JPH04314794A - 自動車のサスペンション用油圧作動油 - Google Patents

自動車のサスペンション用油圧作動油

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Publication number
JPH04314794A
JPH04314794A JP3091399A JP9139991A JPH04314794A JP H04314794 A JPH04314794 A JP H04314794A JP 3091399 A JP3091399 A JP 3091399A JP 9139991 A JP9139991 A JP 9139991A JP H04314794 A JPH04314794 A JP H04314794A
Authority
JP
Japan
Prior art keywords
viscosity
hydraulic
hydraulic fluid
oil
weight
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.)
Pending
Application number
JP3091399A
Other languages
English (en)
Inventor
Koji Takemitsu
竹光 公司
Katsuhiro Akiyama
秋山 健優
Hiroshi Ohashi
大橋 広
Shoichi Ichikawa
市川 彰一
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tonen General Sekiyu KK
Toyota Motor Corp
Original Assignee
Tonen Corp
Toyota Motor Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tonen Corp, Toyota Motor Corp filed Critical Tonen Corp
Publication of JPH04314794A publication Critical patent/JPH04314794A/ja
Pending legal-status Critical Current

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Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。

Description

【発明の詳細な説明】
【0001】
【産業上の利用分野】本発明は、自動車のサスペンショ
ン用油圧作動油に関し、特に、自動車の姿勢制御を液圧
流体を用いて行なう油圧装置に適用され、正確な姿勢制
御を可能とする油圧応答性に優れた自動車のサスペンシ
ョン用油圧作動油に関する。更に詳しくは、本発明は、
オレフィンオリゴマーとジエステルとを含む混合油を基
油成分とする合成潤滑油系の油圧応答性に優れた自動車
のサスペンション用油圧作動油に関する。
【0002】
【従来の技術】自動車車体の支持装置(サスペンション
)として、各車輪の近傍に設けられるスプリングダンパ
ーの代わりに、ハイドロリック・ラムを取付け、プレッ
シャー・アキュムレーター(蓄圧器)からの油圧によっ
て前記ラムを駆動させ、車体の姿勢を安定的に制御しよ
うとするものがある。この種のサスペンション用の油圧
作動油は、自動車の厳しい使用環境から、その基本的特
性として、高温での良好な粘度特性と低温での良好な流
動特性、即ち良好な粘度−温度特性を有することが要求
される。従来、自動車のサスペンション用油圧作動油と
しては、低温流動性に優れた低粘度の鉱油を基油とし、
これに粘度指数向上剤としてポリメタクリレート(PM
A)を多量に配合して所望の粘度−温度特性を付与した
ものが知られている。しかしながら、従来の鉱油系油圧
作動油は、良好な粘度−温度特性を有するものの、その
他の要求特性においては不十分なものである。
【0003】従来の鉱油系油圧作動油では、100℃で
の動粘度が約2センチストークス(cSt;mm2/s
