2 JP5819384B2 JP2013230586A JP2013230586A JP5819384B2 JP 5819384 B2 JP5819384 B2 JP 5819384B2 JP 2013230586 A JP2013230586 A JP 2013230586A JP 2013230586 A JP2013230586 A JP 2013230586A JP 5819384 B2 JP5819384 B2 JP 5819384B2
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- Prior art keywords
- acid
- branched
- linear
- oil
- ester
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- 230000005540 biological transmission Effects 0.000 title claims description 43
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- HEBKCHPVOIAQTA-QWWZWVQMSA-N D-arabinitol Chemical compound OC[C@@H](O)C(O)[C@H](O)CO HEBKCHPVOIAQTA-QWWZWVQMSA-N 0.000 description 2
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Description
<エステル系合成油>
本発明の自動車用変速機油組成物(以下、単に潤滑油組成物という場合がある。)は、所定量のエステル系合成油を含有する所定性状の潤滑油基油を備えている。以下、該エステル系合成油について説明する。
(a)一価アルコールと一塩基酸とのエステル
(b)多価アルコールと一塩基酸とのエステル
(c)一価アルコールと多塩基酸とのエステル
(d)多価アルコールと多塩基酸とのエステル
(e)一価アルコールおよび多価アルコールの混合物と、多塩基酸との混合エステル
(f)多価アルコールと、一塩基酸および多塩基酸の混合物との混合エステル
(g)一価アルコールおよび多価アルコールの混合物と、一塩基酸および多塩基酸の混合物との混合エステル
本発明の潤滑油組成物が含有することのできるエステル系合成油以外の基油としては、鉱油または合成油のいずれであってもよく、あるいはこれらの2種以上の混合物であってもよい。
本発明に用いられる潤滑油基油の40℃動粘度は、15mm2/s未満であることが必要であり、好ましくは14mm2/s以下、より好ましくは13mm2/s以下、さらに好ましくは12mm2/s以下である。一方、40℃動粘度は5mm2/s以上であることが好ましく、6mm2/s以上であることがより好ましく、8mm2/s以上であることがさらに好ましい。40℃動粘度が大きすぎる場合には、低温粘度特性が悪化し、また十分な冷却性能が得られないおそれがある。また、逆に、小さすぎる場合は潤滑箇所での油膜形成が不十分であるため潤滑性に劣り、また潤滑油基油の蒸発損失が大きくなるおそれがある。
また、本発明の潤滑油組成物は、冷却性、低温流動性および絶縁性を損なわない限りにおいて、必要に応じて各種添加剤を含有することができる。かかる添加剤としては、特に制限されず、潤滑油の分野で従来使用される任意の添加剤を配合することができる。かかる添加剤としては、具体的には、金属系清浄剤、無灰分散剤、酸化防止剤、極圧剤、摩耗防止剤、摩擦調整剤、粘度指数向上剤、流動点降下剤、腐食防止剤、防錆剤、抗乳化剤、金属不活性化剤、消泡剤などが挙げられる。これらの添加剤は、1種を単独で用いてもよく、また、2種以上を組み合わせて用いてもよい。
なお、本発明の潤滑油組成物の40℃における動粘度に特に制限はないが、上限値として、好ましくは30mm2/s以下、より好ましくは25mm2/s以下、さらに好ましくは20mm2/s以下、特に好ましくは15mm2/s以下である。また、下限値として好ましくは5mm2/s以上、より好ましくは8mm2/s以上、特に好ましくは10mm2/s以上である。40℃における動粘度が小さすぎる場合には、潤滑部位の油膜保持性および蒸発性に問題を生ずるおそれがあり、40℃における動粘度が大きすぎる場合には冷却性の不足をもたらすおそれがある。
表1に示すように、本発明の潤滑油組成物(実施例1〜3)、比較用の潤滑油組成物(比較例1〜3)をそれぞれ調製した。得られた組成物について、熱伝達係数を測定し、その結果を同じく表1に併記した。添加剤は摩耗防止剤、摩擦調整剤、酸化防止剤等を含有する変速機油用添加剤パッケージを一律3質量%添加した。なお、比較例4では、市販のATF(新日本石油社製)を用いた。
エステル基油1:モノエステル(i−C8アルコールとオレイン酸とのエステル)
エステル基油2:ジエステル(i−C8アルコールとC9ジカルボン酸とのエステル)
エステル基油3:ネオペンチルグリコールエステル(ネオペンチルグリコールとi‐C8カルボン酸とのエステル)
鉱油系基油1:水素化分解鉱油(40℃動粘度:9.3mm2/s、粘度指数:111)
鉱油系基油2:溶剤精製鉱油(40℃動粘度:95.0mm2/s、粘度指数:97)
鉱油系基油3:溶剤精製鉱油(40℃動粘度:480.9mm2/s、粘度指数:97)
図1の装置を使用し、ヒーター熱量(250W)、冷却水流量(1000ml/min)および撹拌速度(300rpm)を一定とし、試料油温度が平衡に達したときの潤滑油と冷却水間の熱伝達係数を下式により求めた。
h=q/A(Th−Tc)
ここで、h:熱伝達係数、q:移動熱量、Th:潤滑油温度、Tc:冷却水温度、A:熱交換面積、である。
Claims (2)
- 一価アルコールと一塩基酸とのモノエステル、及び、一価アルコールと二塩基酸とのジエステルからなる群から選ばれる1種または2種以上の混合物であるエステル系合成油を、基油全量基準で10質量%〜100質量%含有し、40℃における動粘度5mm2/s以上15mm2/s未満、100℃における動粘度1mm2/s以上6.5mm2/s以下、粘度指数120以上、15℃における密度0.85g/cm3以上、80℃における誘電率2.5以上30以下、80℃における体積抵抗率0.01×1012Ω・cm以上である潤滑油基油を備えてなり、
40℃における動粘度が5mm2/s以上30mm2/s以下であり、
100℃における動粘度が1.5mm2/s以上7.0mm2/s以下であり、
ハイブリッド車に用いられる、又は、電気自動車もしくはハイブリッド車における変速機と電動モーターとの兼用油である、自動車用変速機油組成物。 - 金属系清浄剤、無灰分散剤、酸化防止剤、極圧剤、摩耗防止剤、摩擦調整剤、粘度指数向上剤、流動点降下剤、腐食防止剤、防錆剤、抗乳化剤、金属不活性化剤、及び消泡剤からなる群から選ばれる1種以上の添加剤を1〜20質量%含有する、
請求項1に記載の自動車用変速機油組成物。
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