)の鉱油を基油とし、所望の粘度−温度特性を付与する
ため、粘度指数向上剤としてPMAを多量に配合するこ
とにより、100℃での粘度を約6cSt程度に調整し
ている。この油圧作動油は、以下のような問題点を有し
ている。 (1)  通常の自動車用油圧作動油、例えば、ATF
(オートマチック  トランスミッション  フルード
)やPSF(パワー  ステアリング  フルード)な
どの引火点が200℃以上であるのに対し、前記油圧作
動油の引火点は、100〜140℃と非常に低いこと。 (2)  蒸発ロスがATFやPSFではほとんど0%
であるのに対し、前記油圧作動油の蒸発ロスは、15〜
35%にも達すること。 (3)  基油粘度が低いため、焼付防止性が悪いこと
。 (4)  剪断力による油圧作動油の粘度低下が大きく
、剪断安定性が悪いこと 。これは、前記油圧作動油が、ピストンポンプの摺動部
、ショックアブソーバーピストンのノズルなどにおいて
、剪断力により粘度低下をきたすことによるもので、主
としてPMAの剪断安定性が低いことに起因する。この
ように、従来の鉱油系油圧作動油は、自動車のサスペン
ション用油圧作動油に要求される諸特性を満足すること
、特に、油圧応答性を長期にわたり安定的に維持するこ
とが極めて困難である。
【0004】
【発明が解決しようとする課題】本発明の目的は、良好
な粘度−温度特性を有するとともに、耐引火性、耐蒸発
性、焼付防止性、剪断安定性等が改善され、油圧応答性
が長期にわたって維持される自動車のサスペンション用
油圧作動油を提供することにある。本発明者らは、前記
従来技術の有する問題点を克服するために鋭意研究した
結果、オレフィンオリゴマーとジエステルとを特定の割
合で混合した合成潤滑油を基油として用いることにより
、前記目的を達成できることを見出し、その知見に基づ
いて本発明を完成するに至った。
【0005】
【課題を解決するための手段】かくして、本発明によれ
ば、(a)オレフィンオリゴマー70〜90重量%と、
(b)炭素数4〜14の脂肪族二塩基酸と炭素数4〜1
4のアルコールとの縮合により得られるジエステル10
〜30重量%とを含む混合油を基油として含有すること
を特徴とする自動車のサスペンション用油圧作動油が提
供される。また、本発明によれば、前記基油に、リン酸
エステル系摩擦調整剤および粘度指数向上剤を含有せし
めた自動車のサスペンション用油圧作動油が提供される
【0006】以下、本発明について詳述する。本発明の
自動車のサスペンション用油圧作動油は、前記した如く
、従来のスプリングダンパーを用いたサスペンション機
構によるのではなく、油圧を利用して車体の姿勢制御を
行う油圧装置などに供せられるものである。この種の姿
勢制御方式においては、マイクロプロセッサー技術の発
達により、路面情報をセンサーが数1000個/秒、例
えば、3000個/秒の割合で入手し、これに対応させ
て姿勢の制御が行われる。従って、正確な姿勢制御には
、油圧作動油として数1000回/秒の油圧の駆動指示
に対し長期にわたり安定的に応答できるものでなければ
ならない。
【0007】本発明者らの研究によれば、この種の用途
に供せられるサスペンション用油圧作動油は、自動車の
使用環境の条件からして、高温で良好な粘度特性、具体
的には、100℃で、通常、2〜15cSt、好ましく
は4〜10cStの動粘度を有するとともに、良好な低
温粘度特性(低温流動性)、具体的には、−40℃で、
通常、400〜2400ミルパスカルセカンド(mPa
・s)、好ましくは500〜2000mPa・sの粘度
を有することが望ましい。また、油圧作動油の粘度指数
(VI)は、通常、200以上、好ましくは250以上
であることが望ましい。さらに、サスペンション用油圧
作動油の基本特性として、耐引火性、耐蒸発性、焼付防
止性、剪断安定性などが総合的に優れていなければなら
ない。このような諸特性に優れた油圧作動油は、(a)
オレフィンオリゴマー70〜90重量%と、(b)炭素
数4〜14の脂肪族二塩基酸と炭素数4〜14のアルコ
ールとの縮合により得られるジエステル10〜30重量
%とを含む混合油を基油として用いることにより得るこ
とができる。
【0008】(オレフィンオリゴマー)本発明で使用さ
れるオレフィンオリゴマーは、通常、炭素数2〜14、
好ましくは4〜12の範囲の、直鎖状あるいは分枝状の
オレフィン系炭化水素から選択された任意の1種の単独
重合または2種以上の共重合により得られるものである
。オレフィンオリゴマーは、通常、100℃で、1〜1
30cSt、好ましくは1.5〜25cStの動粘度を
有するものである。その平均分子量は、通常、約100
〜約2000、好ましくは約200〜約1000の範囲
である。本発明で使用するオレフィンオリゴマーとして
は、特に、水素添加により不飽和結合を飽和させたもの
が好ましい。
【0009】オレフィンオリゴマーとしては、例えば、
α−オレフィンオリゴマー、エチレン/α−オレフィン
オリゴマー等がある。α−オレフィンオリゴマーとして
は、炭化水素または低級オレフィンの3〜6量体化によ
り得られる炭素数6〜12のα−オレフィンの混合物、
例えば、25〜50重量%のヘキセン−1、30〜40
重量%のオクテン−1および25〜40重量%のデセン
−1からなる混合物を共重合したものを挙げることがで
きる。デセン−1のごとき単独モノマーから得られるオ
リゴマーおよびその水素添加物も好適である。エチレン
/α−オレフィンオリゴマーとしては、例えば、40〜
90重量%のエチレンと10〜60重量%のプロピレン
とをを共重合させたものを挙げることができる。
【0010】これらのオレフィンオリゴマーは、触媒と
して、塩化アルミニウム、フッ化ホウ素等のフリーデル
クラフト型触媒、チーグラー触媒または酸化クロム等の
酸化物触媒等を使用して製造することができる。オレフ
ィンオリゴマーの水素添加は、重合反応生成物から触媒
を除去した後、加温、加圧下において、例えば、ニッケ
ル−モリブデン/アルミナのような水素化触媒の存在下
に、水素と接触させることにより行うことができる。
【0011】(ジエステル)本発明で使用されるジエス
テルは、炭素数4〜14の脂肪族二塩基酸と炭素数4〜
14のアルコールとの脱水縮合によって得られジエステ
ルである。このジエステルは、通常、100℃で2〜7
cStの動粘度を有する。炭素数4〜14の脂肪族二塩
基酸としては、例えば、コハク酸、グルタル酸、アジピ
ン酸、ピペリン酸、スベリン酸、アゼライン酸、セバシ
ン酸、ウンデカン二酸、ドデカン二酸、ブラジリン酸、
およびテトラデカン二酸などを挙げることができる。こ
れらの中でも、アジピン酸、アゼライン酸、およびセバ
シン酸が好ましく、アジピン酸およびセバシン酸が特に
好ましい。
【0012】炭素数4〜14のアルコールとしては、例
えば、n−ブタノール、イソブタノール、n−アルミア
ルコール、イソアミルアルコール、n−ヘキサノール、
2−エチルブタノール、シクロヘキサノール、n−ヘプ
タノール、イソヘプタノール、メチルシクロヘキサノー
ル、n−オクタノール、ジメチルヘキサノール、2−エ
チルヘキサノール、2,4,4−トリメチルペンタノー
ル、イソオクタノール、3,5,5−トリメチルヘキサ
ノール、イソノナノール、イソデカノール、イソウンデ
カノール、2−ブチルオクタノール、トリデカノールお
よびイソテトラデカノールなどを挙げることがでる。こ
れらの中でも、2−エチルヘキサノールおよびイソデカ
ノールが特に好ましい。
【0013】これらの脂肪族二塩基酸と炭素数4〜14
のアルコールから得られるジエステルとしては、例えば
、ジ−(1−エチルプロピル)アジペート、ジ−(3−
メチルブチル)アジペート、ジ−(1,3−メチルブチ
ル)アジペート、ジ−(2−エチルヘキシル)アジペー
ト、ジ−(イソノニル)アジペート、ジ−(イソデシル
)アジペート、ジ−(ウンデシル)アジペート、ジ−(
トリデシル)アジペート、ジ−(イソテトラデシル)ア
ジペート、ジ−(2,2,4−トリメチルペンチル)ア
ジペート、ジ−[混合(2−エチルヘキシル、イソノニ
ル)]アジペート、ジ−(1−エチルプロピル)アゼレ
ート、ジ−(3−メチルブチル)アゼレート、ジ−(2
−エチルブチル)アゼレート、ジ−(2−エチルヘキシ
ル)アゼレート、ジ−(イソオクチル)アゼレート、ジ
−(イソノニル)アゼレート、ジ−(イソデシル)アゼ
レート、ジ−(トリデシル)アゼレート、ジ−[混合(
2−エチルヘキシル、イソノニル)]アゼレート、ジ−
[混合(2−エチルヘキシル,デシル)]アゼレート、
ジ−[混合(2−エチルヘキシル、イソデシル)]アゼ
レート、ジ−[混合(2−エチルヘキシル、2−プロピ
ルヘプチル)]アゼレート、ジ−(n−ブチル)セバケ
ート、ジ−(イソブチル)セバケート、ジ−(1−エチ
ルプロピル)セバケート、ジ−(1,3−メチルブチル
)セバケート、ジ−(2−メチルブチル)セバケート、
ジ−(2−エチルヘキシル)セバケート、ジ−[2−(
2−エチルブトキシ)エチル]セバケート、ジ−(2,
2,4−トリメチルベンジル)セバケート、ジ−(イソ
ノニル)セバケート、ジ−(イソデシル)セバケート、
ジ−(イソウンデシル)セバケート、ジ−(トリデシル
)セバケート、ジ−(イソテトラデシル)セバケート、
ジ−[混合(2−エチルヘキシル,イソノニル)]セバ
ケート、ジ−(2−エチルヘキシル)グルタレート、ジ
−(イソウンデシル)グルタレート、およびジ−(イソ
テトラデシル)グルタレートなどを挙げることができる
【0014】これらのジエステルは、通常、100℃で
、2〜7cSt、好ましくは2.2〜6cStの動粘度
を有するものである。動粘度が低すぎると、耐引火性、
耐揮発性および耐荷重性に問題があり、高すぎると低温
での粘度が大きくなり、低温流動性が損なわれる。
【0015】(基  油)本発明の自動車のサスペンシ
ョン用油圧作動油の基油は、前記オレフィンオリゴマー
とジエステルとの混合油を含むものである。両者の配合
割合は、オレフィンオリゴマー70〜90重量%、好ま
しくは75〜90重量%、さらに好ましくは80〜85
重量%と、ジエステル10〜30重量%、好ましくは1
0〜25重量%、さらに好ましくは15〜20重量%で
ある。この配合割合の混合油を基油として用いることに
より、自動車のサスペンション用油圧作動油としての前
記要求特性を満足させることができる。即ち、良好な粘
度−温度特性を有するとともに、耐引火性、耐蒸発性、
焼付防止性、剪断安定性等が総合的に改善された油圧作
動油を得ることができる。従来の鉱油を基油とする油圧
作動油においては、粘度−温度特性を改良すると、蒸発
性や剪断安定性等が低下するが、本発明の基油を用いる
と、良好な粘度−温度特性を有するとともに、良好な耐
蒸発性や剪断安定性を達成することができる。
【0016】基油中のジエステルの配合割合が大きくな
りすぎると、低温粘度が高くなり、低温流動性が低下す
るとともに、油圧装置を構成するゴム部材を膨潤させや
すくなる。また、オレフィンオリゴマーの配合割合が大
きくなりすぎると、ゴム部材を硬くする傾向が見られる
。なお、本発明で用いる基油には、本発明の目的を損な
わない範囲において、鉱油などの他の潤滑油を配合して
もよい。例えば、本発明の自動車のサスペンション用油
圧作動油は、50重量%未満の配合割合で鉱油系油圧作
動油を混合しても、−40℃における良好な低温粘度特
性が維持される。
【0017】(各種添加剤)本発明においては、オレフ
ィンオリゴマーとジエステルとの混合油を含む基油に対
し、サスペンション用油圧作動油としての特性を向上さ
せるために、各種の添加剤を配合することができる。こ
れら添加剤の中でも、特に重要なものは、リン酸エステ
ル系摩擦調整剤と粘度指数向上剤である。
【0018】リン酸エステル系摩擦調整剤本発明のサス
ペンション用油圧作動油には、摩擦特性や摩耗防止特性
を向上させるために、リン酸エステル、亜リン酸エステ
ルおよびリン酸エステルアミン塩から選ばれる少なくと
も1種の摩擦調整剤を添加することができる。リン酸エ
ステルは、特に初期(なじみ運転時)の摩擦特性と摩耗
防止性を向上させるために使用され、また、亜リン酸エ
ステルは、特になじみ運転後、長期にわたり低い摩擦特
性を確保するために使用される。リン酸エステルアミン
塩は、亜リン酸エステルと同様の性能を有し、亜リン酸
エステルより若干摩擦特性は高いものの、亜リン酸エス
テルよりさらに長期にわたって良好な摩擦特性を確保す
ることができる。
【0019】リン酸エステルおよび亜リン酸エステルと
しては、例えば、下記の一般式で示されるものが挙げら
れる。 O=P(OR1)(OR2)(OR3)、O=P(OH
)(OR1)(OR2)、O=P(OH)2(OR1)
、 P(OR1)(OR2)(OR3)、 P(OH)(OR1)(OR2)、 P(OH)2(OR1)。 (ただし、式中、R1、R2およびR3は、炭素数4以
上の飽和または不飽和のアルキル基、アリール基または
アルキル置換アリール基であり、それぞれ同一または相
異なるものであってもよい。)リン酸エステル系摩擦調
整剤として、より具体的には、例えば、オレイルアシッ
ドフォスフェイト〔(C18H35O)P(OH)2O
と(C18H35O)2P(OH)Oとの混合物〕、ジ
オレイルハイドロゲンホスファイト〔(C18H35O
)2P(OH)〕などが挙げられる。
【0020】リン酸エステルアミン塩は、リン酸エステ
ルまたは亜リン酸エステルとアミン化合物との反応生成
物である。アミン化合物としては、例えば、炭素数10
〜20の飽和または不飽和のアルキル基からなる1級ま
たは2級アミンを挙げることができる。リン酸エステル
アミン塩の具体例としては、ジイソオクチルアシッドフ
ォスフェイトアミン塩〔(i−C8H17O)2P(O
H)Oと(C18H35)NH2の反応生成物〕を挙げ
ることができる。
【0021】リン酸エステル系摩擦調整剤の添加割合は
、通常、0.01〜5重量%、好ましくは0.05〜2
重量%である。この添加割合の範囲内において、良好な
摩擦特性および摩耗防止特性が得られる。また、これら
の摩擦調整剤は、2種以上を併用することが、初期およ
び長期に良好な摩擦特性および摩耗防止特性を付与する
上で好ましい。
【0022】粘度指数向上剤 従来の鉱油系の油圧作動油においては、良好な粘度−温
度特性を得るために、粘度指数向上剤として、比較的高
分子量のポリメタクリレート(PMA)を添加していた
。これに対して、本発明で用いる基油は、それ自体が良
好な粘度−温度特性を示すため、重量平均分子量が2〜
20万、好ましくは2万以上10万未満、より好ましく
は3〜9万程度のPMAを粘度指数向上剤として添加す
ることにより、油圧作動油の粘度−温度特性を一層向上
させることができる。特に、重量平均分子量が10万未
満の比較的低分子量のPMAは、高分子量のPMAと比
較して剪断安定性に優れているため、本発明の油圧作動
油の粘度−温度特性および剪断安定性をともに向上させ
ることができる。これらの粘度指数向上剤の添加割合は
、通常、5〜30重量%、好ましくは10〜25重量%
である。
【0023】また、前記PMA系以外にも、PIB(ポ
リイソブチレン)系、EPC(エチレン−プロピレン共
重合体)系、SPC(スチレン−ブタジエン共重合体水
添物)系などの粘度指数向上剤を用いることができる。
【0024】その他の添加剤 本発明の自動車のサスペンション用油圧作動油には、前
記リン酸エステル系摩擦調整剤および粘度指数向上剤の
他に、本発明の目的を損なわない範囲内において、例え
ば、無灰分散剤、金属不活性化剤、酸化防止剤、消泡剤
、防錆剤、金属清浄剤などの汎用の潤滑油用添加剤を配
合することができる。
【0025】無灰分散剤は、リン酸エステル系摩擦調整
剤、油劣化物などを油中に分散させる目的で使用される
もので、例えば、コハク酸イミド系、コハク酸アミド系
、ベンジルアミン系、エステル系のものなどが挙げられ
る。これらの無灰分散剤は、通常、0.05〜1重量%
の割合で使用される。
【0026】金属不活性化剤は、油の酸化や熱劣化物に
よる金属の腐蝕防止、基油中への金属の溶出防止を目的
として使用されるもので、例えば、チアジアゾール系、
トリアゾール系などがあり、通常、0.01〜0.5重
量%の割合で使用される。
【0027】酸化防止剤としては、アミン系酸化防止剤
やフェノール系酸化防止剤など慣用のものが使用できる
。アミン系酸化防止剤としては、例えば、アルキル化ジ
フェニルアミン、フェニル−α−ナフチルアミン、アル
キル化−α−ナフチルアミンなどがあり、フェノール系
酸化防止剤としては、例えば、2,6−ジ−t−ブチル
フェノール、4,4′−メチレンビス(2,6−t−ブ
チルフェノール)などがあり、これらは、通常、0.0
5〜1重量%の割合で使用される。
【0028】その他の添加剤としては、ジメチルポリシ
ロキサン、ポリアクリレートなどの消泡剤、アルケニル
コハク酸またはその部分エステル、アルカノールアミン
などの防錆剤、油の酸化劣化物を中和化するためのCa
−スルフォネート、Mg−スルホネート、Ba−スルホ
ネート、Ca−フェネート、Ba−フェネートなどの金
属清浄剤などを所望に応じて適宜使用することができる
【0029】
【実施例】以下、本発明を実施例に基づいて更に詳しく
説明するが、本発明はこれらの実施例のものに限定され
るものではない。 [実施例1〜18、比較例1〜3] 表1ないし表4に示される基油成分と、各種添加剤成分
を混合して自動車のサスペンション用油圧作動油を調製
した。各成分の配合割合は、重量%で示されている。な
お、添加剤成分の重量%は、基油成分と添加剤成分との
合計量を基準としたものである。
【0030】表中の各成分は、次のとおりである。 PA01・・・・デセン−1オリゴマ−の水素添加物。
【0031】動粘度:100℃で、2.3cSt。 PA02・・・・デセン−1オリゴマ−の水素添加物。
【0032】動粘度:100℃で、1.7cSt。 ジエステル(DOA)・・・・ジ(2−エチルヘキシル
)アジペート。 動粘度:100℃で、2.3cSt。 ジエステル(DiDA)・・・・ジ(イソデシル)アジ
ペート 動粘度:100℃で、3.6cSt。 鉱油・・・・動粘度:100℃で、2.0cSt。 無灰分散剤・・・・アルケニルコハク酸ポリアルキレン
ポリイミド 酸化防止剤A・・・・(フェノール系)2,6−ジ−t
−ブチル−4−メチル−フェノール酸化防止剤B・・・
・(アミン系) ビス(p−オクチルフェニル)アミン 金属不活性化剤・・・・ベンゾトリアゾール系粘度指数
向上剤・・・・ポリメタクリレート(PMA)■重量平
均分子量3.5万、 ■重量平均分子量9万、 ■重量平均分子量10万以上。 摩擦調整剤(リン酸エステル)・・・・モノオレイルホ
スフェイトとジオレイル ホスフェイトとの混合物〔(C18H35O)P(OH
)2Oと (C18H35O)2P(OH)Oとの混合物〕摩擦調
整剤(亜リン酸エステル)・・・・ジオレイルハイドロ
ゲンホスファイト 〔(C18H35O)2P(OH)〕 摩擦調整剤(リン酸エステルアミン塩)・・・(i−C
8H17O)2P(OH)O と(C18H35)NH2の反応生成物
【0033】<
性能評価法> 動粘度・・・・・  ウベローデ粘度計を用い、JIS
  K−2283にしたがって、100℃で測定した。 単位は、cSt(=mm2/s) 粘度指数・・・・・  ウベローデ粘度計を用い、JI
S  K−2283にしたがって、40℃と100℃の
動粘度から算出した。数値の大きいほど粘度−温度特性
が良好であることを示す。 低温粘度・・・・・  ブルックフィールド粘度計を用
い、ASTM  D−2983にしたがって、−40℃
での粘度を測定した。 蒸発量・・・・・  油圧作動油を金属製容器に入れ、
真空ポンプで−20mmH2Oまで減圧し、100℃で
8時間加熱した後の蒸発量を測定し、加熱前の重量に対
する重量%を算出した。 剪断安定性・・・・・  油圧作動油をガラス製容器に
入れ、超音波10KHZを30分間照射し、試験後の粘
度変化率を測定した。 ニトリルゴムとの適合性・・・・・  ニトリルゴム試
験片を油圧作動油に120℃で所定の時間(70、14
0、280、560時間)浸漬し、ゴムの物性変化(体
積変化、硬さ変化、引張強さ変化、伸び変化)を測定し
た。測定結果を総合的に判断して、各物性の変化率の小
さなものを「適」とし、変化率の大きなものを「不適」
とした。性能評価の結果を表1ないし表4に示す。
【0034】
【表1】
【0035】
【表2】
【0036】
【表3】
【0037】
【表4】
【0038】
【発明の効果】本発明のオレフィンオリゴマーとジエス
テルとを含む混合油を基油とした自動車のサスペンショ
ン用油圧作動油は、粘度−温度特性に優れているととも
に、耐引火性、耐蒸発性、焼付防止性、剪断安定性など
に優れたものである。したがって、本発明の油圧作動油
は、自動車の姿勢制御に用いられる油圧装置に極めて好
適なものであり、長期にわたり優れた油圧応答性を発揮
することができる。

Claims (6)

    【特許請求の範囲】
  1. 【請求項1】  (a)オレフィンオリゴマー70〜9
    0重量%と、(b)炭素数4〜14の脂肪族二塩基酸と
    炭素数4〜14のアルコールとの縮合により得られるジ
    エステル10〜30重量%とを含む混合油を基油として
    含有することを特徴とする自動車のサスペンション用油
    圧作動油。
  2. 【請求項2】  前記基油、リン酸エステル系摩擦調整
    剤および粘度指数向上剤を含有する請求項1記載の油圧
    作動油。
  3. 【請求項3】  100℃での動粘度が2〜15センチ
    ストークス(cSt;mm2/s)で、かつ、−40℃
    での粘度が400〜2400ミリパスカルセカンド(m
    Pa・s)である請求項1または2記載の油圧作動油。
  4. 【請求項4】  粘度指数(VI)が200以上である
    請求項1ないし3のいずれか1項記載の油圧作動油。
  5. 【請求項5】  リン酸エステル系摩擦調整剤が、リン
    酸エステル、亜リン酸エステルおよびリン酸エステルア
    ミン塩よりなる群から選ばれる少なくとも1種である請
    求項2記載の油圧作動油。
  6. 【請求項6】  粘度指数向上剤が、重量平均分子量2
    万以上10万未満のポリメタクリレートである請求項2
    記載の油圧作動油。
JP3091399A 1990-03-31 1991-03-29 自動車のサスペンション用油圧作動油 Pending JPH04314794A (ja)

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JP8292790 1990-03-31
JP3-78683 1991-02-18
JP7868391 1991-02-18

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Publication Number Publication Date
JPH04314794A true JPH04314794A (ja) 1992-11-05

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ID=26419733

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WO2006129889A1 (ja) * 2005-06-03 2006-12-07 Nippon Oil Corporation 緩衝器用油圧作動油組成物
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JP2008133332A (ja) * 2006-11-27 2008-06-12 Idemitsu Kosan Co Ltd 自動車緩衝器用潤滑油組成物
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WO2016174973A1 (ja) * 2015-04-28 2016-11-03 Kyb株式会社 油圧ショックアブソーバ用作動油および油圧ショックアブソーバ
JP2020097925A (ja) * 2018-11-12 2020-06-25 プファイファー・ヴァキューム・ゲーエムベーハー 真空ポンプにおける合成オイルの使用、および真空ポンプ

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EP0453114A1 (en) 1991-10-23
DE69109927D1 (de) 1995-06-29
EP0453114B1 (en) 1995-05-24
DE69109927T2 (de) 1995-09-28

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